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2020 Vol. 63, No. 21
Published: 2020-11-01
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Effect of Welding Standoff Distance on Microstructure and Mechanical Properties of Magnetic Pulse Spot Welding Joints of Aluminum Alloy Sheet
LIU Quanxiaoxiao, ZHU Jiapei, CUI Junjia
DOI: 10.16080/j.issn1671-833x.2020.21.014
Welding is a vital process of the aircraft manufacturing, and the reliability of welding structure largely depends on the performance of welded joints. Aluminum alloy, as an important lightweight aerial material, has an important impact on the development of aviation industry. Magnetic pulse spot welding for connection of aluminum alloy thin plates was proposed to realize solid-phase welding of aluminum alloy plates. The influence of process parameters on the welding quality of aluminum alloy spot welded joints was studied by changing the welding standoff distance. Photonic Doppler velocimetry (PDV) was used to obtain the information of the flying plate during deformation processes. The mechanical properties of the joint were evaluated by quasi-static shear tensile test. The microstructure of welded joint was analyzed by optical microscope, polarizing microscope and scanning electron microscope (SEM). The results show that when the welding standoff distance increases from 0.9mm to 1.5mm, the speed of the flying plate and the welding length of the spot-welded joint both increase accordingly, which has a positive effect on the increase of welding length and the performance of spot-welded joints. After comprehensive analysis, it is concluded that 1.2mm welding standoff distance provides a suitable collision velocity for welding parts, and the mechanical performance is the best.
2020 Vol. 63 (21): 14-20 [Abstract] ( 192 ) HTMLNew PDF (3339 KB)  ( 335 )
       COVER STORY
22 Research Progress on Joining of Lightweight Sheet and Tube by Plastic Deformation
WANG Pengyi,JIN Jiageng,WAN Gehui,ZHANG Changsong,ZHAO Xueni,WANG Zhongjin
DOI: 10.16080/j.issn1671-833x.2020.21.022
In lightweight design, the demand for connecting components of different kinds of materials is increasing, which challenges the traditional joining technology. Joining by plastic deformation is a kind of forming technology which realizes the connection between materials through plastic deformation. Because of its characteristics of high efficiency, environment-friendly and stable connection, it has become one of the hot spots in the academic and engineering circles at home and abroad in recent years. In this paper, the new methods of joining by plastic deformation of sheets, sheet/tube and tubes in recent years are reviewed. The principles, characteristics and potential applications of different methods of plastic connection are analyzed. The development trend of joining by plastic deformation between sheets and tubes is discussed and prospected.
2020 Vol. 63 (21): 22-33 [Abstract] ( 163 ) HTMLNew PDF (6610 KB)  ( 1308 )
       FORUM
36 A Review of Plastic Forming Technologies and Applications for Large and Complex-Shaped Panels
LI Yong, LI Dongsheng, LI Xiaoqiang
DOI: 10.16080/j.issn1671-833x.2020.21.036
Plastic forming technologies are the key technologies for the manufacturing of large and thin-walled components with high accuracy for the aerospace industry. With the continuous development of the new generation of lightweight and high-performance aerospace equipment in the direction of the overall high-precision, lightweight, high-performance, complex thin-walled, etc., it also promotes the continuous innovation of the corresponding plastic forming technologies. Therefore, this paper gives a review of the existing research results and applications, and future development trends of typical plastic forming technologies for thin-walled components in the aerospace industry (including: stretch forming, shot peening, creep aging forming, and superplastic forming/diffusion bonding technology), trying to provide reference and ideas for the future development of research and engineering applications of the plastic forming technologies for large-scale thin-walled components in aviation.
2020 Vol. 63 (21): 36-45/53 [Abstract] ( 184 ) HTMLNew PDF (2986 KB)  ( 613 )
46 Research Status of Spinning Forming for Ni-Based Superalloy
XIAO Gangfeng, XIA Qinxiang, ZHANG Yilong, JIANG Peng
DOI: 10.16080/j.issn1671-833x.2020.21.046
Ni-based superalloy components with thin-walled are the core parts of high-end equipment. Spinning is the most effective method to manufacture these parts with high accuracy and excellent performance. The spinning technology of Ni-based superalloy was comprehensive discussed by analyzing the spinnability, macro-forming quality, microstructural evolution and shape/property integrated control. The influences of initial microstructure of the blank and the forming temperature on the spinnability during flow forming process were analyzed. The influences of the process parameters on macro-forming quality of spun parts were summarized. The microstructural evolution mechanisms during flow forming at room temperature and hot flow forming were discussed. The integrated control method of shape/property of spun parts during hot flow forming was explored.
2020 Vol. 63 (21): 46-53 [Abstract] ( 145 ) HTMLNew PDF (3632 KB)  ( 368 )
54 Simulation Research on Effect of Mandrel Filling on Section Distortion and Wall Thickness Reduction of Rotary-Draw Bending of Copper-Titanium Composite Tube
ZHU Yingxia, WANG Yun, WAN Miaomiao, SHI Wei, TU Wenbin
DOI: 10.16080/j.issn1671-833x.2020.21.054
In order to improve the precision of rotary-draw bending of copper-titanium composite tube, the effects of rigid mandrel parameters on section distortion and wall thickness thinning of the composite tube were studied, based on the established finite element model. The effects of rigid mandrel were compared with that of elastic mandrel. Research results show that: (1) with the increase of the extension amount of the rigid mandrel, the section distortion rate of the base\ covered tube of the bimetallic composite tube decreases gradually, and the wall thickness reduction rate increases gradually. The optimal extension amount of the mandrel is 7mm. (2) Compared with the coreless filling, the section distortion significantly reduces with the rigid mandrel filling, but the wall thickness thinning rate increases. When controlling the section distortion, the influence of the mandrel on the thinning rate of the composite tube should be considered, and the filling condition should be selected flexibly according to the actual production requirements and the tube size and structure. (3) When the elastic mandrel is filled, the section distortion rate along the bending direction is more uniform than that of the rigid mandrel. Compared with the elastic mandrel, the rigid mandrel can control the section distortion of the composite tube better, but the maximum difference is only 1.13%. The controlling effect of wall thickness reduction rate of elastic mandrel is better than that of rigid mandrel, and the maximum difference is 3.27%. Considering the cross section distortion and the wall thickness reduction, the filling effect of the elastic mandrel on the bimetallic composite tube is better.
2020 Vol. 63 (21): 54-62 [Abstract] ( 122 ) HTMLNew PDF (2750 KB)  ( 304 )
63 Research on Control Method of Surface Groove of Titanium Alloy SPF/DB Four-Sheet Structure
LI Baoyong,ZHANG Tiejun,ZHANG Kaifeng,YAO Wei,QIN Zhonghuan,LIU Qi,LIU Wei
DOI: 10.16080/j.issn1671-833x.2020.21.063
In this paper, through the combination of the finite element numerical simulation and the actual test, the causes of the surface groove formation of superplastic forming/diffusion bonding (SPF/DB) four-sheet structure are analyzed and studied. The orthogonal test method is used to analyze the influence of four factors on the surface groove of the panel, including the strain rate έ, the diffusion connection width b, the thickness ratio t of the core plate to the panel and the friction coefficient u of the die. It can be seen that the thickness ratio t of the core plate to the panel is the most important factor of the surface groove of the panel. Based on the experimental study, a method of pressing 0.2MPa back pressure on the panel surface is proposed, which can effectively control the formation of the surface groove of SPF/DB four-sheet structure.
2020 Vol. 63 (21): 63-67 [Abstract] ( 145 ) HTMLNew PDF (2744 KB)  ( 198 )
       APPROACHING SCIENCE
68 Build the Yangtze River Delta Carbon Fiber Composite R & D Sharing Service Platform to Help Build Carbon Fiber Industry Ecosystem
2020 Vol. 63 (21): 68-69 [Abstract] ( 146 ) HTMLNew PDF (418 KB)  ( 54 )
       RESEARCH
70 Research on Civil Aircraft Composite Material Equivalence Verification Method and Type 2 Error Control
TU Sheng, YU Yin,Lü Xinying,NIKITA Kalutskiy
DOI: 10.16080/j.issn1671-833x.2020.21.070
 Composite equivalence plays an important role in airworthiness certification of civil composite aircraft. Based on the verification principle of composite equivalence, a method for verifying equivalence was investigated for the key parameters that control the properties of composites. Theoretical analysis method of the type 2 error in the composite equivalence was derived by the method of hypothesis test and the measures to reduce the probability of type 2 error were discussed. The results show that the hypothesis test is used to verify the composite equivalence. More attention should be paid to type 2 error. Increasing the number of test samples can reduce the probability of type 2 error. In order to control the type 2 error and reduce the cost of verification, the location of composite application in civil aircraft should be taken into account to select the number of samples.
2020 Vol. 63 (21): 70-79 [Abstract] ( 166 ) HTMLNew PDF (2063 KB)  ( 296 )
80 Automatic Detection of Non-Welding Defects Based on Metallographic Photographs of Diffusion Bonding Samples
HU Jinghui,XIE Pengzhi, YANG Wei, YAO Gang
DOI: 10.16080/j.issn1671-833x.2020.21.080
This paper introduces the application of machine learning methods in industrial informationization, and proposes the construction method of machine learning platform to satisfy the automatic detection requirements in typical equipment production of aviation manufacturing. The method includes: construction of an overall scheme of the machine learning platform, design and optimization of the automatic detection model, training of the detection model and empirical experimental evaluation. This paper takes the automatic detection of diffusion bonding defects of stator vanes as an example, and trains the model with defect detection accuracy which is more than 96%, verifies the feasibility and effectiveness of the machine learning platform.
2020 Vol. 63 (21): 80-84/97 [Abstract] ( 123 ) HTMLNew PDF (1848 KB)  ( 305 )
85 Rapid Analysis Method of Strength for Aircraft Pipeline
CHEN Xiaoyu,QIAN Wenqing,BAO Yidong,SHU Yang,CUN Wenyuan
DOI: 10.16080/j.issn1671-833x.2020.21.085
Aiming at the difficulties in the overall analysis of the failure of aircraft pipelines, a rapid method for analyzing the strength of aircraft pipelines is proposed. Combining CAEPIPE software with ABAQUS software, the finite element method is used to simulate the strength of the aircraft pipeline. For the analysis difficulties caused by the existence of flexible joints in aircraft piping systems, first, the CAEPIPE software is used to analyze the pipeline system as a whole, eliminating the complex iterative calculation for flexible joints in the traditional overall analysis. Then, based on the overall analysis, further detailed analysis of the dangerous area using ABAQUS software is carried out to ensure the accuracy of the intensity analysis. The proposed analysis method greatly improves the efficiency of the analysis based on the reliability of the strength analysis.The research work has reference value for clarifying changes in aircraft pipelines after loading, studying the failure mode of pipelines, checking pipelines strength, and optimizing the piping system structure.
2020 Vol. 63 (21): 85-91 [Abstract] ( 150 ) HTMLNew PDF (3151 KB)  ( 201 )
92 A Method of Constructing Flexible Agile Production Cell for Aircraft System Parts
PAN Deng, ZENG Debiao, LI Guohua,LI Guojin,YANG Yang
DOI: 10.16080/j.issn1671-833x.2020.21.092
Facing the features of aircraft system parts production, such as multi varieties, small part size, lots of small batches, traditional NC production mode hit the bottleneck in improving productivity and reducing manual work. Therefore, this paper proposed a method for flexible agile production cell construction based on integrated control, automatic cutting compensation, industrial robot application, and image recognition. With applying this method, totally automatic aircraft system part production can be realized, including automatic parts storing, automatic material loading and unloading, automatic NC cutting, automatic measuring, and automatic cutting compensation. In order to validate the method, a real production cell has been constructed by using this method in a certain plant, and it is capable of manufacturing automatically without manual work in a continuous 24 hours. So, this method can help to improve the productivity of aircraft system parts and lower the labor costs at the same time.
2020 Vol. 63 (21): 92-97 [Abstract] ( 156 ) HTMLNew PDF (2171 KB)  ( 519 )
98 Research on Vibration Monitoring and Fault Diagnosis of Mechanical Spindle Bearings
WANG Yipeng, LI Lianyu, LI Yong
DOI: 10.16080/j.issn1671-833x.2020.21.098
A vibration monitoring and analysis method based on RMS vibration value and spectrum analysis is proposed to solve the problem of non-stationary characteristics of mechanical spindle in CNC machine tools and the monitoring of spindle running state. In this paper, the research is carried out on a mechanical spindle of a gantry machine tool. The vibration velocity value of the vibration tester is selected for rapid state identification. After the abnormality is found, the bearing of the important component of the spindle is continuously monitored, and the defect position of the bearing is diagnosed by spectrum analysis. The results show that the vibration monitoring and analysis method can quickly and effectively diagnose the fault position of the mechanical spindle, and take measures in advance to avoid further deterioration of the fault.
2020 Vol. 63 (21): 98-101 [Abstract] ( 156 ) HTMLNew PDF (1537 KB)  ( 367 )
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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
· 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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