Forming machining method for oil inlet and conveying pipe of aero-engine

Abstract

The invention relates to a forming machining method for an oil inlet and conveying pipe of an aero-engine. The method is characterized in that a compression mode of filling a filler is used; the invention provides a machining method for reducing a large pipe diameter into a small pipe diameter; technical bottleneck problems of pipe diameter shrinkage of two ends of the oil inlet and conveying pipeand machining of parts locally flattened to be kidney-shaped in the middle section of the pipe are solved. The method is advantaged in that the high-precision machining requirement of the oil inlet and conveying pipe of the aero-engine can be met, the rate of finished products and the percent of pass are greatly increased, in addition, implementation difficulty of the method and device is small,and the method and device can be applied to various flattening forming processes needing to be conducted.

Description

technical field [0001] The invention belongs to the technical field of aero-engine processing and manufacturing, and in particular relates to a molding device and a processing method for shrinking the diameter of both ends of an aero-engine oil inlet and delivery pipe and partially flattening the middle section of the pipe into a waist shape. Background technique [0002] The oil inlet pipeline used by a certain type of turbofan aircraft engine, if attached Figure 2-4 As shown, it is a pipe structure with pipe diameter narrowing at both ends and a waist-shaped part in the middle part. It involves the processing technology of pipe end forming and partial flattening of the middle part of the pipe into a waist shape. A round pipe with a diameter of φ18 is selected for processing. , it is necessary to shrink the pipe diameter of the two ends of the round pipe to the length of 16mm from the port to the size φ Then flatten its middle part to a height dimension of φ The width d...

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Problems solved by technology

[0002] The oil inlet pipeline used by a certain type of turbofan aircraft engine, if attached Figure 2-4 As shown, it is a pipe structure with narrowed pipe diameter at both ends and a waist-shaped part in the middle part. It involves the processing technology of pipe end forming and partial flattening of the middle part of the pipe into a waist shape. A round pipe with a diameter of φ18 is selected for processing. , it is necessary to shrink the pipe diameter of the two ends of the round pipe to the length of 16mm from the port to the size φ Then flatten its middle part to a height dimension of φ The width dimension is The shape of the waist requires high precision after processing, and the processing is difficult, so the size of the part cannot be guaranteed. The key factor in the processing of this part is to control the shrinkage and deformation during the processing process to ensure that the size after molding meets the design size requirements. Due to the high requirements for molding accuracy , so the difficulty of processing is high, and the qualified rate is very low. Therefore, it is urgent to provide a forming processing method for processing the above-mentioned oil pipeline, which can reduce the processing difficulty, improve the processing efficiency and the qualified rate of the finished product

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