JPH09300084A - Hollow roll barrel member and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the plate wound type hollow roll barrel member not having problem of hardness unevenness of a joined part, etc. SOLUTION: In the member for the hollow roll barrel having a joined part 5, in which a cylindrical body 4 is made by joining/closing straight end sides 2, 3 of a cylindrical formed body 1 or two semicircular formed bodies 1', 1' of metal plate each other, by forming the part at least at the outer face side of the joined part 5 with liquid phase diffusion joining method, the solidified structure by welding is not exposed on the surface of joined part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a body member for providing a plate winding type roll having a hollow body used for manufacturing a metal plate and the like with excellent surface characteristics, and , A method for advantageously manufacturing a fuselage member of said construction.

[0002]

2. Description of the Related Art A large number of rolls are used in the production and processing processes of sheet materials such as steel plates and sheet materials such as plastic films. These rolls have a hollow body, except for those that are used under a particularly high load, such as rolling rolls and leveler rolls. Hollow rolls.

However, the body of the hollow roll is usually manufactured by a centrifugal casting method, a forging method, or a plate winding method. Among them, the plate winding method is far superior to other methods in terms of dimensional compatibility, homogeneity of material, and low cost, but it is derived from the manufacturing process of rolling and joining metal plates. Then, the product always has a joint.

Conventionally, various weldings have been used as the joining means in the above-mentioned plate winding method. Even if the welding modes are different, the welded material or the material to be welded itself is heated and melted and solidified to join the welded portion. Have a common history of being formed. For this reason, various measures have been taken to make the properties of the welded portion not much different from the base metal portion.

However, for the above purposes, for example,
Even when welding with specifications that make the composition of the welded part the same as other parts is performed, a situation peculiar to the solidification structure such as the occurrence of local composition unevenness due to the formation of proeutectoid ferrite bands in the solidification process occurs, This is not completely eliminated even by heat treatment after welding, etc., the difference in quenching hardness due to the above compositional unevenness, and consequently uneven wear, or the unevenness of the skin due to the difference in sensitivity to polishing or blasting. It may occur subtly, but may have an unfavorable effect on the surface of the sheet material in contact with the roll.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates the above-mentioned problems relating to the joint portion of the hollow roll body member manufactured by the plate winding method. An object of the present invention is to provide the hollow roll body member and the manufacturing method thereof.

Therefore, the inventors of the present invention have aimed to form a joint portion in the plate winding method so as not to generate a solidified structure that causes the above-mentioned problems, and have studied a realization measure. Examples of joining means that do not produce a solidified structure include a gas pressure welding method, a liquid phase diffusion welding method, a solid phase diffusion welding method, a friction pressure welding method, and an ultrasonic welding method. Among them, the liquid phase diffusion bonding method is a preferable method capable of satisfying a well-balanced bonding strength, structural continuity, dimensional accuracy, and workability required for the roll body. However, this liquid phase diffusion bonding method is a bonding means that has been used for bonding a small area of at most 100 cm ² , and it is similar to the bonding part of a plate winding hollow roll.
It seems that it is difficult to apply it to the joining of large area which can reach 1000 cm ² in terms of equipment scale and workability.

Here, the inventors have realized that the problem of the solidification structure of the joint is limited to the surface side of the roll, and only the portion on the roll surface side of the joint is present. The present invention has been achieved on the idea of forming a film by a liquid phase diffusion bonding method.

[0009]

That is, the constitution of the hollow roll body member of the present invention made for the purpose of solving the above-mentioned problems is as follows. A member for a hollow roll fuselage having a joint portion, which is formed by closing the linear end sides of the molded body by joining to form a cylindrical body,
It is characterized in that at least a portion of the joint portion on the outer surface side of the cylinder is formed by a liquid phase diffusion joining method.

In the liquid phase diffusion bonding method referred to in the present invention, the portion to be joined in which an insert material having a melting point lower than that of the base material is interposed between both base material surfaces to be joined, is inserted under pressure. By heating to a temperature not lower than the melting point of the base material and lower than the melting point of the base material to melt only the insert material, the active components in the insert material are diffused and assimilated into the base materials on both sides and joined. Is the way. That is, although the insert material melts, its solidification occurs isothermally mainly with the rise of the melting point of the insert material due to the diffusion escape of the above-mentioned active ingredient, so that it usually occurs with the cooling of the system. No segregation such as solidification process does not occur, the heating temperature is remarkably lower than that of the welding method, and the change of the base metal structure in the vicinity due to the heat effect is also slight, so the joint is It is formed in a state where there is almost no difference in properties from the base metal part including the affected part.

Therefore, according to the above-mentioned constitution of the present invention, the joint portion including the problem such as the solidification structure is not exposed on the body surface of the hollow roll manufactured by the plate winding method, and
Since the liquid phase diffusion bonding method only needs to be applied to a necessary small area on the outer surface side of the body, the liquid phase diffusion bonding method can be carried out without restrictions on the equipment scale and workability, thus solving the above problems.

Here, it is preferable to set how much of the outer surface of the body is to be the joint by the liquid phase diffusion bonding method according to the application of the roll. In other words, in the case of a roll that is used without re-polishing, it is sufficient that the cutting allowance during roll production is secured, so the liquid phase diffusion from the outer surface to a depth of about 3 mm. It only has to be joined. On the other hand, for applications in which re-polishing is repeated, for example, it is advisable to provide a liquid phase diffusion bonding portion of about 15 mm for a cutting allowance of 10 mm in total. Also, from the viewpoint of equipment scale and workability, 1
For roll bodies of ~ 2 m width, up to about 15 mm is a range where liquid phase diffusion bonding can be easily performed.

Next, in principle, the joining means for the portion which is not liquid phase diffusion joined in the joining portion is arbitrary,
In terms of ensuring the strength of the entire joint, avoiding excessive heat effects on the joint formed by the liquid phase diffusion bonding method, and reducing the cost, the submerged arc welding method, carbon dioxide arc welding method, etc. Is recommended.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a joint portion aspect of a hollow roll body member of the present invention, FIG. 2 is a cross-sectional view of a cylindrical molded body of a metal plate, and FIG. 3 is a butt of two semi-cylindrical molded bodies. FIG. 4 is a cross-sectional view showing a state in which the edges to be joined are adjusted with respect to the metal plate before forming, and FIG. 5 is a cross-sectional view of the hollow roll body member of the present invention in the direction crossing the joining line on the outer surface side of the joining portion. It is a chart showing a surface hardness distribution.

That is, in the hollow roll body member of the present invention, the joining portion 5 of the cylindrical body 4 formed by joining the straight end sides 2 and 3 of the cylindrical molded body 1 of the metal plate is subjected to the liquid phase diffusion joining method. And a portion 5b on the inner surface of the cylinder formed by sub-marque welding to the groove formed in a V shape, for example.

Here, as described above, the depth of the portion 5a formed by the liquid phase diffusion bonding may be about 3 to 15 mm depending on the cutting allowance at the time of manufacturing the roll or at the time of use. When the wall thickness is 30 mm or more, it is better to secure 10 mm or more regardless of the above cutting allowance, from the viewpoint of facilitating welding of the remaining portion. When the wall thickness is as thin as 15 mm or less, the depth of the portion 5a may be set according to the usage conditions of the roll, but the joint portion is in the liquid phase over the entire wall thickness. The manufacturing process can be simplified as a structure formed by the diffusion method.

The overall structure of the hollow roll body member of the present invention is as follows.
It is either the one-piece type shown in FIG. 2 (by the cylindrical molded body 1) or the two-piece type shown in FIG. 3 (by the two semi-cylindrical molded bodies 1 '). The one-piece type has a small number of forming and joining steps, and the end sides to be joined are positioned, while the two-piece type has the advantage that it is easy to adjust the end surface after forming. Each has its own characteristics,
The most convenient one may be selected according to the specifications such as dimensions. Here, the shape such as the cylindrical shape or the semi-cylindrical shape does not necessarily have to be a perfect circle or a semi-circle in cross section, and is disclosed in JP-A-3-16
As disclosed in Japanese Patent No. 9412, the vicinity of the edges to be joined is formed into a flat shape, and the edges are easily contacted with each other for joining, and the deformed cylindrical body after joining is a perfect circular cylinder. A method of correcting the shape of the body may be used. It should be noted that it is possible to adopt a configuration of 3 pieces or more, but it only increases the labor and no merit can be considered.

Although it is generally easy to refine the edges to be welded of the above-mentioned cylindrical shaped body or the like as shown in FIG. 4 for the metal plate Mb before forming, liquid phase diffusion welding is performed. As for the formation of the butt surface for the purpose, there is a step in the refinement after the molding because it is easy to form the surfaces to be joined in parallel. Regarding the portion 5b in FIG. 1 to be joined by a normal welding method, a V-shaped groove or the like is provided according to the welding specifications. This groove processing is also performed at the metal plate stage before forming as shown in FIG. Of 5b
Easy to do like.

Now, the liquid phase diffusion bonding of the portion 5a in FIG.
For example, the following is performed. First, the above 5a part is flattened and cleaned by grinding, polishing, blasting, etc., and a compressive force of about 10 MPa is applied to the part to be joined in which an insert material for liquid phase diffusion bonding is inserted between both sides. Put it in. By the way, as an insert material suitable for steel materials, the melting point of Fe-based, Ni-based, Ni-P-based, etc., which is prescribed for liquid phase diffusion bonding, is 900 to 1
A material of about 100 ° C is suitable, and it can be applied in the form of a foil material, a powder layer, a thermal spray layer, or a plating layer depending on the required specifications of the joint or the joining work conditions. If the thickness of the insert material is too thin, the bonding will be incomplete, and if it is too thick, diffusion will not be easy, so about 20 to 200 μm is preferable.

Next, 90
By heating at about 0 to 1250 ° C and maintaining the temperature for about 3 minutes, the insert material is melted and its active components are diffused and assimilated into the base materials on both sides, and the insert material is isothermally solidified. Joining is completed.

As the heating means, the induction heating method is preferable because it can intensively and rapidly heat the system to be joined. The induction heating may be performed on the entire system to be bonded at once, or partial heating may be sequentially performed by a moving method. Further, it is preferable that the heating is carried out in a non-oxidizing atmosphere or by applying an outside air blocking coating such as clay-like slip coating to the outer periphery of the butted portion in order to avoid oxidation of the joined portion. Since the present invention is intended for large-sized members, the latter method that can simplify the equipment is recommended.

The joining of the portion 5b in FIG. 1 subsequent to the above liquid phase diffusion joining is carried out by a usual welding method, and any means can be used, but it is not necessary to join the portion 5a which is liquid phase diffusion joined. It is better to use a welding method that does not affect the heat. or,
When there is a concern about the above thermal effect, such as when the ratio of the 5a part is smaller than that of the 5b part, welding the 5b part while cooling the 5a part already liquid phase diffusion bonded from the outer surface of the cylinder Good to do.

The outer surface side of the cylindrical body of the joint formed by the above-mentioned joining operation has undergone heating at 900 ° C. or more for liquid phase diffusion joining and is coarsened. Since there is no segregated structure such as ferrite band, the subsequent heat treatment such as quenching and normalization eliminates the characteristic difference from the base metal part, and eliminates the above-mentioned problems such as uneven wear and uneven blasting. .

[0024]

【Example】

Example 1 A hollow roll body member made of a steel plate (S48C) having an outer diameter of 600 mm, a width of 1500 mm, and a wall thickness of 40 mm was manufactured by the configuration of the present invention (1 piece type). The production specifications are as follows. Liquid phase diffusion welded part (outer surface side) ・ Depth 15mm ・ 50μm thick Fe-based insert material (melting point 1100 ° C) ・ Outer periphery of the welded part with the insert material interposed between the base metal end faces Is a commercially available antioxidant coating agent (Tokyo Thermal Chemical Industry Co., Ltd.)
Made by "Thermojin Black"), and a 1-turn electromagnetic coil is arranged so as to surround the joined part along the joining line across the front and back, and a compressive force of 10 MPa is applied to the joined part. The coil is energized at 2 kHz and 400 kW (max) to inductively heat the system to be bonded, to reach 1250 ° C in 180 seconds, maintain the temperature for 120 seconds, and allow it to cool to perform the bonding operation. finished. Welded joint (inner surface side) ・ Depth 25 + αmm ・ V-shaped groove is formed and welded by sub-marque welding. Heat treatment ・ Normalizing (850 ℃) ・ Surface induction hardening (900 ℃) ・ Tempering (200 ℃)

Next, the surface hardness distribution across the joining line on the outer surface side of the joining portion of the hollow roll body member of the present invention was measured, and the results shown in FIG. 5 were obtained. That is, the distribution of the surface hardness, which is a parameter of the uneven wear, is flat without being disturbed even at the joining line, and the effect of the present invention was confirmed.

Example 2 A portion to be joined in which the insert material of Example 1 was changed to a thermal sprayed layer of Ni-based insert material (thickness: 150 μm, melting point: 1050 ° C.) was induction-heated by a moving method to form a liquid phase. A hollow roll body member was manufactured under the same conditions as in Example 1 except for the diffusion bonding. The specifications of induction heating for liquid phase diffusion bonding are as follows. -Coil: A 1-turn coil having a straight part having a length of 180 mm is arranged on the outer surface of the cylinder so that the straight part runs along the joining line.・ Operation: While energizing the above coil at 2kHz, 100 to 150kW, move the coil from one end of the joining line to the other end at 1mm / s.
Move at the speed of. Also in the hollow roll body member manufactured as described above, the hardness distribution across the joining line was as good as in Example 1.

[0027]

As described above, according to the present invention, the conventional welding joining method is constituted by forming at least the cylindrical outer surface side of the joining portion of the plate-rolled type hollow roll body member by the liquid phase diffusion joining method. Then, the problems such as unevenness of the surface hardness related to the joint, which could not be eliminated, could be eliminated. The liquid phase diffusion bonding method has hitherto been regarded as a bonding method in which the above-mentioned hardness unevenness is less likely to occur, but it is not considered that it can be applied to bonding a large area such as a plate-wound hollow roll. It was The inventors of the present application have come to think that the quality requirement of the hollow roll is particularly on the outer surface side, and have conceived to apply liquid phase diffusion bonding to the outer surface side portion of the roll body. -It was possible to realize the application to the fuselage member.

Compared with other hollow roll body manufacturing methods such as the centrifugal casting method and the casting method, the plate winding method has a degree of freedom in design, quality, or cost except for the problems such as hardness unevenness of the joint. In this case, it is possible to secure a superiority on the whole by solving the joint problem according to the present invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a joint portion mode of a hollow roll body member of the present invention.

FIG. 2 is a sectional view of a cylindrical molded body of a metal plate.

FIG. 3 is a cross-sectional view of two semi-cylindrical shaped bodies in a butted state.

FIG. 4 is a cross-sectional view showing the adjustment of the edges to be joined with respect to the metal plate before forming.

FIG. 5 is a chart showing the surface hardness distribution in the direction crossing the joining line on the outer surface side of the joining portion of the hollow roll body member of the present invention.

[Explanation of symbols]

 1 Cylindrical molded body 2,3 Straight end 4 Cylindrical body 5 Joint 5a Cylinder outer surface side 5b Cylinder inner surface side

Claims (4)

[Claims] 1. A member for a hollow roll body having a joining portion, which is formed by closing the straight end sides of two cylindrical semi-cylindrical formed bodies of a metal plate by joining to form a cylindrical body. A hollow roll body member, characterized in that at least a portion of the joint portion on the outer surface side of the cylinder is formed by a liquid phase diffusion joining method. 2. The hollow roll body member according to claim 1, wherein a depth of a portion of the joined portion formed on the outer surface side of the cylinder by the liquid phase diffusion joining method is 3 to 15 mm. 3. A metal plate is formed into a cylindrical shape or a semi-cylindrical shape, and the shape of a straight edge is formed so that predetermined portions of the end face on the outer surface of the cylinder can abut against each other. The end surfaces of the parts are butted against each other via an insert material, and the insert material is melted by heating to perform liquid phase diffusion bonding, and then the parts of the end surfaces which are not liquid phase diffusion bonded are joined by a conventional method. A method for manufacturing a hollow roll body member, which comprises forming the cylindrical body by welding. 4. The method for manufacturing a hollow roll body member according to claim 3, wherein the heating is performed by applying an outside air blocking coating to the outer periphery of the portion abutted with each other through the insert material.