Cause analysis of hydraulic cylinder damage of four-column hydraulic press

The working cylinder of the four-column hydraulic press has heavy load and frequent work, often resulting in premature damage due to improper design, manufacturing or use, so it is very necessary for us to understand its damage and causes.

1. Damaged parts and characteristics of hydraulic cylinder of hydraulic press

Most of the damaged parts of the hydraulic cylinder of the four-column hydraulic press are in the arc part of the connection between the flange and the cylinder wall, followed by the arc part of the transition from the cylinder wall to the bottom of the cylinder, a few cracks occur in the cylinder wall, and some are seriously damaged by cavitation.

(1) cylinder wall. Generally, cracks appear on the inner wall and gradually develop outward. The column grain develops outwards, and the cracks are mostly distributed longitudinally, or at a 40 degree Angle with the cylinder wall bus.

(2) The flange of the cylinder. There are lines on the outer surface of the excessive arc of the cylinder orchid, which gradually expand to the circumference and the inner wall, and finally crack through, or the crack extends to the nail hole, so that the flange falls off locally, and in some serious cases, the whole circle of the flange will even crack and fall off along the transition arc.

(3) Cylinder bottom, annular cracks begin to appear on the inner surface of the transition arc of the cylinder bottom, and gradually expand to the outer wall, and even crack through.

(4) Cavitation, the hydraulic cylinder is also damaged by cavitation resulting in honeycomb pitting, especially in the inner wall of the entrance hole easy to produce cavitation!

2. Damage cause analysis of hydraulic cylinder of single column hydraulic press

There are many factors that affect the working life of hydraulic cylinder. It must be analyzed in combination with the specific situation, but it can be summarized in the following aspects.

(1) Design reasons. The structure size design is unreasonable, such as the flange height is too small or the outside diameter of the flange is too large, so that the comprehensive should be too high and damaged.

(2) Reasons for processing and manufacturing.

(3) Reasons for installation and use.

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