JP2000190020A - Manufacture of plate and bar and manufacture of welded groove tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide methods suitable for small production, and reduce the manufacturing costs. SOLUTION: An electrolytic copper is melted in a melting furnace and is continuously cast to produce a billet 1. Then, the billet 1 is heated in a heating furnace, and then hot-rolled, cold-rolled, and cold-reduced to form a reduced pipe 4. Then, after the reduced pipe 4 is cut in the direction parallel to the axial direction of the pipe, the cut portion is opened and sizing is done. Then the plate 5 obtained is rolled and cut to prescribed dimensions to obtain a copper plate 6. Also, the copper plate 6 is grooved and sized like a pipe and the butt end faces are welded, thus manufacturing the welded grooved pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plate or a strip which is suitable for small-quantity production and can reduce the manufacturing cost, and a method for manufacturing a welded grooved pipe using the plate or the strip.

[0002]

2. Description of the Related Art Metal or alloy plates or strips are generally produced by subjecting a slab to one or both of hot rolling and cold rolling.

[0003] A conventional rolling plate manufacturing process will be described below. As a raw material, for example, electrolytic copper is used, melted in a melting furnace, and then continuously or semi-continuously cast to produce a slab made of electrolytic copper. Next, after heating the obtained slab with a soaking furnace, the slab heated by hot rolling is rolled to form a hot-rolled plate having a width of 450 mm and a plate thickness of 10 mm, which is temporarily Wind around the coil. Next, the hot-rolled plate is cold-rolled to form a cold-rolled plate having a width of 500 mm and a thickness of 0.4 mm, which is wound around a coil again. Thereafter, a cold-rolled plate is slit at a predetermined position to obtain a copper plate having a width of 30 mm and a plate thickness of 0.4 mm, which is wound around a coil.

[0004] The hot-rolled sheet obtained in the hot-rolling step may be continuously cold-rolled without being wound around a coil.

In the case of manufacturing a welded grooved tube from the obtained copper plate, the copper plate is rolled with a groove forming roll to transfer the groove shape of the groove forming roll to the surface of the copper plate. The grooved plate is sized to form a tube, and the butted end faces are welded to obtain a grooved tube. Thereafter, the obtained grooved tube is wound around a coil and annealed to obtain a welded grooved tube.

[0006]

However, when a plate or a strip is manufactured by the conventional manufacturing method, the hot rolling mill and the cold rolling mill generally used for manufacturing a plate are large-scale. The cost is significantly higher. In addition, at both ends in the rolling width direction and both ends in the rolling longitudinal direction of the rolled material, since the rolling load and the rolling speed become non-uniform, the product dimensions are not stable, and this part is usually omitted. . For this reason,
Yield decreases and total cost increases.

[0007] The present invention has been made in view of such problems, and is intended to provide a method of manufacturing a plate or a strip and a method of manufacturing a welded grooved pipe suitable for small-quantity production and capable of reducing the manufacturing cost. The purpose is to provide.

[0008]

According to the present invention, there is provided a method for manufacturing a plate or a strip, comprising the steps of forming a metal or alloy tubular body, and cutting the tubular body in a direction parallel to the tube axis direction. Opening the cut portion and sizing it into a plate shape.

The method of manufacturing a pipe with a weld groove according to the present invention includes a step of forming a tubular body made of metal or alloy, a step of cutting the tubular body in a direction parallel to the pipe axis direction, and the cut portion. Opening and sizing into a plate to obtain a plate,
A step of providing a groove on one or both sides of the plate material to obtain a grooved plate, a step of sizing the grooved plate into a tube, and a step of welding and joining the butted end surfaces of the tube-sized grooved plate. It is characterized by having.

Preferably, the tubular body is made of copper or a copper alloy.

In the present invention, a plate or a strip is manufactured by cutting and sizing the tubular member, so that a conventional small-scale pipe manufacturing apparatus can be used. Then, a groove is provided in this plate or strip, and a tube with a welding groove is manufactured by processing it into a tubular shape. Therefore,
The method for producing a plate or a strip and the method for producing a welded grooved tube according to the present invention are suitable for small-quantity production and use a conventional hot rolling mill and cold rolling mill for large-scale plate production. As compared with, the manufacturing cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a plate or a strip according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings. FIGS. 1A to 1F are perspective views showing a method of manufacturing a plate or a strip according to a first embodiment of the present invention in the order of steps. As shown in FIG. 1A, for example, JIS21
A billet 1 made of electrolytic copper is produced by melting a raw material made of electrolytic copper of 21 H3300 in a melting furnace and continuously or semi-continuously casting this. Next, as shown in FIG. 1 (b), after the obtained billet 1 is heated by a heating furnace, it is formed by hot extrusion, for example, an extruded tube having a diameter of 120 mm and a wall thickness of 10 mm. 2
To form

Next, as shown in FIG. 1 (c), the extruded tube 2 is cold-rolled, for example, to a diameter of 50 m.
m, to form a rolled tube 3 having a thickness of 3 mm. afterwards,
As shown in FIG. 1D, the rolled tube 3 is further cold drawn to form a drawn tube 4 having a diameter of 9 mm and a wall thickness of 0.4 mm, for example. Thereafter, as shown in FIG. 1 (e), the drawn tube 4 is cut in a direction parallel to the tube axis direction using a rolling cutter (not shown), and then the cut portion is opened. The base plate 5 is obtained by sizing.

Thereafter, as shown in FIG.
After rolling, the copper plate 6 is obtained by cutting to a predetermined size. Thereafter, if necessary, the obtained copper plate is continuously annealed and then wound around a coil.

According to the above-described method, the copper plate 6 can be manufactured by using a conventional small-scale tube manufacturing apparatus. The manufacturing cost can be reduced as compared with the case where a cold rolling mill and a cold rolling mill are used.

Next, a method for manufacturing a grooved pipe according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In this embodiment, the steps up to the step of forming the copper plate 6 are the same as the steps shown in FIGS. 1A to 1F, and only the steps after the formation of the copper plate 6 will be described below. FIG.
(A) thru | or (d) are figures which show the manufacturing method of the welding grooved pipe which concerns on the 2nd Example of this invention in process order, and are perspective views which show the next process of FIG.1 (f).

As shown in FIG. 2A, the obtained copper plate 6
Is rolled by the groove processing roll 7 to transfer the groove shape of the groove processing roll 7 to the surface of the copper plate 6. Then, FIG.
As shown in FIG. 2B, the obtained grooved plate 8 is sized to form a tube, and the butt end face 8a is resistance-welded to obtain a grooved tube 9 shown in FIG. 2C. afterwards,
As shown in FIG. 2D, the grooved tube 9 is wound around a coil 10 and annealed to obtain a welded grooved tube 11.

According to the above-described method, the copper plate 6 before being processed into a tubular shape can be manufactured by using a conventional small-scale tube manufacturing apparatus, and thus is suitable for small-scale production of welded grooved tubes. In addition, the production cost can be reduced as compared with the case where a conventional hot rolling mill and cold rolling mill for large-scale plate production are used.

In the first and second embodiments shown in FIGS. 1 and 2, the drawn tube 4 was cut, sizing it to obtain a raw plate, and then rolling and cutting to produce a copper plate. These rolling and cutting steps and subsequent annealing can be omitted, and may be performed as needed. In the step of annealing the obtained copper plate 6,
The copper plate 6 may be annealed after being wound around a coil. Furthermore,
In producing a copper plate, electrolytic copper was used as a raw material. However, in the present invention, the raw material of the plate or strip to be produced is not limited to copper, and can be selected as necessary. For example, various copper alloys, aluminum or aluminum alloys, titanium or titanium alloys, or stainless steel may be used.

Furthermore, in the second embodiment for manufacturing a welded grooved tube, after sizing the grooved plate 8, the butt end face 8a is resistance-welded to obtain the grooved raw tube 9. The welding method is not particularly limited, and welding by TIG welding or the like can be used. Furthermore, in the step of annealing the grooved tube 9, the coil 10
The coil may be annealed after being wound, or may be annealed while being wound around the coil 10.

[0021]

As described in detail above, according to the present invention,
Since the plate or strip is manufactured by cutting and sizing the tubular member, it is possible to use a small-scale pipe manufacturing apparatus which has been conventionally used, which is suitable for small-quantity production and a conventional large-scale pipe. The manufacturing cost can be reduced as compared with a case where a hot rolling mill and a cold rolling mill for manufacturing a flat plate are used. Further, according to the present invention, since the welded grooved pipe is manufactured using this plate or strip, it is suitable for small-quantity production as in the case of manufacturing the plate or strip, and the manufacturing cost is lower than the conventional manufacturing method. Can be reduced. Further, by appropriately selecting the cutting position of the tubular member, a high-quality plate, strip or welded grooved pipe with less uneven thickness can be obtained.

[Brief description of the drawings]

FIGS. 1A to 1F are perspective views showing a method for manufacturing a plate or a strip according to an embodiment of the present invention in the order of steps.

FIGS. 2A to 2D are perspective views showing a method for manufacturing a welded grooved pipe according to an embodiment of the present invention in the order of steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Billet 2; Extruded tube 3; Rolled tube 4; Drawing tube 5; Raw plate 6; Copper plate 7; Grooved roll 8;

Claims (5)

[Claims] 1. A step of forming a metal or alloy tubular body, a step of cutting the tubular body in a direction parallel to a tube axis direction, and a step of opening the cut portion to size it into a plate shape. And a method for producing a plate or a strip. 2. The method according to claim 1, wherein the tubular body is made of copper or a copper alloy. 3. The method for manufacturing a plate or a strip according to claim 1, wherein the tubular body is cut at a position where the tubular body has a minimum thickness. 4. A step of forming a metal or alloy tubular body, a step of cutting the tubular body in a direction parallel to the tube axis direction, and opening the cut portion to size the plate to form a plate material. Obtaining a groove, providing a groove on one or both sides of the plate material to obtain a grooved plate, sizing the grooved plate in a tubular shape, and welding and joining abutting end faces of the tubular sized grooved plate. And a process for producing a welded grooved pipe. 5. The method according to claim 4, wherein the tubular body is made of copper or a copper alloy.