JPH07284806A - Online joining method and online joining machine for sheet bars in perfect continuous rolling - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pressure welding method with a large crimping force of a sheet bar, which can be crimped by a joining machine fixed on a pass line. The vertical block 13 in the upper structure 22 is lowered and the vertical block 1 in the lower structure 22 'is lowered.
By raising 3 ′, the two small blocks 17, 17 ′, 18 and 18 ′ in the upper and lower parts respectively are moved to the rear end 2-1 of the leading seat bar 2 and the leading end 3-1 of the following seat bar 3. And are pressed in the vertical direction and compressed in the pass line direction so that the leading seat bar 2 and the following seat bar 3
Join with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet bar between a rough rolling process and a finish rolling process using a joining machine fixedly installed on a pass line when performing a completely continuous hot rolling.
The present invention relates to a method for joining rolled materials such as rods online.

[0002]

2. Description of the Related Art Conventionally, for example, in hot tandem rolling of a thin plate, a slab sent from a steelmaking process is roughly rolled into a sheet bar, and the sheet bar is rolled by a multi-stand hot rolling machine to form a coil. It is wound into a thin plate coil of a predetermined size. However, in the finish rolling, since the sheet bar has a finite length, unsteady rolling is inevitable when the leading edge of the sheet bar is caught and the trailing edge of the sheet bar is slipped out. For this reason, from the viewpoint of preventing passing defects such as narrowing of the plate, a method of slowing the passing speed at the time of passing the leading and trailing ends of the sheet bar is adopted, which is a factor that hinders productivity. There is.

As a countermeasure against this, it has been considered that a sheet bar having a finite length is joined between a rough rolling mill and a finish rolling mill to perform so-called endless rolling. That is, the problem is to join the sheet bars at the portion surrounded by the dotted line 5 in FIG. Here, 1 is a roll for finish rolling, 2 is a leading material of a sheet bar which is a non-rolling material, 2-1 is a trailing end of the leading material, 3 is a trailing material, 3-1 is a leading edge of the trailing material. Reference numeral 4 is a table roller.

Japanese Unexamined Patent Publication (Kokai) No. 57-109574 discloses a process comprising a rough rolling mill, a coil box, a heat retaining device, an unwinding device, a movable joining machine (swing roller type table) and a finishing rolling mill. There is. In this method, joining is performed by welding. Therefore, it takes time to join the entire rear end portion of the preceding material and the leading end portion of the following material, and there is a problem that the traveling distance of the mobile joining machine becomes long.

Further, as an example of a fixed type welding machine, Japanese Patent Laid-Open No.
1-158285 and JP-A-61-42768.
The publication discloses a process using electric heating and upset. In this method, since a fixed welding machine is used, a swing roller type table is unnecessary. However, considering that a seat bar storage device such as a looper is required, and the minimum bending radius that does not cause plastic deformation of the seat bar is often on the order of about 25 m, enlargement of equipment such as a looper is avoided. There is a drawback that it is not possible to increase the cost.

[0006]

In the above-mentioned conventional technique, it takes a long time to weld the seat bar, so that there is a problem that the equipment cost becomes high. In order to solve this problem, it is necessary to develop a technique capable of joining in a short time.

As a means for joining in a short time, considering that the material to be rolled is already at a high temperature of about 900 to 1300 ° C., solid-state joining by applying pressure is the most efficient. In order to press the end surface of the trailing end of the preceding material and the end surface of the leading end of the trailing material under pressure, a force must be applied in the direction in which both surfaces are crimped, as indicated by the arrow in FIG. As a method for this purpose, two methods are commonly known, that is, the forge welding method and the pinch roller method.

FIG. 4 shows the forge welding method. here,
Reference numeral 6 is a punch for forging the front and rear ends of the seat bar, and a force is applied in the direction of the thick arrow, but by this action the front and rear ends of the sheet bar are pressed in the direction of the dotted arrow to be crimped. According to this method, it is possible to join the sheet bars in a relatively short time. FIG. 4B shows the width direction shape of the sheet bar after joining, but the joining portion 8 has a wide width, which causes various rolling problems.

The pinch roller method is shown in FIG. The pinch roller method is a method in which the pressure force is applied to the front and rear ends of the sheet bar in the direction of the dotted arrow by the frictional force of the roller 9. However, since the pressure bonding force is weak in this method, it is necessary to raise the front and rear ends of the sheet bar to a high temperature near the melting point. Further, if the number of rolls is increased, the pressure bonding force can be increased, but the surface flaws on the surface of the sheet bar are also increased at the same time, which causes the loss of the commercial value of the product.

Therefore, in order to join by crimping, a new method without such a defect must be developed. Especially, if the joining can be performed without using the traveling stand, the merit is extremely large.

[0011]

[Means for Solving the Problems] As a result of various studies on a pressure welding method with a large pressure force of a sheet bar, which can be pressure-bonded by a welding machine fixed on a pass line,
We were able to develop the following method.

The method will be described with reference to FIGS. 6 and 1 which are principle diagrams. FIG. 6 shows the positional relationship between the joining machine 10 and the sheet bar immediately before crimping. The preceding material 2 is biting into the finish rolling mill and rolling, and the trailing material 3 approaches the preceding material and is running at approximately the same speed as the preceding material. In order to join the portion 2-1 and the leading end portion 3-1 of the trailing member during traveling, a vertical block 13 which is movable only in the vertical direction and has an axis 12 in the vertical direction, and the vertical block and the inclined surface 14. And a horizontal block 16 which has a horizontal axis 15 and which is slidably in contact with each other via a horizontal axis and is movable forward not only in the vertical direction but also in the horizontal direction as the vertical block moves. The lower surface of the horizontal block slidably contacts the two small blocks 17 and 18 through inclined surfaces 19 and 20, and the inclined surface corresponds to the lowering of the horizontal blocks. A group that approaches each other An upper structure 22 having a mating structure and a lower structure 22 'having a block and a small block arrangement that are substantially symmetrical with respect to a horizontal plane including the upper structure and the pass line are separated by a pass line. And the splicing machine 1 arranged opposite to each other
0 is fixedly installed on the pass line, and almost at the same time when the trailing ends of the leading material and the leading end of the trailing material of the two running sheet bars reach the substantially central portion 23 of the joining machine 10. , The vertical block 13 in this structure is lowered along the guide 21, and the vertical block 13 'is guided by the guide 21'.
By raising along the horizontal blocks 16, 1
8'moves vertically and horizontally, with two small blocks 17, 17 ', 18, respectively on the top and the bottom.
18 'also moves in the vertical direction and the horizontal direction to press the rear end of the preceding material and the front end of the following material in the vertical direction and to compress along the pass line direction, so that the preceding material and the following material are compressed. Join and. It should be noted that the dash of the number given to the lower structure portion indicates that it corresponds to the same number of the upper structure.

[0013]

FIG. 1 shows the positional relationship between the joining machine and the sheet bar during pressure bonding by the above method. The blocks 13 and 13 'inside the welding machine 10 are pressed down at a speed of V1 by a cylinder block displaced by a hydraulic device (not shown). As this moves, horizontal blocks 16 and 16 '
Moves in the direction of the arrow shown in the figure at a speed V2 and also moves in the vertical direction. At this time, there is a relationship of V2 = V1cotθ. However, θ is the angle (tilt angle) of the inclined surfaces of the vertical blocks 13 and 13 ′ and the horizontal blocks 16 and 16 ′.

Since the small blocks 17 and 18 have the inclination angles φ1 and φ2 in the opposite directions, the small blocks 17 and 18 slide in the opposite directions in the horizontal direction as the blocks 16 move in the horizontal direction and the vertical direction. While fitting, it also exerts downward compression. Similarly, as the block 16 'moves horizontally and vertically, the small blocks 17', 18 'also press each other and exert an upward force on the seat bar. Due to these forces, the front and rear ends of the seat bar are crimped.

Inclined surfaces 14, 14 ', 19, 19', 2
0, 20 'is smooth, but the surface 24, 24', 25, 25 'where the small block contacts the seat bar presses the seat bar by the frictional force acting on this surface, so the surface roughness is rough. Good. However, if it is made too rough, the quality of the surface of the product may be deteriorated, so that an appropriate surface roughness is required.

It is desirable that the scales on the end faces of the front and rear end portions of the sheet bar to be crimped by this method be dropped by a scale breaker immediately before crimping. Various methods such as a conventional method of spraying a gas and a shot peening method can be applied to this. In order to return the horizontal cylinder to the original position after crimping, various conventional techniques such as hydraulic system and mechanical system can be applied.

As a result of various studies on techniques for accurately aligning the axial centers of the trailing edge of the preceding material and the leading edge of the following material, it has been revealed that the following method is effective. That is, as shown in FIG. 7, the trailing edge portion 2-1 of the preceding material and the leading edge portion 3 of the following material 3
1 are small blocks 1 arranged above and below the joining structure 10.
Immediately before passing through the exit side of 7, 17 ', by starting the crimping of the sheet bar, the small part of the trailing end of the preceding material is also sandwiched by the small blocks 17, 17', so that the front and rear of the preceding material can be compressed. It has been clarified that the axis of the row material can be surely matched. Immediately after the leading material trailing edge 2-1 and the trailing material leading edge 3-1 enter the entry side of the small blocks 18, 18 'arranged above and below the joined structure 10, the sheet bar is crimped. The same effect can be obtained by starting.

As described above, the technique for joining the sheet bars by the crimping force by the joining structure 10 has been established. In this method, the crimping force affects the rolling behavior of the first stand of the finish rolling mill, As a result, the strip thickness accuracy on the delivery side of the finish rolling mill may be affected. Horizontal block 1
This effect can be eliminated by making the traveling speed V2 of 6, 16 'equal to the traveling speed of the seat bar.

In the above description, the lower part of the joining machine has almost the same structure as the upper part, but as a method of simplifying the lower structure, as shown in FIG.
However, substantially the same effect can be obtained by using the small blocks 27 and 28 that support the pressing force from the upper structure 22 and the lower structure 26 that includes the rollers 29 that allow the blocks to move horizontally. .

[0020]

【Example】

(Example 1) A continuous hot pressure welding test was conducted under the following conditions with the equipment configurations shown in FIGS. <Sheet bar> Material: Low carbon A1 killed steel Speed: 60 mpm (on the entry side of the finishing rolling mill) Temperature: 1000 ° C (on the entry side of the finishing rolling mill) Dimensions: Sheet thickness 50 mm, sheet width 1100 mm End face dimension: By shear The shape of the cut surface is shown in FIG. In the figure, t is the plate thickness. The approximate dimensions of the end face are x ₁ = 25 mm y ₁ = 10 mm x ₂ = 10 mm y ₂ = 26 mm. <Rolling conditions> Number of finishing stands: 6 Reduction ratio of the first stand: 50% Finishing thickness: 3.2 mm <Joining machine> Upper and lower compressive force (F): 476 tons Inclination angle: θ = 30 ° φ ₁ = 30 ° φ ₂ = 45 ° Joining time: 1 second Horizontal length of horizontal block: 1.5 m Vertical height of horizontal block: 0.8 m Horizontal length of small blocks 17, 17 ', 18, 18' : 0.3 m <Scale removal> The scale was removed by blowing high-pressure oxygen immediately before joining.

FIG. 9B schematically shows the shape after crimping, but the shape is almost the same in the width direction.
90% or more of all cross sections were joined. Further, finish rolling was continued, but no fracture occurred during rolling. The variation in the finished plate thickness was within 0.3% of the plate thickness except for the 0.3 m portion before and after the joint, which was very good.

(Embodiment 2) The equipment is under the same conditions as in Embodiment 1, but by the method of FIG. 7, the crimping timing by the horizontal block is made faster than in Embodiment 1, and the trailing edge of the preceding material is made by the small block. By sandwiching even a small part of the part, the axis of the leading material and the material of the trailing material were more accurately aligned and tested. As a result, as in Example 1, 90% or more of the entire cross section was adhered, and no fracture occurred during rolling.

(Embodiment 3) As shown in FIG. 8, a lower structure composed of two small blocks for supporting the pressing down force from the upper structure and rollers for horizontally moving the blocks is used. I did a test. The test conditions for the upper structure are the same as in Example 1 except that the crimping force is 952 tons. The conditions for the lower structure are as follows. <Lower Structure> Small block size: 1.5 m × 0.3 m Roller: Diameter 50 mm × 20 In this case, the very same result as in Example 1 was obtained.

[0024]

According to the present invention, as described above, since the joining is completed with the fixed stand in a very short time, it is not necessary to remodel the existing actual equipment. In addition, since the bonding in the full width direction is easily performed, many useful effects such as no breakage trouble during rolling can be obtained.

[Brief description of drawings]

FIG. 1 is a principle view of the present invention (showing a joining mechanism at the time of crimping).

FIG. 2 is a diagram showing a joining position on a rolling line.

FIG. 3 is a diagram showing a direction of a pressing force of a seat bar.

FIG. 4A is a diagram showing a joining mechanism by forging, and FIG. 4B is a diagram showing a shape in the width direction of the seat bar after being joined by forging.

FIG. 5 is a diagram showing a crimping mechanism using pinch rolls.

FIG. 6 is a principle view of the present invention (mechanism of a bonding machine).

FIG. 7 is a diagram illustrating a method of improving centering of a preceding material and a following material.

FIG. 8 is a diagram illustrating a method for simplifying the structure of the joining machine.

9A is a front and rear end shape of the seat bar used in the embodiment, and FIG. 9B is a shape after joining the seat bars.

[Explanation of symbols]

1 Finishing Roller 1st Stand 2 Seat Bar (Preceding Material) 2-1 Preceding Material Rear End 3 Sheet Bar (Rearing Material) 3-1 Trailing Material Tip 4 Table Roller 5 Joining Position 6 Forging Punch 7 Forging Punch for clamping 8 Width shape of joint by forging 9 Pinch roll 10 Joiner 11 Path center 12 Axis of vertical block 13,13 'Vertical block 14,14' Sliding between vertical block and horizontal block Moving surface 15 Horizontal block axis 16, 16 'Horizontal block 17, 17', 18, 18 'Small block 19, 20 Sliding surface between horizontal block and small block 21 Vertical block guide 22 Superstructure 22 'Lower structure 23 Joining part between the trailing end of the preceding material and the leading end of the following material 24 Surface where the small block 17 contacts the seat bar 25 Small block 18 Horizontal block moving roller of the small block 29 the lower structure of the surface 26 lower structure 27 and 28 lower structure in contact with the sheet bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Watanabe 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Hiroe Nakajima 20-1 Shintomi, Futtsu City, Chiba Prefecture New Japan Steel Engineering Co., Ltd.

Claims (4)

[Claims] 1. A vertical block movably supported in a vertical direction on a support fixed on a pass line, and a vertical block movably supported in a vertical direction and a horizontal direction on the support and inclined with respect to the vertical block. A horizontal block that is movably contacted via a surface and is movable in the vertical direction and the traveling direction of the seat bar in accordance with the movement of the vertical block, and a horizontal block that is in contact with the lower part of the horizontal block via an inclined surface. An upper structure that is composed of two small blocks that are provided, and that has a combined structure such that the two small blocks approach each other as the horizontal block descends, and the upper structure and the pass line are sandwiched. With a lower structure having a block arrangement that is substantially symmetrical with respect to a horizontal plane including the pass line and is opposed to the vertical block in the upper structure. Lowering the vertical block in the lower structure,
Two small blocks at the top and two at the bottom hold the trailing edge of the preceding sheet bar and the leading edge of the following sheet bar in the vertical direction, and compress in the pass line direction so that the leading sheet bar and the following sheet bar An online joining method for sheet bars in perfect continuous rolling, which comprises joining sheets. 2. The on-line joining method for sheet bars in complete continuous rolling according to claim 1, wherein the lower structure is composed of two horizontally movable small blocks arranged to face each other across a pass line. , Each small block is located directly below the small block of the upper structure, and by using a joining machine that can move up and down, by lowering the vertical block in the upper structure, each of the upper and lower parts The two small blocks press the rear end of the preceding seat bar and the front end of the following seat bar in the vertical direction, and compress in the pass line direction,
An online joining method for sheet bars in perfect continuous rolling, which comprises joining a preceding sheet bar and a succeeding sheet bar. 3. An on-line joining machine for joining sheet bars running on a pass line back and forth, comprising: a vertical block movably supported in a vertical direction on a support fixed on the pass line; The support is movably supported in the vertical and horizontal directions, movably contacts the vertical block through an inclined surface, and can move in the vertical direction and the traveling direction of the seat bar according to the movement of the vertical block. A horizontal block and two small blocks juxtaposed on the lower part of the horizontal block so as to be in contact with each other via an inclined surface. The two small blocks approach each other as the horizontal block descends. An upper structure having a combined structure, and a block which is arranged opposite to the upper structure with a pass line interposed therebetween and is substantially symmetrical with respect to a horizontal plane including the pass line. Online bonder sheet bar in a completely continuous rolling, characterized the lower structure, that consists of having an arrangement. 4. The on-line joining machine for sheet bars in full continuous rolling according to claim 3, wherein the lower structure is composed of two horizontally movable small blocks which are arranged to face each other across a pass line. An online joining machine for sheet bars in complete continuous rolling, characterized in that each small block is located directly below the small block of the upper structure and can be moved up and down.