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Manufacturing Technology Insights | Tuesday, July 30, 2024
Cryogenic hardening is especially useful for workpieces machining into delicate, asymmetrical, or irregularly shaped components since its goal is stability.
Fremont, CA: Heat-treated steels are the most typical material to cryogenically treat, although other metals such as iron and aluminum can also be treated this way. Cryogenic hardening is especially useful for workpieces machining into delicate, asymmetrical, or irregularly shaped components since its goal is stability. Cut-to-length billets are transferred to cryogenics before being placed in the machines to prevent any stress-related problems during machining.
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Although cryogenic hardening is not widely available in precision machine shops, it is a treatment that will gain popularity as more manufacturers and consumers see its benefits for both the shop and the end product. Here are some benefits those cryogenic hardening offers for precision machined parts:
Stability
Maintaining material stability is crucial when creating components with exact tolerances. However, precision machining and heat treatment jeopardize this stability by putting stresses on the metal that could destabilize it. "Stressed out" metals are more likely to warp, bow, bend, and twist when being machined—problems that most definitely don't live up to the high caliber standards of our facility.
Cryogenic hardening reduces material stress and facilitates quick, efficient machining by stabilizing the metal and deadening molecular energy.
Cryogenic hardening is especially useful for items made of stainless steel from the 400 series intended for medical applications. The material is complex to process, and the pieces frequently have acceptable tolerances and intricate features. Cryogenic hardening allows us to machine these expensive medical parts with great straightness and positional tolerances.
Durability
The atoms of a metal reorganize during cryogenic freezing, reducing the amount of the material's soft, malleable austenite. The metal's martensite content rises concurrently, fortifying the grain structure and boosting hardness and durability.
Wear Resistance
Metal materials that have been cryogenically hardened are better able to withstand wear and corrosion. The metal components' lifespan is further increased by the freezing process, which causes fine eta-carbides to bond and maintain the martensite matrix of the metal.
Cost Savings
There is a perception that cryogenic hardening is expensive. However, the considerable machining time required to "fight" an unstable material to produce tight-tolerance components is far more costly than cryogenics.
Stable metal may be challenging to the mill for small, intricate pieces; the machinist must work slowly to guarantee precision and high quality. Metal that has been cryogenically hardened may be machined three to four times more quickly, resulting in reduced machining expenses and superior quality.
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