JP5607105B2 - Method of cooling a turning tool in an NC lathe and an NC lathe provided with a turning tool cooling mechanism - Google Patents

Description

  The present invention relates to a method for cooling a turning tool in an NC lathe that cools a turning tool that is heated by machining heat during turning by means of the heat of vaporization of cooling water to be poured, and an NC lathe equipped with a turning tool cooling mechanism. Is.

  In an NC lathe, a turning tool becomes hot due to machining heat during turning. In particular, the higher the turning conditions, such as higher speed for improving productivity and machining of difficult-to-cut materials for improving product performance, the higher the temperature of the tool, the lower the machining accuracy, the surface quality of the workpiece, and the tool life. This causes various problems.

  On the other hand, in order to suppress the high temperature of the tool due to this processing heat, wet processing in which a large amount of cutting oil is poured during turning is performed, but it has been pointed out that there is an adverse effect on the global environment. In order to alleviate this, various coolant waters for cooling have been proposed. However, since a large amount of water is consumed, there are various problems such as efficient collection and high cost.

  Also, various cooling methods such as dry cutting, oil mist processing (semi-dry cutting) and cold air cutting have been proposed, but none of them are sufficient measures yet.

  Further, for example, a porous water absorbing layer is provided in the vicinity of the blade edge as in Japanese Patent No. 3333284 and a small amount of refrigerant is supplied to the water absorbing layer, and the refrigerant absorbed in the water absorbing layer is vaporized by processing heat. However, although a method of cooling the tool by removing heat by this heat of vaporization has been proposed, the amount of water injection cannot be controlled, so that sufficient cooling action is not demonstrated compared to wet processing, or conversely, the amount of water injection is excessive Then, there was a risk of rusting on workpieces and equipment.

  In particular, when the air is cut until the turning tool comes into contact with the workpiece, the processing heat is not yet high, which causes wasteful consumption of water and rusting, and also necessitates recovery and increases costs. .

Japanese Patent No. 3333284

  In view of such a current situation, the present invention finds out the above-mentioned problems and solves these problems, and an appropriate small amount that is not sufficient and excessive to evaporate by processing heat and cool the tool by the heat of vaporization. By setting the water injection amount in advance or automatically controlling at the time of processing, it achieves the cooling effect equivalent to that of wet processing by evaporative heat cooling of water, and it does not cause a large amount of water to be dropped unnecessarily, resulting in efficient cooling and high cost. Even if a small amount of water is dropped, alkaline ionized water is used, so there is no problem of rusting or corrosion, and unlike other coolant water, there is no cost, so there is no need for recovery circulation unless water is injected excessively. When using strong alkaline ionized water with a pH of 12 or more, there is almost no problem of rust and corrosion, and it has a cleaning effect. And its object is to provide an NC lathe having a cooling mechanism of the cooling method and turning tools of cutting tool.

  In addition, the present invention can exert a sufficient cooling effect with a small amount of alkaline ionized water without wasteful water consumption by ejecting an appropriate amount from the nozzle portion in a spot manner toward the cutting edge portion. In addition, it can be set in advance according to various processing conditions so that the water injection amount becomes the appropriate water injection amount as described above, or is automatically automatically controlled at the time of processing based on the processing information (NC information) of the NC control unit and the sensing result. In addition, the innovative NC lathe can be efficiently cooled without causing various problems by controlling the water injection only when turning, so that the above functions and effects can be demonstrated better. It is an object of the present invention to provide a method for cooling a turning tool and an NC lathe equipped with a turning tool cooling mechanism.

  The gist of the present invention will be described with reference to the accompanying drawings.

Cooling water 4 is injected from the nozzle portion 3 disposed toward the cutting edge portion 2 of the turning tool 1 to the cutting edge portion 2 and vaporized by the processing heat generated during the turning process, and the cutting edge portion 2 is cooled by the heat of vaporization. A cooling method for a turning tool in an NC lathe, wherein the cooling water 4 is alkali ion water 4, and the water injection amount is a sufficient water injection amount that is vaporized by the processing heat and produces a cooling action by the heat of vaporization, and A water injection control mechanism is provided which sets an appropriate amount of water that is not vaporized and the amount of excess water consumed is small. The amount of water injection is set in advance according to the turning conditions or is automatically controlled at the time of machining, and the turning tool 1 is attached to the workpiece 6. On the basis of NC information that can be acquired at the time of turning start or stop at the NC control unit 5 that controls movement, or when the turning tool 1 contacts the workpiece 6 Time or by controlling the opening and closing valve and the water injection driving unit 8 controls the water injection operation from the nozzle 3 on the basis of separating the the time turning stop detection of the detection unit for water injection ON · OFF to detect, ON · OFF water injection In addition to controlling the pump operation of the water injection drive unit 8 or the opening / closing degree of the open / close valve, the water injection is performed so that the appropriate water injection amount is always injected from the nozzle unit 3 toward the turning tool 1 during the turning process. constitute a control mechanism, toward from the nozzle unit 3 to the cutting edge portion 2, a small amount of the alkali ion water 4 water injection timing and injection time of the flow rate is set to the proper water injection amount is controlled in the spot The present invention relates to a method for cooling a turning tool in an NC lathe, characterized by being ejected during turning.

In addition, the water injection control mechanism that automatically adjusts the water injection amount to the appropriate water injection amount in advance or sequentially controls at the time of machining and also performs ON / OFF control of water injection, controls the movement of the turning tool 1 relative to the workpiece 6. and configuration using the NC control unit 5, the said output from the NC control unit 5 based on the cutting feed command is NC information, before Symbol cutting feed time immediately before or simultaneously to the workpiece 6 of the turning tool 1 or A water injection ON / OFF control signal for starting / injecting water from the nozzle unit 3 immediately after that, and switching discharge / stop of water injection so that water injection from the nozzle unit 3 is stopped immediately before, simultaneously with or immediately after completion of cutting feed, The NC control unit 5 outputs a water injection amount control signal for determining the water injection amount and controls the water injection operation from the nozzle unit 3. Those relating to the cooling process of turning tool in the panel.

In addition, the turning tool 1 is detachably provided on the tool post 7 which is moved and controlled by the NC control unit 5, and the nozzle portion 3 is provided toward the cutting edge portion 2 of the turning tool 1. 3. The turning tool in an NC lathe according to claim 2, wherein the water injection drive unit 8 for ejecting the alkaline ionized water 4 is controlled by the control signal output from the NC control unit 5. This relates to the cooling method.

  Further, the ON / OFF detection unit is configured to detect whether or not the turning tool 1 is in contact with the workpiece 6 by detecting a load on the spindle of the turning tool 1. It concerns on the cooling method of the tool for turning in NC lathe any one of claim | item 1-3.

  5. The cooling of a turning tool in an NC lathe according to claim 1, wherein the alkaline ionized water 4 is a strong alkaline ionized water 4 having a pH of 12 or more and having a cleaning power. It concerns the method.

  6. The cooling method for a turning tool in an NC lathe according to claim 1, wherein pulsating water is injected by adding ultrasonic waves to the strong alkaline ionized water 4. Is.

In addition, a nozzle portion 3 is disposed toward the cutting edge portion 2 of the turning tool 1, and cooling water 4 is ejected from the nozzle portion 3 to the cutting edge portion 2 to be vaporized by the processing heat generated during the turning process. An NC lathe equipped with a cooling mechanism for a turning tool that cools the cutting edge portion 2 by heat, wherein the cooling water 4 is alkali ion water 4, and this water injection amount is vaporized by the processing heat and cooled by the heat of vaporization. The cooling mechanism is configured with a water injection control mechanism that has a sufficient water injection amount that causes an action and an appropriate water injection amount that causes less excess water to be consumed without being vaporized, and the water injection amount is preset or processed according to the turning conditions. Based on the NC information that can be obtained at the time of turning start or turning stop in the NC control unit 5 that controls the turning of the turning tool 1 with respect to the workpiece 6. Or closing valves and controls the injection operation from the nozzle unit 3 based on the detection of the water injection ON · OFF for detection portion to which the turning tool 1 to the workpiece 6 to detect the at turning start or away the turning stopped in contact The water injection drive unit 8 is controlled to control ON / OFF of the water injection , and the pump operation of the water injection drive unit 8 or the opening / closing degree of the open / close valve is controlled so that the nozzle unit 3 always turns the appropriate water injection amount when turning. The water injection control mechanism is configured so as to inject water toward the turning tool 1 from the nozzle portion 3 toward the blade edge portion 2, and the water injection timing and the flow rate at the time of water injection are controlled as a spot. a small amount of the alkali ion water 4 set in the water injection amount, which relates to a NC lathe provided with a cooling mechanism of the turning tool, characterized in that the configuring to eject when turning

  Since the present invention is configured as described above, water is automatically controlled at the time of presetting or processing at an appropriate small amount of water injection that is vaporized by the processing heat and sufficient and not excessive to cool the tool by the heat of vaporization. Evaporative heat cooling achieves the same cooling effect as wet processing, and does not cause a large amount of water to be dropped unnecessarily, resulting in efficient cooling and no cost increase. Even if a small amount of water is dropped, alkaline ionized water is used, resulting in rusting. There is no problem of corrosion or corrosion, and unlike other coolant water, there is no cost, so there is no need for recovery circulation unless water is injected excessively, and an excellent NC lathe cooling method and turning tool cooling mechanism NC lathe equipped.

  In addition, the present invention can exert a sufficient cooling effect with a small amount of alkaline ionized water without wasteful water consumption by ejecting an appropriate amount from the nozzle portion in a spot manner toward the cutting edge portion. In addition, it can be set in advance according to various processing conditions so that the water injection amount becomes the appropriate water injection amount as described above, or is automatically automatically controlled at the time of processing based on the processing information (NC information) of the NC control unit and the sensing result. In addition, the innovative NC lathe can be efficiently cooled without causing various problems by controlling the water injection only when turning, so that the above functions and effects can be demonstrated better. The NC lathe is provided with a method for cooling a turning tool and a turning tool cooling mechanism.

  Further, in the inventions according to claims 2 and 3, since the amount of water injection and the discharge / stop of the water injection are controlled by the NC command, it can be configured more accurately and easily, so that it can be used for turning on an NC lathe that is extremely practical. It becomes the cooling method of the tool.

  Further, in the invention described in claim 4, it is possible to detect whether or not the machining has been accurately started with a simple configuration, and this is a cooling method for a turning tool in an NC lathe that is more practical.

  Further, in the invention according to claim 5, there is almost no problem of rust and corrosion even if the water falls or scatters, and since the cleaning function is also achieved, the further processing of the workpiece can be reduced, and the NC lathe can be further improved. This is a cooling method for turning tools.

  The invention according to claim 6 provides a superior cooling method for a turning tool in an NC lathe in which cleaning power is increased and machining efficiency is improved.

It is a schematic structure explanation perspective view of NC lathe of this example. It is a schematic block diagram of an NC lathe according to the present embodiment. It is a description perspective view of the principal part of NC lathe of a present Example. It is operation | movement explanatory drawing at the time of turning of the principal part of the NC lathe of a present Example.

  The preferred embodiment of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

  Appropriate water injection amount set in advance according to the turning conditions such as the shape and material of the turning tool 1, the shape and material of the workpiece, the machining position, the machining speed (rotation speed of the rotary table) and the cutting depth Alternatively, an appropriate water injection amount calculated and determined by an arithmetic expression based on theory or experimental data is set in advance, or the conditions, other NC information of the NC control unit 5, the temperature around the blade edge portion 2 measured in real time, etc. Based on the sensing result, automatic adjustment control is automatically performed to the appropriate water injection amount sequentially at the time of machining, and this appropriate water injection amount is injected from the nozzle portion 3 toward the turning tool 1.

  That is, in order to prevent the tool 1 from becoming high temperature due to the processing heat generated during the turning process in which the turning tool 1 is brought into contact with the turning workpiece 6, the processing heat is vaporized by this heat of vaporization. The cooling action that takes heat away and cools it is a sufficient amount of water that can be cooled in the same way as conventional wet processing where a large amount of cutting oil and coolant water is poured. Do not let a large amount of water fall unnecessarily by presetting or automatically controlling the appropriate amount of water to be as small as possible (a small amount of water that is not required to be excessive as much as possible). It can be efficiently cooled without causing rust and corrosion problems and without increasing costs.

  In addition, since the water is sprayed directly from the nozzle portion 3 onto the cutting edge portion 2 of the turning tool 1, the amount of water can be reduced as much as necessary, and the cooling can be performed more efficiently. it can.

  Further, even if a small amount of water falls and scatters, it is alkaline ionized water, so that problems of rust and corrosion hardly occur.

  In addition, since alkaline ionized water is easy to manufacture or obtain, the cost is not high, and the recovery circulation is not required unless a large amount is excessively injected.

  Further, if strong alkaline ionized water having a pH of 12 or more is used, corrosion problems such as rust hardly occur, a cleaning effect is achieved, and processing after processing can be reduced.

  In addition, the present invention directly injects water into the cutting edge portion 2 of the turning tool 1 in a spot manner by the nozzle portion 3 as described above, and injects an appropriate amount of water (only a necessary and sufficient amount). Based on the NC information that can be acquired at the turning start time or turning stop time in the NC control unit 5 so that the tool 1 is not wasted and dropped when air is cut until the tool 1 comes into contact with the workpiece 6, for example, NC Based on the cutting feed command output from the control unit 5, the start and stop of water injection from the nozzle unit 3 is controlled, or when the turning tool 1 comes into contact with the workpiece 6, the water injection ON / OFF detection unit detects the water injection. The water injection ON / OFF detection unit detects this and controls to stop water injection when it is separated.

  This water injection start / stop (discharge / stop of alkaline ion water 4 from the nozzle unit 3) is not performed manually, but automatically based on the NC information of the NC control unit 5 and the sensing result by the water injection ON / OFF detection unit. Because of this configuration, cooling can be performed more efficiently, and delay control can be performed from the start of turning to the start of water injection by taking into account the temperature of the cutting edge portion 2 of the turning tool 1 and the expected processing heat during turning. It is also possible to appropriately control the water injection timing and the water injection amount according to various conditions.

  Further, the discharge / stop timing of the water injection and the variable adjustment control of the water injection amount may be configured so that the threshold value is set and the switching / adjustment control is reliably performed by the NC command.

  In addition, a water injection control mechanism for controlling the water injection operation of the nozzle unit 3 is configured by using the NC control unit 5, and processing conditions are set in the NC control unit 5 in advance. -The stop timing, delay timing after detection, etc. may be adjusted and set, or may be automatically controlled based on the sensing signal in real time. For example, the cutting feed command output from this NC control unit 5 or this Based on the comparison between the detection signal from the water injection ON / OFF detection unit to the NC control unit 5 and other sensing signals and the threshold value, the NC control unit 5 supplies the water injection drive unit 8 that drives the water injection of the nozzle unit 3. If it is configured to output a control signal for controlling the water injection operation to control the discharge / stop and the amount of water injection (flow rate) from the nozzle unit 3, it can be used for turning on an NC lathe that is more practical. Cooling mechanism cooling method and turning tool fixings the NC lathe provided with a.

  A specific actual example of the present invention will be described with reference to the drawings.

  In this embodiment, strong alkaline ionized water 4 having a pH of 12 or more is injected from the nozzle portion 3 provided on the tool rest 7 toward the cutting edge portion 2 of the turning tool 1 to the cutting edge portion 2 to generate heat generated during turning. Thus, the cutting edge portion 2 is efficiently cooled by the heat of vaporization, and a cooling mechanism is provided that exhibits strong cleaning power without rust and corrosion problems.

  Specifically, the amount of water injected from the nozzle unit 3 is controlled by controlling the water injection drive unit 8 (pump unit 8) that draws water from the tank 9 storing strong alkaline ionized water and drives the water injection from the nozzle unit 3. A water injection control unit that controls the flow rate) to be an appropriate water injection amount that is vaporized by the processing heat and generates a cooling action by the heat of vaporization, and an excessive water amount that is consumed without being vaporized is reduced. It is configured.

  That is, a water injection control mechanism 5 that drives and controls a pump unit 8 (including an open / close valve) that controls the water injection operation by the nozzle unit 3 is provided, and the water injection amount is automatically controlled at the time of presetting or processing according to the turning conditions. Based on NC information that can be acquired at the time of turning start or turning stop in the NC control unit 5, for example, based on a cutting feed command output from the NC control unit 5, the start and stop of water injection from the nozzle unit 3 is controlled. Or a water injection ON / OFF detection unit for detecting when the turning tool 1 contacts the workpiece 6 at the start of turning and at the time of turning away from the turning, and based on this detection, ON / OFF of water injection from the nozzle unit 3 is provided. A small amount of strong alkaline ionized water 4 that is set to the appropriate water injection amount in a spot manner is ejected from the nozzle portion 3 toward the cutting edge portion 2 by controlling OFF only during turning. It is configured to so that.

  Note that both the pump operation of the water injection drive unit 8 and the opening / closing operation of the opening / closing valve may be controlled, or only the opening / closing degree of the opening / closing valve may be controlled.

  More specifically, the water injection control mechanism that automatically adjusts the water injection amount to the appropriate water injection amount in advance or sequentially controls the water injection and performs ON / OFF control of the water injection, the turning tool 1 is applied to the workpiece 6. For the turning, based on a cutting feed command output from the NC control unit 5 or based on a detection signal from the water injection ON / OFF detection unit. Water injection from the nozzle portion 3 is started immediately before, simultaneously with, or immediately after the cutting feed of the tool 1 to the workpiece 6, and water injection from the nozzle portion 3 is stopped immediately before, simultaneously with, or immediately after the completion of cutting feed. A water injection ON / OFF control signal for switching the injection / stop of water injection and a water injection amount control signal for determining the water injection amount are sent from the NC control unit 5 to the pump unit 8 (and open). And outputs to include a valve), and configured to control the water injection operation from the nozzle 3.

  More specifically, the cutting tool 1 is detachably provided on the tool post 7 that is controlled to move by the NC control unit 5, and a plurality of nozzle portions 3 are respectively changed in angle to each of the cutting edge portions 2 of the turning tool 1. In addition, it is arranged so as to contact with the vicinity thereof accurately, and the NC control unit 5 is configured to drive and control the water injection pump unit 8 that ejects the strong alkaline ionized water 4 from the nozzle unit 3.

  That is, as described above, depending on the turning conditions such as the shape and material of the turning tool 1, the type of workpiece shape and material, the machining position, the machining speed (rotation speed of the rotary table) and the cutting amount. Adjustable settings can be adjusted in advance, and the appropriate water injection amount is automatically calculated and determined by an arithmetic expression based on theory or experimental data, etc., by inputting or setting the appropriate water injection amount according to these conditions. Are set in advance, and in the present embodiment, those conditions and other NC information of the NC control unit 5, such as NC information output such as a cutting feed command, and the periphery of the cutting edge portion 2 measured in real time. Based on the sensing results of various sensors such as the temperature of the water, ON / OFF control of water injection is performed sequentially during processing, and automatic adjustment control is performed to the appropriate water injection amount at that time. It is configured to be water injection when turning toward the pole tip 3 to the turning tool 1.

  Further, when air is cut until the turning tool 1 is brought into contact with the workpiece 6, water injection is started at the start of turning to bring the turning tool 1 into contact with the workpiece 6 without causing unnecessary water injection and dropping. It is configured to stop water injection when completed.

  Specifically, for example, the workpiece 6 of the turning tool 1 based on NC information that can be acquired when the NC control unit 5 starts turning or stops, for example, a cutting feed command output from the NC control unit 5. Water injection from the nozzle unit 3 is started immediately before, simultaneously with, or immediately after cutting feed to the nozzle, and water injection is stopped so that water injection from the nozzle unit 3 is stopped immediately before, simultaneously with, or immediately after completion of cutting feed. The NC control unit 5 outputs a water injection ON / OFF control signal for switching between the two. For example, it is configured such that a water injection start control signal is output to the pump unit 8 at a timing at which a cutting feed command that can be determined to be at the start of turning is output.

  Further, ON / OFF control of water injection may be performed based on the NC information of the NC control unit 5 as described above, and when the turning tool 1 comes into contact with the workpiece 6 or when the turning operation is separated is detected. The water injection ON / OFF control signal may be output from the NC control unit 5 based on the detection of the water injection ON / OFF detection unit. In this case, for example, it is constituted by a sensor for detecting the spindle load, a shock sensor provided on the tool side, etc., and this sensing result is output to the NC control unit 5 and water injection is performed based on the sensing result by the NC control unit 5. The pumping unit 8 is configured to output a water injection ON / OFF control signal.

  Accordingly, the water injection start / stop (discharge / stop of the alkaline ionized water 4 from the nozzle unit 3) is not performed manually, and the NC information of the NC control unit 5 and the sensing result by the water injection ON / OFF detection unit are not performed. Because of the automatic configuration based on the above, cooling can be performed more efficiently, and water injection can be started from the start of turning by taking into account the temperature of the cutting edge portion 2 of the turning tool 1 and the expected processing heat during turning. The water injection timing and the water injection amount can be appropriately controlled according to various conditions such as delay control of time.

  In addition, as described above, machining conditions may be set in advance in the NC control unit 5, and an appropriate water injection amount, discharge / stop timing, delay timing after detection, and the like may be adjusted and set based on the processing conditions. Thus, the automatic control may be sequentially performed including the timing based on the sensing result such as the temperature state.

  Further, the cleaning power may be further improved by adding ultrasonic waves to the strong alkaline ionized water 4 ejected from the nozzle portion 3 by using an ultrasonic generator to inject pulsating water.

  It should be noted that the present invention is not limited to this actual turning example, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Tool for turning 2 Cutting edge part 3 Nozzle part 4 Water for cooling (alkali ion water, strong alkali ion water)
5 NC control part 6 Work piece 7 Tool post 8 Water injection drive part

Claims (7)

For turning in NC lathes where water for cooling is injected into the cutting edge part from the nozzle part arranged toward the cutting edge part of the turning tool, and the cutting edge part is cooled by vaporization by the heat generated during the turning process. A cooling method for a tool, wherein the cooling water is alkali ion water, and the amount of water injection is a sufficient amount of water that is vaporized by the processing heat and causes a cooling action by the heat of vaporization, and is excessively consumed by falling water without being vaporized. Turning control in the NC control unit is equipped with a water injection control mechanism that reduces the amount of water to be injected and automatically controls the water injection amount according to the turning conditions, or automatically controls the turning tool with respect to the workpiece. Based on NC information that can be acquired when starting or when turning is stopped, or when turning is started when the turning tool is in contact with the workpiece or when turning is separated And controlling the opening and closing valve and the water injection drive unit for controlling the water injection operation from the nozzle based on the detection of the water injection ON · OFF for detecting unit for detecting a time, it controls the ON · OFF of water injection, the water injection drive The water injection control mechanism is configured to control the pump operation of the part or the opening / closing degree of the on-off valve, and to always inject the appropriate water injection amount from the nozzle part toward the turning tool at the time of turning, from the nozzle part towards the cutting edge portion, in the NC lathe, which comprises ejecting a small amount of the alkali ion water injection timing and injection time of the flow rate in the spot is set to the proper water injection amount is controlled, during turning Cooling method for turning tools. The water injection control mechanism that automatically adjusts the water injection amount to the appropriate water injection amount in advance or sequentially controls when processing and also has an ON / OFF control of the water injection includes an NC control unit that controls the movement of the turning tool relative to the workpiece. and configuration used, based on the cutting feed command is a NC information output from the NC controller, water injection from the previous SL said nozzle portion during immediately before or simultaneously with or immediately after cutting feed to the work of turning tool Water injection ON / OFF control signal for switching injection / stop of water injection so as to stop water injection immediately before, simultaneously with, or immediately after completion of cutting feed, and a water injection amount control signal for determining the water injection amount 2 is output from the NC control unit to control the water injection operation from the nozzle unit, and the cooling of the turning tool in the NC lathe according to claim 1 Method. Wherein the tool rest to be moved controlled by the NC controller freely provided removably the turning tool is provided towards the nozzle portion the cutting edge portion of the turning tool, for injecting the ionized alkaline water from the nozzle unit The cooling method for a turning tool in an NC lathe according to claim 2, wherein the water injection drive unit is controlled by the control signal output from the NC control unit.   The ON / OFF detection unit is configured to detect whether or not the turning tool is in contact with a workpiece by detecting a load on a spindle of the turning tool. The cooling method of the tool for turning in the NC lathe of any one of Claims.   The method for cooling a turning tool in an NC lathe according to any one of claims 1 to 4, wherein the alkaline ionized water is strong alkaline ionized water having a cleaning power of PH 12 or more.   The method for cooling a turning tool in an NC lathe according to any one of claims 1 to 5, wherein ultrasonic waves are added to the strong alkaline ionized water to pulsate water. The nozzle part is arranged toward the cutting edge part of the turning tool, the cooling water is jetted from the nozzle part to the cutting edge part, and it is vaporized by the processing heat generated during turning, and the cutting edge part is cooled by this heat of vaporization. An NC lathe equipped with a cooling mechanism for a tool for use, wherein the cooling water is alkaline ionized water, and the water injection amount is vaporized by the processing heat and is not vaporized with a sufficient water injection amount that causes a cooling action by the heat of vaporization. The cooling mechanism is configured with a water injection control mechanism that makes an appropriate water injection amount with a small excess amount consumed by falling water, and the water injection amount is set in advance according to the turning conditions or automatically controlled at the time of machining. Based on the NC information that can be acquired at the time of turning start or stop at the NC control unit that controls the movement of the tool with respect to the work, or the turning tool is attached to the work Touch the turning start or away was based on detection of the detecting section for water injection ON · OFF to detect a time turning stop by controlling the opening and closing valve and the water injection drive unit for controlling the water injection operation from the nozzle portion, ON water injection -Controlling OFF and controlling the pump operation of the water injection drive unit or the opening / closing degree of the open / close valve, and the water injection control so that the appropriate water injection amount is always injected from the nozzle unit toward the turning tool during the turning process. constitute a mechanism, toward the cutting edge portion from the nozzle portion, a small amount of the alkali ion water injection timing and injection time of the flow rate in the spot is set to the proper water injection amount is controlled, during turning An NC lathe equipped with a cooling mechanism for a turning tool, characterized by being configured to eject.

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