JPH05185111A - Device for cutting rolled stock - Google Patents

Abstract

PURPOSE:To make both welding end faces into the same right and left symmetrical shapes and surely and easily execute welding of both rolled members by cutting both welding parts respectively with knives which are mounted to different drums when the rear end part of a preceding rolled stock and the tip part of the following rolled stock are welded. CONSTITUTION:When the rear end part of the preceding material 41 of hot rolled stock and the tip part of the following material 42 are welded, the rear end part of the preceding material 41 is cut with the knives 15 which are mounted to the drums 13A while returning it in the inverse direction after rightward passing between a pair of the rotary drums 13A and again rightward moved. Next the following material 42 is cut with knives 15B which are mounted to a pair of the other rotary drums 13B in the similar way. In such a case, by inverting the rotational directions of both drums 13A, 13B and also reversing the directions of the knives 15A, 15B, the cut face 41a in the rear end part of the preceding material 41 and the cut face 42a in the tip part of the following material are made into the same right and left symmetrical shapes, adhesion between both cut faces 41a, 42a is made tight and welding of both end faces 41a, 42a is made sure and easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting the ends of the preceding rolled material when welding the trailing end of the preceding rolled material and the leading end of the following rolled material in a hot rolling line. ..

[0002]

2. Description of the Related Art FIG. 6 shows a conventional example of this type of device.
This is a type called a drum shear, in which a pair of upper and lower rotatable drums 3 and 3 are held by a drum chuck 2 provided in a housing 1, and these drums 3 and 3 are synchronized with the transfer of a rolled material 4. The rolled material 4 is cut by a pair of knives 5 and 5 attached to each drum 3 while the rolled material 4 is passed between the drums 3 while rotating. is there. In the case of the illustrated example, since the rolled material 4 is cut while being transferred in the rolling direction (right side), the upper drum 3 is rotated counterclockwise and the lower drum 3 is rotated clockwise. Is becoming Reference numeral 6 is a reduction mechanism for moving the drums 3, 3 up and down in order to adjust the distance between the drums 3, 3 according to the plate thickness of the rolled material 4. For example, a wedge or a reduction screw is adopted. Has been done.

[0003]

By the way, the shape of the cut surface by the above apparatus is the shape of the knives 5, 5 and the rolled material 4.
7 and FIG. 8 when the cutting is performed under the same conditions. The shape of the cutting surface is usually asymmetrical on both sides of the cutting position as shown in FIG. FIG. 7 shows a state in which the rear end portion of the preceding rolled material 41 is cut. In this case, the new rear end surface 41a formed by cutting becomes a convex curved surface, but the front end surface of the scrap 40 to be discarded. 40a is a relatively flat surface. FIG. 8 shows a state in which the tip of the trailing rolled material 42 is cut. In this case, the new tip surface 42a formed by cutting is a relatively flat surface, but is discarded. The rear end surface 43a of the scrap 43 has a convex curved surface. The arrows in FIGS. 7 and 8 indicate the direction of transport of the rolled materials 41 and 42 and the direction of rotation of the knives 5 and 5.

Therefore, in the case of the above conventional apparatus, the trailing end surface 4 of the preceding rolled material 41 cut as shown in FIG. 7 is used.
1a and trailing rolled material 42 cut as shown in FIG.
When they were butted to be welded to the tip end surface 42a, an irregular gap was left between them, as shown in FIG. Then, it is not always easy to weld the rolled materials 41 and 42 to each other in such a state, and there is some difficulty in the reliability of welding, and an effective improvement measure has been demanded.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in order to connect a preceding rolled material and a trailing rolled material, a trailing end portion of the preceding rolled material and a leading end portion of the trailing rolled material are cut into a shape that can be welded to each other. And a pair of upper and lower drums provided with a knife for cutting the trailing end of the preceding rolled material, and a pair of upper and lower drums provided with a knife for cutting the leading end of the trailing rolled material. And the drums of the pair of drums are arranged side by side along the transfer direction of the rolled material, and the rotating directions of the drums of each pair are opposite to each other, and the directions of the knives attached to the drums of each pair are opposite to each other. It is characterized by that.

[0006]

In the apparatus of the present invention, the trailing end portion of the preceding rolled material and the leading end portion of the trailing rolled material are cut by the knives of the drums of different pairs, and at that time, the rolled material is conveyed in the direction and By setting the rotation directions to be opposite to each other, the shape of cutting for each end of each rolled material becomes the same, and the cut surface becomes symmetrical.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show a state in which the trailing end portion of the preceding rolled material 41 is cut by the device according to the embodiment, and FIGS. 3 and 4 show the leading end portion of the trailing rolled material 42 cut by the device. FIG. 5 shows a state in which a new rear end surface 41a of the preceding rolled material 41 and a new front end surface 42a of the trailing rolled material 42, which are respectively formed by cutting, are butted against each other.

The apparatus of this embodiment has a structure in which two pairs of drums are arranged side by side along the transport direction of the rolled material 4. That is, in FIGS. 1 and 3, reference numeral 11 is a housing, 12A is a pair of upstream drums 13A, 13A.
Is a drum chuck for rotatably holding the drum, and 12B is a drum chuck for rotatably holding the pair of drums 13B, 13B on the downstream side. Each drum 13A, 13A, 1
3B and 13B have knives 15A, 15A and 15 respectively.
B and 15B are attached, and a pair of upstream knives 1
5A and 15A and the pair of knives 15B and 15B on the downstream side have opposite directions. That is, the knives 15B and 15B attached to the pair of drums 13B and 13B on the downstream side have the same orientation as the conventional one shown in FIG. 6, but are attached to the pair of drums 13A and 13A on the upstream side. The orientations of the knives 15A, 15A being opened are opposite to those. In addition, the pair of upstream drums 13A,
The direction of rotation of 13A and the pair of downstream drums 15B, 1
The directions of rotation of 5B are set to be opposite to each other. Note that the spacing between the drums can be adjusted by the reduction mechanisms 16 and 16 according to the plate thickness of the rolled material 4 as in the conventional case.

A procedure for cutting the end portion of the rolled material 4 by the apparatus having the above structure will be described. First, in order to cut the trailing end of the preceding rolled material 41, the trailing end of the preceding rolled material 41 is passed between the drums 13A and 13A and then returned in the opposite direction (left side in the drawing) while the drums are being returned. The cutting is performed with the knives 15A and 15A of 13A and 13A. In this case, the rotation direction of the upper drum 15A is clockwise, and the rotation direction of the lower drum 15A is counterclockwise.

When the cutting is performed in this way, as shown in FIG. 2, the new trailing end surface 41a of the preceding rolled material 41 becomes a relatively flat surface, and the leading end surface 40a of the chip 40 becomes a convex curved surface. This is the same as the procedure for cutting the trailing end portion of the preceding rolled material 41 by the conventional apparatus shown in FIG. 6 (see FIG. 7) (however, the transport direction of the preceding rolled material 41 is opposite to that in the conventional case). is there).

The preceding rolled material 41 whose rear end has been cut as described above is again transported forward and passed through this apparatus, and then the leading end of the following rolled material 42 is cut. To this end, as shown in FIGS. 3 and 4, the trailing rolled material 42 is transferred forward in the rolling direction while the pair of drums 13 on the downstream side is transferred.
B, 13B knife 15B, 15B. The procedure at this time is no different from the procedure for cutting the tip portion of the trailing rolled material 42 by the conventional device (see FIG. 8), and a new tip surface of the trailing rolled material 42 thus formed is obtained. 42a is a relatively flat surface.

In the procedure described above, the transport direction and the drum rotation direction are opposite when cutting the trailing end of the preceding rolled material 41 and when cutting the leading end of the trailing rolled material 42. As is clear from FIGS. 2 and 4, the left and right sides of the trailing end portion of the preceding rolled material 41 and the leading end portion of the trailing rolled material 42 are reversed, and cutting is performed under exactly the same conditions. As a result, the trailing end surface 41a of the newly formed preceding rolled material 41 and the leading end surface 42a of the trailing rolled material 42 are formed.
And will be symmetrical.

Therefore, as shown in FIG.
When two new front end surfaces 42a are abutted against the new rear end surface 41a of the preceding rolled material 41, the end surfaces are left-right symmetrical, so that vertical gaps are formed vertically. Therefore, the welding of the portion can be performed easily and surely, and as a result, not only the workability can be improved but also the reliability of the welding can be improved and the quality can be improved.

In the above embodiment, two pairs of drums 13 are used.
Although A, 13A, 13B, and 13B are installed in the common housing 11, each pair of drums may be installed in different housings, and the housings may be arranged side by side along the rolling line. Further, the device according to the present invention can be applied not only to a stationary type, but also to a cutting work while traveling in synchronization with the transfer of rolled material, that is, a cutting work between runs. Is.

[0015]

As described in detail above, the apparatus of the present invention comprises two pairs of drums in which the direction of rotation and the direction of the knife are opposite to each other. Since the end part and the leading end part of the trailing rolled material are separately cut, it is possible to cut the end part of each rolled material under the same conditions. The end faces can be symmetrical with each other, and as a result, the end faces can be welded easily and reliably.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a state in which a cutting device according to an embodiment of the present invention cuts a rear end portion of a preceding rolled material.

FIG. 2 is an enlarged view of a main part in the same state.

FIG. 3 is a schematic configuration diagram showing a state in which the apparatus cuts a leading end portion of a trailing rolled material.

FIG. 4 is an enlarged view of a main part in the same state.

FIG. 5 is a diagram showing a state in which the preceding rolled material and the trailing rolled material cut by the device are butted to each other for welding.

FIG. 6 is a schematic configuration diagram of a conventional cutting device.

FIG. 7 is an enlarged view showing a state in which the rear end portion of the preceding rolled material is cut by the same device.

FIG. 8 is an enlarged view showing a state in which the leading end portion of the trailing rolled material is cut by the same device.

FIG. 9 is a view showing a state in which a preceding rolled material and a following rolled material cut by the same device are butted against each other.

[Explanation of symbols]

 13A, 13B Drum 15A, 15B Knife 41 Leading rolled material 42 Trailing rolled material

Claims (1)

[Claims] 1. A device for cutting a trailing end portion of a preceding rolled material and a leading end portion of a trailing rolled material into a shape in which they can be welded to each other so as to connect the preceding rolled material and the trailing rolled material. A pair of upper and lower drums provided with a knife for cutting the rear end of the rolled material and a pair of upper and lower drums provided with a knife for cutting the leading end of the trailing rolled material transfer the rolled material. Rolls provided side by side along the direction, wherein the rotating directions of the pair of drums are opposite to each other, and the directions of the knives attached to the pair of drums are opposite to each other. Material cutting device.