The Experts below are selected from a list of 2952 Experts worldwide ranked by ideXlab platform
Margaret Lucas - One of the best experts on this subject based on the ideXlab platform.
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Optimisation of a Cymbal Transducer for Its Use in a High-power Ultrasonic Cutting Device for Bone Surgery
Physics Procedia, 2016Co-Authors: Fernando Bejarano, Andrew Feeney, Margaret LucasAbstract:The class V cymbal is a flextensional transducer commonly used in low-power Ultrasonic applications. The resonance frequency of the transducer can be tailored by the choice of end-cap and driver materials, and the dimensions of the end-caps. The cymbal transducer has one significant limitation which restricts the operational vibration amplitude of the device. This is the limit imposed by the mechanical strength of the bonding agent between the metal end-cap and the piezoceramic driver. Therefore, when there is an increase in the input power or displacement, the stresses in the bonding layer can lead to debonding, thereby rendering the cymbal transducer ineffective for high-power Ultrasonic applications. In this paper, several experimental analyses have been performed, complemented by the use of Abaqus/CAE finite element analysis, in order to develop a high-power Ultrasonic Cutting device for bone surgery using a new configuration of cymbal transducer, which is optimised for operation at high displacement and high input power. This new transducer uses a combination of a piezoceramic disc with a metal ring as the driver, thereby improving the mechanical coupling with the metal end-cap.
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Ultrasonic Cutting Device for Bone Surgery Based on a Cymbal Transducer
Physics Procedia, 2015Co-Authors: Fernando Bejarano, A. M. Spadaccino, R Wallace, Margaret Lucas, H SimpsonAbstract:In this study, we introduce a new prototype Ultrasonic Cutting device for bone surgery based on a class V flextensional cymbal transducer, configured for use in power Ultrasonics applications, which removes many of the geometrical restrictions on the Cutting tip of Langevin-based transducers. The benefit of incorporating a cymbal transducer is that since the Cutting blade itself does not have to be tuned, blade design can focus more closely on delivering the best interaction with bone to provide a highly accurate cut. Small variations to the geometry of the blade do not affect the final resonance frequency. Also the Ultrasonic device can be miniaturised to allow the design of devices for delicate orthopaedic procedures involving minimal-access surgery. The results show how the cymbal transducer, driven by a single piezoceramic disc, can excite sufficiently high vibration displacement amplitudes at lower driving voltages. This is achieved by adapting the configuration of the cymbal to remove the problem of epoxy layer debonding, and by optimising the cymbal end-cap and geometry through finite element modelling supported with experimental vibration characterisation. Preliminary characterisations of the resulting prototype Ultrasonic bone Cutting device, which operates at around 25 kHz, illustrate the success of this novel device design.
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Ultrasonic Cutting for surgical applications
Power Ultrasonics: Applications of High-Intensity Ultrasound, 2014Co-Authors: Margaret Lucas, Andrew MathiesonAbstract:This chapter investigates the application of Ultrasonic Cutting in surgical procedures, reviewing its origins to the current art. The mechanisms of Ultrasonic Cutting of both soft and mineralized tissues are discussed with reference to device design, experimental characterization, and clinical use. Finally, integrating new materials in devices, including transduction materials and shape memory alloys, as well as novel transducer designs, illustrate the future trends of Ultrasonics in surgical Cutting devices.
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A finite element model for Ultrasonic Cutting.
Ultrasonics, 2006Co-Authors: Margaret Lucas, Euan Mcculloch, Alan Macbeath, Andrea CardoniAbstract:Using a single-blade Ultrasonic Cutting device, a study of Ultrasonic Cutting of three very different materials is conducted using specimens of cheese, polyurethane foam and epoxy resin. Initial finite element models are created, based on the assumption that the Ultrasonic blade causes a crack to propagate in a controlled mode 1 opening, and these are validated against experimental data from three point bend fracture tests and Ultrasonic Cutting experiments on the materials. Subsequently, the finite element model is developed to represent Ultrasonic Cutting of a multi-layered material. Materials are chosen whose properties allow a model to be developed that could represent a multi-layer food product or biological structure, to enable Ultrasonic Cutting systems to be designed for applications both in the field of food processing and surgical procedures. The model incorporates an estimation of the friction condition between the Cutting blade and the material to be cut and allows adjustment of the frequency, Cutting amplitude and Cutting speed.
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Methods for reducing Cutting temperature in Ultrasonic Cutting of bone.
Ultrasonics, 2006Co-Authors: Andrea Cardoni, Alan Macbeath, Margaret LucasAbstract:Abstract Ultrasonic Cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cooling. For example, if Cutting temperatures above 55–60 °C are reached, particularly for sustained periods, bone necrosis can occur, compromising post-operative recovery. A recent study by the authors has shown that the thermal response in natural materials, such as wood and bone, is affected by the absorption of Ultrasonic energy and conduction of heat from the cut site. In this paper the dependency of Cutting parameters, such as blade tip vibration velocity, applied load, tuned frequency and coupling contact conditions, on the thermal response are reported and results show that it is possible to maintain Cutting temperatures within safety limits by controlling the Cutting parameters. A novel Cutting blade design is proposed that reduces frictional heat generated at the cut site. Through a series of experimental investigations using fresh bovine femur it is demonstrated that the Cutting temperature, and hence thermal damage, can be reduced by selecting appropriate Cutting parameters and blade profile.
Andrea Cardoni - One of the best experts on this subject based on the ideXlab platform.
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Methods for reducing Cutting temperature in Ultrasonic Cutting of bone.
Ultrasonics, 2006Co-Authors: Andrea Cardoni, Alan Macbeath, Margaret LucasAbstract:Abstract Ultrasonic Cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cooling. For example, if Cutting temperatures above 55–60 °C are reached, particularly for sustained periods, bone necrosis can occur, compromising post-operative recovery. A recent study by the authors has shown that the thermal response in natural materials, such as wood and bone, is affected by the absorption of Ultrasonic energy and conduction of heat from the cut site. In this paper the dependency of Cutting parameters, such as blade tip vibration velocity, applied load, tuned frequency and coupling contact conditions, on the thermal response are reported and results show that it is possible to maintain Cutting temperatures within safety limits by controlling the Cutting parameters. A novel Cutting blade design is proposed that reduces frictional heat generated at the cut site. Through a series of experimental investigations using fresh bovine femur it is demonstrated that the Cutting temperature, and hence thermal damage, can be reduced by selecting appropriate Cutting parameters and blade profile.
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A finite element model for Ultrasonic Cutting.
Ultrasonics, 2006Co-Authors: Margaret Lucas, Euan Mcculloch, Alan Macbeath, Andrea CardoniAbstract:Using a single-blade Ultrasonic Cutting device, a study of Ultrasonic Cutting of three very different materials is conducted using specimens of cheese, polyurethane foam and epoxy resin. Initial finite element models are created, based on the assumption that the Ultrasonic blade causes a crack to propagate in a controlled mode 1 opening, and these are validated against experimental data from three point bend fracture tests and Ultrasonic Cutting experiments on the materials. Subsequently, the finite element model is developed to represent Ultrasonic Cutting of a multi-layered material. Materials are chosen whose properties allow a model to be developed that could represent a multi-layer food product or biological structure, to enable Ultrasonic Cutting systems to be designed for applications both in the field of food processing and surgical procedures. The model incorporates an estimation of the friction condition between the Cutting blade and the material to be cut and allows adjustment of the frequency, Cutting amplitude and Cutting speed.
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Methods for reducing Cutting temperature in Ultrasonic Cutting of bone.
Ultrasonics, 2006Co-Authors: Andrea Cardoni, Alan Macbeath, Margaret LucasAbstract:Ultrasonic Cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cooling. For example, if Cutting temperatures above 55-60 degrees C are reached, particularly for sustained periods, bone necrosis can occur, compromising post-operative recovery. A recent study by the authors has shown that the thermal response in natural materials, such as wood and bone, is affected by the absorption of Ultrasonic energy and conduction of heat from the cut site. In this paper the dependency of Cutting parameters, such as blade tip vibration velocity, applied load, tuned frequency and coupling contact conditions, on the thermal response are reported and results show that it is possible to maintain Cutting temperatures within safety limits by controlling the Cutting parameters. A novel Cutting blade design is proposed that reduces frictional heat generated at the cut site. Through a series of experimental investigations using fresh bovine femur it is demonstrated that the Cutting temperature, and hence thermal damage, can be reduced by selecting appropriate Cutting parameters and blade profile.
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P2G-7 Effect of Ultrasonic Cutting Blade Orientation on Cutting Temperature
2006 IEEE Ultrasonics Symposium, 2006Co-Authors: Alan Macbeath, M. Lucas, Andrea CardoniAbstract:Ultrasonic Cutting of bone offers advantages compared with orthopaedic devices that rely on a reciprocating action, including the elimination of swarf, improved cut quality and precision, and reduced reaction forces. The technology has become accepted as an alternative Cutting procedure for use in surgical operations on soft tissue. Recent studies conducted on bovine bone and a bone substitute material have shown that Ultrasonic Cutting results in a precise and fast operation using relatively low forces. Previous work by the authors highlighted the significance of frictional heating during Ultrasonic Cutting, a phenomenon that can lead to material degradation and excessive burning of the cut surface. The work presented a method of reducing Cutting temperature by controlling Ultrasonic Cutting parameters and also presented a method of further reducing Cutting temperature by incorporating blade geometry modifications that reduce friction between the blade and the specimen. Such studies have been concerned with uni-axial Cutting blade orientations, known as guillotine Cutting, and opportunities exist to enhance orthopaedic Ultrasonic Cutting by developing blades that can operate in more than one Cutting direction. This paper investigates the relationship between Cutting parameters (such as Cutting speed, applied load and blade tip vibration velocity) and temperature at locations around the cut site for a synthetic bone material during guillotine and slicing mode Cutting
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Optimisation of the vibrational response of Ultrasonic Cutting systems
Ima Journal of Applied Mathematics, 2005Co-Authors: Matthew Cartmell, Andrea Cardoni, Fannon Lim, Margaret LucasAbstract:This paper provides an account of an investigation into possible dynamic interactions between two coupled non-linear sub-systems, each possessing opposing non-linear overhang characteristics in the frequency domain in terms of positive and negative cubic stiffnesses. This system is a two-degree-of-freedom Duffing oscillator in which certain non-linear effects can be advantageously neutralised under specific conditions. This theoretical vehicle has been used as a preliminary methodology for understanding the interactive behaviour within typical industrial Ultrasonic Cutting components. Ultrasonic energy is generated within a piezoelectric exciter, which is inherently non-linear, and which is coupled to a bar- or block-horn, and to one or more material Cutting blades, for example. The horn/blade configurations are also non-linear, and within the whole system there are response features which are strongly reminiscent of positive and negative cubic stiffness effects. The two-degree-of-freedom model is analysed and it is shown that a practically useful mitigating effect on the overall non-linear response of the system can be created under certain conditions when one of the cubic stiffnesses is varied. It has also been shown experimentally that coupling of Ultrasonic components with different non-linear characteristics can strongly influence the performance of the system and that the general behaviour of the hypothetical theoretical model is indeed borne out in practice. Further experiments have shown that a multiple horn/blade configuration can, under certain circumstances, display autoparametric responses based on the forced response of the desired longitudinal mode parametrically exciting an undesired lateral mode. Typical autoparametric response phenomena have been observed and are presented at the end of the paper.
Alan Macbeath - One of the best experts on this subject based on the ideXlab platform.
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Methods for reducing Cutting temperature in Ultrasonic Cutting of bone.
Ultrasonics, 2006Co-Authors: Andrea Cardoni, Alan Macbeath, Margaret LucasAbstract:Abstract Ultrasonic Cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cooling. For example, if Cutting temperatures above 55–60 °C are reached, particularly for sustained periods, bone necrosis can occur, compromising post-operative recovery. A recent study by the authors has shown that the thermal response in natural materials, such as wood and bone, is affected by the absorption of Ultrasonic energy and conduction of heat from the cut site. In this paper the dependency of Cutting parameters, such as blade tip vibration velocity, applied load, tuned frequency and coupling contact conditions, on the thermal response are reported and results show that it is possible to maintain Cutting temperatures within safety limits by controlling the Cutting parameters. A novel Cutting blade design is proposed that reduces frictional heat generated at the cut site. Through a series of experimental investigations using fresh bovine femur it is demonstrated that the Cutting temperature, and hence thermal damage, can be reduced by selecting appropriate Cutting parameters and blade profile.
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A finite element model for Ultrasonic Cutting.
Ultrasonics, 2006Co-Authors: Margaret Lucas, Euan Mcculloch, Alan Macbeath, Andrea CardoniAbstract:Using a single-blade Ultrasonic Cutting device, a study of Ultrasonic Cutting of three very different materials is conducted using specimens of cheese, polyurethane foam and epoxy resin. Initial finite element models are created, based on the assumption that the Ultrasonic blade causes a crack to propagate in a controlled mode 1 opening, and these are validated against experimental data from three point bend fracture tests and Ultrasonic Cutting experiments on the materials. Subsequently, the finite element model is developed to represent Ultrasonic Cutting of a multi-layered material. Materials are chosen whose properties allow a model to be developed that could represent a multi-layer food product or biological structure, to enable Ultrasonic Cutting systems to be designed for applications both in the field of food processing and surgical procedures. The model incorporates an estimation of the friction condition between the Cutting blade and the material to be cut and allows adjustment of the frequency, Cutting amplitude and Cutting speed.
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Methods for reducing Cutting temperature in Ultrasonic Cutting of bone.
Ultrasonics, 2006Co-Authors: Andrea Cardoni, Alan Macbeath, Margaret LucasAbstract:Ultrasonic Cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cooling. For example, if Cutting temperatures above 55-60 degrees C are reached, particularly for sustained periods, bone necrosis can occur, compromising post-operative recovery. A recent study by the authors has shown that the thermal response in natural materials, such as wood and bone, is affected by the absorption of Ultrasonic energy and conduction of heat from the cut site. In this paper the dependency of Cutting parameters, such as blade tip vibration velocity, applied load, tuned frequency and coupling contact conditions, on the thermal response are reported and results show that it is possible to maintain Cutting temperatures within safety limits by controlling the Cutting parameters. A novel Cutting blade design is proposed that reduces frictional heat generated at the cut site. Through a series of experimental investigations using fresh bovine femur it is demonstrated that the Cutting temperature, and hence thermal damage, can be reduced by selecting appropriate Cutting parameters and blade profile.
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A Finite Element Model for Ultrasonic Cutting of Toffee
Applied Mechanics and Materials, 2006Co-Authors: Euan Mcculloch, Alan Macbeath, Margaret LucasAbstract:The performance of an Ultrasonic Cutting device critically relies on the interaction of the Cutting tool and the material to be cut. A finite element (FE) model of Ultrasonic Cutting is developed to enable the design of the Cutting blade to be influenced by the requirements of the tool-material interaction and to allow Cutting parameters to be estimated as an integral part of designing the Cutting blade. In this paper, an application in food processing is considered and FE models of Cutting are demonstrated for toffee; a food product which is typically sticky, highly temperature dependent, and difficult to cut. Two different 2D coupled thermal stress FE models are considered, to simulate Ultrasonic Cutting. The first model utilises the debond option in ABAQUS standard and the second uses the element erosion model in ABAQUS explicit. Both models represent a single blade Ultrasonic Cutting device tuned to a longitudinal mode of vibration Cutting a specimen of toffee. The model allows blade tip geometry, Ultrasonic amplitude, Cutting speed, frequency and Cutting force to be adjusted, in particular to assess the effects of different Cutting blade profiles. The validity of the model is highly dependent on the accuracy of the material data input and on the accuracy of the friction and temperature boundary condition at the blade-material interface. Uniaxial tensile tests are conducted on specimens of toffee for a range of temperatures. This provides temperature dependent stress-strain data, which characterises the material behaviour, to be included in the FE models. Due to the difficulty in gripping the tensile specimens in the test machine, special grips were manufactured to allow the material to be pulled without initiating cracks or causing the specimen to break at the grips. A Coulomb friction condition at the blade-material interface is estimated from experiments, which study the change in the friction coefficient due to Ultrasonic excitation of a surface, made from the same material as the blade, in contact with a specimen of toffee. A model of heat generation at the blade-toffee interface is also included to characterise contact during Ultrasonic Cutting. The failure criterion for the debond model assumes crack propagation will occur when the stress normal to the crack surface reaches the tensile failure stress of toffee and the element erosion model uses a shear failure criterion to initiate element removal. The validity of the models is discussed, providing some insights into the estimation of contact conditions and it is shown how these models can improve design of Ultrasonic Cutting devices.
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P2G-7 Effect of Ultrasonic Cutting Blade Orientation on Cutting Temperature
2006 IEEE Ultrasonics Symposium, 2006Co-Authors: Alan Macbeath, M. Lucas, Andrea CardoniAbstract:Ultrasonic Cutting of bone offers advantages compared with orthopaedic devices that rely on a reciprocating action, including the elimination of swarf, improved cut quality and precision, and reduced reaction forces. The technology has become accepted as an alternative Cutting procedure for use in surgical operations on soft tissue. Recent studies conducted on bovine bone and a bone substitute material have shown that Ultrasonic Cutting results in a precise and fast operation using relatively low forces. Previous work by the authors highlighted the significance of frictional heating during Ultrasonic Cutting, a phenomenon that can lead to material degradation and excessive burning of the cut surface. The work presented a method of reducing Cutting temperature by controlling Ultrasonic Cutting parameters and also presented a method of further reducing Cutting temperature by incorporating blade geometry modifications that reduce friction between the blade and the specimen. Such studies have been concerned with uni-axial Cutting blade orientations, known as guillotine Cutting, and opportunities exist to enhance orthopaedic Ultrasonic Cutting by developing blades that can operate in more than one Cutting direction. This paper investigates the relationship between Cutting parameters (such as Cutting speed, applied load and blade tip vibration velocity) and temperature at locations around the cut site for a synthetic bone material during guillotine and slicing mode Cutting
L. J. Smith - One of the best experts on this subject based on the ideXlab platform.
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Design and characterisation of Ultrasonic Cutting tools
CIRP Annals - Manufacturing Technology, 2001Co-Authors: Margaret Lucas, Andrea Cardoni, Jon N. Petzing, L. J. SmithAbstract:Cutting of food products and other materials with Ultrasonically assisted tools has demonstrated significant benefits including reduced wastage and improved cut quality. However, the success of the technology relies on careful design of the Ultrasonically excited tools and transmission components. In this paper, the different challenges of tool design are discussed with reference to two Cutting devices. The studies demonstrate that accurate characterisation of the vibration behaviour of the tool and an understanding of the effects and limitations on vibration responses of design modifications, allows tool performance to be enhanced in the design. © 2001 CIRP.
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An Ultrasonic blade for Cutting bone
2001Co-Authors: L. J. Smith, Margaret LucasAbstract:Many surgical tools used for Cutting bone have disadvantages such as poor accuracy, poor quality of cut and heat damage. A new tool is required for robotic assist surgical applications that overcomes these deficiencies and minimises reaction forces into the robot. This work presents a feasibility study of Ultrasonically assisted osteotomy and demonstrates the advantages of Ultrasonic Cutting of bone. The results of Ultrasonically assisted bone Cutting trials using bovine cortical bone are presented and compared with results obtained from finite element (FE) models simulating the vibration loading of the blade.Many surgical tools used for Cutting bone have disadvantages such as poor accuracy, poor quality of cut and heat damage. A new tool is required for robotic assist surgical applications that overcomes these deficiencies and minimises reaction forces into the robot. This work presents a feasibility study of Ultrasonically assisted osteotomy and demonstrates the advantages of Ultrasonic Cutting of bone. The results of Ultrasonically assisted bone Cutting trials using bovine cortical bone are presented and compared with results obtained from finite element (FE) models simulating the vibration loading of the blade.
Hiromi Isobe - One of the best experts on this subject based on the ideXlab platform.
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Machinability Improvement on High Speed Ultrasonic Turning - The Effect of Tool Oscillating Direction and Tool Chip Shape
Materials Science Forum, 2016Co-Authors: Keisuke Hara, Ryo Sasaki, Hiromi IsobeAbstract:Ultrasonic Cutting is a technique that can improve machinability such as fine surface, reduce tool worn out and etc. To improve processing speed of Ultrasonic Cutting is difficult due to the effects of tool oscillation are invalidated when Cutting speed exceeds maximum tool oscillating velocity. In previous report, high speed principal direction Ultrasonic turning experiments for stainless steel were carried out to improve processing speed and products quality. In Ultrasonic turning, tool worn out and built up edge generation were reduced compare with ordinary turning. In this study, the effects of tool oscillating direction and tool chip shape for Cutting properties of soft magnetic stainless steel were investigated. Cutting properties such as turned surface roughness, Cutting force and ejected chip were compared.
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Effect of Cutting Speed on Ultrasonically Added Turning in Soft Magnetic Stainless Steel
Advanced Materials Research, 2016Co-Authors: Keisuke Hara, Hiromi IsobeAbstract:Ultrasonic Cutting is a technique that can improve machinability such as fine surface, reduce tool worn out and etc. To improve processing speed of Ultrasonic Cutting is difficult due to the effects of tool oscillation are invalidated when Cutting speed exceeds maximum tool oscillating velocity. In this study, high speed principal direction Ultrasonic turning experiments for soft magnetic stainless steel were carried out to investigate effects of Cutting speed and products quality. Surface roughness, chip worn out and built up edge were investigated in this study. In case of Ultrasonic turning, tool worn out and built up edge generation were reduced compare with ordinary turning. High speed Ultrasonic Cutting can improve Cutting performances in phase of turned surface quality, Cutting force and processing speed.
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A Study of Ultrasonically Added High Speed Turning for Stainless Steel - The Effects of Ultrasonic Oscillating Direction and Chip Breaker Shape and Material
Advanced Materials Research, 2014Co-Authors: Keisuke Hara, Toshihiko Koiwa, Ryo Sasaki, Hiromi IsobeAbstract:Ultrasonic Cutting is a technique that can improve machinability such as fine surface, reduce tool worn out and etc. To improve processing speed of Ultrasonic Cutting is difficult due to the effects of tool oscillation are invalidated when Cutting speed exceeds maximum tool oscillating velocity. In previous report, high speed principal direction Ultrasonic turning without thrust direction vibration experiments for stainless steel were carried out to improve processing speed and products quality. In Ultrasonic turning, tool worn out and built up edge generation were reduced compare with ordinary turning. Fine surface without thrust direction periodically cut marks were obtained in Ultrasonic turning experiments. In this study, the effects of chip breaker shape and insert material were investigated. Surface roughness, chip worn out and built up edge generation were investigated in this study.
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Investigation of Cutting Phenomena in High Speed Ultrasonic Turning
Key Engineering Materials, 2012Co-Authors: Keisuke Hara, Hiromi Isobe, Yoshihiro Take, Daisuke Hashikai, Jun Ishimatsu, Toshihiko KoiwaAbstract:This study investigated phenomena of Ultrasonic Cutting in case of high speed conditions. Ultrasonically assisted Cutting techniques were developed by Kumabe in 1950’s. He found “critical Cutting speed” that limits Cutting speed to obtain Ultrasonically assisted effects and is calculated by frequency and amplitude of oscillation. In general, Ultrasonically assisted Cutting is not suitable for high speed Cutting conditions because the effects of Ultrasonically applying are canceled due to tool contacts with workpiece during Cutting operation. Present Ultrasonically assisted Cutting cannot increase Cutting speed because Cutting speed is limited by above reason. And Ultrasonically assisted Cutting cannot improve productivity due to long processing time. We conducted high speed Ultrasonic Cutting, maximum Cutting speed of this research was 160m/min which is higher than general critical Cutting speed. Workpiece material is JIS SUS304 stainless steed and cemented carbide tool inserts were employed in this research. In ordinary Cutting, generate terrible built up edge on to tool rake face. In case of low amplitude Ultrasonic Cutting, tool rake face hasn’t built up edge and periodically marks by Ultrasonic oscillation were remained on the surface. Cutting phenomena of Ultrasonic Cutting is different compared with ordinary Cutting conditions.
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Investigation for High Speed Ultrasonic Cutting of Aluminum Alloy
Key Engineering Materials, 2012Co-Authors: Keisuke Hara, Hiromi Isobe, Yoshihiro Take, Toshihiko KoiwaAbstract:This study investigated phenomena of Ultrasonic Cutting in the case of high-speed conditions. Ultrasonically assisted Cutting techniques were developed by Kumabe in the 1950s. He found a critical Cutting speed that limits Cutting speed to obtain Ultrasonically assisted effects and is calculated by frequency and amplitude of oscillation. In general, Ultrasonically assisted Cutting is not suitable for high-speed Cutting conditions because the effects of Ultrasonic application are cancelled due to tool contacts with the workpiece during the Cutting operation. Present Ultrasonically assisted Cutting cannot allow increased Cutting speed because Cutting speed is limited by a critical Cutting speed that is less than that compared with general Cutting speed. And Ultrasonically assisted Cutting cannot improve productivity due to long processing time. We conducted high-speed Ultrasonic Cutting, and the maximum Cutting speed in this research was 300 m/min which is higher than general critical Cutting speed. The workpiece material was A5056 and cemented carbide tool inserts were employed in this research. Without Ultrasonic oscillation, machined surface retained some built up edge and surface roughness is 28 μmRz. In the case of Ultrasonic Cutting, surface hasnt built up edge and periodically marks due to Ultrasonic oscillation remained on the surface. The roughness of conventionally cut surface is better than in Ultrasonic Cutting. The Cutting phenomena of Ultrasonic Cutting are different compared with those under conventional Cutting conditions.
