At present, there are many kinds of polishing processes for stainless steel pipe fittings. This paper introduces some common polishing processes, including mechanical polishing, chemical polishing, electropolishing, ultrasonic polishing, fluid polishing, etc..
Mechanical polishing on cutting and plastic deformation of plate surface is convex removed after polishing to obtain a smooth surface polishing method, usually use oilstone, wool wheel, sand paper, these are mainly manual operation, including special parts such as rotary surface, can be used to machine tool, if higher requirements on the surface quality, you can use the method of ultra precision polishing. Ultra precision polishing is the use of special abrasive tools, in the grinding fluid containing abrasives, tightly pressed on the surface of the pipe to be processed, for high-speed rotation movement. Using this technique, the surface roughness of Ra0.008 micron M can be reached, which is the highest in various polishing methods.
Chemical polishing is to dissolve the micro protruding part of the stainless steel tube surface in chemical medium to obtain smooth surface. The main advantage of this method is that the complex shape of the pipe can be polished without complex equipment, and many pipes can be polished at the same time, and the efficiency is very high. The key of chemical polishing is the preparation of polishing fluid. The surface roughness obtained by chemical polishing is generally 10 m.
The basic principle of electropolishing is the same as chemical polishing, which relies on selective dissolution of tiny bulges on the surface of stainless steel to obtain smooth surfaces. Compared with chemical polishing, the effect of cathodic reaction can be eliminated, and the effect is better.
The stainless steel pipe is placed in the abrasive suspension and placed in the ultrasonic field together, and the surface of the pipe is polished by the oscillating action of the ultrasonic wave. Ultrasonic machining has small macro force and can not cause deformation of pipe fittings, but it is difficult to make and install tooling. Ultrasonic machining can be combined with chemical or electrochemical methods. Based on the solution of corrosion, electrolysis, and ultrasonic vibration is applied to dissolving the mixing solution, the surface of the pipe from near the surface of the product, corrosion or electrolyte evenly; ultrasonic cavitation in the liquid can also inhibit the corrosion process for surface light lighting.
Fluid polishing is based on high speed flow of liquid and its abrasive particles to scour the pipe surface to achieve polishing purposes. Commonly used methods are: abrasive jet machining, liquid jet machining, fluid dynamic grinding, etc.. Fluid dynamic grinding is driven by hydraulic pressure, which allows the liquid medium carrying abrasive particles to flow through the pipe surface at high speed. The medium is mainly made of special compound (polymer material) which is flowing through the lower pressure and mixed with abrasive. The silicon carbide powder can be used in the abrasive.
Source: China Stainless Steel Pipe Fittings Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)