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Process for producing flat-bulb steel

A production process and technology of bulb flat steel, applied in the direction of manufacturing tools, metal processing equipment, cooling beds, etc., can solve the problems of influence of cross-sectional structure, single specifications, quality defects, etc., to achieve good versatility, good elasticity, profile easy to divide effect

Active Publication Date: 2016-04-13
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process improves the deformation asymmetry in the single rolling process, but still has the following defects: ① Special roll pass design is required, as well as special pass patterns such as finished hole and finished front hole, and conventional steel billets and rolls cannot be used. The special machine is dedicated, the economic benefit is poor, and the specification is single; ②The technical requirement is one-time pressing, which is limited by the load and elongation coefficient of the rolling mill, so that it is impossible to produce large-sized rolled pieces. For super-sized bulbous flat steel, a single piece is still required Rolling; ③The thickness of the middle joint of the two spherical flat steels rolled symmetrically is relatively thick, which brings difficulties to the subdivision of the next process. Defects; ④ For each specification of bulbous flat steel, it is necessary to design a separate steel billet of a specification, which cannot realize the common use of billets

Method used

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  • Process for producing flat-bulb steel
  • Process for producing flat-bulb steel
  • Process for producing flat-bulb steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the production process of this embodiment is: rectangular billet→heating→BD1 rolling→BD2 rolling→D R D F Rolling→natural cooling on cooling bed→cold cutting and straightening treatment.

[0029] Specific steps are as follows:

[0030] (1) If figure 1 As shown in the figure, the rectangular blank is widened into a flat blank by the first blanking machine (BD1). Through zone rolling, the extension of the rolling stock is reduced and the extension is increased, so that the amount of extension can be increased by 30% compared with the conventional extension. At the same time, the rectangular billet can be fully extended with a small force, which is suitable for extension Large-sized rectangular blanks.

[0031] BD1 rolling specifically includes 7 passes: the first pass is to press out two grooves on the upper and lower sides of the rectangular billet; the second pass is to flatten the bosses between the two grooves; the third pass 3 times, flatten the bos...

Embodiment 2

[0037] Embodiment 2, the production process of this embodiment is: rectangular billet→heating→BD1 rolling→BD2 rolling→D R D F Rolling→cold bed strong air cooling→cold slitting and straightening treatment. Except for "cooling with strong air cooling on a cooling bed", other processes are the same as those in Embodiment 1, and will not be repeatedly described in this embodiment.

[0038] The specific cooling bed strong air cooling process is D R D F The raw material obtained in the rolling enters the cooling bed workshop 12 for cooling, and the cooling bed workshop 12 is as follows: Figure 4 As shown, including the cooling bed 6, the foundation pit, the ventilator 14 and the forced cooling fan 5, the cooling bed inlet 11 and the cooling bed outlet 7 of the cooling bed workshop 12 are respectively provided with an inlet foundation pit 8 and an outlet foundation pit 9. Both the pit 8 and the outlet foundation pit 9 extend out of the cooling bed workshop 12 , and the length and ...

Embodiment 3

[0040] Embodiment 3, this embodiment is temperature-controlled rolling on the basis of embodiment 1, and the production process is: rectangular billet → heating → BD1 rolling → BD2 rolling → temperature control treatment → D R D F Rolling→cooling→cold cutting and straightening treatment. The temperature control treatment is as follows: after BD2 rolling, the temperature of the "wave-shaped" material shape is 940°C to 1010°C, and the material shape is then cooled by a water curtain to reduce the temperature to 700°C to 750°C, and the temperature remains in this temperature range. D inside R D F rolling. Its purpose is to increase the elasticity of the bulb flat steel.

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Abstract

The invention discloses a process for producing flat-bulb steel, belonging to the field of metal rolling. The production process comprises the following steps: (1) BD1 rolling; (2) BD2 rolling; (3) DRDF rolling; (4) primary material cooling; (5) subdividing and straightening for the cooled primary materials. Compared with the prior art, the process has the characteristics of being good in universality of steel billet and rollers, large in size range of final products and good in quality of the final products.

Description

technical field [0001] The invention relates to a steel production process, in particular to a rolling process suitable for flat bulb steel. Background technique [0002] Flat bulb steel is a kind of special section steel, mainly used in shipbuilding and bridge building, but with the rapid development of the shipbuilding industry in recent years, flat bulb steel has gradually become a special name for marine flat bulb steel, and it is the most important one in marine section steel. It is mainly used as a reinforcing rib of the ship board, which is equivalent to a human "rib". Bulb flat steel is composed of flat web and spherical ball head. It is an asymmetric section steel. In the prior art, single-piece rolling is commonly used, that is, it is directly pressed according to the load and elongation coefficient of the rolling mill. The specific production process steps are billet→heating→single wire rolling→straightening. Due to the asymmetrical deformation in the single rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/12B21B43/00
CPCB21B1/12B21B43/00
Inventor 王福良魏振洲薛跃华李振华李现富焦峰刘春颖
Owner RIZHAO STEEL HLDG GROUP
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