Different Methods of Pressing Tungsten carbide rods

Tungsten carbide is known as one of the hardest materials, which is just less than diamond. To produce the tungsten carbide, workers have to press them into a certain shape. In manufacturing, there are three methods to press tungsten carbide powder into tungsten carbide rods. They have their advantages and applications.

The methods are:

1. Die Pressing 

2. Extrusion Pressing

3. Dry-bag Isostatic Pressing

1. Die Pressing

Die pressing is pressing the tungsten carbide rods with a die mold. This method is the most common and widely used one. During the die pressing, workers add some paraffin as a forming agent, which can increase efficiency, shorten producing time, and save more costs. And paraffin is easy to let out during the sintering. However, tungsten carbide rods after die pressing need to be ground.

2. Extrusion Pressing

Extrusion pressing can be used to press tungsten carbide bars. In this process, there are two kinds of forming agents used widely. One is cellulose, and the other one is paraffin. 

Using cellulose as forming agent can produce high-quality tungsten carbide bars. Tungsten carbide powder is pressed into a vacuum environment and then out continuously. But it takes a long time to dry the tungsten carbide bars before sintering. 

Using paraffin wax also has its characteristics. When the tungsten carbide bars are discharging, they are a hard body. So it doesn’t take a long time to dry. But the tungsten carbide bars produced with paraffin as its forming agent have a lower qualified rate.

3. Dry-bag Isostatic Pressing

Dry-bag isostatic pressing can also be used to press tungsten carbide bars, but only for those above 16mm diameter. Otherwise, it will be easy to break. During the dry-bag isostatic pressing, the forming pressure is high, and the pressing process is fast. Tungsten carbide bars after dry-bag isostatic pressing have to be ground before sintering. And then it can be sintered directly. In this process, the forming agent is always paraffin.

According to different cemented carbide products, factories will choose different methods to guarantee their efficiency and the high quality of tungsten carbide products.

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