METHOD FOR FORMING LOST FOAM PATTERN FOR CASTING

PURPOSE:To precisely form a lost foam pattern having thin part by opening air vents in order from the air vent corresponding to space for forming the thin part to the air vent corresponding to space for forming main body part. CONSTITUTION:Beads for lost foam pattern are packed while exhausting the air from the metallic mold 10 through plural fid ieett a8n1s s e8 9qii mhn,eia lrcem lo p0ote to mot eolbsy no mhp tleona1l. Toeq,et eibeaise2 oe oodtcfnar lastsre r oatkodsitte ehg np co qoe formrnd chi nasn bsdt artv1n ne ihl 'p cr von ohmens fho hanipgr n5tie aho eecanltctmtlo,0atc normltmealssC formepgtne no1q eaii gothetmeie forytpard s4cand toettoi yattm1.,FBrih rs dhe air vents 28-1-28-9 are opened in order from the air vents 28-1, 28-2 corresponding to the space 20 for forming the thin part and the air vents 28-8, 28-9 corresponding to the space 16 for forming the main body part. By this method, the beads for lost foam pattern can be forcedly packed into the space for forming the thin part.