The photo shows a cut sample for a guide rail for linear accuators
hardened by our induction hardening machine.

The pattern seen on the cut sample shows that the shaft has been
hardened down to the bottom of the guide rail grooves.

The most difficult part of hardening this workpiece is preventing runout.
During scan hardening of the groove, the concave guide rail slightly twists.

Runout in the vertical or horizontal direction only can be corrected,
but twisting is not so easily corrected, which in general resultsin many
defective hardened parts and increased lead time.

Through extensive trial and error, we at Fuji Denshi developed
a combination of hardening machine, coils, and jigs to minimize runout.

We offer similar solutions for optimal hardening of a wide variety of workpieces.
Please contact us with your hardening needs.