KR101947943B1 - Method of manufacturing stretch-flanged component - Google Patents
Method of manufacturing stretch-flanged component Download PDFInfo
- Publication number
- KR101947943B1 KR101947943B1 KR1020177035156A KR20177035156A KR101947943B1 KR 101947943 B1 KR101947943 B1 KR 101947943B1 KR 1020177035156 A KR1020177035156 A KR 1020177035156A KR 20177035156 A KR20177035156 A KR 20177035156A KR 101947943 B1 KR101947943 B1 KR 101947943B1
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- KR
- South Korea
- Prior art keywords
- peripheral edge
- concave
- line
- outer peripheral
- edge portion
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Abstract
An extensible flange formed part produced by stretch flange forming is manufactured by suppressing stretch flange breakage. A top plate portion 3 having a first concave outer peripheral edge portion 3a and a flange portion 7 having a second concave outer peripheral edge portion 7a bent to the top plate portion 3 in succession to the vertical wall portion 5 ) Of the extruded flange formed part. A stepped shape in which the ridgeline 9 extends so as to surround the second concave outer peripheral edge portion 7a at the position corresponding to the flange portion 7 along the second concave outer peripheral edge portion 7a and which is bent in the plate thickness direction (8).
Description
The present invention relates to a technique for manufacturing a stretch flange-formed part in which a flange portion is produced by stretch flange forming by having a top plate portion with a concave outer peripheral edge curved such that a part of the peripheral edge is curved inwardly.
As such a stretch flange-forming part, for example, a press-molded part used as a vehicle body frame part of an automobile, an L-shaped part or a T-shaped part as viewed from a plane can be exemplified. The present invention is a preferable technique especially in the case of producing an ultra high strength material of 980 MPa or more by press molding.
(See Fig. 11) such as a front pillar reinforcing member and a center pillar reinforcing member which are vehicle body framework parts of an automobile (see Fig. 11) or parts having a T-shaped portion (see Fig. 12) are manufactured by press molding from a plate- , Drawing molding or bending molding is generally employed.
Drawing molding is usually carried out using a mold made of a punch, die and wrinkle suppression (blank holder), and the distance between the punch and the die is approached while pressing the periphery of the metal plate with a die and a blank holder. . The bending process is usually carried out using a die made of a punch, a pad, and a die, and bending is performed by relatively moving the die with the metal plate sandwiched between the punch and the pad.
If the L-shaped portion or the T-shaped portion having a shape that is rapidly bent is formed only by the drawing molding as described above, cracks and wrinkles are liable to occur. In particular, in recent years, the strength of a metal plate as a molding material has been gradually increasing to achieve safety improvement and weight reduction of an automobile body. Since such a high strength metal plate can not be expected to have ductility of a soft steel plate conventionally used, It is important to take measures against breakage and wrinkles.
The portion where breakage is particularly likely to occur by the above press forming is a stretch flange forming portion of the curved portion. In this portion, the end face of the material extends in the peripheral direction, and the material enters a deformed state in which the material flows.
On the other hand, there is a technique described in
In this
However, in
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a stretch flange-formed part which can be manufactured by suppressing elongation flange breakage.
In order to solve the problem, one aspect of the present invention is a method for manufacturing a top plate having a top plate portion having a concave outer circumferential edge portion curved such that a part of the outer circumferential edge is recessed inward, a longitudinal wall portion continuing to the concave outer circumferential edge portion of the top plate, And a flange portion having a concave outer peripheral edge portion bent to the top plate portion continuously to the top wall portion and having a portion of the outer peripheral edge curved so as to be recessed inwardly, the manufacturing method comprising the steps of: The outer peripheral edge portion is defined as the first concave outer peripheral edge portion and the concave outer peripheral edge portion of the flange portion is defined as the second concave peripheral edge portion, a ridge line is formed at the position of the flange portion so as to surround the second concave peripheral edge portion The step-shaped portion extending in the thickness direction and bent in the plate thickness direction is formed in a shape And the contour of the second concave outer peripheral edge portion is defined as a concave curved portion connecting between the two straight line portions and between the two straight line portions, Wherein each of the extension lines extending from the extension line of the second concave outer peripheral edge to the position where the extension line of the two extension lines cross each other is defined as a reference line, Wherein a center bisector of an angle bisecting line of an angle formed by two reference lines and a distance from an intersection between the center line and the second concave peripheral edge are 20 mm and 50 mm, And a ridge line of the step-shaped portion is formed in the first step-forming region AR1 as the first step- A first ridge line extending in a direction along the second outer peripheral edge portion of the concave shape and a second ridge line extending in the direction of the first ridge line along each of the reference lines successively, Lt; / RTI >
According to another aspect of the present invention, there is provided an air conditioner comprising a top plate portion having a concave outer circumferential edge portion curved such that a part of the outer circumferential edge is recessed inward, a vertical wall portion continuing to the concave outer circumferential edge portion of the top plate portion, And a flange portion bent toward the top plate portion and having a concave outer circumferential edge portion curved such that a part of the outer circumferential edge thereof is recessed inwardly, characterized in that the concave outer peripheral edge portion of the top plate portion Wherein the flange portion is defined as a first concave outer peripheral edge portion and the concave outer peripheral edge portion of the flange portion is defined as a second concave outer peripheral edge portion so that a ridge extends to surround the second concave peripheral edge portion at a position to become the flange portion, A step-shaped portion bent in the thickness direction is formed, (2) When the outline shape of the concave outer peripheral edge is defined by two straight line portions and a concave curved line connecting between the two straight line portions, the second concave outer periphery Wherein each of the vertical line portions of the vertical line intersecting with the two vertical lines among the vertical lines perpendicular to the straight line portion continuous from the both ends of the curved portion and extending from both ends of the curved portion to the both ends And a line drawn to a position to be a flange portion is set as a reference line, an angle bisecting line formed by the two reference lines is set as a center line, and the second concave outer periphery A region located between two orthogonal lines orthogonal to the center line at a distance of 20 mm and 50 mm from the intersection point with the edge portion is referred to as a first step type The ridgeline of the step-shaped portion is defined as an area AR1, a first ridge line extending in the first step-forming region in the direction along the second concave peripheral edge portion, and a second ridge line extending in the direction of the first ridge line, And a second ridge line extending left and right along the first flange portion.
According to the embodiment of the present invention, even if a super high tensile strength material having a strength level of 980 MPa or more is used, the stepped portion is previously provided so as to surround the second concave peripheral edge portion in which stretch flange breakage is likely to occur, Can be suppressed.
As described above, according to the present invention, even when an extensible flange-shaped molded part is produced from a super high tensile strength material having a strength level of 980 MPa or more, for example, by stretch flange forming, it is possible to manufacture by suppressing cracking of the extensible flange.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view for explaining an example of a stretch flange molded part according to an embodiment of the present invention. FIG.
Fig. 2 is a perspective view for explaining an intermediate part having steps according to the embodiment of the present invention. Fig.
3 is a schematic cross-sectional view illustrating a mold used in a first step according to an embodiment of the present invention.
4 is a schematic cross-sectional view for explaining an intermediate part having steps after the first step according to the embodiment of the present invention.
5 is a schematic diagram showing an example of a step shape according to an embodiment of the present invention.
6 is a view for explaining a method of determining a step-like portion.
7 is a diagram for explaining the first determination method.
8 is a diagram for explaining the second determination method.
Fig. 9 is a perspective view including a partial cross-section of a mold used in a second step according to the embodiment of the present invention. Fig.
10 is an explanatory diagram of a second step according to the embodiment of the present invention.
11 is a view showing an A pillar.
12 is a view showing a B pillar.
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case where an extensible flange-shaped molded part having a portion to be a stretch flange forming portion is manufactured by using an ultra high tensile strength material of 980 MPa or more as a base plate (blank material) before press forming will be described as an example. The manufacturing method of the present invention is also applicable to a material made of a metal plate having a strength of 980 MPa or less.
Further, for example, an A filler (see FIG. 11) and a B filler (see FIG. 12) can be cited as a portion to be a stretch flange forming portion.
In the following description, attention will be given to a portion including a portion to be a stretch flange forming portion of the stretch flange-formed part, and only the corresponding portion is shown in each drawing, and the portion is referred to as " stretch flange forming portion 1) ". Also, in the mold, only the portion to be molded is shown. It goes without saying that other parts may be formed at the same time.
It should be noted that a workpiece portion (a portion to be trimmed in the third step) at a position outside the flange portion forming position is omitted as appropriate.
As shown in Fig. 1, the stretch
Here, in the present specification, the concave outer
The method of manufacturing the extensible flange-formed part of the present embodiment includes, for example, a first step, a second step and a third step, and is executed in this order.
In the first step, a step of producing an intermediate part (see Fig. 2) having a step of providing a step-
In the second step, the first concave outer
In the third step, the second intermediate component is trimmed and the outer peripheral edge of the
In addition, the third step may be omitted, and the base material (also referred to as blank material) before molding may be trimmed before the first step.
Hereinafter, each step will be described in detail.
[First Step]
In the first step, as shown in Fig. 2, a step-formed portion composed of a step-shaped end portion is formed at the position of the
That is, in the first step, the
A second concave shape along the second concave
The height of the step of the step-shaped portion 8 (height in the thickness direction) is preferably 3 mm or more and 10 mm or less.
The stepped
≪ Regarding the step-shaped
The step-
An example of a preferable method of determining the
The
In this embodiment, first, the contour of the second concave outer
The first determining method in which the angle? Is in a range of 60 degrees or more and 90 degrees or less in accordance with an angle? Of a piercing angle on the side of the concave outer peripheral edge portion formed at each extension line of the two
(First Determination Method)
The first determination method will be described with reference to Fig.
In the first determination method, first of all the extension lines of the two
Subsequently, the
A region located between two orthogonal lines orthogonal to the
The
The end 9Aa of the
Next, the left and right
The
Here, the connection portion between the
By doing so, the step-
(Second determination method)
The second determination method will be described with reference to Fig.
From the opposite end portions of the
Next, each vertical line portion until the two
Since the
[Second Step]
The second step is a step of bending the intermediate part having the step provided with the stepped
In this second step, by moving the die relative to the punch in a state in which the portion of the intermediate part having the step formed in the first step, which is the
≪ Mold for Second Process >
The second process die used in the second process will be described with reference to Fig.
9, the
<Punch>
The
The upper surface of the rising
The
9 and 10, only a part thereof is shown.
<Pad>
The
<Die>
The side surface of the die 32 is a curved surface that cooperates with the side surface of the
A stepped
The height difference between the
By setting in this manner, the step-
When the step-
The second process using the second process metal mold constructed as described above will be described with reference to Fig. 10 together with the operation of the second process metal mold.
Fig. 10 is a view for explaining the steps until the intermediate part having the steps is press-molded. 10 (a) shows a state in which the
First, as shown in Fig. 10 (a), the
In this state, the
At this time, the portion where the step-shaped
Further, since the step-shaped
In the first step, the step-shaped
In addition, by forming the step-shaped
By thus equalizing the tensile stress acting on the portion as the second concave outer
In addition, during molding, the portion including the step-
As described above, the second intermediate component is molded without cracking.
In the above description, the case where the step-shaped portion adjusting portion is provided on the lower surface of the die is exemplified. However, the lower surface of the die may be formed to engage with the upper surface of the
Further, the step-
[Third Step]
In the third step, a portion outside the
As described above, since the step-shaped
[Effect of this embodiment]
(1) The
According to this configuration, even if a super high tensile strength material having a strength level of 980 MPa or more is used, the stepped
As described above, according to the present embodiment, even when an elongated flange-shaped molded part is produced from a super high tensile strength material having a strength level of 980 MPa or more, for example, by stretch flange forming, it is possible to manufacture the device by suppressing elongation flange fracture.
(2) After the second step, there is a third step of trimming the portion outside the
When the base plate (blank material) before the press forming is trimmed by punching or laser processing, burrs or minute damages are left on the end face of the material, and when the deformation is applied, local stress concentration is likely to occur . Therefore, in the case of a very high tensile strength material (high-strength steel sheet having a strength level of 980 MPa or more), cracks such as elongation flange breakage occur on the end face of the material at the end face of the material, the crack propagates rapidly and large cracks are likely to occur.
On the other hand, after the second step, the outer side portion of the
(3) The determination of the
According to this configuration, it is possible to determine an appropriate step-shaped
(4) The
According to this configuration, the
(5) The height of the step of the step-
By defining the height of the
[Example]
As an example of a component having an
The molding analysis of the B pillar shown in Fig. 12 was performed as an example of a component having an
The processing step is a case where the step-shaped
Here, 80 degrees is adopted as an acute angle and 110 degrees is used as an obtuse angle.
The height of the
The
The above-described analysis was carried out by using the general-purpose dynamic amendment software LS-DYNA and evaluating the moldability of the molded product after the molding analysis that cracking occurred when a reduction rate of 10% or more was recognized in the
≪ Example 1 >
As
In the first embodiment, the stepped
The method of determining the
The stepped
The evaluation results are shown in Table 1.
[Table 1]
As can be seen from Table 1, in the case of not having the step-shaped
That is, in the case where the step-shaped
≪ Example 2 >
As the second embodiment, evaluation was performed on the position of the
In the second embodiment, in the case where the stepped
At this time, the
The evaluation results are shown in Table 2.
[Table 2]
As can be seen from Table 2, when the setting position of the
This is because when the
≪ Example 3 >
The effect of the position of the
At this time, the position of the
The evaluation results are shown in Table 3.
[Table 3]
As can be seen from Table 3, it was evaluated that when the offset of the
This is because, when the offset amount from the
<Example 4>
As Embodiment 4, the step height of the step shape is evaluated.
In the fourth embodiment, it is evaluated whether or not the extension flange breakage occurs according to the height of the step-
The
The evaluation results are shown in Table 4.
[Table 4]
As can be seen from Table 4, in the case where the height of the step was set outside the range of 3 mm or more and 10 mm or less by the molding of the first step, it was evaluated that elongation flange breakage occurred in the bending molding in the second step.
This is because if the height of the step is less than 3 mm, an increase in the line length difference, which is one of the factors for suppressing the elongation flange breakage, can not be measured. Therefore, cracking tends to occur. When the step height exceeds 10 mm, It is presumed that cracking occurs at the step of molding the step-shaped
The entire contents of Japanese Patent Application 2015-121390 (filed on June 16, 2015), the contents of which are hereby incorporated by reference, are incorporated herein by reference.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be apparent to those skilled in the art.
One;
3a; A first concave outer
7; Flange portion
7a; A second concave outer
9;
9B;
12a;
20; A
22; A
25;
30a;
32;
32b;
AR1; A first step forming region AR2; domain
θ; Angle
Claims (5)
A stepped portion extending in a ridge line to surround the second concave peripheral edge portion and bent in a plate thickness direction is formed at a position corresponding to the flange portion and then the vertical wall portion is formed,
When the contour of the second concave outer peripheral edge portion is defined by two straight line portions and a concave curve portion connecting between the two straight line portions, the second concave portion formed by the extension line of the two straight line portions The piercing angle at the side of the outer peripheral edge of the shape is 60 degrees or more and 90 degrees or less,
Wherein each of the extension lines of the two straight line portions extends to a position where both extension lines cross each other as a reference line,
The center line of each perpendicular bisector formed by the two reference lines,
An area located between two orthogonal lines orthogonal to the center line at a distance of 20 mm and 50 mm from the intersection point with the second concave outer peripheral edge portion in the center line is defined as a first step forming region,
The ridgeline of the step-shaped portion includes a first ridge extending in the first step-forming region in the direction along the second concave peripheral edge portion, and a second ridge extending in the direction of the first ridge, And a second ridge line on the left and right sides.
A stepped portion extending in a ridge line to surround the second concave peripheral edge portion and bent in a plate thickness direction is formed at a position corresponding to the flange portion and then the vertical wall portion is formed,
When the contour of the second concave outer peripheral edge portion is defined by two straight line portions and a concave curve portion connecting between the two straight line portions, the second concave portion formed by the extension line of the two straight line portions The piercing angle at the side of the outer periphery of the shape is 90 degrees or more and 120 degrees or less,
Wherein each of the vertical lines extending from the opposite ends of the curved portion perpendicular to the straight line portion to the intersection of the two vertical lines is a line connecting both ends of the curved portion to a position as a flange portion With the broken line as the reference line,
The center line of each perpendicular bisector formed by the two reference lines,
An area located between two orthogonal lines orthogonal to the center line at a distance of 20 mm and 50 mm from the intersection point with the second concave outer peripheral edge portion in the center line is defined as a first step forming region,
Wherein the ridge line of the step-shaped portion includes a first ridge line extending in the first step-forming region in the direction along the second concave peripheral edge portion, and a second ridge line extending in the left and right direction And a second ridge line of the second flange portion.
Wherein the second ridge extending along the reference line extends in an area within two lines parallel to the reference line of interest and offset by 5 mm in both left and right directions from the reference line. Way.
Wherein a height of the step of the step-shaped portion is 3 mm or more and 10 mm or less.
Wherein a height of the step of the step-shaped portion is 3 mm or more and 10 mm or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP-P-2015-121390 | 2015-06-16 | ||
| JP2015121390 | 2015-06-16 | ||
| PCT/JP2016/065154 WO2016203904A1 (en) | 2015-06-16 | 2016-05-23 | Method for manufacturing stretch flange molded component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20180004771A KR20180004771A (en) | 2018-01-12 |
| KR101947943B1 true KR101947943B1 (en) | 2019-02-13 |
Family
ID=57545253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020177035156A KR101947943B1 (en) | 2015-06-16 | 2016-05-23 | Method of manufacturing stretch-flanged component |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6052478B1 (en) |
| KR (1) | KR101947943B1 (en) |
| CN (1) | CN107708884B (en) |
| MX (1) | MX2017016135A (en) |
| WO (1) | WO2016203904A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6156608B1 (en) * | 2015-08-28 | 2017-07-05 | Ｊｆｅスチール株式会社 | Manufacturing method of stretch flange molded parts |
| WO2020026356A1 (en) * | 2018-07-31 | 2020-02-06 | 日本製鉄株式会社 | Stretch flange forming tool and stretch flange forming method employing same, and member with stretch flange |
| MX2021008365A (en) * | 2019-01-11 | 2021-08-05 | Jfe Steel Corp | Press-molding method, blank member of plate-shaped material, intermediate molded article, method for manufacturing press-molded article, and press-molded article. |
| WO2020144995A1 (en) * | 2019-01-11 | 2020-07-16 | Ｊｆｅスチール株式会社 | Press-molding method, blank member of plate-shaped material, intermediate molded article, method for manufacturing press-molded article, and press-molded article |
| CN113631292B (en) * | 2019-03-28 | 2023-08-11 | 本田技研工业株式会社 | Press forming method |
| CN113231511B (en) * | 2021-06-03 | 2023-03-28 | 四川航天长征装备制造有限公司 | Rapid forming method for manual outer pulling edges at four corners of box-shaped sheet metal part |
| CN113458275A (en) * | 2021-07-08 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Vehicle body outer covering piece flanging unfolding process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007118014A (en) | 2005-10-26 | 2007-05-17 | Nissan Motor Co Ltd | Press-forming method and press-forming apparatus |
| JP2008264857A (en) | 2007-04-24 | 2008-11-06 | Nippon Steel Corp | Press forming method having excellent shape fixability |
| JP2009233710A (en) | 2008-03-27 | 2009-10-15 | Mazda Motor Corp | Press forming method and press forming die device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0576951A (en) * | 1991-09-18 | 1993-03-30 | Toyota Motor Corp | Press forming method |
| JPH08103828A (en) * | 1994-10-04 | 1996-04-23 | Nissan Motor Co Ltd | Low temperature drawing method, drawing die unit and press |
| ES2965617T3 (en) * | 2010-05-19 | 2024-04-16 | Nippon Steel Corp | L-shaped components pressing forming method |
| RU2636426C2 (en) * | 2013-01-07 | 2017-11-23 | Ниппон Стил Энд Сумитомо Метал Корпорейшн | Compacted component and method and device for its manufacture |
| JP6015784B2 (en) * | 2014-02-25 | 2016-10-26 | Ｊｆｅスチール株式会社 | Manufacturing method of stretch flange molded parts |
-
2016
- 2016-05-23 JP JP2016555802A patent/JP6052478B1/en not_active Expired - Fee Related
- 2016-05-23 MX MX2017016135A patent/MX2017016135A/en active IP Right Grant
- 2016-05-23 CN CN201680034914.7A patent/CN107708884B/en active Active
- 2016-05-23 WO PCT/JP2016/065154 patent/WO2016203904A1/en active Application Filing
- 2016-05-23 KR KR1020177035156A patent/KR101947943B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007118014A (en) | 2005-10-26 | 2007-05-17 | Nissan Motor Co Ltd | Press-forming method and press-forming apparatus |
| JP2008264857A (en) | 2007-04-24 | 2008-11-06 | Nippon Steel Corp | Press forming method having excellent shape fixability |
| JP2009233710A (en) | 2008-03-27 | 2009-10-15 | Mazda Motor Corp | Press forming method and press forming die device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107708884B (en) | 2019-06-25 |
| CN107708884A (en) | 2018-02-16 |
| JP6052478B1 (en) | 2016-12-27 |
| JPWO2016203904A1 (en) | 2017-06-29 |
| WO2016203904A1 (en) | 2016-12-22 |
| MX2017016135A (en) | 2018-04-18 |
| KR20180004771A (en) | 2018-01-12 |
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