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JP-2026074404-A - Assist gas rectification structure and laser processing head

JP2026074404AJP 2026074404 AJP2026074404 AJP 2026074404AJP-2026074404-A

Abstract

[Problem] To provide an assist gas rectification structure that makes it easy to set the assist gas flow in the optical path space of a laser processing head to any desired flow. [Solution] The assist gas rectification structure (SK) has n (where n is an integer of 2 or more) cylindrical bodies (6,7) inserted in an n-fold stack, and has a first flow path (RT1) that guides assist gas (G2) flowing in from the outside through the through hole (6b) to the end face of the inner cylindrical body (7) through the space (Vc) formed in a groove (74) on the outer peripheral surface (71d) of the inner cylindrical body (7) by connecting the inside and outside of the outer cylindrical body (6) with the space (Vc) inside the groove (74) or second flow path (RT2) that guides the assist gas (G2) flowing in from the outside through the through hole (6b) to the end face of the inner cylindrical body (7) through the space (Vc), or flows through the space (Vc) to an inner through hole (7Dh) that penetrates the groove (74) and the inner peripheral surface (71a) of the inner cylindrical body (7) and guides it to the inner peripheral surface (71a) of the inner cylindrical body (7). [Selection Diagram] Figure 7C

Inventors

  • 望月　達也

Assignees

  • 株式会社アマダ

Dates

Publication Date
20260507
Application Date
20241010

Claims (5)

  1. n (where n is an integer greater than or equal to 2) cylindrical bodies are inserted in an n-fold layer. An assist gas flow straightening structure having a first flow path that connects a through hole connecting the inside and outside of an outer cylindrical body with a space inside a groove formed on the outer circumferential surface of an inner cylindrical body, thereby guiding assist gas flowing in from the outside through the through hole to the end face of the inner cylindrical body through the space.
  2. n (where n is an integer greater than or equal to 2) cylindrical bodies are inserted in an n-fold layer. An assist gas flow straightening structure having a second flow path that connects a through hole connecting the inside and outside of an outer cylindrical body with the space inside a groove formed on the outer circumferential surface of an inner cylindrical body, thereby guiding assist gas flowing in from the outside through the through hole to an inner through hole that penetrates the groove and the inner circumferential surface of the inner cylindrical body through the space, and to the inner circumferential surface of the inner cylindrical body.
  3. The through holes in the outermost cylindrical body are the first and second through holes, which are formed in close proximity in the circumferential or axial direction. The assist gas rectification structure according to claim 1, wherein the first flow path includes two flow paths that independently guide the first assist gas flowing in from the first through hole and the second assist gas flowing in from the second through hole.
  4. The through holes in the outermost cylindrical body are the first and second through holes, which are formed in close proximity in the circumferential or axial direction. The assist gas rectification structure according to claim 2, wherein the second flow path includes two flow paths that independently guide the first assist gas flowing in from the first through hole and the second assist gas flowing in from the second through hole.
  5. A main body having an optical path space for the laser beam inside and emitting the laser beam from its tip, The assist gas rectification structure according to claim 3 or claim 4, arranged in the main body, A first gas supply device that supplies a first assist gas to the first through hole, A second gas supply unit that supplies a second assist gas to the second through-hole, Equipped with, The first assist gas and the second assist gas are guided by the assist gas rectification structure and ejected into the optical path space by the laser processing head.

Description

This invention relates to an assist gas rectification structure and a laser processing head. Patent Document 1 describes a laser processing head having a flow path for assist gas. The laser processing head described in Patent Document 1 has a cylindrical space forming a flow path between the inner surface of a hole in the cylindrical main body and the outer surface of an annular flow path forming ring attached inside the hole, and has a supply port for supplying assist gas to this space. As a result, when two assist gas supply ports are provided, spaced apart in the circumferential direction, the airflow collision points within the cylindrical space become two points spaced apart in the circumferential direction. This suppresses the pressure increase and turbulence within the space caused by airflow collision compared to the case with a single point. Patent No. 6837092 Figure 1 is a longitudinal cross-sectional view illustrating the configuration of a laser processing head 91 according to a first embodiment of the present invention.Figure 2A is a bottom view of the rectifier unit M provided in the laser processing head 91.Figure 2B is a cross-sectional view taken at the S2B-S2B position in Figure 2A.Figure 2C is a perspective view showing the second cylindrical body 2 of the rectifier unit M.Figure 3 is a longitudinal cross-sectional view illustrating the configuration of a modified laser processing head 95, which is a modified version of the laser processing head 91.Figure 4A is a perspective view of the first cylindrical body 6 included in the rectifier unit M2 of the laser processing head 91A according to a second embodiment of the present invention.Figure 4B is a cross-sectional view of the S4B-S4B position in Figure 4A.Figure 4C is an unfolded view of the outer surface 6d of the first cylindrical body 6.Figure 5A is a perspective view of the second cylindrical body 7 of the rectifier unit M.Figure 5B is an unfolded view of the outer surface 71d of the second cylindrical body 7.Figure 6A is a perspective view of the third cylindrical body 8 of the rectifier unit M2.Figure 6B is an unfolded view of the outer surface 8d of the third cylindrical body 8.Figure 7A is a cross-sectional view of the rectifier unit M2 at the S7AL-S7AR position in Figures 4C, 5B, and 6B.Figure 7B is a cross-sectional view of the rectifier unit M2 at the S7BL-S7BR position in Figures 4C, 5B, and 6B.Figure 7C is a cross-sectional view of the rectifier unit M2 at the S7CL-S7CR position in Figures 4C, 5B, and 6B.Figure 8 is a top view illustrating the assist gas ejected from the rectifier unit M2.Figure 9 is a partially enlarged view illustrating a modified example of the third groove 833.Figure 10 is an unfolded view of the outer surface 71d to illustrate modified examples of the first groove 73A and the second groove 74A, which are variations of the first groove 73 and the second groove 74. A laser processing head according to one or more embodiments of the present invention will be described by the laser processing head 91 of the first embodiment and the laser processing head 91A of the second embodiment. (First aspect) The configuration of the laser processing head 91 according to the first embodiment will be described with reference to Figures 1 to 2C. Figure 1 is a longitudinal cross-sectional view illustrating the configuration of the laser processing head 91 according to the first embodiment of the present invention. Figure 2A is a bottom view of the rectifier unit M provided in the laser processing head 91. Figure 2B is a cross-sectional view at the S2B-S2B position in Figure 2A. Figure 2C is a perspective view showing the second cylindrical body 2 provided in the rectifier unit M. For the sake of explanation, the vertical direction will be the direction indicated by the arrow in Figure 1. This vertical direction does not define the operating orientation of the laser processing head 91 or the like. The laser processing head 91 comprises a cylindrical main body 911 and a nozzle 912 attached to the tip of the main body 911. Figure 1 shows a cross-sectional view of the tip of the main body 911. The laser processing head 91 is mounted on a laser processing device (not shown in Figure 1). The laser beam supplied from the laser oscillator (not shown in Figure 1) into the main body 911 is shaped into a desired beam by an optical system 94, such as a focusing lens, and emitted as a laser beam LS from the tip of the nozzle 912. The laser processing device then uses the emitted laser beam LS to laser process a workpiece, such as sheet metal. As shown in Figure 1, the main body 911 is formed in a cylindrical shape with an axis CL9 extending in the vertical direction as its axis, and has a through-hole 913 centered on the axis CL9. A nozzle 912 is detachably attached to the tip of the through-hole 913. An optical system 94 is positioned above the through-hole 913 in Figure 1, and a protective glass 914 is positioned below it to protect