JP4274461B2 - Electrolytic dressing method using universal electrode for electrolytic dressing - Google Patents

Description

The present invention relates to an electrolytic dressing method using a universal electrode for electrolytic dressing.

Patent Document 1 discloses an electrolytic dressing means called an electrolytic in-process dressing method (hereinafter referred to as “ELID grinding method”) by the applicant of the present application.
This ELID grinding method applies a voltage between a grindstone having a contact surface with a workpiece, an electrode facing the contact surface, a nozzle for flowing a conductive liquid between the grindstone and the electrode, and the grindstone and the electrode. A device comprising a power source and a power feeder is used to apply a voltage between the grindstone and the electrode while flowing a conductive liquid between the grindstone and the electrode, thereby dressing the grindstone by electrolysis.

The dressing mechanism by this ELID grinding method is shown in FIG. At the start of sharpening the grinding wheel (A), a relatively large current (5 to 10 A) flows with little electrical resistance between the grinding wheel and the electrode. Thereby, the metal part (bond) on the surface of the grindstone is dissolved by the electrolytic effect, and non-conductive diamond abrasive grains protrude. Further, when energization is continued, an insulating film mainly composed of iron oxide (Fe ₂ O ₃ ) is formed on the surface of the grindstone, and the electric resistance of the grindstone increases. As a result, the current is decreased, the dissolution of the bond is reduced, and the protrusion of the abrasive grains (sharpening of the grindstone) is substantially finished (B). When grinding is started in this state (C), the diamond abrasive grains are worn as the workpiece is ground while the coating releases the grinding waste. When grinding continues (D), the insulating coating on the surface of the grindstone is removed by abrasion, the electric resistance of the grindstone decreases, the current between the grindstone and the electrode increases, the dissolution of the bond increases, and the protrusion of the grindstone (grindstone) Will be resumed. Therefore, during grinding by ELID grinding method, as shown in (B) to (D), excessive elution of bonds is suppressed by forming and removing the coating, and the protrusion of the abrasive grains (sharpening of the grinding stone) is automatically adjusted. The The cycle shown in (B) to (D) is hereinafter referred to as “ELID cycle”.

  In the ELID grinding method described above, even if the abrasive grains are made fine, clogging of the grinding stone does not occur due to the sharpening of the grinding stone by the ELID cycle, so if the abrasive grains are made fine, an extremely excellent machining surface such as a mirror surface can be obtained by grinding. Can do. Therefore, the ELID grinding method has a feature that the sharpness of the grindstone can be maintained from high efficiency grinding to mirror grinding.

  In addition, since the ELID grinding described above uses a high-strength metal-bond superabrasive grindstone formed by sintering a mixture of abrasive grains, metal bonds, etc., it is difficult to finish the grindstone into the required shape, Since an electrode corresponding to the shape of the grinding wheel is manufactured and this is transferred by electric discharge machining to process the grinding wheel, there is a problem that it takes time and money to manufacture the grinding wheel including the electrode for electric discharge machining, and this problem is solved. For this purpose, Patent Document 2 has been proposed.

  As shown in FIG. 8, the “electrolytic dressing method using a universal grinding wheel” in Patent Document 2 includes a universal grinding wheel 50 composed of a plurality of grinding wheel elements 56 that are fixed to a rotating spindle 52. And forming an electrode 53 for electrolytic dressing having the same cross-sectional shape as the outer peripheral surface of the free-form grindstone by grinding the graphite material 53 with the free-form grindstone 50, and grinding the workpiece 51 with the free-form grindstone, Electrolytic dressing is performed by flowing a conductive liquid between the universal grindstone and the electrode.

Japanese Patent No. 1947329 Japanese Patent No. 3295896

Since the electrode 12 for electrolytic dressing in Patent Document 2 described above is a graphite material ground with a universal grindstone, it is brittle compared to a normal metal material and has a problem that it is easily chipped during use.
Further, it has been difficult to adjust the gap between the conventional electrode for electrolytic dressing and the grindstone. For example, in the case of an electrode ground with the above-mentioned universal type grindstone, the same surface shape as the outer peripheral surface of the grindstone can be formed, but unevenness in electrolytic strength easily occurs between the outer peripheral surface of the grindstone, for example, the central portion of the electrolytic region However, there is a problem that the outer edge portion tends to be weak and the unevenness cannot be adjusted.
Furthermore, the conventional electrode for electrolytic dressing has a problem that it is difficult to apply to the measurement of the dimensional / shape change amount of the grindstone and the cleaning of the electrode surface.

The present invention has been made to solve such problems. That is, the object of the present invention is to easily form the same surface shape as the outer peripheral surface in accordance with the shape of the grindstone, fine adjustment of the electrolytic surface corresponding to the non-uniformity of the electrolytic strength, and the size and size of the grindstone An object of the present invention is to provide an electrolytic dressing method using a free electrode for electrolytic dressing that can be applied to measurement of the amount of shape change and cleaning of the electrode surface.

According to the reference example , a bar made of a plurality of elongated conductive bars having the same cross-sectional shape and stacked in a cross-sectional shape having a size covering at least a part of the electrolytic surface of the corresponding electrolytic dressing grindstone in close contact with each other. A collecting electrode part;
Maintaining the cross-sectional shape of the bar material collecting electrode part, and switching the friction force between adjacent conductive bar materials to large or small, and sliding each bar material in the length direction when the friction force is large An electrode holder for electrolytic dressing is provided, comprising: an electrode holder that prevents sliding of each bar when the frictional force is small.

According to the present invention, a bar made of a plurality of elongated conductive bars having the same cross-sectional shape and stacked in a cross-sectional shape having a size covering at least a part of the electrolytic surface of the corresponding electrolytic dressing grindstone in close contact with each other. The cross-sectional shape of the collective electrode portion and the rod collective electrode portion is maintained, and the frictional force between adjacent conductive rods is switched between large and small, and the length of each bar when the frictional force is large The electrode holder has an electrode holder that prevents sliding in the direction and allows sliding in the length direction of each bar when the frictional force is small, and friction between the conductive bars Electrode forming that switches the force to a small size and presses the bar aggregate electrode portion in the length direction against the electrolytic surface of the electrolytic dressing grindstone to form an electrode for electrolytic dressing having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone Between step and conductive bar Switches the frictional force large, a gap is provided between the electrode and the grindstone surface, while grinding the workpiece by the grindstone, possess the electrolytic dressing step for electrolytic dressing by passing a conductive liquid between the grindstone and the electrode After the electrolytic dressing step, the bar assembly electrode portion is positioned at the electrode position in the electrode forming step while maintaining a large frictional force between the conductive bars, and then the frictional force between the conductive bars , Slide each conductive bar individually in the length direction and press each conductive bar in the length direction against the electrolytic surface of the grindstone. There is provided an electrolytic dressing method using a universal electrode for electrolytic dressing characterized by measuring .
Further, according to the present invention, a plurality of elongated conductive bars having the same cross-sectional shape are stacked in a cross-sectional shape having a size covering at least part of the electrolytic surface of the corresponding electrolytic dressing grindstone in close contact with each other. Maintaining the cross-sectional shape of the bar assembly electrode section and the bar assembly electrode section, and switching the frictional force between adjacent conductive bars to large or small, and when the frictional force is large, An electrode holder for preventing the sliding in the length direction and enabling the sliding in the length direction of each bar when the frictional force is small, between the conductive bars The electrode is used for electrolytic dressing having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone by switching the frictional force to a small amount and pressing the bar aggregate electrode portion in the length direction against the electrolytic surface of the electrolytic dressing grindstone. Electrode forming step and conductivity An electrolytic dressing step in which the frictional force between the materials is largely switched, a gap is provided between the electrode and the grindstone surface, and an electrolytic dressing is performed by flowing a conductive liquid between the grindstone and the electrode while grinding a workpiece with the grindstone. have a said applied to electrolytic dressing and reverse voltage between the grindstone and the electrode, when the reverse electrolysis, switches the frictional force between the conductive bars to the small and each bar is individually slide Electrolytic dressing using a universal electrode for electrolytic dressing, characterized in that it is pressed against the grinding wheel surface and the distribution of the electrolytic strength between the grinding wheel and the electrode surface is measured from the amount of movement and the gap is set to an appropriate and uniform electrolytic strength. A method is provided.

According to the universal electrode of the reference example and the electrolytic dressing method of the present invention, the friction force between the conductive rods is switched to a small value by the electrode holder in the electrode forming step, and the rods are assembled on the electrolytic surface of the corresponding electrolytic dressing grindstone. By simply pressing the electrode part in the length direction, each conductive bar individually follows the electrolytic surface of the grindstone, and an electrolytic dressing electrode having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone can be formed.
Next, in the electrolytic dressing step, the frictional force between the conductive bars is switched to a large value by the electrode holder, a gap is provided between the electrode and the grindstone surface, and the work is ground between the grindstone and the conductive material between the grindstone and the electrode. Electrolytic dressing can be performed by flowing a liquid.
Therefore, an electrode having the same surface shape as the outer peripheral surface can be easily formed in accordance with the shape of the grindstone, and the workpiece can be ground while using the electrode to electrolytically dress the grindstone.
In addition, after the electrolytic dressing step, the bar assembly electrode portion is positioned at the electrode position in the electrode forming step while maintaining a large frictional force between the conductive rods, and then the friction between the conductive rods Switch the force to small, slide each conductive bar individually in the length direction, and press each conductive bar in the length direction against the electrolytic surface of the grindstone. Since the surface position of the bar aggregate electrode portion hardly changes by electrolytic dressing, the dimensional / shape change amount of the grindstone (for example, the grindstone wear amount) can be measured by remote control.
Further, a voltage opposite to that of the electrolytic dressing is applied between the grindstone and the electrode, and during reverse electrolysis, the frictional force between the conductive bars is switched to a small level, and each bar is individually slid to grindstone surface. By measuring the distribution of the electrolytic strength between the grinding wheel and the electrode surface from the amount of movement, and setting a gap to an appropriate and uniform electrolytic strength, the grinding stone part facing the bar with a large amount of movement is highly electrolyzed This means that the gap between the grindstone and the electrode is short, and vice versa, and after sliding the individual rod-shaped electrodes, the gap between the grindstone and the entire electrode can be set.

The electrode holder changes a frictional force between a holding member that holds the bar aggregate electrode part in the cross-sectional shape and a plurality of conductive bar members that constitute the bar aggregate electrode part held by the holding member. It consists of a pressing device.
With this configuration, the pressing force (for example, a pressing plate and an electromagnetic chuck) is used to change the pressing force applied to the bar assembly electrode portion held by the holding member, thereby increasing or decreasing the frictional force between the conductive bar members. Can be switched.

  In addition, a plurality of actuators are provided that are in close contact with the end faces of the plurality of conductive rods constituting the rod-collecting electrode portion and individually slide the rods in the length direction. With this configuration, the frictional force between the conductive bars is switched to a small level, and a plurality of actuators (for example, piezoelectric elements) are individually controlled, and each bar is individually slid in the length direction by remote control. Can do.

In addition, the frictional force between the conductive rods is switched to small between the electrode forming step and the electrolytic dressing step or after the electrolytic dressing step, and each conductive rod is individually slid in the length direction. An electrode correcting step of correcting the electrode shape;
In this way, when the electrolytic strength is uneven with the outer peripheral surface of the grindstone (for example, the central portion of the electrolysis region is strong and the outer edge portion tends to be weak), this unevenness is caused by surface discoloration or electrolysis. Judging from the amount, the position of each conductive bar can be adjusted.

In addition, after the electrolytic dressing step, a voltage opposite to the electrolytic dressing is applied between the grindstone and the electrode, and the electrode surface is cleaned by reverse electrolysis.
According to this method, metal ions electrolyzed from the conductive grindstone by electrolytic dressing adhere to the electrode surface like plating, but this can be cleaned by reverse electrolysis.

As described above, the electrode for electrolytic dressing of the reference example and the electrolytic dressing method using the same can easily form the same surface shape as the outer peripheral surface according to the shape of the grindstone, and cope with non-uniformity in electrolytic strength. Thus, the electrolytic surface can be finely adjusted, and it has excellent effects such as measurement of the dimensional / shape change amount of the grindstone and application to cleaning of the electrode surface.

  Hereinafter, preferred embodiments of the present invention will be described. In addition, the same code | symbol is attached | subjected and used for the common part in each figure.

FIG. 1 is an overall perspective view of a free electrode for electrolytic dressing according to a reference example . In this figure, the entire universal electrode is shown in a disassembled state, and the universal electrode for electrolytic dressing 10 of the reference example includes a bar aggregate electrode portion 12 and an electrode holder 14.

The bar assembly electrode portion 12 is composed of a plurality of elongated conductive bars 11 having the same cross-sectional shape. The conductive bar 11 is made of a metal material having a small electric resistance. The cross-sectional shape of the conductive bar 11 may be circular, rectangular, or other shapes. Moreover, although the cross-sectional dimension of the electroconductive rod 11 is so preferable that it is thin, arbitrary things can be used according to the required shape.
In the rod aggregate electrode portion 12, the conductive rods 11 are laminated with the side surfaces in close contact with each other to form a predetermined cross-sectional shape as a whole. The cross-sectional shape is set to a size that covers at least a part of the electrolytic surface of the electrolytic dressing grindstone corresponding to the electrode when used as an electrode in the electrolytic dressing.
In addition, it is preferable that the electrical resistance of the side surface of the conductive bar 11 is sufficiently small in a state where the side surfaces are in close contact with each other. Further, in this example, four layers of conductive rods 11 arranged in a flat plate shape are laminated, but the number of laminations is arbitrary, and a single layer may be used if necessary.

The electrode holder 14 includes a holding member 15 and a pressing device 16.
In this example, the holding member 15 includes a holding casing 15a having a U-shaped cross section and a lid member 15b whose upper and lower ends are fixed to the holding casing 15a. The rectangular cross-sectional shape is maintained.
Further, the pressing device 16 is attached to the flat pressing plate 16a and the lid member 15b sandwiched between the holding casing 15a and the lid member 15b together with the bar collecting electrode portion 12, and the pressing plate 16a faces the holding casing 15a. It consists of an electromagnetic chuck 16b for pressing.

With this configuration, it is possible to change the pressure applied to the bar-collecting electrode portion 12 held by the holding member 15 (holding casing 15a and lid member 15b) by the pressing device 16 (the pressing plate 16a and the electromagnetic chuck 16b). In addition, this change in pressure switches the frictional force between the conductive bar members 11 to a large or small level, and when the frictional force is large, the sliding of each bar is prevented in the longitudinal direction. In this case, each bar can slide in the length direction.
The electromagnetic chuck 16b and a spring may be used together, and when the electromagnetic chuck is not excited, the friction force may be increased by pressing with the spring and weakened by exciting the electromagnetic chuck, and the friction force may be switched to a smaller value. The reverse is also possible. Furthermore, conductive magnetic not limited to the chuck, other biasing means may be, for example, a pneumatic cylinder or a manual biasing device (bolts and nuts, or spring) or the like.

According to the universal electrode 10 of the reference example described above, the friction force between the conductive rods 11 is switched to a small value by the holding device 16 of the electrode holder 14, and the rod-collecting electrode portion is long on the electrolytic surface of the corresponding electrolytic dressing grindstone. By simply pressing in the vertical direction, each conductive bar 11 follows the electrolytic surface of the grindstone individually, and an electrode for electrolytic dressing having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone can be formed.

Figure 2 is a diagram illustrating how to use the self-standing electrode of Example. This example shows a case where the grindstone 2 has a special shape for processing a neutron lens, for example. Against the grindstone 2 in such a special shape, using a universal electrode 10 of the reference example described above, switches the frictional force between more conductive bars to the electrode holder 14 to the small, the electrolytic surface of the corresponding electrolytic dressing grinding wheel 2 Electrode dressing electrodes having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone 2, each conductive bar 11 individually following the electrolytic surface of the grindstone 2 simply by pressing the bar aggregate electrode portion 11 in the length direction. Can be molded.

  In addition, in this example, the case where the cross-sectional dimension of the electroconductive bar 11 is large compared with the grindstone 2 of a special shape is shown, and the shape of the front-end | tip 11a of each electroconductive bar 11 is post-processed. However, this post-processing is not essential, and the post-processing can be omitted by using a thinner conductive bar 11.

FIG. 3 is a diagram showing an electrolytic dressing method using the universal electrode of the reference example . Explaining the basic electrolytic dressing methods using FIG.
The electrolytic dressing method includes a universal electrode preparation step (A), an electrode forming step (B), and an electrolytic dressing step (C).
In the universal electrode preparation step (A), the above-described electrode 10 for electrolytic dressing is prepared.
In the electrode forming step (B), the friction force between the conductive bars is switched to a small value by the pressing device 16 of the electrode holder 14, and the bar aggregate electrode is placed on the electrolytic surface 2 a (the outer peripheral surface in this example) of the electrolytic dressing grindstone 2. The electrode 12 for electrolytic dressing which has the same surface shape as the electrolytic surface 2a of the electrolytic dressing grindstone 2 is formed by pressing the portion 12 in the length direction.
In the electrolytic dressing step (C), the frictional force between the conductive rods 11 is switched to a large value, and a gap is provided between the electrode and the grindstone surface as shown in FIG. Electrolytic dressing is performed by flowing a conductive liquid between the electrode 2 and the electrode 10, and using the power source 4 to apply the grindstone 2 positive (+) and the electrode 10 negative (−) between the grindstone 2 and the electrode 10. .

According to the above-mentioned electrolytic dressing method, switches the frictional force between the conductive bars 11 in the small in the electrode forming step (B), the electrolytic surface of the corresponding electrolytic dressing grinding wheel 2 and hold the bar set electrode portion 12 By simply pressing in the vertical direction, each conductive bar 11 can individually follow the electrolytic surface of the grindstone, and the electrolytic dressing electrode 10 having the same surface shape as the electrolytic surface 2a of the electrolytic dressing grindstone can be formed.
Next, in the electrolytic dressing step (C), the frictional force between the conductive bars is switched to a large level, a gap is provided between the electrode and the grindstone surface, and the workpiece 1 is ground with the grindstone 2 while the grindstone 2 and the electrode 10. Electrolytic dressing can be performed by flowing a conductive liquid between them.
Therefore, the electrode 10 having the same surface shape as the outer peripheral surface thereof can be easily formed in accordance with the grindstone shape 2, and the workpiece can be ground while using the electrode 10 for electrolytic dressing.

  Further, the frictional force between the conductive bars 11 is switched to a small value between the electrode forming step (B) and the electrolytic dressing step (C) or after the electrolytic dressing step (C), and each conductive bar When the electrode strength step (D) for correcting the electrode shape by individually sliding 11 in the length direction is provided, the electrolytic strength is uneven with the outer peripheral surface of the grindstone (for example, in the electrolytic region). The position of each conductive bar can be adjusted by judging this non-uniformity from the amount of consumption due to discoloration or electrolysis of the surface).

FIG. 4 is a diagram illustrating adjustment of the gap with the grindstone using the universal electrode of the reference example . In this example, the electrode 10 for electrolytic dressing of the reference example is further in close contact with the end surfaces of the plurality of conductive bars 11 constituting the bar aggregate electrode part 12, and each bar 11 is individually slid in the length direction. A plurality of moving actuators 18 are provided. The actuator 18 is a piezoelectric element in this example.
The end surfaces on the counter electrode side of the plurality of conductive rods 11 are preferably located on the same plane as in this example.
The plurality of piezoelectric elements 18 may be piezoelectric actuators in which piezoelectric elements are two-dimensionally arranged at a fine pitch (for example, 30 μm × 30 μm).
In this figure, reference numeral 17 denotes a clamping member that clamps the piezoelectric element 18 between the end face of the conductive bar 11 opposite to the electrode. This clamping member is mechanically connected to the holding member 15 described above, and directly adds the expansion / contraction amount of the piezoelectric element 18 due to a change in applied voltage to the conductive rod 11.
With this configuration, the frictional force between the conductive rods is switched to a small level, voltage is individually applied to the plurality of piezoelectric elements, and each rod is individually slid in the length direction by remote control. The gap with the grindstone by the electrode correction step (D) can be automatically adjusted.

FIG. 5 is a diagram showing measurement of the dimensional / shape change amount of the grindstone using the universal electrode of the reference example . In this example, the electrode 10 for electrolytic dressing of the reference example further includes a sensor 19 that detects the amount of movement of each conductive bar 11 between the plurality of piezoelectric elements 18 and the sandwiching member 17. For example, the sensor 19 detects the amount of movement of each conductive bar 11 from the output of each piezoelectric element 18.

Moreover, in the method of the present invention, as shown in this figure, after the electrolytic dressing step (C), the rod is placed at the electrode position in the electrode forming step (B) while maintaining a large frictional force between the conductive rods. The material assembly electrode part 12 is positioned again, and then the frictional force between the conductive bar members is switched to a small one, and each conductive bar member 11 is individually slid in the length direction to be electrically conductive on the electrolytic surface of the grindstone. The bar 11 is pressed in the length direction, and the dimension / shape change amount (for example, grinding wheel wear amount) of the grindstone is measured from the moving amount.
By this method, since the surface position of the bar assembly electrode portion 12 hardly changes by electrolytic dressing, the dimensional / shape change amount (for example, grinding wheel wear amount) of the grindstone can be measured by remote control.

FIG. 6 is a diagram showing electrode cleaning using the universal electrode of the reference example . In this example, after the electrolytic dressing step (C), contrary to FIG. 3, using the power source 4, the grindstone 2 is made negative (−) and the electrode 10 is made positive (+) between the grindstone 2 and the electrode 10. Apply and clean the electrode surface by reverse electrolysis.
By this method, metal ions electrolyzed from the conductive grindstone by the electrolytic dressing adhere to the electrode surface like plating, but this can be cleaned by reverse electrolysis.

Furthermore, in the method of the present invention, a voltage opposite to that of the electrolytic dressing is applied between the grindstone 2 and the electrode 4, and the frictional force between the conductive bars is switched to a small value during the reverse electrolysis, so that each bar 11 is Bars with a large amount of movement by sliding individually and pressing against the grinding wheel surface, measuring the distribution of electrolytic strength between the grinding wheel 2 and the electrode surface from the amount of movement, and setting the gap to an appropriate and uniform electrolytic strength This means that the grindstone part facing the electrode is strong in electrolysis, so the gap between the grindstone and the electrode is short, and vice versa, after sliding each bar electrode, set the gap between the grindstone and the entire electrode. Can do.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a whole perspective view of the universal electrode for electrolytic dressing by a reference example . It is a figure which shows the usage method of the universal electrode of a reference example . It is a figure which shows the electrolytic dressing method using the universal electrode of a reference example . It is a figure which shows clearance gap adjustment with the grindstone using the universal electrode of a reference example . It is a figure which shows the measurement of the dimension and the shape variation of a grindstone using the universal electrode of a reference example . It is a figure which shows the electrode cleaning using the universal electrode of a reference example . It is explanatory drawing which shows the ELID cycle in an ELID grinding method. FIG. 3 is a schematic diagram of “Electrolytic dressing method using a universal grindstone” in Patent Document 2;

Explanation of symbols

1 Workpiece, 2 Electrolytic dressing stone, 2a Electrolytic surface, 4 Power supply,
10 universal electrodes, 11 conductive rods, 12 rod assembly electrodes,
14 electrode holder, 15 holding member,
15a holding casing, 15b lid member,
16 pressing device, 16a pressing plate, 16b electromagnetic chuck,
17 clamping member, 18 piezoelectric element, 19 sensor

Claims (2)

A plurality of elongated conductive rods having the same cross-sectional shape, and a bar-collecting electrode portion stacked in a cross-sectional shape having a size covering at least a part of the electrolytic surface of the corresponding electrolytic dressing grindstone in close contact with each other; Maintains the cross-sectional shape of the bar aggregate electrode part and switches the friction force between adjacent conductive bars to large or small, preventing the sliding of each bar in the length direction when the friction force is large And an electrode holder that enables sliding in the length direction of each bar when the frictional force is small, and a free electrode for electrolytic dressing,
Electrolytic dressing having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone by switching the frictional force between the conductive rods to a small level and pressing the bar aggregate electrode portion in the length direction against the electrolytic surface of the electrolytic dressing grindstone An electrode forming step for forming an electrode for use;
Electrolytic dressing is performed by switching the frictional force between the conductive bars to a large level, providing a gap between the electrode and the grindstone surface, and flowing a conductive liquid between the grindstone and the electrode while grinding the workpiece with the grindstone. It has a dressing step,
After the electrolytic dressing step, while maintaining a large frictional force between the conductive rods, positioning the rod assembly electrode portion at the electrode position in the electrode forming step,
Next, the frictional force between the conductive bars is changed to a small level, and each conductive bar is individually slid in the length direction to press each conductive bar in the length direction against the electrolytic surface of the grindstone. An electrolytic dressing method using a free electrode for electrolytic dressing, characterized in that the amount of change in the size and shape of a grindstone is measured from the amount . A plurality of elongated conductive rods having the same cross-sectional shape, and a bar-collecting electrode portion stacked in a cross-sectional shape having a size covering at least a part of the electrolytic surface of the corresponding electrolytic dressing grindstone in close contact with each other; Maintains the cross-sectional shape of the bar aggregate electrode part and switches the friction force between adjacent conductive bars to large or small, preventing the sliding of each bar in the length direction when the friction force is large And an electrode holder that enables sliding in the length direction of each bar when the frictional force is small, and a free electrode for electrolytic dressing,
Electrolytic dressing having the same surface shape as the electrolytic surface of the electrolytic dressing grindstone by switching the frictional force between the conductive rods to a small level and pressing the bar aggregate electrode portion in the length direction against the electrolytic surface of the electrolytic dressing grindstone An electrode forming step for forming an electrode for use;
Electrolytic dressing is performed by switching the frictional force between the conductive bars to a large level, providing a gap between the electrode and the grindstone surface, and flowing a conductive liquid between the grindstone and the electrode while grinding the workpiece with the grindstone. It has a dressing step,
A voltage opposite to that of the electrolytic dressing is applied between the grinding wheel and the electrode. During reverse electrolysis, the frictional force between the conductive bars is switched to a small level, and each bar is slid individually and pressed against the grinding wheel surface. An electrolytic dressing method using a free electrode for electrolytic dressing, characterized in that a distribution of electrolytic strength between a grindstone and an electrode surface is measured from the amount of movement, and a gap is set to an appropriate and uniform electrolytic strength .

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