Y轴前轴承座的机械加工工艺规程设计说明书.doc

机械制造技术基础课程设计说明书1机械制造技术基础课程设计说明书题目Y轴前轴承座的机械加工工艺规程设计分院、专业机械设计制造及其自动化班级学生姓名指导教师成绩2010年1月7日沈阳理工大学应用技术学院机械制造技术基础课程设计说明书2目录工艺部分·······················································································31.1有关零件的结构分析和功用·························································31.1.1零件的功用···········································································31.1.2零件的结构分析······································································31.2课题（提供的技术资料）····························································41.2.1生产纲领···············································································41.2.2技术资料···············································································41.3毛坯的种类··············································································41.3.1确定毛坯的种类······································································41.4定位基准的选择原则··································································41.4.1粗基准的选择原则···································································41.4.2精基准的选择原则···································································51.5工艺规程的拟定········································································51.5.1制定工艺规程的原则································································51.5.2拟定工艺路线·········································································51.6机械加工余量工序尺寸及毛坯尺寸的确定······································61.6.1确定加工余量和工序尺寸··························································61.6.2确定毛坯尺寸·········································································71.7确定切削余量···········································································71.7.1确定和计算切削用量································································81.8工时定额的确定········································································81.8.1计算工时定额·········································································9结论······························································································10参考文献························································································11机械制造技术基础课程设计说明书31.Y轴前轴承座的工艺规程设计1.1零件的分析和功用1.1.1零件的功用Y轴前轴承座是防尘与排尘具有保护轴的特效。1.1.2零件的结构分析Y轴前轴承座共有3组加工表面，它们相互间有一定的位置要求。现分述如下：1.工件A、B，C端面为中心的加工表面这一组加工表面为：工件长度237mm、工件高度宽度各180mm，114.3H7内孔长度25mm、50内孔长度10mm、62j6内孔长度75mm，工件中心直径84的圆上均布六个M10-6H深20的螺纹孔和200四个M12-6H深24的螺纹孔。2.62j6内孔为中心加工的表面这一组加工表面包括：长度75mm的62的里壁表面、长度10mm的50内孔、长度25mm的114.3H7的内孔。这组两组加工表面之间有着一定的位置要求，主要是：B端面62j2内孔和工件底面A端面的平行度要求为0.015mm与62j2的里壁圆跳动为0.01，C端面与B端面的垂直度为0.02。由以上分析可知，对于这两组加工表面而言，可以先加工其中一组表面，然后借助于专用夹具加工另一组表面，并且保证它们之间的位置精度要求。机械制造技术基础课程设计说明书41.2课题（提供的技术资料）1.2.1生产纲领零件件数为3000-1000件，为大批大量生产，采用精度高的金属型造型法铸造。1.2.2技术资料Y轴前轴承座零件图1.3毛坯的种类1.3.1确定毛坯的种类零件材料为HT200，采用铸造成型。这对于提高生产率、保证加工质量是有利的。1.4定位基准的选择原则1.4.1粗基准的选择原则1.应选择不加工表面为粗基准2.对于具有较多加工表面的加工余量，粗基准的选择，应合理分配各加工表面的余量，以保证：各加工表面都具有足够的加工余量；对某些重要表面，尽量使其加工余量均匀；使工件上各加工表面总的金属切除量最小。3.作为粗基准的表面，应尽量平整，没有浇口，冒口或飞边等其他表面缺陷，以便定位准确。4.同一尺寸方向上的粗基准表面只能使用一次。