Machine tool assembly error prediction and control method

Abstract

The invention discloses a machine tool assembly error prediction and control method which comprises the following steps: (1) based on a Hertz contact theory, establishing and linearing a rolling guiderail error-workbench error transfer model based on deformation coordination; (2) for a precise horizontal machining center, establishing a finite element model by means of ABAQUS simulation software,and extracting a gravity deformation result of each assembly step; (3) on the basis of an assembly error transfer model based on a differential vector method, establishing a complete machine error model considering assembly deformation and guide rail errors; and (4) for the established complete machine error model, providing a corresponding assembly error adjustment and control strategy. The influence of the rolling guide rail geometric error on error transmission is comprehensively considered, and the method better conforms to the objective installation condition; the variability of gravitydeformation is considered, the deformation result is analyzed step by step, and step-by-step prediction and tail end error control are achieved more accurately.

Description

technical field [0001] The invention relates to the field of assembling and testing of numerically controlled machine tools, in particular to a method for predicting and controlling machine tool assembling errors taking into account rolling guide rail errors and gravity deformation of structural parts. Background technique [0002] High-speed, high-precision, and high-reliability precision machining centers have become the development direction of modern equipment manufacturing [1]. Many countries regard the development of precision CNC machine tools as the primary task of developing high-end manufacturing. As an important CNC machine tool, the precision horizontal machining center has a series of advantages such as high degree of automation and high processing efficiency, and is widely used in aerospace, aviation, precision mold processing and other fields. [0003] There is no clear and effective guidance method for guide rail installation and adjustment, which takes up a ...

AI Technical Summary

Problems solved by technology

[0003] There is no clear and effective guidance method for guide rail installation and adjustment, which takes up a lot of time in the assembly process. Technicians often ignore the effect of guide rail errors on the error transfer of sliders and moving parts under the effect of geometric errors such as straightness on the rolling joint surface.

At the same time, the gravity deformation of parts during the assembly process has a great influence on the assembly error. At present, the anti-deformation strategy is often used to compensate for the assembly work of machine tools, but the control amount of anti-deformation is not very accurate, and the transfer effect of the guide rail error is not considered. Failure to establish a functional relationship between the deformation deviation and the homogenization of the guide rails and the final assembly error

[0004] Therefore, the current traditional assembly process mainly depends on the experience of workers, lacks scientific theoretical analysis and guidance specifications, and it is difficult to guarantee assembly reliability and low assembly efficiency.

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