热震法分离电镀金刚石工具磨料层与基体的研究

Thermal Shock Method to Separate Abrasive Layer and Substrate of Electroplated Diamond Tools

提出一种电镀金刚石工具磨料层与基体的绿色分离方法,可以实现工具的有效回收和再利用.采用有限元分析软件ANSYS模拟了电镀金刚石磨头的热震过程,分析了工具基体与镍镀层之间的热应力及其分布.计算结果表明:在冷热载荷作用下,镀层与基体之间发生热膨胀失配,导致界面附近易出现疲劳破坏,产生裂纹,且裂纹首先产生于界面形状突变区域.通过电镀金刚石钻头的热震实验观察到磨料层的脱落现象,验证了有限元分析结果,同时也证明了热震法分离电镀金刚石工具磨料层与基体的可行性.

One separating method of abrasive layer and substrate named thermal shock method is proposed to realize the recovery of the electroplated diamond tools. Taken electroplated diamond grinding wheel for example, the distribution of the thermal stresses between the nickel coating and 45 steel substrate were simulated by the finite element software ANSYS. Under the cycling interaction of hot and cold load, the calculation results indicate the thermal expansion mismatches between coating and substrate in the fatigue and cracks near the interface, and the cracks usually first occurred in the transition region of the interface shape. The thermal shock experiments of electroplated diamond tools were carried out and the separating between abrasive layer and substrate was observed. The finite element analysis results were verified through experiments, the feasibility of thermal shock in separating the abrasive layer and the substrate was proved.