What is the principle of electrical discharge machining for tungsten carbide parts?

Due to the high hardness of tungsten steel, it cannot be machined by general lathes or milling machines, and therefore spark machining is required. The principle of electrical discharge is based on electro-erosion, which involves directly opposing positive and negative polarities to erode away the excess tungsten steel. Below, tungsten steel parts manufacturer Kunshan Feiya will explain the principle of electrical discharge machining for tungsten steel parts.

1. Workpieces processed by electrical discharge machining typically fall into two categories: one is circular. This type of product is relatively easier to machine. As the current passes through the electrode, it is evenly distributed in all directions. During the machining process, attention should be given to the coordination between the current size and the surface finish. The rougher the surface finish of the tungsten steel, the higher the current; conversely, a lower current results in a better surface finish.

2. During the electrospark machining of tungsten carbide irregular workpieces, since the current still emits from the center of the electrode in a 360-degree direction, some surfaces may experience excessive current while others may have insufficient current. On surfaces with excessive current, it is prone to the formation of pits, which are local corrosion of tungsten carbide caused by intense instantaneous current. To avoid this, the use of electrospark machines with added oscillating heads can be adopted. By oscillating the head after a certain period of machining, the effect is relatively improved.

Tungsten Carbide Parts Machining

When welding tungsten steel, pay attention to the following points:

1. Tungsten steel is a sintered product formed through powder metallurgy, inherently possessing hardness. During welding, it is best to avoid directly burning the tungsten steel with fire, as this can easily cause cracking.

2. Tungsten steel can be焊接 using silver solder to avoid excessive heating. Silver has a lower melting point than copper, thus reducing the need for tungsten steel to be heated.

3. In cold-weather regions, after welding tungsten steel products, they are insulated with quicklime to maintain temperature. During the welding process, the tungsten steel is heated intensely. Once the heating stops, the tungsten steel is re-exposed to cold temperatures, leading to cracking.

4. To ensure a robust weld for tungsten steel, it's advisable to first apply some flux.

Kunshan Feiya Precision Mold Co., Ltd., established in 2004, specializes in injection mold design, stamping continuous molds, two-color molds, stamping spring molds, connector injection molds, tungsten carbide parts processing, and more. We are proficient in the new technologies of insert injection molds and connector injection molds. As a member of Kunshan Cross-border E-commerce Council, we look forward to your call for cooperation.