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Title:Isothermal forging laws on TC6 titanium alloy actuator cylinder under multi-pass loading
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ClassificationCode:TG316
year,vol(issue):pagenumber:2024,49(1):23-31
Abstract:

  The forming paths of single/double/three-pass loading for TC6 titanium alloy actuator cylinder forgings were analyzed. Taking the sharp increase point of load during the forming process of single-pass loading as the transition point, the punch loading speed was changed at this point, and the loading forming rules of the actuator cylinder was studied by double passes and three passes. Furthermore, the forming efficiency was characterized by the ratio of average forming load to forming time, and a better forming path of loading was obtained through comparison to research the forming load value and the material flow law under this loading path. The results show that three paths of multi-pass loading with smaller average forming load and higher forming efficiency are obtained by comparing the forming efficiency. From the perspective of material flow, it is analyzed that when the single pass reduction amount is 13%, the load increases sharply because the horizontal plane at the top of punch begins to contact with the workpiece and the material flow slows down. When the reduction amount is 72%, the load increases because the workpiece begins to contact the bottom of die, a large amount of material continues to flow to the lateral solid bulge, and a small amount of material is back-extruded upward to form the upper end of actuator. Finally, the experimental and simulation verification show that the actuator cylinder forgings is well formed under the double-pass loading path, and the solid bulge at the bottom is fully filled. It is confirmed that the multi-pass loading can exert the superplastic properties of titanium alloy, improve the forming efficiency, and better achieve the precise plastic forming.

 
Funds:
国家自然科学基金资助项目(52005241);江西省自然科学基金资助项目(20232BAB204050);国家留学基金委(No.202208360107)
AuthorIntro:
作者简介:何国云(1998-),男,硕士研究生 E-mail:2430561321@qq.com 通信作者:魏 科(1986-),男,博士,副教授 E-mail:weike@nchu.edu.cn
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