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What Are the Polishing Techniques for Mold?

Source: Junying   Author: Junying   Posted: 2017-02-22 10:00:47   Hits: 56
Nowadays, in the process of diversification and precision development of machined products, improving the quality of mold has become an important task. In the mold manufacturing process, The treatment of surface grinding and polishing for the processed parts have become an important process to improve the quality of the mold. The reasonable use of polishing method for improving the quality of the mold and the service life are of great help. So what are the commonly used polishing methods?

The commonly used polishing methods

1. Mechanical Polishing 
Mold polishing is a method that removes the protruding part on the workpiece surface by the cutting or plastic deformation of the surface. The most commonly used subject is honing stone, wool wheel, sandpaper, etc. They are mainly operated by hands. And we can use super grinding method for those with good surface. The principle of Ultra-fine grinding is that using a special abrasive tool dose rotary motion on the surface of machining workpiece in the polishing liquid containing abrasive.

2. Chemical Polishing 
The basic principle of chemical polishing is that the material of the chemical medium dissolve the surface of the micro-protruding part faster than the concave part, and get a smooth surface. This method not only has a good polishing effect for the complex shape of the workpiece, but also can finish the polishing for several workpiece and has a very high efficiency.

3. Electrolytic Polishing 
The basic principle of electrolytic polishing is similar to chemical polishing, which uses dissolved materials to dissolve the micro-protruding part of the workpiece in order to achieve the smooth surface. Compared with chemical polishing, it has a very good effect to eliminate the cathode reaction.

4. Ultrasonic Polishing 
Ultrasonic polishing is a processing method that utilizes tool section for ultrasonic vibration and the abrasive suspension liquid to polish hard and brittle materials. The workpiece with abrasive suspension liquid was put in the ultrasonic field, the abrasive grind and polish on the surface of the workpiece by the oscillating effect of the ultrasonic wave. Ultrasonic processing has a small force, it will not cause deformation of the workpiece, but the advantage is that the production and installation of tooling are difficult.
5. Fluid Polishing 
Fluid polishing mainly relies on the flow of liquid and the abrasive particles to scour the surface of the workpiece to achieve polishing. Fluid power grinding is driven by hydraulic, medium is usually the special compounds which can be used in the low pressure mixed with abrasive, and we can use silicon carbide powder as abrasive.

6. Magnetic Abrasive Polishing
Magnetic abrasive polishing mainly uses the magnetic field to form a abrasive brush, then grind the workpiece surface. This method has the benefits of high processing efficiency and good quality, and the processing conditions are relatively easy to control.

7. Ultrasonic EDM Compound Polishing
In order to improve the surface polishing speed, we can adopt compound polishing method to polish the surface of the workpiece. Ultrasonic vibration and electrical corrosion work on the surface of the workpiece at the same time, and quickly reduce the roughness of the surface, which have an obvious influence.