Preparation method of micro filter screen assembly for aircraft engine oil circuit system

Abstract

The invention provides a minitype filter screen component preparing method for an aircraft engine oil way system. A stretching forming-laser hole punching-vacuum brazing technology is used, the labor intensity of an operator can be lowered, the consistency of products is improved, during a testing or using process, a flow control test is carried out, if an inner-outer pressure difference value of the filtering screen component is too large or small, the pressure difference value can be amended with a laser fusion hole sealing or hole punching method by increasing or decreasing the number of holes, repairability is achieved, and finished product pass rate is improved.

Description

Technical field [0001] The invention belongs to the technical field of filter screen preparation methods, and particularly relates to a method for preparing a micro filter screen assembly used in an aircraft engine oil circuit system. Background technique [0002] A certain type of throttle is used in the oil circuit system of an aircraft engine. Its composition mainly contains two micro filter components, which are installed front and rear. They mainly play a role in controlling the flow. They must be able to withstand a pressure difference of 3 to 4Kg. It has the function of filtering impurities. The filter screen assembly is welded by the filter plate and the frame, with a small size and a complicated structure. The thickness of the filter plate is only 0.1mm, the smallest mesh diameter is 0.2mm, the smallest hole spacing is 0.1mm, the smallest inner diameter is 1.5mm, and the smallest outer diameter is 3.2mm. , The manufacturing process is extremely difficult. At present, f...

AI Technical Summary

Problems solved by technology

The filter screen assembly is welded by the filter piece and the skeleton. It is small in size and complex in structure. The thickness of the filter piece is only 0.1mm, the minimum diameter of the mesh is 0.2mm, the minimum hole spacing is 0.1mm, the minimum inner diameter is 1.5mm, and the minimum outer diameter is 3.2mm. , the manufacturing process is extremely difficult

At present, foreign countries adopt the manufacturing process of "manual drilling mold punching-drawing forming-welding". This method has the following disadvantages: First, manual drilling mold drilling is labor-intensive, the mesh diameter and hole spacing are not easy to guarantee, and the product is consistent. The second is that the strength is greatly reduced after the dense mesh is formed by punching holes first, and it is easy to cause cracks in the process of forming wrinkles by stretching, and the amount of scrap is large; the third is that in the process of forming wrinkles by stretching, as the material The deformation and the holes are also deformed, and some are even blocked, which reduces the effective filtration area; fourth, the process of punching holes first and then stretching is likely to cause stress concentration, and the service life and reliability are reduced; , the number of holes is fixed, the deformation of the holes is uncontrollable during stretching, and when the internal and external pressure difference does not meet the requirements, it cannot be repaired, only scrapped, and the qualified rate of finished products is extremely low

The above-mentioned defects are bottlenecks that cannot be overcome in the process of preparing the micro screen assembly, so it is necessary to improve

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