JPH04224007A - Method and apparatus for joining hot rolled stock - Google Patents

Abstract

PURPOSE:To join a preceding hot rolled stock and a succeeding continuous rolled stock in a short time to execute hot continuous rolling. CONSTITUTION:The rear end of the preceding hot rolled stock 1 and the front end of the succeeding hot rolled stock 2 are brought into contact with each other. A truck 6 capable of going sidewise along a contact line 3 is mounted on a frame 5. The frame 5 can travel in the moving direction of the hot rolled stock. A cutting torch 7 and a welding torch 8 are set to the truck 6. Immediately after a groove 14 is formed along a contact line 3, the groove is welded and joined by the welding torch 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method and apparatus for joining hot rolled materials for joining the rear end of a preceding rolled material and the leading end of a subsequent rolled material before finish rolling for continuous hot rolling. It is related to.

0002

[Prior Art] Conventionally, when hot rolling a rolled material, a certain length of rolled material was intermittently supplied to a rolling mill one by one for rolling. As in the case of cold rolling, continuous rolling has come to be performed in order to improve the yield and rolling efficiency by reducing the number of defective parts at the leading and trailing ends.

In such continuous hot rolling, before the rolled material rolled in the rough rolling mill is sent to the finishing mill for continuous hot finishing rolling, the trailing end of the preceding rolled material and the trailing rolled material are separated. The rear end of the leading rolled material and the trailing end of the trailing rolled material are connected between the rough rolling mill and the finishing rolling mill for continuous rolling in a finishing mill. Various joining methods have been proposed for joining the tip.

[0004] Already proposed methods for joining hot-rolled materials include: (1) forming dovetail-shaped notches and dovetail-like protrusions at the rear end of the preceding rolled material and the leading end of the trailing rolled material; , are formed by punching so as to have alternating shapes in the width direction, and the rear end of the preceding rolled material and the leading end of the trailing rolled material are overlapped and fitted, and then the sides of the trailing end and the leading end are A device in which the edge engaging portions are joined by welding (Japanese Unexamined Patent Publication No. 61-23502), ■The rear end of the leading rolled material and the leading end of the trailing rolled material are butted together, and the abutted portion is heated. Welding and joining using multiple welding means at the same time (Japanese Unexamined Patent Application Publication No. 1983-1999)
223657), etc.

[0005]

However, among the above-mentioned conventional joining methods, in method (2), a dovetail-shaped notch and a dovetail-like protrusion are formed at the end of the rolled material by punching before finish rolling. Since the plate is thick when forming, the punching work is not easy, and furthermore, since welding is done from the surface of the rolled material, it is difficult to weld deeply in the plate thickness direction.
The butt part of the rolled material is not beveled,
When welding joints at butt portions, there are problems such as it is difficult to weld to a deep part in the plate thickness direction, and the scale narrows in the butt surface and cannot be removed.

[0006] Therefore, in order to eliminate the problems of the conventional welding method described above and to enable easy joining, the present invention has been devised to simply connect the rear end of the preceding rolled material and the leading end of the subsequent rolled material into plates. This is intended to enable welding to the deepest part in the thickness direction.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention brings the rear end of the preceding hot-rolled material into contact with the leading end of the following hot-rolled material, and then: A groove is formed by melting and cutting either one of the hot rolled materials or both hot rolled materials along the contact line of the butt part, and the groove is welded following the groove formation to join. A method and apparatus for joining hot rolled materials. In addition, the cutting, melting, and welding along the above-mentioned contact line should be performed from both left and right sides in the width direction of the plate toward the center to partially weld and join, or the weld line should be longer from either side at the center. The entire length should be welded together.

[0008]

[Operation] When the rear end of the leading hot-rolled material and the leading end of the trailing hot-rolled material are brought into contact and butted together, one or both of the rolled materials is melted and cut from above along the contact line to create a bevel. , the scale on the end faces of both rolled materials at the abutting portion can be removed. Also, since welding is performed subsequent to groove formation,
Welding can be easily performed to the deepest part in the plate thickness direction without scale adhesion. Furthermore, since groove formation and welding are performed simultaneously and in parallel, it is possible to shorten the joining time of hot rolled materials.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1A and 1B show an embodiment of the welding apparatus of the present invention, in which the rear end 1a of the preceding hot rolled material 1 and the leading end 2a of the trailing hot rolled material 2 are connected. A case will be described in which, when the contact lines 3 of both rolled materials 1 and 2 are arcuate, the arcuate extending contact lines 3 are welded together.

Hot rolled materials 1 and 2 are placed on running rails 4 laid on both sides of the hot rolling line where hot rolled materials 1 and 2 run.
A frame 5 is placed so as to straddle the frame 5, and a cart 6 to which a cutting torch 7 and a welding torch 8 are attached is supported on the frame 5 so as to be able to move freely along the contact line 3. After forming the tip, the groove portion is welded with a welding torch 8.

To be more specific, the hot rolled materials 1 and 2 are placed on the running rails 4 which are arranged parallel to each other so as to sandwich the hot rolled materials 1 and 2.
A frame 5 arranged to straddle the frame 5 is supported so as to be freely movable via running wheels 9, and a traversing rail 10 is installed on the inner wall of the frame 5 along the contact line 3 extending in an arc shape. Similarly, a guide rail 11 bent in an arc shape along the contact line 3 is installed on the ceiling of the frame 5, and has a guide roller 12 on the upper surface that rolls along the guide rail 11, and the traverse rail 10. A trolley 6 having a traversing wheel 13 that rolls on the top and a rattling roller 15 that is always biased upward to prevent the traversing wheel 13 from rolling is traversed on the traversing rail 10. The carriage 6 is placed freely on the traverse rail 10 and guided by the guide rollers 12 by a drive device (not shown) such as a motor or cylinder so that it can traverse along the contact line 3. Two of the above-mentioned carts 6 are placed on the traversing rail 10, and a cutting torch 7 and a welding torch 8 are installed on each cart 6 in the width direction of the hot rolled materials 1 and 2 (transverse direction of the cart 6). The hot-rolled materials 1 are lined up at intervals and mounted downward, and are melted and cut with a cutting torch 7 from both sides of the hot-rolled material 1 toward the center in the width direction, and then welded with a welding torch 8.
, 2 is provided with a cutting torch 7 on the inner side in the width direction, and a welding torch 8 is provided on the outer side in the width direction.

The cutting torch 7 is for melting and cutting the abutting portion of the hot rolled materials 1 and 2 to form a groove 14, and the welding torch 7 is for welding the groove 14. The vertical positions of the cutting torch 7 and the welding torch 8 are determined by the traversing rail 10.

When the rear end of the preceding hot-rolled material 1 and the tip of the trailing hot-rolled material 2 are brought into contact and welded together, the moving speed V1 of the preceding hot-rolled material 1 and the trailing hot-rolled material 2 are When the moving speed V2 of material 2 is set to V1 < V2, the state shown in Fig. 2 is changed from the state shown in Fig. 3.
In this state, the leading end of the trailing hot-rolled material 2 is brought into contact with the rear end of the preceding hot-rolled material 1 to butt them together. After the butt, while moving the moving speeds V1 and V2 such that V1 ≦V2, the frame 5 is positioned above the contact line 3 as shown in FIG. 1, and the frame 5 is moved at the same speed on the running rail 4, At the same time, the two carts 6 are moved along the guide rail 11 to traverse the traverse rail 10, and the cutting torch 7 is placed on the contact line 3.
and the welding torch 8 is placed along the line. In this case, hot rolled material 1
, 2 from both sides in the width direction toward the center in the width direction, and first cut the portion along the contact line 3 of the preceding hot rolled material 1 and the following hot rolled material 2 with the cutting torch 7. After simultaneously melting and cutting to form a groove 14, the formed groove 14 is welded with a welding torch 8 to join the abutting surfaces, and the groove is formed with the cutting torch 7 and welded with the welding torch 8. The hot rolled materials 1 and 2 are joined from both sides in the width direction toward the center in the width direction.

In the above, when the hot rolled materials 1 and 2 are joined by partial welding on both sides in the width direction, the method shown in FIG.
, as shown in FIG. 5, two carts 6 are simultaneously moved from both ends of the hot rolled materials 1 and 2 in the width direction toward the center in the width direction, and a portion of the contact line 3 is cut with the preceding cutting torch 7. The groove 14 is formed by cutting while melting. Subsequently, the groove 14 that has just been formed is welded using the welding torch 8. When the cutting torch 7 enters the required distance toward the center in the width direction along the contact line 3, the melting and cutting by the cutting torch 7 is stopped, and the cart 6 is moved horizontally as shown in FIG. 5 to weld the groove 14. Welded with a torch 8, leaving the central part in the width direction butted, and welding the both sides to the welded part 16.
Weld them together as shown below.

On the other hand, when welding the entire length along the contact line 3, as shown in FIG. 6 and FIG. While doing so, the cutting torch 7 that precedes melts and cuts the portion along the contact line 3 to form a groove 14, and at the same time, the groove 14 is welded using the welding torch 8 that follows. When the carts 6 coming from the left and right collide with each other at the center in the width direction, as shown in FIG. After cutting, it is welded with a welding torch 8, and the
The entire length should be welded as shown in the figure.

It should be noted that the above embodiment shows one embodiment of the present invention, and the present invention is not limited to the above embodiment. Although the case where the guide rail 11 is made into a circular arc is shown in FIG. placed and guide rail 1
1 shows the case where the traverse is guided, but the traverse rail 10 may be provided with a guide rail, and the guide rail 11 attached to the ceiling of the frame 5 may be omitted. The trolley 6 may be suspended and supported by the frame 5 in a monorail manner;
Furthermore, in the case where the groove 14 is formed along the contact line 3, the abutment surface portion of the hot rolled materials 1 and 2 is cut with the cutting torch 7. It goes without saying that only one of the row hot-rolled materials 2 may be cut with the cutting torch 7 along the contact line 3, and that various other changes may be made without departing from the gist of the present invention. be.

[0018]

As described above, according to the method and apparatus for joining hot-rolled materials of the present invention, the trailing end of the preceding hot-rolled material and the tip of the trailing hot-rolled material are brought into contact and welded. When joining, a cutting torch and a welding torch are attached to a trolley that is supported so that it can traverse along the contact line, and the cutting torch is advanced from both widthwise ends of the hot rolled material toward the widthwise center. Since a groove is formed by melting and cutting along a tangent line, and then the groove is welded and joined using a welding torch, the following excellent effects can be achieved. (i) Since the contact line is cut, scales on the rear end surface of the preceding hot rolled material and the front end surface of the succeeding hot rolled material can be removed. (ii) Since the groove is welded immediately after cutting the contact line to form the groove, welding can be performed without scale adhesion. (iii) Since groove formation and welding are performed at the same time, the joining time for hot rolled materials can be shortened. (iv) Since a groove is formed and this groove is welded, welding can be easily performed to the deepest part in the plate thickness direction.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the bonding device of the present invention;
A) is a partially cutaway front view, and (B) is a side view.

FIG. 2 is a perspective view showing the state of the preceding hot-rolled material and the subsequent hot-rolled material before they come into contact with each other.

FIG. 3 is a perspective view showing a state in which the preceding hot-rolled material and the subsequent hot-rolled material are in contact with each other.

FIG. 4 is a schematic diagram showing a procedure for partial width welding of a contact line.

FIG. 5 is a schematic diagram showing a state when partial width welding of the contact line is completed.

FIG. 6 is a schematic diagram showing the procedure for full width welding of the contact line.

FIG. 7 is a schematic diagram showing a state when full width welding of the contact line is completed.

[Explanation of symbols]

1 Preliminary hot rolled material 1a Rear end 2 Trailing hot rolled material 2a Tip 3 Contact line 4 Traveling rail 5 Frame 6 Trolley 7 Cutting torch 8 Welding torch 10 Traverse rail 11 Guide rail 14 Bevel 16 Welded part

Claims (2)

[Claims] Claim 1: The rear end of the preceding hot-rolled material and the leading end of the following hot-rolled material are brought into contact with each other, and then heat is applied along the line of contact between the preceding hot-rolled material and the following hot-rolled material. At the same time, melting and cutting one or both of the preceding and following hot rolled materials that are in contact from both ends in the width direction of the hot rolled materials toward the center in the width direction to form a groove, A method for joining hot rolled materials, characterized in that the grooves are welded and joined immediately after the grooves are formed. [Claim 2] A frame arranged so as to straddle the hot-rolled material so as to be able to run in the direction of movement of the hot-rolled material;
A trolley is supported so as to run horizontally along the line of contact between the rear end of the preceding hot-rolled material and the tip of the trailing hot-rolled material, and a cutting torch and a welding torch are attached to the trolley facing downward at predetermined intervals. , the cutting torch and the welding torch are arranged so that when the cart traverses from the widthwise side edge of the hot rolled material in the direction of the widthwise center, the cutting torch leads and the welding torch follows; A joining device for hot rolled materials characterized by: