CN2590678Y

CN2590678Y - Cold rolling angle spiral reinforcement

Info

Publication number: CN2590678Y
Application number: CN 02237691
Authority: CN
Inventors: 刘宝珩; 刘德民
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-25
Filing date: 2002-06-25
Publication date: 2003-12-10
Anticipated expiration: 2012-06-25

Abstract

The utility model relates to cold rolling triangular spiral reinforcement. The end surface of the utility model forms a circular triangle, namely angle parts form circular arc angles and side parts form circular arc shapes; the circular triangle extending at an axial direction forms a spiral shape, and a spiral angle is from 15 DEG to 30 DEG. The utility model has high yield limit sigma S and also has large extensibility delta, and the shape of the utility model has high combining capacity with concrete.

Description

Cold rolling triangular spiral bar

(1) technical field

The utility model relates to a kind of novel cold rolled reinforcing bar.

(2) background technology

At present, cold rolled reinforcing bar has two kinds.A kind of is cold rolled reinforcing steel bar with ribs.This reinforcing bar is cold rolling through multi-pass with circular blank, shuts out on the roll with the pass that has the crescent cutting on the Y shape milling train then.Because deflection is too high, its plasticity index descends, and percentage elongation δ has only about 4%.Another kind is a cold-rolled torsion steel bar.This reinforcing bar is to use than heavy reduction with the hot rolling circular blank to flatten on the duo mill plain-barreled roll, is reversed into screw type then.Because the blank side is easy to cracking during through flattening, its percentage elongation δ also has only about 4%, and unstable properties.With above-mentioned two kinds of resulting cold rolled reinforcing bars of method, its nominal diameter all is not more than Φ 14mm, and percentage elongation δ is lower, has limited the application in building field greatly.

(3) summary of the invention

For solving the existing existing problem of cold rolled reinforcing bar, the utility model provides a kind of novel cold rolled reinforcing bar.

Cold rolled reinforcing bar of the present utility model is characterized in that, its section is a triangle, triangle shape in the shape of a spiral on the axially-extending direction, and helixangle is～15 °.

This kind cold rolled reinforcing bar adopt circular blank in pass through cold rolling, twisting formation then, its deflection can be regulated, and can reach intensity and plasticity index best of breed.

Compare with existing cold rolled reinforcing bar, cold rolled reinforcing bar of the present utility model can have bigger nominal diameter, and percentage elongation δ has bigger increase, is applied to improve security performance in the building element, strengthens with concrete binding ability, has better anchoring.

(4) description of drawings

Fig. 1 is the deflection ε and the yield limit σ of mild steel (0.1%C) _sRelation curve with percentage elongation δ;

Fig. 2 looks and sectional schematic diagram for the master of cold rolled reinforcing bar of the present utility model.

(5) specific embodiment

Referring to Fig. 1, when the deflection ε of mild steel increases gradually, its yield limit σ _sIncrease, its percentage elongation δ reduces thereupon thereupon.When deflection ε reaches high value, its yield limit σ _sAlso reach high value, percentage elongation δ then drops to than low value.

Existing cold steel bar rolling method adopts bigger deflection ε, though the yield limit σ of resulting cold rolled reinforcing bar _sIncreased, but its percentage elongation δ greatly reduces, low percentage elongation δ obviously brings adverse influence to the use of cold rolled reinforcing bar.

The utility model adopts and existing cold steel bar rolling method diverse ways, as shown in Figure 1, select a rational cold working district, in the pass design, the deflection ε of mild steel is controlled at a suitable scope, promptly adopt suitable deflection, thereby make the yield limit σ of the cold rolled reinforcing bar that obtains _sWith percentage elongation δ all than higher.

In cold-rolled process, adopt circular blank through pass, twisting formation then, its deflection can be regulated, and is controlled in the cold working district, thereby realizes yield limit σ _sWith the best of breed of percentage elongation δ, prevent to produce brittle fracture, strengthen the materials security.

Referring to Fig. 2, cold rolled reinforcing bar of the present utility model, its end face is triangular in shape, and at axially-extending direction triangle shape in the shape of a spiral, helical angle is～15 °.This cold rolled reinforcing bar had both had higher yield limit σ _s, have bigger percentage elongation δ again, and its profile and concrete have higher binding ability.Can realize producing big specification cold rolled reinforcing bar and can form Φ 10～Φ 50 product lines according to appointed condition.Thereby realize substituting the hot-rolled reinforced bar target with cold rolled reinforcing bar.

Claims

1. cold rolling triangular spiral bar, it is characterized in that, its section is a triangle, triangle shape in the shape of a spiral on the axially-extending direction, helixangle is～15 °, and this kind reinforcing bar is rolling through the triangle pass with circular blank, then twisting formation, its deflection can be adjusted and reach intensity and plasticity index best of breed, can realize producing big specification reinforcing bar.