The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform

P P Hed - One of the best experts on this subject based on the ideXlab platform.

  • calculations of material removal removal rate and preston coefficient in continuous lapping Polishing Machines
    1993
    Co-Authors: P P Hed
    Abstract:

    Lapping and Polishing Machines usually do not have deterministic model to pre-determine removal rate and total material to be removed. The removal process is mainly affected by relative motion between the lap and the substrates, by load applied, and by mechano-chemical characteristics of the substrate material, as well as the abrasive and lap materials. Therefore, frequent measurements of the removal is necessary. This paper, written for optical technicians, includes formulas to calculate material removal from mass loss and removal rate from mass loss during operation. Establishing the removal rate helps by reducing the frequency of intermediate thickness measurements. The paper also includes the calculation of Preston coefficient, which is a measure of lapping process efficiency.

  • Calculations of material removal, removal rate, and Preston coefficient in continuous lapping/Polishing Machines
    1993
    Co-Authors: P P Hed
    Abstract:

    Lapping and Polishing Machines usually do not have deterministic model to pre-determine removal rate and total material to be removed. The removal process is mainly affected by relative motion between the lap and the substrates, by load applied, and by mechano-chemical characteristics of the substrate material, as well as the abrasive and lap materials. Therefore, frequent measurements of the removal is necessary. This paper, written for optical technicians, includes formulas to calculate material removal from mass loss and removal rate from mass loss during operation. Establishing the removal rate helps by reducing the frequency of intermediate thickness measurements. The paper also includes the calculation of Preston coefficient, which is a measure of lapping process efficiency.

Fu Y - One of the best experts on this subject based on the ideXlab platform.

  • A study of computer controlled ultra-precision Polishing of silicon carbide reflecting lenses for enhancing surface roughness
    Scientific.Net, 2015
    Co-Authors: Li Z, Wb Lee, Cf Cheung, Fu Y
    Abstract:

    5th International Conference on Asian Society for Precision Engineering and Nanotechnology, ASPEN 2013, Taipei, 12-15 November 2013Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in Polishing SiC is still of a concern. There are advanced ultra-precision Polishing Machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for Polishing process. In this paper, A computer controlled ultra-precision Polishing (CCUP) method based on mechanical Polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision Polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional Polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, Polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective Polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.Department of Industrial and Systems EngineeringRefereed conference pape

  • A study of computer controlled ultra-precision Polishing of silicon carbide reflecting lenses for enhancing surface roughness
    'Trans Tech Publications Ltd.', 2015
    Co-Authors: Li Z, Wb Lee, Cf Cheung, Fu Y
    Abstract:

    5th International Conference on Asian Society for Precision Engineering and Nanotechnology, ASPEN 2013, Taipei, 12-15 November 2013Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in Polishing SiC is still of a concern. There are advanced ultra-precision Polishing Machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for Polishing process. In this paper, A computer controlled ultra-precision Polishing (CCUP) method based on mechanical Polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision Polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional Polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, Polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective Polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.Department of Industrial and Systems Engineering2014-2015 > Academic research: refereed > Refereed conference pape

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

Li Z - One of the best experts on this subject based on the ideXlab platform.

  • A study of computer controlled ultra-precision Polishing of silicon carbide reflecting lenses for enhancing surface roughness
    Scientific.Net, 2015
    Co-Authors: Li Z, Wb Lee, Cf Cheung, Fu Y
    Abstract:

    5th International Conference on Asian Society for Precision Engineering and Nanotechnology, ASPEN 2013, Taipei, 12-15 November 2013Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in Polishing SiC is still of a concern. There are advanced ultra-precision Polishing Machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for Polishing process. In this paper, A computer controlled ultra-precision Polishing (CCUP) method based on mechanical Polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision Polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional Polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, Polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective Polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.Department of Industrial and Systems EngineeringRefereed conference pape

  • A study of computer controlled ultra-precision Polishing of silicon carbide reflecting lenses for enhancing surface roughness
    'Trans Tech Publications Ltd.', 2015
    Co-Authors: Li Z, Wb Lee, Cf Cheung, Fu Y
    Abstract:

    5th International Conference on Asian Society for Precision Engineering and Nanotechnology, ASPEN 2013, Taipei, 12-15 November 2013Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in Polishing SiC is still of a concern. There are advanced ultra-precision Polishing Machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for Polishing process. In this paper, A computer controlled ultra-precision Polishing (CCUP) method based on mechanical Polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision Polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional Polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, Polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective Polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.Department of Industrial and Systems Engineering2014-2015 > Academic research: refereed > Refereed conference pape

Yue Gang Fu - One of the best experts on this subject based on the ideXlab platform.

  • A Study of Computer Controlled Ultra-Precision Polishing of Silicon Carbide Reflecting Lenses for Enhancing Surface Roughness
    Key Engineering Materials, 2014
    Co-Authors: Zhuo Lin Li, Lai Ting Ho, Benny C. F. Cheung, Yue Gang Fu
    Abstract:

    Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in Polishing SiC is still of a concern. There are advanced ultra-precision Polishing Machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for Polishing process. In this paper, A computer controlled ultra-precision Polishing (CCUP) method based on mechanical Polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision Polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional Polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, Polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective Polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.