滚轧轮运动方式对T2蜗杆件齿形和硬度的影响

Influence of roller motion on profile and hardness of T2 worm parts

针对T2蜗杆件的滚轧成形过程进行了数值模拟与实验研究,滚轧方式采用轴向平行的两滚轧轮结构,在滚轧轮自转的同时保证径向位移。分析了滚轧轮的两种运动方式(单向旋转和往复旋转)对蜗杆件齿形、硬度、应变分布和流线分布的影响规律,结果表明:数值模拟中往复滚轧工件的齿形按照齿的中轴线对称,工件无轴线位移;实验中往复滚轧工件的齿形两侧硬度分布比单向滚轧成形工件均匀,流线分布更加均匀且对称,数值模拟结果中的应变变化趋势与实验测得的硬度变化、流线变化趋势一致。说明往复滚轧对提升蜗杆件的强度和硬度有实质性的帮助。同时对比分析了模拟件和实验件的齿形参数,最大误差为1. 46%,数值模拟的精度较高。

The rolling process of T2 worm parts was studied by numerical simulation and experiment. The rolling of the worm part was realized by using two rollers forming method with axality parallel and the radial displacement was guaranteed when the roller rotated. The influences of unidirectional rotation and reciprocating rotation of the roller on the profile,the hardness of the teeth,the strain distribution and the streamline distribution of the worm were analyzed. The results show that in numerical simulation,the profile of reciprocating rolling workpiece is symmetrical according to the central axis of the tooth,and the workpiece has no axis displacement. The hardness distribution of both sides of the tooth of the reciprocating rolling workpiece is more uniform than that of the unidirectional rolling workpiece. The streamline distribution is more uniform and symmetrical,and the strain variation in the numerical simulation is consistent with the experimental variation of hardness and streamlines. It shows that the reciprocating rolling can improve the strength and hardness of the lifting worm significantly. The analysis of the teeth of the simulated and experimental parts shows that the maximum error of the gear parameters between the simulated and the experimental parts is 1. 46%,and the accuracy of the numerical simulation is high.