JPH04141319A - Control device for work liquid quality of electric discharging work device - Google Patents

Abstract

PURPOSE:To reduce the deformation due to the dissolution of the surface of a work, by feeding a work liquid selectively to a cation exchange resin storage body and an anion exchange resin storage body respectively, and controlling the work liquid so as to be set to the specified pH. CONSTITUTION:This device is equipped with a work tank 11 of a work liquid interposed between an electrode 2 and a work 1, a cation exchange pump 29 and an anion exchange pump 32. A control part 123 actuates either the pump 29 or pump 32 so as to reduce this difference, in the case of the measurement value measured by a hydrogen ion exponent measuring means 34 having the difference more than the specified value compared with a preset hydrogen ion exponent. Moreover on this device, a cation exchange resin storage body 28 and an anion exchange resin storage body 31 are provided, a work liquid is fed selectively to each of them, and the work liquid is made to be set at the specified pH.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an IJIIT fluid quality control device for electrical discharge machining equipment.4 [Prior Art] Conventional machining fluid quality control device for electrical discharge machining equipment This will be explained using FIG. 9, taking a wire electrical discharge machining apparatus as an example. In FIG. 9, (1) is a workpiece [2] that is a wire electrode;
(3) is the bobbin on which the wire electrode is wound; (4)
, (5) is a pulley that changes the feeding direction of the wire electrode (2), (6) is a two-part nozzle, (7) is a lower nozzle, (
8) is a wire electrode collection box for collecting the wire electrode (2);
(9'), (Its) is from the bobbin (3) to the pulley (1), , l = two-part nozzle 6), the do-part nozzle
7) A wire electrode collection roller that feeds the stretched wire electrode (2) via the pulley (5) to the wire electrode collection box (8) and collects it once. (1, 1) is a machining tank that stores machining fluid, and in this machining tank, electric discharge is caused between the workpiece (1) and the wire electrode (2) through the machining fluid, and two steps are performed before discharge. be exposed. (12) is a machining liquid container, for example, the main body of the front two liquid control device. (13) is provided in the main body (I2) of the addition I-liquid control device;
11) is a hose for guiding the processing liquid to the waste liquid tank (13). (15) is the filtration pump, (16) is the filtration filter (17) is the filtration pump (15) and the filtration filter (16).
), and the machining liquid stored in the waste liquid tank (I2) is sucked by the filtration pump (15) and sent to the filtration filter (16) via the hose (17). (18) is a clear liquid tank that stores the processing liquid that has passed through the filtration filter (16), and the filtration filter (16) is disposed within this clear liquid tank (18). (19) is the sewage tank (
+3) and the quenching tank (18),
Both the dirty liquid tank (13) and the clean liquid tank (18) are arranged in the processing liquid quality control device main body (12). Reference numeral (20) is an ion exchange resin storage body in which a cation exchanger 13 such as a cation exchange resin is stored, and an anion exchanger 1 such as an anion exchange resin is stored. Note that the ion exchange resin housing (20) stores equal amounts of a cation exchange resin and an anion exchange resin. (21) is an ion exchange pump, (22) is an ion exchange pump (21) and an ion exchange resin storage body (20).
) is connected to the hose, and (23) is the control unit.1 The ion exchange pump (21) operates according to the command from the control unit (23), sucks the processing liquid from the fresh liquid tank (18), and pumps this liquid. The sucked up machining fluid is supplied to the ion exchange resin housing (20) through the hose (22). Note that the processing liquid that has passed through the ion exchange resin container (20) is returned to the clear liquid tank (18).
will be returned to. , (24) is a resistivity measuring means 1, such as a resistivity measuring device, for measuring the resistivity of the machining liquid in the clear liquid tank (18). (25) is a cable that transmits commands from the control section (23) to the ion exchange pump (21), and (26) is a cable that transmits signals from the resistivity measuring device (2/I) to the control section (23).

(27) is a part of the nozzle (6
) and a machining fluid jet pump for spouting between the workpiece (1) and the wire electrode (2) through the lower nozzle (7), (50) is pressurized by the machining fluid jet pump (27). Apply the machining fluid to the 1 part nozzle (6) and the F part nozzle (
7).

Incidentally, the addition L liquid is discharged from the two-part nozzle (6) and the lower nozzle (7) and then stored in the shelf tank (11).

Next, the operation of the wire electrical discharge machining apparatus shown in FIG. 9 will be explained.

A voltage is applied between the workpiece (1) and the wire electrode (2) to cause electric discharge to occur through the machining liquid ejected from the upper nozzle (6) and the lower nozzle (7), and the workpiece ( Processing proceeds by melting and removing the processed portion of 1). At this time, the discharge part of the wire electrode (2) also melts and deteriorates due to the discharge, so during machining, the bobbin (3) is placed so that a new wire electrode (2) is supplied to the machining part as the machining progresses. The wound wire electrode (2) is attached to a pulley (/I
), -1] part nozzle (6), lower nozzle (7), pulley (5), wire electrode rollers (9), (1,0), and continue to be sent to the wire electrode collection box (8).

- After the machining fluid spouted from the first part nozzle (6) and the lower nozzle (7) flows away the sludge generated in the machining part.

It becomes a state containing a lot of impurities, and -
Time can be saved.

The machining liquid in the machining tank (11) is led to the waste liquid tank (13) by a hose (14), and the process liquid in the waste liquid tank (13) is transferred to clean liquid via the hose (17) by a filtration pump (15). Tank (1
8) is sent to the filtration filter (16) located at 8). Therefore, the processing liquid from which impurities have been filtered by passing through the filtration filter (16) is stored in the clear liquid tank (18).

The resistivity of the machining fluid in the clean fluid tank (18) is measured by a resistivity meter (24), and the determined result is sent to the control unit (23) via the cable (2G).

If the measurement result of the resistivity measuring device (24) is lower than a preset value, the control unit (23) operates the ion exchange pump (21) and drains the i'i'l liquid tank (18).
The machining fluid is sent to the ion exchange resin storage body (20) via the hose (22), and metal ions generated by electrical discharge machining and carbon dioxide ions due to carbon dioxide gas in the atmosphere are removed, and the specific resistance of the machining fluid is reduced. raise to -. In addition, in order to perform stable electric discharge machining, the specific resistance of the machining fluid must be higher than a predetermined value (it: 7 stars, indicating that it is higher than i, and this condition is satisfied if the setting is 1irj, which is set in the summary described in 1-1). This enables stable electrical discharge machining.

In addition, if the specific resistance of the machining fluid becomes higher than the above-mentioned preset value, the ion exchange pump (21) is stopped to prevent the resistivity from increasing further, and the resistivity of the machining fluid is increased. ” - I try to keep it near the setting value that I have set as mentioned above.

Figure 10 is a table showing the control operations of the control unit (23). In Figure 1, the column (R100I) is the specific resistance measuring device (
If the measurement result of step 24) is lower than the preset value, the ion exchange pump (21) is operated, and the column (R1002) indicates that the ion exchange pump (21) is operated.

If the measurement result of the resistivity meter (24) is higher than the preset value mentioned in -, the ion exchange pump (24)
1) is to be stopped.

FIG. 11 is an operation flow diagram of the control operation of the control unit (23), and in FIG. 9, steps (S], 1
01), it is determined whether the specific resistance of the machining fluid is lower than a preset setting value, and if it is lower, step (
811,02), and if it is not low, proceed to step (S1
Proceed to step 103).

In step (31, 102), the ion exchange pump (21
) and return to step (S1101).

In step (S1103), the ion exchange pump (21
) and return to step (S1101).

Now, by exposing the workpiece (1) to the machining fluid,
A phenomenon occurs in which the material is dissolved by the processing fluid. The degree of dissolution is determined by the hydrogen ion index (hereinafter referred to as hydrogen ion index P) of the processing fluid.
The PI at which the degree of dissolution is the minimum does not necessarily reach a minimum when the PI (referred to as I-1) is 7, which is neutral, but varies depending on the material of the workpiece (1). For example, if the workpiece is copper, when the PTI is 9, the saturation ion meter is 1/100 of that when the PI-1 is 7, making it difficult to dissolve. Therefore, in this case, if processing is performed using a machining fluid with a pH of 9, PI-1 will be 7.
It is possible to reduce the deformation of the object (1) due to melting than when processing with a processing liquid of However, in conventional machining fluid quality control devices, the value of PH cannot be controlled arbitrarily, so it is not possible to minimize the degree of dissolution depending on the material of the workpiece (1). Ta.

In addition, if either cations or anions are generated more than the other during processing, one of the cation exchange resin and anion exchange resin in the ion exchange resin storage body (20) should be used first. A phenomenon occurs where one deteriorates while the other hardly deteriorates. Even in such a case, in the conventional system, the entire ion exchange resin container (20) was replaced, resulting in waste.

Note 2: Deterioration of ion exchange resin can be caused by using an ion exchange pump (2
1) is activated for a predetermined period of time, the specific resistance does not rise to the above-mentioned preset value.

1. Problems to be Solved by the Invention] The conventional pre-discharge 2. "Addition of the device"--liquid Since the liquid control device is configured as described above, the P I-F of the machining fluid can be adjusted freely.
Depending on the material of the workpiece (1), the workpiece (1) may be processed in a state where it easily dissolves in the machining fluid, and the workpiece (1) may be deformed due to melting. This invention was made to solve the above-mentioned problems, such as when either the ion exchange resin or the anion exchange resin deteriorates, the other must be replaced as well. The IJII of the liquid can be set arbitrarily, and when either the cation exchange resin or the anion exchange resin deteriorates, the discharge voltage can be used to replace only the deteriorated ion exchange resin. Addition of device - ``The purpose is to obtain a liquid-liquid control device.

"Means for Solving the Problems 1 A machining fluid quality control device for an electric discharge machining apparatus according to the present invention includes an electrode, a fluid adder [a fluid interposed between an object], a machining fluid container for storing the fluid, and a machining fluid that is removed from the machining fluid. A cation exchange means for removing ions and returning them to the processing liquid container; an anion exchange means for removing anions from the IJII IT solution and returning them to the processing liquid container; A first addition means for supplying two liquids; a second addition means for supplying the liquid to the anion exchange means; a second addition means for supplying the liquid to the anion exchange means; When the measured values measured by the ion index measuring means and the hydrogen ion index measuring means have a predetermined difference (11i to 1-) compared to the preset hydrogen ion index, the first step is performed to reduce this difference.
．． The machining liquid supply control means for operating one of the second and second liquid supply means is provided.

[Effect]

1. A machining fluid quality control device for an electric discharge machining apparatus configured as described above includes a cation exchange resin storage body for storing a cation exchange resin and an anion exchange resin storage body for storing an anion exchange resin. , the machining fluid is selectively supplied to each of the machining fluids, and the machining fluid is set at a predetermined f' T-1. A description will be given with reference to FIG. 1, which shows the configuration of a wire electrical discharge machining apparatus to which one embodiment of the present invention is applied. In Figure 1, (1) to (+9),
(24'), (26), and (27) are the same as those marked with the same symbol in FIG. 8, so their explanation will be omitted. In FIG. 8, (2g) is a cation exchange means 9 in which a cation exchange resin is stored, for example, a cation exchange resin storage body 3, and (1, 23) is a processing fluid supply control means 1, for example, a control section. be. (29) is the first processing fluid supply control means 1, for example, a cation exchange pump. (30) is a hose that connects the cation exchange pump (29) and the cation exchange resin storage body (28);
29) is activated by a command from the control unit (123), sucks the machining fluid from the soaking liquid tank (18), and stores the machining fluid in the cation exchange resin via the hose (30). The processing liquid that has passed through the cation exchange resin container (28) is supplied to the soaking liquid tank (+8) again.
will be returned to.

(31) is an anion exchange means 1 in which an anion exchange resin is stored, for example, an anion exchange resin storage body. (3
2) is the second processing liquid supply means 1, for example, an anion conversion pump. , (33) is an anion exchange pump (32)
and the anion exchange resin housing (31), and the anion exchange pump (32) is connected to the control unit (1, 23).
), the machining fluid in the 1lII liquid tank (18) is sucked up, and the sucked up machining fluid is passed through the hose (
33) to the anion exchange resin storage body (31). Note that the processing liquid that has passed through the anion exchange resin container (31) is returned to the clear liquid tank (18) again.

(34) is a hydrogen ion index measuring means 1, such as I) I-1 measuring device, for measuring the pH of the processing liquid in the fresh liquid tank (18).

(35) is a control unit (12) that transmits the signal from the IH measuring device (34).
3), (36) is the control unit (12: l
d) is a cable that transmits commands from the cation exchange pump (29); (37) is a cable that transmits commands from the controller (1, 23) to the anion exchange pump (32);

Next, the operation of the wire electrical discharge machining apparatus to which an embodiment of the present invention shown in FIG. 1 is applied will be explained.

Machining of the workpiece (1) by electric discharge between the workpiece (1) and the wire electrode (2), feeding and recovery of the wire electrode (2), machining liquid in the machining tank (11) ), the processing liquid in the waste liquid tank (13) is supplied to the waste liquid tank (13) through the filtration pump (15) and the filtration filter.

and a hose (17) to filter the fresh liquid tank (18).
), and the operation in which the machining fluid in the fresh liquid tank (18) is returned to the machining tank (11) via the upper nozzle (6) and the lower nozzle (7) by the machining fluid jet pump (27). Since the operation is similar to that of the conventional example, the explanation will be omitted.

The operation of the cation exchange pump (29) and the anion exchange pump (32) will be explained with reference to FIG. 2.

Figure 2 shows that under the control of the control unit (+23), the 7 cation exchange pump (29) and anion exchange pump (32) respond to the specific resistance of the machining fluid and the pH of the machining fluid. This is a list of how it works.

In FIG. 2, l (R201) is the cation exchange pump ( 29) and the anion exchange pump (32) are shown operating.

Columns (R202) and Columns (R203) respectively indicate that when the measured value of Pl is within the double set range, and also when it is higher than the upper limit of the set range set above, Similarly to column (R201), if the measured value of specific resistance is lower than the preset value described above, it indicates that the cation exchange pump (29) and the anion exchange pump (32) are to be operated.

Column (R204) indicates that the measured value of resistivity is higher than the preset value set above, and 1) If the measured value of I( is lower than the lower limit of the set range preset as described above), , indicates that the cation exchange pump (29) is stopped (1-) and the anion exchange pump (32) is activated.

Column (R205) indicates that if the measured value of resistivity is higher than the set value set above, and the measured value of PH is within the set range set above, the cation exchange pump (29 ) and anion exchange pump (32) are both shown to be stopped.

Column (R206) indicates that the measured value of specific resistance is higher than the preset value set in 112. The measured value of PI-1 is -
1- If the value is higher than the upper limit of the preset setting range mentioned above, activate the cation exchange pump (29).

This indicates that the anion exchange pump (32) is to be stopped.

As shown in Figure 2, when the specific resistance of the machining fluid is low and a large amount of cations and anions are present in the machining fluid, the cation exchange pump (29) and the anion exchange pump (32) 2. Activate to remove cations and anions at the same time, and continue this operation until the resistance is equal to the set setting fi + 1. 3. Also, If the measured value of resistivity is higher than the pre-set setting 1-111''1, measure 1] Change the operation of the ion exchange pump (32).

In other words, if the pH measurement value is lower than the lower limit of the preset range, the cation exchange pump ( 29) is stopped, and only the anion exchange pump (32) is operated, and the value of I-1 is set to 1-Y1.
', Let.

In addition, if the Pil measurement is within the setting range specified in 1-1, the specific resistance may be higher than the setting value specified in 1-1). Since the caulking is within the set range, the cation exchange pump (29) and the anion exchange pump (32) are stopped to maintain this state.

Furthermore, if the measured value of PI-I is higher than the -L limit of the preset setting range described in 1-1, lower the PI-I and adjust the PI-1 to within the preset setting range. The cation exchange pump (29) is operated and the anion exchange pump (32) is stopped so that

FIG. 3 is an operation flowchart showing the control of the control section (+23) shown in FIG. 2.

In FIG. 3, in step (S301), depending on whether the specific resistance is lower than a preset value, if it is lower, the process proceeds to the next step (S302), and if it is higher, the process proceeds to step (S303).

In step (S302), the cation exchange pump (29
) and the anion exchange pump (32) and return to step (8301) 3. In step (S303), PI-T is determined to be lower than the lower limit of the preset setting range. If it is lower, step ( Proceed to S30・1), and if it is not low, proceed to step (S305')1, step (S30/[
), the cation exchange pump (29) is stopped and 1 (2) the ion exchange pump (32) is activated and the process proceeds to step (S301). 1 of the caulked setting range
If it is 3Xi, step (8
306), and if height < f, cIL1, step (S
Proceed to step 307), step 1 (S: (06) activates the cation exchange pump (29) and stops the anion exchange pump (32) +I-).
), in step 1 (S307), cation exchange pump (29), ++z io/exchange pop (32) (
1 and return to step (830]') 1. Figures 4 and 4 show the P
It is an explanatory diagram showing an example of control of a cation exchange pump (29) and an anion exchange pump (32) in a case where the setting of I-1 and the specific resistance are higher than a preset setting value.

The upper limit of the setting range is the PI-1 value, which is the center value of the setting range, and the PI-(value, which is the center value of the setting range described in 4. P subtracted 1 from
[-■ Shows an example where the value is the lower limit of the setting range.

In FIG. 4, (401) is a PI-1 setting switch 1. This PI-1 setting switch sets a setting range for preliminary setting.

(401a) is a switching contact provided on the Pl-1 setting switch (401), and (401b') is a common contact provided on the I) If setting switch (401). The common contact (401b) is the Pl-I setting switch (401)
There is one switching contact (401, a), and there are multiple switching contacts (401, a). One manual common contact (401b) is a switching contact (401fl).
It is switched and connected to one of the following.

The code (401) attached to each switching contact (4[]1a)
c) is either the passing point (401b) or the switching contact (401
When connected to a), P becomes the center value of the setting range.
T (value is displayed.

In addition, based on the connection point (401b) and the PtT measuring device (34) force output, < P II /II
II constant fir''i has been input.

(402) is a subtracter that subtracts the PH value, which is the center value of the setting range described above, from the PI (measured value) and outputs the subtraction result (n).This subtracter is connected to the switching contact ( 401
a), and a PI-1 setting switch (
401), the corresponding one of the subtracters is activated. Subtraction result (n
) is input to the magnitude determination section (II, 103). The size determination unit (H/103) determines whether the subtraction result (n) is smaller than 1 or not, and when it is smaller than -1, it operates the anion exchange pump (32) and also activates the cation exchange pump (29). make it stop. Also.

When it is greater than -1, the subtraction result (n) is further input to the magnitude determination section (1-1404).

The size determination unit (Ti2O3) determines whether the subtraction result (n) is greater than 1, and if it is greater than I, it operates the cation exchange pump (29) and operates the anion exchange pump (29).
32).

Also, if it is less than 1, the cation exchange pump (29)
and the anion exchange pump (32) are both stopped.

In either case, the cation exchange pump (29) and the anion exchange pump (32) are activated or stopped.
After that, in order to perform the control shown in Fig. 2 again, the third
Returning to step (S301) in the figure, the specific resistance is measured.

In addition, if the resistivity does not rise to the preset value within a predetermined period of time and the measured value of PH does not change, replace the cation exchange resin and anion exchange resin. Assuming that both the resins have deteriorated, it is sufficient to replace both the cation exchange resin housing (28) and the anion exchange resin housing (31).

Furthermore, if the measured pH value is higher than the upper limit of the preset setting range after a predetermined time, it is assumed that the cation exchange resin has deteriorated, and the cation exchange resin storage body (28) can be replaced. If the measured pH value is lower than the lower limit of the preset setting range, it is assumed that the anion exchange resin has deteriorated, and the anion exchange resin container (3
1) should be replaced.

Example 2 Note that in Example 1 described above, 1it (R201
), the measured value of resistivity is lower than the preset setting value, and the measured value of PI-I is lower than the lower limit of the preset setting range (R203).
As shown in Figure 2, in any case where the measured value of resistivity is lower than the preset set value and the measured value of PH is higher than the upper limit of the preset set range, the cation exchange pump (29) Both the anion exchange pumps (32) are operated, but when the measured values of resistivity and PH meet the conditions in column (R201), the cation exchange pump (29) is stopped and the anion exchange pump (29) is operated. Only the ion exchange pump (32) is operated, and the measured value of specific resistance and the measured value of P f (flit (R203
), only the cation exchange pump (29) may be operated and the anion exchange pump (32) may be stopped.

FIG. 5 is a table showing the operation of the control section (23) in this case. In the figure, columns (R501) to (R50
6) corresponds to columns (R201) to II (R206) in FIG. 2, and column (R501) and column 4? 503) are the column (R201) and column (R201) in FIG. 2, respectively, as described above.
203), but column (R502) and column (R5
04) ~ Columns (R506) are the columns (R506) in Fig. 2, respectively.
R202).

This is the same as columns (R204) to (R206).

FIG. 6 is an operation flow diagram of the control section (123) shown in FIG. 5.

In step (S601.) in FIG. 6, it is determined whether the measured value of PH is smaller than the lower limit of a preset setting range. If it is smaller, the process proceeds to step (S602); if not, step (S 603).

In step (S602), the cation exchange pump (2
9) is stopped, the anion exchange pump (32) is activated, and the process returns to step (S601).

In step (S603), it is determined whether the measured value of PH is larger than the 1-limit of a preset setting range. If it is larger, the process proceeds to step (S604), and if it is not larger, the process proceeds to step (S605). ).

In step (S604), the cation exchange pump (29
), the anion exchange pump (32) is stopped, and the process returns to step (S601).

In step (S605), the measured value of specific resistance is determined.

It is determined whether or not it is larger than a preset setting value. If it is larger, the process proceeds to step (S606), and if it is not larger, the process proceeds to step (S607).

In step (3606), the cation exchange pump (29
) and anion exchange pump (32) and return to step (8601).

In step (S 607), the cation exchange pump (2
9) and the anion exchange pump (32), and return to step (S601).

FIG. 7 is an explanatory diagram of the second embodiment corresponding to FIG. 4 showing the first embodiment. Although FIG. 4 is an explanatory diagram for the case where the specific resistance is higher than a preset value (2G), FIG. 7 is applied regardless of the value of the specific resistance.

FIG. 7 shows that if the determination result n of the size determination unit (H404) is not greater than 1, step 7 (S60) shown in FIG.
Proceed to step 5), and if n is larger than 1 or if the judgment result n of the one-person small judgment section (f-f 403 ) is smaller than -1, the cation exchange pump (29) and the anion exchange pump (32) After activation or deactivation, the process of returning to step (S60] shown in FIG. 6 to perform the control shown in FIG. 5 again is the same as that in FIG. 71.

As shown in FIG. 6, step (S601) to step (S60/I) bring the PH (direction) within the above-mentioned preset setting range, and then step (S605) to step (S606) Resistance -
1- Control is performed so that the settings are as specified above. 1 Therefore, in this Example 2, when the specific resistance is lower than the preset setting value, 1)
Since the value of I-1 falls within the predetermined setting range described in -1-, there is an effect that the deviation in the value of I during this period can be reduced.

Example 3 Also, Example 1. In Example 2, the cation exchange resin container (28) and the anion exchange resin container (31)
), a cation exchange pump (29) and a 1 f ion exchange pump (32) are used, respectively, or one ion exchange pump is used as shown in Figure 8. , the υ111-liquid may be selectively supplied to the cation exchange resin container (28) and the anion exchange resin container (31) by switching with a solenoid valve. .

In Fig. 8, (81) is an ion exchange pump, (8
2) is the first solenoid valve, (83) is the second solenoid valve 7,
When the first solenoid valve (82) is activated and the second solenoid valve (83) is not activated, when the ion exchange pump (81) is activated, the two liquids in the soaking liquid tank (18) are pumped into the cation exchange resin container. (28), cations are removed, and 11 immersion liquid m (
Returned to +8'1. In addition, when the first solenoid valve (82) is not activated and the second solenoid valve (83) is activated, and the ion exchanger pump (81) is activated, the processing liquid in the fresh liquid tank [18] is filled with anion exchange resin. The liquid is supplied to the storage body (3I), anions are removed, and the liquid is returned to the clear liquid tank (I8).Ion exchange occurs when the first solenoid valve (82) and the second solenoid valve (83) are operated. When the pump (81) operates, the liquid flows into the cation exchange resin container (28) in front of the clear liquid tank (18).
) and supplied to the anion exchange resin storage body (31),
Cations and anions are removed and returned to the clear liquid tank (18).

In this third embodiment, since only one ion exchange pump is required, the processing fluid quality control device can be downsized and can be constructed at low cost.

"Effects" This invention is configured as described in 1-1 below, and selectively supplies processing fluid to each of the cation exchange resin storage body and the anion exchange resin storage body, and
'Liquid can be set to predetermined I)II. As a result, deformation of the workpiece due to surface melting can be reduced, and when replacing the ion exchange resin, either the cation exchange resin storage body or the anion exchange resin storage body that has lost its ion exchange ability can be replaced. This has the effect of reducing the cost of maintaining the quality of the machining fluid.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a wire discharge presser to which embodiments 1 and 2 of the present invention are applied. 2 to 4 are diagrams showing Embodiment 1 of the present invention. FIG. 2 is a diagram showing the control operation - Keno, FIG. 3 is a control operation flow diagram, and FIG. 4 is a diagram showing the control operation. Figures 5 to 7, which are explanatory diagrams of settings and control operations, are diagrams showing a second embodiment of the present invention. FIG. 7 is an explanatory diagram of PH setting and control operation. FIG. 8 is a flowchart showing Embodiment 3 of the present invention. 1. FIG. 9 is a conventional pressurized liquid quality diagram. 3, which is a configuration diagram of a wire electrical discharge machining apparatus equipped with a control device, and FIGS. 10 to 11 are diagrams showing conventional machining fluid quality control, and FIG. 10 is a diagram showing control operation - Keno. 7 Figure 11 is a control operation flow diagram. In the figure, (12) is the machining fluid quality control device main body (2
8) is a cation exchange resin storage body, (29) is a cation exchange pump, (31) is an anion exchange resin storage body, (
32) is an anion exchange pump, (34) is a pH meter, and (123) is a control unit. In addition, in FIG. 9, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A machining fluid container interposed between the electrode and the workpiece to store a machining fluid, a cation exchange means for removing cations from the machining fluid, and an anion exchange means for removing anions from the machining fluid. a first machining fluid supply means for supplying the machining fluid in the machining fluid container to the cation exchange means; a second machining fluid supply means for supplying the machining fluid in the machining fluid container to the anion exchange means; A hydrogen ion index measuring means for measuring the hydrogen ion index of the processing fluid; If the measured value measured by the hydrogen ion index measuring means differs from a preset hydrogen ion index by a predetermined value or more, this difference occurs. The above first
A machining fluid quality control device for an electric discharge machining apparatus, comprising: machining fluid supply control means for operating either of the second machining fluid supply means. (2) The machining fluid supply control means has a resistivity measuring means for measuring the resistivity of the machining fluid, and when the measured value measured by the resistivity measuring means is smaller than a preset resistivity, the machining fluid supply control means controls the , operating both of the second machining fluid supply means;
The measured value measured by the specific resistance measuring means is larger than the preset specific resistance; 2. The machining fluid quality control device for an electric discharge machining apparatus according to claim 1, wherein when there is a difference, either the first or second machining fluid supply means is operated so that the difference is reduced. (3) The machining fluid supply control means has a resistivity measuring means for measuring the resistivity of the machining fluid, and the machining fluid supply control means is configured such that the measured value measured by the resistivity measuring means is smaller than a preset resistivity, and that hydrogen If the measured value measured by the ion index measuring means has a difference of more than a predetermined value compared to a preset hydrogen ion index, either the first or second processing fluid supply means is operated to reduce this difference. and when the measured value measured by the resistivity measuring means is larger than a preset resistivity, both the first and second machining fluid supply means are operated. A machining fluid quality control device for the electric discharge machining apparatus described above. (4) The first machining fluid supply means is provided in an ion exchange pump that sucks the machining fluid from the machining fluid container and a machining fluid feed path that supplies the machining fluid sucked up by the ion exchange pump to the cation exchange means. a first solenoid valve,
The second machining fluid supply means includes the ion exchange pump and a second machining fluid supply path that supplies the machining fluid sucked up by the ion exchange pump to the anion exchange means.
4. A machining fluid quality control device for an electric discharge machining apparatus according to claim 1, further comprising a solenoid valve.