Servo piezo tool SPT400MML for the fast and precise machining of free forms

Sosnicki, Olivier; Pages, Alexandre; Pacheco, Carinne; Maillard, T.

doi:10.1007/s00170-009-2140-6

Cited by 25 publications

(8 citation statements)

References 1 publication

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“…Substituting the three-point boundary conditions (14), the coefficient matrix of the linear system becomes sparse and symmetric, and then the solution can be carried out efficiently. Therefore, the values of grid points on the addition surface v(x, y) can be calculated, and then by summing these values with the values of points on the background surface, the values of discrete points on the PAL surface can be obtained.…”

Section: The Variational-difference Algorithmmentioning

confidence: 99%

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Study on the variational-difference-based design and slow tool servo turning of progressive addition lenses

Kang

Yang

Wang

et al. 2018

Advances in Mechanical Engineering

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Nowadays, progressive addition lenses are widely applied to correct people's vision disorders, but the design and machining of progressive addition lenses are still difficult. Generally, a progressive addition lens has a freeform front surface and a spherical back surface. In this article, the design of the front surface was simplified as a minimization problem of a functional, and the solution was obtained directly using a variational-difference method. After solving this problem, the description of the surface was discussed, and an evaluation method was proposed to analyze the fitting accuracy of Zernike polynomial method and B-spline interpolation method with different degrees. As a result, the progressive addition lens surface was constructed by the method with smaller fitting error. Moreover, a new generation algorithm of entrance parameters for tool path generation was put forward, which can reduce the interpolation error. The experimental results indicate that the design method was feasible and the machined surface quality was satisfactory using the proposed algorithm.

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Section: The Variational-difference Algorithmmentioning

confidence: 99%

“…For the moment, many technologies including micro-milling, 12 fly-cutting or raster milling, 13 fast tool servo, 14 and slow tool servo (STS) 15 are used for the machining of complex surfaces. Compared with other technologies, the advantages of STS are good surface quality and high processing efficiency.…”

Section: Introductionmentioning

confidence: 99%

Study on the variational-difference-based design and slow tool servo turning of progressive addition lenses

Kang

Yang

Wang

et al. 2018

Advances in Mechanical Engineering

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“…But the piston pattern is usually only given some discrete point data of the longitudinal and standard horizontal type lines. To process the high-precision piston, these discrete data points are not enough [3]. Therefore, we first deal with the discrete point data fitting interpolation processing to get enough data processing.…”

Section: Introductionmentioning

confidence: 99%

Research on the Dynamic Simulation System in High Speed Machining of the Middle-Convex and Varying Ellipse Piston

Xiang-chen

Guo

2015

2015 8th International Symposium on Computational Intelligence and Design (ISCID)

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Through in-depth analysis of the fitting interpolation principle combining with characteristics of piston surface structure, the mathematical model of the type line fitting interpolation is established, which is applicable to vertical line and line of the different cross section shape. In order to improve the machining efficiency and precision, using modular design method and basing on the RAD Studio 2010, the dynamic simulation system of high speed machining of the middle-convex and varying ellipse piston is developed. The system can realize different structure piston dynamic simulation of the high speed machining process and generate the corresponding P code processing instructions by fitting interpolation model embedded in the system. Finally, the reliability of the system is verified by some examples. The experimental results show that the system is stable and reliable, with friendly interface and stronger versatility. It can effectively improve the accuracy and efficiency of various middle-convex and varying ellipse piston numerical control high speed machining.

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“…Toric and progressive addition lenses (PAL) are a kind of opthalmic lenses with freeform surface, and their application is limited for a long time by the difficulty to design and manufacture. At present, freeform surfaces can be machined by fast tool servo [1][2][3][4], micro-milling [5][6][7], fly-cutting or raster milling [8,9], and slow tool servo (STS) [10][11][12][13][14] etc. Among these technologies, with the advantages of high surface accuracy and high machining efficiency, STS is gradually applied to machine freeform surface.…”

Section: Introductionmentioning

confidence: 99%

Predictive modeling of surface roughness in lenses precision turning using regression and support vector machines

Wang

Kang

et al. 2013

Int J Adv Manuf Technol

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Slow tool servo (STS) turning is superior in machining precision and in complicated surface. However, STS turning is a complex process in which many variables can affect the desired results. This paper focuses on surface roughness prediction in lenses STS turning. An exponential model, based on the five main cutting parameters including tool nose radius, feed rate, depth of cut, C-axis speed, and discretization angle, for surface roughness prediction of lenses is developed by means of orthogonal experiment regression analysis. Meanwhile, a prediction model of surface roughness based on least squares support vector machines (LS-SVM) with radial basis function is constructed. Orthogonal experiment swatches are studied, and chaotic particle swarm optimization and leaveone-out cross-validation are applied to determine the model parameters. The comparison of LS-SVM model and exponential model is also carried out. Predictive LS-SVM model is found to be capable of better predictions for surface roughness and has absolute fraction of variance R 2 of 0.99887, the mean absolute percent error e M of 8.96 %, and the root mean square error e R of 10.68 %. The experimental results and prediction of LS-SVM model show that effects of tool nose radius and feed rate are more significant than that of depth of cut on surface roughness of lenses turning.

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Servo piezo tool SPT400MML for the fast and precise machining of free forms

Cited by 25 publications

References 1 publication

Study on the variational-difference-based design and slow tool servo turning of progressive addition lenses

Study on the variational-difference-based design and slow tool servo turning of progressive addition lenses

Research on the Dynamic Simulation System in High Speed Machining of the Middle-Convex and Varying Ellipse Piston

Predictive modeling of surface roughness in lenses precision turning using regression and support vector machines

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