Variable-channel mold for improving drawing toughness of steel bar

A technology of changing channels and steel bars, applied in wire drawing dies and other directions, can solve the problems of reducing toughness, high processing cost, complex structure, etc., and achieve the effects of reducing drawing force, reducing toughness damage and improving economic benefits.

Inactive Publication Date: 2014-05-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Variable-channel mold for improving drawing toughness of steel bar
  • Variable-channel mold for improving drawing toughness of steel bar
  • Variable-channel mold for improving drawing toughness of steel bar

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Embodiment Construction

[0018] This embodiment is a variable-channel mold for improving the drawing toughness of steel bars, which is suitable for steel bars with a compression rate of 40%-53% in the drawing forming part.

[0019] When using the variable channel die to draw and form steel bars, one end of the round wire rod blank is first rolled so that it can pass through the drawing die, and then the drawing equipment is driven to make the round wire rod blank pass through the straightening section, the deformation section and the In the fixed-diameter section, the disc rod passes through the deformation section after being straightened, and its cross-sectional shape gradually changes from a large circular cross-section to a twisted oval cross-section, and then gradually changes from a twisted oval cross-section to a small circular cross-section , and finally form the required cold-drawn reinforced steel bars through the sizing section.

[0020] When using the variable channel mold to deform the ci...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/02
Inventor 王瑞亭李付国李江
Owner NORTHWESTERN POLYTECHNICAL UNIV
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