KR101767769B1

KR101767769B1 - Roll forming member

Info

Publication number: KR101767769B1
Application number: KR1020150183814A
Authority: KR
Inventors: 김돈건
Original assignee: 주식회사 포스코
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2017-08-14
Also published as: KR20170075084A

Abstract

The present invention provides a roll forming apparatus comprising: a roll forming body forming at least one closed end face portion; And a connecting joint provided at at least one end of the roll forming body and coupled to the structural member, wherein the roll forming body and the connecting joint are integrally formed by a roll forming method, Wherein the roll forming body includes a first connecting joint portion provided at one side of the roll forming body and a second connecting joint portion provided at the other side of the roll forming body so as to face the first connecting joint portion, Wherein the roll forming member is continuously formed by a roll forming method in an interval between the joining portion and the second joining joining portion and is formed by overlapping even-numbered closed end portions.

Description

[0001] ROLL FORMING MEMBER [0002]

The present invention relates to a roll forming member, and more particularly, to a roll forming member capable of exhibiting high strength at low cost.

It should be noted that the contents described in this section merely provide background information on the present invention and do not constitute the prior art.

As shown in Fig. 1, a closed end portion of a structural member is formed by a method of forming two welded portions W by forming two press members P and welding flanges formed at both ends of the press member by welding Respectively.

When such a structural member is manufactured by the conventional press method, there is a problem that the cross-section of the structural member becomes excessive in order to secure sufficient load performance. Even if the cross-sectional size is enlarged, There is no disadvantage.

In addition, when the structural member is manufactured by the conventional press forming method, there is a problem in that the manufacturing cost is increased due to the excessive cross-section, thereby making it difficult to secure economical efficiency.

Also, although a method of manufacturing using a method such as hot press forming (HPF) has been considered, there is a problem that a manufacturing cost of the hot press forming (HPF) method is excessively increased.

Therefore, it is possible to produce a structural member by a roll forming method which can produce a product with a high dimensional accuracy, scarcely occurring, very little wear of the roll, a cross-sectional shape and a relatively long product, There is a need to review.

The present invention is realized by recognizing at least any one of the requirements or problems generated in the conventional roll forming member.

In one aspect, the present invention provides a roll forming member capable of reducing a manufacturing cost while improving a load performance by applying a closed end face structure.

As one aspect, the present invention aims to provide a roll forming member which can be easily combined with a structural member while minimizing the amount of use of the steel sheet, thereby reducing costs.

According to one aspect of the present invention, there is provided a roll forming apparatus comprising: a roll forming body forming at least one closed end face portion; And a connecting joint provided at at least one end of the roll forming body and coupled to the structural member, wherein the roll forming body and the connecting joint are integrally formed by a roll forming method, Wherein the roll forming body includes a first connecting joint portion provided at one side of the roll forming body and a second connecting joint portion provided at the other side of the roll forming body so as to face the first connecting joint portion, Wherein the roll forming member is continuously formed by a roll forming method in an interval between the joining portion and the second joining joining portion and is formed by overlapping even-numbered closed end portions.

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Preferably, the roll-forming body includes a first closed end face portion formed continuously by a roll forming method in a section between the first connection joint portion and the second connection joint portion and having an 8-shaped cross section, .

According to another aspect of the present invention, there is provided a roll forming apparatus comprising: a roll forming body forming at least one closed end surface portion; And a connecting joint provided at at least one end of the roll forming body and coupled to the structural member, wherein the roll forming body and the connecting joint are integrally formed by a roll forming method, Wherein the roll forming body includes a first connecting joint portion provided at one side of the roll forming body and a second connecting joint portion provided at the other side of the roll forming body so as to face the first connecting joint portion, A first body plate extending from the junction; A second body plate extending from the second connection joint; A first closed end surface connected to the first body plate and continuously roll-formed; And a second closed end surface portion having one side connected to the first closed end surface portion and the other side connected to the second main plate and continuously roll-formed.

Preferably, the body plate and the member forming the closed end face portion can be overlapped welded at least at two or more of the overlapping portions.

Preferably, the connection joint and the boundary of the closed end closest to the connection joint can be welded.

Preferably, at least the roll forming body of the roll forming body and the connecting joint may be made of any one material selected from martensitic steel, CP steel, DP steel, TRIP steel and TWIP steel having a strength of 980 MPa or more .

Preferably, the roll-forming body forms a plurality of closed end face structures including a plurality of closed end faces formed in a triangular or quadrangular cross-section.

Preferably, the connecting joint may be partially formed at a portion of both longitudinal ends of the roll forming body.

As described above, according to one embodiment of the present invention, the closed end structure is applied to improve the load performance, reduce the amount of steel used and the amount of welding to improve the production speed of the roll forming member, The welding amount can be reduced and the manufacturing cost of the roll forming member can be reduced.

According to an embodiment of the present invention, the roll forming body and the connecting joint are continuously formed by a single roll forming process to form a closed end structure for exhibiting load performance, and at the same time, The manufacturing process can be simplified and the manufacturing cost can be reduced.

1 is a view showing a conventional roll forming member.
2 is a perspective view showing a roll forming member according to an embodiment of the present invention.
3 is a perspective view showing a roll forming member according to another embodiment of the present invention.
4 is a cross-sectional view of a roll forming member according to an embodiment of the present invention.
5 is a cross-sectional view of a roll forming member according to another embodiment of the present invention.
Fig. 6 is a cross-sectional view of the conventional roll-forming member shown in Fig. 1 and the cross-section of the roll-forming member of the present invention shown in Fig.
Fig. 7 is a cross-sectional view of the conventional roll-forming member shown in Fig. 1 and the mounting area of the roll-forming member of the present invention shown in Fig. 4;
8 is a cross-sectional view of a roll forming member according to another embodiment of the present invention.
9 to 12 are views showing a roll forming member of the present invention having various embodiments.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Hereinafter, the roll forming member 10 according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, a roll forming member 10 according to an embodiment of the present invention may include a roll forming body 100 and a connecting joint 200.

2, the roll forming member 10 includes a roll forming body 100 in which at least one closed end face portion 110 is formed, and at least one end of the roll forming body 100, And a connection joint 200 coupled to the member 1. The roll forming body 100 and the connection joint 200 can be continuously formed.

The connection joint 200 may be formed at both ends of the roll forming body 100. At this time, the structural member 1 may be installed at both ends of the roll forming body 100 via the connecting joint portion 200.

The connection joint 200 may be formed at one end of the roll forming body 100. At this time, the structural member 1 may be installed only at one end of the roll forming body 100.

The roll forming body 100 and the connecting joint portion 200 constituting the roll forming member 10 can be formed into a member having a desired shape while the steel sheet is folded in multiple stages in the cross section by the roll forming apparatus.

As shown in FIGS. 2 and 3, the roll forming body 100 and the connecting joint 200 can be continuously formed by a single roll forming process.

In the case of FIG. 3, both end portions of a sheet material such as a steel sheet forming the joining portion 200 and the roll forming body 100 are cut in advance, and the joining portion 200 is partially formed, The roll forming member 10 and the connecting joint 200 can be continuously formed.

The steel sheet can be continuously formed by a single roll forming process while sequentially performing roll forming in the order of the first connecting joint portion 210 and the roll forming body 100 and the second connecting joint portion 230 without the steel sheet being disconnected.

The roll forming process is a process that can produce a product with a high dimensional precision, scarcely scarcely occurred, very little wear on the roll, a cross-sectional shape, and a relatively long length in a very economical manner.

In the roll forming process, a plurality of fixed upper and lower rotary roll sets are arranged, and each time a coil or a cut material passes between the rotary roll sets, the part shape is gradually formed, Molding technology.

Particularly, since it can be molded to ultrahigh strength steel, it has a merit of being suitable for the production of high strength steel automobile parts.

As shown in FIGS. 2 and 3, the connection joint 200 may include a first connection joint 210 and a second connection joint 230.

The connection joint part 200 includes a first connection joint part 210 provided on one side of the roll forming body 100 and a second connection joint part 210 provided on the other side of the roll forming body 100 so as to face the first connection joint part 210 And a second connection joint 230.

The roll forming body 100 is continuously formed by a roll forming method in a section between the first connecting joint portion 210 and the second connecting joint portion 230 to form an even number of closed end face portions 110 can do.

At this time, the closed end face portion 110 may be formed continuously, and the adjacent closed end face portions may be formed to be in contact with each other.

The roll-forming body 100 and the connecting joint 200 may be integrally formed by a single roll-forming process. The roll-forming body 100 may have an even number of closed end portions 110 formed therein.

4 to 5, in order to form the connecting joint 200 at both ends of the roll forming body 100 while the roll forming body 100 is roll-formed integrally with the connecting joint 200, (110) should be provided in an even number.

This is because when the odd number of closed end face portions 110 are continuously formed in the roll forming body 100, the connecting joint portions 200 can not be formed opposite to both sides of the roll forming body 100, .

Thus, while forming the two connecting joints 200 in opposing shapes for engaging the structural member 1 in the roll-forming body 100, the connecting joints 200 allow the roll-forming bodies 100 to have a single roll- In order to be integrally formed by the process, the closed end face portions 110 must be provided in an even number.

The roll forming member 10 according to the present invention is formed by forming a roll forming body 100 having a closed end face structure on both sides of a roll forming body 100, There is an advantage that a part can be formed by a single roll forming process.

Therefore, the roll forming member 10 of the present invention improves the load performance through the closed end structure, reduces the amount of welding, improves the production speed of the roll forming member 10, 10) can be reduced.

In addition, the roll forming member 10 of the present invention forms a closed end portion structure for exerting the load performance and at the same time forms a connecting body portion which is opposed to both side faces of the roll forming body 100, It is possible to minimize the use of the steel sheet for the production of the structural member 1 and to easily combine with the structural member 1 while reducing the cost.

The roll forming body 100 can form an eight-shaped cross section in which two closed end face portions 110 are continuously formed by a roll forming method.

4 (a), the roll forming body 100 is continuously formed by a roll forming method in a section between the first connecting joint portion 210 and the second connecting joint portion 230, A first closed end face portion 111 having an eight-shaped cross section, and a second closed end face portion 112. [

As shown in Fig. 4 (a), two joints can be welded for joining the first joint joining portion 210, the roll forming body 100 and the second joining body portion which are continuously roll-formed.

As described above, the first joining joint 210, the roll forming body 100, and the second joining body are welded at two places in order to join the first joining joint 210, the second joining body 200, Forming body 100 having a plurality of closed end face structures, and a connecting body portion having a shape opposite to both sides of the roll-forming body 100 can be formed.

Therefore, the roll forming member 10 of the present invention improves the load performance through a plurality of closed end face structures, reduces the welding amount and improves the production speed of the roll forming member 10, The manufacturing cost of the member 10 can be reduced.

In addition, the roll forming member 10 of the present invention is formed with a plurality of closed end face structures for exerting the load performance, and at the same time, a connecting body portion which is opposed to both side faces of the roll forming body 100 is formed, It is possible to minimize the amount of the steel sheet used for manufacturing the steel sheet 10 and to easily combine with the structural member 1 while reducing the cost.

5 and 6, the roll forming body 100 includes a first body plate 130, a second body plate 150, a first closed end face portion 111, and a second closed end face portion 112 ).

The connection joint part 200 includes a first connection joint part 210 provided on one side of the roll forming body 100 and a second connection joint part 230 provided on the other side of the roll forming body 100 The roll forming body 100 includes a first body plate 130 extending from the first connection joint 210 and a second body plate 130 extending from the second connection joint 230, A first closed end surface portion (111) connected to the first main body plate (130) and continuously rollformed; And a second closed end face portion 112, one side of which is associated with the first closed end face portion 111 and the other end which is in continuous casting in conjunction with the second body plate.

The first closed end face 111 and the second closed end face 112 may be continuously formed while being formed between the first body plate 130 and the second body plate 150 in cooperation with each other.

The roll forming body 100 may form multiple closed end face structures including a plurality of closed end faces 110 formed in a triangular or quadrangular cross section.

4, the first closed end face 111 and the second closed end face 112 may have a rectangular cross-section, and may have a curvature in a corner portion of a rectangular cross-section. .

5A, the first closed end face 111 and the second closed end face 112 may be formed in a triangular cross-section, and corner portions of the triangular cross-section may have a predetermined curvature .

However, it is needless to say that the shape of the closed end face 110 is not limited to a triangle or a quadrangle, but may have various shapes of polygonal cross-sections as long as the load-carrying performance of the roll forming member 10 can be improved.

5 (b), the first closed end face portion 111, the second closed end face portion 112, the third closed end face portion 113, and the fourth closed end face portion 114 are formed in a rectangular cross section And the corner portion of the rectangular cross section may be provided in a shape having a constant curvature.

5A shows two closed end faces 110, and FIG. 5B shows four closed end faces 110. As shown in FIG. They are different from each other in terms of the load performance of the roll forming member 10 and the production cost in accordance with the amount of steel used.

5 (a) shows a plurality of closed end face structures including two closed end faces 110 to minimize the amount of steel used and the amount of welding, while ensuring sufficient load performance, The shape of the optimal roll forming member 10 of the present invention reduced to the manufacturing cost.

On the other hand, FIG. 5 (b) shows that the closed end face structure is formed by forming the four closed end face portions 110, so that the manufacturing cost such as the amount of steel used is increased compared to FIG. 5 (a) Has an advantage of being improved.

In the case of FIG. 5 (b), there is also almost no change in the cross-sectional area occupied by the roll forming member 10 and the structural member 1.

Therefore, it is more preferable that the roll forming member 10 shown in Fig. 5 (b) is applied to the connecting portion of the structural member 1 which requires sufficient load performance.

As shown in Fig. 4 (b), the roll forming member 10 can be overlapped welded at least at two or more of the overlapping portions of the main plate and the members forming the closed end face portion 110. [

A portion where the first body plate 130 overlaps with the member of the second closed end face portion 112 and a portion where the second body plate 150 and the member of the first closed end face portion 111 overlap, .

As shown in FIGS. 4 (a), 5 (a) and 5 (b), the connection joint portion 200 and the end surface portion 110 closest to the connection joint portion 200 The boundary can be welded. That is, the closed end face portion 110 disposed at the boundary forming portion can be welded at the boundary with the connecting joint portion 200.

The boundary between the first connection joint portion 210 and the first closed end face portion 111 closest to the first connection joint portion 210 is welded to the first connection joint portion 210 as shown in Figs. 4 (a) and 5 (a) And a boundary of the second connecting joint portion 230 and the closed end face portion 112 closest to the second connecting joint portion 230 can be welded.

It is possible to secure the structural rigidity of the roll forming member 10 even if the welding portion W is formed only at two places. As a result, the welding amount for forming the roll forming member 10 is reduced, and the manufacturing cost of the roll forming member 10 is reduced, and sufficient strength can be ensured.

The boundary between the first connection joint portion 210 and the first closed end face portion 111 closest to the first connection joint portion 210 can be welded together as shown in Figure 5 (b) The boundary between the joint part 230 and the fourth closed end face part 114 closest to the second connection joint part 230 can be welded.

At least the roll forming body 100 of the roll forming body 100 and the connecting joint 200 is formed of a material selected from the group consisting of martensitic steel, CP steel, DP steel, TRIP steel, and TWIP steel having a strength of 980 MPa or more Material.

As shown in FIG. 3, the connection joint 200 may be partially formed at a portion of both ends in the longitudinal direction of the roll forming body 100.

This is welded to the boundary between the closed end surface portion 110 and the connection joint portion 200 constituting the roll forming body 100. The entire connection joint portion 200 need not be coupled with the structural member 1, The connection joint 200 may be formed in a part of the longitudinal direction of the roll forming body 100, but not in the longitudinal direction.

Accordingly, the amount of steel used for forming the connection joint portion 200 is reduced, and the welding amount for joining the structural member 1 and the connection joint portion is minimized, thereby reducing the manufacturing cost of the roll forming member 10 .

As shown in FIG. 3, the roll forming body 100 and the connecting joint 200 may be formed in the lengthwise direction on the contact surface of the structural member 1. As shown in FIG.

The roll forming body 100 and the connecting joint 200 may be formed by a roll bending process so that curvature is formed in the longitudinal direction.

It is necessary to set the curvature in the longitudinal direction such as the roll forming member 10 to be joined to the structural member 1. The roll forming body 100 and the connecting joint 200 are formed by a single roll forming process After the roll forming member 10 is continuously formed, the formed roll forming member 10 can be formed to have a predetermined curvature in the longitudinal direction by a roll bending process.

Hereinafter, a conventional roll forming member 10 shown in FIG. 1 and a roll forming member 10 of the present invention shown in FIG. 4 will be described with reference to FIG.

First, FIG. 7A shows a cross section of a roll forming member 10 coupled with a conventional structural member 1 shown in FIG. 1 and a cross section of a roll forming member 10 joined with the inventive structural member 1 shown in FIG. 10).

7 is a cross-sectional view of the conventional roll forming member 10 shown in Fig. 1 and the cross section of the roll forming member 10 of the present invention shown in Fig.

7, the roll-forming member 10 of the present invention shown in Fig. 5 is significantly reduced in cross-sectional area as compared with the conventional roll-forming member 10 shown in Fig. 1, The effect of reducing the manufacturing cost of the roll forming member 10 by reducing the cross-sectional area occupied by the roll forming member 10 can be obtained even when the roll forming member 10 provided at the joining portion of the roll forming member 10 have.

Referring to Fig. 7, the first region S1, which is the installation area of the roll forming member 10 of the present invention shown in Fig. 4, and the second region S1, which is the installation region 2 of the conventional roll forming member 10 shown in Fig. It can be seen that the region S2 has a considerable difference in cross section.

8, the filler body 100 includes a first body plate 130, a second body plate 150, a first closed end face 111, and a second closed end face 112 .

The second body plate 150 is extended from the second connection joint portion 230 and the second body plate 150 is bent at the end of the second body plate 150 to form the second closed end face portion 112, And the first closed end face 111 are formed continuously and the first closed end face portion 112 and the second closed end face portion 112 are formed and then the second closed end face portion 112 The first connection joint part 210 may be formed while being bent in a direction of 90 degrees in a state extending along the side of the second body plate 130 in the direction of the second body plate 130. [

9 to 12 are views showing a roll forming member of the present invention having various embodiments.

9 and 10, the roll-forming body 100 may form a plurality of closed end face structures including a plurality of closed end face portions 110, at least a part of which is formed into an arc shape.

An even number of closed end portions 110 are continuously formed in the roll forming body 100, and at least a part of the corners of each of the closed end portions 110 may be formed in a curved shape.

At this time, three corners of four corners of each closed end face 110 are formed to be curved, and each curved corner can be roll-formed into an arc shape.

9, a closed end face portion 110 formed in the roll forming body 100 includes an eight-shaped end face portion 110 in which two closed end face portions 110 are continuously formed and each of the closed end face portions 100 has a curved shape Section.

As shown in Fig. 10 (a), an 8-shaped cross section composed of two closed end face portions 100 is continuously formed in the transverse direction, or as shown in Fig. 10 (b) The roll forming body 100 can be formed while being continuously formed.

As described above, there is an effect that the closed end face portion 110 is formed in an overlapping manner according to the magnitude and direction of the load applied to the roll forming member 10, thereby further improving the load performance.

Referring to FIGS. 11 and 12, the roll forming body 100 may form a plurality of closed end face structures including a plurality of closed end faces 110 formed in a rectangular cross section.

11 and 12, an even number of closed end face portions 110 are continuously formed in the roll forming body 100, and at least a part of the corners of each closed end face portion 110 may be formed in an angular shape .

At this time, each of the closed end face portions 110 can be roll-formed into a rectangular cross-section where four corners are angled.

As shown in Fig. 12 (a), an 8-shaped cross section composed of two closed end face portions 100 is continuously formed in the transverse direction, or as shown in Fig. 12 (b) The roll forming body 100 can be formed while being continuously formed.

However, it is needless to say that the shape of the closed end face 110 may have various shapes of polygonal cross-sectional shapes as long as it can improve the load performance of the roll forming member 10.

Such a roll forming member 10 can be configured to exhibit structural performance of supporting a load at a connecting portion of various structural members 1. [

Particularly, the present invention can be applied to various products that exhibit the structural performance of an automobile, and can be variously applied to an impact carrier, a bumper, a frame, a filler member, and the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And will be apparent to those skilled in the art.

1: structural member
10: roll forming member 100: roll forming body
110: closed end face portion 111: first closed end face portion
112: second closed end face portion 113: third closed end face portion
114: fourth closed end face portion 130: first main body plate
150: second body plate 200: connection joint
210: first connection joint 230: second connection joint
S1: first region S2: second region
P: press member W: welded portion

Claims

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A roll forming body forming at least one closed end face portion; And
And a connection joint provided at at least one end of the roll forming body and coupled with the structural member,
Wherein the roll forming body and the connecting joint are integrally formed by a roll forming method,
The connecting joint comprises:
A first connection joint portion provided at one side of the roll forming body and a second connection joint portion provided at the other side of the roll forming body so as to face the first connection joint portion,
The roll forming body includes:
Wherein the roll forming member is formed by continuously forming a plurality of closed end portions by a roll forming method in a section between the first connecting joint portion and the second connecting joint portion.

4. The roll forming apparatus according to claim 3,
A first closed end surface portion having an 8-shaped cross section and a second closed end surface portion formed continuously by a roll forming method in a section between the first connection joint portion and the second connection joint portion, absence.

A roll forming body forming at least one closed end face portion; And
And a connection joint provided at at least one end of the roll forming body and coupled with the structural member,
Wherein the roll forming body and the connecting joint are integrally formed by a roll forming method,
The connecting joint comprises:
A first connection joint portion provided at one side of the roll forming body and a second connection joint portion provided at the other side of the roll forming body so as to face the first connection joint portion,
The roll forming body includes:
A first body plate extending from the first connection joint;
A second body plate extending from the second connection joint;
A first closed end surface connected to the first body plate and continuously roll-formed; And
And a second closed end surface portion, one side of which is associated with the first closed end surface portion and the other side of which is continuously roll-formed in association with the second main plate.

6. The method of claim 5,
Wherein the body plate and the member forming the closed end face portion are overlap welded at least at two or more of the overlapping portions.

6. The method according to any one of claims 3 to 5,
And a boundary of the connection joint portion and the closed end face portion closest to the connection joint portion is welded.

6. The method according to any one of claims 3 to 5,
At least the roll forming body of the roll forming body and the connecting joint,
A material selected from the group consisting of martensitic steel, CP steel, DP steel, TRIP steel and TWIP steel having a strength of 980 MPa or more.

6. The roll forming apparatus according to any one of claims 3 to 5,
Wherein the roll forming member forms a plurality of closed end face structures including a plurality of closed end faces formed in a triangular or rectangular cross section.

6. The method according to any one of claims 3 to 5,
Wherein the connecting joint is partially formed at a portion of both longitudinal ends of the roll forming body.