The faucet production process consists of four major parts, one is casting, the other is machining, the third is surface treatment, and the fourth is assembly.
The first is the main casting, the process is mold design and production, sand core production, gravity casting, casting sand falling cleaning, nozzle cutting, casting surface cleaning.
The second is mechanical processing: After the copper castings are annealed, various machining operations are performed on the workpiece by CNC machine tools such as turning, milling, drilling, planing, grinding, boring, etc., so that the workpiece achieves the required dimensional accuracy and shape position accuracy and meets the pattern. Claim.
After the machining is completed, the product is polished to remove the surface burrs, rough surfaces and potholes, so that the surface of the product has no obvious blisters or stomata defects. After the polishing is completed, the polishing process is carried out, and the surface of the workpiece is ground by the high-speed rotation of the hemp cloth, which makes it smooth and bright, increases the brightness and smoothness of the product, makes the surface smooth and bright, and the lines are smoother and smoother.
The third is surface treatment. After the casting is polished and polished, the surface treatment of the casting is processed. The surface treatment process mainly includes PVD (Physical Vapor Deposition), ORB (Oil Rubber Bronze), plating Plating, etc. The most widely used faucet is electroplating chromium. Electroplating can enhance the corrosion resistance of the faucet, increase the hardness, prevent wear and increase the appearance of the surface. The most common type of electroplating is hexavalent chromium plating, and now environmentally friendly trivalent chromium plating is on the rise. Electroplating can be divided into three layers, the first layer of surface coated with acid copper, then nickel plated and the outermost layer of chrome. The thickness of the faucet plating is usually 8-12 microns.
The quality of the plating surface treatment can be judged by the 24-hour acetate spray test, and the coating thickness gauge can be used to identify the thickness of each metal coating. Generally speaking, the thickness of the coating is up to standard and the salt spray test can pass. Electroplating is a process of pollution and energy consumption. The general faucet production factory must hand the faucet to a professional electroplating factory for electroplating, thereby increasing production time and control.
For faucets that are directly connected to drinking water, lead plating is performed after plating to remove lead from the surface of the faucet that directly supplies drinking water. After two-stage washing, water washing, chemical degreasing, alkaline lead removal and acid lead removal, the product meets the requirements of the US NSF61, and the lead content is below 8‰, making the product more conducive to human health.