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2021 Vol. 64, No. 7 Published: 2021-04-01

FEATURE FORUM RESEARCH C0NTENTS COVER STORY APPROACHING SCIENCE

FEATURE

	14	State-of-the-Arts of Thermo-Mechanical Coupling Behavior in Linear Friction Welding Process
		GENG Peihao，QIN Guoliang
		DOI: 10.16080/j.issn1671-833x.2021.07.014
		As a typical solid-state joining technology, the linear friction welding (LFW) process has gradually been the key manufacturing technology of bladed discs in advanced aircraft engines because of its advantages of environmental friendly, high efficiency and high quality. In linear friction welding process, the mechanical energy was transformed to heat energy by means of alternative friction, and make the materials reach to the plastic state and be welded, in which, thermomechanical coupling is the basis of the linear friction welding process and determines the microstructures and properties of the joint. The inherent characteristics of thermo-mechanical coupling behavior in LFW, and the corresponding numerical simulation methods are introduced, and a more comprehensive literature review of the state-of-the-arts of thermomechanical coupling of the LFW process is summarized, which can provide the guidelines for the studies on thermomechanical coupling behaviors in LFW. Finally, the problems and development prospects of numerical simulation of thermo-mechanical coupling in LFW are discussed to provide some ideas for the future research.
		2021 Vol. 64 (7): 14-27 [Abstract] ( 183 ) HTML^New PDF (11179 KB) ( 101 )

COVER STORY

	28	Research Review on Surface Modification With Water Jet Peening Technology
		MA Yongtao, ZHAI Linbang, ZHU Zehua, ZHANG Yongbin, LIU Lanrong, MA Shenggang
		DOI: 10.16080/j.issn1671-833x.2021.07.028
		Using water jet peening to strengthen local area of high-hardness carburized and quenched parts is a promising technology for surface modification. This paper focuses on the application of surface layer modification, and introduces the characteristics and applications of pure water jet, injection and suspension water jet in turn. On the basis of comprehensively comparing the characteristics of various jets, it is proposed that the suspension water jet is an ideal jet method in surface modification, and the problems existing in the modification of the suspension water jet peening are discussed. The jet formation, parameter measurement, nozzle shape and service life need to be further studied. Moreover, the surface integrity of modified layer, the fine process after water jet peening, the effective modification of high stress concentration area, the continuity of the formation of jet, and stability and other issues need to be concerned. On the basis of solving the above-mentioned mechanism problems, as well as improving the jet modification equipment, engineering application research on specific parts such as gears, blades, and spline shafts can be carried out.
		2021 Vol. 64 (7): 28-35 [Abstract] ( 196 ) HTML^New PDF (2906 KB) ( 504 )

FORUM

	38	Research Progress of Surface Integrity in Robotic Compliant Grinding of Superalloys
		HUANG Xiaokang, REN Xukai,CHEN Huabin,WANG Hao,CHEN Xiaoqi
		DOI: 10.16080/j.issn1671-833x.2021.07.038
		Compliant grinding has been a focus in the field of grinding in recent years, and is widely utilized in grinding/polishing aeronautical superalloy components. Considering the decisive effect of surface integrity on components’ quality and performance, in–depth understanding of the surface integrity resulting from compliant grinding of the high-performance materials has great significance to the aerospace industry. The paper summarizes the manufacturing characteristics and system composition of robotic compliant grinding, especially the model and algorithm of intelligent control. It then reviews important evolution mechanism and theoretical modeling of surface integrity from three aspects including surface morphology, stress state and microstructure. Furthermore, the effects of surface integrity on fatigue strength and anti-corrosion performance of superalloy components are discussed. Finally, research directions of surface integrity in robotic compliant grinding of superalloys are presented.
		2021 Vol. 64 (7): 38-52 [Abstract] ( 173 ) HTML^New PDF (18300 KB) ( 341 )

	53	Research Status and Future Development of Wheel Loading and Suppressed in Grinding of Ductility Aeronautical Alloys
		GAO Binhua,BAO Wencheng,CHEN Chaoqun,JIN Tan,SHANG Zhentao
		DOI: 10.16080/j.issn1671-833x.2021.07.053
		Grinding is a significant approach to realize the machining of high performance and precision parts. However, the wheel loading phenomenon seriously restricts the application of grinding technology in the precision manufacturing of ductility aeronautical alloys components. The recent advances in this field are reviewed in this paper. Firstly, the mechanism of adhesive wear and wheel loading are comprehensively elaborated, and the effective factors of wheel loading are identified. The adverse effects that wheel loading brings on the grinding force and grinding temperature as well as the work piece surface quality after grinding are analyzed. Subsequently, the research actuality of the wheel loading modelling is presented. Meanwhile the limitations of application of these models are analyzed. Then, the recent advances of the suppression technology of wheel loading are described, which includes research on the selection of grinding parameters, the improvement of cooling and lubricating conditions in grinding zone, the structure design of grinding wheel, the in– process cleaning and dressing technology and electrochemial grinding. Finally, the research direction of wheel loading issue in the future is prospected from the viewpoint of engineering application.
		2021 Vol. 64 (7): 53-71 [Abstract] ( 119 ) HTML^New PDF (15678 KB) ( 90 )

	72	Review on Precision Grinding of Internal Threads
		LI Shuai,WU Guicheng, AN Yuquan,GUO Bing,ZHAO Qingliang,WU Wenwei
		DOI: 10.16080/j.issn1671-833x.2021.07.072
		Mainly aimed at the precision grinding processing technology of internal thread, the research results of the existing internal thread grinding processing technology are introduced from the aspects of grinding wheel section design, grinding rod research, grinding wheel dressing and grinding technology. The advantages and disadvantages of the grinding wheel section design analysis method and the computer aided design method are analyzed. The method of reducing the vibration of the internal thread grinding rod and improving the dressing accuracy of the internal thread grinding wheel is briefly described. The research on tool setting, process parameters, ultrasonic vibration assisted grinding and grinding force in the process of internal thread processing is introduced. The development status of internal thread grinding processing technology is summarized, and the future development direction of internal thread grinding processing technology is prospected.
		2021 Vol. 64 (7): 72-80 [Abstract] ( 149 ) HTML^New PDF (9222 KB) ( 70 )

	81	Grinding Performance and Parameter Optimization of Nickel-Based Superalloy K4125
		WANG Kechang,YI Peng, ZHU Yejun,DING Wenfeng
		DOI: 10.16080/j.issn1671-833x.2021.07.081
		The guide blade is mainly composed of nickel-based superalloy K4125, which is a typical difficult-tocut material. The understanding of grinding performance of K4125 can help to optimize the grinding process parameters and improve the material removal efficiency. In this article, the material property difference between K4125 and GH4169 is discussed firstly. Then, the grinding experiments are carried out. The grinding performances are compared on the basis of grinding force, grinding temperature, specific energy and surface roughness. The results show that the grinding force of K4125 is always higher than that of GH4169. The grinding temperature of K4125 is over 400 ℃ , while the grinding temperature of GH4169 is lower than 200℃. Nevertheless, the phenomena of coating and redeposited chip on the ground surface of K4125 are more serious than that of GH4169. The size of the striation on the ground surface of K4125 is larger and the surface roughness of K4125 is larger. The grindability of K4125 is poorer than that of GH4169. The optimal grinding parameters is selected as follows: grinding wheel speed vs =25~30m/s, infeed speed vw =500~1000mm/min, grinding depth ap = 0.01~0.02mm.
		2021 Vol. 64 (7): 81-87 [Abstract] ( 199 ) HTML^New PDF (5227 KB) ( 240 )

APPROACHING SCIENCE

	88	Aligning With Quality Control and Safety Evaluation of Major Projects, Developing New Non-Destructive Testing Technology


		2021 Vol. 64 (7): 88-89 [Abstract] ( 194 ) HTML^New PDF (778 KB) ( 293 )

RESEARCH

	90	Study on Optimization of Grinding Process Parameters of Monocrystalline Silicon Lens
		WANG Yaji,SUN Yuli,MO Honglei,YUAN Hang,ZHU Limin,LU Bo,GUO Lingxi
		DOI: 10.16080/j.issn1671-833x.2021.07.090
		Aimed at the aspheric monocrystalline silicon lens widely used in the field of infrared optics, the processing technology of aspheric normal grinding was studied. Through orthogonal experiment, the influence of process parameters such as wheel speed, grinding depth and feed speed on the surface roughness and material removal rate of aspheric surface grinding was studied. Through grey correlation analysis, a group of process parameters optimized for the surface roughness and material removal rate of normal grinding was obtained. The results show that, by increasing the rotation speed of the grinding wheel, the surface roughness of the aspheric surface can be significantly reduced, and the uniformity of the surface roughness distribution of the aspheric surface can be improved. Through the grey correlation analysis, the double objective optimization of the surface roughness and the material removal rate of the aspheric normal grinding can be realized, which can not only improve the surface quality of the aspheric components, but also has a certain degree of machining efficiency. The normal grinding method tends to form helix and radial grinding marks on the aspheric surface. The grinding marks could affect the distribution uniformity of surface roughness, so it is supposed to pay attention to restraining the generation of grinding marks.
		2021 Vol. 64 (7): 90-94 [Abstract] ( 156 ) HTML^New PDF (1393 KB) ( 271 )

	95	Research on Control Method of Blade Adjoining Error in Machining Operation of Closed Blisk
		QIU Wenwang, YANG Jiping, WANG Yongfei, SUN Jing, LUO Yuanfeng
		DOI: 10.16080/j.issn1671-833x.2021.07.095
		As the machining operation of closed blisk in 5-axis machine tool is a highly comprehensive process, the blade adjoining error is influenced by many factors such as machine tool, fixture, workpiece, clamping process, cutting parameters, workers and so on. Based on analyzing the formation mechanism of blade adjoining error, this paper presents a machining process flow for closed blisk and proposes a high-accuracy positioning method of workpiece as well as a quick calibration procedure of machine tool zero point by using machine tool probe. The verification experiment demonstrates that the presented strategy could control the blade adjoining error in machining operation of closed blisk effectively.
		2021 Vol. 64 (7): 95-102 [Abstract] ( 131 ) HTML^New PDF (2655 KB) ( 352 )

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