WO2006126248A1 - 加工液液質制御装置とその方法、および放電加工装置 - Google Patents
加工液液質制御装置とその方法、および放電加工装置Info
- Publication number
- WO2006126248A1 WO2006126248A1 PCT/JP2005/009363 JP2005009363W WO2006126248A1 WO 2006126248 A1 WO2006126248 A1 WO 2006126248A1 JP 2005009363 W JP2005009363 W JP 2005009363W WO 2006126248 A1 WO2006126248 A1 WO 2006126248A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductivity
- liquid
- exchange resin
- machining
- processing
- Prior art date
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Classifications
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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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J47/00—Ion-exchange processes in general; Apparatus therefor
- B01J47/14—Controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J47/00—Ion-exchange processes in general; Apparatus therefor
- B01J47/14—Controlling or regulating
- B01J47/15—Controlling or regulating for obtaining a solution having a fixed pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
- C02F2001/4619—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water only cathodic or alkaline water, e.g. for reducing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/90—Ultra pure water, e.g. conductivity water
Definitions
- Machining fluid quality control device and method, and electrical discharge machining device Machining fluid quality control device and method, and electrical discharge machining device
- the present invention relates to a machining liquid quality control apparatus and method for controlling the conductivity and PH of ion-exchanged water used as a machining liquid in an electric discharge machining process, and a machining liquid quality control apparatus. It relates to the device.
- Patent Document 1 Japanese Patent Laid-Open No. 63-191514
- Patent Document 2 Japanese Patent Laid-Open No. 4-141319
- Patent Document 3 JP-A-5-42414
- Patent Document 4 Japanese Patent Laid-Open No. 2002-301624
- Patent Document 5 Japanese Patent Laid-Open No. 7-145491
- a force that uses a pH meter to measure the pH of the processing liquid in the discharge cache treatment is usually a glass electrode. ing .
- the pH meter is immersed in the processing solution for a long time, the internal solution of the pH meter will be contaminated. Therefore, the problem is that the glass electrode must be regularly maintained.
- an anion exchange resin in which one or more of nitrite ions, carbonate ions, hydrogen carbonate ions, and hydroxide ions described in Patent Document 4 are fixed is used as a corrosion inhibitor for processing liquids.
- the force is effective for passivating metals such as iron.
- Carbide materials and Cu (copper) are not passivated, and metal materials cannot be expected to have an anticorrosive effect. There were also problems.
- the machining fluid for the electric discharge machining process needs to be maintained at a predetermined conductivity or less in order not to deteriorate the electric discharge machining performance.
- the processing solution is passed through purified water (H + type cation exchange resin + OH- type anion exchange resin).
- purified water H + type cation exchange resin + OH- type anion exchange resin.
- the water-soluble metal anticorrosive described in Patent Document 5 is added to the machining fluid for electric discharge machining, the ionic substances in the water-soluble metal anticorrosive are trapped by the purified water resin.
- the concentration of the water-soluble metal anticorrosive agent in the processing liquid is lowered, and the anticorrosive effect on the cemented carbide material and the metal material cannot be exhibited.
- the present invention has been made in view of the above, and measured the pH of ion-exchanged water as a working fluid used in the electric discharge machining treatment without using a pH meter to perform electric discharge machining.
- the object is to obtain a processing liquid quality control apparatus and method for controlling the conductivity and pH of ion-exchanged water so that it can be stably performed and has an anticorrosive effect on the workpiece.
- Another object of the present invention is to obtain an electric discharge machining apparatus provided with the machining liquid quality control apparatus. Means for solving the problem
- a machining fluid / liquid quality control device that is useful in the present invention comprises a machining fluid tank for storing machining fluid and a predetermined amount of impurity ions from the machining fluid in the machining fluid tank. So that the impurity ions are removed to generate pure water, and the impurity cations in the processing liquid in the processing liquid tank are replaced with predetermined cations, and the impurity anions are anticorrosive ions.
- the anti-corrosion ion generating means to be replaced the switching means for switching the processing liquid in the processing liquid tank to be shifted between the pure water purification means or the anti-corrosion ion generating means, and the water in the processing liquid tank, Based on the conductivity measured by the conductivity measuring means and the conductivity measured by the conductivity measuring means, the processing liquid is purified by the pure water purification means or the anticorrosion ion generating means. ! /, Switching to control the switching means so that the water is fed to the wrong side And a control means.
- the pH of the machining liquid can be obtained without using a pH meter, and the process liquid such as a cemented carbide material or a metal material can be obtained. It has the effect that corrosion of the workpiece can be prevented.
- FIG. 1 is a diagram schematically showing a configuration of a first embodiment of a machining fluid / liquid quality control apparatus according to the present invention.
- FIG. 2 is a diagram schematically showing a configuration of a second embodiment of the machining fluid / liquid quality control apparatus according to the present invention.
- FIG. 3 is a graph showing the relationship between conductivity and pH in aqueous NaOH solution.
- FIG. 4 is a diagram schematically showing an example of the configuration of an electrical discharge machining apparatus provided with the machining fluid / liquid quality control apparatus of FIG. 2.
- FIG. 5 is a diagram showing a control operation by a switching control unit.
- FIG. 6 is a flowchart showing a procedure of switching processing by the switching control unit.
- FIG. 7 is a graph showing changes in the conductivity and pH of the processing fluid in tap water injection with time.
- FIG. 8 schematically shows the configuration of a third embodiment of the machining fluid / liquid quality control device according to the present invention.
- FIG. 9 is a diagram schematically showing an example of the configuration of an electric discharge machining apparatus provided with the machining fluid / liquid quality control apparatus of FIG. 8.
- FIG. 10 is a diagram showing a control operation by a switching control unit.
- FIG. 11 is a flowchart showing a procedure of switching processing by the switching control unit.
- FIG. 12 is a diagram schematically showing a configuration of a fourth embodiment of the machining fluid / liquid quality control device according to the present invention.
- FIG. 13 is a diagram showing an example of the configuration of an electric discharge machining apparatus including the machining fluid / liquid quality control apparatus of FIG.
- FIG. 14 is a diagram showing a control operation by a switching control unit.
- FIG. 15 is a flowchart showing a procedure of switching processing by the switching control unit. Explanation of symbols
- the treatment is generally performed by immersing a super hard material such as WC-Co or a metal material such as Cu in the caustic solution. Therefore, the reaction when these super hard materials and metal materials are first immersed in neutral water will be explained.
- WC-Co as a super hard material is corroded in neutral water as shown in the following formula (1), and as shown in the following formula (2), Dissolved oxygen in the water is reduced by the electrons generated in the equation.
- Co which is a binder phase, is selectively corroded by dissolved oxygen in water. This selective corrosion of Co creates a void layer due to the corrosion of Co on the surface of the cemented carbide (WC—Co).
- the corrosion reaction of the metal material also proceeds in neutral water as in the case of the superhard material.
- Cu is taken as an example of the metal material, and the corrosion reaction in water is shown in the following equations (4) to (6).
- the corrosion factor of superhard materials such as WC-Co and metal materials such as Cu in neutral water is dissolved oxygen. Therefore, referring to Eqs. (3) and (6), in the machining fluid (water) where dissolved oxygen exists, the pH of the machining fluid is controlled to be alkaline, that is, hydroxide ions are reduced. By increasing the concentration, it becomes possible to prevent the cemented carbide and metal materials. As a result of various experiments, in order to exert the anticorrosion effect of super hard materials such as WC-Co and metal materials such as Cu, Fe (iron), Zn (zinc) in the alkaline region, the lower limit of pH is 8. 5 is desirable. Moreover, since the pH is raised Chikara ⁇ Eeki conductivity of resulting in lowering the discharge mosquitoes ⁇ E performance increases, Rukoto be between 10.5 to limit P H is desired.
- the machining fluid in order to determine the pH of the machining fluid without using a pH meter, is pure water (ion-exchanged water) containing a predetermined amount of impurities, and these impurities are placed by ions constituting the strongly basic aqueous solution.
- the impurity cation is replaced with a cation such as an alkali metal or alkaline earth metal, and the impurity anion is replaced with a hydroxide ion (OH—).
- the conductivity is a measure of the amount of anions. It is a little different to respond.
- the pH can be determined by measuring the conductivity of the power solution (ion exchange water) that has become an alkaline aqueous solution. Then, the measured conductivity is compared with the conductivity within a predetermined pH range, and based on the comparison result, the amount of hydroxide ions contained in the machining fluid is controlled. In addition, it becomes possible to maintain the corrosion resistance of the workpiece without degrading the electric discharge machining performance. As a result, the pH can be determined by measuring the conductivity without using a pH meter using a glass electrode.
- FIG. 1 is a diagram schematically showing a configuration of the first embodiment of the machining fluid / liquid quality control apparatus according to the present invention.
- This processing liquid quality control device 10 includes a processing stock solution supply unit 11, a processing liquid tank 12, a conductivity measurement unit 13, a pure water purification unit 14, an anticorrosion ion generation unit 15, and a switching unit 16 And a switching control unit 17.
- the processing stock solution supply unit 11 supplies a processing stock solution serving as a processing solution source, and specifically supplies fresh water such as tap water, industrial water, and groundwater.
- the machining fluid tank 12 is a tank for storing the machining fluid used in the electric discharge machining of the discharge machining apparatus, and the conductivity measuring unit 13 measures the conductivity of the machining fluid in the machining fluid tank 12. Is.
- the dewatering unit 14 removes impurity ions in the fresh water supplied from the processing stock solution supply unit 11 and the processing liquid supplied from the processing liquid tank 12, and thereby ion-exchanged water (hereinafter referred to as pure water). (Also called water). However, a trace amount of impurity ions is left in the pure water so that the conductivity is several to several tens / z S Zcm without completely removing the impurities. As a result, the impurity ions are replaced with hydroxide ions, which are anticorrosion ions generated by the anticorrosion ion generator 15 described later, and the concentration force pH value of the impurity ions can be obtained. As such a dewatering unit 14, a mixture of H + type cation exchange resin and OH- type anion exchange resin or a combination thereof can be used.
- the anticorrosion ion generator 15 generates hydroxide ions as anticorrosion ions, and replaces the impurity ions in the ion exchange water (or caustic solution) with anticorrosion ions.
- the ion-exchanged water containing impurity ions is replaced with anticorrosion ions, which will be referred to as a processing liquid.
- Such an anticorrosion ion generator 15 may be a mixture or combination of an alkali metal ion type or alkaline earth metal ion type cation exchange resin and an OH-type anion exchange resin, or electrolyzed water. A combination of manufacturing equipment can be used.
- the switching unit 16 switches the supply of the processing stock solution from the processing stock solution supply unit 11 or the processing solution from the coating solution tank 12 to the pure water purification unit 14 or the anticorrosion ion generation unit 15. And so on.
- the switching control unit 17 uses the conductivity of the machining fluid with various changes in the pH value (the concentration of hydroxide ions) to determine the conductivity between the conductivity in the machining fluid and the pH.
- the pH of the solution is obtained in advance, and the pH of the solution is obtained from the conductivity measured by the conductivity measuring unit 13 with reference to the conductivity pH information so that the pH falls within a predetermined range.
- the switching unit 16 is controlled in order to switch the processing liquid delivery destination from the cache liquid tank 12.
- conductivity-pH information a range of conductivity within a predetermined range of pH is obtained in advance, and the conductivity measured by the conductivity measuring unit 13 is switched to be within the range of conductivity. Unit 16 may be controlled.
- the control of the switching unit 16 based on the specific conductivity by the switching control unit 17 is to purify the working fluid (or pure water) so that the pH is lowered when the pH is higher than a predetermined value.
- the switching unit 16 is switched so as to pass through the unit 14, and when the pH is lower than the predetermined value, the processing liquid (or pure water) is passed through the anticorrosion ion generating unit 15 so that the pH is higher. Switching part 1 6 is switched.
- the processing stock solution supply unit 11 and the carpenter solution tank 12 are connected to the switching unit 16 by a pipe or a hose, respectively, and on the connection side between the processing stock solution supply unit 11 and the processing solution tank 12 of the switching unit 16.
- a first pump 22 is provided between the processing stock solution supply unit 11 and the valve 21 for sending the processing stock solution to the switching unit 16 side.
- a second pump 23 is provided for sending the machining fluid to the switching unit 16 side.
- a pipe, a hose, or the like is connected between the pure water purification unit 14 and the chemistry liquid tank 12 and between the anticorrosion ion generation unit 15 and the processing liquid tank 12.
- a method for controlling the liquid quality of the machining liquid in the machining liquid quality control apparatus 10 explain.
- the switching unit 16 is switched so that the liquid in the apparatus flows to the dewatering unit 14 side, and the valve 21 and the switching unit 16 are switched from the processing stock solution supply unit 11 to the fresh water power that is a fresh water power first solution 22.
- the water is passed through the dewatering unit 14 through Impurities in the fresh water are removed by the pure water purification unit 14 so that a small amount of impurity ions remain, and the ion-exchanged water (pure water) is supplied to the processing liquid tank 12.
- the switching unit 16 is switched so that the liquid flows to the anticorrosion ion generation unit 15 side, and the ion exchange water in the processing liquid tank 12 is protected by the second pump 23 via the valve 21 and the switching unit 16. Water is passed through the ion generator 15.
- the impurity anions in the ion exchange water are replaced with hydroxide ions which are anticorrosion ions, and are supplied to the processing liquid tank 12 as a processing liquid.
- Impurity cations in ion-exchanged water are replaced with alkali metal or alkaline earth metal cations.
- the machining fluid becomes an aqueous solution of a strong base, and a correlation can be established between the conductivity of the machining fluid and the pH.
- the conductivity measuring unit 13 of the machining fluid tank 12 measures the conductivity of the machining fluid and outputs the measurement result to the switching control unit 17.
- the switching control unit 17 compares the conductivity measured by the conductivity measuring unit 13 with a reference conductivity corresponding to a predetermined pH value. When the conductivity is higher than the reference conductivity, the pH of the machining fluid becomes higher than the predetermined pH, and therefore the switching unit is configured to pass the machining fluid through the pure water purification unit 14 in order to lower the pH. Control 1-6. On the other hand, when the conductivity is lower than the reference conductivity, the pH of the processing liquid is lower than the predetermined pH, so the processing liquid is switched to pass through the anti-corrosion ion generator 15 to increase the pH. Control part 16. As described above, the conductivity and pH of the machining fluid are controlled by measuring the conductivity of the kale solution as a strong base aqueous solution in the machining fluid tank 12.
- ion-exchanged water containing a predetermined amount of impurity ions is replaced with an alkali metal or alkaline earth metal cation and hydroxide ion, and is strongly basic. Since the processing fluid conductivity is correlated with the pH of the processing fluid, the information necessary to control the pH of the processing fluid simply by measuring the conductivity of the processing fluid. Can be obtained. This eliminates the need for a pH meter with a glass electrode that measures the pH of the machining fluid, and eliminates the need for pH meter maintenance.
- Embodiment 2 In the first embodiment, the outline of the processing fluid liquid quality control device and the method thereof has been described.
- the H + type cation exchange resin and the OH type anion exchange resin are mixed in the pure water purification unit. Processed liquid using a pure water resin tower made of resin and an ion exchange resin tower made of a mixture of Na + type cation exchange resin and OH type anion exchange resin in the anti-corrosion ion generator A quality control device and an electric discharge machining device equipped with this machining liquid-liquid quality control device will be described.
- FIG. 2 is a diagram schematically showing a configuration of the second embodiment of the machining fluid / liquid quality control apparatus according to the present invention.
- the purifying unit 14 is a mixture of H + type cation exchange resin and OH- type anion exchange resin.
- the anti-corrosion ion generator 15 is composed of an ion-exchange resin tower 15 A consisting of a mixed resin of Na + type cation exchange resin and OH- type anion exchange resin. Is done.
- the processing stock solution supply unit 11 in FIG. 1 includes a water tank 11A for storing fresh water. Since other components are the same as those in the first embodiment, the same reference numerals are given and descriptions thereof are omitted.
- H + type cation exchange resin used in the purified water resin tower 14A for example, a styrene dibutene benzene copolymer, phenol formalin resin or the like is used as a base, and a sulfonic acid group is used as an ion exchange group. Things.
- H + type Amber Lai MR120B (trade name of Rohm and Haas)
- H + type Diaion SK1B (trade name of Mitsubishi Igaku Corporation) may be used. it can.
- OH-type anion exchange resin used in the purified water resin tower 14A for example, a styrene dibulene benzene copolymer or the like is used as a base, and a trimethylammonium group, ⁇ -hydride is used as an ion exchange group.
- examples include those having a droxychetyl dimethyl ammonium group.
- the amberlite IRA400J trade name of Rohm 'and' Haas
- the diamond-type SA10A trade name of Mitsubishi Chemical Corporation
- Purified water-containing resin containing a mixture of ⁇ + -type cation exchange resin and ⁇ -type anion exchange resin Tower 14A Fresh water such as tap water, industrial water, groundwater, etc. ), The impurity ions in the fresh water are removed. For example, impure in fresh water If K + is present as the cation and C1— is present as the impurity anion, in the H + cation exchange resin, K + is trapped in the purified water resin by the reaction of the following formula (7), and the OH form anion In the ion exchange resin, C1- is trapped in the purified water resin by the reaction of the following formula (8).
- R is polystyrene matrix resin.
- the ion exchange resin tower 15A made of a mixed resin of Na + type cation exchange resin and OH- type anion exchange resin is used as the anticorrosive ion generation part, alkaline processing In order to produce a liquid, it is adjusted so as to leave a very small amount of impurity ions (conductivity of several to several tens of ⁇ S / cm).
- Na + type cation exchange resin of the ion exchange resin tower 15A for example, a styrene monovinylbenzene copolymer, phenol formalin resin, etc. as a base and having a sulfonic acid group as an ion exchange group.
- a styrene monovinylbenzene copolymer, phenol formalin resin, etc. as a base and having a sulfonic acid group as an ion exchange group.
- Na + type Amberlite I R120B trade name of Rohm and Haas
- Na + type Diaion SK1B trade name of Mitsubishi Chemical Corporation
- the OH-type anion exchange resin of the ion exchange resin tower 15A can be the same as the OH-type anion exchange resin of the purified water resin tower 14A. This OH-type anion exchange resin is necessary for alkalinizing the processing liquid to be passed through the ion exchange resin tower 15A, and replaces impurities in water with OH-.
- Impurity cations in the processing liquid are allowed to flow through the ion-exchange resin tower 15A made of a mixed resin of Na + -type cation exchange resin and OH-type anion exchange resin, by passing water through the hydraulic fluid.
- impurity anions are replaced by hydroxide ions.
- K + is present as an impurity cation
- SO 2 is present as an impurity anion in the working fluid
- the ion exchange water (pure water) is generated with a small amount. Then, the ion-exchanged water was passed through the ion-exchange resin tower 15A containing a mixture of Na + -type cation exchange resin and OH--type anion exchange resin to remove impurity cations in the ion-exchange water. Replace with Na +, and replace the impurity anion with OH to make the working fluid. As a result, the ion-exchanged water becomes an alkaline aqueous NaOH solution having a correlation between pH and conductivity.
- the ion-exchanged water generated from the above processing stock solution is used as the processing fluid for the discharge cache device.
- This machining fluid must be controlled to have a predetermined conductivity and pH.
- the amount of anions contained in the ion-exchanged water before passing through the ion-exchange resin tower 15A is replaced with OH-.
- the amount of OH—generated by the ion-exchange resin tower 15A that is, the pH
- the conductivity that is a measure of the amount of anion.
- the conductivity is higher than the standard conductivity corresponding to the predetermined pH value, To lower the conductivity or pH.
- the conductivity is lower than the standard conductivity corresponding to the predetermined pH value
- the water is passed through the ion exchange resin tower 15A to increase the conductivity, that is, the pH.
- FIG. 4 is a diagram schematically showing an example of the configuration of an electric discharge machining apparatus provided with the machining fluid / liquid quality control apparatus of FIG.
- the electric discharge machining apparatus includes an electric discharge machining unit 300 that performs electric discharge machining on the workpiece 301, and a machining liquid quality control unit 100A that circulates and cleans and reuses the machining fluid used in the electric discharge machining unit 300. And.
- the discharge force feeding unit 300 stores the machining fluid and discharges the working fluid from the upper and lower sides of the machining tank 302 and the discharge vessel processing of the discharge target 301.
- a collection roller 307 that conveys and collects the wire electrode 305 stretched via the nozzle 303 and the lower machining liquid nozzle 304 and a collection box 308 that collects the processed wire electrode 305 are provided.
- An electric discharge machining process is performed by generating an electric discharge between the workpiece 301 and the wire electrode 305 through the machining liquid in the machining tank 302 of the electric discharge force feeding unit 300.
- the processing liquid / liquid quality control unit 100A includes a septic tank 121 to which a machining liquid is supplied from the processing tank 302, a filtration pump 231 for pumping the processing liquid from the sewage tank 121, and a pumping pump 231.
- the filter 232 for filtering the formed liquid, the clear liquid tank 122 for storing the processing liquid that has passed through the filtration filter 232, and the processing liquid in the clear liquid tank 122 are used as the upper processing liquid for the discharge power unit 300.
- a working fluid pump 233 for jetting between the workpiece 301 and the wire electrode 305 via the nozzle 303 and the lower working fluid nozzle 304, and a purified water resin for removing impurity ions in the working fluid The pure water refining tower 140 and the pure water refining pump 161 that sucks up the processing liquid from the clean liquid tank 122 and supplies it to the pure water refining tower 140 and the processing liquid in the clear liquid tank 122.
- the hydraulic working solution that has passed through the purified water resin tower 140 and the anticorrosive resin tower 150 is returned to the clean liquid tank 122 again.
- the machining liquid in the clean liquid tank 122 is also blown into the space between the wire electrode 305 and the target object 301 by the machining liquid pump 233 and the force of the upper machining liquid nozzle 303 and the lower machining liquid nozzle 304. It is temporarily stored in tank 12.
- a voltage is applied between the workpiece 301 and the wire electrode 305 to cause discharge through the machining fluid ejected from the upper machining fluid nozzle 303 and the lower machining fluid nozzle 304, and Processing is advanced by melting and removing.
- the wire electrode 305 was also wound around the wire bobbin 306 during the machining so that the wire electrode 305 was supplied to the heating part as the machining progressed because the discharge part melted and deteriorated along with the electric discharge machining.
- the wire electrode 305 continues to be sent to the collection box 308 via the upper machining liquid nozzle 303, the lower machining liquid nozzle 304, and the collection roller 307.
- the machining liquid ejected from the upper machining liquid nozzle 303 and the lower machining liquid nozzle 304 flows in the sludge generated in the machining portion, and then is in a state containing a large amount of impurities, and is temporarily stored in the machining tank 302.
- the processing liquid in the processing tank 302 is guided to the dirty liquid tank 121 through the piping path, and the processing liquid in the dirty liquid tank 121 is sent to the filtration filter 232 by the filtration pump 231.
- the processing liquid containing impurities is filtered by passing through the filter 232, and the filtered processing liquid is stored in the clean liquid tank 122.
- the conductivity of the processing liquid in the clean liquid tank 122 is measured by the conductivity meter 130, and the measurement result is sent to the switching control unit 170.
- FIG. 5 is a diagram showing a control operation by the switching control unit
- FIG. 6 is a flowchart showing a procedure of switching processing by the switching control unit.
- the switching control unit 170 performs control processing therefor.
- the purified hydrophobic pump 161 is operated and the anticorrosive sanitary pump 162 is stopped.
- the pure water refining pump 161 is stopped and the anticorrosion refining pump 162 is operated. That is, the switching control unit 170 determines whether or not the measured conductivity (pH value) of the machining fluid is higher than a predetermined set value (step S111), and the conductivity (pH value) of the machining fluid is determined. ) Is higher than a predetermined set value (Yes in step S111), the purified water pump 161 is operated and the anticorrosive pump 162 is stopped (step S112).
- the processing liquid in the clean liquid tank 122 is sent to the purified water resin tower 14A via a piping path to remove impurity ions such as metal ions generated by electric discharge machining and carbonate ions due to dissolution of carbon dioxide in the atmosphere. Reduce the conductivity (pH value) of the processing fluid.
- step S111 when the conductivity (pH value) of the machining fluid is lower than the predetermined set value (No in step S111), the pure water refining pump 161 is stopped and the anticorrosion refining pump 162 Is activated (step S113).
- the processing liquid in the clean liquid tank 122 is sent to the anti-corrosion resin tower 150 via the piping path, and the electric conductivity (pH Value) is kept near the preset value.
- the electric discharge machining is performed in the electric discharge machining apparatus.
- the setting value for this was 14 SZcm.
- the conductivity of tap water which is the processing stock solution
- the conductivity of tap water is 147 ⁇ SZcm
- the processing liquid in the tank 122 is passed through the purified water resin tower 140, and the process of removing impurity ions is repeated.
- ion-exchanged water with conductivity of 14 SZcm and pH of 6.2 was generated.
- the conductivity of the processing liquid in the clear liquid tank 122 becomes 14 SZcm or less
- the liquid is passed through the anti-corrosion resin tower 150, and the pH value shown in the flowchart of FIG. 9.
- the process of substituting impurity anions with hydroxide ions is repeated until the conductivity corresponding to 5 is reached.
- FIG. 7 is a graph showing changes in conductivity and pH of tap water pouring power with time.
- a predetermined amount of impurity ions in the processing liquid is obtained by the pure water-containing resin tower 140 made of a mixture of H + type cation exchange resin and OH- type anion exchange resin.
- This predetermined amount of impurity ions is further replaced with a predetermined cation and hydroxide anion by the anti-corrosion resin pump 162 which also has the power of mixing Na + type cation exchange resin and OH- type anion exchange resin.
- the processing liquid is a strongly basic aqueous solution, there is an effect that a correlation can be established between the processing liquid and pH. As a result, even without a pH meter, it is possible to control the pH of the chemistry liquid simply by measuring the conductivity of the machining liquid. It is possible to prevent corrosion of the product 301.
- Embodiment 3 the pure water purification section and the anticorrosion ion production section of Embodiment 1 are combined with the H + type cation exchange resin tower, the Na + type cation exchange resin tower, and the OH-type anion exchange resin.
- a machining liquid / liquid quality control apparatus constituted by a tower and an electric discharge machining apparatus equipped with the machining liquid / liquid quality control apparatus will be described.
- FIG. 8 is a diagram schematically showing a configuration of the third embodiment of the machining fluid / liquid quality control device that is useful in the present invention.
- the processing liquid / liquid quality control apparatus 10B includes, in FIG. 1 of Embodiment 1, the pure water purification unit 14 and the anticorrosion ion generation unit 15 configured only by H + type cation exchange resin.
- H + cation exchange resin 14B Na + cation exchange resin 15B composed only of Na + cation exchange resin, and OH—comprised only of OH anion exchange resin
- An anion exchange resin tower 18B which controls the opening and closing of valves 16A to 16C corresponding to the switching section 16 provided on the water tank 11A and machining liquid tank 12 side of each tower 14B, 15B, 18B As a result, it functions as the pure water purification unit 14 or as the anticorrosion ion generation unit 15. That is, the processing equivalent to that of the pure water purification unit 14 of Embodiment 1 is performed by passing the processing liquid through the H + type cation exchange resin tower 14B and the OH-type anion exchange resin tower 18B.
- the processing equivalent to that of the anticorrosion ion generation unit 15 of Embodiment 1 is performed by passing the processing liquid through the Na + type cation exchange resin tower 15B and the OH ⁇ type anion exchange resin tower 18B.
- each ion exchange resin used in the third embodiment the same one as shown in the second embodiment can be used.
- fresh water which is the processing stock solution sent from the tank 11A by the pump 22, is opened by opening the valves 16A and 16C and closing the valve 16B, so that the H + type cation exchange resin tower 14B and the OH-type anion exchange vessel Pass water through the oil tower 18B.
- the impurity ions in the fresh water Na +, Ca CI -, SO 2, etc.
- Ion exchange water is generated.
- the ion exchange water is passed through the Na + type cation exchange resin tower 15B and the OH-type anion exchange resin tower 18B.
- the impurity cations in the ion exchange water are replaced with Na +
- the substance anion is replaced with OH.
- the ion-exchanged water becomes an alkaline aqueous NaOH solution having a correlation between pH and conductivity.
- the amount of anions contained in the ion-exchanged water before passing through the Na + type cation exchange resin tower 15B and the OH-type anion exchange resin tower 18B corresponding to the anticorrosion ion generation unit 15 is to control the amount of OH, the amount of OH produced by OH-form anion exchange resin is controlled by controlling the conductivity, which is a measure of the amount of anion. Can do.
- FIG. 9 is a diagram schematically showing an example of the configuration of an electric discharge machining apparatus provided with the machining liquid quality control apparatus of FIG.
- This electric discharge apparatus includes an electric discharge machining unit 300 for performing electric discharge machining on the workpiece 301, and a machining liquid quality control unit for circulating the machining fluid used in the electric discharge machining unit 300 for cleaning and reuse. It is composed of 100B.
- the electric discharge force feeding unit 300 is the same as that in the second embodiment.
- the same components as those in Embodiment 2 are denoted by the same reference numerals, description thereof will be omitted, and different parts will be described.
- the switching control unit 170 uses the H + type cation exchange resin pump 163, the OH-type anion exchange resin pump 181 and the Na + type cation exchange resin pump 164 based on the measured value of the conductivity meter 130. Control of Z stop state.
- the processing liquid that has passed through the H + type cation exchange resin tower 141, the OH-type anion exchange resin tower 180, and the Na + type cation exchange resin tower 151 is returned to the clean liquid tank 122 again.
- the processing liquid containing impurities temporarily stored in the caloric processing tank 302 by the electric discharge machining process is guided to the sewage tank 121 and further filtered after the impurities are filtered.
- the subsequent machining fluid is stored in the clean liquid tank 122.
- the conductivity of the processing liquid in the clean liquid tank 122 is measured by the conductivity meter 130, and the measured result is sent to the switching control unit 170.
- FIG. 10 is a diagram showing a control operation by the switching control unit
- FIG. 11 is a flowchart showing a procedure of switching processing by the switching control unit.
- the switching control unit 170 performs a process for that purpose. As shown in Fig.
- the H + type cation exchange resin pump 163 and the OH-type anion exchange resin pump 181 are operated, and the Na + type The cation exchange resin pump 164 is stopped, and the processing liquid in the clean liquid tank 122 is sent to the H + type cation exchange resin tower 141 and the OH-type anion exchange resin tower 180 via the piping path.
- the OH-type anion exchange resin pump is used to maintain the pH value so as not to impair the anticorrosive properties of the coating fluid.
- the OH-type anion exchange resin pump 181 is operated to maintain the anti-corrosion effect during non-working.
- the H + type cation exchange resin pump 163 and the Na + type cation exchange resin pump 164 are stopped, and the processing liquid in the clean liquid tank 122 is sent to the OH type anion exchange resin tower 180 via the piping path.
- the switching control unit 170 determines whether or not the measured conductivity (pH value) of the machining fluid is higher than a predetermined set value (step S211), and the conductivity (pH value) of the machining fluid is determined. Is higher than the set value (Yes in step S211), the H + type cation exchange resin pump 163 and the OH— type anion exchange resin pump 1181 are operated, and the Na + type cation exchange resin The pump 164 is stopped (step S212). As a result, the processing liquid in the clear liquid tank 122 passes through the piping route.
- impurity ions such as carbonate ions due to dissolution of metal ions generated in the discharge process and carbon dioxide in the atmosphere are sent to the H + type cation exchange resin tower 141 and the OH-type anion exchange resin tower 180. Remove and reduce the conductivity (pH value) of the working fluid.
- step S213 If processing is in progress (Yes in step S213), the H + type cation exchange resin pump 163 is stopped, and the OH type anion exchange resin pump 181 and the Na + type cation exchange resin pump 164 are connected. Activate (Step S214). As a result, in order to maintain the pH value so as not to impair the anti-corrosion properties of the processing liquid, the processing liquid in the clear liquid tank 122 passes through the piping path through the OH-type anion exchange resin tower 180 and the Na + type cation. It is sent to the replacement resin tower 151, and the conductivity (pH value) of the working fluid is kept near the preset value.
- step S213 the H + type cation exchange resin pump 163 and the Na + type cation exchange resin pump 164 are stopped, and the OH- The ion exchange resin pump 181 is activated (step S215).
- the OH-type anion exchange resin pump 181 is operated, and the processing liquid in the clean liquid tank 122 is routed via the piping path. It is sent to the OH-type anion exchange resin tower 180 so that the conductivity (pH value) of the working fluid is kept near the above set value.
- the conductivity of tap water which is the processing stock solution
- the processing liquid in the tank 122 is passed through the H + type cation exchange resin tower 141 and the OH-type anion exchange resin tower 180, and the process of removing impurity ions is repeated.
- ion-exchanged water having a conductivity of 14 SZcm and a pH of 6.2 was produced.
- the conductivity of the liquid becomes SZcm or less, it is in a weak state (because processing has not yet started), so water was passed through the OH anion exchange resin tower 180 and the pH value was 9.5.
- the purified water refining section of the first embodiment uses a purified water refining tower made of a mixed resin of H + type cation exchange resin and OH_ type anion exchange resin, and the anticorrosion ion generation section is used.
- a machining liquid quality control device using an ion exchange resin tower and an electrolyzed water production unit consisting of a mixed resin of Na + type cation exchange resin and OH-anion exchange resin, and electric discharge machining equipped with this machining liquid quality control device The apparatus will be described.
- FIG. 12 is a schematic diagram of the configuration of the working fluid / liquid quality control apparatus according to the fourth embodiment of the present invention.
- the purifying unit 14 is made of a mixed resin of H + type cation exchange resin and OH- type anion exchange resin.
- the ion-exchange resin tower is composed of a purified water-repellent tower 14A, and the anti-corrosion ion generator 15 is composed of a mixture of Na + -type cation exchange resin and OH-anion exchange resin in the anti-corrosion ion generator 15.
- the working fluid liquid quality control device 10C of the fourth embodiment has a configuration in which the electrolyzed water production unit 15C and the acidic water storage unit 19 force S are added to the configuration of the second embodiment.
- each ion-exchanged resin used in the fourth embodiment the same one as shown in the second embodiment can be used.
- the same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
- the electrolyzed water production unit 15C electrolyzes water to generate acidic water (hereinafter referred to as acidic water) according to the following equation (11) on the anode side, and the following (12 ) To produce water having alkalinity (hereinafter referred to as alkaline water). Then, this alkaline water is used as a chemistry solution.
- acidic water water having alkalinity
- alkaline water water having alkalinity
- this alkaline water is used as a chemistry solution.
- a commercially available electrolyzed water production device such as an alkali & acidic ion generator (Aqua System Co., Ltd.) or an alkali ion water conditioner (Matsushita Electric Works Co., Ltd.). Can do.
- the acidic water storage unit 19 stores the acidic water generated on the anode side of the electrolyzed water production unit 15C.
- processing liquid / liquid quality control apparatus 10C of the fourth embodiment does not use acidic water.
- the stored acidic water is used for neutralization by mixing with alkaline water when the processing liquid in the processing liquid tank 12 is replaced.
- the working fluid is passed through the ion-exchange resin tower 15A to replace the metal ions with Na + to make a strong base, and then to the purified water resin tower 14A. Therefore, it is maintained so as to have a predetermined conductivity (pH value). Since the control of pH in this case is the same as that described in the second embodiment, detailed description thereof is omitted.
- FIG. 13 is a diagram showing an example of a configuration of an electric discharge machining apparatus including the machining liquid / liquid quality control apparatus of FIG.
- This electric discharge apparatus is an electric discharge machining unit 300 for performing an electric discharge machining process on a workpiece 301, and a machining liquid quality that circulates the machining fluid used in the electric discharge machining unit 300 for cleaning and reuse.
- the control unit 100C and force are also configured.
- the electric discharge machining apparatus according to the fourth embodiment generates alkaline water containing hydroxide ions, which are anticorrosion ions, in the machining liquid quality controller 100A of the electric discharge machining apparatus according to the second embodiment.
- Other components are the same as those of the second embodiment, and thus the same reference numerals are given and description thereof is omitted.
- the acid water produced by the electrolyzed water production unit 152 is stored in the septic tank 121 in this electric discharge machining apparatus.
- the processing by the electric discharge machining unit 300 is the same as that of the second embodiment, and thus the description thereof is omitted.
- the processing liquid containing impurities temporarily stored in the caloric processing tank 302 by the electric discharge machining process is guided to the sewage tank 121 and further filtered after the impurities are filtered.
- the subsequent machining fluid is stored in the clean liquid tank 122.
- the conductivity of the processing liquid in the clean liquid tank 122 is measured by the conductivity meter 130, and the measured result is sent to the switching control unit 170.
- FIG. 14 is a diagram showing a control operation by the switching control unit
- FIG. 15 is a diagram by the switching control unit. It is a flowchart which shows the procedure of a switching process.
- the conductivity (pH value) of the machining fluid In order to achieve a stable discharge force without damaging the anti-corrosion effect on the workpiece 301, the conductivity (pH value) of the machining fluid must be maintained at a predetermined value, The control unit 170 performs processing for that purpose. As shown in Fig. 14, when the measured value of the conductivity meter 130 is higher than the set value, the pure water refining pump 161 is operated and the anticorrosive refining pump 162 and the electrolyzed water pump 165 are stopped.
- the processing liquid in the clean liquid tank 122 is sent to the purified water resin tower 140 via the piping path. Also, if the measured value of the conductivity meter 130 during processing is lower than the set value, the purified water resin pump 161 is stopped and the anticorrosion resin pump 162 and the electrolyzed water pump 165 are operated, The processing liquid in the clean liquid tank 122 is sent to the anti-corrosion resin tower 150 and the electrolyzed water production department 152 via the piping route.
- the purified water pump 161 and the anticorrosive resin are used.
- the pump 162 is stopped, the electrolyzed water pump 165 is operated, and the processing liquid in the clean water tank 122 is sent to the electrolyzed water production unit 152 via the piping path.
- the switching control unit 170 determines whether or not the measured conductivity (pH value) of the machining fluid is higher than a predetermined set value (step S311), and the conductivity (pH value) of the machining fluid is determined. If it is higher than the predetermined set value (Yes in step S311), the pure water refining pump 161 is operated and the anticorrosion refining pump 162 and the electrolyzed water pump 165 are stopped (step S312). As a result, the processing liquid in the clean liquid tank 122 is sent to the purified water resin tower 140 via the piping path, and impurities ions such as metal ions generated by the discharge calorific process and carbonate ions by carbon dioxide in the atmosphere are removed. Remove and reduce the conductivity (pH value) of the working fluid.
- step S313 If processing is in progress (Yes in step S313), the pure water refining pump 161 is stopped and the anticorrosive refining pump 1602 and the electrolyzed water pump 165 are operated (step S314). As a result, in order to maintain the pH and not impair the anti-corrosion properties of the processing liquid, the processing liquid in the clean liquid tank 122 is sent to the anti-corrosion resin tower 150 and the electrolyzed water production unit 152 via the piping path, Keep the conductivity (pH value) of the working fluid around the preset value.
- step S313 the purified water pump 161 and anticorrosive oil pump 162 are stopped, and electrolyzed water pump 165 is operated (step S315).
- the pH value is maintained and the anticorrosive properties of the processing liquid are not impaired.
- the conductivity of the solution is higher than the above set value. If the value is lower, the conductivity (pH value) of the working fluid is kept near the preset value described above in order to maintain the pH value and not impair the anticorrosive properties of the working fluid.
- the working fluid in the presence of dissolved oxygen, is made alkaline using the conductivity meter 130, the purified water resin tower 140, the anticorrosive resin tower 150, and the electrolyzed water production section 152.
- WC—Co super hard materials
- Cu, Fe metal materials
- the machining fluid / liquid quality control device which is useful in the present invention, is a discharge calorific process in which the electrical discharge machining process performed in the machining liquid and the storage process after the machining process in the machining liquid are completed. It is useful for the processing method.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
Description
Claims
Priority Applications (5)
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US11/665,610 US7737380B2 (en) | 2005-05-23 | 2005-05-23 | Electrical-discharge machining apparatus and method and apparatus for dielectric-fluid quality control |
JP2006521339A JP4828420B2 (ja) | 2005-05-23 | 2005-05-23 | 加工液液質制御装置とその方法、および放電加工装置 |
CNB2005800381445A CN100537101C (zh) | 2005-05-23 | 2005-05-23 | 加工液液质控制装置与方法、以及放电加工装置 |
PCT/JP2005/009363 WO2006126248A1 (ja) | 2005-05-23 | 2005-05-23 | 加工液液質制御装置とその方法、および放電加工装置 |
DE112005002782T DE112005002782B4 (de) | 2005-05-23 | 2005-05-23 | Dielektrikum-Qualitätssteuervorrichtung und Funkenerosions-Bearbeitungsvorrichtung |
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PCT/JP2005/009363 WO2006126248A1 (ja) | 2005-05-23 | 2005-05-23 | 加工液液質制御装置とその方法、および放電加工装置 |
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US (1) | US7737380B2 (ja) |
JP (1) | JP4828420B2 (ja) |
CN (1) | CN100537101C (ja) |
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WO (1) | WO2006126248A1 (ja) |
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CN101056734A (zh) | 2007-10-17 |
US20070289925A1 (en) | 2007-12-20 |
JPWO2006126248A1 (ja) | 2008-12-25 |
US7737380B2 (en) | 2010-06-15 |
CN100537101C (zh) | 2009-09-09 |
JP4828420B2 (ja) | 2011-11-30 |
DE112005002782B4 (de) | 2009-09-10 |
DE112005002782T5 (de) | 2008-03-13 |
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