外抱式锥面弹性夹具和薄壁零件夹持变形的分析计算

发布时间：2018-03-13 13:07

本文选题：锥面夹具　切入点：薄壁零件　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：薄壁零件的加工精度要求往往较高,但由于其刚度低,易受夹紧力影响产生较大夹持变形而影响其加工精度。本文在分析薄壁零件定位和夹持特性的基础之上,以减小薄壁零件的夹持变形提高其加工精度为目的,设计用于自动车床上夹持薄壁零件的外抱式锥面弹性夹具(以下简称锥面弹性夹具)。本文采用理论推导、有限元模拟计算以及回归分析等方法,分析计算了锥面弹性夹具的夹紧力和薄壁零件的夹持变形。具体研究内容如下:首先,根据薄壁零件定位和夹持特性,初步确立薄壁零件的夹持方案;并根据零件的加工要求设计了无轴向定位的锥面弹性夹具和轴向定位的锥面弹性夹具。其次,根据力学理论知识推导出某特定锥面弹性夹具的夹紧力的理论计算公式;同时利用有限元软件对该锥面弹性夹具进行了模拟计算,得到该锥面弹性夹具的夹紧力;将有限元模拟计算求得的结果与理论计算公式求得的结果进行对比,相对误差15%,由此验证本文有限元模拟计算方法的正确性。最后,运用正交试验表安排计算参数(夹具的锥面半锥角、关键结构尺寸;轴向拉紧力;零件的外径、被夹持长度和壁厚等),对本文的外抱式锥面弹性夹具夹持薄壁零件进行有限元模拟计算,得到锥面弹性夹具夹持薄壁零件的夹紧力和薄壁零件的夹持变形;根据有限元模拟计算结果,利用回归分析方法建立锥面弹性夹具的夹紧力和薄壁零件的夹持变形的数学模型,为锥面弹性夹具的参数设计以及薄壁零件的夹持变形预测提供参考。
[Abstract]:The machining precision of thin-wall parts requirements are often higher, but because of its low stiffness, easy clamping force influence and affect the machining accuracy of large clamping deformation. Based on the analysis of the positioning and clamping characteristics of thin-walled parts, in order to reduce the clamping deformation of thin-walled parts to improve the machining precision for the purpose of design for automatic lathe clamping thin-walled parts holding type cone elastic fixture (hereinafter referred to as the cone elastic fixture). This paper uses theoretical analysis, finite element simulation and regression analysis method, analysis and calculation of the cone elastic fixture clamping force and the clamping deformation of thin-walled parts. The specific contents are as follows: firstly, according to the thin wall the parts and clamping characteristics, the initial establishment of a program to clamp the thin-walled parts; and the design of cone cone elastic elastic fixture and axial positioning without axial positioning clamp according to the processing requirements of parts Out. Secondly, according to the calculation formula of mechanics theory knowledge derived from a particular elastic clamping force of the clamp cone theory; the cone elastic fixture was simulated using finite element software, get the clamping force of the conical elastic fixture; finite element simulation results obtained with the results obtained by theoretical calculation formula contrast, the relative error of 15%, which verify the correctness of the finite element simulation method. Finally, using the orthogonal test table arrangement parameters (half cone angle of the conical fixture, key structural dimensions; axial tension; parts of the outer diameter of the clamped length and wall thickness), the holding type cone elastic clamping thin-walled parts of finite element simulation to deformation of clamp force cone elastic clamp of thin-walled parts and thin-walled parts; based on the finite element analysis results by regression The mathematical model of clamping force and clamping deformation of thin-walled elastic fixture is established based on the analysis method, which provides reference for parameter design of cone elastic fixture and prediction of clamping deformation of thin-walled parts.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG751.1

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