A method for positioning a radial reference of an intermediate casing of an aeroengine based on a blank

By using mathematical modeling and CNC machining technology, the radial datum of the intermediate casing of an aero-engine is determined by utilizing the characteristics of the blank. This solves the problem of the inability to locate the radial datum of the part, realizes automated positioning and machining, reduces the dependence on special fixtures, and improves machining efficiency and versatility.

CN115906427BActive Publication Date: 2026-06-16SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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Patent Information

Application Number
CN202211361627.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-02
Publication Date
2026-06-16
Estimated Expiration
2042-11-02

AI Technical Summary

Technical Problem

In the prior art, the parts of the intermediate casing of aero engines are too heavy and the space at the pin holes is too small, making it impossible to determine the radial reference using a special fixture and thus impossible to machine.

Method used

By using mathematical modeling and CNC machining technology, the radial datum is determined by utilizing the characteristics of the blank, and the Siemens G03 command is used to machine the rotating circle, thereby realizing the digital positioning of the radial datum and replacing the traditional mechanical alignment method.

Benefits of technology

It achieves automated positioning of the radial datum of parts, avoids the limitations of special fixtures, improves processing efficiency, reduces procurement costs, and is universal, applicable to the processing of all parts whose datum is determined by the 'one face, two pins' method.

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Abstract

A kind of based on blank's aero-engine intermediate casing radial reference positioning method, based on blank feature, by mathematical modeling, the actual coordinates of two reference holes are taken as known quantity, the actual coordinate value of radial reference is obtained;When part alignment, let part one pin hole be in X axis positive direction, according to part structure, then another pin hole must be in second quadrant, then the actual coordinates of two pin holes can be automatically measured by machine tool online measurement function, the actual coordinate value of radial reference is obtained by using global variable function to call two reference hole coordinates, and finally the automatic positioning of radial reference is completed;In processing, the radial reference of part is determined by aligning the rotary circle.The advantages of the present application are: the problem of unable to process due to special part structure is solved.It can be applied to all parts processing with one-face-two-pin method to determine reference, instead of traditional mechanical alignment method, so that the reference positioning and processing of this type of blank are no longer limited by special fixtures.
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