Mirror treatment means that the treated surface can reflect an image like a mirror. This level has achieved very good surface quality of the workpiece. Mirror processing can not only create a high “appearance” for the product, but also reduce the notch effect and prolong. fatigue of the workpiece; it is of great importance in many assembly and sealing structures. The polishing mirror processing process is mainly used to reduce the surface roughness of the workpiece. When choosing a polishing process method for metal parts, you can choose different methods according to different needs. Here are several common methods of processing mirror polishing.
1. Mechanical polishing. Mechanical polishing is a polishing method that relies on cutting and plastic deformation of the material surface to remove polished convex parts to obtain a smooth surface. Generally, oil stone strips, wool wheels, sandpaper, etc. are used. manual operations, special parts such as rotating For the body surface, auxiliary tools such as turntables can be used. For those with high demands on surface quality, ultra-precise grinding and polishing methods can be used. Super precision polishing uses special abrasives, which are pressed against the machined surface of the workpiece in a polishing fluid containing abrasives to rotate at high speed. This technology can achieve a surface roughness of Ra0.008 μm, which is the highest among different polishing methods. This method is often used for optical lens molds.
2. Chemical polishing Chemical polishing allows the convex microscopic parts of the material surface to be dissolved preferentially in the chemical medium than the concave parts, thus obtaining a smooth surface. The main advantage of this method is that it does not require complicated equipment, can polish workpieces with complex shapes, and can polish multiple workpieces at the same time, with high efficiency. The central problem in chemical polishing is the preparation of the polishing fluid. The surface roughness obtained by chemical polishing is generally several tens of µm.
3. Electrolytic Polishing The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, it relies on the selective dissolution of tiny protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, the influence of cathodic reaction can be eliminated and the effect is better. The electrochemical polishing process is divided into two stages: (1) The dissolved macro-leveling products diffuse into the electrolyte, and the geometric roughness of the material surface decreases, Ra>1 μm. (2) Low brightness flat anodic polarization, enhanced surface brightness, Ra <1 μm.
4. Haukeneng Mirror Processing Equipment
As a new polishing process, it has unique advantages in processing many types of metal parts. It can replace traditional grinding machines, rolling mills, boring rollers, sharpening machines, polishing machines, sand belt machines and other metal surface finishing treatment equipment and processes; Haukeneng can not only polish, but also bring many additional benefits: it can improve the surface finish of the workpiece by more than 3 levels (the Ra roughness value can easily reach below 0.2 and the surface microhardness of the room can be increased by ); more than 20%; and significantly improves the surface wear resistance and corrosion resistance of the workpiece. Hauke can be used to process various stainless steel parts and other metal parts.
5. Ultrasonic polishing places the workpiece in the abrasive slurry and places it in the ultrasonic field. Relying on the oscillation of ultrasonic waves, the abrasive grinds and polishes the surface of the workpiece. The macro force of ultrasonic processing is small and will not cause workpiece deformation, but the production and installation of tooling is difficult. Ultrasound treatment can be combined with chemical or electrochemical methods. Based on the corrosion and electrolysis of the solution, ultrasonic vibration is applied to stir the solution to separate the dissolved products from the workpiece surface and make the corrosion or electrolyte near the surface uniform. . The cavitation effect of ultrasonic waves in liquid can also be achieved; inhibits the corrosion process and facilitates surface brightening.
6. Fluid Polishing Fluid polishing relies on a high-velocity circulating liquid and the abrasive particles it carries to wash the surface of the workpiece to achieve the polishing objective. Commonly used methods include: abrasive jet machining, liquid jet machining, fluid grinding, etc. Hydraulic grinding is driven by hydraulic pressure, which causes the liquid medium carrying abrasive particles to reciprocate on the workpiece surface at high speed. The fluid mainly consists of special compounds (polymer-like substances) with good flow properties under relatively low pressure and mixed with abrasives. The abrasives may be silicon carbide powder.
7. Mirror Polishing Mirror polishing, magnetic grinding and polishing Magnetic grinding and polishing uses magnetic abrasives to form an abrasive brush under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality, easy control of processing conditions and good working conditions. By using suitable abrasives, the surface roughness can reach Ra0.1 μm. The polishing mentioned in plastic mold processing is very different from the surface polishing required in other industries. Strictly speaking, mold polishing should be called mirror processing. It imposes not only high demands on the polishing itself, but also high standards on the flatness, smoothness and geometric accuracy of the surface. Surface polishing generally only requires obtaining a shiny surface. The standard for mirror processing is divided into four levels: AO=Ra0.008μm, A1=Ra0.016μm, A3=Ra0.032μm, A4=Ra0.063μm. Due to electropolishing, fluid polishing and other methods, it is difficult to do so. precisely control the geometric accuracy of the parts. However, the surface quality of chemical polishing, ultrasonic polishing, magnetic grinding and polishing methods cannot meet the requirements, so the mirror processing of precision molds is still mainly based on mechanical polishing.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
