Stainless steel wire drawing
In the process of drawing, acting on the die orifice by drawing wire drawing unit cross-sectional area on the pullout stress
Safety
In the process of drawing, acting on the die orifice by drawing wire drawing unit cross-sectional area on the pullout stress
In order to make the metal plastic deformation occurring in the die hole and the drawing force sigma 1 must be greater than the die hole deformation of metal deformation resistance of sigma T; and in order to prevent the wire out of the mold hole to deformation is attenuated or snap to destroy the stability of the drawing process and the drawing force sigma 1 must be less than the die hole is yield limit sigma S metal wire drawing, therefore realizes the drawing process conditions are usually stated as: Sigma T< sigma possible value of sigma S. The safety factor of the drawing process is known as the ratio of K.
Condition
Withstand the cold drawing wire produced obvious strain hardening, the yield limit sigma S value is close to its ultimate strength of sigma B, in used in the production of sigma B value instead of sigma S. Therefore, to achieve the drawing process conditions can also be expressed as a sigma T< sigma possible value of sigma S; the safety coefficient K of the drawing process is also available sigma B and sigma 1 ratio of said.
Safety factor
Drawing process of safety coefficient K value in 140 ~ 2.0, K<1.40 said the drawing force sigma 1 is too large, die hole of the metal wire to deformation attenuated or fractured, the drawing process is not stable; K>2.0 illustrate the drawing force sigma 1 small, drawing deformation amount is too small, drawing increased. In drawing wire diameter is less than 0.05mm of ultrafine metal wire, through difficulties, in order to improve the stability of the drawing process, reducing the tensile and wear mode frequency, raise the production efficiency of drawing, the safety coefficient K value is greater than 2.0.
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