|
摘要：
|
|
为了研究大导程内螺纹的挤压成形过程及挤压丝锥的结构参数对其成形质量的影响，建立了3种头数的挤压丝锥模型，通过数值模拟得到了内螺纹冷挤压过程中的应力分布、金属流动规律以及挤压温度和挤压扭矩，获得了内螺纹成形质量，并通过内螺纹冷挤压试验验证了仿真结果。研究结果表明：内螺纹冷挤压过程中应力主要集中在工件与挤压棱齿接触区域，金属沿挤压棱齿表面流动，逐渐形成螺纹廓形；单头挤压丝锥加工的内螺纹质量最好，挤压温度与挤压扭矩最高；三头挤压丝锥加工的内螺纹质量最差，挤压温度与挤压扭矩最低；双头挤压丝锥兼有单头和三头丝锥的优点，内螺纹加工过程中的挤压温度和挤压扭矩较低，同时内螺纹的成形质量较好，试验结果与数值模拟结果基本吻合。
|
|
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.
|
|
基金项目：
|
|
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）
|
|
作者简介：
|
|
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
|
|
参考文献：
|
[1]Korin I, Ipina J P. Experimental evaluation of fatigue life and fatigue crack growth in a tension bolt-nut threaded connection [J]. International Journal of Fatigue, 2011, 33 (2): 166-175.
[2]张善文, 贺强, 汤淋淋, 等.内螺纹冷挤压丝锥失效试验研究[J].工具技术, 2018, 52(3): 103-106.
Zhang S W, He Q, Tang L L, et al. Failure test of internal thread cold extrusion tap [J]. Tools & Technology, 2008, 52(3): 103-106.
[3]缪宏, 左敦稳, 张瑞宏, 等.工件底孔直径对Q460高强度钢冷挤压内螺纹的影响[J].南京航空航天大学学报, 2012, 44(2): 228-232.
Miao H, Zuo D W, Zhang R H, et al. Effect of workpiece bottom hole diameter on internal thread of Q460 high strength steel cold extrusion [J]. Journal of Nanjing University of Aeronautics and Astronautics, 2012, 44(2): 228-232.
[4]梁瑜轩, 黎向锋, 左敦稳, 等.工件底孔直径对冷挤压内螺纹振动信号的影响 [J].精密成形工程, 2012, 4(2): 10-14，35.
Liang Y X, Li X F, Zuo D W, et al . Effect of bottom hole diameter on vibration signal of internal thread in cold extrusion [J]. Precision Forming Engineering,2012,4(2):10-14，35.
[5]张敏, 黎向锋, 左敦稳, 等. 基于主成分分析的BP神经网络内螺纹冷挤压成形质量预测 [J]. 中国机械工程, 2012, 23 (1): 51-54.
Zhang M, Li X F, Zuo D W, et al. Forming quality forecast for internal threads formed by cold extrusion based on principal component analysis and neural networks [J]. China Mechanical Engineering，2012, 23 (1): 51-54.
[6]Monka P, Monkova K, Modrak V et al. Study of a tap failure at the internal threads machining [J]. Engineering Failure Analysis, 2019, 100: 25-36.
[7]Li Y Y, Zhao S D . Numerical analysis on the key technology in extrusion tapping of internal thread [J]. Advanced Materials Research, 2011, 341-342:436-441.
[8]陈鑫, 侯红玲, 王艳茹, 等. 内螺纹冷挤压成形过程仿真及试验研究[J]. 塑性工程学报, 2020, 27(9): 27-34.
Chen X, Hou H L, Wang Y R, et al. Simulation and experimental study of cold extrusion forming process of internal thread[J]. Journal of Plasticity Engineering, 2020,27 (9): 27-34.
[9]Fromentin G, Poulachon G, Moisan A, et al. Precision and surface integrity of threads obtained by form tapping[J]. CIRP Annals-Manufacturing Technology, 2005, 54(1):519-522.
[10]Stéphan P, Mathurin F, Guillot J. Analytical study of maximal tapping torque during forming screw process[J]. Journal of Materials Processing Technology, 2011, 211(2):212-221.
[11]Yang Z，Tan Q，Shiju E. On-line monitoring of drilling torques of microdrills[J]. Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2004, 218(12), 1735-1740.
[12]Pereira I C, Silva M B D. Study of the internal thread process with cut and form taps according to secondary characteristics of the process[J]. International Journal of Advanced Manufacturing Technology, 2017, 93(5-8): 2357-2368.
[13]Armarego E J A, Chen M N P . Predictive cutting models for the forces and torque in machine tapping with straight flute taps[J]. Cirp Annals, 2002, 51(1):75-78.
[14]Shinbutsu T, Amano S, Takemasu T, et al. Thread rolling and performance evaluations of a new anti-loosening double thread bolt combining a single thread and multiple threads [J]. Procedia Engineering, 2017, 207: 603-608.
[15]计小辈, 王丽敏, 王卓群.多头大导程梯形螺纹数控加工方法研究[J]. 制造技术与机床, 2013, (8): 127-129.
Ji X B, Wang L M, Wang Z Q. Multiple large guide distance of trapezoidal thread CNC machining method[J]. Manufacturing Technology & Machine Tool, 2013, (8), 127-129.
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
