In order to facilitate production and processing, injection molded parts are now used, because injection molded parts can be mass-produced, with lower plating costs, light weight, and flexible design, replacing metal plating in more and more fields. Of course, there are also various problems in the electroplating of injection molded parts, and there are many reasons for these problems. In order to ensure the quality of the product and reduce the cost, the relevant factors of the electroplating process should be fully considered when designing.
When designing the electroplating mold for injection molded parts, it is necessary to pre-determine the electroplating nozzle or the shelf point of the electroplating pendant, because about 70% of the processes in the electroplating process will cause product deformation. According to the principle of thermal expansion and cold contraction, the shrinkage rate of electroplated products is generally designed to be about one-thousandth. The thinner the product, the higher the shrinkage rate of the product.
The adhesive of the product should not be too fine to avoid falling off or breaking during the electroplating process. Please pay attention to the top discharge, and use R angle or design water ball as much as possible to design. Pay attention to the peeling tilt to prevent peeling. Predetermine the exhaust port to prevent defects such as valves and sockets. The design should fully consider the problem of the clamping line. Fully consider the influence of the appearance of the thimble, and reverse the R angle as much as possible to avoid the position of the thimble from being electroplated.
The surface of the injection molded parts is smooth, and where there is no need for mirror gloss, a little shape or pattern should be made as much as possible, so that electroplating can improve the adhesion of the coating and cover up small defects and scars. There must be no blind holes. If necessary, the depth should be 1/2-1/3 of the diameter, the distance between the slots or holes should not be too close, and the edges should be rounded.
Injection molded parts must have sufficient strength. There must be sharp edges, sharp corners and serrations. If necessary, the edges should be as round as possible. ABS materials cannot have recycled materials. Otherwise it will affect the electroplating production. Large-area floor plans should be avoided as much as possible. If necessary, the high surface should face down or on both sides as much as possible. Leave as many installation positions as possible on the injection molded parts to obtain uniform electroplating. The installation position is designed to not affect the appearance, to prevent the thin-walled plastic from deforming, and it is not easy to bend underwater. Otherwise, the conduction will be affected, and the shape of the workpiece assembly will not be affected when necessary, and the nozzle position can be connected to the lower edge of the workpiece as much as possible.