JP2000079402A - Rolling device for metal base stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device for metal base stocks with which the thickness and width of a metallic base stock such as a metal slab and steel ingot are efficiently reduced to a prescribed value without crop loss and which is continuously operable for many hours. SOLUTION: In the rolling device for metal base stocks with which the metal base stock for rolling such as the metal slab and steel ingot which are sent to a hot rolling process is worked so that its thickness and width are reduced to the prescribed width over the entire length, a pair of press tools 2 which are placed opposite to each other on both sides of the conveying pass-line of the metal base stock for rolling are provided on either or both of the inlet side and outlet side of a rolling mill 1. These press tools 2 consist of 1st processing dies 2a, 2a which are placed opposite to each other and 2nd processing dies 2b, 2b which are placed opposite to each other, and are conventionally provided on the inlet side of the rolling mill 1 and attached to side guides 4 for executing alignment in the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus for reducing the thickness and width of a metal material such as a metal slab or a steel ingot as a material to be rolled. The present invention relates to a metal material rolling apparatus capable of efficiently operating continuously for a long period of time without increasing crop loss by reducing the number of crops.

[0002]

2. Description of the Related Art Generally, continuously cast metal slabs and ingots cast in various shapes need to be adjusted to a required thickness and width in accordance with a subsequent rolling process in order to increase productivity. Heretofore, a so-called bulk rolling mill using a rolling mill having a vertical roll and a rolling mill having a horizontal roll has been used for this adjustment. Recently, expensive high-grade metals such as titanium metal having excellent heat resistance and weather resistance have also been widely used.However, these slabs and steel ingots are cylindrical or other ingots due to their refining properties. Such as the unique shape of the metal slab for conventional hot rolling is significantly different, as a result,
In addition to requiring large processing, there is a problem that crop loss is likely to occur in a large amount.

[0003] Therefore, in order to roll a metal material with a slab rolling mill, re-meshing rolling and double top rolling have been conventionally used (theory and practice of sheet rolling: edited by The Iron and Steel Institute of Japan, Showa 59). September, pp. 78-79). What is bite-back rolling?
Using the fact that the crop on the rolling bite side is smaller than the crop on the roll bottom side, the both ends of the steel ingot or metal slab are rolled back several times in advance using a rolling mill so that a crop is generated at the biting end. After the rolling, the unrolled portion is rolled to reduce the occurrence of a large crop on the trailing edge side (rewinding rolling). In addition, both top rolling is performed after rolling from the biting end. This is a rolling method in which a predetermined rolling size is obtained by repeating the same rolling mill in which the rolling is interrupted halfway and subsequently the same rolling is performed from the opposite side.

However, in either method, the number of rolling passes is greatly increased in order to obtain the same total rolling reduction.
There are problems such as a decrease in productivity due to the extension of the rolling time, an increase in the heating time for obtaining the optimum processing temperature and an increase in energy loss, and if any of the conditions is not satisfied, the quality is deteriorated, There were inconveniences such as a drop in yield. In addition, in the conventional method, the roll rotation is often stopped while the metal material as the material to be rolled is bitten during the rolling, so that a heat crack occurs in the rolling roll, which not only shortens the life of the roll, but also occurs. The metal slab which has been rolled due to cracks may also be damaged, and there are many problems in terms of quality.

[0005]

The object of the present invention is to solve the above-mentioned conventional problems, shorten the rolling time, improve the productivity, and reduce the temperature. An object of the present invention is to provide a metal material rolling device that can reduce energy loss slightly, is excellent in continuous operation for a long time, and can operate efficiently without increasing crop loss.

[0006]

Means for Solving the Problems The present inventors have proposed a method of rolling down a metal material as a material to be rolled such as a metal slab or a steel ingot, in which a behavior of crop loss due to rolling, a forming effect by pressing, a production efficiency, etc. As a result of repeated research on
The inventors have found that various problems that have conventionally occurred can be avoided, and have completed the present invention. That is, the metal slab rolling apparatus of the present invention that has solved the above-mentioned problems, the metal material for rolling, such as a metal slab or a steel ingot sent to the hot rolling step, the thickness and width of the metal material to a predetermined width over the entire length. In a metal material rolling device to be processed so as to be reduced, a pair of press tools facing each other are provided on one or both of an inlet side and an outlet side of a rolling mill with a conveying path line of a metal material for rolling therebetween. It is characterized by having.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a rolling mill in which a pair of vertical rolls 1a and a horizontal roll 1b are opposed to each other with a pass line interposed therebetween. The basic configuration is the same as that of a conventional bulking mill, but in the present invention, A press tool for reducing the front and rear ends of a metal material to be rolled to a predetermined value before rolling by the rolling mill 1 at one or both of the inlet side and the outlet side of this type of rolling mill 1 2 are provided.

[0008] This press tool 2 is used for adjusting the metal material such as metal slabs and steel ingots of various shapes to the required thickness and width according to the rolling process in advance before the subsequent rolling. Instead of the work of preforming the ends of steel ingots and slabs many times in advance by a rolling mill, as in the conventional method such as rolling, etc., it is formed into a predetermined shape by pressing once or a few times. In the first embodiment shown in FIG. 1, the press tool 2 includes a first processing mold 2a and a second processing mold 2a, and a second processing mold 2b and a second processing mold 2b. 2b,
Conventionally, it is attached to a side guide 4 that is provided on the entrance side (the right side in the drawing) of the rolling mill 1 and performs centering in the width direction. When the metal material sent to the rolling mill 1 advances from the right to the left, the left end of the metal material is pressed by the first processing dies 2a and 2a, and then sent to the rolling mill 1 for conveyance. Or it is rolled in the thickness direction by a predetermined amount over the entire length, the right end of the metal material is the second processing mold 2b,
2b. On the return path where the metal material advances rightward from the left side, the right end of the metal material is pressed by the second processing dies 2b and 2b and then sent to the rolling mill 1 to be conveyed or rolled in the thickness direction. The left end of the metal material is pressed by the first processing molds 2a and 2a. After the pressing process at both ends by the press tool 2, the rolling by the rolling mill 1 is performed repeatedly about the same amount as the rolling reduction by the pressing process, so that the crop is generated in the same manner as the conventional bite rolling and the top rolling. Can be enjoyed.

Further, as in a second embodiment shown in FIG. 2, a pressing tool 2 is provided on a first processing die 2a, 2a provided on an outlet side of a rolling mill 1, and a pressing tool 2 is provided on an inlet side of the rolling mill 1. The second processing dies 2b, 2b provided are attached to manipulators 5, 5, which are provided at the entrance and exit of the rolling mill 1 to hold a metal material to be rolled. In this case, the transfer distance of the metal slab or the steel ingot, which is a metal material, can be shortened, so that the processing time can be further shortened.

[0010] With the above-mentioned structure, by using the press tool 2 attached to the side guide 4 of the rolling mill or the manipulator 5, the bite return which has been conventionally performed by the bite rolling by the rolling mill is performed. One or a small number of press treatments before rolling by a rolling mill by operating the side guide 4 and the manipulator 5 slightly slightly without performing the operation for frequent and reciprocating transfer of the metal material. Accordingly, since the front and rear end portions of the metal material can be pressed into a predetermined tapered shape and then rolled by a rolling mill, the transport distance at the time of rolling the metal material to be rolled can be greatly reduced. As a result, it is possible not only to avoid an increase in energy loss for avoiding a decrease in productivity and a decrease in temperature due to the extension of the rolling time and a reduction in quality due to the conventional method, but also to avoid a reduction in quality and the like. Heat cracks can be reliably prevented. When the press tool 2 is mounted on the side guide 4 or the manipulator 5, the press tool 2 can be mounted simply and inexpensively without adding any special device parts.

[0011]

EXAMPLE A slab thickness of 250 mm, a slab width of 1600 mm,
Table 1 shows the results of reducing the width of a metal slab having a slab length of 4 m to a slab width of 1300 mm. As a comparative example, Table 2 shows the results of width reduction by conventional back-meshing rolling.
In the conventional back-meshing rolling method, since the preforming is performed by back-meshing rolling, the processed end is always the end closer to the mill. In other words, the effect of the bite-back rolling method is that a large crop of the trailing edge is not generated because the preformed end becomes the trailing edge, but the rolling is always performed for that purpose. It is necessary to transfer to the opposite side of the machine, and the fourth pass and the fourteenth pass in Table 2 must be provided as empty pass conveyance, which increases the number of passes. On the other hand, in the present invention, as shown in Table 1, the number of passes does not increase, and the rolling time can be reduced to about half compared with the comparative example, and the excellent effect of the present invention can be confirmed. Was.

[0012]

[Table 1]

[00113]

[Table 2]

[0014]

As is apparent from the above description, according to the rolling apparatus for a metal material according to the present invention, the rolling time can be shortened, the productivity can be improved, and the temperature can be reduced slightly and the energy can be reduced. Loss can be reduced,
In addition, it excels in continuous operation for a long time, can operate efficiently without increasing crop loss, and can be installed simply by attaching press tools to the side guides and manipulators of conventional rolling mills. Because of the structure, there is an advantage that it can be provided at low cost. Therefore, the present invention greatly contributes to industrial development as a rolling device for rolling a metal material for rolling metal slabs, steel ingots, and the like, which has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a first embodiment of the present invention.

FIG. 2 is a plan view schematically showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling machine 2 Press tool 4 Side guide 5 Manipulator

Claims (3)

[Claims] 1. A metal material rolling apparatus for processing a metal material for rolling such as a metal slab and a steel ingot sent to a hot rolling step so that the thickness and width thereof are reduced to a predetermined width over the entire length. A metal material rolling apparatus, wherein a pair of press tools facing each other with a metal material conveying path line interposed therebetween are provided at one or both of an inlet side and an outlet side of a rolling mill. 2. The apparatus according to claim 1, wherein the press tool is attached to a side guide of the rolling mill. 3. The apparatus according to claim 1, wherein the press tool is attached to a manipulator of a rolling mill.