五轴螺旋锥齿轮加工机床滚珠丝杠热分析
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摘要
某五轴螺旋锥齿轮加工机床的实际加工精度远小于设计精度,初步判断滚珠丝杠系统热变形是影响高精度机床加工精度的主要原因之一。现提出滚珠丝杠系统热变形导致五轴螺旋锥齿轮加工机床精度低的假设,并通过有限元分析软件Workbench对其进行分析;设计四组有限元热分析对假设进行验证,研究了丝杠系统转速和水平竖直放置对机床热变形的影响,结果证实了假设的正确性。利用验证结果可进行机床结构优化以及指导相似机床设计。
The actual processing accuracy of a five-axis spiral bevel gear machine tool is far less than the design accuracy. Preliminary judgment shows that the thermal deformation of ball screw system is one of the main factors affecting the processing accuracy of high precision machine tools. The hypothesis that the thermal deformation of ball screw system leads to low precision of five-axis spiral bevel gear machine tool is put forward and analyzed by the finite element analysis software "workbench".Four groups of finite element thermal analysis were designed to verify the hypothesis. The effects of rotational speed and horizontal vertical placement of the screw system on the thermal deformation of the machine tool were studied. The results confirmed the validity of the hypothesis. The validation results can be used to optimize the structure of machine tools and to guide the design of similar machine tools.
The actual processing accuracy of a five-axis spiral bevel gear machine tool is far less than the design accuracy. Preliminary judgment shows that the thermal deformation of ball screw system is one of the main factors affecting the processing accuracy of high precision machine tools. The hypothesis that the thermal deformation of ball screw system leads to low precision of five-axis spiral bevel gear machine tool is put forward and analyzed by the finite element analysis software "workbench".Four groups of finite element thermal analysis were designed to verify the hypothesis. The effects of rotational speed and horizontal vertical placement of the screw system on the thermal deformation of the machine tool were studied. The results confirmed the validity of the hypothesis. The validation results can be used to optimize the structure of machine tools and to guide the design of similar machine tools.
引文
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[2] Yang S,J.Yuan J,Ni J.The improvement of thermal error modeling and compensation on machine tools by CMAC neural network[J].International Journal of Machine Tools and Manufacture,1996,36(4):31-35.
[3] Hatamura Y,Nagao T,Mitsuishi M,et al.Development of an intelligent machining center active compensation for thermal disortion[J].Annals of CIRP,1993,42(1):549-552.
[4] Kim S K,Cho D W.Real time estimation of temperature distribution in a ball-screm system[J].International Journal of Machine Tools and Manufacture,1997,37(4):451-464.
[5] Shyh-chour Hung.Analsis of a model to forecast thermal deformation of ball screw feed drive system[J].Int J Math Tools Manufact,1995,35(8):1099-1104.
[6] 陈曼龙.滚珠丝杠副选型设计中的热变形问题[J].机械设计与制造,2008(12):46-47.
[7] 何震.机床滚珠丝杠系统热特性分析及其热变形补偿[D].成都:西南交通大学,2009:4-33.
[8] 钟名东.高速高精数控车床滚珠丝杠进给系统热态特性研究[D].南昌:华东交通大学,2011:3-35.
[9] 韩军,李明亚,张玲聪,等.高速实心/空心滚珠丝杠热动态性能分析与研究[J].机械设计与制造,2015(10):80-83.
[10] 徐阳阳,祖莉,汪远远,等.滚珠丝杠副热变形模型理论分析及其对定位精度影响的试验研究[J].组合机床与自动化加工技术,2018(1):1-3,7.
[11] 郭松路,刘德平,钱谦,等.立式加工中心整机热特性有限元分析[J].机械设计与制造,2014(2):65-68.
[12] 杨淇帆,梁睿君,叶文华.基于有限元的机床主轴箱部件的热特性分析[J].机械科学与技术,2012,31(11):1860-1863,1867.
[13] 翟少剑.机床整机温度场建模及其动态特性分析[D].北京:北京工业大学,2011:2-36.