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Mechanical surface treatment
Source: | Author:hkw5c3f95 | Published time: 2018-08-01 | 484 Views | Share:
In the process of mechanical production and processing, a variety of surface treatment process, can meet our mechanical parts, product performance requirements, then what are the different methods of surface treatment?
Common surface treatment processes are: spraying, painting, electroplating, anodizing, infiltration, oil spraying, sandblasting.
Spraying: Applying paint or powder to the surface of a workpiece by means of pressure or electrostatic force to make the workpiece anticorrosive and decorative.
Baking Paint: Primer and topcoat on the substrate. Each time you apply the paint, it is sent to a dustless baking room and baked.
Electroplating: the process of attaching a metal film on the surface of a metal or other material by electrolysis. It can prevent corrosion, improve wear resistance, electrical conductivity, light reflection and improve appearance.
Anodization: electrochemical oxidation of metals or alloys. Using metal or alloy parts as anode, electrolysis is used to form oxide film on the surface. Metal oxide films change the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, protecting metal surface, etc.
Infiltration: a microporous (SLIT) osmosis sealing process. Sealing medium (usually low viscosity liquid) is infiltrated into the micro-pore (slit) by natural infiltration (i.e. micro-pore self-suction), vacuum and pressure, filling the crack, and then solidifying the sealing medium in the crack by natural (room temperature), cooling or heating methods to achieve the effect of sealing the crack.
Fuel injection: spray paint onto the surface of the product and dry it naturally.
Sandblasting: The use of compressed air as the power to form a high-speed jet beam will be sprayed (copper ore, quartz sand, diamond, iron sand, sea sand) high-speed jet to the surface of the workpiece to be processed, so that the surface of the workpiece surface appearance or shape changes, due to the impact of abrasive on the surface of the workpiece and cutting effect, so that the workpiece The mechanical properties of the workpiece surface are improved by obtaining certain cleanliness and different roughness of the surface, so the fatigue resistance of the workpiece is improved, the adhesion between the workpiece and the coating is increased, the durability of the coating is prolonged, and the leveling and decoration of the coating is also beneficial.
Items before surface treatment
Polishing: The use of flexible polishing tools and abrasive particles or other polishing media to modify the surface of the workpiece. Polishing can not improve the dimensional or geometrical accuracy of the workpiece, but to obtain a smooth surface or mirror gloss for the purpose, and sometimes also to eliminate gloss (matting). Polishing wheels are usually used as polishing tools. The polishing wheel is usually made of multi-layer canvas, felt or leather, and clamped by metal circular plates on both sides. The rim of the polishing wheel is coated with polishing agent which is evenly mixed by fine abrasive and grease. When polishing, a high-speed rotating polishing wheel (the circumferential velocity is more than 20 meters/sec) is pressed on the workpiece, so that the abrasive can roll and micro-cut the surface of the workpiece to obtain a bright machining surface, the surface roughness can generally reach Ra 0.63-0.01 micron; when the non-greasy polishing agent is used, the bright surface can be extincted. Improve appearance. Roller polishing is often adopted when the surface requirements are slightly lower. A large number of abrasives and products are placed in the tank drum during rough polishing. When the drum rotates, the products and abrasives are randomly rolled and collided in the drum to remove the surface bump and reduce the surface roughness.
Shot blasting: the use of shot blasting, centrifugal force projection, high-speed projection on the surface of the workpiece, especially on the inner cavity dead angle of the workpiece shot blasting cleaning, so as to achieve the required brightness, cleanliness, roughness and strengthen the surface of the workpiece, greatly improving the service life of the parts and aesthetics.
Ultrasonic cleaning is the use of ultrasonic cavitation in the liquid, acceleration and direct inflow on the liquid and dirt directly and indirectly, so that the dirt layer is dispersed, emulsified, peeled to achieve the purpose of cleaning.
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