Preheating of the powder bed is a very important step in the process of selective laser sintering (SLS), the uniformity of preheating temperature has an important influence on the efficiency and precision of parts. For the large SLS equipment (2 m×2 m), it is difficult to meet the requirements of the temperature uniformity of the powder bed due to the large area of the powder bed. The new preheating method is proposed based on subarea control. The numerical analysis model is established based on coefficient of radiant energy, experimental platform is built, and nylon 12 as experimental materials and the accuracy of the numerical model is verified by the experimental research of preheating. The optimal preheating strategy of large SLS equipment is confirmed.2 m×2 m nylon 12 powder bed as control object and room temperature difference control in 5℃ as the experiment suggests, technological requirements of equipment are met, which provide technical support for the key problem of SLS equipment development and forming precision control.
HUANG Xiaokang
,
TIAN Xiaoyong
,
TIAN Xiaoyang
,
CAO Yi
,
TONG Zhiqiang
,
LI Dicheng
. Research of Large Scale SLS Equipment Preheating Strategy Based on Subarea Control[J]. Journal of Mechanical Engineering, 2018
, 54(7)
: 160
-166
.
DOI: 10.3901/JME.2018.07.160
[1] SINGH S, SHARMA V S, SACHDEVA A, et al. Optimization and analysis of mechanical properties for selective laser sintered polyamide parts[J]. Materias and Manufacturing Processes, 2013, 28(2):163-172.
[2] KANDE O, DALGARNO K W, MUNGUIA J, et al. Assessment of tests for use in process and quality control systems forselective laser sintering of polyamide powders[J]. Journal of Materials Processing Technology, 2016, 229:549-561.
[3] Van HOOREWEDER B, MOENS D, BOONEN R, et al. On the difference in material structure and fatigue properties of nylon specimens produced by injection molding and selective laser sintering[J]. Polymer Testing, 2013, 32(5):972-981.
[4] BAI, J, ZHANG B, SONG J, et al. The effect of processing conditions on the mechanical properties of polyethylene produced by selective laser sintering[J]. Polymer Testing, 2016, 52:89-93.
[5] 史玉升,钟建伟,蔡道生,等. 基于零件切片的选择性激光烧结预热温度控制方法[J]. 机械工程学报, 2006, 42(6):67-72. Shi Yuasheng, ZHON Jianwei, CAI Daosheng, et al.Investigation on the preheating temperature control based on part's slicing in selective laser sintering[J]. Chinese Journal of Mechanical Engineering, 2006, 42(6):67-72.
[6] Van HOOREWEDER B, KRUTH J. High cycle fatigue properties of selective laser sintered parts in polyamide 12[J]. CIRP Annals-Manufacturing Technology, 2014, 63(1):241-244.
[7] GOODRIDGE R D, TUCK C J, HAGUE R J M. Laser sintering of polyamides and other polymers[J]. Progress in Materials Science, 2012, 57:229-267.
[8] SETTI G D O, LOPES da S J V, OLIVEIRA M F, et al. Surface methods for monitoring the densification of parts in the selective laser sintering process[J]. Rapid Prototyping Journal, 2014, 20(2):157-163.
[9] 李湘生,史玉升,黄树槐. 激光选区烧结成形机的粉末预热研究[J]. 机械工程学报, 2002, 38(3):94-98 LI Xiangsheng, SHI Yusheng, HUANG Shuhuai. Investingation on preheating of powder in sls machine.[J]. Chinese Journal of Mechanical Engineering, 2002, 38(3):94-98.
[10] 魏青松,史玉升,刘洁. 大台面选择性激光烧结快速成形预热优化设计[C]//第13届全国特种加工学术会议,江西南昌, 2009, 8月. WEI Qingsong, SHI Yusheng, LIU Jie. Optimization of the preheating during selective laser sintering with a large processing table[C]//The 13th National Conference on Special Processing, Jiangxi, Nanchang, 2009, August.
[11] INCROPERA D P F P, DEWITT T L B. Fundamentals of heat and mass transfer[M]. Beijing:Chemical Industry Press, 2015.
[12] 陶文铨. 传热学[M]. 北京:高等教育出社, 2006. TAO Wenquan. Heat transfer[M]. Beijing:Higher Education Press, 2006.
