Cutting oil supply device

Abstract

To provide a device capable of timely replenishing a cutting agent of desired quality to a tank attached to a machine tool. [Solution] A cutting oil supply device is configured which is equipped with an inlet passage 1 for introducing a water-soluble cutting oil agent, which is the original cutting oil solution, an inlet passage 2 for introducing dilution water for diluting the original cutting oil, an inlet passage 3 for introducing alkaline water for mixing to adjust the pH of the cutting oil, a mixing and stirring tank 4 which receives the original cutting oil, the dilution water and the alkaline water and stirs and mixes them, a supply passage 5 for sending the cutting oil obtained by mixing the original cutting oil, the dilution water and the alkaline water in the mixing and stirring tank 4 to a tank 6, and a controller for increasing or decreasing the flow rate of the original cutting oil, the dilution water, the alkaline water and the cutting oil so that the storage amount, concentration and pH of the cutting oil stored in the tank 6 fall within their respective target ranges.

Description

[Technical field]

[0001] The present invention relates to an apparatus for supplying cutting oil (or cutting fluid, coolant) to a tank that stores the cutting oil used in a machine tool. [Background technology]

[0002] In machine tools, which use tools to cut and grind a workpiece to remove unnecessary parts and create the required shape, it is common to spray cutting oil between the workpiece and the tool to lubricate it, wash away sludge (cuttings and shavings), and cool the processing points that generate heat.

[0003] There are water-soluble and water-insoluble cutting oils. Water-insoluble cutting oils can be used as is without dilution (so-called straight oil), but there is a risk of fire. Water-soluble cutting oils are used by diluting the original oil with water. Compared to water-insoluble cutting oils, they are less likely to catch fire and have a high cooling effect, making them suitable for high-speed machining using machining centers and turning centers. Water-soluble cutting oils are classified into emulsions (containing water, oil, and surfactants. A milky white liquid with large oil particles. Highly versatile), soluble (containing water, oil, surfactants, and soluble substances. A translucent liquid with small oil particles. Excellent cooling and penetration properties), and solutions (containing water and soluble substances. A green liquid with very small oil particles. Excellent cooling and durability properties).

[0004] In order to maintain the proper machining operation of the machine tool and keep the machining accuracy high, it is necessary to constantly adjust the concentration of the cutting oil within a desired range. However, the concentration of the cutting oil stored in the tank attached to the machine tool may fluctuate due to evaporation of water and other factors. In addition, it is also necessary to replenish the tank in a timely manner with the amount of cutting oil consumed by the machine tool itself and the amount carried away by the filter of the filtration device that filters out sludge and floating oil.

[0005] The pH of cutting oil also needs to be constantly adjusted to within a desired range. Water-soluble cutting oils have an alkaline pH of about 9 to 10 or higher, which inhibits bacterial growth. Deviations from the pH of cutting oil promote bacterial growth, and the multiplied bacteria themselves acidify the pH of the cutting oil (see, for example, the prior art documents listed below). [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] "MicroCatch", [online], Konitec Co., Ltd., [searched on December 20, 2023], Internet<URL:https: / / www.konitech.kyoto.jp / ?page_id=60> Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an apparatus capable of replenishing a cutting fluid of a desired quality in a timely manner to a tank associated with a machine tool. [Means for solving the problem]

[0008] In the present invention, The relevant equipment is attached to the machine tool. A cutting oil supply system for a tank for storing cutting oil used in a machine tool, the system including: a stock solution inlet for introducing a water-soluble cutting oil agent which is a stock solution of the cutting oil; and a dilution water inlet for introducing dilution water for diluting the stock solution. an alkaline water inlet for introducing alkaline water for adjusting the pH of the cutting oil while diluting the stock solution; The raw liquid introduced through the raw liquid introduction passage 、 Dilution water introduced through the dilution water inlet and alkaline water introduced through the alkaline water inlet passage. Accepting these raw materials 、 Dilution Water and alkaline water A mixing and stirring tank equipped with an agitator for agitating and mixing the raw solution in the mixing and stirring tank 、 The dilution water and the alkaline water a cutting oil supply passage for delivering the cutting oil obtained by mixing the above to the tank; a return flow path for returning the filtered cutting oil from a filtering device that filters the cutting oil stored in the tank to the tank, and a cutting oil return path for returning the filtered cutting oil from the filtering device to the mixing and stirring tank;A level sensor attached to the tank 、 Concentration Sensor and pH sensor The current amount of cutting oil stored in the tank 、 concentration and pH and determining a flow rate of the raw liquid flowing through the raw liquid inlet passage and a flow rate of the dilution water flowing through the dilution water inlet passage so that the amount and concentration of the cutting oil stored in the tank are within the respective target ranges. 、 A flow rate of cutting oil flowing through the cutting oil supply passage , the flow rate of cutting oil flowing through the return path and the flow rate of cutting oil flowing through the cutting oil return path The cutting oil supplying device is provided with a controller that performs control to increase or decrease the cutting oil.

[0009] The present invention also provides a cutting oil supplying device for a tank for storing cutting oil that is attached to a machine tool and used with the machine tool, the cutting oil supplying device comprising: a stock solution inlet passage for introducing a water-soluble cutting oil agent which is a stock solution of the cutting oil; a dilution water inlet passage for introducing dilution water for diluting the stock solution; an alkaline water inlet passage for introducing alkaline water for adjusting the pH of the cutting oil while diluting the stock solution; a mixing and stirring tank having an agitator for receiving the stock solution introduced through the stock solution inlet passage, the dilution water introduced through the dilution water inlet passage, and the alkaline water introduced through the alkaline water inlet passage and for agitating and mixing the stock solution, the dilution water, and the alkaline water; A cutting oil supplying device is configured which includes a cutting oil supplying path that sends cutting oil obtained by mixing dilution water and the alkaline water toward the tank, a circulation path that branches off from the cutting oil supplying path and returns to the mixing and stirring tank, and a controller that obtains the current amount, concentration and pH of the cutting oil stored in the tank via a level sensor, a concentration sensor and a pH sensor attached to the tank, and controls to increase or decrease the flow rate of the raw material flowing through the raw material inlet path, the flow rate of dilution water flowing through the dilution water inlet path, the flow rate of cutting oil flowing through the cutting oil supply path and the flow rate of cutting oil flowing through the circulation path so that the amount and concentration of the cutting oil stored in the tank fall within their respective target ranges. This cutting oil supplying device may include a reflux path for refluxing the filtered cutting oil from a filtering device that filters the cutting oil stored in the tank toward the tank, and a cutting oil return path for returning the filtered cutting oil from the filtering device toward the mixing and stirring tank, and the controller may increase or decrease the flow rate of the cutting oil flowing through the reflux path and the flow rate of the cutting oil flowing through the cutting oil return path during the control. .

[0010] The controller may obtain the current concentration and pH of the cutting oil in the mixing / agitation tank via a concentration sensor and a pH sensor attached to the mixing / agitation tank, and then perform the control. . Effect of the Invention

[0012] According to the present invention, it is possible to realize a supply device that can timely replenish a cutting fluid of a desired quality to a tank attached to a machine tool. [Brief description of the drawings]

[0013] [Figure 1] 1 is a hydraulic circuit diagram showing a configuration of a cutting oil supplying device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram conceptually showing a configuration of a controller of the cutting oil supplying device of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An embodiment of the present invention will be described with reference to the drawings. The cutting oil supplying device of this embodiment is capable of automatically supplying the required amount of cutting oil used in machining centers, turning centers, and various other machine tools when required.

[0015] 1 and 2 show the configuration of the cutting oil supplying device of this embodiment. This supplying device is equipped with a stock solution inlet 1 for introducing a water-soluble cutting oil agent, which is a stock solution of cutting oil, a dilution water inlet 2 for introducing dilution water for diluting the stock solution, an alkaline water inlet 3 for introducing alkaline water for mixing to adjust the pH of the cutting oil, a mixing and stirring tank 4 for receiving the stock solution introduced through the stock solution inlet 1, the dilution water introduced through the dilution water inlet 2, and the alkaline water introduced through the alkaline water inlet 3, a cutting oil supplying passage 5 for sending the cutting oil obtained by mixing the stock solution, the dilution water, and the alkaline water in the mixing and stirring tank 4 to a tank 6 attached to the machine tool, and a controller 0 for controlling the flow rate of the stock solution flowing through the stock solution inlet 1, the flow rate of the dilution water flowing through the dilution water inlet 2, the flow rate of the alkaline water flowing through the alkaline water inlet 3, and the flow rate of the cutting oil flowing through the cutting oil supplying passage 5.

[0016] The raw liquid inlet passage 1 is a flow path for supplying raw cutting oil liquid to the mixing and stirring tank 4. A pump 12 for sucking and discharging the raw liquid from a container (which may be a drum can, a pail can, etc.) 11 for storing the raw liquid, and a valve 13 for opening and closing the raw liquid inlet passage 1 are provided on the raw liquid inlet passage 1. The valve 13 is, for example, a solenoid valve that can be switched to allow / block the flow of the raw liquid toward the mixing and stirring tank 4 via the raw liquid inlet passage 1, or can increase / decrease the opening degree to increase / decrease the flow rate of the raw liquid.

[0017] The dilution water inlet passage 2 is a flow path for supplying neutral tap water or industrial water as dilution water to the mixing and stirring tank 4, and is connected to a water supply. A valve 21 for opening and closing the dilution water inlet passage 2 is provided on the dilution water inlet passage 2. The valve 21 is, for example, a solenoid valve that can be switched to allow / block the flow of dilution water toward the mixing and stirring tank 4 via the dilution water inlet passage 2, or can increase / decrease the opening degree to increase / decrease the flow rate of dilution water.

[0018] As shown in FIG. 1, in this embodiment, a water metering tank 22 is installed downstream of the dilution water inlet passage 2. The water metering tank 22 is a tank for temporarily storing the dilution water and alkaline water to be injected into the mixing and stirring tank 4 and measuring their amounts. Basically, the dilution water and alkaline water are measured separately, but it is also possible to merge and mix them to measure their total amount. The water metering tank 22 is provided with a level sensor (or a level gauge, a level switch) 23 for detecting the amount of water currently stored in the water metering tank 22. The water stored in the water metering tank 23 is sent out to the mixing and stirring tank 4 through a water supply passage 24 at appropriate times. A pump 25 for sucking and discharging water from the water metering tank 22 and a valve 26 for opening and closing the water supply passage 24 are provided on the water supply passage 24. Valve 24 is, for example, a solenoid valve that can be switched to allow / block the flow of water toward mixer / agitator 4 via water supply channel 24, or can increase / decrease the opening to increase / decrease the flow rate of water.

[0019] The alkaline water inlet passage 3 is a flow path for supplying alkaline ionized water, electrolytic water, or purified water to the mixing and stirring tank 4. The pH of the alkaline water is about 12 to 13. This is higher than the target pH range of about 9 to 10 of cutting oil used in machine tools. As described above, in this embodiment, the alkaline water supplied through the alkaline water inlet passage 3 is once flowed into the water metering tank 22, and is measured before being supplied to the mixing and stirring tank 4. On the alkaline water inlet passage 3, there are provided a pump 32 that sucks and discharges alkaline water from an alkaline water tank 31 that stores alkaline water, and a valve 33 that opens and closes the alkaline water inlet passage 3. The valve 33 is, for example, a solenoid valve that can be switched to allow / block the flow of alkaline water toward the mixing and stirring tank 4 via the alkaline water inlet passage 3, or can increase / decrease the opening degree to increase / decrease the flow rate of alkaline water. Downstream of it, there is the water metering tank 22. The water supply passage 24 connecting the water metering tank 22 and the mixing / stirring tank 4 constitutes a part of the dilution water inlet passage 2 and also constitutes a part of the alkaline water inlet passage 3 .

[0020] The mixing and stirring tank 4 receives the stock solution from the stock solution inlet passage 1, and the dilution water and alkaline water from the water supply passage 24, and mixes them to prepare cutting oil to be supplied to the tank 6 of the machine tool. The mixing and stirring tank 4 is equipped with an agitator 41 that uses a motor to rotate an agitating blade disposed in the tank. The mixing and stirring tank 4 is also equipped with a concentration sensor (or concentration meter) 42 for detecting the stock solution concentration of the cutting oil currently stored in the mixing and stirring tank 4, and a pH sensor (or pH meter, hydrogen ion measuring device) 43 for detecting the pH of the cutting oil.

[0021] The cutting oil supply path 5 is a flow path for supplying the cutting oil prepared in the mixing and stirring tank 4 to the tank 6 of the machine tool. A pump 51 for sucking and discharging the cutting oil from the mixing and stirring tank 4 in which the cutting oil is stored, and a valve 52 for opening and closing the cutting oil supply path 5 are provided on the cutting oil supply path 5. The valve 52 is, for example, a solenoid valve that can be switched to allow / block the flow of cutting oil toward the tank 6 via the cutting oil supply path 5, or can increase / decrease the opening degree to increase / decrease the flow rate of cutting oil.

[0022] A circulation path 53 that returns to the mixing and stirring tank 4 branches off from a point downstream of the pump 51 and upstream of the valve 52 in the cutting oil supply path 5, and a valve 54 is provided on the circulation path 53 to open and close it. The valve 54 is, for example, a solenoid valve that can be switched to allow / block the flow of cutting oil toward the mixing and stirring tank 4 via the circulation path 53, or can increase / decrease the opening degree to increase / decrease the flow rate of cutting oil. If the valve 52 is closed and the valve 53 is opened while the pump 51 is operating, the cutting oil in the mixing and stirring tank 4 can be circulated through the circulation path 53. This can be used to further increase the degree of mixing of the original solution, the dilution water, and the alkaline water, and to eliminate unevenness in the components.

[0023] The cutting oil supplied to the tank 6 through the cutting oil supply passage 5 is stored in the tank 6 and is sent to the machine tool through a flow passage 64 when necessary. The cutting oil is sprayed between the workpiece and the tool in the machine tool to be used for lubrication, cleaning and removing sludge, and cooling the machining points that generate heat. A pump 65 is provided on the flow passage 64 to suck and discharge the cutting oil from the tank 6. The cutting oil used in the machine tool is collected and returned to the tank 6 through a return flow passage 66. The tank 6 is provided with a concentration sensor 61 for detecting the concentration of the raw cutting oil currently stored in the tank 6, a pH sensor 62 for detecting the pH of the cutting oil, and a level sensor 63 for detecting the amount of cutting oil currently stored.

[0024] Cutting oil that is collected after use in a machine tool is contaminated with sludge and floating oil generated during the processing. The filter device 7 filters the cutting oil with a filter and works to remove sludge and floating oil from the cutting oil. For example, the filter device 7 is one disclosed in Japanese Patent Publication No. 2021-109115 (Patent No. 6934262). A pump 72 that sucks and discharges cutting oil from the tank 6 is provided on a flow path 71 connecting the tank 6 and the filter device 7. The cutting oil that is sent to the filter device 7 through the flow path 71 and filtered in the filter device 7 is returned to the tank 6 through a return path 73. A pump 74 that sucks and discharges cutting oil from the filter device 7 is provided on the return path 73.

[0025] 1, it is also possible to provide a cutting oil return path 75 that branches off from a point downstream of the pump 74 in the return path 73 and leads to the mixing and stirring tank 4, and to return the filtered cutting oil to the mixing and stirring tank 4. Switching between the paths 73, 75 into which the filtered cutting oil is to flow is performed, for example, via an air-operated three-port valve 76. The cutting oil return path 75 can be used to reduce the amount of cutting oil stored in the tank 6 of the machine tool.

[0026] The controller 0 that controls the cutting oil supplying device of this embodiment is a microcomputer system, a personal computer, a workstation, a programmable controller, or the like that has a processor, a main memory and an auxiliary storage device (e.g., a flash memory, a hard disk drive, or the like) that are storage devices, an input / output interface, etc. The controller 0 loads a program that is stored in advance in the auxiliary storage device into the processor via the memory, and decodes the program in the processor to control the cutting oil supplying device.

[0027] As shown in Figure 2, the input interface of controller 0 has: A signal output from a level sensor 23 that detects the amount of water (dilution water, alkaline water) in the water measuring tank 22 A signal output from the concentration sensor 42 that detects the concentration of the raw cutting oil contained in the mixing and stirring tank 4 Signal output from the pH sensor 43 that detects the pH of the cutting oil in the mixing / agitation tank 4 A signal output from a concentration sensor 61 that detects the concentration of the raw cutting oil contained in the tank 6 of the machine tool A signal output from a pH sensor 62 that detects the pH of cutting oil in the tank 6 of the machine tool A signal output from a level sensor 63 that detects the amount of cutting oil stored in the tank 6 of the machine tool etc. are entered.

[0028] The output interface of controller 0 is A signal to control the discharge flow rate (or pump output) of the raw liquid by the pump 12 on the raw liquid introduction path 1 A signal to control the opening of the valve 13 on the raw liquid introduction path 1 A signal to control the opening of the valve 21 on the dilution water inlet 2 A signal for controlling the discharge flow rate of alkaline water by the pump 32 on the alkaline water inlet line 3 A signal for controlling the opening of the valve 33 on the alkali introduction path 3 A signal for controlling the discharge flow rate of water (diluted water, alkaline water) by the pump 25 on the water supply line 24 A signal to control the opening of the valve 26 on the water supply line 24 A signal for controlling the rotation speed (or motor output) of the motor (and thus the stirring blade) of the stirrer 41 of the mixing / stirring tank 4 A signal for controlling the discharge flow rate of cutting oil by the pump 51 on the cutting oil supply path 5 A signal for controlling the opening of the valve 52 on the cutting oil supply path 5 A signal to control the opening of the valve 53 on the cutting oil circulation path 53 A signal for controlling the discharge flow rate of cutting oil by the pump 72 on the flow path 71 A signal for controlling the discharge flow rate of cutting oil by the pump 74 on the return path 73 A signal to control the valve 76 that switches between flowing the filtered cutting oil to the return path 73 or the return path 75 etc.

[0029] The controller 0 refers to various signals given via the input interface to particularly know the current amount of cutting oil stored in the tank 6, the concentration and pH of the cutting oil. Then, signals for controlling the discharge flow rate of each pump 12, 25, 32, 51, 72, 74 and / or the state of each valve 13, 21, 26, 33, 52, 76 are given to the pumps 12, 25, 32, 51, 72, 74 and the valves 13, 21, 26, 33, 52, 76 via the output interface so that the amount of cutting oil stored in the tank 6, the concentration and pH of the cutting oil fall within their respective target ranges.

[0030] As a specific example, when the amount of cutting oil stored in the tank 6 falls below the target range (lower limit value), the cutting oil prepared in the mixing and stirring tank 4 is replenished to the tank 6 through the cutting oil supply path 5. At this time, the controller 0 automatically operates the pump 51 and opens the valve 52. When the amount of cutting oil stored in the tank 6 increases and recovers to the target range (or a predetermined target value), the pump 51 is stopped and the valve 52 is closed.

[0031] Of course, the cutting oil to be supplied to the tank 6 must be present in the mixing and stirring tank 4 beforehand. To this end, the controller 0 injects diluting water into the water metering tank 22 by opening the valve 21 on the diluting water inlet line 2, and injects alkaline water into the water metering tank 22 by opening the valve 33 while operating the pump 32 on the alkaline water inlet line 3. Furthermore, the controller 0 operates the pump 25 on the water supply line 24 and opens the valve 26 to supply the diluting water and alkaline water in the water metering tank 22 to the mixing and stirring tank 4. On the other hand, the controller 0 operates the pump 12 on the stock solution inlet line 1 and opens the valve 13 to supply the stock solution of cutting oil to the mixing and stirring tank 4. Then, the stock solution, diluting water, and alkaline water are stirred and mixed in the mixing and stirring tank 4 to automatically prepare cutting oil.

[0032] In principle, the concentration of the stock solution contained in the cutting oil in the mixing and stirring tank 4 is kept within the target range of the concentration of the cutting oil used in the machine tool. The controller 0 adjusts the concentration of the cutting oil by increasing or decreasing the amount of stock solution supplied to the mixing and stirring tank 4 relative to the amount of dilution water and alkaline water injected into the mixing and stirring tank 4. However, if the concentration of the cutting oil currently stored in the tank 6 deviates from the target range, the concentration of the cutting oil prepared in the mixing and stirring tank 4 and supplied to the tank 6 may be made higher or lower than the target range. That is, when the concentration of the cutting oil stored in the tank 6 is lower than the target range, the controller 0 can prepare cutting oil in the mixing and stirring tank 4 with a higher concentration of stock solution than the target range and supply it to the tank 6. Conversely, when the concentration of the cutting oil stored in the tank 6 is higher than the target range, the controller 0 can prepare cutting oil in the mixing and stirring tank 4 with a lower concentration of stock solution than the target range and supply it to the tank 6. As a result, it is possible to constantly maintain the concentration of the cutting oil in the tank 6 within the target range.

[0033] The pH of the cutting oil in the mixing and stirring tank 4 is also, in principle, kept within the target pH range of the cutting oil used in the machine tool. The controller 0 adjusts the pH of the cutting oil by increasing or decreasing the amount of alkaline water injected into the mixing and stirring tank 4 relative to the amount of dilution water injected into the mixing and stirring tank 4. However, if the pH of the cutting oil currently stored in the tank 6 deviates from the target range, the pH of the cutting oil prepared in the mixing and stirring tank 4 and supplied to the tank 6 may be made higher or lower than the target range. That is, when the pH of the cutting oil stored in the tank 6 is lower than the target range, the controller 0 can prepare cutting oil with a higher pH than the target range in the mixing and stirring tank 4 and supply it to the tank 6. Conversely, when the pH of the cutting oil stored in the tank 6 is higher than the target range, the controller 0 can prepare cutting oil with a lower pH than the target range in the mixing and stirring tank 4 and supply it to the tank 6. As a result, the pH of the cutting oil in the tank 6 can be constantly maintained within the target range.

[0034] If the concentration and / or pH of the cutting oil in the tank 6 deviates from the target range, and if a large amount of cutting oil is already stored in the tank 6, the controller 0 operates the pumps 72 and 74 attached to the filter device 7 and switches the valve 76 in a direction to allow the cutting oil that has passed through the filter device 7 to flow into the return line 75, thereby returning at least a part of the cutting oil in the tank 6 to the mixing and stirring tank 4, thereby increasing the free capacity of the tank 6. Then, cutting oil adjusted to the required concentration and pH is prepared in the mixing and stirring tank 4 and supplied to the tank 6. In this way, the concentration and pH of the cutting oil in the tank 6 can be converged to their respective target ranges.

[0035] Incidentally, the procedure for preparing cutting oil in the mixing and stirring tank 4 is preferably to first inject water adjusted to a desired pH by mixing dilution water and alkaline water into the mixing and stirring tank 4 (the controller 0 can know the pH of the water via a pH sensor 43 installed in the mixing and stirring tank 4, but a pH sensor may be installed in the water metering tank 22 and the pH of the water may be known via the pH sensor), and then inject the undiluted cutting oil solution into the mixing and stirring tank 4. In other words, the undiluted solution is added to the water whose pH has been adjusted. If water is added to the undiluted solution in the opposite procedure, there is a possibility that the undiluted solution and the water will not be mixed sufficiently.

[0036] In this embodiment, cutting oil is supplied to a tank 6 that stores cutting oil used in a machine tool, and includes a stock solution inlet passage 1 for introducing a water-soluble cutting oil agent, which is a stock solution of the cutting oil, a dilution water inlet passage 2 for introducing dilution water for diluting the stock solution, a mixing and stirring tank 4 equipped with an agitator 41 that receives the stock solution introduced through the stock solution inlet passage 1 and the dilution water introduced through the dilution water inlet passage 2 and agitates and mixes the stock solution and the dilution water, a cutting oil supply passage 5 for sending the cutting oil obtained by mixing the stock solution and the dilution water in the mixing and stirring tank 4 toward the tank 6, and a cutting oil supply passage 6 for supplying the cutting oil to the tank 6. The cutting oil supplying device includes a controller 0 which performs feedback control to increase or decrease the flow rate of the stock solution flowing through the stock solution inlet passage 1, the flow rate of the dilution water flowing through the dilution water inlet passage 2, and the flow rate of the cutting oil flowing through the cutting oil supply passage 5 so that the storage amount and concentration of the cutting oil stored in the tank 6 are within their respective target ranges. According to this embodiment, the required amount of cutting oil can be automatically supplied to the tank 6 of the machine tool, and the concentration of the cutting oil in the tank 6 can be automatically adjusted.

[0037] In this embodiment, the cutting oil is supplied to a tank 6 for storing cutting oil used in a machine tool, and includes a stock solution inlet 1 for introducing a water-soluble cutting oil agent, which is a stock solution of the cutting oil, an alkaline water inlet 3 for introducing alkaline water for adjusting the pH of the cutting oil while diluting the stock solution, a mixing and stirring tank 4 having an agitator 41 for receiving the stock solution introduced through the stock solution inlet 1 and the alkaline water introduced through the alkaline water inlet 3 and for agitating and mixing the stock solution and the alkaline water, and a cutting oil supply device for supplying the cutting oil obtained by mixing the stock solution and the alkaline water in the mixing and stirring tank 4 toward the tank 6. The cutting oil supplying device includes a cutting oil supplying passage 5, and a controller 0 which performs feedback control to increase or decrease the flow rate of the stock solution flowing through the stock solution inlet passage 1, the flow rate of the alkaline water flowing through the alkaline water inlet passage 3, and the flow rate of the cutting oil flowing through the cutting oil supplying passage 5, and obtains the current amount and pH of the cutting oil stored in the tank 6 through a level sensor 63 and a pH sensor 62 attached to the tank 6, obtains the current pH of the cutting oil in the mixing and stirring tank 4 through a pH sensor 43 attached to the mixing and stirring tank 4, so that the amount and pH of the cutting oil stored in the tank 6 are within their respective target ranges. According to this embodiment, the required amount of cutting oil can be automatically supplied to the tank 6 of the machine tool, and the pH of the cutting oil in the tank 6 can be automatically adjusted.

[0038] The present invention is not limited to the embodiment described above in detail, and the specific configuration of each part can be modified in various ways without departing from the spirit of the present invention. [Explanation of symbols]

[0039] 0...Controller 1…Stock solution introduction path 2…Dilution water inlet 3...Alkaline water inlet 4…Mixing stirring tank 41...Agitator 5…Cutting oil supply path 6...Tanks attached to machine tools 7...filtration device 75…Cutting oil return path

Claims

1. A device for supplying cutting oil to a tank that is attached to a machine tool and that stores cutting oil used in the machine tool, A stock solution introduction passage for introducing a water-soluble cutting oil agent which is a stock solution of the cutting oil; A dilution water inlet for introducing dilution water for diluting the stock solution; an alkaline water inlet for introducing alkaline water for adjusting the pH of the cutting oil while diluting the stock solution; a mixing and stirring tank including an agitator for receiving the stock solution introduced through the stock solution inlet passage, the dilution water introduced through the dilution water inlet passage, and the alkaline water introduced through the alkaline water inlet passage, and for agitating and mixing the stock solution, the dilution water, and the alkaline water; a cutting oil supply passage for delivering the cutting oil obtained by mixing the stock solution, the dilution water, and the alkaline water in the mixing and stirring tank toward the tank; a return flow path for returning the filtered cutting oil from a filtering device that filters the cutting oil stored in the tank to the tank; a cutting oil return passage for returning the filtered cutting oil from the filtering device to the mixing and stirring tank; a controller that obtains the current amount, concentration and pH of the cutting oil stored in the tank via a level sensor, a concentration sensor and a pH sensor attached to the tank, and controls to increase or decrease the flow rate of the raw material flowing through the raw material introduction path, the flow rate of dilution water flowing through the dilution water introduction path, the flow rate of cutting oil flowing through the cutting oil supply path, the flow rate of cutting oil flowing through the return path and the flow rate of cutting oil flowing through the cutting oil return path so that the amount and concentration of the cutting oil stored in the tank fall within their respective target ranges; A cutting oil supplying device comprising:

2. A device for supplying cutting oil to a tank that is attached to a machine tool and that stores cutting oil used in the machine tool, A stock solution introduction passage for introducing a water-soluble cutting oil agent which is a stock solution of the cutting oil; A dilution water inlet for introducing dilution water for diluting the stock solution; an alkaline water inlet for introducing alkaline water for adjusting the pH of the cutting oil while diluting the stock solution; a mixing and stirring tank including an agitator for receiving the stock solution introduced through the stock solution inlet passage, the dilution water introduced through the dilution water inlet passage, and the alkaline water introduced through the alkaline water inlet passage, and for agitating and mixing the stock solution, the dilution water, and the alkaline water; a cutting oil supply passage for delivering the cutting oil obtained by mixing the stock solution, the dilution water, and the alkaline water in the mixing and stirring tank toward the tank; a circulation path that branches off from the cutting oil supply path and returns to the mixing and stirring tank; a controller that obtains the current amount, concentration, and pH of the cutting oil stored in the tank via a level sensor, a concentration sensor, and a pH sensor attached to the tank, and controls to increase or decrease the flow rate of the raw material flowing through the raw material introduction path, the flow rate of dilution water flowing through the dilution water introduction path, the flow rate of cutting oil flowing through the cutting oil supply path, and the flow rate of cutting oil flowing through the circulation path so that the amount and concentration of the cutting oil stored in the tank fall within their respective target ranges; A cutting oil supplying device comprising:

3. A cutting oil supply device as described in claim 1 or 2, wherein the controller obtains information about the current concentration and pH of the cutting oil in the mixing and stirring tank via a concentration sensor and a pH sensor attached to the mixing and stirring tank, and then performs the control.

4. A return flow path for returning the filtered cutting oil from a filtering device that filters the cutting oil stored in the tank to the tank; a cutting oil return path for returning the filtered cutting oil from the filtering device to the mixing and stirring tank; Equipped with 3. The cutting oil supplying device according to claim 2, wherein the controller adjusts, in the control, the flow rate of the cutting oil flowing through the circulation path and the flow rate of the cutting oil flowing through the cutting oil return path.

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