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2021 Vol. 64, No. 6
Published: 2021-03-15
FEATURE
FORUM
RESEARCH
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Linking Method for Additive Manufacturing of Lattice Structure Components
ZHOU Bo, LIU Dianhai, ZHAO Yuhui, TIAN Tongtong, ZHAO Jibin
DOI: 10.16080/j.issn1671-833x.2021.06.014
This paper aims to improve the processing efficiency of lattice structural components additive manufacturing. After the lattice structure is layered and sliced, each layer will generate a large number of polygons to be filled. By abstracting these polygons into discrete points, solving the traveling salesman problem at the slice level, carrying out the planning of the connection path, a highly efficient dot matrix model filling path is obtained. The algorithm takes into account the calculation efficiency of the traveling salesman problem and the total length of the calculation of the connection path: the ant colony algorithm is used to obtain a cross-connected trajectory. The calculation of the connection plan of 2000 points takes less than 3.5s and the total path length only increases by 0.2% compared to the international advanced algorithm. When some abstract points are too far apart, the abstract point set is divided into subsets by distance clustering, and then the path planning is performed separately. Simulation and experimental verification results show that this method can obtain an efficient non-cross-connection path, effectively reducing the total length of the connection path and the processing time: the total printing time is reduced by 17.52% and the total connection length is reduced by 17.38%, meeting the actual additive manufacturing needs.
2021 Vol. 64 (6): 14-23 [Abstract] ( 124 ) HTMLNew PDF (27316 KB)  ( 120 )
       COVER STORY
24 Research on Establishment and Key Techniques of Aircraft Assembling Geometric Measurement System
XING Yixin
DOI: 10.16080/j.issn1671-833x.2021.06.024
The assembling of the new generation aircraft is characterized by high precision, high efficiency and high reliability. By considering the characteristics, the demands of geometric measurement during assembling are analyzed and the measurement system is established. Three key techniques are accomplished. The first one is multi-source heterogeneous whole-body measurement process simulation and accuracy optimization technique. The second one is 3D point cloud data fitting and aligning technique. The third one is multi-system collaboration and cross-scale measurement technique based on whole-body measurement field. The aircraft assembling quality management platform is then developed. The measurement data management informatization is also achieved. The techniques and measurement system will offer data support for the following assembly work and improve the quality controllability of assembling process.
2021 Vol. 64 (6): 24-31 [Abstract] ( 218 ) HTMLNew PDF (1166 KB)  ( 686 )
       FORUM
34 Research on Real-Time Relative Pose Measurement Method of Large-Scale Components Based on Vision
DU Fuzhou, YE Hanming
DOI: 10.16080/j.issn1671-833x.2021.06.034
Relative pose is an important monitoring item in the assembly process. Aiming at the relative pose measurement requirements during the docking of large-scale components, a vision-based real-time measurement method of relative pose is proposed. Based on the monocular vision technology, relative poses of sections is calculated in real time with the images of cooperative targets, which can be useful for the assembly work. Firstly, a real-time relative pose measurement system is designed, including a vision measurement unit equipped with a monocular camera, and a cooperative target for pose calculation. Secondly, the complete process of relative pose measurement is studied, including system calibration method and real-time pose calculation method. Finally, the accuracy of the pose measurement system is tested in laboratory. The result shows that the repeatability of the pose measurement system perpendicular to the optical axis can reach 0.02mm, the repeatability along the optical axis is better than 0.2mm, and the time of pose measurement is less than 0.3s. The network measurement of multi-measuring unit is simulated, and the repeatability perpendicular to the optical axis is better than 0.1mm, the repeatability along the optical axis is better than 0.2mm, and the time of pose measurenent is less than 1.3s, which satisfies the requirement of pose monitor and docking state estimation for large-scale component docking.
2021 Vol. 64 (6): 34-40/47 [Abstract] ( 159 ) HTMLNew PDF (1691 KB)  ( 682 )
41 Study on Tool Setting Method of Micro-Milling Tool Based on in-Line Holography
ZHANG Xianghui, XU Jinkai, YU Zhanjiang, CHENG Yaya, YU Huadong
DOI: 10.16080/j.issn1671-833x.2021.06.041
In view of the shortcomings of the existing tool setting methods, we proposed a new method of tool setting for micro-milling tools based on in-line holographic imaging. After researching and analyzing the holographic imaging principle and key problems of holographic image, a set of digital holographic tool setting prototype was built, and the micro-milling tools was measured on a five-axis machining center using a standard tool. The experimental results show that, the holographic tool setting prototype can effectively realize the detection of micro-milling tools, and the relative accuracy of this instrument is 5.1μm. Under the same detection conditions, compared with the measurement results of a high-precision external presetter, the relative error of the tool setting instrument is 0.033%, while the relative error of the holographic tool setting prototype is 0.007%, and it can effectively realize the detection of micro-milling tool. This results verify that holographic imaging method can be used for the high-precision tool setting of micro-milling tools.
2021 Vol. 64 (6): 41-47 [Abstract] ( 96 ) HTMLNew PDF (8511 KB)  ( 132 )
48 Research on Radial Dynamic Performance of Air Bearing Support Stylus Measuring System
WU Yunquan, CHANG Suping, WU Hao
DOI: 10.16080/j.issn1671-833x.2021.06.048
The stylus surface topography measuring instrument is widely used in production and scientific research. Because of its structure, the lever stylus will produce nonlinear error in measurement, which will affect the accuracy of measurement results. This paper introduces a kind of air bearing stylus measuring sensor. The movement direction of the stylus axis is consistent with the displacement measurement direction, which effectively avoids the nonlinear error. In the research, the movement model of the air bearing stylus measuring system is established, the dynamic and static characteristics of the measuring system are analyzed, the factors affecting the radial dynamic performance of the air bearing support are studied, the theoretical simulation of radial stiffness and dynamic parameters is carried out, and the maximum scanning frequency of the sensor is 125Hz through the dynamic characteristic test and analysis; the air bearing stylus surface topography measurement system is built and the measurement experiment is carried out, and the relative error of the sensor measurement is 0.8%.
2021 Vol. 64 (6): 48-54/62 [Abstract] ( 95 ) HTMLNew PDF (9560 KB)  ( 109 )
55 Boundary Extraction of Defect Hole of Aero-Engine Blades Based on Double Decision Criteria
LI Jingjun,RUI Zhiyuan,YAN Changfeng,WANG Wenbin,WEI Caibin
DOI: 10.16080/j.issn1671-833x.2021.06.055
Due to the complex geometry, scattered position distribution, and obvious curvature change of the defect holes in aero-engine blades, it is difficult to extract the boundary feature points completely by using a single criterion. To realize the accurate boundary extraction of blade defect holes and smooth fitting of the holes boundary line, an algorithm for extracting boundary feature points of aero-engine blade defect holes based on double criteria was proposed. The fitting plane was established based on the spatial topological structure of the sampling point and its K neighborhood points, which transformed the three–dimensional coordinates into two–dimensional coordinates by the local coordinate system. By fusing the criterion of the normal angle of sampling points with the adjacent field power force criterion, the eigenvalue and discrimination threshold of sampling points are obtained by the weighted method, which can be used as the criterion for extracting boundary feature points. The validity and accuracy of the algorithm were verified by two sets of experiments, the experimental results demonstrate that the method can effectively extract the boundary feature points in complex holes model.
2021 Vol. 64 (6): 55-62 [Abstract] ( 107 ) HTMLNew PDF (2340 KB)  ( 449 )
       APPROACHING SCIENCE
64  Facing National Major Strategic Needs, Focus on High-Performance Surface Precision Machining
2021 Vol. 64 (6): 64-65 [Abstract] ( 64 ) HTMLNew PDF (387 KB)  ( 88 )
       RESEARCH
66 A Frictional Contact MEMS Inertial Switch Based on Micro Electroforming Technology
DU Liqun, YANG Xiaochen,YU Yang,WANG Shengyi,LIU Pengbo,ZHAO Jian
DOI: 10.16080/j.issn1671-833x.2021.06.066
This paper presents a frictional contact MEMS inertial switch to solve the problem of short contact duration and bounce effect of inertial switch. The closing principle of the switch was theoretically analyzed and modeled. A method of enhancing the contact effect by frictional contact was proposed and the switch was designed based on that method. In order to compare the contact performance between frictional contact MEMS inertial switch and other switches, three kinds of inertia switches were fabricated by using UV-LIGA multilayer photolithography and precision micro electroforming. Finally, switches were tested by a standard dropping hammer system and the contact duration of the three switches were obtained. The tested results show that the contact duration of rigid, flexible and frictional contact MEMS inertial switches is 10μs, 80μs and 620μs respectively when applied 400g external acceleration. Both rigid and flexible contact MEMS switches have contact bounce, while frictional contact switches close stably without bounce. The frictional contact MEMS inertial switch has great advantages in enhancing the contact effect.
2021 Vol. 64 (6): 66-72/81 [Abstract] ( 85 ) HTMLNew PDF (7856 KB)  ( 117 )
73 Optimization of Process Parameters of Minimum Quantity Lubrication System Based on Grey Relation Analysis
KONG Xiaoyao, YUAN Songmei, ZHU Guangyuan, ZHANG Wenjie
DOI: 10.16080/j.issn1671-833x.2021.06.073
In order to solve the problem of parameter optimization of minimum quantity lubrication (MQL) system in titanium alloy milling, Taguchi method was used. With air flow rate, cutting fluid usage and cutting fluid concentration as variables, surface roughness Ra and cutting force as evaluation indexes, the MQL milling test of titanium alloy was carried out. Multi-objective optimization of minimum quantity lubrication system parameters was carried out using grey relation analysis and principal component analysis method. By analyzing the influence of various factors on grey relation grade, the optimal combination of system parameters was determined to be air flow rate of 90L/min, cutting fluid usage of 15mL/h and cutting fluid concentration of 70%. The optimized process parameters can effectively improve the surface quality of the workpiece and reduce the cutting force, which provides a reference for the reasonable selection of parameters of MQL system.
2021 Vol. 64 (6): 73-81 [Abstract] ( 117 ) HTMLNew PDF (1378 KB)  ( 238 )
82 Research Progress of Fine Particle Peening Technology
LI Ruizhi,ZHOU Xianglin,SUN Chengchuan,XIE Chen,WEN Wei
DOI: 10.16080/j.issn1671-833x.2021.06.082
Fine particle peening has become an important surface strengthening technology in the field of aviation, energy etc. because it can reduce the surface roughness while strengthening the surface of substrate due to the used small size medium. So far, the research on this technology has been still in the stage of experimental demonstration of its strengthening mechanism, and complete theoretical system has not been established yet. This article summarizes the principles, characteristics of fine particle peening technology and discusses the strengthening mechanism in the process of fine particle peening. The current research status of fine particle peening technology and its application in various materials are described. It also points out the potential application of this technology and studying the effects of various parameters on the shot peening effect will be the main direction of development of fine particle peening.
2021 Vol. 64 (6): 82-87/95 [Abstract] ( 165 ) HTMLNew PDF (1882 KB)  ( 416 )
88 Cutting Force and Surface Quality Research on Ultrasonic Cutting of Nomex Honeycomb Core With Disc Cutter
MENG Qian, WANG Yidan, DONG Zhigang, KANG Renke
DOI: 10.16080/j.issn1671-833x.2021.06.088
In order to study the effect of processing parameters on cutting force and surface quality, the cutting forces in ultrasonic cutting and conventional cutting were theoretically analyzed. On this basis, ultrasonic cutting tests of Nomex honeycomb core with disc cutter were conducted to obtain the influence of the feeding speed, rotating speed and ultrasonic amplitude on cutting force. Further, the number and length of tearing defect were selected as characterization parameters of surface quality and the influence of processing parameters on the surface quality of honeycomb core were quantitatively studied. The test results show that the cutting forces decrease with the increase of rotating speed and the decrease of feeding speed in conventional cutting. As the ultrasonic amplitude increases, the cutting forces decrease significantly. Compared with the conventional cutting, the cutting forces in feeding direction and axis direction of cutter are separately reduced by 53.1% and 33.9% when the ultrasonic amplitude increases to 35μm. The test results of cutting force are consistent with the theoretical analysis. In addition, the number of tearing defects of Nomex honeycomb core decreases with the increase of rotating speed and the decrease of the feeding speed, and the number and length of tearing defects are simultaneously improved in ultrasonic cutting. The conclusions provide guidance for selection of processing parameters in ultrasonic cutting of Nomex honeycomb core.
2021 Vol. 64 (6): 88-95 [Abstract] ( 117 ) HTMLNew PDF (6730 KB)  ( 407 )
96 Effect of Damaged and Repaired Notch on Vibration Fatigue Property of TC17 Titanium Alloy Simulated Blades
HU Yuhao, TIAN Wei, LIU Yanfei，ZHONG Yan
DOI: 10.16080/j.issn1671-833x.2021.06.096
The effects of smooth (non-damaged), damaged and three kinds of polishing repaired notch structure on the vibration fatigue properties of TC17 titanium alloy simulated blades are investigated. The results show that smooth simulated blades exhibit the longest fatigue life and smallest life data dispersion, while the fatigue life of simulated blades with damaged notch are the smallest and the dispersion are the largest. The fatigue life increases when the damaged notch is repaired by polishing, the fatigue life of the blades with repaired notch Ⅰ is the largest, but still less than the life of smooth blades. The fatigue cracks in both smooth and repaired blades initiate at blade roots, while in the damaged blades fatigue crack are found at the notch. The crack sites are consistent with the largest stress sites in FEM results. The fatigue fracture regions of simulated blades are flat, in half ellipse morphology. The crack initiations mostly derive from the surface tiny damage. Fatigue propagation regions are characterized by typical fatigue beaches, present the character that cracked along the interface of α / β lamellar microstructure.
2021 Vol. 64 (6): 96-101 [Abstract] ( 105 ) HTMLNew PDF (14758 KB)  ( 91 )
  Notices
· '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
· Supported in China Science and Technology Journal Excellence Action Plan
· 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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