A universal velocity profile generation approach for high-speed machining of small line segments with look-ahead

Luo, Fang; Zhou, Yunfei; Yin, Jianping

doi:10.1007/s00170-006-0735-8

Cited by 53 publications

(25 citation statements)

References 3 publications

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“…Substituting u = 0.5 into eq. (15), we have (16) which means that the error caused by multi-period turning interpolation equals a quarter of the module of the difference of the ex-turning displacement vector and post-turning displacement vector. As shown in Figure 7, we have…”

Section: mentioning

confidence: 99%

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High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining

Zhang

Sun

Gao

et al. 2011

Sci. China Technol. Sci.

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CNC machining plays an important role in mechanical manufacturing. A key issue is to improve the machining feedrate while keeping the machining precision and satisfying the acceleration constraints of the CNC machine. For the consecutive micro-line segments interpolation, the velocities at the junction of two segments are the bottlenecks for the machining efficiency. This paper proposes a multi-period turning method to improve the feedrate at the junctions using the linear acceleration and deceleration mode, which utilizes the maximal acceleration capabilities of the NC machine while satisfying the machining precision. A new and more efficient look-ahead method and a feedrate override method are also proposed to boast the global machining speed. The proposed algorithm has been implemented on Blue Sky NC System, and experimented in real material manufacturing. Compared with several existing algorithms, the current algorithm can improve the manufacturing time ranging from 50% to 180%, depending on the machining parameters, and also results in better machining quality. In addition, the algorithm also satisfies the need of real-time interpolation.CNC, micro-line segment, multi-period turning, look-ahead scheme, real-time interpolation, feedrate override Citation:Zhang L X, Sun R Y, Gao X S, et al. High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining.

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Section: mentioning

confidence: 99%

“…Refs. [16,17] introduced the double-linked list look-ahead scheme based on linear and cosine acceleration and deceleration. The speed variation chart is introduced based on the characteristics of acceleration and deceleration in ref.…”

Section: Look-ahead Schemementioning

confidence: 99%

High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining

Zhang

Sun

Gao

et al. 2011

Sci. China Technol. Sci.

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“…The running time of the proposed algorithm, the linear algorithm [10] and the S curve algorithm [1] for each cases of two instances mentioned above were calculated and listed in table 1.…”

Section: T/smentioning

confidence: 99%

Study on Acc/Dec Algorithm Based on Piecewise Polynomial in CNC

Guo

Chen

Zhang

et al. 2011

AEF

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Abstract. In order to improve the stability of feed movement in high speed CNC system, the feedrate planning algorithm based on piece-wise polynomial function was proposed. The flexible transition of feedrate was realized through maintaining linear continuous jerk. The principle of the proposed algorithm was introduced and the method to generate smooth motion profile based on the proposed algorithm was presented. The rapidity, stability and tracking accuracy of the feedrate planning algorithm to linearity, S curve and the proposed one were analyzed. The proposed algorithm is simple and it can be applied in acceleration/deceleration before interpolation in high speed feed movement to improve the stability of it. The proposed algorithm was applied in multi-contour high speed processing and the result indicated that it could improve the stability of large-scale parts motion.

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“…For example, if data check reveals that there is a sharp corner in front, CNC system will adjust the feedrate downward to ensure accuracy; if the corner is not sharp, it will adjust the feedrate upward for less stopping and for maximum average velocity. [7][8][9] Some commercially available CNC systems, such as Fanuc 16i/18i and Heidenhain iTNC530, have provided the feature of look-ahead intelligence. 10,11 However, the related algorithm is unpublished.…”

Section: Introductionmentioning

confidence: 99%

Generation of velocity profiles with speed limit of each axis for high-speed machining using look-ahead buffer

Lee

2010

Int. J. Precis. Eng. Manuf.

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NOMENCLATURE d: total moving distance of a block, area of velocity profile (mm) d i : moving distance of the i th axis v m , v m [i]: maximum velocity of a block and the i th block (mm/ min) v s , v s [i]: starting point velocity of a block and the i th block v e , v e [i] : end point velocity of a block and the i th block v change_dir : starting and end point velocity when direction of an axis changing v i : velocity of the i th axis v low : minimum velocity l i : speed limit of the i th axis α : acceleration and deceleration (mm/min 2 )An efficient look-ahead algorithm to generate velocity profiles is presented in this paper. Algorithm allows for a nonzero starting point velocity and end point velocity of every line segment to increase machining productivity. The paper considers the intelligence of look-ahead to achieve faster machining speed, along with required accuracy. Speed limitation of a specific axis and the direction change of an axis are newly added to the constraints of the velocity profile problem. This paper solves graphically the problem of generating velocity profiles and derives the equations for representing the velocity profile. A method to manage the look-ahead buffer is also proposed. To generate velocity profiles using the look-ahead buffer, three phases are proposed. Phase 1 determines the velocity conditions such as the maximum velocity, starting point velocity and end point velocity. In phase 2, velocity profiles are generated independently. Phase 3 handles the change of the start or end point velocity. This phase 3 is repeated until all adjacent point velocities are the same. The proposed method was utilized in the manufacturing field to engrave aluminum tire molds. It was demonstrated that this method contributes to an increase of the machining accuracy and a reduction of the production time.

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A universal velocity profile generation approach for high-speed machining of small line segments with look-ahead

Cited by 53 publications

References 3 publications

High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining

High speed interpolation for micro-line trajectory and adaptive real-time look-ahead scheme in CNC machining

Study on Acc/Dec Algorithm Based on Piecewise Polynomial in CNC

Generation of velocity profiles with speed limit of each axis for high-speed machining using look-ahead buffer

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