Transactions of Materials and Heat Treatment

Title：Optimization on precision forming steps for elbow joint forgings

Authors： Si Qingyang Sun Qian Yang Wenyu Hao Xiaoxia

Unit：

KeyWords：

ClassificationCode：TG316

year,vol(issue):pagenumber：2021,46(9):294-298

Abstract：

According to the structural characteristics of insert die for 6.3 MN friction press, without adding additional dies and fire cycles, the bending step was added before the die forging of elbow joint forgings to increase the material utilization rate of forgings to about 80%, and through numerical simulation and process test, the application of bending die cavity in the elbow joint forgings was studied. Then, the structure forms and key parameters of the design of bending die cavity for elbow joint forgings were summarized, and the reasons why the flash junction part of blank after bending was easy to have folding defect during the die forging were analyzed. However, the folding defect of die forging was avoided only when the distance between the contour of bending die cavity and the outer contour of forgings met h4≥2h2, and the step position was smoothly transitioned with large fillet. The application results show that even if the production equipment has limitations, the precision forming of elbow joint forgings for titanium alloy, stainless steel and other materials can be realized in one fire by this method.

Funds：

斯庆阳（1984-），男，本科，工程师 E-mail：66437814@qq.com

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