Induction Hardening Saw Blades

Induction Hardening Saw Blades With High Frequency Heater

Objective Utilizing induction heating to draw back steel saw blades to a Rockwell hardness of between 50 and 52. The hardness should be within 1/2 to 1 point between the teeth and the back of the blade. Processing must be performed at a rate of 60 inches per minute
Material Steel band saw blade measuring 2.125″ wide, 0.042″ thick
Temperature 700 ºF
Frequency 100 kHz
Equipment DW-UHF-10kW output solid-state induction power supply with a step down transformer and a remote heat station containing three (3) busses and eight (8) capacitors with a total capacitance of 0.66F. A water-cooled coil was designed and developed specifically for this application utilizing single and
double turns
Process :The Ameritherm equipment was used to achieve the following goals:
· The necessary heat pattern was accomplished through the use of a uniquely designed channel coil and a step down transformer to reduce the voltage
· A feed rate of 60 inches per minute was also met through the use of the unique channel coil and specifically designed fixture.
Results Resulting: mean hardness of 50.3 Rc was measured for fifteen saw teeth on a Wilson Superficial Hardness Tester, fulfilling the ultimate goal established by the customer.