机械5

小头孔Φ70的连杆加工工艺规程及钻孔夹具设计 摘要 夹具是现在生产制造业加工非标零件的重要工具，也是机床上不可或缺的一部分。制造业涉及的行业比较的多，零件的外形和构造也是千变万化，很多通用夹具逐步的退出了历史的舞台。所以，针对不同的零件设计配套的夹具是非常有价值的。 本次设计的题目是小头孔Φ70的连杆加工工艺规程及夹具设计，根据图纸要求进行机械工艺规程设计和专用夹具设计，在掌握零件作用基础上，对零件的工艺进行分析。 针对设计给定的题目，设计出小头孔Φ70的专用夹具。里面的知识点主要有对机床夹具进行设计、公差等。先对需要加工的零部件进行了解，分析，以便更加精确的对其进行加工，确定加工零件的标准；然后对每一个步进行计算，要算出每一道工序的切削用量；夹具设计包括：设计出对零件进行定位，夹紧，还有引导的各个元件。在这里我们尤其要注意的是，夹具在定位零部件的时候，会产生误差，这个误差要在我们的合理控制范围以内，我们要充分了解夹具的优缺点，以便改进。 通过上面的设计、分析和计算，圆满的完成了本次设计的所有任务，在巩固大学所学知识的同时，还为自己步入社会夯实基矗 关键词：连杆；小头孔；加工工艺，夹具设计 Abstract Jig is
now a
n importa
nt tool for ma
nufacturi
ng productio
n a
nd processi
ng
no
n-sta
ndard parts, but also a
n i
ntegral part of the machi
ne. Compariso
n of multi-i
ndustry ma
nufacturi
ng i
nvolved parts of the shape a
nd structure is cha
ngi
ng, ma
ny commo
n fixtures graduallywithdrew from the stage of history. So, for differe
nt parts of the desig
n supporti
ng jig it isveryvaluable. The topic of this graduatio
n desig
n is the small holeΦ 70 co
n
necti
ng rod machi
ni
ng process pla
n
ni
ng a
nd fixture desig
n, mecha
nical a
nd process pla
n
ni
ng accordi
ng to special fixture desig
n drawi
ngs, mastered the role of part based o
n the part of the processes a
nalysis. Desig
ned for a give
n problem, desig
n a small head holeΦ70 special fixture. Paper i
nside k
nowledge of the mai
n poi
nts of the machi
ne tool fixture desig
n tolera
nces. First
need to u
ndersta
nd parts processi
ng, a
nalysis, i
n order to be more accurate processi
ng, to determi
ne the sta
ndard machi
ni
ng parts; the
n calculated for each step, the amou
nt to be calculated every step of cutti
ng; fixture desig
n i
nclude: desig
n the parts for positio
ni
ng a
nd clampi
ng, aswell as thevarious eleme
nts of the guide. I
n particular,wewa
nt to
note here is that the jig positio
ni
ng of parts,will produce a
n error, the error should bewithi
n our reaso
nable co
ntrol,we
need to fully u
ndersta
nd the adva
ntages a
nd disadva
ntages of the fixture i
n order to improve. Through the above desig
n, a
nalysis a
nd calculatio
n, the successful completio
n of all the tasks of the graduatio
n project, i
n the co
nsolidatio
n of the u
niversity is k
nowledge, but also lay a solid fou
ndatio
n for themselves i
nto the commu
nity. Keywords: co
n
necti
ng rod; Small hole; machi
ni
ng process；fixture desig
n 目录 摘要I Abstract II 绪论1 第一章连杆体的加工工艺2 1.1连杆体的结构特点2 1.2连杆体的主要技术要求3 1.2.1大、小头孔的尺寸精度、形状精度4 1.2.2大、小头孔轴心线在两个互相垂直方向的平行度4 1.2.3大、小头孔中心距4 1.2.4连杆大头孔两端面对大头孔中心线的垂直度4 1.2.5大、小头孔两端面的技术要求4 1.2.6螺栓孔的技术要求5 1.2.7有关结合面的技术要求5 1.3连杆的材料和毛坯5 1.4连杆的机械加工工艺过程7 1.5连杆的机械加工工艺过程分析9 1.5.1工艺过程的安排9 1.5.2定位基准的选择10 1.5.3确定合理的夹紧方法11 1.5.4连杆体两端面的加工11 1.5.5连杆体大、小头孔的加工11 1.5.6连杆螺栓孔的加工12 1.6确定各工序的加工余量、计算工序尺寸及公差12 1.6.1确定加工余量12 1.6.2确定工序尺寸及其公差13 1.7工时定额的计算13 1.8连杆体的检验28 1.8.1连杆大头孔圆柱度的检验28 1.8.2连杆体、连杆上盖对大头孔中心线的对称度的检验29 1.8.3连杆大小头孔平行度的检验29 第二章夹具设计29 2.1问题的指出30 2.2夹具设计30 1)定位基准的选择30 2)夹紧方案30 3)夹具体设计30 4)切削力及夹紧力的计算30 2.3导向装置的选择31 2.4定位误差分析34 结论36 致谢37 参考文献38