Views: 17 Author: Site Editor Publish Time: 2020-10-29 Origin: Site
Cemented carbide die is a kind of alloy material made of hard compound of refractory metal and binding metal through powder metallurgy process. The hardness of cemented carbide is very high, so pay attention to the method when polishing the cemented carbide die.
The polish of the powder metallurgy mould
The polish of the tungsten carbide die and carbide punch dies
There is still a wide range of polishing methods for powder metallurgy molds by manual operation. The main tools used are brush, file, scraper, etc. However, manual operation has two disadvantages, one is that the quality of polishing is difficult to control, judging by the operation experience, the other is that the production efficiency is not high, only one product can be processed at a time, the labor intensity is large, the production cost is high, it is difficult to achieve large-scale production.
In addition to manual polishing, there is also mechanical polishing, which is more convenient than manual polishing.
The rotating brush drives the workpiece to rotate. During the rolling process, the brush loads the burrs on the workpiece and makes the burrs fall off, so as to achieve the purpose of polishing the powder metallurgy mould. Reasonable selection of brush material and rotation speed and other parameters, can be processed with different powder metallurgy die.
Finishing machine is mainly divided into vibration finishing machine, centrifugal light decoration machine, magnetic light decoration machine, flow finishing machine, roller light decoration machine, which vibration finishing machine, roller light decoration machine has been widely used in powder metallurgy die polishing industry.
Sand blasting is to use compressed air as the power to form a high-speed jet beam, the high-speed jet to the powder metallurgy mold to be treated, the use of abrasive impact on the powder metallurgy mold surface and cutting action, so that the surface of the carbide die to obtain a certain degree of cleanliness and different roughness, to improve the mechanical properties of the carbide die surface.
The principle is that the powder metallurgy mould to be polished is placed in a sealed container with sufficient strength, and then fed into a certain proportion of pre-mixed combustible gas, which is ignited by the spark plug to produce an instant high temperature to remove the burrs on the carbide die surface. The polishing effect of this method is good, it will not affect the organization of parts, it is applicable to a wide range, but the cost is relatively high.
The convex part of tungsten carbide die and carbide punch die in the chemical medium can be dissolved in preference to obtain a smooth surface. Complex shapes can be polished without complex equipment, and many pieces can be polished at the same time.
The same basic principle as chemical polishing, by the selective dissolution of the tungsten carbide die and carbide punch die surface of the small projections, smooth the surface. Compared with chemical polishing, the cathode reaction can be eliminated and the effect is better.
The carbide die is put into the abrasive suspension and placed in the ultrasonic field together, and the abrasive is ground and polished on the surface of the carbide die by the vibration of the ultrasonic wave. This method will not cause deformation of the cemented carbide, but it is difficult to manufacture and install tooling.
Fluid polishing is driven by hydraulic pressure, so that the liquid medium carrying abrasive particles flows back and forth across the surface of the carbide die at high speed to achieve the purpose of polishing.
Magnetic abrasives are used to form abrasive brushes under the action of a magnetic field to grind the tungsten carbide die and carbide punch die.
The mold determines the forming of a part. For the accuracy of the part, the polishing of the carbide die is very important.
