机械5

方刀架的工艺规程及夹具设计 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。 方刀架的加工工艺规程及钻4-φ15孔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：方刀架、加工工艺、夹具设计、工艺、工序、切削用量。 ABSTRCT This desig
n i
nvolves ma
ny aspects of k
nowledge, such as mecha
nical ma
nufacturi
ng process, machi
ne tool fixture desig
n, metal cutti
ng machi
ne tool, tolera
nce coordi
natio
n a
nd measureme
nt. Machi
ni
ng process specificatio
n of square tool rest a
nd drill 4- φ The desig
n of 15 hole fixture i
ncludes three parts: process desig
n, process desig
n a
nd special fixture desig
n. 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, select the machi
ni
ng be
nchmark of the parts, a
nd desig
n the process route of the parts; The
n calculate the size of each process step of the part. The key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each process. The
n the special fixture is desig
ned, a
nd each compo
ne
nt of the fixture is selected a
nd desig
ned, such as positio
ni
ng eleme
nt, clampi
ng eleme
nt, guidi
ng eleme
nt, co
n
necti
ng part betwee
n the fixture a
nd the machi
ne tool, a
nd other compo
ne
nts; Calculate the positio
ni
ng error caused by fixture positio
ni
ng, a
nalyze the ratio
nality a
nd shortcomi
ngs of fixture structure, a
nd pay atte
ntio
n to improveme
nt i
n the future desig
n. Key words: square tool holder, machi
ni
ng process, fixture desig
n, process, process, cutti
ng parameters. 目录 摘要I ABSTRCT II 序言1 一零件的分析2 1.1零件的作用2 1.2零件的工艺分析2 二毛坯的确定3 2.1确定毛坯的制造形式3 2.2毛坯形状及尺寸3 三拟定加工工艺路线4 3.1基准的选择4 3.1.1粗基准选择4 3.1.2精基准的选择4 3.2制定工艺路线5 3.3机械加工余量、工序尺寸及毛坯尺寸的确定7 3.4确定切削用量及基本工时7 四夹具设计13 4.1工序分析13 4.2定位元件设计13 4.3定位误差的计算13 4.4钻模版的设计13 4.5切削力及夹紧力计算14 4.6夹具体的设计14 4.7定向键设计15 4.8夹具草图15 设计小结17 总结18 致谢19 参考文献20