机械5

1105柴油机中摇臂结合部的气门摇臂轴支座的机械加工工艺及夹具设计 摘要：气门摇臂轴支座是柴油机气门系统上一个重要部件，用来装配摇臂轴和减压轴，调节柴油机轴端气压，并设计有排油孔，用于润滑轴的润滑油排出。而目前课题要求是设计出气门摇臂轴支座的加工工艺以及夹具设计。因此，毛坯设计和工艺分析是亟待解决的问题。 根据以上问题，本文设计出相应的办法予以解决。对零件进行分析，设计加工工艺，使用砂型铸造对零件进行毛坯铸造，通过铣削和钻削处理毛坯达到零件需要，并设计φ16和φ18孔加工的相应夹具。 该工艺以制造出需要零件为目的，具有方法简单、成本低、易于制造等特点，同时对零件加工时候的专用夹具进行完善，最后解决气门摇臂轴支座的加工问题。 关键词：砂型铸造；铣削；钻削；夹具 Machi
ni
ng process a
nd fixture desig
n ofvalve rocker shaft support for rocker arm joi
nt part of diesel e
ngi
ne 1105 Absrtact: thevalve rocker arm shaft support is a
n importa
nt part i
n thevalve system of diesel e
ngi
ne. It is used to assemble the rocker shaft a
nd the decompressio
n shaft, to regulate the air pressure at the shaft e
nd of the diesel e
ngi
ne, a
nd to desig
n a oil hole for the lubricati
ng oil discharge of the lubricati
ng shaft. At prese
nt, it is
necessary to desig
n the machi
ni
ng tech
nology a
nd fixture desig
n of thevalve rocker shaft support. Therefore, bla
nk desig
n a
nd process a
nalysis are urge
nt problems to be solved. Accordi
ng to the above problem, this article desig
ns the correspo
ndi
ng method to solve. Desig
n the processi
ng tech
nology, use sa
nd mold casti
ng to cast the bla
nk of the part, a
nd through milli
ng a
nd drilli
ng, the bla
nk ca
n meet the requireme
nts of the part, a
nd desig
n correspo
ndi
ng fixtures forΦ 16 a
ndΦ 18 hole processi
ng. The process aims at ma
nufacturi
ng the required parts, a
nd has the characteristics of simple method, low cost, easy ma
nufacture a
nd the like. at the same time, the special fixture for processi
ng parts is improved, a
nd fi
nally, the processi
ng problem ofvalve rocker shaft supports is solved. Keywords: Sa
nd casti
ng; Milli
ng; Drilli
ng; Fixture目录 摘要I Absrtact II 第一章绪论1 1.1课题研究的目的与意义1 1.1.1课题研究目的1 1.1.2研究意义1 1.2课题主要研究现状与内容1 1.2.1发展现状1 1.2.2夹具的发展现状2 1.2.3课题主要研究内容3 第二章气门摇臂轴支座的工艺分析5 2.1零件的分析5 2.1.1零件的结构分析5 2.2.2零件的精度分析6 2.2.3零件的粗糙度分析6 2.2零件毛坯的设计7 2.2.1选择毛坯种类7 2.2.2确定毛坯尺寸及加工总余量8 2.2.3设计毛坯图9 第三章工艺路线设计11 3.1定位基准的选择11 3.2零件的表面加工11 3.3工序顺序安排12 3.3.1机械加工遵循原则12 3.3.2热处理工序12 3.3.3辅助工序13 3.3.4确定工艺路线13 第四章加工设备的选择及切削用量的确定15 4.1加工设备及测量量具应用15 4.2机械加工工艺的加工余量16 4.3切削用量和基本加工时间的确定17 第五章气门摇臂轴支座专用夹具设计31 5.1确定夹具的结构方案31 5.1.1确定定位方案，选择定位原件31 5.1.2孔加工导向装置的确定32 5.1.3选择夹紧原件33 5.1.4选择辅助定位原件33 5.2设计夹具体34 总结35 参考文献37 致谢39