Journal of Mechanical Engineering >

2017 , Vol. 53 >Issue 20: 77 - 88

DOI: https://doi.org/10.3901/JME.2017.20.077

Study on Control Strategies of Two-roll Straightening for Bar High Precision Straightening

  • MA Ziyong ,
  • MA Lifeng ,
  • WANG Rongjun ,
  • HUANG Qingxue ,
  • MA Lidong
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  • Metallurgical Equipment Design Theory and Technology Key Laboratory of Shanxi Province, Taiyuan University of Science and Technology, Taiyuan 030024

Received date: 2016-09-09

  Revised date: 2017-02-20

  Online published: 2017-10-20

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Abstract

High precision straightening roll design and process parameters control are the core technology of the two-roll straightener. In order to meet the requirements of bar high precision straightening, the design method of “three-stage concave roll and two-stage convex roll” is proposed based on wear state of straightening roll, elastic-plastic theory, hardening coefficient model of the plastic deformation and stress neutral layer offset theory. On these basis, according to the local contact state of bar and the straightening roll, the models of the roll angles and roll gap between bar and straightening roll are established, and the change rules and control strategies of two-roll straightening process parameters (roll angles, roll gap, straightening speed and plates spacing) are studied, and the specific example and finite element simulation analysis are put forward to verify the control strategies. From the straightening force, plastic deformation depth, straightness and residual stress, it is proved that the effectiveness of roll shape design method and process control strategies, the straightness of straightened bars is less than 1 mm/m in the field experiment, and the straightness fully meets the standard of high precision straightening.

Key words： two-roll straightening; roll shape design; process control; finite element; field experiment

Cite this article

MA Ziyong , MA Lifeng , WANG Rongjun , HUANG Qingxue , MA Lidong . Study on Control Strategies of Two-roll Straightening for Bar High Precision Straightening[J]. Journal of Mechanical Engineering, 2017 , 53(20) : 77 -88 . DOI: 10.3901/JME.2017.20.077

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