Tungsten has the highest melting point of all metals as well as a remarkably high modulus of elasticity. In general, its properties are similar to those of molybdenum. These two metals are located in the same group in the periodic table. However, some of the properties of tungsten are more pronounced than they are in molybdenum. Thanks to its outstanding thermal properties, tungsten can easily withstand even the most intense heat.
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We are able to influence the properties of our tungsten and its alloys by varying the type and quantity of alloying elements that we add as well as the production process we employ.
We primarily use doped tungsten materials. For WVM, we add small quantities of potassium. Potassium has a positive effect on the mechanical properties of tungsten, especially at high temperatures. The addition of La2O3 ensures a decrease of the electron work function along with better mechanical workability, making tungsten suitable for use as a cathode material.
We add rhenium in order to increase the ductility of our tungsten. Copper increases the material's electrical conductivity. Thanks to their good workability, you can also use our heavy metal alloys for complex geometries. They can be used as shielding material or as damping and absorption components, for example.
The choice of tool material in Electrical Discharge Machining (EDM) can have a significant impact on the process and the overall performance. Here are the effects of using different tool materials:
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1. #Copper: Copper is a commonly used tool material in EDM. It has good electrical conductivity, which allows for efficient energy transfer during the spark generation process. Copper tools are softer compared to other materials, which helps reduce the wear on the workpiece. However, due to their softness, copper tools can wear out faster and may require more frequent replacement.
2. #Tungsten: Tungsten is a hard and brittle material that is often used for EDM electrodes. It offers excellent heat resistance and can withstand high temperatures generated during the EDM process. Tungsten tools have a longer lifespan compared to copper tools but may be more prone to breakage due to their brittleness. They are suitable for machining hard and dense materials.
3. #Copper-Tungsten Alloy: Copper-tungsten alloy combines the advantages of both copper and tungsten. The alloy provides good electrical conductivity similar to copper and high strength similar to tungsten. Copper-tungsten tools have improved wear resistance and can withstand higher machining speeds compared to pure copper tools. This makes them suitable for applications where high material removal rates are required.
The choice of tool material depends on various factors such as the workpiece material, desired cutting speed, and surface finish requirements. It is important to consider the specific requirements of the EDM process and select the appropriate tool material accordingly.
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