JP2985371B2 - Ceramics roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic roll for rolling with metal caps having center holes at both ends.

[0002]

2. Description of the Related Art In a conventional ceramic roll for rolling, the entire roll is made of ceramics, and no consideration is given to a center hole at the time of roll grinding. A ceramics roll is known in Japanese Patent Application Laid-Open No. 197307/1984, but the specific overall structure of the roll is not shown.

[0003]

The above prior art does not consider the center hole at the time of roll grinding.
There were problems such as machining flaws due to center run-out and a decrease in machining accuracy. That is, in the prior art, the processing center hole is formed in the ceramic by using the entire roll as the ceramic. Therefore, when processing such as cylindrical grinding using a conventional metal or carbide center, the center hole and the center made in ceramics will seize and the center will wear, and the center axis accuracy will decrease. As a result, the ceramic roll causes rotational runout, and as a result, not only processing flaws are generated but also processing accuracy such as roundness and cylindricity is reduced.

[0004] It is an object of the present invention to provide a ceramic roll which does not reduce the axial accuracy of the center due to galling or wear of the center during cylindrical grinding, and does not cause any processing flaws or reduction in processing accuracy.

[0005]

An object of the present invention is to provide a rolling cell.
In the Lamix roll, the axis of the ceramic roll is
Attach metal caps at both ends in the direction
This is achieved by providing a machining center hole in the cap.
You.

[0006]

[Function] If a center hole is used in a metal cap made of die steel or bearing steel attached to both ends of a ceramics roll, there is almost no galling with the center and little wear of the center during cylindrical grinding. There is no decrease in axis accuracy.

The metal cap preferably has a Rockwell C scale hardness of 50 or more, and in particular, tool steel having a hardness of 50 to 65 can be used, and tool steel used for a rolling roll is used. In particular, hardened and tempered tool steel is used. The composition is C0.6-
Carbon tool steel of 1.5%, Si 1% or less, Mn 1% or less,
C 0.5-1.6%, Si 1% or less, Mn 1% or less, Cr
3 to 5%, or Mo to 3 to 10%, W3 to 12
%, V0.5 to 5%, or W10 to the former.
High speed steel containing 20% or 3-15% Co in both, C
0.25 to 2.0%, Si 1.5% or less, Mn 1.5% or less, Cr 0.2 to 1.0% or 1.0 to 2.5%, Ni
0.2-3%, Mo 0.2-2%, W 0.5-10%, V
An alloy tool steel containing at least one of 0.1 to 1.5% is used. These steels are used after being quenched and tempered.

The center hole is provided in a conical shape, and a through hole is provided inside the center hole. The through holes are important for preventing air from remaining inside. The through hole is a straight hole with a small hole of 0.5 to 5 mm. This center hole is used to insert into the center tool and transmit rotation to the center tool when cutting and polishing the roll surface. Provide a hole outside the cone that is larger than the flat cone diameter of the tool relief. Is preferred.

The adhesive is preferably an epoxy resin having a high hardness, and the bonding gap is 0.05 to 0.3 in diameter.
mm is preferred.

The ceramic roll is made of a sintered material,
Alumina, silicon nitride, aluminum nitride, silicon carbide, and sialon ceramics are used and have a flexural strength of 3.
It is preferable that the hardness is 00 MPa or more, Vickers hardness is 15 GPa or more, and Young's modulus is 300 GPa or more. In particular, sialon is preferable because it has a bending strength up to about 1000 ° C. and 800 MPa or more.

The surface of the roll is polished by rotating the roll so that it comes into contact with the inside of the V-shape of the ceramic V-shaped pedestal, and by applying an abrasive to the contact surface between the two. High polishing is possible.

Used as a work roll for rolling metal. In particular, stainless steel, Al foil, C
It is used for u thin plates and the like.

[0013]

Embodiment 1 An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a ceramic roll according to the present invention. The ceramic used in the present invention is Sialon ceramic. The chemical formula of Sialon ceramic is represented by _{Si 6-Z Al Z O Z} N gZ, Z is 0 to 4.2
Anything in between is possible, called a β-sialon. In this example, sialon powder having a composition of Z = 0.5 was used, a small amount of a binder was added, and the mixture was wet-kneaded in methanol and granulated by a spray dry method. Next, the powder was compacted into a cylindrical shape by a cold isostatic method, degreased, and sintered at 1700 ° C. in a nitrogen atmosphere to obtain a sialon sintered body.

Further, in the processing of the ceramics roll, first, ceramic projections 5 are formed on both ends of the ceramics 1 and quenching and tempering are provided in advance with recesses, center holes 3 and through holes 7 corresponding to the projections 5. Then, a metal cap 2 made of a die steel of 55 alloy tool steel on a Rockwell C scale was fitted to the convex portion 5 and bonded and fixed via the epoxy-based bonding portion 4. The gap in the bonding was 0.2 mm in diameter.
6 is escape. The through hole has a diameter of 1-2 mm.

The processing of the body of the ceramic 1 is performed by using the center hole 3
After processing to a predetermined size by cylindrical grinding with double center pressing using, surface roughness R _max 1.0 μm by finish cylindrical polishing
Finished below. Grinding and polishing were performed using diamond abrasive grains while rotating by centering inside a V-shape made of AlN. Since there is no galling or center abrasion at the center pressing portion, not only no processing flaws, but also a highly accurate cylindrical processing with a roundness of 1 μm or less and a cylindricity of 5 μm or less was performed.

[0017]

According to the present invention, there is no galling at the center portion during cylindrical processing, and there is no center wear, so that the roll runout is small, so that not only the generation of processing flaws can be prevented, but also the roundness and Processing accuracy such as cylindricity can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ceramic roll according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ceramics, 2 ... Metal cap, 3 ... Center hole, 4 ... Adhesion part, 5 ... Ceramic convex part, 6 ... Relief,
7 ... Through hole.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 27/00 B21B 27/02

Claims (4)

(57) [Claims] 1. A ceramic roll for rolling, wherein a metal cap is attached to both ends of the ceramic roll in the axial direction, and a center hole for processing is provided in the metal cap. 2. The ceramic roll according to claim 1, wherein the metal cap is attached to both ends of the ceramic roll in the axial direction by bonding, and a gap formed by the bonding is set to a diameter of 0.05 to 0.3 mm. A ceramics roll. 3. The ceramic roll according to claim 1, wherein said metal cap has a hardness of 50 to 65 on a Rockwell C scale. 4. The Ssese mix roll according to any one of claims 1 to 3, wherein the metal cap is ceramic roll and having a through hole in the roll axial direction following the center hole .