异形轴套冷挤压成形数值模拟及工艺优化研究

发布时间：2018-02-06 01:42

本文关键词： 异形轴套冷挤压数值模拟模具设计塑性成形　出处：《重庆理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：异形轴套的传统制造模式多以机械加工、特种加工等方式获得,其材料的利用率、生产效率低,产品力学性能不高,不能很好的满足产品使用要求。体积成形、特别是冷挤压成形能够有效提高生产效率,提高材料利用率,获得表面质量好,尺寸精度高,力学性能好的产品零件而被广泛应用于工业生产中。本文采用冷挤压成形技术对异形轴套的成形进行数值模拟及工艺优化研究。本文通过对异形轴套件的结构形状及成形难度的分析研究,根据产品技术要求和结构特点,设计出了挤压件的精华毛坯。通过分析计算异形轴套挤压件的轴向断面面积和径向断面面积分布变化,得出该零件在挤压成形时,材料不仅在其轴向和径向有流动,同时还在轴向方向有材料的再分配流动,成形难度大,为此在制件的成形中增加预制坯工序和预成形工序。本文以不同的预制坯结构形状设计了三种成形工艺方案,制定出冷挤压成形工艺路线,并对所设计的三种成形方案进行工艺计算,确定异形轴套冷挤压用的设备。运用DEFORM-3D有限元模拟软件对异形轴套冷挤压成形工艺方案中的预成形工序进行数值模拟,重点分析预成形过程中坯料的成形情况、速度场、温度场、等效应力场、等效应变场和成形载荷等情况,观察成形过程中可能产生的缺陷形式和原因。通过对模拟结果比较分析表明成形工艺方案三为最优,本文确定异形轴套冷挤压成形采用工艺方案三,即复合挤压预制方孔坯、预成形和终成形,对所确定工艺方案的预制坯和终成形工序的成形过程进行有限元模拟分析,观察其成形过程中各物理场的分布情况,并对终成形中凸模的摩擦磨损进行了模拟分析,优化了终成形的挤压速度和摩擦因数。最后根据本文提出的异形轴套冷挤压成形工艺方案,设计了相应工序的冷挤压模具,为异形轴套的工业化生产提供理论依据支持和相应的实际应用方案。
[Abstract]:The traditional manufacturing mode of special-shaped shaft sleeve is mostly obtained by machining and special processing. Its material utilization efficiency is low the mechanical properties of the product is not high and it can not meet the requirements of product use and volume forming. Especially, cold extrusion can effectively improve the production efficiency, improve the material utilization ratio, obtain good surface quality and high dimensional accuracy. Products with good mechanical properties are widely used in industrial production. In this paper, the numerical simulation and process optimization of shaped shafting are carried out by using cold extrusion forming technology. In this paper, the structure and shape of special-shaped shafts are studied by means of the structure of special-shaped shafts. Analysis and study of the shape and forming difficulty. According to the technical requirements and structural characteristics of the product, the essence blank of the extruded parts is designed. The axial and radial sectional area distribution of the extruded parts with special-shaped sleeve is calculated by analyzing and calculating. It is concluded that the material flows not only in the axial and radial direction, but also in the axial direction when the material is extruded, so it is difficult to form. For this reason, preform and preform processes are added to the forming process of the parts. In this paper, three kinds of forming process schemes are designed according to different preform structure shapes, and the cold extrusion forming process route is worked out. The process calculation of the three kinds of forming schemes is also carried out. The equipment for cold extrusion of special-shaped shaft sleeve was determined. The preforming procedure in the cold extrusion process of special-shaped shaft sleeve was simulated by using DEFORM-3D finite element simulation software. The forming condition, velocity field, temperature field, equal effect force field, equivalent strain field and forming load are analyzed in detail. Through the comparison and analysis of the simulation results, it is shown that the forming process plan 3 is the best. In this paper, the special shape shaft sleeve cold extrusion process is determined to adopt process plan three. That is, preforming and final forming of prefabricated square hole billet by composite extrusion, finite element simulation analysis of the preform and final forming process of the determined process plan is carried out, and the distribution of each physical field during the forming process is observed. The friction and wear of die in final forming are simulated and analyzed, the extrusion speed and friction coefficient of final forming are optimized. Finally, according to the cold extrusion process of special-shaped shaft sleeve proposed in this paper. The cold extrusion die of the corresponding working procedure is designed, which provides the theoretical basis and the corresponding practical application scheme for the industrial production of the special-shaped shaft sleeve.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG376

【共引文献】