Common faults of hydraulic presses

During the operation of metal extrusion hydraulic presses, bolts sometimes fall off and fall into the hydraulic cylinder, causing serious scratches on the plunger wall. After the problem occurs, traditional methods cannot achieve on-site repair at all. Since there is no spare parts to replace, the time for re-production of accessories or return to the factory for repair cannot be controlled, and long-term downtime causes serious economic losses to the company, and high processing or repair costs must be paid. In order to meet the requirements of continuous production of enterprises, it is necessary to find convenient, fast, simple and effective maintenance methods to solve the equipment problems, reduce the company's downtime and production time, and reduce maintenance costs.

Operation steps:

1. Use oxygen-acetylene flame to bake the scratched part (control the temperature and avoid surface annealing), bake out the oil that has been infiltrating the metal surface for many years, and bake until there is no spark.

2. Use an angle grinder to treat the scratched part, grind to a depth of more than 1 mm, and grind out grooves along the outer wall of the cylinder. Drill holes at both ends of the scratch to deepen and change the stress conditions.

3. Clean the surface with absorbent cotton dipped in acetone or anhydrous ethanol.

4. Apply the well-mixed repair material to the scratched surface; it should be thin, even and cover the scratched surface completely to ensure that the material is bonded to the metal surface. Then apply the material to the entire repair area and press repeatedly to ensure that the material is filled and reaches the required thickness, making it slightly higher than the outer wall surface of the cylinder.

5. It takes 24 hours for the material to fully achieve various properties at 24°C. In order to save time, the temperature can be increased by a halogen tungsten lamp. For every 11°C increase in temperature, the curing time will be shortened by half, and the curing temperature is 70°C.

6. After the material is cured, use a fine grinding stone or scraper to repair and level the material that is higher than the outer wall surface of the cylinder, and the construction is completed.