Kinematic corner smoothing for high speed machine tools

Tajima, Shingo; Sencer, Burak

doi:10.1016/j.ijmachtools.2016.05.009

Cited by 78 publications

(43 citation statements)

References 27 publications

(22 reference statements)

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“…The inserted B-splines will overlap with each other, which makes the subsequent interpolation impossible. Tulsyan and Altintas [72] proposed [65] FANUC [77] Delta Tau [82] Tajima et al, 2018 [85] to restrict the length of the transition path to avoid the overlap problem, i.e., the maximum length of P 0 P 2 and P 2 P 4 are restricted to the minimum half-length of the connecting segments, as shown in Fig. 10 (b).…”

Section: Local Curve Corner Roundingmentioning

confidence: 99%

“…However, it also has the same limitation as the local curve corner rounding method. The Delta Tau Power PMAC controller [82] achieves the fixed-error corner blending by calculating the blending time based on the move speeds and change in angle at the corner. The blending starts and ends at the blending-time-dependent distance from the corner.…”

Section: Local Velocity Blendingmentioning

confidence: 99%

See 1 more Smart Citation

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Zhong

Luo

Chang

et al. 2019

Int. J. Autom. Comput.

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Driven by the ever increasing demand in function integration, more and more next generation high value-added products, such as head-up displays, solar concentrators and intra-ocular-lens, etc., are designed to possess freeform (i.e., non-rotational symmetric) surfaces. The toolpath, composed of high density of short linear and circular segments, is generally used in computer numerical control (CNC) systems to machine those products. However, the discontinuity between toolpath segments leads to high-frequency fluctuation of feedrate and acceleration, which will decrease the machining efficiency and product surface finish. Driven by the ever-increasing need for high-speed high-precision machining of those products, many novel toolpath interpolation and smoothing approaches have been proposed in both academia and industry, aiming to alleviate the issues caused by the conventional toolpath representation and interpolation methods. This paper provides a comprehensive review of the state-of-the-art toolpath interpolation and smoothing approaches with systematic classifications. The advantages and disadvantages of these approaches are discussed. Possible future research directions are also offered.

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Section: Local Curve Corner Roundingmentioning

confidence: 99%

Section: Local Velocity Blendingmentioning

confidence: 99%

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Zhong

Luo

Chang

et al. 2019

Int. J. Autom. Comput.

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show abstract

“…There are some algorithms developed to smooth the tool path and improve the surface quality, such those proposed by Sun et al [24], Tajima et al [25] and Beudaert et al [26]. Usually, these algorithms work using the previously calculated NC code.…”

Section: Machine/cnc To Perform Free-form Tool Pathsmentioning

confidence: 99%

Study of tool paths calculated by different commercial CAM systems and influences on the real machining time and surface roughness for milling free-form geometries

Souza

Käsemodel

Arias³

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Today, there are many commercial CAM systems available capable of generating NC codes for milling free-form geometries up to 5-axis. However, the quality of these NC codes has not yet been well discussed so far. Apparently, on the computer screen and the geometrical simulation provided by CAM, tool paths calculated by different CAM systems seem to be the same. However, as observed in this work, NC codes differ expressively according to the CAM software applied, and it affects the productivity and quality of the machined surface. Thus, a study was carried out to investigate this issue. A representative workpiece with free-form geometries was designed; a data acquisition system from an open architecture CNC was developed and NC codes were generated by five worldwide commercial CAM systems. The finishing milling operation was evaluated. The results presented difference of up to 30% on the real machining time, differences in the feed rate oscillation and up to 2 times the surface roughness value. This work reveals an essential limitation on the CAM algorithm and arises a new point for benchmarking CAM systems, which brings an opportunity to improve the calculation of tool paths for milling free-form geometries.

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“…Shi et al [1] proposed a velocity link algorithm to realize a smooth sharp-corner transition with such constraints as the corner angle, acceleration capacity, and maximum velocity limitation. Zhang et al [2] and Tajima et al [3] introduced the acceleration and contour error constraints to derive the velocity-blending control equations that had such parameters as motion time and transition velocity. Lee [4], Luo et al [5], Wang [6] and Li et al [7] adopted velocity look-ahead control strategies in kinematic planning for short linear segments to achieve maximum machining efficiency.…”

Section: Introductionmentioning

confidence: 99%

Corner Transition Toolpath Generation Based on Velocity-Blending Algorithm for Glass Edge Grinding

Ren

Pan

Jiang

et al. 2019

Chin. J. Mech. Eng.

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Sharp corners usually are used on glass contours to meet the highly increasing demand for personalized products, but they result in a broken wheel center toolpath in edge grinding. To ensure that the whole wheel center toolpath is of G1 continuity and that the grinding depth is controllable at the corners, a transition toolpath generation method based on a velocity-blending algorithm is proposed. Taking the grinding depth into consideration, the sharp-corner grinding process is planned, and a velocity-blending algorithm is introduced. With the constraints, such as traverse displacement and grinding depth, the sharp-corner transition toolpath is generated with a three-phase motion arrangement and with confirmations of the acceleration/deceleration positions. A piece of glass with three sharp corners is ground on a three-axis numerical-control glass grinding equipment. The experimental results demonstrate that the proposed algorithm can protect the sharp corners from breakage efficiently and achieve satisfactory shape accuracy. This research proposed a toolpath generation method based on a velocity-blending algorithm for the manufacturing of personalized glass products, which generates the transition toolpath as needed around a sharp corner in real time.

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Kinematic corner smoothing for high speed machine tools

Cited by 78 publications

References 27 publications

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Study of tool paths calculated by different commercial CAM systems and influences on the real machining time and surface roughness for milling free-form geometries

Corner Transition Toolpath Generation Based on Velocity-Blending Algorithm for Glass Edge Grinding

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