Wire drawing dies are core tools used to reduce the diameter of metal wires (or change their cross-section) by pulling the wire through a precision-sized hole.
The inlet/lubrication cone is tapered to facilitate lubricant entry into the die orifice, ensuring the wire is adequately lubricated before entering the deformation zone, reducing friction and dissipating heat. The cone angle is typically between 40° and 60°. An angle that is too large or too small will affect lubrication and impurity removal.
The working cone/deformation zone is the core area where the metal undergoes plastic deformation and its diameter decreases. Its cone angle (i.e., the die angle) is a key parameter affecting the drawing force. A die angle that is too small increases friction; a die angle that is too large causes the metal deformation flow lines to bend sharply, increasing the drawing force. The optimal die angle is usually between 5° and 10°.
The sizing zone is a cylindrical area that determines the final precise diameter and dimensional accuracy of the wire. It stabilizes the wire and extends the die's lifespan. The length of the sizing zone needs careful selection. Too long a zone increases drawing force, while too short a zone compromises dimensional accuracy and die lifespan.
The exit cone/safety angle is used to protect the exit edge of the sizing tape, preventing it from cracking and allowing the wire to undergo slight elastic recovery after drawing, thus avoiding surface scratches. It is typically tapered or concave spherical, with a cone angle of approximately 60°-70°.
Basic Principle: Wire drawing is a cold forming process. One end of the metal wire is sharpened, passed through a die hole, clamped by drawing pliers, and forced through the die under the traction of the drawing machine. During this process, the cross-sectional area of the wire decreases, while its length increases.
Temperature Control: During the drawing process, a large amount of heat is generated due to metal deformation and intense friction between the wire and the die; the core temperature can exceed 200°C. Therefore, an effective lubrication and cooling system (such as emulsions or water cooling devices) must be used to maintain die performance and prevent overheating.
Main Types of Wear:
Abrasive Wear: Caused by continuous sliding friction between the wire and the die surface, this is the most common form of wear.
Adhesive Wear: Under high temperature and pressure, the wire material undergoes microscopic "cold welding" with the die surface, leading to material tearing and detachment.
Erosive Wear: Caused by impurities in the lubricant or metal powder generated during drawing erodes the die surface.
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