shrink-fitting a cast iron rocker arm assemblies

Objective

To use induction to prepare cast iron assemblies for shrink fit assembly.

End Product

rocker arm

Equipment

Ambrell EASYHEAT 5.0 kW, 150-400 kHz solid state induction power supply with a workhead and coil specifically designed for this application.

Materials

Customer supplied cast iron rocker arms of varying sizes.

Temperature

450 ºF (232 ºC)

Frequency

150 kHz

Testing

A four-turn helical coil designed by THE LAB at Ambrell heats the ring at one end of the assembly. The coil is designed to concentrate the field towards the center of the assembly where the thermal mass is greatest. Across the heated ring, the coil presents a lighter field. After heating, a pin is placed within the ring and the assembly is water quenched. The heat time varies from part to part but is less than 20 seconds.

Benefits

Induction heating offers this application:

• Rapid part heating

• Even heat distribution

• Flexibility for parts of differing geometries

• Individual, series part heating, suitable for automation

• A clean source of heat

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