【作者】 陈海涛；

【导师】 魏修亭；

【作者基本信息】 山东理工大学 ， 机械电子工程， 2012， 硕士

【摘要】 车轮是汽车行驶系统中重要的安全部件之一,对整车安全性和可靠性有着重要的影响。重型钢制车轮结构复杂、壁厚变化不规则、成形载荷大,在体积成形过程中易出现断裂、起皱等现象。传统的车轮成形工艺研究方法“试错法”凭借经验确定成形工艺参数,存在盲目性大、研发周期长、实验费用高等弊端。由于现有技术条件的限制,仅仅依靠理论分析或实验研究比较困难。本文采用有限元技术,对重型钢制车轮的成形工艺过程、轮辐旋压加工、轮辋滚压加工等进行分析研究,主要开展了以下三方面研究工作。在分析研究重型钢制车轮结构与成形工艺的基础上,针对传统成形工艺过程中存在的工序繁琐、加工效率低等现状,提出了基于DEFORM-3D软件的成形工艺数值仿真方法,为工艺设计、实验研究提供了有效手段。基于数值仿真结果,对轮辐旋压和轮辋滚压提出了新的改进工艺,可有效提高产品质量、缩短产品研发周期。从旋压加工的理论和实际出发,对重型钢制车轮轮辐的传统成形工艺方案进行了研究,将轮辐母线分为曲母线段和直线段分别进行处理,提出了错距旋压的新方案。将轮辐曲母线段离散成一系列小曲线段,利用线性逼近的思想,用小直线段替代小曲线段,则曲母线段旋压可看作无数个锥形段旋压的集合；轮辐直线段为筒形件旋压。基于上述模型,可以得到轮辐旋压变形过程中的成形规律。在数值模拟的基础上,采用正交试验法进行工艺参数优化设计,分析各种参数对旋压力及工件质量的影响,得到一组优化的工艺参数。在详细分析轮辋滚压成形工况的基础上,提出了“轮辋滚压一次成形”的工艺改进方案。根据轮辋滚压一次成形工艺方案,使用DEFORM-3D软件对轮辋滚压过程进行数值仿真,研究合理的轮辋一次滚压成形的加工参数。仿真结果表明,本文建立的轮辋滚压过程仿真建模方法及其一次成形工艺是可行的。利用正交试验法进行工艺参数优化设计,得到一组优化的工艺参数,为轮辋滚压一次成形提供了理论依据。更多还原

【Abstract】 Wheel is one of the most important safety parts in vehicle running system. The heavy steel wheel quality greatly affects the security and reliability of the car. Due to the complicated structure, irregular wall-thickness, large forming load, some shortcomings such as tension fracture and crinkle always emerge in the process of molding. The traditional wheel forming process research method" trial and error" relies on experience to determine the process parameters. But it has many disadvantages, such as the blindness in design, the long period, the high cost and so on. It is very hard to clearly understand the forming and process, only depending on theoretical analysis and experimental study. In this paper, the forming process of steel wheel, spinning forming of spoke and roller forming of rim have been analyzed by finite element technology, and the main works having been carried out are as follows:Based on study of steel wheel structure and forming process, on the question of complicated process, low processing efficiency in forming process, the paper proposes forming process numerical simulation method based on DEFORM-3D software for process design and experimental research. Based on the numerical simulation results, the spokes and rim rolling spinning a new improvement process, which can effectively improve the quality of products, shorten the product development cycle.From the spinning processing of theory and reality, the traditional forming process of steel wheel spoke were studied. The curve segment and straight segment of spoke’s generatrix have been treated respectively, and stagger spinning has been putted forward. The curved generatrix has been divided into many small sections. With small straight segments instead of curve segment, using the Linear approximation of the thought, curved generatrix can be regarded as set of innumerability conical sections and followed the sine law in generally; The straight section of the spoke belongs to the spinning of tube-spinning. Based on the model established above, the distribution and variation features of the stress and strain during outside spinning of deformation have been obtained. The appropriate process parameters have been selected by basing on the results of the numerical simulation. And analyze the influence of the parameters on spinning force and blank quality; finally obtain a set of optimum process parameters.On the basis of the detailed analysis of the wheel rim roll forming condition and put forward the improvement proposal:the wheel rim rolling form by one step. Based on the proposed scheme, using DEFORM-3D software on the rim of the wheel rolling numerical simulation, discuss reasonable rim a roll forming processing parameters. The simulation results show that it is credible the established rim rolling process simulation modeling method and a forming step numerical simulation. Using orthogonal experiment method for optimizing the process parameters, the group of the most reasonable technological parameters is found which provides a theoretical basis for the production of wheel rim.更多还原