Why should the length and compression Angle of drawing die be strictly controlled

The length and compression angle of drawing die should be strictly controlled because they play a critical role in the quality of the drawn wire or rod.

Firstly, the length of the drawing die determines the amount of reduction that the wire or rod undergoes during the drawing process. If the die is too short, the reduction in cross-sectional area will be insufficient, and the resulting wire or rod will be too thick. Conversely, if the die is too long, the reduction will be too great, which can cause the wire or rod to break or fracture. Therefore, the length of the drawing die must be precisely controlled to ensure that the wire or rod is drawn to the desired diameter.

Secondly, the compression angle of the drawing die also affects the quality of the drawn wire or rod. The compression angle refers to the angle formed by the entrance and exit radii of the die. If the compression angle is too small, the wire or rod will experience excessive friction as it passes through the die, which can cause surface defects, such as scratches or grooves. If the compression angle is too large, the wire or rod may experience excessive deformation and stress, leading to breakage or fracture. Therefore, the compression angle must also be strictly controlled to ensure that the wire or rod is drawn with the desired surface quality and mechanical properties.

In summary, strict control of the length and compression angle of the drawing die is crucial to ensure the quality of the drawn wire or rod, and to avoid issues such as breakage, fracture, or surface defects.