Picosecond laser machining apparatus for processing nozzle micropore

Abstract

The invention provides a picosecond laser processing device for fuel nozzle microporous processing, which consists of a picosecond laser, a calibrating system and helical optical processing system. An output terminal of the picosecond laser is provided with a first reflecting mirror and the first reflecting mirror is connected with a second reflecting mirror; an output terminal of the second reflecting mirror is provided with an optical gate and an output terminal of the optical gate is connected with a beam extending lens; an output terminal of the beam extending lens is connected with a third reflecting mirror which is connected with the helical optical processing system through the calibrating system. The device is applicable to the fuel nozzle microporous processing and has the advantages of small thermal effect produced in the processing, smooth nozzle edge, no burr on the internal wall and high processing efficiency and accuracy; the diameter of the nozzle can be adjusted and the minimum is up to 60 um; the shape can be ensured to be cylindrical and the diameter depth ratio is up to 1:20, thus greatly increasing the processing accuracy and quality of the nozzle.

Description

technical field [0001] The invention relates to a picosecond laser processing device, which is used for processing microholes on fuel injection nozzles. Background technique [0002] The fuel injector is installed on the cylinder head of the engine, and its function is to atomize the fuel into finer particles, and spray it into the combustion chamber to form a good combustible mixture with the air, thereby improving the combustion efficiency. The fuel injector is composed of the upper injector body and the lower injector nozzle. The high-pressure fuel is ejected from the nozzle through the injector body to form atomized particles. The size of the particles is determined by the fuel pressure and the diameter of the aperture. The quality of the small holes plays a vital role in the ultimate combustion efficiency. Depending on the type of injector, the shape of the small hole is also different. The diameter of the small hole is between 0.15 and 1mm. At present, the diameter o...

AI Technical Summary

Problems solved by technology

Since the light pulse width generated by the nanosecond laser is nanosecond level, the thermal effect is obvious when interacting with the material, and the edge of the hole is not smooth, burnt, chipped, and thermal cracks, etc., resulting in reduced processing accuracy.

In addition, although the commonly used galvanometer scanning optical system can process micro-holes of about 0.1 mm, its disadvantage is that the processing efficiency is low, the small-aperture depth ratio that can be processed is limited, and it cannot process deep small holes.

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