车架纵梁冲裁工艺改进及数值模拟

发布时间：2018-05-29 04:02

本文选题：汽车纵梁 + 振动　；参考：《青岛理工大学》2017年硕士论文

【摘要】：汽车纵梁冲裁加工,不可避免的伴随着冲击和振动,连续的振动会使人精力分散,而且影响机床相关部件的使用寿命,造成工件定位不准,影响零件加工质量,产生严重噪声污染。针对卡车纵梁冲裁过程中振动问题,本文立足于公司生产实际,分析了单个孔在冲裁过程中的受力分布规律,并得出单孔冲裁力从开始快速上升到突破材料的屈服极限后快速下降的力学规律曲线。根据单孔受力特点,提出卡车纵梁阶梯冲裁理论,即将整体冲裁过程分解为4-7级台阶冲裁过程。针对4级台阶和7级台阶的布置情况,进行了分析对比并对试验结果进行了振动测量,结果表明七级台阶布置,可以将整体冲裁载荷在各个台阶分布的更均匀,并降低峰值载荷。通过对台阶布置前后的压力机滑块进行有限元分析看出,滑块的等效应力和变形情况均有所降低,对设备起到了较好的保护作用。文章最后,为提升冲头在落冲过程的使用寿命,针对冲头不同的失效模式,重点研究了冲头的表面性能改良PVD涂层技术。经对涂层基本力学性能、显微形貌、耐磨性、断裂韧性及工业使用效果详细分析后,选择出最适合冲头加工条件的涂层,最优化的提高冲压模具的使用寿命。
[Abstract]:Automobile longitudinal beam blanking is inevitably accompanied by shock and vibration, continuous vibration will make people scattered energy, and affect the service life of machine tool components, resulting in inaccurate positioning of the workpiece, and affect the quality of parts processing. Produce serious noise pollution. Aiming at the vibration problem of truck longitudinal beam during blanking, based on the production practice of the company, this paper analyzes the stress distribution law of a single hole in the process of blanking. The mechanical law curve of the single hole punching force from the beginning to the breaking through the yield limit of the material is obtained. According to the stress characteristics of single hole, the stepped blanking theory of truck longitudinal beam is put forward, that is, the whole blanking process is decomposed into 4-7 step blanking process. According to the arrangement of four steps and seven steps, this paper analyzes and compares the test results and measures the vibration results. The results show that the layout of the seven steps can distribute the whole blanking load more evenly in each step. The peak load is reduced. Through the finite element analysis of the press slider before and after the step arrangement, it can be seen that the equivalent stress and deformation of the slider have been reduced, which has played a better protective role to the equipment. Finally, in order to improve the service life of punch in the process of blanking, aiming at different failure modes of punch, the surface properties of punch modified PVD coating technology are studied emphatically. After the detailed analysis of the basic mechanical properties, micromorphology, wear resistance, fracture toughness and industrial application effect of the coating, the coating which is most suitable for the processing conditions of the punch is selected, and the service life of the stamping die is optimized.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U466;TG386.2

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