The goal of CNC machining china is to achieve high-speed, high-precision and high-efficiency machining. How to ensure the optimal acceleration and deceleration control law aiming at the shortest transition process time under the premise of stable machine tool movement, so that the machine tool has the acceleration and deceleration characteristics that meet the requirements of high-speed machining, is the key issue of acceleration and deceleration research.

There are two types of acceleration and deceleration control schemes: pre-acceleration and deceleration control and post-acceleration and deceleration control: pre-acceleration and deceleration control is generally located before interpolation and after interpolation preprocessing. The object of acceleration and deceleration control is the commanded feed rate; post-acceleration and deceleration control is usually After the interpolator and before the servo controller, control the feed speed of each motion axis, etc.

The post-acceleration and deceleration control does not need to calculate the deceleration point, the algorithm is relatively simple, but if the servo gain of each motion axis is different, it is easy to cause a large trajectory contour error and affect the motion accuracy. Therefore, the current main application of acceleration and deceleration control technology. The acceleration and deceleration control method can be summarized as the traditional acceleration and deceleration method and the flexible acceleration and deceleration method:

Traditional acceleration and deceleration methods include trapezoidal acceleration and deceleration methods and exponential acceleration and deceleration methods; flexible acceleration and deceleration methods include trigonometric function acceleration and deceleration methods, S-curve acceleration and deceleration methods, and polynomial acceleration and deceleration methods. Traditional trapezoidal and exponential acceleration and deceleration affect the smoothness of motion due to sudden changes in acceleration. Flexible acceleration and deceleration have attracted much attention in high-speed machining due to the continuous acceleration.