JPH08188900A - Dipping electrolytic deburring method regarding iron - Google Patents

Abstract

PURPOSE: To deburr a work without especially considering the interval between it and a cathode by anodizing the iron work in an electrolyte contg. halogen compd., ethylene glycol and urea while oscillating the work. CONSTITUTION: An iron work 3 having a burr due to shearing and a cathode 4 are dipped in an electrolyte 2 contg. at least one kind of halogen compd. among KCl, NaCl, KBr, NaBr, KI, NaI, KF and NaF, ethylene glycol or glycerin and urea or EDTA. Anodization is then conducted by impressing a voltage by a DC power source 5 while oscillating the work 3. Consequently, only the sharp angular burr is removed from an ionized boundary layer, and the part is selectively anodized to effectively remove the burr.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion electrolytic deburring method for iron which is capable of deburring by anodic electrolysis without particularly considering the distance between a cathode work and a cathode. .

[0002]

2. Description of the Related Art In the conventional electrolytic deburring method, a work as an anode and a cathode are fixed at a close distance, a direct current is supplied while an electrolytic solution such as a sodium nitrate solution is flown in the gap, and the work surface is subjected to anodic electrolysis. To remove the burr. However, this method requires a cathode corresponding to the shape of the work, and there is a problem that setting of the work is not easy.

Therefore, there has been proposed an immersion electrolytic deburring method capable of performing deburring by anodic electrolysis without particularly considering the distance between the work as an anode and the cathode.
As disclosed in U.S. Pat.No. 4411751, this method is a method in which a workpiece is immersed in an electrolyte solution containing ammonium nitrate, ammonium chloride, ammonium sulfamate, and ethylene glycol, and a current is applied. is there.

This method utilizes an ionized interface layer formed on the surface of the work by anodic electrolysis.
That is, the ionized interface layer plays a role of controlling the dissolution of the work by anodic electrolysis, but the rocking of the work causes the ionized interface layer to start to dissolve.
The degree of melting is larger at a sharper corner, and therefore the electric field is concentrated on the sharper corner, and the burr of the work can be selectively removed based on the principle.

According to the method disclosed in this US Pat. No. 4411751, deburring by anodic electrolysis can be performed without particularly considering the distance between the work and the cathode.
However, this method has some effect when the work is stainless steel or aluminum, but when the work is iron, only a small amount of the ionized interface layer is formed, so a sufficient deburring effect can be obtained. Was difficult.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the related art and makes it possible to deburr iron by immersion electrolysis without special consideration of the distance between the work and the cathode. This is done to provide an electrolytic deburring method.

[0007]

The present invention made to solve the above-mentioned problems includes potassium chloride, sodium chloride, potassium bromide, sodium bromide, potassium iodide,
A cathode and an iron-containing material in an electrolytic solution containing one or more halogen compounds selected from the group consisting of sodium iodide, potassium fluoride, and sodium fluoride, ethylene glycol or glycerin, and urea or ethylenediaminetetraacetic acid, respectively. The work is immersed in the work, and the work is rocked to carry out anodic electrolysis.

[0008]

According to the present invention, potassium chloride, sodium chloride, potassium bromide, sodium bromide, and
Potassium iodide, sodium iodide, potassium fluoride,
Since at least one halogen compound selected from the group consisting of sodium fluoride is used, insoluble products that passivate on the surface of the iron work are not generated, and the electrolytic reaction product acts as the cathode. It does not adhere. Further, since urea or ethylenediaminetetraacetic acid is contained in the electrolytic solution, the electrolytic reaction product forms a viscous iron complex ion (ionized interface layer) on the surface of the work, and further ethylene glycol or glycerin causes this electrolytic reaction. Prevent dissipation of the product.

Therefore, according to the present invention, the ionized interface layer can be formed on the surface of the iron work, and the ionized interface layer is melted at a sharp corner portion such as a burr by rocking the work. That part can be selectively subjected to anodic electrolysis for deburring. Therefore, according to the present invention, deburring of a work made of iron, which has been impossible in the past, can be performed without further considering the distance between the work and the cathode.

[0010]

EXAMPLES The present invention will be described in more detail below with reference to examples. FIG. 1 is a cross-sectional view showing an outline of a test apparatus of the present invention, 1 is an electrolytic cell, 2 is an electrolytic solution, 3 is an iron work (test piece) having a burr by shearing, 4 is a cathode, 5 is a DC power source. Is. The material of the work 3 in the example is SS41 (rolled steel for general structure, P: 0.05% or less, S: 0.05% or less, balance Fe), and its size is 10 × 10 mm. The work 3 is finely swung in the electrolytic solution 2 by a mechanical means (not shown). The cathode 4 is made of SUS304 and its dimensions are 50 x 50 mm.
Therefore, they are installed parallel to the work 3 at intervals of about 90 mm. The electrolysis voltage supplied from the DC power supply 5 is DC 10
V.

First, as a preliminary experiment, chemicals capable of anodic electrolysis of iron were confirmed. As a result, potassium chloride,
When at least one of sodium chloride, potassium bromide, sodium bromide, potassium iodide, sodium iodide, potassium fluoride and sodium fluoride was used as an electrolytic component, the surface of the work 3 was subjected to anodic electrolysis. . The current density is
35 to 120 A / dm ² . On the other hand, when sodium acetate, sodium nitrate, sodium sulfate, sodium carbonate, trisodium phosphate, etc. are used as electrolytic components,
The surface of the work 3 was not electrolyzed. Next, the test was conducted by changing the composition of the electrolytic solution 2 variously. The results are as follows.

(Example 1) An electrolytic solution containing 100 g / L of potassium chloride, 400 cc / L of ethylene glycol, and 50 g / L of urea was placed in the electrolytic cell 1 of the above-mentioned test apparatus, and the current density was 40 to 50 A / dm.
^The work 3 was subjected to immersion electrolytic deburring by energizing at ² for 90 seconds. As a result, the surface of the work 3 was covered with a thick yellow viscous layer and became smooth. Further, burrs due to shearing of the work 3 were rounded, and an excellent deburring effect was recognized.

(Example 2) 100 g / L potassium chloride, 400 cc / L ethylene glycol, 50 g / L ethylenediaminetetraacetic acid
An electrolytic solution containing is placed in the electrolytic cell 1 of the above-mentioned test device,
Energize for 90 seconds at a current density of 40 to 50 A / dm ² and work 3
Immersion electrolytic deburring was performed. As a result, the surface of the work 3 was covered with an orange layer having a low viscosity and became smooth.
Further, the burrs of the work 3 were rounded, and an excellent deburring effect was recognized.

(Example 3) An electrolytic solution containing 100 g / L of potassium chloride, 400 cc / L of glycerin, and 50 g / L of urea was put in the electrolytic cell 1 of the above-mentioned test apparatus, and the current density was 90 at 27 to 38 A / dm ² . The workpiece 3 was energized for immersion electrolytic deburring of the work 3. As a result, the surface of the work 3 was covered with the yellow viscous layer and became smooth. Further, burrs due to shearing of the work 3 were rounded, and an excellent deburring effect was recognized.

(Example 4) An electrolytic solution containing 100 g / L of potassium chloride, 400 cc / L of glycerin, and 50 g / L of ethylenediaminetetraacetic acid was placed in the electrolytic cell 1 of the above-mentioned test apparatus to obtain a current density.
The work 3 was subjected to immersion electrolytic deburring by applying electricity for 90 seconds at 27 to 38 A / dm ² . As a result, the surface of the work 3 was covered with the orange viscous layer and became smooth. Further, the burrs of the work 3 were rounded, and an excellent deburring effect was recognized.

(Embodiment 5) An electrolytic solution containing 100 g / L of potassium bromide, 400 cc / L of ethylene glycol and 50 g / L of urea was placed in the electrolytic cell 1 of the above-mentioned test apparatus and the current density was 35 to 37 A / dm.
^The work 3 was subjected to immersion electrolytic deburring by energizing at ² for 90 seconds. As a result, the periphery of the surface of the work 3 was covered with an orange layer having a low viscosity. Further, burrs due to shearing of the work 3 were rounded, and an excellent deburring effect was recognized.

Example 6 Potassium bromide 100 g / L, ethylene glycol 400 cc / L, ethylenediaminetetraacetic acid 50 g / L
An electrolytic solution containing is placed in the electrolytic cell 1 of the above-mentioned test device,
Energize for 90 seconds at a current density of 35 to 37 A / dm ² and work 3
Immersion electrolytic deburring was performed. As a result, the surface of the work 3 was covered with a thick viscous layer having an orange color toward the periphery. Further, the burrs of the work 3 were rounded, and an excellent deburring effect was recognized.

(Example 7) An electrolytic solution containing 100 g / L of potassium bromide, 400 cc / L of glycerin and 50 g / L of urea was placed in the electrolytic cell 1 of the above-mentioned test apparatus and the current density was 23 to 26 A / dm ² . Power was applied for 90 seconds, and the workpiece 3 was subjected to immersion electrolytic deburring. As a result, the periphery of the surface of the work 3 was covered with an orange layer having low viscosity. Also, the burr of the work 3 is rounded,
An excellent deburring effect was recognized.

(Example 8) An electrolytic solution containing 100 g / L of potassium bromide, 400 cc / L of glycerin, and 50 g / L of ethylenediaminetetraacetic acid was placed in the electrolytic cell 1 of the above-mentioned test apparatus, and the current density was changed.
The workpiece 3 was subjected to immersion electrolytic deburring by energizing at 23 to 26 A / dm ² for 90 seconds. As a result, the surface of the work 3 was covered with a thick viscous layer having an orange color toward the periphery. Work 3 again
The burr was rounded and an excellent deburring effect was recognized.

(Comparative Example 1) A test was conducted using an electrolytic solution in which potassium chloride in Example 1 was replaced with sodium nitrate, and the other conditions were the same as those in Example 1, and the surface of the work 3 was almost electrolyzed. No deburring effect was observed.

(Comparative Example 2) A test was conducted using an electrolytic solution in which urea of Example 1 was replaced with trisodium phosphate and other conditions were the same as those of Example 1, and the surface of the work 3 was bluish green. Covered with layers. However, the burr was slightly rounded and the deburring effect was insufficient.

(Comparative Example 3) A test was conducted using an electrolytic solution in which the urea of Example 1 was replaced with sodium tripolyphosphate and the other conditions were the same as those of Example 1.
The surface of was covered with a viscous yellow layer and a white layer. However, no deburring effect was observed.

[0023]

As described above, according to the immersion electrolytic deburring method of the present invention, it is possible to deburr an iron workpiece without further considering the distance from the cathode. For this reason, there is an advantage that a cathode corresponding to the shape of the work is not required unlike the conventional case and the work can be easily set. Moreover, the electrolytic solution of the present invention does not contain toxic substances,
It also has the effect of suppressing the generation of rust on the work after deburring. Therefore, the present invention greatly contributes to the industry as an immersion electrolytic deburring method for iron which solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of a test apparatus used in Examples and Comparative Examples.

[Explanation of symbols]

 1 Electrolyzer 2 Electrolyte 3 Iron work 4 Cathode 5 DC power supply

Claims (1)

[Claims] 1. A halogen compound selected from the group consisting of potassium chloride, sodium chloride, potassium bromide, sodium bromide, sodium bromide, potassium iodide, sodium iodide, potassium fluoride and sodium fluoride, and ethylene. In an electrolytic solution containing glycol or glycerin and urea or ethylenediaminetetraacetic acid, respectively,
An immersion electrolytic deburring method for iron, which comprises immersing a cathode and a work made of iron, and performing anodic electrolysis while rocking the work.