锻压技术

工件底孔直径对冷挤压内螺纹牙高率的影响

英文标题：Effect of workpiece bottom hole diameter on tooth height rate in cold extrusion process of internal thread

作者：侯红玲陈鑫常向龙赵永强吴浪

单位：陕西理工大学

分类号：TG376.3

出版年,卷(期):页码：2021,46(8):231-238

摘要：

为了建立底孔直径和牙高率之间的关系，以40Cr合金钢为研究对象，通过数值模拟分析了挤压过程中挤压扭矩和挤压温度的变化规律，以及底孔直径对内螺纹牙形饱满度和牙高率的影响；利用MATLAB对试验结果进行数据拟合，得到内螺纹牙高率与底孔直径之间的关系式；通过内螺纹冷挤压试验验证了数值模拟结果的可靠性和拟合公式的准确性。研究结果表明：在内螺纹冷挤压初始阶段，挤压扭矩和挤压温度快速上升；在挤压校正阶段，挤压扭矩迅速下降，挤压温度下降较慢。对于M8×1.25 mm的内螺纹，工件底孔直径控制在Φ7.33~Φ7.40 mm时，将挤压后的内螺纹牙高率满足连接强度要求，且底孔直径为Φ7.33 mm时，可以保证内螺纹连接强度为100%的同时降低加工难度，提高挤压丝锥的使用寿命。

In order to establish the relationship between bottom hole diameter and tooth height rate, for 40Cr alloy steel, the change laws of extrusion torque and extrusion temperature during the extrusion process and the influences of bottom hole diameter on the fullness of internal thread and the tooth height rate were analyzed by numerical simulation, and the relationship equation between tooth height rate and bottom hole diameter for internal thread were obtained by MATLAB to fit the test results. Then, the reliability of numerical simulation results and the accuracy of fitting formula were verified by the cold extrusion test of internal thread. The research results show that the extrusion torque and extrusion temperature rise rapidly at the initial stage of cold extrusion for internal thread, and during the extrusion correction stage, the extrusion torque decreases rapidly and the extrusion temperature decreases slowly. For the internal thread with M8×1.25 mm, when the bottom hole diameter of workpiece is controlled at Φ7.33-Φ7.40 mm, the tooth height rate of internal thread after cold extrusion meets the connection strength requirements, and when the bottom hole diameter is Φ7.33 mm, the thread connection strength can be guaranteed to be 100%, while reducing the processing difficulty and increasing the service life of extrusion tap.

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）

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］刘胜，陈启升，王海霞，等. 基于Workbench的曲柄压力机连杆调节螺纹的应力分析
［J］. 锻压技术，2020 ,45(5):153-158.

Liu S，Chen Q S，Wang H X，et al. Stress analysis on connecting rod adjusting thread of crank press based on Workbench
［J］. Forging & Stamping Technology，2020 ,45(5): 153-158.

［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, 2018,52(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. 基于多传感器信息融合的冷挤压内螺纹成形质量预测研究
［D］. 南京：南京航空航天大学,2011.

Zhang M. Research on Quality Prediction of Cold Extrusion Internal Thread Forming Based on Multi-sensor Information Fusion
［D］. Nanjing：Nanjing University of Aeronautics and Astronautics,2011.

［6］马平, 张伯霖,王珉.高强度钢冷挤压内螺纹底孔尺寸的理论计算与实验研究
［J］.机械工程师,1998，(5):11-13.

Ma P, Zhang B L, Wang M. Theoretical calculation and experimental study on the size of internal screw hole in cold extrusion of high strength steel
［J］. Mechanical Engineer,1998，(5):11-13.

［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］Chen J J, Shih Y S. A study of the helical effect on the thread connection by three dimensional finite element analysis
［J］. Nuclear Engineering and Design, 1999, 191(2):109-116.

［9］Lee B Y, Tarng Y S, Lii H R . An investigation of modeling of the machining database in turning operations
［J］. Journal of Materials Processing Technology, 2000, 105(1-2):1-6.

［10］Fromentin G, Gérard P, Moisan A, et al. Precision and surface integrity of threads obtained by form tapping
［J］. CIRP Annals-Manufacturing Technology, 2005, 54(1):519-522.

［11］Pierre Stéphan, 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.

［12］Yang Z J, Tan Q C, E S J，et al. 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.

［13］Pereira I C, Silva M. 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, 2017，93：2357-2368.

［14］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.

［15］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.

［16］刘萌, 王兴国,李雪梅,等.底孔直径对1100铝合金内螺纹冷挤压过程的影响
［J］.轻合金加工技术,2020,48(7):53-57.

Liu M, Wang X G, Li X M, et al. Effect of hole diameter on cold extrusion process of 1100 aluminum alloy internal thread
［J］. Light Alloy Fabrication Technology, 2020,48(7):53-57.

［17］张玉健，张江伟.自动电阻测试仪的设计及其误差处理
［J］.电子测量技术，2012，35(3): 87-89.

Zhang Y J, Zhang J W. Design of automatic resistance tester and its error treatment
［J］. Electronic Measurement Technology, 2012,35 (3): 87-89.

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