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我厂压铸模制造原工艺流程为:锻造→球化退火→粗加工→调质→精加工→试模→渗氮。用该法制作的模具虽有尺寸准确、加工方便等优点,但是,由于模具基体硬度低(只有28～32HRC),使用寿命受到一定影响。如1E40F汽油机前箱压铸模,其寿命只有3万余件。 为此,我厂于1997年初购进一台国产高压高流率真空气淬炉,用于压铸模的淬火处理。经反复论证,我们将工艺流程更改为:选材→锻造→球化退火
I die casting mold manufacturing process for the original: forging → ball annealing → roughing → quenching and finishing → finishing → nitriding. Although the mold produced by the method has the advantages of accurate size and convenient processing, the service life is affected to a certain extent due to the low hardness of the mold base (only 28 to 32 HRC). Such as 1E40F gasoline engine front box die-casting mold, the life expectancy is only 30,000 pieces. To this end, I plant in early 1997 purchased a domestic high-pressure high-flow rate vacuum gas quenching furnace for quenching die-casting process. After repeated demonstration, we will change the process to: selection → forging → ball annealing