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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 mold surface cracking, laser and biomimetic techniques are used to repair. The repair layer was prepared on the surface of the mold by laser wire-bonding welding repair method. The microstructure, hardness and X-ray spectrum analysis of the repaired layer were analyzed. The results showed that the optimum process parameters of laser wire-bonding welding repair were current 180 A , Defocus amount -10 mm, laser pulse width 8 ms, wire feeding speed 0.032 m / min, and thermal fatigue test and life test of the repaired mold. The experimental results show that the use of laser wire welding repair damaged mold to improve the mold surface hardness, grain refinement effectively to extend the service life of the mold for the die-casting mold repair provides a new idea.