JPH05239700A - Electrolytic working device - Google Patents

Abstract

PURPOSE:To provide an electrolytic working device where electrolyte is indirectly and effectively cooled without directly injecting cooling liquid nitrogen, dry ice, etc., into the electrolyte. CONSTITUTION:An electrolyzer 12 storing electrolyte 11 in which material to be worked 13 is immersed, a DC power source 14 for applying voltage between the electrolyzer 12 and the material to be worked 13, a refrigerant tank 18 which encloses the electrolyzer 12 and stores a refrigerant 17 for cooling the electrolyte 11 and a radiating means 19 installed in a periphery wall of the electrolyzer 12 in contact with the refrigerant 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic processing apparatus capable of indirectly and efficiently cooling an electrolytic solution in which a workpiece is immersed.

[0002]

2. Description of the Related Art In an electrolytic processing apparatus, a workpiece and an electrode are immersed in an electrolytic solution, and a voltage is applied between the workpiece and the electrode, so that a portion of the workpiece touching the electrolytic solution is touched. Is electrochemically removed. As shown in FIG. 3 showing the concept of such a conventional electrolytic processing apparatus, the electrolytic bath 2 for storing the electrolytic solution 1 is immersed in the electrolytic solution 1. As described above, a test piece 3 which is a workpiece is charged, and the positive side of the potentiostat 4 which is a DC power source is connected to the test piece 3, while the negative side of the potentiostat 4 is connected to the electrolytic cell 2. A voltage is applied between the test piece 3 and the electrolytic cell 2.

As a result, the portion of the test piece 3 that has come into contact with the electrolytic solution 1 is ionized and dissolved into the electrolytic solution 1, and the portion of the test piece 3 that has come into contact with the electrolytic solution 1 is gradually removed. ing.

In order to make the processing of the test piece 3 uniform, a stirrer 5 for stirring the electrolytic solution 1 is provided at the bottom of the electrolytic bath 2, and the upper end of the test piece 3 is a work rotating device 6. The test piece 3 is driven and rotated in the electrolytic solution 1 which is suspended via the electrolyte solution 1 in a stirring state. or,
When the current from the potentiostat 4 flows through the test piece 3 and the electrolytic cell 2, Joule heat is generated and the electrolytic solution 1
However, some of the electrolyte solution 1 such as perchloric acid is chemically dangerous unless the temperature rise is suppressed. Therefore, the refrigerant 7 for cooling the electrolyte solution 1 is stored. The electrolytic cell 2 is fixed in the refrigerant container 8, and the electrolytic cell 2 is surrounded by a refrigerant 7 such as water.

Here, when the cooling by the coolant 7 such as water cannot catch up with the temperature rise of the electrolytic solution, the electrolytic solution 1 is directly cooled by injecting liquid nitrogen, dry ice or the like into the electrolytic solution 1. Things are also being done.

[0006]

[Problems to be Solved by the Invention] When electrolytically processing austenitic corrosion resistant heat-resistant alloys such as stainless steel represented by SUS304 and nickel-based alloys, a mixed solution of perchloric acid and acetic acid is often used as an electrolytic solution. .. In this case, since the cooling by the coolant 7 such as water cannot catch up with the temperature rise of the electrolytic solution, the electrolytic solution 1 is directly cooled by injecting liquid nitrogen or dry ice into the electrolytic solution 1. As a result, the acetic acid in the electrolytic solution 1 having a low melting point is frozen and solidified, the concentration of acetic acid in the electrolytic solution 1 changes, and the current density flowing through the corrosion-resistant heat-resistant alloy that is the workpiece also changes. There is a risk of unevenness.

As described above, when performing electrolytic processing using an electrolytic solution containing a plurality of solutes having different physical properties, it is necessary to inject cooling liquid nitrogen or dry ice into the electrolytic solution.
Something is more likely to occur and it is desirable to consider other cooling measures.

[0008]

An object of the present invention is to provide an electrolytic processing apparatus capable of indirectly and efficiently cooling an electrolytic solution without directly injecting liquid nitrogen or dry ice for cooling into the electrolytic solution. To do.

[0009]

An electrolytic processing apparatus according to the present invention comprises an electrolytic bath for storing an electrolytic solution in which a workpiece is immersed,
A direct current power source for applying a voltage between the electrolytic cell and the workpiece, a refrigerant container that surrounds the electrolytic cell and stores a refrigerant for cooling the electrolytic solution, and the electrolysis that contacts the refrigerant And a heat dissipation means provided on the outer peripheral wall of the tank.

Here, as the heat radiating means, a plurality of heat radiating fins projecting from the outer peripheral wall of the electrolytic cell into the coolant, and a cooling pipe arranged along the outer peripheral wall of the electrolytic cell and having a cooling liquid flowed therein Can be adopted.

[0011]

When a voltage is applied between the electrolytic bath and the work piece by the DC power supply, a current flows between the electrolytic bath and the work piece through the electrolytic solution, and the surface of the work piece becomes electrolytic solution. Is gradually melted, and electrolytic processing proceeds.

Along with this, Joule heat is generated in the electrolytic cell, but heat is efficiently exchanged between the electrolytic cell and the refrigerant by the heat radiation means provided on the outer peripheral wall of the electrolytic cell. The temperature rise of the electrolytic solution is suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, which shows the concept of one embodiment of the electrolytic processing apparatus according to the present invention, an electrolytic cell 1 which stores an electrolytic solution 11 and is made of a material having good corrosion resistance and conductivity.
A test piece 13 which is a workpiece is inserted into 2 so as to be immersed in the electrolytic solution 11. The anode side of a potentiostat 14 which is a DC power source is connected to the test piece 13, while the electrolytic cell 12 is connected to the electrolytic cell 12. The cathode side of the potentiostat 14 is connected, and a voltage is applied between the test piece 13 and the electrolytic cell 12.

As a result, the portion of the test piece 13 that has come into contact with the electrolytic solution 11 is ionized and dissolved into the electrolytic solution 11, and the portion of the test piece 13 that has come into contact with the electrolytic solution 11 is gradually removed. ing.

In order to make the working of the test piece 13 uniform, a stirrer 15 for stirring the electrolytic solution 11 is provided at the bottom of the electrolytic cell 12 in this embodiment, and the upper end of the test piece 13 is The test piece 13 is driven and rotated in the electrolytic solution 11 that is suspended and agitated via the work rotating device 16.

The electrolytic cell 12 is fixed in a refrigerant container 18 made of an electrically insulated material in which a refrigerant 17 for cooling the electrolytic solution 11 is stored together with the electrolytic cell 12, and the electrolytic cell 12 is fixed. The periphery of 12 is surrounded by a coolant 17 such as water. Further, a plurality of heat radiation fins 19 projecting into the refrigerant 17 are integrally formed on the outer peripheral wall of the electrolytic cell 12 as the heat radiation means of the present invention, so that the contact area between the refrigerant 17 and the electrolytic cell 12 can be expanded. I have to.

The Joule heat is generated in the test piece 13 and the electrolytic cell 12 by the electric current flowing from the potentiostat 14, but the electrolytic cell is inserted through the radiation fins 19 projecting from the outer peripheral wall of the electrolytic cell 12. Heat is efficiently exchanged between the refrigerant 12 and the refrigerant 17. As a result, the heat of the electrolytic solution 11 is also transferred to the refrigerant 17 side through the electrolytic bath 12, and the refrigerant 17
The cooling abilities of the electrolytic solution 11 and the electrolytic cell 12 are greatly improved as compared with the conventional ones.

The shapes of the electrolytic cell 12, the cooling container 18 and the like can be appropriately changed depending on the test piece 13 and the like.
Circulating supply of 7 is also effective.

In the above-described embodiments, the heat radiation fins 19 projecting from the outer peripheral wall of the electrolytic cell 12 are used as the heat radiation means of the present invention. It is also possible to adopt.

As shown in FIG. 2, which shows the concept of another embodiment of the electrolytic processing apparatus according to the present invention, as shown in FIG.
A cooling pipe 20 having an upstream side connected to a cooling liquid supply means (not shown) is spirally wound around the outer peripheral surface of the cooling pipe 20. The cooling pipe 20 is integrally joined to the electrolytic cell 12 via a brazing filler metal 21. An upstream side and a downstream side of the cooling pipe 20 are drawn out of the refrigerant container 18, and an upstream end of the cooling pipe 20 is connected to a cooling liquid supply source (not shown) for feeding a cooling liquid 22 such as water into the cooling pipe 20. is doing.

Therefore, the cooling liquid 22 flowing in the cooling pipe 20
And the refrigerant 17 cool the outer peripheral wall of the electrolytic cell 12,
Further, as a result that the refrigerant 17 itself is also cooled by the cooling liquid 22 flowing in the cooling pipe 20, the heat of the electrolytic solution 11 and the electrolytic cell 12 side is efficiently transferred to the refrigerant 17 and the cooling liquid 22 side, and the electrolytic solution 11 and the electrolytic cell 12 The cooling capacity of 12 is greatly improved over the conventional one.

In FIG. 2, members having the same functions as those of the embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

[0023]

According to the electrolytic processing apparatus of the present invention, since the heat dissipation means is provided on the outer peripheral wall of the electrolytic cell, the heat exchange efficiency between the electrolytic cell and the refrigerant surrounding the electrolytic cell is increased, and the electrolytic cell is improved. Also, the cooling effect of the electrolytic solution can be significantly enhanced as compared with the conventional one.

Further, since the electrolytic solution is indirectly cooled, the cooling of the electrolytic solution becomes uniform and it is possible to prevent uneven electrolysis on the machined surface of the workpiece.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic structure of an embodiment of an electrolytic processing apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing a schematic structure of another embodiment of the electrolytic processing apparatus according to the present invention.

FIG. 3 is a conceptual diagram showing an example of a conventional electrolytic processing apparatus.

[Explanation of symbols]

11 is an electrolytic solution, 12 is an electrolytic cell, 13 is a test piece, 14 is a potentiostat, 15 is a stirrer, 16 is a work rotating device, 17 is a refrigerant, 18 is a refrigerant container, 19 is a heat radiation fin, 20 is a cooling pipe, Reference numeral 21 is a brazing material, and 22 is a cooling liquid.

Claims (3)

[Claims] 1. An electrolytic bath for storing an electrolytic solution in which a workpiece is immersed, a DC power source for applying a voltage between the electrolytic bath and the workpiece, and the electrolytic solution surrounding the electrolytic bath. An electrolytic processing apparatus comprising: a refrigerant container in which a refrigerant for cooling the refrigerant is stored; 2. The electrolytic processing apparatus according to claim 1, wherein the heat radiating means is a plurality of heat radiating fins protruding from the outer peripheral wall of the electrolytic cell into the coolant. 3. The electrolytic processing apparatus according to claim 2, wherein the heat radiating means is a cooling pipe which is arranged along the outer peripheral wall of the electrolytic cell and through which a cooling liquid flows.