Speed Control of CNC Precision Parts Processing
How to control the speed of CNC precision parts processing? How much do you know? CNC processing is moving towards high-speed and efficient development. This includes the speed control of CNC machining. To make full use of the effective working stroke, the moving parts must be able to accelerate to the high speed stroke in a very short time and stop accurately in the high speed stroke. This is why it is necessary to control the speed of CNC machining.
According to the open control idea, we propose a method that can automatically accelerate and decelerate the motion of CNC machine tools 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.
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 NC program by adding or subtracting control, so ordinary users cannot make the NC 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 principle of database, divides the acceleration and deceleration control into two parts: acceleration and deceleration description and implementation, and separates the acceleration and deceleration description from the system program. In the NC system software, a general control channel independent of the acceleration and deceleration database content is designed to 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 as templates in the acceleration and deceleration curve library in the form of a number table.
3. Flexible automatic deceleration control
The acceleration control is also stored in the acceleration and deceleration curve library as a template in the form of a number table. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performance of CNC machine tools. The traditional automatic acceleration and deceleration control based on fixed curve is not easy to ensure that the acceleration and deceleration process are compatible with the machine tool performance due to the lack of flexibility, and it is difficult to achieve the best dynamic characteristics of the machine tool movement.
