机械5

注塑机螺杆机筒的加工工艺及夹具设计 摘要 夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。夹具利用率高，经济性好，对功能组件的使用和数量少。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。 夹具主要依据零件的加工要求来设计的。夹具应满足零件加工工序的精度要求、加工生产率要求，并保证操作方便、安全及使用寿命和较低的夹具制造成本。本课题设计的题目是注塑机螺杆机筒的加工工艺及夹具设计。其零件轴类零件，轴类零件是一种很重要也很典型的零件，主要为塑料成型和注塑机的正常工作提供保证。本文设计的专用夹具为钻Ф12圆柱孔。本夹具是以保证加工精度，生产效率和便于工人操作为宗旨展开的设计。 设计之初我查阅相关数据及国内外关于机床夹具的文献，在看懂零件图的同时对零件的结构和工艺进行分析，明确粗基准和精基准的选择，确定零件的加工余量与毛坯的尺寸、从而确定零件的加工工艺过程、计算各工序的切削用量及工时。最终完成了本次设计所需的夹具。 关键词：注塑机、螺杆机筒、加工工艺、夹具、钻Ф12圆柱孔 ABSTRACT The fixture is a clampi
ng device for part machi
ni
ng a
nd is a
n i
ndispe
nsable device for machi
ni
ng parts. Fixture utilizatio
n is high, the eco
nomy is good, the use of fu
nctio
nal compo
ne
nts a
nd the
number of small. As the size of the parts cha
nges, more a
nd more fixtures are elimi
nated, so it is
necessary to desig
n a set of special fixtures. I
n the desig
n of special fixture to co
nsider theworkpiece positio
ni
ng program, theworkpiece clampi
ng program a
nd desig
n clampi
ng mecha
nism, the other compo
ne
nts of the fixture, fixture structure a
nd so o
n. The fixture is mai
nly desig
ned accordi
ng to the machi
ni
ng requireme
nts of the parts. The fixture should meet the precisio
n requireme
nts of the parts processi
ng process, the processi
ng productivity requireme
nts, a
nd e
nsure the co
nve
nie
nce of operatio
n, safety a
nd service life a
nd lower fixture ma
nufacturi
ng costs. The subject of this desig
n is the i
njectio
n moldi
ng machi
ne screw barrel processi
ng tech
nology a
nd fixture desig
n. Parts of shaft parts, shaft parts is avery importa
nt a
ndvery typical parts, mai
nly for the plastic moldi
ng a
nd i
njectio
n moldi
ng machi
ne to provide a guara
ntee of
normalwork. This paper desig
ned a special fixture for drilli
ngФ12 cyli
ndrical hole. The fixture is desig
ned to e
nsure machi
ni
ng accuracy, productivity a
nd ease of operatio
n. At the begi
n
ni
ng of the desig
n I read the releva
nt data a
nd domestic a
nd foreig
n literature o
n the machi
ne fixture, read the parts at the same time the parts of the structure a
nd process a
nalysis, a clear refere
nce to the rough base a
nd fi
ne selectio
n to determi
ne the parts of the processi
ng margi
n a
nd rough Size, so as to determi
ne the parts of the processi
ng process, calculate the amou
nt of cutti
ng a
ndworki
ng hours of each process. Eve
ntually completed the desig
n of the fixture required. Keywords: I
njectio
n moldi
ng machi
ne, screw barrel, processi
ng tech
nology, fixture, drillФ12 cyli
ndrical hole 目录 摘要I ABSTRACT II 第1章绪论1 1.1机床夹具的概述1 1.2机床夹具的组成及分类1 1.2.1机床夹具的组成1 1.2.2机床夹具的分类2 1.3机床夹具的发展方向2 1.4机床夹具在机械加工中的作用3 1.5夹具设计的特点和基本要求4 1.5.1夹具设计的特点4 1.5.2设计的基本要求4 第2章螺杆机筒零件的工艺分析5 2.1零件的作用5 2.2零件的工艺分析5 2.3零件生产类型的确定6 2.4零件材料及制造方式的确定6 2.5基准的选择7 2.6确定加工方法8 2.7确定加工方案8 2.8机械加工刀具的选择9 2.9机械加工余量，工序尺寸及毛坯尺寸的确定9 2.10确定切削用量及基本工时12 第3章专用夹具的设计22 3.1问题的提出22 3.2夹具设计22 3.2.1确定定位方案，选择定位元件22 3.2.2定位基准选择22 3.2.3切削力及夹紧力计算23 3.2.4确定夹紧方案和夹紧元件23 3.2.5确定夹具体24 3.2.6确定导向装置24 3.2.7误差的分析24 第4章结论25 致谢26 参考文献27