JPH0663774A - Sheet bar joining method by slide-pressure welding - Google Patents

Abstract

PURPOSE:To attain sure joining by applying enough plastic deformation and to cut and remove the burr. CONSTITUTION:A preceding sheet bar gripping part 12 which clamps the neighborhood of the rear end part of the preceding sheet bar 2 and provided with cutters 7a, 7b projecting to the rear side in parallel to the preceding sheet bar 2, and the following sheet bar gripping part 29 which clamps the top end part of the following sheet bar 3 confronting to the rear end part and provided with cutters 22a, 22b confronting to the cutters 7a, 7b are provided. Then, while measuring the distance between the gripping parts 12, 29, until the gripping parts 12, 29 are approached to the prescribed distance, the pressing by approaching the gripping parts 12, 29, and the slide pressing joining is executed while pushing out the oxide substance on the joining surface of the sheet bars 2, 3 with the up and down movement of the gripping part 29, then the burr generating on the joining surface of the sheet bars 2, 3 is cut and removed with cutters 7a, 22a, 7b, 22b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding contact welding method for seat bars.

[0002]

2. Description of the Related Art A conventional sheet bar joining apparatus is, for example,
It is described in JP-A-60-244401, etc.,
The sheet bar joining apparatus disclosed in Japanese Patent Laid-Open No. 60-244401 directly heats and heats the rear end portion of the preceding sheet bar and the leading end portion of the succeeding sheet bar over the entire width by using an electric heating device. By butt-pressing the rear end surface of the preceding sheet bar and the front end surface of the following sheet bar, which have risen in temperature, against each other using a pressing device, the preceding and succeeding sheet bars are joined over the entire width. is there.

Further, at least one of the rear end of the preceding sheet bar and the front end of the following sheet bar is fixed, and the other end is relatively predetermined toward one end. By pressing with pressure, the joint surface at the other end is slid against the joint surface at the other end for a preset period of time, and friction force is applied to both joint surfaces so that the rear end and the rear end of the preceding sheet bar A friction welding method for joining the front end of the row sheet bar has also been proposed. According to this method, since the temperature rises due to the sliding pressure contact, heat input for heating the seat bar can be saved or eliminated.

[0004]

However, in the seat bar joining apparatus disclosed in Japanese Patent Laid-Open No. 60-244401, an electric heating device is used for the rear end portion of the preceding sheet bar and the front end portion of the succeeding sheet bar. Since the temperature is raised to a temperature at which pressing and joining can be performed, there is a problem that a large-capacity heating device is required and that power consumption required for heating is large.

In the friction welding method, the joining surface between the rear end portion of the preceding sheet bar and the leading end portion of the following sheet bar is slid while applying a pressing force to apply a frictional force to the joining surface. Since they are joined, plastic deformation occurs on the joint surface toward the outside and burrs are formed,
There is a problem in that the burrs are broken and bitten in the process of continuous rolling which is continuously performed, and thus the sheet bar is damaged or the rolling roll is damaged.

In view of the above-mentioned circumstances, the present invention provides sufficient plastic deformation to completely remove the oxide on the joint surface to ensure reliable joining and to remove excessive flash. It is an object of the present invention to provide a sliding pressure welding method for a seat bar as described above.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a leading seat bar grip having a cutter that clamps the trailing end of a leading seat bar from above and below and that projects to the rear on both sides in the thickness direction of the leading seat bar. And a clamp is provided from above and below in a state where the leading end of the trailing seat bar faces the trailing end of the preceding seat bar, and another cutter is provided at a position facing the cutter of the preceding seat bar gripping portion. A trailing seat bar grip portion is provided, and a distance meter for measuring the distance between the leading seat bar grip portion and the trailing seat bar grip portion is further provided on one grip portion, and the leading seat bar grip portion and the rear seat bar grip portion are provided. By the pressure applied by the approach of the row seat bar grip and the relative movement in the direction orthogonal to the seat bar,
Sliding pressure welding is performed until the preceding sheet bar gripping portion and the succeeding sheet bar gripping portion are close to each other by a predetermined distance while pushing out the oxide of the sheet bar joint surface as a flash, The present invention relates to a sliding pressure welding method for a sheet bar, which comprises cutting and removing burrs generated at a joining portion between a preceding sheet bar and a following sheet bar by the proximity of the cutter.

[0008]

[Operation] A position separated by a required distance from the rear end portion of the preceding seat bar is clamped by a preceding seat bar grip portion and a succeeding seat bar grip portion at a position separated by a required distance from the trailing seat bar front end portion, respectively. Then, the leading sheet bar gripping portion and the trailing sheet bar gripping portion are brought close to each other to bring the trailing end portion of the leading sheet bar and the leading end portion of the trailing sheet bar into contact with each other and pressurize at the same time. The grip portion is relatively moved in a direction orthogonal to the seat bar, and the joining surface of the two sheet bars is frictionally heated while applying a pressing force until the leading seat bar grip portion and the trailing sheet bar grip portion are close to each other by a predetermined distance. At this time, the joint surfaces of the two sheet bars that are frictionally heated are easily deformed by the temperature rise and are pressed against each other, so that plastic deformation occurs toward the outside and burrs can occur. When sufficient flash is made, stop the relative movement of the grip. At this time, the joining surfaces of the two sheet bars are covered with an active metal surface to complete the joining. Further, the flash formed on the joint surface of the two sheet bars is cut and removed by the proximity of the cutter.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an example of an apparatus for carrying out the method of the present invention, in which 1 is a hot rolling line and 2 is a preceding line running on the hot rolling line 1 in the direction of arrow A. A sheet bar 3 indicates a trailing sheet bar that is being fed behind the preceding sheet bar 2, and the preceding sheet bar 2 and the following sheet bar 3 are rails laid in the middle of the hot rolling line 1. The joining device 5 is provided on the upper part 4 so as to be able to run, and is joined during running.

The structure of the joining device 5 is as follows.

In the figure, reference numeral 6 denotes a traveling carriage which can travel along the rail 4, and for clamping the rear end portion 2a of the preceding seat bar 2 on the downstream side (the right side in the drawing) of the traveling carriage 6 in the line. By arranging a pair of upper and lower clamp members 9, 10 and connecting the upper clamp member 9 to a vertically extendable and contractible clamp cylinder 11 and fixing the lower clamp member 10 to the traveling carriage 6 The clamps 7a, 7b and the stoppers 8a, 8b projecting to the upstream side of the line (left side in the drawing) are integrally provided on each of the clamp members 9, 10 of the preceding sheet bar gripping portion 12 which constitutes the portion 12.

Further, window portions 13 and 14 are formed at upper and lower positions sandwiching the seat bars 2 and 3 on the line upstream side (left side in the drawing) of the preceding seat bar grip portion 12 of the traveling carriage 6, and the respective window portions are formed. The upset blocks 15 and 16 are slidably fitted in the lines 13 and 14, respectively, and the upset blocks 15 and 16 are connected to the upset cylinders 17 and 18 which can expand and contract in the line direction, respectively. Further, guide arms 20 and 21 are pivotally attached to the upset blocks 15 and 16 so as to be vertically tiltable, and the tip ends of the guide arms 20 and 21 face the clamp members 9 and 10 to be followed. A pair of upper and lower clamp members 24 for clamping the tip portion 3a of the seat bar 3,
An urging device 26 having a spring or the like for attaching 25 to urge the lower guide arm 21 upward and a clamp cylinder 28 capable of moving the upper guide arm 20 up and down via a friction sliding device 27 described later. Each of the traveling carriages 6 is provided with a trailing seat bar gripping portion 29, and further, each of the clamp members 24 and 25 projects to the downstream side of the line (right side in the drawing) and the cutters 7a and 7b and the stopper 8 are provided.
The cutters 22a and 22b and the stoppers 23a and 23b facing the a and 8b, respectively, are integrally provided.

Further, a distance meter 34 for measuring the distance between the leading sheet bar gripping portion 12 and the trailing sheet bar gripping portion 29 is attached to the clamp member 10 below the preceding sheet bar gripping portion 12. There is.

In the friction sliding device 27, a clamp block 31 is slidably fitted vertically to a window portion 30 formed at a position above the tip of the guide arm 20 above the traveling carriage 6, and the clamp block is slid vertically. 31 is connected to the clamp cylinder 28, and the clamp block 3
1, a friction sliding rod 33 is connected between the eccentric portion of the eccentric shaft 32 which is rotationally driven by an external drive device (not shown) and the tip of the upper guide arm 20.

In the figure, reference numerals 35a and 35b denote burrs formed by sliding pressure welding between the rear end portion 2a of the preceding sheet bar 2 and the front end portion 3a of the following sheet bar 3.

The trailing end portion 2a of the preceding sheet bar 2 and the leading end portion 3a of the trailing sheet bar 3 traveling on the hot rolling line 1 enter the inside of the joining device 5 to form the trailing end portion 2a of the preceding sheet bar 2. If the leading end portion 3a of the trailing seat bar 3 is located at the center of the leading sheet bar grip portion 12 and the following sheet bar grip portion 29, the following operation is performed.

That is, as shown in FIGS. 1 and 3, by extending the clamp cylinder 11 and lowering the clamp member 9, the position of the preceding seat bar 2 is separated from the rear end portion 2a of the preceding seat bar 2 by a required distance. The tip end portion 3 of the trailing seat bar 3 is clamped by the grip portion 12, the clamp cylinder 28 is extended, and the clamp member 24 is lowered via the clamp block 31 and the friction slide connecting rod 33.
The trailing sheet bar grip portion 29 clamps a position separated from the a by a required distance. At this time, the distance meter 34 attached to the clamp member 10 below the preceding seat bar grip portion 12
Is adjusted so that the required distance L between the leading seat bar gripping portion 12 and the succeeding seat bar gripping portion 29 is adjusted.

Subsequently, the upsetting cylinders 17 and 18
Of the trailing seat bar 2 through the upsetting blocks 15 and 16 and the guide arms 20 and 21.
The clamp members 24 and 25 of 9 are urged toward the leading sheet bar grip portion 12 side, and the leading end portion 3a of the trailing sheet bar 3 is pressed against the trailing end portion 2a of the leading sheet bar 2 to apply pressure.

The leading end portion 3a of the trailing seat bar 3 is pressed against the trailing end portion 2a of the leading seat bar 2 so that the leading end portion 3a.
When the joint surface between the rear end portion 2a and the rear end portion 2a is pressed, the eccentric shaft 32 is rotationally driven by an external driving device (not shown), and the friction sliding rod 33 fitted to the eccentric portion of the eccentric shaft 32 is attached. The vertical movement is caused to vertically move the clamp member 24 above the trailing seat bar grip portion 29. At this time, since the clamp member 25 below the trailing seat bar gripping portion 29 is biased upward by the biasing device 26, the leading end portion 3a of the trailing seat bar 3 is fixed to the upper clamp member 24. In the clamped state, it follows the upper clamp member 24 and moves up and down.

Then, the joining surface of the leading end portion 3a of the trailing seat bar 3 is slid up and down while applying a pressing force to the joining surface of the trailing end portion 2a of the preceding sheet bar 2, and a frictional force is applied to both joining surfaces. As a result, the joint surfaces of the end portions 2a, 3a of the leading seat bar 2 and the trailing seat bar 3 rise in temperature and are easily deformed, so that as shown in FIG. Deformation occurs, and the oxide film (oxide) covering the ends 2a and 3a becomes burrs 35a and 35b and is extruded to the outside. When the pressure contact is further advanced, the burrs 35a and 35b grow as shown in FIG.
a and 22a sandwich the flash 35b by the cutters 7b and 22b, respectively.

In this state, friction is stopped so that the preceding seat bar 2 and the following seat bar 3 are at the same height position, and then the rear end portion 2a of the preceding seat bar 2 and the leading end portion of the following seat bar 3 are stopped. The joint portion 3a is further pressed to press the active metal surface from which the oxide film (oxide) has been removed, so that more complete joining is performed. At this time, the flash 35a is cut by the approach of the cutter 7a and the cutter 22a, and the flash 35b is cut by the approach of the cutter 7b and the cutter 22b.

Finally, as shown in FIG. 6, the burrs 35a and 35b are moved forward by releasing the clamps of the leading sheet bar 2 and the trailing sheet bar 3 by the leading sheet bar holding portion 12 and the trailing sheet bar holding portion 29. Seat bar 2
It is completely cut and removed from the joint surface between the rear end portion 2a and the front end portion 3a of the succeeding sheet bar 3, and the sliding pressure welding of the preceding sheet bar 2 and the succeeding sheet bar 3 is completed.

In the sliding pressure welding, the trailing seat bar gripping portion 29 is moved up and down by the leading seat bar gripping portion 1.
2 is continued until the distance L between the trailing seat bar gripping portion 29 is reduced by a distance preset by the distance meter 34. This controls the amount of plastic deformation required to extrude outward the oxide film (oxide) covering the joint surface between the rear end portion 2a of the preceding sheet bar 2 and the front end portion 3a of the following sheet bar 3. In addition, the cutters 7a, 22a, 7b, 22b and the stoppers 8a, 23 can be used at the time of friction.
It prevents the a, 8b, and 23b from contacting each other and being damaged.

FIG. 7 shows another embodiment of the cutters 7a and 7b. The cutters 7a and 7b can be moved toward and away from the cutters 22a and 22b by cylinders 7c and 7d. Therefore, when the sliding pressure welding of the rear end portion 2a of the preceding seat bar 2 and the front end portion 3a of the following seat bar 3 is completed, the cutter 7a is pressed against the cutter 22a by the cylinder 7c and at the same time the cylinder 7d is pressed.
Thus, the cutter 7b is pressed against the cutter 22b, and the burrs 35a and 35b can be completely cut and removed from the joint surface between the rear end portion 2a of the preceding sheet bar 2 and the front end portion 3a of the following sheet bar 3.

The present invention is not limited to the above-described embodiment, but the trailing seat bar gripping portion is fixed and the leading seat bar gripping portion is moved vertically (relatively moving in a direction orthogonal to the seat bar). Needless to say, various modifications may be made without departing from the scope of the present invention.

[0027]

As described above, according to the sliding pressure welding method of the seat bar of the present invention, the following excellent effects can be obtained.

(I) The joining surface of the leading seat bar and the trailing seat bar is slidingly pressed until the distance between the leading seat bar gripping portion and the trailing seat bar gripping portion is reduced by a distance set in advance by a distance meter. Since this is done, the amount of plastic deformation of the joint surface between the preceding sheet bar and the following sheet bar can be set arbitrarily.

(II) Since the burrs protruding to the outside of the joining surface of the preceding sheet bar and the following sheet bar are cut and removed by a cutter, a sufficient amount of plastic deformation can be given and complete joining can be performed. You can

(III) Since the burrs protruding to the outside of the joining surface of the preceding sheet bar and the succeeding sheet bar can be cut and removed by the cutter, the sheet bar and the rolling roll are not damaged during the subsequent continuous rolling process. There is no problem such as attaching.

[Brief description of drawings]

FIG. 1 is a detailed side view showing an embodiment of the present invention.

FIG. 2 is a side view of a hot rolling line to which the present invention has been applied.

FIG. 3 is an enlarged detailed view of a portion III in FIG.

FIG. 4 is a side view showing the different operation of FIG. 3;

5 is a side view showing another different operation of FIG. 3. FIG.

FIG. 6 is a side view showing another different operation of FIG. 3;

FIG. 7 is a side view showing another embodiment of the cutter provided at the grip portion of the preceding seat bar.

[Explanation of symbols]

 2a Trailing end portion of the leading sheet bar 2 2 Leading sheet bar 3a Leading end portion of the trailing sheet bar 3 3 Trailing sheet bar 7a Cutter 7b Cutter 12 Leading sheet bar gripping portion 22a Cutter 22b Cutter 29 Trailing sheet bar gripping portion 34 Distance 35a flash 35b flash

Front page continuation (72) Inventor Yoshiaki Tanaami 1 Shinshinarahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama Second Factory (72) Inventor Hisashi Honjo Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa No. 1 Ishi Kawashima Harima Heavy Industries Ltd. Yokohama Second Factory

Claims (1)

[Claims] 1. A front seat bar gripping portion provided with cutters for clamping the rear end of the front seat bar from above and below and projecting to the rear side on both sides in the thickness direction of the front seat bar, and to drive it backward. A trailing seat bar grip portion is provided which clamps the sheet bar from above and below with the leading end of the seat bar facing the trailing end of the preceding seat bar and has another cutter at a position facing the cutter of the preceding seat bar grip portion. Further, a distance meter for measuring the distance between the preceding seat bar gripping portion and the following seat bar gripping portion is arranged on one gripping portion, and the distance between the preceding seat bar gripping portion and the following sheet bar gripping portion is approached. By applying pressure and relative movement in a direction orthogonal to the seat bar, the oxide of the sheet bar joining surface is pushed out as a flash and the outside of the preceding sheet bar gripping portion and the following seat bar are pushed out. Sliding pressure welding is performed until the towbar grip portion comes close to a predetermined distance, and burrs generated at the joining portion between the preceding seat bar and the succeeding sheet bar by the sliding pressure welding are cut by the approach of the cutter. A sliding pressure welding method for a sheet bar, which is characterized by removing.