三爪卡盘增力机构夹具设计毕业.docx
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三爪卡盘增力机构夹具设计毕业.docx
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三爪卡盘增力机构夹具设计毕业
三爪卡盘增力机构夹具设计毕业
重庆三峡学院毕业设计(论文)
题目三爪卡盘增力机构夹具设计
专业机械设计制造及其自动化(数控方向)
年级2009级
学生学号200915144248
学生姓名付辉骥
指导教师葛卫国职称高级讲师
完成毕业设计(论文)时间2012年12月
前言·············································································································1
第一章夹具的简介···························································································2
1.1夹具的特点························································································2
1.2研究夹具的目的和意义··········································································2
1.3夹具的基本结构和原理··········································································3
第二章三爪卡盘螺旋摆动式液压缸增力机构的结构和原理···········································3
第三章主要参数确定与结构计算··········································································4
3.1液压腔的结构设计················································································4
3.2转子叶片数的设计················································································4
3.3摆动角的设计······················································································5
3.4定子圆柱活塞杠面积的设计·····································································5
第四章凹槽轮廓线的设计···················································································6
4.1轮廓面段数的确定················································································6
4.2活塞杠升程的确定················································································6
4.3参数θ1的设计·····················································································8
4.4参数β的设计······················································································9
第五章夹具在安装和操作时应注意的事项································································10
5.1夹具的安装·························································································10
5.2夹具在操作时应注意的事项······································································10
第六章夹具的经济效益分析··················································································11
第七章单工位夹具与成组夹具的分析······································································13
7.1定位基准与定位元件的选择·······································································13
7.2夹紧元件与夹紧力的选择·········································································13
7.3夹具基体的设计夹具基体··········································································13
7.4机壳成组夹具结构··················································································13
第八章误差分析·······························································································14
8.1定位误差分析························································································14
8.2装备误差分析·······················································································14
致谢·············································································································15
结论···············································································································15
参考文献·········································································································16
三爪卡盘增力机构夹具设计
重庆三峡学院应用技术学院机械设计制造及其自动化(数控方向)专业2009级重庆万州404000
[摘要]设计是在三爪卡盘上加装摆动式液压缸和平面螺旋机构的螺旋摆动式液压缸增力机构的结构。
传统的机床如车床、铣床上三爪卡盘的工作一般依靠工人用手工进行夹紧,这不但增加了工人的劳动强度,而且所需夹紧力非常大,还常常有夹不紧的情况,阻碍了生产率的提高。
通过在三爪卡盘加装摆动式液压缸和平面螺旋机构构成螺旋摆动式液压缸增力机构,可实现与原有卡盘体的较好结合,并使外加压力能转换成圆周运动,且其结构简单,工作可靠,能达到较高的增力比,最后能达到较好的效果。
[关键词]三爪卡盘液压缸夹具增力
前言
产品设计无疑作为工业设计的核心,它涉及的面广,从人们的衣食住行,到社会的各行各业,产品设计无时不有,无时不在。
产品设计的对象既包括一般的日用生活制品,也包括工业生产的机床,加工工具;既包括家用小电器产品,也包括专业的仪器,仪表;既包括私有的自行车,摩托车,也包括大型的汽车,飞机等交通工具本论文设计一种在三爪卡盘上加装摆动式液压缸和平面螺旋机构的螺旋摆动式液压缸增力机构的结构。
传统的机床如车床、铣床上三爪卡盘的工作一般依靠工人用手工进行夹紧,这不但增加了工人的劳动强度,而且所需夹紧力非常大,还常常有夹不紧的情况,阻碍了生产率的提高。
通过在三爪卡盘加装摆动式液压缸和平面螺旋机构构成螺旋摆动式液压缸增力机构,可实现与原有卡盘体的较好结合,并使外加压力能转换成圆周运动,且其结构简单,工作可靠,能达到较高的增力比,具有良好的经济性和可行性。
第1章夹具介绍
1.1夹具的特点
机床夹具通常是指装夹工件用的装置:
至于装夹各种刀具用的装置,一般称为“辅助工具”。
辅助工具有时也广义地包括在机床家具的范围内。
按照机床夹具的应用,一般可分为通用夹具,专用夹具和可调整式夹具等。
通用夹具是在普通机床上一般都附有通用夹具,如车床上的卡盘,铣床上的回转工作台,分度头,顶尖座等。
他们都标准化了,具有一定的通用性,可以用来安装一定形状尺寸范围内的各种工件而不需要进行特殊的调整。
但是,在实际生产中,通用家具常常不能够满足各种零件加工的需要;或者因为生产率低而必须把通用夹具进行适当的改进;或者由于工件的形状,加工的需求等的不同须专门设计执照一种专用夹具,以解决生产实际要。
专用夹具是为了适应某一工件的一工序加工的需求而专门设计制造的,其功用主要有下列几个方面:
1.保证工件被加工表面的位置精度,2.缩短了工序的时间。
从而提高了劳动生产率。
进行某一工序所需要的时间,其主要包加工工件所需要的机动时间和装卸工建等所需要的辅助时间两部分。
采用专用夹具后,安装工件和转换工位的工作都可以大为简化,从而提高了生产率3.可以减轻劳动强度,保障安全生产。
根据生产需要,采用一些气动,液压或西塔机械化的专用夹具,对于减轻工人的劳动强度,保障生产安全和产品的稳定高产都有很大作用。
在实际生产应用的夹具很多,分类的方法也有很多种。
通常还可以按实用家居的工序不同分为车床夹具,铣床夹具。
车床夹具:
包括车床,内外圆磨床其特点是夹具与工件一起作旋转运动,铣床类夹具:
包括铣床,刨床等机床用夹具,其特点是家居固定字工作台。
。
只作纵向或横向往复运动或回转运动。
综上所述,机床夹具已成为机械加工中的必不可少的重要装备。
机床夹具的设计和使用是促进生产发展的重要工艺措施这一。
因此对机床夹具的改进和创造已成为广大机械工人和技术人员在技术革新中的一项重要任务。
1.2研究夹具的目的和意义
机床夹具设计是一个重要组成部分相对于机床工装设计而言,是保证产品质量和提高劳动生产率的一项重要技术措施。
在设计过程中应深人实际,进行调查研究,吸取国内外的先进技术,在进行中外结合制定出合理的设计方案,再进行具体的设计。
而深入生产实际调查研究中,应当掌握下面的一些资料:
1.工件图纸;认真看工件的图纸,懂的工件被加工表面是技术要求,该件在机器中的位置和作用,以及装置中的特殊要求。
2.工艺文件:
了解工件的工艺过程,该工序的加工要求,工件被加工表面及待加工面状况,基准面选择的情况,可用机床设备的主要规格,与夹具连接部分的尺寸及
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