锻压技术

复合强化对H13钢反挤凸模耐磨性的影响

英文标题：Influence of composite strengthening on wear resistance of back extrusion punch for H13 steel

作者：姜鼎王匀李超杜金星练强

分类号：TG142；TG178

出版年,卷(期):页码：2019,44(9):106-112

摘要：

针对H13钢温成形反挤凸模易磨损和使用寿命短的缺陷，利用有限元仿真分析了挤压成形过程中反挤凸模的磨损规律，获得了对应的最易磨损区和最大磨损量，对凸模易磨损区域进行整体调质处理-激光冲击复合强化，分别评价了激光冲击前后模具的表面硬度、表面形貌和残余应力。在等速万向节三柱槽壳生产线上进行了反挤凸模磨损寿命对照试验，利用三维轮廓仪对不同阶段的反挤凸模倒角圆弧半径R进行测量，以分析模具的磨损趋势。结果表明，相比单一热处理强化，复合强化后模具表面残余压应力平均达760 MPa，影响深度约为0.8 mm，表面硬度提升12.5%，模具寿命提高了60.3%。

For the defects of quick wearing and short service life of back extrusion punch in warm forming of H13 steel, the wear law of punch during back extrusion process was analyzed by finite element simulation, and the corresponding quick wearing area and the maximum wear quantity were obtained. Then, a composite strengthening treatment with tempering and laser shock hardening for these areas was carried out, and the surface hardness, surface topography and residual stress of these areas were evaluated before and after laser shock processing. Furthermore, a service life comparative test of back extrusion punch was conducted on the production line of tripod universal joint housing, and the chamfered arc radius R of back extrusion punch at different stages was measured by 3D contour graph in order to analyze the wear trend of die. The results show that compared to the single heat treatment strengthening, the average residual compressive stress on the die surface after composite strengthening is up to 760 MPa, the influence depth is about 0.8 mm, the surface hardness is increased by 12.5%, and the service life of die increases by 60.3%.

基金项目：

国家自然科学基金资助项目(51575245, 51679112)

姜鼎（1992-），男，硕士研究生 E-mail：jdm064@163.com 通讯作者：王匀（1975-），男，博士，教授 E-mail：wangyun@ujs.edu.cn

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