28 September 2023, Volume 51 Issue 18
    

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  • Cavitation Noise Suppression of 2D Valve by Valve Sleeve Slotting
    ZHAO Yonghua, RUAN Jian, TANG Puhong, YUE Yuhuan, ZHAO Yun
    Machine Tool & Hydraulics. 2023, 51(18): 1-8. https://doi.org/10.3969/j.issn.1001-3881.2023.18.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The pilot stage and the power stage are integrated in one spool by the 2D valve,which is easy to realize the fast work and high frequency response of the valve.It has the advantages of simple structure,stable performance and large power to weight ratio.The cavitation flow in the pilot stage of the 2D valve was analyzed by computational fluid dynamics.Taking the 2D valve pilot structure as the research object,Fluent software was used to compare the flow rate change,pressure distribution,gas volume fraction and other flow characteristics under different valve sleeve structures.The results show that the cavitation phenomenon is weakened after opening U-shaped grooves on both sides of the valve sleeve chute,which shows that the jet velocity on the analysis surface decreases and the gas volume fraction on the bottom surface of the chute decreases,indicating that the U-shaped grooves change the velocity streamline in the valve sleeve chute and weaken the shear flow effect of high-speed jet fluid.By further analyzing the noise spectrum of monitoring points in the valve sleeve chute,it is found that the noise of the two sides of the valve sleeve chute is reduced by 10 dB in the back of the chute where the cavitation is most serious compared with the original structure;at the exit of the model,the noise is reduced by 3 dB;in the middle of the chute,the noise sound pressure level increases slightly.It shows that the U-shaped groove with a width to depth ratio of 2.2 on both sides of the valve sleeve chute can indeed reduce the noise caused by cavitation in the 2D valve pilot stage.
  • Dynamic Error Measurement of Five-Axis Machine Tool Based on Characteristic Workpiece Machining
    JIANG Xiaogeng, GAO Duan, YANG Xiao, MENG Xiangdong, WANG Hao
    Machine Tool & Hydraulics. 2023, 51(18): 9-17. https://doi.org/10.3969/j.issn.1001-3881.2023.18.002
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    The five-axis machine tool has an extremely important position in modern industrial production.The complexity of the parts makes the machine tool produce various errors during processing,among which the dynamic error becomes an inevitable part.The causes of dynamic error were expounded,and the factors affecting dynamic error in the machining process were analyzed.In order to measure the dynamic error of the machine tool quickly and accurately,the characteristic workpiece was designed and processed,and finally it was processed on the DMU80T five-axis CNC machine tool,and the dynamic error was calculated by on-machine measurement and coordinate measuring machine measurement.The workpiece with surface features was machined,and the Chebyshev polynomial was used to pre-fit various errors during surface machining,and the equations about the each error term coefficient were obtained,and finally the expression of the error was obtained.Using this method,the dynamic error of the surface machining coupling can be directly separated.Finally,the dynamic errors of the two specimens were compared.The results show that in the process of high-speed surface machining,the dynamic error is the main part of the surface machining error,which is greater than the dynamic error in straight line machining.
  • Research on Bolt Distribution Based on Spring Stiffness Method
    NIE Xingyue, SHI Lei, WANG Jiangang, FENG Ding, SHAO Xue, YANG Jianghuai
    Machine Tool & Hydraulics. 2023, 51(18): 18-25. https://doi.org/10.3969/j.issn.1001-3881.2023.18.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Uneven load distribution of bolt group is one of the important reasons for vibration and even damage of large equipment.In engineering,the bolt joint points are often subjected to complex time-varying low-speed heavy loads,and the bolt group is easy to break due to uneven load distribution,which affects the stability of equipment operation.In order to study the stress of the bolt group under different bolt distribution,the mechanical model of multi-bolt connection was established to analyze the bolt load distribution.On this basis,a load calculation method of multi-bolt connection was proposed considering the complex structure of the connection.Experimental study and finite element analysis were designed and carried out,and the accuracy of the calculation method was verified by comparing the results.Based on the proposed theoretical calculation method,the distribution law of bolt shear stress under load was given,and the shear stress distribution characteristics of uniform distribution model and non-uniform distribution model of bolts were compared.It is found that the uniformity of load distribution of non-uniform bolt distribution is better than that of uniform bolt distribution.
  • Parameter Optimization Analysis for Resilient Wheel During Tread Braking Based on Orthogonal Method
    ZHU Yilun, ZHOU Xin, SHENG Xiaozhen, ZHONG Shuoqiao
    Machine Tool & Hydraulics. 2023, 51(18): 26-32. https://doi.org/10.3969/j.issn.1001-3881.2023.18.004
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    Resilient wheels are widely used in urban tram systems in China due to the wheels' good performance on vibration and noise reduction.Application of resilient wheels to subway vehicles is also underway.Aiming at the problem of temperature and stress of a subway resilient wheel generated by tread braking,a mechanical-thermal finite element model was established and it was used to calculate the temperature of the rubber layer and the internal surface stress of the rim,and compared with the laboratory braking thermal test data.Comparing the elastic wheel stress distribution considering only mechanical load and mechanical-thermal coupling,it was found that the braking thermal stress had great influence on the rim stress.The orthogonal design method was used to study the effect of the rim thickness,the rubber layer angle and the elastic modulus of the rubber layer on the maximum temperature of the rubber layer and the internal surface stress of the rim in different line situations.The results show that increasing the thickness of the rim reduces the rubber temperature and the mechanical-thermal coupling stress;when the thickness of the rim is less than 55 mm,the mechanical stress dominates,and when the thickness of the rim is greater than 60 mm,the temperature stress dominates;the effect of the elastic modulus of the rubber layer is non-monotonic,for a given rim thickness and a rubber layer angle,there exists optimal value.
  • A Method for Point Cloud Reduction of Casting Automatic Grinding
    ZHU Bin, CHEN Xindu, WU Lei, LIU Yuesheng, DIAO Shipu
    Machine Tool & Hydraulics. 2023, 51(18): 33-37. https://doi.org/10.3969/j.issn.1001-3881.2023.18.005
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    Due to the problem of redundant point cloud data in the automatic grinding operation of castings,the data processing time is too long and the processing efficiency is affected.In order to improve the computational efficiency in point cloud processing,a point cloud reduction method was proposed based on linear coupled curvature to combine efficiency and accuracy.A K-d tree data structure was constructed for the source scan point cloud,and a more robust linear coupled curvature feature model was proposed to extract feature domain.On this basis,the improved spatial dichotomy method was used to quickly simplify the non-feature domain.After fusing the feature domain and the simplified non-feature domain,the final simplified result was obtained.The results show that the method can obtain accurate reduction ratio,and there are only small data holes in the fitted surface model.Under the condition of 90% reduction ratio and 2.7% noise ratio,the conformal error is 0.867 mm,which is better than the traditional point cloud reduction method,and can realize the efficient reduction of casting point cloud.
  • Posture Control of Hydraulic Proportional Drive Robot Arm Based on Inclination Sensor
    GAO Bo, LI Fakang
    Machine Tool & Hydraulics. 2023, 51(18): 38-44. https://doi.org/10.3969/j.issn.1001-3881.2023.18.006
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    The optimal slurry spraying process of the slurry spraying robot requires the gun of the slurry spraying robot to be controlled with respect to the position and attitude of the roadway.The joint angle was obtained by solving for the position of the gun in horizontal or vertical motion relative to the base,and the joint angle was measured in real time using an inclination sensor,a closed-loop position was formed based on the solved angle and the measured angle to drive the joint to complete the spraying action.The simulation model of the joint position closed-loop control system based on the inclination sensor and load-sensitive proportional valve control hydraulic system was established by using MATLAB/Simulink,and the delay caused by the dead zone of the proportional valve was eliminated by using the voltage step compensation method,and the influence of the pure hysteresis link on the control system was eliminated by using the improved Smith predictor,the rationality and feasibility of the method was verified finally.
  • Structural Optimization Study of Linear Plunger Type Balanced Control Valve
    YU Zhengchang, GUO Jianxiang, ZHANG Long, SUN Jinfei, LIU Zhanjie
    Machine Tool & Hydraulics. 2023, 51(18): 45-51. https://doi.org/10.3969/j.issn.1001-3881.2023.18.007
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    In order to solve the problem that the flow characteristics of the plunger type balanced control valve designed by relying on empirical equations deviate from the expected linear type,a scheme to optimize the linear plunger type control valve spool structure was proposed.The flow coefficient and the flow coefficient increment were taken as the criteria for evaluating the linearity fit,taking the experimental test as the premise and the numerical simulation as the main means,the spool structure was adjusted and optimized section by section,and the reasonableness and accuracy of the scheme through numerical simulation were verified.The results show that the optimized spool structure makes the flow characteristics fit linearly,and the deviation of the flow coefficient at each opening degree from the theoretical value of 8% or more before optimization is reduced to less than 2%;the deviation of the flow coefficient increment at each opening degree from the theoretical value of 15% or more before optimization,with the maximum value of 63.26%,is reduced to less than 5%,with the maximum value of only 13.62%.
  • Mechanical Characteristic Analysis of Ultra-high Pressure Hydraulic Jacking Apparatus Based on FEM
    ZHAO Yinghui, CHEN Xuelin, LIU Anmin
    Machine Tool & Hydraulics. 2023, 51(18): 52-60,66. https://doi.org/10.3969/j.issn.1001-3881.2023.18.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Mechanical characteristics of the component in ultra-high pressure hydraulic jacking system are the main factor that affects its performance,which are the key challenges in UHP technology.The FEM was used to research the change rules of the hydraulic system stiffness,modal,natural frequency,displacement and stress under different material,diameter and thickness of each component in ultra-high pressure hydraulic jacking systems.The finite element calculation results are relatively close to the pressure test results,which verified the effectiveness of the finite element model and boundary conditions.The results show that the hydraulic spring stiffness is increased with the increase of inner diameter of cylinder,but decreased with the increase of amplitude,the effect is decreased with the increase of inner diameter;the system natural frequencies before the 3rd are increased with the increase of ground strength;the threshold stress in Bonded conditions is minimum,but it is maximum in Frictional condition,ultimate stress is decreased with the increase of ground stress;the maximum displacement is increased with the increase of frictional coefficient,the maximum stress is increased with the increase of ground strength on the C20 ground;the maximum displacement first increases and then decreases with the increase of frictional coefficient on the C30 ground,the critical frictional coefficient values on displacement and stress are 0.43,0.59 respectively;the ultimate displacement is significantly reduced by structural steel surface;the ultimate difference of displacement increases with the ground stress in the same length of hydraulic cylinder of different side;the ultimate stress of hydraulic cylinder bottom increases with the increase of ground stress,the displacement of hydraulic cylinder in sideⅡis larger than sideⅠ,the ultimate displacement is closer to the top,and the extreme value is alternating.The study investigates the stress and strain of hydraulic jacking apparatus under ultra-high pressure,providing references on design of its structure,seal and applications.
  • Application Research of Hydraulic Servo Pulsation Calibration Device for Anti-vibration Pressure Gauge
    LIU Kaixu, LIU Zhuoqun, LI Bo, DONG Peng, WU Chunmei, ZHANG Zhansheng
    Machine Tool & Hydraulics. 2023, 51(18): 61-66. https://doi.org/10.3969/j.issn.1001-3881.2023.18.009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    When performing SY/T 6817-2010 Calibration method of anti-vibration pressure gauge to calibrate anti-vibration pressure gauges,it is necessary to apply sine wave pulsation pressure at a test point between 30% and 40% of the measuring range,its amplitude is not more than 10% of the pressure value at this point,and the pulsation frequency is (60±5)times per minute.In order to obtain such a pulsating pressure source,the reference value of the inspection point was generated by the pre-pressure of the air-driven liquid pump,and the high-pressure value with a 10% increase was generated by using the liquid-driven liquid booster cylinder,and then the reciprocating motion of the booster cylinder piston controlled by the servo hydraulic pressure produced sinusoidal pulsations with fluctuation range between the reference value and the high pressure value.The developed calibration device is convenient to set pulsation frequency and amplitude,and the influence of environmental parameters is little.It is controlled by the acquisition card of the industrial computer,with a clear display interface and high control accuracy,which is suitable for calibration anti-vibration pressure gauge in test room and verification room.
  • Research on the Application of Apriori Algorithm and Neural Network in CNC Machine Tools
    GUO Jun, WANG Ying, LI Zhuo, DENG Guoqun
    Machine Tool & Hydraulics. 2023, 51(18): 67-73. https://doi.org/10.3969/j.issn.1001-3881.2023.18.010
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    The machining accuracy of CNC machine tool is affected by machine tool parts,external environment and other factors,so it is necessary to add appropriate compensation parameters to ensure the stability of machining accuracy.In addition,the compensation parameters of different lathes at different times change in real time.Therefore,an intelligent error compensation model was proposed based on association rules and neural network method.Based on the dataset produced in actual production,the dataset was screened by Apriori algorithm;each eigenvalue and compensation parameter were normalized to improve the convergence speed of the data;the neural network model was used to search for the best compensation parameter model for lathes in different situations,so as to construct the best intelligent error compensation model;after intelligent error compensation,the produced objects were recognized with image to analyze whether they met the accuracy requirements.The simulation test results show that the lathe stability is improved by 0.695 and 0.713 for the training dataset and the test dataset respectively.The measured results show that 30 products are carved with the above method,and the accuracy meets the requirements.Therefore,the intelligent error compensation model can improve the stability of lathe processing and the product qualification rate.
  • Error Modeling and Compensation Analysis of Aspheric Grinder Based on Hidden Markov Model
    LIU Shunan, YANG Liu
    Machine Tool & Hydraulics. 2023, 51(18): 74-77. https://doi.org/10.3969/j.issn.1001-3881.2023.18.011
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    To solve the ring-shaped corrugation error problem existing in the machining of aspherical optical components,the basic principle of CNC tangential rotary forming aspherical machining was explained,the mathematical modeling process of the application of the velocity interpolation principle was analyzed.Due to the time-based nature of the feed,a scheme of constructing a for ward-looking prediction model for speed was proposed combining the hidden Markov model,and a hidden Markov compensation model was constructed based on the actual aspherical processing samples.The experimental results show that the speed forward-looking compensation technique based on hidden Markov model can effectively realize the speed compensation in the speed interpolation,the speed error residual can be reduced to 0.949 8 after compensation,which meets the machining accuracy requirements of the aspheric CNC grinding machine.
  • Design and Research on Electronic Control System of Intelligent Hydraulic Extubating Machine
    ZHANG Baoquan, XIANG Yong, XIN Zuqiang, PENG Jiashu, YU Zuyao
    Machine Tool & Hydraulics. 2023, 51(18): 78-83. https://doi.org/10.3969/j.issn.1001-3881.2023.18.012
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    Focusing on the replacement problem of heat tracing pipes in current oil pipeline,an intelligent hydraulic extubating machine satisfying the work needs of the oil industry was proposed.The composition and working principle of the hydraulic electronic control system were expounded,and the control logic of the electric control system was illustrated.The extubating machine adopted a complete set of explosion-proof devices,which could be safely applied to the high-risk environment of oil and gas mixing.Though designing an adaptive differential switching system,it could satisfy the adaptive switching between high load and high speed.It had the function of HMI model,which was convenient for real-time control and monitoring of the working state of the extubating machine.The experiment shows that the extubating machine has high working efficiency,strong reliability and high safety.
  • Intelligent Process Design Based on Parametric Process Template
    HUANG Lijiang, LI Yunpeng, GONG Siming, LIN Hai, WANG Liang
    Machine Tool & Hydraulics. 2023, 51(18): 84-89. https://doi.org/10.3969/j.issn.1001-3881.2023.18.013
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    Intelligent process design is the key and foundation of intelligent manufacturing technology.In order to improve the efficiency of process design,an intelligent process design method based on parametric process template was proposed.The basic idea was to use parametric method to express the variable information in the process template through parameters,and the parametric relationship between process information,process parameters and part parameters was established by means of parameter expression and fusion rules,so as to realize process intelligent design based on parameter driving.The expression of process,parameters and rules in the parametric process template method was focused on,and the process reasoning process based on the parametric process template was discussed in detail.Finally,taking the spinning process design of cylindrical parts as an example,the intelligent process design was verified.It is shown that this method is easy to realize and efficient.
  • Research on Soft Actuator Based on Bellows Structure
    CHEN Jianhao, LI Yanbin, LIU Yuwang
    Machine Tool & Hydraulics. 2023, 51(18): 90-95. https://doi.org/10.3969/j.issn.1001-3881.2023.18.014
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    Soft robot mainly uses soft actuators to achieve the required movement.Therefore,the research of soft actuator plays a vital role in the development of soft robot.Based on the bellows structure,a soft actuator with good motion performance was manufactured by 3D printing,and the influence of its main structural parameters on the motion performance of the soft actuator was analyzed by finite element analysis software.Finally,the motion performance of the soft actuator was tested by the experimental platform.The experimental results show that the elongation of the soft actuator can reach 60 mm and the bending angle can reach 75°,which proves that the designed soft actuator has good motion performance.
  • Innovative Design of Multi-dimensional Vibration Aging Exciter Based on TRIZ Theory
    WANG Chengjun, LIU Qing
    Machine Tool & Hydraulics. 2023, 51(18): 96-101. https://doi.org/10.3969/j.issn.1001-3881.2023.18.015
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    Aiming at the problem of insufficient adaptability of the vibration excitation device during the vibration aging treatment of large steel structures,the current inertial vibration excitation device was analyzed,and a multi-dimensional vibration aging vibration exciter was designed.TRIZ theory system function analysis and causal axis analysis were used to determine the reasons for the lack of adaptability of inertial vibration excitation devices,and solutions to the insufficient adaptability problem of inertial vibration excitation devices were obtained by adopting the technical contradiction solving principle,physical contradiction solving principle,and the matter-field model method.The structural design of the multi-dimensional vibration aging exciter was completed,and modal analysis on the key components of the main support was carried out.The design feasibility of the multi-dimensional vibration aging exciter was verified.The results show that the multi-dimensional vibration aging exciter has the advantages of strong adaptability,high excitation frequency,multi-dimensional vibration,etc.,which improves the efficiency and automation of vibration aging treatment,and meets the actual work needs of multi-dimensional vibration aging treatment.
  • Optimization Design of Sheet Metal Bending Sequence Based on DWOA
    ZHAO Yuntao, DONG Yifan, LI Weigang
    Machine Tool & Hydraulics. 2023, 51(18): 102-107. https://doi.org/10.3969/j.issn.1001-3881.2023.18.016
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    In the whole process of bending workpiece,the number of turns and flips,the distance of each working step and the selection of the mold will affect the efficiency of the sheet metal bending sequence.Therefore,an improved whale optimization algorithm was used to optimize the design of the bending sequence.The classical whale optimization algorithm was improved,the individual whale and the hunting method were redefined,and the local search operation was introduced to enhance the feasibility of the solution,so as to reduce the probability of falling into the local optimal solution.Finally,it was applied to the bending sequence problem,and was analyzed and compared with the known related algorithms.The experimental results show that the improved discrete whale optimization algorithm (DWOA)is used to calculate the bending sequence problem,and the optimal bending sequence plan that meets the requirements is obtained.The solution quality is higher than the comparison algorithms,and the discrete whale algorithm has better global optimization ability and faster convergence characteristics in finding the best sequence plan.
  • Design of Digital Twin System for Welding Equipment Workshop
    WANG Guan, LIU Chang, SONG Wei, ZHANG Le
    Machine Tool & Hydraulics. 2023, 51(18): 108-114. https://doi.org/10.3969/j.issn.1001-3881.2023.18.017
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    Manual assembly is the main method of production in assembly workshop of oil and gas pipeline welding equipment.In order to solve the problems of poor real-time management and low degree of informatization in the workshop,combining digital twin technology and lean manufacturing theory,a digital twin system was designed to improve the degree of intelligent management and control.The overall architecture and functional modules of the system were proposed;the product digital twin and digital twin workshop were constructed,and a management and control method to reduce the influence of uncertain factors was proposed;the working principle of each function was expounded;finally,the operation reliability of the system was verified by taking a certain part of the automatic welding equipment as an example.The experiment results show that the proposed scheme has a significant effect on improving the production efficiency of the welding equipment workshop and realizing the lean production method.
  • Monitoring System for Automatic Spraying Workshop of Segmented Hull Based on Digital Twin
    WANG Shuai, XU Jiangmin
    Machine Tool & Hydraulics. 2023, 51(18): 115-121. https://doi.org/10.3969/j.issn.1001-3881.2023.18.018
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    In view of the large amount of toxic gases and solid particles produced during the spraying operation in the automatic spraying workshop of large segmented hull,it is difficult to monitor the real-time spraying,and the problem of the poor film-forming quality caused by the mismatch between the actual spraying data and the performance of the process system,the intelligent monitoring method based on digital twin technology was proposed.The system architecture of digital twin 5D model and twin model were established,the model data-driven technology were used,and the new digital twin modeling method for spraying film thickness was emphatically proposed.Through experiments and simulation comparison,the digital twin system can highly restore the spraying film thickness and its uniformity.Combined with the characteristics of cyclic iteration of spraying process,through accumulating and processing field data,the system can iteratively optimize the spraying process parameters before,during and after processing,so as to improve the spraying efficiency and spraying quality.
  • Design and Experimental Study of Pressure Balanced Pneumatic Proportional Valve
    GUO Dayong, SI Guolei, TANG Bing
    Machine Tool & Hydraulics. 2023, 51(18): 122-128. https://doi.org/10.3969/j.issn.1001-3881.2023.18.019
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    The difference between proportional valves and solenoid valves is that proportional valves can achieve continuous flow regulation,so their design methods are also different.The structure of the self-developed pneumatic proportional valve was introduced,its working principle was summarized,a detailed introduction to the structural dimensions of the dynamic valve core and the design method of the coil components was provided.The valve core was balanced by adding a sealing diaphragm,so that the valve core was only subjected to electromagnetic and spring forces during movement,making it easier to achieve dynamic balance and reduce the power consumption of the electromagnet.In order to improve the horizontal characteristics of the output electromagnetic force,parameterized simulation research was conducted on the magnetic isolation ring,and the optimal parameters of the magnetic isolation ring were ultimately determined θ2=60°,Δh=0.2 mm,θ1=90°,h=1 mm.The spring force range was determined based on dynamic balance,and the reset spring parameters were determined using Inventor software.Finally,the flow characteristics of the pneumatic proportional valve were tested.The test results show that the output flow of the pneumatic valve can continuously change with the control voltage,meeting the basic performance of the proportional valve.
  • Design of Brazing Temperature Control System for PDC Drill Based on STM32
    SHEN Fang, CHEN Xuehai, YANG Guangyou
    Machine Tool & Hydraulics. 2023, 51(18): 129-132,161. https://doi.org/10.3969/j.issn.1001-3881.2023.18.020
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    At present,the complicated PDC bit still adopts artificial flame brazing,and the welding quality is not stable enough.Aiming at the problem,a temperature control system was designed based on the double-loop PID structure combining with the brazing process of the PDC bit.Taking PID control algorithm and hierarchical control idea as the core,multi-task software was designed based on embedded real-time operating system RT-Thread,and real-time measurement,precise control and display of brazing temperature were realized.The experimental results show that the system can well meet the brazing temperature requirements of PDC bits.
  • Study on Bidirectional Hydraulic Lock in Pure Water
    ZHOU Xinjian, LU Yongfeng, LIU Siyu, TIAN Yan
    Machine Tool & Hydraulics. 2023, 51(18): 133-138. https://doi.org/10.3969/j.issn.1001-3881.2023.18.021
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    In order to develop a bidirectional hydraulic lock suitable for pure water medium,aiming at the cavitation damage caused by pure water medium,three structural improvement schemes were designed from the perspective of flow field control,and CFD technology was used to simulate the cavitation phenomenon of each valve channel under different valve opening conditions,so as to obtain the performance level of various valve channels in suppressing cavitation.In order to ensure the reliability of the study,a bidirectional hydraulic lock experimental platform for pure water medium was built for experimental verification.The research results show that the optimization design of valve port structure has obvious effect on suppressing cavitation.Among them,the improvement scheme 1 has the best cavitation prevention ability among the four valve channel structures.The cavitation prevention level is about 50% higher than that of the traditional valve channel structure,which greatly suppresses the cavitation phenomenon and reduces the cavitation damage of the bidirectional hydraulic lock.
  • Design and Research of Mobile Operating Platform Based on Active Suspension
    YAN Shuangqiao, DONG Qifeng, CHENG Maolin, YANG Xiuli, MENG Linyuan
    Machine Tool & Hydraulics. 2023, 51(18): 139-145. https://doi.org/10.3969/j.issn.1001-3881.2023.18.022
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    Aiming at the complex engineering environment and diverse terrain conditions,a mobile operating platform based on active suspension was designed.The structure of the operating platform was designed,and the finite element structure statics analysis of the hydraulic actuated leg was carried out to verify the reliability of the mechanical structure of the actuated leg.The finite element structure dynamics analysis of the whole operating platform was carried out,and the frequency segment of the excitation source which could avoid resonance of the platform was obtained.According to the characteristics of the operating platform,the leveling algorithm of "center point not moving" was adopted,and the control of the platform angle was equivalent to the control of the displacement of the hydraulic actuating leg through the mathematical model.The electro-hydraulic proportional control system of the operating platform was designed,and the effectiveness of PID control algorithm was verified by simulation.The overall performance of the operation platform was verified through tests.The results show that the mobile operation platform based on active suspension meets the design requirements,achieves the expected goals.
  • Data Acquisition and Monitoring System of Extrusion Production Line Based on OPC UA
    WANG Xiaoyou, LIAO Yinghua, WANG Hua, ZHANG Yuhang
    Machine Tool & Hydraulics. 2023, 51(18): 146-151. https://doi.org/10.3969/j.issn.1001-3881.2023.18.023
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    Aiming at the difficulties brought by the diversity of equipment types in traditional extrusion workshops to factory data acquisition and unified monitoring,a data acquisition and monitoring system based on OPC UA was studied.Taking the extrusion production line as the research object,through the analysis of the system functional requirements,the overall technical framework was designed.The production data were classified and organized to establish a server address space information model,and KEPServerEX was used to build a local OPC UA server to realize real-time collection and packaging of production data of different equipment.Using the SDK provided by the OPC UA foundation,the OPC UA client was developed to connect with the OPC UA server,completing the unified collection and processing of the server address space information nodes,and the data were uploaded to the database to provide data support for the upper-level business system.Finally,based on.NET platform,the centralized monitoring system of extrusion production line was developed using C# language.The application results show that the system can effectively reduce the underlying data redundancy and enhance the interconnection performance between underlying devices,and the multi-source heterogeneous data format and device communication are unified.
  • Design of Industrial Robot Language Editor Based on Qt
    PENG Ling, ZHU Runze, DAI Kunlin, LI Hanchao, ZOU Qing, SHEN Shuli
    Machine Tool & Hydraulics. 2023, 51(18): 152-156. https://doi.org/10.3969/j.issn.1001-3881.2023.18.024
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    Industrial robot language is an important part of the robot control system and is a window for users interacted with robot.Aiming at the problems that expanding hard and program editing operation is not efficient for existing industrial robot language editor,a design scheme for industrial robot language editor was proposed based on Qt.This editor provided loading,creating,copying,selecting of robot operating procedures and editing,copying,pasting,deleting of instruction lines.In addition,in order to take into account of the safety of robot operation,parameter range check and logic check of robot instructions were added.These functions were integrated in the teach pendant "program" menu module.It is verified that the proposed robot language editor has good portability and expansibility by the way of testing on real machine.
  • Design and Realization of Auxiliary Fuel Tank Transfer Simulation System for Civil Aircraft
    QU Yuanyuan, LI Zhiping, FANG Bin, CHEN Xi
    Machine Tool & Hydraulics. 2023, 51(18): 157-161. https://doi.org/10.3969/j.issn.1001-3881.2023.18.025
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    In view of the increasingly strong demand for civil aircraft auxiliary fuel tank,in order to support its experimental research,a detailed transfer simulation system test bench design scheme was put forward from the aspects of composition,principle,mechanical structure design,and control system design,and the test verification was carried out.The results show that the test bench is fast and accurate in bracket angle control,fuel tank pressure control,and transfer flow control,and all the indicators are superior,which can provide strong technical support for the development of civil aircraft auxiliary fuel tank system.
  • Design of Matrix Intelligent Production Line for Customized Machining of Engine Parts
    ZHAO Guoqiang, HUANG Yonghua, HAN Qifei, WU Yingying, ZHANG Yixin, ZHANG Jian
    Machine Tool & Hydraulics. 2023, 51(18): 162-167. https://doi.org/10.3969/j.issn.1001-3881.2023.18.026
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    A matrix intelligent production line layout was proposed to meet the personalized customization machining requirements of engine parts for manufacturing enterprises.The development focusing on the functional analysis,overall scheme design,simulation and verification etc.of the production line was carried out.And intelligent production scheduling,machining,detection,assembly and warehousing were realized by integrating industrial internet,intelligent control,industrial robot,MES system and other advanced technologies.The site layout optimization and virtual debugging of the designed production line were carried out by the process simulation method.And the production line was built and successfully debugged according to the above simulation results.It is proved by practice that the intelligent production line is reasonable in design and stable in operation.So the expected design requirements with the production line can be met.And the whole process intelligent production for engine parts can be realized.
  • Design on the Multi-parameter RFID Sensors for the Complex Machine Tool Workshop Environments
    WEI Shengkun, ZHANG Yuanhui
    Machine Tool & Hydraulics. 2023, 51(18): 168-172. https://doi.org/10.3969/j.issn.1001-3881.2023.18.027
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A multi-parameter RFID sensor was designed for the safety monitoring of machine tool structure in complex machine tool workshop environment.The multi-parameter RFID sensor mainly includes a coding and marking function module,a humidity detection module and a strain detection module.The three functional modules work independently to jointly realize the safety monitoring of the machine tool metal structure in the complex machine tool workshop environment.It is verified by experiments that the coding and marking function module has the functions of precise positioning and marking classification;the working frequency change of the rectangular microstrip antenna of the strain detection module has a linear relationship with the degree of strain,which can complete the stress change monitoring of the machine tool structure;the humidity detection module conforms to the theoretical derivation and simulation results,and as the humidity increases,the working frequency of the PVA sensor decreases faster,which can monitor the humidity changes in the complex machine tool workshop environment.
  • Design of Control System for High Speed Railway Ratchet Flexible Production Line Based on On-line Detection
    ZHUANG Yuanchang
    Machine Tool & Hydraulics. 2023, 51(18): 173-177. https://doi.org/10.3969/j.issn.1001-3881.2023.18.028
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    In view of the problems existing in the traditional processing technology of the core component ratchet of high-speed railway catenary,such as secondary clamping,difficult to ensure the processing accuracy,low production efficiency,full inspection of key dimensions and poor traceability of results,the robot fixture and automatic CNC turnover fixture were designed,and OMP60 probe and tool detection were used to realize on-line dimension detection.The FOCAS function library of FANUC system was used to collect the measurement data of the CNC,and Ethernet IP bus flexible scheduling robot was used to realize automatic loading and unloading,and a set of automatic production line control system for ratchet on-line detection was completed.The automatic processing,one clamping,full inspection of key dimensions and traceability of measurement results of ratchet production are realized,and the production efficiency and yield are significantly improved.
  • Hydraulic System Design for Automated Drill Pipe Transportation Equipment
    SHEN Sheng, YU Yikun
    Machine Tool & Hydraulics. 2023, 51(18): 178-182. https://doi.org/10.3969/j.issn.1001-3881.2023.18.029
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Frequent loading and unloading drill pipe will lead high labor intensity and potential safety hazard for the workers when drilling in coal mine underground.In order to solve this problem,a high-accuracy electro-hydraulic proportional control hydraulic system was designed with high explosion-proof degree according to mechanical structure and required function of the automated drill pipe transportation equipment.The power,control elements and hydraulic principle of the hydraulic system were defined by calculating the pressure and flow of each actuator according to its load,speed and action requirements in the equipment.In order to test the hydraulic system,a hydraulic system prototype of the automated drill pipe transportation equipment was made according to the hydraulic principle diagram.The experiment result shows that the prototype can transfer the drill pipes from silo of the transportation equipment to the case of the drilling machine and meets the work needs of drill pipe transportation equipment.
  • Reliability Evaluation of Spherical Valve Pair in Axial Piston Pump
    ZHANG Xiangyu, XU Shunhai, WANG Shaoping, GENG Yixuan, SHI Jian, BAI Linying
    Machine Tool & Hydraulics. 2023, 51(18): 183-191. https://doi.org/10.3969/j.issn.1001-3881.2023.18.030
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The spherical distribution pair has compact structure,large bearing area and strong anti-overturning moment capability.It is one of the commonly used structures of high-pressure and large-flow plunger pumps.Therefore,a reliability evaluation method for fatigue cracking and wear degradation of spherical distribution pair with a certain inclination angle of the plunger was proposed.The distribution model of the spherical distribution pair oil film was established,and the pressure expressions of the inner and outer sealing belts were obtained to realize the force analysis of the distribution pair.Through the ANSYS simulation model of the spherical distribution pair and analyzing the weak links of the cylinder,the fatigue reliability analysis of the cylinder was carried out based on the Miner criterion.The wear reliability of the spherical valve pair was calculated based on the inverse Gaussian theory.Finally,the fatigue reliability and wear reliability were combined to study the overall reliability.The research results show that the weakest link of the spherical distribution pair of the axial piston pump with inclined piston is the sharp corner at the junction of the high and low pressure chambers.Under the given stress and pressure conditions,when the survival rate is 50%,the minimum cycles number of equipment is 4.839×109 times,and the cylinder life is 31 839.52 h.The magnitude order of the overall stress cycles is consistent with the lower cycle counts magnitude order of fatigue and wear reliability,and thus reduces overall reliability when considering multiple reliability combinations.
  • Research on Vibration Suppression of Slider Type Spherical Rotor Pump
    LI Shilin, BAI Guochang
    Machine Tool & Hydraulics. 2023, 51(18): 192-196. https://doi.org/10.3969/j.issn.1001-3881.2023.18.031
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The slider-type spherical rotor pump has the characteristics of simple structure,no dead point and double displacement per week.It is suitable for ultra-miniature hydraulic pumps,but the reciprocating motion and flow pulsation of the rotating disc will cause increased vibration.The spherical pump was modeled dynamically,and the inertia moment of the piston and the gyroscopic moment generated by the movement of the rotating disk were obtained.It can be seen from the moment curves that the overall moment depends on the gyro moment.The volume equation of the spherical pump was established,and the flow curves were obtained by interpolation method.The multi-pump synthesis vibration reduction measures were used to offset the gyro torque and flow pulsation and reduce vibration.The vibration of the whole machine under the action of torque was simulated by ADAMS-Vibration,and the flow curve of the multi-pump was simulated by MATLAB.The vibration amplitude and flow pulsation of the multi-pump are greatly reduced,which proves the effectiveness of the vibration reduction measures.
  • Study on the Characteristics of Complex Corrosion Defects on Pipeline Damage and Failure
    ZHAO Xinbo, YI Xianzhong, YI Jun, WAN Jifang, CHEN Hui, YIN Guangpin
    Machine Tool & Hydraulics. 2023, 51(18): 197-204. https://doi.org/10.3969/j.issn.1001-3881.2023.18.032
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Corrosion is an important factor that endangers pipeline performance and affects transportation safety.The finite element software was used to establish complex rectangular and circular corrosion defect pipeline models,and the model was verified by full-scale blasting test data.The effects of length ratio,width ratio and depth ratio of complex rectangular corrosion defects and radius and depth of complex circular corrosion defects on pipeline failure behavior were analyzed.Based on the numerical analysis results,the pipeline integrity was comprehensively evaluated.The results show that the model error is 4.2% to 4.6%,which is lower than the experimental error;the stress of the two types of complex corrosion defects is symmetrically distributed,and the circumferential stress is greater than the axial stress;the depth ratio of complex rectangular corrosion defects has the greatest influence on the failure pressure,and the width ratio is the smallest;when the length ratio reaches 0.5,the pipeline failure pressure is stable at 9.5 MPa;the shallow corrosion depth of complex circular corrosion defects has more obvious influence on pipeline performance;the axial force has little effect on the failure pressure of the pipeline.
  • Simulation Analysis of Dynamic Characteristics of Automatic Drilling Rig Feed Position Servo System
    PENG Guangyu
    Machine Tool & Hydraulics. 2023, 51(18): 205-209. https://doi.org/10.3969/j.issn.1001-3881.2023.18.033
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In view of the low control accuracy of the feeding position of the automatic drilling rig,which affects the success rate of automatic make-up and unloading,and then affects the automatic construction smoothness of the automatic drilling rig,the dynamic simulation model of automatic drilling rig feed position servo system was established by AMESim,the parameter setting method of the model was introduced in detail,and the correctness of the model was verified by the simulation results.Then,the control variable method was used to simulate and analyze the influence of various components and parameters on the dynamic error of the feed position servo system,and according to the simulation results,comprehensive cost and implementation feasibility,the hydraulic and electronic control design parameters of the servo system were optimized to improve the control accuracy of automatic drilling rig feed position.Finally,a field test was carried out in Shigetai coal mine of Shendong Coal Group.The results show that the optimized automatic drilling rig's automatic make-up and unloading success rate increase from 92% to 98%,which greatly improves the automatic drilling rig's automatic construction smoothness.
  • Modeling and Analysis of Single-Roller Enveloping End Face Worm Transmission Efficiency
    WU Hongdong
    Machine Tool & Hydraulics. 2023, 51(18): 210-214,220. https://doi.org/10.3969/j.issn.1001-3881.2023.18.034
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To explore the transmission efficiency of single-roller enveloping face worm drive,taking transmission efficiency as research subject,the mathematical model of the transmission pair was established based on the meshing theory of single-roller enveloping face worm drive.The instantaneous transmission efficiency and average transmission efficiency of the transmission pair were calculated.The influence of the main parameters of the transmission pair on the average transmission efficiency of the transmission pair was analyzed.Using MATLAB for optimization calculations,high transmission efficiency parameters were obtained.The research results show that the average transmission efficiency of the transmission pair is negatively correlated with friction coefficient,throat coefficient,roller radius,and worm gear tooth number,and positively correlated with center distance.Among them,the friction coefficient has the most significant impact on the average transmission efficiency of the transmission pair,followed by the number of worm gear teeth,and the center distance has the least impact.
  • Tool Wear Monitoring Based on Transfer Learning and Deep Residual Network
    ZHOU Jianmin, WANG Yunqing, YANG Xiaotong, HUANG Xiliang, XIA Xiaofeng
    Machine Tool & Hydraulics. 2023, 51(18): 215-220. https://doi.org/10.3969/j.issn.1001-3881.2023.18.035
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem that the existing tool wear monitoring methods based on deep learning require too many samples and have low identification accuracy,a tool wear monitoring model based on transfer learning (TL)and deep residual network (ResNet)was established.The vibration monitoring signals during tool machining were converted into energy time-frequency diagram by continuous wavelet transform,which were used as the input of network model.The ResNet50 model trained on ImageNet dataset was used as the pre-training model,and was applied to the field of tool wear state monitoring by transfer learning method.The example verification shows that the recognition accuracy of TL-ResNet reaches 98.52%,realizing intelligent recognition under different tool wear states.So the accuracy and stability of tool wear state monitoring are improved effectively.
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CN 31-2023/U
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