JPS58103990A - Table for laser working - Google Patents

Abstract

PURPOSE:To provide decreased height of a table, decreased reflected light to the work and improved durability of the table body by coating a laser absorbing material on the surface of a light resistant substrate which is so formed as to take many reflection times of laser beams. CONSTITUTION:V-grooves 12 having a specified angle in such a way that incident laser beams 11 repeat the reflection effective for absorption of energy are provided without any spacing on a substrate 10 made of copper or the like, whereby a table for laser working is formed. Heat resistant paint 13 is coated in the grooves 12 to absorb focused energy effectively. The work is held on the peak parts 14 formed by the grooves 12 and is subjected to cutting, etc. by the focused beams. By such construction the improvement in working characteristic owing to the considerable decrease in reflected energy is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a table on which a workpiece is loaded in a processing apparatus that uses focused energy of a laser beam.

Conventionally, workpiece loading tables in laser processing (hereinafter referred to as "all-processing tables") have not only been used to hold the workpiece, but also to handle the energy of the beam, especially in processing fields that utilize concentrated beam energy, such as cutting and drilling. However, it was necessary to have a durable material and structure.

Hereinafter, an example of a conventional processing table will be explained based on FIG. 1.

This example is a processing table used for cutting metal plates, resin, etc.

A laser beam 1 is focused by a condensing lens 2 and has a focal point 3.
Tie. The positional relationship of the workpiece 4 with the focal point 3 is determined according to its processing purpose. Generally, the focal point 3 is placed on the surface or inside of the workpiece 4 in order to effectively utilize the beam energy.

The processing table consists of a substrate 6 and pins 6, and in order to reduce the influence of reflected light during processing, there are restrictions on the material of the substrate 6 and the material and dimensions of the pins 6. In other words, if the height of the bottle 6 is small, the reflected light from the substrate 6 will be irradiated onto the back surface of the workpiece 4, which will be a fatal flaw in the finish, especially for workpieces that require little energy to process, such as resin. appear.

Therefore, it was necessary to increase the height of the bottle 6 and to make the material of the substrate 6 low in reflectance. However, this means that energy is absorbed into the substrate 6, which is by no means preferable from the viewpoint of durability.

In addition, the pin 6 has a shape similar to a point support because the work 4 is directly loaded on it, and the influence of reflected light on the work 4 is reduced as much as possible. A shape that prevents parts from deforming easily.
It must be the material. This is contrary to the condition that requires a point support structure.

As mentioned above, conventional machining tables had a structure that sacrificed one of the following: height dimension, workpiece finishing accuracy, and durability, that is, flatness retention.The present invention improves the above drawbacks. The purpose of this design is to reduce the table height, reduce the amount of light reflected on the workpiece, and improve the durability of the table body.

The processing table according to the present invention is characterized by adopting a shape and structure that effectively absorbs the energy of the laser beam.

That is, as shown in FIG. 2, consider the case where the laser beam 8 is incident on the cooling block 7 shaped like a cone with an apex angle θ. What is the material of block 7?

A material with high reflectance, high thermal conductivity, and thermal diffusivity for the wavelength of the laser used, such as copper, is selected and used to ensure durability. Heat-resistant paint 5, for example, carbon-based paint 9, is applied to the laser beam irradiation surface in order to increase energy absorption.0 If the reflectance of the laser beam on the irradiation surface is R, then 1
The energy after the second reflection is expressed as pn, where the original energy is Σ.

Assuming that the apex angle θ is 20', as shown in Figure 3, if the laser beam is incident parallel to the central axis of the cone, the number of times it will be reflected until it is emitted to the outside again is This will be the 9th time.

Assuming that the reflectance R = 0.2, the energy of the returning laser beam is 0.2·E or 6,12 Xl
It can be seen that the attenuation becomes o-' and is attenuated to such an extent that it does not pose a problem at all.

In this case, the number of times the beam is reflected is related only to the apex angle θ and has nothing to do with the dimensions, so it is possible to arbitrarily set the depth dimension in the incident direction of the laser beam.

As mentioned above, choose the shape to increase the number of reflections,
In addition, the beam irradiation part has a structure in which the substrate is made of a material with good light resistance and is coated with heat-resistant paint to increase energy absorption.

An embodiment of the present invention will be described below based on FIG. 4.

In FIG. 4, the incident laser beam 11 has a certain angle so that the incident laser beam 11 is repeatedly reflected onto a substrate 1o made of a material such as copper that has high light resistance against the laser used. The V-shaped grooves 12 are provided without gaps. A heat-resistant paint 13 is applied to the V-shaped groove 12 for the purpose of effectively absorbing energy.

By cooling the substrate 1o according to the laser output, wavelength, etc., the durability can be further improved.

Regarding the influence of reflected light on the workpiece, since the workpiece is held at the top 14, there is no problem unless the focused beam and the top 14 coincide. The durability of the top part is more reliable than before due to the use of materials with high light resistance, the use of quality materials, and increased heat capacity. Furthermore, by reducing the pitch of the V-shaped grooves 12, it is possible to reduce the height of the substrate 10.

According to the laser processing table of the present invention having the above configuration, the following effects can be achieved.

(1) Processing properties can be improved by significantly reducing the reflected energy of the laser beam.

(2) The range of use can be expanded by reducing the height of the processing table.

(3) A significant improvement in the durability of the processing table body can be expected.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional processing table with an explanation of laser processing added, Figs. 2 and 3 are illustrations of reflection of a laser beam in the present invention, Figs. 4 (a), (b), (
C) is a plan view, a partially cutaway front view, and a side view of the table for laser processing according to the present invention. 10... Light-resistant substrate, 11... Laser beam, 12... V-shaped groove, 13... Laser absorber (heat-resistant paint), 14... ...Top. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 3 Figure 10' Figure 4 IΔ

Claims (2)

[Claims] (1) A laser processing table formed by coating a laser absorber on the surface of a light-resistant substrate whose surface is shaped into a shape that allows a large number of laser beam reflections. (2) A laser processing table as set forth in claim (1), wherein a copper plate is used as the light-resistant substrate, a V-shaped groove is formed on the surface of the copper plate, and a heat-resistant paint is applied to the surface.