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RT257 - Depending on design it may be a little ditficult...

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Unformatted text preview: Depending on design, it may be a little ditficult to get the proper bends behind the core. Extra turns as far down into the well as possible are recom— mended. Regardless of depth, consider all of the X—Y area of the mold itself as the primary cooling surface. When you have the best shapes you can get, clamp the tubing ends against the plate where the slots are cut and mix the backfill compound with the aluminum granulate (without the hardener). The best formulation is Ciba Specialty Chemi- cals RP 4036R/RP 15111-1 combined with 30% by volume RP 38 Aluminum Granulate. It’s high viscosity, good thermal transfer qualities and superior strength make it an excellent choice. When both A and B lanes are complete, you may treat them as you wou d any molds—that is, with care. Make a law extra turns it you can't reach the bottom ol the core well TIP Make a putty dam to contain excess material around the edges of the retainer plate (ex- cess to be machined off in final preparation). ® Mix RP 4036R/RP1511H at the manu- facturers’ recommended ratio of 100213 parts by weight. To this mixture, add 30% by volume (20% by weight) of RP 38 Aluminum Granulate and begin filling and packing. Be careful here - ACES molds can be damaged by expansion. Pack the mixture firmly into the mold, pushing the material towards the backside of the mold cavity. TIP If using heat to cure, don’t heat the material too quickly or expansion may cause bowing of the insert. , @ When the curing is complete, machine off the backside of the backfill to plate thickness. (7) Now is the time to create your ejector pins. Follow standard procedures for machining and uniting the pins. ...
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