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钢零件冷挤压的可能性,首先取决于工具的工作条件。在挤压过程中,模具要承受金属的巨大负荷,并在金属流动过程中,经受极大的摩擦力和温度变化的作用。当单位挤压力大于200公斤/毫米~2时,由合金工具钢Cr12MO制成的凹模,其寿命显著下降,使冷挤压过程难于在大量生产条件下得到实现。采用硬质合金来代替一般铬工具钢的凹模锒块,会显著地提高模具工作型腔的寿命。采用硬质合金锒块的予应力组合凹模可提高模具弹性承载能力,充分利用模具材料,是有效、合理而经济的办法。
The possibility of cold extrusion of steel parts first depends on the working conditions of the tool. In the extrusion process, the mold to withstand the huge metal load, and in the metal flow process, subject to great friction and temperature changes. When the unit extrusion pressure is greater than 200 kg / mm ~ 2, the die made of alloy tool steel Cr12MO, its life expectancy decreased significantly, making the cold extrusion process difficult to achieve in a large number of production conditions. The use of hard alloy to replace the common chrome tool steel concave block, will significantly improve the working life of the mold cavity. The use of carbide briquettes pre-stress combination of concave die can increase the elastic modulus of the mold, make full use of mold material, is an effective, reasonable and economical way.