How does calculate the size of wire drawing die in the copper wire drawing machine?

Many copper wire drawing manufacturers do not know how to match the wire drawing die after buying the wire drawing machine, all rely on experience to match the die as long as the pull is constantly on the line, but such a die matching method will lead to the life of the wire drawing tower wheel is seriously shortened, if the raw material copper rod quality is not good enough to break the wire is very high, the following 24 die small drawing machine as an example to enter the wire matching die

Methods/Steps

First of all, we must know how much the mechanical surface reduction rate of the 24 die wire drawing machine is, the technical parameters provided by the wire drawing machine factory will be marked, the mechanical surface reduction rate of the standard 24 die is 13% or 15%, the mechanical surface reduction rate of the export die is 6% or 8%.

If the second-hand copper wire drawing machine is purchased without the equipment information provided by the manufacturer such as the manual, how can we know the mechanical surface reduction rate of this wire drawing machine? According to the diameter of the drawing tower wheel to calculate the mechanical surface reduction rate of the wire drawing machine, as shown in the figure K layer is 194.28mm, J layer is 165.14mm, the mechanical surface reduction rate is calculated =1-J/K=1-165.14/194.28=0.15=15%

According to the formula of mechanical surface reduction rate (dn=d0/√1-V-δ), the arrangement size of the wire drawing die is introduced, dn= large die aperture, d0= small die aperture, V= mechanical surface reduction rate, δ= slip coefficient (usually 1% ~ 2%).

For example, if the diameter of the outlet line is 0.20mm, according to the formula D large mold =D small mold /√1-13%-2%=0.20/√0.85=0.20/0.9219544=0.2169, that is, large mold =0.2169mm

By analogy with this formula, the mold of the last time of 0.2169 should be 0.2169/0.9219544=0.2352mm