Cov nyhuv ntawm Pouring Kub ntawm Casting

Tsawg casting kub yuav ua rau muaj qhov tsis xws luag

(1) Tom qab cov kua slag suav nrog kev kho mob, ib qhov me me yuav tshwm rau ntawm qhov chaw grey cam khwb cia hlau castings. Txoj kab uas hla ntawm lub qhov feem ntau yog 1 ~ 3mm. Qee zaum, tsuas muaj 1-2 qhov me me. Metallographic txoj kev tshawb fawb pom tau tias cov pores tau tshwm sim ua ke nrog me me ntawm cov kua slag, tab sis tsis muaj leej faj cais tawm. Kev tshawb fawb qhia tau hais tias qhov tsis xws luag yog cuam tshuam nrog qhov kub thiab txias. Thaum lub pouring kub siab tshaj 1380 degree, tsis muaj xws li tsis xws luag nyob rau hauv lub casting, yog li lub pouring kub yuav tsum tau tswj ntawm 1380-1420 degree . Nws yog tsim nyog hais tias tus tsim ntawm lub rooj vag system tsis tau hloov pauv kom tshem tawm qhov tsis xws luag. Yog li ntawd, qhov teeb meem no tuaj yeem raug ntaus nqi rau qhov qis qis thiab qhov tsim ntawm cov hlau molten thaum pouring nyob rau hauv ib tug micro txo ​​cua.

(2) Manganese sulfide porosity hom porosity no nyob hauv qab ntawm qhov chaw ntawm grey cam khwb cia hlau, feem ntau saum npoo av, thiab feem ntau raug tom qab ua tiav. Lub pore txoj kab uas hla yog li 2 ~ 6 hli, thiab qee zaum muaj me me ntawm slag nyob rau hauv lub pore. Kev tshawb fawb metallographic qhia tau hais tias qhov tsis xws luag no yog vim qhov ntsuas kub qis thiab cov ntsiab lus siab ntawm manganese thiab sulfur hauv cov hlau molten, uas ua rau manganese cais thiab sib xyaw slag.

Cov ntsiab lus ntawm cov sulfur no thiab cov ntsiab lus manganese tsim nyog ({{0}}}.5 feem pua ​​~ 0.65 feem pua ​​) tuaj yeem txhim kho cov purity ntawm cov hlau molten, yog li tiv thaiv tau qhov tsis xws luag.

(3) Cov porosity thiab porosity tshwm sim los ntawm cov xuab zeb core gas feem ntau tshwm sim los ntawm kev tsis zoo ntawm cov xuab zeb core. Vim hais tias cov xuab zeb core yog hardened nyob rau hauv lub tub ntxhais lub thawv thaum lub sij hawm ua cov txheej txheem, cov huab cua qhov nyob rau hauv cov xuab zeb core feem ntau yog tsis txaus. Txhawm rau tsim cov qhov cua, qhov drilling ntxiv tuaj yeem ua tom qab cov tub ntxhais tau hardened.