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, which are important processes to improve the quality of the mold.

Mastering reasonable polishing methods can improve the quality and service life of titanium alloy screw molds, thereby improving product quality. Today, the editor will share a comprehensive practical mold polishing knowledge with titanium alloy screw powder, hoping to be helpful to titanium alloy screw powder!

Common polishing methods and working principles

1. Mechanical polishing

Mechanical polishing is a polishing method that removes the protruding parts of the workpiece surface by cutting or causing plastic deformation on the material surface to obtain a smooth surface. It generally uses oilstone strips, wool wheels, sandpaper, etc., and is mainly manually operated. For surfaces with high quality requirements, ultra precision polishing can be used. Ultra precision polishing is the use of specially designed grinding tools, which are tightly pressed onto the machined surface of the workpiece in a polishing fluid containing abrasives and perform high-speed rotational motion. By utilizing this technology, Ra0.008 can be achieved μ The surface roughness of m is the best among various polishing methods. This method is often used in optical lens molds. Mechanical polishing is the main method of mold polishing.

2. Chemical polishing

Chemical polishing is the process in which a material preferentially dissolves the micro protruding parts of the surface in a chemical medium, resulting in a smooth surface. This method can polish workpieces with complex shapes and can simultaneously polish many workpieces with high efficiency. The surface roughness obtained by chemical polishing is generally Ra10 μ M.

3. Electrolytic polishing

The basic principle of electrolytic polishing is the same as that of chemical polishing, which involves selectively dissolving small protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathodic reactions and has a better effect.

4. Ultrasonic polishing

Ultrasonic polishing is a machining method that uses tool cross-section for ultrasonic vibration to polish brittle and hard materials through abrasive suspension. Place the workpiece in an abrasive suspension and place it together in an ultrasonic field, relying on the oscillation effect of the ultrasonic wave to grind and polish the abrasive on the surface of the workpiece. Ultrasonic machining has low macroscopic force and will not cause deformation of the workpiece, but it is difficult to make and install tooling.

5. Fluid polishing

Fluid polishing is achieved by flushing the surface of a workpiece with flowing liquid and its carried abrasive particles. Hydrodynamic grinding is driven by hydraulic pressure, and the medium is mainly made of special compounds (polymer like substances) with good flowability at lower pressures and mixed with abrasives. The abrasives can be silicon carbide powder.

6. Magnetic grinding and polishing

Magnetic abrasive polishing is the use of magnetic abrasives to form abrasive brushes under the action of a magnetic field, which grind and process workpieces. This method has high processing efficiency, good quality, and easy control of processing conditions. By using appropriate abrasives, the surface roughness of the processed material can reach Ra0.1 μ M.

7. Electric spark ultrasonic composite polishing

In order to improve the surface roughness Ra to 1.6 μ The polishing speed of workpieces above m is achieved by composite polishing using ultrasonic waves and a dedicated high-frequency narrow pulse peak current pulse power supply. The corrosion of ultrasonic vibration and electric pulses simultaneously acts on the surface of the workpiece, rapidly reducing its surface roughness. This has a significant and effective polishing effect on the rough surface of the mold processed by processes such as turning, milling, electric discharge, and wire cutting.