JPH03239471A - Electrolytic dressing device - Google Patents

Abstract

PURPOSE:To keep a stable electrolytic dressing action and maintain a good state of sharpness in a grinding wheel as well as to realize stable working in a highly efficient manner at all times by supplying a conductive working fluid in space between a minus side electrode and a grinding wheel as making it into ultrasonic vibration, and installing such a means as removing an oxide being formed on the wheel surface. CONSTITUTION:An electrolytic action is produced in space between a negative electrode 6 and a graining wheel 1, while only a metal bond of the wheel 1 or an anode is selectively separated, thereby promoting the projection of an abrasive grain (a). Then, a nonconductor film (b) such as a metallic oxide or the like being formed on a surface of the wheel 1 during electrolysis is washed and removed clean by addition of ultrasonic vibration by means of an ultrasonic vibrator in an ultrasonic vibrating unit 7 and a working fluid 9 being sprayed out of a working fluid feed hole in the negative electrode 6, thus a stable dress ing action is continued all the time. Since such a fact that the wheel 1 is con sumed so unnecessarily by electrolysis of the metal bond must be avoided, an electric condition of a power source 4 for electrolytic use is controlled, through which sharpness in the wheel 1 is maintained in a good condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrolytic dressing device that applies an electrolytic action to a grindstone used for grinding to dress (sharpen) the grindstone.

(Prior Art) As the grinding process progresses, abrasive grains become clogged or clogged, leading to phenomena such as an increase in grinding resistance or seizure of the workpiece.

Therefore, a dressing operation is required to restore the sharpness of the abrasive grains.

Electrolytic dressing is a very effective dressing method for metal bond grindstones, and FIG. 2 shows a conventional example in which electrolytic dressing is applied to a polishing machine such as a lapping machine. In the figure, 11 is a rotatable grindstone having an abrasive grain layer 11b, 12 is a workpiece provided on the abrasive grain layer 11b side, and is provided on a rotatable sample plate 13. 14 is a power source for performing electrolytic dressing; 15 is a power supply brush on the anode side provided on the grinding wheel 1F side; 16 is a negative electrode disposed opposite to the abrasive layer 11b with a gap therebetween; 17 is processed into the abrasive layer 11b. This is a nozzle that supplies liquid.

(Problems to be Solved by the Invention) However, in the electrolytic dressing device of the above-mentioned fllIG, (1) Originally, it is desired to obtain a grindstone surface with abrasive grains a protruding from the surface as shown in FIG. 3(a). However, if electrolytic dressing is continued during machining, a nonconducting film such as metal oxide is formed on the surface of the grinding wheel on the anode side, as shown in 0)) in Figure 3, and the dressing action progresses. This results in a decrease in processing efficiency! There is IN.

(2) For this reason, as shown in Japanese Patent Application Laid-open No. 60-20859, as a method for removing the generated nonconductive film,
One possible method is to provide a separate grinding wheel such as WA, which has a low degree of bonding, and use this grinding wheel to mechanically remove the coating, but in this method, the abrasive grains a that fall off will cause suffragettes on the finished surface of the workpiece, resulting in poor surface quality. Some RNs say it will get worse.

The present invention has been proposed in view of the above circumstances, and its purpose is to provide an electrolytic dressing device that can always provide a stable electrolytic dressing action to the abrasive grain layer and maintain the sharpness of the abrasive grains. The goal is to provide

(Means for solving RH) In the present invention, in a device that processes a workpiece material while dressing a grinding wheel by applying an electrolytic action to a grinding wheel holding diamond or CBN abrasive grains by metal bond, a minus (@ The above object is achieved by providing a means for removing oxides generated on the surface of the grindstone by supplying a conductive working fluid between the pole and the grindstone while vibrating it ultrasonically.

(Function) With the structure described above, cutting quality is improved by applying ultrasonic vibrations to the machining fluid and removing the non-conducting film generated by the machining fluid to which the ultrasonic vibrations have been applied.

(Embodiment) FIG. 1 shows an embodiment of the present invention, which is applied to a surface polishing machine used for lapping and the like.

1 in the figure is a rotatable whetstone corresponding to a polishing disk, and a central axis 1a is provided on the bottom surface of the whetstone to rotate around the central axis 1a, and diamond or CBN abrasive grains are placed on the top surface of the whetstone. An abrasive grain layer 1b bonded by metal bond is provided. A sample plate 2 is provided with a work material holding mechanism above this abrasive grain layer 1b.
is provided, rotates, and pressurizes I! A workpiece 3 is attached to the lower surface of the sample plate 2 by a pressure device having a structure.
is pressed against the grindstone side to process the surface of the workpiece 3.

The electrolytic dressing device is provided separately from the part that processes the workpiece 3, and the anode of the power source 4 for electrolysis has the (+) side power supply brush 5 in contact with the grinding wheel base metal part, and the entire grinding wheel surface is used as the anode. . On the other hand, the negative electrode (-) faces the abrasive grain layer 1b, and a plate-shaped negative electrode 6 is installed at a constant interval.

Furthermore, an ultrasonic vibration unit 7 is fixed on the negative pole 6,
The coolant hose 8 is connected to the ultrasonic vibration unit 7, and after the machining fluid 9 passes through the coolant hose 8, ultrasonic vibration is applied by the ultrasonic vibrator in the ultrasonic vibration unit 7, and the processing liquid 9 is applied inside the negative electrode 6. The machining fluid is ejected from the supply hole,
It is configured so that the gap between it and the grindstone 1 is filled with machining fluid 9. Furthermore, the machining fluid is also flowed in this manner at the machining points of the workpiece 3 to enhance the cooling effect. With the electrodes etc. installed in this way, an electrolytic action is caused between the negative electrode 6 and the surface of the grinding wheel l using a separately provided electrolytic power source, and 1 lip is generated.
Selectively elute only the metal bond of grindstone 1 which is i,
The abrasive grains are designed to protrude. Then, a nonconducting film such as a metal oxide formed on the surface of the grinding wheel 1 during electrolysis is washed away by the machining liquid 9 to which ultrasonic vibrations are applied, and a stable electrolytic dressing effect is maintained at all times. In addition, because it is necessary to avoid unnecessary wear and tear on the grindstone due to metal bond electrolysis, the electrical conditions of the TL14 for electrolysis or the electrical conductivity of the machining fluid are appropriately controlled to ensure the sharpness of the grindstone 1. By ensuring that it is maintained in good condition, highly efficient and stable processing is achieved.

(Effects of the Invention) As described above, according to the present invention, diamond or C
In a device that processes a workpiece while dressing a grinding wheel by applying an electrolytic action to a grinding wheel holding BN abrasive grains by metal bond, a conductive machining fluid is ultrasonically vibrated between the negative electrode and the grinding wheel. The structure is equipped with a means to remove oxides generated on the surface of the whetstone by supplying the whetstone to the surface of the whetstone, which maintains a stable electrolytic dressing effect and keeps the whetstone sharp, resulting in a highly efficient and stable grinding process. processing can be realized.

(2) Since the generated nonconductor film is not removed using a separate grindstone, there is no need to worry about scratches or other damage to the workpiece due to fallen abrasive grains, and good machined surface quality can be obtained.

(3) No special techniques are required for dressing the grindstone, and the sharpness can be easily maintained.

■... Grinding wheel, 1a... Rotating shaft, lb... Abrasive grain layer,
2... Sample plate, 3... Work, 4... Power supply, 5... Power supply plan, 6... Negative electrode, 7... Ultrasonic vibration unit, 8... Coolant hose, 9 ...Processing fluid.

It has the following effects.

[Brief explanation of drawings]

FIG. 1 shows the electrolytic dressing operation in one embodiment of the present invention.
Figure 2 and Figure 2 are conventional examples in which electrolytic dressing is applied to a flat surface polishing machine, and Figure 3 is a schematic diagram of the surface condition of the grinding wheel. This indicates a state in which electrolytic action stops progressing. Figure 1 Procedural Amendment Form Flat Bottom June 19, 1990 1. Indication of the case 1990 Patent side No. 35513 2. Name of the invention Electrolytic dressing device 3. Person making the amendment Relationship to the case Name of the patent applicant (583 ) Matsushita Electric Works Co., Ltd. 4, Agent Address: 704 Sasazuka, 2-4-1 Sasazuka, Shibuya-ku, Tokyo No. 3, Figure 6 Contents of amendment (1) Lines 8 to 8 on page 2 of the specification Toward the 9th line, “
12 is a workpiece provided on the abrasive grain layer 11b side;
2 (a workpiece existing on the abrasive grain layer 11b). (2) In the same page of the same book, line 11, "15 is provided on the grindstone 11 side" is corrected as "15 is in contact with the top of the grindstone 11. (3) In the same book, page 4, lines 9 to 10, "improves sharpness. -:" is corrected to "improves electrolytic dressing and grindability." do.

Claims (1)

[Scope of Claims] In a device that processes a workpiece material while dressing a grindstone by applying an electrolytic action to a grindstone holding diamond or CBN abrasive grains by a metal bond, there is provided a device in which electrical conductivity is established between a negative electrode and the grindstone. 1. An electrolytic dressing device comprising a means for removing oxides generated on the surface of a grindstone by supplying a synthetic machining fluid while vibrating it ultrasonically.