CA6140机床后托架课程设计说明书

XXXXXX 摘 要

摘 要

在生产过程中，使生产对象（原材料，毛坯，零件或总成等）的质和量的状态发生直接变化的过程叫工艺过程，如毛坯制造，机械加工，热处理，装配等都称之为工艺过程。在制定工艺过程中，要确定各工序的安装工位和该工序需要的工步，加工该工序的机车及机床的进给量，切削深度，主轴转速和切削速度，该工序的夹具，刀具及量具，还有走刀次数和走刀长度，最后计算该工序的基本时间，辅助时间和工作地服务时间。

关键词 工序，工艺，工步，加工余量，定位方案，夹紧力

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xxxxxxxx Abstract

ABSTRACT

Enable producing the target in process of production (raw materials, the blank , state of quality and quantity on part become always ) take place direct course of change ask craft course, if the blank is made, machining, heat treatment , assemble etc. and call it the craft course. In the course of making the craft , is it confirm every erector location and worker step that process need this of process to want, the locomotive of processing , this process , and the entering the giving amount of the lathe, cut depth , the rotational speed of the main shaft and speed of cutting, the jig of this process, the cutter and measuring tool, a one hundred sheets of number of times still leaves and a one hundred sheets of length leaves, calculate basic time of this process , auxiliary time and service time of place of working finally.

Keywords： The process, worker one, worker's step , the surplus of processing,

orient the scheme , clamp strength

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XXXXXXX 目 录

目 录

摘 要 .................................................................................................................................................... I ABSTRACT ........................................................................................................................................... II 目 录 .................................................................................................................................................. 1 1 CA6140机床后托架加工工艺 ........................................................................................................... 3 1.1 CA6140机床后托架的工艺分析 ................................................................................................. 3 1.2 CA6140机床后托架的工艺要求及工艺分析 .............................................................................. 3 1.2.1 CA6140机床后托架的技术要求 ........................................................................................... 4 1.3 加工工艺过程 ............................................................................................................................... 4 1.4 确定各表面加工方案 ................................................................................................................... 4 1.4.1 在选择各表面及孔的加工方法时，要综合考虑以下因素 ................................................ 4 1.4.2 平面的加工 ............................................................................................................................ 4 1.4.3孔的加工方案 ......................................................................................................................... 4 1.5 确定定位基准 ............................................................................................................................... 5 1.5.1 粗基准的选择 ........................................................................................................................ 5 1.5.2 精基准选择的原则 ................................................................................................................ 6 1.6 工艺路线的拟订 ........................................................................................................................... 6 1.6.1工序的合理组合 ..................................................................................................................... 7 1.6.2 工序的集中与分散 ................................................................................................................ 7 1.6.3 加工阶段的划分 .................................................................................................................... 8 1.6.4 加工工艺路线方案的比较 .................................................................................................... 9 1.7 CA6140机床后托架的偏差，加工余量，工序尺寸及毛坯尺寸的确定 ................................ 12 1.7.1 毛坯的结构工艺要求 .......................................................................................................... 12 1.7.2 CA6140机床后托架的偏差计算 ......................................................................................... 13 1.8 确定切削用量及基本工时（机动时间） .................................................................................. 16 1.8.1 工序1：粗、精铣底面 ....................................................................................................... 16 1.8.2 工序2 粗、半精、精镗CA6140侧面三杠孔 ................................................................ 18 1.8.3 工序3：钻顶面四孔 ........................................................................................................... 24 1.8.4 工序4：钻侧面两孔 ........................................................................................................... 28 1.9 时间定额计算及生产安排 ......................................................................................................... 30 1.9.1 粗、精铣底面 ...................................................................................................................... 31 1.9.2 镗侧面三杠孔 ...................................................................................................................... 31 1.9.3 钻顶面四孔 .......................................................................................................................... 32 2

专用夹具设计 ................................................................................................................................ 34 2.1 镗孔夹具设计 ............................................................................................................................. 34 2.1.1 研究原始质料 ...................................................................................................................... 34 2.1.2 定位基准的选择 .................................................................................................................. 34 2.1.3 切削力及夹紧力的计算 ...................................................................................................... 34 2.1.4 误差分析与计算 .................................................................................................................. 36

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XXXXXXX 目 录

结 论 .................................................................................................................................................... 38 参考文献 ................................................................................................................................................ 39 致 谢 .................................................................................................................................................... 40

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XXXXXXXXXX CA6140机床后托架加工工艺

1 CA6140机床后托架加工工艺

1.1 CA6140机床后托架的工艺分析

CA6140机床后托架的是CA6140机床的一个重要零件，因为其零件尺寸较小，结构形状也不是很复杂，但侧面三杠孔和底面的精度要求较高，此外还有顶面的四孔要求加工，但是对精度要求不是很高。后托架上的底面和侧面三杠孔的粗糙度要求都是Ra1.6，所以都要求精加工。其三杠孔的中心线和底平面有平面度的公差要求等。因为其尺寸精度、几何形状精度和相互位置精度，以及各表面的表面质量均影响机器或部件的装配质量，进而影响其性能与工作寿命，因此它的加工是非常关键和重要的。

1.2 CA6140机床后托架的工艺要求及工艺分析

锪平图1.1 CA6140机床后托架零件图

一个好的结构不但要应该达到设计要求，而且要有好的机械加工工艺性，也就是要有加工的可能性，要便于加工，要能够保证加工质量，同时使加工的劳动量最小。而设计和工艺是密切相关的，又是相辅相成的。设计者要考虑加工工艺

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