Laser variable-taper variable-diameter rotary cut hole machining optical system

An optical system and laser technology, used in metal processing equipment, laser welding equipment, manufacturing tools, etc., can solve the problems of uneven distribution, high cost, coma aberration of focusing spot, etc.

Active Publication Date: 2019-11-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Except for the galvanometer scanning device with high cost and complicated control (EP1656234B1), other devices cannot realize the independent adjustment of the two degrees of freedom of the laser incident angle and the laser focus rotation radius, that is, when adjusting the hole radius , the hole taper is also changing; similarly, when the hole taper is adjusted, the hole radius is also changing
The adjustment of the laser beam is very limited, and some specific aperture and taper ratios are not even available
[0007] 2. Optical components such as parallel plates and Dove prisms have a limited ability to shift the laser focus. If you want to obtain a larger amount of translation, you need to increase the inclination angle of the plate, and even increase the thickness of the plate

Method used

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  • Laser variable-taper variable-diameter rotary cut hole machining optical system
  • Laser variable-taper variable-diameter rotary cut hole machining optical system
  • Laser variable-taper variable-diameter rotary cut hole machining optical system

Examples

Experimental program
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Effect test

example 1

[0074] Example 1: 440um thick copper plate prism group compression positive taper hole processing

[0075] A laser with an average power of 60W, a wavelength of 1064nm, and a pulse length of 10ps was used as the light source, and the repetition frequency was selected as 20kHz. The compression ratio of the laser beam unidirectional prism compression device is 4:1; wedge mirrors 5 and 6 use wedge-shaped prisms with a wedge angle of 18°9'; wedge angle of wedge mirror 7 is 3°53'; focusing mirror 8 selects the effective focal length Be the focusing lens of about 50mm; The wedge angle of wedge mirror 9 and 10 is 11 ° 22 '. All lenses are 25.4mm in diameter. The diameter of the input laser beam is 12 mm, and the length in the Y direction of the 4-fold laser beam compression system is compressed to 3 mm. The precision displacement adjustment device 13 is adjusted so that the distance 15 between the wedge mirrors 5 and 6 is 5 mm, and the inclination angle of the laser beam after the f...

example 2

[0076] Example 2: 440um thick copper plate aspherical lens group reverse taper hole processing

[0077] A laser with an average power of 60W, a wavelength of 1064nm, and a pulse length of 10ps was used as the light source, and the repetition frequency was selected as 20kHz. The compression ratio of the laser beam unidirectional aspheric mirror compression device is 4:1; wedge mirrors 29 and 30 are wedge-shaped prisms with a wedge angle of 18°9′; wedge angle of wedge mirror 7 is 3°53′; focusing mirror 8 is selected to be effective The focal length is the focusing lens of about 50mm; The wedge angle of wedge mirror 9 and 10 is 11 ° 22 '. All lenses are 25.4mm in diameter. The diameter of the input laser beam is 12 mm, and the length in the Y direction of the 4-fold laser beam compression system is compressed to 3 mm. The precision displacement adjustment device 13 is adjusted so that the distance 15 between the wedge mirrors 29 and 30 is 25 mm, and the inclination angle of the ...

example 3

[0078] Example 3: 1220um thick nickel-based superalloy prism group cylindrical hole processing

[0079] A laser with an average power of 60W, a wavelength of 1064nm, and a pulse length of 10ps was used as the light source, and the repetition frequency was selected as 20kHz. The compression ratio of the laser beam unidirectional prism group compression device is selected as 4:1; the wedge-shaped mirror 5 and 6 are wedge-shaped prisms with a wedge angle of 18°9'; the wedge angle of the wedge-shaped mirror 7 is 3°53'; the focusing mirror 8 is selected to be effective The focal length is the focusing lens of about 50mm; The wedge angle of wedge mirror 9 and 10 is 11 ° 22 '. All lenses are 25.4mm in diameter. The diameter of the input laser beam is 12 mm, and the length in the Y direction of the 4-fold laser beam compression system is compressed to 3 mm. The precision displacement adjustment device 13 is adjusted so that the distance 15 between the wedge mirrors 5 and 6 is 20 mm, ...

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Abstract

The invention belongs to the field of optical design and discloses a laser variable-taper variable-diameter rotary cut hole machining optical system. The system is provided with a rotary shaft and comprises the following optical components which are arranged in sequence along a light path and include a laser light beam one-way compression assembly, a first wedge-shaped lens set, a single-lens wedge-shaped lens (7), a focus lens (8) and a second wedge-shaped lens set, wherein the first wedge-shaped lens set is composed of two wedge-shaped lenses which are the same in wedge angle and is used foradjusting the offset of laser light beams; the single-lens wedge-shaped lens is used for inducing the laser inclination angle; and the second wedge-shaped lens set is composed of two wedge-shaped lenses which are the same in wedge angle and is used for adjusting the offset of focused light spot. By modifying composition of all the components and cooperative work modes among all the components, the laser inclination angle and the offset from the laser focal point to an optical axis can be independently adjusted in a large range, then the required hole diameter and taper proportioning can be achieved, focused light spot distortion caused by coma after laser focused light spot leaves the optical axis and inclines can be compensated, and the laser variable-taper variable-diameter rotary cut hole machining process which is good in machining effect is achieved.

Description

technical field [0001] The invention belongs to the field of optical design, and more specifically relates to a laser variable-cone and variable-diameter rotary cutting hole processing optical system, which can use laser to realize hole drilling. Background technique [0002] The development of science and technology constantly poses new challenges to manufacturing technology. The manufacturing technical index requirements of many high-end equipment have approached or even exceeded the limit of traditional manufacturing technology, such as aviation / aerospace engine air film holes, direct injection gasoline / diesel engine injectors, ceramic Circuit board array microholes and new metamaterials, etc. Taking fuel nozzles and air film holes of aero-engines as examples, in order to ensure the optimal flow field effect, there are almost strict requirements on hole shape, hole wall flatness and orifice shape. It is difficult to achieve high-quality manufacturing of such holes by usi...

Claims

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Application Information

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IPC IPC(8): B23K26/064B23K26/06B23K26/36B23K26/384
CPCB23K26/064B23K26/06B23K26/36B23K26/384Y02P70/10
Inventor 邓磊敏乔亚庆段军熊伟
Owner HUAZHONG UNIV OF SCI & TECH
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