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道工序镗Ф50的孔的专用夹具设计，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 the quality of processi
ng, special fixture should be desig
ned. This desig
n chooses the special fixture desig
n of bori
ng hole 50 i
n the fifth process to meet the
needs of processi
ng. Key words: diali
ng fork; process specificatio
n; fixture desig
n 目录 摘要I Abstract II 前言1 1.零件分析1 1.1零件的作用1 1.2零件的工艺分析1 2.工艺规程设计2 2.1毛坯的制造形式2 2.2基准面的选择2 2.3制定工艺路线2 2.4机械加工余量、工序尺寸及毛坯尺寸的确定3 2.5确定切削用量及基本工时4 2.5.1工序二：粗、精铣孔Ф20mm、Ф50mm的下表面4 2.5.2工序三：粗、精铣孔Ф20mm、Ф50mm的上表面6 2.5.3工序四：钻、扩、铰、精铰Ф20mm的孔7 2.5.4工序五：粗、精镗Ф50 mm的孔12 2.5.5工序六：铣断14 2.5.6工序七：钻锥孔Ф8mm的一半Ф4mm 15 2.5.7工序八：钻Ф5mm的孔，攻螺纹M6 17 2.5.8工序九：铣缺口19 3.绘制零件图和编制工艺文件20 3.1绘制零件图20 3.2编制工艺文件21 4.夹具设计22 4.1确定定位方案，选择定位元件22 4.2确定导向装置22 4.3确定夹紧机构22 4.4确定其他装置22 4.5设计夹具体22 结论23 致谢24 参考文献25