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T. Kishinami - One of the best experts on this subject based on the ideXlab platform.

  • Inspection Method for Geometrical Tolerances using Coordinate Measuring Machine
    Computer-aided Tolerancing, 1996
    Co-Authors: Fumiki Tanaka, P. Ikonomov, Hideaki Okamoto, T. Kishinami
    Abstract:

    The method of inspecting Geometrical Tolerances is important from the economic and qualitative viewpoints in Coordinate Measuring Machine (CMM) measurement. Much work has been done on the evaluation of the Geometrical deviation of form for a single feature from a measured data set. But, on the other hand, the inspection of Geometrical deviation for related features has not been well developed. In this paper, we first discuss the following topics: l)Problems of CMM inspection based on ISO Geometrical Tolerance, 2)Formal representation of ISO Geometrical Tolerance using EXPRESS, and 3)Necessity of a virtual gauge as a criterion for deriving Geometrical deviation. Secondly, we propose a virtual gauge as a criterion for deriving the Geometrical deviation of the Toleranced feature from a measured data set. For the mathematical representation of the virtual gauge, we introduce mathematical representations of Geometrical elements and the relationship between datum and Toleranced feature. We extend the small displacement screw method in order to find out the minimum Geometrical deviation based on the virtual gauge. We also show that the proposed method is very effective by applying it to some examples.

  • inspection method for Geometrical Tolerance using virtual gauges
    International Conference on Robotics and Automation, 1995
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.

  • ICRA - Inspection method for Geometrical Tolerance using virtual gauges
    Proceedings of 1995 IEEE International Conference on Robotics and Automation, 1
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.

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

  • Inspection Method for Geometrical Tolerances using Coordinate Measuring Machine
    Computer-aided Tolerancing, 1996
    Co-Authors: Fumiki Tanaka, P. Ikonomov, Hideaki Okamoto, T. Kishinami
    Abstract:

    The method of inspecting Geometrical Tolerances is important from the economic and qualitative viewpoints in Coordinate Measuring Machine (CMM) measurement. Much work has been done on the evaluation of the Geometrical deviation of form for a single feature from a measured data set. But, on the other hand, the inspection of Geometrical deviation for related features has not been well developed. In this paper, we first discuss the following topics: l)Problems of CMM inspection based on ISO Geometrical Tolerance, 2)Formal representation of ISO Geometrical Tolerance using EXPRESS, and 3)Necessity of a virtual gauge as a criterion for deriving Geometrical deviation. Secondly, we propose a virtual gauge as a criterion for deriving the Geometrical deviation of the Toleranced feature from a measured data set. For the mathematical representation of the virtual gauge, we introduce mathematical representations of Geometrical elements and the relationship between datum and Toleranced feature. We extend the small displacement screw method in order to find out the minimum Geometrical deviation based on the virtual gauge. We also show that the proposed method is very effective by applying it to some examples.

  • inspection method for Geometrical Tolerance using virtual gauges
    International Conference on Robotics and Automation, 1995
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.

  • ICRA - Inspection method for Geometrical Tolerance using virtual gauges
    Proceedings of 1995 IEEE International Conference on Robotics and Automation, 1
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.

M. M. Sfantsikopoulos - One of the best experts on this subject based on the ideXlab platform.

  • process capability requirement under maximum material condition
    Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2006
    Co-Authors: S. C. Diplaris, M. M. Sfantsikopoulos
    Abstract:

    A frequently used Geometrical Tolerance is the position Tolerance. When it is assigned at the maximum material condition (MMC), an increase in the position Tolerance is allowed, equal to the departure of the particular feature from the maximum material condition size. Neither concept - position Tolerance and maximum material condition - analytically related with the exact coordinate dimensions that locate the feature. A feature position is usually allocated on the basis of its theoretically exact co-ordinate dimensions, whereas positional accuracy is pursued through an appropriate planning of the machining process in conjunction with appropriate machine tool(s) and/or jig(s). Exploitation of the MMC Tolerance bonus is taken into account mainly during part inspection in order to reduce rejects. Such an approach is not systematic, considering that the MMC benefits are not taken directly into account in the process planning stage in order to control the overall process cost. In this paper, the permitted manufacturing errors of a feature size and position are considered and studied simultaneously in an analytical way. It is shown that a lower process capability (PC) requirement can then be established that leads to a significant process cost reduction. An application example demonstrates the use of the method and the obtained results are discussed.

  • Maximum material condition in process planning
    Production Planning & Control, 2006
    Co-Authors: S. C. Diplaris, M. M. Sfantsikopoulos
    Abstract:

    Appropriate and cost effective assignment and interpretation of dimensional and Geometrical Tolerances, in conjunction with tolerancing principles such as the maximum material condition (MMC), constitute a major area of concern for manufacturing SMEs. This is particularly true for the process planning stage, where production operations and parameter values establish the final product quality and cost. A frequently used Geometrical Tolerance is the position Tolerance. It allows at least 57% more space for feature allocation without affecting product quality and is very useful for accurate specification of multiple-hole assemblies. Feature allocation becomes further relaxed in case a position Tolerance is assigned to the MMC. This assignment is mainly exploited during inspection, because it permits fewer rejections. In terms of cost, it is advantageous to systematically integrate the MMC Tolerance bonus into the position Tolerance at the process planning stage. A methodology that allows a new MMC-adapted po...

  • An accuracy analysis of the peg-and-hole assembly problem
    International Journal of Machine Tools and Manufacture, 1994
    Co-Authors: M. M. Sfantsikopoulos, S. C. Diplaris, P. N. Papazoglou
    Abstract:

    Abstract A peg-and-hole assembly may adopt clearance, transition or interference fits depending on the functional requirements of the particular design. The international standards that are used for the specification of the nature of a fit refer, nevertheless, only to dimensional deviations. They do not consider the actual geometry of the assembly components. Geometrical Tolerances are assigned in addition to the dimensional Tolerances whereas, for certain applications, the latter may also include some provision for them. Maximum and minimum functional clearances, dimensional and Geometrical Tolerances of a peg-and-hole assembly consist of a system where values of the first two variables are design-imposed and the dimensional/Geometrical Tolerance values have to be suitably allocated. This Tolerance allocation cannot, however, be effected by a straightforward approach. The unknown variables are more than the available clearance/Tolerance relationships and in the current engineering practice, the problem solution is usually based on experimental/empirical data and/or general Tolerance assignment guidelines. The paper addresses this problem through a systematic analysis of the accuracy requirements of a peg-and-hole clearance fit assembly. The analysis is then followed by the development of a methodology for the evaluation of the dimensional and Geometrical Tolerances of the assembly components. The presented algorithm is further applied and discussed in a case study.

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

  • A Representation Model of Geometrical Tolerances Based on First Order Logic
    2012
    Co-Authors: Yuchu Qin, Yanru Zhong, Liang Chang, Meifa Huang
    Abstract:

    Tolerance representation models are used to specify Tolerance types and explain semantics of Tolerances for nominal geometry parts. To well explain semantics of Geometrical Tolerances, a representation model of Geometrical Tolerances based on First Order Logic (FOL) is presented in this paper. We first investigate the classifications of feature variations and give the FOL representations of them based on these classifications. Next, based on the above representations, we present a FOL representation model of Geometrical Tolerances. Furthermore, we demonstrate the effectiveness of the representation model by specifying Geometrical Tolerance types in an example.

  • Intelligent Information Processing - A Representation Model of Geometrical Tolerances Based on First Order Logic
    Intelligent Information Processing VI, 2012
    Co-Authors: Yuchu Qin, Yanru Zhong, Liang Chang, Meifa Huang
    Abstract:

    Tolerance representation models are used to specify Tolerance types and explain semantics of Tolerances for nominal geometry parts. To well explain semantics of Geometrical Tolerances, a representation model of Geometrical Tolerances based on First Order Logic (FOL) is presented in this paper. We first investigate the classifications of feature variations and give the FOL representations of them based on these classifications. Next, based on the above representations, we present a FOL representation model of Geometrical Tolerances. Furthermore, we demonstrate the effectiveness of the representation model by specifying Geometrical Tolerance types in an example.

  • dimensional and Geometrical Tolerance balancing in concurrent design
    The International Journal of Advanced Manufacturing Technology, 2008
    Co-Authors: Meifa Huang, Yanru Zhong
    Abstract:

    In conventional design, tolerancing is divided into two separated sequential stages, i.e., product tolerancing and process tolerancing. In product tolerancing stage, the assembly functional Tolerances are allocated to BP component Tolerances. In the process tolerancing stage, the obtained BP Tolerances are further allocated to the process Tolerances in terms of the given process planning. As a result, Tolerance design often results in conflict and redesign. An optimal design methodology for both dimensional and Geometrical Tolerances (DGTs) is presented and validated in a concurrent design environment. We directly allocate the required functional assembly DGTs to the pertinent process DGTs by using the given process planning of the related components. Geometrical Tolerances are treated as the equivalent bilateral dimensional Tolerances or the additional Tolerance constraints according to their functional roles and engineering semantics in manufacturing. When the process sequences of the related components have been determined in the assembly structure design stage, we formulate the concurrent Tolerance chains to express the relations between the assembly DGTs and the related component process DGTs by using the integrated Tolerance charts. Concurrent tolerancing which simultaneously optimizes the process Tolerance based on the constraints of concurrent DGTs and the process accuracy is implemented by a linear programming approach. In the optimization model the objective is to maximize the total weight process DGTs while weight factor is used to evaluate the different manufacturing costs between different means of manufacturing operations corresponding to the same Tolerance value. Economical Tolerance bounds of related operations are given as constraints. Finally, an example is included to demonstrate the proposed methodology.

  • Concurrent Dimensional and Geometrical Tolerance Balancing
    2006 6th World Congress on Intelligent Control and Automation, 2006
    Co-Authors: Meifa Huang, Yanru Zhong
    Abstract:

    An optimal design method for dimensional and Geometrical Tolerances (DGTs) has been presented and validated. In concurrent design environment, this method can directly allocate required functional assembly DGTs into pertinent process DGTs by using the given process planning of related components. The Geometrical Tolerances are treated as equivalent bilateral dimensional Tolerances or additional Tolerance constraints according to their different functional roles and engineering semantics in manufacturing. After the process sequences of related workpieces have been determined, concurrent Tolerance chins, which express the relations between assembly DGTs and related component DGTs, are formulated by application of integrated Tolerance charts. Concurrent tolerancing has been implemented through a linear programming approach, which simultaneously optimizes process Tolerance based on process accuracy constraints. In optimization model, the objective is to maximize total weight process DGTs. Weight factor is used to evaluate the different manufacturing costs between different means of manufacturing corresponding to the same Tolerance value. Economical Tolerance bounds of related operations are formulated as constraints. Finally, an example is included to demonstrate the proposed method

Fumiki Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • Inspection Method for Geometrical Tolerances using Coordinate Measuring Machine
    Computer-aided Tolerancing, 1996
    Co-Authors: Fumiki Tanaka, P. Ikonomov, Hideaki Okamoto, T. Kishinami
    Abstract:

    The method of inspecting Geometrical Tolerances is important from the economic and qualitative viewpoints in Coordinate Measuring Machine (CMM) measurement. Much work has been done on the evaluation of the Geometrical deviation of form for a single feature from a measured data set. But, on the other hand, the inspection of Geometrical deviation for related features has not been well developed. In this paper, we first discuss the following topics: l)Problems of CMM inspection based on ISO Geometrical Tolerance, 2)Formal representation of ISO Geometrical Tolerance using EXPRESS, and 3)Necessity of a virtual gauge as a criterion for deriving Geometrical deviation. Secondly, we propose a virtual gauge as a criterion for deriving the Geometrical deviation of the Toleranced feature from a measured data set. For the mathematical representation of the virtual gauge, we introduce mathematical representations of Geometrical elements and the relationship between datum and Toleranced feature. We extend the small displacement screw method in order to find out the minimum Geometrical deviation based on the virtual gauge. We also show that the proposed method is very effective by applying it to some examples.

  • inspection method for Geometrical Tolerance using virtual gauges
    International Conference on Robotics and Automation, 1995
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.

  • ICRA - Inspection method for Geometrical Tolerance using virtual gauges
    Proceedings of 1995 IEEE International Conference on Robotics and Automation, 1
    Co-Authors: P. Ikonomov, Fumiki Tanaka, Hideaki Okamoto, T. Kishinami
    Abstract:

    In this paper we propose an inspection method for Geometrical Tolerances using virtual gauges for measurement with coordinate measuring machine (CMM). For evaluation of the Geometrical Tolerance virtual measuring gauge as computerized replacement for the real gauge is introduced. The evaluation model for calculation of the virtual gauge uses Geometrical constraint for representation of implicit relationships between feature and datums. The implementation evaluation method is small displacement screw method with optimization procedure min-max. Application examples and an extension of small displacement screw method to handle the constraint is provided. We resolve the difficulties for Geometrical Tolerance inspection, by providing an explicit representation of relationships between features and datums that can be used in an inspection system. Proposed computerized Tolerance inspection closely resembles the real gauge measurements and is in concordance with ISO Tolerance system.