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12 Induction

Induction hardening is an electromagnetic process used to heat and quench cylindrical components, achieving localized hardening with minimal distortion. It offers advantages such as the ability to target specific areas, economical processing for larger parts, and fast turnaround times, typically around 2 days. Common materials processed include various steel grades, and the method is adaptable for different component sizes and configurations.

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20 views1 page

12 Induction

Induction hardening is an electromagnetic process used to heat and quench cylindrical components, achieving localized hardening with minimal distortion. It offers advantages such as the ability to target specific areas, economical processing for larger parts, and fast turnaround times, typically around 2 days. Common materials processed include various steel grades, and the method is adaptable for different component sizes and configurations.

Uploaded by

Sunil Saini
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Induction Hardening HTL Fact Sheet 12

Induction hardening is a process where the heat energy is induced into the part electromagnetically by passing high
frequency AC current through a coil that is in close proximity to the work. The heated area is then quickly quenched using a
water based spray quenchant. Because the heating and quenching is very rapid and localised, this minimises the exposure
of the surface to air so generally a protective atmosphere is not needed. The depth that the heating or hardening penetrates
into the part is related to the frequency of the AC current used, which can be varied.
Most commonly at Heat Treatments we induction harden the surface of cylindrical components, pins, shafts, axles and the
like but there are many other configurations possible, especially when quantities justify the construction of a specialised
coil. We have successfully induction hardened sprockets, drive dogs, ratchet pawls, cam lobes, splines etc.

Advantanges of Induction Hardening


• Ability to localise hardening to specific areas.
• Less distortion than alternatives such as carburising.
• Heavy case depths achievable, 1-10mm common.
• Cheap/economical especially with parts of mass >10Kg.
• Fast process - quick turnaround.

CNC Twin Spindle Induction Hardener

Commonly Processed Materials


1045 - 1060, 4140, 4340, P20, 2767 Component - spinning

Maximum Sizes Heating coil carrying HF current

Raydyne Number Raydyne Number Twin Spindle


Both coils traverse together
One Two
upwards over component
10 mm - 75 mm 75 mm - 240 mm 10 mm - 75 mm
diameter diameter diameter
Quench coil spraying water-based
1,100 mm travel 1,800 mm length 1, 000 mm length coolant onto heated area

Turnaround Times

Typically 2 days, however a faster turnaround can be arranged for urgent work.

116-118 Stoddard Road, Mt Roskill, PO Box 57025, Owairaka, Auckland 1041, New Zealand
Enquiries: Ph: +64 9 621 0020, Fax: +64 9 621 0019, Email: info@heat-treat.co.nz Web: www.heat-treat.co.nz

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