Cold rolled ribbed steel with residual stress how to eliminate? What are the methods to eliminate the residual stress of cold rolled ribbed bars? According to the technical staff of the cold-rolled ribbed steel bar equipment and cold-rolled ribbed steel bar production line of Cangzhou Jintongcheng Machinery Co., Ltd., there are two kinds of residual stress inside the ribbed steel bar after cold rolling, namely tensile stress and compressive stress. The two residual stresses of cold-rolled ribbed steel bars are balanced under certain conditions, and the wire size and shape are temporarily stable. However, due to the elastic aftereffect, the residual stress of the ribbed steel with different parts will change its shape, and then cause the entire wire to be deformed, and the earlier the deformation, the greater the damage. So since the residual stress has such a great harm to the cold-rolled ribbed steel, what methods should the customer adopt in the production process to eliminate the residual stress of the cold-rolled ribbed steel?
1. Using low-temperature tempering (200-300°C), the lattice is rearranged and the internal residual stress is released. The size and shape of the wire or spring are stable for a long time. All types of wire rods are tempered and tempered at low temperatures, and the age-hardening effect will occur at the same time as the internal residual stress is eliminated. The actual tensile strength tends to increase by a certain extent (5-10%).
2, as much as possible to reduce the non-uniformity of the deformation, the specific measures are: reduce the total reduction rate, the appropriate reduction in the last pass of the surface reduction rate (12-15%); use the appropriate coating and lubricant to reduce friction.
3. The straightening process is adopted to transform the potential of elastic deformation into surface plastic deformation to eliminate or reduce the tensile stress on the wire surface.
1. Using low-temperature tempering (200-300°C), the lattice is rearranged and the internal residual stress is released. The size and shape of the wire or spring are stable for a long time. All types of wire rods are tempered and tempered at low temperatures, and the age-hardening effect will occur at the same time as the internal residual stress is eliminated. The actual tensile strength tends to increase by a certain extent (5-10%).
2, as much as possible to reduce the non-uniformity of the deformation, the specific measures are: reduce the total reduction rate, the appropriate reduction in the last pass of the surface reduction rate (12-15%); use the appropriate coating and lubricant to reduce friction.
3. The straightening process is adopted to transform the potential of elastic deformation into surface plastic deformation to eliminate or reduce the tensile stress on the wire surface.
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