The Traditional Theory of Wire Drawing Machine Matching C Method
★Symbol definition and related formulas In the past, the definition of symbols starts from the incoming line of wire drawing machine die, here is for the convenience of computer calculation (use Execl electronic form). Just the opposite.
- Aperture diameter of each mold: (exit mold) d1, d2, d3…dn….
- Elongation coefficient of each channel: (from fixed speed roller) μ1, μ2, μ3…μn…
- Speed-up ratio of each tower wheel: (starting from fixed speed roller) ν1ν2ν3…νn…
- Sliding coefficient of each track: τ1τ2τ3….τn…
- Absolute (cumulative) sliding coefficient of the nth cone wheel: Τn=Vn/Un
- Linear speed of the nth cone wheel: Vn
- The speed of the copper wire on the nth cone wheel: Un
- μn=νn*τn
9.√ The following takes the 17-die wire drawing machine as an example to illustrate the calculation method of the matching die:
Sliding coefficient τn: medium drawing machine generally takes: 1.02-1.04, take τn=1.03 C. Calculate the elongation coefficient of the wire: μn=νnτn=1.21.03=1.236 D. Determine the specifications of the incoming and outgoing wires: incoming wire: 2.80; outgoing wire : 1.00 E. Matching model calculation 1.0-1.112-1.236-1.374-1.528-1.698-1.888-2.099-2.334-2.595-2.800
The New Theory of Wire Drawing Machine Model Matching X Method
★Basis of new theory mold matching: the basis of low-sliding cable is: safe (uninterrupted) smooth (continuous) cable pulling, and the ability to minimize sliding.
Therefore, the minimum specification requirements for sliding coefficient: 1. τ3-τn requires 1.0-1.01, and the average value in the mold matching calculation is 1.005. 2. Safe sliding coefficient τ2 Here is the method for determining the safe sliding coefficient τ2. The structure of the performance of the low-sliding cable, the safe sliding coefficient is realized by reducing the speed-up ratio of the last tower wheel.
Therefore, the safe sliding coefficient τ2=(1.2/1.15)1.005=1.049. For example: 17 die wire drawing machine safe sliding coefficient τ2=(1.2/1.15)1.005=1.049; B22 wire drawing machine designed safe sliding coefficient τ2=(1.175 /1.15)1.005=1.027; B32 wire drawing machine safety sliding coefficient τ2=(1.15/1.12)1.005=1.032; S20 wire drawing machine safety sliding coefficient τ2=(1.12/1.08)1.005=1.042; S24 wire drawing machine safety sliding coefficient τ2=(1.1/1.08)1.005=1.024.
A. Determine the mechanical parameters of the wire drawing machine: Each wire drawing machine manual has equipment parameters, mechanical elongation (or different names), that is, the speed ratio of the adjacent tower wheels of the wire drawing machine, and some manuals have instructions for calculation. The speed-up ratio of the 17-die wire drawing machine is: 1.20:1, (the last one: 1.15:1), namely: νn=1.2
B. Sliding coefficient: 1. τ3-τn takes 1.005 2. Safe sliding coefficient τ2=(1.2/1.15)1.005=1.049 C. Calculate the elongation coefficient of the wire: μ1=ν1τ2=1.151.049=1.206 μn=1.21.005=1.206
D. Determine the specifications of the incoming and outgoing lines: incoming line: 2.80; outgoing line: 1.00
E. Matching model calculation: dn=dn-1*√μn (1.00-1.098-1.206-1.325-1.455-1.597-1.754-1.927-2.116-2.323-2.552-2.800)
Die Matching with Absolute Sliding Coefficient for Wire Drawing Machine
★Using the absolute sliding coefficient to match the basics: the wire drawing machine continuously draws the wire, and the volume of the wire per unit time is equal on each tower pulley. That is, U1S1=UnSn (U1: the speed of the wire on the constant speed wheel, S1: the cross-sectional area of the wire on the constant speed wheel), then Τn=Vn/Un Un=Vn/Tn, U1=V1 Set: absolute speed ratio Kn=V1/Vn safety sliding coefficient Τ2=τ2; the rest Τ3=Τ2+0.001….Τn=Τn-1+0.001
A. Sliding coefficient: 1. Safety sliding coefficient Τ2=τ2=(1.2/1.15)1.005=1.049. , leave the relative slippage) B. Determine the specifications of the incoming and outgoing lines: incoming line: 2.80; outgoing line: 1.00 C. Model matching calculation: 1. Assume that V1=1000 of the fixed speed wheel, and use the speed ratio of the adjacent tower wheel to calculate Vn 2. Calculate Kn through the absolute speed ratio Kn=V1/Vn 3. Through dn =d1×√KnTn, calculate the specifications of each mold. (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)
The main technical parameters of the wire drawing machine: Drawing unit: 6.0mm-3.5mm
Dimensions: height 2200mm width: 80mm length: 4000mm
Four consecutive cans
Power: 11 kW
Daily output: 10T (3.5mm-4mm)
Adopt the Yellow River reducer, pull out unit: 3.5mm-2.0mm
Dimensions: height 200mm width: 80mm length: 4000mm
five cans
Power: 7.5 kW
Daily output: 10T (1.5mm-2mm)
Using the Yellow River reducer
Large water tank: 2.0mm-0.5mm
