The common processes to form tungsten rod are swaging and continuous rolling. Rotary swaging is a hammering process to forge rods. The sintered tungsten billets need to be heated to 1400 – 1600°C in a hydrogen atmosphere and then deformed to a rod shape by rotary forging on different types of swaging machines. Continuous rolling by Y type triple rolls mill is a more advanced process than swaging since it has a higher production efficiency and help tungsten rod has a better homogeneous microstructure.
Tungsten Rod Cutting and Sawing
Tungsten Carbide Cutting Tools
Tungsten Carbide blade is a very common tool used to cut tungsten rod and other working pieces which have high hardness and strength like tungsten. The typical grades of cemented carbide blades to cut tungsten rod are YG6, YG8, YS2 (YG10H), 726.
CBN Cutting Tools
CBN (Cubic Boron Nitride) material is another good choice when it comes to the materials suitable for tungsten machining work. The main CBN cutting tools are CBN turning inserts and grinding wheels. Compared to Tungsten carbide, CBN has a cutting speed three times faster and is twice as wearable.
Cutting Edge Angle
A 45° rake angle (KAPR) is the recommended cutting angle between the tungsten rod and the edge of the insert. This is because the tungsten rod and billet are usually formed by sintering and often brittle due to its large grain size. A correctly applied cutting angle in the cutting and turning can efficiently avoid the edge and surface from being cracked or layered.
In order to prevent the tool used to cut tungsten rod from wearing down, the feed rate needs to be gradually reduced while the insert is entering or exiting the tungsten working piece.
CHEMETAL USA is a leading tungsten supplier and manufacturer in worldwide. Please check our tungsten rod to learn more information about tungsten rod products.