Effect Of Machining Processes On Microstructure And Mechanical Properties Of 2600MPa Degree Rubber Hose Wire Rope

High strength rubber hose with steel wire rope is mainly used for reinforcing material of rubber skeleton, the materials of steel wire rope, mechanical properties, microstructure and twisting process will influence the performance of the rubber hose.In this paper,Taking the cold drawing of high carbon steel wire as the research objects, the effects of materials, drawing process, the parameters of wire drawing dies and twisting parameters on the mechanical properties of the steel wire. Scanning electron microscopy(SEM) was used to observe the evolution of the transverse and longitudinal microstructure of the high carbon steel wire. According to the study of work hardening mechanism, the drawing process parameters of high strength wire(over 2600MPa) was got.In the heat treatment process of high carbon steel wire, optimizing the heat treatment technolgy.Study on drawing die chain with different times of the effects of compressibility on the mechanical properties of steel wire shows that the average pass rate of optimal compression mechanical properties of steel wire 12.8%. With the increase of drawing strain,on cross section, pearlite lamellar spacing decreases with increasing true strain drawing. And it’s bending and torsion become more and moreintense. The parlite lamellar even fragments and breaks. On the longitudinal section, pearlite group tended to be consistent with the orientation ofthe tensile axis, and formed a parallel to the drawing direction layered organization and gradually refined.The relationship between the yield strength of the high-carbon steel wire and its true strain was double line. Model based on modified Ludwik quantitative reaction in the process of work hardening can stress-strain behavior, physical meaning of Hollmon model parameters by strain hardening coefficient K and the strain hardening index n to describe the change of the tensile properties of cold drawn steel wire drawing process, the two combined theoretical model can effectively describe the work hardening law of high carbon cold drawn steel wire.Through three different twisting process, found that the 1 ×24DW-3.50 mm comprehensive performance is the best. rupture develops basically in rubber when steel wire ropes were pulled out from rubber. The rupturing surface in vulcanized rubber is much roughness and avulsed edges can be found. But the rupturing surface, with some rubber powders on it in the aged rubber is comparably smoother. Rupturing which is vertical to main rupturing surface was also observed. It is considered that rubber aging can result in elasticity loss, brittleness, making the rupturing surface area decrease, which is considered to be the reas on why adhesion force between steel wire rope and rubber decreases. Production practice has proved that the properties of open construction steel wire rope fabricated with optimized structural parameters and production technology can reach that of foreign congener products, and the products can be the substitute of imported ones, being of great economic importance.