The Experts below are selected from a list of 52491 Experts worldwide ranked by ideXlab platform

Albert J Shih - One of the best experts on this subject based on the ideXlab platform.

  • tool path planning for near dry edm milling with Lead Angle on curved surfaces
    Journal of Manufacturing Science and Engineering-transactions of The Asme, 2011
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    This research investigates the strategy to achieve high material removal rate in tool path planning for the near-dry electrical discharge machining (EDM) milling process using tubular electrode with a Lead Angle. The proposed strategy to prevent leakage of dielectric mist from the tubular electrode is different from the conventional end milling process due to the difference in material removal mechanism. Tool positions and orientations to engage the electrode into workpiece, machining of workpiece edge, minimum Lead Angle to machine a curved surface, and minimum and maximum path interval to prevent the mist leakage are derived. Experiments are conducted to validate the model prediction of path planning. Experimental results show plunge method has the highest material removal rate for engaging method, and electrode hole must be located within the workpiece surface when edge of workpiece is machined. For curvature machining, the proposed path planning strategy yields higher material removal rate compared with that from the conventional strategy, which only avoids gouging. This study also reveals that, due to the tool wear and crowning of electrode tip, it is difficult to accurately determine the minimum path interval which will cause the mist leakage.

  • gap control for near dry edm milling with Lead Angle
    International Journal of Machine Tools & Manufacture, 2011
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    A new gap control strategy for five-axis milling using near-dry electrical discharge machining (EDM) has been experimentally investigated. The conventional EDM control strategy only allows the retraction of the electrode in the direction of machining trajectory, which results in inefficient gap control when the electrode is not perpendicular to the workpiece. The new gap controller is capable of retracting the electrode in the direction of its orientation. This enables more efficient enlargement of the discharge gap Leading to faster recovery of average gap voltage. Experimental results show a 30% increase in material removal rate while the tool electrode wear ratio and surface roughness are not affected. Furthermore, EDM efficiency is improved due to the change in the electrode retraction in its axial direction. The gain tuning of the proposed controller is also discussed. This study shows the direction of electrode retraction is important for five-axis near-dry EDM milling.

  • Gap control for near-dry EDM milling with Lead Angle
    International Journal of Machine Tools and Manufacture, 2011
    Co-Authors: Masahiro Fujiki, Gap-yong Kim, Albert J Shih
    Abstract:

    A new gap control strategy for five-axis milling using near-dry electrical discharge machining (EDM) has been experimentally investigated. The conventional EDM control strategy only allows the retraction of the electrode in the direction of machining trajectory, which results in inefficient gap control when the electrode is not perpendicular to the workpiece. The new gap controller is capable of retracting the electrode in the direction of its orientation. This enables more efficient enlargement of the discharge gap Leading to faster recovery of average gap voltage. Experimental results show a 30% increase in material removal rate while the tool electrode wear ratio and surface roughness are not affected. Furthermore, EDM efficiency is improved due to the change in the electrode retraction in its axial direction. The gain tuning of the proposed controller is also discussed. This study shows the direction of electrode retraction is important for five-axis near-dry EDM milling.

  • investigation of the effects of electrode orientation and fluid flow rate in near dry edm milling
    International Journal of Machine Tools & Manufacture, 2009
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    This research investigates the effects of electrode Lead and tilt Angles and dielectric fluid flow rate on material removal rate, tool electrode wear ratio, and surface roughness in near-dry electrical discharge machining (EDM) milling process. Computational fluid dynamics (CFD) model is developed to predict the dielectric fluid flow rate and qualitatively compare with the experimentally measured EDM material removal rate. The optimum Lead Angle, which maximized material removal rate and minimized tool electrode wear ratio, was found. The decrease in the Lead Angle has a negative effect on the roughness of machined surface. The increase in tilt Angle reduces the material removal rate and increases the tool electrode wear ratio. The change in tilt Angle does not have a significant effect on the surface roughness and can be used to prevent gouging in finishing EDM milling. This study shows that the material removal rate is linearly proportional to the mass flow rate of air and kerosene mixture, the tool electrode wear ratio is inversely related to the mass flow rate of air and kerosene mixture, and the average surface roughness does not have a good correlation with the flow rate of the mixture.

André R. Studart - One of the best experts on this subject based on the ideXlab platform.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    3D-printed soft actuators have limited motion and are far from reaching the level of complexity found in biological systems. Here the authors present a multimaterial 3D printing platform for the fabrication of soft actuators displaying a wide range of motions that are programmable. Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.

Masahiro Fujiki - One of the best experts on this subject based on the ideXlab platform.

  • tool path planning for near dry edm milling with Lead Angle on curved surfaces
    Journal of Manufacturing Science and Engineering-transactions of The Asme, 2011
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    This research investigates the strategy to achieve high material removal rate in tool path planning for the near-dry electrical discharge machining (EDM) milling process using tubular electrode with a Lead Angle. The proposed strategy to prevent leakage of dielectric mist from the tubular electrode is different from the conventional end milling process due to the difference in material removal mechanism. Tool positions and orientations to engage the electrode into workpiece, machining of workpiece edge, minimum Lead Angle to machine a curved surface, and minimum and maximum path interval to prevent the mist leakage are derived. Experiments are conducted to validate the model prediction of path planning. Experimental results show plunge method has the highest material removal rate for engaging method, and electrode hole must be located within the workpiece surface when edge of workpiece is machined. For curvature machining, the proposed path planning strategy yields higher material removal rate compared with that from the conventional strategy, which only avoids gouging. This study also reveals that, due to the tool wear and crowning of electrode tip, it is difficult to accurately determine the minimum path interval which will cause the mist leakage.

  • gap control for near dry edm milling with Lead Angle
    International Journal of Machine Tools & Manufacture, 2011
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    A new gap control strategy for five-axis milling using near-dry electrical discharge machining (EDM) has been experimentally investigated. The conventional EDM control strategy only allows the retraction of the electrode in the direction of machining trajectory, which results in inefficient gap control when the electrode is not perpendicular to the workpiece. The new gap controller is capable of retracting the electrode in the direction of its orientation. This enables more efficient enlargement of the discharge gap Leading to faster recovery of average gap voltage. Experimental results show a 30% increase in material removal rate while the tool electrode wear ratio and surface roughness are not affected. Furthermore, EDM efficiency is improved due to the change in the electrode retraction in its axial direction. The gain tuning of the proposed controller is also discussed. This study shows the direction of electrode retraction is important for five-axis near-dry EDM milling.

  • Gap control for near-dry EDM milling with Lead Angle
    International Journal of Machine Tools and Manufacture, 2011
    Co-Authors: Masahiro Fujiki, Gap-yong Kim, Albert J Shih
    Abstract:

    A new gap control strategy for five-axis milling using near-dry electrical discharge machining (EDM) has been experimentally investigated. The conventional EDM control strategy only allows the retraction of the electrode in the direction of machining trajectory, which results in inefficient gap control when the electrode is not perpendicular to the workpiece. The new gap controller is capable of retracting the electrode in the direction of its orientation. This enables more efficient enlargement of the discharge gap Leading to faster recovery of average gap voltage. Experimental results show a 30% increase in material removal rate while the tool electrode wear ratio and surface roughness are not affected. Furthermore, EDM efficiency is improved due to the change in the electrode retraction in its axial direction. The gain tuning of the proposed controller is also discussed. This study shows the direction of electrode retraction is important for five-axis near-dry EDM milling.

  • investigation of the effects of electrode orientation and fluid flow rate in near dry edm milling
    International Journal of Machine Tools & Manufacture, 2009
    Co-Authors: Masahiro Fujiki, Jun Ni, Albert J Shih
    Abstract:

    This research investigates the effects of electrode Lead and tilt Angles and dielectric fluid flow rate on material removal rate, tool electrode wear ratio, and surface roughness in near-dry electrical discharge machining (EDM) milling process. Computational fluid dynamics (CFD) model is developed to predict the dielectric fluid flow rate and qualitatively compare with the experimentally measured EDM material removal rate. The optimum Lead Angle, which maximized material removal rate and minimized tool electrode wear ratio, was found. The decrease in the Lead Angle has a negative effect on the roughness of machined surface. The increase in tilt Angle reduces the material removal rate and increases the tool electrode wear ratio. The change in tilt Angle does not have a significant effect on the surface roughness and can be used to prevent gouging in finishing EDM milling. This study shows that the material removal rate is linearly proportional to the mass flow rate of air and kerosene mixture, the tool electrode wear ratio is inversely related to the mass flow rate of air and kerosene mixture, and the average surface roughness does not have a good correlation with the flow rate of the mixture.

Manuel Schaffner - One of the best experts on this subject based on the ideXlab platform.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    3D-printed soft actuators have limited motion and are far from reaching the level of complexity found in biological systems. Here the authors present a multimaterial 3D printing platform for the fabrication of soft actuators displaying a wide range of motions that are programmable. Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.

Patrick A Ruhs - One of the best experts on this subject based on the ideXlab platform.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    3D-printed soft actuators have limited motion and are far from reaching the level of complexity found in biological systems. Here the authors present a multimaterial 3D printing platform for the fabrication of soft actuators displaying a wide range of motions that are programmable. Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.

  • 3D printing of robotic soft actuators with programmable bioinspired architectures
    Nature Communications, 2018
    Co-Authors: Manuel Schaffner, Jakob A. Faber, Lucas Pianegonda, Fergal Coulter, Patrick A Ruhs, André R. Studart
    Abstract:

    Soft actuation allows robots to interact safely with humans, other machines, and their surroundings. Full exploitation of the potential of soft actuators has, however, been hindered by the lack of simple manufacturing routes to generate multimaterial parts with intricate shapes and architectures. Here, we report a 3D printing platform for the seamless digital fabrication of pneumatic silicone actuators exhibiting programmable bioinspired architectures and motions. The actuators comprise an elastomeric body whose surface is decorated with reinforcing stripes at a well-defined Lead Angle. Similar to the fibrous architectures found in muscular hydrostats, the Lead Angle can be altered to achieve elongation, contraction, or twisting motions. Using a quantitative model based on lamination theory, we establish design principles for the digital fabrication of silicone-based soft actuators whose functional response is programmed within the material's properties and architecture. Exploring such programmability enables 3D printing of a broad range of soft morphing structures.