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Cryogenic Treatment
The term, “Cryogenics”, refers to temperatures below (-280 deg. F.). The objective of Cryogenic Treatment is to produce considerably longer wear life for any tool or dynamic part subject to wear and abrasion. The material is cooled slowly, held for a prolonged period of time, 20-60 hours, and allowed to return to room temperature slowly. This process perfectly aligns the molecules of the material treated, making it tougher and extremely wear resistant.

The treated material maintains it’s original size and shape throughout the cryogenic process. Following treatment, the treated material becomes less brittle without losing hardness. What does change most significantly and considerably is an increase in the material’s toughness, stability and resistance to wear. Unlike other types of surface treatments, Cryogenic Treatment will not wear off. The material is treated through and through. This is particularly effective for cutting tools where periodic sharpening is required.

 

Every major industry has used Cryogenic Treatment for steel tools, cutter blades, dies, drills, taps, reamers, cutting tools, springs, wheels, shafts, bearings, gears, and valve components. Here at CTMI, we Cryogenic Treat the bearings, shafts and gears in all gearbox rebuilds. That means less maintenance, less down time and reduced cost for our customers. Please contact us for a complete brochure on Cryogenic Treatment.

Shot Peening
Shot peening is a process used to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass or ceramic particles) with force sufficient to create plastic deformation. It is similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion: each particle functions as a ball-peen hammer. In practice, this means that less material is removed by the process, and less dust created.

Peening a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Depending on the part geometry, part material, shot material, shot quality, shot intensity, shot coverage, shot peening can increase fatigue life from 0%-1000%.

Plastic deformation induces a residual compressive stress in a peened surface, along with tensile stress in the interior. Surface compressive stresses confer resistance to metal fatigue and to some forms of corrosion. The tensile stresses deep in the part are not as problematic as tensile stresses on the surface because cracks are less likely to start in the interior. In gear applications, Shot Peening toughens the surface layer of the gear as well as allowing more oil to adhere to the surface of the gear tooth for increased lubrication. Here at CTMI, we Shot Peen the gears in all gearbox rebuilds. That means less maintenance, less down time and reduced cost for our customers. Please contact us for a complete brochure on Shot Peening.