Hardening Saw Blades with Induction

induction hardening induction hardening saw blades

Objective:
Utilizing induction hardening 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 °F

Frequency: 200 kHz

Equipment:
DW-UHF-70kW 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 0.66|JF. A water-cooled coil was designed and developed specifically for this application utilizing single and double turns

Process:
The DaWei induction heating 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.

induction hardening saw blades and teeth