WO2007113915A1 - 液質制御方法、液質制御装置、およびこれを用いた放電加工装置 - Google Patents
液質制御方法、液質制御装置、およびこれを用いた放電加工装置 Download PDFInfo
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- WO2007113915A1 WO2007113915A1 PCT/JP2006/307251 JP2006307251W WO2007113915A1 WO 2007113915 A1 WO2007113915 A1 WO 2007113915A1 JP 2006307251 W JP2006307251 W JP 2006307251W WO 2007113915 A1 WO2007113915 A1 WO 2007113915A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/10—Supply or regeneration of working media
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/36—Supply or regeneration of working media
Definitions
- the present invention controls the quality of the used aqueous processing liquid used for the electric discharge power or the quality of the stock solution used as the raw material of the aqueous processing liquid used for the electric discharge machining.
- the present invention relates to a liquid quality control method for preparing a water-based machining fluid for use, a liquid quality control device based on the method, and a discharge cache device using the same.
- an electric discharge machining apparatus such as a wire electric discharge machining apparatus or a sculpture electric discharge machining apparatus used for precision machining such as die machining
- these are performed under a state in which a machining fluid is interposed between a machining electrode and a workpiece.
- a high-frequency pulse voltage is applied to the machining electrode and the workpiece, and the workpiece is cut by a small amount by the electric discharge generated at this time, and then the workpiece is formed into a desired shape.
- the machining fluids used in this discharge cache device can be broadly classified into insulating oil-based machining fluids and aqueous-based machining fluids.
- Water-based processing systems have a higher cooling capacity than insulating oil-based processing fluids, so it is easy to improve the processing speed of electrical discharge processing equipment.
- the processing fluid is generally recycled instead of being disposable.
- metal ions generated from the machining electrode and workpiece force during electrical discharge machining or components in the atmosphere will be contained in the machining fluid, so the quality of the fluid is It will be different from the quality of the unused machining fluid.
- the quality of the coating liquid is controlled so that the (specific resistance) is within a predetermined range.
- the hydrogen ion concentration is also controlled according to the material of the workpiece so as not to corrode the workpiece.
- Patent Document 3 describes that in performing wire electric discharge machining of iron-based metals, carbonate ions, bicarbonate ions and hydroxides together with nitrite ions.
- the corrosive ion is increased without increasing the conductivity of the machining fluid.
- a method for preventing corrosion of iron-based metals to be removed is described.
- Patent Document 4 a tetrazole compound and a water-soluble metal anticorrosive agent that also has salt power are added to water to prevent the corrosion of cemented carbide materials and metal materials. A method has been proposed.
- Patent Document 1 Japanese Patent Laid-Open No. 63-191514
- Patent Document 2 Japanese Patent Laid-Open No. 4-141319
- Patent Document 3 Japanese Patent Laid-Open No. 2002-301624
- Patent Document 4 Japanese Patent Laid-Open No. 7-145491
- Patent Document 3 since the method described in Patent Document 3 does not change the conductivity (conductivity), it can be obtained by applying the method in recycling the used aqueous processing liquid.
- the conductivity of the working fluid may be outside the desired range.
- the method described in Patent Document 3 is effective in preventing the corrosion of passivated metals such as ferrous metals.
- passivated metals such as ferrous metals.
- metal materials that are not passivated such as cemented carbide and copper (Cu)
- the anticorrosion effect cannot be expected because nitrite ions promote corrosion.
- Patent Document 4 The water-soluble metal anticorrosive described in Patent Document 4 is trapped by an ion-exchange resin that is generally used when reusing the aqueous machining fluid of an electrical discharge machining apparatus, so it is added to the machining fluid. However, its concentration decreases during the recycling process, and sufficient anti-corrosion effect cannot be exhibited.
- the present invention has been made in view of the above, and a liquid quality control method and liquid quality control capable of preparing an aqueous processing liquid having a desired liquid quality used for discharging power at low cost.
- An object is to obtain a device and an electric discharge machining device.
- the liquid quality control method for a machining fluid provides the liquid quality of a used aqueous machining fluid used for electric discharge machining, or the quality of an undiluted solution used as a raw material for an aqueous machining fluid used for electric discharge power.
- This is a liquid quality control method that changes the quality of the water-based machining fluid for electrical discharge machining, and includes a liquid quality measurement process for determining the liquid quality value of the liquid control liquid to be subjected to liquid quality control, and a liquid quality measurement process.
- the obtained liquid quality value is smaller than the first condition value, the impurity anion in the liquid control liquid is replaced with a predetermined anion, and the impurity cation in the liquid control liquid is replaced with a predetermined value.
- liquid quality control process for purifying the control liquid, and repeating the liquid quality measurement process and the liquid quality control process.
- the liquid quality value of the liquid control liquid is set to a value within a predetermined range, and the liquid of the liquid control liquid is an electrolyte solution having a correlation between pH and conductivity.
- the liquid quality control device of the present invention controls the liquid quality of a used aqueous machining liquid used for electric discharge machining or the quality of an undiluted solution used as a raw material for an aqueous machining liquid used for electric discharge machining.
- a liquid quality control device for preparing an aqueous machining fluid for electric discharge machining, a liquid quality measurement unit for obtaining a liquid quality value of the liquid quality control liquid to be liquid quality controlled, and a liquid quality control liquid The impurity anion is replaced with a predetermined anion, and the impurity cation in the liquid control liquid is replaced with a predetermined metal ion, so that the liquid quality of the liquid control liquid is between pH and conductivity.
- Electrolyte solubilizing part to make an electrolyte solution that has a correlation with water and pure water purifying part that purifies liquid control liquid A first liquid control liquid supply means for supplying the liquid control liquid to the electrolyte solution converting section or the pure water purification section, and the first liquid quality according to the liquid quality value obtained by the liquid quality measuring section.
- a control unit for controlling the operation of the control liquid supply means, and the control unit stores a first condition value for the liquid quality value and a second condition value equal to or greater than the first condition value.
- the discharge cache device of the present invention applies a high-frequency pulse voltage to the machining electrode and the workpiece while the aqueous machining fluid is interposed between the machining electrode and the workpiece.
- a processing machine body that processes a workpiece by electric discharge generated between the processing electrode and the workpiece, a control device that controls the operation of the processing machine body, and a septic tank in which used aqueous processing liquid is stored
- a liquid quality control device that prepares an aqueous machining fluid by controlling the quality of the used aqueous machining fluid or the quality of the raw solution that is the raw material of the aqueous machining fluid
- the liquid quality control device includes a liquid quality measuring unit for obtaining a liquid quality value of a liquid control liquid to be liquid quality controlled, and replacing an impurity anion in the liquid control liquid with a predetermined anion.
- the impurity cation in the liquid control liquid is replaced with a predetermined metal ion to control the liquid quality.
- Electrolyte solution section that converts the liquid quality into an electrolyte solution that has a correlation between pH and conductivity
- a pure water purification section that purifies the liquid control liquid
- the liquid control liquid as the electrolyte Controls the operation of the first liquid control liquid supply means supplied to the liquefying section or the pure water purification section and the first liquid control liquid supply means according to the liquid quality value obtained by the liquid quality measurement section.
- control unit wherein the control unit stores a first condition value for the liquid quality value and a second condition value greater than or equal to the first condition value, a first condition value and A liquid quality control unit that controls the operation of the first liquid quality control liquid supply means according to the magnitude relationship between each of the second condition values and the liquid quality value obtained by the liquid quality measurement unit. It is a feature.
- the liquid quality measurement process and the liquid quality control process described above are repeated, and the liquid quality value of the liquid control liquid to be subjected to liquid quality control is determined in advance.
- the liquid control solution is an electrolyte solution that has a correlation between pH and conductivity.
- the conductivity of the liquid quality control liquid can also be controlled.
- the pH of the liquid control liquid can also be controlled by controlling only the conductivity of the liquid control liquid.
- liquid quality control device and the electric discharge machining device of the present invention each prepare an aqueous machining fluid based on the above-described liquid quality control method, the desired liquid quality used for the electric discharge machining.
- V or the difference between the conductivity measuring means and the pH measuring means can be omitted.
- FIG. 1 is a graph showing the relationship between pH and conductivity in an aqueous solution of sodium hydroxide (NaOH).
- FIG. 2 is a configuration diagram schematically showing an example of the liquid quality control device of the present invention.
- FIG. 3 is a graph showing an example of changes over time in pH and conductivity when preparing a tap water-powered aqueous working fluid by the liquid quality control device shown in FIG.
- FIG. 4 shows that in the liquid quality control apparatus according to the present invention, each of the electrolyte solution tank section and the purified water section has a predetermined cation exchange resin tower and a predetermined anion exchange resin tower. It is a block diagram which shows roughly an example of the liquid quality control apparatus comprised by arrange
- FIG. 5 is a configuration diagram schematically showing an example of a liquid quality control apparatus including an electrolyzed water production unit in the liquid quality control apparatus of the present invention.
- FIG. 6 is a block diagram schematically showing a configuration of an electric discharge machining apparatus according to the present invention.
- FIG. 7 is a block diagram schematically showing an example of an electric discharge machining apparatus according to the present invention.
- FIG. 8 is a flow chart showing the operation of the liquid quality control device in the electric discharge machining apparatus shown in FIG. [FIG. 9]
- FIG. 9 shows the pH value of the liquid quality measurement unit when the liquid quality control device operates according to the flowchart shown in FIG. 8 and the operating states of the electrolyte solution conversion unit and the pure water purification unit. It is a chart which shows correspondence as a list.
- FIG. 10 is a block diagram schematically showing another example of the electric discharge machining apparatus according to the present invention.
- FIG. 11 is a flowchart showing the operation of the liquid quality control apparatus in the electric discharge machining apparatus shown in FIG.
- FIG. 12 shows the pH value by the liquid quality measurement unit when the liquid quality control device operates according to the flowchart shown in FIG. 11, the electrolyte solution conversion unit, the pure water purification unit, and the OH-generation unit. It is a chart which shows the correspondence with each operation state as a list.
- FIG. 13 is a configuration diagram schematically showing still another example of the electric discharge machining apparatus of the present invention.
- FIG. 14 is a flowchart showing the operation of the liquid quality control apparatus in the electric discharge machining apparatus shown in FIG.
- FIG. 15 shows the pH value by the liquid quality measurement unit when the liquid quality control device operates according to the flowchart shown in FIG. 14, and the electrolyte solution conversion unit, the pure water purification unit, and the electrolytic water production unit. It is a chart which shows the correspondence with each operation state as a list.
- the liquid quality control method uses a liquid quality of a used aqueous machining fluid used for electric discharge machining, or a liquid quality of an undiluted solution used as a raw material for an aqueous machining fluid used for electric discharge power for an electric discharge cabinet.
- This is a liquid quality control method that changes the liquid quality of the aqueous processing liquid.
- the liquid quality control liquid is made a predetermined electrolyte solution. This makes it possible to reduce the cost required for the preparation of the aqueous processing liquid.
- this liquid quality control method includes a liquid quality measurement process for determining the liquid quality value of the liquid control liquid and a liquid quality control process for controlling the liquid quality value of the liquid control liquid.
- a liquid quality measurement process for determining the liquid quality value of the liquid control liquid
- a liquid quality control process for controlling the liquid quality value of the liquid control liquid.
- the pH value of the liquid control liquid that is the target of liquid quality control is obtained.
- this value can be obtained by a conventional method using a pH meter or the like, it is preferable to automatically measure the power for automating the liquid quality control by an electrical method.
- the pH value is measured directly.
- measure the hydroxide ion concentration and calculate the hydroxide ion concentration force is preferable.
- the impurity anions in the liquid quality control liquid are replaced with predetermined anions and
- the impurity cation in the liquid quality control liquid is replaced with a predetermined metal ion, and the liquid control liquid is changed to a predetermined electrolyte solution, that is, an electrolyte solution having a correlation between pH and conductivity.
- the pH value obtained in the liquid quality measurement step is larger than the second condition value, the liquid control liquid is purified. This liquid quality control step and the above-described liquid quality measurement step are performed periodically or continuously in parallel.
- Each of the first condition value and the second condition value is a range of pH values that are acceptable for the aqueous processing liquid to be obtained, and The quality can be appropriately selected according to the performance of the equipment used to control the quality of the quality control liquid, the amount of the liquid quality control liquid, and the like. At this time, the first condition value and the second condition value may be set to the same value, or may be set to different values.
- WC tungsten carbide
- Co cobalt
- Cu copper
- Fe iron
- Zn zinc
- the workpiece is easily corroded by the aqueous machining fluid if the pH of the aqueous machining fluid is less than 8.5, and if the pH exceeds 10.5, the conductivity of the aqueous machining fluid is high. Therefore (for example, exceeding 70 SZcm), the stability of the discharge tends to be reduced during discharge caching.
- the pH value of the liquid control liquid should be in the range of 8.5 to 10.5. It is preferable to appropriately select the first condition value and the second condition value.
- the electrical conductivity of the aqueous processing liquid is preferably about 3 to 63 / z SZcm.
- the electrolyte solution described above includes, for example, an ion exchange resin tower filled with a mixture of a cation exchange resin and an anion exchange resin, or an area filled with a cation exchange resin and an anion exchange resin. It can be carried out by supplying a liquid quality control solution to an ion exchange resin tower arranged in series or in parallel with the packed region.
- Examples of the cation exchange resin include alkali metal ion cation exchange resins such as Na + form and K + form, and alkaline earth metal ion cation exchange resins such as Ca 2+ form.
- alkali metal ion cation exchange resins such as Na + form and K + form
- alkaline earth metal ion cation exchange resins such as Ca 2+ form.
- anion exchange resin for example, OH-type anion exchange resin can be used.
- a hydroxide solution is generated from the liquid control liquid.
- the above-described dehydration performed when the pH value obtained in the liquid quality measurement step is larger than the second condition value can be performed using, for example, an ion exchange resin.
- the purification of a liquid control solution using ion exchange resin can be performed by, for example, an ion exchange resin tower filled with a mixture of H + type cation exchange resin and OH- type anion exchange resin, This can be carried out by supplying the liquid control liquid to an ion exchange resin tower in which the region filled with the exchange resin and the region filled with the anion exchange resin are arranged in series or in parallel.
- the liquid quality measurement step and the liquid quality control step described above are repeated so that the pH of the liquid quality control solution is set to a value within a predetermined range, and the liquid quality is controlled.
- the control solution is made into an electrolyte solution that has a correlation between pH and conductivity.
- an aqueous processing liquid is prepared.
- the conductivity of the hydroxide solution is regulated by the concentration of OH-, so that the conductivity is controlled only by controlling the pH. It becomes possible to prepare an alkaline aqueous processing liquid with a controlled rate.
- an aqueous solution of sodium hydroxide (NaOH) which is one of the hydroxide solutions
- NaOH sodium hydroxide
- the electrical conductivity can be calculated
- Fig. 1 is a graph showing the relationship between pH and electrical conductivity in aqueous NaOH solution. In the figure, the horizontal axis shows the pH of NaOH aqueous solution, and the vertical axis shows the electrical conductivity of NaOH aqueous solution.
- an aqueous processing liquid with controlled conductivity can be prepared only by controlling the pH of the liquid control liquid. Therefore, it is possible to prepare an aqueous machining fluid that has high discharge stability during electric discharge machining and that does not easily corrode the workpiece without measuring the conductivity of the liquid quality control solution during the liquid quality control process. It becomes possible. Since the means for measuring conductivity such as a conductivity meter is not required, the equipment used for liquid quality control can easily reduce the manufacturing cost or running cost of the equipment equipped with the equipment.
- the deionization in the liquid quality control step is preferably performed such that a predetermined amount of impurity ions remain in the liquid after deionization (ion-exchanged water).
- ion-exchanged water ion-exchanged water
- the unused aqueous processing liquid that has not been recycled is generally prepared by adjusting the components of fresh water such as tap water, industrial water, and groundwater.
- fresh water such as tap water, industrial water, and groundwater.
- an aqueous processing solution having a desired pH and conductivity can be prepared by performing the above-described electrolyte solution thereafter. Since it is recycled, no special equipment is required to prepare the unused aqueous machining fluid, so it is easy to reduce the cost required for constructing electrical discharge machining equipment.
- the amount of impurity ions remaining in the purified liquid (ion-exchanged water) is appropriately selected according to the target pH value so that an electrolyte solution having a desired pH can be obtained by the subsequent electrolyte solution. Is done.
- the liquid control liquid is electrolyzed and the electric component as necessary.
- a sub-step of adding the alkaline water generated by the solution to the liquid quality control solution can be further included. By including this sub-process, the following technical effects can be further obtained.
- the pH value of the liquid quality control solution and the aqueous machining fluid can be set even if electric discharge machining is performed! / Even when it is low, the power is gradually reduced by the dissolution of carbon dioxide in the atmosphere.
- This change in liquid quality can be handled by performing the liquid quality control process described above. It is possible to respond by performing the above sub-process instead of. As a result, it is easy to reduce the cost required to prepare a water-based processing liquid having a desired liquid quality.
- the pH value of the liquid control liquid is relatively large because the pH value of the alkaline water is relatively large.
- condition value which is the criterion for determining whether or not to subject the control liquid to electrolysis, to the same value as the first condition value, depending on the performance of the equipment used for the electrolysis. It can also be set to a value different from the first condition value.
- the liquid quality control device is used as the raw material for the used aqueous machining fluid used for electric discharge machining or the aqueous machining fluid used for electric discharge machining based on the liquid quality control method of the present invention described above.
- the aqueous processing liquid is prepared by controlling the liquid quality of the stock solution, and includes a liquid quality measurement unit, an electrolyte solution conversion unit, a pure water purification unit, a first liquid control liquid supply unit, and a control unit. .
- the following is a liquid quality control apparatus based on the liquid quality control method described in Embodiment 1, wherein the first liquid quality control liquid supply means is configured by a first supply unit and a second supply unit. The apparatus will be described in detail.
- FIG. 2 is a configuration diagram schematically showing an example of the liquid quality control device of the present invention.
- the liquid quality control device 80A shown in the figure includes a processing liquid tank 3 in which the liquid quality control liquid 1 to be subjected to liquid quality control is stored, and a liquid quality control liquid 1 stored in the processing liquid tank 3.
- First supply section 15 and second above The supply unit 25 constitutes a first liquid quality control liquid supply unit.
- the liquid quality control device 80A includes a control unit 70A that controls operations of the first supply unit 15 and the second supply unit 25 according to the pH value obtained by the liquid quality measurement unit 5, and a control unit 70A. And an operation unit 75 for instructing starting and stopping of the unit 70A.
- the liquid quality measuring unit 5 obtains the pH of the liquid control liquid 1 periodically or continuously, and transmits the measurement result to the control unit 70A by wire or wirelessly.
- the electrolyte solution converting section 10A replaces the impurity anions in the liquid control liquid 1 with predetermined anions.
- the impurity cation in the liquid control liquid 1 is replaced with a predetermined metal ion, and the liquid quality of the liquid control liquid 1 is an electrolyte solution having a correlation between pH and conductivity, for example, Make hydroxide solution.
- Such an electrolyte solution section 10A includes, for example, an ion exchange resin tower filled with a mixture of a predetermined cation exchange resin and a predetermined anion exchange resin, or a predetermined cation exchange resin.
- the filled region and the region filled with a predetermined anion exchange resin are constituted by an ion exchange resin tower arranged in series or in parallel.
- Examples of the cation exchange resin include alkali metal ion cation exchange resins such as Na + form and K + form, and alkaline earth metal ion cation exchange resins such as Ca 2+ form.
- alkali metal ion cation exchange resins such as Na + form and K + form
- alkaline earth metal ion cation exchange resins such as Ca 2+ form.
- Na + type cation exchange resin include Amberlite IR120B Na (trade name) manufactured by Rohm and Haas, Diaion SK1B (trade name) manufactured by Mitsubishi Chemical Corporation, etc.
- Examples include styrene-dibutylbenzene copolymer having phenol formalin resin as a base and sulfonic acid groups as ion exchange groups.
- anion exchange resin for example, OH-type anion exchange resin can be used, and specific examples thereof include, for example, Amberlite I RA400J C1 manufactured by Rohm & Haas. Styrene-dibulene benzene copolymer, etc., such as those with (trade name) in OH form, or those made with Mitsubishi Igaku Corporation's Diaion S A10A (trade name) in OH-type, etc.
- the substrate include those having a trimethylammonium group, 13-hydroxyethyldimethylammonium group or the like as an ion exchange group.
- a drain pipe 10a is connected to one end of the electrolyte solution forming unit 10A, and the hydroxide solution generated in the electrolyte solution solution unit 10A is dissolved. The liquid is supplied to the machining liquid tank 3 through the drain pipe 10a.
- the first supply unit 15 includes a pump 11 whose operation is controlled by the control unit 70A, a water intake pipe 12 having one end arranged in the processing liquid tank 3 and the other end connected to the pump 11, and one end being a pump. 11 and the other end of the water supply pipe 13 connected to the electrolyte solution section 10A.
- the operation is controlled by the control section 70A so that the liquid control liquid 1 is supplied to the electrolyte solution section 10A. Supply.
- the pure water purification section 20A purifies the liquid control liquid 1.
- a drain pipe 20a is connected to one end of the pure water purification unit 20A, and the pure water (ion exchange water) generated in the pure water purification unit 20A is supplied to the machining liquid tank 3 through the drain pipe 20a.
- the pure water purification unit 20A is filled with, for example, an ion exchange resin tower filled with a mixture of H + type cation exchange resin and OH- type anion exchange resin, or H + type cation exchange resin. And an area filled with OH-type anion exchange resin is constituted by an ion exchange resin tower arranged in series or in parallel.
- H + type cation exchange resin examples include H + type cation exchange resin having, as a base, styrene-dibutylbenzene copolymer, phenol formalin resin and the like, and having a sulfonic acid group as an ion exchange group. Can be used.
- H + type cation exchange resin examples include the Amberlite IR120B Na (trade name) manufactured by Rohm 'and' Haas, Inc., and the Diaion SK1B manufactured by Mitsubishi Igaku Co., Ltd. (Product name) is H + type.
- the OH-type anion exchange resin the same OH-type anion exchange resin as described in the explanation of the electrolyte solution converting unit 10A can be used.
- the second supply unit 25 includes a pump 21 whose operation is controlled by the control unit 70A, a water intake pipe 22 having one end disposed in the processing liquid tank 3 and the other end connected to the pump 21, and one end pumped And a first water supply pipe 23 connected to the pure water purification unit 20A at the other end, and the operation of the control unit 7 OA is controlled by the control unit 7 OA so that the liquid control liquid 1 is purified 20A.
- a pump 21 whose operation is controlled by the control unit 70A
- a water intake pipe 22 having one end disposed in the processing liquid tank 3 and the other end connected to the pump 21, and one end pumped
- a first water supply pipe 23 connected to the pure water purification unit 20A at the other end
- the control unit 70A includes a storage unit 67 that stores a condition value for the pH value obtained by the liquid quality measurement unit 5, and the pH value obtained by the liquid quality measurement unit 5 and the above-described condition value.
- a liquid quality control unit 68A for controlling the operations of the first supply unit 15 and the second supply unit 25 according to the size relationship is provided.
- the above condition values include the first condition value and the second condition described in the first embodiment. Value is stored. However, when the first condition value and the second condition value are set to the same value, one value is stored as the first condition value and the second condition value.
- the liquid quality control unit 68A compares the pH value obtained by the liquid quality measurement unit 5 with the first condition value stored in the storage unit 67, and the liquid quality measurement unit 5 obtains it.
- the first supply unit 15 is operated, and the liquid control liquid 1 is made into an electrolyte solution by the electrolyte solution supply unit 10A.
- the second supply unit 25 is operated, and the liquid control liquid 1 is purified by the pure water purification unit 20A. .
- the liquid quality measurement unit 5 periodically or continuously obtains the pH of the liquid quality control liquid 1, and the above-described electrolytic solution and pure water purification are performed periodically. Performed continuously, continuously, or intermittently.
- the pH of the liquid control liquid 1 stored in the machining fluid tank 3 is smaller than the first condition value or larger than the second condition value, the pH is automatically reduced. Therefore, the value is controlled within a predetermined range.
- the solution control liquid 1 in the processing liquid tank 3 By controlling the pH, it is possible to prepare an aqueous processing liquid from the liquid quality control liquid 1 that has high discharge stability during electric discharge machining and hardly corrodes the workpiece.
- the liquid quality control device 80A it is not necessary to measure the conductivity with a conductivity meter or the like in the process of controlling the liquid quality of the liquid quality control liquid 1, so the conductivity is measured. Therefore, the cost required for preparing the aqueous processing liquid, the manufacturing cost of the liquid quality control device 80A itself, or the running cost of the liquid quality control device 80A itself can be easily reduced.
- the purification of the liquid control liquid 1 by the pure water purification unit 20A is performed by adding impurity ions to the liquid (ion-exchanged water) after the purification. It is preferable to carry out in such a manner that a predetermined amount remains. Then, when pure water of the liquid control liquid 1 is purified by the pure water purification unit 20A in this way, as shown in FIG. 2, fresh water such as tap water, industrial water, groundwater, etc. is purified.
- One end of the second water supply pipe 24 for supplying to 20A is preferably connected to the pump 21. The other end of the second water supply pipe 24 is connected to the fresh water supply source (not shown).
- the liquid quality control device 80A When the liquid quality control device 80A is configured in this manner, it is possible to prepare an unused aqueous processing liquid that has not been recycled by the liquid quality control device 80A.
- fresh water such as tap water, industrial water, and groundwater, which is the liquid control liquid
- the purified water is supplied to the pure water purification unit 20 through the pump 21 and the first water supply pipe 23, so that a certain amount of impurity ions remain in the pure water purification unit 20A and is purified from the pure water purification unit 20A to become ion exchange water.
- This ion exchange water is stored in the machining liquid tank 3.
- the user of the liquid quality control device 80A operates the operation unit 75 to operate the pump 21 by the control unit 70A prior to the supply of the fresh water.
- potassium ion (K +) is present as an impurity cation in the above-described fresh water, and chlorine ion (impurity anion is present.
- CD the pure water purification unit 20A is configured as V.
- the reaction of the following formula (1) proceeds, and K + is replaced with hydrogen ion (H +), and the OH- form constituting the pure water purification unit 20A
- the reaction of the following formula (2) proceeds and C1— is replaced with OH—
- impurities in the fresh water described above are reduced, but newly added.
- Water (HO) is generated and ion exchange
- the control unit 70A activates the first supply unit 15 to cause the above-mentioned ion exchange water to be electrolyte solution by the electrolyte solution solution unit 10A.
- the electrolyte solution forming unit 10A is configured.
- the reaction of the following formula (3) proceeds, and K + is replaced with sodium ion (Na +).
- the reaction of the following formula (4) proceeds, so that SO 2 is replaced with OH—.
- R represents the substrate in the ion exchange resin.
- Fig. 3 is a graph showing an example of changes over time in pH and electrical conductivity when an aqueous processing liquid is prepared from tap water by the liquid quality control device 80A described above.
- the conductivity of the liquid quality control liquid is shown, and the vertical axis on the right side shows the pH value of the liquid in the processing liquid tank.
- the data shown in the figure is a mixture of Amberlite IR120B Na (trade name) manufactured by Rohm 'and' Haas and OH-type Amberlite IRA400J (trade name) manufactured by the company.
- the electrolyte solution forming part 10A is composed of a mixture of Amberlite IR120B Na (trade name) made by the company in the H + form and OH_ form of the Amberlite IRA400J (trade name) made by the company.
- This is the data when the pure water purification unit 20A is configured using.
- the pH of the tap water used is 6.5 and the conductivity is SZcm.
- only 9.5 is stored as the first condition value and the second condition value in the storage unit 67 constituting the control unit 70A. Since the first condition value and the second condition value are the same value, hereinafter, the first condition value and the second condition value are simply referred to as “condition values”.
- Time t shown in Fig. 3 is the time when the tap water is started to be supplied to the pure water purification unit 20A.
- the liquid quality measuring unit 5 is activated and the pH value of the ion-exchanged water in the liquid tank 3 is set. Since this value is smaller than the condition value, the control unit 70A operates the electrolyte solution unit 10A. As a result, the electrolytic solution (hydroxide solution) of ion-exchanged water in the processing liquid tank 3 starts to progress, and the pH value required by the liquid quality measurement unit 5 increases. When this value becomes larger than the condition value of 9.5, the control unit 70A stops the electrolyte solution forming unit 10A and activates the pure water purification unit 20A, so that the pH value of the ion exchange water decreases. When the pH value is smaller than 9.5, the pure water purification unit 20A is stopped and the electrolyte solution unit 10A is activated again, so that the pH value begins to increase again. After time t, between pH and conductivity
- the aqueous working fluid thus prepared was added to a WC-Co carbide material, copper (Cu), and iron.
- the flow path switching section that selectively switches the flow path of the liquid control liquid between the electrolyte liquefying section side and the pure water purification section side, and the flow path switching section
- the first liquid quality control liquid supply means can also be constituted by a single pump for supplying the liquid quality control liquid.
- each of the electrolyte solution tank part and the purified water part can also be configured by arranging a predetermined cation exchange resin tower and a predetermined anion exchange resin tower in parallel. At this time, one anion exchange resin tower can be shared by the electrolyte solution tank section and the purified water section.
- Fig. 4 shows a solution in which each of the electrolytic solution forming section and the pure water purification section is configured by arranging a predetermined cation exchange resin tower and a predetermined anion exchange resin tower in parallel. It is a block diagram which shows roughly an example of a quality control apparatus. Among the components shown in the figure, the configuration shown in FIG. Components that are the same as those in the elements are given the same reference numerals as those used in FIG.
- the electrolyte solution section 10B is composed of the Na + cation exchange resin column 7 and the OH-type anion exchange resin column 8 arranged in parallel with each other.
- a drain pipe 7a is connected to one end of the Na + type cation exchange resin tower 7, and a drain pipe 8a is connected to one end of the OH-type anion exchange resin tower 8.
- the OH-type anion exchange resin tower 8 and the H + type cation exchange resin tower 17 arranged in parallel with the OH-type anion exchange resin tower 8 are used in the purification unit.
- 20B is configured, and a drain pipe 17a is connected to one end of the H + type cation exchange resin tower 17.
- the OH-type anion exchange resin tower 8 functions as a component of the electrolyte solution converting unit 10B and also functions as a component of the pure water purification unit 20B. That is, the electrolyte solution forming unit 10B and the pure water purification unit 20B share the OH-type anion exchange resin tower 8.
- the cation resin tower that constitutes the electrolyte solution forming section 10B can replace the impurity cations in the liquid control liquid 1 with, for example, metal ions that form hydroxides. It is also possible to use an alkali metal ion type cation exchange resin tower other than the Na + form or an alkaline earth metal ion form cation exchange resin tower.
- the supply of the liquid control liquid 1 to the electrolyte solution forming section 10B and the pure water purification section 20B is performed by the first liquid control liquid supply means 40.
- the first liquid control liquid supply means 40 includes one pump 31 and one flow path switching unit 35.
- the operations of the pump 31 and the flow path switching unit 35 are controlled by a control unit 70B. It is controlled by the liquid quality control unit 68B constituting the.
- One end of the pump 31 is a water intake pipe 32 disposed in the machining liquid tank 3, one end of the first water supply pipe 33 connected to the flow path switching unit 40, and one end of a fresh water supply source (not shown). 2)
- the connected second water supply pipe 34 is connected, and three pipes 36, 37, 38 are connected to the flow path switching unit 35.
- the pump 31 supplies the liquid control liquid 1 in the processing liquid tank 3 or the fresh water to the flow path switching unit 35.
- the flow path switching unit 35 is supplied by the liquid quality control unit 68B.
- the operation is controlled, and the liquid quality control liquid 1 supplied from the pump 31 or the fresh water flow path is switched to the pipe 36, the pipe 37, or the pipe 38.
- Such a flow path switching unit 40 includes, for example, 1 to 3 electromagnetic It can be configured using a valve.
- One end of pipe 36 is connected to Na + cation exchange resin tower 7, one end of pipe 37 is connected to OH-type anion exchange resin tower 8, and one end of pipe 38 is H + cation exchange resin. Connected to Tower 17.
- the liquid quality control liquid in the processing tank 3 is used. 1 or the above fresh water is supplied to the Na + cation exchange resin tower 7 and the OH-type anion exchange resin tower 8 by the first liquid control liquid supply means 40. Ion exchange water containing Na + is generated by the Na + type cation exchange resin tower 7 and supplied to the processing liquid tank 3, and ion exchange water containing OH is produced by the OH-type anion exchange resin tower 8.
- the liquid in the machining liquid tank 3 is The quality control liquid 1 or the above fresh water is supplied to the H + type cation exchange resin tower 17 and the OH-type anion exchange resin tower 8 by the first liquid quality control liquid supply means 40.
- Ion-exchanged water containing H + is generated by the H + -type cation exchange resin tower 17 and supplied to the processing liquid tank 3, and ion-exchanged water containing OH- is generated by the OH-type anion exchange resin tower 8.
- pure water ion-exchanged water
- the pure water purification unit 20A is generated by the pure water purification unit 20A as a result of being supplied to the processing liquid tank 3, so that the liquid control liquid 1 in the processing liquid tank 3 is purified. proceed.
- the liquid quality control device 80B is configured to supply the aqueous processing liquid to each of the configurations of the electrolyte solution forming section and the pure water purification section, and each of the electrolyte solution tank section and the pure water purification section.
- the liquid quality of the liquid quality control liquid 1 in the processing liquid tank 3 is controlled in the same manner as the liquid quality control apparatus 80A shown in FIG. 2 except that the configuration of the liquid quality control liquid supply means is different.
- FIG. 1 When the pH value of the liquid control liquid 1 stored in the processing liquid tank 3 is smaller than the first condition value or larger than the second condition value, FIG. The pH is automatically controlled to a value within a predetermined range as in the liquid quality controller 80A shown. Then, by controlling the pH of the liquid quality control liquid 1 in the machining liquid tank 3, an aqueous processing liquid that has high discharge stability during electric discharge machining and that does not easily corrode the work piece is applied to the liquid quality control liquid. 1 Force can be prepared. Since there is no need to measure the conductivity with a conductivity meter in the process of controlling the liquid quality of the liquid control liquid 1 in the machining fluid tank 3, a means for measuring the conductivity is unnecessary. It is easy to reduce the cost required for preparing the aqueous processing fluid, the manufacturing cost of the liquid quality control device 80B itself, or the running cost of the liquid quality control device 80B itself.
- the pH value of the liquid control liquid stored in the machining fluid tank 3 is, as already explained, dissolved in carbon dioxide in the atmosphere even when electric discharge machining is not performed. It is possible to respond to such a change in liquid quality by supplying the liquid control liquid 1 only to the OH type anion exchange resin tower 8. Become. As a result, it is easy to reduce the cost required to prepare an aqueous processing liquid having a desired liquid quality.
- the condition value (third condition value), which is a criterion for determining whether or not to supply the liquid control liquid 1 only to the OH-type anion exchange resin tower 8 when the electric discharge machining is not performed, is Depending on the performance of the OH "-type anion exchange resin tower 8, it can be set to the same value as the first condition value or a value different from the first condition value.
- the condition value 3 is stored in the storage unit 67 in the same manner as the first condition value and the second condition value.
- an electrolyzed water production section can be provided in addition to the electrolyte solution tank section and the pure water purification section.
- FIG. 5 is a configuration diagram schematically showing an example of a liquid quality control device including an electrolyzed water production unit.
- the liquid quality control device 80C shown in FIG. 5 is supplied to the liquid quality control device 80A shown in FIG. It has a structure with the means 60 attached.
- the same components as shown in Fig. 2 For those that do, the same reference numerals as those used in FIG.
- the electrolyzed water production unit 50 electrolyzes water to produce alkaline water and acidic water.
- the reaction represented by the following formula (5) proceeds and acidic water is produced.
- the reaction represented by the following formula (6) proceeds to generate alkaline water.
- Such an electrolyzed water production unit 50 can be configured by a commercially available electrolyzed water production apparatus such as an alkali & acid ion generator manufactured by Aqua System Co., Ltd., or an alkaline ion water conditioner manufactured by Matsushita Electric Works Co., Ltd. .
- Two drain pipes 52, 53 are connected to the electrolyzed water production section 50, and the alkaline water generated in the electrolyzed water production section 50 passes through the drain pipe 52 to the carpenter liquid tank 3. Supplied. Further, the acid water generated in the electrolytic water production unit 50 may be discarded through the drain pipe 53 or may be stored in a desired storage tank. The acidic water can be used for applications such as neutralizing the liquid control liquid 1 when the liquid control liquid 1 in the processing liquid tank 3 is replaced.
- the second liquid quality control liquid supply means 60 includes a pump 56 whose operation is controlled by the liquid quality control unit 68C constituting the control unit 70C, and one end disposed in the processing liquid tank 3. It has a water intake pipe 57 with one end connected to the pump 56 and a water supply pipe 58 with one end connected to the pump 56 and the other end connected to the electrolyzed water production unit 50, and is operated by the liquid quality control unit 68C. Is supplied to the electrolyzed water production unit 50 of the liquid control liquid 1 in the processing liquid tank 3.
- the pH value obtained by the liquid quality measurement section 5 is the first condition value.
- the control unit 70C liquid quality control unit 68C
- the control unit 70C activates the first supply unit 15 and the second liquid quality control liquid supply means 60.
- the electrolyte solution of the liquid control liquid 1 proceeds.
- the control unit 70C liquid quality control unit 68C 2
- the supply unit 25 is operated, and the liquid control liquid 1 is purified.
- the pH value of the liquid quality control liquid 1 stored in the processing liquid tank 3 is the same as that in the liquid quality control apparatus 80A shown in FIG.
- the pH is automatically controlled to a value within a predetermined range.
- the discharge stability during electric discharge machining is high and the work piece is hardly corroded.
- the electrolyte solution forming unit 10A and the pure water Since the electrolyzed water production unit 50 and the second liquid-substance control liquid supply means 60 that operate each of the control units 20A are operated by the control unit 70C, respectively, it is possible to cope with them. The cost required for preparing a quality aqueous processing fluid can be reduced.
- the condition value (third condition value), which is a criterion for determining whether or not to electrolyze the liquid control liquid when the discharge power is applied, is the value of the equipment used for electrolysis.
- the electrolyte solution forming unit 10A it is possible to shorten the time required for the pH value of the liquid control liquid 1 to exceed the condition value.
- the third condition value is stored in the storage unit 67 in the same manner as the first condition value and the second condition value.
- the electric discharge machining apparatus of the present invention is provided with the liquid quality control apparatus of the present invention described above, and the configuration other than the liquid quality control apparatus is limited as long as the electric discharge machining apparatus requires the liquid quality control apparatus. It ’s not something that ’s done.
- FIG. 6 is a block diagram schematically showing the configuration of the discharge cache device of the present invention.
- the electric discharge machining apparatus 160 of the present invention controls the processing machine main body 120 for electric discharge machining of the workpiece and the operation of the processing machine main body 120 in addition to the liquid quality control apparatus 80 of the present invention described above.
- the apparatus includes a control device 130 and a sewage tank 140 in which used aqueous machining fluid after being used in the processing machine main body 120 is stored.
- the above-mentioned processing machine main body 120 is, for example, a processing machine main body in a wire electric discharge apparatus or a processing machine main body in a sculpting electric discharge processing apparatus, and includes a processing tank 101 in which an aqueous processing liquid is stored. .
- the used aqueous processing liquid stored in the processing tank 101 is sent to the sewage tank 140, where solid foreign substances are removed and supplied to the fluid-liquid quality control device 80.
- the used aqueous machining fluid supplied to the liquid quality control device 80 is controlled in its liquid quality by the liquid quality control device 80 as described above, and then supplied again to the processing machine main body 120 for electric discharge machining. Sometimes used.
- liquid quality control device 80 when trying to prepare an unused, non-recycled water-based processing fluid using the liquid quality control device 80, as shown in Fig. 6, supply sources of fresh water such as tap water, industrial water, groundwater, etc. 165 Is connected to the liquid quality control device 80.
- FIG. 7 is a configuration diagram schematically showing an example of the electric discharge machining apparatus of the present invention.
- An electric discharge machining apparatus 160A shown in the figure is a wire electric discharge machining apparatus provided with the liquid quality control apparatus 80A described in the second embodiment.
- the processing machine main body 120 in the discharge cache device 160A includes a processing tank 101 in which used aqueous processing liquid is temporarily stored, a table 103 disposed in the processing tank 101, and a processing tank 1101. , A pair of nozzles 105a and 105b fixedly disposed above and below the table 103, a wire bobbin 107 disposed above the table 103, a take-up roll 109 disposed outside the processing tank 101, and a force mechanic It has a collection container 111 arranged outside the tank 101.
- a machining fluid supply device 113 that supplies aqueous machining fluid to each of the nozzles 105a and 105b, and a machining fluid supply pipe 113a that connects the metalworking fluid supply device 113 to each of the nozzles 105a and 105b, not shown.
- a power supply device (not shown).
- the table 103 is driven by a table driving device and moves on an XY plane (horizontal plane), and a force object 170 is disposed on the table 103.
- Each of the pair of nozzles 105a and 105b has a wire electrode 107a drawn from the wire bobbin 107.
- the aqueous machining fluid supplied from the machining fluid supply device 130 via the machining fluid supply pipe 113a is sprayed to the workpiece 170 side during the electric discharge machining, so that the wire electrode 107a and the target electrode An aqueous machining fluid is interposed between the workpiece 170 and the workpiece 170.
- a high frequency pulse voltage is applied from the power supply device to the wire electrode 107a and the driven object 170, and a discharge is generated between the wire electrode 107a and the driven object 170.
- the processing machine main body 120 removes the workpiece 170 minutely by this electric discharge and processes the workpiece 170 into a predetermined shape.
- control device 130 uses a storage unit (not shown) for storing numerical control data used for the discharge force of the force-receiving object 170, and performs processing based on the numerical control data. And a controller (not shown) for controlling the operations of the liquid supply device 113, the table driving device, and the power supply device, and controls the operation of the processing machine main body 120 based on the numerical control data. .
- the used aqueous processing liquid 138 used when the workpiece 170 is discharged by the processing machine main body 120 includes the power waste generated by the discharge force and the discharge cartridge.
- the wire electrode 107a at the time of the operation contains metal ions generated from the object 170, so that the used aqueous processing liquid 138 is transferred from the tank 101 to the waste tank 135 through the drain pipe 135. Sent to 140, where it is temporarily stored.
- the waste water tank 140 is provided with water supply means 145 for supplying the used aqueous processing liquid 138 to the liquid quality control device 8 OA.
- the water supply means 145 includes a pump 141, a water intake pipe 142 having one end disposed in the waste liquid tank 140 and the other end connected to the pump 141, and one end connected to the pump 141 and the other end of the liquid quality control device 80A. And a water supply pipe 143 disposed in the machining liquid tank 3. In the middle of the water supply pipe 143, a filter 150 for removing solid foreign substances from the used aqueous processing liquid 138 is provided!
- the water feeding means 145 is activated, and this used aqueous machining fluid 138 is used as the machining fluid tank of the liquid quality control device 80A.
- Send water in 3 Since the used aqueous processing liquid 138 sent to the processing liquid tank 3 corresponds to the liquid control liquid, the liquid in the carpenter liquid tank 3 is denoted by reference numeral 1 in FIG. In the following, the liquid in the processing liquid tank 3 is referred to as “liquid quality control liquid 1”.
- the liquid quality control device 80A controls the liquid quality of the liquid quality control liquid 1 in the machining liquid tank 3, so that the discharge stability during discharge calorie is high and the work piece is hardly corroded. Prepare aqueous working fluid . Since the details of the operation of the liquid quality control device 80A have already been described in the second embodiment, the description thereof is omitted here.
- the aqueous machining fluid prepared from the used aqueous machining fluid 138 by the liquid quality control device 80A is sent to the machining fluid supply device 113 of the processing machine main body 120 by the water feeding means 155, and is reused at the time of electric discharge machining.
- the water supply means 155 includes a pump 151, a water intake pipe 152 having one end arranged in the machining liquid tank 3 and the other end connected to the pump 151, and one end connected to the pump 151 and the other end connected to the machining liquid supply device 113.
- the water supply pipe 153 is provided, and the pump 151 is periodically operated or operated according to an instruction from the control device 130 to supply the aqueous processing liquid prepared in the processing liquid tank 3 to the processing liquid. Send to device 113.
- FIG. 8 is a flowchart showing the operation of the liquid quality control device 80A in the discharge cache device 160A.
- the figure shows a liquid quality control device 80A when the first condition value and the second condition value (see Embodiment 2) are set to the same value (hereinafter simply referred to as “condition value”).
- condition value the second condition value
- the activated liquid quality control device 80A first determines whether the pH value obtained by the liquid quality measurement unit 5 (see FIG. 7) is greater than the condition value or not. (See Fig. 2) Step S201 is performed, and if it is determined that the pH value is greater than the condition value, the process proceeds to Step S203, and the second supply unit 25 ( Activate Fig. 7).
- the purification of the liquid control solution 1 by the pure water purification unit 20A proceeds.
- step S201 when it is determined in step S201 that the pH value is not greater than the condition value, the process proceeds to step S205, in which it is determined whether or not the pH value is smaller than the condition value. If it is determined in step S205 that the pH value is smaller than the condition value, the process proceeds to step S207, and the first supply unit 15A is operated with the second supply unit 25 stopped. As the first supply unit 15 operates, the electrolyte solution 1 of the liquid control liquid 1 (see FIG. 7) by the electrolyte solution forming unit 10A advances. In step S205, the pH value is smaller than the condition value. If it is determined that there is not, the process returns to step S201 described above.
- FIG. 9 shows the pH value by the pH measurement unit when the liquid quality control device 80A is operated according to the flowchart shown in FIG. 8, the electrolyte solution unit 10A, and the pure water purification unit 20A (see FIG. 7). It is a chart showing a list of correspondence with each operation state.
- the liquid quality control device 80A sets the pure water purification unit 20A in a state where the electrolyte solution conversion unit 10A is stopped.
- the electrolyte solution conversion unit 10A is operated with the pure water purification unit 20A stopped. In this way, the liquid quality control device 80A controls the liquid quality of the liquid quality control liquid 1 to prepare an aqueous processing liquid.
- the liquid quality control device 80A uses the conductivity meter or the like to determine the conductivity of the liquid quality control liquid 1 when preparing the aqueous processing liquid from the liquid quality control liquid 1. Since there is no need to measure !, in the discharge cache device 160A provided with the liquid quality control device 80A, it is not necessary to provide means for measuring the conductivity in the liquid quality control device. It is easy to reduce the cost required for preparing the water-based machining fluid, the manufacturing costs of the liquid quality control device 80A and the electric discharge machining device 160A, or the running costs of the liquid quality control device 80A and the electric discharge cache device 160A.
- FIG. 10 is a configuration diagram schematically showing another example of the electric discharge machining apparatus of the present invention.
- the electric discharge machining apparatus 160B shown in the figure is a wire electric discharge machining apparatus including the liquid quality control apparatus 80B described in the third embodiment, and the configuration other than the liquid quality control apparatus 80B is in the state of electric discharge machining or non-discharge.
- the configuration is the same as that of the discharge cache device 160A shown in FIG. 7 except that the information indicating whether or not the car is in operation is transmitted from the control device 130 to the control unit 75B. Since all the components shown in FIG. 10 have already been described with reference to FIG. 4 or FIG. 7, these components are given the same reference symbols as those used in FIG. 4 or FIG. Therefore, the explanation is omitted.
- FIG. 11 is a flowchart showing the operation of the liquid quality control device 80B in the discharge cache device 160B.
- This figure shows the liquid quality control device 80B when the first condition value and the second condition value (see Embodiment 3) are set to the same value (hereinafter simply referred to as “condition value”). of The operation is shown.
- the activated liquid quality control device 80B first performs step S211 for determining whether or not the force is being processed by electric discharge machining based on information from the control device 130 (see FIG. 10).
- the process proceeds to step S213, and it is determined whether or not the pH value obtained by the liquid quality measurement unit 5 (see FIG. 10) is larger than the condition value.
- step S213 When it is determined in step S213 that the pH value is larger than the condition value, the process proceeds to step S215, where the H + type cation exchange resin column 17 and the OH-type anion exchange resin column 8 (Fig. 10). Supply liquid control fluid 1 to As a result, the purification of the liquid control liquid 1 by the pure water purification unit 20B (see FIG. 10) proceeds.
- step S217 determines whether the pH value is smaller than the condition value.
- step S219 Na + type cation exchange resin tower 7 (see FIG. 10) and OH-type anion exchange resin tower are used.
- the electrolyte solution of the liquid control liquid 1 is advanced by the electrolyte solution forming unit 10B (see FIG. 10).
- step S217 determines whether the pH value is not smaller than the condition value.
- step S211 when it is determined in step S211 that machining is not in progress, the process proceeds to step S221 to determine whether or not the pH value obtained by the liquid quality measurement unit 5 is greater than the condition value.
- step S221 determines whether or not the pH value obtained by the liquid quality measurement unit 5 is greater than the condition value.
- the process proceeds to step S215, and the H + type cation exchange resin column 17 and the OH type anion exchange resin column 8 are controlled for liquid quality. Supply liquid 1. Thereby, the purification of the liquid control liquid 1 proceeds.
- step S221 If it is determined in step S221 that the pH value is not larger than the condition value, the process proceeds to step S223, where it is determined whether or not the pH value is smaller than the condition value.
- step S223 the process proceeds to step S225, and the liquid control liquid 1 is supplied to the OH-type anion exchange resin tower 8. As a result, the pH of the liquid control liquid 1 is adjusted to the alkaline side.
- step S223 that the value of pH is not smaller than the condition value, the process returns to step S211 described above.
- FIG. 12 shows the pH value by the pH measurement unit when the liquid quality control device 80B is operated according to the flowchart shown in Fig. 11, and the electrolyte solution conversion unit 10B and the pure water purification unit 20B (see Fig. 7).
- FIG. 6 is a chart showing a list of correspondence relationships between operation states of OH generation units.
- the “OH generator” here refers to the supply of liquid control liquid 1 to each of the Na + cation exchange resin column 7 and the H + cation exchange resin column 17 shown in FIG.
- the OH-type anion exchange resin tower 8 when the liquid control liquid 1 is supplied only to the OH-type anion exchange resin tower 8 is meant.
- the liquid quality control device 80B when the pH value obtained by the liquid quality measurement unit 5 is larger than the condition value, regardless of whether or not the discharge is in charge, The pure water purification unit 20B is operated with the electrolyte solution tank unit 10B and the OH-generation unit stopped. Also, during the discharge cache and when the pH value obtained by the liquid quality measurement unit 5 is smaller than the condition value, the pure water purification unit 20B and the OH-generation unit are stopped. Activate the electrolyte solution section 10B. When the pH value obtained by the liquid quality measurement unit 5 is smaller than the condition value during non-discharge caching, the electrolyte solution unit 10B and the pure water purification unit 20B were stopped. Activate the OH generator in the state. In this way, the liquid quality control device 80B controls the liquid quality of the liquid quality control liquid 1 to prepare an aqueous processing liquid.
- the liquid quality control device 80B uses the conductivity meter or the like to determine the conductivity of the liquid quality control liquid 1 when preparing the aqueous processing liquid from the liquid quality control liquid 1. Since there is no need to measure !, in the discharge cache device 160B provided with the liquid quality control device 80B, it is not necessary to provide means for measuring the conductivity in the liquid quality control device. It is easy to reduce the cost required for preparing the aqueous machining fluid, the manufacturing costs of the liquid quality control device 80B and the electric discharge machining device 160B, or the running costs of the liquid quality control device 80B and the electric discharge cache device 160B, respectively.
- FIG. 13 is a block diagram schematically showing still another example of the discharge cache device of the present invention.
- the electric discharge machining apparatus 160C shown in the figure is a wire electric discharge machining apparatus including the liquid quality control apparatus 80C described in the fourth embodiment, and the configuration other than the liquid quality control apparatus 80C is shown in FIG.
- the configuration is the same as in the device 160B. Since all the components shown in FIG. 13 have already been described with reference to FIG. 5 or FIG. 7, these components have the same reference numerals as those used in FIG. 5 or FIG. The description is omitted.
- Figure 13 Although not shown in the figure, the acid water generated in the electrolyzed water production unit 50 is supplied to the septic tank 140 through the drain pipe 53.
- FIG. 14 is a flowchart showing the operation of the liquid quality control device 80C in the discharge cache device 160C.
- the first condition value, the second condition value, and the third condition value are set to the same value (hereinafter simply referred to as “condition value”).
- condition value the operation of the liquid quality control device 80C is shown.
- the activated liquid quality control device 80C first performs step S231 to determine whether or not the electric discharge machining is being performed based on the information from the control device 130 (see FIG. 13). When the process is in progress, the process proceeds to step S233, and it is determined whether or not the pH value obtained by the liquid quality measurement unit 5 (see FIG. 13) is larger than the condition value.
- step S233 When it is determined in step S233 that the pH value is larger than the condition value, the process proceeds to step S235, and the first supply unit 15 and the second liquid control liquid supply means 60 are stopped. Activate the second supply 25 (see Fig. 13). As a result, purification of the liquid control liquid 1 by the purification unit 20A (see FIG. 13) proceeds.
- step S233 If it is determined in step S233 that the pH value is not greater than the condition value, the process proceeds to step S237, where it is determined whether or not the pH value is smaller than the condition value. If it is determined in step S237 that the pH value is smaller than the condition value, the process proceeds to step S239, where the second supply unit 25 is stopped and the first supply unit 15 and the second liquid quality control liquid are stopped. Each supply means 60 is activated. As a result, the electrolyte solution of the liquid control liquid 1 is advanced by the electrolyte solution converting unit 10A (see FIG. 13), and the alkaline solution of the liquid control liquid 1 by the electrolytic water production unit 50 is advanced. If it is determined in step S237 that the pH value is not smaller than the condition value, the process returns to step S231 described above.
- step S231 when it is determined in step S231 that the processing is not in progress, the process proceeds to step S231, and it is determined whether or not the pH value obtained by the liquid quality measurement unit 5 is larger than the condition value.
- step S241 it is determined whether or not the pH value obtained by the liquid quality measurement unit 5 is larger than the condition value.
- step S235 the process proceeds to step S235, and the first supply unit 15 and the second liquid control liquid supply means 60 are stopped and the first supply unit 60 is stopped. 2 Operate the supply unit 25. As a result, purification of the liquid control liquid 1 by the purification unit 20A proceeds.
- step S241 If it is determined in step S241 that the pH value is not greater than the condition value, Proceeding to step S243, it is determined whether the pH value is smaller than the condition value. If it is determined in step S243 that the pH value is smaller than the condition value, the process proceeds to step S245, where the second supply unit 15 and the second supply unit 25 are stopped, respectively. The liquid quality control liquid supply means 60 is operated. As a result, the pH of the liquid control liquid 1 is adjusted to the alkaline side. When it is determined in step S243 that the pH value is not smaller than the condition value, the process returns to step S231 described above.
- FIG. 15 shows the pH value by the pH measurement unit when the liquid quality control device 80C is operated according to the flowchart shown in Fig. 14, the electrolyte solution forming unit 10A, the pure water purification unit 20A, and the electrolyzed water production.
- FIG. 15 is a chart showing a list of the correspondences between the operation states of the unit 50 (see FIG. 13).
- the liquid quality control device 80C is used when the pH value obtained by the liquid quality measurement unit 5 is larger than the condition value, regardless of whether or not the discharge is being cached.
- the pure water purification unit 20A is operated with the solution tank unit 10A and the electrolyzed water production unit 60 stopped.
- the pure water purification unit 20A is stopped and the electrolyte solution conversion unit is stopped. 10A is activated and the electrolyzed water production unit 60 is activated.
- the electrolyte solution supply unit 10A and the pure water purification unit 20A are stopped. Activate the electrolyzed water production department 60. In this way, the liquid quality control device 80C controls the liquid quality of the liquid control liquid 1 to prepare an aqueous processing liquid.
- the liquid quality control device 80C uses the conductivity meter to determine the conductivity of the liquid quality control liquid 1 when preparing the aqueous processing liquid from the liquid quality control liquid 1. Since it is a device that does not need to be measured, the discharge cache device 160C equipped with the liquid quality control device 80C does not require a means for measuring the conductivity in the liquid quality control device. It is easy to reduce the cost required for preparing the aqueous machining fluid, the manufacturing cost of each of the liquid quality control device 80C and the electric discharge machining device 160C, or the running cost of each of the liquid quality control device 80C and the electric discharge processing device 160C.
- the liquid quality control method, the liquid quality control apparatus, and the electric discharge machining apparatus according to the present invention have been described with reference to the embodiments, the invention is limited to the above-described embodiments. Various modifications, modifications, combinations, etc. are possible.
- the first liquid control liquid supply means for supplying the liquid control liquid to the electrolyte solution forming section and the pure water purification section may be configured such that each of the electrolyte solution tank section and the pure water purification section is separated from each other by ion exchange. Even when configured with a fat tower, it can be configured with one pump and one flow path switching unit.
- the pH value of the liquid control liquid is obtained as the liquid quality value of the liquid control liquid, and the liquid quality control is performed according to the pH value.
- the liquid quality control method, liquid quality control apparatus, or electric discharge machining apparatus that controls the liquid quality (pH) of the liquid has been described, according to the present invention, the liquid quality value described above is used for the liquid quality control liquid.
- Conductivity specific resistance
- a conductivity meter is used as the liquid quality measuring unit in the liquid quality control device or the electric discharge machining device.
- the first condition value, the second condition value, and the third condition value are each determined as the allowable conductivity range in the aqueous processing fluid to be obtained, It is appropriately selected according to the performance of the equipment used to control the liquid quality of the liquid control liquid and the amount of liquid control liquid.
- the conductivity (specific resistance) of the liquid control liquid is used as the above liquid quality value, it is possible to omit the pH measurement means in preparing the aqueous processing liquid of the desired liquid quality used for electric discharge machining. .
- the cost required for preparing the aqueous machining fluid used for electric discharge machining, and the liquid quality control device Therefore, it is easy to reduce the manufacturing cost of each of the EDM apparatus and the running cost of each of the liquid quality control apparatus and the discharge power device. It is useful for reducing the manufacturing costs of various products manufactured from metal materials.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/307251 WO2007113915A1 (ja) | 2006-04-05 | 2006-04-05 | 液質制御方法、液質制御装置、およびこれを用いた放電加工装置 |
DE112006003830T DE112006003830B4 (de) | 2006-04-05 | 2006-04-05 | Fluid-Qualitätssteuerverfahren, Fluid-Qualitätssteuervorrichtung und diese verwendende Elektroentladungsbearbeitungsvorrichtung |
CN2006800284030A CN101232965B (zh) | 2006-04-05 | 2006-04-05 | 液质控制方法及装置、使用该装置的放电加工装置 |
JP2006529379A JP4926710B2 (ja) | 2006-04-05 | 2006-04-05 | 液質制御方法、液質制御装置、およびこれを用いた放電加工装置 |
KR1020077028529A KR101053291B1 (ko) | 2006-04-05 | 2006-04-05 | 액질 제어 방법, 액질 제어 장치 및 이것을 이용한 방전가공 장치 |
US11/997,881 US8217296B2 (en) | 2006-04-05 | 2006-04-05 | Fluid-quality control method, fluid-quality control apparatus, and electric-discharge machining apparatus employing the same |
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JP (1) | JP4926710B2 (ja) |
KR (1) | KR101053291B1 (ja) |
CN (1) | CN101232965B (ja) |
DE (1) | DE112006003830B4 (ja) |
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Cited By (5)
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JP2010099648A (ja) * | 2008-09-26 | 2010-05-06 | Ryoden Koki Engineering Kk | 純水器 |
JP2010099809A (ja) * | 2008-10-27 | 2010-05-06 | Sodick Co Ltd | 放電加工方法および放電加工装置 |
US9056361B2 (en) | 2009-12-18 | 2015-06-16 | Mitsubishi Electric Corporation | Liquid-quality adjusting apparatus, liquid-quality adjusting method, and wire electric discharge machining apparatus |
JP7409931B2 (ja) | 2020-03-23 | 2024-01-09 | 三井精機工業株式会社 | 水潤滑式コンプレッサ |
WO2024057365A1 (ja) * | 2022-09-12 | 2024-03-21 | ファナック株式会社 | 給水装置、及び、給水装置の制御方法 |
Families Citing this family (5)
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DE102010032722A1 (de) * | 2010-07-26 | 2012-01-26 | Bwt Ag | Verfahren und Anlage zur Aufbereitung von Wasser |
JP5232314B1 (ja) * | 2012-02-13 | 2013-07-10 | ファナック株式会社 | 加工液の温度制御機能を有するワイヤ放電加工機 |
EP3052226B1 (en) | 2013-09-30 | 2019-07-03 | GE Healthcare Bio-Sciences AB | Method for preparation of liquid mixtures |
TWI509870B (zh) * | 2014-07-18 | 2015-11-21 | Inst Nuclear Energy Res Atomic Energy Council | 利用電解液流體管路儲放電能之方法與結構 |
JP6416810B2 (ja) * | 2016-02-24 | 2018-10-31 | ファナック株式会社 | 加工液集中管理システム |
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- 2006-04-05 CN CN2006800284030A patent/CN101232965B/zh active Active
- 2006-04-05 WO PCT/JP2006/307251 patent/WO2007113915A1/ja active Application Filing
- 2006-04-05 US US11/997,881 patent/US8217296B2/en active Active
- 2006-04-05 DE DE112006003830T patent/DE112006003830B4/de active Active
- 2006-04-05 JP JP2006529379A patent/JP4926710B2/ja active Active
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JPS57205027A (en) * | 1981-06-15 | 1982-12-16 | Amada Co Ltd | Working liquid supplier for wire cut discharge machining machine |
JPH01164489A (ja) * | 1987-12-21 | 1989-06-28 | Mitsubishi Electric Corp | イオン交換樹脂による水のpH制御方法 |
JPH04141320A (ja) * | 1990-10-02 | 1992-05-14 | Mitsubishi Electric Corp | 放電加工機用加工液供給装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2010099648A (ja) * | 2008-09-26 | 2010-05-06 | Ryoden Koki Engineering Kk | 純水器 |
JP2010099809A (ja) * | 2008-10-27 | 2010-05-06 | Sodick Co Ltd | 放電加工方法および放電加工装置 |
US9056361B2 (en) | 2009-12-18 | 2015-06-16 | Mitsubishi Electric Corporation | Liquid-quality adjusting apparatus, liquid-quality adjusting method, and wire electric discharge machining apparatus |
JP7409931B2 (ja) | 2020-03-23 | 2024-01-09 | 三井精機工業株式会社 | 水潤滑式コンプレッサ |
WO2024057365A1 (ja) * | 2022-09-12 | 2024-03-21 | ファナック株式会社 | 給水装置、及び、給水装置の制御方法 |
Also Published As
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US20100219164A1 (en) | 2010-09-02 |
CN101232965B (zh) | 2012-11-21 |
DE112006003830B4 (de) | 2010-09-02 |
JP4926710B2 (ja) | 2012-05-09 |
DE112006003830T5 (de) | 2009-02-26 |
KR101053291B1 (ko) | 2011-08-01 |
CN101232965A (zh) | 2008-07-30 |
US8217296B2 (en) | 2012-07-10 |
JPWO2007113915A1 (ja) | 2009-08-13 |
KR20080007670A (ko) | 2008-01-22 |
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