JPH03234339A - Method and apparatus for continuously squeezing continuous casting strand - Google Patents

Abstract

PURPOSE:To prevent enlargement of a strand to width direction at the time of forging by holding side face in the width direction of strand with restricting rollers at the time of forging neighborhood of the completing point of solidification in the inner part of continuous casting strand in the thickness direction. CONSTITUTION:At the time of forging the thickness direction of strand at the position, where the unsolidified part in the inner part of continuous casting strand 1 drawn from a continuous casting apparatus perfectly solidifies, with one pair of anvils 2, 2, the rollers 3, 3 for preventing the enlargement in the width direction at both side parts in the width direction of strand 1, are arranged. These restricting rollers 3 of the width direction can be shifted following the shift with drawing from a continuous casting mold for the continuous casting strand 1 and deformation in the width direction of strand is prevented at the time of forging the strand 1 in the thickness direction with the anvils 2 and correction of size in the width direction after forging is unnecessary.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a continuous forging method and device for continuously cast strands, and in particular to a method for continuously forging continuously cast strands and an apparatus therefor. This is what we are trying to effectively avoid.

(Prior art) A slab strand pulled out of a continuous casting mold is subjected to a forging process near the solidification completion point using a pair of reciprocating anvils that sandwich the conveyance path line of the continuous casting strand above and below. Many proposals have already been made regarding improving the internal quality of continuously cast slabs (Japanese Patent Application Laid-Open No. 1983-1999).
230262, JP-A-63-183765).

By the way, in such forging processing, depending on the amount of processing, an extreme width expansion may occur, and in such cases, extra effort is required to reduce the width to a specified width in a later process. This could lead to a decrease in productivity.

(Problems to be Solved by the Invention) It is an object of the present invention to propose a new forging method and device that can effectively avoid the conventional problems that have arisen when pressing continuously cast strands using an anvil. It is a purpose.

(Means for Solving the Problems) The present invention is directed to a pair of reciprocating anvils sandwiching the continuous casting strand on both sides in the thickness direction, in the vicinity of the solidification completion point of the continuous casting strand pulled out from the continuous casting mold. This is a continuous forging method for continuously cast strands, characterized in that the forging process is carried out while constraining the width direction in the forging area of the continuously cast strand.

The present invention also provides an apparatus comprising a pair of anvils that sandwich a continuous cast strand on both sides in the thickness direction and perform forging in the vicinity of the solidification completion point of the continuous cast strand by repeatedly approaching and separating the anvils from each other. This forging device is characterized by having at least a pair of width restraining rollers that sandwich the width end side surfaces of the continuously cast strand on both sides. Here, in the apparatus with the above configuration, a guide whose contact surface with the continuous casting strand is flat may be used instead of the width restraining roller. When such a guide is applied, it is difficult to pull out the continuous casting strand. It is necessary to provide a follow-up mechanism to follow. In addition, such a guide can also be provided with a retraction mechanism that can move the main body of the guide in a direction intersecting the conveyance path line of the continuous casting strand in order to avoid scratches on the surface of the continuous casting strand.

FIGS. 1(a) and 1(b) show an example of a forging press according to the present invention, and number 1 in the figures indicates a continuous casting mold (not shown).
Continuously cast strand pulled out, 2 is continuous cast strand 1
This anvil 2 is a pair of reciprocating anvils sandwiching the thickness direction of the continuous casting strand 1 on both sides, and this anvil 2 is designed to forge a predetermined amount of the area near the solidification completion point of the continuous casting strand 1 by repeating approaching and separating from each other. It has become. Also, 3
is a width restraining roller that restrains the width direction of the continuously cast strand 1 in the forging region, and this roller 3 serves to prevent the width of the continuously cast strand 1 from expanding during the forging process.

(Function) If the width of the continuous cast strand expands too much during the forging process of the continuous cast strand during the drawing movement, it will take time and effort to reduce it to the specified width in the later process. A decline in productivity is inevitable.

In this invention, since the forging region of the continuously cast strand 1 is constrained in its width direction while being forged by the anvil 2, there is no possibility of extreme width expansion. Note that when the forging process is performed with the width constrained, there is an advantage that a sufficient forging effect can be applied to the inside of the forge.

Next, Fig. 2(a) shows an example in which a slide guide 4 for preventing width expansion, which is a mechanism that moves to follow the drawing movement of the continuous casting strand 1, is installed in place of the width restraining roller 3.
Shown in (b). This slide guide 4 includes, for example, a guide body 4' having a flat surface in contact with the width end side surface of the continuous casting strand 1, and a holder 6 which incorporates this guide body 4' with a roller bearing or a slide bearing 5 and holds it slidably. , and a block 7 which fixedly holds the holder 6 and has one end swingably held via a pivot pin e. A hydraulic cylinder S connected to the guide body 4' is installed in the block 7, and the hydraulic cylinder S causes the guide body 4' to accompany the drawing movement of the continuous casting strand 1. In Fig. 2(a), Albin 2' indicates the starting position for forging, and Albin 2 indicates the position at the end of forging. The restraint state is continued until the position of anvil 2 is reached. Next, cylinder S moves guide body 4'
is pulled back to its original position, and this operation is performed in conjunction with the operation of the anvil 2. The restraining force (reaction force due to width expansion during forging) applied to the guide body 4' during width restraint is applied to the bearing 5,
A stopper 8 that supports the holder 6 on the back side via the holder 6
receives. The position change from the anvil 2' to the albin 2 is to follow the continuous drawing movement of the continuous casting strand 1, and in order to make the guide body 4' follow this, the guide body 4' and the holder are A bearing 5 is disposed between the bearing 6 and the bearing 6. In addition, the continuous cast strand 1 is pulled out by pinch rolls (not shown), but due to the width restriction during forging, the pulling speed may change.
In such a case, the guide body 4' may be moved by the cylinder S in conjunction with the drawing speed of the slab strand 1.

When pulling back the guide body 4' from the position of the anvil 2 where the forging process has been completed to the position of the anvil 2', which is the starting position of the next forging process, the surface of the slab strand 1 that is in contact with the guide body 4' must be rubbed. There is a risk of injury. In order to prevent the occurrence of scratches, it is preferable to add the following mechanism as necessary. That is, the guide body 4
A hydraulic cylinder S' is provided and connected to the block 7. When the guide body 4' is returned to its original position after being moved together with the continuous casting strand 1, the block 7 is moved in a direction away from the continuous casting strand 1. This advantageously avoids the occurrence of scratches on the width sides of the continuously cast strand l.

Note that this function is not essential and can be used to minimize the occurrence of scratches. This is because the widening of the continuous casting strand occurs in the rolled part, and the region through which the guide body 4' is pulled back is the unrolled part, so there is no possibility that the continuous casting strand 1 and the guide body 4' will come into contact with each other. This is because it may be omissible depending on the use of the continuous casting strand.

In the above retraction mechanism, the reaction force accompanying the forging of the continuous casting strand 1 can be received by the cylinder S', but the cylinder S
In order to reduce the size of block 7, it is desirable to use a stopper 8, and by making the stopper 8 movable in the conveyance direction of the continuous casting strand 1 or in a direction crossing it, the swinging motion when the block 7 is retracted is prevented. You can avoid interfering with exercise.

(Example) A continuously cast strand (steel type 545C) having a width of 340 m and a thickness of 270 m was cast at a casting speed of 1.0 m/sin, and a structure as shown in Fig. 1 above was applied to the forging area of the strand. A width restraining roller was installed, and a forging process with a rolling reduction (thickness direction) of 80 mm was performed under the restraint of this roller.

The anvil used in the forging process had a convex central part so that the unsolidified part existing in the central part of the continuous casting strand could be effectively rolled down, and a width restraining roller was used. For diameter 250 rtx
a. Three pieces with a length of 260 M (pitch 260
m) The one built into the holder was used, and the left and right installation intervals of the width restraining rollers were set at 345, taking into account allowances for bulging, etc.

As a result, when the width of the continuously cast strand is not restricted during forging, the width of the strand changes from 340 g to 4 g.
00 m, whereas according to the present invention, the width of the strand is within the installation interval of the restraining rollers,
It was confirmed that width expansion could be sufficiently suppressed.

(Effects of the Invention) Thus, according to the present invention, it is possible to prevent the continuous casting strand from widening during forging, so there is no need to add extra steps, productivity can be improved, and manufacturing costs can be advantageously reduced. .

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are diagrams illustrating the configuration of the apparatus according to the present invention. FIGS. 2(a) and 2(b) are diagrams showing other examples of the apparatus according to the present invention. ■...Continuous casting strand 2...Anvil 3.
・・Width restraint roll 4・・Slide guide 4
'...Guide body 5...Slide bearing 6.
...Holder 7...Block 8...
Stopper S, S'...Hydraulic cylinder e
...Pivot pin Fig. 1 8 (b)

Claims (1)

[Claims] 1. The region near the solidification completion point of the continuous casting strand pulled out from the continuous casting mold is continuously forged with a pair of reciprocating anvils that sandwich the continuous casting strand on both sides in the thickness direction. A continuous forging method for continuously cast strands, characterized in that during processing, the forging process is carried out while constraining the width direction in the forging region of the continuous cast strand. 2. In an apparatus equipped with a pair of anvils that hold the continuous cast strand on both sides in the thickness direction and press the area near the solidification completion point of the continuous cast strand by repeatedly approaching and separating them from each other, the above apparatus What is claimed is: 1. A forging device comprising at least a pair of width restraining rollers sandwiching the width end side surfaces of the press on both sides. 3. The device according to claim 2, wherein the width restraint roller is a slide guide that is movable following the drawing movement of the continuous casting strand. 4. The apparatus according to claim 3, wherein the slide guide has a retraction mechanism movable in a direction intersecting the conveyance path line of the continuous casting strand.