期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
Vibration suppression in multi-tool ultrasonic machining to multi-external and parametric excitations 被引量:3
1
作者 M.M.Kamel W.A.A.El-Ganaini Y.S.Hamed 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第3期403-415,共13页
Ultrasonic machining (USM) is of particular interest for the machining of non-conductive, brittle materials such as engineering ceramics. In this paper, a multi-tool technique is used in USM to reduce the vibration ... Ultrasonic machining (USM) is of particular interest for the machining of non-conductive, brittle materials such as engineering ceramics. In this paper, a multi-tool technique is used in USM to reduce the vibration in the tool holder and have reasonable amplitude for the tools. This can be done via dynamic absorbers. The coupling of four nonlinear oscillators of the tool holder and tools representing ultrasonic cutting process are investigated. This leads to a four-degree-of-freedom system subjected to multi-external and multi-parametric excitation forces. The aim of this work is to control the tool holder behavior at simultaneous primary, sub-harmonic and internal resonance condition. Multiple scale perturbation method is used to obtain the solution up to the second order approximations. The different resonance cases are reported and studied numerically. The stability of the system is investigated by using both phase-plane and frequency response techniques. The effects of the different parameters of the tools on the system behavior are studied numerically. Comparison with the available published work is reported. 展开更多
关键词 CONTROL STABILITY ultrasonic machining (USM)
下载PDF
Analysis of the Rotary Ultrasonic Machining Mechanism 被引量:1
2
作者 YA Gang, QIN Hua-wei, YANG Shi-chun, XU Yong-wa (Department of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期59-60,共2页
Ultrasonic machining (USM) is considered as an effective method for machining hard and brittle materials such as glass, engineering ceramics, semiconductors, diamonds, metal composites and so on. However, the low mate... Ultrasonic machining (USM) is considered as an effective method for machining hard and brittle materials such as glass, engineering ceramics, semiconductors, diamonds, metal composites and so on. However, the low material removal rate due to using abrasive slurry limits further application of USM. Rotary ultrasonic machining (rotary USM) superimposes rotational movement on the tool head that vibrates at ultrasonic frequency (20 kHz) simultaneously. The tool is made of mild steel coated or bonded with diamond abrasive. Therefore, abrasive slurry is abandoned and coolant is used to carry debris out of working area. Compared with USM, rotary USM can obtain much higher material removal rate, deep holes, and fine precision, which leads to its further application. Combined with CNC technology, rotary USM can be used to conduct contour machining of hard and brittle materials. In this paper, the movement of abrasive particles in tool tip of rotary ultrasonic machining is analyzed. The impacting and grinding of abrasive in tool tip to machined surface are considered as main factors to material removal rate. The process of crack forming and growing in one loading and unloading cycle can be described as following stages: a) When abrasive particle acts the pressure on work-piece, the macro cracks in periphery of contact area are exerted increasing tensile stress. b) As the tensile stress increase to the critical of material tension, the one of cracks in periphery of contact area begins to propagate around contact area and develop beneath the surface to certain depth. c) Indentation area varies with increasing of load, the circle crack around contact area steadily or dynamical propagates towards inside of work-piece. d) As tensile stress in crack increases to critical of crack steady failure, circle crack suddenly becomes conic crack. e) Further increase load, the crack continues to grow while contact area is surrounded by conic cracks. f) During unloading, conic crack begins to close, some of cracks continue their extension towards the surface and forms a circle groove. The mathematical model for material removal rate shows that the factors affecting on material removal rate are static load, grid and concentration of abrasive, mechanical properties of machined materials, rotational speed of tool and feed speed of work-piece. 展开更多
关键词 ultrasonic machining CERAMICS material removal rate
下载PDF
Experimental study on rotary longitudinal-torsional ultrasonic machining of unidirectional CFRP
3
作者 Ziqiang ZHANG Feng JIAO +3 位作者 Yuanxiao LI Xue WANG Ying NIU Jinglin TONG 《Chinese Journal of Aeronautics》 SCIE EI CAS 2024年第11期517-534,共18页
Addressing the challenges of high grinding temperature,poor hole quality,and tool rod blocking in core drilling of carbon fiber reinforced plastics(CFRP),this study investigates the material removal characteristic of ... Addressing the challenges of high grinding temperature,poor hole quality,and tool rod blocking in core drilling of carbon fiber reinforced plastics(CFRP),this study investigates the material removal characteristic of rotary longitudinal-torsional ultrasonic machining(RLTUM)of CFRP based on the Hertz contact theory.The study also conducts relevant experiments to compare and analyze the grinding force,grinding temperature,hole wall quality,exit quality,and tool wear in ordinary core drilling(OCD),rotary ultrasonic machining(RUM),and RLTUM of CFRP.The results demonstrate that RLTUM significantly reduces the grinding force,grinding temperature,hole exit damage and improves the surface smoothness of the CFRP hole walls.By utilizing intermittent cutting in circumferential direction for torsional vibration,RLTUM enables automatic removal of rod chips while restraining tool chip adhesion and reducing heat generation as well as tool wear.Therefore,RLTUM shows great potential for enhancing the quality of holemaking in CFRP. 展开更多
关键词 Carbon fiber reinforced plastics(CFRP) Rotary longitudinal-torsional ultrasonic machining Grinding force Grinding temperature Hole quality Tool wear
原文传递
Research on Cutting Force of Ultrasonic Diamond Wire Saw 被引量:5
4
作者 张辽远 李鑫 《Defence Technology(防务技术)》 SCIE EI CAS 2010年第2期114-118,共5页
Based on impulse and vibration machining theories,a mathematical model of cutting force for the electroplated diamond ultrasonic wire saw was established using superposition principle.The differences between the cutti... Based on impulse and vibration machining theories,a mathematical model of cutting force for the electroplated diamond ultrasonic wire saw was established using superposition principle.The differences between the cutting forces with and without ultrasonic effect were analyzed theoretically and experimentally.The results indicate that the cutting force of diamond wire increases along with the spindle speed decrease and the lateral pressure increase.The force in ultrasonic vibration cutting is about 20% to 30% less than that in conventional cutting.Also,the cutting trajectory of single diamond grit in sawing process is simulated,and the reason that the ultrasonic vibration can reduce the cutting force is explained further. 展开更多
关键词 machinofature technique and equipment mechanics manufacturing process hard and brittle material electroplated diamond wire saw ultrasonic machining
下载PDF
TP-Series Ultrasonic Cleaning Machines
5
作者 Shi Yi 《China's Foreign Trade》 1994年第9期54-54,共1页
In the patents pavilion of the Fifth Asia-Pacific Fair, the attention of numerous visitors was riveted by an onthe-spot demonstration. Standing before them was a machine with a stainless steel casing partly in a conta... In the patents pavilion of the Fifth Asia-Pacific Fair, the attention of numerous visitors was riveted by an onthe-spot demonstration. Standing before them was a machine with a stainless steel casing partly in a container of clear water. The operator pressed a button and ripples appeared on the surface of the water. The operator took watch chain s and jewellery from the visitors and put them in 展开更多
关键词 TP-Series ultrasonic Cleaning Machines
下载PDF
Experimental study and optimization of cutting parameters in machining of super alloy with hybrid ultrasonic method 被引量:1
6
作者 Dipesh Popli Meenu Gupta 《Advances in Manufacturing》 SCIE CAS CSCD 2017年第3期199-216,共18页
Super alloys are intensively used in various industries, especially in the aerospace industry, because of their special characteristics. A number of holes are sometimes required to be drilled into super alloys for air... Super alloys are intensively used in various industries, especially in the aerospace industry, because of their special characteristics. A number of holes are sometimes required to be drilled into super alloys for aircraft at their final stage assembly. In the present study, a hybrid ultrasonic machining method, called rotary ultrasonic machining (RUM), was successfully used in super alloy drilling. The empirical modeling of the process parameters of RUM was performed for the super alloy (Inconel 718) using an experimental design approach, called response surface methodology (RSM). Parameters, namely tool rotation, feed rate, ultrasonic power, and abrasive grit size, were selected as input variables. The others were kept constant. The performance was measured in terms of the machining rate and the surface roughness. The developed models were found to be reliable representatives of the experimental results with prediction errors less than 4-5%. Moreover, the feed rate for the quality and productivity aspect was found to be the most critical factor. The optimized values of the machining rate and the surface roughness achieved through a multi-response optimization were 0.9 825 mm3/s and 0.951 i.tm, respectively. 展开更多
关键词 Super alloy Rotary ultrasonic machining(RUM) ultrasonic ·Roughness machining
原文传递
Chatter stability of robotic rotary ultrasonic countersinking
7
作者 Zhenwen SUN Wenhe LIAO +3 位作者 Kan ZHENG Song DONG Pei LEI Lianjun SUN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第10期434-444,共11页
In recent years,industrial robots have received extensive attention in manufacturing field due to their high flexibility and great workspace.However,the weak stiffness of industrial robots makes it extremely easy to a... In recent years,industrial robots have received extensive attention in manufacturing field due to their high flexibility and great workspace.However,the weak stiffness of industrial robots makes it extremely easy to arouse chatter,which affects machining quality inevitably and generates noise pollution in severe cases.Compared with drilling,the chatter mechanism of robotic countersinking is more complex.The external excitation changes with cutting width and depth in countersinking.This characteristic results in time-varying and nonlinearity of robotic countersinking dynamics.Thus,it is urgent to propose a new method of chatter suppression and provide an accurate stability analysis model.As a new special machining technology,rotary ultrasonic machining has been proved to improve robotic drilling and milling stability effectively.Based on this,robotic rotary ultrasonic countersinking(RRUC)is proposed to improve the robotic countersinking stability in this paper.A three-dimensional stability domain method of RRUC is established.First,the countersinking process was divided intoρparts.The dynamic model of every unit was constructed based on ultrasonic function angle(γ)and dynamic chip area.Then,the stability region of RRUC is obtained based on the semi-discrete method(SDM).Compared with the robotic conventional countersinking(RCC),RRUC improves the stability by 27%.Finally,the correctness and effectiveness of the stability region model are proved by robotic ultrasonic countersinking experiments. 展开更多
关键词 Industrial robot Rotary ultrasonic machining Dynamic model Countersinking chatter Stability analysis
原文传递
Ultrasonic vibration-assisted machining:principle,design and application 被引量:21
8
作者 Wei-Xing Xu Liang-Chi Zhang 《Advances in Manufacturing》 SCIE CAS CSCD 2015年第3期173-192,共20页
Ultrasonic vibration-assisted (UVA) machining is a process which makes use of a micro-scale high frequency vibration applied to a cutting tool to improve the material removal effectiveness. Its principle is to make ... Ultrasonic vibration-assisted (UVA) machining is a process which makes use of a micro-scale high frequency vibration applied to a cutting tool to improve the material removal effectiveness. Its principle is to make the tool-workpiece interaction a microscopically non-monotonic process to facilitate chip separation and to reduce machining forces. It can also reduce the deformation zone in a workpiece under machining, thereby improving the surface integrity of a component machined. There are several types of UVA machining processes, differentiated by the directions of the vibrations introduced relative to the cutting direction. Applications of UVA machining to a wide range of workpiece materials have shown that the process can considerably improve machining performance. This paper aims to provide a comprehensive discussion and review about some key aspects of UVA machining such as cutting kinematics and dynamics, effect of workpiece materials and wear of cutting tools, involving a wide range of workpiece materials including metal alloys, ceramics, amorphous and composite materials. Some aspects for further investigation are also outlined at the end. 展开更多
关键词 ultrasonic vibration-assisted (UVA) machining. Cutting Metal alloys CERAMICS Composites
原文传递
Modeling the optimal compensation capacitance of a giant magnetostrictive ultrasonic transducer with a loosely-coupled contactless power transfer system
9
作者 Tian LAN Ping-fa FENG +2 位作者 Jian-jian WANG Jian-fu ZHANG Hui-lin ZHOU 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2022年第10期757-770,共14页
The giant magnetostrictive rotary ultrasonic processing system(GMUPS)with a loosely-coupled contactless power transfer(LCCPT)has emerged as a high-performance technique for the processing of hard and brittle materials... The giant magnetostrictive rotary ultrasonic processing system(GMUPS)with a loosely-coupled contactless power transfer(LCCPT)has emerged as a high-performance technique for the processing of hard and brittle materials,owing to its high power density.A capacitive compensation is required to achieve the highest energy efficiency of GMUPS to provide sufficient vibration amplitude when it works in the resonance state.In this study,an accurate model of the optimal compensation capacitance is derived from a new electromechanical equivalent circuit model of the GMUPS with LCCPT,which consists of an equivalent mechanical circuit and an electrical circuit.The phase lag angle between the mechanical and electrical circuits is established,taking into account the non-negligible loss in energy conversion of giant magnetostrictive material at ultrasonic frequency.The change of system impedance characteristics and the effectiveness of the system compensation method under load are analyzed.Both idle vibration experiments and machining tests are conducted to verify the developed model.The results show that the GMUPS with optimal compensation capacitance can achieve the maximum idle vibration amplitude and smallest cutting force.In addition,the effects of magnetic conductive material and driving voltages on the phase lag angle are also evaluated. 展开更多
关键词 Rotary ultrasonic machining Giant magnetostrictive transducer(GMT) Loosely-coupled contactless power transfer(LCCPT) Electromechanical equivalent circuit Optimal compensation capacitance
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部