大模数冷挤压直齿轮冷整形方式的选择  

The choice of cold precision sizing method for cold extrusion gear with big modulus

作　　者：梁强[1] 周杰[1] 朱姗姗[1] 夏泽雨 刘正伟 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆众联齿轮传动有限公司,重庆402247

出　　处：《中南大学学报（自然科学版）》2017年第8期1995-2001,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金面上资助项目(51275543);重庆市科委应用开发(重大)项目(cstc2014yykf C70003)~~

摘　　要：为提高大模数冷挤压直齿轮冷整形后的精度,以冷挤压齿轮实测尺寸为基础,建立基于误差模型的直齿轮冷整形过程的弹塑性有限元仿真模型,通过数值模拟得到不同冷整形方式下齿轮应力应变分布及齿形凹模的受力情况,并得出不同冷整形方式对精整后齿轮精度的影响规律。针对模拟结果进行冷整形工艺实验,并对整形前后齿轮的检测数据进行配对t检验。研究结果表明:采用只整形齿面的方式可以显著提高冷挤压齿轮的精度,齿轮齿形精度由9级提高至7级,齿向精度由10级提高至8级,工艺实验结果与模拟结果较一致。In order to improve gear accuracy in cold precision sizing, an elastic plastic finite element model based on the measurement of extruded gear was built to simulate the cold precision sizing process. The stress and strain distributions of the gear, as well as the stress of toothed die with different methods of cold precision sizing were analyzed by numerical simulation. The rule of influence of cold precision sizing method on gear accuracy was obtained. The experiment of the spur gear cold precision sizing process was conducted and the generated data went through a paired sample t-test for significance analysis. The results show that the accuracy of cold extruded gear improves significantly by sizing only tooth face. The magnitude of tooth profile accuracy increases from 9 to 7 and the magnitude of gear direction precision increases from 10 to 8 after cold precision sizing. Practical results are consistent with the simulation results.

关 键 词：大模数直齿轮 冷整形方式 齿轮精度 数值模拟 

分 类 号：TG316[金属学及工艺—金属压力加工]