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2017 Vol. 60, No. 12
Published: 2017-06-15
FEATURE
FIGURE
FORUM
NEW VIEWPOINT
RESEARCH
C0NTENTS
COVER STORY
 
       C0NTENTS
6 C0NTENTS
2017 Vol. 60 (12): 6-10 [Abstract] ( 122 ) HTMLNew PDF (2863 KB)  ( 529 )
       FEATURE
16 Research Progress on Bobbin Tool Friction Stir Welding
WEN Quan1, LI Wenya1, WANG Feifan2, YANG Xiawei1
DOI: 10.16080/j.issn1671-833x.2017.12.016
Bobbin tool friction stir welding (BT-FSW) is a significant variant of friction stir welding (FSW). The
self-support function is achieved by the lower shoulder of bobbin tool, making FSW easier to join closed structures such
as pipes or hollow extrusions. At present, the research and application of BT-FSW are still in the initial stage, and studies
on it are limited. The state-of-the-art of BT-FSW is reviewed based on the realized welding methods. This review provides
reference for the further development and engineering applications of BT-FSW.
2017 Vol. 60 (12): 16-23 [Abstract] ( 323 ) HTMLNew PDF (5790 KB)  ( 434 )
       FIGURE
24 Innovation Promoting the Development and Application of Magnesium Alloy
2017 Vol. 60 (12): 24-26 [Abstract] ( 116 ) HTMLNew PDF (1127 KB)  ( 486 )
       COVER STORY
28 Research and Application Development on Laser Micro Joining Technology
ZHAO Xingke 1, XING Desheng1, LIU Dayong 2
DOI: 10.16080/j.issn1671-833x.2017.12.028
With small focus spot, high power density and precise control of heat input, laser micro joining technique
has become a versatile flexible manufacture tool. Laser micro joining technique, using proper parameters, can fabricate micro
dimension, accurate shape as well as hybrid devises which find wide applications in various industries.
2017 Vol. 60 (12): 28-34 [Abstract] ( 263 ) HTMLNew PDF (2933 KB)  ( 418 )
       FORUM
38 Influence of SPS Temperature on Microstructure and Shear Strength of Copper/Nickel Powder/304 Stainless Steel Joints
TANG Qian, WU Shiwen, ZHAO Weikang, XIA Lihong, ZHANG Fuqin
DOI: 10.16080/j.issn1671-833x.2017.12.038
Copper/304 stainless steel joints with nickel powder were prepared by spark plasma sintering (SPS). The
influence of welding temperature on the microstructure and mechanical properties of the joint was studied. Copper and
304 stainless steel can be welded by using nickel powder as inter-layer. Cu/Ni diffusion layer and Ni/SS304 diffusion layer
formed at the joint interface because of the elemental inter-diffusion. The results showed that the diffusion of copper in
nickel is greater than that in stainless steel, and the thickness of Cu/Ni diffusion layer is larger than that of Ni/SS304 diffusion
layer. When the welding pressure was 10MPa and the welding temperature was 900℃, copper/304 stainless steel joint
has the best shear strength of 98MPa. Shear fracture morphology shows that copper/304 stainless steel joint has plasticity
and its fracture morphology was dimple, and the copper/stainless steel joint breaks at the middle of the nickel inter-layer
due to its low adhesive strength. The joint strength was limited by the strength of the nickel inter-layer.
2017 Vol. 60 (12): 38-42 [Abstract] ( 309 ) HTMLNew PDF (2679 KB)  ( 479 )
43 Welding Database and Expert System for Aviation
RONG Youzhen, LIU Renpei, WEI Yanhong
DOI: 10.16080/j.issn1671-833x.2017.12.043
Welding database and expert system is an important part of welding digital system. In recent years, with
the pace of the transformation of the aviation manufacturing industry to digital, intelligent direction up, attracting more
and more aviation enterprises to carry out the work of design and development of aviation dedicated welding database and
expert system. Now the welding database established in the field of aeronautical manufacturing has realized the effective
storage and sharing of aviation material welding base data, welding parameter data, welding performance data and typical
case data. The application of welding process design expert system can assist in the automatic design and management of
welding process documents, which greatly reduces the welding process file preparation cycle; The welding defect diagnosis
expert system can judge the defect type according to the defect characteristic or analyze the cause of the defect according
to the defect type, and has important practical application value to control and prevent the generation of various defects and
control the welding quality; On the basis of database platform , expert system platform and user rights management, the
welding information management platform realizes the online intelligent and cooperative work of welding process. With
the development of welding process of aviation manufacturing, based on the existing welding database and expert system
research, the welding quality prediction expert system and manufacturing big data analysis and mining technology applied
to the aviation welding database and expert system design will become the future development trend of aviation welding
expert system.
2017 Vol. 60 (12): 43-47 [Abstract] ( 333 ) HTMLNew PDF (1162 KB)  ( 498 )
48 Study on Welding Suitability of Large Vacuum High Voltage Electron Beam Welding Machine
GAO Feng, CHANG Ronghui, LIU Yanmei, DU Qiang
DOI: 10.16080/j.issn1671-833x.2017.12.048
This paper discusses the application of large scale high voltage electron beam welding machine in various
materials and structures. A systematic analysis was made on the process, mechanical properties and microstructure. The experimental
results showed that the application of high pressure electron beam welding has obvious advantages in the application
of various materials and structures. Changing heat treatment can effectively adjust the performance of electron beam
welding.
2017 Vol. 60 (12): 48-52 [Abstract] ( 270 ) HTMLNew PDF (2175 KB)  ( 528 )
53 Micro Friction Stir Welding Technology Research of Aluminum/Copper Ultra Thin Plate With Zero Tile Angle
LI Ying, ZHAO Huihui, ZHANG Dan, XU Kui, YIN Yuhuan
DOI: 10.16080/j.issn1671-833x.2017.12.053
The overlap joint, consisting of 6061 aluminum alloy which is 0.5mm thickness and T2 copper which is
2mm thickness, was welded in the micro friction stir welding process with zero tile angle. Meanwhile, the characterizations
of welding process were studied by analyzing the materials selection of welding tool, weld quality and mechanical properties.
Result showed that comparing to hot work die steel, welding tool made of high-speed tool steel had a longer working
life. As for the overlap joint of aluminum and copper, an excellent weld shape can be acquired through micro friction stir
welding with zero tile angle, moreover, the process window was wide, the mechanical properties of the joint are excellent,
and its load bearing capacity can be over 95% of that of the 6061 aluminum alloy. However when the welding speed was
200mm/min and the spindle speed over 25000r/min, the grooves defect appeared on the weld.
2017 Vol. 60 (12): 53-56 [Abstract] ( 222 ) HTMLNew PDF (2185 KB)  ( 650 )
       NEW VIEWPOINT
58 Research On Helicopter Product Information PLM Integration Technology
ZENG Weiping1,2, YU Chunjiang1, MI Weiping1, HUANG Wei1
DOI: 10.16080/j.issn1671-833x.2017.12.058
Helicopter product development with the development of information technology has been further standardized
and solidified, and digital means could effectively control the development of product data wiht effectively
bottom-up feedback. Under the influence of system engineering and concurrent engineering idea, combined with meta
model theory, the helicopter in the whole lifecycle of products development process and management system is sorted out,
expounds the helicopter product lifecycle management business logic architecture and technology integration architecture,
and analyzes the whole lifecycle management system integration technology. An effective solution is proposed for whole
lifecycle management and integration of helicopter product .
2017 Vol. 60 (12): 58-63 [Abstract] ( 237 ) HTMLNew PDF (1134 KB)  ( 504 )
       RESEARCH
64 Parameters Optimization of Fine Milling Titanium Alloy TB6 Based on Combined Process of Milling, Polishing and Shot Peening
LUO Yang, ZHAO Peng, LI Xun
DOI: 10.16080/j.issn1671-833x.2017.12.064
Titanium alloy TB6 is an important material in the field of aerospace manufacturing, and it is a typical
hard-to-process material. Experiments were conducted to optimize the milling parameter of combined processes of milling,
polishing and shot peening. The results indicated that surface roughness is mainly influenced by feed engagement (fz). When
fz < 0.2mm/z, the milling hardening is high and the surface roughness after shot peening was stable and correspondingly
low. When fz > 0.2mm/z, milling hardening declines and surface roughness after shot peening rises according to the rise of
fz. When linear velocity vs is between 20m/min and 40m/min, milling hardening declines and surface roughness after shot
peening rises according to the rise of vs. When vs is between 40m/min and 50m/min, milling hardening rises and surface
roughness after shot peening declines according to the rise of vs. The influence of cutting width ae on hardening and surface
roughness was not significant. The optimization results of milling parameters based on combined progresses of milling and
shot peening are vs=50m/min, fz =0.2mm/z, ae=1.0mm. After polishing is added, feed engagement (fz) could be improved
under 0.4mm/z.
2017 Vol. 60 (12): 64-69 [Abstract] ( 218 ) HTMLNew PDF (2184 KB)  ( 291 )
70 Microstructural Evolution for Ti-22Al-25Nb Alloy During Shear Spinning
WU Yang1, KOU Hongchao1, LIU Degui2, LI Jizhen2, TANG Bin1, LI Jinshan1
DOI: 10.16080/j.issn1671-833x.2017.12.070
The effect of spinning temperature (910℃ and 1000℃ ) and reduction ratio (0, 10%, 30%) during shear
spinning on the microstructural evolution of Ti-22Al-25Nb alloy is investigated. The experimental results show that the
microstructure of Ti-22Al-25Nb alloy consisted of α2 phase, B2 phase and O phase. During spinning process, B2 grains
are elongated along the spinning direction. The equiaxed fine grains which distribute around the elongated grains are related
to dynamic recrystallization. The spinning temperature can significantly affect the size and morphology of α2 phase and O
phase. With the increasement of temperature, lamellar O phase become shorter and coarser, α2 phase tends to be equiaxed.
Deformation affects the volume fraction of α2 phase and the morphology of O phase. Obviously, the volume fraction of α2
phase decreases and O phase transforms from lamellar to clubbed as the increasement of reduction ratio. Thus, not only the
dynamic recrystallization and deformation of grains occur for Ti-22Al-25Nb alloy during shear spinning, but also involves
the complex phase transition which is difficult to control.
2017 Vol. 60 (12): 70-73 [Abstract] ( 235 ) HTMLNew PDF (3311 KB)  ( 396 )
74 Study on Manufacturing Technology of Ω Type Stiffened Panel of Civil Aviation
MA Gang, TANG Wenfeng
DOI: 10.16080/j.issn1671-833x.2017.12.074
Ω type composites stiffened panel has been widely used in large civil aircraft due to its structural advantage.
But some difficulties exist in how to pressurize these Ω type stiffened panels during the co-curing process. Especially
there are strict airworthiness compliance review requirements in the field of civil aviation products manufacturing, thereby
further increasing the manufacturing difficulty. After a number of tests, the group decided to adopt thin-walled rubber balloon
forming method to manufacture the Ω type stiffened panel in order to meet design requirements and airworthiness requirements
finally.
2017 Vol. 60 (12): 74-77 [Abstract] ( 297 ) HTMLNew PDF (2232 KB)  ( 795 )
78 Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites
（中航复合材料有限责任公司，北京 101300）
DOI: 10.16080/j.issn1671-833x.2017.12.078
In order to investigate the influence of interfaces on the mechanical properties and oxidation behaviors of
SiCf /SiC composites, SiCf /SiC composites with 3 different interfaces (PyC, PyC+BN-Ⅰ and PyC+BN-Ⅱ ) were prepared
via precursor infiltration and pyrolysis (PIP) method. Results showed that SiCf /SiC composites with PyC interface exhibited
the highest flexural strength of 380MPa. SiCf /SiC composites with PyC+BN-Ⅰ and PyC+BN-Ⅱ interfaces exhibited
flexural strengths of 282MPa and 259MPa, respectively. The flexural strength retention rate of SiCf /SiC composites with
PyC+BN-Ⅱ interface was 54% after heat treatment at 1200℃ in air for 2h, and all SiCf/SiC composites with different interfaces
exhibited brittle fracture after heat treatment. The microstructure of SiCf /SiC composites demonstrated that the oxidation
of interfaces and fibers caused the failure of the composites. Energy dispersive spectrometer had not detected oxygen
on SiC fibers of SiCf /SiC composites with PyC+BN-Ⅰ and PyC+BN-Ⅱ interfaces, which indicated that BN interface can
effectively protect fibers from oxidation.
2017 Vol. 60 (12): 78-83 [Abstract] ( 227 ) HTMLNew PDF (2722 KB)  ( 654 )
84 Analysis of Hollow Fan Blade Unexpected Failure in the HCF Test
WANG Jiaguang, LI Di, CHEN Yunyong, LIU Xiaofeng, LIAO Lianfang
DOI: 10.16080/j.issn1671-833x.2017.12.084
For the unexpected failure of hollow fan blade in the HCF test, vibration simulation and crack analysis
was done. The results indicated that, the failure region was not the high stress region, and the crack initiates from crossing
area of thin plate and thick plate in the suction side, which was caused by fatigue. The failure mechanism was that thin plate
of local region distorted in the SPF process so that the thick and thin plates fret wore in the high cycle fatigue test, which
induces the fatigue failure. Based on the fatigue analysis, improvement measure was made through both optimizing the
parameters in the SPF process and adding CT inspection in the test process. Validation test showed that the improvement
measure was effective, and the unexpected failure problem was solved successfully.
2017 Vol. 60 (12): 84-88 [Abstract] ( 240 ) HTMLNew PDF (2363 KB)  ( 1205 )
89 Design and Simulation of Electron Beam Low Impedance Deflection Scanning Coil Based on Helmholtz Coil
LI Pinglin1, ZHANG Wei1, XU Haiying2, HUANG Yewen1
DOI: 10.16080/j.issn1671-833x.2017.12.089
In order to improve the electron beam deflection scanning frequency and magnetic field uniformity, a low
impedance deflection scanning coil for the electron beam gun is designed, employing the Helmholtz air-core coil. Adopting
the finite element analysis software ANSYS workbench, the magnetic field distribution of the deflection scanning coil is
simulated, and the electromagnetic field in the coil is measured by the gauss meter. It showed that the analog data is consistent
with the measured data and the magnetic flux density and uniformity of the magnetic field inside the coil could satisfy
the requirement of the electron beam high frequency deflection scanning. The actual scanning test showed that the coil can
achieve the two-point electron beam high frequency deflection scanning, reaching a 30kHz frequency.
2017 Vol. 60 (12): 89-93 [Abstract] ( 167 ) HTMLNew PDF (1481 KB)  ( 491 )
94 Study on Remove of Free-Form Surface Structure by Magnetic Polishing
LIN Longqiao, WANG Zhenzhong, CHEN Shiping
DOI: 10.16080/j.issn1671-833x.2017.12.094
Magnetic polishing technique has wide application potential due to the high adaptability of flexible tool to
the workpiece surface. The relevant polishing tools were developed, and a test platform was established in the paper. The
workpiece finish had been greatly improved after spot polishing on stainless steel flat parts, and the average removal efficiency
was 0.231μm /10 min, which verified the feasibility of the magnetic polishing method. Then two kinds of free-form
surface structures were polished by magnetic polishing method. First, stainless steel parts with different curvatures were
polished by two different polishing feed movement ways. Experimental results showed that two polishing methods had the
ability to remove the contours of each curvature, and the removal amount falls between 0.14-1.33μm. Secondly, the removal
efficiency was between 8.957-12.587μm /10min after spot polishing the microstructured free-form surface, and the
smoothness of the contour is improved. Preliminary experiments showed that the magnetic polishing method had the ability
to remove both free-form surface structures, so it can explore further magnetic polishing technology used in deterministic
polishing of free-form surface structure.
2017 Vol. 60 (12): 94-98 [Abstract] ( 210 ) HTMLNew PDF (3675 KB)  ( 406 )
99 Study on Forming Dimension of Metal Part in Composite Milling
XIA Ranfei, WU Huaizhu, XU Jing
DOI: 10.16080/j.issn1671-833x.2017.12.099
To overcome the problem of part forming effect and surface quality in surfacing metal forming, the size
model of single and multiple weld was established, the relationship between the welds was analyzed, and the optimum
deposition distance was determined. At the same time, the orthogonal experiment was used to analyze the influence of the
welding parameters on the forming dimension, and the universality of the model was verified. In the example, through the
design of the composite milling system, changing the forming path, the forming size was effectively controlled, and the feasibility
and effectiveness of the process were verified.
2017 Vol. 60 (12): 99-103 [Abstract] ( 196 ) HTMLNew PDF (1832 KB)  ( 308 )
104 Design of Small Beam Spot Electron Beam Pulse Bias Power Supply
FAN Kai, XU Haiying, YANG Bo, SANG Xinghua
DOI: 10.16080/j.issn1671-833x.2017.12.104
In order to obtain a cost-effective electron beam surface treatment technology, using a constant frequency
voltage regulator circuit, we developed a new type of bias pulse power supply. The power supply was composed of a bias
main circuit topology, a bias voltage transformer and a bias rectification filter circuit, where the bias main circuit was composed
of a bias base value generating circuit and a bias voltage generating circuit. The bias value generating circuit controls
the bias voltage pulse base value, and the bias pulse generation circuit controls the bias pulse frequency and the duty ratio.
The pulse base value, pulse frequency and duty ratio of the pulse bias power supply are continuously adjustable, and the
amplitude, beam frequency and duty ratio of the pulse beam are adjusted accordingly. The waveforms of the output voltage
of the pulsed bias power supply and the output waveform of the pulsed bias power supply are stable and tunable, which can
meet the requirements of small beam spot pulse electron beam bombardment process.
2017 Vol. 60 (12): 104-109 [Abstract] ( 213 ) HTMLNew PDF (1817 KB)  ( 342 )
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