The Experts below are selected from a list of 15453 Experts worldwide ranked by ideXlab platform

Hiroyasu Iwabe - One of the best experts on this subject based on the ideXlab platform.

  • effect of tool stiffness upon tool wear in high spindle speed Milling using small ball End Mill
    Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2001
    Co-Authors: Takashi Miyaguchi, Etsuo Takeoka, Masami Masuda, Hiroyasu Iwabe
    Abstract:

    Longer tool life can be tentatively achieved at a higher feed rate using a small ball End Mill in high spindle speed Milling (over several tens of thousands of revolutions per minute), although the mechanism by which tool life is improved has not yet been clarified. In the present paper, the mechanism of tool wear is investigated with respect to the deviation in cutting force and the deflection of a ball End Mill with two cutting edges. The vector loci of the cutting forces are shown to correlate strongly with wear on both cutting edges of ball End Mills having various tool stiffnesses related to the tool length. The results clarified that tool life can be prolonged by reducing tool stiffness, because the cutting forces are balanced, resulting in even tool wear on both cutting edges as tool stiffness is lowered to almost the breakage limit of the End Mill. A ball End Mill with an optimal tool length showed significant improvement in tool life in the Milling of forging die models.

  • Effect of tool stiffness upon tool wear in high spindle speed Milling using small ball End Mill
    Precision Engineering, 2001
    Co-Authors: Takashi Miyaguchi, Etsuo Takeoka, Masami Masuda, Hiroyasu Iwabe
    Abstract:

    Longer tool life can be tentatively achieved at a higher feed rate using a small ball End Mill in high spindle speed Milling (over several tens of thousands of revolutions per minute), although the mechanism by which tool life is improved has not yet been clarified. In the present paper, the mechanism of tool wear is investigated with respect to the deviation in cutting force and the deflection of a ball End Mill with two cutting edges. The vector loci of the cutting forces are shown to correlate strongly with wear on both cutting edges of ball End Mills having various tool stiffnesses related to the tool length. The results clarified that tool life can be prolonged by reducing tool stiffness, because the cutting forces are balanced, resulting in even tool wear on both cutting edges as tool stiffness is lowered to almost the breakage limit of the End Mill. A ball End Mill with an optimal tool length showed significant improvement in tool life in the Milling of forging die models. © 2001 Elsevier Science Inc.

  • Influence of Eccentricity of Helical End Mill on Working Accuracy.
    Journal of The Japan Society for Precision Engineering, 1995
    Co-Authors: Hiroyasu Iwabe, Hiroshi Mitsuboshi
    Abstract:

    It is very difficult to obtain high accurate surface by a helical End Mill even if finishing condition is selected. The reason is that there is the eccentricity of the axis of the cutter center from the axis of machine spindle. But the surface generation mechanism of by End Mills eccentrically attached to the main spindle has not been analyzed. This paper therefore tries to analyze the position of helical edge in the state of eccentricity, and aims at presenting the influence of helix angle and number of teeth on working accuracy. The main results are as follows : (1) The eccentric model for analysis of edge position of the helical End Mill that attached on the machine spindle with eccentric condition is proposed, and the calculating method of the envelope surface by helical edge is shown. (2) The four eccentric parameters of the End Mill are calculated by using displacements of two rings mounted on the End Mill, and the envelope surface is calculated based on the above parameters. (3) It is shown that the shape of machined surface by finishing is almost coincident to that of the envelope surface. (4) The simulation analysis of the envelope surface by helical edge is performed, and it is shown that the influence of helix angle and number of teeth on the shape of envelope surface and the dimensional and shape errors.

  • Prediction of Cutting Force in End Milling (Simple Prediction Method by Sperposition).
    Transactions of the Japan Society of Mechanical Engineers. C, 1991
    Co-Authors: Hiroyasu Iwabe, Akihiko Koizumi, Yoshiya Fujii, Toshihiko Asami
    Abstract:

    This paper proposes a simple and accurate method for the prediction of the cutting force in End Milling. The cutting force in End Milling of a thick plate can be predicted by adding the cutting forces in End Milling of a thin plate. The following were obtained from the comparison of the predicted cutting force with the experimental results. (1) The error of the predicted cutting force is reduced with a increased helix angle of the cutting edge of the End Mill and a decreased radial depth of cut. (2) The error of the predicted cutting force of a 1-tooth End Mill is less than about 200N under cutting conditions of 2∼10mm radial and 2∼20mm axial depth of cut and 10°∼50° helix angle. The maximum error occurs at the helix angle of 10°, but the ratio of the error to the maximum cutting force is less than 10%. (4) The cutting force of a 4-tooth End Mill can be predicted by superposition of that of a 1-tooth End Mill. The maximum error and ratio are also less than 200N and 10% respectively.

Kazuyoshi Shinma - One of the best experts on this subject based on the ideXlab platform.

  • Accuracy Measurement and Evaluation of Straight Bevel Gear Manufactured by End Mill Using CNC Milling Machine
    Journal of Mechanical Design Transactions of the ASME, 2009
    Co-Authors: Kazumasa Kawasaki, Kazuyoshi Shinma
    Abstract:

    Straight bevel gears are usually manufactured with various machines and systems, and the tooth profiles are produced by grinding or machining by means of a tool with many cutting edges. In recent years, the straight bevel gear has been manufactured by an End Mill using a computer numerical control (CNC) Milling machine because the use of the auxiliary apparatus, special cutters, and special machine tools is not needed. Using this method, the gear manufacturing with high accuracy is an important problem. In this paper, the coordinate measurement of the straight bevel gear manufactured in this method is performed and the gear accuracy is evaluated. The tooth profiles of the straight bevel gear generated by a quasi-complementary crown gear instead of a conventional complementary crown gear are introduced. For this study, the tooth profiles of the straight bevel gear were modeled using a 3D computer-aided design system and the gear was manufactured by an End Mill using a CNC Milling machine based on a computeraided manufacturing process. Afterward, the coordinates of many points on the gear tooth surfaces were measured at random using a coordinate measuring machine. This coordinate measurement provides the information about the factors related to the gear accuracy such as pressure angle, tooth angle error, workpiece setting angle, apex to back, and so on. Therefore, the values of the above factors were estimated and were compared with the theoretical ones, respectively. Copyright © 2009 by ASME.

  • Accuracy of straight bevel gear by End Mill using CNC Milling machine
    2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference DETC2007, 2008
    Co-Authors: Kazumasa Kawasaki, Kazuyoshi Shinma
    Abstract:

    Straight bevel gears are usually manufactured with various machines and systems, and the tooth profiles are produced by grinding or machining by means of a tool with many cutting edges. In recent years, the straight bevel gear has been manufactured by an End Mill using a CNC Milling machine because the use of the auxiliary apparatus, special cutters, and special machine tools are not needed. Using this method, the gear manufacturing with high accuracy is important problem. In this paper, the coordinate measurement of the straight bevel gear manufactured in this method is performed and the gear accuracy is evaluated. The tooth profiles of a straight bevel gear generated by a quasi-complementary crown gear instead of a conventional complementary crown gear is introduced. For this study, first the tooth profiles of the straight bevel gear were modeled using a 3D-CAD system and the gear was manufactured by an End Mill using a CNC Milling machine based on a CAM process. Afterward, the coordinates of many points on the gear tooth surfaces were measured at random using a coordinate measuring machine. This coordinate measurement provides the information about the factors relation to the gear accuracy such as pressure angle, tooth angle error, root cone angle, and apex to back and so on. Therefore, the values of the above factors were estimated and were compared with the theoretical ones, respectively. Copyright © 2007 by ASME.

Takashi Miyaguchi - One of the best experts on this subject based on the ideXlab platform.

  • effect of tool stiffness upon tool wear in high spindle speed Milling using small ball End Mill
    Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2001
    Co-Authors: Takashi Miyaguchi, Etsuo Takeoka, Masami Masuda, Hiroyasu Iwabe
    Abstract:

    Longer tool life can be tentatively achieved at a higher feed rate using a small ball End Mill in high spindle speed Milling (over several tens of thousands of revolutions per minute), although the mechanism by which tool life is improved has not yet been clarified. In the present paper, the mechanism of tool wear is investigated with respect to the deviation in cutting force and the deflection of a ball End Mill with two cutting edges. The vector loci of the cutting forces are shown to correlate strongly with wear on both cutting edges of ball End Mills having various tool stiffnesses related to the tool length. The results clarified that tool life can be prolonged by reducing tool stiffness, because the cutting forces are balanced, resulting in even tool wear on both cutting edges as tool stiffness is lowered to almost the breakage limit of the End Mill. A ball End Mill with an optimal tool length showed significant improvement in tool life in the Milling of forging die models.

  • Effect of tool stiffness upon tool wear in high spindle speed Milling using small ball End Mill
    Precision Engineering, 2001
    Co-Authors: Takashi Miyaguchi, Etsuo Takeoka, Masami Masuda, Hiroyasu Iwabe
    Abstract:

    Longer tool life can be tentatively achieved at a higher feed rate using a small ball End Mill in high spindle speed Milling (over several tens of thousands of revolutions per minute), although the mechanism by which tool life is improved has not yet been clarified. In the present paper, the mechanism of tool wear is investigated with respect to the deviation in cutting force and the deflection of a ball End Mill with two cutting edges. The vector loci of the cutting forces are shown to correlate strongly with wear on both cutting edges of ball End Mills having various tool stiffnesses related to the tool length. The results clarified that tool life can be prolonged by reducing tool stiffness, because the cutting forces are balanced, resulting in even tool wear on both cutting edges as tool stiffness is lowered to almost the breakage limit of the End Mill. A ball End Mill with an optimal tool length showed significant improvement in tool life in the Milling of forging die models. © 2001 Elsevier Science Inc.

Akira Saito - One of the best experts on this subject based on the ideXlab platform.

  • A novel deep groove machining method utilizing variable-pitch End Mill with feed-directional thin support
    Precision Engineering, 2016
    Co-Authors: Eiji Shamoto, Akira Saito
    Abstract:

    A novel method for deep groove machining is developed which utilizes a long-shank variable-pitch End Mill with a feed-directional thin support in this research. Recently, thin and tall ribs are required for many parts to reduce their weight and material consumption without sacrificing their stiffness and strength. It leads to necessity of deep and narrow grooves in dies and molds for their mass production. However, such deep groove machining is difficult, since long flexible End Mills cause severe chatter vibrations induced by regeneration and mode-coupling. There have been many studies on the regenerative chatter vibration, while there have been few studies on the mode-coupling chatter vibration. Both chatter vibrations need to be suppressed in the deep groove machining. In this study, the regenerative chatter vibration is suppressed by employing one of the conventional methods, i.e. a variable-pitch End Mill. On the other hand, there is not a good method to suppress the mode-coupling chatter vibration in the deep groove machining. Therefore, a new suppression method is proposed in which the long-shank variable-pitch End Mill is supported with a thin plate in the feed direction. The support device and the long-shank variable-pitch End Mill are developed and applied to machining of hardened die steel. Validity of the proposed method is verified both analytically and experimentally in this study.

Kazumasa Kawasaki - One of the best experts on this subject based on the ideXlab platform.

  • Accuracy Measurement and Evaluation of Straight Bevel Gear Manufactured by End Mill Using CNC Milling Machine
    Journal of Mechanical Design Transactions of the ASME, 2009
    Co-Authors: Kazumasa Kawasaki, Kazuyoshi Shinma
    Abstract:

    Straight bevel gears are usually manufactured with various machines and systems, and the tooth profiles are produced by grinding or machining by means of a tool with many cutting edges. In recent years, the straight bevel gear has been manufactured by an End Mill using a computer numerical control (CNC) Milling machine because the use of the auxiliary apparatus, special cutters, and special machine tools is not needed. Using this method, the gear manufacturing with high accuracy is an important problem. In this paper, the coordinate measurement of the straight bevel gear manufactured in this method is performed and the gear accuracy is evaluated. The tooth profiles of the straight bevel gear generated by a quasi-complementary crown gear instead of a conventional complementary crown gear are introduced. For this study, the tooth profiles of the straight bevel gear were modeled using a 3D computer-aided design system and the gear was manufactured by an End Mill using a CNC Milling machine based on a computeraided manufacturing process. Afterward, the coordinates of many points on the gear tooth surfaces were measured at random using a coordinate measuring machine. This coordinate measurement provides the information about the factors related to the gear accuracy such as pressure angle, tooth angle error, workpiece setting angle, apex to back, and so on. Therefore, the values of the above factors were estimated and were compared with the theoretical ones, respectively. Copyright © 2009 by ASME.

  • Accuracy of straight bevel gear by End Mill using CNC Milling machine
    2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference DETC2007, 2008
    Co-Authors: Kazumasa Kawasaki, Kazuyoshi Shinma
    Abstract:

    Straight bevel gears are usually manufactured with various machines and systems, and the tooth profiles are produced by grinding or machining by means of a tool with many cutting edges. In recent years, the straight bevel gear has been manufactured by an End Mill using a CNC Milling machine because the use of the auxiliary apparatus, special cutters, and special machine tools are not needed. Using this method, the gear manufacturing with high accuracy is important problem. In this paper, the coordinate measurement of the straight bevel gear manufactured in this method is performed and the gear accuracy is evaluated. The tooth profiles of a straight bevel gear generated by a quasi-complementary crown gear instead of a conventional complementary crown gear is introduced. For this study, first the tooth profiles of the straight bevel gear were modeled using a 3D-CAD system and the gear was manufactured by an End Mill using a CNC Milling machine based on a CAM process. Afterward, the coordinates of many points on the gear tooth surfaces were measured at random using a coordinate measuring machine. This coordinate measurement provides the information about the factors relation to the gear accuracy such as pressure angle, tooth angle error, root cone angle, and apex to back and so on. Therefore, the values of the above factors were estimated and were compared with the theoretical ones, respectively. Copyright © 2007 by ASME.