The polishing treatment on stainless steel tube

The polishing treatment of stainless steel tubes is actually a surface grinding process, through the instrument and stainless steel tube surface friction to obtain a bright surface. Stainless steel tube outside polishing is used to cut the surface with different coarse particle size linen wheel to obtain the bright surface, and the internal polishing is in the stainless steel tube inside the reciprocating or selective movement of the internal grinding with plastic grinding head. It is worth noting that polishing can not improve the original machining accuracy but only change the surface flatness, the surface roughness value of polished stainless steel tube can reach 1.6-0.008um. According to the processing process, can be divided into mechanical abandonment and chemical polishing.

 

Mechanical polishing

Wheel polishing: The use of the flexible polishing wheel and fine abrasive on the surface of the steel pipe roll and micro-cutting to achieve the polishing process. The polishing wheel is made of overlapping layers of canvas, felt or leather, used for polishing large workpieces.

Roller polishing and vibration polishing is to put the workpiece, abrasive and polishing fluid into the drum or vibration box, the drum slowly rolling or vibration box vibration makes the workpiece and abrasive friction, polishing liquid chemical reaction can remove the steel pipe surface stains, corrosion, and burr to obtain a smooth surface. It’s suitable for large workpieces. The grinding resistance is related to the grinding machinery, the rigidity of the workpiece, and also has a relationship with the grinding vibration amplitude or grinding temperature, which affects the life of the grinding tool and the character of the grinding surface. The grinding temperature will cause the thermal deformation of the workpiece, reduce the dimensional accuracy, and also affect the processing metamorphic layer of the grinding surface.

Chemical polishing

The stainless steel tube is immersed in a special chemical solution. The phenomenon that the raised part of the metal surface dissolves faster than the concave part is used to achieve the process of polishing.

Chemical polishing is less investment, fast speed, high efficiency, good corrosion resistance; However, there are also brightness differences, gas overflow needs ventilation equipment, heating difficulties, suitable for complex parts and small parts of the light intensity requirements are not high products.

Electrolytic polishing

Electrolytic anode polishing on stainless steel tube is the process insoluble metal as the cathode, the poles into the electrochemical trough at the same time, through direct current (dc) and selective anodic dissolution, so stainless steel tube surface to achieve high brightness and luster appearance, and form – a sticky film on the surface, enhance the corrosion resistance of the pipe, applicable to occasions with higher requirements for surface quality.

Mirror polishing

Stainless steel mirror processing is actually a kind of polishing process, to the stainless steel pipe through the grinder counterclockwise rotation, correction wheel drive workpiece rotation, pressure on the pipe in the way of gravity pressure, In the matching grinding emulsion (mainly metal oxide, inorganic acid, organic lubricant and weak alkaline cleaning agent melt), stainless steel decorative tube and grinding disk for relative operation friction to achieve the purpose of grinding and polishing. The grade of polishing is divided into ordinary polishing, 6K, 8K, 10K, of which 8K grinding has been widely used because of the low process cost.