锻压技术

模具通道交角对ML35钢高强紧固件前驱物等径转角加工的影响

英文标题：Influence of die channel intersection angle on equal-diameter angular processing of precursor for ML35 steel high strength fastener

作者：赵军杨云良张晗周一帆文全兴李鑫

单位：北华航天工业学院燕山大学

关键词：模具通道交角 ML35钢等径转角加工有限元分析高强紧固件

分类号：TG37

出版年,卷(期):页码：2019,44(3):72-76

摘要：

利用有限元分析与实验相结合研究了模具通道交角对ML35钢高强紧固件前驱物等径转角加工载荷、应力、应变及加工生热的影响，研究结果表明，加工载荷不仅使材料获得纯剪切变形，而且其中一部分载荷功转化成热使材料升温，实验实测与有限元分析得到最大加工载荷为53 kN（模具通道外交角φ＝30°），温升区主要位于模具通道拐角处（即主变形区内），最高温升至106 ℃，随φ角以30°递增，主变形区应力场三角形轮廓演变成近似平行四边形，φ角的增大促进了材料流变行为，但是沿挤出方向应变分布规律并没有随φ角的增加出现明显变化，均呈近似正态分布特征。经过等径转角加工的螺钉紧固件，在几何形状近似不变的条件下，强度由559 MPa提升至976 MPa。

Influences of die channel intersection angle on equal-diameter angular processing load, stress, strain and heat generation of precursor for ML35 steel high strength fastener were studied by combining finite element analysis with experiment. The research results show that the processing load not only makes the material obtain pure shear deformation, but also the part of the load work is converted into heat to make the material warm, the experimental measurement and finite element analysis show that the maximum processing load is 53 kN (die channel external intersection angular φ=30°), the temperature rise area is mainly located at the corner of the die channel (the main deformation zone), the maximum temperature rises to 106 ℃ with the increasing angle φ by 30°, triangular contour in stress field is transformed into approximately parallelogram, and the increase of angle promotes the flowing deformation behavior of materials. However, the strain distribution along the extrusion direction is not change significantly with the increase of angle φ, and all of them are approximately normal distribution characteristics. Thus, the strength of the high strength screw fasteners by equal-diameter angular processing is increased from 559 MPa to 976 MPa without changing the geometric shape approximately.

基金项目：

河北省自然科学基金资助项目（E2013409002）；河北省高等学校科学技术研究重点项目（ZD2018239）；北华航天工业学院科研基金重点项目（ZD-2016-03）

赵军（1975-），男，博士，副教授，E-mail：zjqhd@163.com

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