基于数值模拟的汽车深孔螺母件反挤压冲头磨损性能研究  

Research on wear performance of reverse extrusion punch for automotive deep hole nut based on numerical simulation

作　　者：张宇杭 张甲瑞[1] Zhang Yuhang;Zhang Jiarui(College of Intelligent Manufacturing and Automobile,Chongqing Technology&Business Institute,Chongqing 401520,China)

机构地区：[1]重庆工商职业学院智能制造与汽车学院,重庆401520

出　　处：《锻压技术》2022年第2期180-185,共6页Forging & Stamping Technology

基　　金：重庆市教育委员会科学技术研究项目(KJQN202104013);重庆自然科学基金资助项目(cstc2020jcyj-msxmX0940)。

摘　　要：针对某深孔螺母零件一次挤压成形过程中出现的冲头磨损严重、更换频繁、报废率高的问题,提出了在冲头表面涂层,同时改进冲头结构,以达到冲头磨损最小化的目的。基于数值分析软件DEFORM-3D,建立了冲头磨损模型及挤压仿真模型,研究了未涂层冲头、单一涂层冲头和不同膜厚的TiN-TiCN复合涂层冲头在挤压过程中的磨损情况,并采用正交试验法对关键冲头参数进行优化。结果表明:未涂层冲头磨损最为严重,膜厚为4μm的TiN-TiCN复合涂层冲头的磨损最小;当冲头前角为8°、过渡角为33°、圆角半径为0.2 mm、头部外径为Φ19.46 mm时,冲头的磨损量最小。经实际验证,采用涂层技术及最优参数的冲头,其使用寿命提高了5.5倍。For the problems of serious wear, frequent replacement and high scrap rate of punch during one-time extrusion forming process of a deep hole nut parts, the coating on the punch surface and the improvement of punch structure were proposed to minimize the punch wear, and based on the numerical analysis software DEFORM-3 D, the wear model of punch and the extrusion simulation model were established. Then, the wear conditions of uncoated punch, single-coated punch and TiN-TiCN composite coating punch with different film thicknesses during the extrusion process were studied, and the important parameters of punch were optimized by orthogonal test method. The results show that the wear of uncoated punch is the most serious, and the wear for TiN-TiCN composite coating punch with the film thickness of 4 μm is the smallest. When the front angle of punch is 8°, the transition angle is 33°, the fillet radius is 0.2 mm and the outer diameter of head is Φ19.46 mm, the wear amount of punch is the smallest. It has been proved that the service life of punch with coating technology and optimal parameters is increased by 5.5 times.

关 键 词：冲头磨损 深孔螺母件 复合涂层 磨损模型 磨损量 

分 类 号：TG376.3[金属学及工艺—金属压力加工]