Surface grinder is a commonly used machine tool for mac […]
Surface grinder is a commonly used machine tool for machining. There are higher requirements for smoothness of motion, commutation accuracy, and commutation frequency. At present, surface grinders are developing towards large-scale and high-speed development. The reciprocating speed of some surface grinders' worktable has reached 40m/min. Large-scale high-speed surface grinders have a large inertia of motion. When they change direction, the back pressure will rise sharply, which will cause the reverse impact, which will have a catastrophic impact on the machine tool, so the smoothness of the commutation problem has become a constraint An important factor in improving the working speed and machining accuracy of a grinder.
The commutation mode and commutation control parameters in the system have a decisive effect on the commutation impact. The surface grinder adopts hydraulic transmission. The design of a new hydraulic reversing system is imminent. The following discusses the reversing impact of the grinder from the perspective of commutation methods and control strategies.
Mechanism of commutation shock
Because in its hydraulic system, when the hydraulic drive surface grinder changes direction. The valve port of the reversing valve is instantly closed, and the oil circuit is suddenly disconnected, so that the oil in the oil return cavity cannot be drained. The larger m and v are, it can be seen. The greater the kinetic energy, the greater the commutation impact. Jinjitong reminds that for a surface grinder with large inertia and high speed operation, the commutation impact is huge, which not only affects the machining accuracy of the machine tool, but also hinders normal operation and service life. People all hope that the machine tool realizes the ideal commutation. The so-called ideal commutation means, usually. Under any working conditions, the speed of the machine tool can be smoothly reduced according to a certain ideal curve without sudden change. The moment the valve is closed, the speed is just reduced to zero, that is, all the kinetic energy is converted into heat energy and is consumed.