Causes of failure of the crimping machine

Time of issue:

2021-07-12

Causes of failure of the crimping machine The crimping machine is a device that uses hydraulic transmission technology for pressure processing, and can be used to complete various forging and press forming processing. For example, the forging of steel, the forming of metal structural parts, the pressing of plastic products and rubber products, etc. The crimping machine is one of the first machines to apply hydraulic transmission. At present, hydraulic transmission has become the main transmission form of pressure processing machinery. In the heavy machinery manufacturing, aviation industry, plastics and non-ferrous metal processing industries, etc., crimping machines have become important equipment. The hydraulic drive system of the crimping machine is based on pressure conversion, with high system pressure, large flow and high power. Therefore, special attention should be paid to improving the power utilization rate of the prime mover and preventing shock and vibration when the pressure is relieved to ensure safety and reliability. According to the requirements of the pressing process, the main cylinder of the crimping machine can complete the basic working cycle of rapid down, deceleration, pressure-holding delay, pressure relief, return stroke, and stop (any position), and the pressure, speed and pressure-holding time need to be adjustable. The ejection hydraulic cylinder is mainly used to eject the workpiece, and it is required to realize the actions of ejection, retreat, and stop. For example, when the sheet is stretched, auxiliary actions such as lifting, stopping and pressure return of the ejector hydraulic cylinder are required. Sometimes it is necessary to use a press cylinder to compress the blank to prevent the periphery from wrinkling. The crimping machine takes the maximum pressure (tonnage) that may be output by the main actuator (master cylinder) in the main motion as the main specification of the crimping machine, and it has been serialized. The tonnage of the ejector cylinder often adopts 20%-50% of the tonnage of the main cylinder. The ejector cylinder of the extruder can use about 10% of the main tonnage. The tonnage of the blanking cylinder of the double-action stretching and crimping machine is generally about 60% of the tonnage of the stretching cylinder. The speed of the main cylinder is determined by the pressure processing technology. Generally, in the hydraulic system directly supplied by the pump, the working stroke speed does not exceed 50mm/s, the fast forward speed does not exceed 300mm/s, and the fast retreat speed of the crimping machine The feed speeds are equal. Causes of failure of the crimping machine: (1) When the crimping machine crimps the joint, the crimping pressure is too large, and the inner rubber layer of the hose is injured, causing oil leakage. (2) When the crimping machine crimps the joint, the crimping force is not enough, causing oil seepage, oil leakage and pull-out. (3) Under repeated pulse pressure, the jacket rebounds and the buckle pressure decreases, causing oil leakage, oil leakage and pull-out. (4) The machining accuracy of the joint is not up to the standard, causing oil leakage and oil leakage at the joint. (5) The use method is incorrect, resulting in reduced service life.

The hydraulic drive system of the crimping machine is based on pressure conversion, with high system pressure, large flow and high power. Therefore, special attention should be paid to improving the power utilization rate of the prime mover and preventing shock and vibration when the pressure is relieved to ensure safety and reliability.

According to the requirements of the pressing process, the main cylinder of the crimping machine can complete the basic working cycle of rapid down, deceleration, pressure-holding delay, pressure relief, return stroke, and stop (any position), and the pressure, speed and pressure-holding time need to be adjustable. The ejection hydraulic cylinder is mainly used to eject the workpiece, and it is required to realize the actions of ejection, retreat, and stop. For example, when the sheet is stretched, auxiliary actions such as lifting, stopping and pressure return of the ejector hydraulic cylinder are required. Sometimes it is necessary to use a press cylinder to compress the blank to prevent the periphery from wrinkling.
The crimping machine takes the maximum pressure (tonnage) that may be output by the main actuator (master cylinder) in the main motion as the main specification of the crimping machine, and it has been serialized. The tonnage of the ejector cylinder often adopts 20%-50% of the tonnage of the main cylinder. The ejector cylinder of the extruder can use about 10% of the main tonnage. The tonnage of the blanking cylinder of the double-action stretching and crimping machine is generally about 60% of the tonnage of the stretching cylinder.

The speed of the main cylinder is determined by the pressure processing technology. Generally, in the hydraulic system directly supplied by the pump, the working stroke speed does not exceed 50mm/s, the fast forward speed does not exceed 300mm/s, and the fast retreat speed of the crimping machine The feed speeds are equal.

Causes of failure of the crimping machine:

(1) When the crimping machine crimps the joint, the crimping pressure is too large, and the inner rubber layer of the hose is injured, causing oil leakage.

(2) When the crimping machine crimps the joint, the crimping force is not enough, causing oil seepage, oil leakage and pull-out.

(3) Under repeated pulse pressure, the jacket rebounds and the buckle pressure decreases, causing oil leakage, oil leakage and pull-out.

(4) The machining accuracy of the joint is not up to the standard, causing oil leakage and oil leakage at the joint.

(5) The use method is incorrect, resulting in reduced service life.

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