JP2023121052A - Circulation type electrolysis coolant liquid generation system and coolant regeneration electrolytic treatment device applied to the system - Google Patents

Abstract

To efficiently regenerate and utilize a used coolant liquid by using an electrolytic treatment device.SOLUTION: A circulation type electrolysis coolant liquid generation system comprises: a coolant liquid tank which stores a used coolant liquid; an electrolytic treatment device which includes an anode tank that receives the used coolant liquid and a cathode tank that receives a diluted coolant liquid; a reutilization tank which stores the diluted coolant liquid containing an electrolysis coolant liquid subjected to the electrolytic treatment in the anode tank and water; and water feeding means which can feed the used coolant liquid to the anode tank, as well as, the diluted coolant liquid to the cathode tank. The used coolant liquid is fed to the reutilization tank after being subjected to the electrolytic treatment in the anode tank and the diluted coolant liquid is subjected to the electrolytic treatment in the cathode tank, and then, refluxed to the coolant liquid tank.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a technology for purifying coolant used in machining such as cutting and grinding, and more particularly, a circulating electrolytic coolant generation system that efficiently recycles coolant after use, and the system. It relates to an electrolytic treatment device for coolant regeneration applied to.

In a known processing apparatus for processing a work material such as a metal part, for the purpose of cooling the frictional heat generated between the processing tool and the work material, preventing rust, and maintaining lubricity, for example, a water-soluble coolant liquid or oil-based coolant may be used.

Of these, for example, water-soluble coolant liquids are used in various processing apparatuses because they have many advantages such as not excessively contaminating the workpiece and processing tools. However, even with water-soluble coolant, if it is used for a long period of time, various bacteria will grow and produce a foul odor, and the pH value and viscosity will change, resulting in a decrease in processing performance. There is also a problem that the cost is necessary from the beginning.

In order to solve such a problem, there is a technique for purifying the coolant liquid using an electrolytic treatment device capable of applying a desired voltage, as exemplified in the following patent documents.
For example, in Patent Document 1, at least a pair of a cathode and an anode electrically connected to a DC power supply are arranged in a storage tank provided in a coolant circulation path, and the electrochemical action of these cathodes and anodes causes cathode A coolant liquid purifier is shown that deposits and recovers metal ions on the surface.

On the other hand, in Patent Document 2, water obtained by electrolysis has a pH value of 8.0 or more and 13.0 or less, and/or is water-soluble using electrolytic ion water having an oxidation-reduction potential of −100 mV to −1000 mV. A technique for diluting and mixing a liquid coolant stock solution is disclosed.
Further, in the following patent document 3, a water-soluble coolant purifier equipped with recovery means for stripping or separating at least one of the substances deposited and adsorbed on the surface of the cathode plate and the anode plate and depositing it on the bottom side of the electrolytic cell. is proposed.

Japanese Patent Application Laid-Open No. 2002-011661 JP-A-2002-167594 JP 2009-166176 A

However, the conventional techniques including the above-mentioned patent documents still have the following problems, and there is much room for improvement.
That is, it is true that the purification of the coolant liquid can be achieved to some extent by utilizing the electrolytic treatment apparatus as disclosed in Patent Documents 1 to 3. However, for example, in the configurations of Patent Documents 1 and 3, since metal ions are deposited on the cathode of the electrolytic treatment apparatus, if the number of metal ions that are deposited and adhered to the surface of the cathode increases, maintenance becomes very complicated and costs a lot. I am worried that I will need it.

On the other hand, according to Patent Document 2, since it is configured to dilute and mix the water-soluble coolant undiluted solution using electrolytic ion water, the maintenance of the electrolytic treatment apparatus itself is not so complicated, but basically the coolant after use Since there is no point of view of reusing the liquid, it must be said that there is still a lot of waste.
As described above, the conventional technologies including the above-mentioned patent documents do not have any point of view of efficiently reusing the coolant liquid after use while suppressing the complexity of maintenance, and it can be said that there is much room for improvement.

The present invention has been made in view of the above problems as an example, and uses an electrolytic treatment device to efficiently recycle used coolant and to easily treat coolant water at low cost. It is an object of the present invention to provide a circulating electrolytic coolant liquid generation system capable of regenerating a coolant, and an electrolytic treatment apparatus for coolant regeneration applied to the system.

In order to solve the above problems, a circulating electrolytic coolant liquid generation system according to one embodiment of the present invention includes (1) a coolant liquid tank for storing used coolant liquid used in machining a workpiece; an electrolytic treatment apparatus comprising: an anode tank connected to a liquid tank to receive the used coolant liquid stored in the coolant tank; and a cathode tank separated from the anode tank by an ion-exchangeable diaphragm. a reuse tank connected to each of the anode tank and the cathode tank for storing a diluted coolant liquid produced by diluting the electrolytic coolant electrolyzed in the anode tank with water; and the used coolant liquid. to the anode tank and the diluted coolant water to the cathode tank, wherein the diluted coolant is electrolyzed in the cathode tank and then sent to the coolant tank. and the used coolant liquid is electrolyzed in the anode tank and then sent to the reuse tank.

In addition, in the circulating electrolytic coolant liquid generation system described in (1) above, (2) electrolysis aid addition means for adding an electrolysis aid to the diluted coolant liquid sent from the reuse tank to the cathode tank; and, preferably, the diluted coolant solution to which the electrolysis aid is added is electrolyzed in the cathode tank.

In addition, the circulating electrolytic coolant liquid generation system described in (2) above further includes (3) a control device for controlling the driving of the electrolysis device and the addition amount of the electrolysis auxiliary, wherein the control device is Preferably, the amount of the electrolysis auxiliary added to the diluted coolant liquid is adjusted according to the number of voltage applications in the electrolysis apparatus.

Further, in the circulating electrolytic coolant generation system according to any one of the above (1) to (3), (4) the used coolant that is sent from the coolant tank to the anode tank Preferably, the cooling device further includes a foreign matter removing filter that removes foreign matter by performing solid-liquid separation and oil-water separation, and the used coolant from which the foreign matter has been removed is electrolyzed in the anode tank.

Furthermore, in order to solve the above problems, an electrolysis treatment apparatus for coolant regeneration that can be applied to a circulating electrolytic coolant liquid generation system according to an embodiment of the present invention includes (5) any of the above (1) to (4) An electrolysis treatment apparatus for regenerating a coolant liquid used in the circulating electrolysis coolant liquid generation system described in (1) above, comprising an ion-exchangeable diaphragm and an anode tank for receiving the used coolant liquid stored in the coolant liquid tank. a cathode tank that is separated from the anode tank by the diaphragm and receives diluted coolant supplied from the reuse tank; an anode installed in the anode tank; and a cathode installed in the cathode tank. and a control device for applying a predetermined voltage to between and through a power supply.

Furthermore, in order to solve the above problems, a coolant recycling method according to an embodiment of the present invention includes the steps of machining a workpiece using a machining coolant, and recycling the used coolant used in the machining. a step of storing the coolant liquid in a tank; receiving the stored used coolant liquid in the anode tank of the electrolysis apparatus; receiving the liquid stored in the reuse tank in the cathode tank; a step of performing an electrolytic treatment, feeding the electrolytic coolant solution electrolyzed in the anode tank to the recycling tank, and neutralizing the alkaline water electrolyzed in the cathode tank so as to become a reused coolant solution. and feeding the used coolant liquid to the coolant liquid tank, wherein the used coolant liquid is electrolyzed and diluted with the water in the reuse tank, and the used coolant liquid diluted with the water is supplied to the cathode tank. A part of the coolant water is drained in order to prevent the coolant water from rotting while being fed.

According to the present invention, the coolant liquid after being used in machining is fed to the anode tank, while the coolant liquid electrolyzed in the anode tank is reused in the cathode tank and electrolyzed in each tank. After use, the coolant is neutralized and sterilized by passing it through the anode tank, and the pH is adjusted to be suitable as a working liquid, so that the coolant can be recycled and reused.

1 is an overall configuration diagram of a circulating electrolytic coolant liquid generation system including an electrolytic treatment device for coolant regeneration according to an embodiment; FIG. FIG. 2 is a configuration diagram schematically showing the structure around an electrolytic treatment tank included in the electrolytic treatment apparatus for coolant regeneration; FIG. 3 is a schematic diagram showing a functional block of a control device included in the coolant regeneration electrolytic treatment apparatus; 4 is a flow chart showing a coolant liquid recycling method applied to the circulation type electrolytic coolant liquid generation system in the embodiment. FIG. 2 is a configuration diagram of a circulation-type electrolytic coolant liquid generation system including an electrolytic treatment device for coolant regeneration according to Modification 1; FIG. 11 is an overall configuration diagram of a circulating electrolytic coolant liquid generation system including an electrolytic treatment device for coolant regeneration according to Modification 2;

In the following, embodiments for carrying out the present invention will be described, for example, known processing such as cutting or grinding using a known tool for removing a part of a workpiece or polishing the surface of a workpiece. A circulation-type electrolytic coolant generation system that recycles the coolant supplied to the device will be described. In addition, other than the configuration described in detail below, for example, known techniques including the above-described patent documents can be appropriately supplemented and implemented.

[Circulating Electrolytic Coolant Liquid Generation System 100]
FIG. 1 is an overall configuration diagram of a circulating electrolytic coolant liquid generating system 100 according to this embodiment. That is, the circulating electrolytic coolant liquid generation system 100 is installed accompanying a processing apparatus that processes a workpiece using the coolant liquid described above, and includes a coolant liquid tank 10, an electrolytic treatment device 20, a reuse tank 30, and a water supply. It comprises a means 40 and a control device 60 . As will be described later, the circulating electrolytic coolant liquid generating system 100 of the present embodiment may further include at least one of the electrolytic auxiliary agent adding means 50 and the foreign matter removing filter FT.

As the suitable "work material" in the present embodiment, various known works, such as metals and ceramics, which are preferably processed through a coolant liquid, can be applied.
In addition, as a suitable "processing device" in the present embodiment, for example, a grinding device for grinding the above-described work, a cutting device for cutting the above-described work, or a polishing device for polishing the above-described work, etc. Various well-known processing apparatuses for processing a work by pressing can be applied.
Furthermore, as the "coolant liquid" suitable for the present embodiment, for example, various known water-soluble coolant liquids and oil-based coolant liquids used in the above-described processing equipment to ensure cooling, lubrication, rust prevention, etc. of the work during processing. An (emulsion) coolant liquid can be exemplified.

The coolant liquid tank 10 is a well-known container that stores at least the used coolant liquid CL1 used in the machining of the workpiece in the above-described machining apparatus. As shown in FIG. 1, it is preferable that the coolant liquid tank 10 is provided with a known pH sensor S1 capable of detecting the pH value of the stored coolant liquid.
In this embodiment, the used coolant CL1 (described later) used during processing is fed from the processing apparatus to the coolant liquid tank 10 via water feeding means (not shown) such as, for example, known pipes and pumps. is configured as

The coolant liquid tank 10 is also connected to an anode tank 22 of an electrolytic treatment device 20, which will be described later, via a second water pipe 42 and a second pump P2. As a result, under the control of the control device 60, which will be described later, it is possible to feed the used coolant CL1 that has been used in processing in the processing device into the anode tank 22. FIG.
As shown in the figure, the circulating electrolytic coolant generation system 100 of the present embodiment removes foreign matter from the used coolant CL1 that is fed from the coolant tank 10 to the anode tank 22 of the electrolysis device 20. It is preferable to further include a foreign matter removal filter FT that Such a foreign matter removing filter FT can be exemplified by a known mesh member such as a metal mesh or a ceramic mesh, and is provided in the second water pipe 42 described above. As a result, foreign matter (oil, sludge, etc.) generated during machining such as cutting chips is removed by the foreign matter removal filter FT, and the after-use coolant CL1 separated from solid-liquid and oil-water is electrolytically treated in the anode tank 22.

The coolant liquid tank 10 is also connected to the cathode tank 23 of the electrolytic treatment device 20 via the third water pipe 43 and the third pump P3. As a result, it is possible to feed the regenerated coolant CL<b>4 (described later) electrolyzed by the electrolytic treatment device 20 into the coolant liquid tank 10 . Note that the third pump P3 is not essential and may be omitted as appropriate.
In addition, the circulation type electrolytic coolant liquid generation system 100 of the present embodiment detects the pH value of the regenerated coolant liquid CL4 electrolyzed in the cathode tank 23 with the pH sensor S1, and the pH value of the coolant liquid CL4 installed in the coolant liquid tank 10 is detected. It is preferable to drive the electrolysis device 20 according to the pH value detected by the sensor S1. The pH sensor S1 is provided in the coolant liquid tank 10 as well as in the third water pipe 43 described above, for example.
As an example of use using the pH sensor S1, it is possible to detect the pH value with the pH sensor S1 and control whether or not the above-described electrolytic processing apparatus 20 operates. As an example, the electrolysis device 20 may be operated when the pH value is lower than a predetermined threshold value, while the electrolysis device 20 may be stopped when the pH value is higher than the threshold value.

The electrolytic treatment apparatus 20 is connected to the coolant liquid tank 10 described above, and has an anode tank 22 that receives the used coolant CL1 stored in the coolant liquid tank 10, and an ion-exchangeable diaphragm 24 that is connected to the anode tank 22. , and a cathode cell 23 that is divided into . More specifically, as shown in FIG. 2, the electrolytic treatment apparatus 20 includes an electrolytic cell 21 in which the above-described anode cell 22 and cathode cell 23 are separated by a diaphragm 24 . The anode tank 22 of the electrolytic tank 21 is provided with an anode 22a made of a known electrode, and the cathode tank 23 is likewise provided with a cathode 23a made of a known electrode. These anode 22a and cathode 23a are electrically connected to a known commercial power supply E, and a desired voltage is applied between these electrodes under the control of a controller 60, which will be described later.

Further, the electrolytic treatment apparatus 20 of the present embodiment is connected to a water feeding means 40 for feeding the used coolant CL and the diluted coolant CL3 to respective target tanks. More specifically, as understood from FIG. 2, the after-use coolant CL1 is fed from the coolant liquid tank 10 to the anode tank 22 of the electrolytic treatment device 20 through the second water pipe 42, and the anode The electrolytic coolant CL2 electrolyzed in the tank 22 is sent from the anode tank 22 to the reuse tank 30 through the fourth water pipe 44 . On the other hand, the diluted coolant liquid CL3 is fed to the cathode tank 23 of the electrolytic treatment device 20 from a reuse tank 30, which will be described later, via the first water pipe 41 and the first pump P1. Further, the regenerated coolant CL4 electrolyzed in the cathode tank 23 is sent from the cathode tank 23 to the coolant tank 10 via the third water pipe 43 and the third pump P3.

The reuse tank 30 is connected to the anode tank 22 and the cathode tank 23, respectively, and has a function of storing the diluted coolant CL3 generated by diluting the electrolytic coolant CL2 electrolyzed in the anode tank 22 with water. is configured with Such a reusable tank 30 is not particularly limited as long as it exhibits the above functions, and for example, various known containers similar to the coolant liquid tank 10 can be applied. Note that the reuse tank 30 may be provided with a known sensor S2 capable of detecting the temperature and conductivity of the stored liquid and a known temperature control device (not shown) such as a heater. As a result, the control device 60 can control the temperature of the diluted coolant CL3 stored in the reuse tank 30 to an appropriate temperature before feeding the diluted coolant to the anode tank 22 .

Further, as shown in FIG. 1, the reuse tank 30 is connected to a known water source 31 via a known water pipe. As a result, water from the water source 31 can be received by the reuse tank 30 as needed. Examples of such a water source 31 include ground water such as well-known tap water and well water, as well as known commercially available water such as industrial water.
Further, as can be understood from the figure, the reuse tank 30 is configured with a discharge pipe 32 connected to a known drainage location DP such as a river, groundwater, or sewage system. Also, the discharge pipe 32 is provided with a well-known drainage adjustment valve 33 , and the liquid in the tank can be drained via the drainage adjustment valve 33 by the control device 60 . As will be described later, in this embodiment, since the coolant liquid after use is neutralized by electrolytic treatment, it is possible to drain the liquid in the tank to the drainage place DP without the need to treat the liquid in the tank with chemicals or the like. there is In addition, if the liquid remains in the reuse tank 30 for a relatively long period of time, it may rot. is important.
As an example of waste water treatment by the control device 60 based on such a waste water adjustment valve 33, based on the conductivity of the liquid in the reuse tank 30 and the integrated value of the electrolytic treatment time in the electrolytic tank 21, these values can be exemplified by automatically opening the drainage adjustment valve 33 and performing drainage treatment when the water discharge exceeds a predetermined value or a predetermined time. At this time, a known water level sensor (not shown) may be provided in the reuse tank 30, and the liquid in the tank may be drained through the discharge pipe 32 until the water level in the reuse tank 30 reaches a constant level.

The water supply means 40 is configured to have a function to supply the used coolant CL to the anode tank 22 and to supply the diluted coolant CL3 to the cathode tank 23 . The water supply means 40 of this embodiment includes the above-described first water pipe 41 and first pump P1, second water pipe 42 and second pump P2, and third water pipe 43 and third pump, each having a known structure. P3, and a fourth water pipe 44 and a fourth pump P4. In addition, in the water supply means 40 of this embodiment, as long as the above functions are exhibited, for example, one of the above pumps may be omitted. Also, the fourth pump P4 is not essential and may be omitted as appropriate.

The electrolytic auxiliary agent adding means 50 is configured to have a function of adding a known electrolytic auxiliary agent to the diluted coolant CL3 that is fed from the reuse tank 30 to the cathode tank 23 .
Such an electrolysis aid can be used to reduce the electrical conductivity of the solution passing through the electrolysis apparatus 20 and to generate a solution having a pH value that does not excessively consume the power required for electrolysis. can. Moreover, such electrolysis auxiliary is preferably a component that does not generate corrosive substances.
When the circulating electrolytic coolant liquid generating system 100 is provided with the electrolytic auxiliary agent adding means 50 , the diluted coolant liquid CL 3 to which the electrolytic auxiliary agent is added is electrolyzed in the cathode tank 23 . As the electrolysis aid of the present embodiment, for example, an aqueous solution in which potassium carbonate (K ₂ CO ₃ ) or calcium carbonate (CaCO ₃ ) is dissolved in an amount of about 0.01 to 1.0% can be exemplified. Various known electrolysis aids may be used as long as they satisfy the requirements.

More specifically, as shown in FIG. 1, the electrolysis auxiliary agent adding means 50 includes an auxiliary agent storage tank 51 that stores the electrolysis auxiliary agent, and an electrolysis agent that is connected to the first water pipe 41 and stored in this tank. A known piping 52 for sending the auxiliary agent, a valve 53 having a known structure for adjusting the amount of the electrolytic auxiliary agent to be added to the diluted coolant CL3, and a fifth pump P5 having a known structure. It is configured.
The control device 60 described above preferably has a function of controlling the amount of addition of this electrolysis aid. As a result, the controller 60 can adjust the addition amount of the electrolysis aid to the diluted coolant CL3 according to the number of voltage applications in the electrolysis device 20 described above.

The control device 60 is configured to have a function of integrally controlling the operations of the electrolytic treatment device 20, the water feeding means 40, and the like. As shown in FIG. 3, such a control device 60 can be exemplified by a known computer having a known storage device MD (for example, memory MR, hard disk HD, solid state drive SSD, etc.) and arithmetic device CPU.
In the circulating electrolytic coolant liquid generation system 100 in this embodiment, under the control of the control device 60, the diluted coolant liquid CL3 is electrolyzed in the cathode tank 23 and then sent to the coolant liquid tank 10 and used. After the post-coolant CL1 is electrolyzed in the anode tank 22, it is configured to be fed to the reuse tank 30. As shown in FIG.

<Functional Blocks of Control Device 60>
Next, referring to FIG. 3, functions that can be executed by the control device 60 in this embodiment will be described in detail. The functions described below are programmed by software and configured to be executable by the control device 60 . Also, at least part of such programs may be executed by a known information processing server or other computer remotely located via a known network NW such as the Internet.

That is, the control device 60 in this embodiment includes a pH detection unit 61, an applied voltage determination unit 62, an electrolytic cell drive unit 63, an electrolysis auxiliary agent addition control unit 64, and a pump control unit 65. ing.

The pH detection unit 61 has a function of detecting the pH value in the coolant liquid tank 10 via the above-described pH sensor S1. For example, when the pH value detected by the pH detection unit 61 falls below a predetermined value, the control device 60 supplies the regenerated coolant CL4 from the cathode tank 23 to the coolant tank 10 via the third water pipe 43 and the third pump P3. control the supply to

As a result, when the pH value in the coolant liquid tank 10 becomes acidic and drops to a pH value that poses a problem of breeding of various germs, it is possible to adjust the pH value to an appropriate value. As an example, in the present embodiment, when the pH value detected by the pH detection unit 61 becomes 10.0 or less, the control device 60 supplies the regenerated coolant liquid from the cathode bath 23 into the coolant liquid tank 10. are controlling.

The applied voltage determination unit 62 has a function of determining the voltage to be applied between the anode 22a and the cathode 23a of the electrolytic cell 21 described above. Further, the applied voltage determining section 62 may determine a current value between the anode E2 and the cathode E1 in addition to the above-described voltage. As an example, the voltage applied between the anode 22a and the cathode 23a1 is preferably about 8 V to 45 V, and the current value is preferably controlled in the range of about 5 A to 100 A, but can be adjusted appropriately according to the scale of the device.

After the used coolant CL1 and the diluted coolant CL3 are respectively supplied to the anode cell 22 and the cathode cell 23 via a valve (not shown) and the water supply means 40 described above, the electrolytic cell drive unit 63 increases the applied voltage. It has a function of applying a voltage between the anode 22a and the cathode 23a of the electrolytic cell 21 through the commercial power supply E for a predetermined time based on the voltage determined by the determination unit 62 or the like.

The electrolysis aid addition control unit 64 has a function of adding the above-described electrolysis aid to the diluted coolant CL3 flowing through the first water pipe 41 as necessary. As an example, the electrolytic auxiliary agent addition control unit 64 adds a relatively large amount of the electrolytic auxiliary agent to the diluted coolant CL3 at the beginning of the electrolytic treatment of the electrolytic treatment device 20 (for example, the first electrolytic treatment), while adding , and subsequent (for example, the second and subsequent electrolytic treatments) can be controlled to add a relatively small amount of the electrolysis auxiliary to the diluted coolant CL3. As a result, in the first electrolytic treatment, the inside of the reuse tank 30 is mostly filled with water supplied from the water source 31, so that the diluted coolant liquid CL3 to which a relatively large amount of electrolysis auxiliary is added is used for proper electrolytic treatment. can be done.

Note that the electrolysis aid addition control unit 64 determines the conductivity of the solution flowing into the electrolytic cell 21 based on the conductivity and temperature of the liquid in the reuse tank 30 measured by the sensor S2 installed in the reuse tank 30. An appropriate amount of electrolytic additive to be added can be determined by calculation using a known technique. Further, the electrolysis aid addition control unit 64 may have a function of automatically adjusting the amount of the electrolysis additive to be added according to the voltage value and current value of the electrolytic cell 21 actually operating.

The pump control unit 65 performs the above-described coolant recycling process appropriately for each of the first pump P1, the second pump P2, the third pump P3, the fourth pump P4, and the fifth pump P5. It has a function to drive and control as follows. As described above, the third pump P3 and the fourth pump P4 may be omitted as appropriate.

Further, the control device 60 of this embodiment is configured to be capable of information communication with various sensors S including the pH sensor S1 described above. Furthermore, the control device 60 may monitor the pH value in the coolant liquid tank 10 and the driving status of the electrolytic treatment device 20 through a known display device DD such as a liquid crystal display panel. Also, the control device 60 may be connected to a known network NET such as the Internet via a known communication device CT such as a modem.

[Electrolytic treatment equipment for coolant regeneration]
The coolant regeneration electrolytic treatment apparatus of the present embodiment can be incorporated as part of the above-described circulating electrolytic coolant liquid generation system 100 .
More specifically, the coolant regeneration electrolytic treatment apparatus of the present embodiment includes the above-described ion-exchangeable diaphragm 24, the anode tank 22 for receiving the used coolant CL1 stored in the coolant liquid tank 10, A cathode tank 23 that is separated from the anode tank 22 by a diaphragm 24 and receives the diluted coolant liquid CL3 sent from the reuse tank 30; an anode 22a installed in the anode tank 22; and a control device 60 that applies a predetermined voltage via a commercial power supply E to between.
Note that the coolant regeneration electrolytic treatment apparatus of the present embodiment may further include at least a part of the water feeding means 40 described above.

<Method for Reusing Coolant Liquid for Processing Equipment>
Next, referring to FIG. 4, a method of neutralizing and sterilizing the used coolant liquid stored in the coolant liquid tank 10 using the electrolytic treatment apparatus 20 of the present embodiment, adjusting it to an appropriate pH value, and reusing it. will be explained.

First, in step 1, the coolant liquid after use is stored in the coolant liquid tank 10 by machining the workpiece using the coolant liquid for machining in the above-described machining apparatus. Then, the pH detection unit 61 of the control device 60 performs control to measure the pH value in the coolant liquid tank 10 via the above-described pH sensor S1.

Next, in step 2, the control device 60 determines whether or not the pH value measured in step 1 has become equal to or less than a predetermined reference value (for example, pH 8.0). In step 2, when the pH value is equal to or less than the reference value, the process proceeds to step 3. When the pH value is not equal to or less than the reference value, the process returns to step 1 to continue detecting the pH value.

If the pH value is equal to or less than the reference value in step 2, the voltage to be applied between the anode 22a and the cathode 23a of the electrolytic cell 21 is determined by the applied voltage determination unit 62 in the following step 3.

Next, in step 4, the used coolant CL1 is poured into the anode tank 22 and the diluted coolant CL3 is poured into the cathode tank 23 via the water supply means 40 described above. At this time, a predetermined amount of an electrolysis aid may be added to the diluted coolant liquid CL3 by the electrolysis aid addition means 50 . After that, electrolytic treatment is performed in electrolytic bath 21 based on the applied voltage determined in step 3 . As described above, in the first electrolysis treatment in this embodiment, the diluted coolant solution CL3 fed from the reuse tank 30 is almost tap water at the beginning, so a relatively large amount of electrolysis auxiliary is added. On the other hand, for example, in the second and subsequent electrolytic treatments, the electrolyzed electrolytic coolant CL2 is received in the reuse tank 30 and diluted with tap water, so a relatively small amount of the electrolysis auxiliary is used compared to the first treatment. will be added.

Next, in step 5, the electrolytic coolant CL2 electrolyzed in the anode tank 22 of the electrolytic tank 21 is sent to the reuse tank 30 through the fourth water pipe 44, and the alkaline solution electrolyzed in the cathode tank 23 The regenerated coolant CL4 as water is sent to the coolant liquid tank 10 .

As described above, the used coolant CL1 is first poured into the anode tank 22 of the electrolytic treatment device 20, electrolyzed in the anode tank, and neutralized from alkaline to near-neutral pH value. After that, the water is poured into the cathode tank 23 of the electrolysis treatment device 20 , electrolyzed again in the cathode tank, and finally returned to the coolant liquid tank 10 . That is, in the present embodiment, the coolant after use is circulated through the electrolysis device, as described above, so that the coolant is regenerated and circulated.

Next, in step 6, it is determined whether or not the pH value in the coolant liquid tank 10 has become equal to or less than a predetermined completion reference value. As such a completion standard value, for example, the vicinity of the proper pH value of the coolant liquid generally used in the processing equipment may be set. As an example, although pH 9.0 is set as the completion reference value in this embodiment, other pH values may be used as the reference without being limited to this example.

Then, in step 6, if the pH value in the coolant liquid tank 10 has not reached the above-described completion reference value, the process returns to step 4, and the liquid to be newly treated in the above-described electrolytic treatment device 20 is injected, The regeneration circulation treatment of the coolant through the above-described electrolytic treatment is repeated. On the other hand, when the pH value in the coolant liquid tank 10 reaches the above-described completion reference value in step 6, the next step 7 is performed.

In the subsequent step 7, it is determined whether or not the machining of the workpiece by the above-described machining device has been completed. If the machining of the workpiece has not yet been completed, the process returns to step 1 and the above-described processing is repeated.

In subsequent step 8, for example, various known device shut-down processes such as accommodation of the tool used for machining the workpiece and withdrawal operation of the machining stage are executed, and the coolant liquid for the machining device according to the present embodiment is recycled. The method also ends.

As described above, the method for recycling the coolant for machining according to the present embodiment includes the step of machining the workpiece using the coolant for machining, and storing the coolant CL1 used in the machining in the coolant tank 10. In the process, the stored used coolant CL1 is received by the anode tank 22 of the electrolytic treatment device 20, and the liquid stored in the reuse tank 30 is received by the cathode tank 23, and electrolytic treatment is performed in each tank. and a step of feeding the electrolytic coolant CL2 electrolyzed in the anode tank 22 to the reuse tank 30 and feeding the alkaline water electrolyzed in the cathode tank 23 to the coolant tank 10 as the regenerated coolant CL4. ,including. In the method for recycling the machining coolant liquid of the present embodiment, the used coolant liquid CL1 is electrolyzed and diluted with the liquid (such as tap water) of the water source 31 in the reuse tank 30, and the diluted liquid is used. A post-coolant solution (diluted coolant solution CL3) is fed to the cathode tank and electrolyzed.

According to the circulating electrolytic coolant generation system 100 including the electrolytic treatment device for coolant regeneration according to the present embodiment described above, after use in the anode tank of the electrolytic treatment device, the coolant is electrolytically treated to neutralize and sterilize. In addition, the coolant is electrolyzed again in the cathode tank to adjust the pH value to be appropriate as the coolant for machining and is returned to the coolant tank, so that the coolant for machining can be circulated and recycled with high efficiency without waste.

Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. It is understood that these also naturally belong to the technical scope of the present invention.

For example, in the above-described embodiment, the coolant liquid is circulated and regenerated in the electrolytic treatment device 20 according to the pH value in the coolant liquid tank 10. However, the coolant liquid is not limited to this embodiment, and for example, after a certain period of time has passed, the coolant liquid is regenerated. The above pH value may not be used as a trigger, such as performing circulation regeneration treatment, and may be performed periodically.

In the above-described embodiment, if the polarity of the voltage applied to the electrolytic cell 21 is not changed, minerals will gradually adhere to the cathode side, and if this is left for a long period of time, water may eventually stop flowing into the electrolytic cell 21. be. Therefore, the control device 60 may perform control to reverse the polarity of the voltage applied to the electrolytic cell 21 as a countermeasure.
FIG. 5 shows a circulation type electrolytic coolant liquid generation system 110 based on Modification 1. As shown in FIG. In FIG. 5, the description will focus on the parts different from the above-described embodiment, and the same configurations as those in the above-described embodiment will be omitted or given the same reference numerals (the same applies to Modification 2). .

<Modification 1>
As shown in FIG. 5, the control device 60 in this modified example performs switching control of the cathode and the anode in the electrolytic cell 21 at predetermined intervals. As a specific device configuration, as shown in FIG. 1 switching flow path 45a to 6th switching flow path 45f) and the like are applied.

That is, as shown in the figure, a first three-way valve V1 is provided in a second water pipe 42 that connects the coolant liquid tank 10 to one of the electrolytic cells 21 (the tank located on the upper side in the figure), A second switching passage 45b is connected between the first three-way valve V1 and the electrolytic cell 21 from the reuse tank 30 via a second three-way valve V2. One end of the third switching flow path 45c is connected to the second three-way valve V2 (A side in the drawing) on the second switching flow path 45b connected to the reuse tank 30, and the third switching flow path 45c The other end of flow path 45 c is connected to the other electrolytic cell 21 . One end of the first switching flow path 45a is connected to the first three-way valve V1 (side B in the drawing), and the other end of the first switching flow path 45a is connected to the third switching flow path 45c. be done.

Furthermore, a water supply path is established from one of the electrolytic tanks 21 to the reuse tank 30 via a fourth water pipe 44, and the fourth water pipe 44 is provided with a third three-way valve V3. there is One end of the fourth switching flow path 45 d is connected to the other electrolytic cell 21 . The other end of the fourth switching passage 45d is connected between the third three-way valve V3 and the reuse tank 30 in the fourth water pipe 44 described above. A fourth three-way valve V4 is provided on the fourth switching flow path 45d, and one end of the fifth switching flow path 45e is connected to the fourth three-way valve V4 (side A in the drawing). The other end is connected to the coolant liquid tank 10 . Further, one end of the sixth switching passage 45f is connected to the third three-way valve V3 (side B in the drawing), and the other end of the fifth switching passage 45e is connected to the fourth three-way valve V4 and the coolant liquid. connected between the tanks 10;

For example, when one of the electrolytic cells 21 (the upper side in the drawing) becomes the positive electrode, the control device 60 allows all of the first three-way valve V1 to the fourth three-way valve V4 to flow into the C side and the A Perform valve control on each three-way valve to let water out from the side. On the other hand, the control device 60, for example, when the other cell (lower side in the drawing) of the electrolytic cell 21 described above becomes the positive electrode, all of the first three-way valve V1 to the fourth three-way valve V4 enter the C side. At the same time, each three-way valve is controlled so that water flows out from the B side. As a result, it is possible to exchange the liquid inlet and outlet passages according to the polarity reversal of the electrolytic cell 21 via the above-described plurality of three-way valves while appropriately interchanging the piping configuration at the time of entering and exiting the electrolytic cell 21. Become.

The circulating electrolytic coolant liquid generation system in the modified example described above includes a three-way valve that switches the water inlet and water outlet flow paths to the electrolytic cell as the polarity of the electrolytic cell is reversed (switching between the anode and the cathode), and the switching flow contains roads. As a result, it is possible to solve the above-described problem caused by minerals adhering to the cathode side of the electrolytic bath 21 .

<Modification 2>
Next, a circulation type electrolytic coolant liquid generation system 120 including an electrolytic treatment apparatus for coolant regeneration according to Modification 2 will be described with reference to FIG. 6 .
In the above-described embodiment and modified example 1, since the coolant liquid after use is neutralized by electrolytic treatment, it is basically not necessary to treat the liquid in the reuse tank 30 with chemicals or the like, and the liquid can be discharged. It was possible to drain to location DP.

On the other hand, in the circulating electrolytic coolant liquid generation system 120 according to the second modification, the above-described implementation is performed on the premise that the water is discharged to the drainage place DP without basically requiring treatment with the above-described chemicals or the like. Compared to the form, the main feature is that a water-soluble cutting fluid adding means 70 for adding a predetermined amount of water-soluble cutting fluid to the coolant tank 10 is further included.

That is, as shown in FIG. 6, the water-soluble cutting fluid adding means 70 in Modification 2 is a water-soluble cutting fluid that stores the undiluted fluid of the water-soluble cutting fluid (coolant fluid) used for machining by the machining apparatus described above. A tank 71 , a known discharge pump 72 for discharging a predetermined amount of water-soluble cutting stock solution from the water-soluble cutting stock solution tank 71 , and a coolant tank connected to the water-soluble cutting stock solution tank 71 via the discharge pump 72 . and a stock solution supply pipe 73 for supplying water-soluble cutting stock solution to 10 .

In Modification 2, the undiluted solution is used as the water-soluble cutting fluid added to the coolant tank 10. However, the present invention is not limited to this form, and for example, a diluted solution of the water-soluble cutting fluid diluted with water may be used. .

As an example, the control device 60 controls, for example, (a) the timing at which the liquid in the reuse tank 30 is drained through the discharge pipe 32, and (b) the processing device for a predetermined time (for example, several to several times). A predetermined amount of water-soluble undiluted cutting fluid may be added to the coolant tank 10 through the water-soluble cutting fluid adding means 70 at the timing when the machining process is executed for ten hours or the like.
The amount of the water-soluble cutting liquid to be added can be appropriately adjusted depending on the components of the water-soluble cutting liquid to be added, the processing application of the processing apparatus, and the like.

In the circulating electrolytic coolant generation system 120 according to the modified example 2 described above, in addition to the effects of the above-described embodiment, the coolant (cutting fluid, etc.) whose quality or quantity is insufficient due to wastewater treatment or processing can be used. It can be replenished as needed. As a result, it becomes possible to circulate and recycle the coolant liquid while maintaining the quality of processing in the processing equipment at a high level.

INDUSTRIAL APPLICABILITY As described above, the circulating electrolytic coolant liquid generation system of the present invention is suitable for a purification facility or the like that can electrolyze and recycle the used coolant liquid used in the processing equipment with high efficiency without waste. there is

REFERENCE SIGNS LIST 10 coolant liquid tank 20 electrolytic treatment device 30 reuse tank 40 water feeding means 50 electrolysis auxiliary agent addition means 60 control device 70 coolant liquid addition means 100, 110, 120 circulation type electrolytic coolant liquid generation system

Claims (6)

a coolant liquid tank for storing the used coolant liquid used in machining the workpiece;
Electrolytic processing comprising: an anode tank connected to the coolant liquid tank to receive the used coolant liquid stored in the coolant liquid tank; and a cathode tank separated from the anode tank by an ion-exchangeable diaphragm. a device;
a reuse tank connected to each of the anode tank and the cathode tank for storing a diluted coolant liquid produced by diluting the electrolytic coolant solution electrolyzed in the anode tank with water;
water feeding means capable of feeding the used coolant liquid to the anode tank and the diluted coolant water to the cathode tank,
The diluted coolant liquid is electrolyzed in the cathode tank and then fed to the coolant liquid tank, and the used coolant liquid is electrolyzed in the anode tank and then fed to the reuse tank.
A circulating electrolytic coolant liquid generation system characterized by: an electrolytic auxiliary agent adding means for adding an electrolytic auxiliary agent to the diluted coolant liquid sent from the reuse tank to the cathode tank,
The diluted coolant liquid to which the electrolysis auxiliary is added is electrolyzed in the cathode tank,
The circulation type electrolytic coolant liquid generation system according to claim 1. further comprising a control device that controls the driving of the electrolysis device and the amount of the electrolysis auxiliary added;
The control device adjusts the amount of the electrolysis auxiliary added to the diluted coolant liquid according to the number of voltage applications in the electrolysis device.
The circulation type electrolytic coolant liquid generation system according to claim 2. further comprising a foreign matter removing filter for removing foreign matter by performing solid-liquid separation and oil-water separation on the used coolant liquid fed from the coolant liquid tank to the anode tank;
The used coolant liquid from which the foreign matter has been removed is electrolyzed in the anode tank,
The circulation type electrolytic coolant liquid generation system according to any one of claims 1 to 3. An electrolytic treatment apparatus for coolant regeneration used in the circulation type electrolytic coolant generation system according to any one of claims 1 to 4,
an ion-exchangeable diaphragm; and
an anode tank for receiving the used coolant liquid stored in the coolant liquid tank;
a cathode tank that is separated from the anode tank by the diaphragm and that receives the diluted coolant liquid sent from the reuse tank;
a control device that applies a predetermined voltage between the anode installed in the anode tank and the cathode installed in the cathode tank via a power supply;
An electrolytic treatment device for coolant regeneration, comprising: a step of machining a workpiece using a machining coolant;
A step of storing the used coolant liquid used in the processing in a coolant liquid tank;
a step of receiving the stored used coolant liquid in the anode tank of the electrolytic treatment apparatus, receiving the liquid stored in the reuse tank in the cathode tank, and performing electrolytic treatment in each tank;
The electrolytic coolant liquid electrolyzed in the anode tank is fed to the reuse tank, and the alkaline water electrolyzed in the cathode tank is neutralized so as to become a reused coolant liquid and fed to the coolant liquid tank. and
the used coolant liquid is electrolyzed and diluted with the water in the reuse tank;
The water and the diluted after-use coolant liquid are sent to the cathode tank, and a part of the coolant liquid is drained to prevent putrefaction of the coolant water.
A coolant liquid recycling method characterized by: