模具栏目是由黛杰汉金(沧州)精密模具有限公司FORGEWANG J/DIJET赞助刊出
第43卷第1期 Vol. 43No. 1
饭压技术
FORGING & STAMPING TECHNOLOGY
AI一Si镀层硼钢板热冲压模具磨损失效分析吴斌斌"2，林建平1,2，马治军3，刘亿12，郭水军3（1.同济大学上海市地面交通工具空气动力与热环境模拟重点实验室，上海201804；
2018年1月 Jan.2018
2.同济大学机械与能源工程学院，上海201804；3.上海赛科利汽车模具技术应用有限公司，上海201209）
摘要：针对热冲压生产过程中模具易磨损失效的间题，以A1-Si镀层板冲压用CR7V-L钢磨损退役模具镶块为分析对象，利用扫描电镜、能谱仪及显微硬度计对镶块磨损表面和剖面进行微观形貌分析、化学元素测试及硬度测量，对热冲压生产工况下模具的磨损机理进行研究。研究结果表明A1-Si镀层板热冲压模具存在特殊的磨损过程：板料镀层会粘附在模具表面，并在冲压循环中发生脱落、再粘附；同时，模具表面发生氧化和被劳，造成材料损失并随粘附物脱离，这是造成模具磨损失效的主要原因。此外，模具亚表层硬度下降，
，发生明显的塑性变形，会加剧模具的磨损失效。
磨损机理：粘附
关键词：热冲压模具：磨损失效；A1-Si镀层： DOI: 10. 13330/j. issn. 1000-3940. 2018. 01. 019
文献标识码：A
中图分类号：TG115.2
文章编号：1000-3940（2018）01-0110-07
Wearfailureanalysisonhotstampingdieof boronsteel
sheetwithAl-Si coating
Wu Binbin'.?, Lin Jianping'.2, Ma Zhijun', Liu Yi'.2, Guo Shuijun
( 1. Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Tongji University , Shanghai 201804, China; 2. School of Mechanical Engineering, Tongji University, Shanghai 201804, China ;
3. Shanghai Superior Die Technology Co. , Lid , Shanghai 201209, China)
Abstract : Aceording to the problem of die wear failure in hot stamping process, for the wear retired die inserts of steel CR7V-L used fo stamping of Al Si coated plate, the micromorphology analysis, chemical element test and hardness measurement of the wear surface and profile of insert were conducted by scanning electron microscope (SEM), energy dispersive spectrometer ( EDS) and microhandness tester, and the wear mechanisms of die in hot stamping process were studied. The results show that there is a special wear process in the hot stam-ping die of Al Si coated plate, namely the plate coating adlheres to the die surface, and then the adhesion layer flls off and new coating re-peats the adhesion during the stamping process, At the same time, the oxidation and fatigue appeared on the die surface result in the material loss with detachment of the adhesive layer, which are the main wear mechanisms of the hot stamping die. In addition, the hardness on the sub-surface of die decreases, and the large plastic defomation oceurs obviously. Thus, the wear failure of the hot stamping die is exaxerbated. Key words : hot stamping die; wear failure; Al Si coating; wear mechanism; adhesion
热冲压是一种高强钢成形技术，能够在保证冲压零件使用安全性能的前提下实现轻量化，在汽车领域有广阔的应用前景[1]。热冲压成形工艺是将板料加热，使其完全奥氏体化后再进行冲压，并在成形和保压过程中进行萍火处理，以获得具有均勾马
收稿日期：20170720；修订日期：20171005 基金项目：国家自然科学基金资助项目（10002340060）
作者筒介：吴斌减（1994-），男，额土研究生 E-mail: chengzhuhit@ 163. com
通讯作者：林建平（1958-），男，教授，博士生导师万方据ail：jplin58@ tongi.edu.en
氏体组织的超高强度钢构件[2-3)。热浸镀AI-Si镀层能够提高板料耐热耐腐蚀性能、抗高温氧化性能和外观装饰性能等，在热冲压生产中有着广泛的应用4)。研究表明，A1-Si镀层板料能够降低热冲压模具磨损3]。对镀层板与模具的摩擦磨损行为进行研究，分析其磨损机理，寻求减少磨损的措施，对提高模具耐磨性、降低生产成本有若重要意义。
目前，Al-Si镀层板料对模具材料的磨损研究大多通过实验室中的摩擦磨损试验完成。HardellJ 等通过SRV往复式擦磨损试验机研究了不同温度下A1-Si镀层硼钢板与模具钢的磨损规律，结果表明800℃下A1-Si镀层能够明显降低模具钢的磨