JP2005212533A - Inner panel for vehicular door and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner panel for a vehicular door and its manufacturing method which enables hemming process of the end parts of a plurality of doors, and can secure sufficient rigidity and strength for the inner panel of the door in the plurality of doors having different outer shapes. <P>SOLUTION: The inner panel is characterized in that a bead (30) is formed on a thin skin part (22A) including contour parts (20A, 20B) forming wheel arches (20Ar, 20Br). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an inner panel for a vehicle door that enables common use of an inner panel for two or more types of vehicle doors having different end dimensions, and a method for manufacturing the same.

  Large trucks and medium trucks are formed with arc-shaped notches, so-called `` wheel arches '', to avoid interference between the tires and the corners at the bottom of the doors when the tires are steered on the doors of the vehicle body. ing.

  In order to unify the design of large trucks and medium trucks, and to save the cost of the body (door), vehicle manufacturers may share the inner panels of vehicle doors.

As shown in FIG. 15, the large truck and the medium truck have different relative positions (distances L1, L2 to the wheel center) between the rear end De of the door and the center of the wheel (tires Ta, Tb).
That is, in a large truck, the distance (L1) from the rear end of the door to the wheel center may be located rearward (L2> L1) with respect to the middle wheel center (L2). In such a case, the wheel arch of the door must be different from A for large trucks and B for medium trucks in order to facilitate the steering of the wheels and to minimize splashing during rain.

  FIGS. 16 to 22 show the three-dimensional shape of the door inner panel and the manufacturing method (routing order) in the case where the press mold of the inner panel of the large truck and the medium truck having the above-described arrangement relation is used in common.

FIG. 16 is a view of the inner panel 1A of the door of the large truck as viewed obliquely from below and FIG. 17 is a view of the inner panel 1B of the door of the medium truck as viewed from obliquely upward.
18 to 22 are machining process diagrams showing the machining process of the inner panel of the door of the large truck after drawing.

In FIG. 16, an inner panel 1A of a large truck door is slanted from a hem surface 11A including a contour (edge) 10A, an edge flat surface 12A adjacent to the hem surface 11A, and the edge flat surface 12A. The slope portion 13A that rises to the edge, the central flat portion 14A that is parallel again to the edge flat surface 12A from the slope portion 13A, and occupies the maximum area in the panel, and the height from the edge flat surface 12A is An intermediate flat portion 15A between the partial flat surface 12A and the central flat surface 14A.
Of the edge portion 10A, the wheel arch (the region indicated by A and B in FIG. 15) is identified with a reference numeral 10Ar.

  Here, as shown in FIG. 22, the hem surface 11 </ b> A is a so-called “hemming process” in which the outer panel 50 </ b> A is folded at the end, and the leading end of the inner panel is sandwiched between the folded portion 52 and the unfolded portion 51. The surface of the inner panel 1 </ b> A that comes into contact with the back surface of the folded portion of the outer panel 50 is shown.

In the reference numerals of the portions of the medium truck door 1B shown in FIG. 17, A at the end of the reference numerals of the large truck in FIG.
The difference between the inner panel 1A of the large vehicle and the inner panel 1B of the middle-sized person is that the lengths of the edge flat surfaces 12A and 12B are different.

FIG. 18 shows a cross-sectional shape corresponding to the AA cross section of FIGS. 16 and 17 after drawing by press working of the common inner panel 1 of large and medium trucks, and shearing, so-called “trim cut”. It contains the surplus as it was thrown into the previous press.
That is, in the step shown in FIG. 18, the hem surface is not yet formed on the plate end (right end side) in a state where the flat steel plate is drawn.
Since FIG. 18 is a primary processed product common to large-sized and medium-sized products, A and B are not added to the end of the code of each part. In other words, reference numeral 12 denotes an edge flat surface, reference numeral 13 denotes a slope portion, and reference numeral 14 denotes a central flat portion.

  In the step shown in FIG. 19, the plate end 110 </ b> A including the hem surface is secondarily processed by pressing. In the drawing, a broken line indicates a plate end 110A including a hem surface formed by pressing.

  In the next step of FIG. 20, the surplus portion 16A is sheared and removed (trim cut) with a tool (cutter) Tc having the same shape as the contour of the inner panel 1A. A hem surface 11A is formed at the end of the plate.

  In the step of FIG. 21, an outer panel 50 </ b> A that has been bent at a right angle (hem flange 50 f) in advance to the contour portion is overlapped on the outer surface of the inner panel 1 </ b> A (the back surface of the hem surface 11 </ b> A). Then, the hem flange 50f of the outer panel 50A is folded back 360 degrees with respect to the original surface in a J shape (steps from FIG. 21 to FIG. 22).

  FIG. 22 shows a state in which the inner panel 1A and the outer panel 50A are integrated by hemming. The reference numerals of the parts in FIG. 22 are the same as those in FIGS. 1 and 3.

  The manufacturing process of the inner panel for the medium truck is the same as the manufacturing process of the inner panel for the large truck described above. After the process of FIG. 18, the region of the plate end 110A including the hem surface 11A in FIG. The only difference is that the trim cut position is extended to the right by a predetermined amount with respect to FIG.

Here, since the end portion of the door must be hemmed as described above, the lower end corner portion (edge flat surface) 12A of the door including the wheel arch portion 10Ar (see FIG. 16) and 10Br (see FIG. 17). Both (see FIG. 16) and 12B (see FIG. 17) must be flat to secure the hem surfaces 11A and 11B.
That is, the edge flat surfaces 12A and 12B are flat surfaces, which are strong and rigid, and the flat surfaces cannot be made large, and there are significant restrictions on the common use of the inner panel.

As another conventional technique, a technique that can be manufactured in a small process using an inexpensive mold has been proposed (for example, see Patent Document 1).
However, the proposed technology relates to a vehicle exterior panel and a method for manufacturing the same, and the target panel is limited to a resin, and as described above, a large truck and a medium-sized truck, particularly using a metallic panel. It does not solve the technical problems of trucks.
JP 2001-191344 A

  The present invention has been proposed in view of the above-described problems of the prior art. In a plurality of doors having different outer shapes, the plurality of doors can both be hemmed at the end, and the inner panel of the door can be used. An object of the present invention is to provide an inner panel of a vehicle door that can secure sufficient rigidity and strength and a method for manufacturing the same.

  The inner panel (2A, 2B) of the vehicle door of the present invention has a bead (30) on a thin skin portion (edge flat surface 22A) including contour portions (20A, 20B) forming a wheel arch (20Ar, 20Br). (Claim 1).

  Here, it is preferable in terms of strength that the bead (30) is arranged in a direction substantially normal to the contour (20A) forming the wheel arch (20Ar).

  The bead (30) has a length of 100 mm or more (Claim 2).

  The vehicle door inner panel (2A, 2B) manufacturing method of the present invention includes a drawing process (FIG. 5), a secondary forming process (FIG. 6), and a shearing process (FIG. 7). A bead (30) formed in the thin skin portion (edge flat surface 22A) of the inner panel (2A) of the door, and the secondary molding process (FIG. 6) is performed prior to the shearing step (FIG. 7); The hem surface (21A) is simultaneously pressed (claim 3).

  Further, in the method for manufacturing an inner panel for a vehicle door according to the present invention, in the secondary molding process (FIG. 6), the material of the portion where the hem surface (21A) and the bead (30) are formed is pressed. It is comprised so that it may project in the case of shaping | molding (Claim 4).

  Further, according to the method for manufacturing the inner panel (2A, 2B) of the vehicle door of the present invention, the portion where the material bead (30) is formed is separated from the free end of the material in the secondary forming step (FIG. 6). (Claim 5).

  According to the inner panel and the manufacturing method for a vehicle door of the present invention having the above-described configuration and manufacturing method, the bead (30) formed on the edge flat surface (22A) of the inner panel (2A) is molded. This improves the strength and rigidity of the edge flat surface (22A).

  By improving the strength and rigidity of the edge flat surface (22A), the length of the edge flat surface (22A) toward the wheel arch can be extended.

  By extending the length of the edge flat surface (22A) toward the wheel arch, it is possible to correspond to the inner panel of a plurality of types of doors, and the inner panel of a plurality of types of doors can be shared.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of an inner panel 2A of a large truck door in which an inner panel is shared with a medium truck, and FIG. 2 is an inner view at the time when a drawing process that can share a large truck and a medium truck is completed. A perspective view of panel 2M is shown. FIG. 3 is a three-dimensional perspective view of the inner panel 2A of the door of the large truck.
In FIG. 2, 20 </ b> A indicated by a two-dotted line indicates a contour for a large truck, and 20 </ b> B indicates a contour for a medium truck.

  1 to 3, an inner panel 2A of a large truck door (an inner panel primary processed product 2M at the time of drawing processing in FIG. 2) includes a hem surface 21A including a contour portion 20A that forms a wheel arch 20RA, An edge flat surface 22A (reference numeral 22 in FIG. 2) adjacent to the hem surface 21A, a slope portion 23A (reference numeral 23 in FIG. 2) rising obliquely from the edge flat surface 22A, and the edge from the slope portion 23A The central flat portion 24A (reference numeral 24 in FIG. 2), which becomes parallel again to the flat portion surface 22A and occupies the largest area in the panel, and the height from the flat edge portion 22A are the same as the flat edge portion 22A and the central portion. An intermediate flat surface 25A (reference numeral 25 in FIG. 2) between the flat surface 24A.

  In FIG. 3, a bead 30 is formed on the edge flat surface 22A including a contour portion 20A that forms a wheel arch 20Ar. The bead 30 is arranged in a normal direction with respect to the contour 20A forming the wheel arch 20Ar. The bead 30 has a length of 100 mm or more, and is separated from the contour portion 20A via the hem surface 21A.

In FIG. 2, the inner panel primary processed product 2M at the completion of the drawing process, which is a shape material of the inner panel 2A of the door of the large truck, is outside the contour portion 20A and has a contouring shear “ The surplus portion 200 before “trim cut” is included.
In addition, since the inner panel primary processed product 2M is common to both large and medium sizes, in FIG. 2, at the end of the code of each part, the sign of A representing large size, or the code representing medium size B is not attached.

  Next, with reference to FIGS. 5-9, the manufacturing process of the inner panel 2A of the door of a large truck is demonstrated in order of a process.

FIG. 5 shows the state of the primary processed product 2M of the inner panel at the time when drawing is completed, as in FIG.
That is, in the primary processing (drawing step), the two-dot difference line indicates a state before processing the steel plate as the material. In FIG. 5, a white arrow indicates a pressing direction.

  In FIG. 5, a base region, that is, a region 210 having a predetermined length from the terminal 200 </ b> E of the surplus portion 200 (a region where a hem surface is formed in the next process) 210 is pressed by a jig (not shown) and A region 220 adjacent to the right of the region 210 in which the hem surface is formed is formed slightly higher than the base region 210, and the slope portion 23 continues from the region 220, and the slope portion 23 continues. The central flat portion 24 is formed by drawing with a press.

  A portion of the region 220 adjacent to the right side of the region 210 where the hem surface is formed remains as the top of the bead 30 when the bead 30 is formed in the next step.

In the secondary molding process shown in FIG. 6, first, the central flat portion 24 is fixed (the side not deformed), and the region 210 where the hem surface is formed is shown by a white arrow as shown by the press work. Is deformed 21C as shown by a broken line.
On the other hand, in the region 220 on the right side of the region 210 where the hem surface is formed, one part remains as it is as the top portion 30t of the bead 30, but the rest is pushed down as shown by the broken line in the drawing. Thus, the edge flat surface 22A is formed.

In the shearing step shown in FIG. 7, shearing is performed by the “trim cut” tool Tc at a predetermined position of the region 210 where the hem surface is formed, and the contour 20 </ b> A and the hem surface 21 </ b> A of the inner panel 2 </ b> A are formed.
In addition, the XX cross section (cross section of bead 30) in FIG. 7 is shown in FIG.

  In the process of FIG. 8, the outer panel 50 </ b> A in which the contour portion is bent at a right angle (hem flange 50 f) in advance is overlapped on the outer surface of the inner panel 2 </ b> A (the back surface of the hem surface 21 </ b> A). Then, the hem flange 50f of the outer panel 50A is folded back 360 degrees with respect to the original surface in a J shape (steps from FIG. 8 to FIG. 9).

  FIG. 9 shows a state in which the inner panel 2A and the outer panel 50A are integrated by hemming.

  FIGS. 11 to 14 show the inner panel 2B of the medium truck door from the common material (primary processed product) 2M of the inner panel of the large truck door and the inner panel of the medium truck door shown in FIG. It is process drawing explaining the process which manufactures according to a routing.

In the secondary forming step of FIG. 11, first, the central flat portion 24 is fixed (the side not deformed), the region 210 where the hem surface is formed, and the region 210 where the hem surface is formed are adjacent to the right in the figure. A part of the region 220 is pressed by the press process as shown by the white arrow, and deformed 21D as shown by the broken line.
The remaining portion of the region 220 on the right side of the region 210 where the hem surface is formed is pushed down as shown by the broken line in the drawing and deformed to form the edge flat surface 22B.

  In the shearing step shown in FIG. 12, the inner panel contour 20B is formed by shearing with the “trim cut” tool Tc at a predetermined position of the deformed portion 21D and the contour portion 20B of the inner panel 2B. .

  In the process of FIG. 13, the outer panel 50 </ b> B that has been bent at a right angle (hem flange 50 f) in advance to the contour portion is overlapped on the outer surface of the inner panel 2 </ b> B (the rear surface of the hem surface 21 </ b> B). Then, the hem flange 50f of the outer panel 50B is folded back 360 degrees with respect to the original surface in a J shape (steps from FIG. 13 to FIG. 14).

  FIG. 14 shows a state in which the inner panel 2B and the outer panel 50B are integrated by hemming.

  According to the inner panel and the manufacturing method for a vehicle door of the present embodiment having the above-described configuration and manufacturing method, the edge 30 is formed by molding the bead 30 formed on the edge flat surface 22A of the inner panel 2A. The strength and rigidity of the flat part surface 22A are improved.

  By improving the strength and rigidity of the edge flat surface 22A, the length of the edge flat surface 22A toward the wheel arch can be extended.

  Since the length of the edge flat surfaces 22A and 22B toward the wheel arch can be extended, the inner panels of a plurality of types of doors can be used, and the inner panels of a plurality of types of doors can be shared.

  The illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention. For example, in FIG. 5, the region 210 where the hem surface is formed is the fixed side, but the central flat portion 24 is illustrated. May be the fixed side, and the regions 210 and 220 may be the side on which the aperture is formed.

The front view of the inner panel for large trucks concerning embodiment of this invention. The fragmentary perspective view of the shaped material at the time of completion | finish of primary processing with the inner panel in connection with embodiment of this invention. The perspective view of the inner panel for large trucks concerning embodiment of this invention. The perspective view of the inner panel for medium size trucks concerning the embodiment of the present invention. Process drawing explaining the primary shaping | molding process of the inner panel in connection with embodiment of this invention. Process drawing explaining the secondary shaping | molding process of the inner panel for large trucks concerning embodiment of this invention. Process drawing explaining the shearing process of the inner panel for large trucks concerning embodiment of this invention. Process drawing explaining the hemming process of the door panel for large trucks concerning embodiment of this invention. The fragmentary sectional view which showed the state at the time of the hemming process completion of the door panel for large trucks concerning embodiment of this invention. XX view of FIG. Process drawing explaining the secondary shaping | molding process of the inner panel for medium sized trucks in connection with embodiment of this invention. Process drawing explaining the shear process of the inner panel for medium size trucks in connection with embodiment of this invention. Process drawing explaining the hemming process of the door panel for medium-sized trucks in connection with embodiment of this invention The fragmentary sectional view which showed the state at the time of the hemming process completion of the medium-sized truck door panel in connection with embodiment of this invention. The layout which shows the positional relationship from the door rear end of a large sized truck and a medium sized truck to the wheel center. The perspective view of the inner panel of the heavy truck by a prior art. The perspective view of the inner panel of the medium sized truck by a prior art. The process figure explaining the primary shaping | molding process of the inner panel in a prior art. Process drawing explaining the secondary shaping | molding process of the inner panel in a prior art. The process figure explaining the shearing process of the inner panel in a prior art. Process drawing explaining the hemming process of the door panel in a prior art. The fragmentary sectional view which showed the state at the time of the hemming process completion of the door panel in a prior art.

Explanation of symbols

2A, 2B ... Inner panel 20A, 20B ... Contour / edge 21A, 21B ... Hem surface 22A, 22B ... Edge flat surface 23A, 23B ... Slope 24A, 24B ...・ Central flat part 30 ... Bead
50A ... Outer panel
200 ... surplus part

Claims (5)

  An inner panel of a vehicle door, wherein a bead is formed in a thin skin portion including a contour portion forming a wheel arch.   The inner panel for a vehicle door according to claim 1, wherein the bead has a length of 100 mm or more.   A bead and a hem surface that have a drawing process, a secondary molding process, and a shearing process, and the secondary molding process is performed prior to the shearing process and is formed in the thin skin portion of the inner panel of the door A method for manufacturing an inner panel of a vehicle door, wherein the press working is simultaneously performed.   4. The manufacturing method according to claim 3, wherein the material of the portion forming the hem surface and the portion forming the bead is stretched during press forming in the secondary forming step.   The manufacturing method according to any one of claims 3 and 4, wherein a place where a bead of material is formed is arranged in a portion separated from a free end of the material in the secondary forming process.

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