In the process of the development of industrial products toward diversification and high-end, how to improve the quality of molds that directly affects the quality of products is an important task. In the manufacturing process of titanium alloy screw molds, the smooth processing and mirror processing after shape processing are called part surface grinding and polishing processing, and it is an important process to improve the quality of the mold. Mastering a reasonable polishing method can improve the quality and service life of titanium alloy screw molds, thereby improving product quality. Today, Shanghai Jinfu Titanium Editor has shared a complete and practical mold polishing information for titanium alloy screw powder, hoping to help titanium alloy screw powder!
Commonly used polishing methods and working principles
- 1. Mechanical polishing
Mechanical polishing is a method of polishing by cutting or plastically deforming the surface of the material to remove the protrusions on the surface of the workpiece to obtain a smooth surface. Generally, whetstone strips, wool wheels, sandpaper, etc. are used, which are mainly manual operations. Super fine grinding method. Super-precision grinding and polishing is the use of special grinding tools, in the grinding and polishing liquid containing abrasives, tightly pressed on the surface of the workpiece to be processed for high-speed rotation. The surface roughness of Ra0.008 μm can be achieved by this technology, which is the best surface roughness among various polishing methods. Optical lens molds often use this method. Mechanical polishing is the main method of mold polishing.
- 2. Chemical polishing
Chemical polishing is that the material in the chemical medium allows the microscopic convex part of the surface to preferentially dissolve than the concave part, so as to obtain a smooth surface. This method can polish workpieces with complex shapes, and can polish many workpieces simultaneously, with high efficiency. The surface roughness obtained by chemical polishing is generally Ra10 μm.
- 3. Electrolytic polishing
The basic principle of electrolytic polishing is the same as chemical polishing, that is, by selectively dissolving the tiny protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction, and the effect is better.
- 4. Ultrasonic polishing
Ultrasonic polishing is a processing method that uses the tool section for ultrasonic vibration to polish brittle and hard materials through abrasive suspension. Put the workpiece in the abrasive suspension and put it in the ultrasonic field together, relying on the oscillation of the ultrasonic wave to make the abrasive grinding and polishing on the surface of the workpiece. Ultrasonic processing has a small macro force and will not cause deformation of the workpiece, but tooling is difficult to make and install.
- 5. Fluid polishing
Fluid polishing is to rely on flowing liquid and abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Hydrodynamic grinding is driven by hydraulic pressure. The medium is mainly made of a special compound (polymer-like substance) that flows through at a lower pressure and is mixed with abrasive. The abrasive can be silicon carbide powder.
- 6. Magnetic grinding and polishing
Magnetic polishing is the use of magnetic abrasives to form abrasive brushes under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality and easy control of processing conditions. Using suitable abrasives, the processed surface roughness can reach Ra0.1 μm.
- 7. Electric spark ultrasonic compound polishing
In order to improve the polishing speed of the workpiece with a surface roughness Ra of 1.6 μm or more, ultrasonic polishing and a dedicated high-frequency narrow-pulse high-peak current pulse power supply are used for compound polishing. Ultrasonic vibration and electric pulse corrosion simultaneously act on the surface of the workpiece and rapidly reduce Its surface roughness is very effective for the rough surface of the mold after processing by turning, milling, EDM and wire cutting.