Laser cutting device

Abstract

An embodiment of the present invention discloses a laser cutting device, which includes: a first shaft body formed with a first laser channel; a second shaft body arranged perpendicular to the first shaft body and capable of rotating around the axis of the first shaft body, on which a second laser channel is formed; a third shaft body arranged perpendicular to the second shaft body and capable of rotating around the axis of the second shaft body, on which a third laser channel is formed; a first reflector arranged to rotate with the second shaft body, which is used to reflect an incident laser beam propagating through the first laser channel into a first reflected laser beam propagating through the second laser channel; a second reflector arranged to rotate with the third shaft body, which is used to reflect the first reflected laser beam into a second reflected laser beam propagating through the third laser channel; and a nozzle arranged on the third shaft body, which is used to spray a high-speed airflow colinear with the second reflected laser beam toward a workpiece, and the second reflected laser beam passes through an opening of the nozzle to cut the workpiece.

Description

Technical Field

[0001] The invention relates to the field of laser cutting, and in particular to a laser cutting device. Background Art

[0002] Laser cutting uses a focusing mirror to focus the laser beam on the surface of the workpiece so that the material of the workpiece melts and vaporizes quickly. The high-speed airflow blows away the slag. At the same time, the high-speed airflow blows away the ionized gas mass to reduce the laser power loss, thereby achieving the cutting of the workpiece. The high-speed airflow has a great influence on the cutting quality.

[0003] Laser cutting is a commonly used cutting method, in which the processing head axis moves along the target trajectory according to the position command sent by the CNC system to complete the cutting of the workpiece. During this period, high-speed airflow is also required to ensure the cutting quality.

[0004] However, for the current high-speed airflow provided for laser cutting, the high-speed airflow provided can easily lead to a decrease in air pressure or air velocity at the cutting seam during the high-speed movement of the processing head. This has no obvious effect on low-power cutting of thin plates, but for high-power cutting of thick plates, the cutting slag cannot be blown away in time due to unstable airflow, resulting in travel slag. The instability of the airflow leads to serious vertical lines on the cutting surface, a rough cutting surface, and a poor cutting effect. Summary of the invention

[0005] In order to solve the above technical problems, an embodiment of the present invention hopes to provide a laser cutting device to solve the problem of speed drop or pressure drop of high-speed airflow during laser processing. It can reduce the airflow pressure drop and improve the airflow pressure during laser cutting, thereby improving the processing surface quality.

[0006] The technical solution of the present invention is achieved in this way:

[0007] An embodiment of the present invention provides a laser cutting device, the device comprising:

[0008] A first shaft body, wherein the first shaft body is formed with a first laser channel extending along an axis of the first shaft body;

[0009] A second shaft body arranged perpendicular to the first shaft body and capable of rotating around the axis of the first shaft body, wherein the second shaft body is formed with a second laser channel extending along the axis of the second shaft body;

[0010] A third shaft body arranged perpendicular to the second shaft body and capable of rotating around the axis of the second shaft body, wherein the third shaft body is formed with a third laser channel extending along the axis of the third shaft body;

[0011] a first reflector configured to rotate together with the second shaft, the first reflector being used to reflect an incident laser beam propagating through the first laser channel into a first reflected laser beam propagating through the second laser channel;

[0012] a second reflecting mirror configured to rotate together with the third shaft, the second reflecting mirror being used to reflect the first reflected laser beam into a second reflected laser beam propagating through the third laser channel;

[0013] A nozzle is disposed on the third shaft, and the nozzle is used to spray a high-speed airflow colinear with the second reflected laser beam toward the workpiece, and the second reflected laser beam passes through an opening of the nozzle to cut the workpiece.

[0014] Since the second reflected laser beam used for cutting the workpiece and the high-speed airflow ejected from the nozzle always remain colinear during the rotation of the second shaft around the axis of the first shaft and / or the rotation of the third shaft around the axis of the second shaft, the high-speed airflow can accurately enter the cut produced by the second reflected laser beam, thereby avoiding a decrease in the air pressure or the flow rate of the airflow, thereby improving the quality of the processed surface.

[0015] Preferably, an annular member having a cylindrical inner surface is fixedly disposed on the first shaft body, the cylindrical inner surface is radially recessed outward to form an annular groove coaxial with the first shaft body, and a columnar member having a cylindrical outer surface matching the cylindrical inner surface is fixedly disposed on the second shaft body, the columnar member forming a columnar member airway, the columnar member airway leading to the annular groove.

[0016] Preferably, two sealing rings are further arranged between the cylindrical inner surface and the cylindrical outer surface and are respectively arranged on different sides of the annular groove in the direction of the first shaft axis.

[0017] Preferably, the columnar member air passage also leads to the air inlet of the nozzle via a first air pipe.

[0018] Preferably, the air passage of the columnar member leads to a first air pipe joint fixedly arranged on the second shaft, and the first air pipe joint is used to connect the first air pipe.

[0019] Preferably, the columnar member air channel is in fluid communication with a connection seat air channel formed by a connection seat fixedly disposed on the second shaft, and the connection seat air channel is in fluid communication with the first air pipe joint.

[0020] Preferably, a second air pipe connector for connecting to an air source is fixedly arranged on the first shaft body, and the second air pipe connector is in fluid communication with the annular component airway via an air passage to lead to the annular groove.

[0021] Preferably, the components defining the gas channel include:

[0022] An adapter sleeve fixedly disposed on the first shaft body, the adapter sleeve being formed with an adapter sleeve air passage;

[0023] An air path sleeve fixedly disposed on the first shaft body, the air path sleeve being formed with an air hole in fluid communication with the air path of the adapter sleeve;

[0024] A second air tube is used to connect the airway sleeve with the airway fluid of the annular member.

[0025] Preferably, a focusing mirror for focusing the second reflected laser beam is arranged between the second reflecting mirror and the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional schematic diagram of a laser cutting device according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Magnified view of the dashed box area in . DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] See also Figure 1 , an embodiment of the present invention provides a laser cutting device 1, the device 1 may include:

[0030] A first shaft body 10, wherein the first shaft body 10 is formed with a first laser channel 10T extending along a first shaft body axis 10X;

[0031] A second shaft body 20 disposed perpendicular to the first shaft body 10 and capable of rotating around the first shaft body axis 10X, for example, along the direction of the arc arrow A1, wherein the second shaft body 20 is formed with a second laser channel 20T extending along the second shaft body axis 20X;

[0032] A third shaft body 30 arranged perpendicular to the second shaft body 20 and capable of rotating around the second shaft body axis 20X, for example, along the direction of the arc arrow A2, wherein the third shaft body 30 is formed with a third laser channel 30T extending along the third shaft body axis 30X;

[0033] A first reflector 40 configured to rotate together with the second shaft 20, wherein the first reflector 40 is used to reflect the incident laser beam L1 propagating through the first laser channel 10T into a first reflected laser beam L2 propagating through the second laser channel 20T;

[0034] A second reflector 50 configured to rotate together with the third shaft 30, wherein the second reflector 50 is used to reflect the first reflected laser beam L2 into a second reflected laser beam L3 propagating through the third laser channel 30T;

[0035] A nozzle 60 is arranged on the third axis 30, and the nozzle 60 is used to spray a high-speed airflow colinear with the second reflected laser beam L3 toward a workpiece not shown in the drawings (for example, it can be located below the nozzle 60), and the second reflected laser beam L3 passes through the opening of the nozzle 60 to cut the workpiece.

[0036] Since the second reflected laser beam L3 used for cutting the workpiece and the high-speed airflow ejected from the nozzle 60 always remain colinear during the rotation of the second shaft 20 around the first shaft axis 10X and / or the rotation of the third shaft 30 around the second shaft axis 20X, the high-speed airflow can accurately enter the cut produced by the second reflected laser beam L3, thereby avoiding a decrease in the air pressure or the air velocity, thereby improving the processing surface quality.

[0037] In the above laser cutting process, the second shaft 20 usually needs to rotate continuously in the same direction. In addition, it is easy to understand that the gas source for providing high-speed gas flow is usually independently or separately arranged relative to the device 1, which raises the question of how to transport the gas provided by the gas source to the nozzle 60. For this, see Figure 2 Combined with Figure 1 , an annular member 11 having a cylindrical inner surface 11S is fixedly arranged on the first shaft body 10, the cylindrical inner surface 11S is radially recessed outward to form an annular groove 11R coaxial with the first shaft body 10, and a columnar member 21 having a cylindrical outer surface 21S matching the cylindrical inner surface 11S is fixedly arranged on the second shaft body 20, and the columnar member 21 is formed with a columnar member air passage 21P, and the columnar member air passage 21P leads to the annular groove 11R. In this way, even if the second shaft body 20 continuously rotates in the same direction, gas can flow between the annular groove 11R of the annular member 11 fixedly arranged on the first shaft body 10 and the columnar member air passage 21P of the columnar member 21 fixedly arranged on the second shaft body 20.

[0038] In order to ensure the airtightness between the columnar member 21 fixedly arranged on the second shaft body 20 and the annular member 11 fixedly arranged on the first shaft body 10 during the rotation of the second shaft body 20 relative to the first shaft body 10, still refer to Figure 2 Combined with Figure 1Two sealing rings O are further provided between the cylindrical inner surface 11S and the cylindrical outer surface 21S and are respectively provided on different sides of the annular groove 11R in the direction of the first shaft axis 10X.

[0039] During the laser rotary cutting process, the third shaft 30 usually needs to rotate within a specific angle range, such as ±130°, and does not need to rotate continuously in the same direction as the second shaft 20. Figure 2 Combined with Figure 1 The columnar member air passage 21P may also lead to the air inlet of the nozzle 60 via the first air pipe P1.

[0040] For the above embodiments, specifically, still refer to Figure 1 The columnar member air passage 21P leads to a first air pipe joint 22 fixedly disposed on the second shaft body 20 , and the first air pipe joint 22 is used to connect the first air pipe P1 .

[0041] For the specific implementation of the columnar member airway 21P leading to the first air pipe connector 22, see Figure 1 The columnar member air passage 21P is in fluid communication with a connection seat air passage 23P formed by a connection seat 23 fixedly disposed on the second shaft body 20 , and the connection seat air passage 23P is in fluid communication with the first air pipe joint 22 .

[0042] See also Figure 1 Combined with Figure 2 A second air pipe connector 12 for connecting an air source not shown in the drawings can be fixedly disposed on the first shaft body 10 , and the second air pipe connector 12 can be connected to an air channel fluid of an annular component not shown in the drawings via a gas channel to lead to the annular groove 11R.

[0043] See also Figure 1 Combined with Figure 2 In one example, the components defining the gas passage may include:

[0044] An adapter sleeve 13 fixedly disposed on the first shaft body 10, wherein the adapter sleeve 13 is formed with an adapter sleeve air passage 13P;

[0045] An air path sleeve 14 fixedly disposed on the first shaft body 10, the air path sleeve 14 being formed with an air hole (not shown in the drawings) in fluid communication with the adapter sleeve air passage 13P;

[0046] The second air pipe P2 is used to connect the airway sleeve 14 with the airway fluid of the annular component.

[0047] Still see Figure 1A focusing mirror 70 for focusing the second reflected laser beam L3 is disposed between the second reflecting mirror 50 and the nozzle 60 .

[0048] Also, see Figure 1 The device 1 may also include a circuit connection sleeve 80 fixedly disposed on the first shaft 10, a shaft end cover 90 for accommodating the circuit connection sleeve 80 in a circumferential manner, a first motor 100 fixedly disposed on the first shaft 10 and used to drive the second shaft 20 to rotate, a second motor 110 fixedly disposed on the second shaft 20 and used to drive the third shaft 30 to rotate, and other components, which are not described in detail here.

[0049] It should be noted that the technical solutions described in the embodiments of the present invention can be combined arbitrarily without conflict.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A laser cutting device, characterized in that: The device comprises: A first shaft body, wherein the first shaft body is formed with a first laser channel extending along an axis of the first shaft body; A second shaft body arranged perpendicular to the first shaft body and capable of rotating around the axis of the first shaft body, wherein the second shaft body is formed with a second laser channel extending along the axis of the second shaft body; A third shaft body arranged perpendicular to the second shaft body and capable of rotating around the axis of the second shaft body, wherein the third shaft body is formed with a third laser channel extending along the axis of the third shaft body; a first reflector configured to rotate together with the second shaft, the first reflector being used to reflect an incident laser beam propagating through the first laser channel into a first reflected laser beam propagating through the second laser channel; a second reflecting mirror configured to rotate together with the third shaft, the second reflecting mirror being used to reflect the first reflected laser beam into a second reflected laser beam propagating through the third laser channel; a nozzle disposed on the third shaft, the nozzle being used to spray a high-speed airflow colinear with the second reflected laser beam toward the workpiece, the second reflected laser beam passing through an opening of the nozzle to cut the workpiece, Wherein, an annular member having a cylindrical inner surface is fixedly arranged on the first shaft body, the cylindrical inner surface is radially concave outward to form an annular groove coaxial with the first shaft body, and a columnar member having a cylindrical outer surface matching the cylindrical inner surface is fixedly arranged on the second shaft body, the columnar member is formed with a columnar member airway, and the columnar member airway leads to the annular groove, The columnar member air passage also leads to the air inlet of the nozzle via the first air pipe. The columnar member airway leads to a first air pipe joint fixedly arranged on the second shaft, and the first air pipe joint is used to connect the first air pipe. The columnar member airway is in fluid communication with a connection seat airway formed by a connection seat fixedly disposed on the second shaft, and the connection seat airway is in fluid communication with the first air pipe joint. Wherein, a second air pipe joint for connecting an air source is fixedly arranged on the first shaft body, and the second air pipe joint is in fluid communication with the air channel of the annular member via an air channel to lead to the annular groove. Wherein, the components defining the gas channel include: An adapter sleeve fixedly disposed on the first shaft body, the adapter sleeve being formed with an adapter sleeve air passage; An air path sleeve fixedly disposed on the first shaft body, the air path sleeve being formed with an air hole in fluid communication with the air path of the adapter sleeve; A second air tube is used to connect the airway sleeve with the airway fluid of the annular member.

2. The device according to claim 1, characterized in that Two sealing rings are further arranged between the cylindrical inner surface and the cylindrical outer surface and are respectively arranged on different sides of the annular groove in the direction of the first shaft axis.

3. The device according to claim 1, characterized in that A focusing mirror for focusing the second reflected laser beam is disposed between the second reflecting mirror and the nozzle.

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