| The improved GPS system is an information system of standard and metrology,which adapts to the economic globalization and faces the digital designing, manu-facturing and measuring. The uncertainty theory is an important component of theimproved GPS system. The new GPS integrates product specification, manufacturingand verification by the transitive relations of uncertainty. The surface roughness is theimportant parameters to judge the surface quality of parts. The verification of surfaceroughness is reasonable or not will a?ect mis-acceptance and mis-rejection of parts.Based on the new GPS system and uncertainty theory, the paper researches the inte-gration of product specification, manufacturing and verification. The main researchesand creative points are as follows:Firstly, the paper improves the algorithms on marking the surface roughness,based on the specification of surface roughness in the national standard. The paperanalyzes the requirements of surface roughness symbols and methods of indicating inthe national standard GB/T131-1993. Then the algorithms are improved in reference39. It is implemented to mark the surface roughness based on ObjecrARX.Secondly, A calculation method for uncertainty of Rz and Ry is proposed to as-sure integrity of the verification result and its validity, based on the least squares. Themethod calculates the verification results by the basic principle of least squares in sur-face roughness. The uncertainty of the verification results is computed by expressionsgiven in ISO/TS 14253-2. Then, the parts could be decided to accept or reject by thedecision rules provided by ISO 14253-1.Thirdly, A calculation method for uncertainty of Ra is proposed to assure integrityof the verification result and its validity, based on the gauss filtering. The methodcalculates the verification results by the basic principle of gauss filtering of Ra in surfaceroughness. The uncertainty of the verification results is computed by the relationsbetween information entropy and uncertainty. Then, the parts could be decided toaccept or reject by the decision rules provided by ISO 14253-1. The paper comparesthe verification result and its validity calculated by the least squares with calculatedby the gauss filtering, and the gauss filtering is better than the least squares to assessthe Ra of surface roughness when the uncertainly of the verification results is given.Fourthly, an evaluation module of surface roughness is introduced, with usingMatlab and VC mixed programming. The module calculates the verification resultsand the uncertainty. Then, the parts could be decided to accept or reject by the decisionrules provided by ISO 14253-1 and the specification data in specification module.Through above four aspects research, the paper basically realizes the integrity of product specification, manufacturing and verification. It may provide the reference forevaluation of surface roughness. |
