Note: Achieving Uniform Hardness on Saw Blades
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
End Product:
Steel saw blade
Equipment:
Ambrell 7.5kW 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
Materials:
Steel band saw blade measuring 2.125" wide, 0.042" thick
Temperature:
700 ºF
Frequency:
80 kHz
Testing:
The Ambrell 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.
Benefits:
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.
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