Cov khoom siv feem ntau yog cam khwb cia hlau: vim muaj lub zog siab thiab zoo toughness, nws yog qhov tsim nyog rau kev ua haujlwm siab; Txawm li cas los xij, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov loj me me, yooj yim los tsim pores thiab shrinkage.
Cov qauv yuav tsum tau hloov mus rau txheej txheem casting:
Uniform phab ntsa tuab kom tsis txhob hloov pauv sai thiab tiv thaiv thermal tawg thiab shrinkage;
Teem lub riser thiab txias hlau kom ua tiav cov khoom sib txuas;
Kev taw qhia ntawm cov pwm yuav tsum tau nqes (feem ntau Tsawg dua lossis sib npaug li 3 degree).
Tej yam tsis xws luag thiab teb
Feem ntau cov tsis xws luag: porosity, shrinkage, looseness, tawg (tshwj xeeb tshaj yog nyob rau hauv lub tam sim ntawd hloov ntawm seem).
Design Countermeasures:
Txo cov pob kub kub thiab ua kom zoo tshaj qhov layout ntawm tav;
Hollow los yog ib nrab thickened qauv yog siv rau tuab qhov chaw;
Lub siab-cov kabmob (xws li qhov chaw mounting ntawm lub tog raj kheej hydraulic) yuav tsum tau ua kom muaj huab cua nruj.
