The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

Ioan D. Marinescu - One of the best experts on this subject based on the ideXlab platform.

  • Grind/Lap of Ceramics with UV-Bonded Diamond Wheels
    Handbook of Ceramics Grinding and Polishing, 2014
    Co-Authors: Qiuyun Huang, Ioan D. Marinescu
    Abstract:

    Abstract In conventional lapping process, the lapping efficiency is limited due to the abrasion mechanism that is illustrated as three-body abrasion. In order to improve the efficiency and surface finish, a fine grinding or grind/lap process is proposed and studied in this research. First of all, the material properties of the ultraviolet-curable Resin and mixture are investigated and the optimum combination of Resin and diamond abrasive was selected. Besides, kinematics of the grind/lap was analyzed to study its influence on the performance of the Resin Bonded Wheel. Moreover, based on experimental results analysis, the mechanism for grind/lap process was proposed, and it is considered as a combination of conventional grinding and lapping process. At last, two ways to improve the performance of Wheel were carried out and the results were compared.

Qingliang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • On-machine precision form truing of arc-shaped diamond Wheels
    Journal of Materials Processing Technology, 2015
    Co-Authors: Bing Chen, Qingliang Zhao
    Abstract:

    Abstract In order to realize the efficient and precision truing of arc-shaped diamond Wheel for precision grinding of spherical, aspherical and free-form surfaces, a novel on-machine precision form truing of Resin and metal Bonded arc-shaped diamond Wheels is proposed utilizing rotary green silicon carbon (GC) rod. Through this on-machine rotary GC rod (ORGCR) mutual-wear truing, any required radius of Wheel arc profile could be formed by programmed truing paths, meanwhile, the vertical direction position error of the Wheel center could be corrected after truing. Firstly, the principle of ORGCR mutual-wear truing for arc-shaped diamond Wheel was introduced, and new evaluation methods of truing performance and truing ratio were provided. Then the truing performance and truing ratio were observed for different grains and bond of arc-shaped diamond Wheels, the effects of ORGCR mutual-wear truing parameters on profile radius and form accuracy of Wheels were investigated. Finally, the convex aspherical surface of single crystal silicon was ground by trued arc-shaped diamond Wheel. The experimental results showed that the Resin and metal Bonded diamond Wheels could be efficiently and precisely trued with high truing ratio. The form error of Wheel arc profile reached 2.5–6 μm/3 mm which decreased about 90% compared to pre-truing Wheel. Besides, the diamond grains were well distributed on the Wheel surface, and protruded out of the Wheel bond after truing. The precision aspherical surface of single crystal silicon with the form accuracy PV of 507 nm and the average roughness Ra of 57.1 nm was achieved by parallel grinding with the trued D7 Resin Bonded Wheel.

  • Precision truing of diamond Wheel with sharp edge
    7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 2014
    Co-Authors: Cheng Ge, Qingliang Zhao, Bing Chen, Jinhu Wang
    Abstract:

    Diamond Wheel with sharp edge has small contour structures, which can lead to fast wear of Wheel in the grinding process. Traditional truing methods are hard to apply to this kind of Wheels. Therefore, as for the difficulty of precision truing of diamond Wheel with sharp edge, the novel methods for Resin and metal Bonded diamond Wheels with sharp edge are presented, respectively. In this experiment, a conditioning procedure with rare metal alloy block Ta was used to true the Resin Bonded diamond grinding Wheel and in the same way Nb alloy block was utilized to complete rough truing of metal Bonded diamond grinding Wheel. Then a CNC truing technique with rotational green carbide (GC) truing stick was applied to precise truing of metal Bonded diamond grinding Wheel. Methods mentioned above were measured in order to evaluate the performance of truing. Geometric features of the Wheel sharp edge were duplicated on the organic glass (PMMA) in order to measure and calculate the radius of the sharp edge. The edge radius of trued Resin Bonded Wheel and metal Bonded Wheel is perceived as an important assessment. The experiments results revealed that the edge radius of 12.45μm for the Resin Bonded Wheel and the edge radius of 30.17μm for the metal Bonded Wheel could be achieved.

Qiuyun Huang - One of the best experts on this subject based on the ideXlab platform.

  • Grind/Lap of Ceramics with UV-Bonded Diamond Wheels
    Handbook of Ceramics Grinding and Polishing, 2014
    Co-Authors: Qiuyun Huang, Ioan D. Marinescu
    Abstract:

    Abstract In conventional lapping process, the lapping efficiency is limited due to the abrasion mechanism that is illustrated as three-body abrasion. In order to improve the efficiency and surface finish, a fine grinding or grind/lap process is proposed and studied in this research. First of all, the material properties of the ultraviolet-curable Resin and mixture are investigated and the optimum combination of Resin and diamond abrasive was selected. Besides, kinematics of the grind/lap was analyzed to study its influence on the performance of the Resin Bonded Wheel. Moreover, based on experimental results analysis, the mechanism for grind/lap process was proposed, and it is considered as a combination of conventional grinding and lapping process. At last, two ways to improve the performance of Wheel were carried out and the results were compared.

Bing Chen - One of the best experts on this subject based on the ideXlab platform.

  • On-machine precision form truing of arc-shaped diamond Wheels
    Journal of Materials Processing Technology, 2015
    Co-Authors: Bing Chen, Qingliang Zhao
    Abstract:

    Abstract In order to realize the efficient and precision truing of arc-shaped diamond Wheel for precision grinding of spherical, aspherical and free-form surfaces, a novel on-machine precision form truing of Resin and metal Bonded arc-shaped diamond Wheels is proposed utilizing rotary green silicon carbon (GC) rod. Through this on-machine rotary GC rod (ORGCR) mutual-wear truing, any required radius of Wheel arc profile could be formed by programmed truing paths, meanwhile, the vertical direction position error of the Wheel center could be corrected after truing. Firstly, the principle of ORGCR mutual-wear truing for arc-shaped diamond Wheel was introduced, and new evaluation methods of truing performance and truing ratio were provided. Then the truing performance and truing ratio were observed for different grains and bond of arc-shaped diamond Wheels, the effects of ORGCR mutual-wear truing parameters on profile radius and form accuracy of Wheels were investigated. Finally, the convex aspherical surface of single crystal silicon was ground by trued arc-shaped diamond Wheel. The experimental results showed that the Resin and metal Bonded diamond Wheels could be efficiently and precisely trued with high truing ratio. The form error of Wheel arc profile reached 2.5–6 μm/3 mm which decreased about 90% compared to pre-truing Wheel. Besides, the diamond grains were well distributed on the Wheel surface, and protruded out of the Wheel bond after truing. The precision aspherical surface of single crystal silicon with the form accuracy PV of 507 nm and the average roughness Ra of 57.1 nm was achieved by parallel grinding with the trued D7 Resin Bonded Wheel.

  • Precision truing of diamond Wheel with sharp edge
    7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 2014
    Co-Authors: Cheng Ge, Qingliang Zhao, Bing Chen, Jinhu Wang
    Abstract:

    Diamond Wheel with sharp edge has small contour structures, which can lead to fast wear of Wheel in the grinding process. Traditional truing methods are hard to apply to this kind of Wheels. Therefore, as for the difficulty of precision truing of diamond Wheel with sharp edge, the novel methods for Resin and metal Bonded diamond Wheels with sharp edge are presented, respectively. In this experiment, a conditioning procedure with rare metal alloy block Ta was used to true the Resin Bonded diamond grinding Wheel and in the same way Nb alloy block was utilized to complete rough truing of metal Bonded diamond grinding Wheel. Then a CNC truing technique with rotational green carbide (GC) truing stick was applied to precise truing of metal Bonded diamond grinding Wheel. Methods mentioned above were measured in order to evaluate the performance of truing. Geometric features of the Wheel sharp edge were duplicated on the organic glass (PMMA) in order to measure and calculate the radius of the sharp edge. The edge radius of trued Resin Bonded Wheel and metal Bonded Wheel is perceived as an important assessment. The experiments results revealed that the edge radius of 12.45μm for the Resin Bonded Wheel and the edge radius of 30.17μm for the metal Bonded Wheel could be achieved.

E. Lilley - One of the best experts on this subject based on the ideXlab platform.

  • Innovative grinding Wheel design for cost-effective machining of advanced ceramics. Phase I, final report
    1996
    Co-Authors: R.h. Licht, S. Ramanath, M. Simpson, E. Lilley
    Abstract:

    Norton Company successfully completed the 16-month Phase I technical effort to define requirements, design, develop, and evaluate a next-generation grinding Wheel for cost-effective cylindrical grinding of advanced ceramics. This program was a cooperative effort involving three Norton groups representing a superabrasive grinding Wheel manufacturer, a diamond film manufacturing division and a ceramic research center. The program was divided into two technical tasks, Task 1, Analysis of Required Grinding Wheel Characteristics, and Task 2, Design and Prototype Development. In Task 1 we performed a parallel path approach with Superabrasive metal-bond development and the higher technical risk, CVD diamond Wheel development. For the Superabrasive approach, Task 1 included bond wear and strength tests to engineer bond-wear characteristics. This task culminated in a small-Wheel screening test plunge grinding sialon disks. In Task 2, an improved Superabrasive metal-bond specification for low-cost machining of ceramics in external cylindrical grinding mode was identified. The experimental Wheel successfully ground three types of advanced ceramics without the need for Wheel dressing. The spindle power consumed by this Wheel during test grinding of NC-520 sialon is as much as to 30% lower compared to a standard Resin Bonded Wheel with 100 diamond concentration. The Wheel wear with this improvedmore » metal bond was an order of magnitude lower than the Resin-Bonded Wheel, which would significantly reduce ceramic grinding costs through fewer Wheel changes for retruing and replacements. Evaluation of ceramic specimens from both Tasks 1 and 2 tests for all three ceramic materials did not show evidence of unusual grinding damage. The novel CVD-diamond-Wheel approach was incorporated in this program as part of Task 1. The important factors affecting the grinding performance of diamond Wheels made by CVD coating preforms were determined.« less