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What are the common methods of polishing stainless steel?
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Currently used stainless steel polishing methods are the following:
1 mechanical polishing
Mechanical polishing is by cutting, plastic deformation of the material surface to remove the convex portion after polishing to obtain a smooth surface of the polishing method, the general use whetstone, wool wheel, sandpaper, mainly to manual operation, special parts such as the surface of the rotor can be Use of turntables and other auxiliary tools, surface quality requirements can be super-precision polishing method. Ultra-precision polishing is the use of special abrasive, grinding fluid containing abrasive polishing press on the workpiece surface, for high-speed rotary motion. The surface roughness Ra0.008μm can be achieved by this technique, which is the highest among the various polishing methods. Optical lens mold often use this method.
2 chemical polishing
Chemical polishing is the material in the chemical surface of the micro-convex part of the concave portion preferentially dissolved, resulting in a smooth surface. The main advantage of this method is the high efficiency without the need for complex equipment, the ability to polish workpieces with complex shapes, the ability to polish many workpieces simultaneously. The core problem of chemical polishing is the preparation of polishing solution. The surface roughness obtained by chemical polishing is generally 10 μm.
A stainless steel chemical polishing method, sulfuric acid as a carrier, with sodium chloride, sodium fluoride (or potassium fluoride), sodium nitrate instead of the corresponding acid, the first salt dissolved in starch-soluble aqueous solution, the The stainless steel to be polished is soaked in this solution that the surface is coated with a layer of starch that is soluble in the salt, and then the material to be polished is immersed in a sulfuric acid solution and chemically polished in a suitable temperature range, Under the solution, when the solution appears green, the polishing process is completed. The invention does not generate acid mist, improves the working environment and reduces the production cost. The invention has practicality and economic value and is suitable for etching of steel devices.
The stainless steel chemical polishing method is characterized in that the stainless steel chemical polishing method comprises the following steps of: (1) mixing NaCl, NaF, KF or a mixture thereof, NaNO ↓ , starch and water in a weight ratio of NaCl, NaF, KF or any mixture thereof: NaNO ↓ : starch: water = 1: 2 to 4: 2 to 3: 65-200 and heating and dissolving to obtain solution A; (2) Sodium salicylate, hexamethylenetetramine, sulfuric acid, phosphoric acid and water are sodium sulfosalicylate: hexamethylenetetramine: sulfuric acid: phosphoric acid: water = 1: 1: 500-3000: -100: 2000 ~ 4500 mixed to prepare a solution B; (3) the stainless steel material to be polished is immersed in A solution for 5-15 minutes, removed and immersed in the B solution and heated at a temperature of less than 85 ° C for 5-20 minutes , Rinse the surface with water after removing the material.
3 electrolytic polishing
The basic principle of electrolytic polishing and chemical polishing the same, that is, by selective dissolution of the surface of the material slightly convex part of the surface smooth. Compared with chemical polishing, you can eliminate the impact of the cathode reaction, the effect is better. Electrochemical polishing process is divided into two steps:
(1) macroscopically leveled lysate diffusion into the electrolyte, the geometric roughness of the material surface decreased, Ra> 1μm. (2) Low-level flat anode polarization, surface brightness increased, Ra <1μm.
4 ultrasonic polishing
The workpiece into the abrasive suspension and placed together in the ultrasonic field, depending on the role of ultrasonic oscillation, so that the abrasive surface grinding and polishing. Ultrasonic machining macro force is small, will not cause deformation of the workpiece, but the tooling and installation more difficult. Ultrasonic machining can be combined with chemical or electrochemical methods. In the solution of corrosion, electrolysis, based on the application of ultrasonic vibration stirring solution, so that the workpiece surface dissolution products from the surface near the corrosion or electrolyte uniformity; ultrasonic cavitation in the liquid can also inhibit the corrosion process, which will help surface light.
5 fluid polishing
Fluid polishing is to rely on the high-speed flow of liquid and abrasive particles scour the surface of the workpiece to achieve the purpose of polishing. Common methods are: abrasive spray processing, liquid jet processing, fluid power grinding and so on. Hydrodynamic grinding is driven hydraulically, allowing the abrasive medium to flow back and forth through the workpiece surface at high speeds. The medium is mainly made of a special compound (polymer-like material) that flows well at lower pressure and is doped with an abrasive, and the silicon carbide powder can be used as the abrasive.
6 magnetic polishing
Magnetic polishing is the use of magnetic abrasive in the magnetic field to form abrasive brush, the workpiece grinding. This method of processing efficiency, good quality, easy processing conditions, good working conditions. With a suitable abrasive, the surface roughness can reach Ra0.1μm.