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    5WB右曲轴箱体加工工艺及夹具设计毕业论文.doc

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    5WB右曲轴箱体加工工艺及夹具设计毕业论文.doc

    本科毕业设计说明书(论文)第I页共I页目录1引言·······································································································11.1气动行业的发展现状··············································································11.2气动行业的发展趋势··············································································21.3我国气动行业面临的挑战和机遇······························································325WB右曲轴箱体的零件分析······································································42.15WB右曲轴箱体的特点和和作用·····························································43毛坯的选择······························································································53.1毛坯材料的种类·····················································································53.2确定毛坯时应考虑的因素········································································53.3确定毛坯时的几项工艺措施·····································································63.4确定毛坯的制造形式··············································································645WB右曲轴箱体的工艺规程设计································································74.1工艺规程的作用·····················································································74.2制定工艺规程的原则··············································································74.3零件的工艺性分析··················································································74.4曲轴箱体加工的主要问题和工艺过程设计所应采取的相应措施·····················85基准的选择·····························································································105.1基准的概念··························································································105.2基准的分类··························································································105.3基准问题的分析····················································································105.4定位基准的选择····················································································116拟订工艺路线··························································································136.1工艺路线方案·······················································································136.2机械加工余量、工序尺寸及毛坯尺寸的确定··············································146.3确定切削用量及基本工时(机动时间)····················································167夹具设计································································································237.1机床夹具的作用及其组成·······································································237.2零件工艺性分析····················································································23结束语········································································································31致谢···········································································································32参考文献·····································································································33本科毕业设计说明书(论文)第1页共33页1引言现代科学技术的不断发展,极大地推动了不同学科的交叉与渗透,导致了工程领域的技术革命与改造。气动技术正朝着节能、环保、机电一体化等方向发展。气动技术是以压缩空气为介质来传动和控制机械的一门专业技术,它具有节能、无污染、高效、低成本、安全可靠、结构简单等优点,随着生产自动化程度的不断提高,气动技术应用面迅速扩大,气动产品品种规格持续增多,性能、质量不断提高,气动技术应用面的扩大是气动工业发展的标志。机械加工工艺规程是规定零件机械加工工艺过程和操作方法等的工艺文件。它是机械制造工厂最主要的技术文件。每个产品零部件的加工,在保证技术要求的前提下,可以采用许多工艺方案来完成。不同的工艺方案所选择的设备及加工方法等均有不同,工作量、费用等同样有差别,因而反映出来的经济效益就有差异。为了寻求较高的经济效益,提高生产效率,降低成本,在编制工艺文件时,经常碰到如何选择既能符合技术条件要求又具有较高经济效益的最佳工艺方案的问题。在机加工过程中,为了提高生产效率,人们常常利用气动夹具来夹紧工件。如在镗、铣、刨、平磨加工过程中,可以利用气动夹具把工件快速固定在工作台上,但在车削加工中使用气动夹具较少。利用更好的夹具可以保证加工质量,机床夹具的首要任务是保证加工精度,特别是保证被加工工件的加工面与定位面以及被加工表面相互之间的位置精度;提高生产率、降低成本,使用夹具后可以减少划线、找正等辅助时间,且易于实现多工位加工。扩大机床工艺范围,在机床上使用夹具可使加工变得方便,并可扩大机床工艺范围。减轻工人劳动强度,保证生产安全。本次毕业设计制定5WB右曲轴箱体的加工工艺以及夹具设计,使通过对曲轴的结构分析及其运用所学相关知识对其加工工艺进行分析和夹具的设计。1.1气动行业的发展现状气动技术应用面的扩大是气动工业发展的标志。气动元件的应用主要为两个方面:维修和配套。过去国产气动元件的销售要用于维修,近几年来,直接为主要配套的销售份额逐年增加。国产气动元件的应用,从价值数千万元的冶金设备到只有几百元的椅子。铁道扳岔、列车的煞车、街道清扫、特种车间内的起吊设备、军事指挥车等都用上了专门开发的国产气动元件。这说明气动技术已渗透到各行各业,并且正在日益扩大。本科毕业设计说明书(论文)第2页共33页在汽车制造、电子、工作机械(纺织、印刷、包装、设备、机床)、食品等工业产业的自动化进程中,气动技术发挥着重要的作用。随着新材料、新技术、新工艺的开发和应用,气动技术已经突破传统的设计、制造理念、正在IT、生物制药、医疗机械等高技术领域扮演着重要角色。目前,我国气动行业具有一定规模的生产企业共有1000多家,其中主要企业约300余家。根据中国液压气动密封件工业协会不完全统计,2007年液压工业总产值207.6亿元,同比增长28.95。与此同时,液压气动行业的标准化工作也已形成比较完善的,适合行业发展并逐步与国际标准接轨的液压气动标准体系。本行业现有国家标准96项,行业标准63项,合计159项。这些标准在行业生产中已得到普遍应用,基本满足企业的生产、开发和市场需要。1.2气动行业的发展趋势随着IT工业,通信技术、传感技术的不断发展,以及新技术、新产品、新工艺、新材料等在工业界的应用,气动元件、气动技术作为主机配套的重要基础件也发生了革命性的变化。主要体现在标准化、微型化、模块化、集成化、系统化、智能化、状态监测/可诊断等方面。气动技术具有成本低、无污染、安全、可靠性高和使用寿命长等优点,加上近年在缓冲、伺服和集成化等方面的技术发展,使它的应用与日俱增。气动技术的应用范围大,广泛应用于各个领域,不仅用于生产、工程自动化和机械化中,还渗透到医疗保健和日常生活中。气动系统具有防火、防爆等特点,可应用于矿山、石油、天然气、煤气等设备。还因其耐高温,适用于火力发电设备、焊接夹紧装置等。同时,它容易净化,可用于半导体制造、纯水处理、医药、香烟制造等设备。气动系统的高速工作性能,在冲床、压机、压铸机械、注塑机等设备中得到了广泛的应用。随着生产自动化程度的不断提高,气动技术应用面迅速扩大、气动产品品种规格持续增多,性能、质量不断提高,同时陆续开发出适应市场要求的新产品,使气动元件的品种日益增加,其发展趋势主要有以下几个方面:(1)精确化(2)小型化、集成化(3)高速化(4)复合化(5)安全性本科毕业设计说明书(论文)第3页共33页1.3我国气动行业面临的挑战和机遇在气动技术领域里,传统的调节元件往往基于机械反馈工作原理,如经典的减压阀。目前出现的工业化的气动毕环控制系统,即伺服气动系统是在传感技术、电子技术、现代控制技术和软件技术的最新发展基础上实现的。伺服气动实现了气动系统输出物理量的连续控制,主要用于气动驱动机构的启动(加速)和控制、速度控制(如机械手的抓取力控制)和精确的任意定位方面。面对越来越激烈的国际市场竞争,我国气动业面对着严峻的挑战。我们在技术上已经落后,加上资金不足,资源短缺,以及管理体制和周围环境也存在许多问题,需要改进和完善,这些都给我们迅速赶超世界先进水平带来极大的困难。但另一方面,我国改革的不断深入,对外开放的不断扩大,为我国气动制造业的振兴和发展提供了前所未有的良好条件。当今,气动行业的世界格局已经和在正在发生重大的变化,欧、亚、美三分天下的局面已经形成,世界经济重心开始向亚洲转移已出现征兆,气动行业的产品结构、生产模式也在迅速变革之中。所有这些又给我们带来了难得的机遇。挑战和机遇并存,我们应该在正视现实,面对挑战,抓住机遇,深化改革,以振兴和发展中国的气动行业为已任,励精图治,奋发图强,以使我国的气动行业在不太长的时间内,赶上世界先进水平1。

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