1.Yuav ua li cas elongation tshwj xeeb cuam tshuam rau stamping thiab ncab?
Kev sib sib zog nqus sib sib zog nqus- kos qhov chaw (xws li tsheb lub cev vaj huam sib luag thiab cov roj tso tsheb hlau luam): yuav tsum muaj qhov elongation siab heev. Cov khoom yog stretched thiab thinned dramatically nyob rau hauv tuag. Tsis txaus elongation yuav ua rau cov khoom tawg ncaj qha ntawm cov ntsiab lus ntawm qhov siab tshaj plaws deformation, xws li cov ces kaum thiab bulges.
General stamped qhov chaw: elongation txiav txim siab txoj kev txwv. Cov txheej txheem engineers yuav tsum xam qhov "limiting drawing ratio" raws li cov ntaub ntawv elongation thaum tsim tuag thiab tsim cov txheej txheem; tshaj qhov txwv no yuav ua rau seem.
2.Yuav ua li cas elongation tshwj xeeb cuam tshuam rau khoov thiab curling?
Thaum khoov, txheej txheej ntawm cov khoom yog nyob rau hauv nruj, thaum lub puab txheej nyob rau hauv compression. Cov ntaub ntawv uas tsis tshua muaj elongation yog nquag mus rau microcracks ntawm sab ntug ntawm qhov khoov, thiab tej zaum yuav txawm tawg ncaj qha ntawm lub ces kaum.
Cov ntaub ntawv nrog cov elongation zoo tuaj yeem tiv taus me me dabtsi yog khoov radii (lub vojvoog me me), thiab nthuav tawm qhov ruaj khov dua tom qab khoov, ua rau nws yooj yim los tswj qhov raug qhov tseeb.
3.Yuav ua li cas elongation tshwj xeeb cuam tshuam rau yob txoj kev?
Thaum tsim ib qho kev tiv thaiv tsis tu ncua -nplua tus qauv los ntawm chais, cov ntaub ntawv undergoes localized stretching thiab compression. Txaus elongation ua kom pom tseeb qauv tsim thiab tag nrho cov npoo, tiv thaiv cov kab nrib pleb los ntawm kev sib sau ntawm cov npoo los yog cov hauv paus hniav ntawm cov qauv.
4.Dab tsi yog qee qhov kev ua haujlwm tsis zoo tshwm sim los ntawm qhov tsis txaus elongation?
Cracking/Fracturing: Qhov tshwm sim ncaj qha thiab loj tshaj.
Txiv kab ntxwv Peel Phenomenon: Ib qho ntxhib, tsis sib xws saum npoo zoo li txiv kab ntxwv tev tshwm rau ntawm thaj chaw deformed. Qhov no yog tshwm sim los ntawm cov khoom tsis txaus plasticity thiab uncoordinated deformation ntawm sab hauv nplej.
Moulding tsis sib xws: Cov yas tsis zoo thaum lub sij hawm deformation ua rau ntau dhau thinning hauv qee qhov chaw thaum lwm qhov chaw nyob hauv qab - deformed.
Nce Springback: elongation feem ntau muaj kev sib raug zoo nrog cov khoom ua haujlwm hardening Performance index (n-tus nqi). Cov ntaub ntawv uas tsis tshua muaj elongation feem ntau muaj cov nqi qis n-, uas ua rau lub caij nplooj ntoos hlav ntau dua tom qab molding thiab ua rau nws nyuaj rau kev tswj qhov tseeb ntawm qhov chaw.
5.Qhov kev sib raug zoo ntawm elongation thiab lwm yam kev ntsuas kev ua tau zoo yog dab tsi?
Siab -lub zog qis- alloy steel: siab zog (piv txwv li, tensile lub zog) ua tiav los ntawm kev sib ntxiv ntawm cov ntsiab lus alloying lossis cov txheej txheem tshwj xeeb, tab sis nws qhov elongation feem ntau yog txo qis.
Ordinary low- carbon steel (xws li SPCC/SPCD/SPCE, Q235 series): Lub zog nruab nrab, tab sis zoo heev elongation, tshwj xeeb tshaj yog haum rau txoj kev sib sau.
SPCC: Kev siv dav dav, nrog kev siv tau elongation.
SPCD: Rau stamping, nrog ntau dua elongation.
SPCE: Rau kev sib sib zog nqus nqus, nrog qhov siab tshaj plaws elongation thiab zoo tshaj plaws plasticity.