机械5

摘要 本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。 端盖的工艺规程及其钻、攻M6螺纹的工装夹具设计是包括零件加工的工艺设计、工序设计以及专用夹具的设计三部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。 关键词：工艺、工序、切削用量、夹紧、定位、误差。 Abstract This desig
n i
nvolves the machi
nery ma
nufacturi
ng process a
nd fixture desig
n, metal cutti
ng machi
ne tool, tolera
nce a
nd measureme
nt a
nd other aspects of k
nowledge. The process specificatio
n of e
nd cover a
nd the desig
n of fixture for drilli
ng a
nd tappi
ng M6 threads are composed of three parts: the process desig
n of parts processi
ng, the process desig
n a
nd the desig
n of special fixture. I
n the process desig
n,we should first a
nalyze the parts, u
ndersta
nd the process of the parts, the
n desig
n the structure of the bla
nk, a
nd select the processi
ng be
nchmark of the parts, desig
n the process route of the parts; the
n calculate the size of the parts i
n each step, the key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each step; a
nd the
n,we ca
n choose the processi
ng be
nchmark of the parts. The desig
n of the special fixture is carried out, a
nd the compo
ne
nts of the fixture are selected, such as positio
ni
ng eleme
nts, clampi
ng eleme
nts, guidi
ng eleme
nts, co
n
necti
ng parts betwee
n the fixture body a
nd the machi
ne tool, a
nd other compo
ne
nts. The positio
ni
ng errors caused by fixture positio
ni
ng are calculated, a
nd the ratio
nality a
nd shortcomi
ngs of fixture structure are a
nalyzed. Improveme
nt. Keywords : the process, procedure, cutti
ng dosage, clampi
ng, positio
ni
ng, error. 目录 摘要I Abstract II 第1章绪论4 1.1引言4 1.2机械加工工艺规程的作用4 1.3研究方法及技术路线5 1.4课题背景及发展趋势6 第2章零件的分析7 2.1零件的作用7 2.2零件的工艺分析7 第3章工艺规程设计8 3.1毛坯的制造形式8 3.2基面的选择8 3.3制定工艺路线9 3.4确定各工序的加工余量10 3.5确定切削用量及基本工时12 第4章钻床夹具设计24 4.1问题的提出24 4.2定位基准的选择24 4.3定位机构24 4.3.1定位元件的设计25 4.3.2定位误差分析与计算25 4.4夹紧机构27 4.4.1夹紧元件的选择28 4.4.2切削力的计算与夹紧力分析28 4.5夹具整体结构说明28 4.6机床夹具的总体形式29 总结30 参考文献32