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Case Hardening on a Linear Shaft

27-Feb-2024

What is Case Hardening?

Case hardening is a heat treatment process used to selectively harden the surface of a metal, usually low-carbon steel.  The goal is to create a part with the following qualities:

  • Hard, wear-resistant surface: This outer layer offers superior resistance to scratches, abrasion, denting, and fatigue caused by repetitive stress.
  • Tough, ductile core: The inner core maintains higher ductility and toughness, providing the part with the ability to absorb impacts and resist deformation without breaking.

Benefits of Case Hardening

  • Enhanced Wear Resistance: The hardened surface dramatically improves resistance to abrasion, scratches, and indentation.
  • Improved Fatigue Strength: Case hardening helps prevent cracks from forming and propagating under repetitive stress and loads, extending the part's lifespan.
  • Maintains Core Toughness: Unlike through hardening, the core remains relatively soft, providing shock resistance and preventing catastrophic brittle fractures.
  • Cost-Effective: It's often more cost-efficient to case harden a low-carbon, less expensive steel than to use a high-carbon steel for the entire component.

Machining Considerations

  • Hardened outer surface will increase tool wear on O.D. Turning operations such as parting, grooving, facing.
  • Recommend use of specialised turning inserts (e.g. CBN Tipped inserts)
  • Suitable for griding operations (e.g. Cut-Off wheel, surface grinding flat features)
  • Ductile core allows end drilling & tapping without the need for specialised tooling.
All Kawada Linear Motion Shafts include case hardening, making them the choice for all your Linear Motion & Power Transmission applications
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WHEELER MECTRADE (S) PTE LTD
48, Toh Guan Rd East #03-99, Enterprise Hub, 608586 Singapore.
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Email: wheelermectrade@singnet.com.sg, garry@wheelermectrade.com
Website: https://www.wheelermectrade.com
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