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2021 Vol. 64, No. 20
Published: 2021-10-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       COVER STORY
1 COVER
2021 Vol. 64 (20): 1-1 [Abstract] ( 102 ) HTMLNew PDF (1877 KB)  ( 48 )
       C0NTENTS
6 CONTENTS
2021 Vol. 64 (20): 6-10 [Abstract] ( 95 ) HTMLNew PDF (982 KB)  ( 36 )
       FEATURE
14 Research on Technology of Robot Grinding on Epoxy Coating for Aircraft Skin
TIAN Fengjie,DENG Cong,HAN Xiao,LI Lun
DOI: 10.16080/j.issn1671-833x.2021.20.014
In order to research the effect of process parameters on removal depth in the process of robot grinding epoxy coating on aircraft skin, a robot automatic grinding platform was built. According to Preston equation, the removal model of epoxy coating was established. The workpiece grinding process was simulated by Deform software and the influence of process parameters on removal depth under the single factor condition was studied. The regression mathematical model of removal depth and workpiece grinding test are established for theoretical analysis and verification. The results show that the removal depth is directly proportional to the grinding pressure and tool rotation speed, inversely proportional to the tool feed speed and abrasive particle size. Grinding pressure has great influence on removal depth, while tool rotation speed has relatively little influence on removal depth. During the grinding process, the uniform removal is realized by controlling the constant contact force and good surface quality is obtained.
2021 Vol. 64 (20): 14-20 [Abstract] ( 237 ) HTMLNew PDF (4547 KB)  ( 389 )
       COVER STORY
22 Research Status and Development Trends of Active Real-Time Control of Aircraft Assembly Quality
XIAO Qingdong, ZHANG Xuerui, GUO Feiyan, HAN Jie, CAO Guanyu
DOI: 10.16080/j.issn1671-833x.2021.20.022
At present, the commonly used aircraft assembly quality control methods have poor real-time performance, and can not be corrected until quality problems occur, which can not meet the requirements of high-efficiency and high-quality aircraft assembly. For this problem, the technical characteristics of active real-time control of aircraft assembly quality, such as systematization, are analyzed, and the framework of active quality prevention in assembly design stage and real-time quality feedback control in process stage is established. In the aspect of active prevention, the mechanism and data models suitable for assembly quality prediction are analyzed, and the research status of mechanism prediction modeling and data prediction modeling is explained, moreover, the effects and advantages of combining the two methods are analyzed. In terms of real-time feedback, main directions in quality process control are discussed, such as flexible tooling, drilling and riveting equipment, digital measurement technology at the basic level of control, virtual assembly and quality evaluation at the level of assembly analysis, quality control system and process quality control methods at the level of system management. On this basis, the development directions of aircraft assembly quality control in multi physical quantity assembly, data fusion quality evaluation, quality control system platform application are pointed out.
2021 Vol. 64 (20): 22-35 [Abstract] ( 269 ) HTMLNew PDF (9619 KB)  ( 246 )
       FORUM
38 Study on Digital Twin-Based Integration Framework of Aerospace Key Parts Machining Workshop
ZHONG Keke,HONG Haibo,SHEN Yiping,QIAN Weiwei,YU Chenglong,WANG Yufei
DOI: 10.16080/j.issn1671-833x.2021.20.038
In view of the increasingly prominent bottlenecks in machining workshop for aerospace key parts under the new situation, such as the long cycle of process optimization, the low efficiency of resource allocation and the lack of means of quality assurance, the concept and methods of digital twins are introduced. Combined with the production and operation characteristics of machining workshop, the digital twin-based integration framework of aerospace key parts machining workshop is introduced. The ways of achieving the twin environment, the mapping hub and the enabling platform through twin data are explained. The optimization of the processing, the mixed-flow scheduling, as well as the quality diagnosis, prediction and control technology are discussed. The development and the integration of machining workshop digital twin system are also discussed so as to achieve the goal of dynamic iterative optimization and efficient collaborative management of the workshop.
2021 Vol. 64 (20): 38-46 [Abstract] ( 170 ) HTMLNew PDF (6600 KB)  ( 494 )
47 Research on MES–MSA Architecture Based on Microservices
OUYANG Senshan, LEI Hao, CHEN Chen, PENG Chun
DOI: 10.16080/j.issn1671-833x.2021.20.047
With the rise of intelligent manufacturing, the MES system will become an enabler for the manufacturing industry to integrate physical space and virtual space. The existing MES system is insufficient in its architecture design to meet explosive and disruptive business needs. This paper proposes a MES system architecture based on microservice, which is composed of interaction layer, decision layer, data layer and perception layer. Each layer is connected by event center, and infrastructure is provided by IT model and supporting platform. This paper expounds the key technologies of MES–MSA architecture, and gives some application scenarios of this architecture. It effectively solves the technical problems of the existing system architecture, such as high coupling degree, weak expansibility and difficulty in integration, and meets the new requirements of intelligent manufacturing for MES system business.
2021 Vol. 64 (20): 47-55 [Abstract] ( 186 ) HTMLNew PDF (2490 KB)  ( 444 )
56 Research Progress on Digital Twin Modeling for Micro Milling
WANG Xuchu, BAI Qingshun, WANG Peng, CHENG Kai, ZHAO Liang
DOI: 10.16080/j.issn1671-833x.2021.20.056
With the characteristics of real-time synchronization, loyal mapping and high-fidelity, digital twin is considered as an important means to realize the interconnection between the physical and information world. In the present work, the state of art and applications of digital twin theory are discussed in detail. Additionally, the paper analyses the progress on digital twin modelling and application in the micro milling of titanium alloy parts, in terms of micro milling technique process, cutting tool status, milling quality and microscale machining equipment. Finally, the essential issues that should be solved in the study of micro milling digital twin modeling, are presented according to the analysis of digital twin application. The establishment of a digital twin simulation model integrating machine, cutting tool and workpiece has important theoretical significance and practical value, which is able to expand application scope of digital twin, improve the efficiency of micro milling, and promote the development of intelligent manufacturing technology.
2021 Vol. 64 (20): 56-64 [Abstract] ( 168 ) HTMLNew PDF (4494 KB)  ( 778 )
65 Configurable Assembly Deviation Analysis Technology Based on Digital Twin Model
WANG Anyang, WANG Zhongqi, XIA Song, CHANG Zhengping, MA Zhikai
DOI: 10.16080/j.issn1671-833x.2021.20.065
Aircraft products have high requirements for geometric assembly accuracy of parts and components in the actual components assembly and final assembly process. Predicting and controlling aircraft assembly accuracy has always been one of the continuous research topics in aviation industry. Aiming at the application of digital twin in the field of assembly simulation, this paper proposed a configurable assembly deviation analysis method based on digital twin model from the perspective of geometric assembly accuracy prediction. The product discrete point cloud and product design model were taken as the geometric expression of the product twin model, and the point cloud constraint registration theory was used to realize the pose adjustment of the assembly feature matching of the part digital twin model. According to the different assembly relationships of the part digital twin model, the solution function of the relative position transformation matrix between the matched parts under various assembly relationships was constructed, and the function library was constructed. Based on the three-dimensional dimension chain model, a configurable dimension chain model was proposed to realize the rapid solution effect of "matching and calculation" of dimension chain. A configurable assembly deviation solving system was developed, and the effectiveness of the method was verified by taking an aircraft door specimens as an example.
2021 Vol. 64 (20): 65-75 [Abstract] ( 190 ) HTMLNew PDF (6902 KB)  ( 237 )
       APPROACHING SCIENCE
76 Breakthrough Key Technology of High-End CNC to Enhance Capacity of Independent Research and Development of Domestic High-End CNC System
2021 Vol. 64 (20): 76-77 [Abstract] ( 118 ) HTMLNew PDF (564 KB)  ( 60 )
       RESEARCH
78 Progress of Hot Metal Plastic Forming Technology for Titanium Alloy Thin-Walled Parts
WU Yong, CHEN Minghe
DOI: 10.16080/j.issn1671-833x.2021.20.078
The hot metal plastic forming technology is an effective manufacturing method to produce the thin-walled parts with complex curved surfaces of the titanium alloy and some other difficult-to-machine materials, including hot pressing forming, creep/stress relaxation forming, hot gas forming, superplastic forming and diffusion bonding, hot flexible forming, and so on. The hot deformation mechanism of titanium alloy is the theoretical basis for the hot metal forming technology. The shapes and performances of the titanium alloy can be coordinately controlled under the appropriate process parameters. The research processes of hot forming technologies, typical defects and their solutions, moulds and high-end hot forming machine tools are summarized. The development trend of titanium alloy thin-walled parts is forecasted.
2021 Vol. 64 (20): 78-87 [Abstract] ( 126 ) HTMLNew PDF (54664 KB)  ( 100 )
88 Ram Structure Optimization of WT700 CNC Gear Milling Machine
TIAN Guofu，ZHANG Kai
DOI: 10.16080/j.issn1671-833x.2021.20.088
According to the structure and bearing characteristics of the WT700 CNC gear milling machine, the finite element model is established, the static and dynamic analyses of typical load case are carried out. The weak part is ram, the topology optimization of ram is achieved by compromise programming method, and the conceptual model of the ram is constructed. The meta structure of the ram is simplified, and the structure with excellent static and dynamic performance is obtained. The lightweight of ram structure is realized on the premise of keeping static and dynamic performance unchanged, and the experimental results show that the mass of ram is reduced by 18.75%.
2021 Vol. 64 (20): 88-91 [Abstract] ( 142 ) HTMLNew PDF (1669 KB)  ( 140 )
92 Preparation of High-Entropy Ceramics and Their Application Status in Thermal/Environmental Barrier Coatings
WEI Fushuang, LIU Yong, ZHANG Xiaodong, ZHANG Dongxing, WANG You
DOI: 10.16080/j.issn1671-833x.2021.20.092
The research of high-entropy ceramics is still immature compared with high-entropy alloys, but a variety of high-entropy ceramics have been explored and prepared. High-entropy ceramic materials have unique structure and excellent properties, of which application prospect is very broad. Among them, the excellent phase stability, good matching with the thermal expansion coefficient of silicon-based ceramics, and excellent resistance to water vapor corrosion makes them very suitable for thermal barrier coatings, environmental barrier coatings and thermal/environmental barrier coatings. It has become a research hotspot of thermal protection coating in recent years. Based on the research on high-entropy ceramics in recent years, this article summarizes the current computer simulation methods, preparation processes and sintering processes used in the research of high-entropy ceramic materials, the application status and shortcomings of high entropy ceramic materials in thermal/environment barrier coatings are pointed out.
2021 Vol. 64 (20): 92-101 [Abstract] ( 213 ) HTMLNew PDF (15427 KB)  ( 252 )
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