Speed u200bu200bcontrol of CNC machining

CNC machining is developing towards high speed and high efficiency. This includes the speed control of CNC machining. In order to make full use of the effective working stroke, it is necessary to make the moving parts accelerate to the high-speed stroke in a very short time, and stop instantly during the high-speed stroke. This is why speed control for CNC machining is required.

According to the open control idea, we propose a method for automatic acceleration and deceleration control of 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 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 system program is generally used to directly implement specific automatic speed control function. In this way, it is necessary to change the acceleration and deceleration characteristics of the system or to modify the numerical control program by adding and subtracting control, so ordinary users cannot make the numerical control 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 CNC system software, a general control channel independent of the content of the acceleration and deceleration database is designed, which independently completes 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 library in the form of a number table as a template.

3. Flexible automatic deceleration control

The same as acceleration control, it is stored in the acceleration and deceleration curve library in the form of a number table as a template. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performance of CNC machine tools.