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2019 Vol. 62, No. 23/24
Published: 2019-12-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 On-Line Inner Porosity Defect Detection of Aluminum Alloy Robotic Welding for Aerospace
ZHANG Zhifen, ZHANG Linjie, YANG Zhe, REN Wenjing, WEN Guangrui
DOI: 10.16080/j.issn1671–833x.2019.23/24.014
Robotic argon tungsten arc welding (GTAW) of aluminum alloy is the main forming manufacturing method of key parts in aerospace, in which inner porosity is a typical defect. Due to its weak correlation to sensing data, accurate on-line porosity detection is still challenging. The porosity was qualitatively and quantitatively characterized in terms of distribution, composition and size using SEM and EDS. Two types of porosity were discovered as well as the importance of Mg during the process of porosity generation and growth. The strong correlation between porosity and hydrogen spectrum line (656.28nm) was investigated and established using principal component analysis. A new real-time porosity detection for Al alloy was proposed by means of PCoefHS (PCA Coefficient of HI Spectrum). Finally, different levels of porosity were visualized by combining PCA–Tsne. The verification shows that three types of welding seams with no porosity, moderate porosity and chain-type severe porosity can be effectively detected and visualized.
2019 Vol. 62 (23/24): 14-24 [Abstract] ( 213 ) HTMLNew PDF (42380 KB)  ( 260 )
       COVER STORY
26 Study on Stress Distribution of Cutting Tool for Cutting Superalloy Under High-Pressure Cooling
WU Mingyang, WU Shujie, CHU Weixu, LIU Keke, CHENG Yaonan
DOI: 10.16080/j.issn1671–833x.2019.23/24.026
Superalloys are widely used in aerospace and other fields, and are a kind of typical difficult-to-cut material. PCBN is a kind of superhard tool material, which has excellent performance in processing superalloys, but there are some phenomenon such as tool wear and serious damage in cutting process. High-pressure cooling is a new cooling method, which can effectively reduce the mechanical impact and affect the stress distribution of cutting tools. Therefore, it is important to study the stress distribution of cutting tools under high-pressure cooling. Firstly, tool stress model under high-pressure cooling is established to provide theoretical basis for tool stress variation law under high-pressure cooling; Secondly, the finite element method is used to simulate the stress distribution of cutting tools under different cooling conditions, cutting parameters and cooling pressures, and the influence law of different cutting conditions on the stress of cutting tools is obtained; Finally, the high-pressure cooling test is carried out to analyze the cutting force, stress distribution of tool and tool breakage, which provides a certain technical basis for efficient processing of superalloys and tool optimization under high-pressure cooling.
2019 Vol. 62 (23/24): 26-34 [Abstract] ( 134 ) HTMLNew PDF (12174 KB)  ( 125 )
       FORUM
38 Study on Typical Laser Processing Technologies and Applications in Aeronautical Manufacturing
LI Xing, GUAN Yingchun
DOI: 10.16080/j.issn1671–833x.2019.23/24.038
Because of the extreme and complex working environment, the aviation industry has very strict requirements for the processing quality and accuracy of material. Compared to traditional manufacturing technology, laser processing technology has the characteristics of small heat-affected zone, high efficiency and easy automation, therefore it has broad application prospects in the field of aeronautical manufacturing. Combining with the characteristics of aviation industry, the applications of laser cladding, drilling, cleaning and processing functional surface structures have been reviewed in the study. The mechanisms of laser processing have been clarified, and the roles of laser processing on improving surface properties and processing quality have been analyzed. Finally, we summarized and prospected the outlet of laser processing in the field of aviation.
2019 Vol. 62 (23/24): 38-45,65 [Abstract] ( 333 ) HTMLNew PDF (34732 KB)  ( 348 )
46 Experimental Research on Femtosecond Laser Polishing of GH4099 Honeycomb Core
CHEN Feng1, LIU Qiaomu2, DU Peng2, HU Zengrong3
DOI: 10.16080/j.issn1671–833x.2019.23/24.046
The femtosecond laser “cooling” polishing method was proposed for processing of metallic honeycomb core under air atmosphere. The polishing process parameters were optimized by the two sliding-level method, and process window prediction model of GH4099 sheet was determined firstly. The set of optimal process parameters for least surface roughness combined with processing efficiency is an off-focus distance of 0.2mm, a laser powder of 0.3W, a scanning space of 10μm, and a scanning speed of 2.3m/s. Under this condition, the surface roughness of GH4099 honeycomb core specimen decreased by 65%, and the polishing efficiency is 1.2h/(210mm×210mm).
2019 Vol. 62 (23/24): 46-51 [Abstract] ( 131 ) HTMLNew PDF (3941 KB)  ( 320 )
52 Effect of Laser Heating Temperature Field on 38CrNi3MoV Quenching Microstructure and Properties
KONG Xianjun, WANG Minghai, WANG Ben, ZHENG Yaohui, WANG Yang, YANG Lijun
DOI: 10.16080/j.issn1671–833x.2019.23/24.052
In order to improve the hardness and anti-friction wear performance of the barrel, the finite element predictive model of the temperature field of the continuous semiconductor laser heating pipe line was established, and the effect of laser parameters on the temperature field of the pipe line was simulated. Combined with the simulation results, the mathematical relationship between the depth of the quenching layer and the peak temperature of the temperature field was calculated. The laser quenching test was carried out and the effect of laser power, laser diameter and laser scanning speed on the hardness and depth of the hardened layer was investigated. The microstructure change after quenching was observed by using optical microscope. The results showed that the average hardness after laser quenching was increased from 400HV to 710HV, which is increased by 43.66%, and the depth of the hard line of yin and yang lines was 1.22mm and 0.61mm, respectively. After quenching, the surface roughness of the yang line material increased from 0.548μm to 0.7005μm, and the surface roughness of the yin line material decreased from 4.424μm to 3.804μm, respectively, which is meeting the requirements of use. The microstructure transformation of the yin and yang lines after quenching was observed and analyzed using optical microscope, and the transformation rules after laser quenching was explored.
2019 Vol. 62 (23/24): 52-58 [Abstract] ( 96 ) HTMLNew PDF (9137 KB)  ( 98 )
59 Temperature Fields and Residual Stress of Laser Welded AISI 304 Steel-Niobium Dissimilar Joint
SHI Chao, SHI Mingxiao, ZHAO Jian, CHEN Shujin, YANG Zhidong
DOI: 10.16080/j.issn1671–833x.2019.23/24.059
The dynamic simulation of AISI 304 steel–Nb dissimilar metal laser welding process is carried out by using SYSWELD software. On the basis of studying the temperature field of laser welded AISI 304 steel–Nb dissimilar joint, the residual stress distribution of welded sheet is analyzed. The results show that the temperature field of dissimilar metal welding is asymmetrical, and the high temperature region of Nb side is wider than that of stainless steel side. And there is the maximum residual tensile stress in the middle of weld along the welding direction, whether transverse residual stress or longitudinal residual stress. Perpendicular to the weld direction, the transverse residual stress and longitudinal residual stress are larger in the welding line near line section, and the distribution pattern is “M”. The longitudinal residual stress is residual tensile stress in the weld zone, and the transverse residual stress appears compressive stress in the center of the weld.
2019 Vol. 62 (23/24): 59-65 [Abstract] ( 128 ) HTMLNew PDF (9400 KB)  ( 137 )
       APPROACHING SCIENCE
66 Focus on Strategic Requirements, Developing Key Technologies of Aeronautical Component Forming and Connection
2019 Vol. 62 (23/24): 66-67 [Abstract] ( 134 ) HTMLNew PDF (763 KB)  ( 210 )
       RESEARCH
68 Application of Composites Automatic Tape Laying Technology in Aircraft Panel
TANG Shanshan, WANG Haojun, LU Bin, GUO Jungang
DOI: 10.16080/j.issn1671–833x.2019.23/24.068
With the continuous development of the aviation industry, advanced composite materials have gradually become the main materials for aircraft in the future because of their excellent weight-loss performance and high degree of designability. Its usage and application in aircraft have become one of the important symbols to measure the advances of aircraft. This paper discussed the present situation and development prospect of composites fiber automatic laying technology, and introduced the application of composites automatic tape laying technology on the MA700 aircraft panel.
2019 Vol. 62 (23/24): 68-73 [Abstract] ( 157 ) HTMLNew PDF (10045 KB)  ( 111 )
74 Research on Technology of Automatic Position-Changing System of Wing Parts
CHEN Hao, FENG Kejin
DOI: 10.16080/j.issn1671–833x.2019.23/24.074
Nowadays, for the requirement of developing automation in the process of aircraft manufacturing, higher requirements are placed on the assembly accuracy, methods, space occupancy, control mode and personal safety of the various components of the aircraft. Due to the assembly work, it has become one of the vital problems to be solved that large parts of the aircraft can’t change their position automatically. Traditional position-changing modes have problems such as inefficient use, large space occupation, operational difficulties and safety hazards, which make it impossible to meet the production requirements of modern aviation manufacturing industry, so there is an urgent need for improvement and innovation. In this paper, requirements of the automatic position-changing of the wing parts are taken as the research content. First, the structural characteristics and position-changing requirements of the wing parts are analyzed. Then, combined with the principle of the crank slider mechanism, a new automatic position-changing system and control system are designed. At last, based on the finite element analysis method, the MSC. Patran & Nastran engineering software is used to perform the strength calculation on the main load-bearing structure to meet the demand of the secure and reliable automatic position-changing of the wing parts.
2019 Vol. 62 (23/24): 74-78，83 [Abstract] ( 119 ) HTMLNew PDF (2957 KB)  ( 342 )
79 Research and Application of Measurement Programme of Large Parts of Aircraft Joint System
FU Jingli, HOU Zhaoke, XIE Xing
DOI: 10.16080/j.issn1671–833x.2019.23/24.079
Since the development of digital design for aircraft, the accuracy and quality of aircraft assembly have been greatly improved. At the same time, new requirements have been put forward for the measurement of assembly process. Therefore, only through efficient measurement means and schemes can the aircraft assembly accuracy be satisfied. Based on the establishment of measurement system and the transfer station technology of laser tracker, this paper studies the measurement technology of attitude adjustment of large components of the large-scale fire extinguishing/rescue amphibious aircraft AG600. The attitude adjustment measurement of the aircraft’s large parts is based on the measurement of several reference points on the parts by laser tracker, and the adjustment of the aircraft’s attitude is realized by flexible assembly tooling, so as to meet the requirements of the aircraft installation. For the traditional measurement method, the laser tracker is used for the transfer station measurement, which is the simplest and most effective method for the large aircraft parts docking measurement.
2019 Vol. 62 (23/24): 79-83 [Abstract] ( 169 ) HTMLNew PDF (8204 KB)  ( 146 )
84 Aerospace-Cable Fault Location Technology Research Based on Time Domain Reflectometry (TDR)
WANG Danyang, TANG Jianjun, CHEN Ou, JING Shicai
DOI: 10.16080/j.issn1671–833x.2019.23/24.084
As an important part of aircraft, the cable is crucial to aircraft performance and the flight safety. Because of the difficulty to locate the fault after aerospace-cable been installed in the plane, this paper has researched basic characteristic of the cable and studied the fundamental theory of TDR. Then the experiments are designed and conducted, which not only validates the fault location method based on TDR, but also obtains the effective waveform of typical cable faults and the criterion. These result could provide a guide of fault identification and location, and reduce time.
2019 Vol. 62 (23/24): 84-88，96 [Abstract] ( 152 ) HTMLNew PDF (7817 KB)  ( 101 )
89 Business and Technology Research of Large Aircraft Extended Enterprise Collaboration
LI Mei
DOI: 10.16080/j.issn1671–833x.2019.23/24.089
The development and manufacturing mode of large aircraft has transformed from one design institute with one factory to “Main manufacturer – Supplier” mode. Which also is the significant transformation from single collaboration systems to extended enterprise collaboration systems. This article describes the supplier collaboration mechanism of Boeing and Airbus, analyzing the key challenges in supplier collaboration processes of one specific large aircraft. On the basis, proposes the collaboration architecture and digital platform application architecture for extended enterprise, finally demonstrates the key technologies and validation results in detail.
2019 Vol. 62 (23/24): 89-96 [Abstract] ( 129 ) HTMLNew PDF (1990 KB)  ( 382 )
97 Research on RTCP Calibration Algorithms for CNC Machine Tools Based on HNC–8 Five-Axis Linkage
ZHAO Xi, SUN Hailong, ZENG Chao
DOI: 10.16080/j.issn1671–833x.2019.23/24.097
Five-axis RTCP functional machine tool can calculate the deviation of rotary displacement caused by the tool point, translating the linear axis to ensure that the coordinates of tool center point are fixed in workpiece coordinate system. Therefore, compared with machine tools without RTCP function, it can avoid the complexity of program control and improve the control accuracy. The key of RTCP control technology is to select the fixed parameters of machine tool model, that is, whether the RTCP parameters are accurate or not, and the measurement accuracy of RTCP parameters directly affects the control performance of machine tools. In this paper, the universal RTCP algorithm and RTCP calibration technology are studied based on the five-axis machine tool with HNC–8 double pendulum head structure of HNC system. The calibration method of RTCP double pendulum head is proposed, and the control accuracy of five-axis machine tool is tested and verified. Compared with traditional measurement technology, the proposed calibration algorithm improves the measurement efficiency while greatly improving the measurement accuracy.
2019 Vol. 62 (23/24): 97-101 [Abstract] ( 192 ) HTMLNew PDF (8421 KB)  ( 218 )
  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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