CNC end face cylindrical grinder is a commonly used machine tool for mechanical processing. There are high requirements for motion stability, commutation accuracy, and commutation frequency. The motion inertia of large machine tools is large, and when they change direction, it will cause a sharp increase in back pressure, resulting in reversal impact, which will have a significant impact on the machine tool. Therefore, the problem of smooth reversal has become an important factor restricting the increase of grinding machine working speed and machining accuracy. The reversing method and control parameters in the system have a decisive effect on the reversing impact, and hydraulic transmission is used.
Due to the fact that in hydraulic systems, when the hydraulic transmission changes direction. The directional valve port instantly closes, and the oil circuit suddenly disconnects, making it impossible to drain the oil in the return chamber. The greater the kinetic energy, the greater the reversal impact. For CNC end face cylindrical grinders operating with high inertia, the commutation impact is significant, which not only affects the machining accuracy of the machine tool, but also hinders normal operation and service life.
The commonly used hydraulic transmission reversal methods for CNC end face cylindrical grinders are:
1. Adopting the directional method of stroke directional valve.
2. Adopting the direction change method of electro-hydraulic directional valve.
3. Adopting the directional method of electromagnetic directional valve.
The travel switch is driven by the travel block to send a direction change signal, and the direction change valve is changed to an electromagnetic direction change valve. Make the electromagnet move to push the slide valve to change direction, but it is a switch type hydraulic valve that opens or closes according to commands, instantly connecting or cutting off the return oil channel. Such a hydraulic reversing system will have a significant impact during reversing.