Heidelberg four open four-color offset press, in operation, there is insufficient automatic suction device suction, transfer paper suction instability failure. Due to the urgent production task at that time, there was no timely disassembly of the inspection and maintenance. After this period of operation, the gas distribution valve failed and the suction nozzle was unable to breathe. Therefore, the scene repair first remove the check valve, the valve body folded off the valve body (body diameter 42mm, cast copper material) about 30mm long section of the outer surface of serious grinding "burn" damage, The worn surface has groove marks. This condition either replaces the body or repairs the damaged face to allow the body to mate with the sleeve. Because there is no spare parts, so I decided to use repair welding repair. If the brazing filler metal, the workpiece in the heating brazing process may have a deformation, if the welding will not be deformed, easy to operate, but not the same hardness and copper. But as the scene of the emergency treatment can be used, for which, I first choose to make up with solder, soldering flux to rosin (better than with solder paste effect), with 150w electric iron heated to reach the limit temperature before starting After welding, after the solder layer on the tin to be higher than the original cylindrical size, after this valve body after welding repair sandwiched on the lathe and sanding welding layer, so that it reaches the normal size. The treatment of the valve sleeve is only the valve sleeve sandwiched on the lathe, with 0 # abrasive cloth grinding damaged parts sanding on the line. This completes the repair process in a short time, re-installed on the machine to run, the performance is normal, to meet the requirements. Explain that this method is feasible. In addition to the above-mentioned treatment is feasible, there are also the above-mentioned wear treatment conditions can also be applied adhesive repair. Adhesive coating technology has the advantages of easy operation, wide applicability, good cohesion between coating and matrix, fast repair speed, good quality and low cost. Adhesion coating adhesive used in the anti-wear agents, filling agents, emergency repair agents, adhesives generally similar mud-like, divided into A · B two components, the use of A, B two groups as described Stir the mixture in proportion and apply evenly (clean the coated surface with acetone before coating) and, after curing, turn back to its original size. The hardness of this adhesive after curing hardness and copper is almost the same, the imported adhesive coating such as the United States Belzona series, domestic brands have TS111, these quality is better. Available for peer selection.
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