Molds cores

Coring The term coring in IM refers to the addition of steel to the mold for the purpose of eliminating plastic material in that area. Usually, coring is necessary to create a pocket or opening in the product, or simply for the purpose of reducing an overly heavy wall section. For simplicity and economy in injection molds, cores should be parallel to... 

The fabrication of the super alloys of today and those of the future requires improved molds, cores, and binders. Chemical processes and oil refining require catalysts with improved activity, selectivity, and mechanical properties. Classic ceramics and the new ceramics for electronic microcircuits (microelectronics) require purer and more reliable precursors and processes. Chromatographic processes require substrates with improved physical, mechanical, and surface properties. And there is an ever-increasing need of better absorbents, binders, and pigments. 

Pur-Fect Tool . [Ciba-Geigy] Polyurethane casting system used for assembly jigs, backfilling, core boxes, foundry gates and risers, laminating molds, mold cores, pattern plates, prototypes. 

Silbond . [Akzo] Silicates intermediate for binders for inoiganic zinc coatings, investment casting molds, cores, ceramic shapes, coatings. 

To achieve accurate dimensions in the finished part, the mold cores must be aligned accurately with the cavities. Mold halves have large guide pins in the corners to assure alignment. 

Above a certain concentration which decreases with increasing silica-soda ratio as explained above, sodium silicate aqueous solutions become very viscous and are stable for only a limited period of time. Stability in this case means resistance to gelling. More stable solutions can be made at lower sodium silicate concentrations but this may become impractical in a foundry binder. The high water content of very high ratio (more than 4 to 5) sodium silicate solutions at practical viscosities prevent their extended use as a foundry binder in the present invention. Excessively high water content in a foundry binder means unacceptably weak sand molds or cores and detrimental quantities of steam evolving when the molten metal is poured into the sand mold-core assembly. 

Althnu to this long hole is what the design in Fig.. 3A requites, the mold (core) pin would be very long and easily bent. ... 

Chem. Descrip. Resin derived from southern pinewood Uses In adhesives, asphalt emulsions, cement (air-entraining agents), elec, insulation, floor coverings, foundry molds, core washes, inks, paperboard and composition board, phenolic resin modification, plastics, primer and surface coatings, rubber, and shoes for use in food-pkg. and -processing operations... 

Automatic unscrewing mold n. A mold for making threaded products - bottle caps are typical - that incorporates a mechanism for unscrewing the product from the mold core (or vice versa) as the mold opens, thereby releasing the product. Strong AB (2000) Plastics materials and processing. Prentice-Hall, Columbus, OH. 

Latch plate A plate used for retaining a removable mold core of relatively large diameter, or for holding insert-carrying pins on the upper part of a mold. Release of the pins or core is effected by moving the latch plate. 

The mold designs available are draw molds, split molds, cored molds, flexible molds, and plaster molds. 

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