Accurate interpolation of machining tool-paths based on FIR filtering

Tajima, Shingo; Sencer, Burak; Shamoto, Eiji

doi:10.1016/j.precisioneng.2018.01.016

Cited by 63 publications

(25 citation statements)

References 23 publications

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“…The actual blending length will be very limited if the original linear segments are short, thus the feedrate must slow down to avoid saturating the drives. Sencer et al [84] developed a method using finite impulse response (FIR) to filter the discontinuous axes velocities at the corner to achieve a smooth transition. The tolerance was controlled by selecting the overlapping time.…”

Section: Local Velocity Blendingmentioning

confidence: 99%

“…Aerotech [66] SIEMENS [65] Tajima et al, 2016 [83] Tajima and Sencer, 2016 [86] Huang et al, 2017 [67] Yang et al, 2015 [78] Sencer et al, 2015 [84] Yang and Yuen, 2017 [68] Fan et al, 2015 [79] Sun et al, 2016 [69] Wang et al, 2014 [80] Shi et al, 2015 [70] Yuen et al, 2013 [81] Bi et al, 2015 [71] Tulsyan and Altintas, 2015 [72] Sencer et al, 2014 [73] Zhao et al, 2013 [74] Beudaert et al, 2013 [75] Pateloup et al, 2010 [76] W.…”

mentioning

confidence: 99%

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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 Velocity Blendingmentioning

confidence: 99%

mentioning

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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“…There are also methods based on filtering where the discrete toolpath is blended based on low-pass filtering. Finite impulse response (FIR) filters are used for such purpose [18]. Such filtering-based techniques are more computationally efficient and greatly favoured for real-time interpolation on NC systems.…”

Section: Introductionmentioning

confidence: 99%

Accurate prediction of machining feedrate and cycle times considering interpolator dynamics

Ward

Sencer

Jones

et al. 2021

Int J Adv Manuf Technol

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This paper presents an accurate machining feedrate prediction technique by modelling the trajectory generation behaviour of modern CNC machine tools. Typically, CAM systems simulate machines’ motion based on the commanded feedrate and the path geometry. Such approach does not consider the feed planning and interpolation strategy of the machine’s numerical control (NC) system. In this study, trajectory generation behaviour of the NC system is modelled and accurate cycle time prediction for complex machining toolpaths is realised. NC system’s linear interpolation dynamics and commanded axis kinematic profiles are predicted by using finite impulse response (FIR)–based low-pass filters. The corner blending behaviour during non-stop interpolation of linear segments is modelled, and for the first time, the minimum cornering feedrate that satisfies both the tolerance and machining constraints has been calculated analytically for 3-axis toolpaths of any geometry. The proposed method is applied to 4 different case studies including complex machining toolpaths. Experimental validations show actual cycle times can be estimated with > 90% accuracy, greatly outperforming CAM-based predictions. It is expected that the proposed approach will help improve the accuracy of virtual machining models and support businesses’ decision-making when costing machining processes.

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“…These include acceleration feedback (Kai et al, 2018), designing feed rate and acceleration/deceleration profiles (Erkorkmaz and Altintas, 2001; Altintas and Erkorkmaz, 2003), and designing an input command filter that can avoid exciting the resonances (Chen and Lee, 1998). Attempts have been made to apply filtering approaches to the contouring motions (Altintas and Khoshdarregi, 2012;Sencer et al, 2015, andTajima et al, 2018). A frequency separation approach and tool position estimation method using a Kalman filter have also been suggested (Denkena et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Active vibration suppression of NC machine tools for high-speed contouring motions

Sato

Hayashi

Shirase

2020

JAMDSM

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In this study, we describe a novel mechanical vibration suppression method for high-speed contouring motions. In this method, vibration compensation torque was applied to suppress mechanical vibrations during high-speed contouring motions. The parameters of the compensation signal were determined using commanded acceleration and time for acceleration and deceleration, which were set as numerical control (NC) parameters. We also propose an autonomous compensation-torque-generation algorithm based on the acceleration command from NC. The effectiveness of this method was assessed by measuring and simulating rectangular corner contouring motions in which the compensation torque is applied. The results confirmed that the proposed method can effectively suppress the vibration when the motion direction changes. This method can also be effectively performed at various feed speeds by automatically adapting the torque based on the proposed criteria.

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Accurate interpolation of machining tool-paths based on FIR filtering

Cited by 63 publications

References 23 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

Accurate prediction of machining feedrate and cycle times considering interpolator dynamics

Active vibration suppression of NC machine tools for high-speed contouring motions

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