翻转式钻模设计与装配工艺规划 摘要 夹具是机械加工不可缺少的部件，在机床技术向高速、高效、精密、复合、智能、环保方向发展的带动下，夹具技术正朝着高精、高效、模块、组合、通用、经济方向发展。 该的设计任务是加工零件杠杆臂，端面一个，侧壁上一个。由于该零件属于大批量生产，钻孔精度要求较高，所以设计一个专用的钻床夹具，保证零件的加工质量。由于夹具的利用率高，经济性好，使用元件的功能强并且数量少，配套费用低，降低了生产成本；采用夹紧装置，缩短停机时间，提高生产效率。 设计钻床夹具，首先要仔细分析加工零件的技术要求，运用夹具设计的基本原理和方法，拟定夹具设计方案；在满足加工精度的条件下，合理的进行安装、定位、夹紧；在完成夹具草图后，进一步考虑零件间的连接关系和螺钉、螺母、定位销等的固定方式，设计合理的结构实现各零部件间的相对运动；根据各零件的使用要求，选择相应的材料。 完成钻床夹具的所有设计后，用AutoCAD进行二维图形的绘制，首先画装配图，然后从装配图上拆画零件图，标注相关尺寸及技术要求，最后进行的撰写、整理、修改完成该设计。 关键词：夹具；钻床夹具；精度；CAD Flip jig desig
n a
nd assembly process pla
n
ni
ng Abstract Fixture is a
n i
ndispe
nsable compo
ne
nt i
n machi
ni
ng, i
n the machi
ne tool tech
nology to high-speed, high efficie
ncy, precisio
n, complex, i
ntellige
nt, e
nviro
nme
ntally frie
ndly directio
n, drive
n by fixture tech
nology is movi
ng i
n high-precisio
n, high efficie
ncy, module, combi
natio
n, ge
neral eco
nomic directio
n. The task of the thesis is processi
ng five holes o
n parts (cabi
net) ,four face, a sidewall.As the parts are high-volume productio
n,hole require high precisio
n, so the desig
n of a special drilli
ng fixture.Assura
nce the quality of machi
ni
ng .Tha
nks to the high utilizatio
n rate of the fixture, the eco
nomy is good, with stro
ng features a
nd a small
number of compo
ne
nts, supporti
ng low-cost, lower productio
n costs,with clampi
ng device, reduce dow
ntime, improve productio
n efficie
ncy. Desig
ned drilli
ng fixture, the first careful a
nalysis is the tech
nical requireme
nts for processi
ng compo
ne
nts, fixture desig
n usi
ng the basic pri
nciples a
nd methods.Prepared the fixture desig
n scheme ;Meet the co
nditio
ns of precisio
n ,the
n reaso
nable i
nstallatio
n, positio
ni
ng, clampi
ng;After the completio
n of draft fixture, a
nd further co
nsider the co
n
nectio
n relatio
n betwee
n parts a
nd screws,
nuts, pi
ns a
nd other fixed mea
ns,desig
ni
ng the reaso
nable structure to achieve relative motio
n betwee
n the various compo
ne
nts;Requireme
nts of the various compo
ne
nts, select the appropriate materials. Completio
n of all drilli
ng fixture desig
n, usi
ng the AutoCAD drawi
ng two-dime
nsio
nal graphics,first draw assembly drawi
ng, a
nd the
n removed from the part drawi
ng o
n the pai
nti
ng Parts,marki
ng the related to size a
nd tech
nical requireme
nts,fi
nally, write a thesis, orga
nize, edit, complete the graduatio
n project. Key words: Fixture; drilli
ng fixture; accuracy; CAD 主要符号表 钻削力 安全系数 钻头直径 σb应力 K安全系数 F摩擦系数 Fx钻削力径向分力 Fy钻削力轴向分力 F
n支持力 a Fx对应的力臂 b Fy对应的力臂 实际所需夹紧力 理论夹紧力 基准不重合误差 基准位移误差 定位误差 对刀误差 安装误差 夹具误差 加工方法误差 总加工误差 B工件厚度 H钻套高度 h排屑空间的高度 最大配合间隙 X孔的偏移量X 加工尺寸 目录 1绪论1 1.1机床夹具的发展概括1 1.2夹具的特点2 1.3夹具的设计要点3 2钻模夹具的总体设计4 2.1设计任务4 2.2夹具的设计步骤5 2.3钻模夹具的设计6 2.4对定位元件的基本要求7 2.5定位方案与定位元件7 2.6夹紧8 2.7夹紧方案的选择9 2.7.1钻削切削力9 2.7.2实际所需夹紧力的计算11 2.7.3夹紧计算与原理14 3钻模夹具体及夹具零件的设计16 3.1夹具体的要求16 3.2夹具体毛坯的类型17 3.3钻模板以及钻套的设计19 3.3.1钻模板19 3.3.2钻套20 3.3.3钻模板和钻套的具体设计20 4夹具误差的计算22 4.1角度尺寸公差22 4.2定位误差22 4.3工件在夹具上加工的精度分析23 4.4夹具误差的计算23 5标准件的选用27 5.1标准件27 5.2定位销、钻模板27 5.3辅助螺旋支撑、可换钻套29 6装配工艺设计31 结论33 致谢34 参考文献35