Molding of plastic parts of vacuum electroplating electric heating pipe

Molding of plastic parts of vacuum electroplating electric heating pipe

Under the premise of not affecting the appearance and use, the plastic parts should try their best to meet the following requirements when designing.

(1) The metallic luster will make the original shrinkage more obvious, so the uneven wall thickness of the product should be avoided to avoid shrinkage, and the wall thickness should be moderate to avoid the wall being too thin (less than 1.5mm), otherwise It will cause poor rigidity, easy deformation during electroplating, poor bonding force of the coating, and easy deformation during use, causing the coating to fall off.

(2) Avoid blind holes, otherwise the treatment solution remaining in the blind holes will not be easy to clean, which will cause pollution in the next process, thereby affecting the quality of electroplating.

(3) The electroplating process has the phenomenon of sharp edges becoming thicker. Sharp edges in electroplating can cause tip discharges, which can cause corner plating to bulge. Therefore, the transition of rounded corners should be adopted as far as possible, and the radius of the rounded corners should be at least 0.3mm. Flat-shaped plastic parts are difficult to be electroplated. The center part of the plated parts is thin, and the coating is thicker toward the edge. The whole coating is in an uneven state. The flat shape should be changed to a slightly arc surface or a matte surface with orange peel . The larger the surface area of electroplating, the greater the difference in gloss between the center and the edge. A slight paraboloid can improve the uniformity of the gloss of the plating surface.

(4) Minimize grooves and protrusions on plastic parts. Because the deep concave parts are easy to be exposed during electroplating, and the protruding parts are easy to be scorched. The depth of the groove should not exceed 1/3 of the groove width, and the bottom should be arc. When there is a grid, the hole width should be equal to the beam width and less than 1/2 of the thickness.

(5) There should be enough mounting and hanging positions on the plated parts, and the contact surface with the hanging tools should be 2 to 3 times larger than the metal parts.

(6) The design of the plastic parts should make the parts easy to demould when they sink, otherwise the surface of the plated parts will be strained or sprained during forced demoulding, or the internal stress of the plastic parts will affect the bonding force of the coating.

(7) When knurling is required, the knurling direction should be consistent with the demolding direction and in a straight line. The distance between the knurled stripes and the stripes should be as large as possible.

(8) Try not to use metal inserts for plastic parts, otherwise the inserts will be easily corroded during pre-plating treatment.

(9) The surface of plastic parts should be guaranteed to have a certain surface roughness.

www.superbheater.com