机械5

摘要 现代机械加工行业发生着深刻的结构性变化，工艺工装的设计与改良已成为相关企业生存和发展的必要条件。夹具行业作为一个传统而富有活力的行业，近十几年取得了突飞猛进的发展。在新经济时代，这一行业呈现了新的发展趋势。 本次设计对扇形曲柄零件的加工工艺分析及钻Ф5孔进行夹具设计研究。首先对零件进行分析，然后选择毛坯制造形式，制订工艺路线，确定机械加工余量、切削用量等。对于专用夹具的设计，首要的任务是想好设计方案，根据所设计的方案确定定位面，限制每个定位元件的自由度，使其达到设计要求。为保证工件在本工序中所有需要完成的待加工面充分暴露在外，夹具要做的尽可能敞开，因为夹紧机构元件和加工面之间应保持一定的安全距离，以防止夹具与钻套、刃具在加工过程中发生干涉。 通过本次设计提升了我独立分析与解决机械制造的实际课题的能力，并且在计算机CAD、资料检索等方面也得到了锻炼与提高。 关键词：扇形曲柄、加工工艺、夹具设计、切削用量、定位 Abstract The moder
n mecha
nical processi
ng i
ndustry has u
ndergo
ne profou
nd structural cha
nges. The desig
n a
nd improveme
nt of tech
nological tooli
ng has become a
necessary co
nditio
n for the survival a
nd developme
nt of related e
nterprises. Fixture i
ndustry, as a traditio
nal a
nd dy
namic i
ndustry, has made rapid progress i
n rece
nt decades. I
n the
new eco
nomic era, this i
ndustry prese
nts a
new tre
nd of developme
nt. I
n this desig
n, the processi
ng tech
nology a
nalysis of fa
n cra
nk parts a
nd the clamp desig
n of drilli
ng hole 5 are studied. Firstly, the parts are a
nalyzed, the
n the bla
nk ma
nufacturi
ng form is selected, the process route isworked out, a
nd the machi
ni
ng allowa
nce a
nd cutti
ng parameters are determi
ned. For the desig
n of special fixture, the most importa
nt task is to thi
nk about the desig
n pla
n, determi
ne the positio
ni
ng surface accordi
ng to the desig
n pla
n, limit the freedom of each positio
ni
ng eleme
nt, a
nd make it meet the desig
n requireme
nts. I
n order to e
nsure that all the surface to be machi
ned i
n this process is fully exposed, the fixture should be as ope
n as possible, because there should be a certai
n safety dista
nce betwee
n the clampi
ng mecha
nism compo
ne
nts a
nd the processi
ng surface to preve
nt i
nterfere
nce betwee
n the fixture a
nd the drill sleeve a
nd the cutti
ng tool i
n the process of processi
ng. Through this desig
n, I have improved my ability to i
ndepe
nde
ntly a
nalyze a
nd solve the actual problems of mecha
nical ma
nufacturi
ng, a
nd have also bee
n trai
ned a
nd improved i
n computer CAD, data retrieval a
nd other aspects. Keywords: sector cra
nk, processi
ng tech
nology, fixture desig
n, cutti
ng parameters, positio
ni
ng 目录 摘要I Abstract II 第1章绪论1 1.1课题背景1 1.2目的1 1.3夹具设计中的特点1 1.4夹具设计需保证的条件1 1.5夹具的发展趋势2 第2章零件的分析3 2.1零件的作用3 2.2零件的工艺分析3 第3章工艺规程设计5 3.1确定毛坯的制造形式5 3.2基面的选择5 3.2.1粗基准的选择5 3.2.2精基准的选择6 3.3制订工艺路线6 3.4机械加工余量的确定7 3.5确定切削用量及基本工时9 第四章专用夹具设计22 4.1专用夹具的提出22 4.2定位机构22 4.3夹紧机构23 4.4定位误差设计25 4.4.1定位误差25 4.4.2产生定位误差的原因25 4.4.3定位误差计算26 4.5机床夹具的总体形式27 4.8夹具设计及操作简要说明28 结论29 参考文献30 致谢32