Induction Shrink Fitting Machine - Agni Induction Technologies

Gears/Shafts

Gears and shafts are critical mechanical components whose durability and performance are significantly enhanced by induction hardening, a surface heat treatment process that strengthens them against wear, fatigue, and impact without compromising their internal toughness.

Spin Hardening: Used for small- to medium-sized gears and shafts, this method involves rotating the entire component within an encircling induction coil for even heating before quenching.
Tooth-by-Tooth Hardening: For large gears (typically with pitch diameters > 200mm), an inductor progressively heats and quenches each tooth individually. This method requires less power and offers precise control over the hardness pattern.
Vertical Scanners: Often used for longer shafts and axles, these machines use an induction coil that scans along the length of the rotating workpiece, hardening the surface in a continuous process.
Indexing Tables: For high-volume production of smaller gears and shafts, indexing tables rotate components through multiple stations (loading, heating, quenching) to maximize throughput.

Motor Assembly

induction heating provides a precise, non-contact method for high-speed joining and component preparation. It is primarily used for shrink fitting, where thermal expansion allows for seamless assembly of interference-fit parts without mechanical force.

Stator-in-Housing Shrink Fitting: The aluminum or steel motor housing is heated uniformly until it expands, allowing the stator to be dropped in with ease. Upon cooling, the housing contracts to form a high-strength mechanical bond.

Shaft-to-Rotor Joining: Induction precisely heats the rotor lamination stack or the bore of a gear/shaft, enabling the rotor shaft to be inserted with minimal resistance.

Bearing Installation: Induction heaters expand the inner race of motor bearings to a target temperature (typically around 100°C – 110°C), ensuring they slide onto the shaft perfectly without damaging the journal surface.

Rotor Brazing: For squirrel-cage rotors, induction is used to braze short-circuit rings and copper bars, ensuring consistent, high-quality electrical connections.

Bonding & Curing: Rapid induction heating is used to cure epoxies for magnet bonding in rotors or to preheat components for resin trickling and powdering.

Bearing Assembly

Bearing assembly often involves creating a precise interference fit between the bearing and its associated shaft or housing. The preferred method in modern manufacturing is induction heating for shrink fitting, which offers a clean, fast, and controlled alternative to mechanical pressing or traditional heating methods.

hrink Fitting the Inner Ring onto a Shaft: This is the most common use. The bearing’s inner ring is heated rapidly using a specialized induction heater, causing it to expand. It is then easily slid onto the shaft’s journal without the need for excessive force that could damage the bearing race or the shaft surface.

Shrink Fitting the Outer Ring into a Housing: Similar to fitting the inner ring, the outer ring is heated to allow for seamless installation into a housing bore.

Sealed Bearing Installation: The precise control of induction heating is crucial for sealed or pre-greased bearings, as the localized, rapid heat prevents damage to the seals and avoids melting or degrading the internal lubricant.

Gears/Shafts

Motor Assembly

Bearing Assembly

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