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Large-diameter stainless steel pipe surface mechanical treatment

The mechanical treatment of large-diameter stainless steel pipes is to remove the corrosion products, oil stains, old paint film and daddy plugs on the metal and non-metal surfaces by mechanical force: the surface of the cohesive surface is facilitated by the construction of the subsequent process, and Ensure the firm adhesion and quality of the protective layer and extend the life of the product.


Brushing is the method of processing the surface of a workpiece using a brush wheel made of wire, animal hair, natural or man-made fibers. It is mainly used to remove scale, rust, welding slag, and other dirt from old paint on the surface of the workpiece; it is also used as a burr to remove parts and leave the edge of the surface after processing.


Large diameter stainless steel tube polished and polished


Polished. Polishing is the method of machining the surface of a part with a polishing wheel. It can remove defects such as rust, blisters, welding slag and scratches on the surface of the parts and improve the flatness of the parts. Polishing a ship is carried out on a machine equipped with a rotating grinding wheel or disc. At present, the use of belt sanders is increasing, and it can also be carried out in some special rotating drums, vibrating sanders, etc., the latter. Often used in mass production.


The buffing wheel is made by bonding abrasive particles to the elastic wheel with an adhesive. For parts with a hard surface and a clear outline, a harder grinding wheel (such as a felt wheel) should be used; for a softer and more complex part, a flexible wheel (such as a cloth wheel) should be used. When the buffing wheel rotates at a high speed (generally required to have a circumferential linear velocity of 10 to 30 m/s), the abrasive grains adhering to the surface serve as numerous single-knife cutting action.


Abrasives for polishing are selected according to the nature of the substrate and surface processing requirements. Commonly used abrasives are: synthetic diamond, corundum and silicon carbide. polishing. Polishing is the method of processing the surface of a part with a polishing wheel. Polishing further reduces the surface roughness of the part and gives a shiny appearance.


When polishing, first adjust the circumferential linear velocity of the polishing wheel to 20 ~ 35m / s (the shape of the part is simple, the surface is hard, the rotation speed can be larger; otherwise, the smaller), and then according to the material of the part to be thrown, select the appropriate Polishing agent.


Large diameter stainless steel pipe is sandblasted and shot blasted, sandblasted. Sand blasting is to use a compressed air stream to spray sand on the surface of the part to remove the scale, rust, silk, plastic, squid, fish, squid, squid, squid, squid, and other special requirements. The bonding force between the two layers and the base metal. For sand blasting, the abrasive used may be steel sand, alumina, quartz sand, silicon carbide or the like. Quartz sand is currently the most widely used, and the size of the sand used should be based on the material of the part, the surface condition and the processing requirements. Wet blasting, mixing abrasive and water into mortar (abrasive volume generally accounts for 20% to 30%), and constantly stirring to prevent precipitation, using compressed air into the spray gun, spraying to the workpiece; sand and water can also be placed separately In the tank, mix before the spray gun and then spray it toward the workpiece. In order to prevent corrosion of steel parts, NaN03, Na2 C03, Na2 Cr2 03 and other antimony corrosion inhibitors may be added to the water. The abrasive used for wet blasting is the same as dry blasting. The advantages of sand blasting are low cost, high production efficiency and simple operation. The disadvantage is that a large amount of dust is generated and the abrasive loss is large.


Shot peening. Shot peening is similar to sandblasting, except that steel shots or glass shots are used instead of abrasives for sandblasting. Commonly used shot peening mainly has the following types: cast steel shot, hardness is generally HRC 40 ~ 50, good toughness, widely used, its service life is several times that of cast iron. Cast iron pill, hardness HRC 58 ~ 65, brittle and easy to break, ‘short life, not widely used. Mainly used in occasions where high shot peening is required. The particle size of shot peening is generally between 6 and 50 mesh. The blasting equipment is basically the same as the blasting equipment, except that some auxiliary equipment is needed to control the blasting process more strictly.


Shot peening has many advantages over sandblasting. The equipment has high productivity, good surface quality and less abrasive loss.




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