Extrusion

Kub extrusion yog txheej txheem hlau tsim los tsim cov ntoo khaub lig ruaj khov-sectional profile los ntawm kev thawb lub rhuab hlau billet los ntawm kev tuag rau cov duab uas xav tau. Cov txheej txheem kub extrusion yog nqa tawm ntawm qhov kub siab tshaj cov hlau 'recrystallization point, uas feem ntau yog 50-75% ntawm nws melting kub, ua rau nws ntau malleable thiab yooj yim rau deform nrog tsawg zog.

 

Kev piav qhia

 

Kub extrusion muaj peev xwm los tsim complex cross-sections thiab yuav zoo ib yam nyob rau tag nrho ntev ntawm extruded profile, thiab tuag tsim, extrusion piv, billet kub, lubrication, thiab extrusion ceev yuav cuam tshuam rau extrusion zoo. Zoo li lwm yam hlau- txheej txheem tsim, nws raug cais los ntawm qhov kub thiab txias, txias thiab sov extrusion, thiab cov txheej txheem feem ntau yog ua los ntawm qhov kub siab kom txo cov extrusion quab yuam thiab txhim kho cov khoom ductility. Txias extrusion txhais tau hais tias tus nqi qis dua vim txo cov khoom siv raw khoom thiab siab ntau lawm.

 

 

Kub Extrusion vs Txias Extrusion

 

Kub extrusion yuav ua rau lub workpiece saum toj no nws recrystallization kub, thiab cov txheej txheem no yuav txhim kho cov neeg kho tshuab zog ntawm workpiece. Thaum lub sij hawm kub extrusion txheej txheem, qhov kub ua hauj lwm no yuav thawb thiab xa rov qab cov ntaub ntawv, kaw lub vacancy nyob rau hauv lub molten hlau cov ntaub ntawv. Yog li ntawd, cov impurities feem ntau kuj yog tsim nyob rau hauv cov khoom inclusions thiab faib thoob plaws lub loj ntawm lub workpiece. Kev ua haujlwm kub thiab cov hlau extruded yuav tawg cov qauv tsis sib xws thiab recrystallize cov khoom loj rau hauv cov qauv zoo dua wrought grain, thiab yog li cov khoom siv ntawm cov khoom, xws li kev cuam tshuam, ductility thiab lub zog yam ntxwv, zoo dua. Feem ntau cov hlau extrusion yog ua nyob rau hauv billets uas twb tau rhuab ntawm qhov kub thiab txias saum cov hlau 'recrystallization point, uas ua rau nws muaj peev xwm rau ib tug loj npaum li cas ntawm cov duab hloov. Ib qho ntawm qhov tsis zoo ntawm kev ua haujlwm kub kub ntawm cov hlau yog oxidation uas tshwm sim nyob rau saum npoo ntawm cov haujlwm kub, uas ua rau cov txheej txheem ntawm oxide nplai tsim nyob rau sab nraud ntawm cov khoom ua haujlwm. Cov nplai tuaj yeem cuam tshuam qhov chaw tiav thiab qhov tseeb ntawm qhov zoo li ua kom muaj kev sib txhuam thiab hnav ntawm cov hlau tuag. Kub extrusion feem ntau yog xaiv rau qhov loj dua uas yuav tsum tau hloov cov duab loj thiab ntau cov duab geometry.

 

Txias extrusion ntawm cov hlau feem ntau yog siv rau cov khoom me me, cov khoom siv thinner, cov duab tsis tshua muaj, cov ntaub ntawv ua haujlwm ntau dua thiab siv cov khoom sib cais extrusion uas tsim ib feem nrog txhua txoj haujlwm. Txias extrusion muaj cov hauv qab no zoo:

 

• √Cov nqi hluav taws xob qis dua, cov txheej txheem no tsis xav tau cov txheej txheem cua sov.
• √Ntau tus nqi ntau lawm
• √Tsis muaj oxidation thiab nplai, yog li nws tuaj yeem tsim qhov zoo ntawm qhov chaw tiav.
• √Ntau dua geometric raug
• √Cov txiaj ntsig zoo dua rau cov tawv tawv tawv
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Nyob rau hauv luv luv, dav hlau cov ntaub ntawv yog tsim rau kub extrusion xws li tooj liab, txhuas, steel & hlau alloy, stainless hlau, txhuas & tin thiab lwm yam., thiab cov txheej txheem no yog tsim rau loj loj. Txias extrusion yog txheej txheem hlau ua nyob rau hauv los yog ze ntawm chav tsev kub, qhov twg ib tug hlau slug raug yuam los ntawm ib tug tuag los tsim ib tug xav cross-sectional shape. Tsis zoo li kub extrusion, nws yog ua tiav hauv qab cov khoom siv recrystallization kub, thiab cov txheej txheem no tseem hu ua txias forging los yog cuam tshuam extrusion rau kev tsim cov khoom meej nrog zoo heev nto tiav thiab txhim kho cov khoom siv. Txias extrusion yog txheej txheem tseem ceeb heev rau kev siv tsheb, kev tsim kho thiab kev lag luam.

 

 

Extrusion los ntawm Txheej Txheem Mechanics

 

Cov txheej txheem Extrusion tseem tuaj yeem txhais tau los ntawm kev npaj lub cev ntawm tus ram, billet, thiab tuag, thiab hauv qab no yog kev faib tawm poplar:

 

 

• √ Hydrostatic extrusion, nws yog ib tug tshwj xeeb daim ntawv uas lub billet yog kiag li ib puag ncig los ntawm ib tug pressurized kua nyob rau hauv lub thawv. Lub ram pressurizes cov kua dej no, uas nyob rau hauv lem siv txawm siab rau tag nrho cov sab ntawm lub billet, yuam nws los ntawm cov tuag. Qhov kom zoo dua yog tias kev sib txhuam ntawm cov pob zeb thiab lub thawv ntim tau raug tshem tawm tag nrho, thiab kev quab yuam raug txo qis ntxiv.
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• √ Kev cuam tshuam extrusion, feem ntau suav hais tias yog hom txias extrusion, txheej txheem no siv lub siab - nrawm nrawm los ntaus cov hlau slug, ua rau nws ntws plastically mus rau hauv tuag. Cov txheej txheem tuaj yeem ua tau nyob rau hauv pem hauv ntej, rov qab, los yog ua ke, thiab nws tuaj yeem ua tiav ib feem hauv ib qho hlab ntsha ntawm cov xovxwm. Cov txheej txheem hlau no feem ntau yog siv los ua qhov hollow nrog cov phab ntsa nyias.

 

Hauv qab no yog cov ntsiab lus luv luv ntawm cov txheej txheem extrusion sib txawv:

 

Kev sib piv ntawm Extrusion Hom
Feature	Direct (Forward) Extrusion	Indirect (rov qab) Extrusion	Hydrostatic Extrusion	Kev cuam tshuam Extrusion
Cov khoom ntws	Tib txoj kev raws li ram	Rov qab kev taw qhia ntawm ram	Tib txoj kev raws li ram	Pem hauv ntej, rov qab, los yog ua ke
Kev sib txhuam	Kev sib txhuam siab ntawm billet thiab thawv phab ntsa	Tsis muaj kev sib txhuam ntawm billet thiab thawv phab ntsa	Tsis muaj kev sib txhuam ntawm billet thiab thawv phab ntsa; txo tuag kev sib txhuam	Nyob ntawm hom pem hauv ntej / rov qab, tab sis cia siab rau lubrication
Yuav tsum tau muaj zog	Siab tshaj vim kev sib txhuam	Tsawg dua ncaj qha (25-30% tsawg dua)	Tsawg tshaj plaws vim tsis muaj kev sib txhuam thiab cov kua dej siab	Siab cuam tshuam quab yuam nyob rau lub sijhawm luv luv.
Billet Movement	Billet txav txheeb ze rau lub thawv	Billet yog nyob ruaj ruaj txheeb ze rau lub thawv.	Billet txav, thawb los ntawm kua.	Slug nyob ruaj ruaj ua ntej raug ntaus.
Khoom pov tseg	Ib feem me me (lub taub qab) ntawm lub billet tsis tuaj yeem extruded.	Tsawg pov tseg, vim lub pob tw kawg me me los yog tsis muaj.	Tsis muaj cov seem seem seem ntawm cov thawv ntim khoom.	Cov khoom pov tseg tsawg heev (ze -net-puab).
Khoom Zoo	Muaj peev xwm ua rau tsis yog -cov qauv lis piam thiab cov khoom.	Ntau hom qoob loo zoo sib xws thiab cov khoom sib xws.	Zoo heev nto finish thiab uniform zog.	Zoo nto tiav thiab lub zog los ntawm kev ua haujlwm txias.
Siv dav	Khoom tuav, yooj yim hollow duab, structural profiles.	Hollow los yog tubular khoom, siab -lub zog alloy profiles.	Cov ntaub ntawv nkig, cov duab nyuaj, siab - piv extrusion.	Cov kaus poom, cov raj, cov thawv tua hluav taws, cov hlua khi.
nyuaj	Cov cuab yeej yooj yim tshaj plaws thiab txheej txheem.	Cov cuab yeej siv ntau dua (hollow ram).	Feem ntau nyuaj vim muaj siab - kua thiab sealing.	Yuav tsum muaj siab - nias ceev thiab cov cuab yeej muaj zog.