1.Dab tsi yog cov mechanisms thiab phenomena ntawm yield zog fluctuation?
Mechanism: Qhov siab dua qhov tawm los ntawm cov khoom siv, qhov ntau dua lub springback tom qab tsim. Yog hais tias cov khoom ntawm lub taub hau, nruab nrab, thiab tus Tsov tus tw ntawm tib batch ntawm txias -rolled coils yog inconsistent, los yog yog hais tias lub yield zog ntawm txawv batch ntawm cov khoom tuaj deviates ho (xws li, ± 30MPa los yog ntau tshaj), tus nqi ntawm springback yuav txawv considerably.
Phenomenon: Unpredictable hloov nyob rau hauv lub flange lub kaum sab xis thiab sidewall deflection.
2.Dab tsi yog cov txheej txheem thiab cov txiaj ntsig ntawm kev hloov pauv hauv kev ua haujlwm hardening Performance index (n tus nqi) thiab cov yas strain piv (r tus nqi)?
Mechanism: Tus n- tus nqi txiav txim siab tus nqi hardening thiab strain tis muaj peev xwm ntawm cov khoom nyob rau hauv nro; lub r-tus nqi (thickness anisotropy coefficient) txiav txim siab thinning kuj ntawm cov khoom nyob rau hauv cov thickness kev taw qhia.
Qhov tshwm sim: Kev hloov pauv ntawm ob qhov tsis sib xws tuaj yeem ua rau qhov tsis sib haum xeeb ntawm qhov chaw nyob rau hauv tib qhov kev tuag tshem tawm, yog li cuam tshuam rau qhov tawv nqaij (dent resistance) thiab qhov ntev kawg tom qab tsim.
3.Dab tsi yog cov txheej txheem thiab qhov tshwm sim ntawm phaj thickness kam rau ua (thickness fluctuation)?
Mechanism: Rau kev nplua blanking lossis kos duab zoo tib yam, qhov kev tshem tawm tuag yog tsau. Thaum cov khoom tuaj yog nyias nyias (tsis zoo siab), qhov haum ntawm cov khoom thiab cov khoom tuag deteriorates, yooj yim ua rau warping; Thaum cov khoom tuaj yog tuab heev (zoo kam rau ua), lub extrusion siab nce, tuag hnav intensifies, thiab kub nce, ua rau thermal expansion thiab ntxiv hloov qhov clearance.
Phenomenon: Qhov tob ntawm qhov blanking marks ntawm cov khoom sib txawv, los yog cov khoom ua daig ntawm qhov tuag, ua rau deformation.
4.Dab tsi yog qhov cuam tshuam ntawm kev hloov pwm kub?
Lub ntsiab lus tseem ceeb: Thaum lub sij hawm tas mus li, pwm kub yuav nce los ntawm chav tsev kub (kwv yees li 20 degree) mus rau thermal equilibrium (muaj peev xwm ncav cuag 50-80℃lossis siab dua).
Qhov tshwm sim: Cov punch thiab tuag nthuav dav vim cua sov, txo qhov kev tshem tawm thiab ua kom muaj kev sib txhuam. Yog tsis muaj kev ntsuas kub (xws li pwm kub tswj), yuav muaj qhov sib txawv ntawm qhov sib txawv ntawm thawj feem uas tsim thaum sawv ntxov (txias pwm) thiab qhov ua rau yav tav su (kub pwm) (feem ntau, springback yog tsawg dua hauv lub xeev kub pwm).
5.Dab tsi yog qhov tshwm sim ntawm pwm hnav thiab khawb?
Thaum lub vojvoog (R) ntawm cov pwm hnav hnyav heev, lossis thaum hnav ntawm txoj siv sia ua haujlwm ua rau muaj kev tshem tawm ntau ntxiv, qhov kev txwv quab yuam ntawm cov khoom tsis muaj zog, tus nqi ntws nce, thiab qhov loj me me zuj zus los yog lub caij nplooj ntoos hlav nce ntxiv.
Yog hais tias cov pwm saum npoo tsim roughening (cov ntaub ntawv nplaum), qhov kev sib txhuam hauv zos nce ntau, ua rau cov khoom nyob rau hauv qhov chaw yuav "kab", uas ua rau txawv txav hauv zos deformation.