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

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...

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 and the size of the Dove prism. An optical element with too large thickness will limit the adjustment response speed and adjustment range of the whole system function, and an excessively large optical element inclination angle will cause loss of laser energy grazing reflection

[0008] 3. The above disclosed drilling methods and device patents all have the problem that the laser beam is tilted away from the optical axis and then refocused, which will cause coma aberration in the focused spot, resulting in distortion of the laser focus, decrease in energy density and uneven distribution, resulting in hole size accuracy and consistency issues

Therefore, the above-mentioned devices all have the problem of energy distribution distortion of obliquely focused light spots away from the optical axis.

Images