JPWO2002064284A1 - Bumper line hose having a substantially B-shaped closed cross section formed by press molding having a deep drawing process and a method of manufacturing the same - Google Patents

Bumper line hose having a substantially B-shaped closed cross section formed by press molding having a deep drawing process and a method of manufacturing the same Download PDF

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Publication number
JPWO2002064284A1
JPWO2002064284A1 JP2002564066A JP2002564066A JPWO2002064284A1 JP WO2002064284 A1 JPWO2002064284 A1 JP WO2002064284A1 JP 2002564066 A JP2002564066 A JP 2002564066A JP 2002564066 A JP2002564066 A JP 2002564066A JP WO2002064284 A1 JPWO2002064284 A1 JP WO2002064284A1
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Japan
Prior art keywords
pressing
shaped
bumper
sides
line hose
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Granted
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JP2002564066A
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Japanese (ja)
Inventor
将司 安藤
将司 安藤
陽一 久間
陽一 久間
秀夫 岡田
秀夫 岡田
浩太 小林
浩太 小林
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フタバ産業株式会社
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Priority to PCT/JP2001/001052 priority Critical patent/WO2002064284A1/en
Publication of JPWO2002064284A1 publication Critical patent/JPWO2002064284A1/en
Granted legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15Making tubes of special shape; Making tube fittings
    • B21C37/151Making tubes with multiple passages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/88Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806Structural beams therefor, e.g. shock-absorbing
    • B60R2019/1813Structural beams therefor, e.g. shock-absorbing made of metal

Abstract

The present invention relates to a bumper line hose used to enhance the safety of an automobile by improving the rigidity of the body of the automobile or absorbing energy at the time of a collision. It was intended to provide a bumper line hose having a cross section. The present invention includes a step of deep drawing a high-tensile steel sheet to form a hat shape at the center of the cross section, a step of trimming an outer shape to remove unnecessary portions, a step of pressing a rise at both ends of the cross section, and an L-shape on both sides of the cross section It is characterized in that it is manufactured by a step of press working on the inclined stand, a step of pressing from both sides of the cross section, and a step of pressing from above, a step of welding a joint portion, and the like. Further, a bumper-line hose having a maximum width in the central portion in the longitudinal direction and a gradually decreasing overall size toward both end portions, and a bumper-line hose having a smooth curved surface in the longitudinal direction in plan view.

Description

TECHNICAL FIELD The present invention relates to a bumper line hose used to enhance the safety of an automobile by improving the rigidity of an automobile body or absorbing energy at the time of a collision, and is roughly formed by press forming having a deep drawing process. The present invention relates to providing a lightweight and highly safe bumper line hose by forming a bumper line hose having a B-shaped closed cross section.
2. Description of the Related Art In many cases, a conventional bumper line hose has a thick C-shaped cross section. Japanese Patent No. 2846983 is known as an invention in which a high-strength steel sheet is used to form a closed cross section.
Thick, generally C-shaped cross sections must be made heavier in weight to ensure cross-sectional strength, and using them not only reduces the acceleration performance and fuel economy required for automobiles, but also reduces fuel consumption. It consumes a lot of energy and emits a lot of air pollutants, which is against modern social demands to protect the global environment.
In addition, a thick C-shaped cross section breaks sharply when the horizontal flange buckles, so a high degree of consideration is required to operate the air bag normally, and if it is not configured properly, When a car collided, its performance could not be fully demonstrated.
On the other hand, Japanese Patent No. 2846983 provides a bumper line hose having a substantially D-shaped closed cross-section by roll forming, but with a substantially D-shaped closed cross-section, there are only two members connecting the front surface and the rear surface, and the cross-sectional strength is low. Lower. Therefore, in order to obtain a bumper line hose having the same cross-sectional strength, it is necessary to use a material having a large plate thickness, and the material must be heavy.
In addition, the bumper line hose has a function of absorbing the energy at the time of collision while having the necessary strength, for example, a cross section having a large second moment of area at a central portion where a large bending moment is applied in a frontal collision, and having a relatively small section. At both ends where the bending moment is applied, a section with a small moment of inertia is formed as a section with a small moment of inertia. There was a request for conversion, but this was not easily achieved.
In addition, the present inventors have conceived of an invention in which a camber bending process in the longitudinal direction is performed after press-forming a B-shaped closed cross section. Need to be inserted. With the method of inserting the core metal from both ends, there is a problem that a bumper line hose having a reduced total width at both ends cannot be manufactured.
In addition, it is difficult to perform gentle bending by the camber bending method in the longitudinal direction, and only a bumper-line hose having a plurality of bends can be manufactured. With such a bumper line hose, there is a gap between the bumper cover and the bumper cover, so that even if the bumper cover of the car collides and deforms, there is a problem that the energy of the collision is not absorbed until the bumper line hose starts to deform. .
Further, the camber bending method in the longitudinal direction has a problem that wrinkle-like deformation occurs on the surface inside the bend.
The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and has as its object to manufacture a lightweight and highly safe roughly B-shaped product manufactured by a predetermined process using a high-tensile steel plate. To provide a bumper line hose having a closed cross section.
Further, for example, a bumper line hose having a cross section having a large second moment of area at a central portion where a large bending moment is applied in a head-on collision and a cross section having a small second moment of area at both ends where a relatively small bending moment is applied. Is to provide.
Further, the present invention provides a bumper line hose that has a smooth curved shape in the longitudinal direction in plan view and has no wrinkle-like deformation on a surface corresponding to the inside of the bend, and a gap is not formed between the bumper cover and the automobile. When the bumper cover collides and is deformed, the bumper line hose starts deforming at the same time so that the energy of the collision can be immediately absorbed.
DISCLOSURE OF THE INVENTION The present invention uses a high-strength steel sheet, deep-draws the steel sheet to form a hat shape at the center of the cross section, trims an external part to remove unnecessary parts, and presses the rising edge at both ends of the cross section. Bumper line hose having a substantially B-shaped closed cross-section formed by a process, a process of pressing an L-shaped inclined stand on both sides of the cross-section, and a process of pressing the cross-section from both sides and further pressing from above And a method of manufacturing such a bumper line hose.
In addition, a step of pressing the hat-shaped upper surface and the hat-shaped lower surface into a curved surface shape in a plan view while forming a hat shape in the center of the cross section by deep drawing a high-tensile steel sheet and a contour trimming process of removing unnecessary parts, Pressing the rise on both ends of the cross-section, pressing the L-shaped oblique rise on both sides of the cross-section, pressing the cross-section from both sides, pressing the cross-section from above, and pressing the outer surface into a curved surface in plan view Providing a bumper-line hose having a substantially B-shaped closed cross-section formed by the step of shaping, and a method of manufacturing such a bumper-line hose.
Further, it is a bumper line hose having a substantially B-shaped closed cross section, wherein the overall width dimension at the center in the longitudinal direction is maximized, and the overall width dimension is gradually reduced toward both end portions. Features.
Further, using a press die having a notch in a part thereof, the work was pressed, and then the press die was pulled up while pushing the work with a kicker, and the work was formed by a process including a press working method characterized by separating the work. It is characterized by providing a bumper-line hose and a method of manufacturing such a bumper-line hose.
BEST MODE FOR CARRYING OUT THE INVENTION A bumper line hose 1 having a substantially B-shaped closed section according to the present invention has a substantially B-shaped closed section manufactured from a high-strength steel sheet by a pressing process. is there.
The step of forming the hat shape 22 in the center of the cross section by deep drawing the steel plate includes the upper die 24 having the groove 25 having the same width b3 as the outer width of the hat shape 22 and the depth h1 equal to the height of the hat shape 22. A steel plate is sandwiched between a lower mold 27 having a projection b having the same width b4 as the inner width of the hat shape 22 and having the same height h2 as the height of the hat shape 22, pushing down the upper mold 24, and pressing and deep drawing. Process into section 20.
When giving a smooth curved surface to the outer surface 61 and the mounting surface 65 in the longitudinal direction in plan view, the lower surface 24a of the upper die 24 and the lower die 24 are formed so that the hat-shaped upper surface 23 and the hat-shaped lower surface 19 become curved surfaces, respectively. The shape of the upper surface 27a of the 27, the bottom surface 25a of the groove 25, and the tip surface 28a of the projection 28 are respectively curved surfaces.
Further, h1 and h2 are set to be smaller than the total width dimension H by twice the thickness t. When the total width H at the center in the longitudinal direction is maximized and the total width H at both ends is reduced, the dimensions h1 and h2 are also changed in accordance with the H dimension that changes depending on the position in the longitudinal direction.
In the step of trimming the deep drawn section 20, the FIG. 4, the tool hole, the wiring mounting hole, the mounting hole to the body of the automobile, the mounting hole for the bumper cover, etc. are formed in the hat-shaped lower surface 19, and the plate width dimension b8 is the full width dimension H. The trimmed cross section 21 is processed by performing cutting or the like so as to have an appropriate size according to the change.
The step of pressing the rising 32 at both ends of the cross section includes the upper mold 34 having the groove 35 with the same width b5 as the inner width of the lower part of the rising 32 and the width b6 equal to the outer width of the lower part of the rising 32. The trim section 21 is interposed between the lower mold 37 having the groove 38 having a protrusion 38c at the center thereof, and the upper mold 34 is pressed down to be processed into the rising section 31 by pressing down.
Here, the angle E of the vertical surface 38b of the groove 38 is an appropriate value in the range of 35 degrees to 90 degrees. FIG. As shown in FIG. 8, when the dimension H of the whole width is larger than the height B of the bumper line hose, the upper mold 44 and the ramp 42 do not interfere with each other even if the angle E is 90 degrees. This is because if the dimension H of the entire width is reduced, the upper die 44 and the inclined stand 42 interfere with each other unless the angle E is reduced. Note that FIG. In Example 1, the angle E was 80 degrees at the center of the bumper line hose 1, and the angle E was 45 degrees at the ends.
When the outer surface 61 and the mounting surface 65 are given a smooth curved shape in the longitudinal direction in plan view, the bottom surface 35a of the groove 35, the tip surface 38d of the projection 38c, the lower surface 34a of the upper mold 34, and the bottom surface 38a of the groove 38 are respectively formed. It has a curved shape.
When the total width H at the center in the longitudinal direction is maximized and the total width H at both ends is reduced, the dimensions b5 and b6 are changed according to the change of the total width H.
The step of pressing the L-shaped inclined stand 42 on both sides of the cross section includes the upper die 44 having the groove 45 and the groove 47 having the bottom surface 47a and the inclined surface 47b and having the projection 47c at the center thereof. The rising section 31 is sandwiched between the lower mold 46 and the lower mold 46, and the upper mold 44 is pressed down to form an L-shaped oblique section 41.
Here, the angle F of the slope 47b of the groove 47 is as shown in FIG. When the press work is started from both sides of the cross section shown in FIG. 10, the contact surface 42b of the inclined stand 42 slides in the arrow J direction with respect to the pressing surface 54a of the right die 54 and the pressing surface 55a of the left die 55.
The lower limit value of the angle varies depending on the material, surface hardness, surface roughness, presence / absence and type of oils and fats of the mold and the steel plate, and thus needs to be experimentally determined. Note that FIG. In Example 1, the angle F was set to 60 degrees.
When the outer surface 61 and the mounting surface 65 have a smooth curved shape in the longitudinal direction in plan view, the bottom surface 45a of the groove 45, the tip surface 47d of the projection 47c, the lower surface 44a of the upper mold 44, and the bottom surface 47a of the groove 47 are respectively formed. It has a curved shape.
A press die and a press method for press-working an L-shaped oblique top 42 on both sides of a cross section when the moving trajectory of the upper die 43 interferes with the tip 42a of the oblique top 42 that is a part of the work. One embodiment of the invention of FIG. 9 and will be described.
First, when the notch 43a is formed in the upper die 43 and press working is performed, the upper die 43 does not interfere with the tip 42a of the inclined stand 42. Further, a kicker 48 is provided to form a press die.
When such a press die is used to press down the upper die 43 for press working, the upper die 43 does not interfere with the tip 42a of the tip 42 which is a part of the work. Further, when the upper die 43 is pulled up while pushing the hat-shaped upper surface 23 which is a part of the work while pushing out the tip of the kicker 48, the L oblique section 41 can be easily separated from the upper die.
In the step of pressing from both sides of the cross section and further pressing from above, the L oblique section 41 is sandwiched between the right mold 54 and the left mold 55, and press working is performed from both sides of the cross section.
When a smooth curved shape is given to the outer surface 61 and the mounting surface 65 in the longitudinal direction in a plan view, the lower surface 56a of the upper mold 56 and the receiving surfaces 54b, 55b of the right mold 54 and the left mold 55 are curved.
When the total width H at the center in the longitudinal direction is maximized and the total width H at both ends is reduced, the dimension h3 between the lower surface 56a and the receiving surfaces 54b and 55b at the position where the upper die 56 is pressed down is set to the full width. Is changed in accordance with the change of the dimension H.
When the joint 52 is temporarily welded, spot welding is performed in a state where the sectional shape is clamped so as not to be distorted. In addition, seam welding, laser welding, plasma welding, or the like is preferably used as the step of main welding the joint 52. Thus, the bumper line hose 1 having the substantially B-shaped closed section 51 is completed.
Although it is appropriate that the tensile strength of 441~1177N / mm 2 as high-tensile steel plate, especially tensile strength 981~1177N / mm 2 things reasons for and economy to meet the demand for weight reduction preferable. The thickness of the high-strength steel sheet is suitably from 0.7 to 1.6 mm, but is preferably from 0.9 to 1.4 mm in order to meet the demand for weight reduction and from the viewpoint of economy.
In the above embodiment, the pressing direction is described as up and down or left and right. However, the present invention is not limited to this. The up and down may be reversed or the up and down may be changed to left and right or the left and right may be changed to up and down. Also, the press mold shown is merely one example, and is not limited to the illustrated press mold shape.
Although not mentioned in the above embodiment, a press die in consideration of springback generated after press working is used as necessary.
In this embodiment, the outer surface 61 of the substantially B-shaped closed cross section 51 is set to the outside of the vehicle, and the mounting surface 65 is mounted to the vehicle body. However, the present invention is not limited to this, and the reverse configuration may be considered.
INDUSTRIAL APPLICABILITY The bumper line hose according to the present invention uses a high-tensile steel plate and has a high sectional modulus and an excellent strength, so that a thinner high-tensile steel plate can be used. Therefore, a bumper-line hose that meets the demand for weight reduction while satisfying the required strength and functions such as energy absorption at the time of a collision can be obtained, and thus has high industrial applicability.
In addition, a bumper line hose having a cross section having a large second moment of area at a central portion where a large bending moment is applied in the case of a frontal collision, and a cross section having a small second moment of area at both ends where a relatively small bending moment is applied. Since it could be provided, its industrial applicability is high.
Further, a bumper line hose having a smooth curved shape in the longitudinal direction in a plan view is provided so that no gap is formed between the bumper cover and the bumper cover. For this reason, when the bumper cover of a car collides and deforms, the bumper line hose starts to deform immediately, and it is possible to provide a bumper line hose that absorbs the energy of the collision. high.
Further, a first step of forming a hat shape at the center of the cross section by deep drawing a high-tensile steel sheet, a second step of performing an outer shape trim processing for removing unnecessary portions, and a third step of pressing the rising edges at both ends of the cross section And a fourth step of pressing the L-shaped inclined stand on both sides of the cross section, a fifth step of pressing the cross section from both sides and further pressing from above, and a sixth step of fully welding the joint. The method of manufacturing the manufactured bumper line hose having a substantially B-shaped closed cross section provides a new manufacturing method and has high industrial applicability.
Further, a first step of deep-drawing a high-strength steel sheet to form a hat shape at the center of the cross section while pressing the hat-shaped upper surface and the hat-shaped lower surface into a curved shape in plan view, and performing an outer trim process for removing unnecessary portions. A second step, a third step of pressing the rising edge on both ends of the section, a fourth step of pressing an L-shaped inclined rising edge on both sides of the section, and pressing from both sides of the section, and further pressing from above. The method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising a fifth step of making the outer surface a curved surface in a plan view and a sixth step of fully welding the joint, is a new production method. It has high industrial applicability.
In addition, when the movement locus of the upper die interferes with a part of the work, the work is pressed by the kicker after pressing the work using a press die including a press die having a notch in a part thereof and a kicker. The invention of a manufacturing method having a process of lifting a press die while pressing is particularly useful in a bumper line hose where various shapes are required according to differences in the concept of safety design and differences in customer preferences etc. The nature is high.
[Brief description of the drawings]
FIG. FIG. 1 is a right half plan view of one embodiment of a bumper line hose according to the present invention. FIG. 2 is FIG. 1 is a sectional view taken along the line AA of FIG.
FIG. FIG. 3 is a view showing one embodiment of a step of pressing a hat-shaped upper surface and a hat-shaped lower surface into a curved surface shape in plan view while forming a hat shape at the center of the cross section by deep drawing a steel plate. FIG. 4 is FIG. 3 is a right half sectional view of the deep drawing section taken along line CC of FIG.
FIG. 5 is a cross-sectional view of a trim section after the outer trim processing. FIG. FIG. 6 is a view showing one embodiment of the step of pressing the rising on both sides of the cross section.
FIG. FIG. 7 is a view showing an embodiment of a step of pressing an L-shaped inclined stand on both sides of the cross section. FIG. FIG. 8 is a view showing one embodiment of a step of pressing an L-shaped inclined stand on both sides of the cross section when the total width H is larger than the height B of the cross section.
FIG. FIG. 9 is a view showing one embodiment of a press working step in the invention of a press die comprising a press die having a notch in a part thereof and a kicker.
FIG. FIG. 10 is a view showing one embodiment of a state in which press working is started from both sides of the cross section. FIG. FIG. 11 is a view showing an embodiment of a step of pressing a cross section from both sides and further pressing from above.

Claims (10)

  1. Bumper-line hose made of high-strength steel sheet. Deep-drawing high-strength steel sheet to form a hat shape at the center of the cross section. Trimming outer shape to remove unnecessary parts. And a step of pressing the L-shaped inclined stand on both sides of the cross section, a step of pressing the cross section from both sides and further pressing from above, and a step of fully welding the joint. A bumper line hose having a substantially B-shaped closed cross section.
  2. A bumper line hose made of high-strength steel plate, a process of deep drawing the high-tensile steel plate and forming a hat shape at the center of the cross section while pressing the hat-shaped upper surface into a curved shape in plan view, and removing the unnecessary parts. Trimming process, pressing process on both ends of the cross-section, pressing on L-shaped oblique rising on both sides of the cross-section, pressing the cross-section from both sides, and forming the outer surface from above into a curved surface A bumper line hose having a substantially B-shaped closed cross section and a smooth outer surface formed by a press working step and a main welding step of a joint portion.
  3. A step of pressing both the hat-shaped upper surface and the hat-shaped lower surface into a curved surface shape in a plan view while deep-drawing the high-tensile steel plate and forming a hat shape in the center of the cross section, and An external trim process for removing unnecessary parts, a process for pressing the rise at both ends of the cross section, a process for pressing the L-shaped inclined rise on both sides of the cross section, and a press process for the cross section from both sides and from above It has a substantially B-shaped closed cross section manufactured by the step of pressing the outer side surface into a curved shape and the step of main welding the joint, and both the outer side surface and the mounting surface have a smooth curved surface. A bumper lean hose characterized by the following.
  4. The bumper line hose according to any one of claims 1 to 3, wherein the step of pressing an L-shaped inclined stand on both sides of the cross section includes a press die having a cutout in a part thereof. A bumper line hose characterized in that it is a step of returning a press die while pressing a work by a kicker after use and pressing.
  5. The bumper-line hose according to any one of claims 1 to 3, wherein the overall width at the center in the longitudinal direction is maximized, and the overall width is gradually reduced toward both ends. Characterized bumper lean hose.
  6. 5. The bumper line hose according to claim 4, wherein the total width dimension at the center in the longitudinal direction is maximized, and the total width dimension is gradually reduced toward both ends.
  7. A first step of forming a hat shape at the center of the cross section by deep drawing of a high-tensile steel sheet, a second step of performing an external trim processing for removing unnecessary portions, and a third step of pressing the rising at both ends of the cross section; A fourth step of pressing the L-shaped inclined stand on both sides of the cross section, a fifth step of pressing the cross section from both sides, and further pressing from above, and a sixth step of fully welding the joint portion, A method of manufacturing a bumper line hose having a substantially B-shaped closed cross section.
  8. A first step of deep-drawing a high-tensile steel sheet to form a hat shape at the center of the cross section while pressing the upper surface of the hat shape into a curved shape in a plan view, a second step of performing an outer trim processing for removing unnecessary portions, and a cross section. A third step of pressing the rising edge on both ends, a fourth step of pressing an L-shaped inclined rising edge on both sides of the cross section, and pressing the cross section from both sides and further pressing from above to make the outer surface flat. A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising: a fifth step of visually forming a curved surface; and a sixth step of main welding the joint.
  9. The first step of deep-drawing a high-strength steel sheet to form a hat shape at the center of the cross section while pressing both the hat-shaped upper surface and the hat-shaped lower surface into a curved shape in a plan view, and performing an outer trim process for removing unnecessary portions A second step, a third step of pressing up the rise at both ends of the cross section, a fourth step of pressing an L-shaped inclined rise on both sides of the cross section, and a press work of the cross section from both sides and further press from above A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising: a fifth step of making the outer surface a curved surface in plan view;
  10. In the invention according to any one of claims 7 to 9, the fourth step of pressing the L-shaped inclined stand on both sides of the cross section uses a press die having a cutout in a part thereof, A method of manufacturing a bumper-line hose having a substantially B-shaped closed cross section, comprising a step of returning a press die while pressing a workpiece by a kicker after the pressing.
JP2002564066A 2001-02-14 2001-02-14 Bumper line hose having a substantially B-shaped closed cross section formed by press molding having a deep drawing process and a method of manufacturing the same Granted JPWO2002064284A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/001052 WO2002064284A1 (en) 2001-02-14 2001-02-14 Bumper lean hose with generally b-shaped closed section formed by press forming with deep drawing process and method of manufacturing the bumper lean hose

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JPWO2002064284A1 true JPWO2002064284A1 (en) 2004-06-10

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JP2002564061A Granted JPWO2002064277A1 (en) 2001-02-14 2001-08-15 Bumper line hose having a substantially B-shaped closed cross section which is quenched after press molding

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JP4828267B2 (en) * 2006-03-15 2011-11-30 アイシン高丘株式会社 Manufacturing method of products with closed cross-section by hot pressing
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JP4640481B2 (en) 2008-09-01 2011-03-02 マツダ株式会社 Method for producing metal closed section member
JP5077211B2 (en) * 2008-12-05 2012-11-21 トヨタ車体株式会社 Molded body having odd-shaped U-shaped portion and manufacturing method thereof
JP6447788B1 (en) 2017-03-15 2019-01-09 新日鐵住金株式会社 Method of manufacturing quenched member and quenched member

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