In line with the ideal control curve, the surface grind […]
In line with the ideal control curve, the surface grinder adopts a hydraulic drive reversing system with an electro-hydraulic proportional valve. An intelligent control type commutation system is realized by actively reducing the flow to reduce the speed, and finally achieving the purpose of smooth and impact-free commutation. Ideal commutation can also be achieved under the change of working conditions. This kind of hydraulic transmission reversing system realizes very good intelligent control of the output displacement or speed, so that the reversing process has a certain controllability, so it has a very wide range of applications.
The mechanism of commutation impact is analyzed. Abstract: The commutation process of the surface grinder is briefly discussed. And compare the advantages and disadvantages of several commonly used commutation methods. Finally, the intelligent control commutation system is introduced, and the concept of ideal control curve is proposed.
The movement of the table is continuous reciprocating movement, and the 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 40 resistance and n. Large-scale high-speed surface grinders have great inertia. When they change direction, the back pressure will rise sharply, which will cause the reverse shock, which will have a catastrophic impact on the machine tool, so the smoothness of the direction change has become a constraint An important factor in improving the working speed and machining accuracy of a grinder.
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, it can be seen. The greater the kinetic energy, the greater the commutation impact. 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 can achieve 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 kinetic energy is converted into heat energy and is consumed. The ideal commutation process is impactless