摘  要
本次设计的主要内容包括空压机曲轴的工艺规程设计和系列夹具设计的两大方面。
制定工艺规程设计的原始资料包括：零件的图样，产品验收质量标准，产品的年生产纲领和生产类型、毛坯图样、生产条件、零件材料等。制定工艺规程设计步骤如下：审查零件的图样，工艺方案的确定，对样品进行工艺分析，零件的毛坯选择以及毛坯图说明; 工艺设计过程（包括加工段的分析，工序的集中和分散，工序顺序的安排，定位基准的选择，零件表面加工方法的选择); 制定工艺路线（工艺方案，工艺方案的比较与分析），工序间尺、公差、表面粗糙度及毛坯尺寸的确定，加工余量、切削用量、工时定额的确定，填写工艺文件。夹具设计必须满足的要求有：保证加工精度，夹具的总体方案应与年生产纲领相适应，安全、方便、减轻劳动强度，排屑顺畅，具有良好的强度、刚度和结构工艺性。夹具设计包括工件的定位，定位误差的分析与计算，夹紧机构的确定，夹具力的确定（包括方向，作用点和大小）。
    当工艺规程及夹具设计确定后，再绘制夹具总装配图、主要零件图和说明书的编写。
 
关键词：工艺规程设计；夹具设计；加工余量；定位误差
 Abstract
    The design of the main contents include two aspects of the M3400 thermostat process planning and fixture series.
    The original development of process planning include: part drawings and assembly drawings must be quality standards for product acceptance, the agenda for the annual production and production type, rough drawings, production conditions. Development of process planning, follow these steps: review of part design, process analysis part, select the part of the rough, draw a rough diagram, process design (including positioning reference choice, the choice of the parts of the surface processing methods, processing the order of arrangement process combinations), process design (including choice of machine tool equipment and tooling, the determination of allowance in the process, the process of determination of dimensions and tolerances, the choice of cutting the amount of time quota determined), the technical and economic analysis, the complete process documents. The fixture design requirements that must be met: ensure accuracy the fixture overall program should be adapted to the agenda for the annual production, safe, convenient, reduce labor intensity and smooth chip, has good strength, stiffness and structure of the process. Fixture design including jigs and fixtures design overview, the choice of positioning with locating datum clamp mechanism design, positioning error analysis and calculation, the clamping mechanism to determine the clamping force OK.
    When the process planning and fixture design is determined, and then draw a the fixture assembly drawings, preparation of the main parts diagram and instructions.
 
Keywords: process planning; fixture design; allowance; positioning error
  目  录