JP5824483B2 - Panel member forming method - Google Patents

Description

  The present invention relates to a method for forming a panel member having an edge portion in which an outer member and an inner member are overlapped, and a distal end portion of the outer member and a distal end portion of the inner member are fastened together by winding.

  2. Description of the Related Art Conventionally, panel members in which an outer panel (outer member) and an inner panel (inner member) are overlapped and these edges are fastened are widely used in automobile bonnets, trunks, doors, and the like.

  This type of panel member may be configured with a three-dimensional shape having many curvatures at the edge, or may be configured with a plate member having portions with different rigidity, shape, or the like. Therefore, it is possible to form panel members with high appearance quality by reducing the number of steps involved in forming panel members with tight edges and easily forming pre-bending parts with desired shapes. A method for forming a panel member is proposed (Patent Document 1).

  In this molding method, after the plate member is press-molded into a molded product shape, a portion other than the molded product of the plate member is cut out to form a panel member having a molded product shape. Further, the edge of the panel member including the cut end is formed into a curl shape by a curl bending die. When press molding is performed, a preliminary bending portion is formed at a portion that becomes an edge portion of the panel member, and the edge portion of the panel member on which the preliminary bending portion is formed is formed into a curl shape by a curl bending die. Has been.

Japanese Patent No. 5016289

  By the way, for example, the outer panel 1 having a three-dimensional shape shown in FIG. 9 may be wound around an inner panel (not shown) by the curl punch 3 while being placed on the mounting table 2. A pre-bending portion (flange) 1 a is formed on the front end side of the outer panel 1 in front of the parting line 4.

  Since the outer panel 1 has a three-dimensional shape, the shape changes along the panel surface direction (flange width direction) intersecting the molding direction while being placed on the mounting table 2. For this reason, especially when the curl molding is performed at the pre-bending portion 1a having a relatively large angle α with respect to the traveling direction (molding direction) of the curl punch 3, the pre-bending portion 1a is deformed to the mounting table 2 side. That is, there is a problem that buckling occurs.

  The present invention has been made in consideration of such problems, and it is possible to surely suppress the occurrence of buckling in the tightening portion with a simple process, and to improve the appearance quality. An object of the present invention is to provide a method for forming a possible panel member.

  The present invention relates to a method for forming a panel member in which an outer member and an inner member are overlapped, and an outer tip end portion of the outer member and an inner tip end portion of the inner member are fastened to each other by winding. It is.

The molding method, along parting lines which become the edge of the product shape, and facilities the bending in advance the outer tip, the outer wall direction outer tip worked flexural intersects the molding direction of the curl mold The process of making it the state extended in flat form along this . This molding method includes a step of superposing the inner member and the outer member in a state where the inner tip portion is spaced inward from the outer tip portion. This forming method includes a step of providing an edge portion fastened by winding by curling the outer tip portion and the inner tip portion to a parting line with a curl mold.

Further, in this molding method, the molding direction upstream side of the curl mold from parting line at the outer tip portion which is bent, it is preferable that the preliminary bend portion.

Further, in this molding method, the bending processed outer tip, the maximum angle formed between the molding direction as viewed along the outer surface direction, is set toward the formation planned direction of edges within 1 ° or less It is preferable.

  According to the present invention, the outer tip portion of the outer member is previously bent along the parting line. For this reason, even if it is an outer member which has a three-dimensional shape, an outer front-end | tip part can be arrange | positioned in a desired shaping | molding attitude | position with respect to a curl shaping | molding die. Therefore, no lifting or the like occurs in the winding portion at the outer tip during curl molding. Thereby, it is possible to reliably suppress the occurrence of buckling in the circumferential direction of the outer tip portion by a simple process, and it is possible to improve the appearance quality.

It is a partial cross section perspective view of the panel member to which the forming method concerning the embodiment of the present invention is applied. It is the figure which showed FIG. 1 from the A arrow direction. FIG. 3 is a cross-sectional explanatory view taken along line III-III in FIG. 1 of the panel member. It is a perspective explanatory view of the outer panel which constitutes the panel member. It is principal part cross-sectional explanatory drawing of the said outer panel. It is explanatory drawing of the curl shaping | molding apparatus which performs curl shaping | molding to the said panel member. It is operation | movement explanatory drawing of the said curl shaping | molding apparatus. It is explanatory drawing at the time of performing seam shaping | molding on the said panel member after the said curl shaping | molding. It is explanatory drawing of the conventional outer panel.

  As shown in FIG. 1, the panel member 10 which concerns on embodiment of this invention is comprised as a rear part door of a motor vehicle, for example. Although not shown, the panel member 10 can be used as, for example, an automobile bonnet, trunk, front door, and the like.

  The panel member 10 is formed by overlapping an outer panel (outer member) 12 and an inner panel (inner member) 14 and having an edge 16 fastened by tightening. The edge 16 of the panel member 10 extends three-dimensionally over the desired range of the automobile rear door. The edge portion 16 constitutes an edge portion of a product shape after being bent along a parting line 18 to be described later.

  In the panel member 10, for example, the window frame 17 is formed by the inner panel 14. The inner panel 14 is made of, for example, an iron-based material, while the outer panel 12 is made of, for example, aluminum (alloy). As the outer panel 12 and the inner panel 14, for example, a sheet metal material punched into a predetermined shape is used.

  The edge 16 extends three-dimensionally in the rear door of the automobile, for example, in the range indicated by the belt-like mesh portion H in FIG. The edge portion 16 may be provided so as to extend three-dimensionally over the entire circumference of the rear door.

  As shown in FIGS. 1 and 3, at the edge portion 16, the outer front end portion 12 a of the outer panel 12 is included in the inner panel 14, and the inner front end portion 14 a of the inner panel 14 is the outer front end portion of the outer panel 12. In a state of being included in 12a, it is wound.

  Next, a method for forming the panel member 10 will be described.

  First, as shown in FIGS. 4 and 5, the outer panel 12 is drawn (press-molded). The outer panel 12 is molded into a three-dimensional shape, and an outer distal end portion 12a to be wound is provided on the distal end side (upstream side in the molding direction) from the parting line 18.

  In the present embodiment, the outer distal end portion 12 a is bent along the parting line 18. The bent outer tip 12a extends in a flat plate shape along the outer surface direction (arrow B direction) that intersects the forming direction (arrow A direction).

  Further, a pre-bending portion 12 ae is formed in front of the parting line 18 in the bent outer front end portion 12 a. As shown in FIG. 5, the outer tip 12 a has a maximum angle θ that is uniformly set within the angle range of 1 ° with the molding direction seen along the outer surface direction. The angle θ is an angle formed by the outer tip 12a and the direction of travel of the curl punch (described later) with the parting line 18 as a fulcrum. That is, the outer front end portion 12a is bent in accordance with the traveling direction of the curl punch.

  Next, as shown in FIG. 6, the outer panel 12 and the inner panel 14 are overlapped with each other and placed on the curl forming apparatus 20. At that time, the outer front end portion 12a of the outer panel 12 is disposed so as to protrude outward by a predetermined length from the inner front end portion 14a of the inner panel 14. The inner panel 14 is press-molded, and a preliminary bending portion 14ae is formed in front of the inner tip portion 14a.

  The outer panel 12 and the inner panel 14 that are overlapped with each other are placed on a placing table 22 that constitutes the curl forming apparatus 20. The outer panel 12 and the inner panel 14 are pressed and held on the mounting table 22 by a pressing pad 23.

  On the mounting table 22, a curl punch (curl forming die) 26 having a curl forming part 24 constituted by a curved surface is slidably disposed. The curl punch 26 moves on the mounting table 22 in the direction of the arrow, thereby starting the curl molding of the outer tip 12a of the outer panel 12 via the curl molding unit 24.

  In this case, in this embodiment, as shown in FIGS. 4 and 5, the outer front end portion 12 a of the outer panel 12 is previously bent along the parting line 18. For this reason, even if the outer panel 12 has a three-dimensional shape, the outer tip 12 a can be arranged in a desired molding posture with respect to the curl punch 26.

  More specifically, the bent outer tip 12a extends in a flat plate shape along the outer surface direction (arrow B direction) that intersects the molding direction (arrow A direction). Accordingly, the height of the pre-bending portion 12ae is arranged at substantially the same position along the width direction (outer surface direction) of the curl punch 26 (the flange width direction of the outer tip portion 12a). Yes.

  Thereby, it is possible to prevent as much as possible the occurrence of buckling at the tightening portion of the outer front end portion 12a when the outer front end portion 12a is curled. For this reason, it is possible to reliably suppress the occurrence of buckling in the circumferential direction of the outer distal end portion 12a with a simple process, and the effect that the appearance quality can be improved is obtained.

  Further, the outer tip 12a has a maximum angle θ with the molding direction viewed along the outer surface direction set within an angle range of 1 ° or less. This is because if the maximum angle θ exceeds 1 °, a folding point may be generated on the surface of the outer tip 12a.

  As shown in FIG. 6, when the curl punch 26 further moves in the direction of the arrow, the inner tip 14a of the inner panel 14 is wound around the outer tip 12a of the outer panel 12, and curl molding is started. Then, as shown in FIG. 7, the inner tip end portion 14a is curled to a predetermined molding range, whereby the edge portion 16 having a substantially circular cross section is wound. Although the edge part 16 is laminated | stacked at maximum 5 times in the height direction, for example, you may be laminated | stacked at maximum 4 times.

  Next, as shown in FIG. 8, a seam punch 30 having a seam forming portion 28 is used instead of the curl punch 26. The seam punch 30 moves in the direction of the arrow (downward) to perform seam forming while deforming the edge 16 having a substantially circular cross section into a flat shape. Thereby, as shown in FIG. 3, the edge part 16 which has a predetermined | prescribed cross-sectional shape is formed.

  The present invention is not limited to the above-described embodiment, and it is naturally possible to adopt various configurations without departing from the gist of the present invention.

  Of course, the method for forming a panel member according to the present invention can be applied to products other than automobiles.

  Furthermore, in the panel member molding method according to the present invention, the outer tip 12a of the outer panel 12 and the inner tip 14a of the inner panel 14 are curled to form a curled edge having a substantially circular cross section. . Next, only the portion outside the portion where the end portion of the outer panel 12 is positioned in the curled edge portion may be seam-formed and deformed flat.

DESCRIPTION OF SYMBOLS 10 ... Panel member 12 ... Outer panel 12a ... Outer front-end | tip part 12ae, 14ae ... Preliminary bending part 14 ... Inner panel 14a ... Inner front-end | tip part 16 ... Edge part 18 ... Parting line 20 ... Curl molding apparatus 22 ... Mounting stand 24 ... Curl molding part 26 ... Curl punch

Claims (3)

An outer member and an inner member are overlaid, and a method of forming a panel member having an edge portion in which an outer tip portion of the outer member and an inner tip portion of the inner member are fastened together by winding,
Along the parting line serving as the edge of the product shape, and facilities the bending in advance in the outer tip along the outer surface direction in which the outer tip worked flexural intersects the molding direction of the curl mold A process of extending into a flat plate shape ,
A step of superposing the inner member and the outer member in a state in which the inner tip portion is spaced inward from the outer tip portion;
And said and said outer tip inner tip, by curled molded to the parting line by the curling mold, a step of providing the edge that is fastened by seaming,
A method for forming a panel member, comprising: In the molding method of claim 1 Symbol placement,
Bending processed in the molding direction upstream side of the curl mold from the parting line in the outer tip molding method of the panel member, wherein a pre-bent portion is formed. The molding method according to claim 2,
Bending processed the outer tip, the maximum angle formed between the molding direction as viewed along the outer surface direction, characterized in that it is set in the 1 ° or less towards the formation planned direction of the edge Panel member forming method.

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