Transactions of Materials and Heat Treatment

Title：Design on forging die for three-cylinder crankshaft based on Deform

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ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(1):161-167

Abstract：

Based on the analysis of structural characteristics for three-cylinder crankshaft of 42CrMo steel, the dressing structure of pre-forgings was optimized by software Deform, the dressing contour was changed from the straight line intersection to the arc transition, and the intersection angle was optimized from 15° to 20° to reduce the stress value of die cavity. Furthermore, the remaining block structure was designed in order to facilitate deformation, mold splitting and subsequent counterweights, the semi-open and semi-closed extrusion barrel structure was designed at the edge of pre-forging die, the pre-forging and final forging deformation amounts were distributed, and the pre-forging and final forging die structures were obtained. Finally, the forming processes of pre-forging and final forging were numerical simulated by Deform-3D respectively, and the flash values of pre-forgings and final forgings were 15-55 mm and 35-65 mm respectively, which was 5 mm smaller than the measured values. In addition, the pre-forging temperature of forgings was designed to be 1200 ℃, and the temperature at the end of final forging was over 900°. The production practice shows that the simulation results can assist the structural design of the forging die, the flash of forgings is uniform, the die cavity is filled fully, and the final forgings meet the technical requirements of drawing and acceptance criteria.

Funds：

国家自然科学基金资助项目（51575406）；武汉工程大学科学研究基金项目（K201804）

作者简介：徐华（1979-），男，学士，工程师 E-mail：78281063@qq.com 通信作者：胡双锋（1981-），男，硕士，讲师 E-mail：254117912@qq.com

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