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2021 Vol. 64, No. 4
Published: 2021-02-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Performance Evaluation on Grinding of Nickel-Based Superalloy GH4169 Using New Corundum Abrasive Wheel
LI Benkai,DING Wenfeng,MA Yanyan,XIAO Hong,HUANG Qingfei,SI Wenyuan,YANG Jia
DOI: 10.16080/j.issn1671-833x.2021.04.014
Nickel-based superalloys are commonly used materials in the field of aircraft engines. There are some issues on grinding of nickel-based superalloy, such as serious tool wear and short service life. In this paper, the experiments on grinding of nickel-based superalloy material GH4169 was conducted using three kinds of newly developed corundum abrasive wheels, namely, microcrystalline and single crystalline mixed corundum abrasive wheel with the grain size of 60#, single crystalline corundum abrasive wheel with the grain size of 60#, and single crystalline corundum abrasive wheel with the grain size of 70#. The grinding performance was evaluated from the grinding force, grinding temperature, abrasive wheel wear, and surface roughness. The results showed that there was no obvious difference in abrasive wheel wear and surface roughness when grinding GH4169 material with three kinds of grinding wheels. However, through the comprehensive evaluation of grinding force and grinding temperature, it is found that the single crystalline corundum abrasive wheel with the grain size of 60# has better grinding performance. The grinding ratio of the three kinds of abrasive wheels was in the range of 0.5–3. The surface roughness Ra is less than 0.4μm under normal grinding conditions. Besides, it is found that the abrasive wheel wear (mainly including the crushing and shedding of abrasive grains) is an important reason for the formation of grinding surface defects.
2021 Vol. 64 (4): 14-19 [Abstract] ( 231 ) HTMLNew PDF (3171 KB)  ( 287 )
       COVER STORY
20 Research Progress on Three-Dimensional Imaging of Thermal Barrier Coatings for Turbine Blade
AO Bo, WU Guanhua
DOI: 10.16080/j.issn1671-833x.2021.04.020
Thermal barrier coatings (TBCs) is a key technology of high temperature protection of turbine blade, which has typical layered structure characteristics. Thermally grown oxide (TGO) is produced by high temperature oxidation during the service of the thermal barrier coatings, and there is an urgent need for three-dimensional imaging method which will detect the internal structure of thermal barrier coatings nondestructively. Because three-dimensional images can be obtained by computed tomography (CT), and the three-dimensional structure of the object can be reproduced accurately, it is one of the best analysis methods for the layered structure of thermal barrier coatings, and has a good performance in thermal barrier coatings spraying quality evaluation and high temperature oxidation monitoring. In this paper, the development of micro-CT imaging, synchrotron radiation CT imaging, 3D imaging of focused ion beam–scanning electron microscope (FIB–SEM) and thermal stress finite element simulation of thermal barrier coatings in domestic and abroad are mainly introduced. Finally, the possible development direction is pointed out.
2021 Vol. 64 (4): 20-27 [Abstract] ( 276 ) HTMLNew PDF (3416 KB)  ( 441 )
       FORUM
30 Research Progress on Analysis and Control of Assembly Deviation of Flexible Parts in Aircraft Structures
YANG Haoran, AN Luling, LI Xueting
DOI: 10.16080/j.issn1671-833x.2021.04.030
Assembly deviation analysis and control of aircraft complaint structure is always a difficulty in aircraft assembly. With the extensive application of composite materials in aircraft structure, this problem is exposed more and more obviously. As the composite parts manufactured by prepreg curing process have the characteristics of large manufacturing deviation and easy damage in non-principal stress direction in the assembly process, so higher requirements are put forward for the deviation analysis and control in the assembly of flexible parts. It is a difficult problem for assembly of composite complaint parts at present, that how to carry out tolerance allocating, technological compensation and over-constrained assembly reasonably to meet the performance requirements after assembly. This paper expounded and summarized the research progress of the deviation analysis and control of flexible parts assembly in aircraft structure, and provided a reference for assembly of aircraft flexible parts.
2021 Vol. 64 (4): 30-37 [Abstract] ( 270 ) HTMLNew PDF (8413 KB)  ( 259 )
38 Research Status and Its Perspective of Automated Integrated Detection Technology for Aircraft Cables
WANG Falin,LI Zhinong,WANG Na
DOI: 10.16080/j.issn1671-833x.2021.04.038
Aircraft cable integration testing is an important task in the assembly process of an aircraft, and is a key link related to the quality of cable manufacturing and has received extensive attention in aviation manufacturing companies. The aircraft cable testing methods are compared and analyzed. The connotation and main research contents of cable automation integrated testing are introduced, and the current research status of cable automation integrated testing at home and abroad are also analyzed and compared, the problems and development trends of cable automation integrated testing are analyzed and pointed out. Finally, the application of digital twin technology in the field of cable automation integrated detection is prospected.
2021 Vol. 64 (4): 38-49 [Abstract] ( 342 ) HTMLNew PDF (1827 KB)  ( 865 )
50 Flexible Assembly System of Aircraft Panel Based on Inner Surface of Skin Positioning
CHANG Songyang,WANG Hongsheng,SHANGGUAN Jingyi,ZHU Lei,FENG Jun,ZHENG Chenji,FANG Qiang
DOI: 10.16080/j.issn1671-833x.2021.04.050
In order to meet the requirements of digital and flexible manufacturing of aircraft panel, this paper proposes a flexible assembly method of aircraft panel based on inner surface of skin positioning. Through the application of finite element parametric modeling and the optimization algorithm of skin support points, the optimization design of fixture board layout is realized. According to the positioning requirements of each part of the panel component, the flexible positioning method of stringer, skin and shear clip in the flexible assembly system was designed in detail, and the distributed network control system based on EtherCAT fieldbus technology was developed to complete the panel assembly. Through the application of this system, the assembly of four panels can be completed on one flexible tooling, which changes the traditional design approach and is of great significance to the development of aircraft panel flexible assembly technology
2021 Vol. 64 (4): 50-58 [Abstract] ( 258 ) HTMLNew PDF (3864 KB)  ( 570 )
59 Typical Module Integrated Simulation for Aero-Engine Pulse Final Assembly Line
XU Yao,LIAN Yuchen,CHENG Huanchong,WU Dianliang, ZHOU Shuo
DOI: 10.16080/j.issn1671-833x.2021.04.059
The aero-engine pulse final assembly line (PFAL) has the characteristics of complex main equipment, high construction and operation cost. The single station module is the basic unit of PFAL, which undertakes the tasks of pulsating transportation, clamping and fixing, large parts docking and parts installation, therefore, it is difficult to plan the process flow and design the equipment motion program. The integrated simulation of PFAL can verify the structure and mechanism design, workflow design and motion control design of single-module, which is of great significance for typical module development. In this paper, a typical module integrated simulation with man-in-loop scheme based on digital twin model and actual control signal is proposed. Based on this scheme, the domestic simulation software and integrated simulation platform with complete intellectual property rights are developed, and the evaluation of a certain type of aircraft generator pulse assembly process is completed. The results show that the developed platform can be used to evaluate the new pulsation assembly process of aero-engine, and can support the scheme validation and operation training of man-in-the loop.
2021 Vol. 64 (4): 59-65 [Abstract] ( 250 ) HTMLNew PDF (4563 KB)  ( 655 )
66 Research on Precision Assembly Technology of Large Super Flat Support Platform for Spacecraft Low Gravity Simulation
XU Bo, ZHAO Chaoze, ZHANG Ji, WANG Litong, LI Bo, ZHAO Baoshan
DOI: 10.16080/j.issn1671-833x.2021.04.066
As a large precision test equipment for low gravity simulation of spacecraft, the large super flat support platform has the characteristics of large size, high bearing stiffness and automatic and precise adjustment. Based on large super flat support platform assembly requirement and difficulty analysis, building an assembly system, drawing assembly process flow, designing and adjusting mechanism and adjusting the process flow, and for building virtual contour, precision measurement, assembly path planning control strategy, and other key digital automatic assembly technologies are studied. Finally, precise measurement and adjustment is achieved by the large flat supporting platform, and the completion of high efficiency, high quality of precise assembly of 200 pieces of platform is realized.
2021 Vol. 64 (4): 66-73 [Abstract] ( 238 ) HTMLNew PDF (4002 KB)  ( 469 )
74 Assembly Semantic Information Modeling Based on Knowledge Graph
GU Xinghai，BAO Jinsong，Lü Chaofan
DOI: 10.16080/j.issn1671-833x.2021.04.074
Aiming at the problem that assembly data of assembly products usually scattered in the CAD model and the assembly process document, thus different types of assembly semantics information cannot be interconnected due to the heterogeneity, a modeling method for assembly semantic information based on knowledge graph is proposed. Combing with traditional data mapping and natural language processing in artificial intelligence, the intelligent integration of geometric information from the CAD model and assembly process information from the document is realized. Firstly, the concepts, entity classes and relation classes representing different levels of semantic features in the knowledge graph-based assembly semantics model (KG–ASM) are described. Secondly, according to the CAD model file and assembly process document, the instance nodes of the KG–ASM are automatically constructed based on data extraction, semantics mapping and natural language processing techniques. Finally, the assembly process of the speed adjusting mechanism in aviation product as an example is given to verify the feasibility of the KG-ASM and its construction method.
2021 Vol. 64 (4): 74-81 [Abstract] ( 310 ) HTMLNew PDF (2330 KB)  ( 1021 )
       APPROACHING SCIENCE
82 Developing Aerospace Intelligent Manufacturing Engineering, Promoting Transformation and Upgrading of Aerospace Product Manufacturing Models, and Supporting Construction of Aerospace Power
2021 Vol. 64 (4): 82-83 [Abstract] ( 132 ) HTMLNew PDF (649 KB)  ( 125 )
       RESEARCH
84 Research on Three Dimensional Process Design Technology of Aircraft Consumption Based on Module
LI Wanli, XIE Ansheng, SHANG Yan, HAN Wei, ZHANG Shangan, MA Pingshe, KONG Xiangkun, SHU Chao
DOI: 10.16080/j.issn1671-833x.2021.04.084
With the development of MBD technology, 3D process design technology has gradually replaced the traditional 2D process design. Combining with 3D process design technology development of aircraft both at home and abroad, based on the module of product data management and consumption type 3D technology design principle are introduced, the consumption based on modular type 3D process design idea and implement process management are illustrated, and the effect of the application is summarized.
2021 Vol. 64 (4): 84-90 [Abstract] ( 245 ) HTMLNew PDF (1894 KB)  ( 327 )
91 Research on Monitoring Technology of Equipment Processing Based on Digital Twin
FANG Yuan1,2, LIU Jiang2
DOI: 10.16080/j.issn1671-833x.2021.04.091
Aiming at the lack of effective human-computer interaction methods and the low degree of visual monitoring of the real-time running status of the equipment in the production process of typical aviation product assembly production lines, a technical solution for operation status monitoring of processing equipment visualization and simulation analysis of processing equipment based on digital twin theory is proposed. The program includes model construction and optimization, NC program analysis and pre-processing simulation, software and hardware communication and data transmission, real-time data acquisition and simulation functions. Finally, it is verified on the assembly line of the aircraft engine external culvert assembly that the scheme can be used for NC program processing simulation analysis, online monitoring of equipment status during operation online monitoring of production line status information and real-time three-dimensional simulation.
2021 Vol. 64 (4): 91-96 [Abstract] ( 251 ) HTMLNew PDF (2959 KB)  ( 1573 )
97 Accurate Data Extraction Technology for Off-Line Programming of Aircraft Automatic Drilling
LUO Qun, XUE Hong, LIU Bofeng, LIU Siyue, LI Cheng
DOI: 10.16080/j.issn1671-833x.2021.04.097
The current aircraft automatic drill off-line programming has the disadvantage of high degree of manual participation, low efficiency and unable to prevent quality problems. To solve this problem, an offline programming method based on database and defined label is proposed. According to the process characteristics of aircraft automatic drilling, the off-line programming process is established. According to the requirement of offline programming data, the programming database is established. Combined with the database and MBD model, the information extraction rules of fastener, lamination, thickness and process parameters are formulated. The tag based process information expression and equipment attitude control are realized in DELMIA by using the characteristics of attribute feature, direction feature and point feature of label. Finally, the transformation of label in product coordinate system and equipment coordinate system is analyzed, and the correct output of processing program coordinate value is realized.
2021 Vol. 64 (4): 97-102 [Abstract] ( 266 ) HTMLNew PDF (2782 KB)  ( 389 )
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