JPS63185526A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To aim at enhancing the life of machining oil and at reducing the running cost by charging anion exchange resin, solely in an ion exchanger constituting a specific resistance maintaining device so as to remove anionically deteriorating products which lower the specific resistance of deteriorated machining liquid. CONSTITUTION:Ionically deteriorating products in deteriorated machining liquid have hydrogen ions and ferric ions exhibiting acid as main component when they are cations, but have organic acid ions such as formic acid ions or acetic ions as main components when they are anions. Generally, ions causes the specific resistance of deteriorated machining liquid to be remarkably lowered. If the forming acid ions form organic acid consisting of hydrogen ions and organic acid ions, the specific resistance of the machining liquid is remarkably lowered. Accordingly, if anion exchange resin 411 is charged in an ion exchanger 41, it coexists with the ferric ions so that the organic acid ions forming stable polynuclear complex salt are not removed. Accordingly, it is possible to enhance the life of machining liquid and to reduce the running cost.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric discharge machining device using an organic metal solution 1K27D working fluid, and more specifically, to an improved ion exchanger constituting a resistivity maintenance device. The present invention relates to electric discharge machining equipment.

[Conventional technology]

FIG. 8 is an explanatory diagram showing an example of a machining fluid supply device for an electrical discharge machining apparatus using a conventional organic compound solution as the machining fluid. In the figure, (1) is the processing equipment main body, (2) is the processing liquid of organic compound solution, and the processing equipment main body (1) is released [1].
After being used for zero milling, it is discharged and contains sludge. Uυ is the machining fluid receiver for machining fluid (2), (2) is the return pipe, and the handle is the machining fluid tank.
'[! (2) flows from the raw processing liquid receiver (6) through the return pipe 4 and enters the processing liquid tank (1). (to) is a sewage tank, 121
1) is the sewage in the sewage tank Q, which contains slurry. (A) is the filter element, and the wire is the pump 1. The dirt (211) is sent to the filter element 4 by the pump 10, and the filter element 4 is sent to the filter element 4. Filter. (c)
is the clear liquid tank, (241J is the clear liquid in the clear liquid tank (to).

Note that this clear liquid (241J is the processing liquid after the slurry is filtered by the filter element
Then, the clear liquid (241) is sent to the main body (1) of the processing apparatus to perform the discharge process.

C3°C is a mixed bed ion exchanger, (811) is a filter mixed bed ion exchange resin consisting of a cation exchange resin and an anion exchange resin filled in the mixed bed ion exchanger C11), (
(to) is a resistivity sensor that detects the resistivity of the fresh liquid 1241J, (g) is a resistivity controller that keeps the resistivity at a given value of 1, and (to) is a pump (3) that detects the resistivity. Resistance controller (
Based on the command from (to), the clear liquid (241) is sent to the mixed bed type ion exchanger θM. These nine-bed ion exchanger 6η, mixed-bed ion exchange resin (: (11), resistivity sensor (to)
, the resistivity controller (to), and the pump 804 constitute a resistivity maintenance device (to).

By the way, in general, processing liquid (2) of organic compound solution and L
7. A mixed solution of glycol and sugar is used.
Mixed-bed ion exchange resin (311J is a general-purpose ion exchange resin, such as Amberly), MB-8
(2) is a mixture of Amberlite 1it-120B (2), a strongly acidic cation exchange resin, and Amberlite 1liA410 (2), a strongly basic anion exchange resin.

The operation of the conventional electric discharge machining apparatus constructed as described above will be explained as follows. Machining fluid (2), which is an organic compound solution, is used for electrical discharge machining in the machining equipment body (1).
suspends the slurry and collects it in the machining liquid receiver (2),
It flows through the return vibrator ■ and enters the sewage tank elD.

After settling the coarse sludge in the sewage tank (2), the sludge (211) is sent to the filter element by the pump 1 (2), and the suspended sludge is filtered and then transferred to the clear liquid tank. Save in @. Clear liquid (241J is pump 2@
is sent to the machining device main body (1) and used for electrical discharge machining. The specific resistance of the matte liquid (241,) is detected by a specific resistance sensor (241). When the detected resistivity is smaller than the lower limit value preset in the resistivity controller (to), the pump 8r34 is driven and a part of the ion exchanger OD is sent to the mixed bed ion exchanger OD. The purified liquid t241) sent to this mixed bed type ion exchanger 01) was subjected to ion exchange using a mixed bed type ion exchange resin (811J).

It is returned to the fresh liquid tank (c). When the detected resistivity exceeds a preset upper limit by one time, the pump 8C34 is stopped. Note that when the specific resistance of the RF4 liquid (241J) cannot be recovered to exceed a preset lower limit value, the mixed bed type ion exchange resin 1811J is replaced.

[Problem that the invention seeks to solve]

Mixed bed ion exchanger C1υ configured as above and used in resistivity maintenance device 1 (to) of conventional electrical discharge machining equipment
According to the authors, without elucidating the eight deteriorated can bottoms in the machining fluid due to electrical discharge machining, general-purpose products are used. There was a problem in that the GD had to be replaced.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain an electric discharge machining apparatus having a resistivity maintaining device with a long life.

[Means for solving problems]

The electric discharge W process device according to the present invention is a single unit in which the anion R exchange resin is individually filled with respect to the resistivity maintenance device + mg ion exchanger.

[Effect]

In the present invention, by filling the ion exchanger solely with an anion exchange resin, anionic degraded can bottom materials that significantly reduce the resistivity of degraded processing fluid are removed.

[Embodiments of the invention]

FIG. 1 is an explanatory diagram of a resistivity maintaining device showing an embodiment of the present invention. Note that parts having the same functions as those in FIG. 8 are given the same reference numerals, and explanations thereof will be omitted. In the figure, the older sister is an ion exchanger, and (411) is an anion exchange resin filled in the ion exchanger (AD).

FIG. 2 is a diagram showing the results of measuring the life of an ion exchange column by the column method shown in Example 2, which will be described later. The horizontal axis shows the effluent as 1, and it is expressed as a relative value with the outflow source where the specific resistance of curve A is 20Ω・1 as 1. The vertical axis shows the specific resistance, and the unit is Ω・1. 0 curve A is the case of the ion exchanger @υ according to the present invention, filled with anion exchange resin Amberlite 111Δ410■.
! This is the result.

Curve B shows the case of a conventional mixed bed type ion exchanger (1), and is the result of one measurement filled with mixed bed type ion exchange resin Amberite MB-90. Amber light Ml here
-13■ is the cation exchange M[fJl? amber light l
K120B■ and anion exchange resin Amberlite t, t
It is a mixture with ta41-. In FIG. 2, the life of the ion exchange resin is shown by the amount of the effluent until the specific resistance of the Mε effluent becomes 20Ω·1.

Next, Examples 1, 2 and 3 will be shown below to specifically explain the content of the present invention. In Example 1, an analysis was conducted to elucidate the ionic deterioration of the machining fluid caused by electrical discharge machining using an organic compound solution. In addition, in Example 2, the life span of an ion exchange column packed with an anion exchange resin and a mixed bed type ion exchange column packed with a mixed bed type ion exchange resin was measured using a column method.

Furthermore, in Example 8, an organic compound solution was used as the processing fluid! Using the t2JD equipment, we measured the lifespan of an ion exchanger filled with anion exchanger and a mixed bed ion exchanger filled with mixed bed ion exchange resin.

Example 1 Analysis of ionic deterioration products in degraded machining solution Top solution: Machine solution working fluid Work: Charcoal Shido 855C for machine structures Processing conditions: Tablet operating conditions met, resistivity maintenance device stopped One child remains.

Machining jl & = approx. 9g Specific resistance at the end of sword O work = 15Ω・α Specific resistance: Conductivity meter (Toa Radio Group) P■: Crow electrode PM meter (manufactured by Horiba) Iron ion: Atomic absorption photometer (Japan Petri dish) 1 S. A. S. & I) Anion: Ion chromatography (L)lLJNEX
Production (3) Analysis results table 1 Degraded processed liquid analysis results Example 2 Ion exchange column crowding measurement by column method (1)
Measurement method: Prepare an ion exchange column by filling the column with the specified ion exchange resin. While the degraded steel liquor was flowing from the top of the column, 10ffiA of effluent was collected at every fixed amount of effluent, and the specific resistance was measured.

(2) Experimental conditions Column: Glass column internal diameter 12.6 fl Ion exchange resin amount: Total amount 20 m1 Ion exchange resin A: Anion father exchange resin i Amberlite IRA410 B: Mixed bed ion exchange resin; Amberlite MB-30
(w!I ion exchange resin Amberlite lR129B■
and anion exchange resin Amberlite I) LA410■ Mixture J(3) Measurement results The 1ull determination results are as shown in FIG.

Example 8 Measuring the life of an ion exchanger using a TJa processing device using an organic compound solution as a processing fluid.

(1) Ion exchanger life measurement release! Uko equipment: Nonflammable electrical discharge machine (manufactured by Mitsubishi Electric) Specific resistance maintenance equipment Experiment 1: This is the equipment of the present invention shown in Fig. 1, in which the ion exchanger (6) was filled with amber as an anion exchange resin (411). It was filled with A410.

Experiment 1; This is the conventional apparatus shown in Figure 3, in which Amberlite MB-8■ (cation exchange resin Amberlite 1R120B■) and anion exchange resin tatt) were used in the mixed bed ion exchanger 01). Filled with 1 bottle of ion exchange resin Amberlite IRA 410 (mixture with 410).

Machining fluid - Machining fluid of organic compound solution (mixed solution of glycol and sugar) Carbon steel for mechanical structure 8550 Machining conditions: Wi city operating conditions Life measurement: The specific resistance of the machining fluid becomes 20 and cannot maintain Ω・1. The work performance up to this point is expressed as a relative value using the value of Experiment 1 as the base 1.

(2) Experimental Results Table 2 Ion Exchanger Life Measurement Results A detailed explanation of the present invention, which is constructed as described above, is as follows. As shown in Example 1, as ionic degradation products in the degraded processing fluid, cations are mainly acidic hydrogen ions and iron ions, and anions are organic acid ions such as formate ions and acetate ions. It is the main component.

First, trace amounts of inorganic ions such as chloride ions and sulfate ions are dissolved as impurities in the water or contaminants from the environment. In general, ions cause a decrease in the resistivity of degraded machining fluids. However, when organic acid ions form an organic acid consisting of hydrogen ions and organic acid ions, the specific resistance of the degraded processing fluid decreases significantly, but it becomes stable when iron ions and organic acid ions coexist. If a polynuclear complex salt is formed, it will not cause a significant decrease in the resistivity of the degraded processing fluid. In FIG. 2 of Example 2, the life of curve A, which is the measurement result when the anion exchange resin according to the present invention is packed in the column alone, is the same as that when the conventional mixed bed type ion exchange resin is packed in the column. The reason why the lifespan of curve B, which is the measurement result, is about 2.2 times is explained as follows. In the case of curve A, the anion exchange resin exchanges free organic acid ions and inorganic anions contained as organic acids in the degraded processing fluid with hydroxide ions, removes them from the fluid, and causes the exchanged t hydroxylated The compound ions react with hydrogen ions in the liquid to generate water, thereby increasing the specific resistance of the degraded machining liquid. (Sh) In the case of anion exchange resin alone, organic acid ions that coexist with iron ions to form stable polynuclear complex salts in the degraded processing fluid are not removed. In the case of curve B, the mixed bed ion exchange resin has a cation exchange resin that is a stable polynuclear lead salt formed from iron ions and organic acid ions, and exchanges iron ions with hydrogen ions in the liquid. The hydrogen ions removed and exchanged react with organic acid ions in the liquid to produce organic acids. The anion exchange resin, which is its component, removes all organic acid ions and inorganic anions, including the generated organic acids, by exchanging them with hydroxide ions.
The exchanged hydroxide ions react with hydrogen ions in the liquid to generate water, thereby increasing the specific resistance of the degraded machining fluid. That is, in the case of curve B, the organic acid ions that coexist with iron ions and form stable polynuclear complex salts in the deteriorated processing fluid, which are not removed in the case of curve A, are also removed. Deterioration is accelerated. Furthermore, in the case of a mixed bed type ion exchange resin, the amount of anion exchange resin is reduced by the amount of the cation exchange resin added, which also shortens the life of the resin.

From the above explanation, in the life measurement of the ion exchanger using the electrical discharge machining apparatus using the organic compound solution of Example 8 as the machining fluid, anion exchangers (6) shown in FIG. The lifespan when filled with exchange resin (411) is as follows in Experiment 1 (71?) related to the conventional method.
The lifespan is approximately 2.1 times longer than that when Tg is filled, and the same results as described in Example 2 can be obtained even in the operating state of the actual machine.

In addition, in the above explanation, an electric discharge machining device using an organic compound solution R as a machining fluid is shown. However, the present invention is not limited to this, and an electric discharge machining device using an organic compound emulsion as a machining fluid is described. There may be.

[Effects of the Invention] As described above, the present invention (according to which the ion exchanger constituting the resistivity maintenance device is filled with an anion exchange resin alone)
1. In this way, only the anions that significantly reduce the resistivity are removed, and the stable polynuclear complex salts that are almost related to the lower resistivity are removed. 1. In addition, long-life ion exchange This has the remarkable effect of reducing rerunning costs by obtaining a container. 4. Simple explanation of inner surface zeroing Figure 1 is an explanatory diagram showing an embodiment of the present invention, and Figure 2 is a column method. FIG. 8 is an explanatory diagram showing an example of a conventional machining fluid supply device for an electric discharge machining apparatus.

In the figure, (1) is a resistivity maintenance device, (a) is a resistivity sensor, (to) is a resistivity control device, (to) is a pump 8,
(6) is an ion exchanger, (4117 is an anion exchange resin - In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In electrical discharge machining equipment that uses an organic compound solution as the machining fluid,
An electric discharge machining device characterized in that an ion exchanger constituting a resistivity maintenance device is solely filled with an anion exchange resin.