1. The movement of the crank connecting rod is rigid, and has nothing to do with the size, shape, deformation resistance and other factors of the stamped parts. As long as the crankshaft rotates, it must force the slider movement. If the deformation resistance of the part is too large and exceeds the allowable range of the punch strength, it will cause damage to the linkage, resulting in mechanical accidents such as breakage of the connecting rod, deformation of the crankshaft and drive shaft, breakage of the gear teeth, and breakage of the fuselage.
This situation is different from forging machines such as hydraulic presses, forging hammers, and screw friction presses. The hydraulic system implements automatic protection, so that the movable beam stops motion, the machine tool will not be damaged, and when the forging hammer and screw friction press are overloaded, the hammer head will be raised at the lower end and will not cause damage to the machine tool.
Therefore, in order to ensure the safe production of hydraulic presses, on the one hand, the size of the deformation resistance of the parts must be taken into consideration, and the equipment should be reasonably selected. On the other hand, the hydraulic press should be used correctly to adjust the mold to prevent overloading due to improper mold adjustment.
2. In the range where the strength of the hydraulic press is allowed, the resistance that the hydraulic press can overcome is a function of the crank angle.
With the change in the size of the crank angle, there is a large difference in the magnitude of the large load that the mechanism can withstand. The nominal tonnage of the hydraulic press refers to the load value that the mechanism can hold when the crank is at a small angle 180 DEG below the bottom dead center. This load cannot be achieved when the corner is away from the lower point. If the deformation resistance is to be overcome when the corner is far away from the dead point, the machine tool will be damaged if it fails to reach the nominal tonnage. Therefore, it is not allowed to carry out large volumetric deformation processes such as extrusion and forging that are close to the nominal tonnage load on the hydraulic press.
3, the deformation resistance of stamping all passed to the hydraulic press body, the hydraulic press itself forms a closed force system. When the hydraulic press works, there is no other pressure on the foundation than its own weight (the imbalance of the transmission system will cause vibration of the foundation), which is also different from the forging hammer.
This situation is different from forging machines such as hydraulic presses, forging hammers, and screw friction presses. The hydraulic system implements automatic protection, so that the movable beam stops motion, the machine tool will not be damaged, and when the forging hammer and screw friction press are overloaded, the hammer head will be raised at the lower end and will not cause damage to the machine tool.
Therefore, in order to ensure the safe production of hydraulic presses, on the one hand, the size of the deformation resistance of the parts must be taken into consideration, and the equipment should be reasonably selected. On the other hand, the hydraulic press should be used correctly to adjust the mold to prevent overloading due to improper mold adjustment.
2. In the range where the strength of the hydraulic press is allowed, the resistance that the hydraulic press can overcome is a function of the crank angle.
With the change in the size of the crank angle, there is a large difference in the magnitude of the large load that the mechanism can withstand. The nominal tonnage of the hydraulic press refers to the load value that the mechanism can hold when the crank is at a small angle 180 DEG below the bottom dead center. This load cannot be achieved when the corner is away from the lower point. If the deformation resistance is to be overcome when the corner is far away from the dead point, the machine tool will be damaged if it fails to reach the nominal tonnage. Therefore, it is not allowed to carry out large volumetric deformation processes such as extrusion and forging that are close to the nominal tonnage load on the hydraulic press.
3, the deformation resistance of stamping all passed to the hydraulic press body, the hydraulic press itself forms a closed force system. When the hydraulic press works, there is no other pressure on the foundation than its own weight (the imbalance of the transmission system will cause vibration of the foundation), which is also different from the forging hammer.
4. The speed and acceleration of the motion of the plots change with the position of the crank angle and change periodically.
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