JPS63154285A - Laser beam machine - Google Patents

Abstract

PURPOSE:To stabilize the working quality by providing the device forming a parallel bundle of rays from the beam having a divergent angle on the optical path of a laser beam. CONSTITUTION:The optical path of a laser beam 27 is formed by respectively arranging reflection mirrors 23, 21, 17 between a laser oscillator 25 and the condensing lens 15 of a work head 13. In this case, the meniscus lens 29, etc., obtaining a parallel bundle of rays from the beam having a divergent angle at the position not interfering with the horizontal movement of the reflection mirror 23 between the oscillator 25 and a 1st reflection mirror 23 are arranged. Even if the optical path length of the laser beam 27 is varied every moment with the portal moving base 7 on a table 3 being moved, the device of the meniscus lens 29, etc., forming the parallel bundle of rays is interposed in the optical path, so the working energy intensity of the laser beam 27 does not vary. Consequently, the laser machining quality is stabilized.

Description

[Detailed Description of the Invention] [Objective of the Invention 1 (Industrial Application Field) The present invention relates to a laser processing machine, and more specifically, the present invention relates to a laser processing machine, and more specifically, the present invention relates to a laser processing machine, in which a laser beam is emitted from a laser beam [5] and a condensed light beam provided on a processing head. The present invention relates to a laser processing machine that is provided with a device that obtains a parallel beam bundle from a beam having a divergence angle in an optical path that reaches an optical device.

(Prior Art) Although the Radhe beam emitted from an oscillator has a very small e which cannot be compared with incandescent lightning, it still has a divergence angle and spreads in proportion to the traveling distance.

In conventional laser processing machines, the processing head remained stationary and the workpiece was moved and positioned by numerical control.
! l! Since the distance to the optical lens, condensing concave mirror, etc.) is almost constant, there is no change in processing energy, so this was not a big problem.

In a laser processing machine with a moving processing head, where the distance from the in-furnace oscillator to the condensing optical device changes from moment to moment, the processing energy changes in strength or weakness as the distance traveled by the laser beam changes, resulting in high-quality processing. There was a problem that could not be resolved.

[Means for Solving the Problems] The present invention aims to solve the problems of the above-mentioned conventional devices by starting a beam having a divergence angle at the gate of a laser oscillator and a condensing optical device. The construction cost of the laser 1111, which is equipped with a device that converts parallel light beams by 1!7, was commercialized.

(Function) A laser processing machine embodying the technical idea of the present invention described in detail below has a device between the oscillator and the converging optical device that converts the laser beam having a divergence angle into a bundle of parallel rays. Even if the distance to the condensing optical device changed, the processing energy remained constant.

(Example) An example of the present invention will be described in detail below based on FIG.

The laser processing machine 1 of this embodiment fixes a workpiece W such as a plate material to a table 3 by appropriate means, and
X-axis guide rails 5 installed on both sides (one direction and Y-axis direction)
A gate-shaped movable table 7 is provided which can be guided and moved and positioned by numerical control.

A Y-axis guide rail 9 is provided above the gate-shaped moving table 7, and a moving member 11 is provided on the lower front surface of the moving member 11, which is guided by the Y-axis guide rail 9 and can be moved and positioned freely by numerical control in the Y@force direction. A processing head 13 is provided.

The processing head 13 is provided with a condensing lens 15 which is a condensing optical device inside, and above the condensing lens 15 is a third lens.
A reflecting mirror 17 is attached.

One column part 19 of the gate-shaped moving table 7 has second columns arranged above and below.
An anti-tAM 21 and a first reflecting mirror 23 are attached, and a laser beam 27 emitted from a laser oscillator 25 installed at the left front of the table 3 travels horizontally along the Change the direction vertically upward using the mirror 23.

Next, the laser beam is bent by the second reflecting mirror 21 in a direction along the horizontal Y-axis direction, and converted into a downward vertical laser beam by the third reflecting mirror 17, and reaches the condenser lens 15.

Ideally, the laser beam 27 forms a completely parallel beam up to the condenser lens 15, but conventional laser beams 27 have a divergence angle, and some of the beams deviate from the parallel beam and become laser beams. The light is absorbed by the lens barrel (not shown) between the oscillator 25 and the condenser lens 15.

The laser beam 27 that has passed through the condenser lens 15 is focused near the surface of the workpiece W (not shown) and processes the workpiece W by heating, melting, etc.

The apparatus according to the embodiment of the present invention converts a parallel ray bundle between the laser oscillator 25 and the first reflecting mirror 23 from a beam having a divergence angle that does not interfere with the horizontal movement of the first reflecting mirror 23 (for example, a meniscus). A (crescent-shaped) lens 29 is provided.

The meniscus lens 29 is a convex lens characterized by having a concave surface and a convex surface each having a crescent-shaped cross section on both sides and having little aberration.

[Effects of the Invention] As is clear from the detailed description above, a laser processing machine embodying the technical idea of the present invention has a laser beam emitted from a laser oscillator that has an optical path that reaches a condensing optical device provided in a processing head. A device is provided for obtaining a 1"J ray bundle from a beam having a divergence angle therein.

Therefore, even if the length of the optical path changes from time to time, it is possible to almost eliminate the laser beam with a divergence angle that is wasted, and the applied energy can be reduced to 1! depending on the processing position. This resulted in stable, high-quality machining without any fluctuation in strength.

In addition, in the above explanation, some of the changes in the optical path length in the X-axis and Y-axis directions were discussed, but since the processing head with a built-in condensing optical device may be moved up and down depending on the thickness and material of the workpiece, Of course, this also includes dimensional changes in the axis (in the vertical direction). .

It is also clear that various other design changes can be made without departing from the technical idea of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. (Explanation of symbols representing main parts of drawings) 1... Laser processing machine 13... Processing head 1
5... Condensing lens 25... Laser oscillator 2
9...Meniscus lens

Claims (1)

[Claims] A laser processing machine characterized in that a device for obtaining a parallel beam from a beam having a divergence angle is provided in an optical path in which a laser beam starts from a laser oscillator and reaches a condensing optical device provided in a processing head.