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2020 Vol. 63, No. 10
Published: 2020-05-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
FEATURE
14
Research and Application Progress of Laser Metal Deposition
YANG Jiaoxi,KE Hua,CUI Zhe,LIU Qi, LI Huaixue, ZHOU Zheng,XIAO Junheng, ZHANG Zhiyong
DOI: 10.16080/j.issn1671-833x.2020.10.014
Additive manufacturing is an advanced manufacturing technology that combines materials science, machanical automation and information technology. It has played an increasingly important role in the past 30 years of development. Laser metal deposition (LMD) is an additive manufacturing technology based on directed energy deposition (DED), which has received widespread attention in recent years. The basic operation principle and system composition of LMD technology were described. The research progress and application status of LMD technology at home and abroad were mainly introduced. Some LMD-based technology development and equipment manufacturing were listed. The shortcomings of LMD technology in forming efficiency, forming precision, process stability and performance consistency were pointed out. Finally, Five development trends of LMD technology were summarized : Intensification of material system; Systematic analysis of technological parameters; Improve forming efficiency; Intelligent integrated device control, Expansion of application areas.
2020 Vol. 63 (10): 14-22 [
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802
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COVER STORY
24
Status and Future of Topology Optimization for Additive Manufacturing
ZHU Jihong, ZHOU Han,WANG Chuang, ZHOU Lu,YUAN Shangqin, ZHANG Weihong
DOI: 10.16080/j.issn1671-833x.2020.10.024
Additive manufacturing builds as-designed structures via layer-by-layer joining material, providing an alternative manufacturing pattern for complex components. In contrast to conventional structural design concept, topology optimization is independent on initial configuration and can obtain more innovative configurations, and has been a significant approach for high-performance and lightweight structures in the aerospace and high-end equipment field. The integration of topology optimization and additive manufacturing can make the most of their respective advantages and potentials, and has broad application prospects in modern manufacturing. This article reviews the main research content and applications of the integration of additive manufacturing and topology optimization in recent years, including multi-scale/ hierarchical structural optimization design centering on material and structure integration, and topology optimization for additive manufacturing limits centering on design and manufacturing integration. Meanwhile, the problems and challenges of structural design approaches and additive manufacturing process are presented, such as the performance characterization as well as scale effects of additive manufactured lattice structures, the anisotropy of additive manufactured material, the fatigue performance of additive manufactured material, additive manufactured functionally graded material and structure, etc., which provides references for tomorrow’s related research and aerospace applications.
2020 Vol. 63 (10): 24-38 [
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639
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FORUM
42
Application of Laser/Electron Beam Additive Manufacturing for Civil Aircraft Landing Gear
LUO Linyin,JIANG Wu,HAO Xiaoning,LIU Dong,FENG Kangtun,YANG Fan
DOI: 10.16080/j.issn1671-833x.2020.10.042
Additive manufacturing is one of the development directions of advanced manufacturing technology. The application of civil aircraft additive manufacturing technology depends on the maturity of additive manufacturing technology, airworthiness verification technology and the perfection of material standard system. In this paper, A–100 and TC18 materials used in the typical structure of landing gear of civil aircraft are studied in the application of laser / electron beam additive manufacturing technology, and a material and process certification, mechanical property characterization, internal quality control and nondestructive testing evaluation system meeting the airworthiness requirements is established.
2020 Vol. 63 (10): 42-47/55 [
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369
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56
Research Development on Microstructure and Properties of LAM TC4 Titanium Alloy With Different Heat Treatment Processes
WANG Puqiang, WU Mengjie,WANG Yuyue,XIE Ruidong,ZHANG Anfeng
DOI: 10.16080/j.issn1671-833x.2020.10.056
Due to the particularity of processing of LAM (Laser Additive Manufacturing) TC4 titanium alloy, the alloy has obvious anisotropy in mechanical properties, and its toughness and fatigue properties cannot meet the requirements of use. Based on the relationship between the microstructure and mechanical properties of materials, this review introduces the influence of different heat treatment processes on the microstructure and mechanical properties of LAM TC4 titanium alloy, points out the existing problems in the heat treatment research of LAM TC4 titanium alloy, and provides thoughts and direction for the following heat treatment research of LAM TC4 titanium alloy.
2020 Vol. 63 (10): 56-65 [
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363
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66
Chemical Polishing of Titanium Alloy Shaped by Laser Additive Manufacturing
LI Xiaodan,LI Jianzhong,NI Jiaqiang,ZHANG Yingwei
DOI: 10.16080/j.issn1671-833x.2020.10.066
The shaped Ti–6Al–4V alloy parts manufactured by laser additive technology were polished using HNO3- HF chemical solution. Influences of temperature and time on the polishing effects of titanium alloy were investigated by taking the surface roughness, thinning and weight loss as indicators. The electrochemical and mechanical properties of titanium alloys before and after chemical polishing were analyzed by the electrochemical measurement, tensile test and residual stress test. The results showed that favorable polishing effect of the titanium alloy was achieved at polishing conditions of 30°C and 10 minutes, and the surface roughness reduced and corrosion resistance improved. After chemical polished, the strength of titanium alloy decreased slightly, and the residual stress of samples transformed from the tensile stress to a compressive stress.
2020 Vol. 63 (10): 66-71 [
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310
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72
Development and Application of Metal Additive Manufacturing in Aerospace Field
DOI: 10.16080/j.issn1671-833x.2020.10.072
With the restriction of tradition manufacturing process, there are some problems on long production cycle, high production cost, difficulty in reducing weight and so on. It is vital to develop the manufacturing method of aerospace product efficiently and quick. Comparing with the tradition manufacturing process, additive manufacturing technology is a new direction in manufacturing technique field by distinct manufacturing idea. The main contents include the description and the superiority of additive manufacturing technology, and the in-depth research, the achievement apply on metal additive manufacturing (laser/electron beam/electric arc).
2020 Vol. 63 (10): 72-77 [
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415
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APPROACHING SCIENCE
78
Integrating Additive Manufacturing and Innovative Design to Promote Manufacturing Industry and Disciplines
2020 Vol. 63 (10): 78-79 [
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271
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RESEARCH
80
KNN-Based Tool Tip Frequency Response Function Prediction Method
ZHANG Yunfei,HAO Xiaozhong,CHEN Gengxiang, LIU Xu
DOI: 10.16080/j.issn1671-833x.2020.10.080
Chatter in machining usually results in poor surface finish, reduces the life of machine tools and damage on cutters, and chatter suppression has always been the focus of academia and industry. The stability lobe diagram (SLD) based on the tool tip frequency response function (FRF) is the important basis for the existing chatter suppression methods. The impact test method is the most accurate method for obtaining the tool tip FRF, however, in application scenarios where the structure of the machine tool changes frequently, the efficiency of this method is not satisfactory. Therefore, a KNNbased tool tip FRF prediction method is proposed in this paper, which combines the impact test method with the KNN algorithm, there by greatly reducing the time consumption of the impact test method and accurately obtaining the tool tip FRF. In experimental verification, this method is compared with the RCSA method, and the results show the accuracy of the proposed method.
2020 Vol. 63 (10): 80-88/96 [
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233
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89
Optimization of Argon Arc Welding Parameters Based on Cloud Ant Colony Algorithm for High Efficiency and Energy Saving
XIAO Xi,CAI Xulin,LAI Mingbo,LI Ruiling,HE Jiannan,ZHANG Jianwei
DOI: 10.16080/j.issn1671-833x.2020.10.089
To improve the efficiency of argon arc welding and reduce the energy consumption, a multi-objective optimization model and algorithm of high efficiency and energy saving process parameters were studied. Firstly, taking welding speed and welding current as optimization variables, and considering the constraints of welding equipment, workpiece characteristics, operation method and welding quality, a multi-objective process parameter optimization model with the minimum power consumption and the shortest processing time as optimization objectives was established. Put forward a kind of ant colony algorithm based on cloud model (CBACO) to solve the optimization of the constructed model, which contains an appropriate encoding method, a combination of local and global exploration strategy, a mutation factor based on cloud model, the traditional single point crossover factor, simplex crossover factor and the choice of appropriate strategies; Through a welding example of an aircraft fuel tank, the practicability of the optimization model and algorithm proposed in this paper is verified. The results show that the optimized parameters can effectively save time 60.41%–69.05% and energy 34.88%–46.30% under the premise of guaranteeing the processing quality.
2020 Vol. 63 (10): 89-96 [
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271
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97
Study on Method for Raising Hot Riveting Qualification Rate of Titanium Alloy Rivet
LIU Chun, LAN Yulong, ZHAN Youhe, GOU Desen
DOI: 10.16080/j.issn1671-833x.2020.10.097
Aiming at the problems existing in hot riveting of titanium alloy rivets, such as insufficient forming of rivet upsetting head, surface burns of rivet upsetting head and rivet head oxidation, the main reason was found to be inaccurate control of riveting heating time and electriferous riveting process. An optimization method of hot riveting system for titanium alloy rivets was proposed. The function of heating time parametric control and automatic power cut-off before riveting was realized based on PLC. Data of rivet temperature and corresponding heating time were obtained by rivet heating test. Heating time required for rivet to reach target temperature was obtained through Newton interpolation method. A set of hot riveting process parameters for rivets of different lengths and diameters was formed. Finally, the qualified rate of hot riveting of titanium alloy rivets was greatly improved through the hot riveting test.
2020 Vol. 63 (10): 97-100 [
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277
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