• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A laser cutting method for complex slotted spinneret capillaries wherein a multi-mode laser beam is reduced to predominantly a single mode and focussed above the work piece. The predominantly single mode is a TEMoo mode. By recutting the capillary slots with the laser, metal oxide particles condensed from the vapor phase and resolidified molten metal on the walls of the slots are removed. <IMAGE>
    公开号:SU1834771A3
    申请号:SU914894474
    申请日:1991-01-28
    公开日:1993-08-15
    发明作者:Kobsa Genri；Erl Mur Starshij Semyuel
    申请人:Du Pont；
    IPC主号:
    专利说明:

    The invention relates to a technology for cutting metal plates.
    The aim of the invention is to expand the technological capabilities of the method.
    Figure 1 shows a diagram of the implementation of the method: figure 2 is a diagram of a device obtained by the described method.
    A pulsed multimode laser beam from a source 1. installed with the possibility of movement along the X, Y and Z axes relative to the table 2 is sent to a metal plate 3 having an upper surface 4 and a lower surface 5 (Fig. 1). On this plate, it is necessary to obtain channels 5 of complex shape (figure 2). These channels 5 contain 4 peripheral recesses 6 of the type of slots, as well as radial slots 7. The recesses 6 are divided by channels 8.
    A multimode beam is obtained from a solid state laser 9 based on yttrium aluminum garnet doped with neodymium (Nd-YAG). A neodymium doped yttrium aluminum garnet laser (Nd-YAG) is preferred.
    Two aperture disks 10. 11 are installed between the rear and front mirrors 12. 13.
    A flat-concave lens 14 with a focal length of 20 mm is placed on the optical axis of the laser outside of the mirror 13. A convex lens 15 with a focal length of + 100 mm is placed coaxially with the lens 14 on the optical axis. In this case, a collimated beam 16 with a diameter of 16 mm is obtained. The second convex lens 17 also has a focal length of +100 mm. She focuses the beam into a spot with a diameter of 35-40 microns above the upper surface 4 of the plate 3 into a spot less than 100 microns in size. In this case, a single-mode beam is obtained, which is a TEMoo mode. The pulse duration of the beam is 200 μs, the frequency is 130-180 Hz. To remove the molten metal formed during cutting, a working medium 18 is supplied coaxially with the beam, which is used as oxygen. Cutting can be done in one or more passes.
    In the experiment, it was found that the pulse frequency of the beam should be 130 Hz.
    1834771 AZ
    At a cutting speed of 50 mm / s and a frequency of 130 Hz, the workpiece to be machined was moved approximately 6 microns between pulses. On the other hand, when the frequency of the pulses was greater than the aforementioned 130 Hz, the laser power fell, and the laser did not work at a frequency of more than 185 Hz, with a voltage of 500 V on the incandescent lamp, and a pulse duration of 200 μs. A higher pulse frequency could be obtained with shorter tube pulses, for example, With tube pulses of 175 μs, frequencies of approximately 150-160 Hz. At a voltage of 500 V on the lamp and a pulse duration of 200 μs, the laser pulse duration was 125 μs at a frequency of 130 Hz.
    The main requirement was the supply of short, dense pulses of 40 MW / cm 2 with a sufficient low duty cycle to avoid overheating of the workpiece at low cutting speeds.
    The mechanical strength of the focusing lens limited the pressure of the working gas.
    Several gases were tested, the use of purified oxygen was the most effective. The distance between the cutting tip and the workpiece is approximately 400 mm.
    The beam was focused not on the workpiece, but on a distance of approximately 2 mm,
    权利要求:
    Claims (8)
    [1]
    Claim
    1. The method of laser cutting of a metal plate, in which a pulsed focused multimode laser beam is directed to the upper surface of the plate to obtain a liquid bath between the upper and lower surfaces of the plate and remove liquid metal from the lower surface by a stream of compressed working medium, coaxial with the beam, characterized in that , in order to expand technological capabilities. previously, the multimode beam is converted to a single-mode beam, and the beam is focused on the upper surface of the plate into a spot smaller than 100 microns.
    [2]
    2. The method according to claim 1, with the fact that the single-mode beam is TEM 00 -. fashion.
    [3]
    3. The method according to claim 1. Characterized in that the pulse duration of the beam is 200 μs.
    [4]
    4. The method according to p. 3, characterized in that the pulse frequency of the beam is 130 180 Hz.
    [5]
    5. The method according to claim 1, characterized in that oxygen is used as the working medium.
    [6]
    6. The method according to claim 1, characterized in that upon receipt of the capillary channels, the plate is moved relative to the beam along a predetermined path in at least one pass.
    [7]
    7. The method according to claim 6, characterized in that the channels are obtained in at least two passes.
    [8]
    8. The method according to claim 6, characterized in that the channels are obtained in at least three passes.
    FIG. 1
    类似技术:
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    同族专利:
    公开号 | 公开日
    BR9100338A|1991-10-22|
    EP0440397A2|1991-08-07|
    DE69117996T2|1996-09-12|
    CA2034551C|2000-08-01|
    EP0440397B1|1996-03-20|
    EP0440397A3|1991-10-02|
    CA2034551A1|1991-07-30|
    JPH04238683A|1992-08-26|
    DE69117996D1|1996-04-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU179186U1|2017-07-24|2018-05-03|Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук |Device for removing gaseous laser cutting products|
    RU180970U1|2017-08-01|2018-07-02|Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук |Device for removing gaseous and solid laser cutting products|
    RU2674916C2|2014-10-13|2018-12-14|Эвана Текнолоджис, Уаб|Laser treatment method for dividing or scribing substrate by forming wedge-like damaged structures|
    DE4226620C2|1992-08-12|1995-01-19|Thyssen Stahl Ag|Process for laser beam cutting of strip or plate-shaped workpieces, in particular of electrical sheet|
    JP4055353B2|2000-11-07|2008-03-05|松下電器産業株式会社|Optical processing equipment|
    US20020060182A1|2000-11-17|2002-05-23|O'connell Daniel J.|Edge-type filter|
    DE102006013170A1|2006-03-22|2007-09-27|Irema-Filter Gmbh|Foldable nonwoven material useful as air filter element in motor vehicle, comprises form stabilized thicker fiber carrier material and thinner fibers determining the filtering effect|
    CN112809211B|2021-04-19|2021-08-03|烟台恩邦智能科技有限公司|High-precision laser cutting machine|
    法律状态:
    2010-07-20| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20070129 |
    优先权:
    申请号 | 申请日 | 专利标题
    US47160390A| true| 1990-01-29|1990-01-29|
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