shrink-fitting a Fuel Pump Housing and Inserts

Objective

To heat an aluminum fuel pump housing measuring 8" x 4 1/2" x 3 1/2" to 3750F, allowing steel parts to be inserted. Presently the housings are heated for over one hour in a convection oven. The areas that are to have steel parts inserted measure 1.5" and 0.6875" in diameter. In addition, the insertion process lasts for a little over one minute, so 3750F should be maintained for a period of time to complete the process.

End Product

fuel pump

Equipment

Ambrell 25 kW output solid state induction power supply including one (1) remote heat station containing four (4) capacitors totalling 1.0 µF, and a five (5) turn right angle pancake coil made from 3/16" copper tube.

Materials

Aluminum Pump Housing measuring 8" x 4 1/2" x 3 1/2" Steel insertion parts.

Temperature

375º F

Frequency

100 kHz

Testing

Benefits

By using the Ambrell induction system, the following results were achieved.

◦ 375º F was reached in one (1) minute to allow for insertion.

◦ 20 housings were successfully heated using a five (5) turn right angle pancake coil.

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