A review of contouring-error reduction method in multi-axis CNC machining

Zhang, Jia; Ma, Jian-wei; Song, De-Ning; Wang, Fuji; Liu, Wei

doi:10.1016/j.ijmachtools.2017.10.008

Cited by 102 publications

(38 citation statements)

References 104 publications

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“…And L i is the curve length from C(u i ) to C(u i + 1 ) which is approximated by jV i T s j. For parametric curves, the curvature k i is given by equation (4)…”

Section: Curvature and Chord Error Estimationmentioning

confidence: 99%

“…For parametric curves, various features have been covered in studies on feedrate planning, including confined chord error/contour error, [2][3][4] acceleration/jerk limitations, 5 servo dynamics constraints, [6][7][8][9] and constant material removal rate. 10 In these works, the basic idea is to obtain the fastest allowable feedrate in feedrate-sensitive regions taking into account different constraints.…”

Section: Introductionmentioning

confidence: 99%

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Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

Liu

Qin

et al. 2018

Advances in Mechanical Engineering

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This article presents an online three-axis non-uniform rational B-splines preprocessing and feedrate scheduling method with chord error, axial velocity, acceleration, and jerk limitations. A preprocessing method is proposed to accurately locate the critical points by reducing pre-interpolation feedrate in feedrate limit violation regions. In the preprocessing stage, the non-uniform rational B-splines curve is subdivided into segments by the critical points and the corresponding feedrate constraints are obtained. A sliding look-ahead window-based feedrate scheduling method is proposed to generate smooth feedrate profile for the buffered non-uniform rational B-splines segments. The feedrate profile corresponding to each non-uniform rational B-splines block is constructed according to the block length and the given limits of acceleration and jerk. The feedrate modification method for non-schedulable short blocks is also described which aimed at avoiding feedrate discontinuity at the junction of two non-uniform rational B-splines blocks. With the proposed method, a successful feedrate profile could be generated with sufficient look-ahead trajectory length in the buffer, which enables that the preprocessing and feedrate planning to be performed progressively online. Simulation and experimental tests with different non-uniform rational B-splines curves are carried out to validate the feasibility and advantages of the proposed method. The results show that the proposed method is capable of making a balance between the machining efficiency, machining precision, and computational complexity.

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“…And L i is the curve length from C(u i ) to C(u i + 1 ) which is approximated by jV i T s j. For parametric curves, the curvature k i is given by equation (4)…”

Section: Curvature and Chord Error Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

Liu

Qin

et al. 2018

Advances in Mechanical Engineering

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“…There are two main practical problems that engineers face in the manufacturing process: to determine the values of the process parameters that will yield the desired product quality [1,2] and to maximize manufacturing system performance using the available resources [3,4]. With respect to the latter, industry nowadays has entered into a phase that focuses on customized, small batches and high parametric variance production, pursued alongside traditional mass-production.…”

Section: Introductionmentioning

confidence: 99%

An integrated curvature surface inspection and prediction system for 5-axis synchronization machining

Kuo

Weng

2021

Int J Adv Manuf Technol

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There is an urgent demand for free form products in industry at the present time because of their superior appearance and the wide variety of functions they perform. Five-axis high-speed CNC machining technology has developed to satisfy this demand, but further improvement in surface quality metric inspection technology is the big challenge it now faces. In this study, the effects of jerk on the performance of five-axis synchronous high-speed CNC ball nose end mills on a freeform turbine mold were investigated. The relationships of characteristics of the images of 14 jerk-cluster finished workpieces with different jerk setting values were established, allowing surface texture features to be analyzed and surface roughness predicted. In addition, machine learning methods were integrated with the surface feature analysis to construct a virtual machining module that acts as a performance prediction system, merging the virtual machine tool functions, surface texture processor and AI roughness prediction processor. Using the geometric information of the workpiece, cutting parameters and machine tool parameters as inputs, product performance metrics combining surface roughness and machining time can be predicted as outputs of the system. The integrated system provides users with a way to evaluate manufacturing performance before performing actual operations and to reduce test time for cutting parameter development. The model is suitable for complex surface finishes as well as for the production of small batches with high parametric variance. In addition, the partial set of image processing and roughness prediction modules can be used alone as an effective intelligent surface quality inspection system.

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“…1,2 A straightforward, curve tool path can be used to solve these problems owing to its high-order continuity. 3,4 However, the curve tool path in freeform surface machining is still not widely used, although the curve tool path generating method and curve interpolation have been studied for many years. [5][6][7] According to the authors, there are three reasons for this lack of utilization.…”

Section: Introductionmentioning

confidence: 99%

Machine tool movement control method combining the benefit of software and real-time interpolator for sculpture surface machining

Han

Zhou³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the traditional sculpture surface machining process, the G01 code is still the mainstream trajectory. Furthermore, real-time feedrate scheduling and corner smooth algorithm in controller constitute the mainstream method to improve the machining process of short line G01 code in sculpture surface machining. However, the G01 code’s discontinuity and the limits of real-time calculation capacity hinder the use of high-speed machine tools and the accuracy of the machined part. In this article, a new method for sculpture surface machining that considers the advantages and disadvantages of both the computer-aided manufacturing software and the real-time controller is presented to promote the use of a continuous curve tool path. The method mainly transfers the computing-intensive feedrate scheduling and trajectory optimization algorithm in the real-time controller to the computer-aided manufacturing software. Furthermore, the computer-aided manufacturing software generates the machining data, which contain the geometry and feedrate information of the machining process. Finally, the real-time interpolator and the mathematical form of computer-aided manufacturing–generated data are designed simultaneously. In the method, the real-time controller can be designed as simple as possible to release more computing resources to the other real-time intelligent modules. The powerful computational capacity of the software guarantees the optimality of the machining process.

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A review of contouring-error reduction method in multi-axis CNC machining

Cited by 102 publications

References 104 publications

Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

An integrated curvature surface inspection and prediction system for 5-axis synchronization machining

Machine tool movement control method combining the benefit of software and real-time interpolator for sculpture surface machining

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