Transactions of Materials and Heat Treatment

Title：Failure mechanism of large-end keyway hole in push rod of a six-link press

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ClassificationCode：TG315.5

year,vol(issue):pagenumber：2025,50(8):216-224

Abstract：

For the problem that the push rod of multi-link press was prone to fatigue damage in the practical application, the force conditions and fatigue characteristics of the push rod were analyzed, and an optimization design was carried out based on the analysis results. First, a dynamic model of the press linkage mechanism was established based on the D′Alembert principle, and the force conditions of the push rod during the working cycle were analyzed. Then, combined with the load spectrum of the push rod under the actual working conditions, the fatigue life was comprehensively analyzed and predicted by using stress-life(S-N) curve and Goodman correction equation. Furthermore, on this basis, BOBYQA algorithm was used, combined with finite element analysis and fatigue life prediction model, the optimization design of the push rod based on fatigue life was conducted. Finally, for the push rod of a 6300 kN six-link press, the effectiveness of the optimization design was verified. The case analysis shows that the fatigue life of the optimized push rod is significantly improved, providing a scientific basis for the performance improvement and maintenance strategies of the multi-link press.

Funds：

江苏省产学研合作项目（BY20221099）；扬州市科技计划项目（YZ2024225）

作者简介：牛瑞霞（1988-），女，硕士，高级工程师 E-mail：nrx886@126.com 通信作者：谷晓妹（1978-），女，硕士，实验师 E-mail：184441257@qq.com

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