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1984年,我厂生产出口割草机曲柄轴。此件为模锻件,模具材料为5CrNiMo钢,硬度要求HRC41～47,模具型腔比较复杂,设计为镶块结构。模具的服役条件苛刻,生产过程中,每副模具平均使用寿命仅1100件左右,多因出现脆裂现象发生早期失效。当时,我们在原工艺指导下进行精心操作,模具检验结果符合技术条件,但一投入使用仍然效果不佳,模具问题成为生产的最大障
In 1984, our factory exported the lawn mower crankshaft. This piece is forgings, the mold material is 5CrNiMo steel, HRC41 ~ 47 hardness requirements, the mold cavity is more complex, the design is inlay structure. Mold service conditions harsh, the production process, the average life of each mold is only about 1100, mostly due to the occurrence of early brittle fracture failure. At that time, we conducted meticulous operation under the guidance of the original process, the results of the mold inspection met the technical conditions, but still ineffective when put into use and the mold problem became the biggest obstacle in production