车床变速箱中拔叉及专用夹具设计 毕业设计/毕业论文/课题报告 -

摘要

本次设计是车床变速箱中拔叉零件的加工工艺规程及一些工序的专用夹具设计。此拔叉零件的结构较为复杂，其加工的地方主要是孔和平面。本设计先加工孔后加工面。将孔与平面的加工明确划分成粗加工和精加工阶段以保证它们的加工精度。基准选择以拔叉右面的最大的平面作为粗基准，来加工中间的通孔，然后以此加工过的孔作为精基准。主要加工工序安排是先以中心孔定位加工出顶平面和右侧平面以及下面的大孔的两平面，再以中心孔定位加工出下端的大孔。加工时是用镗床镗孔。最后以这两个孔为基准，分别加工右侧的槽和顶面的螺纹底孔。整个加工过程选用了钻床、铣床和镗床。工件在机床上定位夹紧选用专用夹具，夹紧方式为手动夹紧，夹紧可靠，操作方便。因此生产效率较高，适用于大批量、流水线上加工。能够满足设计要求。
关键词：加工工艺，定位，夹紧，专用夹具 [来源：http://www.think58.com]

ABSTRACT

This design is a lather to become soon an appropriation for inside pulling out fork spare parts processing craft rules distance and some work prefaces tongs design.This pull out the construction of the fork spare parts than for complicacy, its the place that process is a peaceful in bore primarily.This design processes after processing first the bore.Process with flat surface the clear and definite dividing the line the bore the coarseness processes to process with the nicety the stage to guarantee their process the precise degree.The basis choice to pull out rough basis of conduct and actions of the biggest flat surface of the right in fork, process the in the center in general use bore, then be used as the precise basis with the bore that processed.Processing primarily work preface arrangement is first to process a flat surface with the center bore fixed position with the right side flat surface and below big bore of two flat surface, again with center bore the fixed position processes the big bore that carry down.While processing is to use the boring machine boring bore.Regard these two bores as the basis finally, process the right-hand slot respectively with the thread bottom bore of the a.Whole processes the process chose to use to the drill machine, miller with the boring machine .The tongs chooses to use the appropriation tongs, clipping tight way as to move to clip tight, clip tight and dependable, operation convenience.Therefore produce the efficiency higher, be applicable to the large quantity measures, the flowing water is on-line to process.Can satisfy the design request. [来源：http://think58.com]
KeywordsL：Process the craft，Fixed position，Clip tight，Appropriation tongs [版权所有：http://think58.com]

目 录

摘 要 Ⅰ
Abstract Ⅱ

1 绪论 1
1.1课题背景 1
1.2夹具的发展史 1
1.3小结 2
2 拨叉80-08的加工工艺规程设计 3
2.1零件的分析 3
2.1.1零件的作用 3
2.1.2零件的工艺分析 3
2.2确定生产类型 3
2.3确定毛坯 3
2.3.1确定毛坯种类 3
2.3.2确定铸件加工余量及形状 3
2.3.3绘制铸件零件图 4
2.4工艺规程设计 4
2.4.1选择定位基准 4
2.4.2制定工艺路线 4
2.4.3选择加工设备和工艺设备 6
2.4.4机械加工余量、工序尺寸及公差的确定 6
2.5确定切削用量及基本工时 8
2.5.1工序1：粗铣Φ25H7的两侧面 8
2.5.2工序2：粗铣平下端面孔侧面的工艺凸台 9
2.5.3工序3：钻Φ25H7的通孔 9
2.5.4工序4：扩Φ25H7的通孔 11
2.5.5工序5：铰Φ25H7的通孔 12
2.5.6工序6：粗铣a、b面 12
2.5.7工序7：粗铣Φ60H12孔的两面 14
2.5.8工序8：精铣Φ60H12孔的两面 14
2.5.9工序9：粗镗下端Φ60H12的孔 15
2.5.10工序10：半精镗下端孔到Φ60H12 16
2.5.11工序11：粗铣16H11的槽 16
2.5.12工序12：半精铣16H11的槽 17
2.5.13工序13：钻Φ20.50的孔 18
2.5.14工序14：攻M22×1.5的螺纹 19
2.5.15工序15：铣开Φ60H12的孔 20
2.6本章小结 21 [资料来源：http://THINK58.com]
3 专用夹具设计 22
3.1镗孔夹具设计 22
3.1.1问题的提出 22
3.1.2夹具的设计 22
3.2铣槽夹具设计 25
3.2.1问题的提出 25
3.2.2夹具的设计 25
3.3钻孔夹具设计 29
3.3.1问题的提出 29
3.3.2夹具的设计 30
3.4本章小结 35
结论 36
参考文献 37
致 谢 38 [资料来源：http://www.THINK58.com]