JPS60219Y2 - Structure of laser welding machine stage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser welding machine, and more particularly to an improvement of a stage for butt welding thin metal belts.

In recent years, in office automation electronic equipment, there has been an increase in the use of parts formed by endless belts made of thin sheet metal (0.15 mm or less), such as printing belts for printers and code tapes for photoelectric detection devices.

Since such belts are usually stretched between a pair of rollers and run at high speed, it is necessary to minimize side slippage and fatigue damage during running, and for this purpose, adding belts and butt welding endless connections requires energy saving. Laser welding was performed using a laser welding machine that has a high concentration and can minimize the effects of heat.

First, the structure of the stage of a conventional laser welding machine used for this work and the welding work method performed using the stage will be explained with reference to FIG.

An anvil a with its bottom surface exposed above a plane coordinate table 1 arranged perpendicular to the laser optical axis z-z' of the welding machine
The finished end faces of the thin plate belt b passed through the gap at the bottom are butted together on the anvil, and the vicinity of each end face is held open with a presser plate d with the upper part of the butt line C open. The laser head 2 is finely adjusted in the optical axis direction and the plane coordinate table is positioned so that the laser beam is fixed at an arbitrary point C' on the abutment line, and then the plane coordinate table is fixed. A predetermined laser welding is performed while the laser welding is caused to travel along the butt line C.

However, in order to cool and prevent oxidation of the welding area and to prevent molten debris from adhering to the lens, the conventional device has a distal end of the laser light source 2 along the optical axis toward the surface of the welding point C'. Nozzle e1 and anvil a that spout active gas
A nozzle f is attached for supplying inert gas to the back surface of the weld line C by penetrating the anvil from the back surface of the anvil.

Since these inert gas supply means are for local oxidation prevention and cooling, it is difficult to reduce the gas flow rate to an extremely low level, resulting in wasted inert gas consumption, and piping is attached to the anvil side. It is difficult to set the belt, and if the pressure of inert gas spraying is high, the belt joint may become misaligned in the thickness direction, resulting in poor welding.
There were some drawbacks.

The present invention was developed with the aim of correcting the above-mentioned drawbacks, and is a mounting system for a laser welding machine consisting of a plane coordinate table disposed perpendicular to the laser optical axis and a mounting jig mounted on the table. This is an improvement to the table, and the mounting jig includes a means for holding a pair of thin metal belts with their ends abutted in parallel with the table and for flowing an inert gas along the abutment line on both sides of the belts. The jig is characterized in that a portion of the jig on the laser light source side facing the abutting line is made of a transparent member.

Next, a preferred embodiment of the stage according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a vertical side view of one embodiment of the stage of the present invention, and FIG. 3 is a horizontal side view of the same, both showing cross sections at the positions of the arrows.

In the figure, 1 is a plane coordinate table, 2 is a laser light source,
Reference numeral 3 denotes a mounting jig in which a clamp member 8 consisting of a plate 5, a holding plate 6, and a transparent plate 7 is superimposed on the substrate 4.

In the present invention, the plane coordinate table of the components of the stage is the same as the conventional one, but the attachment of the belt disposed on the table and the inert gas supply mechanism are constructed as a jig with good workability. This is different from the conventional method.

In other words, in this installation, the jig is placed on the reference surface 4 that should come into contact with the chiffle 1.
A substrate 4 has a concave bottom surface 42 parallel to the concave bottom surface 42 and one concave side surface 43 is formed at right angles to the concave bottom surface 42, and a lamp surface parallel to the reference surface 51 that is to be in contact with the concave bottom surface 43. 52
A pressing plate 6 having a flat surface 61 on which the clamping surface 52 is to be pressed is fixed to the mounting plate 5 having a shape with a mounting screw 62, and one end surface is simultaneously attached to the reference side surfaces 53 and 63 perpendicular to the reference surface 51. A reference side surface 43 is placed on the substrate 4 placed at an arbitrary position on the table 1.
53 and 63 are placed in a pair, and the clamp member 8 can be freely removed by pressing the side surface and the bottom surface with a push screw 44 screwed in from the outside of the other side surface. There is.

In addition, for mounting, a shallow groove 56 is formed in the center of the lower surface 51 of the plate 5 in a direction parallel to the reference side surface 53 to allow the belt b to be inserted. As shown in FIG. 3, a predetermined number of grooves 54 and 64, which correspond exactly to the width of the sandwiched belt b and extend a predetermined amount to the side opposite to the reference side surfaces 53 and 63, are arranged opposite to each other. It is formed along the butt line of belt b.

Thus, from the grooves 54 and 64, the reference side surfaces 53 and 6
3, and holes 45 and 45' in the side wall of the substrate connected to the openings of the pores.
Pipes 46 and 46' are connected to the pipes 46 and 46'.

Further, the groove 64 is formed on the side of the holding plate 6 facing the laser light source 2.
A seat is made until a transparent member 7 is visible, and a transparent member 7 through which laser light can pass is glued to the seat.

When laser welding is performed using a stage having such a configuration, the end face of the thin metal belt to be laser welded is accurately butted against the groove 54 of the mounting plate 5 on a working surface plate (not shown), and the end face of the thin metal belt to be laser welded is Clamp member 8 that is fixed and clamps the belt
is mounted on a substrate using the method described above and laser welding is performed.

According to the stage of the present invention, the clamping work can be performed by removing the clamping member from the stage, and by preparing a plurality of clamping members, it is possible to improve the workability and reliability of the clamping work and to improve the welding work. Efficiency can be improved.

Inert gas such as argon is supplied to the pipe 46, hole 45, pore 65, groove 64, groove 54, pore 55, hole 45', pipe 46.
', but the grooves 64 and 54
At this point, a reliable welding atmosphere can be created with a small flow of inert gas flowing along both sides of the butt line of the belt.

There is an effect. In laser welding of thin plates, since the irradiation energy to the welding point is relatively small, almost no molten debris is generated, so a means is provided to blow out an inert gas toward the focal point of the laser beam along the optical axis. It is not necessary to clean the transparent member 7 from time to time.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional stage, FIG. 2 is a vertical side view of the stage of the present invention, and FIG. 3 is a lateral side view. In the figure, 1 is a plane coordinate table, 2 is a laser light source,
3 is a mounting jig, 4 is a board, 5 is a mounting plate, 6 is a holding plate,
7 is a transparent member, and 8 is a clamp member.

Claims (1)

[Scope of utility model registration request] In the stage of a laser welding machine, which consists of a planar coordinate table arranged perpendicular to the laser optical axis and a mounting jig mounted on the table, the mounting is performed by moving the jig vertically in two directions. The upper and lower jigs are divided and detachably fixed with respect to the lower jigs, and also hold the end faces of the upper jigs on which laser welding is to be performed, and the parts facing the end faces are made of transparent members. A structure of a stage for a laser welding machine, characterized in that an inert gas flow path is provided in the portion of the stage.