Hydraulic press is a kind of machine that uses liquid static pressure to process metal, plastic, rubber, wood, powder and other products. It is commonly used in the pressing process and press molding process, such as: forging, stamping, cold extrusion, straightening, bending, flanging, sheet deep-drawing, powder metallurgy, press fitting and so on.
Its principle is to use Pascal's law to make use of the liquid pressure transmission machinery, there are many types. Of course, the use is also based on the need for a variety of things. For example, according to the type of liquid that transmits the pressure, there are two major types of hydraulic presses and water presses.
Hydraulic presses produce higher total pressure and are commonly used for forging and stamping. Forging hydraulic press is divided into die forging hydraulic press and free forging hydraulic press two kinds. Die forging hydraulic press to use molds, while the free forging hydraulic press without molds. China's first 10,000 tons of hydraulic press is free forging hydraulic press.
During the operation of metal extrusion hydraulic press, sometimes the bolts will fall off and fall into the hydraulic cylinder causing serious scratches to the plunger wall. After the problem arises, the traditional method simply can not be realized on-site repair, can only be disassembled and shipped to the manufacturer for patch welding processing or scrap replacement. Due to the lack of spare parts replacement, re-production of spare parts or return to the factory repair time can not be controlled, a long time downtime to the enterprise caused serious economic losses, but also to pay a high amount of processing or repair costs. In order to meet the requirements of continuous production, we need to find a convenient, fast, simple and effective means of maintenance to solve the problem of the equipment, greatly reducing the downtime of the enterprise and reduce the cost of repair and maintenance. Polymer composite materials can be used for on-site repair methods
1. with oxygen - acetylene flame baking scratched parts (master temperature, avoid surface annealing), the perennial penetration of metal surface oil baked out, baked to no sparks splash.
2. Scratched parts with an angle grinder surface treatment, grinding depth of 1 mm or more, and along the cylinder cylinder wall grinding out grooves. Drill deeper holes at both ends of the scratch to change the force situation.
3. Clean the surface with degreasing cotton dipped in acetone or anhydrous ethanol.
4. Apply the homogeneous repair material to the scratched surface; the first layer should be thin, uniform and full coverage of the scratched surface to ensure good adhesion between the material and the metal surface, and then apply the material to the entire repair site after repeated pressure to ensure that the material to fill and achieve the required thickness, so that it is slightly higher than the surface of the outer wall of the cylinder cylinder.
5. The material at 24 ℃ * to achieve the various properties need 24 hours, in order to save time, you can increase the temperature by tungsten halogen lamps, the temperature every 11 ℃, the curing time will be shortened by half, a good curing temperature of 70 ℃.
6. After the material is cured, use a fine grinding stone or scraper to repair and level the material that is higher than the surface of the outer wall of the cylinder barrel, and the construction is completed.