This paper deals with using the design of experiments (DOE) during the evaluation of mechanical properties of the wire for steel ropes. It was provided with a full factorial experiment with three factors at two levels. The factors are as follows: one-pass strain, the approaching angle and the method of the removing of the scales from the surface of hot rolled wire. The experimental material was a drawn wire with a 5.5 mm diameter of C78DP steel. The wire was drawn from the diameter of 5.5 mm to 2.5 mm using a straight-through single-block KOCH KGT 25 – E wire drawing machine. The total reduction was 79.3 %. The drawing dies of tungsten carbide had approach angles of 8° and 12°. Two uniform pass schedules were used with a different single-pass reduction. Two methods of descaling (mechanical and chemical) were used. Following each pass, an approx. 50 m sample was removed from the wire stock for subsequent testing. The following tests were carried out after each pass: tension test, torsion test to fracture and the reverse bend test to fracture. DOE was evaluated using both graphical and analytical methods. The significant factors and their interactions were determined and response surfaces were calculated.Keywords: Design of Experiments, wire drawing, patented wire, descaling, die geometry, pass reduction
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