Principle and process of wire drawing
Wire drawing is a kind of metal processing technology in metal pressure machining. Under the action of external force, the metal is forced to pass through the mold, the cross-sectional area of the metal is compressed, and the required cross-sectional area shape and size are obtained.
The size of the tool is called the drawing die. For example, in the cable industry, an 8mm copper rod is drawn into copper wire by a set of (5-8) large-scale drawing dies, such as 3.5mm, 2.0mm, etc.
Under the traction of the wire drawing machine, the wire rod or intermediate wire blank deforms through the die hole of the drawing die, so as to reduce the cross-section and change the shape, so as to obtain the steel wire whose size, shape, performance and surface quality meet the requirements. The dies used for drawing steel wire mainly include fixed die, roll die (see roller die drawing), rotary die, etc., and the fixed die is the main one.
During the process of copper wire cold drawing, the microstructure and mechanical properties of steel wire change, resulting in work hardening. With the increase of cold deformation degree, the tensile strength, hardness, and elastic limit of steel wire increase, while the elongation and reduction of area decrease.
Due to the existence of work hardening, when the deformation degree of galvanized wire drawing reaches a certain value, it is not suitable to continue drawing due to the significant decline of the cold working performance of steel wire. Intermediate heat treatment is needed to restore its workability. Generally, the surface reduction rate of a drawing process is about 70% – 90%. Therefore, the technological process of steel wire production has the characteristics of a reciprocating cycle.
Our provides TC drawing die and PCD drawing die on the drawing die. In the copper wire drawing effect, we have done analysis before. If you need to further understand, click copper wire drawing.
| Grade | Cobalt Content | Density | Hardness | TRS |
| / | (%) | g/cm³ | HRA | N/mm² |
| YG6X | 6 | 14.95 | 91.5 | 1800 |
| YG6A | 6 | 14.95 | 90.5 | 1900 |
| YG8 | 8 | 14.7 | 89.5 | 1890 |
| YG11 | 11 | 14.4 | 97.5 | 2000 |
| YG15 | 15 | 14 | 86.5 | 2300 |
| YG20 | 20 | 13.8 | 86.5 | 2500 |
Write a Comment