Wear and Tear Caused by Long-Term Operation of the Forming Hydraulic Press

1. Poor Machining Quality:

• The large working table area, composed of several cast iron plates, may exhibit uneven thickness during processing if the consistency of each plate is not ensured. Unevenness may result in abrasion during table movement. Subsequent wear debris can further intensify the abrasion, leading to clogging of oil grooves and holes, rendering lubricants ineffective. Additionally, due to the often inadequate surface roughness of the working table underside and plates, it is challenging to form an oil film, frequently leading to dry friction.

2. Uneven Contact:

• The small surface of the working table has a large contact area with the plates, making it difficult to achieve the required 75% or more contact area, unlike the scraped and honed surfaces of machine tool guide rails. Typically, the contact area is only around 30% to 40%, and in some cases, it may be point or line contact. Poor stiffness of the lower crossbeam can also affect uniform contact between the working table and plates.

3. Difficulty Clearing Oxide Scale:

• In the forging process, a considerable amount of oxide scale may fall, easily dropping onto the plates from the joints and gaps on the working table surface. The high hardness of the oxide scale exacerbates plate wear. Design considerations should include devices for removing oxide scale or preventing its deposition on friction surfaces.

4. Deformation:

• The large flat surface of the working table, coupled with poor stiffness, is susceptible to deformation. During forging, steel ingots and material heads often fall from a certain height onto the table, causing deformation. Points that have been deformed due to impacts wear out faster during prolonged movement. Additionally, the prolonged exposure of the working table to the high temperature of steel ingots and material heads can result in temperature differences between the top and bottom surfaces, causing deformation. Typically, severe heating occurs in the center, causing protrusions on the table surface, leading to faster wear on the sides.

Moreover, wear on the moving working table can induce vibrations in the hydraulic press, which is highly detrimental to its operation. Maintenance personnel can refer to methods outlined in the document "Three Major Persistent Issues in Hydraulic Press Hydraulic Systems and Solutions" to enhance preventive measures for the three major issues and promptly address faults, ensuring the correct and safe use of the equipment.