Cov txheej txheem tsim rau grey hlau castings feem ntau pib nrog melting. Kev tsim khoom pib los ntawm kev faib cov khoom seem hlau, npua hlau, thiab cov khoom tsim rov qab los, uas yog tom qab ntawd yaj hauv lub khob los yog lub cub hluav taws xob kom txog thaum cov hlau molten ncav cuag cov tshuaj muaj pes tsawg leeg thiab tapping kub. Inoculation thiab compositional kho feem ntau yog ua thaum lub sij hawm melting txheej txheem los xyuas kom meej stability ntawm graphite microstructure thiab txhua yam khoom.
Thaum cov hlau molten yog npaj txhij, cov txheej txheem txav mus rau molding thiab pouring. Sand pwm los yog hlau pwm yog npaj raws li ib feem ntawm kos duab; Tom qab cov pwm kab noj hniav raug ntxuav thiab cov pwm halves tau sib sau ua ke, cov hlau molten yog tsis tu ncua rau hauv pwm ntawm qhov tsim nyog kub kom ua tiav cov kab noj hniav. Cov theem no xav tau cov qauv siab rau fluidity thiab pouring ceev kom tsis txhob muaj qhov tsis xws luag xws li txias kaw thiab porosity.
Cov hlau molten cools lawm nyob rau hauv cov pwm thiab solidifies rau hauv cov duab uas xav tau. Thaum lub caij txias, lub flake graphite microstructure maj mam tsim, uas yog qhov tseem ceeb rau cov khoom ntawm grey hlau. Lub sijhawm txias yog txiav txim siab raws li qhov loj me thiab phab ntsa thickness; loj castings yuav tsum tau ncua kev tuav thiab qeeb txias lub sij hawm kom txo tau cov kev ntxhov siab nyob rau hauv thiab kev pheej hmoo ntawm tawg.
Thaum kawg, cov castings raug ntxuav thiab xa tawm - ua tiav. Tom qab demolding, gating systems (sprues thiab risers), flash, thiab adhering xuab zeb raug tshem tawm, ua raws li nto sib tsoo thiab xov. Nyob ntawm daim ntawv thov, cov txheej txheem xws li kev laus kev kho mob lossis machining kuj tseem tuaj yeem ua tau los txhim kho qhov raug thiab qhov zoo ntawm qhov chaw, ua kom cov casting ua tau raws li cov qauv siv zaum kawg.