机械5

摘要 本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。 此次设计任务是对拨叉831003零件的加工工艺、夹具设计，在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；该工件由于上端面和底槽均与花键孔中心有位置关系，因此在工序安排上，先加工花键孔，再通过花键孔定位加工底槽和上端面，最后攻螺纹孔，其中各种夹具均采用专用夹具，由于该零件的尺寸小，所需的夹紧力不大，因此都采用手动夹紧，它的机构设计简单、方便，且满足夹紧要求。 关键词拨叉831003，加工工艺，定位，加工基准；工艺路线 Abstract This desig
n co
nte
nt i
nvolves the mecha
nical ma
nufacturi
ng process a
nd fixture desig
n, metal cutti
ng machi
ne, tolera
nce a
nd measureme
nt a
nd other aspects of k
nowledge. This desig
n task is to desig
n the processi
ng tech
nology a
nd fixture of the fork 831003. I
n the process desig
n,we should first a
nalyze the part, u
ndersta
nd the process of the part, the
n desig
n the structure of the bla
nk, select the processi
ng be
nchmark of the part, a
nd desig
n the process route of the part; the
n calculate the size of each step of the part, the key is to determi
ne the process equipme
nt of each process Because the upper e
nd face a
nd bottom groove of theworkpiece have positio
n relatio
nshipwith the ce
nter of spli
ne hole, i
n the process arra
ngeme
nt, firstly process the spli
ne hole, the
n locate the bottom groove a
nd upper e
nd face through the spli
ne hole, a
nd fi
nally tap the threaded hole. All ki
nds of fixtures are special fixtures. Due to the small size of the part a
nd the small clampi
ng force required, ma
nual clampi
ng is adopted The structure desig
n is simple a
nd co
nve
nie
nt, a
nd meets the clampi
ng requireme
nts. Keywords: shifti
ng fork 831003, processi
ng tech
nology, positio
ni
ng, processi
ng be
nchmark; process route 目录 摘要I Abstract II 绪论1 一、零件的分析2 1.1拨叉831003的作用2 1.2拨叉831003的工艺分析2 1.3拨叉831003的工艺要求2 二、工艺规程设计3 2.1确定毛坯的制造形式3 2.2.1选择毛坯3 2.2.2确定毛坯尺寸公差和机械加工余量3 2.2基准面的选择4 2.3制定工艺路线4 2.3.1工艺路线方案一4 2.3.2工艺路线方案二5 2.3.3两套工艺方案的比较与分析5 2.4机械加工余量、工序尺寸及毛坯尺寸的确定5 2.5确定切削用量及基本工时6 三铣左端面的夹具设计20 3.1提出问题20 3.2夹具设计20 3.2.1定位基准的选择20 3.2.2定位误差的分析20 3.2.3铣削力及夹紧力计算21 3.2.4夹具设计说明21 结论22 参考文献23 致谢24