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9道工序铣47°斜面宽10mm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, a special fixture with a width of 10mm for milli
ng 47 degree i
ncli
ned pla
ne i
n the 9th process 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4 1.零件分析4 1.1零件的作用4 1.2零件的工艺分析4 2.工艺规程设计5 2.1毛坯的制造形式5 2.2基准面的选择5 2.3制定工艺路线5 2.4机械加工余量、工序尺寸及毛坯尺寸的确定6 2.5确定切削用量及基本工时7 2.5.1工序二：粗、精铣孔Ф20mm、Ф50mm的下表面7 2.5.2工序三：粗、精铣孔Ф20mm、Ф50mm的上表面9 2.5.3工序四：钻、扩、铰、精铰Ф20mm的孔10 2.5.4工序五：粗、精镗Ф50 mm的孔15 2.5.5工序六：铣断17 2.5.6工序七：钻锥孔Ф8mm的一半Ф4mm 18 2.5.7工序八：钻Ф5mm的孔，攻螺纹M6 20 2.5.8工序九：铣缺口22 3.绘制零件图和编制工艺文件23 3.1绘制零件图23 3.2编制工艺文件24 4、夹具设计25 4.1定位基准的选择25 4.2铣削力与夹紧力计算25 结论27 致谢28 参考文献29