In the process of industrial products to diversification, high-grade development, how to improve the quality of moulds that directly affect product quality is an important task. In the titanium alloy screw mould manufacturing process, shape processing after the smooth processing and mirror processing called parts surface grinding and polishing processing, it is to improve the quality of the mould is an important process. Mastering reasonable polishing methods can improve the quality and service life of titanium alloy screw moulds, and thus improve product quality.
- Mechanical polishing
Mechanical polishing is to rely on cutting or plastic deformation of the material surface to remove the workpiece surface protruding part of the smooth surface of the polishing method, generally using oil stone strips, wool wheels, sandpaper, etc., mainly by hand, the surface quality of the requirements of the high surface can be used to ultra-precision research and polishing methods. Ultra-precision grinding and polishing is the use of special abrasives, containing abrasives in the research and polishing liquid, tight pressure on the surface of the workpiece being processed, for high-speed rotary motion. The surface roughness of Ra0.008 μm can be achieved by this technique, which is the best surface roughness among various polishing methods. Optical lens moulds often use this method. Mechanical polishing is the main method of mould polishing.
- Chemical polishing
Chemical polishing is the material in the chemical medium so that the microscopic convex part of the surface is preferentially dissolved over the concave part, thus obtaining a smooth surface. This method can polish workpieces with complex shapes, and can polish many workpieces at the same time with high efficiency. The surface roughness obtained by chemical polishing is generally Ra10 μm.
- Electrolytic Polishing
The basic principle of electrolytic polishing is the same as that of chemical polishing, i.e., it relies on the selective dissolution of tiny protruding parts on the surface of the material to make the surface smooth. Compared with chemical polishing, it eliminates the influence of cathodic reaction and gives better results.
- Ultrasonic polishing
Ultrasonic polishing is the use of tool sections for ultrasonic vibration, through the abrasive suspension polishing brittle hard materials, a processing method. The workpiece is put into the abrasive suspension and placed together in the ultrasonic field, relying on the oscillation of ultrasonic waves, so that the abrasive grinding and polishing on the surface of the workpiece. Ultrasonic processing macro force is small, will not cause deformation of the workpiece, but the production and installation of tooling is more difficult.
- Fluid polishing
Fluid polishing is to rely on the flow of liquid and the abrasive particles it carries to flush the surface of the workpiece to achieve the purpose of polishing. Fluid power polishing is driven by hydraulic pressure, the media is mainly used in the lower pressure flow through the good special compounds (polymer-like substances) and mixed with abrasives made of abrasive can be used silicon carbide powder.
- Magnetic grinding and polishing
Magnetic grinding and polishing is the use of magnetic abrasives in the magnetic field under the action of the formation of abrasive brushes, grinding and processing of the workpiece. This method has high processing efficiency and good quality, and the processing conditions are easy to control. With suitable abrasives, the processed surface roughness can reach Ra0.1 μm.
- EDM ultrasonic compound polishing
In order to improve the surface roughness Ra for more than 1.6 μm workpiece polishing speed, the use of ultrasonic and special high-frequency narrow pulse high peak current pulse power supply for composite polishing, by the ultrasonic vibration and the corrosion of the electric pulse at the same time on the surface of the workpiece, to rapidly reduce its surface roughness, which is processed by the car, milling, EDM and wire-cutting process of rough surface polishing of the moulds and so on, the effect is obvious, very effective.
