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2020 Vol. 63, No. 8
Published: 2020-04-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
FEATURE
14
Multi-Source Heterogeneous Data Management Method for Intelligent Management and Control of CNC Machining Process
WANG Meiqing，MA Pengfei,BIAN Yuan， CAO Yansheng
DOI: 10.16080/j.issn1671-833x.2020.08.014
In order to improve the intelligent management and control capabilities of CNC machining processes, the data acquisition requirements for intelligent management and control of machining processes are analyzed. The characteristics of various types of data are sorted out in real-time, data volume, structured degree, access speed, and scalability. Based on this, multi-source heterogeneous data which include manufacturing situation data, real-time process data and product inspection data, are divided into three categories: non-real-time structured data, real-time process data, and historical process data. Data organization and management strategies that incorporate data management methods such as memory databases, relational databases, non-relational databases, and technical data management streaming (TDMS) files, enable the integrated management of manufacturing situation data and process data. Finally, the application of intelligent management and control of a typical thin-walled rotating part CNC machining process is taken as an example to verify the feasibility and effectiveness of the proposed method.
2020 Vol. 63 (8): 14-24 [
Abstract
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219
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COVER STORY
26
Process Design and Application Based on Digital Model
GONG Yuqiang
DOI: 10.16080/j.issn1671-833x.2020.08.026
The new generation of aircraft at home and abroad has fully adopted digital design, so our manufacturing process department should take this as an opportunity to improve the process design method, make use of 3D product design data, comprehensively promote the process design method and application range based on digital models. This article proposes a method for aircraft assembly process coordination design based on digital mode, describes the definition of assembly coordination data, introduces the method and process of 3D process planning of production line, describes the manufacturing configuration design patterns based on digital models, puts forward a method for supplier delivery specifications based on digital model, describes the functions of the 3D assembly process instruction design platform, the digital assembly process design flow, and the application of virtual simulation.
2020 Vol. 63 (8): 26-35 [
Abstract
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333
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FORUM
38
Simulation and Experiments of Abrasive Assisted Electrochemical Jet Machining of SiC Reinforced Aluminum Matrix Composites
LIU Zhuang, QIU Yi, GUO Chao, GAO Changshui
DOI: 10.16080/j.issn1671-833x.2020.08.038
Silicon carbide reinforced aluminum matrix composites (SiCp/Al) exhibit excellent properties and performance in fields of aerospace, electronic packaging, precision instrumentation and automotive industry. The SiCp/Al composites are hard-to-machining materials due to different physical properties between reinforcement material and matrix material. This study investigated removal mechanism of the reinforcement in abrasive assisted electrochemical jet machining (AECJM) of SiCp/Al composites through simulation and experiments. The results show that the lifetime of the bonding interface between SiC and matrix decreases in several orders of magnitudes with decrease of bonding area. The SiC reinforcement can be extracted out when bonding area drops off to a low level. This results in many micro pits left on the machining surface. The roughness of machining surface is highly relevant to numbers and size of these micro pits. Larger size or higher volume fraction of the reinforcement will result in rougher machining surface.
2020 Vol. 63 (8): 38-45 [
Abstract
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179
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46
Ultra-Precision Grinding Equipment and Technology for Large-Size Optical Aspheric Surface Components
CHEN Dengling, PENG Yunfeng, WANG Zhenzhong, BI Guo, YANG Ping, YANG Wei, SHI Chenchun, GUO Zhiguang
DOI: 10.16080/j.issn1671-833x.2020.08.046
To meet the demand of ultra-precision machining for large-size optical components, the research group further developed high-precision surface grinder UPG80 on the basis of the two self-developed grinders, MK7160 and 2MK1760. Compared with most existing large-caliber surface grinders and MK7160, 2MK1760 grinders, UPG80 used more advanced key supporting technology, including hydrostatic support technology, grinding wheel dressing technology and intelligent monitoring system. In this paper, the static accuracy of UPG80 grinder was tested, and a three-axis error model was established to compensate the error of the grinder. On this basis, the optical components with 530mm×530mm diameter were machined by diamond circular arc grinding wheel, and good processing effect was obtained, which verifies the reliability of the grinder
2020 Vol. 63 (8): 46-53 [
Abstract
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189
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54
Research on Cutting Force and Partition of Chip-Forming Area During Plunge Milling of Aluminum Alloy
ZHOU Jingwen，QIN Wenjin，REN Peiqiang
DOI: 10.16080/j.issn1671-833x.2020.08.054
The influences of spindle speed, feed rate and radial cutting width on cutting forces were analyzed during the orthogonal plunge milling experiment of aluminum alloy. Analysis of variance was carried out and multiple linear regression equations of the cutting parameters were established at the same time. The influences of machining chatter on the signal of cutting forces were discussed. The relationships of cutting forces, tool engage angle and instantaneous chip thickness were analyzed which contributes to dividing the cutting zone into squeezing area, scratching area and cutting area.
2020 Vol. 63 (8): 54-60 [
Abstract
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173
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61
Simulation and Experiments of Abrasive Assisted Electrochemical Jet Machining of SiC Reinforced Aluminum Matrix Composites
LIU Zhuang, QIU Yi, GUO Chao, GAO Changshui
DOI: 10.16080/j.issn1671-833x.2020.08.061
Silicon carbide reinforced aluminum matrix composites (SiCp/Al) exhibit excellent properties and performance in fields of aerospace, electronic packaging, precision instrumentation and automotive industry. The SiCp/Al composites are hard-to-machining materials due to different physical properties between reinforcement material and matrix material. This study investigated removal mechanism of the reinforcement in abrasive assisted electrochemical jet machining (AECJM) of SiCp/Al composites through simulation and experiments. The results show that the lifetime of the bonding interface between SiC and matrix decreases in several orders of magnitudes with decrease of bonding area. The SiC reinforcement can be extracted out when bonding area drops off to a low level. This results in many micro pits left on the machining surface. The roughness of machining surface is highly relevant to numbers and size of these micro pits. Larger size or higher volume fraction of the reinforcement will result in rougher machining surface.
2020 Vol. 63 (8): 61-67 [
Abstract
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145
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419
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APPROACHING SCIENCE
68
Focus on Common Key Technologies to Promote Industry Technological Progress
2020 Vol. 63 (8): 68-69 [
Abstract
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133
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238
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RESEARCH
70
Research and Practice of Digital Manufacturing Technology Based on Model-Driven Civil Aircraft
LAI Yunfeng，LI Wanli
DOI: 10.16080/j.issn1671-833x.2020.08.070
The new generation of turboprop regional civil aircraft is constructing a fully digital development system with typical features of model data-driven, design and manufacturing integration. The technology of constructing and transmitting manufacturing process data with model as the core is becoming a new mode for the development of regional civil aircraft in our country. This paper introduces the certain type of domestic civil aircraft manufacturing business model and collaborative platform architecture, and introduces the concrete practice content and results of model-driven thoughts in domestic commercial digital manufacturing technology application, meanwhile the future application trend is prospected
2020 Vol. 63 (8): 70-76 [
Abstract
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206
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77
Experimental Study on Adhesive Joints With J299 Film Under Different Environments
LEI Anmin，DENG Fanchen，ZOU Peng
DOI: 10.16080/j.issn1671-833x.2020.08.077
The tensile shear experiments of two types of single-lap composite joints processed respectively by T700 and ZT7H fibers under three different environments are carried out to investigate the influence of different environments on shear strength of adhesive joints with J299 film. The experimental results proved that: The shear strengths of T700 and ZT7H adhesive joints in Elevated Temperature Wet (ETW) environment are respectively about 78% and 79% of that in Room Temperature Dry (RTD) environment, and the shear strengths in Cold Temperature Dry (CTD) environment are about 1.11 times and 1.04 times of that in RTD environment. Moreover, in RTD, CTD and ETW environments, the shear strength of ZT7H adhesive joints is 1.32 times, 1.23 times and 1.34 times of that of T700 adhesive joints.
2020 Vol. 63 (8): 77-79，86 [
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172
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80
Research on Deflection Control of Shape Memory Alloy Bump
CHEN Xing，ZHANG Chen，JI Hongli，QIU Jinhao
DOI: 10.16080/j.issn1671-833x.2020.08.080
The shock control bump (SCB) is a passive method of reducing shock drag. Aiming at the deflection-changing bump mentioned in recent years, a shape memory alloy (SMA) bump with two-way memory effect was proposed, which can change deflection by controlling temperature, optimizing the drag reduction performance of SCB. In order to achieve the goal of precise control of deflection, a temperature–deflection hysteresis model based on Preisach theory was proposed. PID control based on the model was conducted, the experimental results show that the model can be applied to the deflection control of SMA bumps, the maximum relative error of the four target points in the experiment is 5.17%, which is better than the PID control without this model.
2020 Vol. 63 (8): 80-86 [
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144
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87
Effects of Trace Element on Properties of Sn–3.5Ag–0.7Cu Lead-Free Solder
KOU Lulu, QU Wenqing, ZHUANG Hongshou
DOI: 10.16080/j.issn1671-833x.2020.08.087
By adding the trace elements such as In, Ge and Ce to the Sn–3.5Ag–0.7Cu solder, the effects on the melting point, oxidation resistance, interfacial compound thickness and joint properties of the solder were investigated. The results show that the addition of trace In can effectively reduce the melting point of the solder (5–7℃), but it is not conducive to the oxidation resistance of the solder. The addition of trace Ge and Ce to SnAgCuIn can effectively improve the oxidation resistance of the solder. The addition of trace elements of In, Ge and Ce reduces the probability of the solder producing compounds at the Cu matrix interface and has little effect on the joint strength. The Sn–3.5Ag–0.7Cu–1In– 0.05Ge–0.03Ce solder has the best overall performance, with a solidus line reduction of 5.9℃ and a liquidus reduction of 3.9℃, meanwhile has good oxidation resistance. The interfacial compound thickness was reduced by 36.6% compared to the SnAgCu solder, and the compound thickness was reduced by 23.0% after 20 days of aging.
2020 Vol. 63 (8): 87-92 [
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145
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93
Analysis of Influencing Factors on Hot Diaphragm Forming for Composite C Spar
LI Lulu，REN Yahui， SUN Songqiang，WANG Yu
DOI: 10.16080/j.issn1671-833x.2020.08.093
Hot diaphragm forming technology has become an automatic manufacturing method for C spar components in the large aircraft abroad, and more and more researches on hot diaphragm forming has been done. In the hot diaphragm forming process of equal cross section and gradual lamination C spar, wrinkle defects are often occurred. According to the principle of hot diaphragm forming, three kinds of comparative materials at home and abroad, two kinds of C spar models, were used to study the temperature, pressure, material, multiple hot diaphragm and the laying form of hot diaphragm through the technological experiments of different thickness, temperature and pressure. The experimental results show that the pre-molding temperature should be kept at 65℃, the holding time is not less than 15min, and the pressure of multiple hot diaphragm is not more than 6kPa/min, which can effectively inhibit the formation of folds. At the same time, the slip between layers of the embryo prepared by wire laying process is more uniform in the hot diaphragm. The related research provides a preliminary theoretical basis for the hot diaphragm molding of domestic large aircraft.
2020 Vol. 63 (8): 93-100 [
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207
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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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