CN1500571A - Cold-rolling triangle helical reinforcing steel bar and the production for the special rolling machine - Google Patents

Abstract

The present invention provides serial developed cold rolled steel bar product of 10-50 mm diameter provides cold rolled spiral triangular steel bar capable of replacing hot rolled spiral steel bar, and this is significant for building industry. The specially designed rolling machine for producing cold rolled spiral triangular steel bar can complete the plastic deformation of extending and torsion of circular blank in the identical deformation area, and the deformation amount may be controlled to realize the optimal combination of strength and plastic deformation. The plastic index delta may reach 6-8 % to raise the safety of cold rolled steel bar, and the spiral form has higher anchoring strength of combining with concrete.

Description

The production of cold rolling triangular spiral bar and special rolling mill thereof

Technical field

The present invention relates to a kind of novel cold rolled reinforcing bar in the structural steel.

Background technology

Hot-strip is through after cold rolling, and its intensity obviously improves.Use cold rolled reinforcing bar for this reason and can save steel, also may reduce building element weight and cost simultaneously.All used cold rolled reinforcing bar as far as possible and substitute hot-rolled reinforced bar modern age in skyscraper, highway and bridge and the residential housing.

The cold rolled reinforcing bar applicating history is not long, and abroad, Austria and some countries of Europe use " Tor " reinforcing bar from nineteen thirty-five, and it is the hot rolled circular steel that a surface has two vertical symmetrical ribs to be carried out cold twisting change, and makes it form the helical form cold-finished steel." Drillwulst " reinforcing bar of Germany is with cold twisting after 4 round steel hot rollings together then becomes." Caron " reinforcing bar of France is to be that the shaped steel of band arc chord angle passes through the cold twisting curl and forms with the cross section." Tencor " reinforcing bar that use in Denmark and West Europe is a hot-rolled reinforced bar that has two longitudinal ribs, and cold working is simultaneously reversed in drawing through one side, promptly stretches to add to reverse and form the helical form reinforcing bar." Torma " reinforcing bar of Holland is with the round steel indentation of colding pressing earlier, and cold twisting commentaries on classics and drawing processing makes its surface form the cold-finished steel of screw thread then.

Use cold rolled reinforcing bar in the building industry at present, kind and share are all less.That wherein lists national standard in only has a cold rolled reinforcing steel bar with ribs (GB13788-92) [1].This kind reinforcing bar is shutting out with having on the crescent cutting roll Pass on the Y shape milling train with circular blank.Its plasticity index is descended, have only～about 4% [1].

It is cold-rolled torsion steel bar [2] that a kind of cold rolled reinforcing bar on probation is arranged on the market.It is to use than heavy reduction with the hot rolling circular blank to flatten on duo mill, is reversed into spirality then.Because it is through flattening and reverses twice plastic deformation, and flat limit portion deflection maximum, its plasticity index δ=～4%, and unstable properties [2],

Hot-strip its intensity after cold rolling increases with the distortion degree and improves, but its plasticity index descends.Existing cold rolled reinforcing bar is excessive because of deflection, and plasticity index δ % is all lower.There is certain hidden danger in this on construction material safety, develop the cold rolled reinforcing bar new varieties for this reason, make its hot rolling blank intensity and plasticity index after cold rolling reach best of breed, deflection is controlled in the cold working district, can obtain higher plasticity index, and intensity also increases to some extent, and cold rolling triangular spiral bar can satisfy above-mentioned requirements.

Summary of the invention

1, creates the new cold rolled reinforcing bar product line of a cover: φ 10～φ 50 cold rolling triangular spiral bars.

(1) realize developing big specification cold rolled reinforcing bar and replace the hot-rolled screw thread reinforcing bar, this will reduce building element weight, save steel and reduce cost.

(2) on special rolling mill during steel bar cold rolling, extend simultaneously and reverse plastic deformation, its deflection can be regulated control and intensity σ and plasticity index δ reached give the index futures mark on milling train.

(3) its triangle helical shape makes reinforcing bar combine with concrete and forms the anchoring raising.

2, cold rolling triangular spiral bar special rolling mill is a roller trio skew rolling formula milling train, drives three rolls by a motor, and drafts can be adjusted.Can design the different model milling train according to the roller diameter size, be used to produce φ 10～φ 50 cold rolling triangular spiral bar product lines, milling train mechanism as shown in Figure 3.

Description of drawings

Fig. 1 is the outline drawing of several cold rolled reinforcing bars;

Fig. 2 is mild steel (0.1%C) cold rolling back deflection ε % and yield point σ s and plasticity index δ % relation curve.

Fig. 3 is cold rolling triangular spiral bar milling train mechanism map.

The specific embodiment

(1) simulation is made mini Mod and is verified that feasibility---this experiment the author finish, shut out sample.

(2) manufacture and design the experiment special rolling mill, scientific research project verification and application fund are declared in units concerned's contact simultaneously.

The rolling φ 10～φ 16 steel samples of energy roll aftershaping and carry out service check through authoritative institution on this milling train, require to meet the building industry requirement in this stage solution performance and profile.Properties of product should be better than market product.

(3) determine product specification with the building industry cooperation by market demands, problems such as production scale are carried out the small-scale trial production.

List of references: [1] constructional iron material standard compilation

The reinforcing bar Chinese Industrial Standards (CIS) is published Du 1999

[2] cold-rolled torsion steel bar key property and application thereof

Chinese Industrial Standards (CIS) is published Du 1998

[3] design and construction of cold-rolled torsion steel bar and xoncrete structure thereof

Tongji University publishes Du 2000

Claims (3)

1, the production of a kind of cold rolling triangular spiral bar and special rolling mill thereof is characterized in that, its section is rounded triangle, its limit portion also is arcuation, three angles of elongatedness direction are shape in the shape of a spiral, and helixangle=～30 form φ 10～φ 50 cold rolling triangular spiral bar new varieties series.

2, the production of cold rolling triangular spiral bar according to claim 1 and special rolling mill thereof, it is characterized in that, adopt the hot rolling circular blank on special rolling mill, once to shut out, finish extension and reverse plastic deformation, be bolt shape, have the combination of good intensity and plasticity index.

3, the production of cold rolling triangular spiral bar according to claim 1 and special rolling mill thereof, it is characterized in that, special special rolling mill for the cold rolling triangle spiral bar design of production is a three-roller type, three rollers are hexagonal angle mutually, helixangle drafts of roller declination can be adjusted, metal bears extension and reverses the both direction plastic deformation in the deformed area when rolling, therefore can shut out the triangle helical shape, can produce φ 10～φ 50 all size cold rolled reinforcing bars according to mill rolls through difference.

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