Speed control of CNC machining
CNC machining is developing towards high speed and high efficiency. This includes speed control for CNC machining. In order to make full use of the effective working stroke, the moving parts must be accelerated to the high-speed stroke in a very short time, and stopped instantaneously in the high-speed stroke. That's why controlling the speed of CNC machining.
According to the idea of open control, a method that can automatically accelerate and decelerate the motion of CNC machine tools according to any curve is proposed. This method pushes the automatic acceleration and deceleration control from the traditional fixed mode to a new flexible mode, and explores a new way to effectively improve the dynamic performance of CNC machine tools.
1. Flexible acceleration and deceleration control
In CNC machining, the specific automatic speed control function is usually directly realized by the system program. In this way, it is necessary to change the acceleration and deceleration characteristics of the system or modify the CNC program through the addition and subtraction control, and ordinary users cannot make the CNC machine tool have the best acceleration and deceleration performance according to their own wishes. Therefore, the flexible acceleration and deceleration control method proposed by us adopts the database principle, divides the acceleration and deceleration control into two parts: acceleration and deceleration description and realization, and separates the acceleration and deceleration description from the system program. In the CNC system software, a general control channel is designed, which has nothing to do with the content of the acceleration and deceleration database, and can independently complete the acceleration and deceleration calculation and trajectory control.
2. Flexible automatic acceleration control
Set the acceleration curve, analytical curve and non-analytical curve, and store them in the acceleration and deceleration curve database in the form of a numerical table as a template.
3. Flexible automatic deceleration control
As for the acceleration control, it is stored in the acceleration and deceleration curve library in the form of a numerical table as a template. Reasonable automatic acceleration and deceleration control of CNC machining is an important link to ensure the dynamic performance of CNC machine tools. The traditional automatic acceleration and deceleration control based on fixed curve lacks flexibility, it is difficult to ensure that the acceleration and deceleration process matches the performance of the machine tool, and it is difficult to achieve the best dynamic characteristics of the machine tool movement.
