WO2023113455A1

WO2023113455A1 - Impact reinforcement component and method for manufacturing same

Info

Publication number: WO2023113455A1
Application number: PCT/KR2022/020308
Authority: WO
Inventors: 이홍우; 김돈건; 김휘건
Original assignee: 주식회사 포스코
Priority date: 2021-12-15
Filing date: 2022-12-15
Publication date: 2023-06-22
Also published as: KR20230090587A

Abstract

An impact reinforcement component according to the present invention comprises a component body having side walls formed on both longitudinal sides thereof and a top plate connecting the upper ends of the two side walls; and end flanges formed by being bent at respective longitudinal ends of the component body, wherein the component body, formed by repeated roll stamping in succession through which material is rotatingly pressed multiple times by means of stamping rolls, comprises: a body portion having beads formed along the top plate in the longitudinal direction; and boundary portions which are integrated with the body portion and respective end flanges, being the connecting portions therebetween, and have a flat top plate.

Description

Crash reinforcement parts and manufacturing method thereof

The present invention relates to a crash-reinforcing part and a manufacturing method thereof, such as a seat cross member, in which rigidity is reinforced for crash preparation, and a manufacturing method thereof.

Roll stamping technology is explained in the previously registered patents Roll Stamping Device (Registration No. 10-1417278), Roll Stamping Device (Registration No. 10-1786260), and Roll Stamping Device and Method (Registration No. 10-1917450). It is a technology that

The core of roll stamping technology is to manufacture parts having a shape whose cross section changes in the longitudinal direction using a roll forming device.

However, it is impossible to manufacture a part having a shape change in the longitudinal direction by a conventional roll forming method. Therefore, it is common to manufacture by press molding using a mold. However, when the strength of the material is high, it is not easy to manufacture because a very high press capacity is required to mold large-sized parts.

Therefore, roll stamping is a useful technique that can solve these limitations. However, since roll stamping is basically a technology using a roll forming device, it is not easy to apply it in practice when a very long part has a shape change in the longitudinal direction. That is, since the longitudinal shape of the part must be engraved around the stamping roll, the diameter of the stamping roll must be increased when the length of the part is long. In practical terms, it is difficult to apply.

The present invention was invented to solve the above problems, and provides a collision-reinforcing part that can be manufactured by a roll stamping method without increasing the diameter of a stamping roll when manufacturing parts with a long material and a manufacturing method thereof. There is a purpose.

In order to achieve the above object, a collision-reinforcing part according to the present invention includes a component body having side walls formed on each side in the longitudinal direction and a top plate connecting the upper ends of the side walls on both sides; and end flanges bent at both ends of the component body in the longitudinal direction, wherein the component body is formed by continuous repetition of roll stamping in which a stamping roll rotates and presses a material a plurality of times, and the component body is formed on the upper plate. A body portion having a bead formed along the longitudinal direction; and a boundary portion integral with the body portion and the end flange as a joint between the body portion and the end flange and having a flat upper plate.

Here, the body portion may include a plurality of bead regions spaced apart from each other in a longitudinal direction and having the bead formed on the upper plate; and a middle no bead region located between the plurality of bead regions and having a flat upper plate.

In this case, in the bead area, a plurality of beads may be disposed spaced apart from each other in the width direction of the upper plate.

In addition, the longitudinal length of the middle nobead region may be equal to or greater than twice the sum of the boundary portion and the end flange in the longitudinal direction.

On the other hand, according to another aspect of the present invention, the roll stamping step of continuously repeating the roll stamping by pressing the stamping roll a plurality of times along the longitudinal direction of the material; and a flange forming step of bending both ends of the material to form end flanges, wherein in the roll stamping step, a plurality of bead regions are formed in the material, and an intermediate no bead region is formed between the plurality of bead regions, , A method of manufacturing a collision-reinforcing part is provided in which an end nobead region is formed at each of both ends.

Specifically, the roll stamping step may include a total bending step of forming both side walls and an upper plate by bending the material while pressing and rotating the stamping roll on the material a plurality of times; a first end nobead process of forming a flat upper plate at one end of the material in the longitudinal direction to form the end nobead region; a bead process of forming a plurality of bead regions by forming a plurality of beads spaced apart from each other in a longitudinal direction on an upper plate of the material; an intermediate no bead process of forming the intermediate no bead region by forming a flat upper plate between the plurality of beads; and a second end nobead process of forming the end nobead region by forming a flat upper plate on the other end of the material in the longitudinal direction, wherein the first end nobead process, the bead process, the middle nobead process, and the second end nobead process The no bead process may be performed during the entire bending process, and the middle part no bead process may be performed during the bead process.

At this time, the length in the longitudinal direction of the middle nobead region formed by the middle nobead process is twice the length in the longitudinal direction of the end nobead region formed by the first end nobead process or the second end nobead process, and It can be equal to or greater than twice.

In the collision-reinforcing part according to the present invention, a part body is formed by continuous repetition of roll stamping in which a stamping roll rotates and presses a material a plurality of times, so that a bead region is formed in the body of the component body, and the boundary portion having the no bead region is the body. As it is composed of an integral structure extending from the part and leading to the end flange, the stiffness can be reinforced by the bead area of the body part, and at the same time, the bending deformation of the end flange is smoothly and easily formed by the no bead area of the boundary part. .

In addition, the method for manufacturing a crash-reinforcing part according to the present invention comprises a roll stamping step of continuously repeating roll stamping by rotating and pressing a stamping roll a plurality of times along the longitudinal direction of the material, so that the shape change in the longitudinal direction is periodically repeated. While configuring the parts as much as possible, very long parts can be manufactured without increasing the diameter of the stamping roll, and it has the advantage that the above-mentioned boundary can be easily formed.

1 is a view showing a seat cross member according to the prior art.

2 is a view showing a crash-reinforcing part according to the present invention.

3 is an enlarged view showing A of FIG. 2 .

4 is an enlarged view showing B of FIG. 2 .

5 is a flowchart showing a method of manufacturing a crash-reinforcing part according to the present invention.

6 is a flow chart showing a roll stamping step in the manufacturing method of the crash reinforcement part of FIG.

Hereinafter, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and actions. In addition, in the present specification, terms such as 'upper', 'upper', 'top', 'lower', 'lower', 'lower', 'side' are based on the drawings, and components are actually arranged It may vary depending on which direction it is going.

In addition, throughout the specification, when a part is said to be 'connected' to another part, it is not only 'directly connected', but also 'indirectly connected' with other components in between. Also includes In addition, 'including' a certain component means that other components may be further included, rather than excluding other components unless otherwise stated.

1 is a view showing a seat cross member according to the prior art.

Referring to the drawings, the seat cross member 10 is configured as a reinforcement part in preparation for a collision in a vehicle, that is, a crash reinforcement part at the lower part of the vehicle.

This seat cross member 10 has a hat-shaped cross section and is composed of one unit part.

Such a seat cross member 10 can be manufactured by roll forming as there is no change in cross-sectional shape along the longitudinal direction. That is, it is possible to weld to the seal side 20 by creating flanges 11 at both ends of the roll-formed part through post-processing.

However, there is a limitation in that reinforcement against collision is insufficient by the structure formed of only both side walls 10a and the flat top plate 10b.

In order to overcome this limitation, although not shown in the drawing, a seat cross member including a bead (a relatively raised portion compared to other portions) on the top plate may be manufactured.

However, when beads are formed along the longitudinal direction of the entire upper plate, that is, when beads are formed long to both ends in the longitudinal direction, it is very difficult to create a flange that is bent and deformed during the manufacturing process.

In other words, as the end of the seat cross member is not a simple hat-shaped cross section, but has a complex cross-sectional shape with a cross-sectional edge that is bent (bent) several times due to the bead, it is quite difficult to bend the end to create a flange. will lose

Therefore, in order to form a simple hat-shaped cross-sectional structure without beads only at the end of the seat cross member, the seat cross member is composed of a plurality of unit parts instead of one unit part. That is, a seat cross member can be made by connecting (welding, etc.) a unit part having a bead structure and a separate unit part having a simple hat-shaped cross-section structure without a bead.

However, in the case of a simple model cross-section structure without a bead at the end, it is easy to create a flange by bending the end, but when a sheet cross member is made by combining a plurality of non-integral unit parts, the unit parts are connected to each other. As the rigidity of the part (welded part as an example) is relatively low compared to other parts, there is a problem in using it as a crash reinforcement part.

2 is a view showing a collision-reinforcing part according to the present invention, FIG. 3 is an enlarged view showing A in FIG. 2, and FIG. 4 is an enlarged view showing B in FIG.

Referring to the drawings, the collision reinforcing part 1000 according to the present invention has a simple cross-sectional structure without a bead (a relatively upwardly raised part compared to other parts) at the end in order to solve the above-described problem (120). ) is configured, and this boundary portion 120 is composed of an integral structure rather than a separate member from other parts.

Specifically, the present invention includes a component body 100 and an end flange 200.

The component main body 100 is formed by continuous repetition of roll stamping in which a stamping roll rotates and presses a material on a plurality of times.

The component body 100 manufactured through this method structurally has a side wall (S) formed on each side in the longitudinal direction, and a top plate (U) connecting the upper ends of the side walls (S) on both sides.

And, the end flange 200 is formed by bending each of both ends in the longitudinal direction of the component body 100. This end flange 200 is a part that is welded to other parts such as silicide as an example.

Here, the component body 100 includes a body portion 110 and a boundary portion 120.

The body portion 110 has a bead 111a formed along the longitudinal direction of the top plate U.

In addition, the boundary portion 120 is a joint between the body portion 110 and the end flange 200 and is integral with the body portion 110 and the end flange 200.

At this time, the upper plate U of the boundary portion 120 has a flat structure in which no beads are formed. The boundary portion 120 is a portion substantially short in length, and is the same portion as the boundary line between the body portion 110 and the end flange 200.

More specifically, the body portion 110 includes a bead region 111 and a middle no bead region 112 .

A plurality of bead regions 111 are spaced apart from each other in the longitudinal direction, and beads 111a are formed on the top plate U. That is, the bead region 111 is formed long in the longitudinal direction, and since the middle nod bead region 112 is located in the middle, a plurality of bead regions 111 are spaced apart from each other. As an example, as shown in the drawing, two may be disposed spaced apart from each other.

As described above, the plurality of bead regions 111 spaced apart in the longitudinal direction are formed by being manufactured by roll stamping as described in the component manufacturing method to be described later. That is, as the stamping roll rotates and presses the material a plurality of times, a plurality of beads 111a are formed to be spaced apart in the longitudinal direction.

Furthermore, as for the bead region 111, a plurality of beads 111a may be spaced apart from each other in the width direction of the upper plate U. In this way, when a plurality of bead regions 111 are arranged spaced apart in the width direction, the rigidity of the collision reinforcing part 1000 is increased.

In addition, the middle no bead region 112 is located between the plurality of bead regions 111 and the upper plate U has a flat structure.

As described above, the body portion 110 has bead regions 111 spaced apart from each other in the longitudinal direction, and between the plurality of bead regions 111 that are spaced apart in this way, the upper plate U is a flat middle no bead region. (112) is formed.

The stamping roll has a concavo-convex structure to form the bead 111a, and has a flat portion to form the boundary portion 120. In the case of having a size (diameter), in order to manufacture a long collision-reinforcing part 1000, rotational pressure is applied multiple times to form a middle no bead region 112 in which the top plate U is flat like the boundary portion 120. .

That is, due to the same structure as the middle nobead region 112, the collision reinforcing part 1000 of the present invention can be implemented through a manufacturing method by pressing a plurality of rotations of a stamping roll.

In addition, the boundary portion 120 is located at both ends of the component body 100 in the longitudinal direction, and the upper plate U is a flat portion and is the same as the boundary line between the body portion 110 and the end flange 200, and the end The flange 200 can be formed smoothly and easily during bending.

The end flange 200 takes a structure that integrally extends from the boundary portion 120 before being bent, and the boundary portion 120 takes a simple hat-shaped cross-sectional structure without a bead, thereby bending the end flange 200. Deformation can be made smoothly and easily.

As described above, according to the manufacturing method of the present invention using a stamping roll rotating a plurality of times, the longitudinal length of the middle nobead region 112 is twice the length of the sum of the boundary portion 120 and the end flange 200. structure equal to or greater than twice that of

When manufacturing a plurality of collision-reinforcement parts 1000 having a set length with a long material, the material is roll-stamped and then cut and divided so that the plurality of collision-reinforcement parts 1000 can be formed, so that the middle nobead area The length of (112) should be twice the sum of the end flange 200 and the border portion 120, which is the end nod bead area 121 where the top plate U is flat, and the end flange sufficient so that a portion may be lost during cutting ( 200), a condition greater than twice may be taken in consideration of forming.

5 is a flow chart showing a method for manufacturing a crash-reinforcing part according to the present invention, and FIG. 6 is a flow chart showing a roll stamping step in the method for manufacturing a crash-reinforcing part in FIG. 5 .

Referring to FIGS. 5 and 6 based on FIGS. 2 to 4 , the method for manufacturing a crash-reinforcing part according to the present invention includes a roll stamping step (S100) and a flange forming step (S200).

The roll stamping step (S100) is a step in which roll stamping is continuously repeated by rotating and pressing a stamping roll a plurality of times along the longitudinal direction of the material.

In addition, the flange forming step (S200) is a step that proceeds after the roll stamping step (S100), and is a step of forming the end flange 200 by bending each of both ends of the material.

When manufacturing a collision-reinforcing part such as a seat cross member with a material having a long shape in the longitudinal direction, the product is completed through the roll stamping step (S100) and the flange forming step (S200).

Here, in the roll stamping step (S100), a plurality of bead regions 111 are formed on the material, and intermediate nobead regions 112 are formed between the plurality of bead regions 111, and end nobead regions 121 are formed at both ends, respectively. ) is formed.

Specifically, the roll stamping step (S100) includes a full bending process (S110), a first end nobead process (S120), a bead process (S130), a middle part nobead process (S130), and a second end nobead process (S150). includes

In the entire bending process (S110), the material is bent while pressing and rotating the stamping roll a plurality of times to form the side walls (S) and the upper plate (U) on both sides.

In addition, in the first end nobead process (S120), the end nobead region 121 is formed by forming a flat upper plate U at one end of the material in the longitudinal direction.

In the bead process (S130), a plurality of bead regions 111 are formed by forming a plurality of beads 111a spaced apart from each other in the longitudinal direction on the upper plate U of the material.

In addition, in the intermediate nobead process (S130), a flat upper plate U is formed between the plurality of beads 111a to form the intermediate nobead region 112.

In addition, in the second end nobead process (S150), the end nobead region 121 is formed by forming a flat upper plate U at the other end in the longitudinal direction of the material.

At this time, the first end nobead process (S120), the bead process (S130), the middle part nobead process (S130), and the second end nobead process (S150) are performed during the entire bending process (S110), and the middle part nobead process (S130) is made in the course of the bead process (S130).

That is, in the process of forming the side walls (S) and the top plate (U) on the material while the stamping roll rotates and presses the material a plurality of times, the first end nod process (S120), the bead process (S130), and the second step are sequentially performed. An end nobead process (S150) is performed, and at this time, a middle part nobead process (S130) is performed during the bead process (S130). In other words, the first end nobead process (S120), the bead process (S130), the middle part nobead process (S130), and the second end nobead process (S150) are performed while the stamping roll rotates and presses the material a plurality of times. .

Then, in the flange forming step (S200), the end flange 200 is formed by bending the end nod bead region 121 having a flat upper surface after the roll stamping step (S100).

Meanwhile, the length of the middle nobead region 112 in the longitudinal direction may be equal to or greater than twice the length of the end nobead region 121 in the longitudinal direction.

When manufacturing a plurality of collision-reinforcing parts 1000 having a set length with a long material, the material is roll-stamped in the roll stamping step (S100) and then cut and divided so that the plurality of collision-reinforcing parts 1000 can be formed. Therefore, the length of the middle nobead region 112 must be twice the length of the end nobead region 121 where the top plate U is flat, and to form the end flange 200 sufficient to allow a portion to be lost during cutting. Consideration may be given to conditions greater than two times.

As a result, in the collision-reinforcing part 1000 according to the present invention, the part body 100 is formed by continuous repetition of roll stamping in which the stamping roll rotates and presses the material a plurality of times, so that the body portion 110 of the part body 100 ), the bead area 111 is formed, and the boundary portion 120 having the no bead area extends from the body portion 110 to the end flange 200, and is configured as an integral structure, so that the bead area of the body portion 110 The rigidity can be reinforced by 111, and at the same time, the bending deformation of the end flange 200 can be smoothly and easily formed by the no bead area of the boundary portion 120.

In addition, the method for manufacturing a collision-reinforcing part according to the present invention includes a roll stamping step (S100) of continuously repeating roll stamping by rotating and pressing a stamping roll a plurality of times along the longitudinal direction of the material, thereby changing the shape in the longitudinal direction. By configuring the part to be repeated periodically, a very long part can be manufactured without increasing the diameter of the stamping roll, and the above-described boundary portion 120 can be easily formed.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains will realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

(Description of code)

100: part body 110: body part

111: bead area 111a: bead

112: middle nobead area 120: boundary

121: end nobead area 200: end flange

1000: crash reinforcement part S: side wall

U: top plate S100: roll stamping step

S110: Full bending process S120: First end nobead process

S130: Bead process S140: Intermediate bead process

S150: Second End Nobead Process S200: Flange Forming Step

Claims

a component body having side walls formed on each side in the longitudinal direction and a top plate connecting upper ends of the side walls on both sides; and

Including; end flanges bent at both ends of the component body in the longitudinal direction, respectively,

The component main body is formed by continuous repetition of roll stamping in which a stamping roll rotates and presses a material on a plurality of times,

The part body,

A body portion having a plurality of beads formed along the longitudinal direction of the top plate; and

a boundary portion integral with the body portion and the end flange as a joint between the body portion and the end flange, and having a flat upper plate;

Collision-reinforcing parts comprising a.
According to claim 1,

The body part,

A plurality of bead regions spaced apart from each other in the longitudinal direction and the beads formed on the upper plate; and

A collision-reinforcement component comprising: a middle nod bead region positioned between the plurality of bead regions and having a flat upper plate.
According to claim 2,

The bead region is a collision-reinforcing component in which a plurality of beads are spaced apart from each other in the width direction of the upper plate.
According to claim 2,

The longitudinal length of the middle nobead region is equal to or greater than twice the longitudinal length of the sum of the boundary portion and the end flange.
A roll stamping step of continuously repeating roll stamping by rotating and pressing a stamping roll a plurality of times along the longitudinal direction of the material; and

Including; a flange forming step of bending each of the both ends of the material to form an end flange,

In the roll stamping step,

A method of manufacturing a collision-reinforcing part in which a plurality of bead regions are formed on the material, intermediate nobead regions are formed between the plurality of bead regions, and end nobead regions are formed at both ends, respectively.
According to claim 5,

The roll stamping step,

a total bending process of forming side walls and an upper plate on both sides by bending the material while pressing and rotating the stamping roll on the material a plurality of times;

a first end nobead process of forming a flat upper plate at one end of the material in the longitudinal direction to form the end nobead region;

a bead process of forming a plurality of bead regions by forming a plurality of beads spaced apart from each other in a longitudinal direction on an upper plate of the material;

an intermediate no bead process of forming the intermediate no bead region by forming a flat upper plate between the plurality of beads; and

A second end nobead process of forming a flat upper plate at the other end of the material in the longitudinal direction to form the end nobead region;

The first end nobead process, the bead process, the middle part nobead process, and the second end nobead process are performed during the entire bending process, and the middle part nobead process is performed during the bead process. Manufacturing method of a crash reinforcement part.
According to claim 6,

The longitudinal length of the middle nobead region formed by the middle nobead process is equal to twice the longitudinal length of the end nobead region formed by the first end nobead process or the second end nobead process, or A method for manufacturing a crash-reinforced part that is larger than two times.