JPH02247016A - Roller for shaped steel straightening machine - Google Patents

Abstract

PURPOSE:To offer a straightening ring having a long service life by welding the outer peripheral part of an inner layer integrally with the inner peripheral part of the inner layer to form the inner layer and forming the inner peripheral part of the inner layer from high hardness and tough material. CONSTITUTION:The inner layer 3 of tough material is welded integrally with the outer layer 2 of wear resisting material to form the straightening ring 1. The straightening ring 1 is mounted on a roll shaft through the key freely touchably and detachably to make up a roller for a shape steel correcting machine. The outer peripheral part 4 of the inner layer welded to the outer layer 2 and the inner peripheral part 5 where a key groove 6 is formed are welded integrally to form the inner layer 3. The inner peripheral part 5 of the inner layer is formed from high-hardness and tough material capable of preventing the key groove from partial plastic deformation through the contact with the key. Thus, the roller for the straightening machine long in service life and high in profitability can be offered.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a roller for a shaped steel straightening machine for straightening the cross-sectional shape of a shaped steel.

(Prior Art) Since a section steel is required to have a cross-sectional shape in which the web and the flange are perpendicular to each other, a straightening machine is used to remove distortions (for example, warping, bending, and waving) during rolling. The main method for straightening shaped steel is to repeatedly bend the product.
Generally, a roller straightening machine, schematically shown in FIG. 2, is used. The roller straightening machine includes pinch rollers 35, 35
Three to five straightening machine rollers 20 are arranged alternately between the upper and lower sides, and usually one of the upper and lower rollers is driven, and the other is driven by the shaped steel to be straightened fed by the pinch rollers 35 and 35. be followed. Although not shown, guide rollers for guiding the material to be straightened are usually provided between the pinch rollers 35, 35 and the straightening machine rollers 20 located at both lower ends.

3 and 4 show the state in which the surface angle between the web and flange of the H-beam 24 is corrected by the roller straightening machine. The straightening machine roller 20 is a straightening ring 2
2.22 and a spacer ring 23 are removably attached to the roll shaft 21 via a key 28 and fixed to the roll shaft 21 with a nut 31 via a disc ring 30. In addition to the above-mentioned rollers for straightening machines, there is also one having a structure in which the straightening ring, spacer ring, etc. are attached and fixed to the outer peripheral surface of a sleeve, and the sleeve is fixed to a roll shaft.

The dimension adjustment in the width direction of the straightening roller 20 is carried out by installing a spacer ring 23 having an appropriate width depending on the dimension between the inner surfaces of the flanges of the H-section steel between the straightening rings 22 and 22. On the other hand, vertical dimension adjustment is performed by adjusting the distance between the roll axes. The roller for straightening machine is used for straightening H-section steel of various sizes by performing the above-mentioned dimensional adjustment.

Further, the orthodontic ring 22.22 is formed by welding and integrating an outer layer 25 made of a wear-resistant material such as Ni grain material or high chromium cast iron material, and an inner layer 26 made of a tough material such as Critile cast iron material. There is.

(Problem to be Solved by the Invention) As described above, the correction ring 22 is attached to the roll shaft 21 with the key 2.
It is attached via 8. FIG. 5 is an enlarged view of the key locking portion of FIG. 4. The side surface 29 of the keyway 27 formed in the inner layer 26 is repeatedly subjected to impact loads each time the roller rotates or stops. Therefore, as shown by the dotted line in the figure, there is a problem in that the keyway side surface 29 is partially plastically deformed and spread out in the circumferential direction, that is, so-called "settling" is likely to occur. Furthermore, when the above-mentioned sagging occurs,
Since "backlash" is generated between the inner circumferential surface of the inner layer and the roll shaft, the inner circumferential surface of the inner layer is worn, the inner diameter dimension increases, and the "backlash" is promoted.

In this case, it is conceivable to form the inner layer with the same wear-resistant material as the outer layer, but since the wear-resistant material has high hardness, it can prevent the above-mentioned fatigue, but due to the impact load that repeatedly acts on the keyway as described above, Cracks tend to occur at the corner between the side of the keyway and the bottom, and since cranks develop quickly in high-hardness materials, chips on the side of the keyway may fall off or even crack the ring itself. Therefore, it is difficult to apply high hardness materials.

The present invention has been made in view of the above-mentioned problems, and there is no fear of cracks occurring on the side surface of the keyway, and furthermore, the occurrence of sagging of the keyway and expansion of the inner diameter dimension is prevented. The purpose is to provide an orthodontic ring with a long service life.

(Means for Solving the Problems) In order to achieve the second object, the present invention provides a straightening ring 1 in which an inner layer 3 made of a tough material is welded to an outer layer 2 made of a bending wear material. In a roller for a shaped steel straightening machine that is detachably attached to a shaft via a key, the inner layer 3 has an inner layer outer circumference 4 welded to the outer layer 2 and an inner layer inner circumference 5 in which a keyway 6 is formed. - The inner circumferential portion 5 of the inner layer is made of a high hardness and tough material that can prevent the keyway 6 from being partially plastically deformed due to the abutment of the key. It is structured as follows.

(Function) In the present invention, the inner layer of the orthodontic ring is integrally formed by welding the outer circumferential portion of the inner layer welded to the outer layer and the inner circumferential portion of the inner layer in which the keyway is formed. Since the inner periphery of the inner layer is made of a highly hard and tough material, the inner periphery of the inner layer is free from partial plastic deformation of the keyway (so-called sagging) and expansion of the inner diameter dimension of the inner periphery of the inner layer (so-called , rattling) can be provided. Furthermore, since the high hardness and toughness material has wear resistance as described above and also has appropriate toughness, the inner peripheral portion of the inner layer can also have toughness that can prevent the occurrence of cranking on the side surface of the keyway. can.

The inner peripheral portion of the inner layer is preferably formed by casting of a highly hard and tough material having a surface hardness of Hs45 to Hs55. This is because the inner peripheral portion is required to have not only wear resistance but also toughness as described above.

On the other hand, since the outer circumferential portion of the inner layer is formed of a strong material, even if a crank occurs in the inner circumferential portion of the inner layer, its progress can be prevented.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross section perpendicular to the axial direction of a correction ring 1 according to an embodiment of the present invention. The orthodontic ring 1
As mentioned above, the H Used for straightening section steel. In this embodiment, the structure of the straightening machine roller to which the straightening ring l is attached is the same as that of the conventional example described above.

The straightening ring 1 is formed by integrally welding an inner layer 3 to an outer layer 2 whose outer peripheral surface is in contact with the H-shaped steel and which straightens the H-shaped steel. Further, the inner layer 3 is formed by welding and integrating an inner layer outer circumferential portion 4 that is welded to the inner circumferential surface of the outer layer 2 and an inner layer inner circumferential portion 5 in which a keyway 6 is formed.

The inner circumferential portion 5 of the inner layer is cast from a highly hard and tough material, and the high hardness and tough material is inserted into the keyway 6 by contact with the key.
It has both abrasion resistance that prevents the occurrence of "settling" and toughness that prevents cracks from forming on the side surfaces of the keyway 6, and its surface hardness is Hs45 to Hs55. The high hardness and toughness material may have, for example, the following composition (unit:
(wt%) high-alloy ductile cast iron material can be exemplified.

C: 3.0-3.8%, Cr: 0.2-0.
6%Si: 1.8~2.6%, Mo:0.1~
0.6%Mn: 0.3-0.8%, Mg:
0.03-0.15% Ni: 1.5-2.5%,
The remaining portion is substantially Fe.For the inner layer outer peripheral portion 4, a relatively inexpensive cast material with a surface hardness of about 35 to 45 Hs is used to prevent cracks from developing in the keyway 6. be done. Examples of the casting material include ductile materials having the compositions (unit price, weight %) shown below.

C: 3.0-3.8%, Cr: 0.2% or less, Si: 1.8-2.6%, Mo: 0.2%
Below, Mn: 0.3-0.8%, Mg: 0.
03 to 0.15%Ni: 0.5 to 1.0%, the remainder being substantially Fe.The outer layer 2 is cast from a wear-resistant material as in the past, and its surface hardness is usually 1Is65 to 8.
It is set to 0. Examples of the wear-resistant material include high hardness materials such as Ni grain material and high chromium cast iron material.

As a method for manufacturing the above-mentioned orthodontic ring 1, for example,
The following method is available and is suitable for carrying out the present invention because it is simple.

First, after casting the outer layer material molten metal into a centrifugal force casting mold by the centrifugal force casting method, when a part of the inner circumferential surface of the outer layer material is in an unsolidified state, the inner layer outer circumferential member is placed on the inner circumferential surface of the outer layer material. Pour molten metal. Furthermore, when a part of the inner circumferential surface of the inner circumferential member is in an unsolidified state, the inner circumferential member molten metal is cast into the inner circumferential surface of the outer circumferential member. By the above method, the outer layer, the outer circumferential portion of the inner layer, and the inner circumferential portion of the inner layer are welded and integrated to obtain an orthodontic ring material.

During the above casting process, the casting thickness of the inner periphery of the inner layer is such that the thickness of the inner periphery after finishing the ring material is 1.2 to 2 times the depth L of the keyway. It is desirable to do so. If the thickness of the inner periphery is not sufficient, the inner surface of the keyway cannot be backed up sufficiently by the high hardness and toughness material, and the impact load acting on the keyway may cause the keyway to "sag" or crack. is more likely to occur. On the other hand, when the thickness is too large, a large amount of expensive high-alloy material is used, which is not economical.

After machining, the straightening ring material is usually subjected to strain relief heat treatment to remove casting residual stress, and then finishing processing is performed to form the straightening ring.

In this embodiment, an H-beam steel having a web and a flange is to be straightened, but the object to be straightened by the present invention is not limited to this, and may be a shape steel such as a channel steel or an angle steel.

Below, the outer diameter is 840 mm, the inner diameter is 400 mm, and the thickness is 40 mm.
A straightening ring made of ceramic and having a key groove depth of 20 mm and a groove width of 50 mm will be described with reference to specific examples. As a comparative example, an orthodontic ring was also manufactured using the same outer layer material as in the example and ductile as the inner layer material.

(2) The Ni-grain material shown in Table 1 was used as the molten outer layer material, and was cast into a mold rotating on a centrifugal casting machine. At this time, a coating agent made of resin sand is applied to the inner surface of the mold to a thickness of 3 mm, and the rotation speed of the mold is GNo.
, and the pouring temperature was 1310'C.

(2) After pouring the molten metal for the outer layer material, when a part of the inner circumferential surface of the outer layer was in an unsolidified state, the molten metal for the inner outer circumferential material made of the ductile material shown in Table 1 was cast onto the inner circumferential surface of the outer layer.

■ After pouring the molten metal for the inner layer outer peripheral member, if a part of the inner peripheral surface of the outer peripheral portion of the inner layer is not solidified, pour the molten metal for the inner layer inner peripheral member made of the high alloy ductile material shown in Table 1 onto the inner peripheral surface of the outer peripheral portion. is.

(Next page) ■ After each of the above components had completely solidified, the mold was dismantled, and the orthodontic ring material was taken out and machined.

■ After machining, heat treatment was performed at 500°C for 10 hours to remove distortion. Thereafter, finishing was performed to obtain a correction ring.

■ The formed thickness and surface hardness of each part of the product straightening ring were as shown in Table 2. As a comparative example, the hardness of each part of a correction ring formed by welding from an outer layer made of the same material and an inner layer made of ductile material as in the previously described Examples is also shown.

Table 2 (Note) The keyway depth in the example is 20 mm.

■ The straightening ring obtained as described above was assembled on a roll shaft together with a spacer ring to obtain a roller for a straightening machine. The roller was assembled into a straightening machine and used for straightening work of H-beam steel.

When the maximum value of the groove width of the keyway was measured after straightening the H-type steel by 300,000 tons, the groove width, which was originally 50 mm, was 50.04 m + n in the case of this example, whereas it was 52 m + n in the comparative example. .5 mm, and the effect of preventing the key groove of the inner circumferential portion of the inner layer of this example from becoming sag was recognized.

(Effects of the Invention) In the present invention, the inner layer of the orthodontic ring is composed of an outer circumferential portion of the inner layer and an inner circumferential portion of the inner layer, and the inner circumferential portion of the inner layer is made of a highly hard and tough material. It has wear resistance that can prevent the expansion of the surface and the occurrence of partial plastic deformation (so-called sagging) of the keyway due to key contact, as well as toughness that can prevent the keyway from cranking. be able to.

Further, since the outer circumferential portion of the inner layer is formed of a strong material, even if a crank occurs in the inner circumferential portion of the inner layer, its progress can be prevented.

Therefore, it is possible to provide a straightening ring with an extremely long service life that does not easily cause settling or cranking in the inner layer even when used for a long period of time, so that rollers for straightening machines incorporating this ring also have a long service life. It can be made highly economical.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a straightening ring according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an outline of a roller straightening machine, FIG. 4 is a sectional view taken along the line AA of the correction roller shown in FIG. 3, and FIG. 5 is a partially enlarged sectional view of FIG. 4. ■... Orthodontic ring, 2... Outer layer, 3... Inner layer,
4: Inner layer outer circumferential portion, 5: Inner layer inner circumferential portion, 6: Keyway. Figure Figure 1) I+. Figure A+

Claims (2)

[Claims] (1) A straightening ring (1), in which an outer layer (2) made of a wear-resistant material and an inner layer (3) made of a strong material are welded and integrated, is removably attached to the roll shaft via a key. In the mechanical roller, the inner layer (3) has an inner layer outer peripheral portion (
4) and an inner layer inner circumferential portion (5) in which the keyway (6) is formed are integrally welded, and the inner layer inner circumferential portion (5)
) is a roller for a shaped steel straightening machine, characterized in that it is made of a high hardness and toughness material that can prevent the key groove (6) from being partially plastically deformed by contact with the key. (2) The surface hardness of the inner periphery of the inner layer is 45 to 55 in Shore hardness.
The roller for a shaped steel straightening machine according to claim (1), characterized in that: