gate land and gate diameter
The gate land should be as short as possible to achieve lower pressure for filling and to improve de-gating by minimising the height of gate vestige. The only reason for not using very short lands is the loss of strength…
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Gating Design Rules
The gate design should deliver a rapid, uniform and preferably Linidircctional mold-filling pattern,the gate location should allow the air present in the cavity to escape during the injection phase. Failure to vent the air will result in short shots or…
A gate is a small opening
A gate is a small opening (or orifice) through which the poly melt enters the cavity. Gate design for a particular application includes selection of the gate type, dimensions and location. The gate design is largely determined by: The part…
Runner System Design Rules
Runners must be designed to fill the cavity rapidly, routine design must provide for easily ejection and easy removal (de-gating) from the molded part. For multi cavity system, balanced runner layout is practical for the best uniformity and part quality.…
Runner Cross-Section and Layout
The purpose of the runner is to transport the melt from the sprue to the gates. There are three basic parameters for runner geometry: The cross-sectional shape The diameter The cavity layout The most efficient runner section is the full…
Cold Slug Well
Cold Slug Well-This is designed to trap the cooler advancing front of the melt、thus permitting hotter melt to reach the cavities and gates. It usually has a snatch or pull pin or sucker pin underneath it to positively pull the…
Mould Maintenance
All mold tools are expensive and easily prone to damage and corrosion if they are not maintained properly. In most injection molding shops, the mold storage area often houses a considerable capital investment, often running into millions of pounds. Before…
EDM Finishes,Bead Blasting and Vapor Blasting
EDM Finishes Increasing use is being made of EDM techniques to apply finishes to molding surfaces instead of using photochemical] etching. This is a relatively new departure that has come about in an attempt to reduce the time and cost…
Mould Finishing
Mould Finishing-Nearly all cavity and punch forms require a Finish to be applied to them. This may be a Polished finish, a photo-etched finish or a plated finish. However, for some technical Components the surface finish is not important and…
Tuftriding and Nitriding
Nitriding With this procedute the surface hardness() of steel can be increased by the formation of itom nitrides in the surface. The part is heated in a nitrogen-rich environment, usually a gas (ammonia) or a powder bath (the Tenifer process).…