Registration method based on datum constraint and allowance constraint of cylindrical surface

Abstract

The invention discloses a registration method based on a datum constraint and an allowance constraint of a cylindrical surface, comprising the following steps of S1, selecting a theoretical cylindrical surface datum according to the cylindrical surface; S2, respectively detecting a to-be-machined surface and a reference portion of a part; S3, fitting cylindrical surface detection points to obtainthe fitted cylindrical surface datum, moving the theoretical cylindrical datum to the fitted cylindrical surface datum to obtain a first rotation matrix R1 and a first translation vector T1, and transforming to-be-machined surface detection points according to the first rotation matrix R1 and the first translation vector T1 to obtain theoretical machining points; S4, establishing a local coordinate system, then establishing a registration model under the local coordinate system. limiting the freedom of motion through the local coordinate system, controlling the machining allowance of the to-be-machined surface through the allowance constraint, and solving the registration model; and S5, converting a registration result calculated in the local coordinate system into a global coordinate system and outputting a final registration result. The registration method is applied to the field of machining.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a registration method based on cylindrical surface reference constraints and margin constraints. Background technique [0002] For large-scale aerospace structural parts, due to its assembly requirements, it is necessary to maintain the positional relationship of related holes or shafts between different parts. Therefore, for each part, the position of holes or shafts is extremely important, and other geometric features need to be guaranteed. The positional relationship with respect to these holes or axes. For example, for a large slide rail part, the positional relationship of its guide rail surface relative to a reference hole is an important indicator of the part, and plays an important role in ensuring the movement of the aircraft flap. Since the processing method of the hole or shaft is relatively simple, the preparation is usually completed before finishing. ...

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Problems solved by technology

[0004] For the parts that have been prepared for this kind of reference hole (or reference axis), in the process of using the registration technology based on measurement points to realize the adaptive positioning of parts, we cannot only rely on the distance between the detection point of the surface to be processed and its theoretical surface. Minimum distance for registration

This will result in a match between the theoretical surface to be processed and the measured surface, but because the measured surface itself has a poor positional relationship with respect to the theoretical cylindrical surface datum, it is difficult to guarantee the positional relationship of the finished surface with respect to the theoretical cylindrical surface datum

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