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How To Polish Stainless Steel Pipe

Polishing refers to the machining method of using mechanical, chemical or electrochemical action to reduce the surface roughness of the stainless steel pipe, so as to obtain a bright and flat surface. It is to use polishing tools and abrasive particles or other polishing media to modify the surface of the stainless steel pipe.


Stainless steel pipe polishing is divided into two parts: inner surface polishing and outer surface polishing. Most of the stainless steel tube polishing is mechanical polishing, if the precision requires higher use of electropolishing.


Mechanical polishing: the polishing rod is extended into the pipe to drive the thousand impeller or self-made abrasive belt wheel to rotate at a high speed, and the polishing is carried out along with the rotation of the steel pipe itself. The polishing rod moves forward slowly while rotating. Mechanical polishing is to remove a very thin layer of metal on the grinding surface of the sample by grinding and rolling the very small polishing powder. If you think the mechanical polishing is not bright enough, you can apply polishing paste properly to increase the brightness.


Electropolishing: with the polished stainless steel pipes as the anode and insoluble metal as the cathode, the two poles are immersed in the electrolytic cell at the same time, and the selective anode dissolution is generated by direct current. The surface of the stainless steel pipe is gradually leveled, so as to achieve the effect of increasing the surface brightness of the stainless steel pipe.


After polishing, because the oxide layer on the surface is damaged, it is better to passivate the surface with acid solution, otherwise stainless steel pipe is easy to rust.


Polishing can not improve the dimensional or geometric accuracy of the stainless steel pipe, but for the purpose of obtaining smooth surface or specular gloss, sometimes it is also used to eliminate gloss (extinction). The polishing wheel is usually used as a polishing tool.


The polishing wheel is generally made of multi-layer canvas, felt or leather, and its two sides are clamped with metal circular plates. Its rim is coated with polishing agent which is uniformly mixed by micro powder abrasive and grease.


During polishing, the high-speed rotating polishing wheel (the peripheral speed is more than 20 m / s) presses the stainless steel pipe, so that the abrasive produces rolling and micro cutting on the stainless steel pipe surface, so as to obtain a bright machining surface, and the surface roughness can generally reach Ra0.63 ~ 0.01 μ M.

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