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1零件的分析·······················51.1零件的作用·····················51.2零件的工艺分析···················52零件的生产类型······················52.1生产纲领······················52.2生产类型······················63毛坯的确定························63.1确定毛坯类型及其制造方法··············63.2估算毛坯加工的机械加工余量·············64定位基准选择······················64.1选择精基准·····················64.2选择粗基准·····················65制定机械加工工艺路线···················65.1选择加工方法····················65.2加工工艺路线····················76加工余量及尺寸的确定····················86.1确定粗加工支架上端面的加工余量及工序尺寸······86.2确定支架底面的加工余量及工序尺寸··········96.3确定精加工支架上端面的加工余量及工序尺寸······116.4确定支架右侧面的加工余量及工序尺寸·········126.5确定支架右侧面φ18孔的加工余量及工序尺寸······13
6.6确定支架下端面的加工余量及工序尺寸·········156.7确定支架小侧面的加工余量及工序尺寸·········176.8确定支架2*φ13孔的加工余量及工序尺寸········177切削用量和时间定额的确定················198课程设计总结······················21参考文献·························附1紧轮支架零件图附2毛坯图附3机械加工工艺过程综合卡片附4夹具零件图附5夹具装配图22
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