Collision reinforcement part and manufacturing method thereof

Abstract

The impact reinforcement component according to the present invention includes a component body having side walls formed on both sides in the longitudinal direction, and an upper plate connecting upper ends of the side walls on both sides, and end flanges bent and formed on both ends in the longitudinal direction of the component body, the component body being formed by continuously repeating roll stamping in which a stamping roll rotates and presses a material multiple times, and the component body includes a body portion having a bead formed on the upper plate along the longitudinal direction, and a boundary portion which is integral with the body portion and the end flange and where the upper plate is flat as a joint portion between the body portion and the end flange.

Description

[Technical field]

[0001] The present invention relates to a crashworthiness component and a manufacturing method thereof, and more particularly to a crashworthiness component, such as a seat cross member, whose rigidity is reinforced for crashworthiness, and a manufacturing method thereof. [Background technology]

[0002] The roll stamping technology is a technology described in the following registered patents: Roll Stamping Apparatus (Registration No. 10-1417278), Roll Stamping Apparatus (Registration No. 10-1786260), and Roll Stamping Apparatus and Method (Registration No. 10-1917450).

[0003] The essence of roll stamping technology is the production of parts with a cross-sectional shape that changes along their length using a roll forming device.

[0004] However, parts that change shape in the length direction cannot be manufactured using the usual roll forming method. Therefore, they are generally manufactured using press molding that uses a mold. However, if the material is strong, it is not easy to manufacture large parts because a very high press capacity is required to mold them.

[0005] Therefore, roll stamping is a useful technology that can solve such limitations. However, since roll stamping is basically a technology that uses a roll forming device, it is not easy to practically apply it to a very long part that has a change in shape in the length direction. That is, since it is necessary to carve the shape of the part in the length direction around the stamping roll, it is necessary to increase the diameter of the stamping roll when the part is long. However, such an increase in the diameter of the stamping roll directly leads to a problem that the roll forming device must be made considerably larger overall, and therefore, it is difficult to practically apply it in terms of installation space. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent No. 10-1417278 [Patent Document 2] Korean Patent No. 10-1786260 [Patent Document 3] Korean Patent No. 10-1917450 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been invented to solve the above problems, and an object of the present invention is to provide a crashworthiness part that can be manufactured by a roll stamping method without increasing the diameter of the stamping roll when manufacturing a part from a long material, and a manufacturing method thereof. [Means for solving the problem]

[0008] In order to achieve the above object, the impact reinforcement part according to the present invention includes a part body having side walls formed on both sides in the longitudinal direction, and a top plate connecting upper ends of the side walls on both sides, and end flanges bent and formed on both ends in the longitudinal direction of the part body, the part body being formed by continuously repeating roll stamping in which a stamping roll rotates and presses a material multiple times, and the part body includes a body portion having a bead formed on the top plate along the longitudinal direction, and a boundary portion which is integral with the body portion and the end flanges and where the top plate is flat as a joint portion between the body portion and the end flanges.

[0009] Here, the body portion may include a bead region in which the beads are formed on an upper plate, the bead regions being spaced apart from each other in a longitudinal direction, and a middle no-bead region in which the upper plate is flat and is located between the plurality of bead regions.

[0010] At this time, the bead region may include a plurality of beads arranged on the upper plate at intervals in a width direction.

[0011] Additionally, the length of the intermediate no-bead region in the longitudinal direction may be equal to or greater than twice the combined length of the boundary portion and the end flanges.

[0012] Meanwhile, according to another aspect of the present invention, there is provided a method for manufacturing a collision reinforcement part, comprising: a roll stamping step of continuously repeating roll stamping by rotating and pressing a stamping roll multiple times along a length direction of a 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 and a middle no-bead region between the plurality of bead regions are formed in the material, and an end no-bead region is formed at each of the both ends.

[0013] Specifically, the roll stamping step includes an entire bending process in which the material is bent while pressing and rotating the stamping roll a plurality of times to form side walls and an upper plate on both sides; a first end no-bead process in which a flat upper plate is formed at one end in a longitudinal direction of the material to form the end no-bead region; a bead process in which a plurality of beads are formed on the upper plate of the material at intervals in a longitudinal direction to form the plurality of bead regions; a middle no-bead process in which a flat upper plate is formed between the plurality of beads to form the middle no-bead region; and a second end no-bead process in which a flat upper plate is formed at the other end in a longitudinal direction of the material to form the end no-bead region. The first end no-bead process, bead process, middle no-bead process, and second end no-bead process may be performed in the entire bending process, and the middle no-bead process may be performed in the bead process.

[0014] In this case, the longitudinal length of the intermediate no-bead region formed by the intermediate no-bead process can be equal to or greater than twice the longitudinal length of the end no-bead region formed by the first end no-bead process or the second end no-bead process. Effect of the Invention

[0015] In the collision reinforcement part according to the present invention, a part body is formed by continuously repeating roll stamping, in which a stamping roll rotates and presses a material multiple times, so that a bead region is formed in the body part of the part body, and a boundary part having a no-bead region extends from the body part and is configured as an integrated structure connecting to the end flange, so that the bead region of the body part can reinforce rigidity, and at the same time, the no-bead region of the boundary part has the effect of making it smooth and easy to form bending deformation of the end flange.

[0016] In addition, the method for manufacturing a crashworthiness component according to the present invention includes a roll stamping step in which the stamping roll is rotated and pressed multiple times along the length direction of the material to continuously repeat roll stamping. This has the advantage that a very long component can be manufactured without increasing the diameter of the stamping roll while configuring the component so that the shape change in the length direction is periodically repeated, and the above-mentioned boundary portion can also be easily formed. [Brief description of the drawings]

[0017] [Figure 1] 1 is a diagram showing a seat cross member according to the prior art. [Diagram 2] 1 is a view showing a collision reinforcement part according to the present invention; [Diagram 3] FIG. 3 is an enlarged view of A in FIG. [Figure 4] FIG. 3 is an enlarged view of B in FIG. [Diagram 5] 4 is a flowchart showing a method for manufacturing a crashworthiness component according to the present invention. [Figure 6]6 is a flow chart showing a roll stamping step in the method for manufacturing the impact reinforcement part of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that a person having ordinary skill in the art to which the present invention pertains can easily carry out the present invention. However, in describing preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may obscure the gist of the present invention, the detailed description will be omitted. In addition, parts having similar functions and operations are given the same reference numerals throughout the drawings. In addition, in this specification, terms such as "top", "upper part", "upper surface", "lower", "lower surface", "side", etc. are based on the drawings and may actually change depending on the direction in which components are arranged.

[0019] In addition, throughout the specification, when a certain part is said to be "connected" to another part, this includes not only the case where the part is "directly connected" to another part, but also the case where the part is "indirectly connected" through another component therebetween. Furthermore, "comprising" a certain component does not mean that the other component is excluded, but that the other component can be further included, unless otherwise specified to the contrary.

[0020] FIG. 1 is a diagram showing a seat cross member according to the prior art.

[0021] Referring to the drawings, a seat cross member 10 is configured in the lower part of a vehicle as a reinforcing part prepared for a collision from the vehicle, that is, as a collision reinforcing part.

[0022] Such a seat cross member 10 is configured as a single unit part having a hat-shaped cross section.

[0023] Such a sheet cross member 10 can be manufactured by roll forming since there is no change in the cross-sectional shape along the length direction. That is, flanges 11 can be generated by post-processing on both ends of the roll-formed part, and then welded to the sealing side 20.

[0024] However, a structure formed simply of both side walls 10a and a flat top plate 10b reaches a limit where the reinforcement against a collision is insufficient.

[0025] To overcome such limitations, a sheet cross member can be manufactured that includes a bead (a portion that protrudes relatively upward compared to other portions) in the upper plate, although this is not shown in the drawings.

[0026] However, if a bead is formed along the entire length of the upper plate, i.e., if the bead is formed to the ends in the length direction, it becomes very difficult to create a flange that can be bent and deformed during the manufacturing process.

[0027] In other words, since the end of the sheet cross member is not simply hat-shaped, but has a complex cross-sectional shape with a cross-sectional periphery that is bent (folded) multiple times by beads, it becomes very difficult to bend and deform the end to create a flange.

[0028] Therefore, in order to form a simple hat-shaped cross-sectional structure without a bead only at the end of the seat cross-member, the seat cross-member is composed of multiple unit parts rather than one unit part. In other words, the seat cross-member can be made by connecting (joining by welding, etc.) a unit part having a structure with a bead and another unit part having a simple hat-shaped cross-sectional structure without a bead.

[0029] However, in the case of a simple hat-shaped cross-sectional structure like this, with no beads at the ends, it is easy to bend the ends to create a flange. However, when a sheet cross-member is made by joining multiple unit parts rather than as a single unit, the rigidity of the area where the unit parts are connected (for example, the welded area) is relatively inferior to other areas, making it difficult to use it as a collision reinforcement part.

[0030] FIG. 2 is a view showing a crashworthiness component 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.

[0031] Referring to the drawings, in order to solve the above-mentioned problems, the collision reinforcement part 1000 according to the present invention is configured with a boundary portion 120 having a simple cross-sectional structure without a bead (a portion that protrudes relatively upward compared to other parts) at the end, and such boundary portion 120 is configured as an integrated structure rather than a separate member from other parts.

[0032] Specifically, the present invention includes a component body 100 and an end flange 200 .

[0033] The component body 100 is formed by continuously repeating roll stamping, in which a stamping roll rotates and presses against a material multiple times.

[0034] The component body 100 manufactured by such a method structurally has side walls S formed on both sides in the length direction, and an upper plate U connecting the upper ends of the side walls S on both sides.

[0035] The end flanges 200 are formed by bending both ends in the length direction of the component body 100. As an example, such end flanges 200 are portions that are welded to other components, such as a seal side.

[0036] Here, the component body 100 includes a body portion 110 and a boundary portion 120 .

[0037] The body portion 110 has a bead 111a formed on the upper plate U along the length direction.

[0038] Moreover, the boundary portion 120 is a joint portion between the body portion 110 and the end flange 200 and is integral with the body portion 110 and the end flange 200 .

[0039] At this time, the upper plate U of the boundary portion 120 has a flat structure with no bead formed. Such a boundary portion 120 is a portion having a substantially short length, such as a boundary line between the body portion 110 and the end flange 200.

[0040] More specifically, the body portion 110 includes a bead region 111 and a middle no-bead region 112 .

[0041] The bead regions 111 are spaced apart from one another in the lengthwise direction, and a bead 111a is formed on the upper plate U. That is, the bead regions 111 are formed long in the lengthwise direction, but since there is a middle no-bead region 112 in the middle, the bead regions 111 are spaced apart from one another. For example, as shown in the drawing, two bead regions 111 may be spaced apart from one another.

[0042] The bead regions 111, each of which is spaced apart in the length direction, are formed by roll stamping, as described in the part manufacturing method below. That is, a stamping roll rotates and compresses the material multiple times, forming multiple beads 111a spaced apart in the length direction.

[0043] Furthermore, the bead region 111 may have a plurality of beads 111a spaced apart from one another in the width direction of the upper plate U. When the bead region 111 is spaced apart from one another in the width direction in this manner, the rigidity of the collision reinforcement component 1000 is increased.

[0044] Moreover, the intermediate no-bead region 112 is located between the plurality of bead regions 111, and the upper plate U has a flat structure.

[0045] As described above, the bead regions 111 are arranged in the longitudinal direction of the body portion 110 at intervals, and the upper plate U has a flat intermediate no-bead region 112 between the multiple bead regions 111, which are the intervals.

[0046] The stamping roll has an uneven structure for forming the bead 111a, and also has a flat portion for forming the boundary portion 120. When the size (diameter) of the stamping roll is an appropriate size (diameter) taking into consideration various factors such as the side surface of the installation space, in order to manufacture a long collision reinforcement part 1000, a middle no-bead region 112 where the upper plate U is flat like the boundary portion 120 is formed by rotating and pressing multiple times.

[0047] That is, by using a structure such as the middle no-bead region 112, the impact reinforcement part 1000 of the present invention can be realized by a manufacturing method using multiple rotation compression of a stamping roll.

[0048] The boundary portion 120 is located at each of both ends of the component body 100 in the longitudinal direction, and is the same portion as the boundary line between the body portion 110 and the end flange 200 as the flat portion of the upper plate U, so that the end flange 200 can be formed smoothly and easily during bending.

[0049] The end flange 200 has a structure in which it extends integrally from the boundary portion 120 before being bent. However, since the boundary portion 120 has a simple hat-shaped cross-sectional structure without a bead, the bending deformation of the end flange 200 can be performed smoothly and easily.

[0050] In this way, by adopting a manufacturing method using a stamping roll that rotates multiple times, the present invention forms a structure in which the longitudinal length of the middle no-bead region 112 is equal to or greater than twice the combined longitudinal length of the boundary portion 120 and the end flange 200.

[0051] When manufacturing a plurality of collision reinforcement parts 1000 having a set length using a long material, the material is roll stamped to form a plurality of collision reinforcement parts 1000, and then cut and separated. Therefore, the length of the middle no-bead region 112 must be twice the combined length of the boundary portion 120, which is the flat end no-bead region 121 of the upper plate U, and the end flange 200. Since some of the length may be lost during cutting, a condition of more than twice the length may be adopted in consideration of forming a sufficient end flange 200.

[0052] FIG. 5 is a flow chart showing a method for manufacturing an impact reinforcement part according to the present invention, and FIG. 6 is a flow chart showing a roll stamping step in the method for manufacturing an impact reinforcement part of FIG.

[0053] 2 to 4 and with reference to FIGS. 5 and 6, the method for manufacturing an impact reinforcement part according to the present invention includes a roll stamping step S100 and a flange forming step S200.

[0054] The roll stamping step S100 is a step of continuously repeating roll stamping by rotating and pressing the stamping roll multiple times along the length direction of the material.

[0055] The flange forming step S200 is a step carried out after the roll stamping step S100, and is a step of forming end flanges 200 by bending both ends of the material.

[0056] When manufacturing a collision reinforcement part such as a sheet cross member using a material having a long shape in the length direction, a product is completed through the roll stamping step S100 and the flange forming step S200.

[0057] Here, in the roll stamping step S100, a plurality of bead regions 111 and a middle no-bead region 112 between the plurality of bead regions 111 are formed in the material, and end no-bead regions 121 are formed at both ends.

[0058] Specifically, the roll stamping step S100 includes a full bending step S110, a first end no-bead step S120, a bead step S130, a middle portion no-bead step S130, and a second end no-bead step S150.

[0059] In the overall bending process S110, the material is bent while pressing and rotating a stamping roll multiple times to form both side walls S and an upper plate U.

[0060] In the first end no-bead process S120, a flat upper plate U is formed on one end of the material in the longitudinal direction to form an end no-bead region 121.

[0061] In the beading process S130, a plurality of beads 111a are formed on the upper plate U of the material at intervals in the length direction to form a plurality of bead regions 111.

[0062] In the no-bead intermediate portion process S130, a flat upper plate U is formed between the plurality of beads 111a to form the no-bead intermediate portion region 112.

[0063] In the second end no-bead process S150, a flat upper plate U is formed on the other end of the material in the length direction to form an end no-bead region 121.

[0064] At this time, the first end no-bead step S120, the bead step S130, the middle portion no-bead step S130, and the second end no-bead step S150 are performed during the entire bending step S110, and the middle portion no-bead step S130 is performed during the bead step S130.

[0065] That is, in the process in which the stamping roll rotates and presses the material multiple times to form both side walls S and the upper plate U on the material, the first end no-bead process S120, the bead process S130, and the second end no-bead process S150 are performed in sequence, and at this time, the middle portion no-bead process S130 is performed during the bead process S130. That is, in the process in which the stamping roll rotates and presses the material multiple times, the first end no-bead process S120, the bead process S130, the middle portion no-bead process S130, and the second end no-bead process S150 are performed.

[0066] In the flange forming step S200, the end no-bead region 121 having a flat upper surface is bent after the roll stamping step S100 to form an end flange 200.

[0067] Meanwhile, the length of the intermediate no-bead region 112 in the longitudinal direction may be equal to or greater than twice the length of the end no-bead region 121 in the longitudinal direction.

[0068] When manufacturing a plurality of collision reinforcement parts 1000 having a set length using a long material, the material is roll stamped in the roll stamping step S100 to form a plurality of collision reinforcement parts 1000, and then cut and separated. Therefore, the length of the middle no-bead region 112 must be twice the length of the end no-bead region 121 where the upper plate U is flat. However, since some of the length may be lost during cutting, a condition of more than twice the length may be adopted in consideration of forming a sufficient end flange 200.

[0069] As a result, the impact reinforcement part 1000 according to the present invention is formed by continuously repeating roll stamping, in which a stamping roll rotates and presses a material multiple times, to form the part body 100. As a result, a bead region 111 is formed in the body part 110 of the part body 100, and a boundary part 120 having a no-bead region extends from the body part 110 and is configured as an integrated structure connecting to the end flange 200, so that the rigidity can be reinforced by the bead region 111 of the body part 110, and at the same time, the no-bead region of the boundary part 120 makes it smooth and easy to form bending deformation of the end flange 200.

[0070] In addition, the method for manufacturing an impact reinforcement part according to the present invention includes a roll stamping step S100 in which the stamping roll is rotated and compressed multiple times along the length direction of the material, and roll stamping is continuously repeated. This allows the part to be constructed so that shape changes in the length direction are periodically repeated, making it possible to manufacture a very long part without increasing the diameter of the stamping roll, and also makes it easy to form the above-mentioned boundary portion 120.

[0071] Although the embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical concept or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting. [Explanation of symbols]

[0072] 100 part body 110 body part 111 bead area 111a bead 112 Middle no-bead area 120 Boundary 121 End no bead area 200 End flange 1000 Collision reinforcement parts S side wall U Upper plate S100 Roll stamping stage S110 Overall bending process S120 First end no-bead process S130 Bead process S140 Middle bead process S150 2nd end no-bead process S200 Flange forming stage

Claims

1. a component body having side walls formed on both sides in a length direction and a top plate connecting the top ends of the side walls on both sides; end flanges formed by bending at both ends of the component body in the longitudinal direction; Including, The part body is formed by continuously repeating roll stamping in which a stamping roll rotates and presses against a blank multiple times; The component body is a body portion having a plurality of beads formed on an upper plate along a length direction; The joint between the body and the end flange is integral with the body and the end flange, and the upper plate is a flat boundary portion. Including crash reinforcement parts.

2. The body portion is a bead region in which a plurality of beads are formed on the upper plate, the bead region being spaced apart from one another in the length direction; a middle no-bead region located between the plurality of bead regions and having a flat upper plate; The crash brace component of claim 1 , comprising:

3. The collision reinforcement component according to claim 2 , wherein the bead region includes a plurality of beads arranged on the upper plate at intervals in the width direction.

4. 3. The crash reinforcement component of claim 2, wherein the longitudinal length of the intermediate no-bead region is equal to or greater than twice the combined longitudinal length of the boundary portion and end flanges.

5. A roll stamping step of continuously repeating roll stamping by rotating and pressing the stamping roll multiple times along the length direction of the material; a flange forming step of bending both ends of the blank to form end flanges; Including, In the roll stamping step, The method for manufacturing a collision reinforcement component includes forming a plurality of bead regions in the material, a middle no-bead region between the plurality of bead regions, and forming end no-bead regions at each of both ends.

6. The roll stamping step includes: a total bending process in which the stamping roll is pressed and rotated multiple times on the material to bend the material to form both side walls and a top plate; a first end no-bead process for forming a flat upper plate on one end of the material in the longitudinal direction to form the end no-bead region; a beading process for forming a plurality of beads on the upper plate of the material at intervals in a longitudinal direction to form a plurality of the bead regions; a middle no-bead process for forming a flat upper plate between a plurality of the beads to form the middle no-bead region; a second end no-bead process for forming a flat upper plate on the other end of the material in the longitudinal direction to form the end no-bead region; Including, 6. The method for manufacturing a collision reinforcement component according to claim 5, wherein the first end no-bead process, the bead process, the middle portion no-bead process, and the second end no-bead process are performed during the entire bending process, and the middle portion no-bead process is performed during the bead process.

7. 7. The method for manufacturing an impact reinforcement component according to claim 6, wherein a length in a longitudinal direction of the intermediate no-bead region formed by the intermediate no-bead process is equal to or greater than twice a length in a longitudinal direction of the end no-bead region formed by the first end no-bead process or the second end no-bead process.

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