毕业设计（论文）-半轴齿轮的热精锻成形工艺设计.doc

摘要
近年来,随着计算机技术的飞速发展,闭塞式精锻技术也取得了巨大的进步。本课题以半轴齿轮为例,先利用模具CAD技术对半轴齿轮进行三维实体建模,然后应用FEM模拟技术等对半轴齿轮的成形过程进行数值模拟仿真。再根据模拟研究出的结果确定出实际生产加工中的重要工艺参数,并优化模具结构。
闭塞式精锻工艺属于金属塑性加工的先进工艺,齿轮精锻就是通过精密锻造直接获得完整齿形,且齿面不需或仅需少许精加工即可使用的齿轮制造技术。它有效地改善了齿轮的组织和性能。精锻齿轮的齿形精度能达到精密级公差、余量标准,工件只需少量精加工就可进行热处理,提高了生产效率及材料利用率,降低了生产成本,大大提高了齿轮制造的市场竞争能力。
在这个研究中我们能够分析金属在成形过程中各种场变量的变化,预测金属流动趋势,并就不同的凸、凹模结构及形状尺寸、连皮厚度、连皮相对于齿轮端面距离等对半轴齿轮的成形载荷、金属流动情况(或充填性)以及模具寿命等的影响规律进行研究,确定了最优的凸、凹模结构、连皮厚度以及连皮相对于齿轮端面的距离等工艺参数。进而根据优化出来的结果设计出了一套合理的热精锻工艺和基于800吨双动液压机的模具。更多详细内容可以查看报告。
通过本课题的研究,将精密锻造理论,数值模拟仿真技术以及模具CAD/CAM技术结合起来,达到了提高生产效率、缩短产品开发周期、提高模具寿命、降低能耗和生产成本等目的。本课题的研究成果可以为其他锥齿轮的生产以及相关的模具设计提供理论和实践依据。
关键词: 半轴齿轮闭塞式精锻 FEM模拟热精锻成形
Abstract
During recent years,with the rapid development puter technology,the technology of enclosed—die forging has achieved great progresses,In this research a kind of half axle gear was model was made by the CAD forming process of the half axle gear was simulated by FEM according to the result simulated from the software to work out the important industrial parameters which is used in real forging progress,and to optimize the structure of molds.
Enclosed—die forging process is one of the advanced processes in the field of metal tooth of gear can be obtained through precision forging process,and the tooth need no or little precision machining structure and performance of gear can be improved effectively through this process. The precision of gear shape e to a very high workpiece needs only a little of machining before heat process increases productivity rate and use ratio of materials,decreases the cost of peting ability of gears is improved greatly.
In this study we can get the transformations of the fields during the process of metal forming were investigated,the tendency of metallic flow was forecasted,and the rules how various items affect the forming load,metallic flow,the life of dies were discove