最新机械制造工艺学05(夹紧装置)教学讲义ppt.ppt

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1、机械制造工艺学05(夹紧装置)1、按定位夹紧元件的等速移动或转动原理实现定心、对中夹紧（六）联动夹紧机构：用于同时有几个点对进行夹紧或同时夹紧几个工件的场合1、多点夹紧机构浮动夹紧机构2、多件夹紧机构（1）平行式多件夹紧（2）对向式和复合式多件夹紧：例（3）依次连续式多件夹紧3、夹紧与其它动作联动四、工件夹紧方案设计及夹紧力计算举例（一）工序加工要求：可采用粗、精双轴转盘铣床（二）定位夹紧方案（三）夹紧力计算及夹紧元件的确定：加工中切削力是变化的，应按最不利的情况确定夹紧力铣刀处于O1位置时的铣削力为：支反力简化

2、为R1、R2，摩擦因数取μ=0.3，则：得：取安全系数K=2.5，则：最终，选用直径150mm的气缸，当气体压力为0.5MPa时，可以产生8584N的拉力。单向作用活塞式气缸双向作用活塞式气缸薄膜式气缸增压器工作原理气动增压器气动增压器原理图图2-90定位元件与导引元件之间的位置要求图2-91接头零件图图2-92接头零件铣槽工序定位方案图2-93接头零件铣槽工序夹紧方案图2-94接头零件铣槽工序夹紧方案图2-95接头零件铣槽工序夹紧装置原理图习图2-1习图2-2(f)(g)Module6:Entertainmen

3、tUnit1ShesaidChinawasaveryexcitingplaceLead-in:1.Doyoulikelisteningtomusic?2.Whatdoyoulikedoingwhenyouarefree?3.What’syourfavoriteentertainment?EntertainmentWhatdidhesay?Ilikefootball.Hesaid(that)helikedfootball.Whatdidshesay?MyfavoritebandisS.H.E.Shesaidherf

4、avoritebandwasS.H.E.ListenandreadIndirectSpeechDirectSpeechShesaidthatshewaswithsomeclassmates.Shesaid,“I’mwithsomeclassmates”.Shesaid,“I’mstudyingChinese.”Shesaidthatshemissedherparents.“Chinaisaveryexcitingplace,”shesaid.ShesaidthatshewasstudyingChinese.She

5、said,“Imissmyparents.”ShesaidthatChinawasaveryexcitingplace.AWhispergameS1WhisperthemessagetoS2.thenS2whispertoS3aboutwhatheheard,andsoon.Thelastoneofeachteamstandsupandreports:Hesaidthat…Listenandwritenotes1.Whoisspeaking?2.Wheredoesittakeplace?3.Whattimeofd

6、ayisit?SallyMaxwellandChenHuan(arespeaking)IttakesplacesatRadioBeijing.It’slateatnight.Answerthequestions,Usethewordsintheboxtohelpyou.1.WhatdoesthemansayaboutSally?2.whatdoesthemanthinkofthemusic?3.Whatdoesthemantellthelistenerstodoiftheyareawake?4.Whatdoest

7、hemantellthemtodoiftheyaretoosleep?amongawakebelievebesidecheerclapfantasticplentysleepworryHesaysthatsheplaystheviolinreallywell.It’sfantastic.Hetellsthemtostandbesidetheirbedsanddanceandcheer.Hetellsthemtostayinbedandclapyourhands.Listenandanswerthequestion

8、sWhydidn’tBettyhearSally’sinterviewontheradio?WhatdoesSallythinkisthemainreasonforhervisit?WhydidDamingwanttocapandcheer?WhydoesBettythinktheyshouldlookafterSally?Becauseshewastoosleepy.T