锻压技术

大模数花键高速冷敲成形中影响材料变形的关键因素

英文标题：Key factors affecting material deformation in high speed cold roll-beating of large modulus splines

作者：牛婷李永堂齐会萍张晋辉王利民

单位：晋中学院太原科技大学金属材料成形理论与技术山西重点实验室山东省青岛生建机械厂

分类号：TG386

出版年,卷(期):页码：2021,46(8):109-116

摘要：

为了简化工艺参数，突破试验条件对工艺参数研究的影响，通过分析成形原理，得出高速旋转的滚打轮引起的惯性力为材料变形力，而滚打轮的旋转速度会影响材料的应变速率。通过分析变形区的变形特点，得出高速冷敲成形属于多道次成形，而滚打轮的旋转速度与工件进给速度共同决定敲击道次。通过分析不同道次晶粒尺寸的分布情况，揭示了敲击道次对微观组织的影响；敲击道次大约在16~22次时，晶粒平均尺寸进入超细晶，敲击道次大约为30~36次时，超细晶粒所占比例可达90%。在确定了敲击道次后，可根据道次与工艺参数的关系得到滚打轮转速与工件进给速度的取值范围，进而指导实际生产。

In order to simplify the process parameters and break through the influences of test conditions on the study of process parameters, through the analysis of forming principle, it was concluded that the inertial force caused by high speed rotating roller was the material deformation force, and the strain rate of material was affected by the rotation speed of roller. Then, by analyzing the deformation characteristics of deformation zone, it is concluded that the high speed cold roll-beating belonges to multi-pass forming, and the roll-beating passes are determined by the rotation speed of roller and the feeding speed of workpiece. Furthermore, by analyzing the distribution conditions of grain sizes in different passes, the influence of roll-beating passes on microstructure is revealed. When the passes of roll-beating are about 16-22, the average grain sizes are in the ultra-fine grain range, but when the passes of roll-beating are about 30-36, the proportion of ultra-fine grains reaches 90%. After determining roll-beating passes, the value ranges of rotation speed for roller and feeding speed for workpiece were determined according to the relationship between passes and process parameters, so as to guide the actual production.

基金项目：

国家自然科学基金资助项目（51475316）；山西省高等学校科技创新项目（2019L0891，2019L0888，2020L0580）

牛婷（1986-），女，博士，讲师 E-mail：niuting861010@163.com

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