JP7157990B1 - Electrolytic dressing method suitable for cylindrical grinding of steel rolls - Google Patents

Abstract

Provided are an electrolytic dressing device and an electrolytic dressing method suitable for cylindrical grinding of steel rolls. Equipped with a conductive grinding wheel used for grinding a steel roll for rolling, an electrode facing the grinding wheel with a gap, and a power supply for supplying power to the grinding wheel and the electrode, the gap between the grinding wheel and the electrode An electrolytic dressing device that supplies a conductive grinding fluid to the electrode to electrolytically remove the grinding powder of the steel roll adhering to the surface of the grinding wheel during grinding, wherein the electrode has a metal surface facing the grinding wheel and a portion other than the surface facing the grinding wheel is made of an insulating material.

Description

The present invention relates to an electrolytic dressing apparatus and an electrolytic dressing method suitable for cylindrical grinding of steel rolls for rolling.

Steel rolling rolls include types such as cast steel and tool steel (die steel, high-speed steel). Hot rolling, which rolls a hot material, heats the material to a high temperature and makes it soft. The purpose of hot rolling is to reduce the sheet thickness by crushing the material as much as possible while it is still hot. Large diameter cast steel rolls are used for hot rolling. After hot rolling, it becomes a plate or coil, and becomes a thick plate product. Cold rolling is the process of rolling hot-rolled thick plate products into thin plates and ribbon products. The plates and coils are already cooled and at room temperature. The strength of the material is higher at room temperature than at high temperature, and the force required for rolling is greater. The rolls used for cold rolling are made of higher strength steel that is as strong as the raw material. Therefore, high-alloy tool steels such as die steels and high-speed steels are also used. The high alloy gives the rolls higher strength and toughness, making it possible to roll high-strength materials. In particular, polished strip steel such as high-strength stainless steel is used for springs and the like, and can be said to be a representative high-hardness material. High-alloy high-speed steel rolls are suitable for cold-rolling this, but repeated cold-rolling requires periodic regrinding. However, since high-speed steel has high strength and toughness, regrinding is a difficult process.

Rolling a plate or band material with steel rolls leaves marks on the surface where the material and the roll come into contact. If this mark is left as it is, the material that is subsequently rolled will have a shape defect or a flaw, resulting in a problem. The rolls are therefore regularly reground. However, since die steel and high-speed steel have high strength and toughness, roll grinding powder tends to adhere to the surface of the grinding wheel, causing clogging and making grinding difficult. As a result, there is a problem that it takes a long time to grind one roll. If the grindability is poor, the grinding efficiency decreases, and as a result, the production efficiency of plates and strips also decreases. In particular, high-speed steel, which contains more alloying elements and amounts than die steel, is often used for rolling when producing high-strength stainless steel sheets and strips, as described above. By rolling with high-speed steel rolls, the rolled sheet or strip has good surface properties and a beautiful appearance. However, as described above, high-speed steel rolls have poor grindability and are used less frequently than die steel. Improving the process of regrinding the rolling rolls leads to improving the quality of metal plate and band products.

As a technique for improving the above-described grindability, there is a technique for performing electrolytic dressing (in-process) on the surface of the grindstone at the same time as the grinding process. FIG. 7 shows a typical configuration of a conventional electrolytic dressing device. Also, for example, there is a technique disclosed in Patent Document 1. The grinding apparatus disclosed in Patent Document 1 includes a grindstone for grinding a workpiece, an electrode for electrolytic dressing in which the electrode surface is opposed to the grinding surface of the grindstone with a gap for interposing the grinding fluid, and the grinding fluid is interposed. The machine is equipped with a power supply for energizing the grindstone and the electrode for electrolytic dressing, and grinds the workpiece while electrolytically dressing the surface of the grindstone. However, the conventional technique disclosed in Patent Document 1 is for electrolytically dressing the grindstone itself, and is not for electrolytically removing the grinding powder adhering to the surface of the grindstone.

In addition, since the electrodes used in the conventional electrolytic dressing apparatus as shown in FIG. 7 are metal blocks, they are heavy and therefore have poor manufacturability, portability, and installation properties, and require high costs. .

JP 2010-234474 A

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrolytic dressing apparatus and an electrolytic dressing method suitable for cylindrical grinding of steel rolls.

In order to solve the above problems, the electrolytic dressing apparatus according to the present invention comprises a conductive grinding wheel used for grinding steel rolls for rolling, an electrode facing the grinding wheel with a gap, and a grinding wheel and the electrode. and an electrolysis that supplies a conductive grinding fluid to the gap between the grinding wheel and the electrode to electrolytically remove the grinding powder of the steel roll adhering to the surface of the grinding wheel during grinding. In the dressing device, the surface of the electrode facing the grinding wheel is made of a thin metal plate, and the portion other than the surface facing the grinding wheel is made of an insulating material.

The electrode may have a hollow interior, the thin plate may have a plurality of minute grinding fluid supply holes, and the grinding fluid may be supplied to the gap through the inside of the electrode and the grinding fluid supply holes.

The inside of the electrode is divided by at least one partition wall, and the grinding liquid supply hole has a hole diameter corresponding to the inside of the electrode largely divided by the partition wall, and the electrode is divided into small parts by the partition wall. may be formed differently from the corresponding grinding liquid supply holes.

When the above electrode is used as the first electrode, the same electrode as the first electrode is further provided as a second electrode so as to face the grinding wheel at a position different from the first electrode with a gap, and the power source is the grinding wheel. Alternatively, power may be supplied to the second electrode.

Either one of the electrodes may be provided vertically above the grinding wheel.

Either one of the electrodes may be provided vertically below the grinding wheel.

The bearing further comprises a conductive bearing, the outer race of which is electrically connected to the power supply by a power supply line, the bearing being electrically fixed to the shaft of the grinding wheel, and the power supply supplying power to the grinding wheel through the bearing. Also good.

The bond material of the grinding wheel may be a metal resin bond material obtained by adding metal fibers to the resin bond material to impart electrical conductivity.

The grinding wheel may have a count of #400 to #2,000.

The abrasive grains of the grinding wheel may be CBN abrasive grains.

The slats may have an arc length greater than 15 percent of the circumference of the grinding wheel.

In addition, the electrolytic dressing method according to the present invention supplies a conductive grinding fluid to the gap between a conductive grinding wheel used for grinding a steel roll for rolling and an electrode facing the grinding wheel with a gap. An electrolytic dressing method for electrolytically removing grinding powder from a steel roll adhering to the surface of the grinding wheel during grinding by supplying power to the grinding wheel and the electrode from a power supply, wherein the electrode faces the grinding wheel. The surface is composed of a thin metal plate with a plurality of minute grinding fluid supply holes, and the part other than the surface facing the grinding wheel is hollow with an insulating material, and the grinding fluid is supplied to the inside of the electrode and the grinding fluid. A grinding liquid supply step of supplying the grinding fluid to the gap through the supply hole is provided.

When the above electrode is used as the first electrode, a second electrode installation step of installing the same electrode as the first electrode as the second electrode at a position different from the first electrode so as to face the grinding wheel with a gap. and a power supply switching step of switching power supply to the grinding wheel to power supply to the second electrode.

a feed bearing preparation step of preparing a conductive bearing whose outer race is electrically connected to a power supply by a feed line; In addition, power may be supplied to the grindstone from a power source through the bearing.

ADVANTAGE OF THE INVENTION According to this invention, the electrolytic dressing apparatus and electrolytic dressing method suitable for cylindrical grinding of a steel roll can be provided.

It is the figure which showed the structure of the electrolytic dressing apparatus which concerns on 1st embodiment of this invention. It is the figure (front view) which showed the electrode which concerns on 1st embodiment of this invention. It is the figure (side view) which showed the electrode which concerns on 1st embodiment of this invention. FIG. 2 is a view (cross-sectional view taken along the line AA) showing the electrode according to the first embodiment of the present invention; It is the figure (side view) which showed the attachment which concerns on 1st embodiment of this invention. It is the figure (front view) which showed the attachment which concerns on 1st embodiment of this invention. It is the figure which showed the structure of the electrolytic dressing apparatus which concerns on 2nd embodiment of this invention. FIG. 4 is a diagram (front view) showing an electrode according to a second embodiment of the present invention; FIG. 4 is a diagram (side view) showing an electrode according to a second embodiment of the present invention; FIG. 4 is a diagram (sectional view taken along the line BB) showing an electrode according to a second embodiment of the present invention; FIG. 10 is a diagram (sectional view taken along the line BB) showing a modification of the electrode according to the second embodiment of the present invention; It is the figure which showed the structure of the electrolytic dressing apparatus which concerns on 3rd embodiment of this invention. It is the figure which showed the structure of the modification of the electrolytic dressing apparatus which concerns on 3rd embodiment of this invention. It is a diagram showing an example of the configuration of a conventional electrolytic dressing device.

An electrolytic dressing apparatus and an electrolytic dressing method according to the present invention will be described below. It should be noted that, throughout each figure, the same reference numerals denote the same or equivalent parts.

First, an electrolytic dressing device 100 according to a first embodiment of the present invention will be described.

FIG. 1 is a diagram showing the configuration of an electrolytic dressing apparatus 100 according to the first embodiment of the invention. The electrolytic dressing device 100 comprises a grinding wheel 102, an electrode 103 and a power supply 104. Reference numeral 101 is a steel roll for rolling. Reference numeral 105 denotes a grinding liquid supply source (tank), and reference numeral 106 denotes a nozzle for discharging the grinding liquid, which is connected to the grinding liquid supply source (tank) by a tube (hose).

The grinding wheel 102 is a cylindrical conductive wheel used for grinding the steel roll 101, and is rotated by a rotating shaft supported by a device such as a cylindrical grinder (not shown). Although various existing bond materials can be applied to the grinding wheel 102, since the metal bond is hard, it repels the steel roll and may cause defects such as smashing on the surface of the steel roll. Therefore, as the bond material for the grinding wheel 102, a metal resin bond material obtained by adding metal fibers to the resin bond material to impart electrical conductivity (conductivity) is suitable. As the grit of the grinding wheel 102, various existing grit can be applied. was found to be suitable. In addition, the count (grain size) described in this specification is JIS R 6001-1: 2017 (grain size of abrasive for grinding wheel-Part 1: coarse grain) and JIS R 6001-2: 2017 (grinding wheel Granularity of Abrasives for Use-Part 2: Fines), and the notation normally used in the industry of manufacturing and selling grinding wheels. As the abrasive grains of the grinding wheel 102, various existing types can be applied, but as a result of extensive experiments, the applicant of the present application has found that CBN is suitable.

The electrode 103 is an electrode for electrolytically removing grinding dust from the steel roll 101 adhering to the surface of the grinding wheel 102 . The electrode 103 is block-shaped as shown, and has an electrode surface with an arcuate cross section. This electrode surface has a long rectangular shape facing the outer peripheral surface of the grinding wheel 102, and has a gap, for example 0.5 mm to 7.0 mm, that allows the conductive grinding liquid to intervene between the electrode surface and the outer peripheral surface of the grinding wheel 102. It is formed in the shape of a cylindrical inner peripheral surface so that a gap of a certain degree is formed. Although FIG. 1 shows a state in which the electrodes 103 are arranged side by side with the grinding wheel 102, the positions at which the electrodes 103 are provided are not limited to this.

The electrode 103 will now be further described with reference to FIGS. 2A-2C. 2A is a front view of electrode 103, FIG. 2B is a side view of electrode 103, and FIG. 2C is a cross-sectional view of electrode 103 taken along line AA. As shown in the figure, the surface of the electrode 103 facing the grinding wheel 102 , that is, the electrode surface having an arcuate cross section is formed of a metal thin plate 201 . The electrode 103 is made of an insulating material 200 except for the surface facing the grinding wheel 102 . As a specific material for the thin plate 201, various metals such as titanium and copper can be applied. The width of the thin plate 201 (width in the lateral direction in FIG. 2B) is preferably equal to or greater than the width of the grinding wheel 102 . As specific materials for the insulating material 200, various plastics such as vinyl chloride and polycarbonate can be applied. By configuring the electrode 103 as described above, the weight is significantly reduced compared to the conventional electrode which is entirely made of metal, and the manufacturability, portability, and installation are improved, and the cost is reduced. effect is obtained. Although the size of the electrode surface is not particularly limited, as a result of diligent experiments by the applicant of the present application, the length of the electrode surface in the circumferential direction, that is, the arc length of the thin plate 201 corresponds to the circumferential length (peripheral length) of the grinding wheel 102. is more than 15% (that is, the ratio of the thin plate 201 covering the grinding wheel 102 in the circumferential direction is more than 15%), a good effect is obtained.

The power source 104 is a power source that supplies (powers) the grinding wheel 102 and the electrode 103 with an appropriate voltage and current according to the grinding conditions. As the power supply 104, various types of power supplies such as a DC power supply, a DC pulse power supply, an AC power supply, and a bipolar amplifier can be applied. In this embodiment, power is supplied to the electrode 103 (thin plate 201 ) through a power supply line (wiring) 108 and to the grinding wheel 102 through a power supply line (wiring) 109 . Although power may be supplied to the grinding wheel 102 by a brush provided at the tip of the power supply line 109, if power is supplied via a power supply attachment 107 (bearing 301), which will be described later, Power can be supplied more stably.

Next, the attachment 107 that enables stable power supply to the grindstone 102 will be described with reference to FIGS. 3A and 3B. 3A is a side view of attachment 107, and FIG. 3B is a front view of attachment 107. FIG. As shown, the attachment 107 has a bearing 301 as its main component and a sleeve 300 that houses the bearing 301 therein. However, the sleeve 300 may be omitted as appropriate. The bearing 301 is electrically conductive (electrically conductive), and is fixed to the shaft (rotating shaft) of the grinding wheel 102 so as to be electrically conductive. The imparting of conductivity (electricity) to the bearing 301 is realized, for example, by using conductive (electrical conductivity) grease when assembling the bearing 301 . The bearing 301 is electrically connected to the power source 104 by fixing the power supply line (wiring) 109 to the outer race. The method of fixing the power supply line (wiring) 109 to the outer race is not particularly limited. A method of directly fixing to is applicable. By supplying power to the grinding wheel 102 via the bearing 301, stable power supply is possible compared to power supply by a brush that wears out with use. Also, the effect of reducing the number of discarded parts can be obtained.

The operation of the electrolytic dressing apparatus 100 described above will be described. First, an electrode 103 is fixed so as to face a conductive grinding wheel 102 used for grinding a steel roll 101 with a gap that allows a conductive grinding liquid to intervene. Subsequently, the grinding liquid is supplied from the nozzle 106 to the gap between the grinding wheel 102 and the electrode 103 , and the power supply 104 supplies power to the grinding wheel 102 and the electrode 103 . As a result, the grinding powder of the steel roll 101 adhering to the surface of the grinding wheel 102 during grinding is continuously removed electrolytically (electrolytic dressing), and the abrasive grains of the grinding wheel 102 are kept in contact with the steel roll 101. and improve grindability. A conductive (conducting) bearing 301 having an outer race electrically connected to the power supply 104 via a power supply line (wiring) 109 is prepared and provided so as to be energized to the shaft of the grinding wheel 102 . By supplying power to the grinding wheel 102 from the power supply 104, stable power supply is possible.

Next, an electrolytic dressing device 400 according to a second embodiment of the invention will be described.

FIG. 4 is a diagram showing the configuration of an electrolytic dressing device 400 according to a second embodiment of the invention. Electrolytic dressing device 400 includes grinding wheel 102 , electrode 401 and power supply 104 . A steel roll 101, a grinding wheel 102, a power supply 104, a grinding liquid supply source (tank) 105, an attachment 107, a power supply line (wiring) 108 and a power supply line (wiring) 109 are the same as those in the first embodiment.

The electrode 401 is an electrode for electrolytically removing grinding dust from the steel roll 101 adhering to the surface of the grinding wheel 102 . The electrode 401 is block-shaped as shown, and has an electrode surface with an arcuate cross section. This electrode surface has a long rectangular shape facing the outer peripheral surface of the grinding wheel 102, and has a gap, for example 0.5 mm to 7.0 mm, that allows the conductive grinding liquid to intervene between the electrode surface and the outer peripheral surface of the grinding wheel 102. It is formed in the shape of a cylindrical inner peripheral surface so that a gap of a certain degree is formed. Although FIG. 4 shows the electrode 401 arranged side by side with the grinding wheel 102, the position of the electrode 401 is not limited to this.

The electrode 401 will now be further described with reference to FIGS. 5A-5C. 5A is a front view of electrode 401, FIG. 5B is a side view of electrode 401, and FIG. 5C is a cross-sectional view of electrode 401 taken along line BB. As shown in the figure, the surface of the electrode 401 facing the grinding wheel 102 , that is, the electrode surface having an arcuate cross-section is composed of a metal thin plate 502 . The electrode 401 is made of an insulating material 500 except for the surface facing the grinding wheel 102 . As a specific material for the thin plate 502, various metals such as titanium and copper can be applied. The width of slat 502 (width in the lateral direction in FIG. 5B) is preferably equal to or greater than the width of grinding wheel 102 . As specific materials for the insulating material 500, various plastics such as vinyl chloride and polycarbonate can be applied. By configuring the electrode 401 as described above, the weight can be significantly reduced compared to the conventional electrode which is entirely made of metal. effect is obtained. Although the size of the electrode surface is not particularly limited, as a result of diligent experiments by the applicant of the present application, the length of the electrode surface in the circumferential direction, that is, the arc length of the thin plate 502 corresponds to the circumferential length (peripheral length) of the grinding wheel 102. is more than 15 percent (that is, the ratio of the grinding wheel 102 covered by the thin plate 502 in the circumferential direction is more than 15 percent), a good effect is obtained.

Here, the electrode 401 has a hollow interior 504 , at least one grinding fluid introduction port 501 provided in the insulating material 500 , and a plurality of minute grinding fluid supply holes 503 in the thin plate 502 . is provided, which is different from the electrode 103 according to the first embodiment. The grinding fluid introduction port 501 is an opening for introducing the grinding fluid into the interior 504 of the electrode 401, and is connected to a grinding fluid supply source (tank) via a tube (hose). Although the electrode 401 is provided with the grinding liquid inlet 501 on the front surface, it may be provided on another surface such as the back surface. By configuring the electrode 401 as described above, the grinding fluid is uniformly supplied to the gap between the grinding wheel 102 and the electrode 401 through the inside 504 of the electrode 401 and the grinding fluid supply hole 503 (the grinding fluid supply process). As a result, local non-uniformity in the flow of the grinding fluid on the electrode surface can be eliminated, and the surface properties of the grinding wheel 102 can be kept constant. When the electrode 401 is provided at the position shown in FIG. 4, the hole diameter of the grinding liquid supply hole 503 can be made smaller toward the lower side (the hole diameter of the grinding liquid supply hole 503 can be made larger toward the upper side). By decreasing the hole diameter of the grinding liquid supply holes 503 in the lower part, uneven supply of the grinding liquid from the lower part to the upper part can be eliminated.

Electrode 401 can also be configured as shown in FIG. 5D. That is, at least one partition wall 505 that divides the interior 504 can be provided in the interior 504 of the electrode 401 . By providing the partition wall 505 in the interior 504 of the electrode 401, the rigidity of the electrode 401 can be increased, and the grinding fluid introduced from the grinding fluid introduction port 501 can be distributed in the interior 504 of the electrode 401 in a well-balanced manner. . When the interior 504 of the electrode 401 is divided into different sizes (capacities) by the partition 505, the grinding liquid supply holes 503 (503L) corresponding to the interior 504 (504L) largely divided by the partition 505 and the partition The hole diameter of the grinding liquid supply hole 503 (503S) corresponding to the interior 504 (504S) divided by 505 can be made different. For example, the grinding liquid supply hole 503 (503L) corresponding to the interior 504 (504L) largely divided by the partition wall 505 has a small hole diameter, and the grinding liquid supply hole 503 corresponding to the interior 504 (504S) divided into small pieces by the partition wall 505. (503S) can be a large pore size. The opposite is also possible. The interior 504 (504L) largely divided by the partition wall 505 is divided into smaller parts by the partition wall 505 and the grinding fluid supply hole 503 (503L) corresponding to the interior 504 (504L) divided by the partition wall 505 according to the conditions such as the position, direction and angle of the electrode 401, and the viscosity of the grinding fluid. By making the hole diameter of the grinding liquid supply hole 503 different from that of the grinding liquid supply hole 503 (503S) corresponding to the inner part 504 (504S), the grinding liquid can be supplied to the gap between the grinding wheel 102 and the electrode 401. can be eliminated.

According to the electrolytic dressing device 400 according to the second embodiment of the present invention described above, the grinding powder of the steel roll 101 adhering to the surface of the grinding wheel 102 during grinding is continuously electrolytically removed (electrolytic dressing ), the abrasive grains of the grinding wheel 102 can be kept in contact with the steel roll 101, and the grindability is improved. Incidentally, similarly to the electrolytic dressing device 100 according to the first embodiment of the present invention, a conductive (conducting) bearing 301 having an outer race electrically connected to the power source 104 via a power supply line (wiring) 109 is prepared. If the shaft of the grinding wheel 102 is energized by the power source 102 and power is supplied to the grinding wheel 102 from the power supply 104 through the bearing 301, stable power supply is possible.

Next, an electrolytic dressing device 600 according to a third embodiment of the invention will be described.

FIG. 6A is a diagram showing the configuration of an electrolytic dressing device 600 according to the third embodiment of the invention. Electrolytic dressing device 600 includes grinding wheel 102 , electrode 401 , electrode 601 and power source 104 . The electrodes 401 are the same as in the first embodiment. Further, the steel roll 101, the grinding wheel 102, the power source 104, the grinding liquid supply source (tank) 105, and the power supply line (wiring) 108 are the same as in the first embodiment.

The electrode 401 is an electrode (first electrode) for electrolytically removing grinding dust from the steel roll 101 adhering to the surface of the grinding wheel 102 . The configuration of the electrode 401 is the same as that of the second embodiment. Although FIG. 6A shows a state in which the electrodes 401 are arranged side by side with the grinding wheel 102, the positions at which the electrodes 401 are provided are not limited to this. Further, although the electrode 401 according to the second embodiment is used as the first electrode in this embodiment, the first electrode may be the electrode 103 according to the first embodiment.

The electrode 601 is an electrode (second electrode) having the same configuration as the electrode 401 as the first electrode. The electrode 601 as the second electrode is provided at a different position from the electrode 401 as the first electrode so as to face the grinding wheel 102 with a gap therebetween (second electrode installation step). Although FIG. 6A shows the electrode 601 provided vertically below the grinding wheel 102, the position of the electrode 601 is not limited to this.

In the electrolytic dressing device 600 according to the third embodiment of the present invention, the power supply 104 supplies power to the electrode 601 (second electrode) instead of the grinding wheel 102 via the power supply line (wiring) 109 (power supply switching step).

According to the electrolytic dressing device 600 according to the third embodiment of the present invention described above, the grinding powder of the steel roll 101 adhering to the surface of the grinding wheel 102 during grinding is continuously electrolytically removed (electrolytic dressing ), the abrasive grains of the grinding wheel 102 can be kept in contact with the steel roll 101, and the grindability is improved. In addition, since the power source 104 supplies power to the electrode 401 (first electrode) and the electrode 601 (second electrode), the grinding wheel 102 can be supplied with power directly from the brush or through the bearing 301 . power supply becomes unnecessary.

Here, the positions where the electrode 401 (first electrode) and the electrode 601 (second electrode) are provided are not particularly limited. It does not occupy the surrounding space and can be easily installed just by placing the electrodes. Also, if one of the electrodes is provided vertically above the grinding wheel 102 as in the modification shown in FIG. Grinding fluid can be efficiently supplied to the gap between.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the scope of the present invention.

For example, fine grooves through which the grinding liquid can flow can be formed on the electrode surface so that the grinding liquid supplied from the grinding liquid supply hole 503 can be distributed over the entire electrode surface along the grooves. Thereby, the uniformity of the supply of the grinding fluid to the gap between the grinding wheel and the electrode is further improved.

According to the electrolytic dressing apparatus and the electrolytic dressing method according to the present invention, the frequency of use of high-speed steel rolling rolls is increased, and the difficulty of manufacturing plates and strips having high-performance surfaces is reduced. The electrolytic dressing apparatus and electrolytic dressing method according to the present invention can also be applied to high-performance rolls other than tool steel (for example, cemented carbide rolls and ceramic rolls). In addition, according to the electrolytic dressing apparatus and the electrolytic dressing method according to the present invention, it is possible to improve the surface quality when cold-rolling a material with high hardness and toughness such as stainless steel. Possibilities for cold rolling hard and tough materials will expand, and applications of hard and tough materials other than stainless steel will expand. Further, according to the electrolytic dressing apparatus and the electrolytic dressing method according to the present invention, there arises a possibility of using a material (for example, a superalloy) having higher strength and toughness than steel as the material of the hot rolling rolls.

100 Electrolytic Dressing Device 101 Steel Roll 102 Grinding Wheel 103 Electrode (First Electrode)
104 Power supply 105 Grinding liquid supply source (tank)
106 Nozzle 107 Attachment 108 Feeder line (wiring)
109 feed line (wiring)
200 insulating material 201 sheet 300 sleeve 301 bearing 302 hole 400 electrolytic dressing device 401 electrode (first electrode)
500 insulating material 501 grinding fluid inlet 502 thin plate 503 grinding fluid supply hole 503L grinding fluid supply hole 503S grinding fluid supply hole 504 inside (internal space)
504L inside (internal space)
504S inside (internal space)
505 partition wall 600 electrolytic dressing device 601 electrode (second electrode)
700 Electrolytic dressing device 701 Electrode 702 DC power supply 703 Feeder line (wiring)
704 power supply line (wiring)

Claims (1)

A conductive grinding fluid is supplied to the gap between a conductive grinding wheel used for grinding a steel roll for rolling and an electrode facing the grinding wheel with a gap, and the grinding wheel and the electrode are separated. is powered from a power supply to electrolytically remove grinding powder of the steel roll adhering to the surface of the grinding wheel during the grinding process,
The surface of the electrode facing the grinding wheel is composed of a thin metal plate having a plurality of fine grinding liquid supply holes, and the portion other than the surface facing the grinding wheel is hollow with an insulating material. ,
a grinding liquid supply step of supplying the grinding liquid to the gap through the interior of the electrode and the grinding liquid supply hole ;
When the electrode is used as the first electrode, a second electrode that is the same electrode as the first electrode is provided as a second electrode at a position different from the first electrode so as to face the grinding wheel with a gap. an installation process;
a power supply switching step of switching power supply to the grinding wheel to power supply to the second electrode;
Electrolytic dressing method.

Images