High accuracy case 1

I want to make dimensionally stable spindles.

Correcting distortion after heat treatment causes stress, which in turn causes dimensional instability.Therefore, it becomes essential to suppress the distortion at quenching, i.e. to decrease the retained austenite amount. Several methods help decrease the retained austenite amount.

1. Adjusting carbon potential at quenching
2. Performing sub-zero treatment after quenching
3. Super sub-zero treatment is more effective

We strive for correction-free treatment by setting products vertically even for long pieces and using such equipment and know-how to cool in a salt bath.

Results

Conventional method: retained austenite amount 15%
Optimized method: retained austenite amount less than 3%
We can also examine for a retained austenite amount.

High accuracy case 2

I want to nitride a precision mold with a dimensional change ratio of around a thousandth.

We can suppress the dimensional change by treating it with lower temperature for longer time than that of typical treatment conditions. We have achieved the result of less than 5/1000 mm dimensional change.

High accuracy case 3

I happened to process the finish touch on molds before heat treatment. Is it possible to harden the surface with zero dimensional change?

In this case, only the surface hardness was required, so we could treat with low temperature Tufftride (salt bath soft nitriding) to achieve almost no dimensional change.

High accuracy case 4

I want to eliminate the distortion of shafts.

A certain shaft manufacturer requested us to eliminate the distortion of shafts Ф28 x 400 (S55C).In this case, we had to suppress the distortion at quenching so as not to cause dimensional instability by correcting distortion after quenching.
We have achieved distortion of less than 0.02 mm at quenching by arranging materials and suppressing distortion during induction hardening.