JPH03169412A - Base material for rolled plate roll, rolled plate roll and its manufacture - Google Patents

Abstract

PURPOSE:To obtain homogeneity of a weld zone to a base material by electron- beam-welding a joining part between the base materials for rolled plate rolls bent in the shape of a flat roll without using filler material. CONSTITUTION:In the base materials 1, 2 for the rolled plate rolls, metallic plate is made up in the shape of a roll and the joining sides 1a, 2a are formed flat. The groove parts 1b, 2b of this base material are welded by electron beams without using filler material. In this way, the base material and the weld zone become homogeneous and problems caused by the heterogeneity between them are prevented from generation and availability in rolling, etc., a steel plate is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a plate-wound roll in a processing roll used for rolling processing of steel plates and the like.

[Conventional technology]

Processing rolls such as rolling rolls are made to withstand wear, deformation, etc. due to the enormous loads they receive during use, and are usually made to withstand wear and deformation due to the enormous loads they receive during use. Named according to law.

Therefore, plate-wound rolls can be formed relatively easily and are inexpensive compared to other rolls, and are usually manufactured in the following manner.

That is, an appropriate metal plate is cold or hot bent into a roll shape using an appropriate bending method, and the bending start and end ends of the roll base material are butted together with the leading edges, and carbon dioxide gas or carbon dioxide gas is applied using a commercially available welding material. After being joined by argon gas welding or submerged arc welding, etc., they are properly heat treated and fixed.

[Problem to be solved by the invention]

However, the joints of plate-wound rolls manufactured in the above manner often have defects such as pinholes, and the welding material is different from the roll base material, so welding is performed after welding. The effect of heat treatment, that is, the hardness and structure of each roll differs, and as a result, there are problems such as unevenness on the plate roll body and the welded part during use, making it impossible to use it as a rolling roll, for example. .

Therefore, the problem to be solved by the present invention is to provide a sheet-wound roll that is free from the defects and problems described above.

[Means to solve the problem]

The present invention has been made for the purpose of solving the above-mentioned problems, and the structure of the base material for the plate roll is that the metal plate is formed into a roll shape with flat joint sides, or It is characterized by bending a plate into a half-roll shape with both ends flat, and joining the two together to form a roll. A joint of a base material for a roll-shaped plate roll with flat sides, or a joint where a metal plate is bent into a half-roll shape with flat ends and the two are joined into a roll. are welded using an electron beam or the like to form a welded part of the same quality as the roll base material, and this is formed into a predetermined cylindrical shape. The method is to bend a metal plate into a roll-shaped plate roll base material with flat joint sides, or to bend a metal plate into a half-roll shape with both ends flat. are joined into a roll, and the joint is welded using an electron beam or the like to form a welded part of the same quality as the base material for the roll. After forming this into a predetermined cylindrical shape, it is heat-treated by high-frequency induction heating, etc. Its main feature is that it has a uniform hardened layer and hardness over the entire area, including the welded area.

In other words, in plate rolls whose joints are welded using conventional welding methods, the base metal and the welded part are made of different materials, resulting in the defects and problems described above.In order to solve this problem, The joint part must be made of the same material as the base material,
With conventional welding methods, it is almost impossible to select a weld bar made of the same material as the base metal.

Therefore, the inventor of the present invention conducted research with the aim of solving the above-mentioned problems, and found that in order to obtain a welded part of the same quality as the base metal, the base metal at the joint surface must be melted using an electron beam or the like and fused. The inventors have learned that this is a good idea, and have accomplished the present invention.The outline of the invention is as follows.

The metal plates used in the present invention include S50C,
Examples include steel plates such as SCM440 and HITEN80, and these plates are processed using a three-point roll method, press bending, etc.
Bending the above roll base material. In addition to steel plates, metal plates include nickel alloy plates and non-ferrous metal plates.

Next, the joint surfaces of the base material for rolls are joined using an electron beam or the like, but in this case, the flat surface of the base material for rolls is maintained horizontally and vertically without any processing. , it is necessary to stabilize the welding process. After welding, it is only necessary to correct the roundness to a predetermined degree, including removing distortion.

Since the material of the bonded portion of the plate-wound roll obtained in this manner is the same as that of the base material, the above-mentioned problems are solved.

Further, when the surface of the plate-wound roll is used after being subjected to a surface treatment such as plating or thermal spraying, it is necessary to form a uniform hardened layer on the roll surface and to make it uniform in hardness.

Furthermore, when manufacturing a clad plate-wound roll using clad material, the surface layer of the clad roll must be welded using the same material, so the entire surface should be welded by electron beam welding, etc. Alternatively, only the surface layer may be welded by electron beam welding, and the joint portion of the back layer may be joined by carbon dioxide gas, argon gas welding, or the like.

〔Example〕

Next, the plate-wound roll of the present invention will be explained with reference to the drawings.

FIG. 1 is a side view of an example of the base material for the plate-wound roll of the present invention, and FIG.
The figure is a side view of another example, FIG. 3 is a diagram of the base material shown in FIG. 1 being electron beam welded, FIG. 4 is a perspective view of a completed plate roll, and FIG. 5 is a plate of the present invention. A chart showing the cross-sectional hardness of the base metal of a wound roll and the welded part. FIG. 6 is a chart showing the cross-sectional hardness of the base metal of a plate-wound roll welded with a commercially available welding material and the welded part.

In Figure 1, 1 is a roll of steel plate made of 340C, 30m thick, and 10QQm wide, with a diameter of about 600m.
For example, 3
This is a base material for a plate-wound roll that has been bent using a spot roll method, and the joint portion is formed into an extremely narrow groove portion 1b, which is the portion to be welded. Here, the joints at both ends are polished after cutting the steel plate so that beveling does not need to be performed after bending, but beveling may be performed after bending.

In addition, in Fig. 2, 2 is a half-rolled steel plate similar to the above with a diameter of about 600 un, and both ends are flat 2a, 2a.
This is a base material for a plate roll that has been bent by press bending, etc., as shown in the shape I, and this base material 2 is made into a roll shape by joining two pieces together. When welding, the opposing end surfaces are formed into extremely narrow grooves 2b. The rest is the same as base material 1.

3 is a vacuum chamber of an electron beam welding device, 4 is an electron beam gun movably disposed in the vacuum chamber 3, and 5 is a sample mounting table installed in the vacuum chamber 3, on which the base material is placed. 1
Or 2 is placed and the groove is welded, but base material 1
The case of welding will be explained as follows.

First, the base material 1 is temporarily fastened on the inside so that the tip portion 1b thereof forms an extremely narrow gap, and then set on the mounting table 5 with the groove portion 1b facing upward, and the vacuum chamber 3 is moved by the vacuum pump 6.
Welding is performed by creating a high vacuum state inside the interior, operating the electron beam gun 4, and moving the electron beam along the groove while emitting it to the groove 1b. When the groove 1b collides with the groove tb, the groove 1b generates heat and melts due to the impact, and welding is performed.

Therefore, the above electron beam welding has the advantages that the welded part is not contaminated by the atmosphere, has extremely deep penetration, has a narrow heat-affected zone, and has little distortion. Since no welding studs are used, the joint is finished to the same quality as the base metal, and there are no pinholes in the weld, resulting in an extremely high quality product compared to conventional products. In this sense, the present invention may use welding using laser or plasma beam instead of electron beam.

The base metal 1 whose groove portion 1b has been welded in this manner is straightened into a predetermined perfect circular shape, including removing the distortion caused by welding, and then heat treated by high frequency induction heating or the like. This results in a plate-wound roll having a hardened layer and hardness with a uniform surface. Note that the heat treatment may be performed by gas heating.

That is, after welding, normalizing is performed at 830 to 870°C,
The structure of the welded part was adjusted and the shape was corrected to a perfect circle, and then induction hardening was performed at about 900 ° C.
The base metal and the welded part had almost the same hardness, and no pinholes were observed in the welded part.

The table in Figure 5 is a measurement table of the cross-sectional hardness of the base metal and the welded part after the plate-wound roll of the present invention is welded with an electron beam and subjected to heat treatment. It turns out that they are almost the same.

In addition, in order to compare the welded part of the plate-wound roll of the present invention with that of a conventional plate-wound roll, the cross-sectional hardness of the welded part of the plate-wound roll whose leading end was welded using a commercially available welding material is shown in Fig. 6. Shown in the table. In other words, because commercially available welding materials contain carbide in the form of ferroalloy to increase hardness, it is clearly evident that the hardness of the base metal and welded part is different even if heat treatment is performed after welding. It can be seen that this causes inconvenience in use. This phenomenon occurs because there are carbides contained in the welding material in the weld zone, but there are no carbides in the base metal.As shown in the table in Figure 6, if the base metal is left quenched, The hardness of the welded part is higher than that of the welded part, and when tempered,
It is clear that the relationship is reversed.

The plate roll of the present invention can be used as described above, but the surface is further coated with chrome plating, w
The hard coating layer may be formed by spraying a cermet material such as -c-co, or a ceramic material such as alumina or chromium oxide.

Further, a clad material may be used as the base material.

In this case, the joints on the surface layer of the plate roll base material formed from the clad material are welded using an electron beam, and the joints on the back layer are welded by carbon dioxide gas welding, argon gas welding, submerged arc welding, etc. Then, only the surface layer portion may be formed to have the same quality as the base material and the joint portion.

〔Effect of the invention〕

The present invention is as described above, and the joint portion of the base material for a plate-wound roll, which is bent and formed into a flat roll shape, is connected with an electron beam.
Or, because welding is performed without using a welding material using a laser or plasma beam, the base metal and the welded part are of the same quality, resulting in problems caused by the difference in quality between the base metal and the welded part seen in conventional technology. has been solved and is extremely useful for rolling of steel plates, etc. Also, when welding, one part of the metal plate
Since the joint sides are shaped to be flat during the ridge processing, it is easy to obtain precision in the groove, and furthermore, it is easier to control the beam irradiation, improving workability and welding accuracy.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of the base material for the plate-wound roll of the present invention, and FIG.
The figure is a side view of another example, Figure 3 is a diagram of the base material shown in Figure 1 being electron beam welded, Figure 4 is a perspective view of a completed plate roll, and Figure 5 is a plate of the invention. A chart showing the cross-sectional hardness of the base metal of a wound roll and the welded part. FIG. 6 is a chart showing the cross-sectional hardness of the base metal of a plate-wound roll welded with a commercially available welding material and the welded part. 1, 2... Base material for plate rolls. la, 2a...
Flat part, lb, 2b... Groove part Fig. 2 Fig. 3 Fig. lb (also 1! 2b) 1 (also 1 go 2) Size/Gimm

Claims (1)

[Scope of Claims] 1. A base material for a plate-wound roll, characterized in that a metal plate is formed into a roll shape with flat joint sides. 2. A base material for a plate-wound roll, characterized in that a metal plate is bent into a half-roll shape with both ends flat, and when the two are joined together, it becomes a roll shape. 3 A metal plate is bent into a roll-shaped base material for a rolled plate roll with flat joint sides, or a metal plate is bent into a half-roll shape with both ends flat, and the two are rolled. 1. A plate-wound roll characterized in that a welded portion of the same shape as the base material for the roll is formed by welding with an electron beam or the like, and the welded portion is formed into a predetermined cylindrical shape. 4. Bending a metal plate into a roll-shaped plate roll base material with flat joint sides, or bending a metal plate into a half-roll shape with flat ends, and rolling the two. The welded portion is welded using an electron beam or the like to form a welded portion of the same quality as the roll base material, which is formed into a predetermined cylindrical shape, and then heat treated using high frequency induction heating or the like.
A method for manufacturing a plate-wound roll characterized by providing a uniform hardened layer and hardness throughout the entire area including the welded part. 5 The joining part of a metal plate is a roll-shaped base material with flat joint sides, or the metal plate is bent into a half-roll shape with both ends flat, and the two are joined into a roll shape. Then, the joint is welded with an electron beam or the like to form a welded part of the same quality as the roll base material, and after forming this into a predetermined cylindrical shape, it is heat treated by high frequency induction heating etc. to form a welded part including the welded part. A method for manufacturing a board-wound roll, characterized by providing a uniform hardened layer and hardness throughout, and forming a hard coating layer on the surface. 6. The manufacturing method according to claim 5, wherein the hard coating layer is formed by chrome plating, thermal spraying of a cermet material such as W.C-CO, or a ceramic material such as alumina or chromium oxide. 7 A base material for plate rolls in which clad material is formed into a roll shape with flat joint sides, or a clad material is bent into a half roll shape with both ends flat, and the two are rolled into a roll shape. 1. A method for manufacturing a plate-wound roll, which comprises welding the joints of the surface layer parts of the base material for the plate-wound roll by electron beam welding or the like, and then forming the base material into a predetermined cylindrical shape.