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2017 Vol. 60, No. 3
Published: 2017-02-01
FEATURE
FIGURE
FORUM
NEW VIEWPOINT
RESEARCH
C0NTENTS
COVER STORY
 
       C0NTENTS
6 C0NTENTS
2017 Vol. 60 (3): 6-10 [Abstract] ( 134 ) HTMLNew PDF (3543 KB)  ( 271 )
       FEATURE
16 Study on Properties of Discharge Crater of CFRP Under Single Pulse Discharge
YANG Xiaodong, HUANG Xiaonan
DOI: 10.16080/j.issn1671-833x.2017.03.016

Properties of discharge crater of CFRP are researched through a series of single discharge experiments. It is found that the shapes and numbers of discharge craters are different in different arrangement directions of carbon fiber. When the electrode and carbon fiber is perpendicular, 86% of discharge craters are multiple. At last, the reason why multiple
discharge craters are generated is analyzed.
2017 Vol. 60 (3): 16-19 [Abstract] ( 262 ) HTMLNew PDF (3906 KB)  ( 652 )
       FIGURE
20 Continuous Innovation for Powerful Country in Aviation Aluminum Alloy Manufacturing
2017 Vol. 60 (3): 20-21 [Abstract] ( 169 ) HTMLNew PDF (1482 KB)  ( 451 )
       COVER STORY
22 Research on Precision EDM Technology for Closed Integral Component of Difficult-to-Cut Material
ZHAO Jianshe, WANG Wenfeng, Lü Yanming, FAN Yantao, LIU Dingming
DOI: 10.16080/j.issn1671-833x.2017.03.022

It is great difficult to manufacture a closed integral component due to its poor processing accessibility caused by complicated structure of air flow channel between two blades, especially the large bending and twisting degree in the channel as well as its component materials of high strength alloy. To solve this problem, several key technologies of electrical discharge machining (EDM) are discussed, such as division of the processing zone among the blades, shaped electrode and its motion trajectory design, process benchmarking unification, process parameters selection and optimization,simulation of EDM process and so on. On top of this, typical closed integral components are studied and manufactured. It is shown from the experimental results the above-mentioned technologies enable numerical control EDM technology to realize precise and reliable manufacture of closed integral components.
2017 Vol. 60 (3): 22-27 [Abstract] ( 176 ) HTMLNew PDF (1617 KB)  ( 608 )
       FORUM
30 Latest Technology Progress of Superalloy and Titanium Alloy Machined by Electrical Discharge Machining
CHANG Weijie, XI Yanying, CHEN Yuanlong
DOI: 10.16080/j.issn1671-833x.2017.03.030
Superalloy and titanium alloy, due to their superior performance, are widely used in aerospace field. But
because of its high temperature strength, poor thermal conductivity, serious work hardening phenomenon and severe tool
wear during the machining processing, the processed surface quality is low. Titanium alloy has small plastic and strong activity
which is easy to be oxidized or produces hydrogen brittleness; It is hard to be machined since its serious work-hardening
and sticking cutters during machining. Electrical discharge machining (EDM), relying on high temperature generated
by spark discharge to remove materials, the tool electrode and workpiece do not contact, processing is not limited by the
mechanical properties of materials, so it has important significance in the processing for superalloy and titanium alloy. The
latest progress of superalloy and titanium alloy machined by EDM is reviewed in six aspects, including EDM contour machining,
EDM wire-cutting, Micro-EDM, EDM milling, EDM surface strengthening, and other EDM processing techniques
and main research achievements are introduced.
2017 Vol. 60 (3): 30-39 [Abstract] ( 313 ) HTMLNew PDF (1870 KB)  ( 1624 )
40 Latest Technology Progress of Superalloy and Titanium Alloy Machined by Electrical Discharge Machining
CHANG Weijie, XI Yanying, CHEN Yuanlong
DOI: 10.16080/j.issn1671-833x.2017.03.040
Superalloy and titanium alloy, due to their superior performance, are widely used in aerospace field. But
because of its high temperature strength, poor thermal conductivity, serious work hardening phenomenon and severe tool
wear during the machining processing, the processed surface quality is low. Titanium alloy has small plastic and strong activity
which is easy to be oxidized or produces hydrogen brittleness; It is hard to be machined since its serious work-hardening
and sticking cutters during machining. Electrical discharge machining (EDM), relying on high temperature generated
by spark discharge to remove materials, the tool electrode and workpiece do not contact, processing is not limited by the
mechanical properties of materials, so it has important significance in the processing for superalloy and titanium alloy. The
latest progress of superalloy and titanium alloy machined by EDM is reviewed in six aspects, including EDM contour machining,
EDM wire-cutting, Micro-EDM, EDM milling, EDM surface strengthening, and other EDM processing techniques
and main research achievements are introduced.
2017 Vol. 60 (3): 40-45 [Abstract] ( 202 ) HTMLNew PDF (2624 KB)  ( 524 )
46 Research Status of High Efficiency Discharge Machining Technology
QIU Mingbo, YU Xiaochun
DOI: 10.16080/j.issn1671-833x.2017.03.046
EDM technology has become a mature and indispensable processing method after continuous and rapid
development for many years. New processes, methods and equipment emerge in an endless stream. How to improve the
machining efficiency has become the focus of human attention, but it is not obvious to improve the processing efficiency
through various processing methods. The electrical discharge machining must avoid arc discharge in order to prevent damage
to the workpiece. However, if we can control the break-make process of the arc effectively and remove workpiece
material by using high energy density of arc, it will improve the efficiency of discharge machining greatly. This is a new
direction of high efficiency discharge machining in recent years. In addition, EDM ablation uses spark discharge as the induced
energy to cause a controlled combustion reaction between metal matrix and the incoming oxygen. It uses chemical
energy produced by the combustion reaction to remove workpiece material. The energy of ablation is much larger than that
of pulse power supply, and it is another new direction of high efficiency discharge machining. This paper summarizes the
research status of high efficient processing methods, including EDM, arc discharge machining and electrical discharge ablation
machining.
2017 Vol. 60 (3): 46-55 [Abstract] ( 234 ) HTMLNew PDF (7854 KB)  ( 158 )
56 Effects of Planetary Movement of Electrode on Aspect Ratio of Micro Hole Drilled by Micro EDM
ZHU Yingbao, YU Zuyuan, LI Jianzhong, GUO Xuejie, YIN Guoqiang
DOI: 10.16080/j.issn1671-833x.2017.03.056
Micro EDM has the ability to drill high aspect ratio micro holes in metallic materials. With the increasing
of depth of micro holes drilled by micro EDM, abnormal discharges appears frequently because machining debris and
gaseous bubbles cannot be effectively removed from hole. Therefore, the aspect ratio of micro hole is limited. While the
planetary movement of electrode can increase the aspect ratio of micro hole duo to improving machining debris removal
ability. The impact factors of the planetary movement parameters and electrical parameters on the aspect ratio of micro hole
are studied, Experimental results indicate that the aspect ratio of micro hole increases along with the increase of eccentric
radius and capacitor under different machining conditions. The planetary movement speed is irrelevant to the aspect ratio of
micro hole. These results are helpful for actual production to improve the aspect ratio of micro hole.
2017 Vol. 60 (3): 56-61 [Abstract] ( 260 ) HTMLNew PDF (2210 KB)  ( 532 )
       NEW VIEWPOINT
62 Aeroengine Assembly MES System Design
XU Lianfang, HAN Fujin, WU Fayong, FENG Shaobao
DOI: 10.16080/j.issn1671-833x.2017.03.062

This article introduces the development trend of MES technology in recent years, and analyses the characteristics and mode of aeroengine assembly business. Based on the analysis result, we completed the assembly MES system design. For the core function of assembly MES system, we establish aeroengine assembly and disassembly process management solution based on the technology of network diagram, and aeroengine physical technical state management solution
based on integration pattern.
2017 Vol. 60 (3): 62-66 [Abstract] ( 431 ) HTMLNew PDF (860 KB)  ( 1250 )
       RESEARCH
68 Analysis of Main Technological Parameters in Compressor Experimental Blade Injection Deformation
ZHAO Dezhong, WANG Wenhu, JIANG Ruisong, CUI Kang, JIN Qichao
DOI: 10.16080/j.issn1671-833x.2017.03.068
Resign blade used in low speed research compressor of aeroengine injection molding process is complex.
The precision of blade forming is determined by the cavity and technological parameters. In order to explore the influence
of technological parameters and their interaction on blade forming precision. Twice-analysis method of the main technological
parameters of the compressor blade injection molding is studied in this paper. Firstly, the influence of technological
parameters such as melt temperature, mold temperature on blade deformation is studied based on factorial experiment.
Then, the influence rule of the main process parameters and their interaction on blade deformation is revealed based on the
response surface method. The results of simulation experiments show that packing time, the interaction of packing time and
melt temperature are the significant factors to blade deformation.
2017 Vol. 60 (3): 68-70 [Abstract] ( 232 ) HTMLNew PDF (2137 KB)  ( 355 )
74 Research of Microstructure and Mechanical Properties of EBW Joint for Large Thickness Titanium Alloy
GUAN Feng1, NI Jiaqiang1, LIU Guangxin2, HOU Qi1, LIU Yanmei1, ZHAO Hongbo1
DOI: 10.16080/j.issn1671-833x.2017.03.074
Electron beam welding(EBW) of a 60mm thick TC4-DT titanium alloy is carried out. The properties of
EBW joint for the titanium alloy are researched by means of the microstructure, tension testing, impact testing and fracture
toughness testing. The results indicate that the welding performance of TC4-DT titanium alloy is excellent. The EBW joint
of TC4-DT titanium alloy is composed by the basketweave structure α, compared with the matrix, the EBW joints of TC4-
DT titanium alloy has similar tension strength. The impact toughness of the EBW joints is less than that of the forgings. The
fracture toughness performance of the EBW joints is excellent, but the fatigue crack propagation of the EBW joints is 20%
less than that of the forgings.
2017 Vol. 60 (3): 74-80 [Abstract] ( 260 ) HTMLNew PDF (2681 KB)  ( 562 )
78 Analysis and Design of Springs on Landing Gear Down-Lock Mechanism
YUAN Li 1，YU Sheng 2，ZHONG Sheng 1,MA Ying 1，NING Xiaodong 1
DOI: 10.16080/j.issn1671-833x.2017.03.078
Springs play a crucial role in airplane landing gear down-lock mechanisms. It is necessary to consider the
coordination between springs in down-lock mechanism and unlock actuator, the springs behavior impact on gear during
retraction and extension, and the free fall situation. The design process of springs on down-lock mechanisms is discussed,
specifications of springs design are listed, a new method different from force analysis is provided, and an example of
springs on down-lock mechanism design is given.
2017 Vol. 60 (3): 78-80 [Abstract] ( 280 ) HTMLNew PDF (1311 KB)  ( 538 )
81 Process Design Based on the Features Coding of Aircraft Structure Parts
Lü Bin，WANG Xiyang
DOI: 10.16080/j.issn1671-833x.2017.03.081
To solve the low-efficiency and the low-level automation of process decision for NC manufacture of aircraft
structure parts, process design of aircraft structure parts based on the features coding is proposed in this paper. Firstly,
using the group technology, processing elements of aircraft structure parts are classifed and then coded to form a table of
features coding. Then, the processing features obtained by features recognition are decomposed into the processing elements,
matching with the table of features coding and sorting to obtain the processing programs. Finally, process design
module of aircraft structure parts based on the features coding is developed on CATIA V5.
2017 Vol. 60 (3): 81-85 [Abstract] ( 256 ) HTMLNew PDF (1403 KB)  ( 585 )
86 Fault Case Library Construction Method Research Based on Rules and Fault Tree
CHEN Ruixun, LI Qing, XIE Haitao
DOI: 10.16080/j.issn1671-833x.2017.03.086
Based the integration of empirical knowledge and rules, structure of fault tree, on the lack of physical and
fault diagnosis rules supporting, the authors researched cases of aircraft malfunction and developed a method of constructing
a case library; Currently, there are no standardized descriptions of these aircraft fault cases. As a result of the necessity
of accurate fault diagnosis and its particularities, the authors built a model for aircraft malfunction diagnosis using fault tree
analysis and its rules of inference. In addition, the classification method of case libraries derived from the model could potentially
be beneficial in the process of updating existing case libraries. These case libraries may be applied to existing fault
diagnosis systems, provide troubleshooting guidance, and enable effective fault diagnosis utilizing case-based reasoning,
thereby improving their efficiency and proving the feasibility of the research methodology.
2017 Vol. 60 (3): 86-90 [Abstract] ( 308 ) HTMLNew PDF (1067 KB)  ( 1290 )
91 Review on Research of Aviation Spline
WANG Yongliang1, ZHAO Guang2,SUN Xucong2, LI Shengxiang2
DOI: 10.16080/j.issn1671-833x.2017.03.091
Spline transmission is simple, reliable and its specific power is high, so that its status in the aircraft is irreplaceable.
Spline has some characteristics such as high rotating speed, large transmission torque, light weight and harsh
working environment, some splines even can’t achieve lubrication and cooling. In addition, the support system of external
spline and the one of internal spline are isolated with each other. All these factors lead to the misalignment of spline connection
and the problems of lubrication and wear. From the 1950s, the research on the design of spline, lubrication and
wear, experiment, troubleshooting and maintenance has been carried out continuously by aeronautically developed countries,
forming systematical methods of design, experiment, operation and maintenance. However, China do few research on
spline, especially on aviation spline, unable to meet the demand of the aviation sector on the drive components. The spline
is often regarded as subsidiary components and common connecting parts in China, attracting less attention. This paper
summarizes the research progress of decades of domestic and international aviation spline. Studies of aviation spline on
failure, lubrication, vibration, wear, misalignment, rotor dynamics and experiment are analyzed and summarized, development
trend of aviation spline research is also discussed. This paper hopes to provide a reference for solving the problems of
misalignment, lubrication and wear problems faced in domestic aviation spline.
2017 Vol. 60 (3): 91-100 [Abstract] ( 282 ) HTMLNew PDF (2008 KB)  ( 1251 )
101 Research on Aeroengine Repair Digital Management System
WU Sanshuan1，CHANG Zhiyong2，LI Lianhui3
DOI: 10.16080/j.issn1671-833x.2017.03.101
To solve the digital management problem in aeroengine repair business process, the shortness of existing
mode is analyzed, and the application framework of aeroengine repair digital management system is put forward. Then the
multi-BOM evolution relationships and the correlations between this system and other information systems are studied, and
the design schemes of key function such as configuration management, material barcode management, digital army inspection
are given.
2017 Vol. 60 (3): 101-106 [Abstract] ( 272 ) HTMLNew PDF (1627 KB)  ( 702 )
107 Circuit Design and Analysis for Passenger Oxygen System of Civil Aircraft
LI Qingnan, SUN Jianfei
According to the airworthiness’ conformance of passenger oxygen system, this article analyzes the items
related to the electrical conformance, and constructs different power distribution ways to analyze the control circuit releasing
the oxygen masks. Finally, one control circuit about releasing the oxygen masks is designed, which based on quad independent
power sources.
2017 Vol. 60 (3): 107-109 [Abstract] ( 140 ) HTMLNew PDF (892 KB)  ( 433 )
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