Manufacture And Fatigue Study Of Steel Cord-rubber Composite Used In Heavy Truck Carcass

In this paper,through the optimization of steel wire drawing process and steel cord twisting process,and the technological innovation of steel wire coating process,the steel cord reinforcement material used in heavy truck carcass was prepared firstly;Then,through vulcanization process and optimization of process parameters,the steel cord rubber composite was prepared,so as to improve the fatigue performance of the steel cord rubber composite and the service life and safety reliability of heavy truck tire.The results show that:The effect of strength and diameter of steel cord monofilament on the fatigue properties of composites is studied.The results show that the fatigue properties of composites are increased with the increase of monofilament strength;The fatigue properties of the composites are increased with the decrease of filament diameter.Especially,when the inner monofilament strength is increased from 3450 MPa to 3815 MPa,the outer monofilament strength is increased from 3195 MPa to 4135 MPa,and the wire diameter is changed from 0.24/0.225 mm to 0.22/0.20 mm,the fatigue performance of the composite reaches to 194336 cycles,which is 139% higher than that of the traditional steel cord reinforced composite.The effect of permeability between steel cord and rubber on the fatigue properties of composites is studied.The results show that if the permeability between steel cord and rubber is better,the fatigue performance of composite is better.In particular,when the air permeability of the composites decreases from 98% to 2%,the fatigue performance of the composites reaches to 177497 cycles,which is 133% higher than that of the traditional steel cord reinforced composites.The effect of the outer winding wire lay length and lay direction on the fatigue properties of composites is studied.The results show that if the lay length of the outer winding wire is bigger,the fatigue property of the composite is better;if the twist direction of the outer wire is consistent with that of the outer wire,the fatigue property of the composite is better.Especially,when the lay length is increased from 3.5mm to 5mm and the lay direction is changed from S to Z,the fatigue performance of the composite reaches to 185595 cycles,which is 76% higher than that of the traditional steel cord reinforced composite.The effect of copper content and cobalt addition in steel cord coating on the fatigue properties of composites is studied.The results show that if the copper content of the coating is lower,the adhesion between the steel cord and rubber is better,and the fatigue performance of the composite is better;the addition of cobalt element in the coating can improve the aging adhesion between steel cord and rubber,thus can improve the aging fatigue performance of the composite.Especially,when the copper content of the coating is 67%,zinc content is 29% and cobalt content is 4%,the adhesion force of the composite under steam aging reaches to 800 N,which is 60% higher than that of the traditional composite;The results show that the fatigue performance of the composite under steam aging reaches to 28470 cycles,which is 136% higher than that of the traditional composite.The effect of vulcanization process on the fatigue properties of composites is studied.The results show that if vulcanization temperature is too high or too low,vulcanization time is too long or too short,the adhesion of the composite will be affected,which will affect the fatigue performance of the composite.When the vulcanization temperature is150°C and the time is 30 min,the adhesive force of the composite reaches to the highest803 N,and the adhesive rate reaches to the highest 90%.