機(jī)械磨具外文翻譯資料

外文文獻(xiàn)資料Generalall-steelpunchingdie’spunchingaccuracyGeneralall-steelpunchingdie’spunchingaccuracyAccuracyofpanelpunchingpartisdisplaythepressaccuracyofthedieexactly.Buttheaccuracyofanypunchingparts’lineardimensionandpositionalaccuracyalmostdependontheblankingandblankingaccuracy,.Sothatthecompoundmouldofcompoundpunching’saccuracy,istypicalnessandrepresentationinthemajority.Analyseofthedie’saccuracyFortheanalyseofpracyicableinaccuracyduringproductionofdiestoinactivation,wecouldgetthetendencywhenitisaugmentationinmosttime.Fromthiswecouldanalysetheelements.Whenthenewpunchdiesptintoproductiontothefirstcuttergrinding,theinaccuracyproducedcalledinitialerror;ifthediegrindingmorethantwentytimes,untilit’sdiscard,theinaccuracycalledconventionalerror;andbeforethediesdiscard,thelargesterrorofthelastbatchpermit,calledlimitingerror.atjobsite,theevidencetoconfirmlifeofsharpeningisthehigheroftheblanking,punchedholeorpunchedparts.Becauseallfinishedpartshadbeenblanked,soitisespeciallyforthecompounddies.Therefore,theanalyseofburrandmeasurementisespeciallyimportantwhendothemasenterprisestandardizationorcheckedwith<<theheightofpunchingpart>>.Theinitialerrorusuallyistheminimalthroughthewholelifeofdie.Itsmagnitudedependontheaccuracyofmanufacture,quality,measureofthepunchingpart,thicknessofpanel,magnitudeofgapanddegreeofhomogeneity.Theaccuracyofmanufacturedependonthemanufactureprocess.Forthe1mmthickedcompoundpunchingpartmadeinmediumsteel,theexperimentalresultandproductivepracticeallprovethattheburrofdieswhichproducedbysparkcuttingarehigher25%~~30%thanproducedbygrinder,NCorCNC.ThereasonisthatnotonlythelatterhavemoreexactmachiningaccuracybutalsothevalueofroughnessRaislessoneorderthantheformmer,itcanbereached0.025μm.Therefore,thedie’sinitialblankedaccuracydependsontheaccuracyofmanufacture,qualityandsoon.Thenormalerrorofthepunchdieisthepracticableerrorwhenthefistcuttergrindingandthelastcuttergrindingbeforethedieproducethelastqualifiedproduct.Astheincreaseofcuttergrinding,causedthemeasurethenaturewearofthediesaregradualincreasing,theerrorofpunchingpartincreasealso,sothepartsareblewproof.Andthediewillbeunused.Theholeonthepartandinnerbecausethemeasureofwearwillbesmallandsmallgradually,anditsoutsideformwillbelagerinthesamereason.Therefore,theholeandinnerforminthepartwillbemademouldaccordingtoone-waypositivedeviationornearlyequaltothelimitmaxmeasure.Inlikemanner,thepunchingpart’sappearancewillbemademouldaccordingtoone-waynegativedeviationornearlyequaltolimitminimeasure.Forthiswillbebroadenthenormalerror,andthecuttergrindingtimeswillbeincreased,thelifewillbelong.談Th籮e黑li泄mi爭t鹽er爭ro澆r詠in演p雪u胞nc旱hi振ng輩p橫ar假ts吃a剩re界t蠶he猛m蠶ax盒d煩im贏en跡si息on潮e飾rr暑or乳w虛hi膀ch韻p耽ra砍ct倍ic帶ab猶le峰a偽ll庭ow船ed隔i掀n君th慎e薄pa他rt大s天wi篇th局l豆im泰it須e妥rr不or途.謝Th朝is梳k罪in容d說of諷p惱ar眨ts綢u仍su彩al爺ly摟a敬re喉t社he左l鐮as能t笑qu岸al炎if扇ie角d相pr敲od新uc臨ts牧b雨ef盆or妻e倍th從e貪di摩e筒di量sc割ar呼d.筍Fo盈r祥th更e期al慶l坦cl晝as轉(zhuǎn)se陷s鳥of哪d愉ie臘s,放i會(huì)f循we味疊an在al吊ys響e侮th嫩e廊fl松uc誦tu個(gè)at經(jīng)e,透t娘en渣de浙nc淹y筍of摧i趣nc尊re獻(xiàn)as摸e屑an雄d烈de蓮cr咳ea尿se袍a抽nd況l癢aw旗w協(xié)hi蘇ch讓a綁pp材ea戰(zhàn)re秩d打in座t巨he鞭d畫i蜜e針’桂s棵wh須ol光e桑li溪fe敢,貼we軌w連il野l(fā)移fi遵nd賀t蛛ha嘴t耽th干e斯ma賀st膜er定o貫f串th嬸e栗e隙rr索or轉(zhuǎn)a翼re截c便ha純ng誘el仁es包s;唐t漠he療e胖rr適or辦t益ha憲t鋒be覆ca引us咸e消th鞠e夫ab慎ra溉de吹o喂f躬th辭e曲cu幣tt踏er泳a吵nd祖i棕mp棋re饒ss晚io五n也wi蕩ll墨b晌e謹(jǐn)as敵t鍋he貓c長ut坦te店r喉gr祖in每di渡ng痰t惹im營es勺i己nc捐re心as院ed曉a俗t關(guān)th吉e即sa雄me接t蒸im歡e.晴A喚nd袋t鉤ha蜂t跑wi慮ll疏c役au憑se堵t毒he液e突rr至or洪o說ve析rs是iz部e符gr皇ad胸ua鹿ll蜜y;惰a育nd侵a柳ls右o穴ha偷ve敢a此no奇th接er確p受ar克t串er松ro腳r哀ar歡e敞un復(fù)co掛nv濫en接ti恭on供al糧,泄u值nf奔o(jì)r軌es快ee食n.睡T訊he倉re竭fo捆re植,挨ev哄e(cuò)r豪y關(guān)di擋e蠻’尼s磁e杜rr蛾or伯a(chǎn)予re離c磁om時(shí)po策se撐d揮of玻f比ix搬ed堆e設(shè)rr職or攔,廈sy饒st漠em陸e歪rr亞or慮,廈ac傳ci執(zhí)de貝nt紗e膚rr斬or鞏a乘nd芬s耽o眠on妨.煮1.妥f靈i拖xe標(biāo)d劑er枯ro答r雨At影t膽he毫w著ho狗le值p趟ro碗ce絞ss澤w懼he樓n凈th筋e按N尿ew膝p章un唇ch虎in撫g支di亭e狂be息tw磁ee宜n晶ju我st冒i前np啦ut良p堤ro劇du編ct限io域n帝to耗d予is脹ca夕rd坑,因th煩e奴ch犬a(chǎn)n索ge幻le胸ss虎m孫as叼te民r愛er易ro伐r詳th聚at充i千n我qu哲al皺if煌ie怨d狡pa裙rt岡a帖re轎c丘al逼le毒d頂fi涂xe暗d細(xì)er反ro濕r.緊I賠t勉’氏s件ma罷gn鎖it這ud餅e籌is裂t系he犧d齒ev促ia累ti襪on樂w莫he菠n趟th途e忽di捉e驗(yàn)pr貿(mào)od喂uc騰ti狗on尖q吳ua鞋li梯fi養(yǎng)ed濁p逃ro僻du步ct豬s蝦be巡fo查re臨t降he端f刪ir晌st速c抬ut甜te遇r母gr金in斷di昂ng協(xié).縱Al啞so懷i遙s由th廣e望in擦it紋ia悉l既er壞ro演r,痛b居ut磚t扯he稿d經(jīng)ie阻h彈av虛e兇in遵it單ia稠l塞pu臣nc芝hi姨ng陪a噸cc章ur是ac茅y脹at常t熊hi項(xiàng)s唐ti維me花.樸Be澡ca旱us下e眨of極t謠he鍬a劇br計(jì)ad螺e令of哭p羞ar蒙ts蹦,渣th聞e海di信e技af挎te晚r雅gr貢in澤di予ng余w脹il簡l衛(wèi)be錄c盲ha呼ng轟e嫌th稻e豆di淚me柔ns膠io枕n顫er金ro午r.飄A辭nd夜t涂he代i善nc枯re幻me價(jià)nt根o昨f微de戲vi連at罪io悲n映wi伴ll被o玻ve扎rs兇iz鈔e什as餃t田he容t磨im笛es窄o跌f模cu斃tt蹦er標(biāo)g牢ri摸nd剪in濤g.險(xiǎn)S故o擠th墊e隙pu朋nc錄hi仍ng煌a肢cc卵ur窮ac死y嘉af邀te友r油cu壯tt吵er夜g粒ri命nd璃in脈g錢al經(jīng)so槐c紛al園le成d役“打gr趨in鄭di挨ng怪a火cc故ur案ac沉y璃”臘a爪nd躲l報(bào)ow含er杏t蔥an嫌i醫(yī)ni烈ti柔al酷a脈cc鳳ur再ac雷y.俘T濾he獅f難i英xe碑d嫩er飯ro儉r絡(luò)de季pe萌nd稠o余n虧th痕e全el謹(jǐn)em輝en貿(mào)ts葡f個(gè)ac逃to慧r恨as部f民ol葉lo宣we珠d其:嘉(1饑)驕th雷e本ma個(gè)te惱ri辭al首,遺s緩or脹ts摧,發(fā)st踢ru駕ct季ur塘e,卷(芒fo籠rm棕)餐di蛇me壯ns藏io晨n,跳a木nd設(shè)t造hi輩ck銹o竹f猾pa拜ne悲l吉th慈e筋ma畜gn夜it遺ud煤e劫of常p判un壟ch越in獵g蝶ga漢p夠an孝d女de吐gr驚ee腥o志f銳ho歷mo缺ge背ne浴it宿y童ar琴e箏ha塑ve堂a柔i軋mp毒or勁ta做nt扶e圈ff攻ec什t傲fo廁r竿th災(zāi)e抓di盾me廊ns具io百n朝ac濟(jì)cu逐r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a幣rs觸c亂ou升nt機(jī)ry耕a昂nd駱s胸o幟on精S丙wi由tz扭er既la配nd貓a班nd米J豎ap死an腸,句ha慌s栽co暗nd奏uc騎te勻dt岡he執(zhí)t甲ho常ro敏ug責(zé)h達(dá)re庸se瑞ar鏈ch武t塌o章th貌e辣el渡ec側(cè)tr茶ic挨al塵f噸in賺is范hi渣ng裳e附qu易ip友me燥nt遙a竭nd蛾a擾bi君gg柔er譯i搜mp擠ro洽ve喂me菜nt渡,浴ma滿ke女s狗fu趙nc脆ti場on童c柱om毯pl玩et嘴e到hi烈gh詳a肆cc嶼ur崗ac糾y闊NC鹽a敘nd晨t英he圍CN齊C怠li辦ne請c濕ut低te騰r,臺(tái)t致he亮p窯ro掏ce術(shù)ss勇in星g勤pr給ec廟is疾io撫n柏ma界y對re易ac奏h應(yīng)±0喇.0菠05鋒~細(xì)0雜.0酒01常mm磚,e露ve匯n繳is周s攜ma揮ll養(yǎng)er駛.蠻Th累e葡pr泛oc駕es勿si剩ng座s土ur絹fa國ce貝r躍ou齊gh宴ne爪ss方R職a患va定lu誦e屆ca芽n濁ac顛hi俗ev錢e0汪.4復(fù)m耗u石m.蹲A噸cc行or浸di惹ng卷t鉤o潛th食e永re昌ce攜nt盲y米ea能rs箭t賄o周th思e霉do貌me擋st揪ic緊1咬2骨pr決od聯(lián)uc郊ti架on需li警ne勤s卡cu覺tt嶄er剝f棕ac勻to閥ry巾i借nv網(wǎng)es池ti同ga障ti銀on銀a惜nd慈s仰tu巡dy鉤,錄th帆e染do蹤me溉st赴ic童al鍛ly段pr校od悅uc診ed俊l騎in遼e煌cu承tt幕er博p斃ro糊ce貨ss帥in膨g象pr奏ec舞is武io討n猶di壁ff壩er抓en倆t倡fa興ct封or奪y剃di姻ff料er怎en受tm梅od協(xié)el蔑l真in焰e犬cu奧tt井er錯(cuò)m征ig屈ht藏r化ea杰ch嘴±乎0.知00躁8星~定±0置.0序05暫mm拒,叫g(shù)e殊ne劃ra敏ll擠y粘al吃l馬in震±0襯.0定1m飄m番or幅b嗽ig裂ge施r則so皂me上wh線at框,批wa撥s偉in框di腸vi堂du袍al拾a喝ls遼o由ca族n念ac謀hi集ev刺e±旨0.吐00貪5m鼓m,匪t亂he袖p臣ro能ce癥ss聾in貞g蓄su堵rf飽ac愚e橫ro覽ug轉(zhuǎn)hn蹤es孔s俱Ra籌v澆al暖ue音w陶as田b田ig修ge挎r倦th裹an爸1.港6燙μ嗓m.舍H勾ow絡(luò)ev弟er壩,戲th喬e求el舉ec膛tr冒ic那al似f豆in猾is佩hi惜ng盒a萬bl喘at伴io束n候me堡ta櫻l歐su遣rf掌ac辣e捷th饞us竹t哥he升c江h(huán)a補(bǔ)ng斜e啦an椒d艙th控e量da記ma貞ge矩m少ac姓hi貨ne楊d怒su秧rf戒ac螺e園me酷nt匪al頃s汪tr覆uc蠢tu蠻re褲c匹ha煙ra禮ct膝er芳c殊an秤n孔o(hù)t裹c(diǎn)巖ha遮ng翻e,分o妄nl帽y遵if半w熊it奇h眼ru準(zhǔn)bs德t苗ru腐nc扛at傲es留o跌r具ot潤he甘r符wa傾ys痕r籃em境ov記es殊t籃hi摟s申ha督rm疫fu撕l塵le訓(xùn)ve允l.陡T釣he虛re蜜fo允re籠,墊me熱re巾ly絕u折se綁s紀(jì)el知ec萍tr膀ic繭it勁y東m主a禮ch麻in企in談g,反i大nc允lu回di批ng薯t新he回s球pa開rk三c選ut判ti禮ng依a紫nd偶t窗he唯e號(hào)le蔥ct病ri糕ci溫ty杜p只er牲fo割ra災(zāi)ti逼on號(hào),眉ac勤hi霜ev氏es毒w勝it血h衫di敏ff閱ic耀ul陽ty江p媽un鍛ch門in熊g,同e乖sp傻ec字ia燦ll太y浪hi乎gh政a栽cc責(zé)ur貍ac基y,恰h吊ig跳h戒li戲fe宜p詞un勻ch閣in傷g鉗di比e瓣to記s奏iz湊e隸pr單ec誤is籠io產(chǎn)n征an挎d案wo完rk窯c島om悶po務(wù)ne黎nt冤s援su薦rf鏟ac密e細(xì)ro膜ug缺hn喚es是s猜Ra圾v叛a(bǔ)l智ue陡r咽eq毛ue張st漏.Withpreciselyrubstruncatesthelawmanufacturepunchingdie,speciallymakesthehighaccuracy,thehighlifepunchingdie,suchas:Thinmaterialsmallgapcompoundpunchingdie宴,倉mu羅lt松i-血l愧oc撲at黎io碧ns睛c聾on候ti敘nu赴ou跨s鹿ty昏pe鉤c代om酸po是un宣d軌di問e熄an逝d蠻so囑o嘆n,葉h起as柜t蘇he素s慘iz式e紡pr咳ec旺is削io繪n蝴hi骨gh波,雹th頃e定wo瓶rk價(jià)c勾o為mp榨o旗ne刺nt未s怖m(xù)a全ch通in御ed庭s納ur頌fa釀ce廟r閑ou捕gh糊ne顆ss生R牛a廈va拴lu法e木is伶s渾ma霉ll妨,鵲th彈e叢mo灰ld樣l上if畏e塌hi福gh階er鑰c愉ha偉ra包c(diǎn)t僚er頸is便ti番c.復(fù)I挎ts敏p脫ro漢ce獅ss棋in滲g引cr剃af揪t富at恨p院re吼se拘nt期c滲ha床ng銷ed薦t憐he滋e于le診ct厲ri駛ca霧l棕fi強(qiáng)re嘴b冰y感th喝e代pa馳st胸o餓rd須in例ar嫩y見en詢gi紡ne鼓b羽ed肚r需ou略gh蜜m趣ac滾hi熄ni巖ng躬s桃pa粉rk轟c岸ut特ti鋸ng盒o棉r(nóng)界th裕e般el幣ec剩tr顯ic稻it徹y偏pu煙nc壩he殺r石ro霸ug響h頃ma悔ch排in責(zé)in殊g趕,拘f牌in幅al縫ly乘p統(tǒng)re后ci意se味ly遷r逗ub尼s永tr話un最ca羽te蒸s,醉a兩ls忌o狠fr岔om悠t著ak腸es楊s吸ha稅pe時(shí)r第ub堪s,嘗o滑pt新ic塑s脊cu就rv譽(yù)e綢ru唱bs住,葬t(yī)h翼e乖ma暴nu持al雞g吃ri評d翅re貨fe挪re廚nc始e耐ru墳bs胡g臟ra稅du側(cè)al刪ly姓f弱il妻te養(yǎng)rs竊t既he誠c蠶on仗ti悲nu醫(yī)al鄭p元at餡h籃gr看id旨r和ef由er鉛en肅ce堅(jiān)t暮o刊ru憂b弓an念d紡NC砌a脖nd俱t至he血C麻NC警c謊on嘩ti憲nu垃al帝p榜at振h濟(jì)gr很id垮r旋ef喉er筑en惹ce授r充ub吩s,醉P惱ro小ce隸ss妹in童g正co雷ar可se茅ne灰ss艙m訴ay預(yù)r劃e然ac冠h密±名0.果00倡1水~因0.姐00案05賣mm腿,昌th矮e標(biāo)pr料oc曉es虎si榴ng集s陳ur綁fa恒ce胞r浸ou塑gh縮ne柔ss未R嚼a防va絮lu苗e用ma培y鄰re刷ac判h洗0.行1揪~裙0.珠02稻5精mu峽m僵.筑Th胸er放ef存or脾e,早w川it楊h狠th策is慶c柱ra像ft惑m鍋an鞭uf翻ac徒tu庫re的t抽he梯d叫ie從,癢r壯eg予ar裝dl恒es術(shù)s虎of接t孕he棕s餡iz購e認(rèn)pr臂ec釋is共io蛇n,怪t采he具w臨or女k患co芬mp監(jiān)on命en席ts驢s射ur曉fa情ce冠r顫ou枯gh掃ne料ss龜,做al煩l韻ca合n益sa胃ti緊sf義y淺di版e,胸e歉ac溜h籃ki去nd堅(jiān)o葉f泉co勤mp釋ou英n冠d池r膛eq疤ue莖st原,乳th混e插di艱e候is隱e犬sp培ec咬ia息ll貫y薯hi跨gh濁er繞t塵ha栽n蚊th湖e踢el論ec在tr懷ic款al簡f漸in淺is靈hi炕ng壓c跡ra恩ft傾m虜an協(xié)uf都ac誘tu譜re杠s堤ca勤le企.(4)gapsizeanddegreeofhomogeneitytheflangeandothersheetformingsgenerallyallmustfirstpunching(fallmaterial)theplatetolaunchthesemifinishedmaterials,afteralsohastheformingtofallthematerial,theincisionobtainsthesingleendproducttoflush.Thereforepunchingthework,includingiscommonlyusedpunchinghole,themargin,cutsideandsoon,regardingeachkindofsheetpressingpartallisnecessary.Thereforepunchingthegaptoflushesaoutforminchprecisiontohavethedecisiveinfluence.punchingthegapsmallandiseven,maycausepunchingthesizegainhighaccuracy.Regardingdrawability,iscurvingandsoonmould,thegapgreatlywilldecideincreasesflushestheoralareasizeerrorandthesnappingback.Thegapnon-uniformitycancausetoflushaburrenlargesandincurscuttingedgethenon-uniformattrition.(5)rammingequipmentelasticdeformationIntherammingprocessAfterthepunchpressloadbearingcanhavethecertainelasticdeformation.Althoughthiskindofdistortionquantityaccordingtoflushesthepressurethesizetochangealsotohavetheobviousdirectivity,butonthepressingpart,mainlyistohasthevolumerammingarcherytargetstamping,embosses,theequalization,thepressureisraised,thewave,flushescrowds,theshape,theflange,hitsflatly,thinlychangesdrawabilityandsoonthecraftworkpunchingformingflushes,hasthesignificantinfluencetoitsrammingaspectsizeprecision外文譯文普通全鋼沖模的沖壓精度分析沖壓零件的精度是面板顯示媒體模具的精度完全正確。但其準(zhǔn)確性的沖壓零件的尺寸和位置精度線性幾乎取決于沖裁下料精度。所以復(fù)合模具的復(fù)合沖壓的準(zhǔn)確性在普通沖壓的眾多種類與不同結(jié)構(gòu)的沖模中，最具典型性和代表性。沖模的沖壓精度分析對沖模投產(chǎn)至失效報(bào)廢各個(gè)時(shí)期沖件的實(shí)際誤差分析，可以看出其增大的時(shí)期及趨向，從而分析其增大的因素。新沖模投產(chǎn)至第一次刃磨前沖制沖件的誤差即所謂的初始誤差；沖模經(jīng)過20次左右刃磨至失效報(bào)廢前沖制的沖件誤差稱之為常規(guī)誤差；而沖模失效報(bào)廢前沖制的最后一批合格沖件的允許最大誤差稱之為極限誤差。在現(xiàn)場，確定沖模刃磨壽命的依據(jù)是沖件沖孔與落料的毛刺高度。由于任何成形件都具有沖裁作業(yè)（毛坯落料或沖孔），對于復(fù)合模尤為如此。所以，沖件毛刺高度的觸模檢查和測量并按企業(yè)標(biāo)準(zhǔn)或JB4129-85《沖壓件毛刺高度》對照檢測就顯得十分重要。沖模的初始誤差通常是沖模整個(gè)壽命中沖件誤差最小的。其大小主要取決于沖模的制造精度與質(zhì)量及沖件尺寸、料厚以及間隙值大小與均勻度。沖模的制造精度及質(zhì)量又取決于制模工藝。對于料厚t≤1mm的中碳鋼復(fù)合沖裁模沖件，實(shí)驗(yàn)結(jié)果與生產(chǎn)實(shí)踐都證明，電火花線切割制造的沖模沖件毛刺高度比用成型磨或NC與CNC連續(xù)軌跡座標(biāo)磨即精密磨削工藝制造的沖模沖件要高25%～30%。這是因?yàn)楹笳卟粌H加工精度高，而且加工面粗糙度Ra值要比前者小一個(gè)數(shù)量級(jí)，可達(dá)到0.025μm。因此，沖模的制造精度與質(zhì)量等因素決定了沖模的初始沖壓精度，也造就了沖件的初始誤差。沖件的常規(guī)誤差是沖模經(jīng)第一次刃磨到最后一次刃磨后沖出最后一個(gè)合格沖件為止，沖件實(shí)際具有的誤差。隨著刃磨次數(shù)的增加，刃口的自然磨損而造成的尺寸增量逐漸加大，沖件的誤差也隨之加大。當(dāng)其誤差超過極限偏差時(shí)，沖件就不合格，沖模也就失效報(bào)廢。///////沖件上孔與內(nèi)形因凸模磨損尺寸會(huì)逐漸變小；其外形落料尺寸會(huì)因凹模磨損而逐漸增大。所以，沖件上孔與內(nèi)形按單向正偏差標(biāo)允差并依接近或幾乎等于極限最大尺寸制模。同理，沖件外形落料按單向負(fù)偏差標(biāo)注允差并依接近或幾乎等于極限最小尺寸制模。這樣就使沖件的常規(guī)誤差范圍擴(kuò)大，沖?？扇心ゴ螖?shù)增加，模具壽命提高。沖件的極限誤差是具有極限偏差的沖件所具有的實(shí)際允許的最大尺寸誤差。這類沖件通常是在沖模失效報(bào)廢前沖制的最后一批合格沖件。對各類沖模沖件誤差在沖模整個(gè)壽命中出現(xiàn)的波動(dòng)、增減趨向及規(guī)律等進(jìn)行全面分析便可發(fā)現(xiàn)：沖件誤差的主導(dǎo)部分是不變的；因刃口或型腔的自然磨損而出現(xiàn)的誤差增量隨沖模刃磨沖數(shù)增加而使這部分誤差逐漸加大；還有部分誤差的增量是非常規(guī)的、不可預(yù)見的。所以，各類沖模沖件誤差是由因定誤差、漸增誤差、系統(tǒng)誤差及偶發(fā)誤差等幾部分綜合構(gòu)成。1、固定誤差新沖模在指定的沖壓設(shè)備上投入使用至失效報(bào)廢的整個(gè)（總）壽命過程中，其合格沖件誤差的主導(dǎo)部分固定不變即所謂固定誤差。其大小就是新沖模第一次刃磨前沖制的合格沖件的偏差，也即沖模的初始誤差，而此時(shí)的沖模具有初始沖壓精度。刃磨后的沖模，因其工作零件（凸、凹模）磨損而改變尺寸誤差，使沖件識(shí)差增量隨刃磨次數(shù)增加而逐漸加大，故沖模刃磨后的沖壓精度亦稱“刃磨精度”比其初始精度要低。沖模沖件的固定誤差取決于以下各要素：（1）沖件的材料種類、結(jié)構(gòu)（形狀）尺寸及料厚沖裁間隙的大小及其均勻度對沖裁件的尺寸精度有決定性的影響。不同沖裁工藝、不同材料種類與不等料厚，間隙相差懸殊，