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| Distortion of machining dimensions from thermal deformation - In the past, the main strategy for combating thermal distortion on machine tools was to limit heat generation to the minimum. The new thinking adopted in the Thermo-Friendly Concept is, as the name indicates, to co-exist with heat rather than fight it. Thermal deformation occurs in complex patterns that make it difficult to predict; however, if thermal distortion is allowed to occur only in predictable shapes, the effects of heat can be effectively canceled through correction. This is done with the use of: |
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With this technology high machining accuracies can be maintained even without large cooling systems or extensive equipment such as temperature-controlled rooms.
Double-column machining centers and other large machine tools have large axis travel, and proportionately more deformation. There is also a tendency for distortion as a result of vertical temperature differences. At the point of machining, such deformation can have effects from several dozen microns to several tenths of a millimeter in size.
With the use of the Thermo-Friendly Concept on Okuma's double-column machining centers for 5-sided applications, this thermal deformation can be reduced to one-fourth. Warming-up and temperature-controlled rooms are no longer needed, and steps do not appear even with continuous die operation for long hours with the initial zero offset, no matter where the workpiece is on a large table. |
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![[Thermal matrix] X-axis table longitudinal direction](images/i_02.gif)  |
Thermal deformation causes dimensional changes on the micron level that are difficult to see with the naked eye. The "thermal matrix" is a machining sample that allows you to see these changes.
Machining is normally done under factory environments in which temperature changes (9°C in 48 hours). In the "thermal matrix", a grid in which the machining depth in a flat finished sample becomes 5 μm shallower is scored in vertical columns. Two hours later the same machining is repeated, with the direction shifted to horizontal rows. This machining is continued every 2 hours.
With machine thermal deformation (misalignment of position on X axis) from room temperature changes or other causes, machining traces of the changes between the tool edge and workpiece can be seen. Thermal deformation at the micron level that occurs with actual machining can then be clearly seen with the naked eye.
Confirm the high performance of a double-column machining center equipped with the Thermo-Friendly Concept with your own eyes.
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