An Approach Based on Process Signature Modeling for Roundness Evaluation of Manufactured Items

In evaluating the geometrical characteristics of mechanical part, cleverness may be added with the definition of an empirical model representing the "signature" left by the manufacturing process used to make the part. This manufacturing signature is the systematic pattern that characterizes all the features machined with that process. If such a model is available, it may be exploited to enhance geometrical inspection accuracy. In this paper, an approach for geometrical inspection of machined profiles is proposed. This approach consists in computing form deviations by reconstructing the actual profile using a frequency model of process signature. The method has been thoroughly investigated in different simulated scenarios and benefits in terms of improved accuracy are demonstrated. Within the paper, a case study, related to roundness of mechanical parts obtained by turning, is used. The relationships between the number of sampled points and fitting algorithms are also pointed out.

[1]  Gwilym M. Jenkins,et al.  Time series analysis, forecasting and control , 1971 .

[2]  Sencer Yeralan,et al.  Computerized roundness inspection , 1988 .

[3]  H. Chang,et al.  Evaluation of circularity tolerance using Monte Carlo simulation for coordinate measuring machine , 1993 .

[4]  H. Weber,et al.  Functionality-oriented evaluation and sampling strategy in coordinate metrology , 1995 .

[5]  Placid Mathew Ferreira,et al.  Verification of form tolerances part I: Basic issues, flatness, and straightness , 1995 .

[6]  Kirsten Marie Carr,et al.  Verification of form tolerances part II: Cylindricity and straightness of a median line , 1995 .

[7]  Quirico Semeraro,et al.  The effect of sampling in circular substitute geometries evaluation , 1999 .

[8]  K. D. Summerhays,et al.  Methods for evaluation of systematic geometric deviations in machined parts and their relationships to process variables , 1999 .

[9]  Quirico Semeraro,et al.  The harmonic fitting method for the assessment of the substitute geometry estimate error. Part I : 2D and 3D theory , 2001 .

[10]  Quirico Semeraro,et al.  The harmonic fitting method for the assessment of the substitute geometry estimate error. Part II: statistical approach, machining process analysis and inspection plan optimisation , 2001 .

[11]  Jay F. Tu,et al.  Roundness modeling of machined parts for tolerance analysis , 2001 .

[12]  Tai-Hung Yang,et al.  A Shannon sampling approach to form error estimation , 2002 .

[13]  J. M. Baldwin,et al.  Optimizing discrete point sample patterns and measurement data analysis on internal cylindrical surfaces with systematic form deviations , 2002 .

[14]  Jay F. Tu,et al.  Quantitative circularity tolerance analysis and design for 2D precision assemblies , 2002 .

[15]  Trichy M. Kethara Pasupathy,et al.  A Survey of Mathematical Methods for the Construction of Geometric Tolerance Zones , 2003, J. Comput. Inf. Sci. Eng..

[16]  Quirico Semeraro,et al.  Manufacturing signature of turned circular profiles , 2004 .

[17]  B. M. Colosimo,et al.  On the identification of manufacturing processes' signature , 2005 .

[18]  M. S. Shunmugam,et al.  Fitting of Reference Surfaces for Engineering Surfaces by Nonlinear Least-Squares Technique , 2006, J. Comput. Inf. Sci. Eng..

[19]  Vijay Srinivasan Computational Metrology for the Design and Manufacture of Product Geometry: A Classification and Synthesis , 2007, J. Comput. Inf. Sci. Eng..

[20]  Massimo Pacella,et al.  Statistical Process Control for Geometric Specifications: On the Monitoring of Roundness Profiles , 2008 .