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2021 Vol. 64, No. 3
Published: 2021-02-01
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Ultra-Precision Polishing Method for Large Free-Form Surface Optics
ZHOU Bo, LI Lun, TIAN Tongtong, ZHAO Jibin
DOI: 10.16080/j.issn1671-833x.2021.03.014
This paper aims to improve the precision and efficiency of precision polishing technology for large-scale free-form surface optical devices. By constructing a robotic polishing center as a polishing platform, the travelling salesman problem is solved in a planar mapping domain including unit circle domain, unit square domain and free boundary domain. For the quotient problem, the circularity value is calculated by projection, the mapping area is classified, and the obtained planar trajectory is mapped to the curved surface to obtain the polishing path for the ultra-precision optical device with large-scale freedom. The algorithm in this paper takes into account the calculation efficiency and boundary coverage quality. When the circularity of the projection area exceeds 0.9, the unit circle domain is used as the mapping plane domain. when the circularity value of the projection area is relatively small, between 0.8 and 0.9, the unit square domain is used as the mapping plane domain. When the circularity value is less than 0.8, the free boundary mapping domain is adopted. Simulation and experimental verification of polishing results show that this method can obtain an efficient non-crossing path, effectively reduce the intermediate frequency and high frequency errors caused by a single direction operation, meet the actual polishing processing requirements of changing direction of the polishing path, effectively eliminate the polishing texture, and significantly improve the polishing accuracy and efficiency.
2021 Vol. 64 (3): 14-21 [Abstract] ( 133 ) HTMLNew PDF (20485 KB)  ( 102 )
       COVER STORY
22 Review: Data Processing and Process Planning of Metal Additive Manufacturing
ZHANG Lichao, HU Qi, WANG Senlin, ZHANG Nan, SHI Yusheng
DOI: 10.16080/j.issn1671-833x.2021.03.022
Metal additive manufacturing data processing and process planning are the core of metal additive manufacturing software system, covering metal support design, model slicing and path planning, etc. and determine the product performance of the final metal parts. Starting from the model pre-processing of the metal additive manufacturing, a more comprehensive overview of the related data processing content such as multi-type support design and novel support optimization is summarized. With regard to the model slicing, a critical part of the data processing in metal additive manufacturing, the research progress is reviewed from the aspects of normal slicing, adaptive slicing and surface slicing. The path planning in metal additive manufacturing process is also reviewed. Finally, the development trend of data processing and process planning in metal AM software is preliminary proposed.
2021 Vol. 64 (3): 22-31 [Abstract] ( 185 ) HTMLNew PDF (17765 KB)  ( 364 )
       FORUM
34 Applications of Metal Additive Manufacturing Technology in Maintenance and Support for Military Aircraft
PAN Xin, ZHANG Yingwei, LIU Yanmei, MAO Jianfeng, WANG Jing, YIN Jun
DOI: 10.16080/j.issn1671-833x.2021.03.034
The development of metal additive manufacturing technology provides a new way on the research of digitization, personalized customization, high-performance and short period for the maintenance and support of military aircraft, which can improve the technical level and ability of military aircraft maintenance and support. In this paper, the current situation of military aircraft maintenance and support at home and abroad is summarized and the application advantages of metal additive manufacturing technology are pointed out. The typical damage forms of military aircraft parts, the applicability of different additive manufacturing processes and the selection scheme of repair process are introduced and the key technologies such as reverse modeling, structural optimization and intelligent robot are analyzed. The main problems as well as the solutions of low technology maturity and reliability, unclear repair principle and inconsistent standards and specifications are described in detail. The paper also points out the future development direction and trend of additive manufacturing technology in the field of military aircraft maintenance and support and gives specific application suggestions.
2021 Vol. 64 (3): 34-43 [Abstract] ( 165 ) HTMLNew PDF (2667 KB)  ( 825 )
44 Research Progress in Defect and Microstructure of As-Built Selective Laser Melting Ti–6Al–4V Titanium Alloy
LI Chen,MI Guangbao,FENG Aihan,HUANG Xu,QU Shoujiang
DOI: 10.16080/j.issn1671-833x.2021.03.044
Selective laser melting (SLM) has been widely used in production of titanium alloy parts in recent years, but its performance is limited by process defects and martensite microstructure. The research progress of defects and microstructure of as-built SLM–Ti–6Al–4V was summarized, including defects types and microstructure types, the effect of adjusting process parameters on reducing defect and regulating microstructure, and the β→α phase transformation research based on variant selection. Based on the main research mentioned above, improving the relationship between process parameters and microstructure characteristics and studing the influence of process parameters on phase transformation variant selection will be the focused directions in the further research.
2021 Vol. 64 (3): 44-51 [Abstract] ( 141 ) HTMLNew PDF (31349 KB)  ( 108 )
52 Research Progress in TiAl Alloys Prepared by Powder Selective Electron Beam Melting
CHE Qianying,LI Huixia,HE Weiwei, ZHU Jilei, CHEN Rui,CHENG Kangkang,JIN Yuanyuan,WANG Yu
DOI: 10.16080/j.issn1671-833x.2021.03.052
Powder selective electron beam melting is an ideal additive manufacturing technology for the fabrication of brittle TiAl alloy complex components. In this paper, the research progress in TiAl alloys prepared by selective electron beam melting are reviewed from the aspects of raw material powder, densification, chemical composition, microstructure, solidification and phase change, post-processing, mechanical performance, forming accuracy and surface roughness. The problems existing in the research and the corresponding measures are remarked, and the future development strategies are prospected.
2021 Vol. 64 (3): 52-60/67 [Abstract] ( 145 ) HTMLNew PDF (4841 KB)  ( 1436 )
61 Microstructural Evolution and Mechanical Property of TiB2 Nanoparticles Reinforced AlSi5 Alloy in Wire and Arc Additive Manufacturing
JIN Peng, REN Huisheng,LIU Yibo, LI Junzhao, LI Fuxiang, SUN Qingjie
DOI: 10.16080/j.issn1671-833x.2021.03.061
In the process of arc additive manufacturing, aluminum alloy is easy to cause inhomogeneous microstructure distribution and solute segregation due to continuous heat accumulation, leading to its anisotropic properties. In order to solve this problem, the tungsten inert gas (TIG) additive manufacturing process with addition of TiB2 nanoparticles was designed. In the process of wire and arc additive manufacturing, TiB2 nanoparticles were added to the deposition samples by surface pre-coating. The effects of different mass fraction of TiB2 nanoparticles on the microstructure of AlSi5 alloy were compared and studied. The results show that the microstructure inhomogeneity of AlSi5 aluminum alloy was obviously improved with the mass fraction of TiB2 increased. The grain size decreased from 226μm to 85.6μm with the addition of 1.5% TiB2, and the texture on (110) and (112) basal planes decreased obviously, besides the maximum orientation density was decreased. The hardness and elastic modulus of the deposited layer were significantly improved with addition of TiB2 nanoparticles. The value of hardness increased from 879MPa to 1253MPa, and the elastic modulus increased from 81.9GPa to 88.3GPa.
2021 Vol. 64 (3): 61-67 [Abstract] ( 137 ) HTMLNew PDF (37720 KB)  ( 301 )
       APPROACHING SCIENCE
68 Based on Major Applications in Aerospace, Committed to Efficient Precision Manufacturing and Equipment Breakthrough
2021 Vol. 64 (3): 68-69 [Abstract] ( 101 ) HTMLNew PDF (680 KB)  ( 73 )
       RESEARCH
70 Development of Online View System Based on Backscattered Electrons for Electron Beam Processing
ZHANG Hongyu,XU Haiying, LU Kaitong, ZUO Congjin
DOI: 10.16080/j.issn1671-833x.2021.03.070
In order to obtain a clear view of electron beam processing, an online view system was developed based on backscattered electrons with four-plate backscattered electron sensor, high-frequency signal amplification circuit, highfrequency data acquisition card, and high-frequency deflection and scanning system. The experiments indicate that the system can effectively observe the workpiece in the area of 100mm×100mm, the resolution is 512 pixels×512 pixels, and the frames of image processing can reach 6 frames/second.
2021 Vol. 64 (3): 70-75 [Abstract] ( 100 ) HTMLNew PDF (3412 KB)  ( 256 )
76 A Mobile Robot Autonomous Tracking Method for Aircraft Skin Seam
WANG Wenhui, HUANG Xiang, MENG Yayun, LU Xiaoxiang, LI Gen
DOI: 10.16080/j.issn1671-833x.2021.03.076
In order to solve the problem of automatically measuring the assembly seams on large skins surface, a mobile robot autonomous tracking method for aircraft skin seam is proposed. The mobile robot includes a seam measurement module and a motion control module. The seam measurement module obtains the posture of the robot relative to the seam while measuring the gap and flush. The motion control module controls the robot to adjust position automatically. Based on the relative position between the dual linear structured light and the seam, an autonomous robot position adjustment method in different situations is proposed, which could solve the problem of autonomous position adjustment when the robot deviated from the seam. The experimental results show that the position error of the mobile robot for the autonomous tracking of the seam is 5.81mm and the angle error is 3.52°
2021 Vol. 64 (3): 76-82 [Abstract] ( 169 ) HTMLNew PDF (1893 KB)  ( 266 )
83 Research on Evaluating Method of Assembly Capacity of Large Aircraft Component
LONG Anlin, HE Fengtao, JIANG Chao, CHEN Aimin, LIU Dapeng
DOI: 10.16080/j.issn1671-833x.2021.03.083
In order to evaluate the assembly capacity of large aircraft component which has typical characteristics of the discrete manufacturing, the sub-components are selected as research objects. Dynamic effects of the factors including process scheme, operational proficiency, work shift model, manufacturing resource and main manufacturer-supplier model on sub-components assembly capacity have been analyzed in advance. Based on the data set of sub-components assembly capacity, the evaluating method of actual assembly capacity of large aircraft component has been proposed. Sequential relationship of assembly process and matched degree of each sub-components assembly capacity are taken into consideration. That method is proven to be feasible and effective via an assembly demonstration.
2021 Vol. 64 (3): 83-86/102 [Abstract] ( 156 ) HTMLNew PDF (1101 KB)  ( 388 )
87 Study on Application of Digital Twin Workshop in Assembly Process of Complex Products
HU Xiukun, ZHANG Lianxin
DOI: 10.16080/j.issn1671-833x.2021.03.087
The digital twin workshop (DTW) uses digital twin technology as the core, which could effectively solve the bottleneck of the physical-cyberspace fusion in workshop. The characteristics of the current complex products assembly process are summarized, the concept of as-built assembly model, as well as the framework of the DTW for complex products assembly including physical entity layer, model data layer, iterative analysis layer, and collaborative service layer, are proposed. The regulating method of assembly process with assembly modified model as the core and the operation mechanism of assembly DTW are studied. On this basis, the contribution of the DTW to the efficiency promotion of the assembly process is analyzed, and a new idea for improving the complex products assembly workshop is provided.
2021 Vol. 64 (3): 87-96 [Abstract] ( 215 ) HTMLNew PDF (1496 KB)  ( 907 )
97 Influence of Heat Treatment on Mechanical Properties of TA15 Titanium Alloy Fabricated by Laser Additive Manufacturing
GU Meibang
DOI: 10.16080/j.issn1671-833x.2021.03.097
This paper focused on studying the microstructure and mechanical properties of TA15 titanium alloy fabricated by laser additive manufacturing after normal annealing treatment and double anealing treatment. The results indicate that TA15 alloy has a super fine basketweave microstructure after normal annealing treatment, and which will change to a bi-modal microstructure with a crab-like primary α phase with super fine transformed β phase after double annealing treatment. The ultimate strength, yield strength and fatigue limit of the alloy after normal annealing heat treatment are better than the alloy’s after double annealing treatment. But the plasticity and fracture toughness of the alloy after double annealing treatment are superior to those of the alloy after normal annealing heat treatment
2021 Vol. 64 (3): 97-102 [Abstract] ( 167 ) HTMLNew PDF (10540 KB)  ( 91 )
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· 'Aeronautical Manufacturing technology ' is included in EI database
· China Science Citation Database (CSCD)
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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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