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Thermo-Friendly Concept?

The unique approach of "accepting temperature change." Thermo-Friendly-Concept

Getting on friendly terms with heat is what it's all about. Machine tools to date have been built to reduce heat as much as possible. The new idea, while still trying to minimize the amount of heat generated, is to deal with the heat that cannot be eliminated despite these attempts.

Thermal deformation occurs in complex ways, and predicting the amount of displacement is nearly impossible. However, if we can arrange for thermal deformation to occur only in predictable ways, it may be possible to eliminate the effects of heat through compensation. Thus, even without large-scale air conditioning equipment, high machining accuracy can be maintained.

fig. Thermo-Friendly-Concept

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1 Ingenious new ways Okuma uses to deal with fluctuations in ambient temperature

Manageable deformation means, machining at points based on "thermally symmetric structures," machine components simplified into "box-build structures" (building blocks), and covers and peripheral units arranged to "equalize ambient temperatures" (eliminate hot spots).

Naturally the cutting operation itself, motor drives, and moving components will raise machine temperatures, along with hot chips and coolant, and machine shop door opening/closing will affect ambient temperatures. Okuma machines are designed to expand in predictable directions.

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2 Designing out heat generated by the machine

Spindle thermal deformation occurs during spindle rotation, from stop operations, and from frequent spindle speed changes―which affect machining accuracy.

TAS-S (Thermal Active Stabilizer―Spindle) in addition to spindle temperature data, will monitor spindle speed, speed changes, spindle stop, and other conditions. Spindle deformation will be accurately controlled even during operations with frequent speed changes.

During actual machining, in addition to machine structure thermal deformation, machining dimensional changes are related to the cutting position (workpiece clamped position on the table for machining centers, workpiece size for lathes).

TAS-C (Thermal Active Stabilizer―Construction), based on the machine's tendency to deform in certain directions, will also use temperature readings from appropriately placed sensors and feed axis position data to estimate machine structure deformation from ambient temperature changes, to accurately control the actual cutting point.

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