JPH07227761A - Electrolytic dressing device for grinding wheel - Google Patents

Abstract

PURPOSE:To enable grinding and electrostatic dressing of a grinding wheel layer to proceed simultaneously. CONSTITUTION:A feeding electrode 21 is brought into sliding contact with one end of an electrically conductive wheel base metal 20 and a grinding wheel layer 23 is closely secured to the outer peripheral surface of the other end of the wheel base metal 20 with an insulating layer 22 between them, and a feeding electrode 6 is brought into sliding contact with the outer peripheral surface of the grinding wheel layer 23 and an electrically conductive abrasive fluid 12 is supplied to the outer peripheral surface of the grinding wheel layer 23 from a pipe 10, so that the feeding electrodes 6, 21 are made to carry a current between them through the grinding wheel layer 23 and the abrasive fluid 12. Thus electrolytic dressing is carried out whereby abrasive grains are exposed to the surface of the grinding wheel layer 23 by removal of a binder on the surface of the grinding wheel layer 23 through electrolysis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sharpening a grindstone used for grinding by an electrolytic action.
In particular, the present invention relates to an electrolytic sharpening device for a grinding wheel that can be used together with an inner surface having a diameter substantially the same as that of the grinding wheel.

[0002]

2. Description of the Related Art FIG. 17 is a block diagram showing an electrolytic sharpening device for a grindstone, which is also used in the inner surface grinding disclosed in Japanese Patent Laid-Open No. 4-115867. In FIG. 17, a work material 2 is attached to a rotary chuck 1 of a turning center processing machine, and a grindstone body 3 called a metal bond grindstone with a shaft is axially opposed to the work material 2 so as to be reciprocally drivable. It This grindstone body 3 is constructed by fixing a grindstone layer 5 formed by bonding abrasive grains with a conductive binder to the entire outer circumference of a grindstone base metal 4 as a shaft portion. A power supply electrode 6 which is connected to an anode terminal of an electrolytic power source (not shown) by an electric wire and constitutes an anode is brought into slidable contact with the whetstone base 4 of the whetstone body 3. The power supply electrode 7 constituting the cathode is supported by a support member 8 installed at a fixed portion of the grinding machine via an insulator 9, and the power supply electrode 7 covers approximately 1/3 of the outer circumference of the grindstone layer 5 of the grindstone layer 5. It is sized to cover a certain gap along the outer circumference. The arc-shaped electrode surface of the power feeding electrode 7 facing the grindstone layer 5 is provided with a grinding fluid outlet (not shown), and a grinding fluid supply pipe 10 communicating with the grinding fluid outlet is provided on the side surface of the power feeding electrode 7. The conductive grinding fluid supplied from the grinding fluid supply pipe 10 is supplied from the grinding fluid outlet to the gap between the grindstone layer 5 and the power supply electrode 7. Further, on the side surface of the supply electrode 7, there is provided a terminal 11 connected to a cathode terminal of an electrolytic power source (not shown) by an electric wire.

Next, the operation of the above-described conventional electrolytic sharpening device for a grindstone will be described with reference to FIG. In FIG. 18 a, the work material 2 in which the cathode power supply electrode 7 is attached to the rotary chuck 1 is shown.
Is disposed at a distance in the axial direction from the end surface of the cylindrical portion of the.
Then, the grinding stone layer 5 of the grinding stone body 3 contacting the power feeding electrode 6 of the anode before the grinding process is stopped at the position of the power feeding electrode 7, and the conductive grinding fluid 12 is supplied from the grinding fluid supply pipe 10 to the power feeding electrode 7 and this. The binder on the surface of the grindstone layer 5 is electrolyzed and removed by being supplied to the gap between the grindstone layer 5 and the power supply electrodes 6 and 7 through the grindstone body 3 and the grinding fluid 12 so as to be electrolyzed.
Initial setting of the surface of the whetstone layer 5 is performed. In FIG. 10B, the power supply electrode 6 is de-energized, the grinding fluid 12 is supplied, and a constant cut is made inside the cylindrical portion of the work material 2 by the grindstone 3 to traverse grinding to the bottom surface of the cylindrical portion. I do.
Then, the grindstone body 3 is returned to the initial position as shown in FIG. In the diagram c of FIG. 10, while the grinding fluid 12 is being supplied, electricity is again supplied between the power supply electrodes 6 and 7 through the grindstone body 3 and the grinding fluid 12 to electrolyze and remove the binder on the surface of the grindstone layer 5. The surface of the layer 5 is sharpened. After that, the steps of FIGS. 10B and 10C are repeated at regular intervals.

[0004]

In the above-described conventional electrolytic sharpening apparatus for a grindstone, while the grindstone body 3 is repeatedly driven between the work material 2 and the power supply electrode 7 constituting the cathode as described above,
Since it is a configuration that alternately performs electrolytic sharpening and grinding,
Although it is possible to grind the inner surface having a diameter substantially the same as that of the grindstone body, there is a problem that the grinding efficiency is low because the electrolytic grinding time which is the non-grinding processing time is required.

The present invention has been made to solve the above problems, and its purpose is to enable simultaneous progress of grinding and electrolytic sharpening, and to continue grinding while maintaining good sharpness of the grindstone. The purpose is to obtain an electrolytic sharpening device for grindstones.

[0006]

[Means for Solving the Problem] A first aspect described in claim 1.
The grindstone electrolytic dressing apparatus according to the invention is configured such that the power feeding electrode is brought into contact with the grindstone layer formed by binding abrasive grains with a conductive binder so as to be able to conduct electricity.

According to a second aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone in which the feed electrode of the first invention is in sliding contact with the grindstone layer.

According to a third aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone, wherein the grindstone body according to the first invention comprises an abrasive grain and a conductive binder on the peripheral surface of a conductive whetstone base metal. The grinding wheel base of this grinding stone body is fixed to the grinding wheel base of the first invention so that the other feeding electrode that is paired with the feeding electrode that contacts the grinding wheel layer can be energized. Then, the notch portion exposing the grindstone base metal is formed in the grindstone layer and the insulating layer.

According to a fourth aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone, which comprises a grindstone layer comprising abrasive grains and a conductive binder on the peripheral surface of a conductive grindstone base metal according to the third invention. The grinding wheel base of the grinding wheel body fixed by interposing an insulating layer forms a supply path for the grinding liquid, and the grinding wheel base is exposed from the notch formed in the grinding wheel layer and the insulating layer. On the peripheral surface of the gold, a grinding fluid outflow hole communicating with the grinding fluid supply passage is formed.

According to a fifth aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone in which the notch in the third or fourth aspect is a groove.

According to a sixth aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone, wherein the groove in the fifth aspect is a dead end on one end side of the grindstone layer and the insulating layer, and the grindstone layer and the insulating layer form a dead end. The outer peripheral surface and the other end are opened.

According to a seventh aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone in which the groove according to the fourth or fifth aspect is spirally formed on the outer peripheral surface of the grindstone layer. .

According to an eighth aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone in which the notch portion in the third or fourth aspect is constituted by a plurality of holes.

According to a ninth aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone, wherein the grindstone body according to the first invention is formed by arranging a plurality of grooves in a circumferential direction on an outer peripheral surface of the grindstone layer. A plurality of electrode bodies capable of supplying power from a power supply electrode paired with the power supply electrode in contact with the grindstone layer are fixed to the plurality of grooves with an insulating layer interposed.

According to a tenth aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone in which one power feeding electrode is brought into contact with the grindstone layer so that it can be energized, and the other material is fed to a work material ground by the grindstone layer. The electrodes are configured to be in contact with each other so that they can be energized.

[0016]

The electrolytic sharpening device for a grindstone according to the first aspect of the present invention, by energizing the grindstone layer from the supply electrode contacting the grindstone layer,
Enables simultaneous progress of grinding and electrolytic dressing.

The electrolytic sharpening device for a grindstone of the second invention makes it possible to use a mass-produced product as the supply electrode by bringing the supply electrode into slidable contact with the grindstone layer.

In the grindstone electrolytic dressing device of the third aspect of the invention, the surface of the grindstone layer is closer to the surface of the grindstone base and the distance between the grindstone base metal and the cathode portion, which is the exposed part, by the notch exposing the grindstone base metal. Is highlighted in a short time.

In the electrolytic sharpening device for a grindstone of the fourth aspect of the invention, the grinding fluid flows from the supply passage provided in the grindstone base metal into the notch through the outflow hole provided in the outer peripheral surface of the grindstone base exposed in the notch. This ensures that the grinding fluid is supplied between the grindstone layer to be dressed and the exposed portion of the grindstone base metal.

In the electrolytic sharpening device for a grindstone according to the fifth aspect of the invention, since the notch is a groove, even if the size of the grindstone layer in the axial direction is long, the surface of the grindstone layer has one end portion to the other end portion. It is sharply spread over a wide area.

In the electrolytic sharpening device for a grinding stone according to the sixth aspect of the present invention, the groove forming the cutout portion becomes a dead end at one end, so that the groove does not hinder the sliding contact of the supply electrode, and the cutout portion is formed. Since the groove configuring the above is opened at the other end, the grinding liquid supplied to the notch can smoothly flow without stagnation.

In the grindstone electrolytic sharpening device of the seventh aspect of the present invention, since the groove forming the cutout portion has a spiral shape, the path of the grinding fluid from entering the cutout portion to exiting from the cutout portion becomes long,
The grinding fluid is evenly supplied to the entire grindstone layer.

In the electrolytic sharpening device for a grindstone of the eighth aspect of the invention, since the notch is a hole, the exposed position, area and shape of the grindstone base metal exposed from the hole forming the notch are defined in the grindstone layer. Optimize according to the expected amount of damage.

In the electrolytic sharpening device for a grindstone of the ninth invention, a plurality of electrode bodies are circumferentially arranged in parallel on the outer peripheral surface of the grindstone layer so as to be spaced apart from each other, so that only the electrode body which is not in contact with the work material is Power is supplied, power is supplied to all electrode bodies at the same time, and the connection structure of a plurality of electrode bodies is simplified.

The electrolytic sharpening device for a grindstone of the tenth invention is
By energizing between the grindstone layer and the work material, the structure of the grindstone body is simple and the grinding process and the electrolytic dressing can be performed simultaneously.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, each embodiment of the present invention will be described with reference to FIGS.
In the following description, the same parts as those in the conventional example are designated by the same reference numerals. Example 1 (corresponding to claim 1 and claim 2). 1 is a perspective view showing an electrolytic dressing apparatus for a grindstone as Example 1 of the present invention, and FIG. 2 is a view showing a measurement result of a surface roughness of a grindstone by electrolytic dressing according to Example 1.

In FIG. 1, the grindstone body 3 is provided with a grindstone base metal 20 that constitutes a shaft portion formed in a columnar shape by a conductive material such as cemented carbide or steel. One end of this grindstone base metal 20 is provided. A power supply electrode 21 which is connected to a cathode terminal of an electrolytic power source (not shown) by an electric wire and which constitutes a cathode is energized and slidably contacted with the outer peripheral surface. The power supply electrode 21 has a hardness difference from the whetstone base metal 20. It is made of carbon or the like so as to be large.
An insulating layer 22 made of an insulating resin such as epoxy is closely fixed to the entire outer peripheral surface of the other end of the grindstone base 20, and abrasive grains are electrically conductive on the entire outer peripheral surface of the insulating layer 22. A grindstone layer 23 formed by bonding with a binder is closely fixed, and an outer peripheral surface of one end of the grindstone layer 23 is made of carbon which is connected to an anode terminal of an electrolytic power source (not shown) with an electric wire to form an anode. The power supply electrode 6 can be energized and is slidably contacted. The wear resistance of the power supply electrode 6 can be improved by reducing the number of abrasive grains or forming the surface layer of the outer peripheral surface of the grindstone layer 5 which is in sliding contact with the power supply electrode 6 with only a binder. With respect to chatter generated during grinding of the power supply electrodes 6 and 21 forming both the anode and the cathode, the power supply electrodes 6 and 21 are pressed against the grindstone base metal 20 and the grindstone layer 23 because the amplitude of the chatter is very small. Prevent with a spring (not shown). The grinding liquid supply pipe 10 is arranged on the side of the other end of the grindstone base metal 20 at a position where it does not interfere with the power supply electrode 21, and the grinding liquid supply pipe 10 is oblique to the outer peripheral surface of the grindstone layer 5. A conductive grinding fluid 12 is supplied from

Next, the operation of the electrolytic sharpening device for a grindstone of the first embodiment will be described. Power supply electrode 21 of the whetstone base metal 20 of the whetstone body 3
The other end is attached to a grindstone mounting portion of a turning center processing machine (not shown) so as to maintain electrical insulation, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 21 serves as a cathode, and the grindstone layer 23 serves as an anode by the power feeding from the power feeding electrode 6, and both power feeding electrodes 6,
Electricity flows through the grinding liquid 12 between 21 and the binder on the surface of the grindstone layer 23 is electrolyzed to be removed from the surface of the grindstone layer 23, and the abrasive grains are exposed on the surface of the grindstone layer 23. Is set to a roughness suitable for grinding. As a result, the surface of the grindstone layer 23 can be continuously ground while electrolytically sharpening the work material attached to the rotary chuck of the turning center machining machine (not shown) while maintaining good sharpness.

When the degree of roughness due to the electrolytic dressing was measured, the results shown in FIG. 2 were obtained.
The measuring device for this measurement is a surface roughness meter made by Tokyo Seimitsu Co., Ltd. “SURFCOM 470A: measuring probe 90 ° cone with tip nose R5
μm ”, the measurement conditions were a sensitivity of 1000 times and a measurement length magnification of 4000 times, and the method of use was to measure the surface of the grindstone layer 23 in the axial direction with a diamond stylus. In FIG. 2, horizontal 1
The cm corresponds to 10 μm, and the vertical 1 cm corresponds to 40 μm. Figure 2
2A shows the measurement result of the surface of the grindstone layer 23 before electrolytic dressing, and FIG. 2B shows the measurement result of the surface of the grindstone layer 23 after electrolytic dressing. Comparing FIG. 2A and FIG. 2B, the vertical width of the unevenness is 10 in FIG.
While it is within μm, the vertical width of the unevenness is as rough as about 20 μm in the diagram b, and the deep valley portion is the portion where the binder recedes by electrolysis. Therefore, it will be understood that the binder on the surface of the grindstone layer 23 recedes by the electrolysis and can be made visible.

In addition, according to the first embodiment, the power feeding electrode 6 is brought into contact with the outer peripheral surface of the grindstone layer 23 so that it can be slidably contacted so that it can be energized. Therefore, a mass-produced carbon brush is used as the power feeding electrode 6. The power supply electrode 6 can be attached to the grindstone layer 23.
The structure relating to the contact between the power supply electrode 6 and the grindstone layer 23 is simpler and less expensive than the case where the power supply electrode 6 is attached in contact with the outer peripheral surface thereof. In particular, this point corresponds to claim 2.

Further, in the first embodiment, the case where the power feeding electrode 6 is slidably contacted with the outer peripheral surface of the grindstone layer 23 has been illustrated and described, but as shown by the phantom line in FIG. By making sliding contact with the end surface of the power feeding electrode 21 side, it is possible to increase the grinding depth.

Embodiment 2 (corresponding to claims 5 and 6).
FIG. 3 is a perspective view showing an electrolytic sharpening device for a grindstone as a second embodiment of the present invention. In FIG. 3, the grindstone layer 2
3 and the insulating layer 22 have a cutout 2 for exposing the grindstone base metal 20.
4 is formed. The notches 24 are a plurality of grooves that are spaced apart from each other in the circumferential direction of the grindstone layer 23. This notch 24
Each groove becomes a dead end at one end of the grindstone layer 23 and the insulating layer 22 before the other end side of the power supply electrode 6, and is opened to the outer peripheral surface and the other end of the grindstone layer 23 and the insulating layer 22. Has been done. The groove forming the notch 24 is the grindstone layer 23.
By grinding or electric discharge machining the grindstone body 3 configured by being attached to the grindstone base metal 20 with the insulating layer 22 interposed therebetween, and removing the grindstone layer 23 and the insulating layer 22 along the axial direction with a predetermined width. It is formed. The grinding liquid supply pipe 10 is arranged at a side of one end of the grindstone layer 23 so as not to interfere with the power supply electrode 6, and the grinding liquid supply pipe 1 is provided.
0 supplies the grinding fluid 12 from the oblique direction to the outer peripheral surface of the dead end portion of the groove as the cutout portion 24. Further, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 3, the grindstone base metal 20 functions as a cathode by the power feeding electrode 21, the grindstone layer 23 functions as an anode by power feeding from the power feeding electrode 6, and both power feeding electrodes 6, 21 In the meantime, electricity flows through the grinding liquid 12, the binder on the surface of the grindstone layer 23 is dissolved by electrolysis and removed from the surface of the grindstone layer 23, and the abrasive grains are exposed on the surface of the grindstone layer 23, so that the surface of the grindstone layer 23 is ground. It is designed to have a roughness that conforms to.

According to the second embodiment, since the notch 24 is provided in the grindstone layer 23 and the insulating layer 22 and the grindstone base metal 20 is exposed from the notch 24, the surface of the grindstone layer 23 and the grindstone The cathode portion, which is the exposed portion of the base metal 20, is brought closer to the surface, and the surface of the grindstone layer 23 is preferably electrolytically sharpened in a short time. In particular, this point corresponds to claim 3. In addition, since the notch 24 is formed as a groove, even if the size of the grindstone layer 23 in the axial direction is long, the surface of the grindstone layer 23 has a wide range of electrolytic setting from one end to the other end. To be done. In particular, this point corresponds to claim 5.

In addition, since the groove forming the notch 24 becomes a dead end at one end, the groove does not interfere with the sliding contact of the power supply electrode 6. Moreover, since the groove forming the cutout portion 24 is open at the other end, the grinding fluid 12 supplied to the cutout portion 24 and electrolyzing the grindstone layer 23 flows out from the cutout portion 24 without stagnation. , A grinding wheel base metal 20 that also defines a groove in the binder mixed in the grinding fluid 12 due to electrolysis
Is discharged without depositing and adhering to the exposed surface, the insulating layer 22 and the grindstone layer 23. In particular, this point corresponds to claim 6.

In addition, the cutouts 24 are evenly arranged in the circumferential direction of the grindstone body 3 to make the ratio of the exposed area of the grindstone base metal 20 to the surface area of the outer peripheral surface of the grindstone layer 23 constant in the circumferential direction. As a result, the amount of electrolytic sharpening on the grindstone layer 23 can be made uniform, and stable grinding can be performed.

Embodiment 3 (corresponding to claim 7). FIG. 4 is a perspective view showing an electrolytic dressing device for a grindstone as a third embodiment of the present invention. In FIG. 4, the grindstone layer 23 and the insulating layer 2
The notch 24A formed so as to expose the grindstone base metal 20 is a groove, and the groove forming the notch 24A becomes a dead end at one end of the grindstone layer 23 and the insulating layer 22. The groove is open to the outer peripheral surface and the other end, and a groove is formed in a spiral shape so as to turn in the circumferential direction of the grindstone body 3. Further, the grindstone body 3 rotates in the direction of the arrow shown in FIG.
The grindstone base metal 20 functions as a cathode by the power supply electrode 21, the grindstone layer 23 functions as an anode by power supply from the power supply electrode 6, electricity flows between the power supply electrodes 6 and 21 through the grinding fluid 12, and the surface of the grindstone layer 23 The binder is melted by electrolysis to be removed from the surface of the grindstone layer 23 to expose the abrasive grains on the surface of the grindstone layer 23, so that the surface of the grindstone layer 23 has a roughness suitable for grinding.

According to the third embodiment, since each groove forming the cutout portion 24A has a spiral shape, the grinding fluid 12
The path from entering the notch 24A to exiting the notch 24A is longer than that of the notch 24A formed in the linear groove, and the grinding fluid 12 is easily supplied to the entire grindstone layer 23.

Embodiment 4 (corresponding to claims 5 and 6).
FIG. 5 is a perspective view showing an electrolytic sharpening device for a grindstone as a fourth embodiment of the present invention. In FIG. 5, the grindstone body 3 is provided with a grindstone base metal 20A that forms a cylindrical base made of a conductive material such as cemented carbide or steel, and the entire outer periphery of the grindstone base metal 20A is insulated. The layer 22 is closely fixed, and the grindstone layer 23 formed by bonding abrasive grains with a conductive binder is closely fixed to the entire outer peripheral surface of the insulating layer 22. A cutout portion 24B is provided in the cutout portion 24B, and the cutout portion 24B is a plurality of grooves that are spaced apart from each other in the circumferential direction of the grindstone body 3. The grooves forming the cutout portion 24B are opened to the outer peripheral surfaces of the grindstone layer 23 and the insulating layer 22 along the axial direction of the grindstone body 3 and to one end and the other end, and each groove is formed into the grindstone body 3.
It is straight along the axial direction of. The whetstone base metal 20
A power supply electrode 21 forming a cathode is slidably contacted with one end surface of A, and a power supply electrode 6 forming an anode is slidably contacted with one end surface of a grindstone layer 23. , The grinding liquid supply pipe 10 is arranged at a position where it does not interfere with the power supply electrode 21, and the grinding liquid supply pipe 10 supplies the conductive grinding liquid 12 to the outer peripheral surface of the grindstone layer 5. .

According to the fourth embodiment, the feeding electrodes 6, 21
Are in sliding contact with one end surfaces of the grindstone layer 23 and the grindstone base metal 20 on the same side, the entire axial length of the grindstone layer 23 can be used for grinding, and therefore the grinding depth of the grindstone body 3 can be increased. Since the grindstone body 3 according to the fourth embodiment has a configuration in which a groove as the cutout portion 24B is formed in the flat grindstone of the type of the grindstone of the general grinding tool, the grindstone bodies according to the first to third embodiments according to the fourth embodiment are formed. It will be understood that as No. 3, not only the flat type grindstone other than the shaft type but also the cup type or the thin blade grindstone can be used. In addition, since the groove as the cutout portion 24B is open at both ends in the axial direction of the grindstone layer 23, the groove can be formed easily without having to worry about the dead end of the groove when forming the groove. Become.

In the fourth embodiment, the second embodiment and the third embodiment, the cutout portion 24 or 24A or 2 is formed.
4B can be implemented if the number of the grooves constituting 4B is one or more. However, the larger the number of the grooves, the better the finishing of electrolytic dressing. Also, when a plurality of grooves are equally divided in the circumferential direction, they are adjacent to each other. Compared with the case where the distance between the grooves is different, the finished condition of electrolytic dressing is improved.

Example 5 (corresponding to claim 8). 6 is a perspective view showing an electrolytic dressing device for a grindstone as a fifth embodiment of the present invention, and FIG. 7 is a table showing a basic example of optimizing an exposed position, an area and a shape of a grindstone base metal of the fifth embodiment.

In FIG. 6, a notch 24C formed in the grindstone layer 23 and the insulating layer 22 so as to expose the grindstone base metal 20.
Has multiple holes. Further, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 6, the grindstone base metal 20 functions as a cathode by the power feeding electrode 21, the grindstone layer 23 functions as an anode by power feeding from the power feeding electrode 6, and both power feeding electrodes 6, 21 Grinding fluid 1 in between
2 flows electricity, the binder on the surface of the grindstone layer 23 is electrolyzed and is removed from the surface of the grindstone layer 23, and the abrasive grains are exposed on the surface of the grindstone layer 23, so that the surface of the grindstone layer 23 is suitable for grinding. It is supposed to stand out.

According to the fifth embodiment, since the cutout portion 24C is formed by a plurality of holes, the plurality of holes forming the cutout portion 24C are expected in the grindstone layer 23 due to the difference in load during grinding. Grindstone base metal 20 according to the amount of damage
By optimizing the exposure position, area and shape of
The amount of electrolytic sharpening can be optimized. It is basically conceivable that the plurality of holes forming the cutout portion 24C have shapes and arrangements other than those shown in FIG. 6, for example, as shown in FIG. In FIG. 7, in the case of the upper left frame A in which the exposed position, area and shape of the whetstone base metal 20 are uniform, the manufacture is easy and the whetstone layer 23 has high strength. In the case of the lower left frame B in which the exposed position of the grindstone base metal 20 is uniform and the area and shape are deformed, the strength of the grindstone layer 23 is high. In the case of the upper right frame C in which the exposed positions of the whetstone base metal 20 are concentrated and the area and shape are uniform, the manufacturing is easy and damage can be adjusted. In the case of the lower right frame D in which the exposed positions of the whetstone base metal 20 are concentrated and the area and shape are deformed, it is possible to match with the tamages.

Embodiment 6 (corresponding to claim 4). FIG. 8A is a perspective view showing an electrolytic sharpening device for a grindstone as Embodiment 6 of the present invention, FIG. 8B is a sectional view taken along line AA shown in FIG. 8A, and FIG. 9 is this Embodiment 6. It is sectional drawing explaining operation | movement.

In FIG. 8A, the notch 24 formed in the grindstone layer 23 and the insulating layer 22 so as to expose the grindstone base metal 20 becomes a dead end at one end of the grindstone layer 23 and the insulating layer 22. In addition, the groove is opened to the outer peripheral surface and the other end, and a supply passage 25 for the grinding fluid 12 is formed at the axial center of the grindstone base 20.
Of the whetstone base 20 and is closed on the other end surface side of the whetstone base metal 20. A plurality of outflow holes 26 are formed in the outer peripheral surface of the grindstone base metal 20 exposed from the cutouts 24 so as to be spaced apart in the axial direction. The outflow holes 26 penetrate the supply passage 25 as shown in FIG. There is. Further, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 8A, the grindstone base metal 20 functions as a cathode by the power supply electrode 21, the grindstone layer 23 functions as an anode by power supply from the power supply electrode 6, and both power supply electrodes Electricity flows through the grinding fluid 12 between 6 and 21, and the binder on the surface of the grindstone layer 23 is dissolved by electrolysis to be removed from the surface of the grindstone layer 23 to expose the abrasive grains on the surface of the grindstone layer 23. The surface is designed to have a roughness suitable for grinding.

According to the sixth embodiment, as shown in FIG. 9, the grinding wheel layer 23 of the grinding wheel body 3 raises the inner surface of the cylindrical grinding portion of the work material 2 held by the claw 1a of the rotary chuck 1. Grinding liquid 12 during cutting or down cutting
Is supplied from the opening of the supply passage 25 into the supply passage 25, the grinding fluid 12 is supplied from the outflow hole 26 to the inside of the groove from the bottom of the groove forming the notch 24, so that electrolytic grinding is performed. The grinding liquid 12 can be reliably supplied between the whetstone layer 23 and the exposed portion of the whetstone base metal 20.

In the sixth embodiment, the cutout 24 is shown in FIG.
The case of forming a straight groove with one end dead end shown in FIG. 4 has been shown and described as an example. However, the cutout portion 24A formed in the spiral groove as shown in FIG. 4 and the both ends open type as shown in FIG. The cutout portion 24B formed in the groove or the cutout portion 24C formed in the hole as shown in FIG. 6 can be similarly applied.

Example 7 (corresponding to claim 9). 10a
FIG. 11 is a perspective view showing an electrolytic dressing device for a grindstone as Embodiment 7 of the present invention, FIG. 10B is a bottom view of the grindstone body shown in FIG. 10A, and FIG. 11 is a manufacturing process of the grindstone body of Embodiment 7. FIG. 12 is a diagram showing an example, and FIG. 12 is a diagram showing a different example of the manufacturing process of the grindstone body of the seventh embodiment.

In FIGS. 10A and 10B, the power supply electrode 6 constituting an anode is slidably contacted to the outer peripheral surface of one end of the grinding wheel base metal 20 by an electric wire connected to the anode terminal of the electrolytic power source (not shown). And the whetstone body 3 contacts the whetstone base 20 of the whetstone base 20.
A grindstone layer 23 formed by bonding abrasive grains with a conductive binder is closely fixed to the entire outer periphery of the other end of the grindstone layer 23.
A plurality of grooves 27 are formed in the outer peripheral surface of the groove 27 so as to be spaced apart from each other in the circumferential direction, and a plurality of electrode bodies 28 are provided in the plurality of grooves 27 with an insulating layer 22 made of an insulating resin such as epoxy resin interposed. The electrode body 27 is fixed to be spaced apart in the circumferential direction, and is interposed between the outer peripheral surface of the electrode body 27 protruding toward one end of the grindstone layer 23 from the protruding portion 23a located between the grooves 27 of the grindstone layer 23 and the electrode body 27. The power supply electrode 21 which is connected to the cathode terminal of the electrolytic power source by an electric wire and constitutes a cathode is slidably contacted with the outer peripheral surface of the insulating layer 22.

The grindstone body 3 is, for example, as shown in FIG. 11 or FIG.
It is manufactured in the process as shown in. In the case of FIG. 11, one end of the grindstone layer 23 provided on the outer peripheral surface of the other end of the grindstone base metal 20 is ground to form a step 29, and a plurality of grooves 27 are formed on the outer peripheral surface of the grindstone layer 23. While being equally divided in the direction and formed linearly in the axial direction, a plurality of electrode bodies 28 having a longer axial length than the plurality of grooves 27 are formed, and the plurality of electrode bodies 28 are formed in the grindstone layer 23. The other end of the electrode body 28 is aligned with the other end of the grindstone layer 23 by adhering it to the groove 27 with an epoxy-based insulating adhesive, and one end of the electrode body 28 is aligned with the shaft of the one end of the grindstone layer 23. After projecting in the direction, this electrode body 2
The same insulating adhesive or insulating resin as described above is embedded by molding between the one end projecting from the grindstone layer 8 of No. 8 and the grindstone base metal 20 and between the one end of the grindstone layer 23. The insulating layer 22 is formed by the insulating adhesive and the molded insulating adhesive or insulating resin. As a result, the grindstone body 3 shown in FIG. 10 is formed, and the grindstone layer 22, the plurality of electrode bodies 28, and the insulating layer 22 form a single body fixed to the outer peripheral surface of the other end of the grindstone base metal 20, The outer peripheral surfaces of the protrusions 23a located between the grooves 27 of the grindstone layer 23 constituting the outer peripheral surface of the single body, the outer peripheral surfaces of the plurality of electrode bodies 28, and the outer peripheral surface of the insulating layer 22 are substantially flush with each other. . Regarding the flush configuration of the outer peripheral surface, the outer peripheral surface of the protruding portion 23a located between the grooves 27 of the grindstone layer 23, the outer peripheral surface of the plurality of electrode bodies 28, and the insulating layer 22 are trued on the assembling machine. Since it is possible to adjust the step difference with the outer peripheral surface to 1 μm or less, the power feeding electrode 21 can be suitably slidably contacted.

In the case of FIG. 12, a plurality of grooves 27 are equally divided in the circumferential direction on the outer peripheral surface of the grindstone layer 23 formed in a cylindrical shape to form a straight line in the axial direction, while the plurality of grooves are formed. 27, a plurality of electrode bodies 28 having an axial length longer than that of 27 are formed, and the plurality of electrode bodies 28 are bonded to the grooves 27 of the grindstone layer 23 with an epoxy-based insulating adhesive to form the other end portion of the electrode body 28. Is aligned with the other end of the grindstone layer 23, one end of the electrode body 28 is axially projected from one end of the grindstone layer 23, and the grindstone base 20 is inserted into a through hole 23a formed in the center of the grindstone layer 23. After pressing one end of the grindstone base metal 20 so as to project from one end of the grindstone layer 23, between the one end part of the electrode body 28 protruding from the grindstone layer 23 and the grindstone base metal 20 and the grindstone layer 23. The same insulating adhesive or insulating resin as above is molded between the ends. Embedded in the molding, and the insulating layer 22 by the the mold molded insulative adhesive and the insulating adhesive, as a result, the grindstone body 3 shown in FIG. 10
Make up.

According to the seventh embodiment, the grindstone body 3 is shown in FIG.
In the direction indicated by the arrow a in FIG. 4, the grindstone layer 23 functions as an anode by the power feeding from the power feeding electrode 6 through the grindstone base metal 20, and the plurality of electrode bodies 28 intermittently contact the power feeding electrode 21 to serve as the cathode. Working, grinding stone base metal 2 between both feeding electrodes 6, 21
Electricity flows through 0, the grindstone layer 23, and the grinding fluid 12,
The binder on the surface of the protruding portion 23a of the grindstone layer 23 is dissolved by electrolysis and removed from the surface of the protruding portion 23a of the grindstone layer 23, and the abrasive grains are exposed on the surface of the protruding portion 23a of the grindstone layer 23.
The surface of the protrusion 23a of the grindstone layer 23 is set to have a roughness suitable for grinding.

In short, in the seventh embodiment, the plurality of electrode bodies 28 are circumferentially spaced and fixed to the outer peripheral surface of the grindstone layer 23, so that power can be supplied only to the electrode bodies 28 that are not in contact with the work material 2. . As a result, even with a rotary chuck made of a metal material, the grindstone layer 23 can be dressed while grinding the conductive work material without leaking current, so that the rotation made of a conventional metal material can be performed. A chuck can be used. Further, the characteristics of the material used for the plurality of electrode bodies 28 are that it has good formability during truing, that plastic deformation occurs during processing, but it does not reach the grindstone layer 23 side, and that it has electrical conductivity. , That is, the electrode body 2
The material 8 may be a brittle material and exhibits conductivity. For example, the electrode body 28 may be made of carbon, free-cutting brass, or a conductive resin so that the amount of retraction is the same as the amount of recession due to wear of the grindstone layer 23 due to grinding. Since the body 28 wears and recedes, the distance between the grindstone layer 23 and the plurality of electrode bodies 28 is always constant, and stable electrolytic dressing can be performed.

Embodiment 8 (corresponding to claim 9). FIG. 13 is a perspective view showing an electrolytic sharpening device for a grindstone as an eighth embodiment of the present invention. In FIG. 13, the power supply electrode 6 forming an anode is slidably contacted to the outer peripheral surface of one end of the grindstone base 20, and the grindstone body 3 is attached to the other end of the grindstone base 20 of the grindstone base 20. The grindstone layer 23 is closely fixed to the entire outer peripheral surface, and a plurality of grooves 27 are equally spaced in the circumferential direction and linearly formed in the axial direction on the outer peripheral surface of the grindstone layer 23.
A plurality of electrode bodies 28 are individually fixed to each other with an insulating layer 22 made of an insulating resin such as epoxy being interposed, and are located between the grindstone layer 23 of the grindstone base metal 20 and the power supply electrode 6. The ring insulating layer 30 is closely fixed to the outer peripheral surface of the portion, and the conductive ring 31 is closely fixed to the outer peripheral surface of the ring insulating layer 30. This conductive ring 3
A power supply electrode 21 configured as a cathode is slidably contacted with the outer peripheral surface of 1, and a plurality of electrode bodies 28 are attached to the conductive ring 31.
Are connected by a lead wire 32.

According to the eighth embodiment, since the electrode body 28 is made of carbon, free-cutting brass, conductive resin or the like, the electrode body 28 is moved by the same amount as the retreat amount due to the abrasion of the grindstone layer 23 due to the grinding process. Grindstone layer 2 as it wears back
The distance between 3 and the plurality of electrode bodies 28 is always constant, and stable electrolytic setting can be performed. Further, since electric power is supplied to all of the electrode bodies 28 at the same time, electrolytic setting can be performed at all positions of the grindstone layer 23. As a result, it becomes possible to continue the grinding process while maintaining good and stable sharpness.

Embodiment 9 (corresponding to claim 9). 14 is a perspective view showing an electrolytic dressing device for a grindstone as a ninth embodiment of the present invention, and FIG. 15 is a view showing an example of a manufacturing process of a grindstone body of the ninth embodiment. In FIG. 14, the power supply electrode 6 forming an anode is slidably contacted with the outer peripheral surface of one end of the grindstone base 20, and the grindstone layer 23 is closely contacted with the entire outer peripheral surface of the other end of the grindstone base 20. A plurality of grooves 27 are evenly arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 so as to be linearly formed in the axial direction. A conductive ring 31 is individually fixed on the outer peripheral surface of the portion of the grindstone base 20 located between the grindstone layer 23 and the power supply electrode 6 with the insulating layer 22 made of an insulating resin such as a system interposed therebetween. Are closely fixed via the ring insulating layer 30, and the plurality of electrode bodies 2 are attached to the lower end surface of the conductive ring 31.
One end surface of 8 is connected with a conductive adhesive 33, and the outer surface of the conductive ring 31 has a feeding electrode 2 configured as a cathode.
1 is slidably contacted.

The grindstone body 3 of the ninth embodiment is manufactured, for example, in the process shown in FIG. In FIG. 15, a plurality of grooves 27 are equally arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 formed in a cylindrical shape so as to be linearly formed in the axial direction. Multiple long electrode bodies 28
And the plurality of electrode bodies 28 are bonded to the grooves 27 of the grindstone layer 23 with an epoxy-based insulating adhesive.
Is aligned with the other end of the grindstone layer 23 and one end of the electrode body 28 is axially projected from the one end of the grindstone layer 23. The ring insulating layer 30 has a collar 30b at the other end of the tubular body 30a, and a plurality of grooves 30c are formed on the outer peripheral surface of the collar 30b.
This ring insulating layer 30 is externally fitted and attached to the intermediate portion of the grindstone base metal 20 with an adhesive agent interposed, and a conductive ring 31 and an adhesive agent 33 are interposed between the cylindrical body 30a of the ring insulating layer 30. While being externally fitted, the lower end surface of the conductive ring 31 is adhered to the upper surface of the collar portion 30b of the ring insulating layer 30 with a conductive adhesive 33, and the other end portion of the grindstone base metal 20 is connected to the plurality of electrodes. The electrode body 28 protruding from the grindstone layer 23 is inserted into the groove 30c of the ring insulating layer 30 by press-fitting it into the through hole 23a formed in the center of the grindstone layer 23 having the body 28, and one end surface of this electrode body 28 is electrically conductive. The lower end surface of the elastic ring 31 is bonded with a conductive adhesive 33 to form the grindstone body 3 shown in FIG.

According to the ninth embodiment, compared to the eighth embodiment, the structure is simplified without using the lead wire.

Embodiment 10 (corresponding to claim 10). FIG.
FIG. 16A is a sectional view showing an electrolytic dressing device for a grindstone as Embodiment 10 of the present invention, and FIG. 16B is an enlarged sectional view showing a grinding processed portion of Embodiment 10.

In FIG. 16A, the power supply electrode 6 constituting the anode is slidably contacted with the outer peripheral surface of one end of the grindstone base 20, and the entire outer peripheral surface of the other end of the grindstone base 20 is contacted. The grindstone layer 23 formed by bonding the abrasive grains with a conductive binder is closely fixed. Further, a power supply electrode 21 constituting a cathode is brought into contact with a portion other than the grinding portion of the work material 2 and a portion where accuracy is required, and the grinding liquid supply pipe 10 is provided between the contact surfaces of the work material 2 and the grindstone layer 23. The grinding fluid 12 is supplied from

According to the tenth embodiment, although the grindstone body 3 has a simple structure in which the grindstone layer 23 is closely fixed to the outer peripheral surface of the grindstone base metal 20, the surface of the work material 2 facing the grindstone layer 23 is large. Electrolytic dressing is performed on the surface of the binder of the grindstone layer 23,
As a result of this electrolytic sharpening, as shown in FIG. 16B, the binder 34 of the grindstone layer 23 melts and recedes, and the binder 34
The abrasive grains 35 are exposed on the receding surface of.

In the first to tenth embodiments described above, the grindstone body 3 of the type with a shaft is illustrated and described, but in the present invention, a flat grindstone, a cup type or a thin blade grindstone according to the kind of grindstone of a general grinding tool is also used. Of course you can.

[0063]

According to the first aspect of the present invention, since the supply electrode contacting the grindstone layer is energized to the grindstone layer, there is an effect that grinding and electrolytic dressing can proceed simultaneously.

According to the second aspect, since the supply electrode is slidably contacted with the grindstone layer, a mass-produced product such as a carbon brush can be used as the supply electrode, and the structure is simple and inexpensive. effective.

According to the third aspect of the invention, the notch portion exposing the grindstone base metal is arranged such that the surface of the grindstone layer and the distance between the grindstone base metal and the cathode portion which is the exposed portion are close to each other. There is an effect that the surface can be sharpened in a short time.

According to the fourth aspect of the invention, the grinding liquid is configured to flow from the supply passage provided in the grindstone base metal into the cutout portion through the outflow hole provided in the outer peripheral surface of the grindstone base metal exposed in the cutout portion. Therefore, there is an effect that the grinding fluid can be reliably supplied between the whetstone layer to be dressed and the exposed portion of the whetstone base metal.

According to the fifth aspect of the invention, since the notch is formed by the groove, the surface of the grindstone layer extends from one end to the other end even if the dimension of the grindstone layer in the axial direction is long. The effect is that it can be set in a wide range.

According to the sixth aspect of the invention, since the groove forming the cutout portion is formed as a dead end at one end, the groove does not hinder the sliding contact of the supply electrode, and the cutout portion is formed. Since the groove to be formed is open at the other end,
There is an effect that the grinding fluid supplied to the notch flows smoothly without stagnation.

According to the seventh aspect of the invention, since the groove forming the cutout portion is formed in a spiral shape, the path of the grinding fluid from entering the cutout portion to exiting is longer, and the grinding fluid is spread over the entire grindstone layer. The effect is that it can be supplied evenly.

According to the eighth invention, since the notch is formed as a hole, the exposed position, the area and the shape of the grindstone base metal exposed from the hole forming the notch are adjusted to the amount of tame image expected in the grindstone layer. The effect is that it can be optimized together.

According to the ninth aspect of the invention, since the plurality of electrode bodies are arranged on the outer peripheral surface of the grindstone layer in parallel in the circumferential direction, the power is supplied only to the electrode bodies which are not in contact with the work material. It is possible to achieve this, it is possible to supply power to all the electrode bodies at the same time, and it is possible to simplify the connection structure of a plurality of electrode bodies.

According to the tenth aspect of the invention, since the structure is such that the electric current is applied between the grindstone layer and the work material, there is an effect that the structure of the grindstone body is simple and grinding and electrolytic dressing can proceed simultaneously. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an electrolytic sharpening device for a grindstone according to a first embodiment.

FIG. 2 is a diagram showing a measurement result of electrolytic dressing in Example 1.

FIG. 3 is a perspective view showing an electrolytic sharpening device for a grindstone according to a second embodiment.

FIG. 4 is a perspective view showing an electrolytic sharpening device for a grinding stone according to a third embodiment.

FIG. 5 is a perspective view showing an electrolytic sharpening device for grinding wheels according to a fourth embodiment.

FIG. 6 is a perspective view showing an electrolytic sharpening device for a grinding stone according to a fifth embodiment.

FIG. 7 is a chart showing a basic example of optimizing an exposed position, an area, and a shape of a grindstone base metal according to a fifth embodiment.

8A and 8B are diagrams showing an electrolytic sharpening device for a grinding stone according to a sixth embodiment, wherein FIG. 8A is a perspective view and FIG. 8B is a sectional view taken along line AA of FIG.

FIG. 9 is a cross-sectional view illustrating the operation of the sixth embodiment.

10A and 10B are views showing an electrolytic sharpening device for a grindstone according to a seventh embodiment, wherein FIG. 10A is a perspective view and FIG. 10B is a bottom view.

FIG. 11 is a diagram showing an example of a manufacturing process of a grindstone body according to a seventh embodiment.

FIG. 12 is a diagram showing a different example of the manufacturing process of the grindstone body of the seventh embodiment.

FIG. 13 is a perspective view showing an electrolytic sharpening device for a grinding stone according to an eighth embodiment.

FIG. 14 is a perspective view showing an electrolytic sharpening device for a grinding stone according to a ninth embodiment.

FIG. 15 is a diagram showing an example of a manufacturing process of the grindstone body of Example 9;

16A and 16B are views showing an electrolytic sharpening device for a grindstone of Example 10, wherein FIG. 16A is a sectional view and FIG. 16B is an enlarged sectional view of a main part.

FIG. 17 is a perspective view showing a conventional electrolytic dressing device for a grindstone.

FIG. 18 is an operation explanatory view of the conventional electrolytic sharpening device for a grindstone.

[Explanation of symbols]

 2 Work Material 3 Grinding Stone Body 6 Feeding Electrode 12 Grinding Fluid 20 Grinding Stone Base 21 Feeding Electrode 22 Insulating Layer 23 Grinding Stone Layer 24, 24A, 24B, 24C Notch 25 Supply Passage 26 Outflow Hole 27 Groove 28 Electrode Body 34 Binder 35 Abrasive grain

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B24D 5/00 P

Claims (10)

[Claims] 1. The binder on the surface of the grindstone layer is electrolyzed by supplying electric current to the grindstone layer while supplying a grinding liquid to the outer peripheral surface of the grindstone layer formed by bonding the abrasive grains of the grindstone body with a conductive binder. Electrolytic dressing device for grinding stones for sharpening the surface of a grinding stone layer, characterized in that a power feeding electrode is in contact with the grinding stone layer so that it can be energized. 2. The electrolytic sharpening device for a grindstone according to claim 1, wherein the power supply electrode is in sliding contact with the grindstone layer. 3. A grindstone of the grindstone body, wherein the grindstone body is constituted by fixing a grindstone layer made of abrasive grains and a conductive binder to the peripheral surface of a conductive grindstone base metal with an insulating layer interposed therebetween. The other power supply electrode paired with the power supply electrode in contact with the grindstone layer is slidably contacted to the base metal so that the grindstone layer and the insulating layer have a notch portion for exposing the grindstone base metal. The electrolytic sharpening device for a grindstone according to claim 1, wherein 4. The inside of a whetstone base of a whetstone body constituted by fixing a whetstone layer composed of abrasive grains and a conductive binder on an outer peripheral surface of the electrically conductive whetstone base with an insulating layer interposed therebetween. A grinding fluid supply passage is formed in the grinding stone, and a grinding fluid outflow hole communicating with the grinding fluid supply passage is formed on the peripheral surface of the grinding stone base metal exposed from the notch formed in the grinding stone layer and the insulating layer. The electrolytic sharpening device for a grindstone according to claim 3, wherein the sharpening device is formed. 5. The electrolytic sharpening device for a grindstone according to claim 3 or 4, wherein the cutout portion is a groove. 6. The method according to claim 5, wherein the groove is a dead end on one end side of the grindstone layer and the insulating layer, and is opened on the outer peripheral surface and the other end of the grindstone layer and the insulating layer. Electrolytic sharpening device for grindstones. 7. The electrolytic sharpening device for a grindstone according to claim 4, wherein the groove is formed in a spiral shape on the outer peripheral surface of the grindstone layer. 8. The electrolytic sharpening device for a grindstone according to claim 3 or 4, wherein the cutout portion is formed of a plurality of holes. 9. The grindstone body comprises a grindstone layer composed of abrasive grains and a conductive binder, and a plurality of grooves are formed on the outer peripheral surface of the grindstone layer so as to be circumferentially spaced apart from each other, and the plurality of grooves are in contact with the grindstone layer. 2. The electrolytic sharpening of the grindstone according to claim 1, wherein a plurality of electrode bodies capable of supplying power from the other power supply electrode paired with the power supply electrode are individually fixed via an insulating layer. apparatus. 10. The binder on the surface of the grindstone layer is electrolyzed by supplying electric current to the grindstone layer while supplying a grinding liquid to the outer peripheral surface of the grindstone layer formed by bonding the abrasive grains of the grindstone body with a conductive binder. In an electrolytic sharpening device for a grindstone that sharpens the surface of the grindstone layer, one power supply electrode is brought into contact with the grindstone layer so that it can be energized.
An electrolytic sharpening device for a grindstone in which the other power feeding electrode is in contact with the work material ground by this grindstone layer so as to be able to conduct electricity.