雨刮器压铸模具激光填丝焊修复性能  

The property of die-casting dies of wiper repaired by laser welding with filler wire

作　　者：刘立君[1] 张红兴[1,2] 张伟杰[1,2] 王刚[1,3] 齐萌[1,2] 

机构地区：[1]浙江大学宁波理工学院,浙江宁波315100 [2]太原科技大学机械工程学院,山西太原030024 [3]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080

出　　处：《山东大学学报（工学版）》2015年第3期73-79,共7页Journal of Shandong University（Engineering Science）

基　　金：浙江省零件轧制成形技术研究重点实验室开放基金资助项目(ZKL-PR-200303);宁波市自然基金资助项目(2014A610078);国家自然科学基金资助项目(51275468)

摘　　要：为了解决模具表面龟裂问题,采用激光技术和仿生技术相结合的方法进行修复。利用激光填丝焊修复的方法,在模具试样表面制备修复层,对修复层进行组织观察、硬度分析及X射线能谱分析,得出激光填丝焊修复的最优工艺参数为电流180 A,离焦量-10 mm,激光脉宽8 ms,填丝速度0.032 m/min,并对修复的模具进行热疲劳试验和寿命测试。试验结果表明,利用激光填丝焊修复受损模具,提高模具表面硬度,有效细化组织晶粒,延长模具使用寿命,为压铸模具修复提供一种新的思想。In order to solve the problem of cracks on die-casting dies,the method of combining laser technology and bionic technology was used to repair them.Repairing layer on die-casting dies was prepared utilizing the method of laser wire filling welding;the optimal process parameters were obtained through the microstructure observation,hardness analysis and energy-dispersive X-ray analysis.These parameters were that the current was 1 80 A,the defocusing amount was -10 mm,the laser pulse width was 8 ms,the wire filling speed was 0. 032 m/min,and thermal fatigue test and life test of die-casting dies were performed using these parameters.The experimental results showed that hardness of die-casting dies surface were improved,tissue grain was refined effectively,and the life of mold was extended,which could provide a new thought for repairing the die-casting dies.

关 键 词：压铸模具 激光技术 激光焊接 填丝焊 组织特征 热疲劳 

分 类 号：TG174[金属学及工艺—金属表面处理]