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Machining process-oriented monitoring method based on digital twin via augmented reality

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Abstract

The change of size, surface roughness, residual stress, and so on profoundly influence the final machining quality of complex mechanical products. Digital twin machining technology can ensure machining quality by observing the machining process in real time. However, the current digital twin systems mainly adopt the display method of virtual-real separation. It leads to transmitting the useful processing information to the on-site technicians ineffectively, limiting the digital twin system to help field processing. The monitoring technology on the machining process by augmented reality based on the digital twin machining system is proposed to deal with this problem. Firstly, the augmented reality dynamic multi-view is constructed based on multi-source heterogeneous data. Secondly, the augmented reality is integrated into the real-time monitoring of the intermediate process of complex products to promote cooperation among the operators and the digital twin machining system. It can avoid irreparable errors when the finished product is nearly completed. Finally, the effectiveness and feasibility of the proposed method will be verified by a monitoring application case.

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Abbreviations

P :

The processing procedure

p i :

One process of P

T i :

The time required to execute a process

k :

A segment of the process pi

t :

The time segment in process

P − St i():

The real state of the product in the physical world

DTP − St i(t, k):

The virtual state of the product in twin world

M − St i(t, k):

The state of machine tool in the physical world

T − St i(t, k):

The state of the tool in the physical world

DTMM :

Digital twin mimic model

GeoM :

The model contains the geometric information of the product

PhyM :

The model contains the physical information of the product

ConM :

The model contains the contextual information of the product

ARDMV :

The augmented reality dynamic multi-view

ARVO :

The augmented reality view object

VO :

View object

VO f :

The fixed view of ARDMV

VO s :

The selected view of ARDMV

VO r :

The recommended view of ARDMV

r p,v :

The rating of the view v in process p

P v :

The view

\( \overline{{\boldsymbol{r}}_{\boldsymbol{v}}} \) :

The average score of the view

w(p, p′):

The similarity of the process between p and p

V p :

The view set of the process p

\( {\boldsymbol{p}}_{\boldsymbol{p},\boldsymbol{v}}^{\boldsymbol{c}} \) :

The recommended score of view v in a process p

C i :

The context information of a dimension

Pos o :

The initial posture

Pos i :

The current attitude estimation

Pos f :

The predicted posture

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Availability of data and materials

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

Funding

This work is financially supported by the National Key Research and Development Plan of China (Grant 2019YFB1706300), in part by the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (Grant No. CUSF-DH-D-2020056), in part by the Fundamental Research Funds for the Central Universities (No. 2232019D3-32), and in part by Shanghai Sailing Program (19YF1401600).

Author information

Authors and Affiliations

Authors

Contributions

Shimin Liu: Conceptualization, methodology, software, writing—original draft, writing—review and editing, resources, data curation, and visualization

Shanyu Lu: Conceptualization, methodology, writing—review and editing, and supervision

Jie Li: Conceptualization, methodology, and supervision

Yuqian Lu: Conceptualization, methodology, and supervision

Xuemin Sun: Software, visualization, and validation

Jinsong Bao: Supervision, project administration, and funding acquisition

Corresponding author

Correspondence to Jinsong Bao.

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Liu, S., Lu, S., Li, J. et al. Machining process-oriented monitoring method based on digital twin via augmented reality. Int J Adv Manuf Technol 113, 3491–3508 (2021). https://doi.org/10.1007/s00170-021-06838-5

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