1.Dab tsi yog qhov elongation ntawm txias-rolled coils? Nws cuam tshuam li cas rau stamping?
Yield elongation yog hais txog qhov tshwm sim uas, thaum lub sij hawm sim tensile, txias -rolled steel ntawv txuas ntxiv mus rau cov yas deformation tom qab qhov kev ntxhov siab nce mus txog qhov taw tes tawm, yam tsis muaj qhov tseem ceeb hauv kev quab yuam sab nraud. Qhov no yog sawv cev raws li "yield plateau" ntawm kev ntxhov siab -strain nkhaus.
Qhov tshwm sim no muaj kev cuam tshuam ncaj qha rau stamping vim:
Nws yog lub hauv paus ua rau tsis sib xws deformation: Yield elongation sib raug rau cov yas deformation tsis sib xws hauv cov khoom. Thaum pib stamping, cov ntaub ntawv nrog cov yield elongation yuav dheev deform nyob rau hauv cov cheeb tsam hauv zos es tsis txhob txuas ntxiv uniformly thoob plaws tag nrho ib feem.
Nws yog ib qho ua rau muaj qhov tsis xws luag: Qhov kev tsis sib xws tam sim no ua rau cov qauv sib txuam ntawm qhov chaw stamped, piv txwv li, Lüders bands lossis tensile strain marks, ua rau qhov zoo ntawm qhov chaw.
2.Yuav ua li cas yield elongation tsim "stretch marks" nyob rau saum npoo ntawm ib feem stamped?
Microscopic Mechanism: Nyob rau hauv txias- dov coils, interstitial carbon thiab nitrogen atoms sib sau ua ke nyob ib ncig ntawm dislocations, tsim "Coothill huab" uas ruaj khov rau dislocations. Yuav tsum muaj kev ntxhov siab ntau dua thaum lub sij hawm stamping kom tsis txhob muaj kev cuam tshuam.
Sudden Yielding: Thaum muaj kev ntxhov siab txaus txaus, ntau tus pinned dislocations tawg yuav luag ib txhij, ua rau cov yas deformation tam sim ntawd.
Macroscopic Manifestations: Qhov deformation tam sim no tsis tshwm sim zoo ib yam, tab sis cov ntaub ntawv banded slip zones ntawm lub kaum sab xis mus rau tensile kev taw qhia ntawm cov khoom nto, hu ua Lüders bands. Cov cheeb tsam banded no muaj cov khoom kho qhov muag sib txawv dua li cov cheeb tsam tsis zoo, tshwm rau ntawm qhov muag liab qab raws li cov qauv lossis wrinkles.
Cov txiaj ntsig: Stamped qhov chaw nrog qhov tsis xws luag, tshwj xeeb tshaj yog cov npog sab nrauv (xws li lub qhov rooj tsheb thiab lub hood), yuav tsum tau muab pov tseg lossis txo qis vim qhov tsis xws luag tseem pom tom qab pleev xim.
3.Besides ua rau nto stretch marks, puas yield elongation tseem cuam tshuam lwm yam khoom ntawm stamped qhov chaw?
Tsawg qhov tseeb qhov tseeb: Vim qhov tsis sib xws ntawm deformation, lub springback ntawm stamped qhov chaw yog qhov nyuaj rau kwv yees thiab tswj, uas ua rau tsis zoo seem stability thiab cuam tshuam rau tom ntej vuam thiab sib dhos raug.
Kev pheej hmoo hauv zos thinning: Lüders bands feem ntau yog thaj chaw ntawm kev sib txuam deformation, uas tuaj yeem ua rau cov khoom siv ntau dhau hauv cov cheeb tsam no, dhau los ua qhov muaj peev xwm ntawm cov kab nrib pleb.
Cov khoom siv tsis sib xws: Lub xub ntiag ntawm cov khoom elongation txhais tau hais tias cov khoom siv tsis sib xws nyob rau hauv cov theem thaum ntxov ntawm stamping, uas ua rau sib txawv qib ntawm kev ua hauj lwm hardening nyob rau hauv ntau qhov chaw ntawm lub tiav lawm ib feem, thaum kawg ua rau qhov sib txawv ntawm txhua yam khoom.
Nce tuag hnav: Tsis sib xws deformation ua rau muaj kev ntxhov siab hauv cheeb tsam ntawm cov neeg tuag, ua kom lub cev tuag thiab txo lub neej tuag.
4.Vim li cas qee qhov txias- dov coils nthuav tawm elongation thaum lwm tus tsis? Qhov no yuav tswj tau li cas ntawm qhov chaw?
Ncej -annealing leveling (quenching thiab tempering): Qhov no yog txoj kev tswj ncaj qha tshaj plaws. Txias-rolled coils yuav tsum tau mus rau theem txheej txheem tom qab annealing. Los ntawm kev siv qhov txo me me ntawm 0.8% mus rau 1.5%, dislocations yog ua ntej-unpinned, tshem tawm cov qoob loo. Yog hais tias lub leveling elongation tsis txaus, los yog tsis txhob weld seams tshwm sim nyob rau hauv lub zos unevenness, cov cheeb tsam no yuav khaws yield elongation.
Kev tswj hwm kev sib xyaw (qhov chaw tswj): Interstitial atoms (C, N) hauv cov hlau yog lub hauv paus ua rau Cotillard cua tsim. Los ntawm kev ntxiv cov ntsiab lus microalloying xws li titanium thiab niobium, uas ua ke nrog C thiab N los tsim cov carbonitrides ruaj khov, tus naj npawb ntawm cov tshuaj atoms tuaj yeem txo qis, txo qis cov txiaj ntsig elongation. Ultra- cov pa roj carbon tsawg (IF steel) ua tiav nws lub hnub nyoog - dawb huv los ntawm txoj cai no.
Annealing txheej txheem kev sib koom ua ke: Kev tswj cov cua txias tom qab annealing kuj cuam tshuam rau carbide nag lossis daus tus cwj pwm, yog li cuam tshuam rau elongation yield.
5.Koj yuav ua li cas yog tias koj ntsib cov khaub thuas - dov coils nrog yield elongation raws li ib tug neeg siv stamping?
Kev Tshawb Nrhiav Ceev thiab Kev Pom Zoo: Yog tias tsis ntseeg, coj cov qauv los ntawm ob qho kawg ntawm cov hlau kauj rau kev kuaj tensile thiab soj ntsuam qhov kev ntxhov siab -strain nkhaus rau qhov pom tau tias muaj txiaj ntsig zoo. Qhov no yog txoj kev ncaj ncees tshaj plaws ntawm kev txiav txim.
Kev Kho Cov Txheej Txheem (Kev ntsuas ib ntus):
Ua ntej-Kev kho deformation: Ua ntej kev stamping, siv lub tensile me me los yog dabtsi yog khoov deformation rau cov ntawv hlau (xws li, hla nws los ntawm lub tshuab leveling) kom ua tiav cov nyhuv flattening zoo sib xws thiab tshem tawm cov qoob loo.
Kho Stamping Ceev: Hauv qee qhov tsis tshua muaj, hloov qhov nrawm nrawm lossis lub zog tuav lub zog tuaj yeem txo qhov tsos ntawm Lüders bands, tab sis feem ntau nws nyuaj rau tshem tawm tag nrho.
Tracing Raw Khoom Qhov Chaw: Tawm elongation tsis xws luag feem ntau mloog zoo ntawm lub taub hau thiab tus Tsov tus tw ntawm steel kauj (nyob rau hauv kwv yees li 20-50 meters) vim hais tias tus flattening elongation tus nqi yuav tsis ua raws li cov qauv thaum lub sij hawm steel zeb theem kom tsis txhob weld seams. Sim tshem tawm ntau lub taub hau thiab tus Tsov tus tw thiab siv qhov nruab nrab los tsim qhov tseem ceeb.
Kev sib koom tes nrog cov neeg muab khoom:
Khaws cov ntawv pov thawj kev pov hwm zoo thiab cov qauv ntawm cov teeb meem batch thiab tsa qhov kev tsis pom zoo nrog tus neeg muag khoom.
Muab cov lus tawm tswv yim ntawm qhov chaw tshwj xeeb ntawm qhov tsis xws luag (piv txwv li, daim ntawv twg thaum pib ntawm lub yob) los pab lub zeb zeb taug qab nws cov txheej txheem txheej txheem cov ntaub ntawv thiab nrhiav cov hauv paus ntsiab lus ntawm qhov teeb meem.