The guide rail of machine tool is mostly made of steel or cast iron. If this kind of guide rail is scratched, it should be repaired, otherwise it will enlarge the scratch and even affect the use of machine tool. In the long-term use of machine tool guide rail and other friction pairs, due to the different degree of friction between the two contact surfaces, the friction pair surface has different degrees of wear, which seriously affects the machining accuracy and production efficiency of the machine tool. The repair of machine tools and other worn parts usually adopts the methods of inlaying or replacing metal plates and polymer materials, which not only requires a large number of accurate processing and manufacturing, but also often requires manual scraping and grinding of the machined surface. There are many repair procedures and a long construction period.
Solution: using the international advanced polymer 2211f metal repair material to repair the scratch of the guide rail of the gantry milling machine, the scratch part of the guide rail can be repaired in a few hours and put into use. Practice shows that this method is simple, time-saving, good repair quality and low cost. With its unique adhesion, excellent compressive strength, oil resistance and wear resistance, it can provide a long-term protective layer for components, effectively solve the problems that cannot be solved by traditional maintenance methods for large-scale equipment that can not be disassembled. The performance of the equipment is improved, the fit clearance of parts is improved, and the normal operation of production is guaranteed to the maximum extent It saves a lot of time and money, and provides a long-term good guarantee for the normal operation of enterprise equipment.
Repair Principle: polymer composite material is a kind of composite material, which is made of polymer, metal or ceramic superfine powder, fiber, etc. under the action of curing agent and curing accelerator. All kinds of materials draw on each other’s strong points and complement each other in performance, resulting in synergistic effect, so that the comprehensive performance of the composite is better than that of the raw materials. Because of its strong adhesion, mechanical properties and chemical corrosion resistance, it is widely used in the repair of mechanical wear, scratch, pit, crack, leakage and casting sand hole of metal equipment, as well as the chemical anti-corrosion protection and repair of various chemical storage tanks, reaction tanks and pipelines.
Repair process:
- Burn the scratched part with oxygen acetylene flame (control the temperature, avoid surface annealing), and bake the oil on the surface of permeating metal all the year round until there is no spark.
- The scratched part shall be treated with angle grinder, the grinding depth shall be more than 1 mm, and the groove shall be polished along the guide rail, preferably dovetail groove (as shown in the figure). The scratch on both ends of the hole is deepened to change the stress condition.
- Clean the surface with absorbent cotton dipped in acetone or absolute ethanol.
- Apply the mixed and uniform 2211f to the scratched surface; the first layer should be thin and evenly covered with the scratch surface to ensure the best bonding between the material and the metal surface. Then, apply the material to the whole repair part and press repeatedly to ensure that the material is filled and reaches the required thickness, which is slightly higher than the rail surface.
- It takes 24 hours for the material to reach all properties at 24oc. In order to save time, the temperature can be increased by halogen lamp. The curing time will be shortened by half when the temperature is increased by 11oc. The best curing temperature is 70oC.
- After the material is solidified, the material higher than the surface of guide rail shall be repaired and leveled with fine grindstone or scraper, and the construction is completed.
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