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Multi-period corner small straight-line segment interpolation method based on S curve acceleration/deceleration control

A small straight line, acceleration and deceleration technology, applied in the direction of program control, computer control, general control system, etc., can solve problems such as reducing calculation efficiency, discontinuous acceleration change, and prolonging calculation time.

Inactive Publication Date: 2012-10-10
ACAD OF MATHEMATICS & SYSTEMS SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] However, the defect of this interpolation method based on the linear acceleration and deceleration method is that there are places where the acceleration changes are discontinuous, which easily causes vibration of the machine tool and reduces the quality of the machined surface.
The corner and its connection with the straight line are calculated using a discrete method, and the transition time of the corner is adjusted in a decreasing manner of a positive integer number of interpolation cycles, which reduces the calculation efficiency due to the complexity of the calculation
The backtracking processing in the look-ahead processing will also prolong the calculation time. Furthermore, the scope of application of this patented technology is limited to three-axis CNC machine tools

Method used

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  • Multi-period corner small straight-line segment interpolation method based on S curve acceleration/deceleration control
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  • Multi-period corner small straight-line segment interpolation method based on S curve acceleration/deceleration control

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Embodiment Construction

[0055] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation process and performance analysis of the present invention will be further described in detail below in conjunction with the accompanying drawings and simulation examples.

[0056] see figure 1 , first specifically introduce several terms and concepts related to multi-cycle corner transition in the present invention:

[0057] The idea of ​​multi-period optimal corner transition proposed by the present invention is to disperse the change of the processing speed direction at the corner which was originally completed in one interpolation cycle into a processing method which is gradually changed in multiple interpolation cycles, which is used to improve the corner The corner machining speed is limited by the geometric parameters at the corner of the machined path. The corner here is the connection point of two adjacent small straight segments that are not on ...

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Abstract

The invention discloses a multi-period optimal corner small straight-line segment interpolation method based on S curve acceleration / deceleration control in a numerical control system. The method comprises the following steps of: based on the limitations of the machining precision of a machine tool and the maximum machining speed of each driving shaft, setting the acceleration speed at the joint of the corner and the straight-line segment to be zero according to geometrical parameters of each corner on a machining path, the maximum machining acceleration speed of each driving shaft and an optimization target, and determining and adjusting the optimized corner interpolation parameters in multi-period transition at each corner, so that the acceleration speed at two ends of each small straight-line segment meets the reachability requirement of the S curve acceleration / deceleration control mode; and calculating the time at each acceleration / deceleration stage of each straight-line segment according to the S curve acceleration / deceleration mode, respectively performing straight-line segment and corner interpolation on each small straight-line segment, sequentially outputting interpolation point sequences in real time, and driving a numerical control machine tool to execute the machining operation. By the method, the vibration of the machine tool is reduced, the quality of the surface of a workpiece is improved, the calculation speed is high, the real-time machining requirements can be met, and the method is suitable for different models of three-axis, four-axis or five-axis numerical control machine tools.

Description

technical field [0001] The invention relates to a multi-period corner small straight line segment interpolation method based on S-curve acceleration and deceleration control of a numerical control system, which belongs to the technical field of digital control processing of numerical control machine tools. Background technique [0002] When CNC machine tools process complex curved surfaces, they usually discretize the processed surface into a large number of small straight line segments within the set processing accuracy range. In this way, during the processing of small straight line segments, especially at corners, the processing direction of the CNC machine tool needs to be changed frequently, causing the machine tool to start and stop frequently, which limits the processing speed, and is prone to vibration at the same time, which affects the surface to be processed. Machining accuracy and surface finish. In addition, if the control method of linear acceleration and dece...

Claims

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Application Information

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IPC IPC(8): G05B19/41
Inventor 张立先李洪波高小山孙瑞勇
Owner ACAD OF MATHEMATICS & SYSTEMS SCIENCE - CHINESE ACAD OF SCI
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