1, the processing quality is not good
The worktable has a large area. The cast iron backing plate is generally composed of dozens of pieces. How much is the hydraulic press? If the thickness of each backing plate cannot be guaranteed to be completely consistent during the processing, unevenness will inevitably occur after assembly, which will wear out when the worktable moves. The worn cast iron chips fall on the backing plate, which further aggravates the wear and causes the oil groove and the oil hole to be blocked, so that the lubricant does notCan work. In addition, because the lower surface of the workbench and the processing roughness of the backing plate are often not up to the requirements, it is difficult to form an oil film, often in a dry grinding state.
2. Uneven contact
The small surface of the worktable and the contact surface of the backing plate are large, so it is impossible to scrape like the guide surface of the machine tool, and it is difficult to ensure that the contact area of more than 75% is met. Now the general contact area can only reach 30% to 40%, and some even point or line contact. When the stiffness of the lower beam is very poor, it will also affect the uniform contact between the workbench and the backing plate.
3, oxide skin is not easy to remove
During the forging process, a lot of oxide scale is dropped, and it is easy to fall from the joint of the work table and the gap on both sides to the backing plate. The high hardness of the oxide scale aggravates the wear of the backing plate. Care should be taken to design devices that remove scale or prevent scale from falling on the friction surface.
4. Deformation
The table plane is very large, but the rigidity is poor, plus the seat, abrasive tools, forgings, etc. are very heavy. When forging ingots and heads often fall from a certain height to the table, so that the table deformation. In the process of long-term movement, the bumps that are smashed and deformed wear faster. In addition, due to the long-term baking of hot ingots and heads on the worktable, the upper surface and lower bottom surface of the worktable will be warm.The difference is larger, can also cause deformation. Generally, the middle is heated badly, the table top is raised, and both sides wear faster.
In addition, the wear and tear of the mobile workbench will cause the hydraulic machine to vibrate, which is extremely unfavorable to the operation of the hydraulic machine. Maintenance personnel can refer to the three stubborn problems of the hydraulic system of the hydraulic machine and the methods in this paper to strengthen the prevention of the three stubborn problems of the hydraulic machine, solve the faults in time, and use the equipment correctly and safely.