JP2987744B2 - Shape sensor 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 shape sensor roll which is installed on at least one of the entrance and exit of a rolling mill in a hot rolling line.

[0002]

2. Description of the Related Art It is important from the viewpoint of product quality to make the shape of a rolled material rolled by a rolling mill uniform. In this case, since a change in the shape of the rolled material cannot be visually determined while the material is running, various shape detection devices for automatically detecting the shape of the material during the travel have been developed.

[0003] Conventional shape detection devices include a contact type and a non-contact type.
As schematically shown in FIG. 1, a detector configured to detect the tension of each part in the width direction of the rolled material (2) on a looper roll that applies tension to the rolled material (2) between the finishing rolling stands (1) arranged in the line direction. Is incorporated into a shape sensor roll (3), and the shape of the rolled material (2) is detected by measuring the tension distribution in the width direction of the rolled material (2).

[0004] Among such contact-type roll-type shape sensor rolls, there is a roll adopting a hollow multi-split roll method. For example, "Plasticity and processing vol.20 no.217 (19)
79-2), p. 91, and Japanese Utility Model Publication No. 3-11691.

As shown in FIGS. 3 (a) and 3 (b), the shape sensor roll of the hollow multi-split roll method has a plurality of axially divided and arranged on the outer periphery of a hollow fixed shaft (4). A nozzle (6) fitted with the rotor (5) and supplying compressed air from a hollow portion to a gap between the fixed shaft (4) and the rotor (5) on the peripheral wall of the fixed shaft (4). Air pressure measurement drilled at predetermined intervals in the axial direction and circumferential direction of the fixed shaft (4), and further communicated with the detection pipe (7) above and below the circumferential wall of the fixed shaft (4). And a detection port (8) for detecting air pressure generated when the rotor (5) is displaced with respect to the fixed shaft (4).
And through a detection tube (7), the detected pressure difference of the air is converted by a static electricity converter (9), and a width direction tension distribution of the rolled material (2) is obtained by an arithmetic unit (not shown). .

Conventionally, a rotatable shaft is used instead of the fixed shaft, and sensors are embedded in the outer peripheral surface of the shaft so as to correspond to the respective rotors. (See Japanese Utility Model Publication No. 3-11692).

However, in the case of the conventional shape sensor rolls described above, since the rotor on the roll surface has a multi-segment structure in the axial direction, when the tension of the rolled material increases, the rolled material is damaged by the divided portions of the rotor. There is a risk of attaching.

Therefore, instead of using the rotor having the multi-segment structure, the use of a thin sleeve having an axially integrated structure has been studied.

[0009] When making this thin-walled sleeve, the sleeve is made thick by casting, and then its surface is shaved to make it thinner. Sleeves are made.

[0010]

However, when manufacturing a shape sensor roll using the above-mentioned thin-walled sleeve, when using the shape sensor roll in a hot rolling line, or when using it in a cold rolling line, In comparison, since heat resistance, wear resistance, corrosion resistance, strength, and the like are required, generally, the sleeve must be cast as described above. In order to obtain the sensitivity of the sensor, the thickness must be reduced to 1
The thickness must be as thin as 0 mm or less. In this case, if the thickness is reduced to 10 mm or less, problems of internal defects such as cracks are easily caused due to porosity peculiar to the cast product. Would. Therefore, it was not possible to find a material for a thin-walled sleeve for a shape sensor roll for use in a hot rolling line, and to date, a shape sensor roll with a thin-walled sleeve that satisfies heat resistance, abrasion resistance, corrosion resistance, and strength has been developed. It is not the fact.

Accordingly, an object of the present invention is to provide a shape sensor roll employing a thin sleeve which can be used in a hot rolling line.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a large number of sensors (1) along an axial direction.
5) An inner layer material (12) made of a steel pipe on the outer periphery of a core shaft (10) assembled at required intervals, and an outer layer material formed by coating a high-speed metal powder on the outside of the inner layer material by hot isostatic pressing. The multi-layered material described in (13) is fitted to form a thin-walled sleeve (14) structure.

The component range of the outer layer material (13) is represented by C:
1.4 to 2.4%, Si: 0.2 to 1.5%, Mn:
0.2 to 1.0%, Cr: 10 to 18%, Mo: 0.5
1.0%, V: 6% or less, with the balance being substantially Fe.

[0014]

Since the sleeve (14) has a multi-layer structure consisting of an inner layer material (12) made of a steel pipe and an outer layer material (13) formed of a high-speed metal powder by hot isostatic pressing, heat resistance is improved. And abrasion resistance, corrosion resistance, strength, and the like can be obtained, which facilitates the thinning of the sleeve (14).

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) show an embodiment of the present invention, in which a hollow core shaft (both ends of which are rotatably supported by bearings (not shown)). A step (11) for forming a gap along the axial direction is provided on a part of the outer peripheral surface of (10), and a number of sensors (15) are provided at the position of the step (11) for forming the gap on the core shaft (10). Are assembled at required intervals, and the inner layer material (12) and the outer layer material (1) are mounted on the outer periphery of the core shaft (10).
3) A thin-walled sleeve (14) having a multilayer structure comprising
Is fitted. As the sensor (15), a case where an air bearing is used or a displacement meter has been used, but it is preferable to use a load cell as a sensor for a rolling mill.

The sleeve (14) is made of an inner layer material (12).
Is made of SCM440 steel pipe, and the inner layer material (1
Outside of 2), as an outer layer material (13), a high-speed metal powder is coated with HIP (Hot Isostatic Press) to form a multi-layer structure, and then the surface of the outer layer material (13) is precisely formed. The thickness is reduced to 10 mm or less by cutting. The high-speed metal powder as the outer layer material (13) is as follows: C: 1.4 to 2.4%, Si: 0.2 to 1.5%
%, Mn: 0.2 to 1.0%, Cr: 10 to 18%, M
o: 0.5 to 1.0%, V: 6% or less, with the balance being substantially Fe. In addition, all% are weight%.

In the component range of the outer layer material (13),
C: 1.4 to 2.4% is that C is a carbide forming element and combines with V, Ti, Nb, W, Mo, Cr, etc. to form MC, M6C, M2C, etc. Forming carbides,
Although the hardness of the alloy is increased, if less than 1.4%, such an effect is insufficient, and if the amount is increased, excessive precipitation or coarsening of carbide causes deterioration of toughness of the alloy and deterioration of workability. The upper limit was 4%.

Si: 0.2-1.5% is made of Si
Is an element that enhances the hardenability, but if it is less than 0.2%, such an effect is insufficient, and if it is contained in a large amount, the material becomes brittle, so the upper limit is 1.5%.

Mn: 0.2-1.0%
Has a deoxidizing effect and has an improved hardenability, but if it is less than 0.2%, such effect is insufficient, and a large amount of addition causes the austenite grains to become large at high temperatures, resulting in embrittlement of the alloy. Therefore, the upper limit was set to 1.0%.

The content of Cr: 10 to 18% is an element that improves the corrosion resistance to oxidizing acids, and is effective even when contained in a small amount. Particularly, when the content is 10% or more, the corrosion resistance is significantly improved. However, if the content is large, the upper limit is 18% because the material becomes brittle.

Mo: 0.5 to 1.0%
Is an element which improves the corrosion resistance to non-oxidizing acids, but if its content is less than 0.5%, its effect is not sufficient.
Was set as the upper limit.

The reason why V is set to 6% or less is that V forms a solid solution in the matrix of the sintered alloy, and the fine MC is formed by tempering.
The effect is increased by increasing the amount of carbide, which precipitates type carbides and brings about remarkable secondary hardening. However, when added in a large amount, excessive precipitation of carbides lowers the toughness of the alloy and deteriorates workability. % As the upper limit.

When the above-configured shape sensor roll of the present invention is used in such a manner that a tension is applied to the rolled material (2) on the entrance side and / or the exit side of the rolling mill, In accordance with the tension distribution in the width direction of (2), the thin-walled sleeve (14) bends at the space (16) formed between the sleeve (14) and the core shaft (10). The tension distribution in the width direction of the rolled material (2) is measured by the detection by the sensor (15).

In the above, the sleeve (14) fitted around the outer periphery of the core shaft (10) is made of a steel pipe inner layer material (1).
Outside layer material of high-speed metal powder (13) outside of 2)
Is formed by HIP, so that the thickness can be reduced without causing internal defects as in the case of a cast product. In addition, since the inner layer material (12) is a steel pipe, strength against tensile, elongation, toughness, impact and the like can be obtained.
Since it is a molded product, heat resistance, wear resistance, and corrosion resistance can be obtained. Therefore, it can be used stably as a shape sensor roll of a rolled material in a hot rolling line.

The inventors of the present invention set the component composition of the outer layer material (13) to C: 2.2%, Si: 0.3%, Mn: 0.1%.
3%, Cr: 16.8%, Mo: 0.5%, V: 5.6
%, Fe: Bal, and an experiment was conducted by trial production of the sleeve (14). As a result, extremely excellent results were obtained in each section of heat resistance, wear resistance, corrosion resistance, and strength.

In the above embodiment, the case where the core shaft (10) is hollow is shown. However, if the core (10) has a hole through which the wiring for the sensor (15) passes, it may be solid. 14) A structure having three or more layers by interposing an intermediate layer material such as an SNCM material between the inner layer material (12) and the outer layer material (13), and other ranges that do not depart from the gist of the present invention. It is needless to say that various changes can be made within.

[0028]

As described above, according to the present invention, a thin-walled sleeve (14) is fitted around the core shaft (10) on which the sensor (15) is assembled, and the deformation of the sleeve (14) is detected by the sensor. In the shape sensor roll to be detected in (15), the sleeve (14) is coated with a steel pipe as the inner layer material (12), and a high-speed metal powder is coated on the outside with a hot isostatic press. Outer layer material (1
3), the sleeve (14)
Heat resistance, abrasion resistance, corrosion resistance, strength, and the like can be obtained, the thickness can be easily reduced, and therefore, it can be used for detecting the shape of a rolled material in a hot rolling line, An excellent effect that high reliability can be obtained is exhibited.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a shape sensor roll according to the present invention, wherein (a) is a schematic perspective view of the whole, and (b) is a partially enlarged sectional view.

FIG. 2 is a schematic diagram illustrating an example of a usage state of a shape sensor roll.

FIG. 3 shows an outline of an example of a conventional shape sensor roll, in which (a) is a partially cut perspective view and (b) is a cut side view.

[Description of Signs] (10) Core Shaft (11) Step for Forming Void (12) Inner Layer Material (13) Outer Layer Material (14) Sleeve (15) Sensor

──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Yuichiro Mizuno 1 in Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Yokohama Engineering Center of Ishikawajima-Harima Heavy Industries, Ltd. No. 1, Nakahara-cho, Ishikawajima-Harima Heavy Industries, Ltd., Yokohama No. 2 Factory (72) Inventor Osamu Kiuchi, No. 1, Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa, Japan Ishikawajima-Harima Heavy Industries, Ltd. 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa-shi Ishikawajima-Harima Heavy Industries, Ltd. 64 Amagasaki-shi, Amagasaki-shi, Japan Inside Kubota Amagasaki Plant (72) Inventor Akira Kosaka 64 Nishimukaijima-cho, Amagasaki City, Hyogo Prefecture Inside Kubota Amagasaki Plant (56) References JP-A-6-346141 (JP, A) JP-A-5-1352 (JP, A) JP-A 8-276209 ( JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 21/00-21/32

Claims (2)

(57) [Claims] A large number of sensors (1) are arranged along an axial direction.
5) An inner layer material (12) made of a steel pipe on the outer periphery of a core shaft (10) assembled at required intervals, and an outer layer material formed by coating a high-speed metal powder on the outside of the inner layer material by hot isostatic pressing. (13) The shape sensor roll characterized in that the multilayer material is fitted to form a thin sleeve (14) structure. 2. The composition range of the outer layer material (13) is C: 1.
4 to 2.4%, Si: 0.2 to 1.5%, Mn: 0.2
-1.0%, Cr: 10-18%, Mo: 0.5-1.
The shape sensor roll according to claim 1, wherein 0%, V: 6% or less, and the balance is substantially Fe.