Metal wire drawing stress state for three to two main stress always tensile stress to compressive stress, Stainless steel springs is compressed to three main stress state of stress compared to being drawn wire easier to achieve plastic deformation state. Drawing the deformed state is two to three to compressive deformation along the main tensile deformation of the deformed state, the state of play of a metal material plasticity disadvantageous, and more prone to the exposed surface defects. Metal wire drawing process, the amount of deformation passes subject to restrictions safety factor, the smaller pass deformation is drawing more passes, so often used in the production of wire consecutive multi-channel high-speed drawing.
In the drawing process, the role of being drawn out of the die at the drawing stress σ1 pulling force unit cross-sectional area of the wire on.Annealing Steel Wire In order to make the metal mold plastic deformation in the hole, drawing stress σ1 must be greater than the deformation resistance σT mold hole in the metal deformation zone; and in order to prevent the wire out of the die hole to continue after deformation attenuated or pull off so destabilizing drawing process, drawing stress σ1 must be less than the die hole after being drawn wire yield limit σs, so Annealing Steel Wire the condition for the drawing process is usually expressed as: σT <σ1 <σs. The ratio of K with the who called safety factor drawing process.
没有评论:
发表评论