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推压齿轮是WK-4型挖掘机的主要易损件之一,其钢号是ZG35CrMo,调质硬度为HB240～260,一般使用寿命约三个月左右。由于寿命低,严重地影响了矿山生产。为了提高推压齿轮的使用寿命,在厂党委的领导下,我们组织了以工人为主体的“三结合”攻关小组,经过一年多的努力和试件的矿山运转试验鉴定,初步在原铸钢件的基础上改进了热处理工艺,使推压齿轮的使用寿命提高了6倍以上。现将试验情况简单介绍如下:
Pushing gears are one of the main wearing parts of the WK-4 excavator. Its steel grade is ZG35CrMo, and the quenched and tempered hardness is HB240 to 260. The general service life is about three months. Because of its low life, the mine production is seriously affected. In order to increase the service life of push gears, under the leadership of the factory party committee, we organized a “triple joint” team focusing on workers, and after more than one year of hard work and mine operation test appraisal of the test pieces, the original cast steel Based on the parts, the heat treatment process has been improved to increase the service life of the pressing gear by more than 6 times. The experimental situation is briefly described as follows: