JPS60115388A - Laser beam welding device for joining steel plates - Google Patents

Abstract

PURPOSE:To join steel plates after correcting a camber error by measuring the central position of the steel plates from the cutting signal in the stage of laser beam cutting then making the centerline of the other steel plate to coincide with the centerline of one steel plate. CONSTITUTION:Working heads 7, 8 on an outlet side and inlet side are started from a reference position S and the distances l1, l2 from the start of cutting steel plates 3, 6 and the distances L1, L2 up to the end of cutting are measured with rotary encoders 13, 15 on the basis of the cutting signal such as light from detectors 10, 11. A operator 22 operates the difference delta0 in the distances from the centerline S of the plates 3, 6 and inputs the output e0 thereof to an amplifier 23. The amplifier 23 controls a motor 20 by the differential output (e0-e) from the output (e) of a rotary encoder 21 so as to attain delta0=0, thereby making the centerline of the plate 6 to coincide with the centerline of the preceding plate 3. The plates 3, 6 are welded by a head 7 after cutting and the joining of the steel plates with good quality is accomplished by the above-mentioned method.

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. Figure 1 shows that the device is equipped with a leading steel plate 3 and a trailing steel plate 6.
is shown inserted, and these steel plates are provided with side guides /, & for aligning the steel plates on the exit and entry sides of the exit clamp j and the entry clamp j, respectively.
As shown in Figure 1, move the side guides/4' symmetrically with respect to the line center C.
The centers of the leading steel plate 3 and the trailing steel plate B were made to coincide with the line center C. A indicates a cutting line, and cutting is performed by placing an exit processing head and an entry processing head on this line as shown in FIG.

FIG. 9 shows the side guide/(c), in which the tuning binion 23 is engaged with the racks 2Q and 2k provided on the left and right plates, and the left side is moved by the air cylinder 2-.

Move the right plate symmetrically.

In Figures S and 6, the entry side clamp 3 moves from the state shown in Figure 1 towards the exit side clamp, butts the joint surfaces, cuts, and
This shows the state immediately before welding is performed using a dual-purpose welding processing head.

However, in the conventional device as described above, as shown in FIG.
As shown in FIG. 5, the leading steel plate 3 and the trailing steel plate A4C
Due to bending, or camber, simply moving the steel plate to the line center using the side guides /, ++ will cause the center lines of the leading and trailing steel plates 3.6 to not coincide with each other at the joint, resulting in , 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, the center lines of the leading steel plate and the trailing steel plate are (3) almost automatically aligned 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. Provided is 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 and aligning the center line of one steel plate with the center line of the other steel plate at a joint.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described and explained with reference to FIGS. 7 to 9. In Figure 7, the exit side and input side machining head?
, t 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 detector 10°// is equipped with a sensor suitable for detecting a cutting signal such as light, sound, or an image of the steel plate generated when the steel plate is cut. A DC motor drives the rod screws /A and /7 that move the machining head and t.
Rotary encoders 1311 for ko and /ri respectively! Connect it.

On the other hand, a cross adjustment device 9 is provided which clamps the trailing steel plate 6 and displaces the trailing steel plate 6 in a direction perpendicular to the line.
A rotary encoder is connected to a DC motor 2/ that drives a bar screw 1g that is screwed into a cross-adjusting device 9Vc.

Arithmetic unit connected to the output of rotary encoder /3, /A-, output of 2.2 is rotary encoder,
The output of 2/ is inputted to the amplifier, 23, and the amplifier 3
The output is configured to control the DC motor and IO.

Next, I will clarify the operation.

First, the exit side and input side processing heads 7. Starting from the reference position (origin position) 8, detect the respective distances 1/, I-2, and distances Lt' and La to the start of cutting of the leading and trailing steel plates 3.6 and the distances Lt' and La to the end of cutting, respectively. Vessel 10. ///
Based on the cutting signal output from 6. /7 rotation amount by rotary encoder /3. /Measure at .

Here, the center of the preceding steel plate 3 is moved from the reference position S to the plate 3. In order to align the center lines of A, the trailing steel plate 6 may be displaced in a direction perpendicular to the line using the cross adjustment device 9 so that δ0 = 0. The arithmetic unit 22 calculates equation (1), adds the output eo to the amplifier 23, controls the DC motor 20 with the difference output (eo-e) from the output e from the rotary encoder 2/, and calculates δ0. = Q.

That is, the center line of the trailing steel plate B is made to coincide with the center line of the preceding steel plate 3.

The figures 3 and 3 show the leading and trailing steel plates 3 with pressure as described above.
．． 6 is cut and aligned using the cross-adjusting device TE, so that the center lines of both steel plates coincide at the joint.

〔Effect of the invention〕

As described above, the present invention utilizes cutting signals such as light, sound, and photography generated when steel plates are cut by a laser beam to correct errors caused by camber between both steel plates to be welded. Therefore, it is possible to achieve a high quality steel plate connection.

[Brief explanation of the drawing]

Figures 1 to 6 show a conventional device. Figure 1 is a schematic plan view of the main part, Figure λ and Figure 3 are a schematic plan view of the main part with the steel plate centered and its side view, and Figure 9 is a schematic plan view of the main part. A schematic front view of the side guide, FIG. S, and FIG. 6 are a schematic plan view of the main part immediately before welding, and a schematic side view thereof. 7 to 9 show one embodiment of the present invention, FIG. 7 is a schematic plan view of the main part and a wiring diagram, and FIGS. g and D are a schematic plan view of the main part and a schematic side view thereof for explaining the operation. It is. /...Exit side guide, K...Output side clamp, 3...
Leading steel plate, L...Entering side guide, 5...Entering clamp, 6...Tracking steel plate, Ri...Outlet processing head, ZA...Entering side processing head, De...Cross adjustment device , 10. //...Detector, l/41...DC motor, /3, /&...Rotary encoder, /A
, /? , 7g...rod screw, /9...nut, -〇...DC motor, rotary encoder, 2.2
...Arithmetic unit, 3...Amplifier. In each figure, the same reference numerals indicate the same or corresponding parts. Attorney: So Ga Do Teru (Za) Procedural Amendment “Sponsored” Mr. Commissioner of the Japan Patent Office 1, Indication of the case Showa Str. Patent Application No. 97 No. 2, Name of the invention Laser beam welding device for joining steel plates 3, Amendment Relationship with the case of a person who does
(601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent address 4th floor 5, Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo, subject of amendment (detailed description of the invention in the specification 11) Column 6, Contents of amendment (1) Correct page q, line 2 [Side guide/(fil) of the specification to be “side guide waste”. (2) Correct page 6, line S, “motor/” to “motor/”. 20”. (3) Correct “error” in line 7 of page g of the same page to “error”.

Claims (1)

[Scope of Claims] (1) A welding device in which the joint ends of a pair of steel plates are cut by a laser beam by a pair of processing heads, and the cut ends are abutted against each other to perform laser beam welding, wherein the processing head Seven pairs of detectors are attached to the respective ones and detect the cutting signals generated when cutting the steel plates, and the output of these detectors detects the cutting start point and cutting end point of each of the l pairs of steel plates from the reference position. A laser beam welding apparatus for connecting steel plates, comprising a matching means for aligning the centers of the steel plates with the centers of the respective steel plates. (2) The beam welding device for connecting steel plates according to claim 1, wherein the cutting signal is light generated during cutting. (4) The laser beam welding device for connecting steel plates according to claim 7, wherein the cutting signal is a sound generated during cutting. The laser beam welding device for connecting steel plates according to claim 1. (lI) The laser beam welding device for connecting steel plates according to claim 1, which is equipped with a processing head for both cutting and welding. ((1) The measuring means is The laser beam welding device for connecting steel materials according to claim 1, which is a twin rotary encoder that measures the rotation amount of two rod screws for feeding the processing head. (6) The matching means connects one steel plate. 2. A laser beam welding device for joining steel plates according to claim 1, which is a cross adjustment device that is clamped and displaced in a direction perpendicular to a welding line based on the measured value of the measuring means.