CN217496286U - Vehicle frame - Google Patents
Vehicle frame Download PDFInfo
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- CN217496286U CN217496286U CN202123262581.0U CN202123262581U CN217496286U CN 217496286 U CN217496286 U CN 217496286U CN 202123262581 U CN202123262581 U CN 202123262581U CN 217496286 U CN217496286 U CN 217496286U
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Abstract
The utility model provides a frame, the frame is through the stamping forming and form the stamping forming part in hat form cross-section, and it possesses: a top portion; a pair of convex corner portions provided at both end portions of the top portion and having a target top portion curvature radius; a pair of side wall portions bent and extended from the respective convex corner portions of the top portion; a pair of concave corner portions having a target flange curvature radius provided at each end portion on a side opposite to the top portion of the pair of side wall portions; and a pair of flange portions extending in the width direction from each of recessed corner portions on the opposite side of the pair of side wall portions to the top portion toward the outside of the vehicle body frame, wherein the pair of convex corner portions and the pair of recessed corner portions are curved in a ridge line shape. The buckling strength of the vehicle body frame can be ensured by forming the corner edge portion to have a target radius of curvature and imparting plastic strain to the vicinity of the corner edge portion.
Description
Technical Field
The utility model relates to a frame.
Background
As a conventional vehicle body frame, for example, a vehicle body frame manufactured by a method of forming a bead extending in a longitudinal direction over the entire width of a compression surface of the vehicle body frame in order to improve a withstand load is known (for example, refer to patent document 1 (japanese patent No. 6516716)).
Further, as a conventional vehicle body frame, for example, a vehicle body frame manufactured by a method of applying a prestrain corresponding to a plastic strain to the vehicle body frame when a reinforcing rib is press-formed on the vehicle body frame is known. In general, as a characteristic of a metal material such as a steel plate, work hardening (also referred to as strain hardening) is caused by imparting a prestrain, and thus a yield stress can be increased (for example, see patent document 2 (japanese patent laid-open No. 2020 and 146747)).
As a conventional vehicle body frame, a vehicle body frame manufactured by the following method is known: for example, the wavy form is stamped to a height giving a prestrain corresponding to half of the target plastic strain, and the wavy form after the stamping is stamped to be flat, thereby multiplying the prestrain of the vehicle frame. This makes it possible to easily apply plastic strain uniformly to the vehicle body frame, and to suppress a decrease in the plate thickness of the portion to which the plastic strain is applied, thereby achieving flattening (see, for example, patent document 3 (japanese patent application laid-open No. 2020-146748)).
SUMMERY OF THE UTILITY MODEL
The subject to be solved by the utility model
However, in the conventional vehicle body frame, for example, when the vehicle body frame has a hat-shaped cross section, if the bead is formed in the vicinity of the convex corner portion, it is difficult to uniformly apply a target plastic strain to the vicinity of the convex corner portion to form a curvature radius. Therefore, it is considered that the vehicle frame does not reach the target buckling strength. In this case, for example, there is a problem as follows: the material grade of the vehicle frame needs to be increased, and the cost is increased due to the increase of the unit price of the material.
An object of the present invention is to provide a vehicle frame in which a corner edge portion is formed to have a target radius of curvature and a plastic strain is imparted to the corner edge portion in the vicinity thereof, thereby ensuring buckling strength of the vehicle frame.
Means for solving the problems
In order to solve the above problems, the present invention provides the following solutions.
(1) The utility model discloses a frame of scheme, a serial communication port, the frame is through the stamping forming and form the stamping forming part in hat form cross-section, and it possesses: a top portion; a pair of convex corner portions provided at both end portions of the top portion and having a target top portion curvature radius; a pair of side wall portions bent and extended from the respective convex corner portions of the top portion; a pair of concave corner portions having a target flange curvature radius provided at each end portion on a side opposite to the top portion of the pair of side wall portions; and a pair of flange portions extending in the width direction from each of recessed corner portions on the opposite side of the pair of side wall portions to the top portion toward the outside of the vehicle body frame, wherein the pair of convex corner portions and the pair of recessed corner portions are curved in a ridge line shape.
(2) In the vehicle frame according to the aspect of (1), the roof portion has: a pair of outer roof portions formed at intervals in a width direction of the frame; and a reinforcing rib formed between a pair of the outer crests.
(3) In the vehicle body frame according to the aspect (1), the pair of side wall portions are each formed by a top side wall portion formed by a part of the side wall portion on the top side and a flange side wall portion formed by a part of the side wall portion on the flange side.
(4) In the vehicle body frame according to the aspect (3), the pair of lobe ribs are formed as convex portions so as to protrude outward of the vehicle body frame at an intersection of the outer roof portion and the roof side wall portion.
(5) In the vehicle body frame according to the aspect (3), the pair of recessed corner portions are formed as recessed portions so as to be recessed inward of the vehicle body frame at intersections of the flange side wall portions and the flange portions.
(6) In the vehicle frame according to any one of the aspects (1) to (5), the pair of convex corner portions and the pair of concave corner portions are formed in a bead shape extending in a longitudinal direction of the vehicle frame.
(7) In the vehicle frame according to any one of (1) to (5), a top side half is formed by the top portion, the pair of convex corner portions, and the pair of top side wall portions, a flange side half is formed by the pair of concave corner portions, the pair of flange portions, and the pair of flange side wall portions, and the vehicle frame is configured by the top side half and the flange side half.
(8) In the vehicle body frame according to any one of the aspects (1) to (5), the vehicle body frame is a front-rear frame provided in a vehicle body front-rear direction and having a bead formed in a longitudinal direction, or the vehicle body frame is a lateral frame provided in a vehicle width direction and having a bead formed in a longitudinal direction.
(9) In the vehicle body frame according to any one of the aspects (1) to (5), the vehicle body frame may be a front-rear frame that is provided in a vehicle body front-rear direction at a vehicle body rear portion and has a bead formed in a longitudinal direction at a part in the vehicle body front-rear direction.
According to the above aspect, plastic strain can be easily applied to the vicinity of the corner edge portion. That is, plastic strain can be applied to the vicinity of the corner portion to work-harden the corner portion, and buckling strength of the vehicle body frame can be ensured. This can suppress an increase in the unit price of the material (i.e., an increase in cost) without increasing the grade of the material of the vehicle frame.
Effect of the utility model
According to the present invention, the bending strength of the vehicle frame can be ensured by forming the corner edge portion to have the target radius of curvature and imparting plastic strain to the vicinity of the corner edge portion.
Drawings
Fig. 1 is a perspective view of a rear portion of a vehicle including a vehicle frame according to an embodiment of the present invention, as viewed from the lower right.
Fig. 2 is a perspective view of a vehicle center portion including a vehicle body frame according to an embodiment of the present invention, as viewed from the upper left.
Fig. 3 is a perspective view showing a vehicle body frame according to an embodiment.
Fig. 4 is a cross-sectional view showing a vehicle body frame according to an embodiment.
Fig. 5 is a perspective view illustrating blank forming in the first pressing step in the method of manufacturing a vehicle body frame according to the embodiment.
Fig. 6 is a perspective view illustrating die forming in the first pressing step in the method of manufacturing a vehicle body frame according to the embodiment.
Fig. 7 is a perspective view showing a temporary frame formed by a first pressing step according to an embodiment.
Fig. 8 is a cross-sectional view showing a temporary frame formed by a first pressing process according to an embodiment.
Fig. 9 is a perspective view illustrating secondary forming in the second pressing step in the method of manufacturing a vehicle body frame according to the embodiment.
Fig. 10 is a cross-sectional view showing a vehicle body frame formed by a second pressing step according to an embodiment.
Description of the symbols:
10 frames (floor frame, front and rear frame), 11 cross members (frame, cross frame), 12 rear frames (frame, front and rear frame), 12a part of the vehicle body in the front-rear direction, 15, 16 beads, 17 top side frame half (top side half), 18 flange side frame half (flange side half), 21 roof, 22 side wall, 22a top side wall (part of side wall), 23 flange, 24 convex corner (corner), 25 concave corner (corner), 27 concave (bead), 55 temporary frame, 57 temporary concave (bead), 58 first bend, 59 second bend, 61 third bend, 62 fourth bend, L1 pair of convex corner and top perimeter, L2 pair of first bend and temporary concave perimeter, L3 top side frame half perimeter, L4 pair of first bend, pair of second bend, Perimeter of the pair of third curved portions and temporary recessed portions, Rt target top radius of curvature, Rf target flange portion radius of curvature, R1 first radius of curvature, R2 second radius of curvature, R3 third radius of curvature, R4 fourth radius of curvature, W1 recessed width, D1 recessed depth.
Detailed Description
Hereinafter, a frame according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow LH indicates the left side of the vehicle.
< vehicle frame >
As shown in fig. 1 and 2, a vehicle Ve includes a plurality of frames as frame members constituting a vehicle body frame. Specifically, the vehicle Ve includes, for example, a floor frame 10, a cross member 11, a rear frame 12, and the like as a plurality of vehicle frames.
The floor frame 10 and the rear frame 12 are front and rear frames provided in the front-rear direction of the vehicle body. The cross member 11 is a lateral frame provided toward the vehicle width direction. The floor frame 10, the cross member 11, and the rear frame 12 extend in the longitudinal direction, for example, and are formed in a hat-shaped cross section so as to ensure strength and rigidity against a load input from the longitudinal direction of each frame.
Hereinafter, the floor frame 10 will be described as a representative example of the plurality of vehicle bodies, and the floor frame 10 will be described as the vehicle body 10.
As shown in fig. 3 and 4, the vehicle body frame 10 is a press-formed member formed by press-forming a metal plate material (steel plate) into a hat shape in cross section and extending in the vehicle body front-rear direction (longitudinal direction), for example. The frame 10 has a top portion 21, a pair of side wall portions 22, a pair of flange portions 23, a pair of convex corner portions 24, and a pair of concave corner portions 25.
The top portion 21 is disposed in the width direction, and has a recessed portion 27 (rib in the present embodiment) at the center in the width direction. The recessed portion 27 is formed in a concave shape so as to be recessed inward of the vehicle body frame 10. The recessed portion 27 is formed in a bead shape (bead) extending in the longitudinal direction of the vehicle body frame 10. The pair of side wall portions 22 are bent from outer end portions (specifically, convex corner portions 24) of the top portion 21 toward the flange portion 23 (specifically, concave corner portions 25). The pair of flange portions 23 extend in the width direction from respective end portions (specifically, respective recessed corner portions 25) of the pair of side wall portions 22 on the side opposite to the top portion 21 toward the outside of the vehicle frame 10.
The frame 10 is formed in a hat shape in a product shape (specifically, a cross-sectional shape of the frame 10) by the top portion 21, the pair of side wall portions 22, the pair of flange portions 23, and the like. Hereinafter, the cross-sectional shape of the cap shape may be referred to as a "cap-shaped cross-section" or a "cross-sectional cap shape".
A pair of convex corner portions 24 are provided at both ends of the top portion 21. The convex corner portion 24 is formed to protrude outward of the vehicle frame 10 by a curved portion where the top portion 21 and the side wall portion 22 intersect. The convex corner portion 24 is formed in a curved shape having a curvature radius Rt. Hereinafter, the curvature radius Rt of the convex corner portion 24 may be referred to as a "target top curvature radius Rt". The convex corner portion 24 is formed in a bead shape extending in the longitudinal direction of the vehicle frame 10.
A pair of recessed corner portions 25 are provided at each end portion of the pair of side wall portions 22 on the opposite side to the top portion 21. The recessed corner portion 25 is formed to be recessed toward the inside of the vehicle body frame 10 by a curved portion where the flange portion 23 and the side wall portion 22 intersect. The recessed corner portion 25 is formed in a curved shape having a curvature radius Rf. Hereinafter, the radius Rf of the recessed corner portion 25 may be referred to as "target flange curvature radius Rf". The recessed corner portion 25 is formed in a bead shape extending in the longitudinal direction of the vehicle body frame 10.
Hereinafter, the longitudinal direction of the vehicle body frame 10 may be referred to as "X direction" and the width direction of the vehicle body frame 10 may be referred to as "Y direction".
As shown in fig. 2, the frame 10 is formed into a closed cross section together with the floor panel 14 by, for example, a pair of flange portions 23 joined to the floor panel 14. That is, the vehicle body frame 10 is a member having high strength and rigidity, and functions as a framework member or a reinforcing member of the vehicle Ve. The metal plate material used for the vehicle body frame 10 is, for example, a high-tensile steel plate.
Hereinafter, a method of manufacturing the vehicle body frame 10 will be described.
< method for manufacturing vehicle body frame >
(first punching step)
As shown in fig. 5, in the first press step, a blank (raw material) 52 of the vehicle body frame 10 (see fig. 3) is formed from a metal plate material 51 (e.g., high-tensile steel plate) by blank forming (blank working, blanking working). The blank 52 is formed along the contour of the unfolded frame 10.
Next, as shown in fig. 6, in the first pressing step, the blank 52 (see fig. 5) is die-formed to form the basic shape of the vehicle body frame 10. Hereinafter, the temporary formed member formed in the basic shape of the vehicle body frame 10 may be referred to as a "temporary vehicle frame 55".
At the time of die forming, for example, strain is applied to the top portion 56 side of the temporary frame 55 by a pad (pad) of the die forming apparatus.
In the first pressing step in the embodiment, the blank 52 is formed into the provisional frame 55 by die forming, but the present invention is not limited thereto. As another example, the blank 52 may be formed into the temporary frame 55 by drawing (draw) forming or the like.
As shown in fig. 7 and 8, the temporary frame 55 includes a temporary depressed portion (rib according to the embodiment) 57, a pair of first bent portions 58, a pair of second bent portions 59, a pair of third bent portions 61, and a pair of fourth bent portions 62.
The temporary recessed portion 57 is formed flat at the center in the Y direction in the top portion 56 of the temporary frame 55 (i.e., a portion corresponding to the top portion 21 (see fig. 4) of the frame 10). The temporary depressed portion 57 forms a concave portion together with the pair of first bent portions 58 between the pair of first bent portions 58.
The pair of first bent portions 58 are provided at positions corresponding to the pair of convex corner portions 24 (see fig. 4) of the vehicle body frame 10, and are formed continuously with both ends in the Y direction in the temporary recessed portion 57. The first curved portion 58 is formed as a convex portion curved with a first radius of curvature R1 so as to protrude toward the opposite side of the fourth curved portion 62 (i.e., the outer side of the temporary frame 55) with respect to the temporary recessed portion 57. The first bent portion 58 is formed in a bead shape extending in the X direction (longitudinal direction) of the temporary frame 55. The first radius of curvature R1 is, for example, 10mm, and is set larger than the target top radius of curvature Rt (see fig. 4).
The pair of second bent portions 59 are provided at positions corresponding to the pair of convex corner portions 24 (see fig. 4) of the body frame 10, and are formed continuously with the respective Y-direction outer ends of the pair of first bent portions 58. The second curved portion 59 is formed as a concave portion curved with the second radius of curvature R2 so as to be concave toward the inside of the temporary frame 55, and extends from the end of the first curved portion 58 to the third curved portion 61. That is, the end of the first curved portion 58 is the first switching portion 64 of the radius of curvature R1 of the first curved portion 58 and the radius of curvature R2 of the second curved portion 59.
The second bending portion 59 is formed in a bead shape extending in the X direction (longitudinal direction) of the temporary frame 55. The second radius of curvature R2 is, for example, 10mm, and is set larger than the target top radius of curvature Rt (see fig. 4).
The pair of third bent portions 61 are provided at positions corresponding to the pair of side wall portions 22 (see fig. 4) of the body frame 10, and are formed continuously with respective end portions of the pair of second bent portions 59 on the side of the pair of fourth bent portions 62. The third curved portion 61 is formed as a convex portion curved with a third radius of curvature R3 so as to protrude outward of the temporary frame 55, and extends from the end of the second curved portion 59 to the fourth curved portion 62.
That is, the end of the second curved portion 59 is the second switching portion 65 of the radius of curvature R1 of the second curved portion 59 and the radius of curvature R3 of the third curved portion 61. The third radius of curvature R3 is, for example, 10mm, and is set larger than the target top radius of curvature Rt (see fig. 4).
The pair of fourth bent portions 62 are provided at positions corresponding to the pair of side wall portions 22 (see fig. 4) of the body frame 10 and at positions corresponding to the pair of flange portions 23 (see fig. 4) of the body frame 10. The pair of fourth bent portions 62 is continuously formed with each end portion of the pair of third bent portions 61 on the opposite side to the pair of second bent portions 59. The fourth curved portion 62 is formed as a concave portion curved with a fourth radius of curvature R4 so as to be concave toward the inside of the temporary frame 55, and extends from the end of the third curved portion 61 to a portion corresponding to the flange portion 23 (see fig. 4) of the frame 10.
That is, the end of the third curved portion 61 is the third switching portion 66 of the radius of curvature of the third curved portion 61 and the radius of curvature of the fourth curved portion 62. The fourth radius of curvature R4 is, for example, 10mm, and is set larger than the target flange radius of curvature Rf (see fig. 4).
The fourth radius of curvature R4 may be the same as or different from the first radius of curvature R1, the second radius of curvature R2, and the third radius of curvature R3.
(second punching step)
As shown in fig. 9, in the second pressing step, the temporary frame 55 (see fig. 6) formed in the first pressing step is formed into the vehicle frame 10 by secondary (restart) forming (i.e., re-pressing).
As shown in fig. 3, 8, and 10, the vehicle frame 10 has a top-side frame half (top-side half of the embodiment) 17 and a flange-side frame half (flange-side half of the embodiment) 18.
The top-side frame half 17 is a portion on the top 21 side in the hat-shaped cross section of the vehicle frame 10. The top side frame half 17 is formed by the pair of first bent portions 58, the pair of second bent portions 59, the pair of third bent portions 61, and the temporary recessed portion 57 by secondary forming.
The top side frame half 17 has a top portion 21, a pair of convex corner portions 24, and a pair of top side wall portions 22 a. The top side wall portion 22a is formed by a part of the side wall portion 22 on the top 21 side.
The top 21 has a pair of outer tops 26 formed at intervals in the Y direction and a recessed portion (rib) 27 formed between the pair of outer tops 26. In the recessed portion 27, a recess width in the Y direction between the pair of outer side top portions 26 is formed as W1, and a recess depth is formed as D1. The recess width W1 is the width in the Y direction between the pair of outer side top portions 26. The recess depth D1 is the depth from the pair of outer side crests 26 to the recess 27.
The convex corner portion 24 is formed as a convex portion at the intersection of the outer top portion 26 and the side wall portion 22 (specifically, the top side wall portion 22a) so as to protrude outward of the vehicle body frame 10. When the temporary frame 55 is formed into the frame 10 by the secondary forming, the first curved portion 58 and the second curved portion 59 are deformed into the apex curved portion, and the convex ridge portion 24 is formed by the apex curved portion. The pair of convex ridge portions 24 are provided with crests 21 (i.e., recesses 27).
The convex corner portion 24 is formed in a bead shape extending in the X direction (longitudinal direction) of the vehicle body frame. The convex corner portion 24 is formed, for example, with a target apex curvature radius Rt of 3mm, which is smaller than the first curvature radius R1 of the first curved portion 58 and the second curvature radius R2 of the second curved portion 59.
Here, the first radius of curvature R1 of the first curved portion 58 formed in the first pressing step is larger than the target top radius of curvature Rt of the product shape (i.e., the convex corner portion 24). Therefore, it is considered that wrinkles are generated due to the excess material of the first bent portion 58 when the convex corner portion 24 is formed in the second pressing step.
Therefore, at least one of the recess width W1 and the recess depth D1 of the recess 27 is adjusted so that the circumferential length L1 of the pair of convex corner portions 24 and the apex portion 21 is the same as the circumferential length L2 of the pair of first bent portions 58 and the temporary recess 57. This can suppress the occurrence of wrinkles in the pair of convex corner portions 24 and the recessed portions 27 formed in the second pressing step, and can make the plate thickness of the frame 10 uniform to maintain the quality.
The side wall portion 22 is continuous with the convex corner portion 24, and linearly extends from the convex corner portion 24 to the concave corner portion 25. As described above, the top-side frame half 17 is formed of the top portion 21, the pair of convex corner portions 24, and the pair of top-side wall portions 22 a. The top-side frame half 17 includes a pair of top-side wall portions 22a in addition to the top portion 21 and the pair of lobe ridge portions 24.
Here, the first radius of curvature R1, the second radius of curvature R2, and the third radius of curvature R3 are adjusted so that the circumferential length L3 of the top-side frame half 17 is equal to the circumferential length L4 of the pair of first curved portions 58, the pair of second curved portions 59, the pair of third curved portions 61, and the temporary recessed portion 57.
This can suppress the occurrence of wrinkles in the top-side frame half 17 formed in the second pressing step, and can make the plate thickness of the vehicle body frame 10 uniform to maintain the quality.
Further, plastic strain may be applied to the vicinity of the lobe ridge portion 24 to work-harden the same, and plastic strain may be applied to the side wall portion 22 (particularly, the top side wall portion 22a) to work-harden the same. This can increase the yield stress of the vehicle body frame 10, and can reliably ensure a target buckling strength.
The first radius of curvature R1, the second radius of curvature R2, and the third radius of curvature R3 may be the same or different.
The flange-side frame half 18 is a portion on the flange portion 23 side in the hat-shaped cross section of the vehicle frame 10. The flanged side frame half 18 is formed by the fourth bent portion 62 by secondary forming. The flange-side frame half 18 has a pair of flange side wall portions 22b, a pair of recessed corner portions 25, and a pair of flange portions 23. The flange side wall portion 22b is formed by a portion of the side wall portion 22 on the flange portion 23 side. The flange side wall 22b and the top side wall 22a form a side wall 22.
The recessed corner portion 25 is formed as a recessed portion recessed inward of the vehicle body frame 10 at the intersection of the side wall portion 22 (particularly, the flange side wall portion 22b) and the flange portion 23. When the temporary frame 55 is formed into the frame 10 by the secondary forming, a part of the fourth bent portion 62 is deformed into a concave portion of the flange bent portion, and the recessed corner portion 25 is formed by the deformed flange bent portion.
The recessed corner portion 25 is formed in a bead shape extending in the X direction (longitudinal direction) of the vehicle body frame 10. The recessed corner portion 25 is formed with a target flange portion curvature radius Rf of 3mm smaller than the fourth curvature radius R4 of the fourth curved portion 62, for example.
The pair of flange portions 23 extend in the Y direction from the pair of recessed corner portions 25 toward the outside of the vehicle body frame 10.
As described above, according to the method of manufacturing the vehicle body frame 10 of the embodiment, as shown in fig. 8 and 10, two bent portions, i.e., the first bent portion 58 and the second bent portion 59, are formed in the first pressing step. In the second pressing step, the convex ridge portion 24 is formed by deforming two curved portions, i.e., the first curved portion 58 and the second curved portion 59, into one apex curved portion of the target apex curvature radius Rt.
This makes it possible to form the convex corner portion 24 of the vehicle body frame 10 to the target top curvature radius Rt, and easily apply plastic strain to the vicinity of the convex corner portion 24. That is, the vicinity of the convex corner portion 24 can be work-hardened by applying plastic strain to the vicinity of the convex corner portion 24, and the yield stress can be increased.
Here, for example, in the vehicle body frame 10 formed in a hat-shaped cross section, the angular edge portion (for example, the convex angular edge portion 24) bent in a ridge line shape is a portion having high strength and rigidity in shape. Therefore, by applying plastic strain to the vicinity of the convex corner portion 24 and work-hardening the same, it is possible to increase the yield stress and to ensure the buckling strength of the vehicle body frame 10 as a target buckling strength. This makes it possible to suppress an increase in the unit price of the material (i.e., an increase in cost) without increasing the grade of the material of frame 10.
In the first press step, the fourth bent portion 62 continuous with the third bent portion 61 is formed. In the second pressing step, the recessed corner portion 25 is formed. Here, the fourth radius of curvature R4 of the fourth curved portion 62 is made larger than the target flange portion radius of curvature Rf of the flange curved portion (i.e., the reentrant angular edge portion 25). This allows the vicinity of the recessed corner portion 25, the side wall portion 22 (particularly, the flange side wall portion 22b), and the flange portion 23 to be work-hardened by applying plastic strain to the vicinity of the recessed corner portion 25, the side wall portion 22, and the flange portion 23.
That is, the vicinity of the recessed corner portion 25 of the frame 10 formed in the hat-shaped cross section and the side wall portion 22 can be work-hardened by applying plastic strain thereto, and the flange portion 23 can also be work-hardened by applying plastic strain thereto. This can increase the yield stress of the vehicle body frame 10 and more reliably ensure the target buckling strength.
The convex corner portion 24, the concave corner portion 25, the first bent portion 58, and the second bent portion 59 are formed in bead shapes extending in the longitudinal direction of the vehicle body frame 10, for example. This can increase the strength over the entire length of frame 10, and can ensure the target buckling strength of frame 10 more reliably.
The flange bent portion formed by the fourth bent portion 62 is set to the recessed corner portion 25 of the target flange curvature radius Rf. Therefore, the recessed corner portion 25 can be formed on the side wall portion 22 opposite to the raised corner portion 24. This can improve the strength and rigidity of frame 10, and can firmly support frame 10. Therefore, the target buckling strength of the vehicle frame 10 can be ensured more reliably.
In the first pressing step, the temporary formed member of the frame 10 (i.e., the temporary frame 55) can be manufactured at low cost by using a conventional forming method such as blank forming, die forming, and drawing.
In the first pressing step, blank forming, die forming, drawing forming, and the like are employed. As a result, in the temporary frame 55, the first bent portion 58, the second bent portion 59, and the third bent portion 61 can be formed at the positions corresponding to the top-side frame half 17 of the frame 10, and the fourth bent portion 62 can be formed at the positions corresponding to the flange-side frame half 18.
Then, the temporary frame 55 formed in the first pressing step is subjected to secondary forming (re-pressing) in the second pressing step, whereby the frame 10 (i.e., a formed member) is formed. Thus, by separating the second pressing step from the first pressing step, the accuracy of the frame 10 as a formed member can be improved, and for example, the target top curvature radius Rt of the convex corner portion 24 and the target flange curvature radius Rf of the concave corner portion 25 can be ensured. This can ensure a target buckling strength for the buckling load of the convex corner portion 24 and the concave corner portion 25 of the vehicle body frame 10, for example.
Returning to fig. 2, the vehicle frame of the embodiment is formed by a method of manufacturing the vehicle frame. When the vehicle body frame is used as the floor frame 10 (i.e., the front and rear frames), the beads (e.g., the recessed portions 27) can be formed in the longitudinal direction in the vehicle body front-rear direction. For example, when the vehicle body frame is used as the cross member (lateral frame) 11, the beads 15 can be formed in the longitudinal direction in the vehicle width direction.
Therefore, when the vehicle body frame is used as the front and rear frames (i.e., the floor frame 10) and the lateral frame (i.e., the cross member 11), the buckling strength of the vehicle body frame can be secured as the target buckling strength. Thus, the strength can be improved without increasing the grade of the material of the vehicle frame, and a high-strength vehicle frame can be manufactured at low cost.
Returning to fig. 1, by forming the vehicle body frame of the embodiment by the method of manufacturing the vehicle body frame, when the vehicle body frame (specifically, the rear frame 12) is used as a front-rear frame at the rear portion of the vehicle body, the bead 16 can be formed in the longitudinal direction at the portion 12a in the front-rear direction of the vehicle body. Therefore, in the rear frame 12, the portion 12a in the vehicle body longitudinal direction where the bead 16 is formed can be a portion having high strength and rigidity, and the portion 12b where the bead 16 is not formed can be a fragile portion capable of appropriately absorbing impact energy.
Thus, the rear frame 12 having a high strength and rigidity portion and a weak portion can be formed from one blank. Therefore, it is not necessary to use two different members, i.e., a high-rigidity member and a weak member, in order to provide the rear frame 12 with a high-strength and high-rigidity portion and a weak portion, and the number of steps and cost for manufacturing the rear frame 12 can be reduced.
The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
In addition, the components in the above embodiments may be replaced with known components as appropriate without departing from the scope of the invention, and the above modifications may be combined as appropriate.
Claims (9)
1. A vehicle frame (10) characterized in that,
the frame is a press-formed part formed by press-forming into a hat-shaped cross section, and includes:
a top portion (21);
a pair of convex corner portions (24) having a target top curvature radius (Rt) and provided at both ends of the top portion (21);
a pair of side wall portions (22) bent and extended from the respective convex ridge portions (24) of the top portion (21);
a pair of recessed corner portions (25) having a target flange curvature radius (Rf) provided at each end portion of the pair of side wall portions (22) on the opposite side of the top portion (21); and
a pair of flange sections (23) extending in the width direction from each of the recessed corner sections (25) on the opposite side of the pair of side wall sections (22) from the top section (21) toward the outside of the vehicle body frame (10),
wherein the pair of convex corner portions (24) and the pair of concave corner portions (25) are curved in a ridge line shape.
2. The vehicle frame of claim 1,
the top (21) has:
a pair of outer top portions (26) formed at intervals in the width direction of the vehicle body frame (10); and
and a rib (27) formed between a pair of the outer crests (26).
3. The vehicle frame of claim 2,
the pair of side wall parts (22) are each formed of a top side wall part (22a) and a flange side wall part (22b), the top side wall part (22a) being formed by a portion of the side wall part (22) on the top (21) side, and the flange side wall part (22b) being formed by a portion of the side wall part (22) on the flange part (23) side.
4. The vehicle frame of claim 3,
the pair of convex corner portions (24) are formed as convex portions protruding outward of the vehicle body frame (10) at the intersection of the outer top portion (26) and the top side wall portion (22 a).
5. The vehicle frame of claim 3,
the pair of recessed corner portions (25) are formed as recessed portions recessed inward of the vehicle body frame (10) at the intersection of the flange side wall portion (22b) and the flange portion (23).
6. The vehicle frame of any of claims 1-5,
the pair of convex corner portions (24) and the pair of concave corner portions (25) are formed in a bead shape extending in the longitudinal direction of the vehicle frame (10).
7. The vehicle frame of claim 3,
a top side half (17) formed by the top portion (21), the pair of convex ridge portions (24), and the pair of top side wall portions (22a),
a flange-side half section (18) formed by the pair of recessed corner sections (25), the pair of flange sections (23), and the pair of flange-side wall sections (22b),
the frame (10) is formed by the top-side half (17) and the flange-side half (18).
8. The vehicle frame of any of claims 1-5,
the vehicle body frame is a front-rear frame provided in a front-rear direction of a vehicle body and having a reinforcing rib formed in a longitudinal direction, or a lateral frame provided in a vehicle width direction and having a reinforcing rib formed in a longitudinal direction.
9. The vehicle frame of any of claims 1-5,
the frame is a front and rear frame that is provided in the front-rear direction of the vehicle body at the rear of the vehicle body and has a reinforcing rib formed in the longitudinal direction at a part in the front-rear direction of the vehicle body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-022773 | 2021-02-16 | ||
| JP2021022773A JP7110423B1 (en) | 2021-02-16 | 2021-02-16 | BODY FRAME AND METHOD FOR MANUFACTURING BODY FRAME |
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|---|---|
| CN217496286U true CN217496286U (en) | 2022-09-27 |
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| CN202123262581.0U Active CN217496286U (en) | 2021-02-16 | 2021-12-23 | Vehicle frame |
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|---|---|---|---|---|
| JP4264054B2 (en) * | 2004-06-01 | 2009-05-13 | 株式会社神戸製鋼所 | Bending molding method and molding die used for the molding method |
| JP2010227995A (en) * | 2009-03-30 | 2010-10-14 | Kobe Steel Ltd | Method of forming curved channel member |
| JP2011067841A (en) * | 2009-09-25 | 2011-04-07 | Daihatsu Motor Co Ltd | Method of manufacturing hollow pillar-shaped part |
| JP2011206789A (en) * | 2010-03-29 | 2011-10-20 | Kobe Steel Ltd | Press forming method |
| JP5926089B2 (en) * | 2012-03-29 | 2016-05-25 | 東プレ株式会社 | Press molded product |
| JP2017099128A (en) * | 2015-11-24 | 2017-06-01 | 船井電機株式会社 | Power reception device |
| JP6696611B1 (en) * | 2019-05-13 | 2020-05-20 | Ｊｆｅスチール株式会社 | Press molding method |
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| JP2022124879A (en) | 2022-08-26 |
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