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盐城电大毕业设计说明书 2006双筋蹄组合机床的夹具设计摘 要：夹具主要依据零件的加工要求来设计的。夹具应满足零件加工工序的精度要求、加工生产率要求，并保证操作方便、安全及使用寿命和较低的夹具制造成本。本课题加工的零件是焊接件，总体呈拱形，两端分别有直径为20mm和30mm的孔，拱形的外缘有一高为100mm的肋板。零件的加工精度要求较低。 根据六点定位原理和定位基准的选择原则，采用长V型块，支承块和定位挡铁定位。长V型块置于拱形肋板后限制x轴的两自由度和z轴的两自由度，挡铁置于孔端限制绕y轴旋转的自由度，支承块置于肋板下方限制沿y轴移动的自由度。依据相关原理计算定位误差。根据夹紧方式的选择原则选择夹紧元件为压板压头和V型块，然后通过切削力进行夹紧力的计算。夹紧的动力装置选用液压装置。按照定位元件和夹紧元件设计连接件。因为刀杆较短，所以在本课题中导向元件设计就不作要求。然后进行其它元件和装置的设计。根据以上元件和装置确定夹具总体布局和夹具体的结构形式，并处理好定位元件在夹具体上的位置。绘制夹具方案设计，进行工序精度分析。对以上设计进行审核。最后设计夹具总装配图。 关键词：夹具; 定位; 夹紧; 组合机床。The design of the jig of double rebars and feet of modular machineAbstract: The jig design is based on the request of parts working . the jig should satisfy the request of mading procedure precision , the processing productivity, and guarantee ease of operation, security ,service life and low production cost. This parts are the weldment in this task, the whole parts with two holes lying in head and foot whose the diameter respectively are 20mm and the 30mm assume the arch, the arch outflow boundary has a ribbed plate whose height is the 100mm. The parts processing precision is low. According to six localizations principles and selection principle of the localization datum, using the long V block, the supporting block and the localization comes true the hard localization. The long V block putted in the arch ribbed plate to limit two degrees of freedom in x axis and the z axes two degrees of freedom, the iron putted in the hole end limit to the degree of freedom which circle the y rotation of axis, the supporting block putted under the ribbed plate to limit degree of freedom along the y axis migration. position error is reckoned by the correlation principle . According to the way of the selection principle , discharge head and V block is selected to clamp the part .Then Computation of the strength is achieved by carrying on through the cutting force clamps . The power of clamps is from the hydraulic unit. Design of bridge piece is according to the location part and the clamp part. The guide part designing in this topic is not requested because the cutter bar is short. Other parts and equipment is designed following last process. The jig overall arrargement and concrete structure of the body clamp is determined with the above part and the equipment. The position of the components in the kits specific location must be guaranteed ,and then design the jig , carry on the working procedure precision analysis. The d