The present invention provides a technique in which service life of a coolant application device can be extended. The coolant application device includes a nozzle body which spouts coolant, a hollow shaft which rotates the nozzle body, a motor which controls a rotation angle of the hollow shaft, and an Oldham coupling portion which connects the hollow shaft and an output shaft of the motor, the Oldham coupling portion transmits driving force of the motor to the hollow shaft, allowing a misalignment between an axis of the hollow shaft and an axis of the output shaft.

A coolant tank includes: a tank main body configured to store a coolant discharged from a processing machine; a vortex flow generator that creates a vortex flow of the coolant in the tank main body; and a float configured to float on a liquid surface of the coolant stored in the tank main body. An outer peripheral portion of the float has a shape conforming to a shape of an inner peripheral wall surface of the tank main body and forming a gap between the outer peripheral portion and the inner peripheral wall surface.

A coolant distribution system uses two premixed streams of coolant at either extreme of a concentration range, and mixes these two streams in the correct percentage to obtain the desired concentration. Mixing the two streams follows a pulse width approach, and the system may use a manifold to deliver fluid to multiple machines.

A machine tool that machines a workpiece by a tool includes a workpiece spindle device that holds the workpiece in a rotatable manner with a predefined workpiece rotational axis Rw as a center, one or more in-machine robots, and a connecting mechanism that attaches the one or more robots on the machine tool so that the one or more robots move independently from the workpiece, with the workpiece rotational axis Rw serving as a center.

A device for cooling and lubricating a tool during a chip removal machining process, which includes: a first subsystem for cryogenic cooling that includes: a first entry configured to introduce CO.sub.2 in liquid state in a first conduit of the device; a first exit configured to supply CO.sub.2 in liquid state from a second conduit of the device; a third conduit located between the first and second conduit; and means for preventing the formation of dry ice in the first, second and third conduits; and a second subsystem for lubrication that includes means for supplying micro-particles of a cutting oil in liquid state; wherein the first subsystem and second subsystem are independent from each other, and wherein the first subsystem and second subsystem are configured to act either simultaneously or either one alone. Method of operation of the device.

The present invention relates to a cooling system comprising a spray unit for spraying a coolant. The present invention further relates to a machining device which comprises a cooling system of this type. The spray unit comprises a flow guide which is coupled on one side to a chamber and is coupled on the other side to one or more channels, where the chamber, the flow guide and the plurality of channels form a closed system for spraying from the channels pressurized coolant fed to the chamber, where the flow guide, the plurality of elongated channels and the chamber are manufactured as an integral part.

A fluid supply apparatus according to an embodiment of the invention includes a housing and an internal structure which is housed in the hosing. The internal structure includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion. A plurality of flow paths are formed between the plurality of protrusions, and a groove having a predetermined depth from the outer circumferential surface of the shaft portion is formed in each of at least a part of the plurality of flow paths.

A fluid supply apparatus according to an embodiment of the invention includes an internal structure and a housing such as a pipe body configured to house the internal structure. The internal structure includes a first portion, a second portion, a third portion, and a fourth portion formed integrally on a common shaft member having a circular cross-section. The first portion is positioned upstream of the housing when the internal structure is housed in the housing and includes a shaft portion and a at least one spiral vane. The second portion is positioned downstream from the first portion and includes a shaft portion and a plurality of protrusions. The third portion is positioned downstream from the second portion and includes a shaft portion and at least one spiral vane. The fourth portion is positioned downstream from the third portion and includes a shaft portion and a plurality of protrusions.

A method for supplying cutting oil in a machine tool for cutting work pieces, including the steps of retaining cutting oil in a minimum reference quantity or an initial reference quantity in the cutting-oil tank, measuring a supply quantity per unit time q of the cutting oil flowing out from the cutting-oil tank and supplied to a cutting area of work pieces, either supplying the cutting oil to the cutting-oil tank by a quantity per unit time q larger than q and the supply is stopped in the case where the cutting-oil tank is filled, and the supplying and stopping are repeated as necessary, or supplying the cutting oil to the cutting-oil tank by a quantity per unit time equal to the supply quantity per unit time q.

An embodiment of the present invention provides a nozzle assembly including a base module and a nozzle module for discharging a fluid entering the nozzle assembly to the outside. The base module includes a supporting member comprising a shaft portion, a dial-type handle for rotating the supporting member, and a fixing member for detachably fixing the nozzle module. The nozzle module has one or a plurality of flow paths formed in a direction orthogonal to the shaft portion of the supporting member of the base module. Further, the angle of the nozzle module with respect to the shaft portion of the supporting member of the base module is adjusted by manual rotation of the dial-type handle.