Method for producing reinforced bar with anchoring section

A manufacturing method and technology of anchoring parts, applied in the direction of building structure, structural elements, building components, etc., can solve the problems of appearance and commodity value reduction, and achieve the effect of excellent high-temperature processability and good toughness

Inactive Publication Date: 2009-01-28
DAI ICHI HIGH FREQUENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Even if the enlarged diameter portion forming surface becomes rough and hairline cracks occur on the enlarged diameter portion forming surface, there will be no problem in performance as a steel bar with an anchorage portion, but the appearance and commercial value will decrease

Method used

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  • Method for producing reinforced bar with anchoring section
  • Method for producing reinforced bar with anchoring section
  • Method for producing reinforced bar with anchoring section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] has the composition shown in Table 1 below, by using figure 1 (a) The heating device for the induction coil (20) of the shape shown, the heating is formed by a special-shaped bar steel (specific bar steel) with an Ac3 phase transition temperature (calculated value) of 809°C and an outer diameter D (nominal diameter) = 25mm The end region (length = 7D) on one end of the bar such that it has a temperature distribution in such a way that the temperature of the end region increases continuously as it approaches the end face of the bar.

[0096] Measure the temperature (T 1 ), and the temperature (T 2 ), temperature (T 1 ) is 1350℃, temperature (T 2 ) is 1000°C.

[0097] Immediately thereafter, the induction coil 20 is retreated from the end region, and the figure 1 The molding surface (31) of the mold (30) shown in (b) to (d) presses the end surface of the steel bar, and applies an axial compressive force to the steel bar to compress the end region. Here, the compre...

Embodiment 2～4

[0099] In addition to making the temperature (T 1 ) and temperature (T 2 ) was changed to the numerical values ​​shown in Table 1 below, except that the heating conditions were changed in the same manner as in Example 1, and a steel bar with an anchorage portion was produced.

Embodiment 5～10

[0101] Except for changing the composition of the reinforcing bar (special-shaped steel bar) according to Table 1 below, the reinforcing bar with the anchorage part was produced in the same manner as in Example 1.

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Abstract

The invention aims at providing a manufacturing method of a steel bar with an anchoring part. By adopting the manufacturing method, a diameter expansion part with proper shape can be practicably formed to be used as the anchoring part. The manufacturing method of the steel bar comprises the following procedures: an end area of a steel bar (10) is heated, and high-temperature upsetting processing is carried out: the end area to be heated is compressed in the axial direction to be deformed by increasing the outer diameter, thus a diameter expansion part (102) of the anchoring part is formed integrally; heating is carried out to continuously or periodically raise the temperature of the end area of the steel bar (10) with the approaching of an end face (10A), the temperature (T1) of a part away from 2.0D in the axial direction from the end face (10A) of the steel bar (10) is not less than 1300 DEG C which is less than the melting point of the steel bar, and the temperature (T2) of a part away from 5.0D in the axial direction from the end face (10A) of the steel bar (10) is not less than Ac3 phase-transition temperature of the steel bar and not more than 1200 DEG C.

Description

technical field [0001] The present invention relates to a method of manufacturing a steel bar with an anchor (fixing part), and more particularly to a method of manufacturing a steel bar with an anchor having an anchor composed of an enlarged diameter part integrally formed at an end of the steel bar . Background technique [0002] Currently, steel bars used in reinforced concrete structures are bent at their ends in a U-shape or L-shape to serve as anchors, and the anchors are fixed to other steel bars or concrete. [0003] However, in order to increase the fixing strength with respect to concrete, it is necessary to enlarge the U-shaped or L-shaped part of the steel bar whose end is bent into a U-shaped or L-shaped structure, so the volume increases, and it is difficult to install in a narrow space. Construction is carried out at different places, and there is a problem that the bending process of the steel bar end is difficult and the cost is high. [0004] In response ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/08C22C38/60C22C38/16C22C38/04E04C5/03
Inventor 高岸正章前之园司北山信义
Owner DAI ICHI HIGH FREQUENCY
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