JPH10137801A - Method and apparatus for improving surface quality of rough drawn wire - Google Patents

Abstract

(57) [Summary] Even if blowholes are generated in an ingot, the surface quality of the rough drawn wire can be reduced and the surface quality of the rough drawn wire manufactured from the ingot can be improved. An improvement method and apparatus are provided. The surface of the ingot near the upper layer where many blow holes are present is cut at the stage before rolling of the ingot, thereby reducing the surface damage of the rough drawn wire obtained by hot rolling the surface. By doing so, defects in the ingot can be significantly reduced, and the surface quality of the rough drawn wire obtained by hot rolling the ingot can be improved. A milling machine was installed above the exit of the horizontal continuous casting machine in order to remove the blowhole existing portion in the ingot, which causes the deterioration of the surface quality of the rough drawn wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the technical field of horizontal continuous casting and rolling, and more specifically, to the production of rough drawn wires by a horizontal continuous casting and rolling facility, particularly a conch rod type continuous casting and rolling facility. An object of the present invention is to provide a method and an apparatus for improving the surface quality of a rough drawn wire.
“Horizontal” is used in a sense that can include “horizontal”.

[0002]

2. Description of the Related Art As a method for producing a rough wire through a melting, casting and rolling process for a metal used as a conductive material such as copper or aluminum, a continuous casting and rolling method is used in view of productivity, yield and product quality. Production is being actively carried out. In recent years, most of the materials for processing copper and copper alloys in particular have been manufactured by a continuous casting and rolling method.

FIG. 2 is a schematic view showing a conti-rod type horizontal (horizontal) continuous casting and rolling facility as an example of a continuous casting and rolling facility for producing a rough drawn wire. For example, in the case of copper, in the present equipment, the electrolytic copper plate 8 is melted in the shaft furnace 1, and the resulting molten copper 9 passes through the holding furnace 2 and is sent from the nozzle 4 to the tundish 5 via the casting gutter 3. The molten copper 9 thus fed is continuously poured into a horizontal twin-belt type casting machine 6, and the copper ingot 10 sent out from the casting machine 6 is hot-worked by rolling rolls 7. Thus, a rough copper wire 12 having a predetermined diameter is obtained.

[0004] When attempting to obtain various wires (products) by cold drawing the rough drawn wire 12 obtained as described above, surface defects of the rough drawn wire 12 become a serious problem. For example, in the case of a rough drawn wire having many scratches on the surface, the defect causes breakage during cold drawing, and it is difficult to obtain a desired product, or a unit weight during drawing process. There is a concern that the number of disconnections per contact will increase. As a result, production efficiency will decrease and product costs will increase.

Therefore, in order to deal with the above problem,
It is necessary to reduce defects such as surface scratches of the rough drawn wire 12 and to improve the surface quality. Although there are many factors that affect the surface quality of the rough drawn wire 12, the blowhole in the ingot 10 closes a large weight. This blow hole is a horizontal (horizontal) type of conch rod type
In the ingot 10 manufactured by the casting machine 6, as shown in FIG. 3, the ingot mainly exists in the vicinity of the upper layer, and this extends in the longitudinal direction in the rolling step by the rolling roll 6,
This causes a surface defect of the rough drawn line 12. Therefore, investigation of the cause of the generation of the blowhole 13 and investigation of a method for preventing the blowhole 13 have been actively conducted.

[0006]

FIG. 1 and FIG. 2 described above.
As described above, in order to improve the surface quality of the rough drawn wire 12 manufactured by the conti-rod type continuous continuous casting and rolling equipment,
Although it is desired to prevent the blowholes 13 in the ingot 10, it is extremely difficult to completely prevent the blowholes 13 according to the related art, and a method for improving the surface quality which has been established yet. The fact is that it has not been proposed.

Therefore, the problems to be solved by the present invention (objects)
In view of the problems of the prior art described above, even if blowholes occur in the ingot, it is possible to reduce the surface defects of the rough drawn wire manufactured from the ingot and improve the surface quality of the rough drawn wire. It is an object of the present invention to provide a surface quality improving method and apparatus.

[0008]

According to the present invention, there is provided a method for improving the surface quality of a rough drawn wire, which comprises performing surface cutting near the upper layer of an ingot where many blow holes exist at a stage before rolling of the ingot. To reduce the surface scratches of the rough drawn wire obtained by hot-rolling. By doing so, defects in the ingot can be significantly reduced, and the surface quality of the rough drawn wire obtained by hot rolling the ingot can be improved.

Further, the apparatus for improving the surface quality of a rough drawn wire provided by the present invention is intended to remove a blowhole existing portion in an ingot, which causes a reduction in the surface quality of the rough drawn wire, so as to remove the portion above the outlet of the horizontal continuous casting machine. Is equipped with a milling machine.

[0010]

FIG. 1 shows an embodiment of a method and an apparatus for improving the surface quality of a rough drawn wire according to the present invention. In this embodiment, in view of the fact that the blowhole 13 in the ingot 10 mainly exists near the upper layer of the ingot 10, a milling machine 14 is installed above the outlet of the casting machine, and the blowhole 1
(3) A method of surface cutting the existing portion. At this time, if the generated swarf-like copper powder 15 adheres to the ingot 10 and enters the next step of the hot rolling line, it causes the surface quality of the rough drawn wire to deteriorate. Was sprayed to remove it completely.

The following Table 1 shows the conventional continuous casting and rolling equipment;
The surface quality of the rough drawn wire manufactured according to FIG. 2 is compared with the surface cutting means of the ingot 10 of this embodiment; the surface quality of the rough drawn wire manufactured by the continuous casting and rolling equipment into which FIG. .

[0012]

[Table 1]

As is clear from Table 1, the surface quality of the rough drawn wire manufactured by the continuous casting and rolling equipment having the above-mentioned embodiment is as follows.
Compared to the surface quality of rough drawn wire manufactured with the conventional equipment,
Turned out to be very good.

As described above, according to the method and apparatus for improving the surface quality of a rough drawn wire according to the present embodiment, the rough drawn wire 12 is formed by a continuous (horizontal) continuous casting and rolling equipment of a conch rod type.
In the production of the steel sheet, the portion where the main blowhole 13 in the ingot 10 is present, which causes the surface defect of the rough drawn wire 12, is cut and removed by the milling machine 14, so that the surface quality is reduced. Excellent manufacturing of the rough drawn wire 12 can be realized. As a result, in the cold drawing process of the rough drawn wire 12 manufactured by the present continuous casting and rolling equipment, troubles such as disconnection due to surface scratches can be significantly reduced, thereby improving product production efficiency and reducing costs. It becomes possible to plan.

The above embodiment is a preferred embodiment to the extent that it is not tired, and various modifications may be made according to the present invention. For example, at the time of hot rolling of the ingot 10, rough lines 12 mainly due to cracks (hot rolling cracks) generated on the side surfaces thereof
In order to prevent the surface scratches, it is effective to install the milling machine 14 on both sides of the rolled material 11.

[0016]

According to the present invention as described above, even if blowholes are generated in an ingot, surface defects of rough drawn wires produced from the ingot are reduced, and the surface quality is improved. The intended problem (object) of providing a method and an apparatus for improving the surface quality of a rough drawn wire can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a conti-rod type horizontal (horizontal) continuous casting and rolling facility according to an embodiment of a method and an apparatus for improving surface quality of a rough drawn wire according to the present invention.

FIG. 2 is a schematic view of a conventional conti-rod type horizontal (horizontal) continuous casting and rolling facility.

FIG. 3 is an explanatory perspective view schematically showing the positions of main blowholes in the ingot in FIG. 2;

[Explanation of symbols]

 Reference Signs List 10 Copper ingot 13 Blow hole 14 Milling machine 15 Copper powder;

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hiroaki Tsunoda 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Pref.

Claims (2)

[Claims] 1. A method for producing a rough drawn wire having a predetermined diameter by continuously hot rolling an ingot by a horizontal continuous casting and rolling facility, wherein an upper layer of the ingot having many blowholes before the ingot is rolled. A method for improving the surface quality of a rough drawn wire by reducing the surface scratches of the rough drawn wire obtained by hot-rolling the surface by cutting the vicinity of the portion. 2. In a horizontal continuous casting and rolling equipment for continuously producing a rough wire having a predetermined diameter by hot rolling an ingot, a blow hole existing portion in the ingot which causes a deterioration in surface quality of the rough wire is removed. Milling machine installed above the exit of the horizontal continuous casting machine to remove the surface quality of rough drawn wire.