锻压技术

滑动叉热锻模失效分析和解决措施

英文标题：Failure analysis and solution measures of sliding fork hot forging die

作者：程俊伟1 谷刘磊1 陈喜乐2 刘其勇2

分类号：TG306

出版年,卷(期):页码：2023,48(12):212-216

摘要：

热锻模具在工作过程中承受交变的热应力和机械应力的综合作用，易因磨损、开裂和塑性变形等失效。针对某型号滑动叉热锻模寿命低的问题，根据其失效形式分析了失效的主要原因，发现终锻模的失效部位主要在冲孔凸台端面，热裂纹呈放射状，冲孔凸模具有一定程度的塑性弯曲。理论分析和数值模拟结果显示，冲孔凸模的端面因长时间接触炽热的坯料而导致温度升高，其强度和刚度降低，且长时间在热应力和接触应力的共同作用下，端面产生裂纹，并发生一定程度的弯曲。通过控制坯料的镦粗量、提高凸台的刚性、优化冲孔凸台的高度、改善材料流动的合理性，以及使用3D打印技术并采用红硬性高的材料制造冲孔凸台，使模具寿命得到了明显提高。

The hot forging die is subjected to the combined action of alternating thermal stress and mechanical stress during the working process, and it is prone to failure due to wear, cracking and plastic deformation.Aiming at the problem of low service life of hot forging die for a certain type of sliding fork, the main causes of failure were analyzed according to its failure modes. It is found that the failure position of final forging die is mainly on the end face of punching boss, the hot crack is radial, and the punching boss has a certain degree of plastic bending.Theoretical analysis and numerical simulation results show that the long-term contact of the end face of the punching punch with the hot blank leads to an increase in temperature and a decrease in strength and stiffness. Under the combined action of thermal stress and contact stress for a long time, the end face cracks and bends to a certain extent. By controlling the upsetting amount of blank, improving the rigidity of boss, optimizing the height of punching boss, the rationality of material flow,and using the 3D printing technology and the material with high hot hardness to manufacture the punching boss, the die life is significantly improved.

基金项目：

材料成形与模具技术国家重点实验室开放课题研究基金 ( P2019-016 )；河南省高等学校重点科研项目计划（17A460027）

作者简介：程俊伟（1973-），男，博士，教授 E-mail：hustcjw@163.com

参考文献：

[1]肖宜仰, 刘宗江, 王超, 等. 陈荣标高端机胀断连杆模具寿命提升研究与应用[J]. 锻压装备与制造技术, 2023, 58(2): 97-99.

Xiao Y Y, Liu Z J, Wang C, et al. Research and application on improving the service life of expansion and fracture connecting rod die for high-end machine[J]. China Metalforming Equipment & Manufacturing Technology, 2023, 58(2): 97-99.

[2]章程军, 汪远清. 阀门锻件热锻模具失效原因分析及改进措施[J]. 阀门, 2023, (1):76-79.

Zhang C J, Wang Y Q. Failure analysis of hot forging die for valve forgings and improvement measures[J]. Valve, 2023, (1):76-79.

[3]郭艳珺, 程俊伟,常世超, 等. 短轴滑动叉模锻工艺[J]. 塑性工程学报, 2022, 29(4):45-50.

Guo Y J, Cheng J W, Chang S C, et al . Die forging process of short shaft sliding fork[J]. Journal of Plasticity Engineering, 2022, 29(4):45-50.

[4]包卫平. 热锻模的典型失效形式及其原因分析[J]. 锻造与冲压, 2020，(5): 28, 30-32.

Bao W P. Typical failure forms and cause analysis of hot forging dies[J]. Forging & Metalforming, 2020，(5): 28, 30-32.

[5]赵中里, 薛勇杰, 吴大鸣, 等, 热锻模高温摩擦磨损探讨及对策[J]. 模具工业, 2021, 47(5):1-5.

Zhao Z L,Xue Y J, Wu D M, et al, High temperature friction and wear behavior of hot forging die and its countermeasures[J]. Die & Mould Industry, 2021, 47(5):1-5.

[6]袁开波, 马宏辉, 高俊丽. 热锻模使用寿命的探讨[J]. 模具制造, 2013, (6):91-93.

Yuan K B, Ma H H, Gao J L. Discussion of service life for the hot forging die[J]. Die & Mould Manufacture, 2013, (6):91-93.

[7]鲁建飞. 热锻模的循环应力分析与疲劳寿命预测[D]. 武汉: 武汉理工大学, 2014.

Lu J F. Cycle Stress Analysis and Fatigue Life Prediction of Hot Forging Die[D]. Wuhan: Wuhan University of Technology, 2014.

[8]Kang J H, Park I W, Jae J S, et al. A study on a die wear model considering thermal softening: Construction of the wear model[J]. Journal of Materials Processing Tech., 1999，96 (1/3) : 53-58.

[9]吴彭添, 廖德侃. 锻造模具失效分析及成本降低办法研究[J]. 锻造与冲压, 2022, (23):67-70.

Wu P T, Liao D K.Failure analysis of forging dies and research on cost reduction methods[J]. Forging & Metalforming, 2022, (23):67-70.

[10]Wang H J, Wu Y Z, Wang H C, et al. Design method and verification for long life hot forging die[J]. Materials Research Innovations, 2011, 15 ( s1):377-380.

[11]王华君, 饶润胤, 刘维, 等. 多层金属平板模具热-力载荷分析方法的对比研究[J]. 塑性工程学报, 2019, 26(4):274-279.

Wang H J，Rao R Y，Liu W，et al． Comparison research on analysis methods of thermo-mechanical loading for multi-layer metallic flat die[J]. Journal of Plasticity Engineering, 2019, 26(4):274-279.

[12]Bistron M, Behrens B A, Paschke H. Reduction of wear by boron based multilayer coatings on forging dies[J]. Steel Research International, 2010, 81(9) : 290-293.

[13]翟万略. 基于3D打印的模具修复技术探讨[J]. 航空制造技术, 2014, (9):46-49.

Zhai W L. Discussion of mould repair technology based on 3D printing[J]. Aeronautical Manufacturing Technology, 2014, (9):46-49.

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