Transactions of Materials and Heat Treatment

Title：Research on wear failure for pre-forging die of piston

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ClassificationCode：TG376.2

year,vol(issue):pagenumber：2021,46(3):21-26

Abstract：

In order to improve the punch life of pre-forged piston in actual production and the accuracy of predicted results, the pre-forging process of piston was numerically simulated, and based on the Archard modified wear model, the cause of wear in the area where the sampling points were selected for pre-forging punch of piston was analyzed theoretically. Then, the most severely wear area of sampling points for punch was analyzed parametrically by orthogonal test, and the piston was pre-forged for twenty times continuously to establish a fitting formula. The results show that during the pre-forging process, the forming accuracy and quality of piston meet the production requirements, and the most severely wear area of punch is at the transition position of punch fillet. At this position, the best combination of factors affecting the punch wear depth is that: the preheating of punch temperature is 200 ℃, the friction coefficient is 0.35, the punch hardness is 60 HRC and the pressing speed is 10 mm·s-1. It can be seen from the results of twenty times for pre-forging that the single wear amount curve of piston punch does show a nolinear relationship, and the life of pre-forging punch for piston is 22186 times by establishing the equation between the average wear amount of twenty times and the punch life. Combining the prediction results, the test data on the actual production site are revised, which has a certain guiding effect on the actual production.

Funds：

河南省科技攻关重点项目（12210210175）

齐双强（1974-），男，学士，讲师 E-mail：3450423480@qq.com

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