The Track Motion Control of the Flying Shear Based on Quintic Spline Curve

Abstract

If the acceleration and deceleration of the flying shear track motion is constant, the acceleration and jerk of the tracking algorithm are not continuous, these result in a mutation of the force on moving parts and a great impact on the abrasion and service life of the equipment. Moreover, these affect the following effect of the servo system, make the cutting precision decreased. To improve the shear precision and cross section quality, an algorithm of the synchronous motion tracking of the flying shear is proposed. This algorithm directly uses the quintic spline curve profile to track the strip feed without any cam profile table. The quintic spline curve trajectory of the flying shear can make the velocity and acceleration of the blade rotation movement smooth. According to the length that user inputs, the control system uses iteration method to calculate the initial waiting length of the feed to carry out long cutting or short cutting automatically. Nonlinear synchronous movement is carried out to synchronize the horizontal speed of the flying shear with the feed speed of the strip on the cutting zone, which ensures the high-precision cutting length and smooth cutting cross section.