GGV30离合器压盘铸件残余应力研究

Research On the Residual Stress of GGV30 Clutch Pressure Plate Casting

有限元模拟软件能否准确模拟出铸件的宏观缺陷与残余应力,热物性参数具有重要的作用。本文以某企业生产的牌号为GGV30的离合器压盘铸件为研究对象,利用ProCAST和JMatPro软件对其热物性参数进行计算。通过文献调研和实验对比,发现由JMatPro软件计算出的热物性参数更接近实际压盘铸件水平。随后将由JMatPro软件计算的热物性参数导入ProCAST软件中,并针对企业的原始浇注系统,采用ProCAST软件对压盘在4种不同浇注温度下进行铸造过程温度场、应力场的数值模拟,得到其温度场和残余应力的分布变化情况。研究表明,浇注温度对压盘不同区域温度场分布和冷却速度的影响不同,导致对不同区域残余应力的影响不同。浇注温度的提高有利于降低压盘小凸耳、内圈和部分盘面区域的残余应力,但影响效果相对较小;对于压盘大凸耳区域,随着浇注温度的提高,残余应力明显增大。

Thermal physical parameters play a very important role in accurately simulating the macroscopic defects and residual stresses of castings through finite element simulation software.In this paper,the GGV30 clutch pressure plate casting produced by a certain enterprise was taken as the specific research object,with ProCAST and JMatPro software used to calculate its thermal physical parameters.By referring to the literature and comparing experiments,it is found that the thermal physical parameters calculated by JMatPro software are closer to the actual pressure plate casting level.Then,the thermal physical properties of the pressure plate calculated by JMatPro software were imported into ProCAST software.Aiming at the original pouring system of the enterprise,the temperature field and stress field in the casting process of the pressure plate were numerically simulated at four different pouring temperatures.The results show that pouring temperature has different effects on the temperature field distribution and cooling rate in different regions of the pressure plate,resulting in different effects on residual stress in different regions.The increase in pouring temperature is beneficial to reduce the residual stress of the small lug,inner ring and part of the pressure plate surface,but the effect is relatively small.For the large lug area,the residual stress increases obviously with increasing pouring temperature.