According to indicator for gear accuracy testing, the questions that need pay attention to during accuracy controlling was put forward, and corresponding solution for each question was proposed. Based on systemic analysis of the problems such as elastic deformation of tooth profile, tooth surface and die life during the hot forging and cold forging process, the hot forging-cold finishing process was determined and the design of precision forging and hot forging dies were finished. The experiment study on the hot precision forging process for different blank dimensions and upsetting ratios was carried out, and the impact of blank and upsetting ratio to tooth file was analyzed. The result shows that, when billet diameter is less than the diameter at the small end of the gear and upset ratio is 1.5, the tooth profile and tooth head of the hot forging gear are filled well, and the tooth profile is full and accurate. After cleaning the iron oxide skin thoroughly, the surface quality of the forging is good.%根据齿轮精度检验的指标,提出了精度控制需要注意的问题,并针对每个问题提出解决办法.在系统分析热精锻和冷锻成形过程中齿形、齿面、弹性变形及模具寿命等问题的基础上,确定了热精锻—冷精整工艺流程,完成了精锻件及热精锻模的设计.对不同坯料尺寸和镦粗比的热精锻工艺过程进行了试验研究,分析了坯料和镦粗比对齿形充满的影响.研究结果表明,采用直径小于分锥角小端直径的坯料,选定镦粗比1.5进行热锻成形,锻造的热精锻齿轮齿形、齿顶充满效果较好,冷精整后的齿形饱满准确,在对氧化铁皮进行彻底清理后,锻件表面质量良好.
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