WO2020004703A1

WO2020004703A1 - Method for manufacturing and correcting high-strength beam reinforcing member having closed section

Info

Publication number: WO2020004703A1
Application number: PCT/KR2018/009021
Authority: WO
Inventors: 박종배; 윤춘호; 구윤식
Original assignee: 현대오토솔루션(주)
Priority date: 2018-06-28
Filing date: 2018-08-08
Publication date: 2020-01-02
Also published as: KR20200001896A; KR102091820B1

Abstract

The present invention relates to a method for manufacturing and correcting a high-strength beam reinforcing member having a closed section and, more specifically, to a beam reinforcing member manufacturing method, which: improves a conventional beam reinforcing member manufacturing process of manufacturing a profile of a beam reinforcing member by roll forming and then manufacturing a closed section profile through welding; manufactures and corrects a beam reinforcing member, which has a closed section profile formed by using a steel pipe, through a process combined with a process of correction by a profile drawing roll; increases process efficiency; and improves the strength of the beam reinforcing member. The method for manufacturing and correcting a beam reinforcing member having a closed section according to the present invention can use a steel pipe to form a curved closed section, can simplify a beam reinforcing member manufacturing process, and can increase the strength of the beam reinforcing member.

Description

Manufacturing and correction method of high strength beam reinforcement to form closed sections

The present invention relates to a method of manufacturing and calibrating a high strength beam reinforcement in which a closed section is formed, and more particularly, to manufacturing a beam reinforcing member having a cross section shape of a closed section by welding after manufacturing a shape by conventional roll forming. In the manufacturing method of beam reinforcement which improves the process efficiency and improves the strength, manufacturing and correcting the beam reinforcement which forms the cross-sectional shape of the closed section by the process of the correction process by the shape drawing roll using the steel pipe. It is about.

In general, the process of manufacturing the existing beam reinforcing material was manufactured in the form of forming a cross-sectional shape of the closed section by welding the connecting portion after the roll forming using a plate.

Roll forming is a process in which the side part is rolled and processed into the form which is going to manufacture finally, as a board | plate material which becomes a raw material by providing a plurality of rolls in multiple stages is passed.

This is a complicated process, and in order to complete the final shape, there is a problem in that the strength is limited because the end surface to be contacted to form a cross section of the closed section by welding.

Accordingly, it is necessary to improve the process that can simplify the process and improve the strength.

To this end, although the beam reinforcement was intended to be manufactured by processing a material that is already provided in the closed section cross-sectional shape, such as a steel pipe, the conventional section manufactures a closed section cross-sectional shape in which a complex curved surface is formed to increase strength. Was not easy.

In this regard, looking at the prior art, "the manufacturing method of the vehicle beam reinforcing material" is disclosed in the Republic of Korea Patent Publication No. 10-2015-0079292, which does not solve the above problems.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide a method of manufacturing a beam reinforcing material that can form a cross section of the closed section of the curved shape using a steel pipe.

In addition, an object of the present invention is to provide a manufacturing method that can increase the calibration efficiency through the straightness correction by the roll in the manufacture of the beam reinforcing material.

In addition, an object of the present invention is to provide a manufacturing method that can simplify the manufacturing process of the beam reinforcing material.

It is also an object of the present invention to provide a manufacturing method that can increase the strength of the beam reinforcing material.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another problem to be solved by the present invention not mentioned here is those skilled in the art to which the present invention pertains from the following description Will be clearly understood.

According to the present invention, a method for manufacturing and calibrating a high strength beam reinforcement in which a closed section is formed includes a first step in which a steel pipe is provided, a second step of drawing the steel pipe into a predetermined cross-sectional shape, and the drawing drawn through the second step. A third step of correcting the straightness of the steel pipe, a fourth step of cutting the steel pipe drawn through the third step, and heat treatment of the steel pipe cut through the fourth step, followed by quenching to form a beam reinforcing material. It consists of five steps.

The method for producing and calibrating a high strength beam reinforcement in which a closed section is formed according to the present invention has the effect of forming a closed section of a curved section using a steel pipe.

In addition, the present invention has the effect of preventing the distortion through the correction by the roll, and to increase the straightness of the calibration efficiency during the manufacture of the beam reinforcing material.

In addition, there is an effect that can simplify the manufacturing process of the beam reinforcing material.

In addition, there is an effect that can increase the strength of the beam reinforcing material.

1 is a flow chart of the manufacturing and calibration method of the high-strength beam reinforcement is formed a closed section according to the present invention.

Figure 2 shows the change in the shape of the cross-sectional shape of the closed section of the steel pipe according to the drawing process of the manufacturing and calibration method of the high-strength beam reinforcement is formed in the closed section according to the present invention.

Figure 3 shows an example of the drawing process according to the mold during the drawing process of the manufacturing and calibration method of the high-strength beam reinforcement is formed a closed section according to the present invention.

Figure 4 shows the form of the mold during the secondary drawing process of the manufacturing and calibration method of the high-strength beam reinforcement is formed a closed section according to the present invention.

S10: first step

S20: second stage

S30: the third step

S40: fourth step

S50: the fifth step

A: steel pipe

10: Outer Forming Mold

11: outward protrusion section forming unit

20: inner mold forming mold

21: inner peripheral protrusion section forming unit

30: protrusion section

Specific matters including the problem to be solved, the solution to the problem, and the effects of the present invention as described above are included in the embodiments and drawings to be described below. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

According to the present invention, a method for manufacturing and calibrating a high-strength beam reinforcement in which a closed section is formed includes a first step S10 in which a steel pipe A is provided, and a second step of drawing the steel pipe A into a predetermined cross-sectional shape ( S20), a third step (S30) of correcting the straightness of the steel pipe drawn through the second step (S20), a fourth cutting the steel pipe (A) drawn through the third step (S30) Step S30, after the heat treatment of the steel pipe (A) cut through the fourth step (S30), and quenched to comprise a fifth step (S50) of forming a beam reinforcing material.

First, in the first step (S10), a steel pipe (A) is provided.

The steel pipe (A) may be formed in any form as long as the closed section is formed, the steel pipe (A) can be formed to the strength of the beam reinforcement can be formed.

More preferably, it is preferable to be used as ERW steel pipe A.

By processing the beam reinforcement using the steel pipe (A), after performing the roll forming using the existing plate material, it is possible to improve the process by eliminating the process of forming a beam reinforcement to form a closed cross-section by welding.

Next, the second step (S20), the steel pipe (A) is drawn in a predetermined cross-sectional shape.

In the second step (S20), the steel pipe (A) is drawn into a similar shape to the final shape of the beam reinforcement to be produced by drawing.

During the drawing process, cold working is carried out at 25 ~ 100 ℃.

Specifically, in the second step (S20), the drawing process is carried out continuously 2 to 5 times, it is configured that the drawing process can be repeatedly performed in a form that gradually approaches the shape of the inner peripheral surface of the mold. desirable.

More preferably, it is advantageous that the drawing process is carried out five times continuously.

Specifically, the drawing process, in the initial drawing (once), as shown in Figure 2 (a), the drawing is carried out in the form of an ellipse is formed the same outer peripheral surface length as the final shape.

As the drawing process is performed 2 to 5 times, processing proceeds to a shape similar to the cross-sectional shape of the final closed section, as shown in FIGS.

The cross-sectional shape of the closed section formed through the drawing shows an example, and as the drawing process is performed five times, it is possible to process the cross-sectional shape of the closed section requiring complicated bending.

In the drawing, the mold to be applied includes an outer mold forming mold 10 and an inner mold forming mold 20.

Specifically, the outer circumferential forming mold 10 is a mold in which the workpiece is contacted to the inner surface to form an outer circumferential surface formed as the steel pipe A is drawn and the hole is formed to be processed. Is formed.

The inner circumferential forming mold 20 is provided with a mold in which a workpiece is contacted to the outside so as to form an inner circumferential surface formed as the steel pipe A is drawn out, and processing may be performed.

The inner circumferential forming mold 20 is commonly referred to as Mandrel, and means a mandrel that is applied to a drawing process such as a tube.

The outer circumferential forming mold 10 is provided so that the curvature and the angle can be formed individually in the drawing process performed over 1 to 5 times.

Specifically, as shown in (a) and (b) of Figure 2, when the primary and secondary drawing, the outer forming mold 10 is applied, as shown in (a) of Figure 3, Curvature is formed on the inner circumferential surface.

As shown in (c) to (e) of FIG. 2, the outer circumferential forming mold 10 applied in the third to fifth drawing may have a degree on the inner circumferential surface as shown in FIG. It is provided to be formed.

This is to prevent breakage and defects of the surface of the steel pipe A during the drawing process.

More specifically, it is preferable that the curvature R of the outer peripheral forming mold 10 to be applied at the time of primary drawing is composed of 68 ~ 72.

This is because when a curvature outside the curvature range is formed, deformation may occur over the entire steel pipe A material.

In the second drawing, the outer peripheral mold 10 to be applied preferably has a curvature R value of 68 to 72.

When the secondary drawing, when the curvature value of the outer peripheral mold 10 to be applied is formed below 68, distortion may appear on the surface of the steel pipe (A) due to the excessive deformation amount, the curvature value is 72 When exceeded, the amount of processing deformation becomes small, which may increase the process or make drawing into the final shape difficult.

At the time of the third drawing, the outer forming mold 10 to be applied, as shown in (b) of Figure 3, the angle (degree) is formed, it is preferably formed at an angle of 14 ~ 16 °.

In the third drawing, when the angle of the outer periphery forming mold 10 to be applied is less than 14, the deformation amount is insufficient, so that the deformation process to the final shape may be long or the deformation to the final shape may not be easy. When the angle exceeds 16, due to the excessive deformation amount, surface defects may be formed.

In the fourth drawing, the outer forming mold 10 to be applied, like the outer forming mold 10 applied in the third drawing, the angle is formed, it is formed at an angle of 11 ~ 13 ° It is preferable.

In the fifth drawing, the outer forming mold 10 to be applied, like the outer forming mold 10 applied in the third drawing, is formed with an angle, and is formed at an angle of 11 to 13 °. It is preferable.

The reason why the angular range of the outer circumferential forming mold 10 to be applied during the fourth and fifth drawing is formed, like the outer circumferential forming mold 10 to be applied during the third drawing, below the preset angular range. This is because, when forming, the amount of deformation is insufficient, so that the number of processes and the processing time increase, so that the efficiency decreases, and when forming beyond the above angular range, surface defects may occur.

In addition, the inner circumferential forming mold 20 has a constant gap with the outer circumferential forming mold 10, as shown in FIG. 4A, during the first, third, fourth and fifth drawing. It is desirable to be provided.

When the secondary drawing, the inner circumferential forming mold 20 is applied, as shown in (b) of FIG. 4, when forming the following protrusion section 30 which is represented as a complex shape, 1/1 of the actual bending depth The inner circumferential protrusion section forming portion 21 is provided in a shape of less than 3 to 1/2 size.

This, when the secondary drawing, for the first time, the following protrusion section 30 is formed, wherein, the following protrusion section 30 is formed in the outer circumferential protrusion section (11) finely formed in the outer circumferential forming mold (10) This is to induce a deformation naturally occurs.

As described above, when the protrusion section 30 is formed through the secondary drawing for the first time, the frame is excessively formed by the outer circumferential forming mold 10 and the inner circumferential forming mold 20, and the steel pipe ( If A) is deformed, it may not be able to withstand bending (deformation) in the reverse direction (inward direction), and may cause a large deformation or surface distortion.

The molding of the protrusion section 30 generated during the second drawing is the portion in which the highest load is formed in the drawing process according to the second step. As described above, the actual bending depth (protrusion section) may be reduced so as to reduce the load. It is preferable that the inner circumferential protrusion section forming portion 21 is provided in a form of less than 1/3 to 1/2 of the size.

Next, the third step (S30), to correct the straightness of the steel pipe (A) drawn through the second step (S20).

Specifically, in the third step (S30), the steel pipe is calibrated through a roll (not shown).

The roll (not shown) may be provided in multiple stages continuously on the horizontal plane from which the steel pipe (A) is drawn out, and is provided on the top and bottom and both sides to pass the steel pipe (A) therebetween.

The roll (not shown) may control the straightness of the steel pipe A drawn out through the second step S20 on a predetermined basis.

The control of the straightness may be selectively performed, but at the same time as the drawing is performed, correction by the roll (not shown) is performed, so that the rigidity of the steel pipe A is effectively set to a predetermined level of straightness. Can be corrected.

In addition, it is possible to prevent the phenomenon of distortion inevitably generated in the drawn steel pipe (A).

Accordingly, the process can be simplified to increase the process efficiency.

Next, in the fourth step S30, the steel pipe A is calibrated through the third step S30. In the fourth step S30, the third step S20 is performed. As long as it can effectively cut the corrected steel pipe (A) can be configured in any form.

Next, the fifth step (S40), after the heat treatment of the steel pipe (A) cut through the fourth step (S30), and quenched to form a beam reinforcement.

At this time, the beam reinforcing material, the cross section is formed that the closed section is formed, it is provided so that one or more projection section 30 in the inner circumferential surface direction.

Specifically, the fifth step (S40), it comprises a 4-1 step of performing a heat treatment on the steel pipe (A) and a 4-2 step of performing quenching using a mold.

First, in step 4-1, heat treatment is performed on the steel pipe A cut through the fourth step S30.

During the heat treatment, the steel pipe (A) is heat-treated for 3 to 5 minutes at 800 ~ 900 ℃.

This is to uniformize the microstructure of the steel pipe (A), to austenitize the microstructure for the dissolution of dissolved carbon, and after heat treatment under the above conditions, when quenching through the following 4-2 step, fine This is because complete martensite transformation can occur in the tissue, and the strength can be greatly increased.

When the temperature and time conditions are out of the above ranges, complete carbon solid solution and austenitization of the microstructure cannot be performed, and thus, quenching does not completely generate martensite transformation.

Next, the step 4-2, through the mold (die) is provided to the final shape of the heat-treated steel pipe (A) through the step 4-1 performs a conventional quenching.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

Claims

A first step in which a steel pipe is prepared;

A second step of drawing the steel pipe into a predetermined cross-sectional shape;

A third step of correcting the straightness of the steel pipe drawn through the second step;

A fourth step of cutting the steel pipe drawn through the third step;

And a fifth step of forming a beam reinforcing material by quenching the steel pipe cut through the fourth step and then quenching it.

The beam reinforcement,

A method for manufacturing and calibrating a high strength beam reinforcement having a closed section, characterized in that a complex shape is formed by forming one or more protrusion sections in a central axis direction and an outward direction based on a cross-sectional shape perpendicular to the longitudinal direction.
The method of claim 1,

In the second step,

The high-strength beam reinforcement is formed in the closed section, characterized in that the drawing process is carried out continuously so that the deformation can be carried out five times, and the initial drawing is carried out in the form of an ellipse that forms the same cross-sectional area. Method of preparation and calibration.
The method of claim 2,

In the drawing process, the drawing mold,

An outer circumferential forming mold provided with a mold in which a workpiece is formed in contact with an inner circumferential surface to form an outer circumferential surface formed as the steel pipe is drawn, and a hole is formed to be processed;

And an inner circumferential forming mold provided with a mold in a form in which the workpiece is contacted to the outside so as to form an inner circumferential surface formed as the steel pipe is drawn.

When drawing the second time, the outer mold forming mold,

Method for producing and calibrating a high-strength beam reinforcing member is formed a closed section characterized in that the projection section is formed by 1/3 to 1/2 lower than the depth of the projecting section of the beam reinforcement is formed.
The method of claim 1,

In the third step,

A method of manufacturing and calibrating high-strength beam reinforcement, in which a closed section is formed, wherein straightness is corrected by passing the steel pipe between rolls provided in multiple stages on a horizontal plane.