注塑模具venting-展示頁(yè)
2024-08-16 16:51本頁(yè)面
【正文】 it 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 deformed Vent land, for nylon remove during tool build Efficient Venting Page 15 Taken closer in critical areas: Split line In critical areas, blend the relief channel closer to the cavity shutoff edge Can be as close as for hardened inserts, but must be machined very carefully to avoid breaking through to the cavity Efficient Venting Page 16 Taken closer to shutoff in critical area Efficient Venting Page 17 Ejector pin venting: ? Ejector pins include sleeve ejectors ? Working clearance already exists with all ejector pins ? Diameters are much easier to control to very close tolerances than other shapes ? Ejector pins are low cost parts of the tool ? They are easily replaceable ? The same venting principles apply, full width relief channel as close as possible to the shutoff with no restriction on exit to atmosphere (normally to the ejector box) ? Vent all ejector pins, not just those covered by the last flow Efficient Venting Page 18 Ejector pin venting: Full circle relief channel under end of ejector pin. As short as possible, 1mm preferred 30186。 these data may not be
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