JPH012818A - Electric discharge machining equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field] The present invention relates to an electrical discharge machining device that uses a machining fluid containing an organic compound, and more specifically, to an ion exchanger that constitutes a resistivity maintenance device for the machining fluid. The present invention relates to an electrical discharge machining device equipped with an ion exchange resin regenerating device.

[Prior Art] FIG. 5 is an explanatory diagram showing an example of a machining fluid supply device of a conventional electric discharge machining apparatus that contains a machining fluid containing a white machine compound solution. In the figure, (1) is the main body of the machining equipment, and (2) is the machining fluid of organic compound solution, which is discharged after being used for electrical discharge machining in the main body of the machining equipment (1), and contains sludge inside. There is.

(11) is a machining fluid receiver for machining fluid (2), (12) is a return pipe, and (20) is a machining fluid tank. It flows into the machining liquid tank (20). (21)' is a waste liquid tank in the processing liquid tank (20), and (211) is a waste liquid in the tri liquid tank (21), which contains sludge. (22) is the filter element, (23) is the pump 1, and the sewage (211)
filter element (22) by pump 1 (23).
) and filter the sludge. (24) is the machining liquid tank (
(241) is the fresh liquid in the fresh liquid tank (24). Note that this tn liquid (241) is a processing liquid in which sludge has been filtered through a filter element (22).

(25) is the pump 2, which sends the dipping liquid (241) to the machining device main body (1) to perform electrical discharge machining. (30) is a resistivity maintenance device that maintains the resistivity of the fresh liquid (241) at a value suitable for electrical discharge machining, and is configured as follows. That is,
(31) is an ion exchanger, (311) is an anion exchange resin filled in the ion exchanger, and <312) is a mixed bed ion exchange resin, which is made from a mixture of anion exchange resin and cation exchange resin. It is used in place of the anion exchange resin (311). (313) is an ion exchange resin (3
It is a perforated plate that holds (11) or (312), and (4
2) is a deionized processing fluid. Furthermore, (32> is a resistivity sensor that detects the resistivity of the liquid (241), (33)
is a resistivity controller to keep the resistivity at a given value, (
34) is the pump 3, which sends the fresh liquid (241) to the ion exchanger (31) based on the command from the resistivity controller (33).

Incidentally, a mixed solution of glycol and sugar is generally used as the processing liquid (2) of the organic compound solution. In addition, the ion exchange resin is generally a general-purpose mixed bed type ion exchange resin, such as Amberlite MB-3■ (trademark s Ro
(Hereinafter, when Amberlite is used as the name of an ion exchange resin, it is a product name of Rohn & Ilass, and its explanation will be omitted.) However, according to the experimental method of Japanese Patent Application No. 62-018064 filed by the present inventors, by using an anion exchange resin such as Amberlite IRA410■ alone as the ion exchange resin, the above-mentioned Amberlite MB-3■ The lifespan of the ion exchange resin could be extended compared to when using the ion exchange resin. Amberlite MB-3■ is a mixture of cation exchange resin Amberlite 1R120B■ and the above-mentioned Amberlite IRA410■.

The operation of the conventional electric discharge machining apparatus configured as described above will be explained as follows. The machining fluid (2), which is an organic compound solution, used for electrical discharge machining in the machining equipment body (1) is
In addition to suspending machining fluid from electrical discharge machining as sludge, organic acids such as formic acid and acetic acid (R' C00H) whose solutes are decomposed and oxidized by the high heat of electrical discharge, as well as iron ions and organic acid ions, are A stable organic acid salt (M(R'C00)) consisting of
018084) and accumulates in the machining liquid receiver (11), flows through the return vibrator (12) and enters the dirty liquid WI (21). After settling coarse sludge in the sewage tank (21), the sewage (211) is sent to the filter element (22) by pump 1 (23), the suspended sludge is filtered, and then the sewage is sent to the clear liquid tank (24). Store in.

The fresh liquid (241) is sent to the machining device main body (1) by the pump 2 (25) and used for electrical discharge machining. Also, clear liquid (
241) is detected by a resistivity sensor (32). If the detected resistivity is smaller than the lower limit value preset in the resistivity controller (33), the pump 3 (34)
is driven, and part of the fresh liquid (241) undergoes ion exchange W (
31). The clear liquid (241) sent to the ion exchange W (31) is ion-exchanged using an anion exchange resin (311) or a mixed bed ion exchange resin (312), and then the deionized processing liquid (42) is It is returned to the fresh liquid tank (24). When the detected resistivity exceeds a preset upper limit, the pump 3 (34) stops.

In addition, when the specific resistance of the clear liquid (241) cannot be recovered to exceed the preset lower limit value, the ion exchange resin (
311) or (312) are replaced. In this case, regardless of whether the mixed bed ion exchange resin Amberlite MB-3■ or the anion exchange resin Amberlite 1RA410■ is used as the ion exchange resin,
The color of the resin should be brown when the ion exchange capacity is exhausted. However, the ion exchange resin (311) or (312) used in the resistivity maintaining device (30) turned black and was judged to be unrecyclable, so no attempt was made to regenerate it.

[Problems to be Solved by the Invention] Since the resistivity maintaining device of the conventional electrical discharge machining device is configured as described above, the resistivity of the machining fluid must be maintained within a set range, so the When the resistance became smaller than a set lower limit, it was necessary to replace the ion exchange resin with a new one. Another problem was that the consumption of expensive ion exchange resin was extremely large.

This invention was made to solve the above problems, and by chemically processing and regenerating the ion exchange resin used in the resistivity maintenance device, the ion exchange resin can be used repeatedly. The purpose of the present invention is to obtain an electric discharge machining device equipped with an ion exchange resin regeneration device.

[Means for solving the problem] The electrical discharge machining apparatus according to the present invention uses a machining fluid containing an organic compound, and circulates the clean fluid obtained by cleaning the used dirty fluid of this machining fluid. an ion exchanger that is connected to a fresh liquid tank of an electric discharge machining machine, and that is equipped with a machining liquid tank used for the process, and that is equipped with a resistivity maintenance device that controls the resistivity of the fresh fluid, and that constitutes the resistivity maintenance device; The above problem is solved by providing an ion exchange resin regenerating device connected to this ion exchanger to chemically activate the ion exchange resin of this ion exchanger.

[Function] In this invention, an ion exchange resin regeneration device is connected to an ion exchanger, which is the main component of a resistivity maintenance device that controls the resistivity of processed fluid, and normally the processed waste fluid is The solvent, that is, water, in the clear fluid that was treated to remove sludge is altered by the discharge heat of the organic compound that is the solute of the machining fluid. The deionized processing liquid, which has been ion-exchanged by the active ingredient of the ion exchange resin, is reduced to a clear liquid to compensate for the decrease in specific resistance.

However, as mentioned above, if the active ingredients of the ion exchange resin deteriorate due to long-term or large-volume use of the ion exchanger, the ability to produce pure water will be lost, and the fresh liquid will not be able to recover to the lower limit of the specific resistance that has been set. Eliminate functionality. In such a case, the operation of the ion exchanger is stopped based on the command of the resistivity controller, and the ion exchange resin is activated by chemical means, specifically an acid or alkaline solution, and other normalization treatments. Since the ion exchange resin is regenerated, the ion exchange resin filled in the ion exchanger is reactivated and regenerated and can be used repeatedly.

[Example] Embodiments of the invention will be described below with reference to the drawings.

In addition, in Fig. 1, Fig. 5 and in Fig. 2, Fig. 1
In the figure and FIG. 4, parts having the same functions as those in FIG. In Figure 1 (60
1) is an anion exchange resin regeneration device, which is the main part added to regenerate the anion exchange resin (311), and is configured as follows.

(61) is washing water, and tap water is usually supplied. (62
) is a cock 1 that controls the flow rate of the wash water (61) and opens and closes it. (63) is fresh liquid (241) and washing water (61)
The key-shaped three-way cock (64) is a liquid supply pipe S, which supplies fresh liquid (241) or washing water (61) from above the anion exchange resin (311). (65)
is backwash water and is usually supplied with tap water. (86) is cock 2 that adjusts the flow rate of backwash water (65) and opens/closes it.
, (67) is a T-shaped three-way cock, and the deionized processing liquid (
42) and backwash water (65).

(68) is the cock 3 that opens and closes the backwash water (65), (
71) is an alkaline liquid tank that usually stores 2 to 1O% (by weight) sodium hydroxide solution, (72) is an alkaline liquid (71)
This is the cock B that adjusts the flow rate and opens and closes the flow.

In FIG. 2, (602) is a mixed bed type ion exchange resin regeneration device, which is the main part added to regenerate the mixed bed type ion exchange resin (312), and is constructed as follows. (81) is an acid liquid tank, which usually stores 2 to 10% (by weight) hydrochloric acid or 0.5 to 696 (by weight) sulfuric acid. (
82) is a cock A that controls the flow rate of the acid solution (81) and opens and closes it. (91) is an air port that supplies compressed air, (92) is a cock G that adjusts the flow rate and opens/closes the air (64), and (93) is an air supply pipe;
is sent into the resin (312) and stirred and mixed. (101
) is a collector, and mixed bed ion exchange resin (312
) is placed at the interface when the two layers are separated, and an alkaline solution (
71), acid solution (81), wash water (61) and backwash water (
Collect and discharge 65). (102) is cook 4,
Open and close the collector drain fluid (l old).

A detailed explanation of the present invention configured as above is as follows. FIG. 3 is an explanatory diagram of the function and operation of the anion exchange resin regeneration device (801) of FIG. 1. (110) is said to be a pure water production process, but here we use an organic acid (+?' -COO1) that significantly lowers the specific resistance of the clear liquid (24+).
1) as iA-oo-+ a'-coon -RA-C
Ion exchange of OO-R'+I+20 is performed to produce a deionized processing fluid (42) with a high specific resistance. Here, RA-011- is an active ingredient of anion exchange resin,
When the RAOH-component decreases, the specific resistance of the clear liquid (241) cannot be recovered to the set lower limit value, and the production of the deionized processing liquid (42) is stopped and regeneration is performed.

(120) is a backwashing process, in which the backwash water (65) is
The turbidity component desorbed from the resin (411) is washed away by flowing at a flow rate that makes the volume of the resin (311) about 1.5 to 2 times that of the standing state. (130) is an anion exchange resin regeneration process,
By flowing alkaline liquid (71) from liquid supply pipe B (73), the resin used (1?-00C-R') is RA-
00C-R'+Na0Il-RA-O11'-+
l? ' - Regenerate COONa by ion exchange.

Conventionally, the anion exchange resin (311) used in the resistivity maintenance device (30) of an electrical discharge machine was replaced as it could not be recycled due to its significant deterioration.
I discovered that it can be played as shown below. (140) is a water washing process, in which washing water (61) is used to remove alkaline liquid (
Wash away the residue of 71).

Figure 4 shows the mixed bed type ion exchange resin regeneration equipment (60
2) is an explanatory diagram of the action/operation. (111) is said to be a general pure water production process, but here, the organic acid salt (M(R'Coo)) and organic acid (R'C00I+) contained in the fresh liquid (241) are converted to RB-11'' +M( R'
C00)n→(R) Mtenn-R' COO!
I and RA-011-+n R'-COOII→R-00C-R' + I+20 are ion-exchanged, and a deionized processing fluid with high resistivity (
42) is manufactured. Here, RB-11 is an active ingredient of the cation exchange resin, RA-Oll- is an active ingredient of the anion exchange resin, and M is a metal ion. RB-
When either 11+ or RA-011- decreases, the specific resistance of the clear liquid (241) cannot be recovered to the set lower limit value, and the production of the deionized processing liquid (42) is stopped and regeneration is performed. (121) is a backwash separation step, in which the backwash water (65) is used to increase the volume of the resin (312) from about 1.5 to
The flow rate is doubled to wash away the turbidity components desorbed from the resin (312) and to separate the anion exchange resin into two layers with the anion exchange resin in the upper layer and the cation exchange resin in the lower layer. (1
31) is the regeneration process of the anion exchange resin, and the liquid supply pipe B
Flow the alkaline solution (71) from the T-shaped three-way cock, and flow the backwash water (65) from the T-shaped three-way cock so that both liquids just collect in the collector (lot). R') to R-Coo-R' +
Na0II → RA-OH-10R' COONa is ion-exchanged and regenerated. (132) is the regeneration process of the cation exchange resin, in which the acid solution (81) is flowed from the cock A (82), and the washing water (B1) is flowed from the liquid supply pipe S (84).
) so that both liquids just collect in the collector, and use cation exchange resin + (RB). M) to (R)
M + HCII-n(Rn-1f”) 10M
The CF is regenerated by in-on exchange.

Conventionally, the mixed bed type ion exchange resin used in the resistivity maintenance device (30) of electrical discharge machines was replaced as it could not be regenerated due to its significant deterioration, but as described in Example 2, we have shown that it can be regenerated. discovered.

(141) is the water washing process, in which washing water (61) is flowed from the liquid supply pipe (B4) and backwash water (65) is flowed from the T-shaped three-way pipe (67) so that both liquids just collect in the collector (101). and drain, alkaline solution (71) and acid solution (81
) Wash away any residue. (151) is a resin mixing step, in which air (91) is blown from the air supply pipe (93) to mix the anion and cation exchange resins of the mixed bed type ion exchange resin (312).

Hereinafter, the experimental method, evaluation method, and results for regenerating the ion exchange resin used will be explained using Examples.

Example = 1 Regeneration experiment of anion exchange resin (1) Preparation of ion exchange resin used Electric discharge machining equipment: Non-flammable electric discharge machine (manufactured by Mitsubishi Electric) Machining fluid: Machining fluid of organic compound solution Work: Carbon steel for machine structure 355C Ion exchange resin: Amberlite 1RA410■5g-
Configuration of wet resin resistivity maintaining device; as shown in FIG.

Machining method: Operation was stopped when the specific resistance of the machining fluid reached 20 Ω· under standard operating conditions.

(2) Regeneration experiment of anion exchange resin Resin regeneration step: As shown in FIG. 2, the ion exchange resin used in section (1) was regenerated.

Alkaline solution: Composition NaOH 6% (weight) Flow rate (VS) 417Ω - Wet resin liquid m
15 II worth of samples: (1) 1RA410 New (2) Same as above Recycled product analysis method 2. Take 15rrl of each sample for analysis and use the usual method.
RA-11- was analyzed to determine the a-effective exchange capacity.

The results are shown in Table 1.

Table 1 Effective Exchange Capacity Analysis Results (3) Summary Resistivity Maintaining Devices (30) Previously Considered Non-Renewable
It was found that the anion exchange resin (411) used in

Example: 2 Regeneration experiment of mixed bed ion exchange resin (1) Preparation of ion exchange resin used Ion exchange resin same as Example 1 (1) except for the following matters: Amberlite MB-3 ■5Ω-wet resin ■ (7nha-light II? A410 Oh!, Hi1R
120Bot mixture) Specific resistance maintenance device configuration: As shown in Figure 2.

(2) Regeneration experiment of mixed bed ion exchange resin Resin regeneration process:
According to FIG. 3, the ion exchange resin used in section (1) was regenerated.

Alkaline solution: Composition Na0II 6% (heavy Q) Flow rate (SV
) 4 11/D-Wet anion exchange resin flow rate 7.51 Acid solution: Composition Ill! 6% (weight) flow velocity (SV”
) 4 II/II-Wet cation exchange resin flow rate 7.5g Analysis sample ■ (1) lRA410 New (2) Same as above Recycled product (Figure 4, cleaning process (141)
) (3) IR120B ■ New (4) Same as above Recycled product (Figure 4, cleaning process (141)
)Analytical Method Two analytical samples of 15 m each were taken and the exchange capacity was determined using a conventional method. The results are shown in Table 2.

Table 2 Effective Exchange Capacity Analysis Results (3) Summary Resistivity Maintaining Devices (30) Previously Considered Non-Renewable
It was found that the mixed-bed ion exchange resin (312) used in this study can be regenerated.

In addition, although the above description shows an electric discharge machining apparatus using an organic compound solution as a machining fluid, the present invention is not limited to this, and may be an electric discharge machining apparatus using an organic compound emulsion as a machining fluid. .

In addition, although the method of controlling the ion exchange resin regenerating device was not specifically described, it is also possible to electromagnetically control the flow rate and opening/closing of the channel, and even if such automatic operation means are adopted, It can be operated without any problems.

[Effects of the Invention] As described above, according to the present invention, an ion exchange resin regeneration device is added to the ion exchanger, and the ion exchange resin is regenerated when the specific resistance can no longer maintain the set lower limit value. Since it is configured so that it can be used repeatedly, there is no need to replace the expensive ion exchange resin each time, which has the effect of contributing to cost reduction.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram showing another embodiment of the invention, and Fig. 3 is an explanatory diagram of an anion exchange resin regeneration process using the apparatus shown in Fig. 2. , FIG. 4 is an explanatory diagram of a mixed bed type ion exchange resin regeneration process using the apparatus of FIG. 2, and FIG. 5 is an explanatory diagram showing an example of a conventional machining fluid supply device for an electric discharge machining apparatus. In the figure, (601) is an anion exchange resin regeneration device;
(311) is anion exchange resin, (61) is washing water, (
62) is cock 1, (63) is L-shaped three-way cock, (B4
) is liquid supply pipe S, (65) is backwash water, (66) is cock 2
, (67) is a T-shaped three-way cock, (6g) is cock 3, (
71) is alkaline liquid tank, (72) is cock B, (73)
The liquid supply pipe B1 (602) is the mixed bed type ion exchange resin regeneration device, (312) is the mixed bed type ion exchange resin, (81) is the acid liquid tank, (82) is the cock A, and (91) is the air port. , (9
2) is cock G, (93) is air supply pipe, (lot) is collector, (102) is cock 4, Figure 3 is anion exchange resin regeneration process, (110) is pure water production, (120)
is backwashing, (130) is anion exchange resin regeneration, (14
G) is water washing, Figure 4 is a mixed bed ion exchange resin regeneration process, (111) is pure water production, (121) is backwashing and separation, (131) is anion exchange resin regeneration, (141) is ) is cleaning of anion/cation exchange resin, and (151) is resin mixing. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In an electric discharge machining device that uses a machining fluid of an organic compound solution and is equipped with a resistivity maintenance device that controls the resistivity of the machining fluid, An electrical discharge machining device characterized in that it is equipped with an ion exchange resin regeneration device configured by chemical means.