Transactions of Materials and Heat Treatment

Title：Extrusion of fixed-mandrel piercing with external hydraulic fixation for seamless aluminum tube

Authors： Xie Donggang Zhang Jun Hou Yongchao Yang Jian Yang Hongjuan

Unit： China National Heavy Machinery Research Institute Co. Ltd. State Key Laboratory of Metal Extrusion and Forging Equipment Technology

KeyWords： seamless aluminum tube double action extrusion press fixed-mandrel piercing piercing system piercing mandrel

ClassificationCode：TG372

year,vol(issue):pagenumber：2016,41(11):82-87

Abstract：

The extrusion features of fixed-mandrel piercing for seamless aluminum tube were analyzed, and its process was put forward based on the curve of piercing force on the mandrel and extrusion route. Then, different fixed-mandrel structures of piercing were introduced, a new structure of fixed-mandrel piercing with external hydraulic fixation was proposed, and its advantages were analyzed. The control method combining proportional relief valve with high frequency sound proportional valve was given. The research result shows that the precision of the fixed needle can be controlled within ±1 mm, and the extrusion test of large seamless aluminum tube was conducted on the 125 MN double action extrusion press by hydraulic transmission based on the above research result. The actual curves of piercing force on the mandrel and extrusion route were drawn. The test data are consist with the research result.

Funds：

国家科技重大专项(04专项) (2009ZX04005-031, 2011ZX04016-081)；陕西省重点科技创新团队(2013KCT-10)

谢东钢（1956-），男，硕士，教授级高工张君（1970-），男，博士，教授级高工

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