【毕业设计论文】3L-108空气压缩机曲轴零件的机械加工工艺及夹具设计毕业设计

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毕业设计论文3L-108空气压缩机曲轴零件的机械加工工艺及夹具设计毕业设计

摘 要

此次毕业设计任务是对3L-10/8空气压缩机曲轴零件的机械加工工艺、夹具的设计，在曲轴零件的加工工艺过程中轴与轴中心线之间要有位置要求， 以毛坯轴两端定位先加工两中心孔，以两端中心孔定位再粗、精加工各轴的表面，然后以粗、精后的两轴径定位钻螺纹、铣键槽和铣曲拐端面，采用专用夹具加工两斜油孔，最后粗、精磨各轴。
在夹具的设计过程中，主要以V形块和支承板来定位，靠直压板和弹簧来夹
紧，钻拐径两孔应采用长型快换钻套，在钻拐径倾斜30o的孔时采用平面倾斜的夹具体，在钻拐径倾斜040的孔时使用的是卧式钻床，铣面时2个V形块与铣刀不能干涉，因此V形块高度要降低，夹具设计要方便、简单。


关键词 曲轴，加工工艺，夹具设计。


目 录

摘 要································ ································ ································ ·····························I
ABSTRACT································ ································ ································ ·····················I
1 绪 论································ ································ ································ ························· 1
2 零件分析································ ································ ································ ····················· 2
2.1零件的作用································ ································ ································ ············ 2
2.2零件的工艺分析································ ································ ································ ····· 2
2.3零件加工的主要问题和工艺过程设计分析································ ······························· 2
3 工艺规程设计································ ································ ································ ············· 5
3.1确定毛坯的制造形式································ ································ ······························ 5
3.2基面的选择································ ································ ································ ············ 5
3.2.1 粗基准选择································ ································ ································ ·5
3.2.2 精基准的选择································ ································ ······························ 5
3.3制定工艺路线································ ································ ································ ········· 5
3.4机械加工余量、工序尺寸及毛坯尺寸的确定································ ··························· 7
3.5 确定切削用量及基本工时································ ································ ····················11
3.6 时间定额计算及生产安排································ ································ ···················· 31
4 专用夹具设计································ ································ ································ ··········· 40
4.1加工曲拐上端面油孔夹具设计································ ································ ·············· 40
4.1.1定位基准的选择································ ································ ························· 40
4.1.2切削力的计算与夹紧力分析································ ································ ······· 40
4.1.3夹紧元件及动力装置确定································ ································ ··········· 41
4.1.4钻套、衬套及夹具体设计································ ································ ··········· 42
4.1.5夹具精度分析································ ································ ···························· 44
4.2加工曲拐上侧面油孔夹具设计································ ································ ·············· 45
4.2.1定位基准的选择································ ································ ························· 45
4.2.2切削力的计算与夹紧力分析································ ································ ······· 45
4.2.3夹紧元件及动力装置确定································ ································ ··········· 46
4.2.4钻套、衬套及夹具体设计································ ································ ··········· 47
4.2.5夹具精度分析································ ································ ···························· 48
4.3铣曲拐端面夹具设计································ ································ ···························· 49
4.3.1定位基准的选择································ ································ ························· 49
4.3.2定位元件的设计································ ································ ························· 49
4.3.3铣削力与夹紧力计算································ ································ ·················· 50
4.3.4对刀块和塞尺设计································ ································ ····················· 51
4 结 论································ ································ ································ ······················· 53
参考文献································ ································ ································ ························· 54
致 谢································ ································ ································ ····························· 55