JP2001219208A - Built-up rolling roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a built-up rolling roll capable of reducing thermal crown. SOLUTION: In the built-up rolling roll which is composed by fitting a barrel- part sleeve on the outer periphery of a shaft part, in the fitting region in the position where a material to be rolled passes through on the surface of the barrel-part sleeve, the outer peripheral surface of the shaft part is directly brought into contact with the inner peripheral surface, In the fitting regions in the vicinities in barrel end parts in positions where the material to be rolled does not pass through on the surface of the barrel-part sleeve, the outer peripheral surface of the shaft part is adiabatically brought into contact with the inner peripheral surface of the barrel-part sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling roll in which a body sleeve is fitted and fixed to a shaft, and more particularly to hot or cold rolling suitable for rolling a sheet material having a sheet width wider than a sheet thickness. About roles.

[0002]

2. Description of the Related Art Rolling rolls are made of plastic working heat by rolling,
The frictional heat, the heat of the material to be rolled that has been heated and raised, and the like are transmitted to the roll, and the temperature of the roll increases. In particular, when the width of the rolled portion is wide as in the case of plate rolling, the temperature of the roll at a position corresponding to the width of the rolled portion increases. In order to prevent the temperature of the roll from rising, the roll is generally cooled by spraying high-pressure cooling water onto the surface of the roll. This cooling suppresses a rise in the temperature of the roll, but the temperature distribution in the direction of the rotation axis of the roll is not uniform, and the temperature at a position corresponding to the width of the rolled portion increases. In the vicinity of the end of the roll body that is not in contact with the material to be rolled, the cooling from the surface is effective, the heat is not directly transmitted from the rolled material, and the heat is diffused to the axle side, so that the temperature rise is small. If the temperature distribution in the rotation axis direction is non-uniform, the diameter of the roll becomes non-uniform due to thermal expansion (thermal crown), and the position corresponding to the width of the rolled portion where the temperature is high is expanded.

In order to control the shape to be deformed in this way,
Various means for providing a hollow hole coaxially with the rotation axis inside the roll and cooling the inside of the roll with cooling water are disclosed. For example, Japanese Utility Model Laid-Open No. 57-127302 discloses that a guide for changing a flow path is inserted into a cooling water guide hole sufficiently smaller than a roll diameter formed in the axial direction of a work roll for cold rolling. Further, a work roll for cold rolling that performs thermal crown control is disclosed. It is said that the guide causes a simple flow of the cooling water in the flow path to be in a turbulent state, thereby performing highly efficient cooling.

Japanese Utility Model Laid-Open Publication No. 3-57405 discloses a cylindrical hollow portion extending from the shaft end on the non-drive side to below the barrel end on the drive side along the axis of the roll body. A fixed pipe whose both ends are open with a gap in the barrel area of the roll body is provided by inserting a movable pipe that can reciprocate in the axial direction on the opposite side of the fixed pipe and controlling the position of the movable pipe. There is disclosed a cooling structure of a work roll for rolling which equalizes internal water cooling in directions.

[0005]

In a roll for rolling, if the thermal expansion increases due to the inflow of heat into the passing plate portion as the rolling progresses, that is, if the thermal crown increases, the thickness in the plate width direction becomes uneven. Therefore, the thermal crown must be reduced. This tendency is particularly remarkable in the case of rolling a sheet material having a wide rolling portion, where the temperature tends to rise. In order to solve this problem, an object of the present invention is to provide an assembling type rolling roll for reducing a thermal crown.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an assembling type rolling roll formed by fitting a body sleeve to the outer periphery of a shaft, and in a fitting area at a position where a material to be rolled passes through the surface of the body sleeve. Then, the outer peripheral surface of the shaft is brought into direct contact with the inner peripheral surface of the trunk sleeve, and in the fitting region near the trunk end where the material to be rolled does not pass through the surface of the trunk sleeve, the outer peripheral surface of the shaft and the trunk The inner peripheral surface of the part sleeve is brought into adiabatic contact.

In the present invention, in the fitting region where the material to be rolled passes through the surface of the trunk sleeve, the finished surface roughness of the outer peripheral surface of the shaft and the inner peripheral surface of the trunk sleeve is Rmax 30 μm.
m or less. In the fitting region where the material to be rolled passes through the surface of the body sleeve, between the fitting surface with the outer peripheral surface of the shaft and the inner surface of the body sleeve, aluminum (Al), copper (Cu), or the like. Characterized in that a high thermal conductive layer is interposed.

In the fitting region near the body end where the material to be rolled does not pass through the surface of the body sleeve, the finished surface roughness of the outer peripheral surface of the shaft portion and / or the inner peripheral surface of the body sleeve is reduced. Rmax is 50 μm or more.

In the fitting region near the body end where the material to be rolled does not pass through the surface of the body sleeve, a hard surface is formed between the fitting surface between the outer peripheral surface of the shaft and the inner peripheral surface of the body sleeve. It is characterized by intervening particles. The hard particles are preferably low thermal conductive particles made of steel or ceramics such as alumina. It is preferable that a gap between the fitting surface between the outer peripheral surface of the shaft portion and the inner peripheral surface of the body sleeve is maintained at 30 μm or more, and that an air layer having low thermal conductivity, that is, a high heat insulating effect is interposed. Further, it is preferable that a filler having a high heat insulating property is charged into a gap between the fitting surface between the outer peripheral surface of the shaft portion and the inner peripheral surface of the body sleeve.

In the assembly type rolling roll of the present invention, it is preferable that the body sleeve is fitted around the shaft by shrink fitting, keying, or a combination of shrink fitting and keying. In addition, a method of pressing in the roll axis direction with a ring having both side surfaces of the body sleeve fixed to the shaft may be used in combination with these assembled structures.

In the fitting region where the material to be rolled passes through the surface of the body sleeve, the outer peripheral surface of the shaft portion and the inner surface of the body sleeve are brought into direct contact, and the material to be rolled does not pass through the surface of the body sleeve. In the fitting area near the body end of the body, the heat input to the body sleeve due to contact with the material to be rolled during rolling is achieved by adiabatic contact between the outer peripheral surface of the shaft and the inner peripheral surface of the body sleeve. Flows from the portion where the outer peripheral surface of the shaft portion and the inner peripheral surface of the body sleeve are in direct contact with each other to the low-temperature shaft portion, thereby preventing heat accumulation in the rolling section. At the same time, in order to prevent heat flow to the shaft from the adiabatic contact parts provided on both sides of the part where the outer peripheral surface of the shaft and the inner peripheral surface of the body sleeve are in direct contact, the body sleeve of that part is As a result of the temperature rise, the temperature difference between the rolled portion and both side portions thereof is reduced, and the thermal crown can be suppressed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic sectional view of an assembling roll according to an embodiment of the present invention. In FIG. 1, the assembling roll 1 is configured by fitting a trunk sleeve 3 to an outer periphery of a shaft 2. Reference symbol R denotes a fitting region where the material to be rolled passes through the surface of the trunk sleeve 3, and symbol E denotes a fitting region near the trunk end where the material to be rolled does not pass through the surface of the trunk sleeve 3.

For the shaft portion 2, a steel material having a composition such as carbon tool steel or alloy tool steel manufactured by forging or casting is used. The outer peripheral surface of the shaft portion 2 has an R region and an E region fitted with the body sleeve 3.
The regions are finished to different surface states.

The body sleeve 3 is made of a tool steel such as alloy adamite, high chromium cast iron or cast steel, alloy glen, high speed steel,
It is made of a wear-resistant material generally used for a rolling roll such as a cemented carbide material. The body sleeve 3 may have a single-piece structure formed entirely of the wear-resistant material, or may have a composite structure in which an outer layer is formed of the wear-resistant material and an inner layer joined to the outer layer is formed of a material having excellent toughness. .

The fitting portion 4 between the outer peripheral surface of the shaft portion 2 and the inner peripheral surface of the body sleeve 3 is in tight-fitting contact, but a material having a low coefficient of thermal expansion such as a cemented carbide material is used for the body sleeve 3. When used, a clearance fit may be used at room temperature. Then, the fitting contact portion in the R region comes into direct contact so that heat is easily transmitted from the body sleeve 3 to the shaft portion 2. More specifically, the finished surface roughness of the outer peripheral surface of the shaft portion 2 and the inner peripheral surface of the body sleeve 3 is R
The adhesion between the two is improved to a maximum of 30 μm or less, more preferably to a maximum of 10 μm or less.

The fitting contact portion in the region E is adiabatic to prevent heat flow from the body sleeve 3 to the shaft portion 2. Specifically, the finished surface roughness of both or one of the outer peripheral surface of the shaft portion 2 and the inner peripheral surface of the body sleeve 3 is Rmax5.
Both are fitted so that the thickness is 0 μm or more.

Alternatively, between the fitting portion 4 between the outer peripheral surface of the shaft portion 2 and the inner peripheral surface of the body sleeve 3, hard particles of steel particles or ceramic particles such as alumina are interposed to fit the two. Combine. When hard particles are interposed, it is preferable that the gap between the fitting portions 4 is maintained at 30 μm or more, more preferably 100 μm or more, and an air layer having low heat conductivity, that is, a high heat insulating effect is interposed. In order to prevent harmful substances such as water from entering the gap from the outside, it is preferable to embed a filler such as an adhesive having a high heat insulating property in the gap. In addition, when hard particles are interposed, it is preferable that the interference of the R region is processed to be larger than the E region in advance when assembling by, for example, shrink fitting so that no gap is generated in the R region directly contacted. . In order to make the effect of the present invention more effective, the thermal crown can be further reduced by using a means for cooling only the R region of the roll of the present invention with water and not cooling the E region with water.

[0018]

According to the assembly type rolling roll of the present invention, the temperature distribution in the roll rotation axis direction tends to be uniform, and the thermal crown at the portion corresponding to the width of the rolled material is small. There is no turbulence, and it is suitable for use in rolling a sheet material. In particular, when the heat input of the roll is large, such as in hot continuous rolling, the thermal crown becomes excessive and the number of continuous rolls is restricted, but according to the present invention, this restriction is eliminated, and the rolling efficiency and The effect of improving product shape quality is brought about.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an assembling roll according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Assembling roll, 2 shaft part, 3 Body sleeve, 4 Fitting part

Claims (9)

[Claims] 1. An assembling roll comprising a body sleeve fitted on an outer periphery of a shaft portion, wherein in a fitting region where a material to be rolled passes through the surface of the body sleeve, the outer peripheral surface of the shaft portion is provided. The inner peripheral surface of the torso sleeve is brought into direct contact with the outer peripheral surface of the shaft and the inner peripheral surface of the torso sleeve in the fitting area near the torso end where the material to be rolled does not pass through the surface of the torso sleeve. A roll of assembling type, characterized in that the rolls are in contact with each other. 2. In the fitting region where the material to be rolled passes through the surface of the body sleeve, the finished surface roughness of the outer peripheral surface of the shaft portion and the inner peripheral surface of the body sleeve is Rmax 30 μm or less. The assembly type rolling roll according to claim 1. 3. A high heat conductive layer is interposed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the trunk sleeve in the fitting region where the material to be rolled passes through the surface of the trunk sleeve. The assembly type rolling roll according to claim 1 or 2, wherein: 4. In the fitting region near the body end where the material to be rolled does not pass through the surface of the body sleeve, the finished surface roughness of the outer peripheral surface of the shaft portion and / or the inner peripheral surface of the body sleeve is Rma.
The assembly type rolling roll according to any one of claims 1 to 3, wherein the size is not less than 50 µm. 5. In a fitting area near a barrel end at a position where a material to be rolled does not pass through a body sleeve surface, a hard surface is provided between a fitting surface between an outer peripheral surface of a shaft portion and an inner peripheral surface of a body sleeve. The assembly type rolling roll according to any one of claims 1 to 4, wherein particles are interposed. 6. The assembling roll according to claim 5, wherein the hard particles are particles made of steel or ceramics. 7. In the fitting region near the barrel end where the material to be rolled does not pass through the surface of the barrel sleeve, a gap between the fitting surface between the outer peripheral surface of the shaft portion and the inner peripheral surface of the barrel sleeve is formed. The assembly type roll according to claim 5, wherein the roll is held at 30 µm or more. 8. The assembling type roll according to claim 7, wherein a heat insulating filler is charged in a gap between a fitting surface between an outer peripheral surface of the shaft portion and an inner peripheral surface of the body sleeve. . 9. The assembling roll according to claim 1, wherein the body sleeve is fitted around the shaft by shrink fitting and / or keying.