Chip breaker on PCBN reduces down-time

In finishing turning of hardened steel components, where the hardness is 60-62 HRC with CBN, a chip breaker is not needed, but when the hardness is lower, problems with long chips can occur. This was the case at one customer machining components with a hardness of 50 HRC.

The solution was to use inserts with chip breaker, and chip breaking was improved, and as an added bonus tool life was also longer than with the competitor insert.

Seco Tools has been very active in the area of machining case hardened steel for many years.

After heat treatment, gearbox components like gears and shafts usually have a hardness of 60-62 HRC. During the subsequent hard turning, chip control is not a problem, the chips are brittle and will break also without a chip breaker.

When machining components with a lower hardness, there can be problems with long and stringy chips, which can scratch the surface, interfere with the tool holder and clamping or otherwise negatively impact the machining operation, increasing the need for machine stops to clean the machine.

In this case, the hardness of a shaft was only 50 HRC, and the customer had problems with chips scratching the surface. The Seco solution was to use a chip breaker insert.

With the chip breaker insert, there was no need to stop the machine and remove chips anymore, resulting in a much more trouble-free production, and reducing the machine down-time.

For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.

Henrik Sandqvist
SECO TOOLS Shanghai CO., Ltd. Building 4, No 797,
Puxing Road, Pujiang Town, Minhang District,
Shanghai 201114, China
Office: +86 21 5426 5849
Mobile: +86 185 1520 6942

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