JPH0562035B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to joining of rolled materials in the field of hot rolling, in which the trailing end of a preceding rolled material and the leading end of a trailing rolled material are joined to make them continuous. Regarding the method.

[Prior art] As a method for joining rolled materials in hot rolling,
A method is known in which the rear end of a preceding rolled material and the leading end of a trailing rolled material are pressed against each other and joined together.

[Problems to be Solved by the Invention] However, in this case, oxidized scale is likely to occur on the surface of the rolled material and the scale is interposed between the joints, so there is a problem that it is difficult to obtain the required joint strength. There is.

An object of the present invention is to provide a method for joining rolled materials that can prevent scale from intervening between joints during hot rolling and can achieve strong joints.

[Means for Solving the Problems] The joining method of the present invention overlaps the rear end of the preceding rolled material and the leading end of the trailing rolled material, and connects the overlapping portion to the top and bottom along the width direction of the rolled material. These shear blades shear both rolled materials together by a stroke within the thickness of the thinner of both rolled materials, and then shear the strokes in the opposite direction by the same amount. By repeating shearing in both directions, a force is applied to the rolled material in a direction perpendicular to the sheared surfaces so that the sheared surfaces of both rolled materials slide against each other, and the sheared surfaces of both rolled materials are pressed against each other. It is characterized by causing it to act.

[Function] In the joining method of the present invention, when the shearing blade is moved by a stroke within the thickness of the thinner of both rolled materials, both rolled materials are sheared by an amount corresponding to the stroke, but are not separated. . Moreover, a new surface is generated on the sheared surface. In this case, since both rolled materials are overlapped and sheared, some of the new surfaces of each rolled material face each other, and as soon as they are formed, they come into contact without coming into contact with air. Therefore, no scale is present between the new surfaces. Next, by repeating shearing in both directions, such as shearing both rolled materials in opposite directions, and then changing the direction and shearing again, the area of the new surface of both rolled materials expands, and
These newly formed surfaces slide against each other, or the rolled material is bent near the newly formed surfaces, and the frictional heat increases the temperature and turns it into a molten state. Therefore, when both rolled materials are pressed in a direction perpendicular to the newly formed surfaces, the newly formed surfaces in a molten state are pressed together, and a strong joint is achieved.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, numeral 1 is a preceding rolled material, and numeral 2 is a subsequent rolling material, both of which are on the hot rolling line.

In this joining method, first, as shown in FIG. 1, the ends of both rolled materials 1 and 2 to be joined are overlapped, and the overlapped portion is positioned between the upper and lower shear blades 3 and 4. These shearing blades 3 and 4 are linear blades having a length greater than the width of both the rolled materials 1 and 2, and are arranged along the width direction of the rolled materials 1 and 2, respectively.
In FIG. 1, numerals 5 and 6 are shearing cylinders for driving both shearing blades 3 and 4, and numerals 7 and 8 indicate a state in which the rolled materials 1 and 2 are sandwiched between each shearing blade 3 and 4. It is a backup member that supports the These backup members 7 and 8 are integrally fixed to the corresponding shear blades 3 and 4 with the rolled materials 1 and 2 sandwiched therebetween. The shearing blades 3, 4 and backup members 7, 8 are each supported by intermediate frames 9, 10 so as to be slidable in the vertical direction, and these intermediate frames 9, 10 are supported by guides 11 to support the rolled materials 1, 2. It is supported slidably in the length direction. Also, the third
Reference numerals 12 and 13 in the figure are pressing mechanisms for sandwiching the rolled materials 1 and 2 before and after the shearing blades 3 and 4 and applying pressing force to the sheared surfaces, and for inserting the rolled materials 1 and 2. A pair of clamp members 16 are provided within the housing 14 and are driven by a clamp cylinder 15.
is supported, and its housing 14 is connected to the rolled materials 1 and 2.
This configuration is provided with a pressing cylinder 17 that presses in the length direction.

First, both the rolled materials 1 and 2 are sheared by applying force as indicated by arrows A and B in FIG. 2 by the shearing blades 3 and 4 by a stroke that does not completely separate them. That is, only the stroke within the thickness of the thinner plate is sheared.

Figure 2 shows the state after the first shearing operation, and the sheared surfaces of both rolled materials 1 and 2 have new surfaces 1a and 2.
a is generated, and these new surfaces 1a and 2a come into contact with each other without being exposed to air. Thereafter, forces are applied as shown by arrows C and D in FIG. 3, contrary to the shearing operation described above, to shear both rolled materials 1 and 2 in the opposite direction to the same extent as the stroke. Then, by repeating shearing in both directions, such as changing the direction and shearing again, the areas of newly formed surfaces 1a and 2a that have occurred in both rolled materials 1 and 2 expand, and these newly formed surfaces 1a and 2a slide against each other. or new face 1
The rolled materials 1 and 2 are bent near a and 2a, and new surfaces 1a and 2 are formed due to the heat of their contact friction and internal friction.
The temperature near 2a becomes high and becomes a molten state.

Therefore, the shear blades 3 and 4 and the backup member 7,
While maintaining the sandwiched state by 8, each rolled material 1,
2 is gripped by the clamp members 16 of the pressing mechanisms 12 and 13, and the housing 14 and the rolled materials 1 and 2 are gripped by the clamp members 16 of the pressing mechanisms 12 and 13, respectively, and the newly formed surfaces 1a and 2 are held together by the pressing cylinder 17 as shown by the white arrows in FIG. When pressed in the direction perpendicular to 2a, since these rolled materials 1 and 2 are held between the shear blades 3 and 4 and the back-up members 7 and 8, the pressing force acting on each rolled material individually is applied to both rolled materials. The pressure is also transmitted to other rolled materials at the overlapped portion of sheets 1 and 2, and as a result, the two rolled materials 1 and 2 are pressed together, and this pressing force guides the intermediate frames 9 and 10. 11
While moving along the arrows E and F in FIG. 3, the newly formed surfaces 1a and 2a in a molten state are pressed against each other to achieve a strong bond. In this case, since both new surfaces 1a and 2a are bonded without being exposed to air, no scale is present between them, and a strong bond can be achieved.

Thereafter, continuous rolling can be carried out by inserting these rolled materials 1 and 2 as they are into a rolling mill.

In order to confirm the basic principle of the present invention, a plate thickness of 19 mm was used.
Two rolled steel plates are heated to a high temperature of 900℃ to 1000℃, a shearing force is applied to each side with a stroke amount of 3mm, and the sliding surface is repeatedly slid at 22Hz for about 15 seconds, and the sliding surface is heated to 3.7Kg/ After applying a compressive force of ^mm2 to 5Kg/ ^mm2 , the joint strength was measured.
It was 16Kg/mm ² to 26Kg/mm ² . Since the tensile strength of the base material is approximately 40 kg/mm ² , it is strong enough to join rolled materials and run them.

[Effects of the Invention] As explained above, according to the present invention, since both rolled materials are stacked and sheared by a stroke within the thickness of the thinner one, a new surface can be generated on the sheared surface without being separated. Moreover, these new surfaces can be brought into contact with each other without being exposed to air. By repeating shearing in both directions, the area of the newly formed surface expands and the vicinity of both newly formed surfaces becomes molten due to frictional heat.Furthermore, both rolled materials are pressed in a direction perpendicular to the newly formed surface, and the newly formed surface in the molten state is Since they are pressed against each other, a strong bond can be achieved.

[Brief explanation of drawings]

1 to 3 are side views sequentially showing the steps of an embodiment of the present invention. 1... Leading rolled material, 2... Following rolling material, 3...
Upper shearing blade, 4... Lower shearing blade, 5, 6... Shearing cylinder, 7, 8... Backup member, 9, 10
...Intermediate frame, 11...Guide, 12, 13
... Pressing mechanism, 14 ... Housing, 15 ... Clamp cylinder, 16 ... Clamp member, 17
...pressing cylinder.

Claims (1)

[Claims] 1 The rear end of the leading rolled material and the leading end of the trailing rolled material are overlapped, and the overlapped part is positioned between the upper and lower shear blades along the width direction of the rolled material, and these shear blades are used to perform both rolling. Both rolled materials are sheared together by a stroke within the thickness of the thinner of the materials, and then sheared in the opposite direction to the same extent as the stroke, and by repeating this shearing in both directions, the sheared surfaces of both rolled materials are A method for joining rolled materials in hot rolling, characterized by applying force to the rolled materials in a direction perpendicular to the sheared surfaces so that the sheared surfaces of both rolled materials are brought into pressure contact with each other. .