模具断裂失效浅析及案例分析

Case Study and Analysis of Mould Fracture Failure

简要概述模具断裂失效的类型及原因,并以SKD61和SKH51两失效件为例,详细阐述在实验室条件下如何有效利用现有检测设备,以观察并分析得出其失效原因。首先,运用体视显微镜,观察裂纹开裂处表面情况;其次,参照国家标准,利用光学显微镜,评定失效件非金属夹杂物是否合格;再者,结合洛氏硬度计,判断失效件金相组织有无异常。最终断定,工件失效的主要原因与其热处理过程有着密切联系,因此需严格控制热处理工艺,以避免工件过早时效。

Several basic classifications and causes of mould fracture failure are summarized briefly. Two examples of SKD61 and SKH51 mould failure were used to expatiate how to use the available inspection equipments analyze and determine the main cause of two failure parts Stereoscopic microscopy is employed to examine the fracture origin, and optical microscopy with Rockwell hardness testing is applied to detect the microscopic features, including non-metallic inclusions and microstructures according to the national standard. It is determined that the main reason of mould fracture failure is closely relevant to heat treatment process. Subsequently, the heat treatment should be strictly controlled so as so prevent the premature aging.