工装设计{夹具设计}.doc

工装夹具课程设计说明书

题目：题目：夹具设计

学姓班

号：名：级：

指导老师

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一、设计目的1、通过《工程机械工艺过程计划与实施》大型实训课题----夹具设计培养有关学生运用机械加工的各种方法，结合“教、学、做”过程中学到的基本技能知识，独立分析和解决零件工艺设计问题，初步具备设计中等复杂装备的能力；2、能根据被加工零件的技术要求，运用夹具设计的基本原理和方法，学会拟定夹具设计方案，完成夹具的结构设计，提高结构设计能力；3、培养学生熟练运用有关手册、规范、图表等技术资料的能力；4、培养学生识图、制图、分析问题、解决问题的能力。二、设计任务1、按课题要求设计夹具，并画出装配图；2、设计夹具所有的零件，并画出所有零件图；3、编制夹具设计说明书；4、夹具设计说明书、夹具装配图、零件图按顺序装订归档。三、设计周期设计时间为一周。

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设计题目
批量加工如图5-9所示的零件，加工过程如下：序号12工序同时铣大小端面同时铣大小另一端面钻铰?12H9孔并倒角钻铰?8H9孔并倒角钻?7孔和螺纹M6底孔铣2mm槽攻螺纹M6机床X5025X5025

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Z5125

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Z5125

567

Z5125X6026Z5125

试设计第5道工序钻?7孔和螺纹M6的底孔的夹具。

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图5-9零件图

目

录

设计任务书……………………………………………………………………………………1

1．根据零件图和工艺过程确定工件定位方案················································································52、设计定位元件。····························································································································53、设计夹紧方案································································································································64、布置导引元件················ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ?5．绘制夹具总图（`草图）··············································································································96、课程设计心得体会······················································································································107、参考文献······································································································································11

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1．根据零件图和工艺过程确定工件定位方案

零件的端面与端面上的孔都加工完成，可以选择大端孔?12端面作主要定位基准，限制3个自由度，用于加工夹紧支持，?12与短圆柱销配合，限制2个自由度，孔?8用棱形销限制1个自由度，取“一面两孔”的定位方案，完全定位，如图5-10所示。

图5-10

定位方案

考虑到在Z5125立钻上加工，定位面布置在竖直方向，加工时工件呈“壁挂”式安装。

2、设计定位元件。设计定位元件。

与?12H9的孔配合的短圆柱销，取IT7精度，与工件孔成?12H9/h7配合，两销中心距公差取孔距公差的1/3。棱形销直径计算如下：查表，取宽度b＝3，补偿量a＝（δLD+δLd）/2=(0.4+0.12)/2＝0.26mm,则：棱形销与孔的取小间隙为X2min：

X2min＝2ab/D2=2×0.26×3/8.018=0.195mm；
d2=D2-X2min=8.018-0.195=?7.823mm。IT7，则：d2=?7.823h7=?8?0..177。?0192

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定位元件与工件配合如图5-11所示。

图5-11定位元件