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What is the function of the clutch and brake of the punch press? Why should their actions be coordinated with each other?
In the process of stamping, when the punch is started, the flywheel, as an energy storage part, should rotate all the time, but due to operational needs, the slider has to move and stop from time to time. It is impossible for a punching machine with a flywheel to stop the movement of the slider immediately by turning off the motor, because the flywheel has a large inertia, the starting and braking process takes a long time, and the energy consumption is also large. In order to achieve the purpose of keeping the flywheel and controlling the movement of the slider, a mechanism can be arranged behind the flywheel that can disengage or engage the flywheel with the crankshaft to stop or move the slider. This mechanism is a clutch. When the clutch is disengaged, the moving parts such as the crank and the sliding block still have a certain amount of kinetic energy, and they will continue to rotate and move, so that the sliding block cannot stop at the required position. The slider will automatically fall due to its own weight. For this reason, a device needs to be provided on the clutch shaft to absorb the remaining kinetic energy of the moving parts after the clutch after the clutch is disengaged, and to brake the crankshaft to stop the slider at the required position. This device is called a brake. The actions of the clutch and brake must be closely coordinated with each other. Except for the brakes of a few small presses that often work, for most small presses and all large and medium presses, the brake should be effective immediately after the clutch is disengaged, otherwise the slider cannot be guaranteed to stop at a certain position. Before the clutch is engaged, the brake must be disengaged, otherwise it will cause severe heating and wear of the friction element, or even fail to work. When the general press is not working, the clutch is always in the disengaged state, and the brake is always in the braking state. Previous post: What are the reasons for unilateral burrs in metal stamping parts?