阅读说明：本技术 激光加工机 (Laser processing machine ) 是由 石黑宏明 伊藤亮平 小林哲也 于 2018-05-23 设计创作，主要内容包括：轮廓选择器(31)具有至少一个通过使入射的激光折射来变换光束轮廓的光束成形透镜,并射出具有从多个光束轮廓中选择的光束轮廓的激光。准直透镜(33)将入射的发散光的激光变换为准直光。聚焦透镜(36)使从准直透镜(33)射出的准直光聚焦并向加工对象的金属板(W)照射。移动机构(34)以减小从聚焦透镜(36)射出的聚焦光的伴随着利用轮廓选择器(31)进行的光束轮廓选择而发生的焦点位置的偏移的方式使准直透镜(33)沿光轴移动。(The profile selector (31) has at least one beam shaping lens that transforms a beam profile by refracting incident laser light, and emits laser light having a beam profile selected from a plurality of beam profiles. The collimator lens (33) converts incident laser light of divergent light into collimated light. The focusing lens (36) focuses the collimated light emitted from the collimating lens (33) and irradiates the metal plate (W) to be processed. The moving mechanism (34) moves the collimator lens (33) along the optical axis so as to reduce the shift of the focal position of the focused light emitted from the focusing lens (36) accompanying the beam profile selection by the profile selector (31).)

1. A laser processing machine is characterized by comprising:

a profile selector having at least one beam shaping lens that transforms a beam profile by refracting incident laser light and emitting laser light having a beam profile selected from a plurality of beam profiles;

a collimator lens that converts incident laser light of divergent light into collimated light;

a focusing lens for focusing the collimated light emitted from the collimating lens and irradiating the focused light onto a metal plate to be processed; and

and a moving mechanism that moves the collimator lens along an optical axis so as to reduce a shift in a focal position of the focused light emitted from the focus lens, the shift being caused by the beam profile selection by the profile selector.

2. The laser processing machine according to claim 1,

the beam profile of the laser light incident to the profile selector is gaussian,

the contour selector has: a non-beam shaping unit that emits a gaussian laser beam as a gaussian laser beam without performing beam shaping on the gaussian laser beam; and a polygonal lens as a beam shaping lens for converting a gaussian laser beam into a top hat type.

3. The laser processing machine according to claim 1,

the beam profile of the laser light incident to the profile selector is gaussian,

the contour selector has: a non-beam shaping unit that emits a gaussian laser beam as a gaussian laser beam without performing beam shaping on the gaussian laser beam; and an axicon lens as a beam shaping lens for converting a gaussian laser beam into a ring-shaped beam by beam shaping.

4. The laser processing machine according to claim 1,

the beam profile of the laser light incident to the profile selector is gaussian,

the contour selector has: a non-beam shaping unit that emits a gaussian laser beam as a gaussian laser beam without performing beam shaping on the gaussian laser beam; a polygonal lens as a first beam shaping lens for converting a gaussian laser beam into a top hat type; and an axicon lens as a second beam shaping lens for converting the Gaussian laser beam into a ring shape by beam shaping.

5. The laser processing machine according to claim 4,

the profile selector has a base plate that configures the non-beam-shaping portion, the polygonal lens, and the axicon lens to be located on one circumference,

the laser processing apparatus further includes a rotating mechanism that rotates the base plate to select a beam profile of the laser beam emitted from the profile selector from among a gaussian profile, a top hat profile, and a ring profile.

6. The laser processing machine according to any one of claims 1 to 5,

laser light of divergent light emitted from an emission end of a process fiber for transmitting the laser light emitted from the laser oscillator is incident on the collimator lens,

the profile selector is disposed between the exit end and the collimating lens.

Technical Field

The present disclosure relates to a laser processing machine that processes a metal plate with laser light.

Background

A laser processing machine that cuts or welds a metal plate with laser light emitted from a laser oscillator and performs processing by marking the metal plate is becoming popular. Various laser oscillators are available for laser processing machines. For example, a fiber laser oscillator is preferably used to cut a metal plate having a small thickness at a high speed.

Disclosure of Invention

The laser processing machine needs to appropriately set a beam profile for irradiating a laser beam to a metal plate according to a processing condition of the metal plate. Patent documents 1 and 2 describe a laser processing machine capable of processing a metal plate by selecting an arbitrary beam profile from a plurality of beam profiles.

The structures for selecting the beam profile described in patent documents 1 and 2 are complicated, and it is desired to obtain a laser processing machine capable of selecting the beam profile with a simple and inexpensive structure.

Drawings

Fig. 1 is a diagram showing an example of the overall configuration of a laser beam machine according to a first embodiment.

Fig. 2 is a plan view showing a configuration example of the contour selector 31 and the rotation mechanism 32 in fig. 1.

Fig. 3 is a plan view showing a configuration example of the beam shaping lens 313 (polyhedral lens) included in the contour selector 31.

Fig. 4 is a side view showing a configuration example of the beam shaping lens 314 (axicon lens) included in the contour selector 31.

Fig. 5 is a side view showing a configuration example of the moving mechanism 34 in fig. 1.

Fig. 6 is a diagram showing a state in which the contour selector 31 is set such that the beam shaping lens 313 is positioned on the optical axis of the laser beam in the laser processing machine according to the first embodiment.

Fig. 7 is a plan view showing the contour selector 31 set in a state where the beam shaping lens 313 is positioned on the optical axis of the laser beam.

Fig. 8 is a diagram showing a state in which the contour selector 31 is set such that the beam shaping lens 314 is positioned on the optical axis of the laser beam in the laser processing machine according to the first embodiment.

Fig. 9 is a plan view showing the contour selector 31 set in a state where the beam shaping lens 314 is positioned on the optical axis of the laser beam.

Fig. 10 is a diagram showing an example of the overall configuration of the laser beam machine according to the second embodiment.

Fig. 11 is a diagram showing an example of the overall configuration of a laser beam machine according to a third embodiment.

Fig. 12 is a diagram showing an example of the overall configuration of a laser beam machine according to the fourth embodiment.

Fig. 13 is a diagram showing a rectangular contour selector 310 as a modification of the laser beam machine according to the first to fourth embodiments.

An object of an embodiment is to provide a laser processing machine capable of processing a metal plate by selecting an arbitrary beam profile from a plurality of beam profiles with a simple and inexpensive configuration.

According to one aspect of the present invention, there is provided a laser processing machine including: a profile selector having at least one beam shaping lens that transforms a beam profile by refracting incident laser light and emitting laser light having a beam profile selected from a plurality of beam profiles; a collimator lens that converts incident laser light of divergent light into collimated light; a focusing lens for focusing the collimated light emitted from the collimating lens and irradiating the focused light onto a metal plate to be processed; and a moving mechanism that moves the collimator lens along an optical axis so as to reduce a shift in a focal position of the focused light emitted from the focus lens, the shift being caused by the beam profile selection by the profile selector.

The laser beam machine according to the embodiment can process a metal plate by selecting an arbitrary beam profile from a plurality of beam profiles with a simple and inexpensive configuration.