注塑模具venting(文件)
【正文】 in moulding will crush it otherwise ? insert must be sparked on both sides, machining it will close the gaps between the particles ? needs to be low cost and easily replaceable, it will get blocked Efficient Venting Page 8 Priority venting, guiding principles: ? vent land must be as short as possible ? vent land must be as wide as possible ? split line venting must cover at least the last 1/2 of fill, more is better ? relief channels must exit to atmosphere without restriction ? moving cores/ejector pins must be vented ? fixed cores/inserts should also be vented ? known gas trap areas need extra venting. Additional ejector pins solely there for venting should be considered Efficient Venting Page 9 Typical split line relief channel positions: gate Continue to atmosphere Vent land length 2mm for hardened steel 5mm everything else . for endgated oblong Efficient Venting Page 10 Typical split line relief channel positions: . for centre gated disc Continue to atmosphere, 2 or more places Vent land length 2mm for hardened steel 5mm everything else Efficient Venting Page 11 Typical split line relief channel positions: . for oblong with cutouts gate Continue to atmosphere Vent land length 2mm for hardened steel 5mm everything else Continue to atmosphere . drill back to ejector box Efficient Venting Page 12 Typical relief channel positioning Efficient Venting Page 13 Typical relief channel positioning Efficient Venting Page 14 Typical split line vent crosssection: Vent land length 2mm for hardened steel 5mm everything else core Split line Relief channel depth, cavity Relief channel shape and width dependant on total shutoff land available. Must taper up towards split line to maintain steel strength and not be d
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1