机械5

摘要 本次设计的内容是制定后壳体零件的加工工艺及铣后端面夹具设计。设计中包含了工艺设计、工序设计以及专用夹具的设计三部分。具体如下： 1、通过对零件工艺进行分析，可以知道零件的加工表面和加工要求。根据零件图提出的加工要求，确定毛坯的制造形式和尺寸的确定。 2、选择基面，确定加工过程中的粗基准和精基准。根据选好的基准，制订工艺路线，通常制订两种的工艺路线，通过工艺方案的比较与分析，再选择可以使零件的几何形状、尺寸精度等技术要求得到合理的保证的一种工序。根据已经选定的工序路线，确定每一步的切削用量及基本工时，并选择合适的机床和刀具。 3、设计铣后端面夹具。对定位方案及元件，夹紧方案及元件进行确定，然后计算切削力、夹紧力和定位误差的分析等。完成夹具装配图及夹具体的绘制等，依设计手册与国家标准来进行详细说明。 关键词：后壳体、加工工艺、夹具设计、工艺路线、切削用量 Abstract The co
nte
nt of this desig
n is to formulate the processi
ng tech
nology of the rear shell parts a
nd the desig
n of the e
nd fixture after milli
ng. The desig
n i
ncludes three parts: process desig
n, process desig
n a
nd special fixture desig
n. The details are as follows: 1. By a
nalyzi
ng the process of parts,we ca
n k
now the processi
ng surface a
nd requireme
nts of parts. Accordi
ng to the processi
ng requireme
nts of the part drawi
ng, the ma
nufacturi
ng form a
nd size of the bla
nk are determi
ned. 2. Choose the base pla
ne to determi
ne the rough a
nd precise datum i
n the process of processi
ng. Accordi
ng to the selected be
nchmark, the tech
nological route isworked out. Usually, two ki
nds of tech
nological route areworked out. Through the compariso
n a
nd a
nalysis of tech
nological schemes, a processwhich ca
n reaso
nably guara
ntee the geometric shape a
nd dime
nsio
nal accuracy of parts is selected. Accordi
ng to the selected process route, the cutti
ng parameters a
nd basicworki
ng hours of each step are determi
ned, a
nd the appropriate machi
ne tools a
nd tools are selected. 3. Desig
ni
ng e
nd fixture after milli
ng. The positio
ni
ng scheme a
nd compo
ne
nts, clampi
ng scheme a
nd compo
ne
nts are determi
ned, a
nd the
n the cutti
ng force, clampi
ng force a
nd positio
ni
ng error are calculated. Complete fixture assembly drawi
ng a
nd fixture body drawi
ng, accordi
ng to the desig
n ma
nual a
nd
natio
nal sta
ndards for detailed descriptio
n. Keywords: rear housi
ng, processi
ng tech
nology, fixture desig
n, process route, cutti
ng parameters 目录 摘要I Abstract II 第1章序言1 1.1课题背景1 1.2夹具的发展史1 1.3小结2 第2章后壳体的分析3 2.1零件的作用3 2.2后壳体的各个形状表面4 2.3后壳体零件图分析5 2.3.1加工表面的粗糙度5 2.3.2设计基准的分析6 第3章毛坯的制造方法7 3.1选择毛坯应考虑的因素7 3.2确定毛坯的制造形式7 3.3绘制毛坯图7 第4章制订工艺路线9 4.1各表面加工方法选择9 4.2定位基准选择9 4.2.1粗基准的选择原则9 4.2.2精基准选择的原则10 4.3制定工艺路线10 4.4机械切削用量及基本工时的确立11 第5章钻床夹具设计28 5.1专用夹具的提出28 5.2定位元件及夹紧元件的选择28 5.3切削力和夹紧力的计算28 5.4定位误差分析29 5.5夹具设计及操作简要说明29 总结30 参考文献31