twj tso kua mis tsev nyob
Grey hlau yog lub feem ntau ntau yam ntawm tag nrho cov foundry hlau. Lub siab carbon cov ntsiab lus yog lub luag hauj lwm rau yooj yim ntawm kev melting thiab casting nyob rau hauv lub foundry thiab rau yooj yim ntawm kev machining rau hauv tom ntej raug. Qhov tsawg degree los yog tsis tuaj kawm ntawv ntawm shrinkage thiab siab fluidity muab nyiaj pab ntau tshaj txoj kev ywj pheej ntawm tsim rau cov kev ua choj.
Cov kev muaj pes tsawg leeg ntawm grey cam khwb cia hlau yog 95% hlau los ntawm hnyav nrog ib tug ntxiv 2.1 mus rau 4% yog cov pa roj carbon thiab 1 mus rau 3% silicon. Manganese thiab lwm yam impurities kuj kheev pom nyob rau hauv los yog ntxiv rau molten hlau li yuav tsum tau rau cov ploj zuj zus los yog li ntawm tej khoom. Sulfur, piv txwv li, feem ntau qhia mus rau molten hlau nyob rau hauv thiaj li yuav nce hardness, uas yog tsis tshua muaj nyob rau hauv feem ntau cam khwb cia hlau Cheebtsam.
Ntsuab xuab zeb molding is frequently the most economical method of producing castings. Although castings up to 500kgs pounds or more can be made in green sand, it generally is used for medium to small size castings. If green sand molds are not sufficiently hard or strong, some mold wall movement may take place during solidification, and shrinkage defects develop.
Lub plhaub molding txheej txheem kuj yog siv rau kev ua cores, uas yog siv nyob rau hauv lwm yam pwm dua li plhaub molds. Lub hom kom zoo dua yog muaj peev xwm tawv tus pwm los yog cov tub ntxhais nyob rau hauv kev sib cuag nrog ib tug rhuab hlau txawv, kev txhim kho cov neeg thiab finish ntawm lub casting.
Grey hlau casting yog siv nyob rau hauv ntau ua lag luam theem, xws li tsheb, ua liaj ua teb, machinery tsev, electronics, irrigation, cua, architecture, tsim kho thiab kev thauj mus los industries