The causes of crack for cold-working die are analyzed by checking machining technique and observing the microscopic structure, the technical measures to prevent cracks are put forwarded in the paper.

通过对弯曲件冷冲模各加工工艺和金相显微组织的分析，分析了冷冲模产生裂纹的原因，并提出了防止裂纹产生的工艺措施。

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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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