The Research Of NURBS Curve Interpolation Algorithm Based On Speed Look-ahead

Numerical control technology and equipment are the important foundation of modern industrial manufacturing modernization,and one of the main development directions of numerical control technology is high speed and high precision machining.In the development of numerical control technology,interpolation algorithm and speed control are the main factors influencing the processing speed and accuracy directly,the NURBS curve interpolation technology has become a high-end CNC system,a necessary ability.In order to realize that the end-effector of the interpolation stage can pass through all processing points smoothly,this paper proposes a NURBS curve interpolation algorithm based on speed perspective.While carrying out the NURBS interpolation,the algorithm has the ability to analyze the path,find and quickly process the abrupt point of velocity through the prospective control of speed,which greatly improves the processing speed and precision.Firstly,the fast calculation method of NURBS curve is analyzed,and the error is compensated by the improved estimation and correction method.For the acceleration and deceleration control required in the process of interpolation,the current s-type acceleration and deceleration control method is adopted in this paper.Then,the forward speed control is analyzed and a forward algorithm is designed to calculate the mechanical properties of the control object easily.In addition,under the comprehensive consideration of various relevant constraints,the velocity planning is completed through the pretreatment of interpolation data points and the improved s-type acceleration and deceleration control algorithm based on the speed perspective.Lastly,special trajectory curve as the machining path,the interpolation algorithm in MATLAB simulation,the emphasis was on the feed speed of interpolation points,the effect of machining accuracy and speed of a forward-looking and at line segment connecting a smooth transition.Based on the widely used industrial SCARA robot as the control object,through the Robotic Toolbox Toolbox to build SCARA robot model,on the whole interpolation algorithm simulation,analysis of angular velocity of each joint.Finally,the validity of the algorithm is verified.