Workpiece posture adjustment method on basis of iterative registration of measuring point geometric features

Abstract

The invention discloses a workpiece posture adjustment method on the basis of iterative registration of measuring point geometric features. The method comprises the following steps of uniformly measuring a coordinate system and a workpiece coordinate system, and detecting a workpiece to obtain contact measurement data; according to the contact measurement data, calculating processing deviations and out-of-tolerance (OT) numbers of measuring points; if the OTs of the measuring points are all not equal to zero, executing step 4, and otherwise, ending the process; selecting an out-of-tolerance curved surface, obtaining a surface rotation registration matrix and a surface translation registration matrix, and coupling the surface rotation registration matrix and the surface translation registration matrix to a workpiece rotation registration matrix and a workpiece translation registration matrix respectively; according to a topological structure of a specified machine tool and the workpiecerotation registration matrix, calculating the adjustment amount of the workpiece coordinate system; according to the workpiece coordinate system of the specified machine tool, re-adjusting the workpiece for locating; adjusting the workpiece coordinate system according to the adjustment amount, detecting the workpiece to obtain the contact measurement data and continuing to adjust the workpiece till the requirements are met. The method is simple and easy to operate and can meet rapid adjustment of the processing posture of a process component under multi-feature and multi-constraint conditions.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a workpiece pose adjustment method based on iterative registration of geometric features of measurement points. Background technique [0002] The precision machining of complex parts usually involves a series of processes. Due to the existence of workpiece positioning errors, deformation errors, machine tool geometric errors and other error factors, the allowance distribution of each process may be uneven, or even out-of-tolerance (OT). Therefore, it is very It is necessary to use precision detection technologies and instruments such as on-machine detection system, contact scanning system, non-contact 3D scanning system, coordinate measuring machine (CMM) and coordinate measuring arm (CMR) to detect the geometric contour of the workpiece between processes; In multi-process processing, the equalization of margin distribution or error compensation in subsequent ...

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Problems solved by technology

[0006] In addition, due to the influence of probe size, pre-defined probing direction and surface curvature, there is no very precise spatial relationship between the actual measurement point and the theoretical measurement point, so the registration cannot be directly determined by the actual initial measurement point and the corresponding theoretical measurement point. At present, there are few related studies on adaptive iterative registration and positioning adjustment methods based on contact measurement under multi-tolerance conditions

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