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

A key issue of the machining for the small line block is to improve the machining feedrate while keeping the machining precision and satisfying the acceleration constraints. In this paper, a new approach for continuous small line blocks high speed machining is proposed to avoid the impact of Computer Numerical Control (CNC) equipments caused by acceleration gust. This approach uses the small line flag to distinguish whether the path is small line block. While the paths are continuous small line blocks, this approach can automatically adjust the number of look-ahead segments, and predigest the velocity calculation method of the connection point. We first define what a path is small line block. Then we analyze the restrictions for velocity linking of adjacent processing paths, and propose the approach for continuous small line blocks machining. Finally we design a simulation experiment on 30 points processing of the spline track. The result of the simulation shows that this algorithm can obviously shorten the processing time and make control system more harmonious in high speed machining.

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A Pipeline Designed Reconfigurable CNC Architecture

Materials Science Forum ◽

10.4028/www.scientific.net/msf.697-698.288 ◽

2011 ◽

Vol 697-698 ◽

pp. 288-291

Author(s):

Jing Chuan Dong ◽

Tai Yong Wang

Keyword(s):

Real Time ◽

High Speed ◽

Reconfigurable Architecture ◽

Experimental Results ◽

High Speed Machining ◽

Control Software ◽

The Real ◽

Look Ahead ◽

Reconfigurable Structure

This paper proposed a pipeline based reconfigurable architecture for CNC controllers. The architecture consists of an upper controller and a NC Microcode Processor (NCMP). The control software in the upper controller is a multi-thread program, including a management thread and a NC pipeline thread. The NC pipeline thread in the upper controller converts the machining program into NC Microcode (NCM), which is optimized for the real-time execution in NCMP. A pipelined feedrate plan algorithm is developed for the proposed architecture. The algorithm features a reconfigurable structure and look-ahead ability for high speed machining. Two prototype systems were built to demonstrate the feasibility of the proposed architecture. The experimental results indicate that the NC pipeline is highly reconfigurable and flexible in design compared to the classic implementation.

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An Interpolation Algorithm Based on S-Curve Feedrate Profile and Look-Ahead Function

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.300-301.1389 ◽

2013 ◽

Vol 300-301 ◽

pp. 1389-1396 ◽

Cited By ~ 2

Author(s):

Ke Zheng Sun ◽

Xue Feng Zhou ◽

Gong Zhang ◽

Xian Shuai Chen

Keyword(s):

Machine Tools ◽

High Speed ◽

High Speed Machining ◽

Interpolation Algorithm ◽

Processing Efficiency ◽

Look Ahead ◽

Interpolation Accuracy ◽

Acceleration And Deceleration ◽

S Curve ◽

Time Division

In this paper, a novel interpolation algorithm for high speed machining is presented, which integrates S-curve acceleration/deceleration method in look-ahead function. A time division based speed planning method is used to implement discrete S-curve acceleration/deceleration method. The implementation of the proposed algorithm is given out. The proposed algorithm improves the processing efficiency and avoids the shock of machine tools caused by frequent acceleration and deceleration. The experiment shows that the proposed algorithm satisfies the requirements of interpolation accuracy and machining efficiency in high speed machining.

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Research on Feedrate Planning Model for Continuous Small Lines Contour with Look-Ahead

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.414 ◽

2012 ◽

Vol 591-593 ◽

pp. 414-418

Author(s):

Qing Song Jiao ◽

Shi Yong Wang

Keyword(s):

High Speed ◽

Machining Efficiency ◽

Planning Model ◽

Interpolation Function ◽

Line Segments ◽

Feedrate Planning ◽

Look Ahead ◽

Acceleration And Deceleration ◽

Adjacent Segments

The traditional line or arc interpolation function treats small line segments separately and conducts feedrate planning within each of them. The rather small lengths of the segments result in low machining efficiency, and the frequent acceleration and deceleration also reduce the lifetime of the motor. To solve these problems, a look-ahead feedrate planning model for the continuous small lines contour (CSLC) is proposed in this paper to implement the high speed interpolating. The feedrate planning is elaborated from the aspects of the curvature characteristic of the contour, the turning feedrate, and the federate optimization between the adjacent segments. Simulations show that the proposed algorithm can efficiently improve the machining efficiency.

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