CN118401344A

CN118401344A - Electrolytic dressing device and electrolytic dressing method suitable for cylindrical grinding of steel roller

Info

Publication number: CN118401344A
Application number: CN202280083074.9A
Authority: CN
Inventors: 田中雄大; 梁井和博; 铃木孝; 三木保男; 岩田太地; 藤原晶彦
Original assignee: Xinte Co ltd
Current assignee: Xinte Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2024-07-26
Also published as: WO2024003977A1; TWI837030B; JPWO2024003977A1; JP7157990B1; TW202400331A

Abstract

An electrolytic dressing apparatus and an electrolytic dressing method suitable for cylindrical grinding of steel rolls are provided. An electrolytic dressing apparatus includes: an electrically conductive grinding tool used for grinding a steel roll for rolling; an electrode facing the grinding tool with a gap; and a power supply for supplying power to the grinding tool and the electrode; supplying a conductive grinding fluid to a gap between the grinding tool and the electrode, and electrolyzing and removing grinding powder of the steel roller attached to the surface of the grinding tool during grinding; the surface of the electrode facing the grinding tool is made of a thin metal plate, and the portion of the electrode other than the surface facing the grinding tool is made of an insulating material.

Description

Electrolytic dressing device and electrolytic dressing method suitable for cylindrical grinding of steel roller

Technical Field

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

Background

The steel rolls include cast steel, tool steel (die steel, high-speed steel), and the like. In hot rolling, which rolls a hotter raw material, the raw material is heated and softer due to the high temperature. The purpose of hot rolling is to reduce the sheet thickness by flattening the raw material as much as possible during the high temperature period. Large diameter cast steel rolls are used for hot rolling. After hot rolling, the sheet is formed into a shape of a sheet or a coil, and a thick sheet product is formed. The rolling for forming the hot-rolled thick plate product into a thin plate or strip product is cold rolling. The sheet, roll has been cooled to room temperature. The raw material is high in strength at room temperature as compared with high temperature, and the force required for rolling is also large. The rolls used in cold rolling are made of higher strength steel that is not weaker than the strength of the raw material. Therefore, high alloy tool steels such as die steels and high-speed steels are also used. By providing a high alloy, the roll is provided with higher strength and higher toughness, and rolling of a high-strength material can be performed. In particular, cold-rolled steel strips such as high-strength stainless steel are used for springs and the like, and are typically high-hardness materials. High-speed steel rolls of high alloy are suitable for cold rolling, but periodically regrinding is required for repeated cold rolling. However, since high-speed steel has high strength and toughness, it is difficult to grind it again.

If the sheet or strip material is rolled by steel rolls, marks remain on the surfaces of the material in contact with the rolls. If the mark is left as it is, a defect occurs in the shape of the material to be rolled, and the material becomes defective. Thus, the rolls are periodically regrind. However, die steel and high-speed steel have high strength and toughness, and therefore, they tend to cause clogging due to the adhesion of roll grinding powder to the surface of the grinding tool, and grinding becomes difficult. Thus, there is a problem in that a long time is required for grinding 1 roller. If the grindability is poor, the grinding efficiency is lowered, and as a result, the production efficiency of the plate and the belt is also lowered. In particular, high-speed steel having a larger number of alloy elements and a larger addition amount than die steel is often used for rolling when manufacturing thin sheets or strips of stainless steel having a high strength as a raw material. If the rolling is performed by a high-speed steel roll, the surface properties of the rolled sheet or strip are good, and an attractive appearance can be obtained. However, since the high-speed steel roll has poor grindability as described above, the frequency of use is lower than that of die steel, and this is a problem in the popularization of high-speed steel rolls. The improvement of the process of regrinding the rolls also brings about an improvement in the quality of the metal sheet and strip products.

As a technique for improving the grindability, there is a technique for electrolytically dressing the surface of an abrasive tool simultaneously with (during) grinding. Fig. 7 shows a typical structure of a conventional electrolytic dressing apparatus. Further, for example, there is also a technique disclosed in patent document 1. The grinding device disclosed in patent document 1 includes: grinding tool for grinding the workpiece; an electrode for electrolytic dressing, the electrode surface and the grinding surface of the grinding tool are opposite to each other with a gap between them; and a power supply for energizing the grinding tool and the electrolytic dressing electrode by sandwiching the grinding fluid; the workpiece is ground while the surface of the grinding tool is electrolytically dressed. However, the conventional technique disclosed in patent document 1 is to electrolytically dress the grinding tool itself, and not to remove the grinding powder adhering to the surface of the grinding tool by electrolysis.

In addition, since the electrode used in the conventional electrolytic trimming device shown in fig. 7 is a block made of metal, the electrode has a weight, and therefore, the manufacturing property, the portability and the installability are poor, and high cost is required.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-234474

Disclosure of Invention

Problems to be solved by the invention

It is therefore an object of the present invention to provide an electrolytic dressing apparatus and an electrolytic dressing method suitable for cylindrical grinding of steel rolls.

Means for solving the problems

In order to solve the above problems, an electrolytic dressing apparatus according to the present invention includes: an electrically conductive grinding tool used for grinding a steel roll for rolling; an electrode facing the grinding tool with a gap; and a power supply for supplying power to the grinding tool and the electrode; supplying a conductive grinding fluid to a gap between the grinding tool and the electrode, and electrolyzing and removing grinding powder of the steel roller attached to the surface of the grinding tool during grinding; the surface of the electrode facing the grinding tool is made of a thin metal plate, and the portion of the electrode other than the surface facing the grinding tool is made of an insulating material.

The electrode may be hollow in its interior; the thin plate is provided with a plurality of tiny grinding fluid supply holes; the grinding fluid is supplied to the gap through the inside of the electrode and the grinding fluid supply hole.

The inside of the electrode may be partitioned by at least one partition wall; the grinding fluid supply hole is formed such that the aperture is different between the grinding fluid supply hole corresponding to the inside of the electrode divided into large portions by the partition wall and the grinding fluid supply hole corresponding to the inside of the electrode divided into small portions by the partition wall.

When the electrode is the 1 st electrode, the electrode may be provided as the 2 nd electrode at a position different from the 1 st electrode so as to face the grinding tool with a gap therebetween; the power supply supplies power to the 2 nd electrode instead of the grinding tool.

The electrode of one of the electrodes may be disposed vertically above the grinding tool.

The electrode of one side may be provided vertically below the grinding tool.

The motor may further include a bearing, wherein an outer ring of the bearing is electrically connected to a power supply via a power supply line, and the bearing has conductivity; a bearing capable of being electrically fixed to the shaft of the grinding tool; the abrasive article is powered from a power source via the bearing.

The bonding material of the abrasive tool may be a metal resin bonding material to which electrification is imparted by containing metal fibers in the resin bonding material.

The abrasive article may be an abrasive article numbered #400 to # 2000.

The abrasive grains of the abrasive tool may be CBN abrasive grains.

The sheet may have a circular arc length exceeding 15% of the circumference of the grinding tool.

In the electrolytic dressing method according to the present invention, the conductive grinding fluid is supplied to the gap between the conductive grinding tool used for grinding the steel roll for rolling and the electrode facing the grinding tool with the gap therebetween, and the grinding powder of the steel roll attached to the surface of the grinding tool during grinding is electrolytically removed by supplying power to the grinding tool and the electrode from the power source; the surface of the electrode facing the grinding tool is made of a metal sheet having a plurality of minute grinding fluid supply holes, and the portion of the electrode other than the surface facing the grinding tool is made of an insulating material to be hollow; the method includes a grinding fluid supply step of supplying the grinding fluid to the gap through the inside of the electrode and the grinding fluid supply hole.

The present invention may further include: a2 nd electrode setting step of setting, when the electrode is the 1 st electrode, the same electrode as the 1 st electrode as the 2 nd electrode at a position different from the 1 st electrode so as to face the grinding tool with a gap therebetween; and a power supply switching step of switching power supply to the grinding tool to power supply to the 2 nd electrode.

The present invention may further include: a power supply bearing preparation step of preparing a bearing, wherein an outer ring of the bearing is electrically connected to a power supply via a power supply line, and the bearing has conductivity; and a bearing installation step for electricity supply, wherein the bearing is installed on the shaft of the grinding tool in an energizable manner; the abrasive article is powered from a power source via the bearing.

Effects of the invention

According to the present invention, it is possible to provide an electrolytic dressing apparatus and an electrolytic dressing method suitable for cylindrical grinding of steel rolls.

Drawings

Fig. 1 is a diagram showing a structure of an electrolytic dressing apparatus according to a first embodiment of the present invention.

Fig. 2A is a view (front view) showing an electrode according to a first embodiment of the present invention.

Fig. 2B is a view (side view) showing an electrode according to a first embodiment of the present invention.

Fig. 2C is a view (A-A cross-sectional view) showing an electrode according to a first embodiment of the present invention.

Fig. 3A is a view (side view) showing an accessory according to the first embodiment of the present invention.

Fig. 3B is a view (front view) showing an accessory according to the first embodiment of the present invention.

Fig. 4 is a diagram showing a structure of an electrolytic dressing apparatus according to a second embodiment of the present invention.

Fig. 5A is a view (front view) showing an electrode according to a second embodiment of the present invention.

Fig. 5B is a view (side view) showing an electrode according to a second embodiment of the present invention.

Fig. 5C is a view (cross-sectional view along line B-B) showing an electrode according to a second embodiment of the present invention.

Fig. 5D is a diagram (cross-sectional view along line B-B) showing a modification of the electrode according to the second embodiment of the present invention.

Fig. 6A is a diagram showing a structure of an electrolytic trimming device according to a third embodiment of the present invention.

Fig. 6B is a diagram showing a configuration of a modification of the electrolytic trimming device according to the third embodiment of the present invention.

Fig. 7 is a diagram showing an example of the structure of a conventional electrolytic dressing apparatus.

Detailed Description

The electrolytic dressing apparatus and the electrolytic dressing method according to the present invention will be described below. In addition, the same reference numerals are used for the same or equivalent elements in the drawings.

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

Fig. 1 is a diagram showing a configuration of an electrolytic trimming device 100 according to a first embodiment of the present invention. The electrolytic dressing apparatus 100 includes a grinding tool 102, an electrode 103, and a power source 104. In addition, reference numeral 101 is a steel roll for rolling. Reference numeral 105 denotes a grinding fluid supply source (tank), and reference numeral 106 denotes a nozzle for discharging a grinding fluid 107, and is connected to the grinding fluid supply source (tank) via a pipe (hose).

The grinding tool 102 is a columnar conductive grinding tool used for grinding the steel roller 101, and is rotationally driven by a rotary shaft supported by a device such as a cylinder grinder, not shown. As the bonding material of the grinding tool 102, various existing materials can be used, but the metal bonding material is hard, and therefore, the metal bonding material bounces back against the steel roller 101, and there is a case where a defect such as a knocked mark is generated on the surface of the steel roller 101. Therefore, as the bonding material of the grinding tool 102, a metal resin bonding material to which a metal fiber is added to impart electrical conductivity (conductivity) is preferable. The number of the grinding tool 102 may be any number as long as it is available, but the applicant of the present application has paid attention to experiments, and as a result, has obtained the knowledge that the range of #200 to #4000, and if further defined, the range of #400 to #2000 is preferable. The number (particle size) described in the present specification complies with or is in accordance with JIS R6001-1: 2017 (particle size of grinding material for grinding tool-part 1: coarse particle) and JIS R6001-2: 2017 (particle size of grinding material for grinding tool-part 2: fine powder), and expressions generally used in the industry of manufacturing and selling grinding tools. The present applicant focused on experiments to obtain CBN (cubic boron nitride) as a preferable knowledge, although various conventional abrasive grains can be used as the abrasive grains of the abrasive tool 102.

The electrode 103 is an electrode for electrolytically removing the grinding powder of the steel roller 101 attached to the surface of the grinding tool 102. The electrode 103 is shown as a block, and includes an electrode surface having an arc-shaped cross section. The electrode surface is rectangular and long, facing the outer peripheral surface of the grinding tool 102, and is formed in a cylindrical inner peripheral surface shape so as to form a gap, for example, a gap of about 0.5mm to 7.0mm, between the electrode surface and the outer peripheral surface of the grinding tool 102, which allows the insertion of the conductive grinding fluid. In fig. 1, the electrode 103 is shown as being disposed so as to be arranged beside the grinding tool 102, but the position where the electrode 103 is disposed is not limited to this.

Here, the electrode 103 will be further described with reference to fig. 2A to 2C. Fig. 2A is a front view of the electrode 103, fig. 2B is a side view of the electrode 103, and fig. 2C is a sectional view taken along line A-A of the electrode 103. As shown in the figure, the electrode surface of the electrode 103 facing the grinding tool 102, that is, the electrode surface having an arc-shaped cross section, is formed of a thin metal plate 201. The portion of the electrode 103 other than the surface facing the grinding tool 102 is made of an insulating material 200. As a specific material of the thin plate 201, various metals such as titanium and copper can be used. The width of the sheet 201 (width in the lateral direction in fig. 2B) is preferably the same as or greater than the width of the grinding tool 102. As a specific material of the insulating material 200, various plastics such as vinyl chloride and polycarbonate can be used. By configuring the electrode 103 as described above, the electrode can be made significantly lighter than conventional electrodes made entirely of metal, and can be manufactured, transported, installed, and cost reduced. The size of the electrode surface is not particularly limited, but the applicant of the present application has paid attention to experiments and, as a result, has obtained the following findings: good results are obtained when the circumferential length of the electrode surface, i.e., the circular arc length of the sheet 201 exceeds 15% of the circumferential length (outer circumference) of the grinder 102 (i.e., the ratio of the sheet 201 covering the grinder 102 in the circumferential direction exceeds 15%).

The power source 104 is a power source that supplies (supplies) appropriate voltages and currents to the grinding tool 102 and the electrode 103 according to the grinding conditions. As the power source 104, various power sources such as a dc power source, a dc pulse power source, an ac power source, and a bipolar amplifier can be applied. In the present embodiment, the electrode 103 (sheet 201) is supplied with power via a power supply line (wiring) 108, and the grinding tool 102 is supplied with power via a power supply line (wiring) 109. In addition, although the power may be supplied to the grinder 102 via a brush provided at the tip of the power supply line 109, if the power is supplied via an accessory 107 (bearing 301) for power supply, which will be described later, the power supply can be performed more stably.

Next, the accessory 107 capable of stably supplying power to the grinding tool 102 will be described with reference to fig. 3A and 3B. Fig. 3A is a side view of accessory 107, and fig. 3B is a front view of accessory 107. As shown in the figure, the attachment 107 includes a bearing 301 as a main component, and a sleeve 300 that accommodates the bearing 301 therein. Sleeve 300 may be omitted as appropriate. The bearing 301 has conductivity (electrical conductivity) and is fixed to a shaft (rotation shaft) of the grinding tool 102 so as to be able to be energized. The conductivity (electroconductivity) of the bearing 301 is provided by using, for example, an electroconductive (electroconductivity) grease when the bearing 301 is assembled. The bearing 301 is electrically connected to the power supply 104 by fixing the power supply line (wiring) 109 to the outer ring. The method of fixing the power feeding line (wire) 109 to the outer ring is not particularly limited, and for example, a method of inserting and fixing the power feeding line (wire) 109 into a hole as shown by reference numeral 302, and a method of directly fixing the power feeding line (wire) to the outer ring by soldering may be applied. By providing the power supply to the grinding tool 102 via the bearing 301, stable power supply can be performed as compared with power supply by brushes that consume with use. In addition, the effect of reducing the waste parts can be obtained.

The operation of the electrolytic trimming device 100 described above will be described. First, the electrode 103 is fixed to the conductive grinding tool 102 used for grinding the steel roller 101 so as to face the conductive grinding tool with a gap between the conductive grinding fluid and the conductive grinding fluid interposed therebetween. Next, the grinding fluid is supplied from the nozzle 106 to the gap between the grinding tool 102 and the electrode 103, and the power is supplied from the power source 104 to the grinding tool 102 and the electrode 103. As a result, the grinding powder adhering to the steel roller 101 on the surface of the grinding tool 102 during grinding is continuously electrolytically removed (electrolytic dressing), and the grinding performance can be improved while maintaining the contact state between the abrasive grains of the grinding tool 102 and the steel roller 101. In addition, a conductive (electrically conductive) bearing 301 is prepared, the outer ring of the bearing 301 is electrically connected to the power source 104 via a power supply line (wiring) 109, the bearing 301 is provided on the shaft of the grinding tool 102 so as to be electrically conductive, and if the grinding tool 102 is supplied with power from the power source 104 via the bearing 301, stable power supply is enabled.

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

Fig. 4 is a diagram showing a configuration of an electrolytic trimming device 400 according to a second embodiment of the present invention. The electrolytic dressing apparatus 400 includes the grinding tool 102, the electrode 401, and the power source 104. The steel roller 101, the grinding tool 102, the power source 104, the grinding fluid supply source (tank) 105, the attachment 107, the power supply line (wiring) 108, and the power supply line (wiring) 109 are the same as those of the first embodiment.

The electrode 401 is an electrode for electrolytically removing the grinding powder of the steel roller 101 attached to the surface of the grinding tool 102. The electrode 401 is shown in a block shape, and includes an electrode surface having an arc-shaped cross section. The electrode surface is rectangular and long, facing the outer peripheral surface of the grinding tool 102, and is formed in a cylindrical inner peripheral surface shape so as to form a gap, for example, a gap of about 0.5mm to 7.0mm, between the electrode surface and the outer peripheral surface of the grinding tool 102, which allows the insertion of the conductive grinding fluid. In fig. 4, the electrode 401 is shown as being disposed so as to be arranged beside the grinding tool 102, but the position where the electrode 401 is disposed is not limited to this.

Next, the electrode 401 will be further described with reference to fig. 5A to 5C. Fig. 5A is a front view of the electrode 401, fig. 5B is a side view of the electrode 401, and fig. 5C is a B-B sectional view of the electrode 401. As shown in the figure, the electrode 401 has a metal thin plate 502 as an electrode surface having an arc-shaped cross section, which is a surface facing the grinding tool 102. The portion of the electrode 401 other than the surface facing the grinding tool 102 is made of an insulating material 500. As a specific material of the thin plate 502, various metals such as titanium and copper can be used. The width of the sheet 502 (width in the lateral direction in fig. 5B) is preferably the same as or greater than the width of the abrasive article 102. As a specific material of the insulating material 500, various plastics such as vinyl chloride and polycarbonate can be used. By configuring the electrode 401 as described above, the electrode can be made significantly lighter than conventional electrodes made entirely of metal, and can be manufactured, transported, installed, and cost reduced. The size of the electrode surface is not particularly limited, but the applicant of the present application has paid attention to experiments and, as a result, has obtained the following findings: good results are obtained when the circumferential length of the electrode surface, i.e., the circular arc length of the sheet 201 exceeds 15% of the circumferential length (outer circumference) of the grinder 102 (i.e., the ratio of the coverage of the grinder 102 by the sheet 502 in the circumferential direction exceeds 15%).

The electrode 401 is different from the electrode 103 according to the first embodiment in that the interior thereof is hollow, at least one grinding fluid inlet 402 is provided in the insulating material 500, and a plurality of minute grinding fluid supply holes 503 are provided in the thin plate 502. The grinding fluid inlet 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 pipe (hose). The grinding fluid inlet 501 is provided on the front surface of the electrode 401, but may be provided on other surfaces 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 tool 102 and the electrode 401 through the inside 504 of the electrode 401 and the grinding fluid supply hole 503 (grinding fluid supply step). This eliminates local unevenness in the flow of the grinding fluid 107 on the electrode surface, and can maintain the surface quality of the grinding tool 102 constant. When the electrode 401 is provided at the position shown in fig. 4, the lower the grinding fluid supply hole 503 is, the smaller the aperture (the higher the grinding fluid supply hole 503 is, the larger the aperture is). By making the aperture smaller as the grinding fluid supply hole 503 is located below, the unevenness in the supply of the grinding fluid from below to above can be eliminated.

The electrode 401 may be in the form shown in fig. 5D. That is, at least one partition 505 dividing the interior 504 may 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 improved, and the grinding fluid introduced from the grinding fluid introduction port 501 can be distributed in good balance in the interior 504 of the electrode 401. When the inner portion 504 of the electrode 401 is divided into different sizes (volumes) by the partition wall 505, the aperture of the grinding fluid supply hole 503 may be set to be different in size between the grinding fluid supply hole 503 (503L) corresponding to the inner portion 504 (504L) divided into large portions by the partition wall 505 and the grinding fluid supply hole 503 (503S) corresponding to the inner portion 504 (504S) divided into small portions by the partition wall 505. For example, the grinding fluid supply hole 503 (503L) corresponding to the large inner portion 504 (504L) divided by the partition wall 505 may be formed to have a small aperture, and the grinding fluid supply hole 503 (503S) corresponding to the small inner portion 504 (504S) divided by the partition wall 505 may be formed to have a large aperture. The opposite may also be true. By setting the diameters of the grinding fluid supply holes 503 to be different in size between the grinding fluid supply holes 503 (503L) corresponding to the large-divided inner portions 504 (504L) by the partition wall 505 and the grinding fluid supply holes 503 (503S) corresponding to the small-divided inner portions 504 (504S) by the partition wall 505 according to the conditions such as the position, orientation, angle, and viscosity of the grinding fluid in which the electrodes 401 are disposed, it is possible to eliminate the uneven supply of the grinding fluid to the gap between the grinding tool 102 and the electrodes 401.

According to the electrolytic dressing apparatus 400 according to the second embodiment of the present invention described above, the grinding powder adhering to the steel roller 101 on the surface of the grinding tool 102 during grinding is continuously electrolytically removed (electrolytic dressing), and the state in which the abrasive grains of the grinding tool 102 are in contact with the steel roller 101 can be maintained, and the grindability can be improved. In addition, as in the electrolytic dressing apparatus 100 according to the first embodiment of the present invention, a conductive (electrically conductive) bearing 301 is prepared, the outer ring of the bearing 301 is electrically connected to the power source 104 via the power supply line (wiring) 109, the bearing 301 is provided on the shaft of the grinding tool 102 so as to be electrically conductive, and if the power is supplied from the power source 104 to the grinding tool 102 via the bearing 301, stable power supply is enabled.

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

Fig. 6A is a diagram showing a structure of an electrolytic trimming device 600 according to a third embodiment of the present invention. The electrolytic dressing apparatus 600 includes the grinding tool 102, the electrode 401, the electrode 601, and the power source 104. The electrode 401 is the same as in the first embodiment. The steel roller 101, the grinding tool 102, the power source 104, the grinding fluid supply source (tank) 105, and the power supply line (wiring) 108 are similar to those of the first embodiment.

The electrode 401 is an electrode (1 st electrode) for electrolytically removing the grinding powder of the steel roller 101 attached to the surface of the grinding tool 102. The structure of the electrode 401 is the same as that of the second embodiment. In fig. 6A, the electrode 401 is shown as being disposed so as to be arranged beside the grinding tool 102, but the position where the electrode 401 is disposed is not limited thereto. In the present embodiment, the electrode 401 according to the second embodiment is the 1 st electrode, but the 1 st electrode may be the electrode 103 according to the first embodiment.

The electrode 601 is an electrode (2 nd electrode) having the same structure as the electrode 401 as the 1 st electrode. The electrode 601 as the 2 nd electrode is provided at a position different from the electrode 401 as the 1 st electrode so as to face the grinding tool 102 with a gap therebetween (2 nd electrode providing step). In fig. 6A, the electrode 601 is shown as being disposed vertically below the grinding tool 102, but the location where the electrode 601 is disposed is not limited to this.

In the electrolytic dressing apparatus 600 according to the third embodiment of the present invention, the power source 104 supplies power to the electrode 601 (the 2 nd electrode) via the power supply line (wiring) 109 instead of the grinding tool 102 (power supply switching step).

According to the electrolytic dressing apparatus 600 according to the third embodiment of the present invention described above, the grinding powder adhering to the steel roller 101 on the surface of the grinding tool 102 during grinding is continuously electrolytically removed (electrolytic dressing), and the state in which the abrasive grains of the grinding tool 102 are in contact with the steel roller 101 can be maintained, and the grindability is improved. Further, by setting the power supply destination from the power source 104 to the electrode 401 (1 st electrode) and the electrode 601 (2 nd electrode), direct power supply from the brush to the rotation-driven grinding tool 102 and power supply via the bearing 301 are not required.

Here, the positions of the electrode 401 (1 st electrode) and the electrode 601 (2 nd electrode) are not particularly limited, but if one electrode is disposed vertically below the grinder 102, the space around the grinder 102 is not pressed, and the electrode can be easily disposed by simply placing the electrode. In addition, if one of the electrodes is provided vertically above the grinding tool 102 as in the modification shown in fig. 6B, grinding fluid can be supplied efficiently to the gap between the grinding tool 102 and the electrode by gravity, in other words, as in the shower.

While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, a thin groove through which the grinding fluid can flow may be formed in the electrode surface, so that the grinding fluid supplied from the grinding fluid supply hole 503 is spread over the entire electrode surface along the groove. Thereby, the uniformity of the supply of the grinding fluid to the gap between the grinding tool and the electrode is further improved.

According to the electrolytic dressing apparatus and the electrolytic dressing method of the present invention, the frequency of use of the high-speed steel roll is increased, and the difficulty in manufacturing the sheet and the strip having the high-function surface is reduced. The electrolytic dressing apparatus and the electrolytic dressing method according to the present invention can be applied to high-function rolls (e.g., super hard rolls and ceramic rolls) other than tool steel. Further, according to the electrolytic dressing apparatus and the electrolytic dressing method of the present invention, in addition to improvement of the surface quality in the field where the high-hardness and high-toughness material such as stainless steel is cold-rolled, the possibility of cold-rolling the high-hardness and high-toughness material other than stainless steel is increased, and the use of the high-hardness and high-toughness material other than stainless steel is increased. Further, according to the electrolytic dressing apparatus and the electrolytic dressing method of the present invention, there is a possibility that a material (for example, a superalloy) having higher strength and higher toughness than steel is used as a material for a hot roll.

Description of the reference numerals

100. Electrolytic dressing device

101. Steel roller

102. Grinding tool

103 Electrode (1 st electrode)

104 Power supply

105 Grinding fluid supply source (box)

106. Nozzle

107. Accessory

108 Power supply line (Wiring)

109 Feeder (Wiring)

200. Insulating material

201. Sheet metal

300. Sleeve barrel

301. Bearing

302. Hole(s)

400. Electrolytic dressing device

401 Electrode (electrode 1)

500. Insulating material

501. Grinding fluid inlet

502. Sheet metal

503. Grinding fluid supply hole

503L grinding fluid supply hole

503S grinding fluid supply hole

504 Inner part (inner space)

504L inner part (inner space)

504S inside (inner space)

505. Partition wall

600. Electrolytic dressing device

601 Electrode (No. 2 electrode)

700. Electrolytic dressing device

701. Electrode

702. DC power supply

703 Feeder (Wiring)

704 Feeder (Wiring)

Claims

1. An electrolytic dressing apparatus includes:

An electrically conductive grinding tool used for grinding a steel roll for rolling;

an electrode facing the grinding tool with a gap; and

A power supply for supplying power to the grinding tool and the electrode;

supplying a conductive grinding fluid to the gap between the grinding tool and the electrode, and electrolytically removing the grinding powder of the steel roller attached to the surface of the grinding tool during the grinding process;

It is characterized in that the method comprises the steps of,

The surface of the electrode facing the grinding tool is made of a thin metal plate, and the portion of the electrode other than the surface facing the grinding tool is made of an insulating material.

2. The electrolytic trimming device according to claim 1, wherein,

The electrode is hollow;

The thin plate is provided with a plurality of tiny grinding fluid supply holes;

The grinding fluid is supplied to the gap through the inside of the electrode and the grinding fluid supply hole.

3. The electrolytic trimming device according to claim 2, wherein,

The interior of the electrode is divided by at least one partition wall;

The grinding fluid supply hole is formed such that the aperture is different between a grinding fluid supply hole corresponding to the inside of the electrode divided by the partition wall to be large and a grinding fluid supply hole corresponding to the inside of the electrode divided by the partition wall to be small.

4. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

When the electrode is the 1 st electrode, the electrode is provided as the 2 nd electrode at a position different from the 1 st electrode so as to face the grinding tool with a gap therebetween;

the power supply supplies power to the 2 nd electrode instead of the grinding tool.

5. The electrolytic trimming device according to claim 4, wherein,

One electrode is provided vertically above the grinding tool.

6. The electrolytic trimming device according to claim 4, wherein,

One electrode is provided vertically below the grinding tool.

7. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

The bearing is further provided with a bearing, wherein an outer ring of the bearing is electrically connected with the power supply through a power supply line, and the bearing has conductivity;

The bearing is fixed on the shaft of the grinding tool in an electrified manner;

the grinding tool is supplied with power from the power supply via the bearing.

8. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

The bonding material of the grinding tool is a metal resin bonding material which is provided with electrification by containing metal fibers.

9. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

The foregoing abrasive articles are abrasive articles numbered #400 to # 2000.

10. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

The abrasive grain of the grinding tool is CBN abrasive grain.

11. The electrolytic dressing apparatus according to claim 1 to 3, wherein,

The sheet has a circular arc length exceeding 15% of the circumferential length of the grinding tool.

12. An electrolytic dressing method for supplying a conductive grinding fluid to a gap between a conductive grinding tool used in grinding of a steel roll for rolling and an electrode facing the grinding tool with the gap therebetween, supplying power to the grinding tool and the electrode from a power source, and electrolytically removing grinding powder of the steel roll attached to the surface of the grinding tool during the grinding,

The surface of the electrode facing the grinding tool is made of a metal thin plate provided with a plurality of tiny grinding fluid supply holes, and the part of the electrode other than the surface facing the grinding tool is made of an insulating material and is hollow;

and a grinding fluid supply step of supplying the grinding fluid to the gap through the inside of the electrode and the grinding fluid supply hole.

13. The electrolytic dressing method according to claim 12, wherein,

The device further comprises:

A2 nd electrode setting step of setting, when the electrode is the 1 st electrode, the same electrode as the 1 st electrode as the 2 nd electrode at a position different from the 1 st electrode so as to face the grinding tool with a gap therebetween; and

And a power supply switching step of switching power supply to the grinder to power supply to the 2 nd electrode.

14. The electrolytic dressing method according to claim 12, wherein,

The device further comprises:

a power supply bearing preparation step of preparing a bearing, wherein an outer ring of the bearing is electrically connected to the power supply via a power supply line, and the bearing has conductivity; and

A bearing installation step for installing the bearing on the shaft of the grinding tool so as to be capable of being energized;

the grinding tool is supplied with power from the power supply via the bearing.