JP3283695B2 - Large area metal sheet manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a large-area metal plate in a small amount which is difficult to produce with a large-scale rolling mill.

[0002]

2. Description of the Related Art Some applications of thin metal plates require a seamless large area. For example, there is a steel plate for an automobile body, which is manufactured by being rolled by a wide rolling mill. In this manufacturing method, a material having a predetermined width is used from the stage of a slab of continuous casting or a steel slab after slab rolling, and rolling is repeated to a predetermined thickness. Rolling mills include, for example, a tandem mill that continuously rolls five or six rolling mills and a reverse mill that reciprocally rolls one or two rolling mills. Becomes

[0003] However, such a production method is possible only for mass-produced products such as steel plates for automobiles, and is not suitable for use where, for example, several metal plates each having a side of a few meters are required. It is virtually impossible to roll such plates in the aforementioned mass production rolling mills designed to handle coiled material. On the other hand, since a rolling mill capable of rolling a wide material such as a sheet having a width of 2 m or more is huge in itself, there is no such thing that a cutting plate is fed one by one and rolled.

[0004] When a special metal material which is not used in a large amount and has a large area is required due to the above-mentioned circumstances, it is general to use the material from the economic point of view. There are cases, however, where the desired performance cannot be achieved. Japanese Patent Application Laid-Open No. 3-273 is an example of such an example.
No. 700 discloses a Nb-T as a superconducting magnetic shield.
A multilayer cylinder in which an i-based alloy layer and a high-conductivity metal layer are alternately laminated is described. Similarly, Japanese Patent Application Laid-Open No. 4-43207 describes a multilayer cylinder of Nb ₃ Sn. These are superconducting magnetic shield cylinders characterized by having no cuts or joints in both the circumferential direction and the axial direction of the cylinder. Since cuts and joints cut off or significantly weaken the superconducting shielding current, a method of preventing them is to produce a multilayer composite plate processed by clad rolling into a cylindrical body by pressing such as deep drawing. ing. To manufacture such a magnetic shield, it is necessary to draw a large-area metal plate into a cylinder or the like by drawing. These shield cylinders are currently expected to be applied to the magnetic shield of large superconducting magnets such as MRI, but have a diameter of 1 m.
It needs to be longer, preferably about 1.5 m. The diameter of a blank disk for deep drawing a cylinder having such a large diameter needs to be 2 m or more.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a large-area metal plate at a low cost even in the case of small-volume production.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a rectangular metal plate of a raw material is rolled into a cylinder, and the ends are butt-welded to make the welding surface smooth, and then the cylindrical shape is formed. One end of the cylinder was fixed to a mold, and while rotating the mold, a tool was sequentially pressed from the fixed side of the cylinder to reduce the thickness of the cylinder, extend the cylinder in the axial direction, and then welded. This is a method for manufacturing a large-area metal plate, in which a portion is cut and removed and the plate is returned to a flat plate. Here, a disk or a cup-shaped bottomed cylinder having the same diameter as the cylinder is welded to one end of a cylinder obtained by rolling a square metal plate of the raw material, and the cylinder of the raw material is molded into a mold at the disc or the cup-shaped bottomed cylinder. Alternatively, one end of a cylinder obtained by rounding a square metal plate of a raw material is bent inward, and the raw material cylinder is fixed to a mold at the bent portion.

As another method, a square metal plate of a raw material is rolled into a cylinder and the ends thereof are butt-welded, and a disk or a cup-shaped bottom cylinder having the same diameter as the cylinder is welded to one end of the cylinder to form a welding surface. After smoothing, the gap between the punch and the die is ironed with a punch and dice smaller than the thickness of the metal plate of the raw material to reduce the thickness of the cylinder and extend the cylinder in the axial direction. This is a method for manufacturing a large-area metal plate, characterized in that the part which has been cut off is returned to a flat plate again. In each of the above methods, a square metal plate as a raw material is manufactured by rolling, and the axial direction of a cylinder obtained by rolling the rectangular metal plate is perpendicular to the rolling direction.

[0008]

According to the present invention, the metal plate of the material is rolled into a cylinder, the seam is integrated by welding, one end of the joint is attached to a cylindrical mold, and the tool is pressed while rotating to reduce the thickness. By processing, the cylinder is extended in the axial direction to increase the area of the metal plate. The metal plate used as a raw material is generally manufactured by a normal rolling process. The width of the rolled material is determined by the specifications of the rolling mill and the width cannot be increased in small-scale production of special materials because a small rolling mill must be used. However, there is virtually no limit on the length that can be rolled. Therefore, a metal plate having a large area can be obtained by extending the material only in one direction in the width direction at the time of rolling. Therefore, the rolling direction 3 should be perpendicular to the axial direction of the cylinder 1 as shown in the perspective view of the cylinder in FIG. In the figure, reference numeral 2 denotes a weld.

As described above, the metal plate of the material is welded after being rounded into a cylindrical shape, but this is performed by butt welding. Here, the butt welding means not the lap welding but the joining in which the end faces of the plates are joined together. Therefore, the welding method itself does not matter. Generally, electron beam welding, TIG welding, and plasma welding are preferred, but other welding methods such as MIG welding and laser welding can also be used. If the bead is protruding from the welded portion, it will be an obstacle to subsequent processing.

Further, as shown in FIG. 3, a cup-shaped bottomed cylinder having a diameter matching that of the cylinder 1, that is, a cup material 4, is welded to the above-mentioned cylinder as means for attaching to a mold. Although there is no limitation on the method of making the cup material, the cup material can also be obtained by pressing a jig such as a spatula along a die along with a mounting die and drawing the disk-shaped blank. Of course, drawing by a punch and a die may be used. The material may be any material as long as it can be welded to a cylindrical material and has sufficient strength, and may be the same as the material. In addition, although welding becomes slightly difficult at the corners, it may be welded to the cylinder using a disk having the same diameter as the cylinder 1 instead of the cup material 4 shown in FIG.

As another means for attaching the cylinder to the mold, one end of the cylinder may be bent inward as shown in the sectional view of FIG. 4, and the bent portion 11 may be fixed by sandwiching it with a jig. In this case, the bending can be performed by an apparatus for carrying out the present invention in the same manner as in the case of forming the cup material. In this method, the method of fixing the cylinder to the mold for bending processing becomes a problem, but there is no need to fix firmly because a large force is not applied in the axial direction of the cylinder during processing, and it is necessary to tighten and fix with a band Good in the way. As a further simple method, the anvil can be inserted into the inside of the cylinder, hit with a hammer, and bend while rotating little by little.

The bottomed or edged cylinder fabricated as described above is mounted on a rotating cylindrical mold. FIG. 1 is a sectional view showing this state. In this figure, a holding jig 5 holds a bottom portion of a cylinder 10 having a cup-shaped bottom.
And is fixed to the mold 6. Then, while rotating the mold, the tool 7 is sequentially moved from one end on the fixed side of the cylinder to the other end while pressing the tool 7 to reduce the thickness of the cylinder. The tool can be either a simple bar or a spatula or a rotating roller. As a result, the cylinder extends in the axial direction. If the processing is not performed once for a predetermined thickness or length of the cylinder, the same processing may be repeated a plurality of times.

[0013] The cylindrical member whose dimension has been increased in the axial direction in this way is removed from the metal fittings, and the bottom portion is cut off. Cutting at the welded portion is advantageous because portions different from the raw material, such as the structure, are removed. The large-area flat plate manufactured as described above may be flattened by a roller leveler or a stretch leveler or may be subjected to recrystallization annealing as needed. When the cylinder with the cup-shaped bottom is used, it can be naturally reused for the next processing.

As another method of the present invention, a disk or a cup-shaped bottomed cylinder is welded to a cylinder whose side is welded in the same manner as in the above-mentioned method, and the welded surface is smoothed.
As shown in (1), the thickness of the cylinder 10 can be reduced by punching with a punch and die in which the gap between the punch 8 and the die 9 is smaller than the thickness of the metal plate of the raw material, and the cylinder can be extended in the axial direction. A general hydraulic press or the like can be used as an apparatus for processing. The method of extending the cylinder to a predetermined length, cutting the cylinder at the welded portion, and forming the plate again is the same as the above-described method.

Although this method is more efficient than the method of processing between the rotating die and the tool, it is suitable when the material is relatively workable and the reduction rate of the sheet thickness is not so large. . In addition, since a force is applied to the entire circumference of the cylinder with the cup-shaped bottom at the same time at the time of processing, the cylinder has sufficient strength itself and also needs sufficient strength for welding to the cylinder of the raw material. Further, in this method, since the welded portion is also processed, it is necessary to sufficiently smooth the weld bead before the processing.

[0016]

EXAMPLE A Nb-Ti alloy plate having a thickness of 4 mm, a width of 50 cm and a length in the rolling direction of 200 cm was bent into a cylinder by roller bending so that the width direction became the axis of the cylinder. The side surface of this cylinder is T
They were joined by IG welding and smoothed with a grinder so that the surface became the same as the thickness of the material. Further, a cup of the same material was welded to the cylinder. The welding method is the same as that for welding the side surface of the cylinder.

This was fixed to a mold having a diameter of 61 cm by screwing with a cup portion interposed therebetween, and a roller was pressed from one end of the fixed side while rotating to reduce the thickness of the cylinder. The process was repeated until the thickness became 1 mm, and then removed from the mold. Thereafter, the cup portion and the welded portion on the side of the cylinder were cut off and annealed in an argon atmosphere. Furthermore, it was flattened by a stretch leveler. As a result, a flat plate having a width of about 200 cm and a length of about 200 cm was obtained.

A Nb-Ti alloy plate having a thickness of 3.5 mm, a width of 50 cm and a length of 100 cm in the rolling direction was bent into a cylinder by roller bending so that the width direction became the axis of the cylinder. The side surface of the cylinder was joined by TIG welding using a filler wire made of a common metal, and a cup having the same material and thickness was welded to the cylinder by the same welding method. The surface of the weld was smoothed with a grinder so that the surface of the weld was the same as the pressure of the material.

The cylinder with the bottom manufactured as described above was ironed with a punch and a die having a gap between the punch and the die of 1.5 mm using a hydraulic press. Thereafter, the welded part was cut off, and the ear part where the elongation in the axial direction became uneven was cut off. This was annealed in an argon atmosphere, and flattened by a stretch leveler. As a result, a flat plate having a width of about 100 cm and a length of about 100 cm was obtained.

[0020]

According to the present invention, it has conventionally been difficult to produce a large-area plate in small quantities due to the limitation of the width in the rolling mill, but it can be manufactured with extremely inexpensive equipment.
In particular, in the method by rolling, the production of a plate having a width of more than 2 m is extremely expensive.
The manufacture of plates such as m is also possible.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a manufacturing method of the present invention.

FIG. 2 is a diagram showing a state in which a metal plate made of a material is formed into a cylinder;

FIG. 3 is a sectional view showing a state in which a cup-shaped bottomed cylinder is attached to the cylinder.

FIG. 4 is a sectional view showing a state where one end of a cylinder is bent inward.

FIG. 5 is a diagram illustrating another manufacturing method of the present invention.

[Explanation of symbols]

 1, 10 Cylinder 2 Welded part 3 Rolling direction 4 Cup material 5 Holding jig 6 Die 7 Tool 8 Punch 9 Die 11 Bent part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-217084 (JP, A) JP-A-57-94429 (JP, A) JP-A-4-55016 (JP, A) 273700 (JP, A) JP-A-5-243778 (JP, A) JP-A-58-38324 (JP, U) Patent 115251 (JP, C2) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) B21C 37/00-43/04 B21D 22/14 H05K 9/00 ZAA

Claims (5)

(57) [Claims] 1. A square metal plate of a raw material is rounded into a cylinder, and the ends are butt-welded to flatten a welding surface. Then, one end of the cylinder is fixed to a cylindrical mold, and the mold is rotated. While sequentially pressing the tool from the fixed side of the cylinder to reduce the thickness of the cylinder and extend the cylinder in the axial direction, the welded portion is cut and removed and returned to a flat plate again. Metal plate manufacturing method. 2. A disk or cup-shaped bottomed cylinder having the same diameter as the cylinder is welded to one end of a cylinder obtained by rolling a square metal plate of a raw material, and the raw material is put into a mold at a portion of the disk or the cup-shaped bottomed cylinder. The cylinder is fixed.
3. The method for producing a large-area metal plate according to item 1. 3. The large-area metal plate according to claim 1, wherein one end of a cylinder formed by rolling a square metal plate of a raw material is bent inward, and the cylinder of the raw material is fixed to a mold at the bent portion. Production method. 4. A square metal plate of a raw material is rounded into a cylinder, the ends are butt-welded, and a disk or a cup-shaped bottom cylinder having the same diameter as the cylinder is welded to one end of the cylinder to make the welding surface smooth. After that, the gap between the punch and the die is ironed with a punch and dice smaller than the thickness of the metal plate of the raw material to reduce the thickness of the cylinder, extend the cylinder in the axial direction, and then cut the welded part A method for producing a large-area metal plate, comprising removing the plate and returning it to a flat plate. 5. The method according to claim 1, wherein a square metal plate as a raw material is manufactured by rolling, and an axial direction of a cylinder obtained by rolling the rectangular metal plate is perpendicular to a rolling direction.
The method for producing a large-area metal plate according to any one of the above.