WO2003097535A1

WO2003097535A1 - Aqueous solution for diluting water-soluble metal working fluid, apparatus for production thereof, fluid coolant, and apparatus for production of fluid coolant

Info

Publication number: WO2003097535A1
Application number: PCT/JP2003/006068
Authority: WO
Inventors: Masayuki Takahashi; Yoshikazu Nakagawa; Kiyoshi Nishimura; Mutsumi Yotsuzuka; Toshiyasu Hirokawa
Original assignee: Nippon Oil Corporation; Takahashi Kinzoku Co., Ltd.
Priority date: 2002-05-17
Filing date: 2003-05-15
Publication date: 2003-11-27
Also published as: JPWO2003097535A1; AU2003231501A8; AU2003231501A1

Abstract

An aqueous solution for diluting a water-soluble metal working fluid, characterized in that it is produced through the electrolysis of water, has a pH of 8 to 13, and comprises active oxygen contained in hydrogen peroxide in a concentration of 1 mg/L or more. The aqueous solution is produced by supplying water to an electrolysis vessel which comprises a cathode comprised of a cathode electricity feeder made from stainless steel plated with nickel or the like or from titanium plated with platinum or the like and an electrode made from a carbonaceous material or a gas diffusion electrode and an anode made from titanium plated with platinum or the like, the cathode and the anode being isolated by a diaphragm and provided opposite to each other, and supplying air or a gas containing oxygen to the surface of the cathode, and then passing an electric current. The mixing of the aqueous solution with a water-soluble metal working fluid provides a fluid coolant which exhibits durable putrefaction preventing effect, without adversely affecting a human body, the environment, the fluid itself, or performance capabilities of the fluid.

Description

Description Dilution water of water-soluble oil for metalworking, its manufacturing equipment, coolant liquid, and coolant liquid

[Technical field]

The present invention relates to a dilution water of a water-soluble metal working oil, an apparatus for producing the same, a coolant liquid obtained by mixing the dilution water with a water-soluble metal working oil, and a coolant liquid manufacturing apparatus.

[Background technology]

In processing machines such as machine tools for cutting, grinding and rolling, water-soluble oils for metal working are used for lubrication and cooling (ie, undiluted solutions of water-soluble industrial lubricating oils. ) Is often used. Water-soluble oils for metal processing are usually used after being diluted about 10 to 20 times with water, and the diluted water-soluble oils for metal processing are generally called coolant liquids. This coolant liquid is usually used in circulation, but contains components preferred by microorganisms, and is often exposed to conditions in which microorganisms can easily propagate due to heat generated during metalworking. It has the disadvantage that it will rot if used for a long time. The decayed coolant will cause problems such as bad odors, poor metalworking performance, and metal corrosion, and must be replaced with new coolant. The labor and cost required to change the coolant liquid impose a great economic burden on the business operator. As the most common countermeasures against the decay of the coolant liquid, for example, a method using an ethanolamine compound, an isotizazoline compound, or a metal ion such as copper or silver as a preservative or disinfectant is known. Japanese Unexamined Patent Publications Nos. Sho 62-2-15507, Japanese Unexamined Patent Application Publication No. 2-294496, Japanese Unexamined Patent Application Publication No. 5-230492, Japanese Unexamined Patent Application Publication No. ). Other methods of extending the service life of the coolant except for adding additives include, for example, sterilization by radiation (Japanese Patent Application Laid-Open No. 2-219597) and sterilization by ultrasonic waves (Japanese Patent Application No. 2 4 5 4 9 4), sterilization by ultraviolet irradiation And methods of heat sterilization by blowing steam (Japanese Unexamined Patent Publication No. 56-95992).

However, the method of adding preservatives etc. may have a bad effect on the human body or the surrounding environment when used for a long time. For example, it has been pointed out that isothiazoline compounds cause skin irritation and allergies, and that some ethanolamine compounds are carcinogenic and environmental hormones.

Sterilization methods using radiation, ultrasonic waves, and ultraviolet irradiation require expensive equipment and high running costs. Furthermore, it has the disadvantage that the bactericidal effect is weak when the bacteria are grown.

Heat sterilization by steam injection does not cause these problems.However, since the coolant is exposed to a high-temperature atmosphere, some of the components are deteriorated, resulting in reduced cutting performance, reduced grinding performance, and poor emulsified state. Sometimes.

As described above, the conventional methods have some disadvantages, and none of them can be said to be sufficient methods for extending the life of the coolant.

The present invention provides a water-soluble metal working oil dilution water which is advantageous for the preparation of a coolant liquid having a sustained anti-rotation effect without adversely affecting the human body, the environment, and the oil agent and its processing performance. It is an object of the present invention to provide an apparatus, a coolant liquid obtained by mixing dilution water and a water-soluble metal working oil, and an apparatus for producing a coolant liquid.

[Disclosure of the Invention]

The present inventors have made intensive studies on the above-mentioned problems, and as a result, have completed the present invention.

The present invention relates to a water-soluble metal working oil diluted water obtained by electrolysis of water and having a pH of 8 or more and 13 or less and containing hydrogen peroxide-containing active oxygen at a concentration of 1 mg ZL or more. is there.

Further, the present invention provides a cathode composed of a stainless steel cathode power supply and an electrode formed of a carbon-based material, and an anode formed of platinum and titanium coated with platinum or platinum or a iridium. Provided facing each other, and the cathode An electrolysis apparatus including an electrolytic cell provided with an air supply section for supplying gas containing air or oxygen to the surface and a water supply port for introducing water, and applying a voltage to both electrodes of the apparatus. Water-soluble metal processing to produce water with a pH of 8 or more and 13 or less and a concentration of lmgZL or more of active oxygen containing hydrogen peroxide by electrolyzing water introduced into the electrolytic cell It is in the equipment for producing dilution water of oil for use.

Further, the present invention is formed of a perforated cathode feeder and a carbon-based material made of stainless steel, nickel-plated stainless steel, or platinum and / or titanium-plated titanium. A cathode composed of a gas diffusion electrode and an anode made of platinum and Z or titanium plated with Z are separated by a diaphragm and provided to face each other, and the cathode surface side opposite to the diaphragm is provided. Electrolyzer with an air supply unit for supplying gas containing air or oxygen to the cathode, and an electrolytic cell provided with a water supply port for supplying water to the cathode chamber between the cathode and the diaphragm By applying a voltage to both electrodes of the device and electrolyzing water introduced into the electrolytic cell, it contains hydrogen peroxide at a pH of 8 or more and 13 or less and a concentration of 50 mg / L or more. Active oxygen Including in manufacturing devices dilution water soluble metal working oil for the production of water.

The present invention is also formed of a perforated cathode feeder and carbonaceous material made of stainless steel, stainless steel with nickel plating, or titanium with plating with platinum and / or iridium. A hollow cylindrical cathode composed of a gas diffusion electrode and an anode made of platinum and / or titanium coated with a iridium are separated by a diaphragm and provided to face each other. The cylindrical cathode has a structure in which a cathode feeder with a hole is placed inside and a gas diffusion electrode is placed outside, and it also supplies air or oxygen-containing gas to the inside of the cathode hollow. An electrolytic cell including an electrolytic cell provided with a water supply port for supplying water to the cathode chamber between the cathode outer portion and the diaphragm. To produce water containing hydrogen peroxide-containing active oxygen at a pH of 8 or more and 13 or less and a concentration of 50 mg or more by applying a voltage to It is in the manufacturing equipment of dilution water of water-soluble metal working oil.

Further, the present invention relates to a water-soluble metal working oil and a dilution water of the water-soluble metal working oil. And a mixture of the two.

Still further, the present invention provides a coolant liquid producing apparatus including the above-mentioned dilution water producing apparatus, and a mixing apparatus for mixing the dilution water produced by the apparatus with a water-soluble metal additive oil agent. A liquid supply start sensor that sends a supply signal when the amount of coolant in the processing machine decreases from a predetermined level when it is full, in order to automatically supply liquid to the processing machine. It is necessary to provide a control circuit for controlling the signals from the full liquid level sensor, which sends out the supply stop signal when the one liquid level is full, the liquid supply start liquid level sensor, and the full liquid level sensor. There is also a featured coolant production equipment. An apparatus for producing dilution water of a water-soluble metal working oil agent of the present invention (hereinafter also referred to as an apparatus for producing dilution water of the present invention), and dilution water produced from the apparatus for producing dilution water of the present invention and water-soluble metal An apparatus for producing a coolant liquid obtained by mixing with a processing oil will be described below with reference to the accompanying drawings.

First, the dilution water producing apparatus of the present invention will be described.

1 to 9 schematically show preferred specific examples of the dilution water producing apparatus of the present invention. FIG. 1 shows a vertical cross-sectional view of an example of the dilution water producing apparatus of the present invention, FIGS. 2 and 3 show a top view and a bottom view of the apparatus, respectively, and FIG. FIG. 3 shows a perspective view when only the component is taken out and viewed. 5 and 6 show vertical sectional views of other examples of the dilution water producing apparatus of the present invention, respectively, and FIG. 7 shows a perforated cathode feeder or anode used in FIGS. 5 and 6. These are three specific examples of the shape. FIG. 8 shows a vertical sectional view of still another example of the dilution water producing apparatus of the present invention, and FIG. 9 shows a view of the apparatus from above. In the example of the dilution water producing apparatus 1 of the present invention shown in FIG. 1, the electrolytic cell 2 is formed in a vertical cylindrical shape. In the electrolytic cell 2, a concentric circle is formed with the cylindrical cathode 3 as the center, the diaphragm 5 and the anode 4 in order from the radially inner side to the outer side, and the diaphragm 5 as the boundary. It is provided. The lower surface and the upper surface of the electrolytic cell 2 are sealed except for the opening with caps 10 and 11, for example, a resin cap. I have. Therefore, in the electrolytic cell 2, the cathode chamber 12 is formed on the inner peripheral side of the diaphragm 5 and the anode chamber 13 is formed on the outer peripheral side thereof. A water supply port 6 for supplying water is provided in each of these two chambers at a lower portion thereof, and a dilution port for taking out the dilution water produced here is provided at an upper portion of the cathode chamber 12. A water outlet 8 is provided, and an acid ion water outlet 9 containing no hydrogen peroxide is provided above the anode chamber 13. In the center of the bottom of the cylindrical cathode 3, an air supply unit 7 for sending gas containing air or oxygen to the cathode surface is provided. The cathode 3 and the anode 4 are completely insulated, and the cathode 3 is connected to the negative pole of the power supply (not shown), and the anode 4 is connected to the positive pole of the power supply (not shown). Electrolysis occurs in the electrolytic cell. The cathode 3 is formed of a carbon-based material, but as shown in FIG. 4, a structure in which graphite 15 is adhered to a cylindrical (or tube) -shaped stainless steel cathode feeder 14 It is preferable to have The graphite 15 can be brought into close contact by, for example, winding a felt of graphite on a cathode feeder 14 made of stainless steel and fixing it with an adhesive or metal fittings. If the electrode surface is made of a carbon-based material (especially graphite) in this way, the cathode itself does not necessarily need to be made of a carbon-based material. Rather, such a structure can be obtained when the same voltage is applied. It facilitates generation of hydrogen peroxide and alkali ions, and can obtain water having a high concentration of hydrogen peroxide and a high pH.

By forming the cathode from a carbon-based material, the reduction reaction of gas generated by electrolysis (air or oxygen-containing gas sent from the air supply unit) can be stopped at the stage of hydrogen peroxide. Hydrogen peroxide can be generated more efficiently. At the cathode, alkali ions are also generated at the same time, and the water in the cathode chamber 12 becomes highly alkaline. When the cathode is formed without using a carbon-based material, electrolytic alkali ions not containing hydrogen peroxide are generated, and the cathode chamber 12 becomes alkali ion water. If the cathode feeder is made of stainless steel, the iron will dissolve into the water over time and react with hydrogen peroxide, reducing the concentration of hydrogen peroxide. In order to stabilize the concentration of hydrogen peroxide, it is preferable that nickel is particularly applied to a portion where iron is easily dissolved (for example, a welded portion), and more preferably the entire surface of the stainless steel electrode is plated. Is preferred. The air supply section 7 provided at the bottom of the cylindrical cathode extends spirally from the inside toward the top along the cathode surface. The air supply unit 7 can be formed using, for example, a resin tube (or pipe) 16, and the surface thereof has a myriad of air diffusion holes (gas outlets) 16 over its entire length. a ... is provided, and the tip is closed. The helical tube and the diffuser holes 16a allow smaller bubbles to be efficiently brought into contact with the cathode surface over the entire area thereof, thus enabling efficient production of active oxygen containing hydrogen peroxide. .

The anode 4 is formed of titanium plated with platinum and / or iridium to prevent oxidation of the anode.

The diaphragm 5 is provided to prevent the hydrogen peroxide generated in the cathode chamber 12 from moving to the anode side and being decomposed, and also prevent the alkali ions generated at the same time from moving to the anode side. The material of the diaphragm is preferably a polyolefin-based material or cellulose. For example, polychlorinated polyethylene, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene (PE), Polybutyl alcohol (PVA;), and cellulose may be mentioned. Among these, polychlorinated polyethylene, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene (PE), and polyvinyl alcohol (PVA) are more preferable. Alternatively, an ion-exchange membrane can be used. In this case, when a cation-exchange membrane is used, only the movement of cations from the anode side to the cathode side occurs, and the anions on the anode side become This is preferable because it can prevent the diffusion from moving from the anode side to the cathode side.

In the production of dilution water using the dilution water production apparatus shown in FIG. 1, first, a predetermined amount of water is introduced into the cathode chamber 12 and the anode chamber 13 from the water supply port 6 of the electrolytic cell 2, and the air supply section From step 7, gas (air or gas containing oxygen) is blown into the surface of the cathode 3 to energize both electrodes. Electrolysis occurs due to energization, and active oxygen and hydrogen ion containing hydrogen peroxide as a main component are generated on the surface of the cathode 3, so that the cathode chamber 12 contains active oxygen containing hydrogen peroxide and alkali ions. Dilution water is produced. The produced dilution water is taken out from the dilution water take-out port 8 and mixed with a water-soluble metal working oil to prepare the coolant liquid of the present invention. Obtained in this way The diluted water inhibits the growth of bacteria by the alkali ions contained in the diluted water, and acts synergistically with the bactericidal action of active oxygen (mainly hydrogen peroxide), thus exhibiting a high antiseptic action. The concentration of active oxygen and alkali ions in the produced dilution water can be adjusted by adjusting the electrolysis time of the water in the electrolytic cell. Note that, due to the electrolysis, acidic ions are generated on the anode surface, and acidic ion water is generated in the anode chamber 13. Therefore, the acidic ions are appropriately discharged through the acidic ion water outlet 9. Another example of the dilution water producing apparatus of the present invention shown in FIGS. 5 and 6 is that a cathode 3 composed of a cathode feeder 14 and a gas diffusion electrode 17 was plated with platinum and Z or iridium. An anode 4 made of titanium is separated by a diaphragm 5 and provided so as to face each other. An air supply unit 7 for supplying air or a gas containing oxygen to the cathode surface side opposite to the diaphragm 5 is provided. In addition, a water supply port 6 for supplying water to the cathode chamber 12 between the cathode 3 and the diaphragm 5 is provided.

The cathode 3 composed of a cathode feeder and a gas diffusion electrode has a configuration in which a cathode feeder with a hole is combined with a gas diffusion electrode for diffusing a gas containing air or oxygen. 5 and 6, a net 18 for fixing the gas diffusion electrode 17 is provided.

The air supply section 7 provided on the cathode surface side opposite to the diaphragm 5 for supplying air or oxygen-containing gas may have a structure open to the outside, or may form a room. In addition, a supply port (not shown) for introducing a gas containing air or oxygen may be provided.

The air or gas containing oxygen supplied from the air supply unit 7 is supplied from the perforated cathode power supply 14 to the cathode chamber 12 through the gas diffusion electrode 17. On the other hand, in the cathode chamber 12, water is supplied from the water supply port 6, and active oxygen containing hydrogen peroxide generated by the electrolysis in the cathode chamber 12 and dilution water containing Al-Lion are supplied to the dilution water outlet 8. Of the present invention, and mixed with a water-soluble metal working oil agent to prepare the coolant liquid of the present invention.

As the material of the cathode power supply, stainless steel or stainless steel subjected to nickel plating is preferably used. Also, with platinum and Z or iridium Titanium subjected to plating is also preferably used. As the gas diffusion electrode, a carbon fiber cloth or a filter having a thickness of about 0.3 to 0.5 mm subjected to a water-repellent treatment is preferably used, and GDE manufactured by E-TEK of the United States is particularly preferable.

Fig. 5 shows an example in which an electrode plate with holes is used as the anode, and Fig. 6 shows an example in which an electrode plate with no holes is used.

In FIG. 5, the water supplied from the water supply port 6 passes outside the anode (the side opposite to the diaphragm) and also passes between the anode and the diaphragm through the perforated anode plate. The generated acidic ionized water is discharged from the acidic ionized water outlet 9. In this structure, since the anode is closer to the diaphragm, the voltage drop due to anode water is reduced, and the electrolysis efficiency is improved.

In FIG. 6, water is supplied between the anode plate and the diaphragm, and the generated acidic ionized water is discharged from the acidic ionized water outlet 9. This structure has an advantage that the electrode area can be increased because a water hole is not required in the anode plate.

In FIGS. 5 and 6, reference numeral 19 denotes an outer plate, reference numeral 21 denotes a spacer, and reference numeral 22 denotes a notkin.

FIG. 7 shows an example of a specific shape of the cathode power supply body and the anode having the holes. However, the shape and size of the holes are not limited to these examples.

In the example of the dilution water producing apparatus of the present invention shown in FIG. 8, the electrolytic cell 2 is formed in a vertical cylindrical shape as in FIG. In the electrolytic cell 2, a diaphragm 5 and an anode 4 are formed in a concentric circle at intervals from a radially inner side to an outer side with a hollow cylindrical cathode 3 as a center. Accordingly, in the electrolytic cell 2, the cathode chamber 12 is formed on the inner peripheral side of the diaphragm 5 and the anode chamber 13 is formed on the outer peripheral side thereof. A water supply port 6 for supplying water is provided in a lower part of each of these chambers, and an active oxygen containing hydrogen peroxide generated here is provided in an upper part of the cathode chamber 12. A take-out port 8 containing diluted water containing alkali and alkaline ions is provided, and a take-out port 9 for taking out acidic ion water is provided above the anode chamber 13. At the bottom and top of the hollow cylindrical cathode 3, an air supply unit 7 for sending air or a gas containing oxygen to the inside of the hollow of the cathode 3 is provided. The cathode 3 is composed of an electrode composed of a perforated cathode feeder 14 and a gas diffusion electrode 17, with a perforated cathode feeder arranged inside and a gas diffusion electrode outside. Are arranged. The gas containing air or oxygen supplied from the air supply unit 7 diffuses from the inside of the cathode 3 to the cathode chamber 12 side. Water is supplied from the water supply port 6 in the cathode chamber 12, and dilute water containing active oxygen including hydrogen peroxide and alkali ions generated in the cathode chamber 12 by electrolysis is taken out from the dilution water outlet 8. The coolant liquid of the present invention can be prepared by mixing with a water-soluble metal working oil. The dilution water of the present invention has a hydrogen peroxide concentration of 1 mg / L or more, preferably 3 mgZL or more, and more preferably 50 mgZL or more, in order to obtain the effect of inhibiting the growth of bacteria. When a gas diffusion electrode is used as the electrode constituting the cathode, air or oxygen is efficiently taken into the reaction site on the electrode surface, the reaction area can be increased, and the concentration of hydrogen peroxide in the dilution water can be increased (5 Omg / L or more). When the concentration of hydrogen peroxide is less than ImgZL, a sufficient bacterial growth inhibitory effect cannot be obtained. The pH of the dilution water is 8 or more and 13 or less, preferably 9 or more and 12 or less for the same reason. If the pH of the dilution water is less than 8, a sufficient bacterial growth inhibitory effect cannot be obtained. If the pH exceeds 13, the metal material may be adversely affected during metal working. For example, when machining aluminum, aluminum can corrode. The production capacity of the dilution water having such a function is usually 0.1 to 1 L / min with the apparatus of the present invention, and by reducing the production capacity of the dilution water per unit time, a high concentration of peroxide can be obtained. Dilution water containing hydrogen can be obtained. In addition, since the generation capacity of dilution water is proportional to the electrode area, the generation capacity can be increased by enlarging the electrode area.

The coolant liquid of the present invention can be prepared by mixing the dilution water obtained from the above-mentioned dilution water production apparatus with a water-soluble metal working oil (coolant stock solution). Next, the coolant liquid producing apparatus will be described.

FIG. 10 is a diagram schematically showing an arrangement of an example of the coolant liquid producing apparatus of the present invention. The coolant liquid production apparatus 100 shown in FIG. 10 includes a dilution water production apparatus 30 of the present invention, a coolant stock solution tank 40, a coolant stock solution pump 41, a dilution water and a coolant. A mixing device 50 for mixing with the undiluted solution, a water softener 20, and a coolant liquid metering pump 54 are included. Further, the mixing device 50 is provided with a mixing tank 51, a liquid level sensor 52, and a stirrer 53. The water softener 20 is used to keep the calcium and magnesium ions in water low and protect the electrodes. These ion concentration is 0. It is preferable that 0 0 5 mmol Z dm ³ or less. The coolant liquid can be manufactured as follows.

First, water W is passed through a water softener 20, and the obtained soft water is introduced into a dilution water producing device 30. In the dilution water producing device 30, the introduced soft water is electrolyzed by the above-described method, and the dilution water 30a containing active oxygen containing hydrogen peroxide and alkali ions is produced. The produced dilution water 30a is then introduced into the mixing tank 51 of the mixing device 50 together with the coolant undiluted solution 40a. In addition, in mixing the produced dilution water 30a with the coolant undiluted solution 40a, in order to easily and accurately adjust the mixing amount, a reservoir tank (shown in the drawing) is provided in front of the mixing devices 50 and 5OA. None) is preferable to store and use the produced dilution water 30a.

In mixing the dilution water 30a and the coolant stock solution 40a, first, the dilution water 30a is controlled by the liquid level sensor 52 and introduced to a predetermined liquid level. Then, the supply of the dilution water 30a is stopped, and the coolant stock solution 40a is introduced from the coolant stock solution tank 40 into the mixing tank 51 via the coolant stock solution pump 41. The two liquids are mixed while stirring with a stirrer 53 to produce a coolant liquid 100a. The dilution ratio of the stock solution 40a with the dilution water 30a is usually 5 to 30 times, preferably 8 to 20 times the stock solution. A dilution ratio lower than 5 times is too viscous to be suitable for processing, while a dilution ratio higher than 30 times adversely affects the processing performance, for example, the cutting performance decreases in the case of a cutting machine. It will be easier. The manufactured coolant 100 a is supplied to the processing machine 90 via a coolant liquid metering pump 54. In the coolant production apparatus 100 shown in FIG. 10, the mixing device 50 mixes, for example, the dilution water 30 a and the undiluted coolant 40 a directly at a predetermined dilution rate without providing the mixing tank 51. Then, it can be replaced with an apparatus for producing a coolant liquid 100a (hereinafter referred to as a direct mixing type mixing apparatus). Fig. 11 shows a cooler in which the mixing device 50 of the coolant production device shown in Fig. 10 is replaced with the direct mixing type mixing device 5OA. FIG. 4 is a diagram schematically showing an example of an arrangement of a liquid production apparatus 200. As a direct mixing type mixing device, for example, a pipe (for example, 4 mm inner diameter) for adding a coolant undiluted to a main pipe (for example, stainless steel with a diameter of 10 mm) for passing dilution water ) Is inserted vertically, and the mixing device has a structure in which the tip of the pipe reaches the center of the main pipe. This type of mixing device eliminates the need for the mixing tank 51, and allows the device S to be simpler and smaller.

Processing machines, such as cutting, grinding, or rolling mills, usually have a coolant tank for storing a predetermined amount of coolant. When the coolant liquid is directly supplied to the coolant tank from the coolant liquid production apparatus to such a processing machine, the coolant liquid production apparatus of the present invention supplies the produced coolant liquid to the processing machine by automatic control. Is preferably provided.

FIG. 12 shows an arrangement of an example of a coolant liquid manufacturing apparatus in which the coolant liquid manufacturing apparatus shown in FIG. 10 is provided with a control circuit for controlling the amount of the coolant tank in the processing machine to a predetermined amount. It is a figure which shows typically. As shown in FIG. 12, the coolant production apparatus 300 is operated when the coolant level in the coolant tank 91 in the processing machine 90 decreases from a predetermined level when the tank is full (usually 100%). The liquid supply start sensor 62 that sends a supply signal when the coolant level decreases to 50%), the full sensor 61 that sends a supply stop signal when the coolant level is full, and from these sensors And a control circuit 60 for controlling the signals. Examples of the above-mentioned sensor include those utilizing a float type, an electric type, an optical type, and an ultrasonic type. These sensors may be integral or separate.

The control circuit 60 is also in communication with the dilution water production device 30 and the coolant stock solution pump 41, and the signal from the sensor is output to the dilution water production device 30 and the coolant stock solution pump 41 as an output signal. To communicate and activate them. The coolant production apparatus shown in FIG. 12 can be provided with additional equipment as shown in the figure. For example, the operation of the coolant stock solution pump 41 may be controlled by a switch (not shown). Further, a dilution water supply valve 31 can be provided in a water supply pipe for the dilution water 30a from the dilution water production device 30 to the mixing tank 51. Furthermore, when the predetermined dilution ratio changes due to evaporation of water, etc. In order to dilute the liquid in the coolant tank 91 of the processing machine, a water supply pipe (bypass) for introducing dilution water directly from the dilution water production device 30 into the coolant tank 91 of the processing machine Line), and a dilution water supply valve 32 can be provided there. In this case, for example, the coolant liquid 300a from the coolant liquid metering pump 54 and the dilution water 300a from the water supply pipe can be selectively supplied to the coolant liquid tank 91. These pumps can be provided with switching switches (not shown) and can be spilled. Furthermore, a coolant liquid metering pump for supplying the coolant 300 a to the coolant tank 91 of the processing machine 90.

54 can also be controlled by contacting the control circuit.

In the case of first supplying a predetermined amount of the full amount to the coolant tank of the processing machine when the water is full, or replacing the entire amount of the coolant (so-called “sticking mode”), a predetermined dilution is performed by the coolant manufacturing apparatus of the present invention. The coolant liquid adjusted to the magnification can be supplied to a predetermined amount when the water is full through the coolant liquid metering pump.

In addition, when the coolant is scattered, taken out, or evaporated from the coolant tank in the coolant tank, a certain amount of coolant decreases from a predetermined amount when the water is full (so-called, In the case of the additional mode, the liquid supply start liquid amount sensor 61 detects the insufficient liquid amount, and the signal is input to the control circuit 60. The input signal is transmitted as an output signal from the control circuit 60 to the dilution water producing device 30 and the coolant undiluted solution pump 41. By operating the coolant liquid quantitative pump 54 by a switch (not shown) (or by a signal when communicating with the control circuit 60), the coolant liquid 300a is cooled by the coolant in the processing machine. It can be supplied to the liquid tank 91. When a predetermined amount of coolant is supplied to the coolant tank 91, the full-water sensor 61 detects it and the signal is sent to the control circuit.

Transmitted to 60. The coolant supply is stopped by deactivating the coolant metering pump 54 by means of a switch (not shown) (or by its signal, if it is communicated with the control circuit). On the other hand, while the coolant is being supplied, the output signal from the control circuit 60 also operates the dilution water producing device 30 and the coolant undiluted solution pump 41 to produce the diluted water 30 a is the dilution water supply Through the valve 31 and the coolant stock solution 40a are sent to the mixing tank 51 via the coolant stock solution pump 41, where the production of the coolant solution is started. In this way, the coolant liquid can be automatically supplied directly from the coolant liquid production apparatus according to the decrease in the coolant liquid tank volume of the processing machine.

FIG. 13 is a diagram schematically showing an arrangement of another example of the coolant liquid producing apparatus in which the above-described control circuit is added to the coolant liquid producing apparatus shown in FIG. Fig. 14 shows the coolant liquid production system shown in Fig. 13 and the control circuit as described above, and the dilution water as shown in Fig. 12 directly from the dilution water production system 30. FIG. 9 is a view schematically showing another example of the arrangement of a coolant liquid production apparatus provided with a water supply pipe that can be introduced into the apparatus shown in FIG. In any of the coolant production apparatuses 400 and 500 shown in FIGS. 13 and 14, the configuration of the coolant production apparatus shown in FIG. 12 is basically the same as that of FIG. Since the above-mentioned direct mixing type mixing apparatus is used, it is possible to design more compactly.

In the coolant production apparatus of the present invention, as described above, the coolant supplied when the coolant volume of the coolant tank of the processing machine decreases from the predetermined fluid volume when the machine is full, and the coolant fluid at the time of addition are diluted. It is preferably prepared using dilute water containing a high concentration of hydrogen peroxide-containing active oxygen obtained by reducing the amount of water produced per unit time from a water producing apparatus. When adding the coolant liquid, the coolant liquid for the addition is not required in a large amount. Therefore, in the dilution water production equipment, the amount of water passing therethrough can be set to be smaller than that in the case of the initial supply that requires a large amount. Can be produced. As a result, it is possible to replenish a coolant liquid having a higher anti-rot effect.

The coolant production apparatus of the present invention may further include a periodic timer circuit so that coolant can be supplied periodically. FIG. 15 is a diagram schematically illustrating an arrangement of an example of a coolant liquid production apparatus in which a periodic timer circuit is added to the coolant liquid production apparatus of FIG. 13. As shown in the figure, the coolant timer 600 can be supplied to the coolant tank 91 of the processing machine 90 periodically by providing the periodic timer circuit 70. However, in order to control such periodic supply, it is necessary to It is preferable that the coolant liquid from one coolant tank 91 is reduced at a substantially constant rate. Therefore, a coolant drain pipe 92 is separately provided in the coolant tank 91, and a coolant drain valve 9 is provided. Preferably, 3 is provided so that its opening and closing can be controlled by the signal of the periodic timer circuit 70. It is preferable that the connection between the periodic timer circuit 70 and the coolant liquid drain valve 93 be made easy to release by using, for example, a plug. Thereby, the coolant production apparatus 600 of the present invention can be mounted on the processing machine 90, or the processing machine can be easily detached from the apparatus. In addition, it is also possible to integrate the coolant liquid tank of the processing machine with the coolant production apparatus of the present invention, and to attach these integrated devices to the processing machine. A coolant timer manufacturing apparatus shown in FIG. 14 can also be provided with a periodic timer circuit. Further, in the coolant liquid production apparatus shown in FIG. 15, the mixing apparatus can be replaced with a mixing apparatus having a mixing tank shown in FIG.

In such an apparatus, the coolant in the coolant tank of the processing machine can be changed at an arbitrary time interval (1 day to 15 days), for example, by the periodic timer circuit. When replacing the coolant, the replacement amount can be set in a range of 10 to 50% reduction from the predetermined amount when the tank is full as described above.

[Best Mode for Carrying Out the Invention]

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Dilution water was produced using the dilution water production apparatus of the present invention. Table 1 shows the properties of the produced dilution water. The dilution water 1 and 2 use the device shown in Fig. 1, the dilution water 3 and 4 use the device shown in Fig. 5, the dilution water 5 and 6 use the device shown in Fig. 6, and the dilution water 7 and 8 use Each sample was generated using the device described in Fig. 8. The cathode feeder 14 constituting the cathode 3 was made of stainless steel, the gas diffusion electrode 17 was made of GDE manufactured by E-TEK, USA, and the anode 4 was made of titanium plated with platinum. For water, pass tap water through a water softener to reduce the calcium ion concentration and magnesium ion concentration to 0.05 mm o. One having a value of 1 Z dm ³ or less was used. Air was introduced from the air supply section.

Table 1 also shows, for comparison, the properties of the dilution water (dilution water 9 = normal water) and the cathode when the dilution water was produced without applying voltage in the above dilution water production equipment. The properties of the dilution water when the dilution water is produced using a dilution water production device that uses ordinary stainless steel tubes without graphite and nickel plating, (Dilution water 10 = electrolytic alkaline ionized water) Also shown. A hydrogen peroxide test paper (Peroxide Test, manufactured by MERCK) was used to measure the hydrogen peroxide concentration, and a pH meter (CP-1PT, manufactured by Az One) was used to measure the pH. table 1

In addition, the cathode feeder of the devices described in FIGS. 1, 5, 6, and 8

Instead of Chinore, use stainless steel with nickel plating, titanium with platinum plating, titanium with iridium plating, and titanium with platinum iridium plating, and use platinum plating on the anode. In the case where titanium coated with platinum or titanium coated with platinum is used in place of titanium, the quality of the obtained dilution water is equivalent to dilution water 1 to dilution water 8 shown in Table 1. Met. Next, coolant was manufactured using a coolant manufacturing system (see Fig. 13). In the production of the coolant liquid, the dilution water and water-soluble metal working oil (Emulsion-type N-Solpur EM manufactured by Nippon Oil Co., Ltd.) were manufactured under the same conditions as those for dilution water 1 to 10 shown in Table 1 above. And was performed. Table 2 shows the properties of the manufactured coolant. Table 2

Here, the coolant liquids 1, 3, 5, and 7 are used for the filling mode described above, and the coolant liquids 2, 4, 6, and 8 are used for the additional mode. The coolant 9 is a so-called ordinary coolant, and the coolant 10 is a coolant diluted with electrolytically deionized water.

A beaker test was carried out on the propagation of the bacteria in the obtained coolant liquids 1 to 10.

30 OmL of the coolant liquids 1, 3, 5, and 7 were added to a beaker, and the mixture was left at 30 ° C while being stirred on a magnetic stirrer. Since the top of the beaker is open and the coolant gradually decreases due to evaporation, coolant 2, 4, 6, and 8 were added twice a week. Every few days, the number of general bacteria is measured based on the standard agar plate culture method, and the number of days required for the number of bacteria to exceed 1 million Considering the life of the runt, it was used as an evaluation standard. For comparison, the same test was performed for the coolants 9 and 10 in Table 2. The results are shown in Table 3. Table 3

As is evident from the results shown in Table 3, the coolant of the present invention (Example 1) has a 2.8 times longer life than the normal coolant (Comparative Example 1). The service life is extended more than 1.6 times even with the coolant liquid (Comparative Example 2) diluted with the electrolytic water containing no hydrogen (Comparative Example 2). Further, in the present invention, the coolant liquid having a higher hydrogen peroxide concentration (Examples 2 to 4) has a life extension of 7.3 times or more as compared with Comparative Example 1 and 4.2 times or more as compared with Comparative Example 2. Is shown.

Next, the entire amount of the coolant shown in Table 2 was supplied to an actual machining center (cutting machine, Mitsubishi Heavy Industries, Ltd. M-V600C, tank capacity: 200 L) (initial supply: The number of days required to generate odors was confirmed. Coolant liquids 1, 3, 5, and 7 were used for filling, and coolant liquids 2, 4, 6, and 8 were used for adding. For comparison, the same type of machining center was filled with coolant 9 diluted with normal water. The air generated by bubbling the coolant after 0 to 100 days has elapsed is measured by an odor measuring instrument (Creation Systems Co., Ltd. C-GC-329 High-sensitivity tin oxide, hot-wire sintered semiconductor sensor) And digitized. Table 4 shows the evaluation results. Table 4

From the results shown in Table 4, the odor level of the coolant of the present invention (Example 5) was about 1/8 after 100 days with respect to the normal coolant (Comparative Example 3). It is about 1Z14 to 1/16 compared to Example 3, indicating that it is very effective in preventing odor.

A test was conducted in which only the dilution water was added to the coolant tank at the machining center using the dilution water supply valve 32 using the dilution water bypass line of the coolant production system shown in Fig. 14. The change in the number of bacteria in one liquid was observed. Table 5 shows the results. Table 5

From the results shown in Table 5, the number of bacteria in the coolant liquid of the machining center before the addition was all 10 ⁶ cells / mL or more, but the number of bacteria in any dilution water was increased by adding the dilution water. Although it decreases, the dilution water 2, 4, produced by the dilution water production apparatus of the present invention 6 and 8 (Examples 9 to 12) show a high reduction rate. [Industrial applicability]

The dilution water of the present invention does not adversely affect the human body and the environment, and does not adversely affect the oil agent and its processing performance. Therefore, by using the dilution water of the present invention, it is possible to produce a coolant liquid having a high durability and an excellent rot preventing effect without reducing the processing performance. Further, the dilution water producing apparatus of the present invention can efficiently produce a large amount of dilution water. Further, in the coolant production apparatus of the present invention, a coolant having a high pH can be obtained without adding an alkaline reagent (for example, Na salt) or the like, so that maintenance is easy and not only the coolant 1 but also the coolant Since Na salt and the like do not precipitate, there is almost no decrease in the processing performance of the coolant liquid from this point.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a vertical cross section of an example of the apparatus for producing a dilution water of a water-soluble metal working oil agent of the present invention.

FIG. 2 is a diagram schematically showing the manufacturing apparatus of FIG. 1 as viewed from above.

FIG. 3 is a diagram schematically showing the manufacturing apparatus of FIG. 1 as viewed from below.

FIG. 4 is a perspective view schematically showing a cathode of the manufacturing apparatus of FIG.

FIG. 5 is a view schematically showing a vertical cross section of another example of the water-soluble metal working oil dilution water producing apparatus of the present invention.

FIG. 6 is a diagram schematically showing a vertical cross section of another example of the water-soluble metal working oil dilution water producing apparatus of the present invention.

Figure 7 shows the specific shape of the perforated cathode feeder or anode used in Figures 5 and 6.

It is a figure showing three examples.

FIG. 8 is a diagram schematically showing a vertical cross section of another example of the water-soluble metal working oil dilution water producing apparatus of the present invention.

FIG. 9 is a diagram schematically showing the manufacturing apparatus of FIG. 8 as viewed from above.

FIG. 10 is a diagram schematically showing an arrangement of an example of a coolant production apparatus of the present invention. You.

FIG. 11 is a diagram schematically showing an arrangement of another example of the coolant production apparatus of the present invention.

FIG. 12 shows a coolant liquid manufacturing apparatus according to the present invention, which is provided with a control circuit for controlling the amount of the coolant tank in the processing machine to a predetermined amount in the coolant liquid manufacturing apparatus shown in FIG. It is a figure which shows an example arrangement | positioning typically.

FIG. 13 shows another example of the coolant liquid manufacturing apparatus of the present invention in which a control circuit for controlling the amount of the coolant tank in the processing machine to a predetermined amount is added to the coolant liquid manufacturing apparatus shown in FIG. It is a figure which shows an example arrangement | positioning typically.

Fig. 14 shows another example of the coolant production system of the present invention, which is equipped with the coolant production system shown in Fig. 13 and a water supply pipe that can directly introduce dilution water from the dilution water production system into the coolant reservoir in the processing machine. It is a figure which shows the example of arrangement | positioning typically.

FIG. 15 is a diagram schematically showing an arrangement of an example of a coolant liquid producing apparatus in which a periodic timer circuit is further added to the coolant liquid producing apparatus of the present invention shown in FIG.

Claims

The scope of the claims

1. Dilution water of a water-soluble metalworking oil obtained by electrolysis of water and having a pH of 8 or more and 13 or less and containing active oxygen containing hydrogen peroxide at a concentration of lmg / or more.

2. A cathode composed of a stainless steel cathode feeder and an electrode made of a carbon-based material, and an anode made of platinum and titanium plated with Z or iridium are separated by a diaphragm and face each other. An electrolysis apparatus including an electrolytic cell provided with an air supply unit for supplying a gas containing air or oxygen to the cathode surface and a water supply port for introducing water. By applying a voltage to both electrodes to electrolyze the water introduced into the electrolytic cell, water containing active oxygen containing hydrogen peroxide with a pH of 8 or more and 13 or less and a concentration of lmg / L or more can be obtained. For producing a dilution water of a water-soluble metal working oil for producing water.

3. The apparatus for producing dilution water according to claim 2, wherein the cathode has a structure in which graphite is adhered to a cathode power supply body made of nickel-plated stainless steel.

4. The electrolytic cell has a vertical cylindrical shape, and is formed in a concentric circle at a distance from the diaphragm in the order of the cathode, the diaphragm, and the anode from the inside to the outside in the radial direction. Further, a water supply port is provided between the diaphragm and both electrodes, and an air supply section is provided at a lower portion of the tank between the cathode and the diaphragm, and the air supply section has a plurality of air diffusion holes and is formed in a hollow tubular shape. 4. The apparatus for producing dilution water according to claim 2, wherein the dilution water is formed and spirally extends upward along the cylindrical cathode surface.

5. Cathode feeder with holes made of stainless steel, stainless steel with nickel plating, or titanium with plating with platinum or Z or iridium, and gas diffusion electrode made of carbon-based material Shade composed of A pole and an anode made of platinum and / or titanium coated with a diaphragm are separated by a diaphragm and provided to face each other, and a gas containing air or oxygen is provided on the cathode surface side opposite to the diaphragm. An electrolyzer comprising an electrolytic cell having an air supply section for supplying water and a water supply port for supplying water to a cathode chamber between the cathode and the diaphragm. By applying a voltage to electrolyze water introduced into the electrolytic cell, water with a pH of 8 or more and 13 or less and containing active oxygen containing hydrogen peroxide at a concentration of SOmg / X or more is produced. For the dilution of water-soluble metal working oil

6. Perforated cathode feeder made of stainless steel, stainless steel with nickel plating, or titanium with plating with platinum and / or aluminum, and gas diffusion formed with carbon-based material A hollow cylindrical cathode composed of electrodes and an anode made of platinum and titanium plated with Z or iridium are separated by a diaphragm, and provided so as to face each other. The cathode has a structure in which a cathode feeder with a hole is arranged on the inside and a gas diffusion electrode is arranged on the outside, and a supply for supplying air or oxygen-containing gas to the inside of the cathode hollow. And an electrolytic cell including an electrolytic cell having a gas supply portion and a water supply port for supplying water to the cathode chamber between the cathode outer portion and the diaphragm. A voltage is applied to both electrodes of the device. And electrolyzes the water introduced into the electrolytic cell to produce water containing hydrogen peroxide-containing active oxygen at a pH of 8 or more and 13 or less and a concentration of 50 mg / L or more. Equipment for producing water dilution for water-soluble metal working oils.

7. A coolant liquid obtained by mixing dilution water of the water-soluble metal working oil according to claim 1 with a water-soluble metal working oil.

8. A coolant production apparatus comprising: the dilution water production apparatus according to any one of claims 2 to 6; and a mixing apparatus for mixing the dilution water produced by the apparatus with a water-soluble metal working oil. When the amount of the coolant in the processing machine for automatically supplying the produced coolant to the processing machine decreases from the predetermined amount when the water is full. A liquid supply start liquid level sensor that sends a supply signal, a full liquid level sensor that sends a supply stop signal when the coolant level in the processing machine is full, and a liquid supply start liquid level sensor and a full liquid level sensor And a control circuit for controlling a signal of the coolant.

9. The coolant liquid to be supplied when the amount of the coolant decreases from the predetermined liquid level when it is full is high concentration excess liquid obtained by reducing the amount of water produced per unit time from the dilution water production equipment. 9. The coolant liquid production apparatus according to claim 8, wherein the apparatus is prepared using dilution water containing active oxygen containing hydrogen oxide.