JPS59101294A - Laser welding device - Google Patents

Abstract

PURPOSE:To perform stable welding by laser light in the stage of irradiating the laser light to objects to be welded along the weld line thereof and welding said objects by attaching an optical position detector and a light shielding plate to a laser torch. CONSTITUTION:In the state of irradiating laser light to objects and welding the weld line 3 of said objects, a carriage 14 moving in an X-axis direction is attached to a cross beam 10 which moves in parallel with the Y-axis direction shown in the figure above objects 2A, 2B to be welded and further a laser torch 17 is attached thereto. An optical position detector for the weld line 3 and a shielding plate 37 for the laser light and plasma light 38 generated in the stage of welding are provided to the top end thereof. The laser light from a generator 23 passes through plural ducts, collimator and bender and enters the laser torch. The plasma light 38 is shielded by the plate 37 in this state and the weld line 3 is detected only by the reflected light thereof. The movement of the carriage 14 in the X- and Y-axis directions is securely controlled in accordance with the detected weld line 3, whereby the movement of the carriage 14 in the X-, Y-axis directions is securely controlled and to irradiate securely the laser light on the weld line and the excellent laser light welding is accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser welding device that performs welding by irradiating a welding line of a workpiece with laser light.

In general, a Rade welding device that uses Rade light focuses the Rade light using a convex lens to increase the energy density of the Rade light and performs welding with a spot beam diameter of a small diameter (for example, φ=1.Of+iI! or less). There is. or,
The Rade welding device requires a straight optical path to guide the Rade light generated from the Rade light generator to the Rade torch provided with an extending tip. Therefore, the structure is such that the RADE welding device is fixed and the object to be welded is moved, or vice versa, the object to be welded is fixed and the welding device is moved. Since the device structure makes it easy to obtain a straight optical path, laser welding devices that are relatively simple and mainly perform linear welding are commonly used.

However, as mentioned above, since the spot beam diameter of the radar light is small, even in simple and ilTl fishing line welding, the welding line of the workpiece is parallel to the moving axis of the radar installed at the tip. It is necessary to set it accurately. As a result, setting work requires a long time,
In addition, even if the welding line is set accurately, the entire length of the welding line of the object to be welded is not always parallel to the axis of movement of the radar torch, and the radar light emitted from the radar torch during welding may deviate from the welding line of the object. This may result in poor welding or deterioration in the quality of the welded part, and furthermore, there is a risk that stable rede welding may not be possible if the work is interrupted and reset during rede welding.

The present invention has been made based on the above points, and its purpose is to detect the welding line of the object to be welded in front of the laser torch in the direction of movement, and to control the position of the laser torch based on the detection signal. Therefore, it is an object of the present invention to provide a welding device capable of performing stable welding over the entire length of a weld line.

That is, the RADE welding apparatus according to the present invention includes a welding object support that supports the welded object, and a welding object support that is provided on the upper surface side of the welded object support and that is orthogonal to each other on a horizontal plane that is parallel to the welded object support. A radar torch provided movably in two directions relative to the workpiece support base; a radar light generator for supplying radar light to this laser torch; An optical position detector detects a weld line on a workpiece by receiving plasma light, and a shielding plate prevents plasma light and laser light from directly entering the optical position detector. This is a fully equipped configuration.

The reflected plasma light is received by an optical position detector installed in front of the laser beam in the direction of travel. At this time, since there is a gap in the weld line, the plasma light is not reflected, and the detector is not sensitive to that part. This allows the welding line of the workpiece to be detected, and the position of the sillage detorch can be controlled based on this detection signal.

In addition, it is possible to perform rede welding accurately along the actual welding line, and to perform stable rede welding over the entire length of the welding line of the object to be welded.

An embodiment of the present invention will be described below with reference to FIGS. i1 to 4. In the figure, a 1/d workpiece support is shown. A pair of welded objects 2, 2B, are placed on this welded object support 1, and 2B and 2B are welded #i! 3 is formed.

A pair of peds 4 sandwiching the support base J for the workpiece to be welded.
and 5 are provided.@On this pair of peds 4 and 5 are provided rails 6 and 7, respectively.

Carts 8 and 9 are slidably provided on the rails 6 and 7, respectively. A cross beam 10 is installed between the pair of carts 8 and 9, and the gate-shaped structure 7-
J'i shadow formation. Rails 12 and 13 are installed above and below one side surface of the cross beam 10. The transverse carriage 14 is slidable along these rails 12 and 131C in a direction perpendicular to the sliding direction of the carriages 8 and 9.
is provided. Jin's rampant cart 14 is beam pender 1
5. It is composed of a radar torch holder 16 and a radar torch 17. On the other hand, the truck 8 has a column 18 and a beam pender 19ft.
9 is an expandable laser beam passage duct 20. Collimator 2
1 and a fixed laser passing duct 22 to a laser generator 23 . And the above beam pender 1
9 is connected to a beam pender Z5&C provided on the upper part of the traversing carriage 14 via an extensible laser beam passing duct 24. In other words, the laser light emitted from the Rede light generator 23 is the Golime cluster 21? IC #) V bundled and lede light passing duct) JO.

Beam pender 19. The laser beam is sent to the laser beam holder 16I/c of the traversing truck 14 via the laser beam passage duct 24 and the beam pender 19. A driving screw 25'f is mounted on the ped 5 through the carriage 9t-.
A drive motor 26 is provided for driving. Further, the truck 9 is provided with a column 21, and a drive motor 28 for driving the transverse truck 14t is housed in the column 27 of the column. and these drive motors 26 and 28
By appropriately driving the relay detorch 17, the Lure detorch 17 is set on the workpiece 2 at an optimal position relative to the welding line 2B.

Next, the configuration below the radar torch 17 will be described with reference to FIG. That is, the laser torch 17 is connected to the adapter 2.
It is connected to the laser torch holder 16 via 9.

A nozzle 30 is provided below the radar torch 17, and the radar light emitted from the radar light generator 23 described above is transmitted to the adapter 29 and the radar torch 1.
From this nozzle 3θ through 7, the two objects to be welded and 2B
A cooling pipe 31 is connected to the laser torch 17, and a cooling pipe 31f is connected to the laser torch 17.

This is a configuration in which the Luray detorch 17 is cooled by a cooling medium supplied through the cooling medium. A gas supply pipe 32 is connected to the nozzle 30 and is configured to supply an inert gas for welding, such as aluminum, into the nozzle 30. The radar torch 17 has a dial 33 for fine adjustment in the vertical direction.
The nozzle 30 is configured to be finely adjustable in the up and down directions, and the nozzle 30 is configured to be finely adjusted in the front, back, left, and right directions by a dial 34 for fine adjustment in the front, back, left, and right directions.

An optical position detector 35 is provided at a position forward in the direction of travel of the radar torch 12.
6 to the nozzle 30. A shielding plate 37 is also provided between the nozzle 30 and the optical position detector 35.
is provided. That is, the optical position detector 35 receives the reflected light from the workpiece 2 of the plasma light 38 generated during welding by the optical position detector 35. At this time, a gap is formed at the welding line 9, and the reflected light is reflected from the workpiece 2. There is no Therefore, the optical position detector 35 is configured to detect the position of the weld line 3 without sensing only that part. Further, the shielding plate 37 has a function of preventing direct incidence of the plasma light 38 and the radar light into the optical position detector 35.

Then, based on the position detection signal detected by the optical position detector 35, the position of the laser torch 17 is controlled to be perpendicular to the direction of welding progress, and the actual welding #i is performed! This is a configuration in which the radar beam is reliably irradiated along line 3 to perform welding.

Based on the above configuration, a description will be given of butt welding of steel plates as an example. First, the objects to be welded are statically welded in advance, or the objects to be welded are set by two people and placed on a 2Bf object support stand 1, as shown in FIG.

The joint portion is defined as a weld line 3. Then, the drive motor 26 is driven to cause the truck 9 to travel. When this trolley 90 travels, the integrated trolley 8 also travels. Then, the axis of the radar torch 17 is positioned and stopped at the welding start position in the Y-axis direction in the figure.

Next, the drive motor 28 is driven to cause the traversing truck 14 to travel. Then, the shaft center of the radar torch 12 is positioned and stopped at the welding point position in the X-axis direction in the figure. Once the position of the radar torch 17 is determined in this manner, the radar light generator 23 is activated. The laser beam emitted from the Rade light generator 23 is sent to the Rade torch holder 16 via the fixed Rade light passage duct 22, the collimator 2, the Rade light passage duct 20, the beam pender 19, the Rade light passage duct 24, and the beam pender 15. Argon is supplied to the inside of the nozzle 30 through the supply pipe 32t and is blown out from the tip of the nozzle 30. This allows welding to be performed while shielding the welding location. Then, the drive motor 26t is driven to move the trolley 8°9f:
Welding is performed along the welding line 3 while traveling in the Y-axis direction.

At this time, the weld line 3 of 2B is not necessarily set parallel to the rail 6 or 7 on the object to be welded 2. Therefore, if the trolley 8.9f is run in the Y-axis direction, the radar light may be irradiated onto a location that should not be welded, thereby impairing the quality of the workpiece. So the lede torch 1
7 Detects the welding line 3 by the optical position detector 35 provided in the front in the direction of movement, and drives the laser torch 17 in the X-axis direction so that the axis always lies on the welding line s based on the amount of deviation from the Y-axis. The motor 28 is fully controlled. This makes it possible to reliably irradiate the radar light along the actual welding line and perform welding.

The above operation f: Explain in detail with reference to Figures 5 and 6! Moon. As mentioned above, since there is a gap in the weld line 30 part, there is no reflected light of plasma light or q&. Therefore, the portion of the optical position detector 35 corresponding to the weld line 3 is not sensitive, and the detector output voltage becomes O. And for example the fifth
As shown in the figure, it is assumed that the detector output is O at a distance X from the end of the detector measurement range t.

This means that the weld line 3 is located at a distance X from the end of the detector measurement range t. Therefore, in order to move the weld line 3 to the center of the detector measurement range t,
By driving the drive motor 28, as shown in FIG.
, ) only run on the traversing platform 'JR, 14. This allows the axis of the radar torch 17 to be positioned on the actual welding line 3. Thereafter, by similarly detecting the position of the welding line S by receiving the reflected light of the optical position detector 35 and the Yoshi plasma light 38, the axial center position of the radar torch 17 can be controlled, and the actual welding can be performed. By reliably irradiating the laser beam onto the weld line 3, it is possible to form a stable weld over the entire length of the weld line 3. Further, it is possible to shorten the time required for setting the workpiece 2B and provide a high-quality welding part protrusion to the workpiece 2. Note that in the above embodiment, the workpiece support 1 side is fixed, and the redet torch 17 Although it is applied when the side is movable, it goes without saying that the same effect can be achieved even when applied in the opposite case.

That is, the laser welding apparatus according to the present invention includes a workpiece support that supports a workpiece, and a workpiece support that is provided on the upper surface side of the workpiece support and that is orthogonal to each other on a horizontal plane that is parallel to the workpiece support. A radar torch provided to be movable relative to the workpiece support in two directions, a radar light generator for supplying radar light to the radar torch, and a radar light generator provided in front of the radar torch in the welding progress direction to emit light during welding. A configuration that includes an optical position detector that detects the welding line of the workpiece by receiving plasma light, and a shielding plate that prevents plasma light and laser light from directly entering the optical position detector. It is.

The reflected plasma light is received by an optical position detector provided in front of the crepe torch in the direction of travel. At this time, since there is a gap in the weld line, the plasma light is not reflected, and the detector is not sensitive to that part. This allows the welding line of the object to be welded to be detected, and the position control of the crepe torch can be performed based on this detection signal. The effects are great, such as being able to perform laser welding accurately along the actual welding line and performing stable laser welding over the entire length of the welding line of the workpiece.◎

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the present invention, Figure 4 is a partially enlarged view of Figure 3, and Figures 5 and 6 are corrected. FIG. 1... Welding object support stand, 2A, 2B... Welding object,
3... Welding line, 17... Rede torch, 23...
Laser light generator, 35...Optical position detection 2, 3
7... Shielding plate. Applicant's sub-agent, patent attorney Takehiko Suzue Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (middle) a workpiece support base that supports a workpiece; and a workpiece support base provided on the upper surface side of the workpiece support base and extending in two directions orthogonal to each other on a horizontal plane parallel to the workpiece support base. a laser torch that is movable relative to the laser torch; a radar light generator that supplies radar light to the laser torch; 1. A radar welding device comprising: an optical position detector that detects a weld line of a workpiece; and a shielding plate that prevents plasma light and laser light from directly entering the optical position detector.