花键轴振动挤压成形试验研究

发布时间：2018-06-08 14:32

本文选题：花键轴 + 振动挤压　；参考：《西安交通大学学报》2015年11期

【摘要】：针对花键轴挤压成形制造效率低、模具所受载荷大的问题,采用了一种新的振动辅助挤压成形工艺,并进行了花键轴成形试验、微观组织分析和硬度测试,揭示了成形载荷的主要影响因素及金属流动规律。试验设备为振动挤压机床,采用模数为1.75、齿数为10的花键轴挤压模具对直径为17.9mm、材料为AISI1045A的棒料进行了振动挤压成形试验,模具每进给1mm便回程0.5mm,振动频率分别取10、15和20Hz。结果表明:相比于直接挤压,振动挤压成形过程的成形力可降低将近25%,原因是在模具回程过程中润滑油得以流入模具与坯料的接触面,重新生成油膜,从而减小了摩擦力;在试验频率范围内,成形载荷随振动频率的提高而增大;振动挤压成形花键轴具有表面质量高、成形速度快、材料流动均匀的优点,且沿轴向齿顶圆直径变化小,成形精度高;与传统的直接挤压成形相比,振动挤压成形花键轴齿型部位的硬度降低了近10%,有利于成形。
[Abstract]:Aiming at the problems of low manufacturing efficiency of spline shaft extrusion forming and large load on die, a new vibration-assisted extrusion forming process was adopted, and the forming test, microstructure analysis and hardness test of spline shaft were carried out. The main influencing factors of forming load and metal flow law are revealed. The test equipment is vibration extruding machine tool. The extrusion die of spline shaft with module 1.75 and tooth number 10 is used to test the vibration extrusion forming of bar material with diameter of 17.9 mm and material AISI 1045A. The die returns 0.5mm for each 1mm feed, and the vibration frequency is 1015 and 20Hz, respectively. The results show that the forming force of vibration extrusion process can be reduced by nearly 25% compared with that of direct extrusion. The reason is that the lubricating oil can flow into the contact surface of the die and the blank during the return process of the die, and the oil film can be formed again, thus reducing the friction force. In the range of test frequency, the forming load increases with the increase of vibration frequency, the spline shaft formed by vibration extrusion has the advantages of high surface quality, fast forming speed, uniform material flow, small change in the diameter of the top circle along the axial tooth, and high forming accuracy. Compared with traditional direct extrusion, the hardness of spline shaft profile in vibration extrusion is reduced by nearly 10%, which is beneficial to forming.
【作者单位】：西安交通大学机械工程学院;中航工业南方航空工业(集团)有限公司;
【基金】：国家科技重大专项资助项目(2014ZX04001021) 陕西省工业攻关资助项目(2014K08-34)
【分类号】：TG376;TH133.2

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