零件的結(jié)構(gòu)工藝性課件

ManufacturingProcessConsiderations

零件的結(jié)構(gòu)工藝性Castingstructure

鑄件結(jié)構(gòu)Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)Structureofdrillhole鉆孔結(jié)構(gòu)請(qǐng)點(diǎn)擊相應(yīng)標(biāo)題顯示其內(nèi)容ManufacturingProcessConsider1

Castingstructure鑄件結(jié)構(gòu)SandboxcoverOverflowPouringhead

上砂箱冒口澆口1.

Draft起模斜度:The1

20（≈3°）draftalongthedrawingdirectionofthepatternfacilitatestotakeoutthepatternwhilemolding.

鑄件造型時(shí)，為便于取出木模，沿脫模方向的表面做出1

20（≈3°）的起模斜度。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Ifthedraftisverysmall,itcanbeomitted,Ifnecessary,itcanbeincludedintechnical.起模斜度較小時(shí),在圖中一般不畫(huà)出,必要時(shí)可注寫在技術(shù)要求中。Sandbox下砂箱Model模型Cavity型腔Sand型砂Castingstructure鑄件結(jié)22.Filletsincastings鑄造圓角:

Theremustbearadiuswheretwosurfacesmeet,inordertoavoidsanddropswhileremovingthemouldandshrinkagecavityandshrinkagecrackwhilecooling.在鑄件表面相交處應(yīng)有圓角,以免脫模時(shí)砂型落砂,同時(shí)防止鑄件冷卻時(shí)產(chǎn)生裂紋或縮孔。Machinesymbol機(jī)加工符號(hào)請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容

Castingstructure鑄件結(jié)構(gòu)

Theintersectionlineisneededinordertodistinguishthevarioussurfaces.Theonewehaveprovidediscalledrun-outline.Therepresentationofatransitionlineissimilartothatofintersectionline.Theonlydifferenceisthattheendoftherun-outlineisnotconnectedwiththecontourlineoftheradius,andthelinestyleisathinsolidline.

為了區(qū)分不同形體的表面,仍要畫(huà)出相貫線,這種相貫線稱為過(guò)渡線。過(guò)渡線的畫(huà)法和相貫線相同,只是其端點(diǎn)處不與圓角輪廓線接觸,且線型為細(xì)實(shí)線。2.Filletsincastings鑄造圓角:33.Wallthickness鑄件的壁厚:Toavoidshrinkagecavityandshrinkagecrackcausedbydifferentcoolingspeeds.Duringthedesignphase,itisamusttomaintainuniformwallthicknessorasmooth.Onemustavoidunequaldesignssuchasthicknessabruptvaryingorlocalthickpartialareas.為防止?jié)茶T零件時(shí),由于壁厚不勻而冷卻速度不同產(chǎn)生的縮孔和裂紋,在設(shè)計(jì)鑄件時(shí),應(yīng)使壁厚盡量均勻或逐漸過(guò)渡,以避免壁厚突變或局部肥大的不勻現(xiàn)象。Dedectivness

有缺陷Defectivness

有缺陷請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Smoothtransition

平滑過(guò)渡

Castingstructure鑄件結(jié)構(gòu)Maintainuniformwallthickness壁厚均勻3.Wallthickness鑄件的壁厚:41.Bossclubandrecessedsurface凸臺(tái)與凹坑：

Usually,allsurfacesmountedonotherpartsneedtobemachined.Thebossorrecessedsurfaceisaddedtokeepgoodcontactbetweenthesurfacesoftwopartsandtoreducethemachiningareaandmanufacturingcost.零件上凡與其他零件接觸的表面一般都要加工，為了保證兩零件表面的良好接觸，同時(shí)減少加工面積，以降低制造費(fèi)用，在零件的需接觸表面處常設(shè)計(jì)成凸臺(tái)、凹坑的形式。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容凸臺(tái)凹坑高度不一致,導(dǎo)致加工調(diào)刀工時(shí)費(fèi)、成本高Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)Onemustavoidunequaldesigns

應(yīng)避免凸臺(tái)凹坑高度不一致1.Bossclubandrecessedsurf52.

Chamferandround倒角與圓角:Toeliminateburrsandflashesinordertopreventhumanhandsfromcuttingandtofacilitatemounting,theendsofboththeshaftandtheholeusuallyneedtobechamfered.為了去除零件的毛刺、銳邊，以防止劃傷人手和便于裝配，在軸和孔的端部通常需加工出倒角。Avoidcracks避免斷裂Thatis,thesharpedgeofshaftendiscutbyaconicalcuttingtoolwitha45°degreeapexangle.即用一錐頂角為45°的圓錐刀頭切除其端部銳邊。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)C22×C2Anarctransitionusuallyremainsattheshaftshoulder,whichiscalledround,inordertoavoidcrackscausedbypressureconcentration.在軸肩處，常常制成圓弧過(guò)渡，即圓角，以避免因應(yīng)力集中而產(chǎn)生裂紋。2.Chamferandround倒角與圓角:6Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)Undercut退刀槽Undercut退刀槽Grindingundercut砂輪越程槽Grindingundercut砂輪越程槽Grindingsurface精磨表面Grindingsurface精磨表面3.

Escapeandgrindingundercut螺紋退刀槽和砂輪越程槽:Anescape,grindingortravelinglimitundercutneedstobeproducedattheendofthesurfacetobemachined,inordertoeasilywithdrawthecutterorgrindingwheelwhiletappingorgrindingexternaldiameter.在車削螺紋或磨外圓時(shí),為便于退刀或使用砂輪,需要在待加工面末端先切出退刀槽或砂輪越程槽。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Thedimensionoftheescapeisidentifiedas‘width×depth’or‘width×diameter’.

退刀槽及越程槽的尺寸注成“寬度×深度”或“寬度×直徑”。Commonmachiningstructures機(jī)加7Theaxisofthedrillshouldbeperpendiculartothesurfacetobedrilled,inordertoensurecorrectdrillingpositionandpreventthedrillfrombreakingcausedbyunequalimpactforce.用鉆頭鉆孔時(shí)，為保證鉆孔位置準(zhǔn)確和避免鉆頭因受力不均而折斷，應(yīng)使鉆頭軸線垂直于被鉆孔零件的表面。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Structureofdrillhole鉆孔結(jié)構(gòu)Theintersectionpointwheretheholeandtheobliqueplanemeetisnecessarytosettoplatformandnotchstructure.Iftheanglebetweenthedrillandtheobliqueplaneislargerthan60°,onecandrilltheholedirectly.在與孔軸線傾斜的表面處,常需設(shè)計(jì)出平臺(tái)或凹坑結(jié)構(gòu),但當(dāng)鉆頭與傾斜面的夾角大于60°時(shí),也可以直接鉆孔。Theaxisofthedrillshoul8本小節(jié)結(jié)束謝謝您的認(rèn)真學(xué)習(xí)！退出前一頁(yè)本小節(jié)結(jié)束謝謝您的認(rèn)真學(xué)習(xí)！退出前一頁(yè)9

Castingstructure鑄件結(jié)構(gòu)不與輪廓線接觸在圖片上點(diǎn)擊鼠標(biāo)左鍵“暫?！被蛟俅巍安シ拧盋astingstructure鑄件結(jié)10

Castingstructure鑄件結(jié)構(gòu)在切點(diǎn)附近斷開(kāi)在圖片上點(diǎn)擊鼠標(biāo)左鍵“暫?！被蛟俅巍安シ拧盋astingstructure鑄件結(jié)11

Castingstructure鑄件結(jié)構(gòu)在圖片上點(diǎn)擊鼠標(biāo)左鍵“暫?！被蛟俅巍安シ拧盋astingstructure鑄件結(jié)12

Castingstructure鑄件結(jié)構(gòu)在圖片上點(diǎn)擊鼠標(biāo)左鍵“暫?！被蛟俅巍安シ拧盋astingstructure鑄件結(jié)13Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)Commonmachiningstructures機(jī)加14請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Grindingsurfacebygrindingwheel

砂輪正在精磨工件的表面Commonmachiningstructures機(jī)加工常見(jiàn)結(jié)構(gòu)請(qǐng)Grindingsurfacebygrinding15Structureofdrillhole鉆孔結(jié)構(gòu)

Surfacestructureofthedrillhole鉆孔的表面結(jié)構(gòu)

Representationoftheholeanddimensionofadrill鉆孔的尺寸標(biāo)注Structureofdrillhole16Grindingexternaldiameterbygrindingwheel

砂輪正在精磨斜齒軸的外圓面Grinding