Surface treatment

After bending, riveting and other processes, the workpiece needs to do surface treatment. Surface treatment methods are different according to sheet metals. It is usually do surface electroplating after cold plate processing, applying phosphating before painting. The plating board surface need to be cleaned, degreased and painted. Stainless steel plate (mirror plate, mist panel, wire-drawing board) can be brushed before bending without painting; if painting is needed, pre-process should be applied; Aluminum plate generally applies oxidation treatment, and the base color is chosen according to painted color, commonly used are black and natural oxidation; Aluminum plate can be painted after chromate oxidation treatment. This will clean the surface, significantly improve the adhesion of painting, and multiply the corrosion resistance. The process of cleaning is as below: clean the workpiece, hang the workpiece on the assembly line, go through the cleaning solution (alloy degreasing powder), the water, the spray area and the drying area, finally take out the workpiece from the assembly line.

Painting

After surface pretreatment is the painting. If the workpiece is assembled, we need to take actions the thread or conductive hole to protect from painting.

Protective treatment

Thread hole can plug into soft glue stick or screw, and paste high temperature tape for part needs conductive protection. Make a lot of positioning fixtures to locate, so that paint will not spray into the workpiece. The fixture protection can also be used for some mass produced workpieces.

When the workpiece need to be painted before assembly, the area that does not need to be painted shall be covered with high-temperature resistant tape and paper to cover, and the nut holes that exposed outside should be plugged with screws or high-temperature resistant rubber. If the workpiece needs to be painted on both sides, use the same method to protect the nut (stud) hole; for small workpieces, use wire or paper clip to put them together before painting; for workpiece with high surface requirement, do ash treatment before painting. The painting processes include hung on the workpiece to the assembly line, blow off the dust stuck on the surface by air gun, go into the painting area, then drying area along the assembly line, and finally take out the painted workpiece from the assembly line.

There are manual painting and automatic painting, and the applied fixture will be different.

Assembly

Before assembly, tear the protection stickers for painting. Make sure the thread holes are not painted. In the whole process, you must wear gloves to avoid dust on your hands attached to the workpiece, and some workpieces can be cleaned by air gun.

Packing

The workpiece should be inspected before putting into a special packaging bag for protection. For some workpieces without special packaging, they can apply bubble film. The bubble film can be cut into the size suitable for workpiece before packaging; For Large batch, they can use customized carton or bubble bag, plastic pad, pallet, wooden box and so on. After the workpieces are put into cartons, stick corresponding labels to identify.

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