Processing method of fuel injection hole and fuel injection nozzle

Abstract

The invention relates to a method for processing a fuel injection hole and a fuel nozzle, wherein the diameter of the fuel injection hole is the first diameter D1, the processing accuracy of the processing method is within 0.01mm, and electric spark machining is adopted, and the processing The steps of the method include: Step A. Using an electrode with a diameter of the second diameter D2 to act on the workpiece to be processed to open a first hole, the depth of the first hole is the depth of the fuel injection hole, and the depth of the first hole is The diameter is the third diameter D3; Step B. After obtaining the first hole, the electrode used in the step A is replaced with an unused electrode, and the electrode performs circular interpolation feeding discharge to act on the first hole One hole, get the second hole. The micro-electrode used in the processing is processed and prepared by a special segmental cutting method to ensure the machining accuracy and shape of the micro-electrode, as well as the consistency between the electrodes, so as to ensure the processing quality of the fuel injection hole.

Description

technical field [0001] The invention relates to the field of processing and manufacturing, in particular to a method for processing a fuel injection hole and a fuel nozzle. Background technique [0002] The fuel nozzle is a key component of the engine, such as one of the key components of the combustion chamber of the gas turbine engine. Its main function is to atomize the fuel, accelerate the formation of the mixture, ensure stable combustion and improve combustion efficiency, and require high and stable performance requirements , In the working environment of high thrust and high temperature rise in the combustion chamber, the fuel nozzle generally has a thermal protection design structure to avoid low cycle fatigue and creep fatigue aging in a short working cycle. In order to meet the requirements of larger thrust-to-weight ratio, higher combustion efficiency, and more complex working conditions of gas turbine engines, the internal oil circuit of the new generation of fue...

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Problems solved by technology

Although mechanical drilling can obtain good cutting quality, because the burrs at the exit of the drilling turn to the inner wall of the curved flow channel, and the hole diameter is small, the burrs cannot be removed by manual and manual tools (that is, the fuel injection holes need to be near-net shape ), which will directly affect the stability and working performance of the nozzle flow, so the method of mechanical drilling is not suitable for use on nozzle holes of this configuration

[0006] Laser processing is a typical photothermal effect processing process. It is almost not limited by the workpiece material. It can obtain tiny holes with a large depth-to-diameter ratio. Its non-contact processing form has no cutting force and can be used for processing thin-walled parts; laser processing According to the pulse width, it is divided into millisecond laser, nanosecond laser and femtosecond laser. Among them, femtosecond laser processing can obtain tiny holes with almost no remelting layer, but its processing efficiency is low, equipment investment is large, and domestic technology maturity is low. , the control of the processing depth of the closed pipeline is still in the stage of research, and the phenomenon of damage to the wall is easy to occur during the processing of the main fuel injection hole, which cannot meet the performance of the fuel nozzle

[0007] EDM drilling is suitable for the processing of conductive metal materials. It can process tiny holes with a depth-to-diameter ratio of more than 100. When the drilling speed is reduced, the thickness of the remelted layer of EDM drilling can be controlled; however, due to the existence of discharge gaps and abnormal discharge of electro-erosion products, ordinary EDM drilling equipment cannot meet the requirements within 0.01mm. Dimensional processing accuracy, and the orifice is prone to processing taper and rounded corners, these defects will have an adverse effect on the injection performance of the main combustion stage nozzle

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