JP2006175460A - Press forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press forming apparatus which can carry out a press bending process for forming a workpiece into an almost bag shape by one press work. <P>SOLUTION: The press forming apparatus comprises a bag shape forming portion 12 of a guide cam which has a projected forming shape corresponding to a tapered-off bag shape portion 9 to be formed in the workpiece 1, and is arranged above a rotary shaft 21 rotatably supported so as to be off-set, and a driving means 13 for turning the rotary shaft 21 provided with the bag shape forming portion 12 of the guide cam. In the press work, the bag shape forming portion 12 is positioned at a specified position for forming the bag shape portion 9 in the workpiece 1, and the tapered-off bag shape portion 9 is formed in the workpiece 1 by bringing a forming cam into contact with the bag shape forming portion 12. After the press work, the bag shape forming portion 12 is withdrawn by turning the rotary shaft 21 by means of the driving means 13 so as not to interfere with the tapered-off bag shape portion 9 of the workpiece 1. By this operation, the press bending process for forming the workpiece into the almost bag shape can be carried out by one the press work. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press molding apparatus that forms a bag-like portion on a workpiece.

  For example, a metal plate such as an automobile body is formed by pressing with a lower fixed mold and an upper movable mold in the vertical direction. When a negative angle is formed so that the side surface of the workpiece is inserted into the inside of the workpiece mounting surface with respect to the pressing direction, a rotary cam structure is used as described in JP-A-2003-31347. The thing provided is used, or the thing provided with the double cam structure as described in Unexamined-Japanese-Patent No. 11-347654 is used.

Moreover, in the lamp | ramp top part 3 (refer FIG. 5) of a motor vehicle, the site | part which forms a hood flange and the site | part which forms a fender flange are adjoining three-dimensionally. As for the molding of the lamp top portion of such an automobile, for example, a processing apparatus proposed in Japanese Utility Model Publication No. 4-42013 is known.
JP 2003-31347 A JP-A-11-347654 No. 4-42013

  A front fender panel 1 on which a lamp top portion of an automobile is formed has a shape as shown in FIG. 6 as a whole, for example, with the side panel side facing up. In FIG. 6, 2 is a side panel part, 3 is a lamp top part, 4 is a hood part that continues to the bonnet side, and 5 is a lamp installation part for installing a headlamp.

  The hood part 4 is curved substantially perpendicularly from the surface of the side panel part 2, and a flange 6 bent at the inner side of the workpiece is formed at the lower end thereof. Although not shown, the flange 6 is formed with an attachment hole for attaching the front fender panel 1 to the front fender apron. Further, a flange 8 provided with a step 7 is formed on the lamp installation portion 5 side in order to install a headlamp. Moreover, as shown in FIG. 7 which shows an AA end surface, the lamp | ramp top part 3 continues smoothly from each of the food | hood part 4 side and the lamp installation part 5 side, as shown in FIG. 8 which shows a BB end surface. Furthermore, it has a shape that is thinly curved toward the tip. As shown in FIG. 9, the tip of the lamp top part 3 is formed in a tapered bag-like part 9 surrounded by a flange 6 on the hood part 4 side and a flange 8 on the lamp installation part 5 side.

  The flange 6 on the hood portion 4 side is bent so as to enter the inner side of the surface on which the workpiece is placed with respect to the abutting direction of the upper die, and is formed at a so-called negative angle.

  In general, when a negative angle portion is formed on a workpiece, a rotary cam structure or a double cam structure as described in Patent Documents 1 and 2 is adopted. Since it is narrowed in a bag shape toward the tip, there is no space for arranging the rotary cam. Further, even when the double cam structure is used, as shown in FIG. 10, if the processing cams are simultaneously brought into contact with each other from a plurality of directions to form the flange 6 on the hood portion 4 side and the flange 8 on the lamp installation portion 5 side, Since the cam A is surrounded by the workpiece, the workpiece cannot be removed from the guide cam A.

  For this reason, conventionally, in the press molding of the front fender panel, the process of forming the flange 6 on the hood part 4 side and the process of forming the flange 8 on the lamp installation part 5 side are separated, and the guide cam is located on either side. It was necessary to form so as to come off. For this reason, it is necessary to press at least two times for the curve processing of the lamp top portion 3.

  In the molding of automobile bodies, three processes of drawing, drawing the outer periphery, and bending are being promoted in order to improve work efficiency and reduce costs. However, when there is a part where the workpiece is bent in a substantially bag shape like the lamp top part 3 of the front fender, the number of steps of the bending process of such a part increases, so that three processes can be realized. In addition, four or five processing steps are required. Moreover, in order to implement | achieve 3 process formation, it was necessary to restrict | limit a design.

  The press molding apparatus according to the present invention has a protruding cam shape corresponding to a tapered bag-shaped portion formed on a workpiece, and is a guide cam bag provided by being offset at the upper portion of a rotating shaft that is pivotally supported. And a driving means for rotating the rotation shaft provided with the bag-shaped forming portion of the guide cam, and positioning the bag-shaped forming portion at a predetermined position for forming the bag-shaped portion on the workpiece during processing, The processing cam is brought into contact with the bag-shaped forming portion to form a tapered bag-shaped portion on the workpiece. After the processing, the rotation shaft is rotated by the driving means, and the bag-shaped forming portion is turned into the tapered bag-shaped portion of the workpiece. It is characterized by retreating so as not to interfere with.

  According to this press molding apparatus, even when a plurality of processing cams are simultaneously brought into contact with the bag-shaped forming portion of the guide cam, the bag-shaped forming portion of the guide cam is prevented from interfering with the site where the workpiece is molded into the bag shape. Can be rotated and retracted. Thus, by simultaneously abutting a plurality of processing cams with the bag-shaped forming portion of the guide cam and forming the bag-shaped portion on the workpiece, the number of processing steps of the bending process for the bag-shaped forming portion can be reduced, The work efficiency can be improved and the cost can be reduced.

  Hereinafter, a press forming apparatus according to an embodiment of the present invention will be described with reference to an example of a bending process of a lamp top portion of a front fender panel of an automobile. In addition, about each site | part of the front fender panel 1, the code | symbol used in FIG. 6 mentioned above is attached | subjected and demonstrated.

  As shown in FIG. 1, a guide cam 10 installed in a lower mold of a press molding apparatus for a portion forming a lamp top portion 3 of a front fender panel 1 of an automobile, as shown in FIG. A unit 12 and a driving means 13 are provided. For convenience of explanation, FIG. 1 shows the position of the front fender panel 1 during processing by dotted lines.

  The hood side surface forming part 11 forms the flange 6 formed on the side surface of the hood part 4 and the hood part 4 of the front fender panel 1, and the side surface 11 a on the hood part side extends from the hood part 4 to the lamp top part 3. The shape according to the shaping | molding shape of the food | hood part 4 is provided over the front-end | tip. The lamp installation part 5 side also includes a molding surface 11b that forms a flange for lamp installation on the upper surface. In addition, since the lamp top tip forming portion 12 is disposed on the lamp top portion 3 side of the hood side surface forming portion 11 so as to be continuously rotatable to the hood side surface forming portion 11, a depression along the rotation arc is provided. 11c.

  The lamp top tip forming portion 12 is a bag-like forming portion of the guide cam 10 that forms a tapered bag-like portion 9 formed at the tip of the lamp top portion 3, and is attached to the recess 11 c of the hood side surface forming portion 11. Yes. The tip portion 12 a of the lamp top tip forming portion 12 is continuous with the side surface 11 a on the hood portion 4 side of the hood side surface forming portion 11, and has a protruding shape corresponding to the tapered bag-like portion 9 formed at the tip of the lamp top portion 3. It has a molded shape. Further, the upper surface is provided with a molding surface 12b that is continuous with the molding surface 11b that forms a flange for forming a lamp for lamp installation of the hood side surface forming portion.

  The lamp top tip forming portion 12 is attached to the upper portion of the rotating shaft 21 while being offset via the installation base 21a. The rotation shaft 21 to which the lamp top tip forming portion 12 is attached is configured to form a continuous shape with the hood side surface forming portion 11 when the workpiece is processed on the tip side of the lamp top portion 3 of the hood side surface forming portion 11. Further, it is pivotally supported so that it can be rotated by driving means 13 described later.

  The lamp top tip forming portion 12 needs to be rotated and retracted so as not to interfere with the tapered bag-like portion formed on the workpiece after the workpiece has been processed. In order to realize the moving and retracting operation, the installation position of the rotating shaft 21, the angle of the rotating shaft 21, and the offset amount of the lamp top tip forming portion 12 may be adjusted.

  Further, in this embodiment, a double cam structure is formed and the flange 6 is formed at a negative angle in the lower portion on the hood portion 4 side in cooperation with the processing cam. Therefore, the hood side surface forming portion 11 and the lamp top tip forming portion 12 are provided. Each of them is installed on a base cam 23 that is slidably movable with respect to the lower mold, and as shown in FIG. I support. The base cam 23 engages with a fixed cam 24 installed on the upper mold, and moves the hood side surface forming portion 11 and the lamp top tip forming portion 12 to a predetermined processing position for forming the hood portion during processing (FIG. 1). (See Fig. 4).

  The driving means 13 is for rotating the rotation shaft 21 of the lamp top tip forming portion 12. In this embodiment, a hydraulic pressure as an actuator is provided on an operation arm 24 projecting radially from the rotation shaft 21. A cylinder 25 is attached, and the rotating shaft 21 is rotated by the expansion and contraction of the hydraulic cylinder 25. The hydraulic cylinder 25 is installed on the base cam 23 in the same manner as the lamp top tip forming portion 12. In this embodiment, a lock mechanism for locking the rotation of the rotation shaft 21 at the position of the lamp top tip forming portion 12 at the time of processing shown in FIG. 1 is provided. Note that the driving unit 13 is not limited to this. For example, although not illustrated, the rotating shaft 21 may be rotated by a cam mechanism following the up / down movement of the upper mold. .

  Below, the process of shape | molding the tapered bag-shaped part 9 at the front-end | tip of the lamp | ramp top part 3 of a workpiece | work is demonstrated.

  First, the lamp top tip forming portion 12 is rotated by the driving means 13, and as shown in FIG. 1, the tip end portion of the lamp top portion 3 continues to the tip side of the lamp top portion 3 of the hood side surface forming portion 11. The rotating shaft 21 is fixed by a lock mechanism (not shown).

  Next, the upper die is lowered and press working is performed. At this time, as shown in FIG. 2, the base cam 23 is moved to the left side in the drawing by the cam mechanism formed between the lamp top portion 3 and the fixed cam 31 installed on the upper die. The machining cam 22 moves to the right in the drawing, and the lamp top tip forming portion 12 and the machining cam 22 abut each other to form a negative-angle flange 6 on the side surface on the hood side. Further, another processing cam collides with the front end side of the lamp top portion 3, and the workpiece is bent along the lower side of the lamp top front end forming portion 12, and is continued to the flange 6 formed on the hood side. Form a negative angle flange. In addition, the bent blade 32 installed on the upper die abuts on the side surface of the hood side surface forming portion 11 and the lamp top tip forming portion 12 on the lamp setting portion 5 side to form the flange 8 having the step 7. .

  As a result, a bag-shaped portion 9 surrounded by a flange 6 formed on the side surface on the hood side and a flange 8 formed on the side surface on the lamp installation side at the tip of the lamp top portion 3 and narrowing toward the tip is formed. Is formed (see FIG. 9).

  As shown in FIG. 3, when the workpiece is removed from the mold, the driving means 13 rotates the rotation shaft 21 counterclockwise so that the tip of the lamp top tip forming portion 12 is formed on the workpiece. Retract from the tip of the tapered bag-shaped lamp top 3. Next, as shown in FIG. 4, in this state, the base cam 23 slides inside the work. At this time, since the workpiece has a shape that gradually rises from the tip of the lamp top portion 3 toward the base end side of the lamp top portion 3, the lamp top tip forming portion 12 is used as the lamp installation portion of the lamp top portion 3. The lamp top portion 3 can be pulled out without being caught by the flange 8 formed on the side 5.

  According to this press molding apparatus, the lamp top tip forming portion 12 is not interfered with the workpiece in the step of forming the tapered bag-like portion on the workpiece, such as the tip of the lamp top portion 3 of the front fender panel 1 described above. And can be removed from the tip of the tapered bag-like portion 9 of the workpiece. Further, the rotation axis of the lamp top tip forming portion 12 is pivotally supported by a base cam 21 that slides relative to the lower mold, and works with the machining cam 22 that moves in accordance with the lifting movement of the upper mold. Since a negative angle is formed, a flange having a negative angle continuous from the tip can be formed on one side of the tapered bag-like portion. Thereby, the bending process of the bag-like part 9 can be formed by a single press process.

  As mentioned above, although the press molding apparatus which concerns on one Embodiment of this invention was demonstrated, the press molding apparatus which concerns on this invention is not limited to said embodiment.

  For example, as described above, the part where the ultrafine bag-like part is formed on the workpiece is not limited to the tip of the lamp top part of the front fender panel of an automobile, but includes the rear combination lamp part of a quarter panel, and the like. The press molding apparatus can be applied to various parts for molding a tapered bag-like portion in the same manner as these.

  In the above-described embodiment, a negative angle flange is formed continuously with the flange 6 formed on the hood side, so that the rotation shaft 21 of the lamp top tip forming portion 12 as a bag-shaped forming portion is pivotally supported by the base cam 23. However, the hood side surface forming portion 11 moves with respect to the lower mold. However, in the portion where only the tapered bag-shaped portion is formed, the rotation shaft of the bag-shaped forming portion is not necessarily installed on the base cam. .

The top view which shows the guide cam of the press molding apparatus which concerns on one Embodiment of this invention. Longitudinal section showing guide cam installation structure The top view which shows the state which the lamp | tip top front-end | tip formation part rotated. The top view which shows the state which slid the guide cam inside the workpiece | work. The figure which shows the lamp | ramp top part of a motor vehicle. The top view which shows a front fender panel. The AA end elevation of FIG. 6 which shows the front-end | tip shape of a lamp top part. The BB end elevation of Drawing 6 showing the tip shape of a lamp top part. The perspective view which shows the front-end | tip shape of a lamp top part. Sectional drawing which shows the problem of the conventional press molding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front fender panel 3 Lamp top part 4 Hood part 5 Lamp installation part 6 Flange 7 Level difference 8 Flange 9 Bag-shaped part 10 Guide cam 11 Hood side surface formation part 12 Lamp top tip formation part (bag-shaped formation part)
12a Front end portion of ramp top front end forming portion 13 Driving means 21 Rotating shaft 22 Processing cam 23 Base cam 24 Fixed cam 24 Operation arm 25 Hydraulic cylinder

Claims (3)

A guide cam installed on the lower mold and having a shape corresponding to the molded shape;
A machining cam that moves following the lifting movement of the upper mold,
In a press molding apparatus that abuts a processing cam with a guide cam by an operation in which the upper mold collides with a lower mold, and molds a workpiece placed on the guide cam into a predetermined shape,
A guide-shaped bag-shaped forming portion provided with a projecting shape corresponding to the tapered bag-shaped portion formed on the workpiece, and offset by a rotating shaft pivotally supported;
Driving means for rotating a rotation shaft provided with the bag-shaped forming portion of the guide cam;
The bag-shaped forming portion is positioned at a predetermined position where a bag-shaped portion is formed on the work during processing, and the processing cam is brought into contact with the bag-shaped forming portion of the guide cam to form a tapered bag-shaped portion on the work. ,
A press molding apparatus characterized in that after the processing, the rotary shaft is rotated by the driving means to retract the bag-shaped forming portion so as not to interfere with the tapered bag-shaped portion of the workpiece.   The workpiece is formed with a negative angle continuously on one side of the bag-shaped portion, and the rotation shaft provided with the bag-shaped forming portion is driven by the lifting and lowering operation of the upper mold to form the lower mold. In contrast, the bag-shaped forming portion of the guide cam is pivotally supported by a base cam that slides, and cooperates with a processing cam that moves in accordance with the up-and-down movement of the upper die to form a negative angle portion on the workpiece. The press molding apparatus according to claim 1.   When forming the substantially bag-shaped portion of the workpiece, in one press process, a plurality of processing cams collide with the bag-shaped forming portion of the guide cam from a predetermined direction with respect to the bag-shaped forming portion. The press molding apparatus according to claim 1, wherein a bag-like portion is formed on the workpiece.

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