最新零件公差材料上课讲义.doc

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1、零件名称常用材料一般热处理要求定位圈45HRC45-50浇口套T8A、T10AHRC53-57定模座板、动模座板、垫块Q235 定模板、动模板45HRC30-35型芯、型腔（镶件）CrWMn、Cr12MoV等HRC53-58导柱、导套T8A、T10AHRC50-55推杆（推管）拉料杆、复位杆T8A、T10AHRC50-55推板、推件杆固定板、支承板、推件板 45HRC30-35序号相关配合零件配合松紧程度配合要求配合尺寸测量值1定位孔 H9/f9 定位圈2浇口套 H7/m6 定模板3导套 H7/m6 定模板4导柱 H7/m6 动模板5导柱 H7/f7 导套6型芯、型腔 H7/m6 动模

2、板、定模板7拉料杆、复位杆等 H7/f7 动模板Thedaywaslikeanyotherdayinhislife,Tomwalkedpasttheshoponthestreetcomer.Hestoppedtolookatthefrontrowofshoes,andhefelthappytoseethatthepairofshoeshewantedverymuchwerestillthere.Lookingdown,hefeltsorryforhimself.Hereallywantedtohavethemforhisbirthday.Hesadlywalkedawayandthou

3、ghthowtotellhismotheraboutit.Heknewshewouldgivehimanythinghelikedifshecould.Buthealsoknewverywellshehadlittlemoney.Hedecidednottogohomeatonce,ashelookedworriedandhismotherwouldnotice(注意)it.Sohewenttotheparkandsatonthegrass.Thenhesawaboyinawheelchair(轮椅).Henoticedthattheboymovedthewheelwithhishan

4、ds.Tomlookedathimcarefullyandwassurprisedtoseetheboyhavenofeet.Helookedathisownfeet.“It'smuchbettertobewithoutshoesthanwithoutfeet,”hethought.Therewasnoreason(理由)forhimtofeelsosorryandsad.Hesentawayandsmiled,thinkinghewashappier.1．Tompassedtheshop______.　　A．onfoot　B．bybusC．bybike　D．inacar2．Whydi

5、dTomstopinfrontoftheshop?Becausehewanted______.[]　　A．tobuytheshoes　B．tolookattheshoesheliked　　C．tolookattheshoesintheshopwindow　D．tolookattheshoesonthefrontrow3．Thepairofshoeshelikedwas______.[]　　A．tooexpensiveB．quitecheap　C．notthere　D．notsoldyet4．Tomwentintotheparkbecausehe______.[]　　A．wasthink

6、inghowtotellhismotheraboutitB．wantedtoseetheboy　　C．didn'twanttomakehismotherworried　D．hefeltsad5．FromthestorywecanknowthatTom______.[]　　A．likednewshoesverymuch　B．lovedhismotherbest　　C．didn'twanttogotoschool　　D．didn'twanttostayathome<2>Peoplesometimesliketoreadstoriesofdogsverymuch.Theythinkthatd

7、ogsaremuchclevererthancats,sheep,cowsorotheranimalsintheirhomes.Oneofmyclosefriends,Bob,hasaverylargepolicedognamedJack.EverySundayafternoon,BobandJackhaveawalkintheparknearby.Jacklikesthesewalksverymuch.OneSundayafternoon,I