JP2008189311A - Load receiving article for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load receiving article for a vehicle capable of increasing energy absorption amount with respect to total weight. <P>SOLUTION: In an impact beams 1 for a door serving as the load receiving article for the vehicle and having a long narrow shape, a swelling part 2 is formed at the center or approximately the center in the width direction. Both sides in the width direction of the swelling part 2 are bottom parts 3, and end parts on the outer sides in the width direction of the bottom parts 3 are flange parts 4 erected to the same direction as that of the swelling part 2. At the center or approximately the center in the width direction of the swelling part 2, a valley part 5 recessed to the side opposite to the swelling direction of the swelling part 2 is provided. The swelling part 2, the bottom parts 3, the flange parts 4 and the valley part 5 are continuously formed from one end to the other end in the length direction of the impact beam 1. Erected parts 6 on both sides in the width direction of the swelling part 2 are formed in parallel or approximately parallel with the application direction A of a load. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle load receiving article provided in a vehicle for receiving a load, a method for manufacturing the vehicle load receiving article, and an apparatus for manufacturing the vehicle load receiving article. It can be used for load receiving articles for vehicles such as door impact beams and bumper beams.

  Conventionally, a door provided on the side of a four-wheeled vehicle is provided with an impact beam for receiving a load caused by a side collision, and is a load receiving article for a vehicle, and the longitudinal direction is arranged with the longitudinal direction of the vehicle. With this impact beam, the overall strength of the door against side collision is improved.

  As a conventional example of such an impact beam, the shape of the cross section orthogonal to the length direction is an open shape that is open because one end and the other end are not connected like a hat shape. (For example, Patent Document 1 below) and the cross-sectional shape orthogonal to the length direction are closed because one end and the other end are connected like a pipe. And a closed shape (for example, Patent Document 2).

These impact beams have an upright portion that has a component that is parallel to the direction of action of the load due to a side collision and that stands up from another portion, and this upright portion has a component that is perpendicular to the direction of action of the load. The vehicle has a length in the longitudinal direction of the vehicle, and an arbitrary part of the standing part in the length direction and the other part in the same place in the length direction with this part , Have the same thickness.
JP-A-10-166860 (FIGS. 1 and 2) JP-A-11-129756 (FIGS. 1, 3 and 5)

  In recent years, in order to improve the fuel consumption of a vehicle, it has been required to reduce the weight of members constituting the vehicle, thereby reducing the weight of the entire vehicle. To meet such demands, the weight of load bearing articles for vehicles such as impact beams must be reduced, but this reduction in weight reduces the amount of energy that can be absorbed when subjected to a load such as a collision load. It must be possible to achieve without reduction, and it is required to increase the amount of energy absorption with respect to the total weight of the vehicle load receiving article. Conventional load receiving articles for vehicles have not been designed and manufactured from the viewpoint of increasing the amount of energy absorption relative to the total weight in this way.

  An object of the present invention is to provide a vehicle load receiving article, a manufacturing method thereof, and a manufacturing apparatus thereof capable of increasing the amount of energy absorption with respect to the entire weight.

  The vehicle load receiving article according to the present invention includes a rising portion that has a component parallel to the load acting direction and stands up from another portion, and the standing portion is perpendicular to the load acting direction. A load receiving article for a vehicle having a length in a direction including: at least a part of the upright portion in the length direction is more than the other part at the same position in the length direction as the at least part Is a thick part having a large thickness.

  According to this vehicle load receiving article, the upright portion has a component parallel to the load acting direction and rises from other portions, and at least a part of the upright portion in the length direction is at least Since the thick portion is thicker than the other portion in the same place in the length direction with a part, the strength of the standing portion against deformation when the vehicle load receiving article receives a load, It is larger than the case where the standing part is not a thick part.

  For this reason, when the vehicle load receiving article is bent by receiving a load, the amount of bending until the standing portion is greatly deformed and becomes a buckled state can be increased. The amount of energy that can be absorbed when received is increased.

  In other words, in the present invention, when the thickness of the upright portion that contributes to the amount of energy absorption is larger than the other parts of the vehicle load receiving article, and the load receiving article for the vehicle starts to bend due to receiving the load. Until the amount of bending increases, the upright portion does not deform greatly and does not buckle. For this reason, when compared with the vehicle load receiving article in which the upright portion and the other portion have the same thickness and have the same weight as the vehicle load receiving article according to the present invention, the energy absorption amount Can be increased. Alternatively, when the upright portion and the other portion have the same thickness and are compared with a vehicle load receiving article having a weight greater than that of the vehicle load receiving article according to the present invention, energy absorption is performed. The amount can be the same or larger.

  Therefore, according to the present invention, the amount of energy absorption with respect to the entire weight of the vehicle load receiving article can be increased as compared with the prior art, and two contradictory problems of weight reduction of the vehicle load receiving article and increase of the energy absorption amount are achieved. Can also be solved.

  In the vehicle load receiving article according to the present invention described above, the number of thick portions may be one or a plurality of thick portions separated in the thickness direction. That is, in the latter case, a plurality of the upright portions are provided apart from each other in the thickness direction of the upright portion, and the thick portion is provided for all of the upright portions or a plurality of the upright portions. Provided.

  If the number of the thick portions is a plurality separated from each other in the thickness direction of the thick portions, the resistance against the deformation of the standing portions is improved accordingly, so that the amount of energy absorption can be further increased.

  Further, when the vehicle load receiving article is attached to the vehicle body or the vehicle body constituent member at a plurality of locations separated in the length direction, the central portion or the substantially central portion between the two adjacent attachment locations is the thick portion. It is preferable to do. According to this, the portion where the bending moment is maximized when the load receiving article for a vehicle receives a load can be a thick portion. Further, since the thick portion is only a part of the upright portion in the length direction, the overall weight of the vehicle load receiving article can be reduced accordingly.

  In this way, when the central portion or the substantially central portion between two adjacent mounting locations is a thick portion, and there are three or more mounting locations, each central portion or the substantially central portion May be a thick part, or only a specific central part or a substantially central part may be a thick part.

  Further, a plurality of thick portions are provided apart from each other in the thickness direction of the thick portion, and the vehicle load receiving article is attached to the vehicle body or the vehicle body constituent member at a plurality of locations separated in the length direction. In the case where the central portion or the substantially central portion between two adjacent attachment points is a thick portion, at least two thick portions adjacent to each other among the plurality of thick portions are selected. The thick-walled portion is connected at the end in the standing direction, and the thickness-direction dimension of the thick-walled portion is not the thick-walled portion with respect to the lengthwise portion provided with the thick-walled portion. It is preferable to make it larger than the dimension in the thickness direction of the thick part with respect to the part in the length direction.

  According to this, the section modulus at the portion where the bending moment when the vehicle load receiving article receives a load can be increased, and the bending moment can be effectively dealt with.

  The portion of the vehicle load receiving article that is attached to the vehicle body or the vehicle body constituting member is produced separately from the vehicle load receiving article, such as a bracket member, and the vehicle load receiving article and spot welding, bolts, nuts, etc. It may be a member coupled by a coupling tool, or may be a part of a vehicle load receiving article and formed integrally with a main body of the vehicle load receiving article.

  The method for manufacturing a load receiving article for a vehicle according to the present invention includes an upright portion that has a component parallel to the direction of action of the load and stands up from another portion, and the upright portion is perpendicular to the direction of action of the load. And at least a portion of the upright portion in the length direction is thicker than at least a portion of the upright portion and the other portion at the same position in the length direction. Is a method for manufacturing a load receiving article for a vehicle having a large thick portion, wherein the portion of the plate material that is to be the thick portion is a curved portion that curves and projects in the thickness direction of the thick portion. The curved portion forming step for forming and the curved portion forming step is performed, and the curved portion is linearly pressed by pressing the curved protruding side surface of the bending portion to the side opposite to the curved protruding side. Or increased in thickness due to a substantially linear shape Is to wherein a, a thickening step for deforming to thick portion that is To be.

  According to this manufacturing method, since the dimension is shortened when the curved portion is deformed into a linear or substantially linear shape, the thickness is increased by the shortened dimension, thereby increasing the thickness. A thick part can be obtained.

  As described above, the thickening step for obtaining the thickened portion that is thickened by deforming the curved portion into a linear or substantially linear shape may be performed only once, or may be performed multiple times. Also good.

  The method for manufacturing a load receiving article for a vehicle in which the thickening step is performed a plurality of times is performed after the thickening step, which is the first thickening step, and the thickness obtained in the first thickening step. A curving step for curving the meat portion by reducing the size in the standing direction of the portion to be the standing portion while maintaining the same or substantially the same thickness as the increased thickness; The thick portion is further linearly or substantially linearly formed by pressurizing the curved protrusion side surface of the thick portion, which is implemented later, to the opposite side of the curved protrusion side. A second thickening step for the purpose.

  When the thickness increasing step is performed a plurality of times, the thickness of the thick portion can be increased by an amount corresponding to the number of times.

  In the above manufacturing method, pressing the surface on the curved protruding side to the side opposite to the curved protruding side may be performed by a pressing force by a press die or by a liquid pressure by a liquid sealed in a bag. Alternatively, it may be performed by an elastic force by an elastic member that is elastically deformable.

  Further, the method for manufacturing a load receiving article for a vehicle according to the present invention includes an upright portion that has a component parallel to the direction of action of the load and stands up from another portion, and this upright portion is the direction of action of the load. A length in a direction having a component perpendicular to the vertical direction, and at least a portion of the upright portion in the length direction is more than at least a portion of the upright portion and the other portion at the same position in the length direction. A method of manufacturing a load receiving article for a vehicle having a thick portion having a large thickness, wherein the thickness of this portion is obtained by joining another plate material to the portion to be the thick portion in the plate material. A thickness increasing step for increasing the thickness to be larger than the thickness of the portion to be the other portion, and after the thickness increasing step, by pressing the plate material including the other plate material, the thickness is increased. The part having a large diameter is defined as the thick part. Is to wherein a, a press molding process for.

  According to this manufacturing method, it is possible to provide a portion having substantially the same thickness as the thick portion by a simple operation of joining another plate material to the portion to be a thick portion in the plate material. Since the plate material including the other plate material may be press-molded, it is possible to facilitate the manufacturing operation and improve the manufacturing operation efficiency.

  Further, the method for manufacturing a load receiving article for a vehicle according to the present invention includes an upright portion that has a component parallel to the direction of action of the load and stands up from another portion, and this upright portion is the direction of action of the load. The vehicle load receiver has a length in a direction having a component perpendicular to the vertical direction, and all of the upright portions in the length direction are thicker than the other portions. A roll forming forming step for forming a thick portion to be the thick portion in a part of the width direction of the plate material by roll forming the plate material in a method for producing an article, It is carried out after this roll forming step, and has a press forming step for making the portion having a large thickness into the thick portion by press forming the plate material.

  In this manufacturing method, a thick portion to be a thick portion is formed in a part in the width direction of the plate material by roll forming the plate material. Therefore, in this manufacturing method, the thick portion is an upright portion. It is suitable when it is provided over the entire length in the length direction. And since the board | plate material used as the material of the load receiving article for vehicles is a coil material continuously roll-formed, it can be used for many vehicles by cutting the coil material after roll-forming to a predetermined length. A large number of materials for producing a load receiving article by press molding can be easily obtained.

  An apparatus for manufacturing a load receiving article for a vehicle according to the present invention includes an upright portion that has a component parallel to an action direction of a load and stands up from another portion, and the upright portion is perpendicular to the action direction of the load. And at least a portion of the upright portion in the length direction is thicker than at least a portion of the upright portion and the other portion at the same position in the length direction. Is a device for manufacturing a vehicle load receiving article having a large thickness portion, and includes a clamping member that clamps a portion to be the other portion, and a portion to be the thick portion. The curved portion protruding in the thickness direction of the thick-walled portion is linearly or substantially linearly shaped by pressurizing the curved protruding side surface of the curved portion to the side opposite to the curved protruding side. It is changed to the thick part that has become thickened And it is characterized in that it comprises a, a pressure member for causing.

  According to this manufacturing apparatus, the portion that should be the other portion that is not thickened is sandwiched by the sandwiching member and is immovable, and the curved portion that is to be thickened and becomes the thick portion is Since the curved protrusion side surface is pressurized to the opposite side of the curved protrusion side, the curved portion is deformed into a linear or substantially linear shape while being compressed, and the thickened portion increased by the compression is deformed. It can be formed.

  The pressurizing member in this manufacturing apparatus may be a press mold, a liquid sealed in a bag, or an elastic member that is elastically deformable.

  Moreover, the present invention described above can be applied to any load receiving article for a vehicle. A typical example is a door impact beam, and another example is a bumper beam. In addition to this, the present invention can be applied to a center pillar, a side sill arranged on a floor panel, and the like. When the present invention is applied to a bumper beam, the bumper beam may be a front bumper beam or a rear bumper beam.

  Further, the present invention provides a vehicle load receiving article having an open shape in which the shape of the cross section perpendicular to the length direction is open because one end and the other end are not connected, The present invention can be applied to both a vehicle load receiving article having a closed shape that is closed because one end and the other end are connected. The closed shape may be a polygonal shape such as a quadrangle, a circle, an oval, an ellipse, or any other shape.

  Moreover, the material of the vehicle load receiving article according to the present invention may be a steel plate of high strength steel or a steel plate having a lower tensile strength than that of high strength steel.

  In addition, for vehicle load receiving articles that require some or all of the hardness of a predetermined value or more, quenching may be performed by rapidly cooling after heating to a high temperature by a high-frequency induction current, gas flame, laser, or the like. . Further, the quenching treatment may be performed after the vehicle load receiving article having a predetermined shape is formed from the material, or may be performed when the material is before the vehicle load receiving article having the predetermined shape is formed. . Further, the vehicle load receiving article to be press-molded may be rapidly cooled when press-molding a material heated to a high temperature, or may be performed when press-molding heating to a high temperature and quenching. That is, you may perform the hardening process by a hot press.

  According to the present invention, it is possible to increase the amount of energy absorbed with respect to the entire weight of the vehicle load receiving article.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. The vehicle load receiving article according to the present embodiment is an impact beam disposed on a side door of a four-wheel vehicle.

  FIG. 1 shows the impact beam 1. The impact beam 1 is disposed between the inner panel 10 and the outer panel in a door formed including an inner panel 10 on the vehicle inner side and an outer panel on the outer side of the vehicle, also referred to as a skin panel. 1 shows an impact beam 1 and an inner panel 10. The impact beam 1 formed of a steel plate as a material has two locations on the inner panel 10 at both ends in the longitudinal direction that is the vehicle longitudinal direction, or two locations in the vicinity of one end and the other end. The bracket members 11 and 12 coupled to the impact beam 1 are joined to the inner panel 10 by spot welding.

  FIG. 2 is a perspective view showing the entire impact beam 1 before being attached to the inner panel 10 and excluding the bracket members 11 and 12. 3 is a sectional view taken along line S3-S3 in FIG. 2, FIG. 4 is a sectional view taken along line S4-S4 in FIG. 2, and FIG. 5 is a sectional view taken along line S5-S5 in FIG. . As shown in these drawings, a raised ridge 2 is formed at the center or substantially the center of the width of the impact beam 1 that is elongated in the vehicle front-rear direction. Both sides in the direction are bottom portions 3, and end portions on the outer side in the width direction of the bottom portions 3 are flange portions 4 rising to the same side as the raised portions 2. In addition, a trough 5 is provided at the center in the width direction or substantially in the center of the ridge 2, which is recessed toward the opposite side of the ridge 2.

  As shown in FIG. 2, the raised portion 2, the bottom portion 3, the flange portion 4 and the valley portion 5 are continuously formed from one end to the other end in the length direction of the impact beam 1. Further, as shown in FIGS. 3 to 5 showing a cross section of the impact beam 1 orthogonal to the length direction, the impact beam 1 is not connected to one end portion in the width direction and the other end portion. It has an open cross-sectional shape.

  As shown in FIG. 1, the impact beam 1 is attached to the inner panel 10 via the bracket members 11 and 12 with the raised portion 2 facing the outside of the vehicle. For this reason, when the side collision load is applied to the door, the direction of the load is the A direction shown in FIG. Therefore, the surface on both sides in the width direction of the raised portion 2 is a raised portion 6 that has a component parallel to the load acting direction A and rises from the bottom portion 3. In the embodiment shown in the drawings, The upright part 6 stands linearly or substantially linearly from the bottom part 3 and is parallel or substantially parallel to the load acting direction A.

  As shown in FIG. 3, the width dimension of the impact beam 1 at the center in the length direction of the impact beam 1 or substantially at the center is W1, and as shown in FIG. The width dimension of the impact beam 1 at a position slightly closer to one end in the length direction is W2, and as shown in FIG. 5, the length direction is further from the center in the length direction of the impact beam 1 or from substantially the center. The width dimension of the impact beam 1 at a location close to one end of is W3. W2 is larger than W3, and W1 is larger than W2. Thus, the width dimension of the impact beam 1 is the largest at the center or substantially the center in the length direction of the impact beam 1, and the width dimension gradually increases from the center or the center to both ends in the length direction. The minimum width dimension is continuous to both ends in the length direction from a position that is smaller and a predetermined distance away from the center or substantially the center.

  For this reason, the distance between the two bottom parts 3 on the both sides in the width direction of the impact beam 1, the distance between the two flange parts 4, and the distance between the two upright parts 6 are the center in the longitudinal direction of the impact beam 1 or substantially the center. In addition to the maximum, these intervals gradually decrease from the center in the longitudinal direction of the impact beam 1 or from substantially the center toward both ends of the impact beam 1, and the interval gradually decreases in this direction. It continues from the both ends of this to the location which is a fixed distance toward the center or substantially the center.

  Further, the width dimension of the valley portion 5, which is a portion where the two upright portions 6 are connected to each other, also changes in the length direction of the impact beam 1 in the same manner as the width dimension of the impact beam 1. The depth of 5 is also the maximum at the center in the length direction of the impact beam 1 or substantially at the center, and this depth gradually decreases from the center in the length direction of the impact beam 1 to the both ends of the impact beam 1. In this way, the depth gradually decreases from both ends in the length direction to a place at a constant distance toward the center or substantially the center.

  As described above, since the impact beam 1 is arranged on the door with the longitudinal direction of the vehicle as the longitudinal direction, the two standing portions 6 in the width direction of the impact beam 1 act at right angles or at angles to the door. When the side collision load acts on the door at a right angle, each of the standing portions 6 has the impact beam 1. Although it has a central portion in the longitudinal direction or a curved portion of the substantially central portion, it has a length extending in a direction perpendicular to or substantially perpendicular to the acting direction A of the load.

  Each of the standing parts 6 extending over the entire length of the impact beam 1 has a thick part 6A having a thickness larger than that of the bottom part 3 from which the standing part 6 stands. It is provided in a part in the length direction of the upright portion including the center in the length direction or substantially the center. The range of the thick portion 6A is a range indicated by a two-dot chain line B in FIG. The thickness of the thick portion 6A is larger than the thickness of the flange portion 4 and the trough portion 5, and the thickness of the flange portion 4 and the trough portion 5 is equal to that of each part of the impact beam 1 excluding the thick portion 6A. Same as thickness. In other words, the thickness of the bottom part 3, the thickness of the flange part 4, the thickness of the valley part 5, and the thickness of each part of the upright part 6 that is not the thick part 6A are the same, and the thick part 6A. And the thickness of the bottom part 3, the flange part 4 and the valley part 5 at the same location in the length direction of the impact beam 1 are thicker than the thick part 6A.

  Each work process for forming the impact beam 1 provided with the thick part 6A from the plate member 20 shown in FIG. 6 is performed in the order of FIG. 7, FIG. 9, FIG. 10, and FIG. FIG. 9 shows a press die set used in the work process of FIG.

  First, as shown in FIG. 7, the plate material 20 is press-molded by the upper mold 30 and the lower mold 31 mounted on the press device. The plate material 20 has the same thickness as each portion of the impact beam 1 except the thick portion 6A or a thickness slightly larger than this, and press molding maintains the thickness of the plate material 20 or slightly reduces it. Done. By this press molding, the plate member 20 is generally formed in a shape having a portion similar to the raised portion 2, and the portion that should become the thick portion 6A is curved and protrudes outward in the thickness direction of the thick portion 6A. The curved portion 21 is used. Therefore, the work process shown in FIG. 7 is a bending part forming process for forming the bending part 21 on the plate 20.

  Next, the plate member 20 is pressed using a press die set 40 shown in FIG. This press die set 40 is arranged on the upper die 41, the lower die 42, and the lower die 42 side that move up and down, and blank holders 43 and 44 that are elastically urged upward by elastic members 43A and 44A such as springs. And. Moreover, the part corresponding to the curved part 21 in the upper mold | type 41 and the lower mold | type 42 is linear or substantially linear shaping | molding part 41A, 42A. The capacity of the gap formed between the molding parts 41A and 42A when the upper mold 41 and the lower mold 42 are matched is set to be the same as the volume of the bending part 21.

  FIG. 9 shows a state where the upper die 41 is lowered and the plate material 20 is pressed by the upper die 41 and the lower die 42. In the middle of lowering of the upper die 41, the blank holder 43 and the upper die 41 shown in FIG. 8 sandwich the portion 22 to be the valley 5 in the plate member 20, and the blank holder 44 and the upper die 41 sandwich the plate member. The part 23 which becomes the bottom part 3 and the flange part 4 in 20 is clamped. As shown in FIG. 9, the blank holders 43 and 44 serve as clamping members that sandwich the predetermined portions 22 and 23 of the plate member 20 together with the upper mold 41 and immobilize these portions 22 and 23. The curved portion 21 of the plate member 20 is formed by the forming portions 41A and 42A.

  By this molding, the molding portion 41A of the upper mold 41 presses the curved projection side surface of the bending portion 21 toward the molding portion 42A side of the lower mold 42, and the bending portion 21 is linearly formed by these molding portions 41A and 42A. Alternatively, it is deformed into a portion 24 having a substantially linear shape. Due to this deformation, the portion 24 is compressed by an amount shorter than that of the curved portion 21, so that the compressed portion 24 is thicker than the original thickness of the plate member 20 and becomes thicker. It becomes a thick part.

  For this reason, the work process shown in FIG. 9 is a thickening process for obtaining the thick portion 24 by thickening.

  Thereafter, the work process of FIG. 10 is performed. In this work process, a press die set 50 including an upper die 51, a lower die 52, and blank holders 53 and 54 is used. The molding part 51A of the upper side 51 and the molding part 52A of the lower mold 52 are curved, and the vertical dimension of these molding parts 51A, 52A is smaller than the vertical dimension of the thick part 24. Due to the lowering of the upper die 51, the portion 22 to be the valley portion 5 in the plate material 20 is sandwiched between the upper die 51 and the blank holder 53, and the portion 23 to be the bottom portion 3 and the flange portion 4 is the upper die 51 and blank. After being sandwiched between the holders 54, the plate 20 is pressed to the lower mold 52 side by the upper mold 51, whereby the dimension in the standing direction of the thick wall portion 24, which should be the standing section 6, is reduced. Become. This dimension shortening operation is performed by changing the thick portion 24 to the thick portion while maintaining the thickness of the thick portion 24 to be the same or substantially the same by the forming portion 51A of the upper side 51 and the forming portion 52A of the lower mold 52. 24 is performed by deforming into a curved portion 25 that protrudes curved outward in the thickness direction.

  For this reason, the work process of FIG. 10 is a bending process for obtaining the bending part 25.

  Next, the work process of FIG. 11 is performed. In this work process, a press die set 60 including an upper die 61, a lower die 62, and blank holders 63 and 64 is used. The molding part 61A of the upper die 61 and the molding part 62A of the lower die 62 have a linear or substantially linear shape. Due to the lowering of the upper die 61, the portion 22 to be the valley portion 5 in the plate material 20 is sandwiched between the upper die 61 and the blank holder 63, and the portion 23 to be the bottom portion 3 and the flange portion 4 is the upper die 61 and blank. After being sandwiched between the holders 64, the bending portion 25 is formed into a straight or substantially straight shape by the forming portion 61A of the upper mold 61 and the forming portion 62A of the lower mold 62.

  That is, also in this work process, the curved portion 25 has the curved projection side surface pressed by the molded portion 61A of the upper mold 61 toward the molded portion 62A of the lower mold 62, and as a result, the curved portion 25 is linear or substantially straight. The portion 26 is deformed into a linear shape portion 26, and by this deformation, the portion 26 is compressed by an amount shorter than the curved portion 25. By this compression, the portion 26 becomes a thickened portion further increased in thickness.

  For this reason, the work process shown in FIG. 11 is the second thickening process for obtaining the thickened part 26 having a further increased thickness.

  Thereafter, for the plate member 20 formed as described above, the portion 23 is made to be the bottom portion 3 by press forming for reducing the distance between the end portions on the portion 23 side of the two thick portions 26 or by bending the portion 23. The impact beam 1 shown in FIG. 2 is manufactured from the plate material 20 by performing required operations such as press forming to form the flange portion 4 and further trimming the entire plate material 20. The impact beam 1 is subjected to quenching treatment by high-temperature heating and rapid cooling by high-frequency induction current or the like with respect to all or a part of which hardness is required.

  As described above, the operation of manufacturing the impact beam 1 from the plate material 20 by press molding may be performed by a press device prepared for each press molding operation, or may be performed as a series of operations by a transfer press device. .

  FIG. 12 is a graph when the both ends in the length direction of the impact beam are supported and a load is applied to the center portion in the length direction of the impact beam to cause a deflection amount in the center portion. Is the magnitude of the load, and the horizontal axis is the magnitude of the deflection. In this graph obtained by simulation, a solid line C and a broken line D indicate two impact beams formed by the same material in the same size and shape except for the thickness. The solid line C is a case of an impact beam in which a part of the upright part 6 is a thick part 6A as shown in FIGS. 2 to 5 and the total weight is 1365.15 grams, and the broken line D is This is the case for an impact beam with the same overall thickness and a total weight of 1429.30 grams. The impact beam of the solid line C is 4.5% lighter than the impact beam of the broken line D.

  The thickness of the thick portion 6A of the impact beam indicated by the solid line C is 1.65 mm, and the thickness of the other portions is 1.5 mm. The thickness of the impact beam indicated by the broken line D is 1.6 mm.

  As can be seen from the graph of FIG. 12, the maximum load that can be supported by both impact beams is almost the same, but the amount of deflection until reaching this maximum load is greater for the impact beam of the solid line C than for the impact beam of the broken line D. Is also big. This means that when the impact beam is bent and deformed by the load, the amount of bending until the standing portion 6 is greatly deformed due to the increase of the load and becomes the buckled state shown in FIG. This means that the impact beam of the solid line C can be made larger than the beam. The reason why the deflection amount of the impact beam of the solid line C at the maximum load is large is that the thickness of the standing part of the impact beam of the solid line C is larger than the thickness of the standing part of the impact beam of the broken line D. Because.

  In the graph of FIG. 12, the area surrounded by the solid line C and the horizontal axis represents the amount of energy absorbed by the impact beam by the deflection of the solid line C, and the broken line D and the horizontal axis The area surrounded by, represents the amount of energy absorbed by the impact beam as the impact beam indicated by the broken line D bends. The impact beam indicated by the solid line C has a larger amount of energy absorption than the impact beam indicated by the broken line D.

  As described above, in the impact beam 1 of the present embodiment, the thick portion 6A is provided in the upright portion 6 that contributes to the amount of energy absorption. Until the amount of bending increases, the upright portion 6 is not greatly deformed to be in a buckled state. For this reason, when compared with the impact beam in which the overall weight is 4.5% heavier than the impact beam 1 of the present embodiment and the standing part and the other part have the same thickness, the energy absorption amount Can be increased.

  Therefore, according to the present embodiment, while reducing the weight of the impact beam 1, a large energy absorption amount at the time of a side collision can be secured, and the energy absorption amount with respect to the entire weight of the impact beam can be increased.

  Moreover, since the thick part 6A is provided only in the central part or the substantially central part which is a part of the length direction of the impact beam 1, the impact beam 1 can also be reduced in weight in this respect. Further, the central portion or the substantially central portion is a large portion that tends to buckle the upright portion 6 by the side collision load received by the impact beam 1 attached to the inner panel 10 of the door by the bracket members 11 and 12 shown in FIG. Since the compressive stress is generated by the bending moment, the energy absorption amount can be effectively increased while reducing the weight of the impact beam 1.

  Further, according to this embodiment, the number of the thick portions 6A is two apart in the thickness direction of the thick portions 6A, so that the energy absorption amount is also increased in this respect.

  Further, the two thick portions 6A are connected to each other at the end portion in the standing direction of the thick portion 6A by the valley portion 5, and the length direction of the impact beam 1 in which these thick portions 6A are provided. In other words, the width dimension W1 shown in FIG. 3 is larger than the width dimension of other portions in the length direction of the impact beam 1. Therefore, the section modulus at the portion where the bending moment when the impact beam 1 receives a load is maximized can be increased. Thereby, the maximum load when the impact beam 1 bends to the amount of bend by which the standing part 6 buckles can be increased.

  9 and 11, the curved portions 21, 25 are added to the thick portions 24, 26 by pressurizing the curved projection side surfaces of the curved portions 21, 25 to the opposite side of the curved projection side. The pressure members are the upper dies 41 and 61 that are press dies for applying a pressing force to the curved portions 21 and 25, but FIGS. 14 and 15 show an embodiment in which the pressure member is a separate member. Show.

  The pressurizing member in FIG. 14 is a liquid 71 such as water or oil enclosed in the bag 70. The slide cam 73 slides and pressurizes the liquid 71 by the drive cam 72 that moves downward by a drive means such as a cylinder, and the liquid pressure of the liquid 71 acts on the curved portions 21 and 25 via the bag 70. As a result, the curved portions 21 and 25 are pressed against the molding portion 74A that is linearly or substantially linearly formed on the die 74 to form the thick portions 24 and 26. The liquid 71 at this time freely follows and deforms as the curved portions 21 and 25 are deformed into the linear or substantially linear thick portions 24 and 26.

The pressure member shown in FIG. 15 is an elastically deformable elastic member 75 formed of silicon rubber or the like. When the drive cam 72 moves downward, the elastic member 75 is pressurized by the slide cam 73 that slides, and the bending portions 21 and 25 are pressed against the molding portion 74A of the die 74 by the elastic force of the elastic member 75, so that the bending is achieved. The parts 21 and 25 become the thick parts 24 and 26. At this time, the elastic member 75 undergoes elastic deformation following copying.
In these embodiments, the liquid 71 and the elastic member 75 are provided with clamping portions for clamping the above-described portions 22 and 23 of the plate member 20 together with the mold 74. Such a sandwiched portion may be a member such as a mold.

  The vehicle load receiving article in the above embodiment is the impact beam of the door, but the vehicle load receiving article shown in the embodiment of FIG. The front bumper beam 81 includes a pair of left and right front side frames disposed in a vehicle interior space in front of a driver's seat such as an engine room in an FF (front engine, front drive) or FR (front engine, rear drive) four-wheel vehicle. The tips of 82 are joined. The front bumper beam 81 that receives a collision load from the front direction A is a channel shape including a web portion 81A having a vertical direction as a width direction and upper and lower flange portions 81B and 81C extending rearward from the upper and lower ends of the web 81A. It has become. The flange portions 81B and 81C are parallel or substantially parallel to the load acting direction A, and have a length extending in the left-right direction with a component perpendicular to the A direction, like the web portion 81A. .

  The flange portions 81B and 81C, which are standing portions that stand up rearward from the web portion 81A, are thick-walled portions that are thicker than the web portion 81A. For this reason, as with the impact beam 1 of the above-described embodiment, the front bumper beam 81 has an increased amount of energy absorption of the collision load while being reduced in weight.

  In this embodiment, the entire length in the length direction of the flange portions 81B and 81C may be a thick portion, and between the joint portions with the two front side frames 82, in other words, the joint portions with the two vehicle bodies. Only the central part or the substantially central part between them may be the thick part.

  FIG. 17 shows another embodiment for providing a thick portion 90A in a part of a plate 90 which is a material of a vehicle load receiving article. In this embodiment, the auxiliary plate material 91 is joined to a part of the plate material 90 to be the thick portion 90A by spot welding or laser welding. Thereby, a part of the plate member 90 is thickened, and after this thickening operation step, the plate member 90 including the auxiliary plate member 91 is press-molded to form a vehicle having a predetermined shape in which a thick part is provided. Manufacture load bearing articles.

  FIGS. 18-20 shows embodiment which provides a thick part in the width direction part of the board | plate material which is a material of the load receiving article for vehicles by a roll forming process. The roll forming process is performed using a roll forming apparatus 101 shown in FIG. 18, which includes an uncoiler 102 that feeds out a coil material 100 that is a plate material of a load receiving article for a vehicle, and a delivery of the coil material 100. And a plurality of forming roller devices 103 arranged in the direction. Each forming roller device 103 includes a pair of rollers 104 and 105 that pressurize the coil material 100 from above and below.

  19 is a cross-sectional view taken along the line S19-S19 in FIG. 18 showing a cross section of the coil material 100 before being formed by the forming roller device 103, and FIG. 20 is a view showing the coil material after being formed by each forming roller device 103. FIG. 19 is a cross-sectional view taken along line S20-S20 in FIG. As shown in FIG. 20, an increased thickness portion 100 </ b> A is formed in a part in the width direction of the coil material 100 after roll forming.

  By cutting the coil material 100 into a predetermined length dimension, a plate material having a predetermined length to be a load receiving article for a vehicle is produced. By pressing the plate material into a predetermined shape, a part of the thick wall portion is produced. The vehicle load receiving article is manufactured.

  This embodiment is suitable for manufacturing a vehicle load receiving article in which a thick portion provided in a part in the width direction is continuous over the entire length in the length direction. In addition, since a plate material having a predetermined length as a material of a load receiving article for a vehicle can be produced in a large number by cutting the coil material 100 formed by roll forming into a predetermined length, this plate material can be efficiently produced. it can.

  The vehicle load receiving article of each embodiment described above has an open shape in which the shape of the cross section orthogonal to the length direction is open because one end and the other end are not connected. However, the vehicle load receiving article 111 shown in FIG. 21 has a cross-sectional shape orthogonal to the length direction and is closed because one end and the other end are connected. It is a closed shape. Specifically, the vehicle load receiving article 111 includes two sides 112 and 113 that are parallel or substantially parallel to the load acting direction A, and two sides that are perpendicular or substantially perpendicular to the A direction. 114 and 115, the shape of the cross section orthogonal to the length direction is a quadrangle, and one end 111A and the other end 111B are welded by the welded portion 116.

  Of the four sides 112 to 115, the sides 112 and 113 that are standing portions that stand up from the sides 114 and 115 are thick portions having a large thickness. For this reason, the amount of energy absorption when the vehicle load receiving article 111 is bent by receiving a load in the A direction is increased, and this increase in the amount of energy absorption reduces the thickness of the sides 114 and 115 to the side 112. , 113 is realized with a thickness smaller than the thickness of the load receiving article 111 for the vehicle.

  The thickness of the sides 112 and 113 may be made larger than the thickness of the sides 114 and 115 only for a part of the vehicle load receiving article 111 in the length direction. You may go over.

  The embodiment of FIG. 21 can be applied to various vehicle load receiving articles including a door impact beam, a front bumper beam, and a rear bumper beam.

  The present invention can be used for, for example, a load receiving article for a vehicle such as a door impact beam or a bumper beam.

FIG. 1 is a side view showing a state in which an impact beam of a door serving as a vehicle load receiving article according to an embodiment of the present invention is attached to an inner panel forming a door with a bracket member. FIG. 2 is an overall perspective view of the impact beam excluding the bracket member shown in FIG. 3 is a cross-sectional view taken along line S3-S3 of FIG. 4 is a cross-sectional view taken along line S4-S4 of FIG. 5 is a cross-sectional view taken along line S5-S5 of FIG. FIG. 6 is a cross-sectional view of a plate material that is a material of an impact beam. FIG. 7 is a cross-sectional view showing a first step in the operation for forming the thick portion in the plate material of FIG. FIG. 8 is a cross-sectional view showing a press die set used in an operation for forming a thick portion on the plate material of FIG. FIG. 9 is a cross-sectional view showing a second step of using the press die set of FIG. 8 among the operations for forming the thick portion on the plate material of FIG. FIG. 10 is a cross-sectional view showing a third step in the operation for forming the thick portion in the plate material of FIG. FIG. 11 is a cross-sectional view showing a fourth step in the operation for forming the thick portion in the plate material of FIG. FIG. 12 shows the relationship between the load and the amount of deflection of the impact beam when a load is applied to the impact beam having a thick part in the standing part and the impact beam having the same thickness as the whole. It is a graph to show. FIG. 13 is a cross-sectional view showing that the standing portion is greatly deformed to be in a buckled state when the impact beam receiving the load is bent and deformed. FIG. 14 is a cross-sectional view showing an embodiment in which the pressurizing member that pressurizes the curved portion is a liquid. FIG. 15 is a cross-sectional view showing an embodiment in which a pressure member that pressurizes the bending portion is an elastic member. FIG. 16 is a perspective view showing a front bumper beam that is a load receiving article for a vehicle. FIG. 17: is sectional drawing which shows embodiment which joins another board | plate material to a board | plate material, and provides a thick part. FIG. 18 is a side view showing a roll forming apparatus for forming a thick portion by roll forming at a part in the width direction of a plate material that is a material of a vehicle load receiving article. 19 is a cross-sectional view taken along line S19-S19 in FIG. 20 is a cross-sectional view taken along line S20S-20 in FIG. FIG. 21 is a cross-sectional view showing an embodiment of a vehicle load receiving article in which the cross-sectional shape orthogonal to the length direction is a closed shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact beam of door which is load receiving article for vehicle 3 Bottom part which is other part 6 Standing part 6A Thick part 10 Inner panel of door 20, 90, 100 Plate material 21, 25 which is material of load receiving article for vehicle Part 24, 26 Thick part 41, 61 Upper die 43, 44, 63, 64 as a pressure member Blank holder 71 as a sandwich member 71 Liquid as a pressure member 75 Elastic member as a pressure member 100 Coil material 101 Roll forming apparatus 111 Vehicle load receiving article A Load direction

Claims (5)

It has an elongated shape,
A raised portion is formed in the center in the width direction or substantially in the center, and both sides in the width direction of this raised portion are bottoms, and the ends on the outer sides in the width direction of these bottoms rise to the same side as the raised portions. It is a flange part, and at the center in the width direction or substantially at the center of the raised part is provided a trough that is recessed to the opposite side of the raised direction of the raised part,
The raised portion, the bottom portion, the flange portion, and the trough portion are continuously formed from one end to the other end in the length direction,
The load receiving article for a vehicle, wherein the upright portions on both sides in the width direction of the raised portion are parallel or substantially parallel to the acting direction of the load.   The load receiving article for a vehicle according to claim 1, wherein the width dimension is largest at the center in the length direction or substantially at the center, and the width dimension from the center or approximately the center toward both ends in the length direction. The load receiving article for a vehicle is characterized in that the minimum width dimension continues from the center in the length direction or a position away from the approximate center to both ends in the length direction.   The load receiving article for a vehicle according to claim 1 or 2, wherein there are two spaces between the bottom portions on both sides in the width direction, two spaces between the flange portions on both sides in the width direction, and two pieces in the width direction. The interval between the upright portions is maximum at the center in the length direction or substantially at the center, and these intervals are directed toward both ends in the length direction from the center in the length direction or approximately at the center. The distance is gradually decreased, and the interval gradually decreases in this way from the both ends in the length direction to the center in the length direction or a position at a constant distance toward the substantially center. A vehicle load receiving article.   The load receiving article for a vehicle according to any one of claims 1 to 3, wherein the depth of the trough is maximum at the center or substantially the center in the length direction, and the depth is the length direction. From the center or substantially the center to the both ends in the length direction, the depth of the valley portion gradually decreases in this way, from the both ends in the length direction to the center in the length direction or A load receiving article for a vehicle, characterized in that the article continues to a position at a constant distance toward the center.   5. The vehicle load receiving article according to claim 1, wherein at least a part of the upright part in the length direction is more than the other part at the same position in the length direction as the at least part. A load receiving article for a vehicle, characterized in that it is a thick part having a large thickness. Vehicle load receiving article.

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