JP2000334528A - Pressed bumper reinforcement having substantially b- shaped closed section, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper reinforcement light in weight and high in safety by pressing a high tensile steel plate into a substantially B-shaped closed section, and permanently welding a joining part. SOLUTION: A high tensile steel plate is pressed into a U-shaped section. Then, a hat shape is pressed in a center of the section. Next, a riser is pressed on both ends of the section. In addition, a diagonal riser of the substantially angle shape is pressed on both sides of the section. Then, both sides of the section are pressed. Finally, a joining part is permanently welded. A bumper reinforcement 1 having substantially B-shaped closed section provided with a forward surface 61 and a rear surface 65 can be obtained. Since the bumper reinforcement 1 is large in section modulus and excellent in strength of each part, a thinner high tensile steel plate can be used. The bumper reinforcement to meet the request for weight reduction can be obtained while satisfying the functions of the necessary strength, the energy absorption during the collision, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper line hose used for improving the safety of an automobile by improving the rigidity of an automobile body or absorbing energy at the time of a collision. By using a B-shaped closed bumper line hose,
The present invention relates to providing a lightweight and highly safe bumper line hose.

[0002]

2. Description of the Related Art In many cases, a conventional bumper line hose has a thick C-shaped cross section. Japanese Patent No. 2,846,983 is known as an invention in which a high-strength steel plate is used to form a closed section.

A thick C-shaped cross section has to be heavy in weight in order to secure the cross-sectional strength, and when used, not only decreases the acceleration performance and fuel economy required for automobiles, but also decreases In addition, a large amount of fuel energy is consumed, and a large amount of air pollutants is emitted, which is contrary to modern social demands for preserving the global environment. In addition, a thick C-shaped cross section is rapidly destroyed when the horizontal flange buckles, so a high degree of care 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. 2,846,983 provides a bumper line hose having a substantially D-shaped closed cross section by roll forming. Becomes 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, so that the material must be heavy.

[0005] The bumper-line hose also has the required strength and energy absorption at the time of collision, and in particular, improves the running performance and fuel efficiency of automobiles while satisfying the functions of buckling with a moderate load at both ends. Therefore, there was a demand for further weight reduction, but this was not easily achieved. Furthermore, there was a request to reduce the bending radius of the camber bending process in the longitudinal direction due to the requirements of the structure of the automobile and the appearance from the customer's preference. Deformation occurred, and the deformation was not constant, so that a bumper line hose of the same quality could not be manufactured stably.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and has as its object to manufacture a high-strength steel sheet by a predetermined process. An object of the present invention is to provide a bumper line hose having a lightweight, highly safe, substantially B-shaped closed cross section.

Another object is to add a bead to a required portion such as a front surface or a rear surface, or an upper surface or a lower surface, to increase a strength only in a portion where a cross-sectional strength is required, and to increase a strength in a portion required to buckle under an appropriate load. Is to provide a lighter and more secure bumper line hose by adopting a structure without adding a bead.

Another object is to intermittently apply a bead to a rear surface inside a camber bending portion in a longitudinal direction, thereby allowing a constant shape deformation at a predetermined position on the rear surface and a bending radius of a camber bending process. It is an object of the present invention to make it possible to stably produce a bumper line hose of the same quality with a reduced size.

[0009]

SUMMARY OF THE INVENTION The present invention is to provide a straight bumper-line hose using a high-tensile steel plate and having a substantially B-shaped closed cross section manufactured by a predetermined process. And a method for producing a simple bumper-line hose. Further, a bumper line hose having a substantially B-shaped closed cross section manufactured by a predetermined process and a step of performing a camber bending process in a longitudinal direction in a plan view, a bead applied to the cross section, and a camber bending process in a longitudinal direction. It is characterized in that the bending radius is reduced and a method for producing such a bumper-line hose is provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. A bumper line hose having a substantially B-shaped closed cross section according to the present invention has a substantially B-shaped closed cross section manufactured from a high-strength steel sheet by a predetermined process. First, a process of forming a substantially B-shaped closed cross section will be described. However, if a necessary drilling process such as a mounting hole or a working hole is performed in a state of a plate in advance, efficient processing can be performed.

The step of pressing the section into a substantially U-shape is performed between the upper mold 14 having the same width b1 as the inner width of the section 11 and the lower mold 16 having the groove 17 having the same width b2 as the outer width of the section 11. , A high-tensile steel sheet is sandwiched between them, and the upper mold 14 is pressed down and pressed.

The step of pressing the hat shape 22 at the center of the cross section is performed by the upper die 24 having a groove 25 having the same width b3 as the outer width of the hat shape 22 of the cross section 21 and the same depth h1 as the height of the hat shape 22. And a lower mold 27 having a protrusion b having the same width b4 as the inner width of the hat shape 22 and the same height h2 as the height of the hat shape 22, the upper mold 24 is pressed down and pressed. The configuration is as follows.

The step of pressing the rising portions 32 and 33 at both ends of the cross section includes forming the upper mold 34 having the groove 35 having the same width b5 as the inner width of the rising portions 32 and 33 of the section 31 and the rising portions 32 and 33 of the cross section 31. Groove 3 with the same width b6 as the outer width
8 between the lower mold 37 and the upper mold 34.
And press-work.

The step of pressing the oblique rising portions 42 and 43 having a substantially angle iron shape on both sides of the cross section includes an upper die 44 having a groove 45 and a bottom surface 50 having the same width b7 as the lower surface width of the cross section 41.
Mold 46 having a groove 47 composed of
And the upper die 44 is pressed down and pressed.

In the step of pressing from both sides of the cross section, the cross section 41 is sandwiched between the right mold 54 and the left mold 55 to perform the press work. In the step of temporarily welding the joint portion 52, spot welding is performed in a state where the sectional shape is clamped so as not to be distorted. In the step of main welding the joint portion 52, seam welding is performed. By the above steps, the substantially B-shaped closed cross section 51 is completed and used as a straight bumper-line hose.

The process of bending the camber in the longitudinal direction in plan view includes the front surface 61 of the bumper line hoses 1, 2, and 3,
Between the upper mold having the same longitudinal shape as 62 and 63 and the lower mold having the same longitudinal shape as the rear surfaces 65, 66 and 67, the closed mold 51 is sandwiched so that the upper mold is pressed down and pressed. Constitute.

On the other hand, the step of pressing the hat-shaped upper surface and a part of the center of the front surface by press working from both sides of the cross section is performed by pressing the projections 7 in the state shown in FIG.
The upper surface 23 and the central front portion 64 are sandwiched between the upper die 71 having the groove 2 and the lower die 74 having the groove 73, and the hat-shaped upper surface 23 and the central front portion 6 are pressed.
Step 4 is a step of plastically deforming and caulking.

[0018] The main welding and the camber bending in the longitudinal direction in the plan view are performed after the pre-caulking and temporary welding are performed in order to maintain a constant cross-sectional shape in the main welding and to perform the camber bending in the longitudinal direction in the plan view. The temporary joining is performed to prevent the cross-sectional shape from being deformed by the processing. Therefore, caulking and temporary welding may be usually performed at a pitch of 100 to 300 mm.

When beads 6, 7, 8 and 9 are to be applied to the rear surface 66 and the rear surface 67 of the bumper line hose 2 and the front surface 63 and the rear surface 67 of the bumper line hose 3, a step of pressing a hat shape at the center of the cross section (the ninth step). In FIG. 2), the upper and lower press dies are widened, and grooves and projections corresponding to the shapes of the bead shapes 6, 7, 8, and 9 are added to the respective positions in advance. If you apply the bead intermittently,
A press die having a bead-shaped groove or protrusion intermittently is used.

In the case of camber bending in the longitudinal direction in plan view, if the bending radius R is reduced, the rear surface corresponding to the inside is deformed, and the deformation is not constant, but the rear surface 66 inside the camber bending portion is deformed. When the camber bending process was performed after intermittently applying the bead, the deformation occurred at the break portion 5 of the bead and the shape of the deformation was constant. For this reason, although it is necessary to tolerate a certain deformation, a bumper line hose having the same quality can be stably manufactured.

The high tensile strength steel sheet has a tensile strength of 60 to
120 kgf / mm, but the ² things are suitable, preferred for reasons for and economy to meet the demand for weight reduction particularly tensile strength 100~120kgf / mm ^2. The high-strength steel sheet preferably has a thickness of 0.7 to 1.6 mm. However, a high-strength steel sheet having a thickness of 0.9 to 1.4 mm is particularly preferable in order to meet the demand for weight reduction and for economic reasons.

As described above, a bumper line hose having a substantially B-shaped closed cross section 51 could be easily manufactured. In addition, a bumper-line hose having a bead continuously or intermittently applied to its cross section and a camber bending process having a small bending radius could be easily manufactured.

In the above embodiment, the pressing direction is described as up / down or left / right. However, the present invention is not limited to this, and the pressing direction may be reversed, up / down may be changed to left / right, or left / right may be changed to up / down. Absent. Also, the illustrated press mold is merely one example, and is not limited to the illustrated press shape. Further, in the present embodiment, the front faces 61, 62, 63 of the substantially B-shaped closed cross section 51 are configured to be the front faces of the automobile. However, the present invention is not limited to this, and the rear faces 65, 66, 67 are designated as the front faces of the automobile. May be configured. Further, in the present embodiment, the embodiment in which the camber bending process in the plan view longitudinal direction is performed by pressing is described. However, this process can be performed by rolling, and is not limited to the described embodiment. Further, in this embodiment, the method of plastically processing the bumper line hose itself has been described for caulking, but holes are previously formed in the hat-shaped upper surface 23 and the front center portion 64, and after the pins are inserted into the holes, the pins are formed. A method may be employed in which the shaft portion is hit and deformed, and then caulked.

[0024]

The bumper lean hose according to the present invention is
Since the section modulus is high and each part has a shape excellent in strength, a thinner high-tensile steel sheet can be used. Therefore, it was possible to provide a bumper line hose that satisfies the required strength and functions such as energy absorption at the time of collision, and that meets the demand for weight reduction.

Further, in a case where after the step of pressing from both sides of the cross-section and caulking and joining the upper surface of the hat shape and a part of the center of the front surface, a step of camber bending in the longitudinal direction in plan view is performed and finally a step of welding. Means that the welding process is performed after all the pressing processes are completed. In this case, by using a transfer press or the like that can perform a multi-step press working with one unit, the line configuration of the equipment was simplified and the space could be efficiently used. Furthermore, it has become possible to reduce the production cost of the equipment and the bumper line hose.

In addition, a bead is added to the front surface or the rear surface, so that the strength is increased only in the portion where the cross-sectional strength is required,
A structure that does not add beads to parts that are required to buckle with an appropriate load, thereby satisfying the required strength and functions such as energy absorption at the time of collision, and a bumper lining that meets the demand for further weight reduction Hose could be provided.

Also, by intermittently applying a bead to the rear surface inside the camber bending portion in the longitudinal direction in plan view, the bending radius R of the camber bending process can be reduced while allowing a certain shape deformation at a predetermined position on the rear surface. It is now possible to stably produce a smaller bumper line hose of the same quality.

Also, a high-strength steel plate is used, and its cross section is roughly U
A first step of pressing into a letter shape, a second step of pressing a hat shape at the center of the cross section, a third step of pressing the rising at both ends of the cross section, and a diagonal rising of approximately angle steel shape on both sides of the cross section To provide a method for manufacturing a bumper line hose having a substantially B-shaped closed cross section, which is manufactured by a fourth step of performing a pressing step from both sides of a cross section, a fifth step of pressing a joint, and a sixth step of welding a joint. Was completed.

Further, a high-strength steel plate is used, and its cross section is roughly U
A first step of pressing into a letter shape, a second step of pressing a hat shape at the center of the cross section, a third step of pressing the rising at both ends of the cross section, and a diagonal rising of approximately angle steel shape on both sides of the cross section A fourth step, a fifth step of press working from both sides of the cross section, a sixth step of temporarily welding the joint, a seventh step of main welding the joint, and an eighth step of camber bending in the longitudinal direction in plan view. Process
A method for manufacturing a bumper line hose having a substantially B-shaped closed cross section can be provided.

Further, a high-strength steel plate is used, and its cross section is roughly U
A first step of pressing into a letter shape, a second step of pressing a hat shape at the center of the cross section, a third step of pressing the rising at both ends of the cross section, and a diagonal rising of approximately angle steel shape on both sides of the cross section A fourth step, a fifth step of press working from both sides of the cross section, a sixth step of temporarily welding the joint, a seventh step of camber bending in the longitudinal direction in plan view, and an eighth step of main welding the joint. Process
A method for manufacturing a bumper line hose having a substantially B-shaped closed cross section can be provided.

Further, a high-strength steel plate is used, and its cross section is roughly U
A first step of pressing into a letter shape, a second step of pressing a hat shape at the center of the cross section, a third step of pressing the rising at both ends of the cross section, and a diagonal rising of approximately angle steel shape on both sides of the cross section A fourth step of performing press working from both sides of the cross section, caulking and joining a part of the hat-shaped upper surface and a central part of the front face, a sixth step of welding the joined part, and performing camber bending in the longitudinal direction in plan view. A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising the seventh step, could be provided.

Further, a high-strength steel plate is used, and its cross section is roughly U
A first step of pressing into a letter shape, a second step of pressing a hat shape at the center of the cross section, a third step of pressing the rising at both ends of the cross section, and a diagonal rising of approximately angle steel shape on both sides of the cross section A fourth step of pressing from both sides of the cross-section, a fifth step of caulking and joining a part of the hat-shaped upper surface and a central portion of the front face, a sixth step of camber bending in the longitudinal direction in plan view, and welding the joints. A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising the seventh step, could be provided.

[Brief description of the drawings]

FIG. 1 is a right half plan view of a bumper line hose having a substantially B-shaped closed cross section.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a right half plan view of a bumper line hose in which beads are intermittently applied.

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is a view taken in the direction of arrow D in FIG. 3;

FIG. 6 is a right half plan view of a bumper line hose continuously provided with beads.

7 is a sectional view taken along the line EE in FIG. 6;

FIG. 8 is a view showing one embodiment of a step of pressing a cross section into a substantially U-shape.

FIG. 9 shows a step 1 of pressing a hat shape at the center of the cross section.
It is a figure showing an example.

FIG. 10 is a view showing one embodiment of a step of pressing the rising on both sides of the cross section.

FIG. 11 is a view showing one embodiment of a step of pressing obliquely rising of a substantially angle steel shape on both sides of a cross section.

FIG. 12 is a view showing one embodiment of a step of performing press working from both sides of a cross section.

FIG. 13 is a view showing one embodiment of a caulking step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bumper lean hose 2 ... Bumper lean hose 3 ... Bumper lean hose 5 ... Break part 6 ... Bead 7 ... Bead 8 ... Bead 9 ... Bead 11 ... · Cross section 14 ··· Upper mold 16 ··· Lower mold 17 ··· Groove 21 ··· Cross section 22 ··· Hat 23 ··· Upper surface 24 ··· Upper mold 25 ··· Groove 27 · .. Lower mold 28 ... Protrusion 31 ... Cross section 32 ... Rise 33 ... Rise 34 ... Upper mold 35 ... Groove 37 ... Lower mold 38 ... Groove 41 ... Cross section 42 ··· Diagonal rise 43 ··· Diagonal rise 44 ··· Upper die 45 ··· Groove 46 ··· Lower die 47 ··· Groove 48 ··· Slope 49 ··· Slope 50 ···・ Bottom 51 Closed section 52 ··· Joining part 54 ··· Right type 55 ··· Left type 61 ··· Front face 62 ··· Front face 63 ··· Front face 64 ··· Front center part 65 ··· Rear face 66 ···・ Rear surface 67 ・ ・ ・ Rear surface 71 ・ ・ ・ Upper die 72 ・ ・ ・ Projection 73 ・ ・ ・ Groove 74 ・ ・ ・ Lower die

Claims (10)

[Claims] 1. A step of using a high-tensile steel sheet to press a section into a substantially U-shape, a step of pressing a hat shape at the center of the section, a step of pressing a rise at both ends of the section, and Manufactured by a step of pressing the oblique rising of the approximate angle iron shape, a step of pressing from both sides of the cross section, and a step of fully welding the joint,
A bumper line hose having a substantially B-shaped closed cross section. 2. A step of using a high-tensile steel sheet to press the cross section into a substantially U-shape, a step of pressing a hat shape at the center of the cross section, a step of pressing a rise at both ends of the cross section, and a step of pressing both sides of the cross section. Pressing the oblique rising of the approximate angle steel shape, pressing from both sides of the cross section, temporarily welding the joint, performing camber bending in the longitudinal direction in plan view, and performing full welding of the joint Bumper line hose having a substantially B-shaped closed cross section manufactured by the above steps. 3. A step of using a high-strength steel sheet to press a section into a substantially U-shape, a step of pressing a hat shape at the center of the section, a step of pressing a rise at both ends of the section, and a step of pressing both sides of the section. A step of pressing the oblique rising of the approximate angle iron shape, a step of pressing from both sides of the cross section, and caulking and joining a part of the hat-shaped upper surface and a part of the center of the front face, and a step of camber bending in the longitudinal direction in plan view,
A bumper line hose having a substantially B-shaped closed cross section, which is manufactured by the step of main welding a joint. 4. The bumper line hose according to claim 1, wherein a bead is applied to a cross section of the hose. 5. The bumper line hose according to claim 1, wherein a bead is intermittently applied to a rear surface corresponding to an inner side of the camber bent portion in a longitudinal direction in plan view. A bumper lean hose characterized by the following. 6. A first step of pressing a cross section into a substantially U-shape using a high-tensile steel sheet, a second step of pressing a hat shape at the center of the cross section, and a third step of pressing a rise at both ends of the cross section. A fourth step of pressing the oblique rising of the approximate angle steel shape on both sides of the cross section, a fifth step of pressing from both sides of the cross section, and a sixth step of main welding the joint.
A method of manufacturing a bumper line hose having a substantially B-shaped closed cross section manufactured by the above steps. 7. A first step of pressing a cross section into a substantially U-shape using a high-tensile steel sheet, a second step of pressing a hat shape at the center of the cross section, and a third step of pressing a rise at both ends of the cross section. A fourth step of pressing the oblique rising of the approximate angle iron shape on both sides of the cross section, a fifth step of pressing from both sides of the cross section, and a sixth step of temporarily welding the joint.
A method for producing a bumper line hose having a substantially B-shaped closed cross-section, comprising a step, a seventh step of performing full welding of the joint, and an eighth step of performing camber bending in a longitudinal direction in plan view. 8. A first step of pressing a cross section into a substantially U-shape using a high-tensile steel sheet, a second step of pressing a hat shape at the center of the cross section, and a third step of pressing a rise at both ends of the cross section. A fourth step of pressing the oblique rising of the approximate angle iron shape on both sides of the cross section, a fifth step of pressing from both sides of the cross section, and a sixth step of temporarily welding the joint.
Step 7: camber bending in the longitudinal direction in plan view
A method for producing a bumper line hose having a substantially B-shaped closed cross-section, comprising a step and an eighth step of main-welding the joint. 9. A first step of pressing a U-shaped section using a high-tensile steel sheet, a second step of pressing a hat shape at the center of the section, and a third step of pressing a rising edge at both ends of the section. A fourth step of pressing the oblique rising of the approximate angle iron shape on both sides of the cross section, a fifth step of pressing from both sides of the cross section, and caulking and joining a part of the hat-shaped upper surface and the center of the front surface, A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising a sixth step of main welding and a seventh step of camber bending in a longitudinal direction in plan view. 10. A first step of pressing a U-shaped section using a high-tensile steel sheet, a second step of pressing a hat shape at the center of the section, and a third step of pressing a rising edge at both ends of the section. A fourth step of pressing the oblique rising of the approximately angle steel shape on both sides of the cross section, a fifth step of pressing from both sides of the cross section, and caulking and joining a part of the hat-shaped upper surface and a central portion of the front surface, A method for producing a bumper line hose having a substantially B-shaped closed cross section, comprising: a sixth step of performing camber bending in a direction; and a seventh step of performing full welding of a joint.