Note: Hardening Bed Knife Blade for Reel Type Lawn Mowers

Objective:

Harden a selected area on an 18 in (457.2 mm) bed knife blade for a reel type lawn mower. The hardness desired is between 45 to 55 Rockwell C, and should be measured 0.062 in (1.6 mm) from the cutting edge.

End Product:

bed knife mower blade

Equipment:

Ambrell 20 kW induction heating system equipped with a remote workhead containing four (4) capacitors totaling 1.0‚ μF An induction heating coil designed and developed specifically for this application. 

Materials:

1070 Steel Bed Knife Blade measuring 18"(457.2mm) long, 1 17/32 in wide (38.9mm) and 0.135"(3.4mm) thick.

Temperature:

1550 °F(843.3 °C)

Frequency:

108 kHz

Testing:

A single-turn channel coil with ceramic guides is used to scan along the length of the blade for 30 seconds to reach 1550 °F (843.3 °C). Immediate quenching and rigid fixturing is necessary to prevent blade distortion.

Benefits:

  • Precise & accurate placement of heat

  • Consistent and repeatable results

  • Non-contact clean heat 

Hardening Bed Knife Blade for Reel Type Lawn Mowers

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