JPS61108487A - Engraving method by laser beam - Google Patents

Abstract

PURPOSE:To engrave at a low cost a pattern formed by a beam transmitting part by forming a beam shielding part and the beam transmitting part by applying a heat resisting paint to a machining surface of a base material, and moving relatively a laser beam to the machining surface. CONSTITUTION:A heat resisting paint is applied to a machining surface 2 of an object 1 to be machined of a glass plate, etc., and a beam shielding part 4 of a painted film part of a character, etc. and a beam transmitting part 4 of other part are formed. This object 1 to be machined is placed on a work base, and a laser beam 5 is moved and irradiated in the X-Y directions. In this case, it is also possible that the laser beam 5 is fixed, and the work base is moved. Subsequently, the heat resisting paint is removed by using a thinner, etc., and the surface is polished. According to this method, the engraving can be executed up to a thin line. Also, although the surface of the beam shielding part 3 is smooth, the surface of the beam transmitting part 4 becomes translucent as a ground glass, and a beautiful finish is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a novel method for engraving workpieces such as wood, glass, synthetic resin, etc. using laser light.

<Prior art> In order to engrave a workpiece, it can be engraved using a cutting tool such as a chisel, engraved by mechanical or physical means such as sandblasting, melted or corroded by chemical means, or melted by laser light. Alternatively, methods such as thermal decomposition have been implemented.

Conventionally, in order to engrave a workpiece using a laser beam, the following methods are used: 1) Move the laser beam or the workpiece in the X-Y axis direction using numerical control to engrave a fixed pattern, or 2) Carve the processed shape. A metal shielding plate made of copper or other material with a transparent part cut out in a pattern corresponding to the pattern is placed closely over the workpiece, and a laser beam is scanned from above in the X-Y direction to irradiate only the transparent part. A method of engraving was known (Special Publication No. 15232/1983).

<Problems to be Solved by the Invention> However, in the above method (■), programming for numerical control is complicated when engraving a complex pattern, and the equipment for numerical control is expensive and impractical. There are many cases. In the method shown in ①, the process of obtaining the metal shielding plate by cutting or etching is complicated, so it may differ from the original drawing, and all the drawn lines must be connected, so the process of cutting or etching the metal shielding plate is complicated. There are some drawbacks, such as restrictions on the number of works available.

<Means for Solving the Problems> The present invention solves the above-mentioned difficulties in engraving using laser light.
2), by applying heat-resistant paint to partially form a light-shielding part (3), or by applying heat-resistant paint to the entire surface of the workpiece and then partially peeling off the heat-resistant paint film to form a light-transmitting part (4). ) and a step of forming a light-shielding part (3) with a residual coating film, and a pattern formed in the light-transmitting part (3) by moving and irradiating the workpiece and laser light relative to each other in the X-Y direction. They developed a new method that consists of the process of carving.

The heat-resistant paint here refers to a paint that can withstand higher temperatures than normal paint or does not melt or decompose when exposed to laser light, and from a compositional standpoint,
Z=h,. It is preferable to use a paint containing powdered metal such as lead, copper, metal, etc. Therefore, it is preferable to use a commercially available silver-based paint or a paint containing gypsum, mica, or carbon in addition to the above metal powder. obtained by doing.

<Operation> According to the method of the present invention, a figure or character is directly drawn on the workpiece, and the workpiece can be processed by sweeping and irradiating the workpiece with a laser beam.

Embodiments will be described in detail below with reference to the drawings.

<Example 1> FIGS. 1 to 3 are perspective views showing the working process of the first example. In this example, the workpiece (1) is 511II.
A thick glass plate was used, and its processed surface (2) was degreased and cleaned using a trichloride solvent spray method, and then air-dried. Separately 60
A heat-resistant paint (manufactured by Nitto Kogyo Co., Ltd., trade name: silver-based Tetsusol M 8600) mixed with mica at a ratio of 8:1 was prepared and was applied to the glass surface twice using a brush. I drew letters like this. The drawn letters indicate that the part coated with heat-resistant paint is the light-shielding part (3) and the other part is the light-transmitting part (4). and output 200
W, laser beam irradiation was performed at a processing speed of 5 m/min. Irradiation is the second
As shown in the figure, the laser beam (5
) was irradiated in the X-Y direction. Note that it is also possible to fix the laser beam and move the work table in the X-Y directions to irradiate the workpiece. As shown in Figure 3, the heat-resistant paint on the workpiece was then removed using thinner, and the surface was further polished with a cloth.

The resulting glass plate engraved with laser light is engraved down to the thinnest lines, and the glass surface in the light-shielding part is smooth, but the glass surface in the light-transmitting part has fine cracks, making it translucent like ground glass. A beautiful finished product was obtained.

<Example 2> FIGS. 4 and 5 are perspective views showing the working process of the second example. In this case, the workpiece (1) is 10I10L.
A scrap board of 1 thickness was used, and its processed surface was degreased and cleaned with a surfactant. After drying, coat the entire surface with highly heat-resistant paint (manufactured by Oshima Kogyo Co., Ltd., trade name: Pyrosin A, $20
00) mixed with aluminum powder and mica in a ratio of 8=1:1 was prepared, and the mixture was sprayed onto the entire surface of the waste board to form a coating film (6).

Next, as shown in FIG. 4, a figure was drawn while peeling off the coating using a cutter (7). In the picture drawn, the remaining heat-resistant paint film becomes the light-shielding part (3), and the peeled part becomes the light-transmitting part (4). Place it on the work table of the gas laser processing machine,
Laser light irradiation was performed at an output of 200 W and a processing speed of 5 m/min. The heat-resistant paint was then removed in warm water, and the surface was further wiped with a cloth to finish.

In the resulting work, only the parts where the paint film was peeled off became carved grooves (8) as shown in Figure 5, resulting in a well-finished carved work.

<Effects of the Invention> Since the laser beam engraving method of the present invention as detailed above allows engraving by simply drawing letters or pictures on the workpiece, it can be applied to signboards, ornaments, interior decorations, etc. wide,
The cost is low, especially when making only a single item, and it is possible to engrave any shape.

[Brief explanation of drawings]

1 to 3 are perspective views showing the working steps of the first embodiment, and FIGS. 4 and 5 are perspective views showing the working steps of the second embodiment. (1) Workpiece (2) Processing surface (3) Light shielding part
(4) Transparent part (5) Laser light (6
) Paint film (7) Cutter (8) Engraving groove or more

Claims (1)

[Claims] 1 Partially form a light-shielding part (3) by applying heat-resistant paint to the processed surface (2) of the workpiece, or apply heat-resistant paint to the entire processed surface of the workpiece and then partially apply a heat-resistant paint film. A process of peeling off to form a light-transmitting part (4) and a light-blocking part (3) with a residual coating film, and moving and irradiating the workpiece with a laser beam relative to the workpiece in the X-Y direction to remove the light-transmitting part. (4) An engraving method using a laser beam, comprising the step of engraving the pattern formed in step (4).