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Nonferrous Metals

Cryogenic treatment is a great way to stress relieve parts before, during and after machining. It is a thorough stress relief process, provided the warm up ramp is very slow and very deliberate. Many try to shorten this phase and only end up reintroducing residual stress back into the parts. If pushed or accomplished too quickly, it will have a tendency to create stress just as too fast a cooling from a heat stress relief process.

This process works well for standard machined metal parts, castings, forging, plastic or composite materials. It is non-destructive to the carbon content of steel and leaves the surface clean and free of oxides, with NO DISCOLORATION, as effected by heat stress relief. It essentially deadens the stress in machined or welded components and makes a world of difference in aluminium parts requiring intricate machining steps.

WHAT CAN YOU EXPECT FROM THE PROCESS?

Stabile stress relieved materials. A real money saver can be gained in the stamping die and mold industry. The dies or molds should be processed after heat treatment but before finish grinding assembly to avoid growth interference or tolerance violation. Then once in production a quick cryogenic re-processing will relieve any long-term build up of compressive stresses, making tools and molds last much longer than conventional tools.

One customer listened after losing two $750,000 multicavity plastic injection molds every 9 to 10 months from cracks radiating from the cooling lines. They were taught how to stress relieve every 3 to 4 months, eliminating the tremendous compressive stress build up. The last mold lasted three years and was still in service until a design change replaced it. That new mold now is being handled the same way. A perfect opportunity for cryogenic stress relief.

Aluminium and non-ferrous metals stress relieved with cryogenics also gain BETTER MACHINEABILITY after processing – a real aid in tight tolerance work. They and plastics get stronger and tougher from the densification of the molecular structure, but the best part is that they are as close to being stress dead as possible.

Some materials that can be cryogenically stress relieved

Aluminum, Brass, Casting, Copper, Dies, Forgings, Machine parts, Iron, Moldings, Plastics, Precision ground parts, Steel, Welded parts

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