Technology for fusing moulds

US hot runner supplier Polyshot has introduced a vacuum brazing technology for fusing of multi-component mould cores and cavity assemblies for conformal cooling systems, which reduce cooling time and achieve overall cycle time reductions of up to 60%. The firm says that the expansion of its fusion technology to conformal cooling has resulted in strong growth with more than half the business coming from overseas customers.

Polyshot’s fusion technology fuses together two or more steel plates to create internal flow paths, allowing the creation of internal full round flow paths that allow generous sweeping curves and no hold-up areas. These internal flow paths withstand very high injection pressures and external forces while still maintaining the integrity of the brazed joint. For conformal cooling systems, Polyshot’s vacuum brazing technology is a proprietary process that makes use of a high-temperature vacuum furnace. Rough cores and cavities with machined conformal cooling paths are fused together by Polyshot in a stack which is typically one to six layers. Typical materials that are fused include H-13, 420 stainless steel and S-7. Cores are shipped back to the customer in a soft state, approximately 30 RC, and require additional post brazing hardening at a local heat treat facility. The typical turnaround time for the process is up to two weeks.

The vacuum brazing process is targeted for high-cavity moulds (32-128 cavities) for high-volume packaging applications such as caps and closures.


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