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Hardening mechanism and thermal-solid coupling model of laminar plasma surface hardening of 65 Mn steel

Plasma Science and technology 2024年第12期26卷 110-120页

作者： Xiuquan CAO Lin WANG Haoming XU Guangzhong HU Chao LI Sichuan University of Science&Engineering Yibin 644000People’s Republic of China Chengdu University of Technology Chengdu 610059People’s Republic of China Key Laboratory of Advanced Manufacturing Technology of Panzhihua City Panzhihua 617000People’s Republic of China

In the present work,the laminar plasma surface hardening method is employed to enhance the service life of metal components fabricated from 65 Mn *** mechanical and wear behaviors of the laminar plasma surface hardened 65 Mn steel were *** martensite transition transformation of the temperature of the laminar plasma-hardened 65 ferrite Mn steel was determined by a thermal-solid coupling *** on the orthogonal experimental results,the optimal hardening parameters were *** scanning velocity,quenching distance and arc current are 130 mm/min,50 mm and 120 A,*** pearlites and ferrites are transformed into martensites in the hardened zone,while the ratio of martensite in the heataffected zone decreases with the increase in the hardening *** to the untreated 65Mn steel,the average hardness increases from 220 HV_(0.2)to 920 HV_(0.2)in the hardened zone and the corresponding absorbed power increases from 118.7 J to 175.5 *** the same time,the average coefficient of friction(COF)decreases from 0.763 to 0.546,and the wear rate decreases from 5.39×10^(-6)mm^(3)/(N·m)to 2.95×10^(-6)mm^(3)/(N·m),indicating that the wear resistance of 65Mn steel could be significantly improved by using laminar surface *** the same hardening parameters,the depth and width of the hardened zone predicted by the thermal-solid coupling model are 1.85 mm and 11.20 mm,respectively,which are in accordance with the experimental results;depth is 1.83 mm and width is 11.15 *** addition,the predicted hardness distributions of the simulation model are in accordance with the experimental *** results indicate that the simulation model could effectively predict the microstructure characteristics of 65 Mn steel.

关键词： 65 Mn steel laminar plasma surface hardening hardening mechanism microstructure characteristics thermal-solid coupling model

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Recent Patents on Thermal Characteristic Analysis and Modeling of Machine Tools

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Recent Patents on Engineering 2024年第5期18卷 133-145页

作者： Li, Zhaolong Du, Junming Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China School of Mechanical and Power Engineering Harbin University of Science and Technology Heilongjiang Province Harbin150080 China

Modern machining machines are becoming more sophisticated and automated, but the problems of thermal deformation caused by machining have also come to the fore. CNC machine tools are used in high-speed, high-feed rate machining conditions, so the impact of thermal deformation factors will lead to a more prominent loss of accuracy. In this context, the design and manufacture of future CNC machine tools need to take further account of the errors caused by thermal deformation and the accompanying loss of accuracy. The principle of thermal characterisation and thermal error modeling of machine tools is to measure and reasonably analyse the machine tool at different temperature points and make corrections to the analysis data in order to get a value as close as possible to the real value and improve machining accuracy. Several representative patents and studies on thermal characterisation and thermal error modeling of machine tools at home and abroad are reviewed. This study presents a selection and summary of a large number of recent patents and studies on machine tool thermal characterisation and thermal error modeling, focusing on the selection of the machine tool thermal error measurement point area, thermal error modeling methods, spindle thermal displacement compensation, and other aspects, and discusses the future trends in the mainstream methods for reducing the thermal error of machine tools. The analysis and modeling of thermal errors in machine tools have an integral influence on further improvements in machining accuracy and efficiency in the future. © 2024 Bentham Science Publishers.

关键词： Machine tools

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Lithography-free polarization-dependent absorber based on α-MoO_(3)

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Science China(Technological Sciences) 2024年第7期67卷 2147-2152页

作者： HU Yang WU XiaoHu LI HongJu ZHAO Yi LIU HaoTuo HUANG XiuQuan School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Shandong Institute of Advanced Technology Jinan 250100China School of Physics Hefei University of TechnologyHefei 230009China Department of Academic Affairs Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China

As a natural biaxial hyperbolic material, α-phase molybdenum trioxide(α-MoO_(3)) exhibits dielectric and metallic properties in the plane, rendering it an exceptional candidate for polarization-dependent devices. In this work, we design a lithography-free polarization-dependent absorber consisting of an α-MoO_(3)film, a germanium layer, and a silver substrate. The results show that a narrowband absorption of up to 0.99 is achieved at a wavelength of 12.2 μm for transverse magnetic polarization. In contrast, the absorption is only 0.06 at this wavelength for transverse electric polarization. This remarkable polarization-dependent absorption performance is attributed to the coupling of epsilon-near-zero modes and Fabry-Perot resonances, which is confirmed by the electric field and power dissipation density distributions. Furthermore, strong polarization-dependent performance could also be achieved when the crystal axis of α-MoO_(3)is rotated in the out-of-plane. This work demonstrates that in-plane anisotropic α-MoO_(3)has the potential for designing high polarization-dependent devices.

关键词： α-MoO_(3) polarization-dependent epsilon-near-zero modes Fabry-Perot resonances

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Overview of Electric Spindle Cooling Patents

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Recent Patents on Engineering 2024年第10期18卷 66-82页

作者： Bao, Yudong Cui, Guanhua Zhou, Zhentao School of Mechanical and Power Engineering Harbin University of Science and Technology Heilongjiang Province Harbin150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China

Background: With the increase in the motorized spindle speed, the heating problem of the spindle has become a key factor affecting machining accuracy and efficiency. Because of this, the patent technology related to cooling the main shaft is being analyzed. Aiming at technical problems, such as temperature rise control due to the high speed of motorized spindle and its structural integration, this paper systematically analyzes and deeply summarizes the existing cooling technology achievements for high-speed motorized spindles, expounds the cooling technology for key components of these high-speed motorized spindle, and discusses the application of a more economical and effective cooling technology for engineering in junior high school to overcome future challenges. The paper also forecasts future development trends. The heating caused by the highspeed rotation of the motorized spindle motor and the friction-induced heating of the bearings are inevitable. After the temperature rise, the relative position and size of the spindle and other parts or components of the machine tool will differ from that before the temperature rose, forming different temperature fields and then producing different degrees of thermal expansion, leading to processing errors. This paper analyzes the characteristics and application scenarios of various cooling mechanisms for motorized spindles. Objective: By analyzing and discussing the patents related to the cooling methods of motorized spindles, this study aims to explore the factors of temperature variation during the working process of the motorized spindle and seeks to predict future research and development in motorized spindle cooling equipment. Methods: The present status of various representative patents related to the cooling device of the motorized spindle was analyzed, and the influence of the cooling device of the motorized spindle on the working effect of the spindle was obtained. According to the classification of the characteri

关键词： Thermal variables control

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UAV Remote Sensing technology: A Review of Chinese Agricultural Patents

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Recent Patents on Engineering 2024年第4期18卷 113-134页

作者： Bao, Yudong Huang, Yongqi Liu, Yuying School of Mechanical and Power Engineering Harbin University of Science and Technology Heilongjiang Province Harbin150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China

Background: With the progress of science and technology and the advent of the new era, UAV remote sensing technology has developed rapidly in recent years and the application fields have been increasing. UAV remote sensing technology is widely used in the field of agriculture, crop growth monitoring, crop yield prediction, crop information monitoring, pest and disease detection and other aspects are more prominent. Objective: By analyzing and discussing the existing Chinese patents on UAV remote sensing tech-nology, we summarize the current applications and future development prospects of UAV remote sensing technology in China's agricultural field. Methods: An overview of current Chinese patents on different directions of UAV remote sensing technology in the agricultural field, and an analysis of the methods used to achieve different application implementation effects. Results: By analyzing the existing Chinese patents on UAV remote sensing technology, we con-clude that the functions they can achieve for different crops can be applied to the data collection of all crops, and analyze their characteristics to summarize future development trends. Conclusion: Through an in-depth study of Chinese UAV remote sensing patents in agriculture, it can be concluded that UAV remote sensing technology can achieve higher applicability and lower cost in agriculture, and for its information collection for one crop, it can be extended to apply to all crops. In the future, UAV remote sensing technology can be more easily and quickly applied to crop information acquisition in the agricultural field. © 2024 Bentham Science Publishers.

关键词： Remote sensing

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Chinese Patent Review of Integrated Management System for Agricultural Machinery

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Recent Patents on Engineering 2024年第8期18卷 17-31页

作者： Bao, Yudong Liu, Yuying Huang, Yongqi School of Mechanical and Power Engineering Harbin University of Science and Technology Heilongjiang Province Harbin150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China

Background: With the rapid development of China's economy and the accelerating process of agricultural mechanization, agricultural machinery has become increasingly popular in agricultural production activities. At the same time, problems in agricultural machinery management have gradually been exposed, hindering the development of modern agriculture. Objective: This study aimed to discuss the development trend of agricultural management and modern agriculture by analyzing and discussing the related patents of agricultural machinery management systems. Methods: The development of agricultural machinery management was summarized, and the representative patents related to agricultural machinery management systems, agricultural machinery automatic control systems, and agricultural machinery terminals were analyzed. Results: By analyzing the existing patents of the agricultural machinery management system, the paper summarized their applications in agricultural management and obtained their future development trend. Conclusion: In agricultural machinery management, we should actively adopt complementary strategies to solve various problems and improve the management level of agricultural machinery. The continuous improvement of the agricultural machinery management system is of great significance to the automation of agricultural production and the modernization of agricultural management in China. © 2024 Bentham Science Publishers.

关键词： Patents and inventions

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Laser Powder Bed Fusion of Beta-Type Titanium Alloys for Biomedical Application:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 17-28页

作者： Xuan Luo Chao Yang Dongdong Li Lai-Chang Zhang State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou510640China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing ofβ-type titanium alloy is expected to replace Ti-6Al-4V alloy in the field of orthopedic implantation because of their low elastic modulus,excellent corrosion resistance,and *** briefly introducing the laser powder bed fusion(LPBF)process and physical phenomena,this paper reviews the recent progresses in LPBF-edβ-type Ti *** strategies to strengthening and tougheningβ-type Ti alloys are critically *** is followed by the processing routes employed to achieve to low modulus for orthopedic applications,especially a new methodology for tailoring crystallographic orientation called multi-track coupled directional *** effect of processing and compositions on performance metrics ofβ-type Ti alloys included corrosion behavior,and biocompatibility is *** the end,challenges in additive manufacturing ofβ-type Ti alloys in future are highlighted,with the aim to ensue clinical application of LPBF-edβ-type Ti alloys.

关键词： β-type Ti alloys Laser powder bed fusion Mechanical properties Elastic modulus Biocompatibility

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A Review on Soft Hand Rehabilitation Robot

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Recent Patents on Engineering 2023年第3期17卷 12-36页

作者： Chen, Zhe Zhan, Fangfang Jiang, Jingang Wu, Dianhao Sun, Jianpeng Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China Heilongjiang Nursing College Harbin150086 China

Abstract: Background: In China, there are more than 2 million patients with hand function impairment caused by trauma and stroke each year. Since the hand is an important sensory and motor organ of the human body, the loss of hand function seriously affects people's daily activities and work. The current hand function rehabilitation robots are mainly rigid. The rigid robot has the problems of fixed rehabilitation track, high rigidity, and poor comfort. To solve this series of problems, soft hand function rehabilitation robots have been vigorously developed. Objective: To introduce the classification, advantages and disadvantages, and development trend of existing soft hand rehabilitation robots. To provide for other researchers to understand its development status and future development trends. Methods: The various products and patents of soft hand rehabilitation robots are summarized, and the structural features, merits, and demerits of typical soft hand rehabilitation robots are introduced. Results: By analyzing a variety of soft hand function rehabilitation robots, the characteristics and the current problems of soft hand function rehabilitation robots are determined, the development trend of soft hand function rehabilitation robots has been prospected, the current research status of soft hand function rehabilitation robots are discussed and the prospects are carried out. Conclusion: Because the rate of increase in patients with hand function loss is much greater than that of rehabilitation physicians, many patients cannot receive timely and effective treatment. There-fore, hand function rehabilitation robots have received people’s attention. Compared with rigid rehabilitation robots, soft hand function rehabilitation robots have diverse rehabilitation trajectories, high comfort, and low rigidity, so it is very necessary to develop soft hand function rehabilitation robots. In the future, soft hand function rehabilitation robots will inevitably develop towards sim

关键词： Patient treatment

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A Review of Soft Crawling Robots with Different Driving Methods

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Recent Patents on Engineering 2024年第1期18卷 85-109页

作者： Tang, Dedong Wang, Gang Tang, Chunyang Yu, Wenzhuo Lv, Xin Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education School of Mechanical Power Engineering Harbin University of Science and Technology Harbin150080 China Department of Automation Tsinghua University Beijing100084 China

Background: Traditional rigid robots are difficult to adapt to complex unstructured environments due to their limited degree of freedom and lack of flexibility. Therefore, soft crawling robots are concerned widely by their powerful deformation ability, infinite number of degrees of freedom, and effective interaction with humans. Objective: This paper aims to report the recent progress of soft crawling robots and provide a reference for readers in this field. Methods: By reading and summarizing the patents and papers related to soft crawling robots in recent years, they are divided into three categories according to different driving methods. The structure, motion mechanism, characteristics, and applications of each class of robots are compared and analyzed. Results: The advantages and disadvantages of each driving method are analyzed, and the key issues in soft crawling robots are pointed out. Based on this, the future development direction of this research field is predicted. Conclusion: The study shows that according to the driving method, soft crawling robots are classified as pressure driven, motor-wire driven, and soft active material driven. In addition, the characteristics of each drive are summarized. In the future, soft crawling robots will have more potential applications in biomedicine, outdoor survey, rescue search, and inspection and maintenance of equipment. © 2024 Bentham Science Publishers.

关键词： Bionics

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Advances in Research of Molded Pulp for Food Packaging

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Journal of Renewable Materials 2023年第11期11卷 3831-3846页

作者： Yifan Liu Shufeng Ma Feijie Wang Liqiang Wang Jiangsu Provincial Key Laboratory of Food Advanced Manufacturing Equipment Technology Wuxi214122China School of Food Science and Technology Jiangnan UniversityWuxi214122China

The molded pulp,a product of three-dimensional papermaking technology,is environmentally friendly and has a low environmental impact due to its ability to decompose quickly in the natural environment after *** application of molded pulp for food packaging can replace or reduce the use of plastic food *** extract fibers from plants for the production of safe and hygienic molded pulp for food packaging,and they also study and enhance the qualities of molded pulp to broaden its use in the food *** paper reviews the sources and varieties of plant fiber used in molded pulp for food packaging,as well as research on the improvement and optimization of the performance of molded pulp ***,issues with molded pulp’s actual use for food packaging are reviewed,along with the potential for future *** work can serve as a reference for molded pulp applications and research in the food industry in the future.

关键词： Molded pulp food packaging plant fiber properties

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