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2020 Vol. 63, No. 13 Published: 2020-07-01

FEATURE FORUM RESEARCH C0NTENTS COVER STORY APPROACHING SCIENCE

FEATURE

	14	New Method of Ultrasonic Slotting Nomex Honeycomb Core With Semi-Circle Arc Tool
		KANG Renke, HAN Kun, WANG Yidan, MENG Qian, DONG Zhigang
		DOI: 10.16080/j.issn1671-833x.2020.13.014
		Nomex honeycomb core is a kind of typical difficult-to-cut materials because of the characteristics of anisotropy and weak-stiffness. Aimed at solving the problem of chip removal and serious crushing on the chip side during the processing of Nomex honeycomb core with traditional trepanning tool, a new method of ultrasonic slotting Nomex honeycomb core with semi-circle arc tool was proposed. A new semi-circular arc tool was designed, the kinematic law of the semi-circular arc tool with ultrasonic vibration was analyzed, and the transition mechanism of continuous cutting into intermittent cutting was explained theoretically in ultrasonic cutting. On these basis, ultrasonic slotting tests of Nomex honeycomb core were carried out, and the influences of the amplitude and feed rate on cutting force and cutting quality were studied. The test results showed that satisfied processing results could be obtained by the ultrasonic slotting of Nomex honeycomb core with semi-circle arc tool , and the introduction of ultrasonic could effectively reduce the cutting force and improve the surface quality. The ultrasonic slotting technology of semi-circular arc tool provided a new method for highquality cutting process of the edge contour of the honeycomb core.
		2020 Vol. 63 (13): 14-22 [Abstract] ( 216 ) HTML^New PDF (16634 KB) ( 87 )

COVER STORY

	24	Investigation of Microstructure and Tensile Properties of TC17 Alloy Fabricated by Electron Beam Wire Deposition
		YANG Yang, WU Fan, CHEN Wei
		DOI: 10.16080/j.issn1671-833x.2020.13.024
		The microstructure and tensile properties of TC17 alloy fabricated by electron beam wire deposition (EBWD) were investigated. The as-built EBWD TC17 alloy exhibited a homogeneous element distribution, and the coarse columnar β grains grew epitaxially through many deposited layers along the z direction. Inside each columnar grain there was fine basket-waved microstructure. After hot isostatic pressing (HIP), small α rods formed in the β matrix. In the solution treated and aged material, rod-like α phase and fine α precipitates both existed. The tensile strength and elongation of as-built EBWD TC17 alloy were 935MPa and 9.0%, respectively. The tensile strength and elongation after HIP were 904MPa and 18.0%. After solution treating and aging, the tensile strength increased 18% (to 1066MPa) compare with the HIP condition due to the strengthening effect of fine α precipitates. However, the elongation decreased significantly (to 7.5%) and the ductile dimples on the tensile fracture surface also decreased.
		2020 Vol. 63 (13): 24-29 [Abstract] ( 159 ) HTML^New PDF (26939 KB) ( 87 )

FORUM

	32	Preliminary Study of Laser Surface Modification Techniques for Magnesium Alloys
		HUANG Zeya,GUAN Yingchun
		DOI: 10.16080/j.issn1671-833x.2020.13.032
		Magnesium alloys have the advantages of low density, high specific strength and good biocompatibility, but its poor surface properties limit their further use. Improving corrosion resistance and wear resistance of magnesium alloys through surface modification techniques can expand the application of magnesium alloys. Laser techniques have a significant effect on the surface modification of magnesium alloys and thus being widely used. This paper mainly introduces the three typical laser surface modification techniques including laser surface melting, surface texture and surface cladding. It will analyze the mechanism of surface performance enhancement from the laser-alloy interaction and the evolution of microstructure.
		2020 Vol. 63 (13): 32-39/46 [Abstract] ( 191 ) HTML^New PDF (33110 KB) ( 105 )

	40	Study on Influence of Electron Beam Surfi-Sculpt on Cooling Performance of Liquid-Cooling Cold Plate
		ZHAO Tong,FU Pengfei,TANG Zhenyun,WANG tao,ZHANG Hebin
		DOI: 10.16080/j.issn1671-833x.2020.13.040
		In order to obtain the law of the influence of the electron beam surfi-sculpt on heat dissipation performance of liquid-cooling cold plate, the numerical simulation of liquid-cooling cold plate with cylindrical surfi-sculpt was carried out. The results shows that the cooling performance of the cold plate can be effectively improved when the cylindrical surfi-sculpt is in channel of the cold plate. The height of surfi-sculpt has the greatest influence on the heat dissipation performance of cold plate, and the flow direction spacing has the second influence. The influence of the diameter is the least. When the diameter of the cylindrical surfi-sculpt is 1mm, the height is 6mm and the flow direction spacing of the adjacent surfi-sculpts is 4mm, the temperature difference between the cooling liquid and the simulated heating chip is 46.08 ℃, and the heat dissipation performance of the cold plate can be improved by 23.23% compared with the blank sample. According to the simulation results, the liquidcooling cold plate samples with different surfi-sculpt were prepared. The test results of the heat dissipation performance shows that the heat dissipation performance of the cold plate can be improved by more than 13% when the cylindrical surfi-sculpt is made in the channel. However, when the height of cylindrical surfi-sculpt is less than 4mm and the quantity of surfi-sculpts is a few, the effect of changing the characteristics of surfi-sculpt on improving the heat dissipation performance of cold plate is small.
		2020 Vol. 63 (13): 40-46 [Abstract] ( 156 ) HTML^New PDF (8748 KB) ( 110 )

	47	Experimental and Simulation Study on Laser Shock Peening of Gear Root
		LI Chenlu,XIE Lijing,CHENG Guanhua,LIANG Guoxiang
		DOI: 10.16080/j.issn1671-833x.2020.13.047
		To investigate the influence of the laser shock processing (LSP) on the residual stress of the high-strength steel gear root, ABAQUS software is used to simulate the laser shock processing, and the experimental results are analyzed to verify the accuracy of the simulation model. The results show that this model accurately predicts the distribution of the residual stress on the gear root after LSP, and the law of LSP reflected by the simulation is consistent with the experimental results. According to the distribution of the residual stress, it is concluded that laser shock processing introduces near-surface compressive residual stress which varies in different directions. Specifically, the average value of the compressive residual stress along the gear root is larger than that in the vertical direction.
		2020 Vol. 63 (13): 47-52 [Abstract] ( 156 ) HTML^New PDF (7932 KB) ( 137 )

	53	Study on Microstructure and Properties of Inconel 718 Fabricated by Selective Laser Melting/Hot Isostatic Pressing Hybrid Forming Process
		TENG Qing, SUN Shanshan, XUE Pengju, SHI Yusheng, WEI Qingsong
		DOI: 10.16080/j.issn1671-833x.2020.13.053
		Hot isostatic pressing (HIP) technology can be used to fabricate complex parts with high-performance, however, there are some problems with this technology, such as the difficulty of manufacturing capsule for complex parts and the interface diffusion between heterogeneous capsule and powder, which will harm the performance. For this reason, a study on the selective laser melting (SLM)/HIP hybrid forming process was investigated. XRD, SEM, EBSD and tensile test were used to characterize the matrix / interface microstructure and tensile properties of the hybrid forming process. The results show that there are obvious pores and micro cracks in the matrix of Inconel 718 alloy directly formed by SLM, and the density is 98.3%. After HIP process, the Inconel 718 alloy matrix does not have obvious pores and cracks, but there is obvious prior particle boundary (PPB). Under the hybrid process conditions, the pores and cracks of the Inconel 718 formed by SLM are reduced, the characteristics of the melting track on the X–Y surface disappear, and the degree of anisotropy is reduced. After HIP, there is no obvious diffusion layer between the powder particle and the SLM-formed Inconel 718, and the interface is composed of fine grains with a thickness of about 16.7μm. The 650℃ high temperature strength of the interface is 626MPa. The tensile fracture surface is flat along the SLM and HIP state bonding interface. After solid solution + aging heat treatment, the interface bonding strength is increased to 990MPa, and the fracture is distributed in the SLM forming part. By analyzing the evolution of microstructure and properties, the feasibility of using the hybrid forming process to prepare complex parts is verified.
		2020 Vol. 63 (13): 53-60 [Abstract] ( 116 ) HTML^New PDF (13768 KB) ( 97 )

APPROACHING SCIENCE

	62	Concentrate on Key Technologies and Serve for Industry Needs


		2020 Vol. 63 (13): 62-63 [Abstract] ( 108 ) HTML^New PDF (442 KB) ( 90 )

RESEARCH

	64	Development of Finite Element Simulate Module of ANSYS Workbench on Profile Stretch-Bending
		HAN Zhiren, LUO Xuelei
		DOI: 10.16080/j.issn1671-833x.2020.13.064
		The finite element simulation of the profile bending process is carried out using the existing commercial finite element software, which is prone to problems such as low efficiency of finite element modeling, unreasonable finite element model and high requirements for engineers and technicians. In view of the above problems, this paper studies the finite element simulation of profile bending and analyzes the bending method, geometric modeling, material model, boundary condition setting, clamp trajectory calculation and solving algorithm. Based on the previous research, the geometric modeling module and simulation module of the finite element software ANSYS Workbench were redeveloped, and the corresponding operation template was embedded to realize the geometric model modeling and pre-processing of the finite element simulation of the profile bending. For the specific example, the simulation of the profile finite element modeling module was carried out. The results show that the module developed in this paper can quickly and efficiently complete the finite element simulation of profile bending, and the simulation results are worth to reference.
		2020 Vol. 63 (13): 64-68 [Abstract] ( 156 ) HTML^New PDF (4875 KB) ( 265 )

	69	Lateral Crush Mechanism and Honeycomb Stabilization of Nomex Honeycomb Sandwich Structure
		HAO Xinchao, HU Jie
		DOI: 10.16080/j.issn1671-833x.2020.13.069
		The research status of honeycomb lateral crush mechanism was summarized, and the strength of Nomex honeycomb at 180℃ was tested. On this basis, the mechanical model of honeycomb lateral crush mechanism was established. The analysis shows that: when the conventional honeycomb sandwich structure adopts cocure process, the condition of no honeycomb lateral crush problems is that the inclination angle is no more than 25°, the edge of the fabric prepreg is firmly tied-down, and the honeycomb height should not be too high. The key to solve the honeycomb lateral crush problem is to adopt friction belt to tie-down the edge of prepreg and improve the lateral rigidity of honeycomb. The methods to improve the lateral rigidity of honeycomb including adhesive film method, septum method and pre-curing fabric method. The processing test result shows that: for the conventional honeycomb sandwich structure with a height of 60mm and an inclination angle of 30°, the stabilization effect of adhesive film method is not good, the septum method and precuring fabric method are effective measures to solve lateral crush problem of honeycomb sandwich structure, and the precuring fabric method has the weight advantage over the septum method.
		2020 Vol. 63 (13): 69-74/82 [Abstract] ( 139 ) HTML^New PDF (6731 KB) ( 410 )

	75	Effect of Service Loads on Residual Stresses of Al–Li Alloy T–Joint Using Laser Welding Through FE Analysis
		ZHOU Xudong, WU Youfa, CHEN Shuai, ZHAN Xiaohong
		DOI: 10.16080/j.issn1671-833x.2020.13.075
		This study reveals the evolution rule of welding residual stress of aluminum–lithium alloy skin-stringer T–joint under service load. Firstly, the 3D thermal-structural finite element model of T–joint dual laser-beam doubleside synchronous welding process was established, and the reliability of the model was verified by experiments to obtain accurate welding residual stress. Subsequently, the welding residual stress, strain distribution and total equivalent plastic strain were taken as initial conditions, and the finite element numerical analysis was combined with the elastic-plastic structural model to study the residual stress redistribution of the T–joint under service load. The results show that after the end of the applied load, the longitudinal stress relaxation of the skin is obvious (especially at the weld), and the longitudinal stress in the middle of the stringer is not sensitive to the service load.
		2020 Vol. 63 (13): 75-82 [Abstract] ( 122 ) HTML^New PDF (27466 KB) ( 82 )

	83	Application of Automatic Tape Laying Technology in Quantity Production of Composite Part With Small Size and Low Curvature
		REN Weian, MA Jun, WANG Yuqi, LIU Bin
		DOI: 10.16080/j.issn1671-833x.2020.13.083
		FiberSim software was used for two-dimensional expansion of low-curvature 3D composite parts layer. CATIA was used for two-dimensional layout composing of multi-parts, and completing the redesign of batch manufacturing parts. This paper adopts automatic tape laying (ATL) programming technology to carry out multi-part programming, and finally realized the quantity production of small size and low curvature structural parts through ATL machine. The technique provides a means of quantity production for small size, low curvature structure composite parts, and solves the problems that a large number of small size, low curvature composite components, which can only relied on hand laying, so greatly improves the quality and efficiency of parts manufactures, improves the material utilization, and reduces the manufacturing cost. ATL technology provides a very good new application scenarios for composite manufacturing, and promotes the application and development of ATL.
		2020 Vol. 63 (13): 83-85/91 [Abstract] ( 173 ) HTML^New PDF (3550 KB) ( 292 )

	86	Investigation on Improving Bottom Flatness in Electrochemical Mill-Grinding
		NIU Shen, QU Ningsong, LI Hansong
		DOI: 10.16080/j.issn1671-833x.2020.13.086
		The effect of the tool-bottom insulation layer on machining performance in electrochemical mill-grinding is investigated by performing the bottom insulation design for a tool substrate with both the outer diameter and the cutting depth of 10mm. The results show that it can significantly improve the overcut, flatness and surface quality of the slot bottom by using the abrasive tool with bottom insulation. Under an applied voltage of 30V, a cutting depth of 10mm and a feed rate of 2.7mm/min, etc, the average slot depth, the maximum difference in bottom profile coordinates and the surface roughness obtained with the uninsulated tool are 10.61mm, 783.9μm and 1.705μm, but they are only 10.32mm, 352.5μm and 0.811μm with the insulated tool, respectively.
		2020 Vol. 63 (13): 86-91 [Abstract] ( 101 ) HTML^New PDF (24763 KB) ( 74 )

	92	Research on Application of Micro-Hole Drilling Technology in Processing of Aero-Engine Fuel Nozzles
		SHI Hongguo, WANG Fuhai, DING Zhichun, LEI Liming
		DOI: 10.16080/j.issn1671-833x.2020.13.092
		Fuel nozzle is a major component of engine combustion chamber, the main function of which is to supply fuel with suitable quantity and good atomization quality according with different working conditions. The Processing quality of micro-hole nozzle is the key parameter which could ensure the requirement of engine thrust and affect the efficiency of combustion chamber and the performance of engine. This paper introduces the structure features of the main injector, and applies the micro-hole drilling in the main injector. By analyzing the characteristics of the micro-hole drilling system, it summarizes cutting parameters that meets the requirements of the main nozzle, advances an inner cavity burr control method. The machining technology described in this paper has been applied in practical production.
		2020 Vol. 63 (13): 92-96 [Abstract] ( 196 ) HTML^New PDF (2297 KB) ( 335 )

	97	Research of Bolt Pre-Tightening Technology in Narrow Space for Spacecraft Integration
		SONG Xiaohui, LIU Zhibin, XUE Feng,GU Lei
		DOI: 10.16080/j.issn1671-833x.2020.13.097
		Bolt joint is the main form of spacecraft structure assembly. This paper aimed at the problems that standard torque spanner is not suitable to tightening torque, analyzed and summarized two causes. One reason is caused by limited axial space of fasteners, the other reason is limited radial space of fasteners. Based on thorough analysis of fastening principles and principle of type serialization, a scheme of integrated L-shaped is established. The results of experimentation indicate that the scheme of integrated L-shaped lever is reasonable along with the requirement of developing long-life and high reliability spacecraft. Therefore the stability of fasteners is greatly enhanced.
		2020 Vol. 63 (13): 97-101 [Abstract] ( 172 ) HTML^New PDF (2289 KB) ( 308 )

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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