Fabrication of free-form surfaces using a long-stroke fast tool servo and corrective figuring with on-machine measurement

Kim, Ho-Sang; Lee, Kwang; Lee, Kyoung-Min; Bang, Young-bong

doi:10.1016/j.ijmachtools.2009.06.011

Cited by 91 publications

(35 citation statements)

References 7 publications

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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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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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“…Fast-tool-servo-(FTS-) based single-point diamond turning (SPDT) is considered a very promising technology for the generation of freeform surfaces and complicated micro/nano structures [1][2][3], and the piezoelectric actuator (PEA) has been widely employed as the driving source of the FTS for its various superior advantages, such as high stiffness, high-frequency response, high resolution, and miniature size [1][2][3][4]. However, due to the intrinsic friction among the material crystals of the PEA, there always exists nonlinear hysteresis effects when electric voltages are applied to drive the PEA [4,5].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Compensation for Hysteresis Nonlinearity of a Piezoelectrically Actuated Fast Tool Servo Based on a Novel Linear Model

Zhu

Zhou

Lin

et al. 2012

ISRN Mechanical Engineering

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In order to describe and compensate for complex hysteresis nonlinearities of piezoelectrically actuated fast tool servo (FTS), a novel Linear Fractional order Differentiation Hysteresis (LFDH) model is proposed in this paper. By means of the proposed LFDH model which is established on the fractional calculus theory, an analytical description of hysteresis behaviors of the FTS is derived. Furthermore, the LFDH model-based inverse compensation strategy is proposed to suppress the hysteresis effects of the FTS. Finally, a series of experiments are conducted to verify the effectiveness of the LFDH model and the corresponding compensation approach. The results demonstrate that the proposed LFDH model is efficient for describing hysteresis behaviors and the inverse compensation strategy can significantly suppress the inherent hysteresis of the FTS in open-loop operations.

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“…But they seldom considered the actual application in precision engineering (PE). On the contrary some FTSs have been designed taking little account of the design principles of CMs (Cuttino et al, 1999;Gan et al, 2007;Huo and Cheng, 2008;Kim and Kim, 2003;Kim et al, 2004Kim et al, , 2009Kouno, 1984;Noh et al, 2009;Spotts et al, 2004;Tian et al, 2009). Therefore, there is a need for a comprehensive and robust design method combining with CMs and PE to meet the stringent requirements of ultra precision machining.…”

Section: Introductionmentioning

confidence: 99%

“…Cuttino (1999) used two annular flexures in his FTS but the design bandwidth is only 100 Hz. The CM Correspondence to: K. Cheng (kai.cheng@brunel.ac.uk) with two sets of parallel circle notch flexure hinges was introduced by Gan et al (2007), Huo and Cheng (2008), Kim and Kim (2003), Kim et al (2004Kim et al ( , 2009, Tian et al (2009). Kim and Kim (2003) and Kim et al (2004) designed a FTS giving a stroke and natural frequency of 7.5 µm and 100 Hz respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Kim and Kim (2003) and Kim et al (2004) designed a FTS giving a stroke and natural frequency of 7.5 µm and 100 Hz respectively. In order to increase the stroke of the FTS, a flexure mechanism amplifier was embedded on the CM and the stroke was increased to 432 µm but the stiffness decreased (Kim et al, 2009). Gan et al (2007) pointed out that the dimensions of a CM were determined by the static stiffness along three directions and the stiffness of the CM of his FTS along the motion direction was 4.29 N µm −1 ; the mass of the rigid part, the stroke and the natural frequency were 170 g, 4.6 µm and 69 Hz respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and principles of an innovative compliant fast tool servo for precision engineering

Ibrahim

Cheng

2011

Mech. Sci.

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Abstract. The paper presents an innovative design of fast tool servo (FTS) by combining compliant mechanism (CM) and precision engineering (PE) so as to meet the stringent requirements of a one degree of freedom (1DOF) compact FTS. The design requirements of the FTS include: (a) 1 nm resolution, (b) 10-20 µm of range, (c) first natural frequency of over 1400 Hz, (d) compatibility with holding different diamond cutting tools, and (e) without fatigue of the compliant mechanism. Then FEA is used to evaluate the static and dynamic performance of the FTS. The preliminary results show that both the static and dynamic performances are matched to the design objectives.

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Fabrication of free-form surfaces using a long-stroke fast tool servo and corrective figuring with on-machine measurement

Cited by 91 publications

References 7 publications

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

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

Modeling and Compensation for Hysteresis Nonlinearity of a Piezoelectrically Actuated Fast Tool Servo Based on a Novel Linear Model

Design and principles of an innovative compliant fast tool servo for precision engineering

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