Category plastic mold

standard parts in mold tools

While the use of standard parts in mold tools has many advantages, it can take a long time to incorporate them in to mold tool designs as a. great deal of information has to be looked up in the catalogues.…

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…

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).…

Pretoughening and Carburising or Case Hardening

Pretoughening The process of through-hardening steels and then finish machining them is time consuming and expensive; to avoid this, prehardened or pretoughened steels have been developed,the effect the steel is heat-treated in a similar way to normal through-hardened steels but…

Heat treating

Heat treating is a science in itself and should be left to specialists. One of the reasons the designer should stay with a minimum selection of tool steels is to avoid the many heat treatment specifications, which are usually different…