Abstract A method using backward extrusion of a cylindrical cup to evaluate the anti-galling ability of a zinc phosphate coating is proposed. In this method, galling generation on the inner surface of the cup is judged by the rapid increase in the extrusion load in the extrusion load-stroke diagram. By using a divided punch, the tip of the punch is left at the extrusion end when the main body of the punch is returned after extrusion, thus the galling situation on the inner surface of the cup is perfectly maintained. It is confirmed that the rapid increase in the extrusion load is caused by the generation of galling, and the residual coating thickness measured by FE-AES at the galling generation position is smaller than the reduced peak height Rpk of the punch tip.

中文翻译：

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圆柱杯反向挤压法对磷酸锌涂层抗咬合能力的评价

摘要 提出了一种利用圆柱杯反挤压法评价磷酸锌涂层抗咬合能力的方法。在这种方法中，通过挤压载荷-行程图中挤压载荷的快速增加来判断杯子内表面是否产生磨损。采用分体式冲头，冲头主体在挤压完成后返回时，冲头尖端留在挤压端，从而完美地保持了杯子内表面的磨损情况。经证实，挤压载荷的快速增加是由擦伤的产生引起的，在擦伤发生位置通过FE-AES测量的残余涂层厚度小于冲头尖端降低的峰高Rpk。