基于收缩补偿的面曝光成型零件尺寸精度的改善
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摘要
针对面曝光成型零件易收缩的问题,采用单因素实验研究了曝光时间、分层厚度、回合等待时间这3项工艺参数对圆柱形零件尺寸收缩率的影响,以获得合理的水平值,然后通过正交实验和极差分析法得到最佳工艺参数组合及该组合下的零件尺寸收缩率,在此基础上计算出收缩补偿因子,在零件分层之前对其尺寸进行收缩补偿,以获得高尺寸精度成型零件。结果表明,在同一工艺参数下Z向的收缩较XY平面方向更为严重;对Z向尺寸精度影响程度从大到小依次为分层厚度、回合等待时间、曝光时间;最佳工艺参数条件下XY平面方向的收缩补偿因子为1.001,Z向的收缩补偿因子为1.015 2。经过对复杂零件扩散器模型的收缩补偿,发现在最佳工艺参数下Z向尺寸收缩率由未收缩补偿前的1.59%降低至0.03%,显著提升了面曝光成型零件的尺寸精度。
Aiming at the easy shrinkage problem of parts molded by mask projection stereolithography,the effects of three process parameters such as exposure time,layer thickness and round waiting time on the dimensional shrinkage of cylindrical parts were studied by single factor experiment to obtain reasonable level values,then the optimum combination of process parameters and the dimensional shrinkage rates under the combination were obtained by orthogonal experiment and range analysis.On this basis,the shrinkage compensation factors of the parts were calculated,and the shrinkage compensation was made to the size of the parts before the parts are stratified so as to obtain the high precision molding parts.The results show that the Z-direction shrinkage is more serious than the XY plane direction under the same process parameters,the influence sequence of the process parameters for Z-direction dimensional accuracy is layer thickness,round waiting time and exposure time from large to small.Under optimal process parameters,the shrinkage compensation factor in XY plane direction is 1.001,and the shrinkage compensation factor in Z direction is 1.015 2.After shrinkage compensation for the complex part diffuser model,it is found that the Z-direction dimensional shrinkage rate under the optimal process parameters is reduced from 1.59%(before the shrinkage compensation) to 0.03%,which significantly improves the dimensional accuracy of the parts molded by mask projection stereolithography.
Aiming at the easy shrinkage problem of parts molded by mask projection stereolithography,the effects of three process parameters such as exposure time,layer thickness and round waiting time on the dimensional shrinkage of cylindrical parts were studied by single factor experiment to obtain reasonable level values,then the optimum combination of process parameters and the dimensional shrinkage rates under the combination were obtained by orthogonal experiment and range analysis.On this basis,the shrinkage compensation factors of the parts were calculated,and the shrinkage compensation was made to the size of the parts before the parts are stratified so as to obtain the high precision molding parts.The results show that the Z-direction shrinkage is more serious than the XY plane direction under the same process parameters,the influence sequence of the process parameters for Z-direction dimensional accuracy is layer thickness,round waiting time and exposure time from large to small.Under optimal process parameters,the shrinkage compensation factor in XY plane direction is 1.001,and the shrinkage compensation factor in Z direction is 1.015 2.After shrinkage compensation for the complex part diffuser model,it is found that the Z-direction dimensional shrinkage rate under the optimal process parameters is reduced from 1.59%(before the shrinkage compensation) to 0.03%,which significantly improves the dimensional accuracy of the parts molded by mask projection stereolithography.
引文
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[2]吴丽珍,傅兵,邓昌云,等.一种3D打印光敏树脂的研制及性能[J].塑料科技,2017,45(6):54-58.Wu Lizhen,Fu Bing,Deng Changyun,et al.Research on preparation and properties of 3D printing photosensitive resin[J].Plastics Science and Technology,2017,45(6):54-58.
[3]黄宽,陈继民,方浩博,等.面曝光快速成型过程中树脂收缩变形[J].北京工业大学学报,2015,41(12):1 828-1 831.Huang Kuan,Chen Jimin,Fang Haobo,et al.Shrinkage deformation research of photosensitive resin in mask projection stereolithography[J].Journal of Beijing University of Technology,2015,41(12):1 828-1 831.
[4]闫鑫,赵学进,胡天亮,等.MIP-SLA面曝光快速成型精度改善方法[J].精密制造与自动化,2017(1):1-7,33.Yan Xin,Zhao Xuejin,Hu Tianliang,et al.Precision improvement method for MIP-SLA surface exposure rapid prototyping[J].Precise Manufacturing&Automation,2017(1):1-7,33.
[5]宫静,胥光申,金京,等.面曝光快速成形技术的变形[J].纺织高校基础科学学报,2011,24(4):585-589.Gong Jing,Xu Guangshen,Jin Jing,et al.The deformation of mask projection stereolithography[J].Basic Sciences Journal of Textile Universities,2011,24(4):585-589.
[6]钱波,陈子龙,王明义,等.面曝光固化快速成型曝光时间的参数优化研究[J].机械科学与技术,2018,37(2):313-317.Qian Bo,Chen Zilong,Wang Mingyi,et al.The research on the influence of exposure time on mask projection stereolithography system[J].Mechanical Science and Technology for Aerospace Engineering,2018,37(2):313-317.
[7]Tumbleston J R,Shirvanyants D,Ermoshkin N,et al.Continuous liquid interface production of 3D objects[J].Science,2015,347(6 228):1 349-1 352.
[8]Janusziewicz R,Tumbleston J R,Quintanilla A L,et al.Layerless fabrication with continuous liquid interface production[J].Proceedings of the National Academy of Sciences,2016,113(42):11 703-11 708.
[9]宗学文,肖涵,徐文博,等.基于面成型光固化3D打印制件的尺寸精度[J].工程塑料应用,2018,46(2):41-46.Zong Xuewen,Xiao Han,Xu Wenbo,et al.Study on dimensional accuracy of mask exposal stereolithography[J].Engineering Plastics Application,2018,46(2):41-46.
[10]杨来侠,杨繁荣,周文明.聚苯乙烯/玻璃纤维复合粉末SLS烧结件收缩率实验研究[J].塑料工业,2017,45(12):54-58.Yang Laixia,Yang Fanrong,Zhou Wenming.Study on shrinkage rate of polystyrene/glass fiber composite powders formed parts based on selective laser sintering experiment[J].China Plastics Industry,2017,45(12):54-58.
[11]宋彩雨,王磊,张斌,等.降低光固化收缩的研究进展[J].高分子材料科学与工程,2017,33(10):175-182.Song Caiyu,Wang Lei,Zhang Bin,et al.Research progress in reducing photocuring shrinkage[J].Polymer Materials Science&Engineering,2017,33(10):175-182.
[12]Pan Yayue,Zhao Xuejin,Zhou Chi,et al.Smooth surface fabrication in mask projection based stereolithography[J].Journal of Manufacturing Processes,2012,14(4):460-470.
[13]黄笔武,谢王付,杨志宏.一种3D打印立体光刻快速成型光敏树脂的制备及性能研究[J].功能材料,2014,45(24):24 100-24 104.Huang Biwu,Xie Wangfu,Yang Zhihong.Study on preparation and properties of photosensitive resin for rapid prototyping of 3Dprinting stereolithography[J].Journal of Functional Materials,2014,45(24):24 100-24 104.
[14]胥光申,杨根.面曝光快速成形系统制作工艺参数的优化研究[J].机械科学与技术,2015,34(2):224-228.Xu Guangshen,Yang Gen.Optimization of the processing parameters of mask projection stereolithography system[J].Mechanical Science and Technology for Aerospace Engineering,2015,34(2):224-228.