JPH09108714A - Rolling roll and its manufacture; rolling mill and rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the shaft runout of a roll, to improve working precision and to contrive the large expansion of a rolling distance in the transfer of characters and patterns. SOLUTION: A projected part 5 is formed on both ends of a ceramic roll 1; an SUS pipe is wound as a cushioning material 4 preliminarily in the shape of a coil spring corresponding to the diameter of the projected part 5; a recessed part center hole 3 and a through-hole 7 are provided which are slightly smaller than the wound diameter of the SUS pipe; a quenched, tempered die-steel made metallic cap 2 having a Rockwell hardness of 55 is heated to about 800 deg.C for thermal expansion so that it is fitted over the SUS pipe and fixed. As a result, galling or wear is hard to be produced in the center part of the roll at the time of surface grinding, thereby causing little shaft runout of the roll and resulting in the improvement of working precision such as circuiarity and cylindricity. In addition, as a rolling stock, it is desirable to have a smooth surface free of anisotropy and plural areas with different surface roughness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing apparatus and method for a circular member such as a novel ceramic roll for rolling, a metal composite roll, and a super hard roll, a circular member and a material to be rolled.

[0002]

2. Description of the Prior Art Conventional circular member polishing apparatuses are roughly classified into the following three types. One is lathe processing using a cutting tool whose main purpose is grinding. The second is cylindrical grinding and cylindrical polishing using a rotating grindstone (Japanese Patent Laid-Open No. 61-7195).
No. 3, JP-A-1-199705, JP-A No. 4-274808
No.).

In a conventional ceramic roll for a rolling mill, the entire roll is made of ceramics, and sufficient consideration has not been given to the center hole and its fixing during grinding of the roll (Japanese Patent Publication No. 4-48524). Publication, Japanese Patent Publication No.4-2844
2 and JP-A-4-361803).

[0004]

In each of the above prior arts, the play accuracy and the vibration of the polishing apparatus reduce the processing accuracy,
In particular, the roundness has been reduced and processing marks such as feed marks have been generated. Here, the circularity refers to the difference between the outermost diameter and the minimum diameter of the circular outer surface of the circular member, and the smaller the smaller, the better the circularity. That is, when the roundness is excellent, the circumferential undulation of the outer surface is small. In the polishing of a circular member by the most commonly used rotary grindstone, since both the object to be polished and the axis of the rotary grindstone are fixed, the wobble of the grindstone due to imperfect dynamic balance of the rotary grindstone, the spindle and the grindstone. The looseness of the shaft bearing and the looseness of the slide table deteriorate the roundness, and also cause a scratch such as a hit or a machining mark such as a feed mark.

Particularly, when the object to be polished becomes hard, the polishing surface pressure becomes high, and the above-mentioned defective phenomenon tends to increase. In addition, when polishing a circular member with a rotating grindstone,
If the polishing time is long, the cutting of the grindstone becomes worse or uneven wear of the grindstone occurs, so that a processing scratch due to galling or the like has been generated. Therefore, the workability is lowered, such that the grindstone is sharpened every predetermined time, and only a skilled worker processes it. For example, in the conventional polishing using a rotary grindstone, the roundness is about 1 to 2 μm, and it is difficult to completely remove the feed marks, the scratches, and the like.

[0006] In the above-mentioned prior art, no consideration was given to a grinding process of a ceramic roll having no anisotropy.

The object of the present invention is to prevent backlash and vibration of a polishing apparatus,
In addition, it essentially improves the deterioration of processing accuracy due to the deterioration of the sharpness of the grindstone, etc., and has excellent roundness, that is, the waviness in the circumferential direction of the outer surface of the circular member is small, and the processing marks and anisotropy of the feed marks are reduced Another object of the present invention is to provide a ceramic roll capable of simultaneously printing a three-dimensional decorative pattern or geometric pattern on a rolled steel sheet, a method for producing the same, and a rolling machine using the same.

[0008]

The present invention has a smooth region and a roughened region, and the smooth region is anisotropic in at least one of surface roughness, waviness and light reflectance. Or a plurality of regions having different surface roughnesses are provided.

The roll member described above is preferably a ceramic member or a super hard member, and it is preferable that the plurality of regions having different roughenings or surface roughnesses are at least one of a picture, a character, a decorative pattern, a geometric pattern and a figure. .

The present invention resides in a method for producing a rolling roll characterized by forming a plurality of regions having different surface roughness on a surface having a smooth surface.

The present invention comprises a step of forming a smooth surface having no anisotropy in at least one of surface roughness, waviness and light reflectance, and a plurality of roughening or different surface roughness on the smooth surface. The method for manufacturing a rolling roll is characterized in that

The present invention is characterized by having a smooth surface having no anisotropy in at least one of surface roughness, waviness, and light reflectance, and a plurality of regions having different roughenings or surface roughnesses. It is in the material to be rolled.

The material to be rolled is ferritic stainless steel, austenitic stainless steel, copper, aluminum, Ni.
It is preferably any one of a base alloy, a plated steel sheet of aluminum or zinc or tin, a resin coated steel sheet having a thickness of 1 mm or less, and a foil of 0.01 to 0.2 mm.

The present invention is directed to a rolling mill in which a work roll is driven by rotation of a pair of intermediate rolls that are reinforced with a reinforcement roll or a reinforcement bearing as a back, and the work roll is a ceramic roll or an ultra roll. The roll is a hard roll, and the roll has a smooth region and a plurality of regions having different roughenings or surface roughnesses on the body surface, and is provided by a roller provided in contact with the end face or a support bearing that rotates in synchronization with the roll. The rolling mill is characterized in that movement of the roll in the axial direction is prevented.

A ceramic roll or a cemented carbide roll for a rolling mill according to the present invention has a center hole at its end, a metal cap is provided on the end face, and a metal having a hard metal layer having a hardness higher than that of its main body. Those provided with a cap are preferable.

The end portion of the ceramic roll and the metal cap have a cap of 0.05 to 0.3 mm, and the cap is filled with an adhesive and bonded, or the convex portion of the ceramic roll has a metal cushioning material. And the metal caps are joined by shrink fitting.

The ceramic roll has a roughened surface, or a pattern is formed by a mirror surface portion having a roughness Ra of 0.07 μm or less and a rough surface portion having a roughness Ra of 0.1 to 1 μm. It is formed.

The present invention is directed to a rolling mill in which a work roll is driven by rotation of a pair of intermediate rolls which are reinforced with a reinforcement roll or a reinforcement bearing as a back, so that the work roll is a ceramic roll or a cemented carbide roll. The roll is a roll, and the roll which is provided in contact with the end surface or a support bearing which rotates in synchronization with the roll is used to prevent the roll from moving in the axial direction, and the above-mentioned roughened roll is used. .

In particular, a ceramic roll having both ends of an austenitic stainless steel cap main body and a metal cap having a metal layer having a hardness higher than that of the main body material provided on the end faces thereof is adhered or fitted to the ceramic roll. And good.

The roll surface is processed by the shut plast method or the like to form a pattern such as a decorative pattern or a geometric pattern due to the difference in surface roughness. These ceramic rolls can be used as work rolls for rolling mills.

The metal cap preferably has an end surface having a Rockwell C scale hardness (hereinafter referred to as Rockwell hardness) of 40 or more, and in particular, a built-up welding layer having a Rockwell hardness of 50 to 65. It is preferable to provide.

The composition of the overlay welding layer is C: 2.
0-3.0%, Si: 2% or less, Mn: 2% or less, W:
10-12%, Fe: 3% or less, or C: 1.5-2%
, Si: 1.5% or less, Mn: 1.5% or less, Cr: 2
A Co-based alloy containing 0 to 40% and W: 5 to 10% is used.

The center hole is formed in a conical shape, and the center hole may be provided with a through hole. The through hole is important so that air does not remain inside. The through hole may be a straight hole with a small size of 0.5 to 5 mm. This center hole is
A center tool is inserted during cutting and polishing of the roll surface to transmit the rotation, and it is preferable to provide a hole larger than the diameter of the flat conical shape for tool escape on the outer side of the conical shape. It is preferable that the above-mentioned buildup welding layer is also provided inside the conical center hole.

The adhesive for adhering the metallic cap is preferably an epoxy resin, and the cap for the adhesive is preferably 0.05 to 0.3 mm.

In the case of fitting, by interposing a metal cushioning material between the ceramic portion and the cap portion,
The tightening stress from the cap portion can be relieved. Examples of the metal cushioning material include SUS pipe and copper wire.
It is preferable that the stress can be relaxed. The metal cushioning material may have a tubular shape, a ring shape, or a coil spring shape so as to be in close contact with the shaft portion of the ceramic roll. In particular, a pipe-shaped metal buffer material wound in a coil spring shape is preferable.

A shrink fitting method in which the above-mentioned metal cap with a center hole is heated and expanded and fitted into the end portion of the ceramic roll is
It is suitable for preventing the cap from coming off due to heat during the rolling operation of the roll.

Polishing of the roll surface is performed by contacting the inside of the V-shape of a V-shaped pedestal made of ceramic, which is made of ceramic while rotating the roll, and applying an abrasive to the contact surfaces of both of them to obtain a circularity. High polishing is possible. It should be noted that a surface having an arbitrary roughness can be formed by selecting an abrasive.

On the mirror surface polished to have a surface roughness of 0.07 Ra or less, a resist is printed or applied on the non-patterned portion, and the exposed surface is shot-blasted or etched to have a surface roughness of 0.1-0.1. After roughening to 1 μmRa 2, the resist is removed to obtain a patterned roll. Due to the difference in surface roughness, the pattern etc.
A pattern such as a decorative pattern or a geometric pattern can be formed on a rolled material for a long period of time.

Ra of 1 μm or less is preferable because the surface roughening due to the shot blasting or etching as described above affects the strength of the roll if it is rougher than 1 μm.

The ceramic roll is used as a working roll of a compressor, and rolling can be carried out by rotating the working roll by rotating the intermediate roll or the reinforcing roll. At that time, by using a roll provided with the above pattern or the like, the pattern such as the pattern can be easily transferred to the rolled material.

A ceramic roll polishing apparatus according to the present invention comprises a driving device for rotating a columnar or cylindrical object to be polished in a circumferential direction and a pad, preferably a polishing surface, which is pressed against the circumferential surface of the object to be polished. A pad which rotates in parallel, a pressing means for pressing the pad against the object to be polished, and a slurry supply means for supplying a slurry containing an abrasive between the object to be polished and the pad. To do.

The polishing apparatus according to the present invention comprises a driving device for rotating a cylindrical or cylindrical object to be polished in a circumferential direction and reciprocating in parallel to an axial direction, and a circle pressed against a circumferential surface of the object to be polished. A pad that contacts at least two points on the peripheral surface,
A pressing means for pressing the object against the object to be polished, a rotating means for rotating the object in parallel with the polishing surface, and a slurry supply for supplying a slurry containing abrasive grains between the object to be polished and the object to be polished. And means.

It is preferable that the pad can be swung so as to follow the radial movement of the object to be polished and is preferably in contact with the object by rotation.

In the method for polishing a ceramic roll according to the present invention, the polishing abrasive grains are pressed while pressing the pad against the circumferential surface of the cylindrical or cylindrical object to be rotated, preferably the rotating pad. It is characterized in that the slurry containing is supplied between the object to be polished and the pad to polish.

Further, in the polishing method according to the present invention, the rotating pad is pressed and brought into contact with at least two positions on the circumferential surface of the cylindrical or cylindrical object to be reciprocated while rotating and reciprocating parallel to the axial direction. It can move freely in the pressing direction,
A slurry containing abrasive grains is similarly supplied and polished.

The metal caps attached to both ends of the ceramic roll are made of die steel or bearing steel, and
A US material with a hard stellite material on the surface is used. Since the center can be supported by the center hole and grinding can be performed, there is almost no galling with the center or wear of the center, and therefore the accuracy of the shaft is high. There is no decline.

Since the slurry containing the abrasive is passed between the rotating object to be polished and the pad (preferably, the pad to be rotated is good), that is, the abrasive is fixed in a fluid state. However, since the polishing surface of the pad is always kept flat, the polishing material can move in multiple directions with a degree of freedom, and it is difficult for the grinding marks to occur. Therefore, it is possible to prevent the occurrence of polishing scratches in the circumferential direction as seen with the conventional rotary grindstone. Further, the sharpness does not decrease due to the elapse of the polishing time, and a constant sharpness can be maintained at all times, and uneven polishing and scratches due to polishing can be prevented depending on the location. Examples of the type of the abrasive contained in the slurry include SiC, Al ₂ O ₃ , ceramic powder such as silicon carbide, diamond and the like, but any material having a hardness capable of polishing an object to be polished may be used. The particle size is 100 μm or less, preferably 20 μm or less. Water is preferable as a solvent for forming a slurry. A rust preventive dispersant may be added.

Furthermore, since the pad has a structure capable of following the axial displacement due to the rotation of the object to be polished and the vibration generated during the traverse in the axial direction with a constant pressing pressure, the roundness is improved, It is possible to prevent the occurrence of polishing scratches such as feed marks.

Further, by polishing the rolling roll by using the polishing apparatus according to the present invention, since the circumferential undulation of the outer surface is small, the undulation is hardly transferred to the surface of the rolled material. Thus, it is possible to finish the material to be rolled without so-called chatter marks.

[0040] The rolling roll material, sialon composed mainly of Si ₃ N _4, zirconia, SiC, Si ₃ N _4,
Carbide rolls are applied.

The ceramic roll according to the present invention can be used as a sizing roll, and the roll made of silicon nitride can be used as a roll for hot rolling of bar steel at the final finishing.

The polishing apparatus according to the present invention includes a driving device for rotating a cylindrical or cylindrical object to be polished in a circumferential direction, a flexible pad such as a cloth pressed against the circumferential surface of the object to be polished, A pressing means for pressing a pad against the object to be polished, and a slurry supply means for supplying a slurry or a suspension containing abrasive grains between the object to be polished and the pad, the pad is more than the abrasive grains. It is preferable to use a soft material.

Further, the polishing apparatus includes a driving device for rotating a cylindrical or cylindrical object to be polished in the circumferential direction and reciprocating parallel to the axial direction, and a circumferential surface pressed against the circumferential surface of the object to be polished. Between one or more, preferably two, contact points, a pressing means for pressing the object against the object to be polished, and a slurry containing abrasive grains between the object and the object to be polished. And a slurry supply means for supplying the same to the above.

In the above-mentioned polishing apparatus, it is preferable that the pad be in contact with the object to be polished so that the pad can be swung following the radial movement of the object and not rotated. Further, it is preferable that the contact object has a concave surface in contact with the object to be polished. Further, it is preferable that the pad has a structure of contacting at one or more places, preferably two places, on the same circumferential surface of the object to be polished.

In the polishing apparatus, the pressing means includes a holding portion for holding the pad, a support rod for rotatably supporting the holding portion at one end, and a load receiving portion provided at the other end of the support rod. , A fulcrum for supporting the support rod in the middle is preferable. Further, the pressing means preferably includes a holding portion for holding the pad and a biasing means for biasing the holding portion by spring force hydraulic pressure or magnetic force.

In the polishing apparatus, the slurry or suspension supply means preferably allows the slurry or suspension to continuously pass between the polishing object and the pad.

Further, in the polishing method of the present invention, the slurry or suspension containing abrasive grains is pressed against the circumferential surface of a cylindrical or cylindrical object to be polished while pressing a non-rotating object. The surface is roughened after being supplied and polished between the object and the pad.

Further, in the present invention, the flexible pad is brought into contact with and pressed against one or more positions on the circumferential surface of the columnar or cylindrical object to be polished which reciprocates in parallel with the axial direction while rotating, and When the pad is freely movable in the pressing direction according to the radial movement of the object to be polished, and a slurry or suspension containing abrasive grains is supplied between the object to be polished and the object to be polished. After rough polishing is performed by using a rigid member such as ceramic or metal as a pad, then, by polishing a mirror surface using a flexible member such as a buff or cloth on the rigid member as a pad, the surface is roughened. Regions with different degrees are formed multiple times. Here, it is preferred that the abrasive grains are polished with finer abrasive grains in the initial stage of the polishing process. Further, it is preferable that a slurry or suspension containing abrasive grains is continuously passed between the object to be polished and the pad.

The present invention also comprises a ceramic sintered body,
The columnar or cylindrical member is characterized in that the surface roughness is substantially the same in the axial direction and the circumferential direction, and the waviness of the outer surface in the circumferential direction is 0.5 μm or less. Further, the present invention is made of a metal member, and the outer surface has a circumferential waviness of 0.
A columnar or cylindrical member having a thickness of 5 μm or less. Here, it is preferable that the polishing surface has substantially the same polishing surface over the entire length. Further, the ceramic or metal member is preferably a rolling roll. Further, it is preferable that the surface of the roll is random with no direction of grinding marks.

In the present invention, at least one of surface roughness, waviness and reflectance on the smooth surface of the rolled material of the rolled metal has anisotropy particularly in the circumferential direction and the axial direction. However, the waviness is preferably formed to be 0.5 μm or less, and characters, patterns and the like are formed in other portions, which is a material to be rolled.

Further, the present invention relates to a rolling mill in which a work roll is subordinately rotated by rotational driving of an intermediate roll or a reinforcing roll to perform rolling, and the work roll is a long round rod-shaped ceramic or cemented carbide roll as described above. And a plurality of regions having a circumferential waviness of 0.5 μm or less in the smooth portion of the outer surface of the roll and different surface roughness, and bearings are arranged in contact with each end face of the work roll to perform the work. Rolling in which the movement of the work roll in the rolling direction is restrained by restraining the movement of the work roll in the axial direction and disposing support rolls in contact with the work roll before and after the rolling direction of the work roll. It is a machine. Where intermediate roll, reinforcing roll,
A crown may be provided on at least one of the work roll and the support roll.

In the roll of the present invention, it is preferable that the grinding trace has no anisotropy in the circumferential direction and the axial direction and a metal cap having a center hole is provided at the end thereof.

An end material of the ceramic roll and the metal cap are heat-fitted and cold-fitted with an intermediate material put therein, or 0.05
It can be fixed with an adhesive embedded in a ~ 0.3 mm cap. The present invention relates to a rolling mill in which a work roll is subordinately rotated by rotational driving of an intermediate roll or a reinforcing roll, wherein the work roll is the ceramic roll described above, and a metal having a center hole at the end of the roll. It is better to have a cap made.

That is, the metal caps made of a material suitable for the center holes of the die steel and the bearing steel are adhered and fitted to both ends of the ceramic roll.

The metal cap has a Rockwell C scale hardness (hereinafter referred to as Rockwell hardness) of 5
0 or more is desirable, especially Rockwell hardness 50
Tool steels of ˜65 are preferred. The same tool steel as that used for rolling rolls is used as such tool steel, and in particular, quenching and tempering tool steel is preferable.

The composition of the tool steel of the cap material is as follows.
C: 0.5-1.5%, Si: 1% or less, Mn: 1% or less of carbon tool steel, C: 0.5-1.6%, Si: 1% or less,
Mn: 1% or less, Cr: 3-5% or Mo: 3
-10%, W: 3-12%, V: 0.5-5%, the former W: 10-20%, or both: Co: 3-15% high-speed steel , C: 0.2
5-2%, Si: 1.5% or less, Mn: 1.5% or less, C
r: 0.2 to 1% or 1 to 2.5%, Ni: 0.2 to
3%, Mo: 0.2-2%, W: 0.5-10%, V:
An alloy tool steel containing 0.1 to 1.5% of at least one kind is used. These steels are used after being quenched and tempered.

The center hole is provided in a conical shape, and the center hole may be provided with a through hole. The through hole is important so that air is not left inside. The through hole may be a straight hole with a small size of 0.5 to 5 mm. This center hole is
A center tool is inserted during cutting and polishing of the roll surface to transmit the rotation, and it is preferable to provide a hole larger than the diameter of the flat conical shape for tool escape on the outer side of the conical shape.

The adhesive for adhering the metallic cap is preferably an epoxy resin, and the cap for the adhesive is preferably 0.05 to 0.3 mm.

In the case of fitting, by interposing a metal cushioning material between the ceramic portion and the cap portion,
The tightening stress from the cap portion can be relieved. As the metal cushioning material, a material such as a pipe such as SUS304 and 316 or a copper wire capable of relaxing the stress is preferable. The metal cushioning material may have a tubular shape, a ring shape, or a coil spring shape so as to be in close contact with the shaft portion of the ceramic roll. In particular, a pipe-shaped metal buffer material wound in a coil spring shape is preferable.

A shrink fitting method in which the metal cap with a center hole is expanded by heating and fitted into the end of the ceramic roll is
It is suitable for preventing the cap from coming off due to heat during the rolling operation of the roll.

Polishing of the roll surface is carried out by rotating the roll so as to make contact with the inside of the V-shape of the ceramic V-shaped pedestal and applying an abrasive to the contact surfaces of both, and then to form the V-shape. By installing a buff on the die pedestal and performing buff polishing in the same manner as described above, polishing with high roundness can be performed. It should be noted that a surface having an arbitrary roughness can be formed by selecting an abrasive.

Since a slurry or suspension containing abrasive grains is passed between the rotating object to be polished and the pad to polish, that is, since the abrasive grains are in a fluid state and are not fixed, Abrasive grains can move in multiple directions with a degree of freedom, and grinding streaks are less likely to occur. Therefore, it is possible to prevent the occurrence of polishing scratches in the circumferential direction as seen with the conventional rotary grindstone. As the pad, relatively rigid polishing such as metal or ceramic is used, and mirror polishing is performed using a flexible cloth or buff like buffing. Further, the sharpness does not decrease due to the elapse of the polishing time, and a constant sharpness can be maintained at all times, and uneven polishing and scratches due to polishing can be prevented depending on the location. The types of the abrasive grains contained in the slurry or suspension include SiC and Al.
Examples include ceramic powders such as ₂ O ₃ and silicon carbide, diamond, and the like, as long as they have a hardness capable of polishing an object to be polished. The particle size of the abrasive grains is selected according to the desired surface roughness of the object to be polished. Any solvent such as water oil may be used as a solvent for forming a slurry or suspension. A rust preventive agent or a dispersant may be added.

The surface roughness of the polishing surface can be changed as appropriate by changing the grain size and hardness of the polishing abrasive grains used. Further, since the pad is a softer material than the polishing abrasive grains, a concave portion is naturally formed in the initial stage of polishing and is uniformly pressed against the object to be polished, so that polishing scratches due to one-sided contact can be prevented.

Further, since the pad has a structure capable of following the axial displacement due to the rotation of the object to be polished and the vibration generated during the traverse in the axial direction with a constant pressing pressure, the roundness is improved, It is possible to prevent the occurrence of polishing scratches such as feed marks.

Further, since the rolling roll according to the present invention has a small circumferential undulation on the outer surface and has no anisotropy, the undulation is hardly transferred to the surface of the smooth portion of the material to be rolled. It is effective for forming a foil such as Al, Cu, SUS304, 316, etc., which is a rolled material having no so-called chatter marks and anisotropy.

Further, when the rolling roll according to the present invention is used, the surface roughness of the roll surface is substantially the same in the circumferential direction and the axial direction, so that the surface state is uniform and the glossiness has no directionality. The material can be manufactured.

Rolls for rolling include sialon, zirconia, silicon carbide (SiC) alumina and silicon nitride (Si).
₃ N ₄ ) or the like, and is composed of a ceramic roll or a super hard roll sintered to a density of 96% or more, preferably 99.5% or more, relative to the theoretical density.

Particularly as a work roll for rolling of the present invention,
Ceramics and cemented carbide rolls are used, and these rolling bodies are free of hair cracks, micropores, grinding scratches, and foreign substances when visually observed with a microscope of 10 to 50 times. In other words, anisotropic or no grinding striations are formed, or the reflectance of light is substantially the same in the circumferential direction and the axial direction.

The roll of the present invention can be used not only as a work roll but also as a backup roll.

The ceramic roll of the present invention consists of sialon alone or contains sialon as a main component.
It is desirable to make it account for more than weight%.

Other components may include, for example, a sintering aid, a ceramic other than the aforementioned sialon, and the like. These can be included in the form of powder or fibers.
Aluminum nitride, yttria, or the like can be used as the sintering aid. The preferred composition of Sialon is S
i _6-Z Al _Z O _Z N _8- , and Z is preferably 0 to 4.2, particularly preferably 0.1 to 1.

Carbon as a sintering aid is 0.5% by weight.
Even if it is included, the effect is sufficient. Other sintering aids are also sufficiently effective in an amount of 7% by weight or less. Ceramics other than silicon carbide, silicon nitride, sialon, alumina, and zirconia have significantly lower hardness than the above-mentioned ceramics, and the inclusion of these reduces the hardness of the sintered body, resulting in the wear resistance of the roll. Lower.
Therefore, it is desirable not to mix as much as possible, and when it is necessary to mix as a sintering aid or the like, it is desirable to keep the amount to the minimum necessary.

From the above, it is desirable that the sintered body contains sialon in a total amount of 93% by weight or more.

The sintered body must have a density of 96% or more of the theoretical density, particularly preferably 99% or more. The density of the sintered body is a very important requirement, and if it is not satisfied, the strength will be weak and the life will not be long. For example, an all-ceramic roll having a density of about 95% of the theoretical density easily breaks during rolling. The density of the sintered body is 96 of the theoretical density.
%, Particularly preferably 99% or more, the effect of preventing the roll from cracking due to the load applied during rolling is significantly enhanced.

Specifically, a size in the range of 0.2 to 50 μm is desirable. Particularly desirable is 25 μm or less.
When the particle size of the raw material powder is smaller than 0.2 μm, the powder tends to scatter in the atmosphere when mixed, and the powder becomes difficult to handle. If the particle size of the powder is larger than 50 μm, it is difficult to increase the density and a high pressure is required to produce a sintered body. Further, the strength of the produced sintered body, especially the bending strength, is remarkably lower than that of the sintered body having a grain size smaller than that.

In order to produce a sintered body having a density of 96% or more of the theoretical density, it is desirable to adopt a method by pressure sintering. As a method of pressure sintering, it is desirable to apply, for example, a hot pressing method or a hot isostatic pressing (HIP) method. The hot pressing method mixes raw material powders,
It is preformed at normal pressure, then put in a die and heated to a predetermined temperature with mechanical pressure applied to sinter.

As an example, a sintered compact containing 95% by weight or more of silicon nitride and further containing alumina and yttria and having a density of 97% or more of the theoretical density is about 100 kgf / mm at a temperature of 1000 ° C. or less.
Withstands bending strength of ² .

In the HIP method, raw material powders are mixed, preformed, and then heated in an inert gas such as nitrogen gas to a predetermined temperature for sintering.

As an example, a sintered body produced by the HIP method containing silicon nitride as a main component and yttria as a sintering aid becomes a sintered body having a theoretical density even if the amount of yttria is 0.5% by weight.

With respect to the sintering temperature, when silicon nitride is used as a main component, the density of the sintered body is rapidly increased by sintering at a temperature of 1400 ° C. or higher and becomes close to the theoretical density.

In order to prevent uneven thickness of the material to be rolled due to deformation of the roll during rolling, the roll may be provided with a crown. The crown may be either a convex crown or a concave crown, and it is desirable to use them properly depending on the situation. The initial crown attached to the roll of the present invention may be either convex or concave, and is preferably 300 μm or less.

[0082]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] FIG. 1 is a sectional view of a ceramic roll according to the present invention. The ceramic used in the present invention is a sialon ceramic. The chemical formula of sialon ceramic is S
i _6-Z AlzOzN _gz , z is 0 to 4.2, and is called β-sialon.

In the present example, β-sialon powder with z = 0.5 was used, and after adding a small amount of binder, methanol was added and wet kneading was performed, followed by granulation by a spray drying method. Then, it was pressed into a cylindrical shape by cold isostatic pressing, degreased, and sintered in a nitrogen atmosphere to obtain a sialon sintered body.

Starting material is 85 wt%, Si ₃ N ₄ , 7w
t%, Y ₂ O ₃ , 5 wt% Al ₂ O ₃ and 3 wt% AlN. To this, 1.4 wt% of PVB (polyvinyl butyral) and 40 wt% of industrial methanol was added to the raw material powder, and the mixture was wet-mixed in a pot mill for 4 hours, and then the average particle size was measured using a centrifugal spray spray dryer. 65μ
m granulated powder was obtained. Formed using a cold isostatic press 1
It was carried out at a pressure of 00 MPa. Next, after removing the resin component in the molded body by using a degreasing furnace at 600 ° C. for 40 hours and pre-baking, primary cutting is performed, and then suspended in a graphite induction heating type baking furnace in the axial direction, Firing was performed at 1750 ° C. in a pressurized nitrogen gas of 0.9 MPa. Sialon after firing has a composition represented by the chemical formula of Si _5.5 Al _0.5 O _0.5 N _7.5 .

As shown in FIG. 1, the ceramic roll is processed by first forming convex portions 5 on both ends of the ceramic roll 1 and forming a SUS pipe as a buffer material 4 in advance in a coil spring shape matching the diameter of the convex portion 5. And a recessed portion slightly smaller than the winding diameter of the SUS pipe (for example, convex portion + 26.00 mm when the diameter of the SUS pipe is 26.06 mm), center hole 3
And a metal cap 2 made of die steel, which is a kind of alloy tool steel having a Rockwell hardness of 55, which is hardened and tempered with a through hole 7, is heated to about 800 ° C. to be thermally expanded, and S
It was fitted and fixed from above the US pipe.

FIG. 2 shows a structure in which the metal cap 2 is fixed with an adhesive.

A metal cap 2 having a recess corresponding to the projections 5 at both ends of the ceramic roll 1, a center hole 3 and a through hole 7 is formed, and a die steel cap having a Rockwell hardness of 55 is hardened and tempered by quenching and tempering with an epoxy. The convex portion 5 was fitted and fixed by an adhesive. The cap of the adhesive portion 10 was 0.2 mm.

Although not shown, the end portion of the ceramic roll can be made uneven, and a metal cap for centering the roll can be adhesively fixed to the recess. This is a method in which a concave portion is formed at the end of a ceramic roll, and a convex metal cap having a center hole aligned with the concave portion is adhered and fixed using an epoxy adhesive.

The body of the above three types of ceramic rolls was polished by using the polishing apparatus shown in FIGS.

Grinding of the body of the ceramic roll 1
After pressing to both centers using the center holes 3 to form a predetermined size, finish polishing was performed to finish the surface roughness Ramax to 1.0 μm or less. In addition, diamond abrasive grains were used for grinding and polishing, and polishing was performed by rotating the inside of an AIN V-shape by centering. Since there is no galling or center wear at the center pressing portion due to the metal cap 2, it is possible to perform highly accurate grinding with a roundness of 1 μm or less and a cylindricity of 5 μm or less.

FIG. 4 is a schematic side view of the polishing apparatus, and FIG. 5 is a plan view thereof. A circular object to be polished 21 is held by a driving device (not shown) so as to be rotatable and reciprocally movable in the axial direction. The drive device is formed so that the polishing time is substantially constant over the entire length of the object to be polished 21 by repeating the reciprocating movement. The peripheral speed during rotation is 1 to
It is about 300 m / min. The object to be polished 21 is processed into a rolling roll or the like. The present embodiment is a ceramic roll, and metal caps 2 are fitted on both ends. This polishing apparatus is almost the same as a lathe except that the tool mounting portion is changed to the above-mentioned polishing portion.

Two surfaces of the V-shaped pad 23 are in contact with the lower surface side of the object 21 to be polished. This V-shaped pad 23
Are formed of a material softer than the abrasive grains. As a result, the concave portion 25 having a concave curved surface shape is naturally formed, and the concave portion 25 is uniformly pressed against the object to be polished 21, and it is possible to prevent polishing scratches due to uneven contact or the like. The recess may be formed in advance. The pad 23 is held in a holding portion of the pressing means, that is, a support block 26.

The pressing means includes a holding portion for holding the pad 23, that is, a support block 26, and the support block 2
It comprises a support rod 28 for rotatably supporting the 6 at one end, a receiving portion for a load 30 provided at the other end of the support rod 28, and a fulcrum 29 for supporting the support rod 8 in the middle. Therefore,
Since the support rod 28 can swing with the fulcrum 29 as a support point,
Even if the object to be polished 21 slightly vibrates during polishing, the contact pressure between the pad 23 and the object to be polished 21 becomes substantially constant. As a means for keeping the contact pressure constant, the support block 26 may be directly biased by spring force, hydraulic pressure or magnetic force instead of the load 30 and the support rod 28. The support block 26 is connected to a support rod 28 by a rotary shaft 27, so that the pad 23 oscillates with respect to the object 21 to be polished following its movement during polishing. Therefore, the pad 23 freely moves in the pressing direction according to the unevenness of the object 21 to be polished, and comes into contact with the object without rotation.

A slurry supply means 31 for supplying a slurry 24 containing polishing abrasive grains is provided between the object to be polished 21 and the pad 23. In this embodiment, the slurry 24 can be dripped from the tank and continuously supplied. Even with the conventional device, the roundness can be finished to about 1 to 3 μm, so that the device according to the present invention is preferably ground to about 1 to 5 μm. By this degree of grinding, it is possible to manufacture a ceramic roll having an average circumferential undulation of the outer surface of 0.3 μm or less and no grinding scratches. If the circumferential waviness is 0.3 μm or less, the waviness of 0.3 μm or less is not transferred to the surface of the material to be rolled by the roll, so that so-called chatter marks do not occur. The waviness is preferably 0.1 μm or less. Further, since the grinding marks are hardly transferred on the surface of the material to be rolled, the glossiness has no directionality and the surface property is uniform and excellent.

A cylindrical polishing method for a sialon ceramic roll (hereinafter referred to as sialon roll) will be described with reference to FIG. Finally, the sintered body was ground and polished to a predetermined roll size. In this way, an object to be polished 21 having an outer diameter of 60 mm and a length of 550 mm, which has been finished to have a roundness of approximately 1 μm by grinding and polishing, is set in an ordinary cylindrical polishing apparatus with both centers fixed. Then, softer than roll 5
Two pieces of aluminum nitride pad 23 having a length of 0 mm, a length of 40 mm and a thickness of 10 mm are fixed to a metal support block 26 at an angle of 90 ° C. The support block 26 is connected to a support rod 28 by a rotary shaft 27. In addition, the support rod 28 is a fulcrum
9 is fixed. The hardness of sialon roll is 16G
Pa, the hardness of the pad is 13 to 14 GPa, and the hardness of the abrasive silicon carbide powder is 24 GPa.

In polishing, first, the object to be polished 21 is rotated at a peripheral speed of 40 m.
After rotating at / min, the weight 30 is placed and the pad 23 is pressed against the workpiece 21. Further particle size 15-2
A slurry 24 of 0 μm of silicon carbide powder and water is continuously dropped and supplied to the contact portion between the object to be polished 21 and the pad 23.

Further, the sialon roll is reciprocally traversed left and right. Traverter speed is 100 mm / min
Good degree. The silicon carbide slurry used is made finer in order according to the desired surface roughness. In this example, the particle size of the silicon carbide powder is 15 to 20 μm, 10 to 15 μm, 5
Four types of ˜8 μm and 1 to 2 μm were sequentially used, and polishing was performed for about 20 minutes each. The peripheral speed is also increased as the particle size becomes finer, for example, 70 m / min for particle sizes of 1-2 μm.
And the peripheral speed.

In this example, after the above-mentioned rough polishing, mirror surface polishing by buff was further carried out. The sialon roll having the surface roughness Ra = 0.06 μm obtained by the above polishing was mirror-polished. The basic polishing method of the mirror polishing method is the same as described above. That is, a buffing cloth is put between the object to be polished 21 and the pad 23. 1 to 1 abrasive grain
The object to be polished 21 is a slurry containing 2 μm of silicon carbide powder.
And the buffing cloth 20 were continuously dropped. Polishing was performed on the object to be polished 21 at a peripheral speed of 80 m / min and a traverse speed of 10 mm / min for 30 minutes. As a result, a sialon roll having a mirror surface with a surface roughness Ra of 0.01 μm or less could be obtained.

As a result, it was possible to obtain a sialon roll having a circularity of 0.1 μm or less and having no processing marks such as feed marks. The surface roughness was Ra = 0.01 μm.

In the above description, the embodiment in which the outer surface of the roll is polished as the circular member has been shown, but the inner surface of the cylindrical object can be similarly polished by pressing the pad against the inner surface. .

As a result of measuring the waviness of the surface of the ceramic roll manufactured by the polishing apparatus according to the present invention, the roll surface according to the present invention had the extremely small waviness and had substantially the same polishing surface over the entire length of the roll body. . Moreover, as a result of inspecting the surface condition with a microscope of 30 times, no grinding marks, hair cracks, micropores and foreign matter were observed,
Further, the reflectance of light at an incident angle of 60 degrees was also measured, but it was almost the same in both the circumferential direction and the axial direction.

As described above, the surface of the body of the sialon ceramic was polished so as to have a mirror surface with an average surface roughness Ra ≦ 0.03 μm. After drying. Furthermore, as a result of performing shot blasting using alumina particles having an average particle size of several tens of microns, the average surface roughness Ra of the picture portion not coated with the rubber material is 0.3.
A pattern due to a difference in surface roughness could be formed on the surface of the roll body in the range of up to 0.5 μm.

Further, as a result of finish rolling of the stainless material using the above roll, the pattern of the roll body was clearly transferred to the stainless surface as shown in FIG. In the figure, the background part of the picture, the cloth part and the face of the kimono, the outline of the kimono, the picture of the plant, the lines are roughened at once, and these are separately roughened several times to roughen the latter. After coarsely roughening first,
The former is roughened slightly more smoothly than the latter.

Next, a rolling mill equipped with the rolling roll according to the present invention will be described with reference to FIGS. 6 and 7. In the figure,
13 is a work roll made of high-strength sialon having a bending strength of 80 kgf / mm ² , and has a diameter of 60 mm and a length of 100.
It has a cylindrical shape of 0 mm. The work roll 13 is manufactured by the above-described method in the form of a cylinder having metal caps fitted at both ends thereof (shrink-fitting with a SUS pipe or joined with an adhesive). The dimensional accuracy and surface accuracy of the work roll 13 are the same as those of metal rolls.
The work roll 13 has a reinforcing roll 1 including a shaft portion and a body portion.
4 is pressed and the work roll 13 is driven to rotate by the rotational drive of the reinforcing roll 14. The shaft portion of the reinforcing roll 14 is a universal joint (not shown),
It is rotationally driven by an electric motor (not shown) via a reduction gear (not shown). The shaft of the reinforcing roll 14 transmits a rolling reaction force to a bearing (not shown) provided on the shaft. A steel ball 18 is arranged on each end face of the work roll 13 so as to be in contact with the center of the end face, and the steel ball 18 is rotatably supported by a steel ball support 19. for that reason,
The movement of the work roll 13 in the axial direction is restricted. In addition, the sliding speed between the work roll 13 and the steel ball 18 is reduced so that seizure or the like does not occur. Support rolls 15a are arranged in contact with the work rolls 13 before and after the work rolls 13 in the rolling direction.
Another support roll 15b is disposed in contact with the. The other support roll 15b plays a role of reinforcing the support roll 15a. Support roll 15 different from support roll 15a
Bearing b is supported by a bearing 17. The bearing 17 is housed in a bearing box 16. Since the support roll 15a is disposed in contact with the work roll 13 before and after the work roll 13 in the rolling direction, the movement of the work roll 13 in the rolling direction is restricted. Reference numeral 20 denotes a material to be rolled by the work roll 13, which is a stainless steel plate (SUS304) having a plate width of 750 mm and a plate thickness of 0.2 mm.

As a result of conducting a rolling experiment by rotating the reinforcing roll 14 at a speed of 30 revolutions per minute, the material 20 to be rolled was sufficiently rolled. As a result of observing the surface of a material to be rolled having a thickness of 0.2 mm of SUS304 magnified 50 times by a rolling mill equipped with the rolling roll according to the present invention, in the case of the conventional example, cutting was performed along the grinding direction. The streaks were transferred, but in the case of the present invention, they were scarcely present. Further, in this case, the work roll 13 made of ceramic is not damaged, and the glossiness in the rolling direction is equal to that in the direction perpendicular thereto, and the glossiness at the incident angle of 60 degrees is 65% or more, which is extremely high. It was possible to obtain a good rolled material having a high value. For such a roll, the picture shown in FIG. 3 was roughened a plurality of times and skin pass rolling was carried out. Since the roll wear was small, a clear picture with excellent transferability was obtained despite a large amount of rolling. A rolled material having the above was obtained.

Example 2 Body diameter 80 with 70 to 95 weight WC as the main component and Co as the binder metal
A cemented carbide roll made of a sintered body having a length of 1800 mm and a body length of 1800 mm was subjected to rough polishing and buffing as in Example 1. However, diamond powder was used as the abrasive grains. As a result, it was possible to obtain a cemented carbide roll having a circumferential waviness of 0.3 μm or less and a mirror surface having a surface roughness Ra of 0.01 μm or less. In particular, the conventional cylindrical polishing was a problem, and scratches that were unavoidable could be almost completely eliminated by the polishing according to the present invention. Also in this example, the metal cap for centering shown in FIG. 1 was fitted by shrink fitting as in Example 1, and a pattern was similarly formed. Further, in the same manner as in the first embodiment, the same SU
As a result of rolling the S304 steel, it was confirmed that a material to be rolled having a similarly excellent transfer property and a clear pattern was obtained.

[Embodiment 3] FIGS. 8 and 9 show the arrangement of rolls in the rolling section of the rolling mill used in this embodiment. The pair of work rolls 13 is a high-strength sialon (Si-A) having a bending strength of 80 kgf / mm ² obtained by the manufacturing method shown in Example 1.
1-O-N) and has a round bar shape with a diameter of 50 mm and a length of 1000 mm.

A pair of intermediate rolls 33 and a pair of reinforcing rolls 34 composed of a shaft portion and a body portion are pressed against the work rolls 13, and the work rolls 13 are rotated by the rotational drive of the intermediate rolls 33. ing.

The shaft of the intermediate roll 33 is rotationally driven by an electric motor (not shown) via a universal joint (not shown) and a reduction gear (not shown). Further, the shaft portion of the intermediate roll 33 transmits the rolling reaction force to a bearing (not shown) provided on the shaft portion.

On each end surface of the work roll 13, the work roll support bearing 39 and the support portion 38 support the movement of the work roll 13 in the axial direction so as to rotate in synchronization with the rotation of the ceramic roll. Therefore, the movement of the work roll 13 in the axial direction is restricted.

Before and after the work roll 13 in the rolling direction, two pairs of support rolls 42 are arranged in contact with the work roll 13 and in the front and rear. The support roll 42 has a role of preventing bending of the work roll 13 in the rolling direction. Further, the support roll 42 is supported by the cylindrical roll 35. The intermediate roll 33 can be shifted left and right and is provided with a taper on one side.

As the material 20 to be rolled by the work roll 13, a stainless steel plate having a thickness of 0.1 mm and a width of 900 mm was used. The intermediate roll 42 was rotationally driven at 30 rpm and skin pass rolling was performed. As a result, the roll pattern was 2
Well transferred to 0. In addition, the work roll 13 made of sialon was not damaged even if skin pass rolling was repeated,
Moreover, highly accurate transfer was obtained over a long distance. The support roll 42 has the same diameter as the work roll 13, and the intermediate roll 33 is preferably 2.3 times the diameter of the work roll 13 and preferably 1.9 to 2.7 times. The reinforcing roll 34 is 3.3 times as large as the diameter of the intermediate roll 33, and is 2.9-
It is preferably 3.7 times. The cylindrical roller 35 times is a bearing that supports the rolled material 10 across its width.
Reference numeral 36 is a reinforcement roll chock, 37 is a chock that is movable in the axial direction, and 38 is a front door that allows the work rolls to be replaced. Reference numeral 39 is a thrust bearing.

To process the ceramic roll, as shown in FIG. 10, first, the convex portions 5 are formed on both ends of the ceramic roll 11, and the SU is formed in advance into a coil spring shape matching the diameter of the convex portion 5.
The cushioning material 4 made of an S pipe is wound, and the concave portion (for example, a convex portion + 26.00 mm when the diameter of the SUS pipe is 26.06 mm is 26.00 mm) slightly smaller than the winding diameter of the SUS pipe, the center hole 3 and the through hole 7 are formed. Equipped with SUS304 steel metal cap 2 body, Rockwell hardness 55 C2.4%, Cr
30%, W10.5%, residual Co stellite alloy build-up layer 43 is provided on the end face and the center hole, heated to about 800 ° C. for thermal expansion, and shrink-fit from above the cushioning material 4 made of SUS pipe. Fixed by. The overlay layer 43 remains welded.

The characters or patterns of the body of the ceramic roll 11 are formed by pressing both centers using the center holes 3 in the same manner as in Example 1, and after finishing to a predetermined size, finish polishing is performed to obtain the surface roughness. Ramax was 1.0 μm or less. rear,
By performing shot blasting once or a plurality of times, three-dimensional shaded characters and patterns can be obtained.

Fourth Embodiment FIGS. 11 and 12 show a third embodiment.
2 is a rolling mill showing an example in which a reinforcing bearing 47 is used instead of the reinforcing roll in FIG. The reinforcing bearing 47 is shown in FIG.
As shown in, a pair of intermediate rolls 33 is provided. The diameter of the support roll 42 in this embodiment is slightly smaller than the diameter of the work roll 13 and is preferably 0.78 to 0.9 times. The diameter of the intermediate roll 33 is 2.9 times, preferably 2.5 to 3.5 times the diameter of the work roll 13. The diameter of the reinforcing bearing 47 is 1.3 times the diameter of the intermediate roll 33, preferably 1.0 to 1.8 times.

Using the above ceramic rolls, stainless steel, Fani alloy, etc., having a thickness of 0.2 to 2.0 mm and a plate width of 6
It could be rolled at a speed of 50 to 1350 mm and a speed of 300 to 800 m / min. As the material to be rolled, neither the rolling direction nor the directionality in the rolling direction was observed, and the reflectance was almost the same. Example 1 using such a roll
A pattern or the like was formed in the same manner as above, and a rolled material having a pattern was formed by a skin pass mill.

[0117]

The character having the metal cap of the present invention,
A ceramic roll with a pattern is less likely to cause galling or center wear at the center during surface grinding of the roll, so there is less axial runout of the roll, and as a result, machining accuracy such as roundness and cylindricity can be improved. In the smooth part, there is no anisotropy and high precision ceramics and carbide rolls, and the rolling distance can be lengthened in transferring characters and patterns.

According to the present invention, since the polishing is performed by the slurry containing the abrasive, the sharpness can be kept constant,
Therefore, it is possible to prevent the processing marks such as the feed mark from being damaged, and it is possible to significantly improve the roundness. Further, the surface roughness of the polishing surface can be easily changed by changing the particle size of the abrasive.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a ceramic roll of the present invention.

FIG. 2 is a sectional view of a ceramic roll of the present invention.

FIG. 3 is a pattern diagram showing the surface of a material to be rolled.

FIG. 4 is a side view of the polishing apparatus according to the present invention.

FIG. 5 is a plan view of a polishing apparatus according to the present invention.

FIG. 6 is a sectional view of a rolling mill using a ceramic roll.

7 is a rolling mill A- using the ceramic roll of FIG.
A sectional drawing.

FIG. 8 is a sectional view of a rolling mill using a ceramic roll of Example 3.

FIG. 9 is a sectional view of a rolling mill using a ceramic roll of Example 3.

FIG. 10 is a sectional view of a ceramic roll according to a third embodiment.

FIG. 11 is a cross-sectional view of a rolling mill using a ceramic roll of Example 4.

FIG. 12 is a sectional view of a rolling mill using a ceramic roll of Example 4.

[Explanation of symbols]

1, 11 ... Ceramic roll, 2, 12 ... Metal cap, 3 ... Center hole, 4 ... Buffer material, 5 ... Convex part, 6 ... Relief part, 7 ... Through hole, 10 ... Adhesive part, 13, 41 ... Work Rolls, 14, 34 ... Reinforcing rolls, 15, 25 ... Recesses, 15
a, 15b, 42 ... Support roll, 16 ... Bearing box, 17 ...
Bearing, 18 ... Steel ball, 19 ... Steel ball support, 20 ... Rolled material, 21 ... Grinding object, 23 ... Pad, 24 ... Slurry,
26 ... Support block, 27 ... Rotating shaft, 28 ... Support rod, 2
9 ... Support point, 30 ... Load, 31 ... Slurry supply means, 32
... surface, 33 ... intermediate roll, 43 ... overlay layer.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B21B 3/00 B21B 3/00 J L 13/14 13/14 A 27/02 27/02 J

Claims (20)

[Claims] 1. A rolling roll having a smooth region and a plurality of regions having different surface roughnesses. 2. A rolling roll having a smooth region and a plurality of regions having different surface roughnesses on the surface of a ceramic member or a cemented carbide member. 3. The rolling roll according to claim 1, wherein the plurality of regions having different surface roughnesses are at least one of pictures, characters, patterns and figures. 4. A method for producing a rolling roll, comprising forming a plurality of regions having different surface roughness on a surface having a smooth surface. 5. A method of manufacturing a rolling roll, comprising the steps of forming a smooth surface and forming a plurality of regions having different surface roughnesses on the smooth surface. 6. A material to be rolled having a smooth surface having no anisotropy and a plurality of regions having different surface roughness. 7. A rolled material according to claim 6, which is one of a ferritic stainless steel, an austenitic stainless steel, copper, aluminum, a Ni-based alloy, a plated steel sheet of aluminum or zinc or tin, and a resin-coated steel sheet. 8. A rolling mill in which a work roll is driven to rotate by rolling drive of a reinforcement roll or a pair of intermediate rolls reinforced with a reinforcement bearing as a back, and the work roll is a ceramic roll or a cemented carbide roll. And
The roll has a smooth region and a plurality of regions having different surface roughness on the body surface, and the roll provided in contact with the end face or a support bearing rotating in synchronization with the roll allows the roll to move in the axial direction. A rolling mill characterized by being blocked. 9. The rolling mill according to claim 8, wherein the ceramic roll is provided with a metal cap at an end thereof, and at least an end surface of the cap is made of a metal having a Rockwell C scale hardness of 40 or more. . 10. The ceramic roll is provided with a metal cap having a center hole at an end thereof, and a metal layer having a hardness higher than that of the cap main body is provided on an end surface of the cap. Rolling machine described. 11. The rolling mill according to claim 8, wherein the metal cap is provided with a through hole in the center hole. 12. The rolling mill according to claim 8, wherein a metal cap is fitted to the end portion of the ceramic roll with a metal cushioning material interposed. 13. The rolling machine according to claim 12, wherein the metal buffer material is formed into a tubular shape, a ring shape or a coil shape made of a soft metal thin plate, a metal pipe or a metal wire. 14. The rolling mill according to claim 8, wherein the metal cap is shrink-fitted. 15. The rolling according to claim 9, wherein the end portion of the ceramic roll and the metal cap have a cap of 0.05 to 0.3 mm, and the cap is filled with an adhesive. Machine. 16. The surface of the ceramic roll is roughened, or is formed by a mirror surface portion having a roughness Ra of 0.07 μm or less and a rough surface portion having a roughness Ra of 0.1 to 1 μm. The rolling mill according to claim 8, wherein a pattern is formed. 17. A rolling mill in which a work roll is subordinately rotated by rotational driving of an intermediate roll or a reinforcing roll to perform rolling, and the work roll is made of a long round rod-shaped ceramic or super hard roll, and the outer surface of the roll. Surface roughness is almost the same in the circumferential and axial directions, and the circumferential waviness is 0.3μ.
m or less and a plurality of areas having different surface roughness on the surface of the body portion, the bearings are arranged in contact with the respective end surfaces of the work roll to restrain the movement of the work roll in the axial direction. A rolling mill, wherein support rolls are disposed in contact with the work rolls before and after the work rolls in the rolling direction to restrain movement of the work rolls in the rolling direction. 18. A rolling mill according to claim 17, wherein at least one of the intermediate roll, the reinforcing roll, the work roll and the supporting roll is provided with a crown. 19. A ceramic roll having a smooth surface portion and a roughened portion, and having no anisotropy in at least one of surface roughness, waviness and light reflectance on the smooth surface. A rolling roll characterized in that 20. A smooth surface portion and a roughened portion are provided, and at least one of surface roughness, waviness and light reflectance on the smooth surface is not anisotropic. Material to be rolled.