JPH05285830A - Electrolytic dressing electrode structure for metal bond grinding wheel - Google Patents

Abstract

PURPOSE:To perform high-efficient electrolytic dressing by a method wherein a weak conductive liquid delivery hole is formed in the surface, positioned facing a grinding wheel, of an electrode for electrolytic dressing, and a gap between a metal bond grinding wheel and the electrode is sufficiently filled with weak conductive liquid in any rotation area. CONSTITUTION:A weak conductive liquid delivery hole is formed in the surface, positioned facing the working end surface shape of a metal bond grinding wheel, of an electrode 1. A gap between a metal bond grinding wheel 6 and the electrode 1 is filled with weak conductive liquid 7 and a diffusion preventing plate 5 is arranged on a side on the electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic dressing electrode structure for a metal bond grindstone in a grinding process.

[0002]

2. Description of the Related Art In recent years, a metal bond fine abrasive grain grindstone has been used for the purpose of ultra-precision machining in a grinding process as a removal process. For example, as disclosed in Japanese Patent Application Laid-Open No. 2-232162, a metal bond grindstone is used. By applying a voltage and dressing, a good mirror-smooth surface can be obtained efficiently and at high speed.

[0003]

However, when a weakly conductive liquid is supplied from the outside of the electrode between the metal bond grindstone and the electrode as shown in FIG. 6, the centrifugal force of the metal bond grindstone scatters the weakly conductive liquid. Since the metal bond grindstone and the electrode are not filled with each other, the dressing effect by electrolysis is lowered, which is very time-consuming and inconvenient.

When the end surface of the grindstone used has a shape other than the JIS-A type, the centrifugal force generated by the rotation of the metal-bonded grindstone causes a draining effect, which causes the weakly conductive liquid to concentrate on the tip of the grindstone or diffuse to the side surface. The electrolytic dressing effect is less likely to occur. An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a device in which a weakly conductive liquid is filled between a metal bond grindstone and an electrode in any rotation range.

[0005]

In the method and apparatus for electrolytically dressing a metal bond grindstone according to the present invention, a discharge hole for a weakly conductive liquid is provided on the surface of the electrode side opposite to the end face shape of the metal bond grindstone, and a metal bond is formed. The structure is characterized in that a weakly conductive liquid is filled between the grindstone and the electrode, and a diffusion prevention plate is attached to the side surface on the electrode side to prevent the weakly conductive liquid from diffusing from the side surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrolytic dressing method for a metal bond grindstone according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an electrode for electrolysis according to the present invention. 1
Is an electrode, 2 is a weakly conductive liquid passage, and 3 is a weakly conductive liquid discharge hole, which is provided at three places in this embodiment. Reference numeral 4 is an electrolytically acting surface facing the metal bond grindstone. Weakly conductive liquid discharge hole 2
The position was set at the center of the electrode so that the weakly conductive liquid could flow sufficiently even if the rotation direction of the grindstone changed. It is important to determine the number and hole diameter of the weakly conductive liquid discharge holes 2 depending on the size of the electrode 1. As a matter of course, the weakly conductive liquid discharge hole 2 is not limited to have a circular diameter, and includes a shape in which the weakly conductive liquid is sufficiently spread over the electric field acting surface 4. FIG. 2 shows an electrode structure for electrolysis according to the present invention. Reference numeral 5 is a diffusion prevention plate, which was attached at a right angle to the electrolysis surface of the electrode 1. As shown in FIG. 3, the weakly conductive liquid discharged from the weakly conductive liquid discharge hole 3 easily escapes to the side surface of the electrode. By attaching the diffusion prevention plate 5, it is possible to prevent diffusion to the side surface. The process of electrolytic dressing will be described below.

As shown in FIG. 3, the electrode 1 is a metal bond grindstone 6
And the distance to obtain the optimum electrolysis effect (0.01 mm to 1
0 mm), the weakly conductive liquid 7 is supplied between the electrode 1 and the metal bond grindstone 6 through the weakly conductive liquid passage 2. By applying a voltage to the electrode 1 and the metal bond grindstone 6 from the electroconductive power source 8 through the weakly conductive liquid 7, the metal bond grindstone 6 can be dressed by the electrolytic effect, and a good mirror surface can be obtained.

FIG. 4 shows changes in current flowing between the metal bond grindstone and the electrode with respect to time according to peripheral speed.
If the peripheral speed becomes faster, the weakly conductive liquid 7 will not be sufficiently spread, and the electrolytic effect will decrease. It becomes difficult to form a non-conductive film on the surface of the metal bond grindstone, and the current value does not decrease. The peripheral speed is low when dressing a metal bond grindstone, but the peripheral speed is 1 when actually grinding a workpiece.
Higher than 000 m / min. It shows that electrolytic dressing is less likely to occur during processing.

FIG. 5 shows a peripheral speed of 1200 m / min in FIG.
Data and the peripheral speed when using the electrode according to the present invention 1
It shows the change over time of the current flowing between the metal bond grindstone of 200 m / min and the electrode. It shows that electrolytic dressing can be sufficiently performed even during the grinding process.

[0011]

As described above, according to the present invention, by providing a weakly conductive liquid discharge hole and a diffusion preventive plate on the electrode working surface, the weakly conductive liquid is filled and ground between the metal bond grindstone and the electrode in any rotation range. It has an effect that electrolytic dressing can be effectively performed even in the inside.

[Brief description of drawings]

FIG. 1 is an electrode diagram for electrolysis according to the present invention.

FIG. 2 is an electrode structure diagram to which a diffusion prevention plate according to the present invention is attached.

FIG. 3 is a conceptual diagram of electrolytic dressing of a metal bond grindstone according to the present invention.

FIG. 4 is a characteristic diagram of electrolytic dressing current showing a change in current flowing between a metal bond grindstone and an electrode according to a conventional technique for each peripheral speed.

FIG. 5 is a comparison diagram of the conventional technique of the electrolytic dressing current characteristic and the present invention, which shows the change over time of the current flowing between the metal bond grindstone and the electrode.

FIG. 6 is a diagram showing a method of supplying a weakly conductive liquid according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode 2 Weakly conductive liquid passage 3 Weakly conductive liquid discharge hole 4 Electrolytic action surface facing metal bond grindstone 5 Diffusion prevention plate 6 Metal bond grindstone 7 Weakly conductive liquid 8 Power supply for electrolysis

Claims (2)

[Claims] 1. In a machine tool using a metal bond grindstone, an electrolytic dressing device provided in the machine tool is provided with a discharge hole for a weakly conductive liquid for electrolysis provided on an electrode surface facing a grindstone working surface. Electrode dressing electrode structure of metal bond grindstone. 2. An electrolytic dressing electrode structure for a metal bond grindstone, characterized in that a diffusion prevention plate for spreading the weakly conductive liquid for electrolysis to the side surface is provided on the side surface of the electrode according to claim 1.