模具是实现少、无切削加工的重要工艺装备，在现代生产中日益得到广泛的应用。在冷挤压加工时，常常遇到一些妨碍正常投产的重要问题，就是模具受到损坏，主要表现有如下三种失效类型：
⑴ 断裂失效 如塑性断裂失效、疲劳断裂失效、蠕变断裂失效、低应力脆断失效、介质加速断裂失效等。
⑵ 过量变形失效 主要包括过量的弹性和塑性变形失效。
⑶ 型腔表面损伤失效 如磨损失效、腐蚀失效、表面疲劳（点蚀或剥落）失效等。
当凸、凹零件产生上述这种缺陷时，那就不能制造出合格的挤压件，严重影响工厂的生产计划，为关此，此，面临工程技术人员应要及时解决造成这些缺陷的面临工程技术人员应要及时解决造成这些缺陷的键问题。
生产实践指出，每副模具的承载能力、工作使用寿命、制造精度及产品合格率，在很大程度上取决于模具钢的化学成分，模具零件的加工质量及热处理工艺等。为了生产出高质量、高经济效益的产品挤压件，必须从模具结构设计、选用模具材料、机械加工、热处理、生产成本等方面，全面进行考虑，才能达到应有的技术经济效果。
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