With the progress of demand for plastic products and the expansion of application fields, higher and higher requirements are put forward for plastic molds, which promotes the continuous development of plastic molds, and also drives the rapid development of plastic mold steel. The main performance is that the development of plastic mold steel is accelerated, and the varieties are increasing rapidly. But at present, plastic mold materials are still mainly steel.

⒈塑料模具的工作条件

1. Working conditions of plastic mould

塑料模具按照成型固化不同能够分为热固性成型塑料模和热塑性成型塑料模。热固性成型塑料模，如压塑模，工作时塑料呈固态粉末料或预制坯料，参加型腔并在必定温度下经热压成型。热塑性成型塑料模，如打针模、揉捏模，工作时塑料在粘流状态下经过打针、揉捏等方法进入型腔并加工成型。

Plastic mold can be divided into thermosetting plastic mold and thermoplastic plastic mold according to different curing. Thermosetting molding plastic mold, such as compression mold, when working, the plastic is solid powder or preform, participates in the cavity and is hot pressed at a certain temperature. Thermoplastic molding plastic mold, such as injection mold, kneading mold, plastic in viscous flow state through injection, kneading and other methods into the cavity and processing molding.

⒉塑料模具的失效分析

2. Failure analysis of plastic mould

⑴磨损失效；⑵塑性变形失效；⑶断裂失效

(1) wear failure; (2) plastic deformation failure; (3) fracture failure

⒊塑料模具资料的功能要求

3. Functional requirements of plastic mold data

⑴塑料模具资料的使用功能要求

(1) functional requirements of plastic mold data

①较高的硬度和耐磨性；②必定的耐热和耐蚀性；③杰出的尺度稳定性；④杰出的热导性 。

① High hardness and wear resistance; certain heat resistance and corrosion resistance; excellent dimensional stability; excellent thermal conductivity.

⑵塑料模具资料的工艺功能要求

(2) process function requirements of plastic mold data

①杰出的切削加工性；②杰出的冷压成型性；③热处理工艺性；④焊接功能

① Excellent machinability, excellent cold pressing formability, excellent heat treatment technology, excellent welding function

据统计，我国的塑料模用钢已占全部模具钢的一半以上。合理地挑选塑料模具钢及热处理工艺 对确保塑料模具质量，进步塑料模具使用寿数和降低出产成本具有重要作用。

According to statistics, China's plastic mold steel has accounted for more than half of all mold steel. Reasonable selection of plastic mold steel and heat treatment process plays an important role in ensuring the quality of plastic mold, improving the service life of plastic mold and reducing the production cost.