通过关键词查论文: Geometrical Product Specification (GPS)

文章题目页数

作者: Jin Xing Wang, Xiang Qian Jiang, Pan Wang
摘要: The improved GPS (Geometrical Product Specification) system uses uncertainty as an economic tool to enable optimum allocation of resource amongst specification, manufacturing and verification. For a given GPS standard-chain, the key question is to calculate the compliance uncertainty. The determination of compliance uncertainty is a complex question because specification uncertainty and measurement uncertainty arise from many causes and propagate through the GPS standard-chain. A calculation method for compliance uncertainty of GPS standard-chain is proposed in this article. According to ISO 17450–2, a GPS process should be either in default state or special state. The biggest difference between the two states is that whether the specification operator is accordant with the verification operator. Aiming at the two states, the flow for the computation of compliance uncertainty is given respectively, and a case study is applied in default state. Results show it enables to generate compliance uncertainty on the verification of a GPS standard-chain, which makes the acceptance or refusal of GPS characteristic can be conducted in a quantitative way, so the veracity of verification could be improved.
1642
作者: Ya Zhang, Chun Yang Jia
摘要: Next generation of Geometrical Product Specifications (GPS) is the foundation of the technology standards and metrology specifications of mechanical and electric products. GPS estimation of measurement uncertainty can improve the reliability of the verification result. In the indirect measurement, the transfer characteristic is very complex. So, it is very difficult to estimate the uncertainty in the indirect measurements according to the transfer formula given by GUM. For the indirect measuring of an inside cone angle, the mathematical relation between the measurand and measurement results is established firstly. Then Monte Carlo method was adopted to conduct the sampling and synthesis of measurement uncertainty contributors. At last, the measurement method was evaluated and improved according to Procedure for Uncertainty Management. Experimental result shows that Monte Carlo Simulation method has a good application foreground in the uncertainty estimation and measurement program design.
253
作者: Bing Kuang, Xiong Cheng, Mei Fa Huang, Yong Hou Sun, Yu Xuan Wang
摘要: In the new geometrical product specification (GPS), the specification surface model is a new concept in the new-generation geometrical product specification, which is the bridge to connect between nominal model and real model. To solve the problem for generate specification surface model of flatness, a generation method for generate specification surface model of flatness is presented in this paper. Based on the composing of real surface, specification surface model of flatness is classified to three factors: function requirement factor, manufacture process factor, and roughness factor. Aimed at the different characteristic of each factor, generation model for function requirement factor, manufacture process factor, and roughness factor are built respectively. Finally, a plate part is applied to illustrate the proposed generation method for specification surface model of flatness.
3823
作者: Mariusz Deja, Mieczyslaw Siemiatkowski
摘要: The focus of this paper is on CAPP for parts manufacture in systems of definite process capabilities, involving the use of multi-axis machining centers for parts shaping and grinding machines for finishing. It presents in particular a decision making scheme for setup determination as a part of generative process planning. The planning procedure consists of two stages. The first stage is associated with generic setup determination applying tool accessibility analysis to machined features and reasoning based on geometrical product specification (GPS). The second stage involves machine specific setup planning considering the availability and capability of machines on a shop floor through setup merging. The impact of dimensional and geometric tolerance as well as the surface roughness of relatively complex mechanical element on the generated process plan with several setups was presented. The relevant reasoning mechanism within a decision making scheme on generated process alternatives is shown based on a numeric case.
159
作者: Pavlina Toteva, Nadezhda Mihaylova, Dimka Vassileva
摘要: The essential tool for improving product quality and reducing the manufacturing costs is the implementation of standards, relating to a product. Main group of ISO standards are standards related to Geometrical Product Specifications (GPS), where the requirements for geometrical characteristics of details that determine the execution of the functional purpose of the products are given. The purpose of this paper is to present the new standards of geometrical tolerancing of linear sizes, accuracy of form, orientation and position of surfaces and axes. In the paper are indicated problems associated with the implementation of that standards in Bulgaria and the ways to rectify them are given.
1001
作者: Jia Ding Bao, Rui Zhao, Yong Hou Sun, Fu Yun Liu, Mei Fa Huang
摘要: Based on coordinate measuring machine (CMM) the given part is measured in any orientation, and then the least square evaluation mathematical model of plane orientation tolerance is established. What’s more, the uncertainty evaluation method of orientation error is proposed according to the uncertainty theory of new geometrical product specification (GPS). The face-to-face angularity is taken as the example to present the effectiveness of the proposed uncertainty evaluation method. The result shows that the uncertainty evaluation method not only meets the requirements of new GPS standard, but also ensures the integrity of the flatness inspection results. As a result, the accuracy of the workpiece inspection can be improved.
932
作者: Hai Qing Du, Ya Zhang
摘要: Improved Geometrical Product Specifications (GPS) is an internationally accepted standards system. It is the foundation of the technology standards and metrology specifications. Uncertainty is one of the most important concepts in improved GPS. In the improved GPS standards system, uncertainty is used as an economic tool to enable optimum allocation of resources amongst specification, manufacturing and verification. Estimation of uncertainty in measurement according to improved GPS can improve the reliability of the measurement. A method to estimate the uncertainty in straightness measurement is proposed according to the requirements of improved GPS standard system. Based on the mini-zone method and the transparent box model, the calculation equation of uncertainty in straightness measurement is deduced. The experiment indicates that this method may assure the integrity of the verification result and improve the reliability of measurement.
2063
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