For some of the more complex shape of the parts, you can follow the shape of the shape of the design of special insulating fixtures, which can greatly improve production efficiency. If the bearing bore or outer diameter for partial chrome plating, you can design a special bearing chrome-plated fixture, and this fixture can also be used repeatedly.
Usually according to their plating area can be divided into full plating and partial plating two. Many parts that need to be partially electroplated are to be insulated for their non-plated surfaces. This requires different local insulation methods to meet the technical requirements of construction so as to ensure that non-plated parts of the parts will not be plated, especially if there are special requirements Parts.
According to daily work experience, are introduced several commonly used plating electroplating process.
1. Bandage method
This method is to use tape or plastic cloth, tape and other materials on the non-coated insulation protection, the method of dressing according to the shape of the parts. Bandage method for simple parts, especially the shape of the circular parts. Bandage method is the simplest method of insulation protection.
2. Special fixture method
Special fixture method, also known as copying fixture method. In other words, for some of the more complex shape of the parts, you can follow the shape of the shape of the design of special insulating fixtures, which can greatly improve production efficiency. If the bearing bore or outer diameter for partial chrome plating, you can design a special bearing chrome-plated fixture, and this fixture can also be used repeatedly.
3 wax protection law
Wax insulation is characterized by good adhesion with the parts, the use of a wide temperature range, the end of the insulation layer will not tilt, therefore, suitable for the insulation end of the dimensional requirements of high tolerance, the shape of the more complex parts. In addition, wax formulations can be reused, the loss is small, but its use is more complex, longer cycle. When applying the wax preparation, the parts should be preheated to 50 to 70 ° C and then coated with the melted wax preparation. Apply a thin layer covering the entire surface to be insulated. The wax should not be solidified halfway and then repeatedly applied To the desired thickness. After the coating has not been cooled to room temperature before the warm state, with a knife on the insulation end trim, and then repeatedly rub the cotton ball with gasoline to be plated surface, the operation should be very carefully. After plating, the wax preparation can be melted and recovered in hot water or special wax barrel, and then parts can be cleaned with gasoline or other solvents or water-soluble cleaning agents.
4. Coating insulation method
Galvanized paint often used insulation coating insulation. This method of insulation protection is easy to operate and can be applied to complex parts. Commonly used insulation coating vinyl chloride anti-corrosion varnish (such as G52-1.G52-2), PVC insulation coating, such as nitro rubber.
Article from NdFeB Industry Network