Contour error suppression method for digital twin-driven multi-axis numerical control machine tool

A contour error, technology of CNC machine tools, applied in the field of CNC machine tools

Active Publication Date: 2021-05-28
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the operation of the multi-axis feed system, the contour error and its influencing factors are constantly changing, and the relationship between them is also time-varying and dynamic, and this relationship is difficult to describe in the form of a function

Method used

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  • Contour error suppression method for digital twin-driven multi-axis numerical control machine tool
  • Contour error suppression method for digital twin-driven multi-axis numerical control machine tool
  • Contour error suppression method for digital twin-driven multi-axis numerical control machine tool

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Experimental program
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Effect test

Embodiment 1

[0034] A digital twin-driven multi-axis CNC machine tool contour error suppression method in this embodiment includes the following steps:

[0035] S1. Establish a virtual model of the digital twin body corresponding to the physical entity, that is, the digital twin body modeling of the multi-axis feed system;

[0036] S2. The virtual-real precise synchronization of the multi-axis feed system, that is, the virtual-real synchronization, establishes a two-way perception relationship between the digital twin and the physical entity through a communication protocol with strong compatibility;

[0037] S3. High-confidence dynamic estimation of contour error, that is, dynamic estimation of contour error, obtaining dynamic characteristic parameters, motion control parameters, nonlinear interference and contour shape parameters. Dynamic characteristic parameters include natural frequency and damping ratio, represented by Dy, motion control Parameters include various controller paramete...

Embodiment 2

[0040] The difference between this embodiment and Embodiment 1 is that in this embodiment, S1-S4 will be specifically supplemented.

[0041] In the digital twin modeling of the S1 multi-axis feed system, considering that the multi-axis feed system has the characteristics of multi-attribute cross-coupling such as structure, mechanics, control, and communication, the digital twin modeling needs to involve dynamics, system identification, Multi-field modeling technologies such as motion control, signal testing, machine learning, network communication and computer. At the same time, due to the change of pose, velocity, acceleration and the influence of nonlinear interference during the operation of the multi-axis feed system, its dynamic characteristics show obvious time-varying, mismatching and uncertainty between axes, digital twins Volume modeling needs to take into account the dual drivers of mechanism and data. Therefore, in view of the above-mentioned characteristics of the...

Embodiment 3

[0072] Compared with Embodiment 1, the only difference is that in S2, the two-way perception relationship between the digital twin and the physical entity is established, and then the model is reconstructed by constructing the digital twin at a slow time scale, and the period is T. Scan the digital twin and the physical entity. When the digital twin is controlled to change within a cycle, it will be synchronized from virtual to real; when the physical entity is controlled to change within a cycle, it will be synchronized by Real-to-virtual synchronization; when the physical entity is controlled to change uncontrolled within a period, the synchronization from real to virtual is suspended in this period, and the physical entity is scanned repeatedly in this period, and the uncontrolled change is marked. Then, before scanning the digital twin in the next cycle, it is finally synchronized from real to virtual.

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Abstract

The invention relates to the field of numerical control machine tools, and particularly discloses a contour error suppression method for a digital twin-driven multi-axis numerical control machine tool. The method comprises the steps of S1 establishing a virtual model of a digital twinborn body corresponding to a physical entity, and adopting a multi-parameter gain scheduling control strategy based on a global task coordinate system, so as to obtain a time-varying coupling mechanism model of a multi-axis feeding system; establishing a data driving model of the multi-axis feeding system by using signal testing and machine learning; S2 performing virtual-real synchronization, and establishing a bidirectional sensing relationship between the digital twinborn body and the physical entity through a communication protocol with strong compatibility; S3 dynamically estimating a contour error; and S4 contour error suppression: according to the pre-estimation model, adopting a multi-objective optimization algorithm to obtain an optimal motion control parameter and a track maximum limiting speed corresponding to the optimal motion control parameter. By adopting the technical scheme of the invention, the contour error can be effectively reduced.

Description

technical field [0001] The invention relates to the field of numerically controlled machine tools, in particular to a method for suppressing contour errors of multi-axis numerically controlled machine tools driven by digital twins. Background technique [0002] Digital twin is a simulation process that makes full use of physical models, sensor updates, operation history, etc., integrates multi-disciplinary, multi-physical quantities, multi-scale, and multi-probability simulation processes, and completes the mapping in the virtual space to reflect the entire life cycle of the corresponding physical equipment. process. A digital twin is a concept beyond reality that can be viewed as a digital twin of one or more important, interdependent equipment systems. [0003] The contour error suppression theory based on digital twin is based on the multi-axis feed system as the carrier, through high-fidelity digital twin modeling, accurate synchronization of virtual and real, high conf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 张雷王勇高翔吴晓强
Owner TIANJIN UNIV OF COMMERCE
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