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Machining:AnIntroductionIntermsofannualdollarsspent,machiningisthemostimportantofthemanufacturingprocesses.Machiningcanbedefinedastheprocessofremovingmaterialfromaworkpieceintheformofchips.Thetermmetalcuttingisusedwhenthematerialismetallic.Mostmachininghasverylowset-upcostcomparedtoforming,molding,andcastingprocesses.However,machiningismuchmoreexpensiveforhighvolumes.Machiningisnecessarywheretighttolerancesondimensionsandfinishesarerequired.TheMachiningsectionisdividedintothefollowingcategories:Drilling:IntroductionDrillingiseasilythemostcommonmachiningprocess.Oneestimateisthat75%ofallmetal-cuttingmaterialremovedcomesfromdrillingoperations.Drillinginvolvesthecreationofholesthatarerightcircularcylinders.Thisisaccomplishedmosttypicallybyusingatwistdrill,somethingmostreaderswillhaveseenbefore.Thefigurebelowillustratesacrosssectionofaholebeingcutbyacommontwistdrill:Thechipsmustexitthroughtheflutestotheoutsideofthetool.Ascanbeseeninthefigure,thecuttingfrontisembeddedwithintheworkpiece,makingcoolingdifficult.Thecuttingareacanbeflooded,coolantspraymistcanbeapplied,orcoolantcanbedeliveredthroughthedrillbitshaft.Foranoverviewofthechip-formationprocess,seetheChipFormationSection.DrillingCharacteristicsThecharacteristicsofdrillingthatsetitapartfromotherpoweredmetalcuttingoperationsare:Thechipsmustexitoutoftheholecreatedbythecutting.Chipexitcancauseproblemswhenchipsarelargeand/orcontinuous.Fordeepholesinlargeworkpieces,coolantmayneedtobedeliveredthroughthedrillshafttothecuttingfront.Ofthepoweredmetalcuttingprocesses,drillingonadrillpressisthemostlikelytobeperformedbysomeonewhoisnotamachinist.DrillPressWorkAreaAviewofthemetal-cuttingareaofadrillpressisshownbelow.Theworkpieceisheldinplacebyaclampsincecuttingforcescanbequitelarge.Itisdangeroustoholdaworkpiecebyhandduringdrillingsincecuttingforcescanunpredictablygetquitelargeandwrenchthepartaway.Woodisoftenusedunderneaththepartsothatthedrillbitcanovershootwithoutdamagingthetable.Thetablealsohasholesfordrillovershootaswellasweightreduction.Athree-jawchuckisusedsincethreepointsdetermineacircleintwodimensions.Four-jawchucksarerarelyseensinceoffsetofthebitisnotnecessary.Thenextsectioncontainsillustrationsofdrillbitchucks.Togetanideaofthedifferingconfigurationsofthreeandfour-jawchucks,pleaseseetheequivalentlathechucks.織Tu闊rn禁in儲(chǔ)g:崖E拍ng此in桑e臭La膛th克e靠Tu啦rn咳in芽g唯is康a婆no抱th洋er粘o耍f華th豬e失ba火si蟻c拴ma左ch側(cè)in施in家g拒pr牽oc悠es矛se坊s.侄I藏nf救or雪ma求ti凍on尚i標(biāo)n架th寫is侮s汪ec涌ti州on煩i雕s蜓or游ga慣ni粥ze獅d照ac么co未rd齡in縱g工to慮t啄he將s等ub壁ca狠te物go愿ry府l際in松ks換i折n川th步e僵me巧nu竊b青ar采t依o動(dòng)th牧e夠le庫ft輛.脂?翅Tu良rn命in于g手pr稍od科uc巖es梳s瘡ol旬id仍s晃of什r絡(luò)ev提ol壟ut炸io發(fā)n榮wh星ic包h兆ca變n擊be靜t扣ig便ht鎮(zhèn)ly炊t岡ol霜er支an加ce沿d咱be血ca燒us碑e蘿of懇t哪he臥s厭pe樹ci鉛al塊iz律ed鄙n且at搜ur綠e佛of脫t獸he魔o欺pe神ra煙ti塞on泉.向Tu粥rn見in澇g留is酒p魯er扁fo貫rm隙ed母o災(zāi)n彼a充ma抓ch處in縮e寨ca移ll筑ed躬a宴l鏈at垮he接i倒n繡wh漆ic震h榜th么e越to伐ol術(shù)i攝s輛st持at占io閘na拘ry午a芝nd活t稠he技p巷ar矮t法is捧r橡ot菊at壘ed宜.刊Th埋e也fi誘gu昨re象b止el默ow禁i弱ll潮us湊tr其at淋es位a根n慈en丹gi脊ne侮l壓at路he導(dǎo).繼La賢th蔑es學(xué)a涉re海d蛙es航ig簡(jiǎn)ne渠d樂so粱le莖ly持f黨or拜t梨ur濾ni標(biāo)ng蔽o抵pe拒ra辰ti亞on酬s,濟(jì)s孔o(hù)螞th挨at恥p際re怨ci摩se辟c柄on團(tuán)tr膛ol擋o遮f組th聯(lián)e爆cu妄tt額in柄g鈴re跑su粉lt的s脆in貢t喘ig羞h(yuǎn)t謝t閃ol匠er儉an鑼ce蒜s.格T兄he換w健or功k梨pi險(xiǎn)ec狡e在is叫m默ou絲nt鮮ed虛o饑n蛋th孟e轉(zhuǎn)ch商uc川k,銜w吉hi當(dāng)ch計(jì)r婦ot粉at衛(wèi)es巧r界el升at宮iv老e只to例t漿he澆s活ta建ti炮on晚ar耐y蘋to磁ol雄.卡Tu欲rn縣in吧g重Tu程rn軍in彩g皆re文fe豐rs窗t格o稍cu共tt拔in哥g和as瓦s豬ho沉wn鬼b廳el知ow爺.廳Th茄e飾te因rm肌"拿fa裂ci棟ng洽"證is連u氧se翁d姨to傅d洋es騎cr裁ib犯e秧re婚mo戀va烈l容of盤m還at母er谷ia憐l康fr劫om辭t續(xù)he它f煮la敘t膚en移d值of制a貢c掃yl往in隆dr弟ic錘al木p纏ar撈t,配a份s嫂sh纏ow枝n犧be踐lo慨w.董F槐ac確in警g上is惡o聚ft文en姜u選se海d厘to念i揚(yáng)mp蜘ro俯ve小t增he和f駛in織is城h核of不s出ur條fa壤ce燒s床th注at帳h嬸av更e腰be獨(dú)en疾p勵(lì)ar版te自d.躬Mi優(yōu)ll逼in雅g:尿I多nt妹ro臭du扎ct損io很n刊Mi底ll涌in絹g匆is紐a辣s高fu容nd劣am社en自ta紫l沉as捆d杰ri意ll渡in挺g吐am懇on鑄g記po薯we課re籌d彈me蓮ta綠l渴cu蝕tt翼in蟻g奔pr狠oc求es待se趣s.辭Mi喪ll懷in愛g紅is雕v全er爛sa齒ti集le舅f尚or偏a忽b果as削ic憶m撿ac貍hi價(jià)ni息ng糖p涉ro扭ce位ss碑,托bu厘t械be光ca讓us樹e萄th借e花mi踐ll笑in彩g徑se粒t有up宏h感as瀉s帽o不ma雪ny席d故eg旨re鑰es倘o夢(mèng)f異fr統(tǒng)ee尼do死m(xù),福m尚il株li偶ng尿i舒s折us芹ua黃ll舍y隸le太ss智a畜cc竊ur迅at幸e易th江an白雄tu樸rn借in巷g窩o綢r獎(jiǎng)gr詠in林di歲ng右u長nl告es鉗s伸es岔pe哲ci扒al怎ly蝦r蹤ig如id敲f旅ix剛tu貴ri抓ng著i緩s震im屬pl鄰em哭en購te混d.向漫Fo伐r裳ma蛇nu無al景m條ac鈔hi片ni析ng毯,雹mi斗ll病in婆g葡is辜e姑ss引en堪ti陳al雕t佩o框fa恥br爸ic紫at再e情an疼y泄ob亭je尋ct隨t齊ha隊(duì)t胞is滴n栗ot銷a廣xi鎖al泥l(xiāng)y龍s讀ym豪m(xù)e強(qiáng)tr枕ic平.桃Th蝴er曉e景is掉a罷w母id孝e艱ra烤ng秤e啊of汽d災(zāi)if草fe泥re映nt喘m滔il邀li舒ng幟m著ac太hi搬ne某s,纏r句an轎gi廣ng劫f蹲ro廟m房ma仇nu仙al牌l覆ig壤ht悄-d傳ut鑼y睛Br驗(yàn)id筍ge賓po歪rt移sa食?¢調(diào)t絹o伍hu富ge庸C選NC拿m月ac宜hi裂ne球s位fo島r饑mi改ll拌in芳g徹pa滲rt乞s蝶hu旦nd網(wǎng)re稻ds粒o銅f玩fe燥et硬l拾on瓶g.朽B雜el委ow梢i武s孩il殼lu賓st似ra丹te倉d數(shù)th早e踏pr放oc零es導(dǎo)s楚at殘t允he勁c翅ut鼠ti跟ng嶺a覆re唯a.休Mi傷ll滲in足g:侵C駛ol戚um號(hào)n-尚an厚d-誤Kn凳ee游M押an訪ua這l卸Mi隔ll饅Be咸lo本w川is詢i敵ll敢us序tr夢(mèng)at巨ed未a砍t絞yp感ic握al槍c裁ol畝um陷n-聯(lián)an徒d-嘉kn紫ee話t踢yp傅e堪ma攤nu湊al慚m召il橡l.似S賊uc鉆h利ma詞nu館al蘿m逐il國ls比a撞re杰c爐om鼓mo竭n且in認(rèn)j漏ob赤s竹ho妨ps比t鋼ha恢t符sp牧ec粘ia尼li級(jí)ze奴i紐n剖pa刮rt臨s揀th順at慧a尊re凍l糟ow織v辯ol銳um遼e薦an胖d廚qu梯ic管kl劈y額fa父br狗ic響at建ed哪.匯Su除ch嘆j都o(jì)b停s鞏ho捆ps自a當(dāng)re郊o(jì)隔ft許en費(fèi)t獻(xiàn)er欠me廳d擦"m鉛od脊el脖s獎(jiǎng)ho礎(chǔ)ps儀"賭be嫩ca威us楊e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