JPS6261396B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a laser beam welding device for joining steel plates, and in particular to a laser beam welding device for joining steel plates having a function of cutting steel plates with a laser beam. be.

[Prior art]

Generally, when welding and connecting steel plates in a steel process line, it is necessary to align the center lines of the leading and trailing steel plates at the joint.

A conventional device of this type will be explained using FIGS. 1 to 6. Fig. 1 shows a state in which a leading steel plate 3 and a trailing steel plate 6 are inserted into the device, and these steel plates are attached to the exit side and the entry side of the exit side clamp 2 and entry side clamp 5, respectively, for aligning the steel plates. The side guides 1 and 4 are arranged respectively, and the left and right plates of the side guides 1 and 4 are moved symmetrically with respect to the line center C as shown in FIG. was made to coincide with line center C. A indicates a cutting line, and cutting is carried out by placing the output processing head 7 and the input processing head 8 on this line as shown in FIG.

FIG. 4 shows the side guides 1 and 4, in which a tuning pinion 23 is engaged with racks 24 and 25 provided on the left and right plates, and the left and right plates are moved symmetrically by an air cylinder 22.

5 and 6, the entry side clamp 5 moves toward the exit side clamp 2 from the state shown in FIG. 2, the joint surfaces are butted, and welding is performed by the processing head 7 for both cutting and welding. Indicates the previous state.

However, in the case of conventional devices such as those mentioned above,
As shown in FIGS. 2 and 5, due to the fact that the leading steel plate 3 and the trailing steel plate 6 have bends or cambers, simply moving the steel plate to the line center using the side guides 1 and 4 will not work. At the joint, the center lines of the leading and trailing steel plates 3 and 6 do not coincide with each other,
In the end, there was a drawback that a difference δ remained.

[Summary of the invention]

This invention was made with attention to the above points, and by adding a simple means, it is possible to almost automatically align the center lines of the leading steel plate and the trailing steel plate at their joints. The object of the present invention is to provide a laser beam welding device for joining steel plates that can be used to connect steel plates.

To achieve the above object, the present invention utilizes cutting signals such as light, sound, or vibration when cutting a steel plate with a laser beam to position the cutting start point and cutting end point of both steel plates relative to a reference position. To provide a laser beam welding device for joining steel plates, which is equipped with a means for measuring the center position of each steel plate by detecting the , and aligning the center line of one steel plate with the center line of the other steel plate at a joint part. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 7 to 9. In FIG. 7, detectors 10 and 11 are installed on the output and input processing heads 7 and 8, respectively.
is attached at a constant distance from the center of the laser beam and at a constant distance C from the reference position S. The detectors 10 and 11 are equipped with sensors suitable for detecting cutting signals such as light, sound, or vibration of the steel plate generated when the steel plate is cut. Rotary encoders 13 and 15 are connected to DC motors 12 and 14 that drive rod screws 16 and 17 that move the machining heads 7 and 8, respectively.

On the other hand, a cross-adjustment device 9 is provided that clamps the trailing steel plate 6 and displaces the trailing steel plate 6 in a direction perpendicular to the line, and drives a rod screw 18 that is screwed into a nut 19 connected to the cross-adjustment device 9. A rotary encoder 20 is connected to a DC motor 21.

The output of the arithmetic unit 22 connected to the outputs of the rotary encoders 13 and 15 is
1 is input to the amplifier 23 together with the output of the amplifier 2.
The DC motor 20 is configured to be controlled with an output of 3.

Next, the operation will be explained.

First, the exit and entry processing heads 7 and 8 are started from the reference position (origin position) S, and the respective distances l ₁ and l ₂ are measured until the cutting starts of the leading and trailing steel plates 3 and 6.
and the respective distances L ₁ and L ₂ to the end of cutting based on the cutting signal output from the detectors 10 and 11,
Rotary encoders 13 and 15 measure the amount of rotation of rod screws 16 and 17 for feeding the machining head.

Here, the center of the preceding steel plate 3 is l ₁ from the reference position S.
+L ₁ -l ₁ /2, and the center of the trailing steel plate 6 becomes l ₂ +L ₂ -l ₂ /2 from the reference position S. Leading and trailing steel plates 3, 6
_{In order} to _{match the center lines of}
/2)...The trailing steel plate 6 may be displaced in the direction perpendicular to the line so that δ ₀ =0 in (1). The arithmetic unit 22 calculates equation (1), adds the output e ₀ to the amplifier 23, and calculates the difference output (e ₀
-e), the DC motor 20 is controlled so that δ ₀ =0, that is, the center line of the trailing steel plate 6 coincides with the center line of the leading steel plate 3.

Figures 8 and 9 show that the leading and trailing steel plates 3 and 6 have been cut as described above and aligned by the cross-adjust device 9, so that the center lines of both steel plates coincide at the joint. This shows the state in which the

〔Effect of the invention〕

As described above, the present invention uses cutting signals such as light, sound, and vibration generated when steel plates are cut by a laser beam to correct errors caused by camber between the two steel plates to be welded. So,
This has the effect of achieving high quality steel plate connections.

[Brief explanation of the drawing]

Figures 1 to 6 show a conventional device. Figure 1 is a schematic plan view of the main part, Figures 2 and 3 are a schematic plan view of the main part with the steel plate centered and its side view, and Figure 4 is a schematic plan view of the main part with the steel plate centered. A schematic front view of the side guide, FIGS. 5 and 6 are a schematic plan view of the main part immediately before welding, and a schematic side view thereof. 7th
9 to 9 show an embodiment of the present invention, FIG. 7 is a schematic plan view of the main part and a wiring diagram, and FIGS. 8 and 9 are a schematic plan view of the main part and a schematic side view thereof for explaining the operation. . 1... Outlet side guide, 2... Outlet side clamp, 3
... Leading steel plate, 4... Entry side side guide, 5... Entry side clamp, 6... Trailing steel plate, 7... Output side machining head, 8
...Enter side machining head, 9...Cross adjustment device,
10, 11...detector, 12,14...DC motor,
13, 15... rotary encoder, 16, 17,
18... Bar screw, 19... Nut, 20... DC motor, 21... Rotary encoder, 22... Arithmetic unit,
23...Amplifier. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A welding device in which a pair of processing heads cuts the joined ends of a pair of steel plates with a laser beam, and the cut ends are butted against each other to perform laser beam welding. A pair of detectors are attached and detect a cutting signal generated when cutting the steel plates, and the output of the detectors detects the cutting start point and the cutting end point of each of the pair of steel plates from a reference position. It is characterized by comprising a measuring means for measuring the center position of each steel plate, and a matching means for aligning the center of one of the steel plates of the joint with the center of the other steel plate based on the measurement value of the measuring means. Laser beam welding equipment for connecting steel plates. 2. The laser beam welding device for joining steel plates according to claim 1, wherein the cutting signal is light generated during cutting. 2. The laser beam welding device for joining steel plates according to claim 1, wherein the cutting signal is a sound generated during cutting. 3. The laser beam welding device for connecting steel plates according to claim 1, wherein the cutting signal is vibration generated in the steel plate during cutting. 4. A laser beam welding device for connecting steel plates according to claim 1, which is equipped with a processing head for both cutting and welding. 5. The laser beam welding device for joining steel materials according to claim 1, wherein the measuring means is a pair of rotary encoders that measure the rotation amount of a pair of rod screws for feeding the processing head. 6. The laser beam welding device for joining steel plates according to claim 1, wherein the matching means is a cross adjust device that clamps one of the steel plates and is displaced in a direction perpendicular to the welding line based on the measured value of the measuring means.