雨刮器压铸模具激光填丝焊修复性能

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。

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

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 180 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.