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2020 Vol. 63, No. 14
Published: 2020-07-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Research Development of Lightweight Technology for CNC Machine Tools
ZHANG Song, LIU Bin, FANG Yujie
DOI: 10.16080/j.issn1671-833x.2020.14.014
With the rapid development of industrial technology, the requirements for machine tools and production systems are mostly focused on energy saving and green development, which brings new challenges to designers of machine tools. Lightweight technology not only saves a lot of materials, but also optimizes the performance of machine structure, which creates favorable conditions for the development of high-performance CNC machine tools. This paper describes the application of lightweight technology in CNC machine tools, discusses the influence of lightweight design method on green cycle manufacturing and its sustainable development of CNC machine tools. It also emphatically analyzes the effective methods and technical means to achieve the goal of lightweight design of CNC machine tools. Finally, it prospects the development prospect of lightweight technology in CNC machine tool design, and puts forward some suggestions.
2020 Vol. 63 (14): 14-22 [Abstract] ( 252 ) HTMLNew PDF (11312 KB)  ( 302 )
       COVER STORY
24 Pulsating Assembly Production Line Planning of Civil Helicopter
YU Jiafa
DOI: 10.16080/j.issn1671-833x.2020.14.024
The aircraft assembly is increasingly developing into a standing, pulsating assembly line. Choice of assembly separation plane is crucial to aircraft assembly station construction. Through the analysis of the characteristics about helicopter assembly process, then we explored the advantages and disadvantages of different structural separation planes, and studied the effect of assembly separation plane for helicopters on the construction of the assembly station, concluded the basic rules and methods for the design of the assembly station production line, and the conclusion provided ideas for helicopter assembly production line construction.
2020 Vol. 63 (14): 24-31 [Abstract] ( 273 ) HTMLNew PDF (3128 KB)  ( 528 )
       FORUM
34 Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems
YANG Yingfei, REN Pan, BAO Zebin,DENG Chunming, LI Wei
DOI: 10.16080/j.issn1671-833x.2020.14.034
In order to investigate the hot corrosion behavior of the commonly-used bond coats for thermal barrier coating system, four typical bond coats (i.e., plain NiAl coating, NiCoCrAlY coating, Pt modified NiAl coating and Pt+Hf co-modified NiAl coating) were comparably evaluated in the mixed salts of Na2SO4/NaCl (mass fraction 75%∶25%) at 900℃. The phase constitution evolution and microstructure change during hot corrosion were analyzed by scanning electron microscope (SEM), electron probe micro-analyzer (EPMA) and X–ray diffractometer (XRD). The results showed that plain NiAl coating degrades fastest during hot corrosion test. In contrast, the degradation rate of NiCoCrAlY coating is slower. The hot corrosion resistance of the two modified NiAl coatings is satisfactory, Pt modified NiAl is the best among the four coatings. It seems that the addition of Hf does not benefit the hot corrosion resistance of Pt–Al coating.
2020 Vol. 63 (14): 34-40/47 [Abstract] ( 159 ) HTMLNew PDF (5143 KB)  ( 775 )
41 Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems
YANG Yingfei, REN Pan, BAO Zebin, DENG Chunming, LI Wei
DOI: 10.16080/j.issn1671-833x.2020.14.041
In order to investigate the hot corrosion behavior of the commonly-used bond coats for thermal barrier coating system, four typical bond coats (i.e., plain NiAl coating, NiCoCrAlY coating, Pt modified NiAl coating and Pt+Hf co-modified NiAl coating) were comparably evaluated in the mixed salts of Na2SO4/NaCl (mass fraction 75%∶25%) at 900℃. The phase constitution evolution and microstructure change during hot corrosion were analyzed by scanning electron microscope (SEM), electron probe micro-analyzer (EPMA) and X–ray diffractometer (XRD). The results showed that plain NiAl coating degrades fastest during hot corrosion test. In contrast, the degradation rate of NiCoCrAlY coating is slower. The hot corrosion resistance of the two modified NiAl coatings is satisfactory, Pt modified NiAl is the best among the four coatings. It seems that the addition of Hf does not benefit the hot corrosion resistance of Pt–Al coating.
2020 Vol. 63 (14): 41-47 [Abstract] ( 152 ) HTMLNew PDF (6843 KB)  ( 73 )
48 Research Progress of Ceramic Matrix Composites and Their Environmental Barrier Coatings
JIANG Zhou, NI Jianyang, ZHANG Xiaofeng, HE Bing, WANG Chao, DONG Lin, DENG Chunming, DENG Changguang, LIU Min
DOI: 10.16080/j.issn1671-833x.2020.14.048
Ceramic matrix composite (CMC) has a series of superior properties such as high temperature resistance, low density, oxidation resistance, corrosion resistance, and wear resistance, and is regarded as the first choice material for the new generation of high thrust-to-weight ratio aero-engine high temperature components. In the application environment, CMC has problems such as insufficient resistance to water vapor oxidation. It needs to be in service for a long time under the protection of environmental barrier coatings (EBCs). First, this article introduces the overall development status of ceramic matrix composites and environmental barrier coatings; Second, it discusses ceramic matrix composites and environmental barrier coatings in detail. The research progress and application of ceramic matrix, fiber, interfacial layer and ceramic matrix composites materials are reviewed as well as new research results of scholars at home and abroad in recent years. At the same time, the research progress and preparation methods of environmental barrier coatings are introduced, and the research progress of its failure mechanism is reviewed. The article summarizes the current problems of ceramic matrix composites and environmental barrier coatings as well as prospects for future research.
2020 Vol. 63 (14): 48-64 [Abstract] ( 215 ) HTMLNew PDF (2516 KB)  ( 1721 )
65 EB–PVD Thermal Barrier Coatings Process Optimization and Antioxidant Performance
WANG Bo, LIU Yang,YUAN Fuhe,CHENG Yuxian, ZHANG Chungang
DOI: 10.16080/j.issn1671-833x.2020.14.065
The effects of substrate preheating temperature, flow rate and time of filling oxygen on the thermal shock and oxidation resistance at 1150℃ of an YSZ thermal barrier coatings prepared by EB–PVD were studied by means of an orthogonal test. Thethermal shock cycle number of the coating increases to a maximal value as the substrate preheating temperature rises up to a temperature of 900℃. Nonetheless, it decreases as the preheating temperature further rises. Meanwhile, the thermal shock resistance of the YSZ coating increases with the filling oxygen flow rate and filling time, and it becomes approximately constant with the flow rate and filling time fall over a certain range of values. The optimized process parameters for the EB–PVD YSZ coating involve 900℃ of substrate preheating temperature, 200mL/min of oxygen flow rate and 15min of oxygen filling time.
2020 Vol. 63 (14): 65-72 [Abstract] ( 201 ) HTMLNew PDF (12105 KB)  ( 161 )
       APPROACHING SCIENCE
74 Explore Nature of Material Corrosion and Abrasion for National Major Project Construction
2020 Vol. 63 (14): 74-75 [Abstract] ( 121 ) HTMLNew PDF (1617 KB)  ( 79 )
       RESEARCH
76 Research on Servo Sealant Applying Method for Fastener Hole
ZHANG Yilian,FAN Yunfei
DOI: 10.16080/j.issn1671-833x.2020.14.076
High viscosity sealant is widely used in the field of aviation, because of its poor liquidity and high viscosity, it is difficult to realize automatic sealant applying. Especially for sealant applying on fastener holes, the sealant dosage is strictly controlled. Automatic pneumatic sealant is widely used in the field of automatic drilling and riveting, but the sealant dosage can not be controlled accurately and constantly. So the research on automatic precision sealant applying is necessary. This paper proposed a new method of using servo driving cylinder for sealant applying. It is found that compared with pneumatic control, servo control can guarantee sealant application quantity stably and accurately, and the advantage can be maintained in a certain period of time.
2020 Vol. 63 (14): 76-81 [Abstract] ( 181 ) HTMLNew PDF (10201 KB)  ( 190 )
82 Research on Numerical Control Milling Efficiency Evaluation and Control of Aeronautical Manufacturing
ZHOU Jia, ZENG Guwei
DOI: 10.16080/j.issn1671-833x.2020.14.082
Aiming at improving CNC milling efficiency of discrete aeronautical manufacturing enterprises by using Six Sigma tools and methods and integrating the core idea of international overall equipment efficiency (OEE), and the sample of aluminum alloy parts produced in an aviation enterprise is statistically analyzed based on VERICUT simulation software. Besides, several common problems of inefficient programs are identified. By introducing the concept of efficiency baseline, the project finds a considerable way to control the key factors such as material removal rate (MRR), surface machining rate (SMR), empty knife rate, etc. Finally, a numerical control milling efficiency evaluation method and program control ideas are proposed, which can be used to control the efficiency of the program effectively by preventing the inefficient programs from flowing into the production line, and a lot of time waste, and labor cost can be reduced. As a consequence, the delivery rate of the digital production enterprise can be improved dramatically, and the core competitiveness of the company will be enhanced.
2020 Vol. 63 (14): 82-101 [Abstract] ( 267 ) HTMLNew PDF (2250 KB)  ( 350 )
93 Function Architecture of Intelligent Factory for Multi-Varieties and Variable-Batch Products
YU Chenglong,HOU Junjie,LU Jing,ZHANG Wei,PU Hongbo,GUO Xukai
DOI: 10.16080/j.issn1671-833x.2020.14.093
To promote the research, planning and application of intelligent factory for products with multi variety and variable batch characteristics, driven by the basic business process of the factory, the function architecture of intelligent factory is studied. The system architecture of the factory is put forward, and the concept, connotation and the main contents such as collaborative design, intelligent production, test verification and intelligent control are discussed. Furthermore, the key techniques such as intelligent conversion of model, automatic acquisition and analysis of data in the development process are studied. It is certain reference value for the subsequent plant design and construction of the intelligent factory.
2020 Vol. 63 (14): 93-101 [Abstract] ( 216 ) HTMLNew PDF (1393 KB)  ( 487 )
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· 'Aeronautical Manufacturing technology ' is included in EI database
· China Science Citation Database (CSCD)
· Chinese S&T Journal Citation Reports (CJCR)
· World Journal Clout Index (WJCI) Report of Scientific and Technological Periodicals
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· Aeronautical Manufacturing Technology ranked No. 3 in Chinese S&T Journal Citation Reports (CJCR)
· High Quality Sci-tech Journal Classification Catalogue in Aerospace Field （2023）
· A Guide to the Core Journals of China (hosted by Peking University Library)
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