A machine tool controller according to an embodiment of the present invention, for controlling a spindle and a feed axis, includes a motor temperature obtaining unit for obtaining and outputting the winding temperature of a spindle motor as a motor temperature; an inverter temperature obtaining unit for obtaining and outputting the temperature of an inverter that drives the spindle motor as an inverter temperature; a motor temperature comparator for comparing the outputted motor temperature with an overheat temperature for the motor; an inverter temperature comparator for comparing the outputted inverter temperature with an overheat temperature for the inverter; and an overheating assessment unit for imposing a restriction on the output of the spindle motor according to the smaller one of the differences between the motor temperature and the overheat temperature for the motor and between the inverter temperature and the overheat temperature for the inverter.

A spindle structure capable of accelerating the flow of a fluid in through holes of a rotor. The spindle structure includes a rotatable rotation part. The rotation part includes a tool holding part provided at an axial direction one end of the rotation part and through holes that penetrate the rotation part and open at the end in the axial direction. Further the spindle structure includes a vane provided in the through holes. When the rotation part rotates, the vane rotates with the rotation part to allow a fluid in the interior of the through holes to flow toward the end in the axial direction.

A power-tool cooling apparatus for a portable power tool comprises at least one cooling unit configured to generate a cooling fluid flow to cool a drive unit of the portable power tool, and at least one further cooling unit configured to generate a further cooling fluid flow. The at least one further cooling unit is designed to differ from the at least one cooling unit.

An adaptive cooling control method used in an adaptive cooling control system includes a controller installed in a machining center, a temperature sensor installed in a main shaft unit of the machining center, a temperature acquisition device and a main shaft cooling system. A built-in macro program unit of the controller determines whether the temperature of the main shaft falls within a predefined temperature rise range, and if so, the current cooling control parameters are maintained. If the temperature of the main shaft exceeds the predefined temperature rise range, appropriate cooling control parameters are calculated and provided to the dmain shaft cooling system for an adaptive control.

A machine tool includes a thermoacoustic apparatus and a fluid supply apparatus, utilizes exhaust heat from a constituent apparatus of the machine tool to cool a heat exchanger included in the thermoacoustic apparatus due to a thermoacoustic effect. Thus, a cooling fluid is cooled which is used to cool a bearing and a machining point.

A temperature control device includes a machine body temperature sensor which measures a machine body temperature at a portion separated from a spindle device, a return oil temperature sensor which measures a temperature of cooling oil which circulates in a machine tool and which is collected by the temperature control device, an oil controller which includes at least two oil control modules, each having a cooler and which control the temperature of the cooling oil so that the temperature of the cooling oil detected by the return temperature sensor is synchronized with a reference temperature set based on a machine body temperature, in which tanks thereof communicate with each other, and the at least two oil control modules are connected in parallel to the machine tool, and a piping connection manifold for uniformizing convergence of the cooling oil to the machine tool and branching to each of the oil control modules.

A bearing device includes a rolling bearing having an outer ring and an inner ring, an outer ring spacer disposed adjacent to the outer ring, and an inner spacer disposed adjacent the inner ring. The outer ring and the outer ring spacer are fitted to a housing, and the inner ring and the inner ring spacer are fitted to a rotary shaft. The outer ring spacer is provided with a nozzle, which is configured to inject a cooling fluid (R) toward an outer circumferential surface of the inner ring, and is inclined so that an injection port thereof is inclined forwardly in a rotation direction of the inner ring. An inclination angle of the nozzle with respect to an axial direction is set to a value within a range from 50 to 90.

A spindle-bearing protecting device for protecting a bearing that supports a spindle so as to be rotatable, includes: a rotating part positioned further to an outer side in an axial direction than the bearing, and having a rotor blade configured to rotate along with the spindle; a supply part configured to supply coolant or lubricant between the rotor blade and the bearing; a detection unit configured to detect abnormality of the bearing; and a control unit configured to control a supply of the coolant or the lubricant by the supply part and a revolution speed of the spindle, in a case where the detection unit detects abnormality of the bearing.

A cooling gas is fed from an ejection nozzle into the interior of a through-hole which is formed in a radially central portion of a main spindle, and which penetrates through said main spindle in an axial direction. The cooling gas passes through radial venting holes provided in a plurality of locations, in the circumferential direction, in an axially intermediate portion of the main spindle, is fed into axial venting holes provided in a plurality of locations, in the circumferential direction, extending from one axial-direction end of the main spindle to an intermediate portion thereof, is caused to flow through the axial venting holes, and is discharged from discharge holes.

A drilling byproduct recovery system employs a vacuum shroud positioned adjacent a workpiece. A spindle extends from a base and engages a tool. The spindle vertically reciprocates the tool upwardly through an aperture in the vacuum shroud to engage the workpiece. A circumferential air jet is emitted proximate a base of the spindle and directed toward the vacuum shroud.