JP5459029B2 - Pillar structure for vehicle and method for manufacturing vehicle pillar - Google Patents

Description

  The present invention relates to a vehicle pillar structure and a vehicle pillar manufacturing method.

  Conventionally, as a center pillar structure that increases the proof strength against a side collision load of a vehicle, for example, as shown in JP-A-2004-314845, a reinforcing member is disposed in an internal space between a center pillar outer and a center pillar inner, There is known a center pillar structure in which an extending portion extending in the vehicle inside / outside direction is provided at a midway portion of the reinforcing member in the vehicle front-rear direction, and quenching is performed in an end region outside the vehicle of the extending portion.

JP 2004-314845 A

  However, in such a structure, since it was necessary to perform quenching after forming the reinforcing member by pressing or the like, there was a problem that the number of work steps was increased. Moreover, since it hardens | cures after shaping | molding once, there existed a possibility that distortion might arise by quenching. As a method for solving such a problem, it is conceivable to simultaneously perform molding and cooling by a hot stamp that presses a heated member with a cooled die. However, with hot stamping, the strength of the entire cross section formed by hot stamping is increased, so that there is a problem that the mold is easily damaged when trimming unnecessary portions generated by pressing, resulting in high production costs. It was.

  The present invention has been made to solve such a problem, and provides a vehicle pillar structure and a vehicle pillar manufacturing method capable of improving productivity while increasing pillar strength. Objective.

That is, the pillar structure according to the present invention includes a reinforcing portion formed by pressing a heated member with a cooled die, and a portion other than the reinforcing portion including at least an outer peripheral edge of the heated member. A low-strength part formed by pressing with a mold having a temperature higher than that of the cooled mold, and a step part formed by bending both corners of the pillar-shaped member having a convex cross-sectional shape inside the vehicle , The reinforcing portion and the low-strength portion are formed on the pillar component member, and a boundary between the reinforcing portion and the low-strength portion is located on a surface that intersects the convex direction of the pillar among the surfaces that form the step portion. Configured to do .

  According to the present invention, by providing a reinforcing part formed by pressing a heated member with a cooled die, the reinforcing part is quenched at the same time as molding, and the reinforcing part has high strength. It becomes. In addition, the low strength portion includes the low strength portion formed by pressing a portion other than the reinforcement portion including at least the outer peripheral edge of the heated member with a die having a higher temperature than the cooled die. Will have a lower strength. Therefore, unnecessary portions can be easily trimmed, and productivity can be improved while increasing the strength of the pillars.

In addition, because the boundary between the reinforcing part and the low-strength part is located on the surface that forms the step part that intersects the convex direction of the pillar, it is possible to divide the cooled mold and the mold that has a higher temperature than the cooled mold. It is possible to provide the surface on a surface intersecting the convex direction of the pillar, and it is not necessary to provide an acute angle and thin portion in the mold. Therefore, the mold configuration can be facilitated, and the production cost can be suppressed.

In the vehicle pillar manufacturing method according to the present invention, the pillar component member is formed in a convex cross-sectional shape, and the step portion is formed by bending both corners of the convex cross-sectional shape of the pillar component member toward the vehicle inner side. In the manufacturing method of the above, by pressing the heated member using the cooled strong cooling die and the weak cooling die having a temperature higher than that of the strong cooling die, the portion to be pressed into the strong cooling die is A low-strength portion is formed in a portion other than the reinforcing portion including at least an outer peripheral edge of the heated member and pressed into the weakly cooled mold, and the heated member is formed. In the method of manufacturing a pillar for a vehicle, when pressing, the boundary between the reinforcing portion and the low-strength portion is pressed so as to be positioned on a surface intersecting a convex direction of the pillar among the surfaces forming the step portion .

  According to the present invention, by forming the reinforcing portion in the portion to be pressed into the strong cooling mold, the reinforcing portion is quenched at the same time as molding, and the reinforcing portion has high strength. In addition, by forming a low strength portion in a portion other than the reinforcing portion including at least the outer peripheral edge of the heated member and pressed into the weakly cooled mold, the low strength portion has a lower strength than the reinforcing portion. Will have. Therefore, unnecessary portions can be easily trimmed, and productivity can be improved while increasing the strength of the pillars.

In addition, because the boundary between the reinforcing part and the low-strength part is located on the surface that forms the step part that intersects the convex direction of the pillar, it is possible to divide the cooled mold and the mold that has a higher temperature than the cooled mold. It is possible to provide the surface on a surface intersecting the convex direction of the pillar, and it is not necessary to provide an acute angle and thin portion in the mold. Therefore, the mold configuration can be facilitated, and the production cost can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the pillar structure for vehicles which can aim at the improvement of productivity, raising the intensity | strength of a pillar, and the pillar manufacturing method for vehicles can be provided.

It is the perspective view which showed the pillar structure which concerns on embodiment of this invention. It is arrow sectional drawing which showed the AA cross section of the pillar structure shown in FIG. It is arrow sectional drawing which showed the BB cross section of the pillar structure shown in FIG. It is a figure which shows the outline of the press apparatus used for the manufacturing method of the pillar structure shown in FIG.

  Hereinafter, preferred embodiments of the pillar structure according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, in this specification, the forward direction when the vehicle is moving forward is defined as “front”, and terms such as “front” and “rear” are used.

  FIG. 1 is a perspective view showing a pillar structure according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of the pillar structure shown in FIG. 3 is a cross-sectional view taken along the arrow B-B of the pillar structure shown in FIG.

  As shown in FIG. 1, the pillar structure 1 according to this embodiment is applied to a center pillar outer rain reinforcement 2.

  The center pillar outer rain reinforcement 2 is a member that constitutes a center pillar that is disposed in the center in the vehicle front-rear direction and is provided in the vehicle vertical direction. The center pillar outer rain reinforcement 2 functions as a reinforcing member that absorbs collision energy when the center pillar receives a load due to a side collision or the like. The center pillar outer rain reinforcement 2 is disposed in a space formed between an outer panel (not shown) and an inner panel (not shown), and is provided in the vertical direction of the vehicle.

  The center pillar outer rain reinforcement 2 is formed with a step portion 3. The step part 3 is formed from the vicinity of the central part in the vertical direction of the vehicle to the upper part. As shown in FIG. 2, the step portion 3 is formed at two locations by bending both corners of the center pillar outer rain reinforcement 2 having a convex cross-sectional shape toward the inside of the vehicle. A boundary 6 between the reinforcing portion 4 and the low-strength portion 5 is located on a surface 10 that intersects the convex direction of the center pillar outer reinforcement 2 among the surfaces that form the step portion 3.

  The center pillar outer rain reinforcement 2 is formed with a reinforcing portion 4. The reinforcing portion 4 functions as a reinforcing portion that absorbs collision energy when the center pillar receives a load due to a side collision or the like. The reinforcing part 4 is formed from the lower part of the center pillar outer rain reinforcement 2 to the upper end part. As shown in FIG. 2, the reinforcing portion 4 is formed in a region outside the vehicle from the boundary 6 positioned on the surface 10 in the cross-sectional portion having the step portion 3. Further, the reinforcing portion 4 is formed in a region outside the vehicle from the boundary 6 positioned at both corners of the convex cross-sectional shape, as shown in FIG. The reinforcing part 4 is formed by pressing a heated member with a cooled die. That is, the reinforcing portion 4 is formed by a pressing method in which molding and quenching are performed simultaneously. Therefore, the reinforcing portion 4 has high strength without performing quenching separately from the molding. As such a pressing method, for example, a hot stamp is used.

  A low strength portion 5 is formed in a region other than the reinforcing portion 4 in the center pillar outer rain reinforcement 2. The low strength portion 5 is a portion including the outer peripheral edge 9 of the center pillar outer rain reinforcement 2 that requires trimming after pressing. The low-strength portion 5 is formed by pressing the heated member with a die having a higher temperature than the die used for forming the reinforcing portion 4. That is, the low-strength portion 5 has a lower strength than the reinforcing portion 4. In addition, it is preferable that the low-strength part 5 is not quenched by using a heated mold for forming the low-strength part 5.

  Next, the operation and effect of the pillar structure 1 according to the present embodiment will be described.

  According to the pillar structure 1 according to the present embodiment, the reinforcing portion 4 having high strength is formed by quenching in a portion where high strength is required for absorbing collision energy, that is, a region outside the vehicle. Therefore, the strength can be increased.

  Here, the boundary 6 between the reinforcing portion 4 and the low strength portion 5 is a portion where the material strength changes and the strength is low. Therefore, when an impact is applied to the center pillar outer rain reinforcement 2, the boundary 6 is the starting point of deformation. It is easy to become. Therefore, it is preferable that a measure is taken so that the change in strength at the boundary 6 does not affect the strength of the entire pillar in a portion where the cross section is thin and the strength tends to be relatively weak. In the present embodiment, in a portion having a narrow cross section, that is, a portion where the step portion 3 is provided, the boundary 6 is located on the narrow surface 10 surrounded by the ridge line 7 and the ridge line 8. With such a configuration, even when an impact is applied to the center pillar outer rain reinforcement 2 and deformation occurs at the boundary 6, local buckling is suppressed by the ridge line 7 and the ridge line 8. Therefore, the influence which the intensity change in the boundary 6 has on the intensity of the entire pillar can be reduced. Therefore, the strength can be further increased.

  Moreover, in the cross-sectional part which has the step part 3, the boundary 6 of the reinforcement part 4 and the low intensity | strength part 5 is located in the surface 10 which cross | intersects the convex direction of the center pillar outer rain reinforcement 2 among the surfaces which form the step part 3. doing. Therefore, it is possible to divide the cooled mold for forming the reinforcing portion 4 and the mold for forming the low strength portion 5 having a higher temperature than the cooled mold at a position corresponding to the surface 10. There is no need to provide the mold with an acute angle and thin portion. Therefore, the mold configuration can be facilitated, and the production cost can be suppressed.

  Moreover, since the reinforcement part 4 is formed by the press method in which shaping | molding and hardening are performed simultaneously, there are few residual distortions after shaping | molding. Therefore, the pillar structure 1 according to the present embodiment also has an advantage that deformation does not occur due to a springback or the like after molding.

  Furthermore, the region including the outer peripheral edge 9 that requires trimming after pressing is formed as a low-strength portion 5 having lower strength than the reinforcing portion 4. This facilitates trimming of unnecessary portions caused by pressing, and reduces damage to the mold. Therefore, productivity can be improved. If the low-strength portion 5 is not quenched, trimming can be performed more easily, and the productivity can be further improved.

  Next, a method for manufacturing the pillar structure 1 according to this embodiment will be described.

  FIG. 4 is a diagram showing an outline of a press apparatus used in the method for manufacturing the pillar structure shown in FIG.

  The press device 60 is a device for manufacturing the pillar structure 1 according to the present embodiment. The press device 60 includes an upper mold 70 and a lower mold 80.

  The upper mold 70 includes a cooled mold (hereinafter referred to as a strong cooling mold) 71 for forming the reinforcing portion 4 and a mold (hereinafter referred to as a high cooling mold 71 for forming the low strength portion 5). , 72). In the portion for forming the cross section having the step portion 3, the dividing surface 75 of the strong cooling die 71 and the weak cooling die 72 intersects the transfer surface 76 corresponding to the surface 10 of the center pillar outer rain reinforcement 2. Is provided. If the dividing surface 75 is provided so as to intersect with another transfer surface (for example, the transfer surface 77), the dividing surface 75 and the transfer surface intersect at an acute angle, and a thin portion is provided in the mold. There is a need. Therefore, the configuration of the mold becomes difficult. However, with the configuration as in the present embodiment, the dividing surface 75 and the transfer surface 76 do not intersect at an acute angle, and it is not necessary to provide a thin portion in the mold. Accordingly, the mold configuration is facilitated, and the production cost can be reduced. In a portion for forming a cross section that does not have the step portion 3, the dividing surfaces (not shown) of the strong cooling mold 71 and the weak cooling mold 72 are provided at positions corresponding to both corners of the convex cross section of the pillar. Yes. The upper die 70 is provided with an elevating function so that the heated member 100 can be pressed.

  The lower mold 80 includes a cooled mold (hereinafter referred to as a strong cooling mold) 81 for forming the reinforcing portion 4 and a mold (hereinafter referred to as a strong cooling mold 81 for forming the low strength portion 5). , 82). In the portion for forming the cross section having the step portion 3, the dividing surface 85 of the strong cooling mold 81 and the weak cooling mold 82 intersects the transfer surface 86 corresponding to the surface 10 of the center pillar outer rain reinforcement 2. Is provided. Similar to the above-described upper mold 70, with such a configuration, the dividing surface 85 and the transfer surface 86 do not intersect at an acute angle, and it is not necessary to provide a thin portion in the mold. Accordingly, the mold configuration is facilitated, and the production cost can be reduced. In a portion for forming a cross section that does not have the step portion 3, the dividing surfaces (not shown) of the strong cooling mold 81 and the weak cooling mold 82 are provided at positions corresponding to both corners of the convex cross section of the pillar. . The heated member 100 is set on the lower mold 80.

  The strong cooling mold 71 and the strong cooling mold 81 are each provided with a cooling means. As the cooling means, any means capable of cooling may be used. For example, a flow channel 73 is provided in the strong cooling mold 71, a water flow path 83 is provided in the strong cooling mold 81, and a chiller (not shown) is used. A means for cooling the strong cooling mold 71 and the strong cooling mold 81 by circulating water through the flowing water path 73 and the flowing water path 83 is used.

  The weak cooling mold 72 is provided with heating means for raising the mold temperature higher than that of the strong cooling mold 71, and the weak cooling mold 82 is provided with heating means for raising the mold temperature higher than that of the strong cooling mold 81. Is provided. As the heating means, any means capable of heating may be used. For example, a heater insertion hole is provided in each of the weak cooling mold 72 and the weak cooling mold 82, and a heater 74 is inserted in the weak cooling mold 72 to weaken it. A means for inserting a heater 84 into the cooling mold 82 and heating the weak cooling mold 72 and the weak cooling mold 82 using the heater 74 and the heater 84 is used.

  As a method for manufacturing the pillar structure 1 according to the present embodiment, first, the member 100 for forming the center pillar outer rain reinforcement 2 is heated by a heating device (not shown). As the member 100, for example, a steel plate is used. As the heating device, for example, a high frequency induction heating device is used. The heating needs to be performed until reaching a temperature at which the member 100 can be hardened, and this temperature depends on the material of the member (such as carbon content).

  Next, the heated member 100 is set in the lower mold 80 of the press device 60.

  Then, the upper die 70 is lowered, the heated member 100 is pressed, and the center pillar outer rain reinforcement 2 is formed. At this time, since the strong cooling mold 71 and the strong cooling mold 81 are cooled, the portion pressed by the strong cooling mold 71 and the strong cooling mold 81 is rapidly cooled. Therefore, the parts pressed by the strong cooling mold 71 and the strong cooling mold 81 are quenched. Since the weak cooling mold 72 and the weak cooling mold 82 are heated, the portion pressed by the weak cooling mold 72 and the weak cooling mold 82 is not rapidly cooled. Therefore, the parts pressed by the weak cooling mold 72 and the weak cooling mold 82 are not quenched.

  In the manufacturing method according to the present embodiment, the reinforcing portion 4 can be formed in a portion pressed by the strong cooling die 71 and the strong cooling die 81. Since the reinforcement part 4 is quenched as described above, the reinforcement part 4 can be given high strength. Therefore, the strength can be increased.

  Here, the boundary 6 between the reinforcing portion 4 and the low strength portion 5 is a portion where the material strength changes and the strength is low. Therefore, when an impact is applied to the center pillar outer rain reinforcement 2, the boundary 6 is the starting point of deformation. It is easy to become. Therefore, it is preferable that the portion where the cross section is thin and the strength tends to be relatively weak is manufactured so that the strength change at the boundary 6 does not affect the strength of the entire pillar. In the manufacturing method according to the present embodiment, the boundary 6 can be positioned on the narrow surface 10 surrounded by the ridge line 7 and the ridge line 8 in a portion having a narrow cross section, that is, a portion where the step portion 3 is provided. With such a configuration, even when an impact is applied to the center pillar outer rain reinforcement 2 and deformation occurs at the boundary 6, local buckling is suppressed by the ridge line 7 and the ridge line 8. Therefore, the influence which the intensity change in the boundary 6 has on the intensity of the entire pillar can be reduced. Therefore, it is possible to further increase the strength.

  In addition, since the manufacturing method according to the present embodiment can simultaneously mold and quench the reinforcing portion 4, the pillar manufactured by the manufacturing method has a small residual strain after molding. Therefore, the pillar manufactured by this manufacturing method has the merit that deformation does not occur due to a springback or the like after molding.

  Furthermore, the manufacturing method according to the present embodiment can form the low-strength portion 5 at a portion pressed by the weak cooling die 72 and the weak cooling die 82. The low-strength portion 5 is not quenched as described above. Therefore, it is possible to give the low-strength portion 5 strength lower than that of the reinforcing portion 5, and it is possible to easily perform trimming to remove unnecessary portions after completion of molding. Therefore, it is possible to reduce damage to the mold during trimming, and it is possible to improve productivity.

  As described above, according to the vehicle pillar structure and the vehicle pillar manufacturing method according to the present embodiment, it is possible to improve productivity while increasing the strength of the pillar.

  In addition, this embodiment mentioned above shows an example of the pillar structure which concerns on this invention, and the manufacturing method of a pillar. Therefore, the pillar structure and the pillar manufacturing method according to the present invention are not limited to the above, and the pillar structure and the pillar manufacturing method according to the embodiments so as not to change the gist described in each claim. May be modified or applied to others.

  For example, in the above embodiment, the center pillar outer rain reinforcement 2 is provided with the reinforcing portion and the low strength portion among the components of the pillar structure, but the reinforcing portion and the low strength portion are provided on the outer panel which is another component of the pillar structure. A strength portion may be provided. Further, for example, in the above embodiment, the member 100 is set in the press device 60 after being heated, but may be set in the press device 60 before being heated and then heated.

  DESCRIPTION OF SYMBOLS 1 ... Pillar structure, 2 ... Center pillar outer rain reinforcement, 3 ... Step, 4 ... Reinforcement part, 5 ... Low-strength part, 6 ... Border, 7 ... Edge line, 8 ... Edge line, 9 ... Outer periphery, 10 ... Surface, 60 ... Pressing device, 70 ... Upper mold, 71 ... Strong cooling type, 72 ... Low cooling type, 73 ... Flow channel, 74 ... Heater, 75 ... Split surface, 76 ... Transfer surface, 77 ... Transfer surface, 80 ... Lower die , 81: Strongly cooled type, 82 ... Weakly cooled type, 83 ... Flow channel, 84 ... Heater, 85 ... Dividing surface, 86 ... Transfer surface, 100 ... Member.

Claims (2)

A reinforcing part formed by pressing a heated member with a cooled mold;
A low-strength portion formed by pressing a portion other than the reinforcing portion including at least an outer peripheral edge of the heated member with a die having a higher temperature than the cooled die;
A step portion formed by bending both corners of the convex cross-section pillar component member toward the vehicle inside;
With
The reinforcing portion and the low strength portion are formed on the pillar component member,
The boundary between the reinforcing portion and the low-strength portion is located on a surface that intersects the convex direction of the pillar among the surfaces that form the step portion.
Pillar structure for vehicles. A method of manufacturing a pillar for a vehicle, wherein the pillar component member is formed in a convex cross-sectional shape and the step portion is formed by bending both corners of the convex cross-sectional shape of the pillar component member toward the vehicle inner side,
By pressing the heated member using the cooled strong cooling mold and the weak cooling mold having a temperature higher than that of the strong cooling mold, a reinforcing portion is formed in the portion pressed by the strong cooling mold and the Forming a low-strength portion in a portion other than the reinforcing portion including at least the outer peripheral edge of the heated member and being pressed into the weakly cooled mold;
When pressing the heated member, press so that the boundary between the reinforcing portion and the low-strength portion is located on a surface intersecting the convex direction of the pillar among the surfaces forming the step portion,
Vehicle pillar manufacturing method.

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