JPH0692038B2 - Metal strip joining device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal strip joining apparatus for double-cutting a trailing end portion of a leading strip and a leading end portion of a trailing strip, and butt-welding both end faces thereof, In particular, it is related to improvement that prevents the cut from curling up after cutting.

[Conventional technology]

FIG. 3 is a principal part explanatory view showing, in the order of operation, a conventional strip joining apparatus for metal such as a steel sheet disclosed in Japanese Patent Laid-Open No. 58-34715. First, in FIG. 3 (a), reference numeral 1 is an inlet side clamp, which clamps the trailing strip 6. Reference numeral 2 is an exit side clamp, which clamps the leading strip 5. Reference numeral 3 denotes an upper blade having blade portions 3a fixed to both sides, which is raised. Reference numeral 4 denotes an upper blade having blade portions 4a fixed to both sides thereof, which is lifted and is brought into contact with the lower surfaces of the end portions of both strips 5 and 6, respectively.

Subsequently, as shown in FIG. 3 (b), the upper blade 3 is lowered to simultaneously cut the ends of both strips 5 and 6.

Then, as shown in FIG. 3 (c), the upper blade 3 is raised and the lower blade 4 is lowered, and the double-cut shears body (see FIG. 4) with the upper blade 3 and the lower blade 4 mounted is in the retracted position. Retreat to.

Next, as shown in FIG. 3 (d), the entrance side clamp 1 is advanced to bring the end face of the strip 5 into contact with the end face of the strip 5,
For example, in the case of laser beam welding, the laser torch (working head) 7 of the laser beam is moved closer to and moved along the butt line, and both strips 5 and 6 are welded and joined.

As a conventional strip joining apparatus incorporating the above-mentioned clamp means, double cut shear, and laser beam means, there is, for example, the one shown in Japanese Patent Publication No. 59-50435. This is shown in a front view in FIG. 4 and a side view of the shear clamp portion in FIG. In FIG. 4, 9 is a frame on which the welded portion A and the sheared portion B are mounted, 10 is a cylinder attached to the frame 9 for raising and lowering the upper blade 3, 11 is a cylinder attached to the frame 9 for raising and lowering the lower blade 4, 13 Is a laser source,
A laser is oscillated and a laser beam is emitted from the laser torch 7. 14 is a laser torch 7 for stripping both of the above
It is a feeding means that runs in the direction of the 5 and 6 butt line, and is driven by the motor 15. Reference numeral 16 is a backing plate for the butt welded portions of the strips 5 and 6, which is moved up and down by a cylinder 17 attached to the frame 9. The frame 9 is movably supported on a base 19 and is moved forward and backward in the width direction of the strips 5 and 6 by a cylinder 18.

Next, in FIG. 5, the moving base 22 of the lower half of the entrance side clamp 1 is fixed on the arm 20.
Is moved forward and backward on the base 19. The upper clamp beam 21 of the upper half of the clamp 1 is moved up and down by the cylinder 23. The base 25 of the lower half of the delivery side clamp 2 is fixed on the base 19, and the upper clamp beam 24 is moved up and down by the cylinder 26.

In the above conventional apparatus, the leading strip 5 is clamped by the outlet side clamp 2 and the trailing strip 6 is clamped by the inlet side clamp 1. Lower blade 4 is lifted and stripped
Receive the tip of 5, 6 from below. Then, the upper blade 3 is lowered to cut the respective tip ends of the strips 5 and 6. The lower blade 4 is lowered and the upper blade is raised. Then, as the moving base 20 advances, the trailing strip 6 is advanced via the clamp 1, and the end surfaces of both strips 5 and 6 are brought into abutment with each other.

Then, the base 9 is retracted, and the abutting portions of the strips 5 and 6 reach the backing plate 16. Laser torch 7 for feeding means 14
Thus, feed welding is performed along the abutting portions of both strips 5 and 6.

In this way, when cutting both strips 5 and 6 at the end and performing butt welding, the quality of the welded joint depends on the welding conditions such as laser beam output and welding speed, as well as the butt state of both strips 5 and 6. It depends a lot.

[Problems to be Solved by the Invention]

In the conventional metal strip joining apparatus as described above, after the ends of both strips 5 and 6 are cut with a double cut shear,
Since the upper blade 3 rises, there is a problem that the cutting surface is rubbed up by the blade portion 3a and a part thereof is bent upward, resulting in defective welding. In addition, after cutting, the upper blade 3 is lifted, the frame 9 is moved backward, and the welding process is started. Therefore, there is a problem that it takes much time.

The present invention has been made to solve such a problem, and after cutting the end portions of both strips, scraping the cut surface with an upper blade is eliminated, the butt state is improved, and welding quality is improved. In addition, it is an object of the present invention to obtain a metal strip joining apparatus that shortens the time required for cutting and then proceeding to the welding process.

[Means for Solving the Problems]

The metal strip joining apparatus according to the present invention is provided with a recess on the cutting side surface of the blade portion of the upper blade of the double-cut shear, lowers the upper blade and cuts the end portion of the strip, and then the double-cut shear with the upper blade kept descending. The frame is retracted by retreating.

[Action]

In the present invention, when the upper blade of the double-cut shear is lowered to cut the strip, a gap is formed between the upper blade of the cutting end surface of the strip and the blade of the upper blade due to the thinness of the blade.
As a result, the table cutter can be retracted by retreating the frame in the width direction of the strip while the upper blade is in this lowered state. By this retraction of the frame, the backing plate of the welded portion is moved below the abutting ends of both strips, and welding can be started.

〔Example〕

FIG. 1 is a side view of a double cut shear portion showing an embodiment of a metal strip joining apparatus according to the present invention, showing a state immediately after cutting. The leading strip 5 is clamped by the output side clamp 2, and the rear strip 6 is clamped by the inlet side clamp 1. Blade part 3b on both sides of the upper blade 3
Has a hollow 3c on the cutting side. Blade portions 4a on both sides are fixed to the lower blade 4 and correspond to the blade portions 3b.

The components of the device of the present invention are the same as those of the conventional device shown in FIGS. 4 and 5 except for the blade portion 3b of FIG. 1, and the illustration thereof is omitted.

In the device of the above-mentioned one embodiment, as shown in FIG.
Immediately after cutting the ends of strips 5 and 6 by descending
The recess 3c creates a gap between the blade portion 3b and the end surfaces of the strips 5 and 6 so that they are not in contact with each other.

In this state, the frame 9 of FIG. 4 is moved backward in the direction of the cutting line, the upper blade 3 is not required to be raised, and the double cut shears are retracted without scraping the end faces of the strips 5 and 6. It At this time, the end faces of the strips 5 and 6 are butted at the same time. When the frame 9 is retracted, the welded portion A in FIG. 4 reaches the abutting portion of the strips 5 and 6, and the welding is immediately started by the laser torch 7.

In this way, after the strips 5 and 6 are cut, the welding process can be started without raising the upper blade 3, and the required time can be shortened.

FIG. 2 is a side view of a double cut shear portion showing another embodiment of the present invention. The blade portion 3d of the upper blade 3 is fixed so as to be inclined upward inward and has a clearance angle α to form a dullness.

〔The invention's effect〕

As described above, according to the present invention, the double cut shear upper blade is provided with a recess on the side surface on the cutting side, and after cutting the ends of both strips, the frame is retracted without raising the upper blade. The double cut shears have been retracted by means of which it is possible to shift to the welding process.Therefore, the abutting surfaces of both strips are not rubbed up by the upper blade, a good condition is maintained and welding quality is improved. The transition time to the process is shortened and productivity is increased.

[Brief description of drawings]

FIG. 1 is a side view of a double cut shear portion showing an embodiment of a metal strip joining apparatus according to the present invention, FIG. 2 is a side view of a double cut shear portion showing another embodiment of the present invention, and FIG. FIG. 4 is an explanatory view of a main part showing a conventional metal strip joining apparatus in the order of operation, FIG. 4 is a front view of the conventional metal strip joining apparatus, and FIG. 5 is a side view of the double cut shear portion of FIG. 3 …… Upper blade of double cut shear, 3b …… Blade part, 3c ……
Nusumi, 3d ... Blade, 4 ... Lower blade of double cut shear, 4a ... Blade, 5 ... Leading strip, 6 ... Trailing strip, 7 ... Laser torch A considerable part is shown.

Claims (1)

[Claims] 1. The rear end of the leading strip and the leading end of the trailing strip are cut by a double cut shear, and the trailing strip is moved forward to bring the cut surfaces of both strips into contact with each other, and along the butt groove. In a joining device for welding by means of welding means, a hollow is provided on the outer side of a pair of blades on both sides of the upper blade of the double-cut shear, and the upper blade is lowered to move the trailing end of the preceding strip and the trailing strip. After cutting the tip part, with the upper blade lowered, the double cut shear part is retracted in the extension direction of the cutting line, the cutting surfaces of both strips are butted, and the welding process can be performed. Characteristic metal strip joining device.