机械5

摘要 拨叉的加工质量将直接影响机器的性能和使用寿命。本次设计旨在提高CA6140车床拨叉的加工效率，由此我们首先对拨叉的结构特征和工艺进行了仔细的分析，然后确定了一套合理的加工方案，加工方案要求简单，操作方便，并能保证零件的加工质量。在制定加工工艺规程的顺序如下： 1分析零件； 2选择毛坯； 3设计工艺规程：包括制定工艺路线，选择基准面等； 4工序设计：包括选择机床，确定加工余量，工序尺寸及毛坯尺寸，确定切削用量及计算基本工时等； 5编制工艺文件。 此外，为了提高劳动生产率，降低劳动强度，保证加工质量，需设计专用夹具，本次设计选择了第5道工序车Ф50孔圆弧面的专用夹具设计，以满足加工过程的需要。 关键词：拨叉;工艺规程;夹具设计 Abstract The processi
ng quality of fork will directly affect the performa
nce a
nd service life of the machi
ne. The purpose of this desig
n is to improve the processi
ng efficie
ncy of the fork of CA6140 lathe. First, we have carefully a
nalyzed the structural characteristics a
nd tech
nology of the fork, a
nd the
n determi
ned a reaso
nable processi
ng scheme. The processi
ng scheme is simple, easy to operate, a
nd ca
n e
nsure the processi
ng quality of the parts. The order of formulati
ng the processi
ng procedure is as follows: 1. A
nalyzi
ng parts; 2. Choose bla
nk; 3. Desig
n process regulatio
ns: i
ncludi
ng formulati
ng process route a
nd selecti
ng datum level, etc. 4 process desig
n: i
ncludi
ng selecti
ng machi
ne tools, determi
ni
ng processi
ng allowa
nce, process size a
nd bla
nk size, determi
ni
ng cutti
ng parameters a
nd calculati
ng basic ma
n-hour, etc. 5. Prepari
ng process docume
nts. I
n additio
n, i
n order to improve labor productivity, reduce labor i
nte
nsity a
nd e
nsure processi
ng quality, special fixture is
needed. I
n this desig
n, the special fixture desig
n of 50 hole arc surface i
n the fifth worki
ng procedure is selected to meet the
needs of processi
ng. Key words: diali
ng fork; process specificatio
n; fixture desig
n 目录 摘要1 Abstract 2 前言5 1.零件分析5 1.1零件的作用5 1.2零件的工艺分析5 2.工艺规程设计6 2.1毛坯的制造形式6 2.2基准面的选择6 2.3制定工艺路线6 2.4机械加工余量、工序尺寸及毛坯尺寸的确定7 2.5确定切削用量及基本工时8 2.5.1工序二：粗、精铣孔Ф20mm、Ф50mm的下表面8 2.5.2工序三：粗、精铣孔Ф20mm、Ф50mm的上表面10 2.5.3工序四：钻、扩、铰、精铰Ф20mm的孔11 2.5.4工序五：粗、精车Ф50 mm的孔16 2.5.5工序六：铣断18 2.5.6工序七：钻锥孔Ф8mm的一半Ф4mm 19 2.5.7工序八：钻Ф5mm的孔，攻螺纹M6 21 2.5.8工序九：铣缺口22 3.绘制零件图和编制工艺文件24 3.1绘制零件图24 3.2编制工艺文件24 4.车Ф50孔圆弧面夹具设计26 4.1问题的提出26 4.2定位基准的选择26 4.3切削力和夹紧力计算26 4.4定位误差分析28 4.5夹具设计及操作的简要说明29 结论30 致谢31 参考文献32