A second-hand Heidelberg four-color, four-color offset printing machine in our factory has a problem that the automatic paper feeding device has insufficient air suction and the paper feeder has unstable paper suction during operation. At that time, the production task was very urgent, so it was not removed in time for inspection and maintenance. For this reason, after a period of operation, the valve failed and the suction nozzle could not suck. Therefore, the on-site repair first dismantled the gas distribution valve for inspection. After the valve body was dismantled, it was found that the valve body (valve body diameter 42mm, cast copper material) had a section of about 30mm long outer surface that was severely ground and "burned". There are groove marks on the worn surface. In this situation, either replace the valve body or repair the damaged surface so that the valve body can properly cooperate with the valve sleeve.
Because there are no spare parts, I decided to use repair welding repair first. If copper brazing is used, the workpiece may be deformed during heating and brazing. If soldering is used, it will not be deformed. The operation is simple, but the hardness cannot be equal to that of copper. However, it can be used as an emergency treatment on site. For this reason, I first choose to use solder to fill, soldering with rosin as a flux (which is better than using solder paste), heated with a 150w electric soldering iron, and can only start after reaching the limit temperature After welding, the tin layer should be higher than the original outer circle size, and then the repaired valve body is clamped between the lathe precision turning and sanding welding layer to make it reach the normal size. The treatment of the valve sleeve is simply to clamp the valve sleeve on the lathe, and sand the damaged part with 0 # emery cloth. In this way, the repair process is completed in a short time, and the machine is reinstalled and used for operation. The performance is normal and the use requirements are met. Explain that this method is feasible.
In addition to the above-mentioned treatment is feasible, there are conditions such as the above-mentioned wear treatment can also be repaired by stick coating technology. Adhesive coating technology has the advantages of convenient operation, wide applicability, good combination of coating and matrix, fast repair speed, good quality, low cost and so on. Adhesives used in adhesive coating include abrasion resistance agent, filling agent, emergency repair agent, etc. Adhesive coating agent is generally similar to mud, divided into two components of A · B. Proportionally mix and mix, then apply (the surface to be coated should be cleaned with acetone before application), turn after solidification, and return to the original size. The hardness of this adhesive coating after curing is almost the same as that of copper. Imported adhesive coatings such as the Belzona series from the United States and domestically produced TS111 grades are of better quality. Can be chosen by peers.
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