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DRY GRINDING OF Ti6Al4V ALLOY WITH FLAP WHEELS 被引量:9
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作者 霍文国 徐九华 +1 位作者 傅玉灿 苏宏华 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2010年第2期131-137,共7页
The grindability of alloy Ti6AI4V with zireonia alumina and silicon carbide flap wheels, and the effect of process parameters on grinding forces, grinding temperature and surface integrity are studied. The grinding fo... The grindability of alloy Ti6AI4V with zireonia alumina and silicon carbide flap wheels, and the effect of process parameters on grinding forces, grinding temperature and surface integrity are studied. The grinding forces are measured by KISTLER 9265B dynamometer. The grinding temperature response is obtained by NI USB-621X signal collection system. Ground surface morphology and the metallographic structure are observed by the Hirox KN-7700 stereoscopic microcope and the Quanta200 scanning electron microscope (SEM). Surface roughnesses are measured by Mahr Perthometer M1 instrument. The surface microhardnesses are detected by HXS-1000 microhardness tester. 展开更多
关键词 grinding machining Ti6A14V alloys flap wheels
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GRINDING TEMPERATURE AND COOLING RATE DURING GRIND-HARDENING OF 40Cr STEEL 被引量:1
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作者 肖冰 李曙生 +3 位作者 苏宏华 傅玉灿 徐鸿钧 徐九华 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2008年第1期26-31,共6页
The mathematical model of the grinding temperature is established. The grinding temperature and the cooling rate are measured in the grind-hardening process of 40Cr steel under different conditions. Moreover, the grin... The mathematical model of the grinding temperature is established. The grinding temperature and the cooling rate are measured in the grind-hardening process of 40Cr steel under different conditions. Moreover, the grind-hardening effects are investigated. Experimental results show that the calculated temperatures are comparatively close to the measured ones, and the required temperature and cooling rate can be achieved. Furthermore, the microstructure of the hardened zone is similar to that obtained through the high-frequency induction technique. The average hardness of the entirely hardened zone is HV670 and the thickness of the hardened layer is adjacent to 1.3 mm. It indicates that the hardening mechanism induced by the grinding heat and high-frequency heating is identical. Finally, the fine needlelike martensite is obtained. 展开更多
关键词 grinding(machining) HARDENING heating COOLING
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RESEARCH ON MODELING AND CHARACTERISTICS OF THE SPINDLE DYNAMIC COUPLING ABSORBERING SYSTEM OF A SUPER-PRECISION SURFACE GRINDING MACHINE 被引量:2
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作者 YangZhiyong ZhangDawei +1 位作者 HuangTian GaoYongsheng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第2期213-216,共4页
The bearing is described by constrain matrix, and the spindle system of a NCsurface grinding machine is simplified as elastic-coupling beam, then modal synthesis method is usedto establish the dynamic model of beam. M... The bearing is described by constrain matrix, and the spindle system of a NCsurface grinding machine is simplified as elastic-coupling beam, then modal synthesis method is usedto establish the dynamic model of beam. Moreover, the response of the end of rotor is analyzed, andthe natural frequency, principle mode and other dynamic characteristics of the coupling system arestudied, the law of bearing stiffness to coupling frequency and amplitude of rotor is also found.Finally, according to the actual condition, a dynamic absorber is designed. The simulation andexperimental results show that the amplitude of spindle can be declined effectively when the dynamicabsorber is attached. 展开更多
关键词 surface grinding machine coupling system principal mode rotor bearingsystem
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Development of CAD/CAM system and profile measuring device for CNC grinding machine to obtain an optimal grinding speed 被引量:2
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作者 LIM Sang-Heon KIM Jae-Hyun LEE Choon-Man 《Journal of Central South University》 SCIE EI CAS 2011年第1期146-152,共7页
Cam mechanics is one of the most popular devices for generating irregular motions and is widely used in automatic equipment,such as textile machines,internal combustion engines,and other automatic devices.In order to ... Cam mechanics is one of the most popular devices for generating irregular motions and is widely used in automatic equipment,such as textile machines,internal combustion engines,and other automatic devices.In order to obtain a positive motion from the follower using a rotating cam,its shape should be correctly designed and manufactured.The development of an adequate CAD/CAM system for a cam profile CNC grinding machine is necessary to manufacture high-precision cams.The purpose of this study is the development of a CAD/CAM system and profile measuring device for a CNC grinding machine to obtain an optimal grinding speed with a constant surface roughness.Three types of disk cams were manufactured using the proposed algorithm and procedures to verify effectiveness of the developed CAD/CAM system. 展开更多
关键词 CAM CAD/CAM system CNC grinding machine optimal grinding speed
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FEM Simulation of Single-Grit Grinding on a 2.5D Woven Composite 被引量:1
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作者 Yuguo Wang Chao Ding Bin Lin 《Transactions of Tianjin University》 EI CAS 2017年第6期538-546,共9页
Single-grit grinding of a 2.5D woven composite was investigated by the finite-element method (FEM) using a unit-cell model. According to our hypotheses, the axis of the warp yarn was a sinusoidal curve and the cross s... Single-grit grinding of a 2.5D woven composite was investigated by the finite-element method (FEM) using a unit-cell model. According to our hypotheses, the axis of the warp yarn was a sinusoidal curve and the cross section of the weft yarn was shaped like a biconvex lens. AVUMAT subroutine was used to construct the constitutive model of the 2.5D woven composite. The grinding process of the composite was analyzed using an FEM simulation with the ABAQUS/Explicit software. A validation experiment was also carried out. The simulation results showed that a grinding crack was well simulated. Furthermore, the junctions between the warp yarn and weft yarn were found to be seriously damaged and cracks were observed to extend outward along the warp fiber during grinding, in good agreement with the experimental results. In addition, the strain of weft yarns was obviously greater than that of warp yarns when the grinding direction was perpendicular to the weft yarns and parallel to the axis of the warp yarns. These results demonstrate that the mesostructure strongly influences the grinding damage inflicted on woven composites. © 2017 Tianjin University and Springer-Verlag GmbH Germany 展开更多
关键词 ABAQUS Composite materials Computer software Cracks grinding (machining) WEAVING WOOL YARN
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Theoretical Study on Non-transmission High Efficient Parallel Camber Grinding Machine
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作者 LI Yu-peng (Department of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期36-,共1页
Be directed against the development trend of modern CNC grinding machine towards high precision and high efficiency, some general weaknesses of existing camber grinding machine are analyzed in detail. In order to deve... Be directed against the development trend of modern CNC grinding machine towards high precision and high efficiency, some general weaknesses of existing camber grinding machine are analyzed in detail. In order to develop new type CNC camber grinding machine that can grind complex die, and genuinely achieved accurate feed and high efficient grinding, a new type camber grinding machine is put forward, called non-transmission virtual-shaft CNC camber grinding machine. Its feed system is a parallel mechanism that is directly driven by linear step motor. Therefore, traditional transmission types, such as the ball lead-screw mechanisms, the gears, the hydraulic transmission system, etc. are cancelled, and the feed system of new type CNC camber grinding machine can truly possess non-creep, good accuracy retentiveness a wide range of feed-speed change, high kinematical accuracy and positioning precision, etc. In order to realize that the cutting motion is provided with high grinding speed, step-less speed variation, high rotational accuracy, good dynamic performance, and non-transmission, the driving technology of hollow rotor motor is applied to drive the spindle of new type grinding machine,thus leading to the elimination of the transmission parts of cutting motion. The principle structure model of new type camber grinding machine is advanced. The selection, control gist and driving circuit line of the linear step motor are expounded. The main technology characteristics and application advantages of non-transmission virtual-shaft CNC camber grinding machine are introduced. 展开更多
关键词 camber grinding machine non-transmission precision feed high speed grinding
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Fault Diagnosis of Cylindrical Grinding Machine
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作者 杜兵 张宏伟 蒋永翔 《Transactions of Tianjin University》 EI CAS 2010年第1期40-44,共5页
Based on experiment modal analysis(EMA) and operation modal analysis(OMA), the dynamic characteristics of cylindrical grinding machine were measured and provided a basis for further failure analysis.The influences of ... Based on experiment modal analysis(EMA) and operation modal analysis(OMA), the dynamic characteristics of cylindrical grinding machine were measured and provided a basis for further failure analysis.The influences of grinding parameters on dynamic characteristics were studied by analyzing the diagnostic signals extracted from racing and grinding experiments.The significant frequency of 38 Hz related to grinding wheel spindle speed of 2 307 r/min showed that the wheel spindle system was in a state of imbalan... 展开更多
关键词 cylindrical grinding machine fault diagnosis experiment modal analysis operation modal analysis VIBRATION
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Study of CNC Grinding Machining Method About Isometric Polygon Profile
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作者 WANG De-sheng, ZHOU Ai-ping, YUAN Yan-ling (Dept. of Mech. Eng. of JIT, Jiaozuo 454000, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期60-61,共2页
The formed principle and CNC grinding machining method of isometric polygonal profile are studied deeply and systematically. Equation about section curve of isometric polygon profile is set up by means of geometric pr... The formed principle and CNC grinding machining method of isometric polygonal profile are studied deeply and systematically. Equation about section curve of isometric polygon profile is set up by means of geometric principle. With the use of differential geometry theory, the curve is proved to be with geometric feature of convex curve. It is referred to as Isometric Polygonal Curve (IPC), because that is a kind of convex curve on which the distance between any parallel tangent lines is equal. Isometric Polygonal Profile (IPP) or Isometric Polygonal Cone Profile (IPCP) or Isometric Polygonal Topless Cone (IPTC) is formed with the IPC and straight line as generating curve. But the machining and measuring of the IPCP are so inconvenient that it has little value. Keeping in mind the characteristic of the IPP and IPTC, this paper puts forward the program method of CNC grinding machining. Isometric polygonal profile connection is a kind of polygonal profile connection. It has the superiority over keys (prismatic key & spline etc), and can be suit for the situations such as high rotative velocity, large torque, high precision, and small fixed room and vibration. Nowadays, some countries such as America, Russia, German and Switzerland applied CNC machining to the machining of polygon surface coupling parts, which makes their applications in machine productions such as motor engine, heavy machine increase day by day. But reports about concrete machining technology of isometric polygonal profile and programming of CNC machining program are very few. CNC grinding of the IPP and IPTC is one kind of the precision machining technology. It is of great importance to the popularization of the IPP and IPTC connection. From the forming mechanism, we can see that the machining and measuring of the IPP and IPTC are convenient, and therefore they have the value of the popularization. But the machining and measuring of the IPCP are so inconvenient that it has little value. In the programming the CNC grinding of the IPP and IPTC, it is more reasonable to calculate the coordinate of node according to the approaching method of equal error arc. According to the method of CNC grinding mentioned above to design the grinding machine, the structure is simple and of economical and practical. 展开更多
关键词 Isometric Polygonal Profile Isometric Polygonal Topless Cone CNC grinding machining
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Research on CNC Turning System of Aspheric Machining Grinding Wheel
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作者 ZOUQin GUOYin-biao 《Journal of China University of Mining and Technology》 2005年第1期64-67,共4页
The technology of machining aspheric surface with high precision is the premise for the application of aspheric surface. The grinding machining with error compensation is a commonly used method to machine aspheric sur... The technology of machining aspheric surface with high precision is the premise for the application of aspheric surface. The grinding machining with error compensation is a commonly used method to machine aspheric surface, which will directly influence the quality of aspheric workpiece surface. Multifunctional CNC grinding wheel truing system is a four-axis CNC truing system which can be applied to grinding wheel truing. In this system, DSP-based multi-axes motion control card is adopted as the controller, and visual C++ is used as development tool. When the design of hardware and software is completed, the system can implement truing of various grinding wheel with high precision aspheric machining such as plane grinding wheel, arc grinding one, and sphere grinding one. 展开更多
关键词 aspheric machining grinding wheel CNC system truing
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YK 7425 GEAR GRINDING MACHINE
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《China's Foreign Trade》 1996年第11期61-61,共1页
This is a newly developed product,CNC gear grinding machine basedon original Y 7125 A large planargear grinding machine, produced by theQinchuan Machine Tool Works. It is chieflyused for grinding the involute tooth pr... This is a newly developed product,CNC gear grinding machine basedon original Y 7125 A large planargear grinding machine, produced by theQinchuan Machine Tool Works. It is chieflyused for grinding the involute tooth profilesof gear-shaping cutters, gear-shaving cuttersand master gears, and is also used for grindinghigh precision spur and helical gears. It issuitable for the departments of the automobiles,tractors, aircraft, machine tools and toolmanufacturing industries. 展开更多
关键词 CNC GEAR YK 7425 GEAR grinding MACHINE
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MODELM1432C——UNIVERSAL CYLINDRICAL GRINDING MACHINE
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《China's Foreign Trade》 1996年第1期32-32,共1页
The new machine features high precision,excellent rigidity and practical structure.It is made by the Beijing No.2 MachineTool Works with 40 years of experience inproducing high-precision cylindrical grindingmachines.I... The new machine features high precision,excellent rigidity and practical structure.It is made by the Beijing No.2 MachineTool Works with 40 years of experience inproducing high-precision cylindrical grindingmachines.It is already close to the standardof high precision machine tools in terms ofmachining accuracy,therefore its variousfeatures are distinctly better than previousmodels.Since being put on the market,it hasbeen well received by users. The machine is used in machineprocessing shops,tool shops and repair shopsto grind internal and external cylindricalsurfaces of cylinders and tapers. 展开更多
关键词 HIGH MODELM1432C UNIVERSAL CYLINDRICAL grinding MACHINE
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YM7132A——GEAR GRINDING MACHINE WITH CONICAL GRINDING WHEEL
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《China's Foreign Trade》 1996年第1期33-33,共1页
The YM7132A gear grindingmachine with a conical grindingwheel is used for grindingcylindrical spur and helical involutegears,especially for hardenedprecision gears of small andmedium sizes.
关键词 GEAR grinding MACHINE WITH CONICAL grinding WHEEL YM7132A
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YK7232——GEAR GRINDING MACHINE WITH WORM GRINDING WHEEL
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《China's Foreign Trade》 1996年第1期33-33,共1页
The machine is used for precisiongrinding of hardened cylindricalgears with medium module inbatches for the industries ofaircraft,automobile,machine tool,gear box and various transmissiondevices.
关键词 GEAR grinding MACHINE WITH WORM grinding WHEEL YK7232
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YK7250 Gear Grinding Machine With Worm-Grinding Wheel
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《China's Foreign Trade》 1997年第10期28-28,共1页
The YK7250 gear grinding machine with worm grinding wheel is manufactured by the Qinchuan Machine Tool Group Co., Ltd. in Baoji City, Shaanxi Province.
关键词 YK7250 Gear grinding Machine With Worm-grinding Wheel
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Research of Plane Grinding under Combined Movement of X-Y Axis
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作者 LIU Qing ZHANG Guang-peng +1 位作者 HUANG Yu-mei CHEN Lei 《International Journal of Plant Engineering and Management》 2017年第1期47-58,共12页
There are many parameters which can influence plane grinding. It is a situation in high workload and poor realizability to find the optimization parameters of the grinding by using experimental method. Taking X-Y link... There are many parameters which can influence plane grinding. It is a situation in high workload and poor realizability to find the optimization parameters of the grinding by using experimental method. Taking X-Y linkage plane grinding as the platform, influence of grinding quality with 4 factors including initial diameter of the abrasive, initial phase angle, lapping plate & workpiece speed ratio and X-Y linkage workbench through simulation is studied. The results show that initial radius vector of the abrasive basically has not effect on grinding trace. When speed ratio between lapping plate with workpiece is decimal the grinding trace seems much better. The significant influence of grinding quality can made by straight and helical X-Y linkage motion on workbench 展开更多
关键词 multi-parameter plane grinding machine grinding curve simulation
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FORMING AND PRECISION MACHINING TO NANOMATERIALS LUMP
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作者 ZhanJie ZhangJin ChenBingkui ChenXiaoan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第4期534-536,共3页
The technology of forming and machining lump nano-materials has beeninvestigated. Grinding, abrasive machining test has been conducted to Fe, Co, Ni and Al lumpnano-materials. Experiments have been done to measure gri... The technology of forming and machining lump nano-materials has beeninvestigated. Grinding, abrasive machining test has been conducted to Fe, Co, Ni and Al lumpnano-materials. Experiments have been done to measure grinding force, grinding thermal, machiningroughness and micro-hardness. Image analysis is carried out by metallographic and scanning tunnelmicroscopic microscope. Researches provide the basis data for forming and machining lumpnano-materials. 展开更多
关键词 NANO-MATERIALS grinding machining Abrasive machining
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RESEARCH OF NEWTECHNOLOGIES IN GEAR-MACHINING 被引量:2
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作者 Liang Xichang Shao Ming Chen DaThe State Key Laboratory of Mechanical Transmission,(Chongqing University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1994年第3期188-192,共17页
This paper describes the basic principles and the researched technology levels of involute gear forming-grinding technology in a economic way,and special shaping technology,cycloidal gear machining technology and enve... This paper describes the basic principles and the researched technology levels of involute gear forming-grinding technology in a economic way,and special shaping technology,cycloidal gear machining technology and enveloping electrospark machining technology of internal gear harden surfaces. 展开更多
关键词 Gear grinding Slotting Electrospark machining
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Development of an oscillating grinding machine tool based on error analysis 被引量:1
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作者 WANG LiPing WANG Dong +1 位作者 WANG Bo LI WeiHua 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2020年第6期912-922,共11页
Oscillating grinding machine tool is the core equipment when machining crankshaft pin journal,which directly determines the final quality.This paper describes the development of an oscillating grinding machine tool ba... Oscillating grinding machine tool is the core equipment when machining crankshaft pin journal,which directly determines the final quality.This paper describes the development of an oscillating grinding machine tool based on error analysis.First,the error analysis of oscillating grinding for crankshaft pin journal is carried out,including the effect on machining accuracy caused by each error and corresponding error sensitivity.The results show that the tracking error of X-axis has the greatest influence on the grinding accuracy of pin journal,thus,the grinding carriage feed system is the critical component of an oscillating grinding machine tool,which should be given priority during the development process.Next,the development of an oscillating grinding machine tool is described.The whole structure is given,and the grinding carriage feed system is emphatically presented involving drive mode and assembly method.Other components of the oscillating grinding machine tool are also introduced.Finally,some grinding experiments are performed on the prototype,and the results show that all workpieces are qualified under different conditions,which verify the performance of the developed oscillating grinding machine tool. 展开更多
关键词 oscillating grinding machine tool error analysis crankshaft pin journal grinding carriage feed system
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Detection of subsurface defects of fused silica optics by confocal scattering microscopy 被引量:8
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作者 马彬 沈正祥 +5 位作者 贺鹏飞 季一勤 桑田 刘华松 刘丹丹 王占山 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第3期296-299,共4页
A non-destructive technique for subsurface measurements is proposed by combining light scattering method with laser confocal scanning tomography. The depth and distribution of subsurface defect layers are represented ... A non-destructive technique for subsurface measurements is proposed by combining light scattering method with laser confocal scanning tomography. The depth and distribution of subsurface defect layers are represented in term of scattered light intensity pattern, and three types of fused silica specimens are fabricated by different grinding and polishing processes to verify the validity and effectiveness. By using the direct measurement method with such technique, micron-scale cracks and scratches can be easily distinguished, and the instructional subsurface defect depths of 55, 15, and 4 μm are given in real time allowing for an in-process observation and detection. 展开更多
关键词 Crack detection Defects grinding (machining) Light Light scattering SCATTERING Silica TOMOGRAPHY
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Experimental investigation on laser-induced surface damage threshold of Nd-doped phosphate glass 被引量:1
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作者 胡俊江 张磊 +2 位作者 陈伟 周常河 胡丽丽 《Chinese Optics Letters》 SCIE EI CAS CSCD 2012年第4期29-32,共4页
Nd-doped phosphate glass is the dominant amplifier material used in solid state high average power laser systems.Surface imperfection and subsurface damage(SSD)of the glass,resulting from the optical fabrica-tion pr... Nd-doped phosphate glass is the dominant amplifier material used in solid state high average power laser systems.Surface imperfection and subsurface damage(SSD)of the glass,resulting from the optical fabrica-tion process,limit the increment of laser system energy output.Thus,it is important to enhance the surface damage threshold of Nd-doped phosphate glass surface.The influence of abrasive size,polishing powder,grinding mode,and chemical treatment on the laser-induced damage threshold(LIDT)of Nd-doped phos-phate glass surface is investigated.Results show that the LIDT is affected little by different polishing powders and grinding modes.The LIDT correlates with the abrasive size,which produced different depths of SSD.A suitable acid etching treatment can remove the imperfection and the SSD for improving the LIDT of Nd-doped phosphate glass surface.The combination of several effective techniques and methods,which are low-cost and practical,should be useful to enhance the LIDT of Nd-doped phosphate glass surface. 展开更多
关键词 ABRASIVES grinding (machining) Laser damage NEODYMIUM Optics POLISHING
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