目录
一、冷挤压零件分析                                                  3
　　1、材料选择                                                      3
　　2、形状设计                                                      3
　　3、尺寸分析                                                      4
二、冷挤压工艺分析                                                  4
　　1、坯料尺寸确定                                                  4
　　2、毛坯软化处理                                                  4
　　3、冷挤压毛坯表面处理与润滑                                      5
　　4、变形程度计算                                                  6
　　5、确定挤压次数                                                  6
　　6、工序设计                                                      8
三、冷挤压设备选择                                                 12
　　1、挤压力的确定                                                 12
　　2、压力机吨位计算                                               12
　　3、挤压设备类型选择                                             13
　　4、液压式压力机型号选择                                         13
四、冷挤压模具结构设计                                             13
五、凸模设计                                                       14
　　1、凸模的长度尺寸计算                                           15
　　2、凸模加工工艺路线                                             15
六、凹模设计                                                       16
　　1、组合凹模结构设计                                              17
　　2、棘轮套挤压齿形模芯的设计                                     17
　　3、齿形模芯加工                                                 20
七、冷挤压件质量分析                                                      20
八、凸模机加工工艺                                                 23
九、非标准件三维结构图                                             24
致谢                                                               30
参考文献                                                           31

棘轮套冷挤压成形工艺及模具设计
　　重庆工商大学机械设计制造及其自动化专业2006级模具班

中文摘要：冷挤压是精密塑性体积成形技术中的一个重要组成部分。冷挤压是指在冷态下将金属毛坯放入模具模腔内，在强大的压力和一定的速度作用下，迫使金属从模腔中挤出，从而获得所需形状、尺寸以及具有一定力学性能的挤压件。显然，冷挤压加工是靠模具来控制金属流动，靠金属体积的大量转移来成形零件的。本设计介绍了棘轮套零件结构分析、挤压工艺过程、挤压设备选择、模具结构的设计、凸凹模设计、挤压件质量分析、棘轮套齿形模芯的结构、凸模加工工艺及模具各部件三维造型进行了叙述，并计算了毛坯体积、毛坯尺寸、变形程度、挤压比和挤压力。与常规的棘轮套加工工艺相比，冷挤压成形的棘轮套具有齿形强度高、齿形尺寸精度较高、表面粗糙度值低、材料利用率高、生产效率高、设备投资少等优势。
关键词：冷挤压   棘轮套   正挤压   凸缘  
Gear Cold Extrusion of the process and die design
(Chongqing Technology and Business University ,mechanical design automation and manufacturing professionals ,06 mold Guo JianJun)
Abstract: Volume precision plastic cold extrusion forming technology is an important component. Cold extrusion is the next in the cold metal blank into the mold cavity, the strong pressure and under a certain speed, forced metal extrusion from the mold cavity to obtain the required shape, size, and has some mechanical performance of extrusion Obviously, the cold extrusion process is to control the metal flow by mold, by transfer to a large number of metal forming volume parts. Ratchet sets introduced structure of parts, extrusion process, extrusion equipment selection, die structure design, punch and die design, extrusion quality analysis, ratchet sets of the structure of tooth punch, punch and die processing of parts, Three-dimensional modeling of the narrative, and calculate the rough size, blank size, deformation, extrusion ratio and extrusion pressure. And conventional processing technology compared to ratchet set, ratchet set of cold extrusion with gear, high strength, high precision gear size, low surface roughness, high utilization ratio, high efficiency, less investment in equipment and other advantages.
key words:   Cold extrusion   Ratchet sets   Extrusion   Flange