JP3243181B2 - 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 arranged at least on one side of a rolling mill, particularly a hot rolling line, on an inlet side or an outlet side, and detects a shape of a rolled material to be rolled. It is.

[0002]

2. Description of the Related Art It is important to ensure a uniform shape of a rolled material rolled by a hot rolling mill in a hot rolling line in order to ensure product quality. In this case, the shape change of the rolling material during traveling cannot be visually determined while the rolling material is traveling, and the shape of the rolling material during traveling is inspected by the shape detecting device.

As shown in FIG. 7, this shape detecting device detects the tension of each part in the width direction of a rolled material (30) on a looper roll provided between finishing rolling stands (32) arranged in a line direction. The roll is a shape sensor roll (10) incorporating a detector configured as described above, and the shape of the rolled material is detected by measuring the tension distribution in the width direction of the rolled material (30).

Conventionally, as this shape sensor roll, there is a roll adopting a hollow split roll method as shown in Japanese Utility Model Publication No. 3-11691. As shown in FIGS. 8 and 9, a plurality of rotors (42) divided in the axial direction are fitted around the outer periphery of a hollow fixed shaft (40), and the fixed shaft is
A nozzle (44) for supplying compressed air from the hollow portion to the gap between the fixed shaft (40) and the rotor (42) is provided on the peripheral wall of the (40).
(40) are bored so as to be located at predetermined intervals in the axial direction and the circumferential direction, and furthermore, detection for air pressure measurement which is communicated with a detection pipe (46) at the upper and lower peripheral wall portions of the fixed shaft (40). A port (48) is provided, and the pressure difference of the air generated when the rotor (42) is displaced with respect to the fixed shaft is detected from the upper and lower detection ports (48) through the detection pipe (46), and the detected pressure difference of the air is detected. Is converted by the static electricity converter (50), and the tension distribution in the width direction of the rolled material (30) is obtained by an arithmetic unit (not shown).

Further, as shown in Japanese Utility Model Publication No. 3-11692, a rotatable shaft is used in place of a fixed shaft, and sensors are embedded in the outer peripheral surface of the shaft so as to correspond to each rotor. In some cases, the tension distribution in the width direction of the rolled material can be measured based on the value detected in (1).

[0006]

However, in the case of these conventional shape sensor rolls, the rotor on the roll surface has an axially multi-divided structure. Therefore, when the tension of the rolled material becomes high, the divided portions of the rotor are divided. Therefore, there is a possibility that the rolled material may be damaged.

For this reason, the applicant has considered using a sleeve having an axially integrated structure instead of the rotor having a multi-split structure. As shown in FIGS. 2 and 6, a shape sensor roll (10) using the sleeve (12) having an axially integral structure has a cutout portion parallel to the axis at a part of the outer periphery of the core shaft (20). (22) is formed, and the detecting portion (28) slightly protrudes from the surface of the notch (22) at a predetermined interval in the axial direction of the core shaft in the notch (22). A sensor (26), a sleeve (12) is fitted around the outer periphery of the core shaft (20), and a gap (22) is formed between the sleeve (12) and the cutout portion (22) of the core shaft (20). 24) is formed. The sleeve (12) bends into the gap (24) when subjected to the load of the rolled material (30), so the amount of bending deformation of the sleeve is detected by the sensor (26), and the tension distribution in the width direction of the rolled material is detected. Can be detected.

The sleeve has, for example, an outer diameter of about 190 mm,
Although it is a hollow tube having a length of about 2000 mm, in order to obtain a desired sensitivity with the sensor, it is necessary to reduce the wall thickness (typically, about 1 mm).
0 mm or less) so that an appropriate bending deformation is generated. When this thin-walled sleeve is manufactured by casting, there is a problem that cracks are likely to occur from the porosity as a starting point when the sleeve is fitted to the core shaft by shrink fitting due to the existence of porosity unique to the cast product.

In the case of a shape sensor roll used in a hot rolling line, the sleeve must be formed of a material having heat resistance, abrasion resistance, corrosion resistance, etc., in order to come into contact with a high-temperature rolled material. However, when the sleeve is fitted to the core shaft by shrink fitting, since a large residual stress remains in the sleeve after shrink fitting, it is desirable that the inner surface side of the sleeve has excellent toughness.

However, high hardness is desirable for wear resistance, but less desirable for toughness. Therefore, as shown in FIG. 6, the applicant made the inner layer (14) a pipe made of SCM440 steel having excellent toughness, and provided the outer layer of the inner layer (14) with a high-speed metallic material having excellent heat resistance, wear resistance and the like. A two-layered sleeve (12) in which the powder is coated as an outer layer (18) by HIP (Hot isostatic pressing) has been proposed (Japanese Patent Application No. Hei 6 (1994)).
-337425). The inner layer of this sleeve has excellent toughness, and the outer layer formed by HIP is dense without the porosity of a cast product, and has excellent heat resistance and abrasion resistance as characteristics inherent to high-speed metals. , High strength and the like.

However, in the production of the sleeve, HI
At the time of cooling after P sintering, or at the time of quenching heat treatment performed after HIP sintering, bending deformation occurs due to a difference in cooling rate depending on the position of the sleeve. However, if cutting or grinding is performed as it is, the thickness of the outer layer and the inner layer is increased. There is an inconvenience of causing variation. This bending deformation of the sleeve can be corrected by using a jig device after the sleeve is heated to about 700 ° C. in a heating furnace and then removed from the furnace.
Cutting before IP sintering and cutting after quenching and tempering
Bending correction is performed before (grinding) processing. However, since the deformed sleeve cannot be corrected to a perfect circle, only the thickness of the outer layer needs to be measured nondestructively in order to confirm whether the correction is appropriate. An ultrasonic thickness gauge is used as the measuring means, but since many types of components common to the inner layer and the outer layer are used, the irradiated ultrasonic wave penetrates through the thick part of the tube, and only the outer layer is used. Could not be measured.

An object of the present invention is to make the inner layer material a pipe of SCM440 steel having excellent toughness, and to use the outer layer material with heat resistance,
A composite sleeve for shape sensor rolls formed by coating a high-speed metal powder with excellent abrasion resistance etc. by HIP (Hot Isostatic Press) so that the thickness of only the outer layer of the sleeve can be measured. That is.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a core shaft having a cutout portion parallel to the axis on a part of the outer periphery, and a predetermined axially extending notch in the cutout portion. A sensor disposed at intervals and a cylindrical sleeve shrink-fit to the core shaft, wherein a sleeve loaded with a rolled material is formed between the notch of the core shaft. A shape sensor roll for detecting the shape of a rolled material by measuring a deflection generated in a gap with a sensor, wherein a sleeve is formed of Ni or C on an inner layer made of steel having excellent toughness.
An object of the present invention is to provide a shape sensor roll in which an intermediate layer of o is applied and a high-speed metal powder as an outer layer is formed by sintering on the intermediate layer by HIP.

[0014] The high-speed metal powder is preferably prepared by a rapid solidification method. The reason is that crystal grains are refined, and rapid cooling and solidification methods include an atomizing method, a melt spinning method, and a melt extraction method.

[0015]

In the sleeve having the above-mentioned structure, the ultrasonic wave radiated toward the outer layer of the sleeve is reflected by the Ni or Co plating layer formed between the inner layer and the outer layer. Therefore, after correcting the bending deformation of the sleeve, only the thickness of the outer layer can be measured nondestructively, and it can be confirmed whether the correction is appropriate. By appropriately correcting the bending deformation of the sleeve that occurs after sintering and heat treatment, and thereafter performing cutting or grinding, a thin-walled sleeve having substantially uniform outer and inner layer thicknesses over the entire length can be obtained. . The inner layer of a material with excellent toughness is provided with a substantially uniform thickness over the entire length, so that it does not crack when shrink-fitting the sleeve to the core shaft, and is integrated with the core shaft. It can be attached, and can sufficiently cope with thinning of the sleeve. In addition, the outer layer of a material having excellent heat resistance, abrasion resistance, corrosion resistance and high strength is provided with a substantially uniform thickness over the entire length, so that the life of the shape sensor roll can be extended. it can.

[0016]

1 and 2 show an embodiment of a shape sensor roll according to the present invention. Shape sensor roll (10)
Has a hollow core shaft (20) rotatably supported by bearings (not shown) at both shaft ends. The core shaft (20) has a cutout (22) having a flat surface parallel to the axial direction at a part of the outer periphery. Holes are formed at predetermined intervals in the notch portion (22), and a sensor (26) is embedded in each hole. A load cell can be used as a sensor to be used. The sensor (26) makes the detection unit (28) slightly protrude from the flat surface, and when a force acts on the detection unit (32), outputs a detection value according to the force and transmits it to the detector. be able to. When a load cell is used as a sensor, a voltage corresponding to a force is generated and measured by a detector. Sleeve (12)
Is a hollow thin-walled cylindrical body, the inner diameter of which is slightly smaller than the outer diameter of the core shaft (20), is shrink-fitted to the core shaft (20) and integrated to form a shape sensor roll (10). Although the illustrated core shaft has a hollow shape, it may be solid if there is a hole through which the sensor wiring is passed.

The sleeve (12) has an inner layer as shown in FIG.
(14) and an intermediate layer of Ni or Co formed on the inner layer
(16) and an outer layer (18) formed on the intermediate layer. SCM with excellent toughness as the material of the inner layer (14)
440 steel pipes can be used. The inner diameter of the pipe is finalized so that it can be slightly smaller than the outer diameter of the core shaft by machining after completion of the quenching and tempering heat treatment described below, so that the inner diameter of the pipe can be shrink-fitted to the core shaft of the sensor roll. Finished. The Ni or Co intermediate layer (16) has a thickness of about 0.1 to 1 mm, preferably about 0.5 to 0.7 m, with respect to the outer periphery of the inner layer (14) by plating or the like.
m. As the material of the outer layer (18), a high-speed metal having excellent heat resistance, abrasion resistance, strength, etc. is used, and a high-speed metal powder is sintered on the intermediate layer (16) by a known HIP device. Formed. HIP processing
Typically, a temperature of 1000 to 1200 ° C. and a gas pressure of 100
The reaction is performed under the conditions of 0 to 1200 kgf / cm ² and a time of ² to 3 hours. As a high-speed metal constituting the outer layer, for example, C: 1.0 to 2.4%, Si: 0.6% by weight%
Hereinafter, Mn: 0.6% or less, Cr: 0.5 to 20%, 2M
o + W: 1.5 to 45%, one or more of V, Ti, Nb, Ta in total 0.5 to 12%, and if necessary, Ni: 3.0% or less, with the balance being substantial Fe
Can be mentioned. In addition, C:
1.4 to 2.4%, Si: 0.2 to 1.5%, Mn: 0.2
1.0 to 1.0%, Cr: 10 to 18%, Mo: 0.5 to 1.0
%, V: 6% or less, with the balance substantially consisting of Fe.

The sleeve sintered by HIP is subjected to annealing, cutting, heat treatment of quenching and tempering, and grinding.
(Cutting) It is finished to a predetermined size through processing, but as described above, at the time of cooling after HIP sintering, and at the time of cooling of quenching,
Since bending deformation occurs due to a difference in cooling rate depending on the position of the sleeve, a bending correction operation is performed before cutting or grinding.

The straightening operation is performed by heating the sleeve in a heating furnace at 500 to 700 ° C., removing the sleeve from the furnace, and using a jig device. After the straightening, whether the thickness of the outer layer of the sleeve has become uniform over the entire length is measured by an ultrasonic thickness gauge. Since the sleeve of the present invention is provided with an intermediate layer of Ni or Co between the outer layer and the inner layer, when ultrasonic waves are irradiated toward the surface of the outer layer, the ultrasonic waves are reflected by the intermediate layer of Ni or Co. And the thickness of the outer layer can be measured. If the thickness of the outer layer exceeds a predetermined error range over the entire length, the bending correction work is performed again.

In this manner, after correcting the bending deformation, only the thickness of the outer layer can be measured nondestructively.
After confirming whether the correction is appropriate, cutting or grinding can be performed, and a thin-walled sleeve having substantially uniform outer and inner layer thicknesses over the entire length can be obtained.

[0021]

EXAMPLE A sleeve having a Ni plating layer provided between an inner layer and an outer layer was manufactured, and the hardness, the bonding state, and the thickness of the outer layer were measured. Fabrication of Sleeve The sleeve was fabricated with the following materials and conditions. On the outer surface of the SCM440 steel tube as the inner layer, Ni plating as the intermediate layer is formed to a thickness of 0.5 mm. In addition, the thickness of the pipe is an appropriate thickness in consideration of the machining allowance. A tube of Ni-plated SCM440 steel was placed in a HIP apparatus, and a high-speed metal (1.3% by weight, C1.3%,
Si 0.3%, Mn 0.3%, Cr 4.0%, Mo 5.0
%, V4.0%, W6.0%, Fe balance) is filled around the tube and then HIPed to form an outer layer having a thickness of 8 mm. HIP conditions are 1100 ° C and 1100kg
3 hours at f / cm ² .

The obtained sleeve is subjected to an annealing treatment (85
(0 ° C x 2 hours), heated and maintained at 1180 ° C for 2 hours in a vacuum furnace, then quenched by forced gas cooling using a normal temperature nitrogen gas of 4900 Torr as a refrigerant, and heated and held at 520 ° C for 10 hours to cool down Tempering was performed three times.

Outer layer thickness measurement The outer layer thickness of the obtained sleeve was measured. The outer layer of the sleeve was machined while measuring with a vernier caliper so as to have a layer thickness of 2 to 6 mm (see FIG. 4), and then the non-destructive outer layer thickness measurement was performed with an ultrasonic thickness gauge. Table 1 shows the results.

[0024]

[Table 1]

As can be seen from a comparison between the measurement result obtained by the caliper and the measurement result obtained by the ultrasonic thickness meter, the thickness of the outer layer of the sleeve is measured by the ultrasonic thickness meter with almost no error. This is because the Ni plating layer, which is an intermediate layer between the outer layer and the inner layer, reflects ultrasonic waves. For comparison, a sleeve without Ni plating was prepared, machined into a similar shape, and the thickness of the outer layer was measured with an ultrasonic thickness gauge. The ultrasonic wave penetrated the outer layer and the inner layer. And the layer thickness could not be measured.

Hardness Measurement The hardness distribution in the radial direction of the test sleeve was measured. In addition,
The thick part of the test sleeve is machined after quenching and tempering, and the outer layer is 4 mm, the Ni plating layer is 0.5 mm,
The inner layer was finished to a size of 4.5 mm, and the hardness measurement was performed on the finished sleeve. as a result,
As shown in FIG. 3, the hardness of the outer layer is Hs 67 to 71,
The hardness of the inner layer was Hs38. The outer layer has excellent wear resistance due to its high hardness, and the inner layer has excellent toughness as a characteristic inherent to the SCM material.

Observation of bonding state The interface between the outer layer of the sleeve of the present invention and the Ni plating layer, and Ni
Microscopic observation of the interface between the plating layer and the inner layer confirmed that each interface was completely welded and joined.

For examining the effect of the 45 degree shear compression test on the joining strength of the Ni plating layer,
A shear compression test was performed. The test piece was prepared in the following manner. SC with 0.5mm thick Ni plating on the end face
M440 (inner layer material) block (diameter 50 mm x length 50
mm) into a capsule (inner diameter 50 mm x length 100 mm), and a high-speed metal powder is placed on the Ni plating layer.
(Outer layer material), and after degassing and sealing, HIP treatment was performed under the same conditions as above. The obtained sintered body was cut obliquely by wire cutting, and as shown in FIG.
A test piece (outer diameter 10 mm x length 20 m) in which the Ni plating layer (17) between the material (5) and the outer layer equivalent material (19) has an inclination angle of 45 degrees
m) was prepared. For comparison, a comparative test piece without Ni plating was also prepared in the same manner. A compressive load was applied to these test pieces in the axial direction, and the compressive load and the deformation state of the test pieces were examined. Table 2 shows the results.

[0029]

[Table 2]

From the results shown in Table 2, it can be seen that the test piece in which the 45-degree inclined surface is plated with Ni is more firmly joined between the outer layer and the inner layer. This is considered to be because the Ni plating layer played a buffering role of pressure, and as a result, the strength of the entire test piece was improved. When Ni plating is applied between the outer layer and the inner layer as described above, it is advantageous in terms of bonding strength.

[0031]

According to the sleeve of the shape sensor roll of the present invention, the intermediate layer of Ni plating is provided between the inner layer and the outer layer, so that the thickness of only the outer layer can be measured by ultrasonic waves, and after sintering and quenching. In the operation of correcting the bending deformation of the sleeve that occurs later, it can be confirmed that the correction has been correctly performed. Therefore, when a subsequent cutting or grinding process is performed, it is possible to obtain a thin-walled sleeve in which the thickness of the outer layer and the inner layer is substantially uniform over the entire length, and to obtain high reliability in detecting the shape of the rolled material by the sensor. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shape sensor roll of the present invention.

FIG. 2 is a perspective view of a shape sensor roll.

FIG. 3 is a graph showing the relationship between the thickness of each layer of the sleeve and the hardness.

FIG. 4 is an enlarged sectional view of a sleeve used for measuring an outer layer thickness.

FIG. 5 is a front view of a test specimen.

FIG. 6 is a cross-sectional view of a shape sensor roll using a two-layered sleeve.

FIG. 7 is a schematic view of a rolling stand.

FIG. 8 is a perspective view of a conventional shape sensor roll.

FIG. 9 is a sectional view of a conventional shape sensor roll.

[Explanation of symbols]

 (10) Shape sensor roll (12) Sleeve (14) Inner layer (16) Middle layer (18) Outer layer (20) Core shaft

Continued on the front page (72) Inventor Hajime Ishii 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Yokohama Engineering Center, Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Hideo Fujita 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture No. Kubota Hirakata Factory (72) Yoshio Katayama Inventor 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Inside Kubota Hirakata Factory (56) References JP 8-184429 (JP, A) JP JP-A-61-18836 (JP, A) JP-A-59-85930 (JP, A) JP-A-8-83503 (JP, A) JP-A-4-166734 (JP, A) JP-A-3-59430 (JP) , A) Jikken Hei 3-11692 (JP, Y2) Jigyo Hei 3-11691 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01B 21/20 G01B 7/28

Claims (2)

(57) [Claims] 1. A notch (22) in a part of the outer periphery parallel to the axis.
A core shaft (20), a sensor (26) arranged at a predetermined interval in the notch at an axial direction, and a cylindrical sleeve (12) shrink-fitted to the core shaft. A gap (24) is formed between the sleeve (12) and the notch (22) of the core shaft (20),
By measuring the deflection generated when the sleeve (12) receives the load of the rolled material (30) with the sensor (26), the rolled material (30)
A shape sensor roll adapted to detect the shape of the inner layer (1) made of steel having excellent toughness.
4), an intermediate layer (16) of Ni or Co is formed thereon, and a high-speed metal powder as an outer layer (18) is sintered and formed by hot isostatic pressing on the intermediate layer. roll. 2. The outer layer (18) of the sleeve (12) is formed by sintering a high-speed metal powder prepared by rapid solidification by hot isostatic pressing, and the outer layer (18) has a hardness of Hs60. ~ 9
The shape sensor roll according to claim 1, wherein the number is 5.