Properties and types of cold working die steel were summarized, and the disadvantages of traditional cold working die steels and advantages of new cold working die steels were put forward.

综述了冷作模具钢的性能及分类，指出了传统冷作模具钢的局限性和新型冷作模具钢的优势。

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The effect of blank quality in cold extrusion on the damage way and service life of working parts (mould and die)is analysed, and some countermeasures presented.

分析了冷挤压毛坯质量对模具的工作部分（上、下凸模和凹模）的损坏形式和寿命的影响，指出了保证毛坯质量应采取的措施。

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Three heat transfer mathematical models are given based on working condition of horizontal cold chamber die casting machine.

针对卧式冷室压铸机压室的工作环境，提出三种不同的热传递数学模型。

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