毕业设计(论文)-U形弯曲件的冲压模具设计(全套图纸) .doc
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毕业设计(论文)-U形弯曲件的冲压模具设计(全套图纸) .doc
U形弯曲件冲压模设计-1-20江苏信息职业技术学院毕业设计设计课题:U形弯曲件的冲压模设计系别:机电工程系专业:模具设计与制造/理化测试与质量检测班级:模具/质检061姓名:学号:指导老师:完成时间:2009-12-01江苏信息职业技术学院毕业设计说明书-2-20毕业设计任务书姓名:学号:0602224113班级:模具/质检061一、设计课题U形弯曲件的冲压模具设计二、零件图及技术要求日期编号文件及其绘图审核校对描图标记更改设计数量签字图产品名称:件数材料零件名称:净重号毛重比例刘鹏09.10.1行弯曲件20t=1mm:11-批量生产注:未注公差按IT12级处理三、任务要求1.完成制件工艺性分析,确定制件成形工艺方案。2.完成模具装配图设计,绘制模具总装图。3.完成模具零件图设计,绘制模具零件图。4.撰写毕业设计说明书。指导教师:江苏信息职业技术学院机电工程系模具教研室2009年12月01号U形弯曲件冲压模设计-3-20目录前言一、冲压件的工艺性分析······························································11.U形弯曲件工作图······································································12.零件原材料及工艺性分析····························································23冲压件的尺寸精度分析································································2二、确定工艺方案及模具结构形式··············································2三、模具设计计算···········································································21.计算条料宽度及确定步距·····························································22.排样····························································································33.U形弯曲件回弹量的确定······························································44.减小和控制回弹的措施······························································45.计算总压力·················································································41)弯曲力····················································································52)冲压总压力·············································································5冲压力····················································································5卸料力·····················································································5推料力····················································································5总压力····················································································66.确定压力中心················································································67.冲模刃口尺寸及公差的计算···························································61)查表确定初始间隙···································································6江苏信息职业技术学院毕业设计说明书-4-202)计算凸,凹模制造公差·····························································63)代入公式计算各尺寸·································································6四、确定主要零件结构尺寸·······························································81.由排样图确定凹模型孔位置·····························································82.确定凹模外形尺寸··········································································83.选则典型组合·················································································9五、冲裁弯曲模主要工作零件的加工·················································9六、模具装配工艺··············································································101.模柄的装配····················································································102.导柱和导套的装配··········································································111)导柱的装配·················································································112)导套的装配·················································································113.凸(凹)模的装配··········································································11七、冲压机的选择···············································································12设计总结·····························································································13答谢辞·································································································14参考文献·····························································································15U形弯曲件冲压模设计-5-20前言冷冲压工艺是一种生产效率很高的、少切削或无切削的先进加工方法,在经济和技术方面都具有很多的优点。它操作简便,便于实现机械化和自动化,适合于较大批量零件的生产,其制品一般都不需作进一步的机械加工,尺寸精度和互换性也都比较好。所以,它在航空、汽车、拖拉机、电机电器、精密仪器仪表等工业中占有十分重要的地位。据相关统计资料介绍,仅汽车制造业就约有60%75%的零件是采用冷冲压加工工艺制成的。若按劳动量估算,冷冲压生产所占的劳动量为整个汽车工业总劳动量的25%30%。在电机及仪器仪表生产中,也有60%70%的零件是采用冷冲压工艺来完成的。此外,随着加强国防建设的需要和人们物质生活水平的提高,在诸如家电。电子元器件和兵器领域内,冷冲压加工量也占有相当大的比例。可见,支持和促进冷冲压加工技术,对发展国民经济和加速工业化建设,具有十分重要的意义。国内的模具工业虽起步较晚,但在过去的十多年中也取得了一些进步。例如冲压模具方面,国内设计制造的部分轿车覆盖件模、空调器散热片级进模、电机定转子双回转叠片高精度硬质合金级进模、集成电路引线框架多工位级进模,以及带自动冲切、叠压、铆合、计数、分组、扭斜和安全保护的功能的精密多功能模,都已达到较高的水平。但从总体上看,我国与工业发达国家相比仍有较大差距。例如,精密加工设备在模具加工设备中的比重还比较低,CAD/CAE/CAM技术的普及率尚待提高,许多先进的模具技术应用还不够广泛等等。特别是在大型、精密、复杂和长寿命模具上,一方面技术差距明显;另一方面产能也不能满足国内的需要,因而仍需大量从国外进口。所以,为变这种被动状态,尽快适应社会主义工业化建设对冷冲压工艺生产水平提高的需要,全方位大力做好模具基础、研发和推广工作,是至关重要的。我国的工业经济,已进入大批量规模经济和小批量多品种经济并行的时期,两者对模具存在趋同的依赖性。产品销售不畅时期,企业必然会想法设法开发新产品,也同样会对模具带来强劲的需求。这说明,模具市场的总体趋势将是一直平稳向上的。有人说,模具工业是永不衰退的工业,也正是基于这样的分析。另外,从另一角度看,两者对模具结构的要求是各不相同的,大批量生产用的模具应着眼于高效率和长寿命,而小批量生产用的模具则应着眼于结构简单、制模快速和成本低廉。江苏信息职业技术学院毕业设计说明书-6-20一、冲压件的工艺性分析1.U形弯曲件工作图图1:U形弯曲件零件图2零件原材料及工艺性分析20钢结构特点正火规范淬火规范工件结构形状弯曲特点20钢的20是指含碳量,含碳量为0.2%,属于低碳钢。该钢属于优质低碳碳素钢,冷挤压、深淡淬硬钢。该钢强度低,韧性、塑性和焊接性均好。抗拉强度为253-500MPa,伸长率24%。温度920950,出炉空冷。硬度131156HBS温度910±10,10%NaCl盐水冷却。冲压件内、外形应尽量避免有尖锐清角,为提高模具寿命,建议将所有90°清角改为R0.5的圆角。1.如图1示例的最小相对弯曲半径为r/t=0.6/1=0.6,查教材P13表3-1得rmin=0.5t0.6t,rmin=tr=0.6t。工件中R0.6处的弯曲线只要与材料纹向平行,则该件最小圆角半径可以不采取任何措施即可弯曲。2.弯曲件的直边高度为4mm2t=2mm满足高度要求3.工件上的孔远离弯曲变性区结论:1.具有良好的可冲压性能。2.具有足够的塑性,较低的屈服极限和较高的弹性模量。U形弯曲件冲压模设计-7-203冲压件的尺寸精度分析零件图上所有尺寸均未标注公差,但零件图上要求未注公差按IT12级处理。经查公差表(公差尺寸等级的选用见手册P965)。其主要尺寸公差标注如下(单位均为mm):,各尺寸公差为:32025.0,30.5025.0,20021.0,4012.0,1218.00,R301.0,1.81.00,4.63.00,7015.0。结论:综上所述,该零件可采用冲压机加工。二、确定工艺方案及模具结构形式经分析,工件尺寸精度要求不高,形状不大,虽图纸上没要求大量生产,但工件可以大量生产,根据材料不厚(1mm)的特点,为保证孔位精度,冲模有较高的生产率,通过比较,决定实行工序集中的工艺方案,采取利用侧刃与导正钉进行定位、弹性卸料装置、自然漏料方式的级进冲压模结构形式。三、模具设计计算1.计算条料宽度及确定步距弯曲件毛坯宽度计算t=1mmr=0.6r0.5tL=L1+L2+L3+0180)(ktrtr=16.0=0.6k=0.38=23+3+3+00180)138.06.0(9014.330.5mm式中:L-弯曲件毛坯长度,mmL1、L2、L3-弯曲件直边长度,mm-弯曲中心角,mmr弯曲件内圆角半径,mmk中性层偏移量系数,mmt弯曲件材料厚度,mm查有关表确定搭边值。根据零件自身形状特点,两工件间按矩形取搭边值b=4,侧边按矩形取搭边值a=2。级进模进料步距为36mm。条料宽度按相应的公式计算:B=(L+2a)0查表=0.4