Variable-channel mold for improving drawing toughness of steel bar

Abstract

The invention discloses a variable-channel mold for improving the drawing toughness of a steel bar. An upper mold and a lower mold are buckled, and the mold forms a mold cavity with variable channel and variable section. The mold cavity comprises a straightening section, a deforming section and a sizing section sequentially, wherein the straightening section is a steel bar drawing front section, and the cross section of the mold cavity is a large circular section; the sizing section is a steel bar drawing rear section, and the cross section of the mold cavity is a small circular section. The mold cavity of the deforming section is partitioned to be a large circle to ellipse traditional twist section and an ellipse to small circle traditional twist section. The section of each section gradually deforms from a large circular section to a twisted elliptic section, and then gradually deforms from the twisted elliptic section to a small circular section, finally a required cold-drawing reinforced steel bar is molded from the sizing section. When the variable-channel variable-section mold is used in a steel bar cold machining, the toughness damage of the mold to the materials is low, the metal grains can be thinned under the condition of multi-section deformation, consequently, a preferable toughness is obtained while the strength of the cold-drawing steel bar is improved.

Description

technical field [0001] The invention belongs to the field of cold working forming of steel bars, and in particular relates to a channel-changing die for improving the drawing toughness of steel bars. Background technique [0002] Cold working of steel bar is a kind of technological method commonly used to improve the strength of steel bar at present. The cold working process of steel bar mainly includes cold drawing, cold drawing, cold rolling, cold rolling and torsion, etc., wherein the cold drawing process is to apply a certain force in the axial direction of the steel bar. Tensile force, and deform it beyond the yield point to obtain higher yield strength. However, this traditional processing method will reduce the plasticity and toughness of the steel bar, and at the same time, it will cause the problem of uneven quality of the steel bar. Therefore, the seismic performance of the steel bar will be reduced during use; It is to reduce the diameter of the wire rod steel ba...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of complex equipment structure, high processing cost and process technology that can seriously reduce the toughness of the steel bar while increasing the strength of the steel bar in the prior art, the present invention proposes a variable-channel die for improving the drawing toughness of the steel bar

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