CNC machining is developing towards high speed and high efficiency. This includes the speed control of CNC machining. If we want to make full use of the effective working stroke, we must make the moving parts accelerate to the high speed stroke in a very short time, and stop in the high speed stroke instantaneously. This is why CNC machining speed control.
According to the open control idea, we put forward a method of automatic acceleration and deceleration control for the motion of CNC machine tool according to any curve. This method pushes the automatic acceleration and deceleration control from the traditional fixed mode to the new flexible mode, and explores a new way to effectively improve the dynamic performance of CNC machine tools.
In CNC machining, the specific automatic speed control function is usually realized by the system program directly. In this way, it is necessary to change the acceleration and deceleration characteristics of the system or to control the addition and subtraction to modify the NC program, so ordinary users can not make the CNC machine tool have the best acceleration and deceleration performance according to their own will. Therefore, the flexible acceleration and deceleration control method is based on the principle of database. The acceleration and deceleration control is divided into acceleration and deceleration description and implementation, and the acceleration and deceleration description is separated from the system program. In the software of numerical control system, a general control channel is designed which has nothing to do with the contents of acceleration and deceleration database, which can complete acceleration and deceleration calculation and trajectory control independently.
The acceleration curve, analytic curve and non analytical curve are set and stored in the acceleration and deceleration curve library as templates in the form of data table.
As for acceleration control, it is stored in the acceleration and deceleration curve Library in the form of data table. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performance of CNC machine tools. Due to the lack of flexibility, the traditional automatic acceleration and deceleration control based on fixed curve is not easy to ensure that the acceleration and deceleration process is compatible with the performance of the machine tool, so it is difficult to achieve the best dynamic characteristics of the machine tool