JPH02263590A - Laser beam machine - Google Patents

Abstract

PURPOSE:To prevent hardening at machining position in a material to be machined and the development of strain caused by heat by making shape of beam for heat treatment larger than shape of beam for cutting and irradiating, at the same time or separated time, the material to be machined with two beams. CONSTITUTION:After dividing the beam 2 generated from a laser generator 1 with beam splitters 3 and 4, by condensing the beam 2 through condenser lenses 5 and 6 having different focal distance, the material 7 to be machined is irradiated with the beams for cutting mode 8 and heat treatment mode 9. In this way, the shape of the beam 9 for heat treatment is made larger than the shape of the beam 8 for cutting mode. In the technical means, at the same time, the beam 8 for cutting mode irradiates or before or after this irradiation, the beam 9 for heat treatment irradiates. By this method, the hardening at the machining position in the material 7 to be machined generated at the time of irradiation of the beam 8 for cutting mode and the strained position caused by the heat can be temperature or annealed. In this result, the development of micro-crack at the machining position can be prevented.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a laser processing machine.

Conventional laser processing machines are widely used for cutting and welding metal materials, resin materials, ceramic materials, and the like.

Problems to be Solved by the Invention However, in conventional laser processing machines, when high carbon steel or the like is laser processed, the processed portion becomes hard due to the heat, as if it had been hardened. Further, when ceramic materials and the like are processed by laser, there are problems such as distortion caused by heat and generation of microcracks in the processed area.

SUMMARY OF THE INVENTION An object of the present invention is to provide a laser processing machine that eliminates distortion caused by hardening and heat of a processed part of a workpiece caused by laser irradiation.

Means for Solving the Problems The present invention provides a laser processing machine with a cutting mode beam and a heat treatment mode beam, and simultaneously irradiates the beam of the cutting mode and the heat treatment mode beam onto the same position of the workpiece. It is characterized by

Alternatively, in this technical means, the special effect is characterized in that immediately after irradiating either the cutting mode beam or the heat treatment mode beam, the other beam is irradiated to the same position. By irradiating the heat treatment mode beam at the same time as the beam irradiation, or before and after the beam irradiation, it is possible to harden the processed part of the workpiece and temper the parts that are distorted due to heat when the cutting mode beam is irradiated. , or can be annealed. As a result, conventional problems such as microcracks caused by hardening of the material or distortion due to heat, which occur in the processed area, can be solved.

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. Note that common elements in each figure are given the same numbers.

FIG. 1 shows that by focusing on either the condenser lens 5 or the hoe 6 and shifting the focus on the other, a beam 8 in a cutting mode with a high peak power and a beam 8 in a heat treatment mode with a low peak power can be generated. This method uses the method of creating beam 9.

1 in Fig. 1 is a laser oscillator that oscillates from a laser oscillator 1, splits a beam 2 with beam splitters 3 and 4, and then condenses the beam through condensing lenses 5 and 6 with different focal lengths. The workpiece 7 is irradiated with a beam 8 in a cutting mode and a beam 9 in a heat treatment mode.

In the above embodiment, a lens with a short focal length is used as the condensing lens 5, a lens with a long focal length is used as the condensing lens 6, and the workpiece 7 is attached so as to match the focal point of the condensing lens 3. It is. However, it is also possible to mount the workpiece 7 so that it coincides with the focal point of the condenser lens 4.

Furthermore, if the mounting distance from the workpiece to the condenser lens is changed, the same effect can be obtained by using condenser lenses with the same focal length.

Furthermore, in the above embodiment, for the workpiece 7,
Although the irradiation position of the beam passing through each condenser lens is different, the irradiation position of the beam can be arbitrarily set by providing a structure that allows the optical axis of the beam passing through the condenser lens to be adjusted in an oblique direction. You can also do it.

Figure 2 shows the intentional astigmatism (
A method is shown in which a beam section 11 in a cutting mode and a beam section 12 in a heat treatment mode are created and irradiated onto the workpiece 7.

FIG. 3 shows a beam 15 in a cutting mode and a beam 16 in a heat treatment mode using a deflection prism 13 and a condensing lens 14.
The figure shows a method for making and irradiating the workpiece 7.

The above embodiments show a method of simultaneously irradiating the cutting mode beam and a heat treatment mode beam to the same position on the workpiece, and a method of irradiating the other beam immediately after irradiating one of the beams. Ta.

In addition, a single mode beam is used for the cutting beam, a multimode beam is used for the heat treatment mode,
A method in which the workpiece is irradiated simultaneously or at certain temporal timings also enables the present invention.

Effects of the Invention As described above, the present invention has the following advantages: For example, when high carbon steel is processed by laser, the processed area becomes hard due to the heat, as if it were hardened, and when ceramic material is processed by laser, the processed area becomes hard. Problems such as microcracks can be solved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a main part of a laser processing machine according to one embodiment of the present invention, and FIGS. 2 and 3 are block diagrams of main parts of a laser processing machine according to different embodiments of the present invention. 1. Laser oscillator, 2. Beam, 3.4. Beam splitter, 5, 6. Condensing lens, 7. Workpiece,
8. Beam for cutting mode, 9. Beam for heat treatment mode, 10. Aspherical lens, 13. Deflection prism. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] A beam generating means for cutting and a beam generating means for heat treatment are provided, and the shape of the heat treatment beam is made larger than the shape of the cutting beam on the surface of the workpiece, and the two beams are simultaneously or separately generated. A laser processing machine that is characterized by irradiating the workpiece.