机械5

阀盖的机械加工工艺规程及4-Ф14孔专用夹具设计 摘要 本文选择了阀盖作为研究对象，阀盖的种类很多，用途也很广。阀盖的一端可以是封闭的，用于变速箱用于变速箱主轴侧面，阻止外界灰尘进入箱体内，也可用于固定轴承，起到轴向定位的作用。 本文主要研究内容是阀盖的机械加工工艺规程及专用夹具设计。制定了加工阀盖的机械加工工艺路线，详细计算了加工余量、切削用量、尺寸公差，确定各工序尺寸、工序加工余量、加工工时、机械加工三要素等，选择其加工设备。通过本设计掌握零件的加工过程分析、工艺卡片的编制和步骤。学会应用手册、标准、规范等资料。认识到工艺在机械制造中的重要性。了解刀具的选用规则，产品质量、精度、寿命等属性和节约材料，降低成本，最重要的是提高生产效率。 设计加工钻削4-Ф14通孔钻床专用夹具，设计内容有：定位方案和夹紧方案的确定，定位元件和夹紧元件的选择，夹具体的设计，钻削力的计算等等。 关键词：阀盖、工艺规程、专用夹具、4-Ф14通孔、钻床 Abstract I
n this paper, thevalve cover has bee
n chose
n as the research object. Thevalve cover has ma
ny ki
nds a
nd useswidely. O
ne e
nd of thevalve cover may be e
nclosed for use i
n the tra
nsmissio
n o
n the side of the mai
n shaft, preve
nti
ng dust from e
nteri
ng the box body, or for fixi
ng the beari
ng to play a
n axial positio
ni
ng role. The mai
n co
nte
nt of this paper is the machi
ni
ng process a
nd special fixture desig
n of the bo
n
net. The machi
ni
ng process route ofvalve cover isworked out. The machi
ni
ng allowa
nce, cutti
ng parameters a
nd dime
nsio
nal tolera
nce are calculated i
n detail. Theworki
ng procedure dime
nsio
ns,worki
ng procedure machi
ni
ng allowa
nce,worki
ng hours a
nd machi
ni
ng eleme
nts are determi
ned, a
nd the machi
ni
ng equipme
nt is selected. Through this desig
n,we ca
n grasp the process a
nalysis of parts, the compilatio
n a
nd steps of process cards. Lear
n applicatio
n ma
nuals, sta
ndards, specificatio
ns a
nd other i
nformatio
n. Recog
nize the importa
nce of tech
nology i
n machi
ne ma
nufacturi
ng. K
nowi
ng the rules of tool selectio
n, product quality, precisio
n, life a
nd other attributes a
nd savi
ng materials, reduci
ng costs, the most importa
nt thi
ng is to improve productio
n efficie
ncy. The special fixture for drilli
ng 4-14 through hole drilli
ng machi
ne is desig
ned a
nd ma
nufactured. The desig
n co
nte
nts i
nclude the determi
natio
n of positio
ni
ng scheme a
nd clampi
ng scheme, the selectio
n of positio
ni
ng eleme
nts a
nd clampi
ng eleme
nts, the desig
n of fixture body, the calculatio
n of drilli
ng force a
nd so o
n. Keywordsvalve cover, process specificatio
n, special fixture, 4- 14 hole a
nd drilli
ng machi
ne 目录 摘要I Abstract II 第1章绪论1 1.1机加工工艺规程及机床夹具的概述1 1.2机床夹具的研究现状2 1.3机床夹具的发展方向2 第2章阀盖机械加工工艺规程设计4 2.1零件的作用、设计基准及技术要求4 2.1.1零件的作用4 2.1.2零件的设计基准4 2.1.3零件的表面构成4 2.2零件加工表面的分析5 2.3零件的机械加工工艺性、材质及热处理要求5 2.3.1零件的机械加工工艺性5 2.3.2零件的材质5 2.4基准的选择及加工方案的选择与确定6 2.4.1基准的选择6 2.4.2加工方案的选择比较与确定7 2.5毛坯尺寸及加工余量的确定8 2.5.1毛坯尺寸的确定8 2.5.2加工余量的确定9 2.6机械加工机床、刀具及量具的选择11 2.7确定切削用量及基本工时11 第3章钻4-Ф14通孔专用夹具设计21 3.1定位方案及定位元件的确定与选择21 3.1.1设计定位方案应满足的要求21 3.1.2定位方案的确定21 3.1.3定位元件的选择21 3.2夹紧方案及装置的确定与选择22 3.2.1设计夹紧装置应遵循的原则22 3.2.2夹紧装置满足的基本要求23 3.2.3夹紧方案的确定23 3.2.4夹紧元件的选择23 3.3夹具体的确定24 3.3.1夹具体的设计要求24 3.3.2夹具体制造形式的确定24 3.4导向装置的确定25 3.5钻削力的计算28 3.6夹紧力的计算28 3.7定位误差的计算29 结论30 致谢31 参考文献32