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

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...

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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 transitio

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