JPS629791A - Method for abutting wide and thin steel strips - Google Patents

Abstract

PURPOSE:To increase an abutting accuracy by making the cut face of the preceding steel sheet coincided with a welding torch traveling line by using an image sensor, then by arranging both cut faces so as to minimize the gap with the succeeding sheet cut face. CONSTITUTION:A preceding sheet 1 is transferred by a roller 10 and the rear end part thereof is cut by a cutting device 6. The cut face of the preceding sheet 1 is made coincident with the traveling line of a welding torch 5 with enlarging observation by using an image sensor by forming clamps 3, 3' in unclamping state. The succeeding sheet 1' is then transferred by a lead-in roller 10 and the cut face thereof is abutted to the cut face of the preceding sheet 1. In this case, the gap between both cut faces is made minimum by using the image sensor and sheets 1, 1' are clamped by the clamps 3, 3' as well. The generation of the deformation and slippage of the sheet is eliminated thus and the butt accuracy is increased.

Description

Detailed Description of the Invention <Object of the Invention> Industrial Field of Application The present invention relates to a method for butting wide and thin steel plate strips, and more specifically, for example, when the thickness of the steel plate is 0.5 to 0.15 rWI.
A. Even if the sheet width is 500 to 1000fflIW (even if it is a thin and wide steel sheet strip, when cutting the opposing ends and butting these cut surfaces together, the steel sheet I.
The present invention relates to a butting method that can form a butt with a minimum gap so as to be suitable for laser welding without deforming the lip or causing misalignment.

BACKGROUND OF THE INVENTION In general, steel strips are made continuous by joining their ends together, and then subjected to a certain treatment. This junction is
Usually, the rear end of the leading steel plate strip (hereinafter referred to as the leading plate) is cut in a so-called sea welder, and the trailing steel plate strip (hereinafter referred to as the trailing plate) is cut.

), the cutting surfaces of the leading plate and the trailing plate are abutted against each other, and welded along the abutment groove. Additionally, this welding is usually TIG welding.
Compared to these welding methods, laser welding generates almost no heat affected zone and can make the weld bead width extremely small. Laser welding is very often used in high-grade steel strips. However, in laser welding, TIG
A bevel precision higher than that required for welding and MIG welding is required, and furthermore, the welding torch travels exactly in line with the butt line between the preceding plates, and at the same time the gap between the cut surfaces is 0. 04 to 0.06 Il.

In other words, when welding the ends of steel plate strips together, it is necessary that the gap between the cut surfaces be extremely small, with a maximum of about 0.04 to 0.0 inches. For welding, the diameter of the laser beam is O.
It can be made as small as -1 to 0.2 degrees φ, and the laser beam itself has excellent straightness. Therefore, the weld bead width can be made extremely small, for example, with a plate thickness of 0.5 to 0.1
Even with ultra-thin materials such as 5mm+, welds can be kept to a minimum, and this is particularly required for high quality silicon steel. Further, as the diameter of the laser beam becomes extremely thin, the allowable value of the gap between the cut surfaces of the leading and trailing plates, that is, the butt gap, becomes extremely small, and a groove that meets this requirement is required. However, even if the ends of the steel plate strip are cut with considerable straightness, it is necessary to butt the cut surfaces together without any difficulty. For example, plate thickness 0
．． When the pressure is about 15 Il, even if the pressing force becomes slightly large, the plate itself may be deformed or mismatched, that is, a difference in level may occur on the abutting surfaces. For this reason, if the laser beam has a small diameter, the laser beam may locally pass through during welding, creating holes, making it impossible to obtain a sound weld.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks, and specifically, for example, a very thin plate with a thickness of 0.15 to 0.5M and a width of 500 to 1500M. Even with wide steel plate strips, the butt line of the cut surface can be precisely aligned with the traveling line of the welding torch, and the steel plate strip itself can be deformed or misaligned due to grooves (in other words, the steel plate strip itself is not misaligned). ] The object of the present invention is to propose a butting method that allows butting with a gap close to zero without causing problems such as lips being butted in a stepped state.

<Structure of the Invention> Means for solving the problem and its operation, that is, the method of the present invention involves cutting both opposite ends of a wide and thin leading steel sheet I-slip and a trailing steel sheet strip, and cutting these cut surfaces. When butting each other, the opposing ends of the preceding steel sheet strip are cut, and the cut surface of this preceding steel sheet strip is transferred to the vicinity of the welding torch travel line, and then the cut surface is enlarged at the welding torch and placed on the image sensor. −
to accurately match the welding torch traveling line, and then clamp the preceding steel plate strip in this state,
Subsequently, the cut surface of the trailing steel strip is brought closer to the cut surface of the leading steel strip in this clamped state, and the gap between the two cut surfaces is enlarged, and the image sensor detects this and determines whether this gap is the minimum. It is characterized in that the cut surface of the trailing steel sheet strip is butted against the cut surface of the preceding steel sheet strip.

Therefore, the structure of this means and its operation will be specifically explained with reference to the drawings as follows.

Note that FIGS. 1, 2, 3, and 4 are explanatory diagrams of each step when carrying out the method of the present invention, and in particular, FIG. 1 shows the cutting of the rear end of the leading plate. Side view showing the surface, 2nd
The figure and FIG. 3 are a plan view and a side view of the step of positioning the cut surfaces of the leading plate, and FIG. 4 is a side view of the step of butting together the cut surfaces of the leading board and the trailing board.

First, as shown in FIG. 1, a leading plate 1 is conveyed by a pair of introduction-side rollers 10, and its rear end is cut by a cutting device 6 at a cutting position. At the welding position adjacent to this cutting position, a leading plate clamp 3 and a trailing plate clamp 3' are provided on the clamp table 2, and these clamps 3.3' are raised and separated from the clamp table 2. The leading plate 1 is moved by a pair of discharge side rollers 11 in an unclamped state.
is conveyed in the direction of the arrow, and as shown in FIG. position. That is, in this position, weld on top]・-chi 5
is arranged so that it can run freely in the width direction of the plate, while a bagper 4 is arranged in the lower part in the width direction of the plate. The machine travels in the direction and is welded.

In this case, the trailing plate 1' has a pair of introduction side rollers 10.
The tip is conveyed to the cutting position by the holder, the tip is cut off, and the tip is left on standby as shown in Fig. 1.

In addition, this cutting device 6 can be configured as a pair of shear cutters, such as a single cutter cutter or a double cutter cutter, as usual, but in the case of a shear cutter, the cutting surface is cut in two stages. or the straightness in the width direction of the plate may be impaired. For this purpose, each cut surface can be cleaned with abrasive grains. moreover,
Instead of a shear cutter, direct cutting can also be performed using a rotary abrasive cutting body that cuts by abrasive cutting, such as a so-called disk cutter.

Next, as shown in FIG. 2, the position of the cutting surface 1a of the preceding plate 1 with respect to the welding line 1 and 1 is magnified and detected by an image sensor 9 disposed above.

That is, this image sensor has an optical magnification function, and detects whether or not the cut surface 1a coincides with the welding line i.--chi. To explain in more detail, the preceding plate clamp 3
A control clamper 8 having an NG control function is disposed adjacent to the control clamper 8, which clamps the leading plate 1, and synchronizes the control clamper 8 with an image sensor 9. Therefore, when the cutting surface 1a is not aligned with the welding torch travel line as detected by the image sensor 9, the control clamper 8
is driven, and the leading plate 1 is moved in the line direction, plate width direction, rotational direction, etc. for fine adjustment, and the cut surface 1a is surely aligned with the welding torch traveling line. In addition, after matching,
The leading plate clamp 3 is lowered and the leading plate 1 is fixed at that position to complete positioning.

Next, the trailing plate 1' is driven by a pair of introduction rollers 10, and the cut surface 1a' of the trailing plate 1' is brought into contact with the cut surface 1a of the leading plate 1. At this time, the pressing force is too great, and as mentioned above, when the plate thickness is thin, there is a risk that the leading plate 1 and the trailing plate 1' may be deformed or misaligned. For this reason, the image sensor 9 is used to magnify and observe the butt state.
When pressing, butt together so that the force is appropriate. When butted together in this way, and in this state, clamp the traveling plate with the trailing plate clamp 3', the gears and tabs between the two cut surfaces 1a and Ia' will be 0.04 Gmm or less, and at most 0.0 Gmm. As a result, even when welding with a small diameter laser beam, welding can be performed satisfactorily without penetration or localized holes.

<Effects of the Invention> As explained in detail above, the present invention cuts both opposing ends of the leading steel sheet strip and the trailing steel sheet strip,
When butting these cut surfaces together, after cutting the opposite ends of the preceding steel sheet strip, the cut surface of this preceding steel sheet strip is transferred to the vicinity of the welding torch travel line, and then, while enlarging this cut surface, The position of the cut surface of the preceding steel sheet strip is detected by an image sensor, and the cutting surface of the following steel sheet strip is butted against the position of the cutting surface of the preceding steel sheet strip, and opened by aligning the welding line 1 to 1 accurately with the running line. It forms the tip.

Therefore, even if the thickness of the plate is reduced to about 0.15a+n+, the cut surfaces can be properly pressed against each other and aligned, so that the plates can be aligned without deformation or misalignment.

From the point of view, even when butt welding 0.15-thick silicon steel plates, the gear can be reduced to 0.04 to 0.06 mm or less, so laser welding can be performed without creating holes or the like. can.

[Brief explanation of the drawing]

1, 2, 3, and 4 are explanatory diagrams of each step in carrying out the method of the present invention, and FIG. 1 is a side view showing a cut surface of the rear end of the leading plate. , FIGS. 2 and 3 are a plan view and a side view of the step of positioning the cut surfaces of the leading plate, and FIG. 4 is a side view of the step of butting the cut surfaces of the leading plate and the trailing plate. Code 1... Leading board 1'... Trailing board 2... Clamp base 3... Leading board clamp 3'... Trailing board Plate clamp 4... Bagper 5... Welding torch 6... Cutting device 8... Control clamper

Claims (1)

[Claims] When cutting opposite ends of a wide and thin leading steel strip and a trailing steel strip, and butting these cut surfaces together, after cutting the opposite ends of the leading steel strip, the cut surface of the leading steel strip is The welding torch is transferred to the vicinity of the welding torch travel line, and then, the cut surface is detected by an image sensor while being enlarged to match the welding torch travel line exactly, and the preceding steel plate strip is clamped in this state, and then Then, the cut surface of the trailing steel strip is brought close to the cut surface of the leading steel strip in the clamped state, and the gap between the two cut surfaces is enlarged, detected by the image sensor, and this gap is minimized. , a method for butting wide and thin steel sheet strips, characterized by butting a cut surface of a trailing steel sheet strip against a cut surface of a leading steel sheet strip.