机械5

摘要 本次课程设计的目的是对拨叉零件进行机械加工工艺规程设计和孔加工工序的专用夹具设计，使我们提高制定工艺规程、查阅资料并计算工艺要素的能力。首先我们应当根据零件图对零件进行工艺分析，计算确定其生产纲领及生产类型，其次确定毛坯的种类、制造方法、尺寸和公差，拟定工艺路线，确定各工序加工余量、尺寸公差、机床、刀具、量具、切削用量和时间定额，最后确定夹具方案并进行总体设计计算与绘图。最终成果是完成课程设计说明书及相关图纸呈现。结论是因拨叉是变速箱中的重要零件，拨叉零件的形位尺寸、公差精度以及各表面的粗糙度均影响机器整体质量及寿命，因此零件加工必须保证精度要求。 关键词：拨叉；工艺加工；专用夹具 Abstract The purpose of this course desig
n is to desig
n the machi
ni
ng process rules for the fork parts a
nd the special fixture desig
n for the hole machi
ni
ng process, so thatwe ca
n improve the ability to formulate the process rules, co
nsult data a
nd calculate the process eleme
nts. First of all,we shall, accordi
ng to part drawi
ng parts for process a
nalysis, calculate a
nd determi
ne the productio
n program a
nd the productio
n type, seco
ndly determi
ne the ki
nds of bla
nk, ma
nufacturi
ng method, the dime
nsio
n a
nd tolera
nce, drafti
ng process route, determi
ne the machi
ni
ng allowa
nce, dime
nsio
nal tolera
nce i
n each process, machi
ne tools, cutti
ng tools, measuri
ng tool, cutti
ng dosage a
nd time quota, fi
nalized jig scheme a
nd overall desig
n calculatio
n a
nd drawi
ng. The fi
nal result is to complete the course desig
n specificatio
n a
nd releva
nt drawi
ngs. The co
nclusio
n is that because shifti
ng fork is a
n importa
nt part i
n gearbox, the shape a
nd positio
n size, tolera
nce accuracy a
nd rough
ness of each surface of shifti
ng fork all affect the overall quality a
nd life of the machi
ne, so the machi
ni
ng of the parts must e
nsure the precisio
n requireme
nts. Keywords: shifti
ng fork; Process processi
ng; Special fixture 目录 1.零件的工艺分析及生产类型的确定 1.1零件的用途 1.2零件的工艺分析 1.2.1拨叉零件需要加工部位的技术要求 1.2.2审核拨叉的工艺性 1.2.3确定拨叉的生产类型 2.毛坯的选择 3.工艺规程设计 3.1定位基准选择 3.2零件表面加工方法的选择 3.3制定工艺路线 3.4确定毛坯尺寸、设计毛坯图 3.5工序设计 3.5.1选择加工设备与工艺装备 3.5.2确定工序尺寸 3.6切削用量、时间定额的计算 3.6.1切削用量时间定额的计算 4.夹具设计 4.1问题的提出 4.2确定夹具结构方案 4.3夹紧力的计算 4.4绘制夹具总图 4.5绘制夹具体零件图 5.设计总结 6.参考文献