JPS5847588A - Laser seam welder - Google Patents

Abstract

PURPOSE:To elevate reliability of seam welding without exerting bad influence on a metallic structure of a substance to be welded, by providing a reflection body on a rocking member provided on the upper position of an upper chip for pressing the substance to be welded, and reflecting a laser light downward. CONSTITUTION:On a receiving base part 8b of a lower chip 8 of a welder, a substance to be weled 9 is placed. A rocking lever 5 is turned counterclockwise, and the substance to be welded 15 is pressed and fixed by an upper chip 5. Subsequently, a reflection body 25 installd to a rocking member 24 is rock-operated slowly by simultaneously driving a driving motor 21 and a laser device. In this case, the laser light is reflected downward by the reflection body 25, and executes seam welding of constant bead length to a weld zone 9a through a condensing lens 26. In this case, even if there is a slight difference in thickness of the substance to be welded 9, the lower chip 8 moves round the supporting axis, and smoothly presses the substance to be welded 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for linearly and uniformly welding a polymerized workpiece using a laser beam from a laser device (laser generator IT>) such as a carbon dioxide gas sheath. l?-
) length seam welding 111m1*II
Regarding K. - In general, electric spot welding means instantaneously supplies a large current to two superposed objects to be welded while applying pressure with an upper Tm pair of electrode tips.
Nowadays, spot welding is becoming more and more common, by generating resistance heat in the workpiece and bringing the joints into contact. .

However, if there are limitations on the plate thickness of the manually welded object by conventional electric spot welding, or if one welding point (spot welding point) is very close to <K, and another spot welding is to be performed, This spot) welding current is diverted to the spot welding part that has already been welded, making it an effective spot! I couldn't get a good connection, so I decided to spot weld! There is a risk that reliability may be impaired.

In particular, with the spot welding means described above, it is difficult to perform straight, continuous beat-length seam welding of two overlapping objects to be welded.

On the other hand, the above-mentioned summer pot welding method requires a large current to flow instantaneously. Therefore, a highly flexible conductor must be used, which not only poses problems in terms of safety and the lifespan of the electrode tip, but also requires that the two objects to be welded be brought into close contact with each other in advance. In addition, when the object to be welded is a thin plate, molten metal mist etc. often scatters in all directions during welding, which may substantially reduce the number of welding points at the joint. .

Furthermore, both electrode tips used in the above-mentioned spot welding means must be kept constantly cleaned in order to maintain their electrical conductivity, cooling properties, and suppression resistance.

On the other hand, several laser spot welding methods have already been proposed and proposed, but when the object to be welded is a thin plate, these methods irradiate the object with a laser beam from an oblique direction to weld and shorten the weld length. The length is adjusted to substantially lengthen the length.

However, due to the above-mentioned laser spot welding method and laser beam welding, blowholes and impurities are often mixed into the metal structure between the welded part and the welded part due to excessive electric heating and rapid cooling. Furthermore, there is a risk that an excessive difference in hardness will occur, causing quenching of the metal, local material strain 4 and cracks in the metal structure.

In order to eliminate the above-mentioned drawbacks, the present invention is to provide an oscillating stack rod equipped with a laser device to the upper part of a machine frame having a horizontal arm lever, and to connect the oscillating stack rod and the above-mentioned machine frame. Cylinder installation! A lower tip is provided at the end of the horizontal arm rod, and an upper tip that presses the workpiece to be welded is vertically placed directly above the lower tip (located on the swing stack rod). A rotating shaft integral with the swinging member □ material is rotatably mounted on the swinging stack above the upper chip, and the laser beam of the device is attached to the swinging member to move the strip body onto the swinging member. The laser beam is attached to the swinging member below the reflector so as to focus the light on the object to be welded. □ Perform seam welding with a constant beat length on the workpiece in a straight line so as not to cause heating and rapid cooling. The present invention provides a laser beam welding machine whose purpose is to improve the reliability of the laser beam welding machine.

Hereinafter, the present invention will be explained based on an illustrated embodiment.1 In Figures 1 to 3, reference numeral 1 indicates a machine frame installed on a board 2, and the machine frame IK is a horizontal arm, a flat arm A rod 3 is provided substantially integrally with the upper IK1aK of the machine frame 1, and an oscillating stack S equipped with a laser device 4 is pivotably mounted on a support shaft 6KL. Also, one side portion 1b of the machine frame 1
A cylinder device 7, such as a hydraulic cylinder device, is connected between the swinging stacking rods 5 and ', and the cylinder device 7 supports the swinging stacking rods 5 on a support shaft 6. Ktt is set so that it can move around Kll.

Furthermore, a lower tip 8 is provided at one end 3a of the horizontal arm rod 3.
It is possible to place and weld the overlapping objects 9 of different plate thicknesses on the support shaft 10. That is, one end 3 of the horizontal arm rod 3 forms a pair of circular arcs 113b, and the lower surface 8m of the lower tip 8 is pivoted by the support 1Ok so that it can sit on the circular arc @ sb tcyii. At the same time, the lower chip 8 is held horizontally by the elasticity of a spring 11 interposed between the lower surface 8a of the lower chip 8 and the one end 3m. Further, in the lower chip 8, there are provided a water supply port 13 equipped with a cooling fluid jet nozzle U, such as a cooling water J, and a cooling fluid discharge port 14, and a cooling fluid discharge port 14 is provided. The pressure fluid U cools the pedestal part 8b of the upper construction side chip 8 from the inside, and furthermore, this pedestal part 8b:Ik
The cooled fluid pigeon is adapted to be discharged from the outlet 14 mentioned above.

On the other hand, an upper tip 15 having a shape of 5 for pressing the workpiece 9 is connected to a mounting member 16 such as a mounting bolt and hanging down to the swinging stack 5 located directly above the 1-inch tip 8. The upper chip ball is provided with an inert gas supply port 17 and an exhaust port. Therefore, during welding, the inert gas flowing in from the air supply port 17 prevents oxidation of the welded portion 9a of the workpiece 9, and also focuses light on metal struts and spatter generated during welding, which will be described later. It is designed to prevent it from sticking to the lens base or reflector.

On the other hand, the free end 5aK of the swinging stack 5 above the upper chuck 15 is provided with a bracket having a bearing 19, and this platen 20 is provided with a drive motor 21 that rotates reversibly. It is powered. Moreover, this drive motor 21
A horse-shaped gear wheel is meshed with a pinion 22- mounted on the o' output shaft, and this layered gear is provided with a rotating shaft usK integral with the WE swinging member arm mounted on the bearing 111. ing. 2. Further, the swinging member 24- is provided with a reflector 25 such as a reflector, which is obliquely provided to reflect the laser beam of the sheathing device 4 downward. A condensing lens is attached to the swinging member U below the section so as to focus on the object to be welded 9.The laser beam from the laser device 4 is thus When the reflector 25 of the moving member oscillates,
Seam welding with a constant beat length can be performed on the workpiece 9.

Therefore, when two objects 9 to be welded are to be superimposed and welded, the objects 9 to be welded are placed on the pedestal portion 8b of the lower tip 8, and the injection nozzle ν of the water supply port 13 is Cooling fluid is injected into the pedestal $8b to cool it. On the other hand,
An inert gas is injected from the key distribution air port 17 to exhaust metal struts and sputters generated during welding from the exhaust gas, thereby creating an atmosphere that prevents oxidation of the welded portion 9b.

Next, by driving the cylinder device 7,
The swinging stacking rod 5 is rotated to the left around the support shaft 6, and the upper tip rib integrated with the swinging stacking rod 5 presses and fixes the workpiece 9 to be welded.

Furthermore, by driving the drive motor 21 and the laser device 4 simultaneously, the pinion 21 of the drive motor 21 is reciprocated, so that the fan-shaped pinion meshing therewith also reciprocates. . Therefore, the reflector portion of the oscillating member, which is substantially integral with the layered gear, slowly vibrates. At this time, the laser beam from the laser device 4 is reflected downward by the reflector, and the condenser lens 2
A seam of a constant beat length is applied to the welded part 9a of the workpiece 9 through the seam! Connect with Minato.

Note that even if the workpiece 9 has a slight difference in wall thickness,
Since the lower tip 8 can be moved around the support shaft 10, it is now possible to smoothly perform press cutting and turning of the shim weld. In addition, the layered gear mentioned above is seam welded in one piece for forward motion only.

Of course it is possible.

Next 1. The embodiment shown in FIG. 4 is another embodiment of the present invention, which is characterized by the position of the free end of the swinging stack 5, the drive monitor 21, and the swinging member integrated with the reflector. Abbreviation SOO
The structure and operation are the same as those of the above-mentioned embodiments.

As described above, according to the present invention 17iK, the swinging pile rod sv equipped with the laser device 4 is pivotally mounted to the upper part of the machine frame 1 having the horizontal arm rod 3, and the swinging pile rod sv equipped with the laser device 4 is connected to the upper machine frame 1 and the above-mentioned swinging pile rod. 5 are connected by a cylinder device 7, a lower tip 8 is provided at the end 311 of the horizontal arm rod 3, and the swinging stack rod 5 located directly above the lower tip 8 - the object to be welded 9 is pressed. In general, the upper chip ball is made to rotate integrally with the swinging member U on the swinging stack 5 above the tip 15, and the axis ua is rotatable! A reflector section is provided diagonally on the swinging part U so as to reflect the Y-day light of the laser device 4 downward, and the light is focused on the swinging member U below the reflector. Since the optical lens is attached to the device 5 to focus on the object to be welded 9', a beam of constant beam length 1141 is attached to the straight line °i.
Not only can this be done smoothly without adversely affecting the metal part of the workpiece 9, but it is also easy to handle and operate, and it also provides a preheating effect [because welding is performed, blowholes and impurities are not mixed in]. can be prevented.

Incidentally, it is free to change the design so that a seven-concave mirror is used instead of the reflector part and condensing lens iris of the above-described embodiment.

[Brief explanation of the drawing]

, FIG. 1 is a front view of a laser seam welding machine based on the VC of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the main parts of the present invention.
Figure 3 is an enlarged cross-sectional view taken along the chain line A-AK in Figure 2;
The figure shows another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Machine frame, 3... Horizontal arm rod, 4... Laser device, -5... Oscillating stack rod, 7... Cylinder device, 8
. . . Lower chip, 9 . . . Object to be welded, n . Kiyoshi Inomata, a substitute employee

Claims (1)

[Claims] 1. A laser device is provided on the upper part of a machine frame having a horizontal arm rod, a swing stacking rod is pivotally mounted, a lower chip is provided at the end of the horizontal arm rod, and a lower chip is provided at the end of the horizontal arm rod, and An upper chip designed to suppress the workpiece to be welded is installed vertically on the oscillating stack located directly above the tip, and a rotating member integrated with the oscillating member is installed on the oscillating stack above the upper tip. A driving wheel is rotatably mounted on a shaft, and a reflector is mounted on this swinging member, and a 15K beam is installed diagonally to reflect the laser beam of the laser device downward, and the laser beam is focused on the swinging member below this reflector. A sheath-sea welding machine characterized in that an optical lens is attached to focus the object on the workpiece.
2. The laser seam welding machine according to claim 1, characterized in that a sector gear that reciprocates is mounted on the rotation axis of the swinging member. & A patent characterized in that the lower chip is provided with a cooling fluid supply/exhaust port, and the upper chip is provided with an inert gas supply/exhaust port. Laser seam welding machine. 4. Item 1, item 2, or item 3, characterized in that the lower tip is pivotally attached to the free end of the horizontal arm rod so that it can swing and move freely on a support shaft.
Laser seam welding machine described in section. “