JP3494463B2 - Whetstone electrolytic dressing device - Google Patents

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. 10 is a block diagram showing an electrolytic sharpening device for a grindstone, which is also used in the inner surface grinding disclosed in JP-A-4-115867. In FIG. 10, 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 driven. 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. In addition , a terminal 11 connected to the cathode terminal of an electrolytic power source (not shown) by an electric wire is provided on the side surface of the power feeding electrode 7.

Next, the operation of the above-mentioned conventional electrolytic sharpening device for a grindstone will be described with reference to FIG. In FIG. 11 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. 11 b, the power supply electrode 6 is de-energized, the grinding fluid 12 is supplied, and a constant cut is made by the grindstone 3 inside the cylindrical portion of the work material 2 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. 11, while the grinding fluid 12 is being supplied, electricity is again supplied between the power supply electrodes 6 and 7 through the grinding stone body 3 and the grinding fluid 12 to electrolyze and remove the binder on the surface of the grinding stone layer 5. The surface of the layer 5 is sharpened. After that, the steps of FIGS. 11B and 11C 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.
In the grindstone electrolytic dressing apparatus according to the present invention, the surface layer of the grindstone layer in contact with the power supply electrode is formed with less abrasive grains or is formed only with a bonding agent.

According to a second aspect of the present invention, there is provided an electrolytic sharpening apparatus for a grindstone, which is a power supply forming an anode for energization.
The electrode is slidably contacted with one end of the grindstone layer and is not energized.
The power supply electrode that composes the negative electrode for sliding contact with the grinding stone base metal
The other end of the grindstone layer and the insulating layer is touched
It becomes a dead end in front of the side and the grinding stone layer and the insulating layer
A plurality of notches , which are grooves open to the outer peripheral surface and expose the outer peripheral surface of the grindstone base metal, are formed in a circumferentially spaced manner.

According to a third aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone in which a plurality of notches in the second invention are formed in a spiral shape that turns in the circumferential direction of the grindstone body.

[0009] electrolytic dressing device of the grinding wheel according to the fourth invention according to claim 4, dew from notch on the second invention
A plurality of outflow holes are formed on the outer peripheral surface of the whetstone base metal.
Each of the outflow holes is filled with the grinding fluid formed on the shaft center of the whetstone base metal.
It is penetrated through a supply passage for supplying .

According to a fifth aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone, which is a power supply which constitutes an anode for energization.
The electrode is slidably contacted with one end of the grindstone layer and is not energized.
The power supply electrode that composes the negative electrode for sliding contact with the grinding stone base metal
Touched, the grindstone layer and the insulating layer are not
The grindstone becomes a groove open to the peripheral surface and one end and the other end
Multiple notches that expose the outer peripheral surface of the base metal are arranged in the circumferential direction
It was placed and formed .

[0011] electrolytic dressing device of the grinding wheel according to the sixth invention according to claim 6, feeding electrode constituting the anode for passing electricity are slidably in contact with one end of the grinding wheel layer, the conductible The feed electrode that constitutes the cathode for is slidably contacted with the grindstone base metal, and a plurality of holes exposing the outer peripheral surface of the grindstone base metal are formed in the grindstone layer and the insulating layer on the other end side of the power supply electrode. It was done.

[0012]

In the electrolytic sharpening apparatus for a grinding stone of the first aspect of the present invention, the surface layer of the grinding stone layer that is in contact with the power supply electrode has a reduced amount of abrasive grains or is formed of only a bonding agent, so that simultaneous grinding and electrolytic sharpening are performed. The abrasion resistance of the power supply electrode constituting the anode slidably contacting the grindstone layer in the course of progress is improved.

According to a second aspect of the invention, there is provided an electrolytic sharpening device for a grindstone, in which the grindstone layer and the insulating layer are arranged in front of the other end side of the power feeding electrode.
It becomes a dead end and opens on the outer peripheral surface of the grindstone layer and the insulating layer.
By forming a plurality of notches that are released grooves and expose the outer peripheral surface of the grindstone base metal so as to be spaced apart in the circumferential direction, in the simultaneous progress of grinding and electrolytic sharpening, the surface of the grindstone layer and The distance between the whetstone base metal and the cathode portion, which is the exposed portion, is reduced, and the surface of the whetstone layer is sharpened in a short time.

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

According to a fourth aspect of the present invention, there is provided an electrolytic sharpening device for a grindstone in which a plurality of outflow holes are formed on the outer peripheral surface of the grindstone base metal exposed from the notch.
Was formed and each outflow hole was formed in the axial center of the grindstone base metal.
By passing through the supply passage for supplying the grinding fluid , the grinding fluid of the grindstone layer and grindstone base metal to be electrolytically sharpened is desired.
It is reliably supplied between the exposed parts .

[0016] The electrolytic dressing apparatus of the grinding wheel of the fifth aspect of the present invention, abrasive
The stone layer and the insulating layer are the outer peripheral surface and one end of the stone layer and the insulating layer.
On the outer circumference of the grinding wheel base metal as a groove opened to
Multiple notches exposing the surface are spaced apart in the circumferential direction
By being formed, the grinding liquid supplied to the notch is Dian
Flow smoothly without wasting .

The electrolytic dressing device of the grinding wheel of the sixth invention, the sheet
Since a plurality of holes exposing the outer peripheral surface of the grinding wheel base metal are formed in the grindstone layer and the insulating layer on the other end side of the electrode, a plurality of holes are formed in the simultaneous progress of grinding and electrolytic sharpening. By optimizing the exposed position, area and shape of the whetstone base metal in accordance with the amount of damage expected in the whetstone layer due to the difference in load during grinding, the electrolytic dressing amount can be optimized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the present invention will be described below with reference to FIGS. Example 1. 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.

[0019] In FIG. 1, the grinding wheel body 3 includes a grindstone base metal 20 constituting the shaft portion formed in a cylindrical shape with a conductive material such as cemented carbide or steel, the grindstone base metal 20
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 of one end of the whetstone base metal 20.
It is formed of carbon or the like so that the hardness difference between 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.

What degree of roughness is caused by the electrolytic dressing
Then, the result as shown in FIG. 2 was obtained. The measuring device for this measurement uses a surface roughness meter "Surfcom 470A: measuring probe 90 ° cone tip nose R5μm" manufactured by Tokyo Seimitsu Co., Ltd.
The measurement length magnification was 4000 times, and the method of use was to measure the surface of the grindstone layer 23 in the axial direction with a diamond probe. In FIG. 2, 1 cm in width corresponds to 10 μm and 1 cm in length corresponds to 40 μm. 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. This a in FIG.
Comparing the figure and the figure b, in the figure a, the vertical width of the unevenness is within 10 μm, whereas in the figure b, the vertical width of the unevenness is as rough as about 20 μm, and the deep valleys are This is the part where the binder has receded 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, since the power feeding electrode 6 contacts the outer peripheral surface of the grindstone layer 23 so as to be capable of energizing and slidingly contacting, the 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 .

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.

Example 2. 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 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 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 feeding 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 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.

Example 3. 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
The notch portion 24A formed so as to expose the grindstone base metal 20 to the insulating layer 22 is a groove. The notch portion 24A
The groove that constitutes a dead end at one end of the grindstone layer 23 and the insulating layer 22 and is open to the outer peripheral surface and the other end,
Further, the groove is formed in a spiral shape so as to rotate in the circumferential direction of the grindstone body 3. Further, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 4, 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 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.

Example 4. FIG. 5 is a perspective view showing an electrolytic sharpening device for a grindstone as a fourth embodiment of the present invention. Oite in FIG. 5, the grinding wheel body 3 includes a grindstone base metal 20A constituting the base is formed in a cylindrical shape with a conductive material, such as such as cemented carbide or steel, the outer circumference entire surface of the grindstone base metal 20A is The insulating 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.
The notch 24B is provided in the grindstone layer 23 and the insulating layer 22,
The notch 24B is a plurality of grooves that are spaced apart from each other in the circumferential direction of the grindstone body 3. Each groove constituting the cutout portion 24B is 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, one end and the other end, and each groove is arranged in the axial direction of the grindstone body 3. It is straight along. The whetstone base metal 2
The power feeding electrode 21 forming a cathode is slidably contacted with one end surface of the 0A, and the power feeding electrode 6 forming an anode is slidably contacted with one end surface of the 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. 6 is a perspective view showing an electrolytic sharpening 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. .

[0034] In Fig. 6, a notch is formed to expose the grindstone base metal 20 to the grindstone layer 23 and the insulating layer 22 24
C has a plurality of 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 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 fifth embodiment, since the cutout portion 24C is formed of 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. If exposed position of the grindstone base metal 20 of the frame D in the lower right is the area and shape variations in concentration can be adjusted to da Mae <br/> di.

Example 6. FIG. 8a is a perspective view showing an electrolytic sharpening device for a grindstone as a sixth embodiment of the present invention, and FIG. 8b is a view shown in FIG.
FIG. 9 is a sectional view taken along line A, and FIG. 9 is a sectional view for explaining the operation of the sixth embodiment.

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.

In the first to sixth 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.

[0041]

According to the first aspect of the present invention, since the surface layer of the grindstone layer in contact with the power supply electrode is formed with a reduced amount of abrasive grains or only with a bonding agent, the anode which is slidably contactable with the grindstone layer There is an effect that it is possible to improve the wear resistance of the power supply electrode constituting the.

According to the second invention, the grindstone layer and the insulating layer
When the dead end at the other end short of the power feed electrode
Both are grooves open to the outer peripheral surface of the grindstone layer and the insulating layer.
Since a plurality of notches exposing the outer peripheral surface of the whetstone base metal are formed so as to be spaced apart from each other in the circumferential direction, the distance between the surface of the whetstone layer and the whetstone base metal and the cathode part which is the exposed part is reduced, and the whetstone layer The effect is that the surface of can be sharpened in a short time.

According to the third 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 is long, and the grinding fluid is the entire grinding stone layer. It has the effect that it can be supplied evenly.

According to the fourth invention, it is exposed from the notch.
Multiple outflow holes are formed on the outer peripheral surface of the whetstone base metal.
The exit hole supplies the grinding fluid formed on the axial center of the whetstone base metal.
Since the through the supply passage for the grinding liquid electrolyte dressing
Securely between the whetstone layer you want to perform and the exposed part of the whetstone base metal
There is an effect that it can be supplied .

According to the fifth invention, the grindstone layer and the insulating layer
On the outer peripheral surface of the grindstone layer and the insulating layer and at one end and the other end
A plurality of open grooves that expose the outer peripheral surface of the grinding wheel base metal
Since the notch portion is formed is spaced in the circumferential direction of the switching
There is an effect that the grinding fluid supplied to the cutout portion smoothly flows without stagnation .

According to the sixth aspect of the invention, the other end than the feeding electrode
Since multiple holes that expose the outer peripheral surface of the grinding wheel base metal were formed in the grinding wheel layer and the insulating layer on the part side , match the multiple holes to the expected damage amount to the grinding wheel layer due to the difference in load during grinding. By optimizing the exposed position, area and shape of the whetstone base metal, there is an effect that the electrolytic sharpening amount can be optimized.

[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.

FIG. 10 is a perspective view showing a conventional electrolytic sharpening device for a grindstone.

FIG. 11 is an operation explanatory view of the conventional electrolytic sharpening device for a grindstone.

[Explanation of symbols]

2 Work material 3 grindstone 6 feeding electrode 12 grinding fluid 20 Whetstone base metal 21 Feeding electrode 22 Insulation layer 23 Whetstone layer 24, 24A, 24B, 24C Notch 25 supply passage 26 Outflow hole

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-73268 (JP, A) JP-A-51-45398 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23H 5/00 B24B 53/00 B24D 3/00-18/00

Claims (6)

(57) [Claims] 1. A supply of a grinding fluid in which a conductive binder for bonding the abrasive grains of a grindstone layer formed by interposing an insulating layer on the outer peripheral surface of a grindstone base having conductivity in a grindstone body has conductivity. By being electrolyzed by energization in the state of being, in a grinding stone electrolytic dressing device for dressing the grindstone layer, the power feeding electrode constituting the anode for the energization is slidably contacted to the grindstone layer, The power supply electrode constituting the cathode for is slidably contacted to the grindstone base metal, the surface layer of the power supply electrode in the grindstone layer is in contact with the less abrasive grains or is formed only with a bonding agent Electrolytic sharpening device for grindstones. 2. A supply of a grinding fluid having a conductive binding agent for binding the abrasive grains of a grinding stone layer formed by interposing an insulating layer on an outer peripheral surface of a grinding stone base metal having conductivity in a grinding stone body. In the grinding stone electrolytic dressing device that dresses the grindstone layer by being electrolyzed by energization in the charged state, the power feeding electrode that constitutes the anode for the energization can slidably contact one end of the grindstone layer. To the grinding stone base metal so that the feeding electrode forming the cathode for energization is slidably brought into contact with the grinding stone layer and the insulating layer before the other end side of the feeding electrode.
It will stop and open to the outer peripheral surface of the grindstone layer and the insulating layer
Electrolytic dressing device for a grindstone, wherein a plurality of notches that form a groove and expose the outer peripheral surface of the grindstone base metal are formed so as to be spaced apart in the circumferential direction. 3. The electrolytic sharpening device for a grindstone according to claim 2, wherein the plurality of notches are formed in a spiral shape that turns in the circumferential direction of the grindstone body. 4. A plurality of outflow holes are formed on the outer peripheral surface of the whetstone base metal exposed from the notch, and each outflow hole is a supply for supplying the grinding fluid formed at the axial center of the whetstone base metal. The electrolytic sharpening device for a grindstone according to claim 2, wherein the device is penetrated through the passage. 5. A whetstone base metal having conductivity in a whetstone body.
The abrasive grains of the grindstone layer formed on the outer peripheral surface of the
The conductive binder that binds is supplied with a conductive grinding fluid.
The grindstone is
In the electrolytic setting device of the grindstone for setting the layer,
The feed electrode that constitutes the anode for energization is one end of the grindstone layer
It is slidably contacted with the
The power feeding electrode is slidably contacted with the grinding wheel base metal,
Layer and insulating layer are the outer peripheral surface and one end of the grindstone layer and the insulating layer.
And the groove opened to the other end becomes the outer peripheral surface of the grinding wheel base metal
A plurality of notch grinding stone of the electrolytic dressing device you characterized in that formed <br/> are spaced circumferentially to expose. 6. A supply of a grinding fluid having a conductive binding agent for binding the abrasive grains of a grinding stone layer formed by interposing an insulating layer on the outer peripheral surface of a grinding stone base metal having conductivity in a grinding stone body. In the grinding stone electrolytic dressing device that dresses the grindstone layer by being electrolyzed by energization in the charged state, the power feeding electrode that constitutes the anode for the energization can slidably contact one end of the grindstone layer. And the power supply electrode that constitutes the cathode for the above-mentioned energization is slidably contacted with the grinding wheel base metal, and the above-mentioned power supply is performed.
An electrolytic sharpening device for a grindstone, wherein a plurality of holes exposing the outer peripheral surface of the grindstone base are formed in the grindstone layer and the insulating layer on the other end side of the electrode .