Transactions of Materials and Heat Treatment

Title：Cold extrusion process and concentricity analysis on hollow hexagonal flange bolts

Authors： Zhu Jingqiu Zhang Dongmin Lyu Leilei Zhou Weimin

Unit： Shanghai Institute of Technology Shanghai Dongfeng Automobile Special Parts Co. Ltd.

KeyWords： hollow hexagonal flange bolt cold extrusion reverse extrusion punch structure concentricity

ClassificationCode：TG376

year,vol(issue):pagenumber：2020,45(3):70-76

Abstract：

The flow law of internal mass points and the structural characteristics of hollow hexagonal flange bolts during reverse extrusion were analyzed, its main feature was to form deep holes with a hole diameter ratio of 6.5 on the premise of ensuring the concentricity of 0.2 mm, and the four-station cold extrusion process was preliminarily designed. Then, the pre-forming process of deep hole in step 3 was studied by DEFORM-3D, and four points were selected in the rigid translation area to study the influences of four punch structures such as conical punch, conical punch with flat bottom, ball head and flat bottom on the concentricity of deep holes by point tracking method and on the radial offset of selected points was taken as the evaluation criterion. At the same time, compared with the metal flow and the travel load in the initial stage of forming, the comprehensive results show that the conical punch gets good metal streamline under lower forming load, which is conducive to improving the concentricity of parts. Finally, the full-formed and defect-free parts with concentricity meeting the design requirements are produced by JBF-19B-4S bolt cold heading machine, which provides a reference for cold extrusion forming of deep-hole parts.

Funds：

企业横向项目(J2017-184)

朱景秋(1994-)，男，硕士研究生 E-mail：1210550874@qq.com 通讯作者：张东民(1968-),男，博士，教授 E-mail: dmzhang_nuaa@sit.edu.cn

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