EHL film thickness in wire drawing

Lubricant film thickness and drawing stress between wire and die, from area reduction, die angle, speed and lubricant properties.

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EHL film thickness in wire drawing — original diagram from /calculators/e12_1.htm

Area reduction, (A₁−A₂)/A₁%Wire diameter, d₁mmDie (reduction) angle, φdegWire speed, v₁m/sViscosity, η₀Pa·sPressure-viscosity coefficient, αₚ1/GPaExtrusion pressure, pₑMPaBearing length ratio, Lᵦ/d

Minimum film thickness, hₘᵢₙ0.7561453089767491 µm

Drawing stress, σ162.49667950545935 MPa

Output diameter, d₂2.23606797749979 mm

Output speed, v₂12.499999999999998 m/s

Viscosity ratio, η/η₀11.023176380641605

Reduction length, Lᵣ1.2624887721939966 mm

Bearing length, Lᵦ0.894427190999916 mm

Method & references

EHL lubrication in wire drawing — film thickness between wire and die.

The computation is a literal port of the original client-side JavaScript from /calculators/e12_1.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

EHL film thickness in wire drawing — Engineering ABC