Transactions of Materials and Heat Treatment

Title：Cold upsetting-extruding process for combination piston-pins

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ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(1):109-113

Abstract：

For structural characteristics and process requirements of combination piston-pins, its forming difficulties were analyzed as the extruding of tapered holes at both ends and the backward extrusion of central circular hole with a ratio of depth to diameter more than 2.5, and the cold upsetting-extruding process of combination piston-pins with seven steps was simulated and analyzed by finite element analysis software DEFORM-2D. Through the numerical simulation analysis and the revision of the process scheme, the final forming process scheme was determined as blanking-sizing-upsetting-backward extrusion-piercing-the first extruding taper holes-the second extruding taper holes, and the backward extrusion punch was made of YG15 cemented carbide to avoid breakage where the cross section of punch changed in the backward extrusion. Using the final process scheme for production experiment, the experiment result shows that the combination piston-pin meets the design requirements of part without forging defects such as fold and crack, and the backward extrusion punch of deep hole has a service life of more than 80000 pieces.

Funds：

重庆市基础科学与前沿技术研究专项基金资助项目（cstc2017jcyjAX0175）

作者简介：隋毅（1981-），男，硕士，工程师 E-mail：suiyi_1981@qq.com

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