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Abstract：
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In order to study the extrusion forming process of large-lead internal thread and the influences of the structural parameters for extrusion tap on its forming quality, three kinds of extrusion tap models with different tap numbers were established, and the stress distribution, metal flow law, extrusion temperature and extrusion torque in the process of cold extrusion for internal thread were obtained by numerical simulation. Then, the forming quality of internal thread was obtained, and the simulation results were verified by the cold extrusion test of internal thread. The research results show that the stress is mainly concentrated in the contact area between workpiece and extruded teeth during the cold extrusion of internal thread, and the metal flows along the surface of extruded teeth gradually forms the thread profile. Furthermore, the internal threads processed by the single-head extrusion tap have the best quality, and the extrusion temperature and extrusion torque are the highest. However, the internal threads processed by the triple-head extrusion tap have the worst quality, and the extrusion temperature and extrusion torque are the lowest. Thus, the double-head extrusion tap has the advantages of both single-head and triple-head taps, the extrusion temperature and extrusion torque during the processing of internal threads are low, and the forming quality of internal threads is better. Finally, the test results are basically in agreement with the numerical simulation results.
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Funds：
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陕西省自然科学基础研究计划项目(2019JM-466)；陕西省教育厅专项科研计划项目(18JK0148)；陕西理工大学研究生创新基金资助项目（SLGYCX2027）
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AuthorIntro：
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作者简介：侯红玲（1976-），女，博士，教授，E-mail：xjtuhhl@163.com；通信作者：赵永强（1976-），男，博士，教授，E-mail：zyq0620@163.com
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Reference：
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