机械5

KST1015叉杆的加工工艺及铣60后下端面夹具设计 摘要 伴随国内经济快速发展的今天，零件的外形和种类也越来越多。随着零件的尺寸变化，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。 本课题的主要研究内容是KST1015叉杆的加工工艺及铣削60后端面夹具设计。叉杆的典型的叉类零件，它位于车床变速机构中，主要起换档，使主轴回转运动按照工作者的要求工作，获得所需的速度和扭矩的作用。在设计初，首先要看懂零件图，并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，从而明确零件的加工工艺过程，最后再计算各工序的切削用量及工时。 通过本次对专用夹具的设计，其加工成本低，加工时间短，加工方案合理，为现实的生产中提供一定的理论依据。 关键词：KST1015、叉杆、工艺、铣削、60后端面 Abstract With the rapid developme
nt of domestic eco
nomy, the shape a
nd types of parts are i
ncreasi
ng. With the cha
nge of the size of the parts, it is
necessary to desig
n a special fixture. Whe
n desig
ni
ng the special fixture,we should co
nsider the positio
ni
ng scheme of theworkpiece, the clampi
ng scheme of theworkpiece a
nd the desig
n of the clampi
ng mecha
nism, other parts of the fixture, the structure of the fixture a
nd so o
n. The mai
n research co
nte
nt of this topic is the processi
ng tech
nology of KST1015 fork rod a
nd the desig
n of 60 e
nd face milli
ng fixture. The typical fork part of the fork bar,which is located i
n the lathe tra
nsmissio
n mecha
nism, mai
nly shifts gears, so that the spi
ndle rotary motio
nworks accordi
ng to the requireme
nts ofworkers, a
nd obtai
ns the required speed a
nd torque. At the begi
n
ni
ng of desig
n, it is
necessary to u
ndersta
nd the part drawi
ng, a
nalyze the structure a
nd process of the part, determi
ne the selectio
n of rough a
nd precisio
n datum, determi
ne the machi
ni
ng allowa
nce a
nd the size of the bla
nk, so as to defi
ne the processi
ng process of the part, a
nd fi
nally calculate the cutti
ng parameters a
nd time of each process. Through the desig
n of this special fixture, its processi
ng cost is low, processi
ng time is short, processi
ng scheme is reaso
nable, a
nd provides a certai
n theoretical basis for practical productio
n. Keywords: KST1015, fork bar, process, milli
ng, 60 e
nd face 目录 摘要I Abstract II 引言1 1零件的工艺性分析2 1.1零件的组成表面、技术要求及形位公差分析2 1.1.1零件的组成表面分析2 1.1.2零件的技术要求分析2 1.1.3零件的形位公差分析2 1.2零件的作用2 1.3零件的工艺性审查3 1.4确定零件的生产类型4 2拟定零件工艺路线及确定毛坯6 2.1选择定位基准6 2.1.1粗基准的选择6 2.1.2精基准的选择6 2.2工序顺序的安排原则6 2.3制定工艺路线7 2.3.1工艺路线方案1 7 2.3.2工艺路线方案2 7 2.3.3工艺路线的分析、确定8 2.4零件毛坯的确定8 2.5机床、夹具、刀具及量具的确定9 2.6零件加工余量的确定10 2.7切削用量及时间定额的计算11 3铣削60后端面专用夹具设计26 3.1选择定位方案和定位元件26 3.1.1选择定位方案26 3.1.2选择定位元件26 3.2选择夹紧方案和夹紧元件28 3.2.1选择夹紧方案28 3.2.2选择夹紧元件28 3.3确定夹具体28 3.4确定对刀块29 3.5计算切削力和夹紧力29 3.5.1计算切削力29 3.5.2计算夹紧力30 3.6分析定位误差30 结论32 致谢33 参考文献34