1.Dab tsi yog qhov cuam tshuam ntawm qhov siab elongation tus nqi?
Sib sib zog nqus- qib kos duab (qhov nyuaj): Yuav tsum tau elongation ≥40%, txawm tias siab li 46-52% (xws li DC04/BLD/SPCEN). Cov khoom siv no yog mos thiab muaj cov yas zoo, tso cai rau nws kom sib sib zog nqus -kos rau hauv cov kab noj hniav sib sib zog nqus xws li cov xov tooj ntawm tes thiab cov roj tsheb hauv tsheb.
Nruab nrab- qib kos duab (kev sib sau ua ke): Elongation feem ntau nyob ib ncig ntawm 31-34% (xws li, nruab nrab-kos duab txias-rolled sheet). Haum rau kev kos duab kos duab kos duab kos duab kos duab kos duab zoo li cov vaj tsev hauv lub tshuab cua txias.
Counterexample (ultra- siab zog steel): Thaum lub elongation txo los ntawm ntau tshaj ib tug -thib peb vim cov txheej txheem hloov pauv, stamping yuav ua rau huab hwm coj tawg, ua rau cov khoom siv tsis tau.
2.Dab tsi yog qhov cuam tshuam ntawm qhov qis elongation tus nqi (los yog tus nqi "dub" elongation tus nqi)?
Qhov no yog qhov teeb meem yooj yim tshaj plaws hauv cov txheej txheem stamping. Yog hais tias tus nqi elongation ntawm cov ntawv hlau yog tsim nyog thaum nws tawm hauv lub Hoobkas, tab sis qhov flattening elongation tsis txaus (piv txwv li, txoj kev ncaj ncaj kawg tsis ua tiav), cov ntawv hlau yuav muaj "yield plateau". Thaum lub sij hawm stamping, hom steel ntawv no tsis deform uniformly, tab sis mam li nco dheev plam hauv zos, tsim tensile strain marks (slip kab) - ib feem qhov ntev yog tsim nyog, tab sis nto yog tag nrho ntawm wrinkles, uas yuav tsis tau them tom qab painting, thiab nws yog scrapped ncaj qha.
3.Qhov kev sib raug zoo ntawm elongation thiab hardness yog dab tsi?
Soft materials (Grade A/S): Fully annealed, low hardness (HRB≤65), high elongation (>40%), zoo tshaj plaws stamping kev ua tau zoo.
Hard materials (1/2 hard, fully hard): High hardness (HRB>74), tsis tshua muaj elongation, yuav luag tsis muaj plasticity; yuam stamping yuav inevitably ua rau tawg.
Xaus: Yog tias hardness tshaj tus qauv thaum lub sij hawm txais, elongation kuj yuav substandard, ua rau nws tsis haum rau stamping.
4.Dab tsi yog qee qhov nyuaj rau kev xaiv cov khoom siv rau stamping?
Txheeb xyuas qhov elongation qhov tseem ceeb: Cov khoom tsis sib xws yuav tsum muaj qhov elongation ntawm A80 ≥ 40% raws li tau teev nyob rau hauv daim ntawv pov thawj zoo; Qhov zoo tib yam yuav tsum muaj tsawg kawg yog ≥ 32%.
Txheeb xyuas qhov chaw tiav: Thaum cov qauv stamping, xyuas cov kab hauv qab. Lub xub ntiag ntawm daim kab xev qhia tias tsis txaus flatness; Txawm hais tias qhov chaw tiav yog qhov txaus, cov khoom yuav tsum tau rov qab.
Txheeb xyuas cov qib sib xws: Xaiv cov ntaub ntawv ncaj qha nrog cov qib xaus hauv "D" (xws li DC04, DC06, SPCD, BLD). Cov no yog siab -elongation series cov ntaub ntawv tshwj xeeb tsim los rau stamping.
5.Yuav ua li cas elongation cuam tshuam rau stamping?
Qhov siab dua qhov elongation, qhov muaj zog ntawm cov khoom siv yas deformation muaj peev xwm, thiab qhov zoo dua nws tuaj yeem tiv taus txoj kev ncab thiab bulging yam tsis muaj tawg; Tsis txaus elongation yuav inevitably ua rau tawg los yog nto defects thaum stamping.