JPH11226821A - Surface treatment method due to discharge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate slackening of an edge of a material to be treated and apply a surface treatment on an edge part securely by providing an auxiliary material on a side face of an edge of the edge part of the material to be treated for surface treatment. SOLUTION: An auxiliary material 2 made of a metallic material is provided on a face of an edge part on which a surface treatment is applied, and a voltage is applied between an electrode 3 made of a material which becomes a surface treatment material and a die 1 and the auxiliary material 2 to cause discharge so that a surface treatment film 4 is formed on the die 1 and the auxiliary material 2. After that, the auxiliary material 2 is removed so that the surface treatment film 4 is securely coated on the edge part on which the surface treatment is applied. Consequently, the electrode 3 is consumed uniformly, and discharge is not concentrated in the edge part, thereby causing no slackening of the edge part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of producing a metal surface by generating a discharge between an electrode made of a surface treatment material or a material which is a base material of the surface treatment material and a conductive material such as a metal to be treated. And a surface treatment method for forming a surface treatment film (modified layer).

[0002]

2. Description of the Related Art A technique for imparting corrosion resistance and abrasion resistance by coating the surface of a metal material or the like by means of submerged discharge has already been applied for a patent in Japanese Patent Application Laid-Open No. 7-70761 and has been known. The outline of the technology is as follows. An electrode material is deposited on a work by performing submerged discharge with an electrode obtained by mixing and compressing WC and Co powders. Thereafter, remelting discharge machining is performed with another electrode (for example, a copper electrode or a graphite electrode) to obtain higher hardness and higher adhesion.

The prior art will be described below with reference to FIGS. In FIG. 5, a workpiece (base material S50C) 1 is subjected to electric discharge machining in a liquid using a mixed green compact electrode (first electrode) 30 of WC-Co (tungsten carbide-cobalt) to perform surface treatment. The film 40 is deposited on the workpiece 1 (primary processing). Next, re-melting processing (secondary processing) is performed using the second electrode 31 that does not wear much, such as a copper electrode. With the primary processing as deposited, the structure had a hardness of about Hv = 1410 and many cavities.
The cavities of the surface treatment film 41 are eliminated by the re-melting processing of the next processing, and the hardness is improved to Hv = 1750. FIG. 6 is a configuration diagram showing a conventional surface treatment apparatus using electric discharge, and shows a state of machining a cutting blade portion of a press die. In the figure,
3 is an electrode, 4 is a surface treatment film (modified layer), 100 is a surface treatment device, 101 is a processing tank, 102 is a control device, 103 is a power supply, and the surface treatment film 4 is a material (die) 1 for processing. It is formed at the edge.

[0004]

FIG. 7 is an enlarged view of a portion to be processed 1, an electrode 3, and a formed surface treatment film 4 in the surface treatment apparatus shown in FIG. FIG. 8 shows a cross section taken along line CC of FIG. In the case of processing on the edge end face such as the cutting edge processing, if the electrode end is set to be slightly near the end face as shown in FIG. 8A, the surface treatment is firmly applied to the corner to be processed due to the frequency of discharge. There was a problem that it was not done. Further, when the electrode protrudes greatly as shown in FIG. 8B, only one side of the electrode is consumed, so that the shape of the edge is impaired due to the concentration of electric discharge at the tip of the edge as the processing proceeds. was there. Also,
When a punch and a die are formed, since the surface treatment is performed separately, there is a problem that the processing takes a very long time.

[0005] The present invention has been made to solve the above problems, and eliminates the edge dripping of the material to be processed.
It is another object of the present invention to provide a surface treatment method capable of reliably performing a surface treatment on an edge portion.

[0006]

According to a first aspect of the present invention, there is provided a surface treatment method using electric discharge, in which a voltage is applied between an electrode made of a surface treatment material or a material which is a source of the surface treatment material and a material to be treated. When a surface treatment film is formed on the surface of the edge portion of the material to be treated by generating electric discharge, an auxiliary material is provided on the side surface of the edge of the edge portion to perform the surface treatment.

In the surface treatment method by electric discharge according to the second method of the present invention, the material to be processed and the auxiliary material are a punch and a die for a press die, and the punch cutting blade portion and the die cutting blade portion are matched. The surface treatment is performed simultaneously on the punch cutting edge and the die cutting blade with the punch inserted into the die.

In the surface treatment method using electric discharge according to the third method of the present invention, a discharge is generated by applying a voltage between an electrode made of a surface treatment material or a material which is a source of the surface treatment material and a material to be treated. Thus, when a surface treatment film is formed on the surface of the edge portion of the material to be treated, the side surface of the edge of the edge portion is coated with an insulating adhesive or paint to perform the surface treatment.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2 by taking as an example the case of surface treatment of a die cutting edge portion of a press die. FIG.
An auxiliary material 2 made of the same kind of metal material as the material to be treated 1 is installed on the side of the cutting blade of the die which is the material to be treated 1 to perform surface treatment. FIG. 2A shows a state of the surface treatment in the present embodiment. An auxiliary material 2 made of a metal material is installed on the side surface of the edge portion to be subjected to the surface treatment, and a voltage is applied between the electrode 3 made of the material to be the surface treatment material, the die 1 and the auxiliary material 2 to generate a discharge, A surface treatment film 4 is formed on the die 1 and the auxiliary material 2. After that, as shown in FIG. 2B, if the auxiliary material 2 is removed, the edge portion to be subjected to the surface treatment is surely coated with the surface treatment film 4.
According to the present invention, since the electrode 3 is uniformly consumed and the discharge does not concentrate on the edge portion, there is an effect that nobody is generated on the edge portion.

Embodiment 2 3 (a) to 3 (c) show a second embodiment of the present invention. In the die 10, a punch 20 corresponding to the die 10 and a cutting edge portion A to be subjected to a surface treatment coincide with each other. It is installed in the opposite direction to perform surface treatment. According to the present embodiment, since the electrode 3 is uniformly consumed, no dripping occurs at the edge portion and the cutting edge of the die 10 and the punch 20 can be processed at the same time, so that the processing time is shortened. is there.

Embodiment 3 4 (a) and 4 (b) show that an insulating adhesive 5 and
Alternatively, a state in which a paint is applied and surface treatment is performed by electric discharge is shown. Examples of the material to be coated include polyvinyl chloride, rubber, paint, and the like. After the surface treatment by electric discharge, the insulating adhesive or paint is removed from the material to be treated 1 by a solvent. In the method according to the present embodiment, as shown in FIG. 4 (b), by applying an insulating material, there is no discharge to the side surface of the cutting blade. Discharge does not concentrate and no edge is lost. Further, since an adhesive or a paint having fluidity is used as an auxiliary material provided on the side surface of the edge portion to be subjected to the surface treatment, there is an effect that the edge portion having a complicated shape can be handled.

[0012]

As described above, according to the first method of the present invention, a voltage is applied between an electrode made of a surface treatment material or a material which is a source of the surface treatment material and a material to be treated, and discharge is performed. When the surface treatment film is formed on the surface of the edge portion of the material to be processed by generating the auxiliary material on the side surface of the edge of the edge portion, the surface treatment is performed. There is an effect that the surface treatment can be surely performed on the edge portion without any defect.

According to the second method of the present invention, the material to be processed and the auxiliary material are a punch and a die for a press die. With the punch inserted in the die, surface treatment is applied to the punch cutting edge and the die cutting blade at the same time, so that no edge occurs and the die and punch cutting blades can be processed at the same time. This has the effect of reducing the processing time.

According to the third method of the present invention, a discharge is generated by applying a voltage between an electrode made of a surface treatment material or a material which is a base material of the surface treatment material and a material to be treated. When forming a surface treatment film on the surface of the edge portion of the material to be treated, because the edge side surface of the edge portion was coated with an insulating adhesive or paint to perform the surface treatment,
There is an effect that it is possible to prevent the edge portion from dripping even for an edge portion having a complicated shape.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state of a surface treatment according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a surface treatment method according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating a surface treatment method according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a surface treatment method according to a third embodiment of the present invention.

FIG. 5 is an explanatory view for explaining a conventional surface treatment method using electric discharge.

FIG. 6 is a configuration diagram showing a conventional surface treatment apparatus using discharge.

FIG. 7 is a perspective view showing a state of a conventional surface treatment.

FIG. 8 is an explanatory diagram illustrating a problem caused by a conventional surface treatment method.

[Explanation of symbols]

1 Material to be processed, 2 Auxiliary material, 3 Electrodes, 4 Surface treatment film, 5 Insulating adhesive, 10 Die, 20 Punch, 3
0 first electrode, 31 second electrode, 40, 41 surface treatment film, 100 surface treatment device, 101 processing tank.

Claims (3)

[Claims] 1. A surface treatment is performed on an edge surface of a material to be treated by applying a voltage between an electrode made of the surface treatment material or a material which is a source of the surface treatment material and a material to be treated to generate a discharge. When forming a film, an auxiliary material is provided on an edge side surface of the edge portion to perform a surface treatment. 2. The material to be processed and the auxiliary material are a punch and a die for a press die, and the punch cutting blade is aligned with the die cutting blade, and the punch is inserted into the die. The surface treatment method according to claim 1, wherein the surface treatment is performed simultaneously on the die cutting edge. 3. A surface treatment is performed on the edge surface of the material to be treated by applying a voltage between the material to be treated and an electrode made of the surface treatment material or a material which is a source of the surface treatment material to generate a discharge. When forming a film, a surface treatment method by electric discharge, characterized in that an insulating adhesive or paint is applied to an edge side surface of the edge portion to perform a surface treatment.