摘要
为了提高螺纹的成形质量,借助有限元模拟和试验相结合的方法,对影响内螺纹冷挤压成形的关键工艺参数工件底孔直径进行了研究。采用数值模拟的方法研究了工件底孔直径与加工过程中最高挤压温度、最大挤压扭矩之间的关系,获得4种底孔直径下挤压温度、扭矩的变化曲线与成形后螺纹的牙形状况。通过试验对挤压后的内螺纹牙高、表层形貌进行了检测,同时对数值模拟得到的牙形结果进行了验证。数值模拟与试验结果表明,挤压过程中的扭矩与温度随着工件底孔直径的增大而减小,成形后的螺纹牙高同样随着底孔直径的增大而减小。对于42CrMo4钢材冷挤压M22×2的内螺纹,在保证螺纹的连接强度的条件下,为了降低挤压过程中的温度与扭矩,预制工件底孔直径选择应选择φ21.15~φ21.20mm。
In order to improve the forming quality of thread,the diameter of bottom hole,which is the key process parameter of cold extrusion forming of internal thread,is studied by means of finite element simulation and experiment.The relationship between the diameter of the bottom hole and the maximum extrusion temperature and maximum extrusion torque in the machining process is studied by means of numerical simulation,and the variation curves of extrusion temperature and torque under four kinds of bottom hole diameter and the tooth shape of the formed thread are obtained.The height of the inner thread tooth and the surface morphology of the extruded tooth are tested through the experiment,and the tooth shape results obtained by numerical simulation are verified at the same time.The numerical simulation and experimental results show that the torque and temperature in the extrusion process decrease with the increase of the bottom hole diameter of the workpiece,and the thread height decreases with the increase of the bottom hole diameter.For the cold extruded M22×2 internal thread of 42CrMo4 steel,under the condition of ensuring the connection strength of the thread,in order to reduce the temperature and torque in the extrusion process,the diameter of the bottom hole of the prefabricated workpiece should be selected as φ21.15~φ21.20mm.
作者
蒋宇翔
何强
周宏根
符博峰
赵明
杨平
Jiang Yuxiang;He Qiang;Zhou Honggen;Fu Bofeng;Zhao Ming;Yang Ping(College of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu 212003,China;不详)
出处
《工具技术》
北大核心
2023年第1期66-70,共5页
Tool Engineering
基金
国家青年科学基金(51605207)
江苏省青年科学基金(BK20160563)。
关键词
内螺纹
冷挤压
数值模拟
挤压扭矩
挤压温度
internal thread
cold extrusion
numerical simulation
extrusion temperature
extrusion torque
