Mori Seiki has introduced an advanced machine control feature designed to compensate for thermal displacement in structural components caused by ambient temperature fluctuations and heat from ball screws and motors, significantly reducing machining errors. This system utilizes thermal sensors mounted on the top or column of the machine to detect temperature changes in real time. Based on this data, the system predicts displacement and automatically adjusts the position of the spindle and tool holder accordingly.
Traditionally, controlling thermal displacement required preheating the machine before operation or increasing air conditioning in the workshop—methods that are not only inefficient but also costly. The new function eliminates the need for such external measures, ensuring consistent machining accuracy regardless of environmental conditions or processing procedures.
The innovative control system uses a computer to simulate and determine the optimal placement of thermal sensors based on the machine's thermal behavior. While the machine is in operation, high-speed calculations are performed to correct the position of the feed axis in real time. Mori Seiki implemented this feature on its "NL" series NC rotary table, where testing showed that thermal displacement was limited to 5–8 micrometers after 4 hours of a 10°C temperature change. Without this function, the displacement reached up to 50 micrometers under the same conditions.
This technology will be showcased at the JIMTOF2006 (23rd Japan Machine Tool Show) held at the Tokyo Ariake International Convention and Exhibition Center from November 1st to 8th, 2006. It will be featured on the NC rotary table "NL2500" and the vertical machining center "NV6000 DGG." Following the exhibition, the function will be available for the "N" series NC rotary tables and the MC12 models, marking a major step forward in precision machining.
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