Application of absolute sliding coefficient matching method (method J)
Application basis: The wire drawing machine continuously draws the wire, the wire is on each capstan, and the volume per unit time is equal.

That is U1*S1=Un*Sn (U1: the speed of the wire on the fixed-speed capstan, S1: the cross-sectional area of ​​the wire on the fixed-speed capstan)

Then
Τn=Vn/Un
Un=Vn/Tn, U1=V1
Suppose: absolute speed ratio Kn=V1/Vn

Safety sliding coefficient Τ2=τ2; the remaining Τ3=Τ2+0.001...Τn=Τn-1+0.001

Each drawing machine manual has equipment parameters, mechanical elongation (or different name), that is, the ratio of the growth rate of adjacent capstans of the drawing machine, and some manuals have instructions for calculation.

B. Sliding factor:
1. Safety sliding factor Τ2=τ2=(1.2/1.15)*1.005=1.049.
2. Τ3-Τn takes: Τ3=Τ2+0.001....Τn=Τn-1+0.001 (when threding the die, leave the relative sliding amount)

C. Determine the specifications of inlet and outlet;
Inlet dia.: 2.80mm; Outlet dia.: 1.00mm

D. Calculation of die arrangement:
1. First assume that V1 of the fixed-speed wheel is 1000, and calculate Vn by using the speed increase ratio of the adjacent tower wheels of the machine
2. Through the absolute speed ratio Kn=V1/Vn, then calculate Kn
3. Calculate the specifications of each die through dn=d1×√Kn*Τn. (It is very convenient to actually use EXCEL)

(1.00-1.098-1.204-1.319-1.446-1.585-1.737-1.903-2.086-2.286-2.506-2.746-2.800)