Tooling and method for processing micro-groove structure at the outlet end of inner plug of engine injector

Abstract

The invention relates to a micro-groove structure processing tool and method at the outlet end of an inner plug of an engine injector. The method is as follows: designing a clamping tool that is convenient for clamping of a wire cutting machine tool and can ensure accurate positioning of the inner plug parts, and then the wire cutting equipment is precisely located. Clamp it on the inner bolt of the tooling, then precisely align the initial position of the electrode wire according to the position of the micro-groove structure to be processed, then set the electric machining parameters to process the first pair of micro-groove structures, and finally repeat the precision when processing the subsequent micro-groove structures. Find out. The tooling includes a cylindrical alignment part, and there are bosses on both sides of the alignment part. The boss on one side is recorded as the clamping part, which is used to clamp the wire cutting equipment, and the boss on the other side is recorded as the positioning part. The outer surface of the positioning part is closely matched with the central concave hole of the mounting flange, the clamping part, the alignment part and the positioning part are coaxial, and the bottom surface of the alignment part is perpendicular to the cylindrical surface of the clamping part. The invention solves the processing problem required by the high precision of the outlet structure of the inner plug in the injector.

Description

technical field [0001] The invention relates to the technical field of special processing, in particular to a precision processing method for a high-density symmetrical micro-groove structure of an injector. Background technique [0002] In the field of aerospace, the pintle injector is a common injector mode, and the outlet structure of the inner plug part in the injector directly determines the control of the flow rate and uniformity. In order to achieve the purpose of precise flow control, a newly developed engine injector adopts the combination of high-density symmetrical micro-groove structure + annular seam for the first time, and the outlet end of the inner plug contains 36 (a total of 18) Right) micro-groove structure, its size is small (depth 0.14mm, width 0.3mm), high precision requirements, and the consistency and position of the micro-groove are extremely demanding, the area and position of the micro-groove structure directly affect the flow rate of the injector ...

AI Technical Summary

Problems solved by technology

At present, the precision machining methods for the micro-groove structure mainly include cutting and wire-cutting, but the cutting process is limited by the high-precision size and high-position requirements of the micro-groove structure, and it is difficult to meet the requirements of the parts. Wire-cut processing is based on its Non-contact processing has the advantages of no obvious macro stress, small size processing and high positioning accuracy, and can realize the precision processing of high-density micro-grooves. However, because the flange of the inner bolt part has a square structure, it is very difficult to accurately position and clamp. At the same time, There are also many factors that affect wire cutting processing. Improper alignment methods and electrical processing parameters will cause the size uniformity and surface finish of the high-density symmetrical micro-groove structure to be difficult to meet the requirements.

At the same time, there are a total of 36 micro-groove structures in the injector, which require up to 18 repeated flips. During the processing, it is easy to accumulate clamping and positioning errors. It is difficult to ensure the consistency of uniformly distributed micro-grooves. Therefore, it is necessary to Using a dedicated method to ensure the area and position of multiple microgroove structures

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