Wire Drawing Dies form one of the most crucial and vital part of the wire drawing industry. It is used to produce superior quality wires at the lowest possible die cost or wire ton drawn. For this only quality dies are desired. Poor die quality and improper selection will only add to both direct and indirect die cost through wire rejections resulting from poor surface finish, metallurgical properties, accuracy, consequent production loss and machine downtime. It is necessary to understand that die making and wire making are considered to be partnership for excellence. With due and proper attention being given to this particular strategic partnership, the wire industry can derive excellent die management.
Material for wire-drawing dies
To create such dies, there are readily available different types of materials in the market like synthetic diamond, natural diamond and T.C. (Tungsten Carbide). Each one is known to have its own application sphere. Diamond drawing dies is considered to be one of the best as it serves the purpose well. Almost all wires are stated to be either partially or fully (from certain size to wire rod based on the desired accuracy and material type) are drawn through the TC dies. This is because of their given below properties. To know more, log onto popular websites like https://www.szwiredie.com/!
- High hardness at high temperatures and room temperature encountered during drawing operations.
- Considered to be quite affordable when compared with all the three materials.
- It shares properties to maintain and receive superior surface finish of about 1 micro inch.
- Tiny thermal expansion coefficient. Hence, nano dies variation in size noticed is quite minimal resulting from rising working temperatures.
TC dies pellets and nibs are manufactured using powder metallurgy procedure using raw basic Tungsten Carbide material along with metallic binder Cobalt. In case of drawing operations, there will be required a nib that is resistance towards wearing and also tough enough to resist deformation especially under heavy load. Toughness and hardness of any given material are stated to be inversely proportional. Hence, the optimum combination of these two properties according to the application will be essential.
For this reason, there are available TC nibs in different grades. You can also get PCD dies of different types. T.C. found in varying grades tends to have hardness of about 1400-2000 on the HV 30 scale. Its corresponding traverse rupture strength is around 1700-2800 N/mm sq. This is the measurement that is currently manufactured to suit drawing operations. The different grades are said to be obtained through varying of the cobalt and Tungsten carbide grain size percentage. Hardness is found to increase with reducing cobalt content and grain size. Researching on PCD Drawing Dies can give better idea on this tool.
The very first step towards selecting quality die, be it PCD Wire Drawing Dies or another type will be to select proper nib grade, in consolation with the die manufacturer. Grade selection entirely is based on the wire material and size drawn combined with material condition.