JPH0152090B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a press molding tool having a cam mechanism that forms a stepped flange portion on the peripheral edge of a workpiece, and is used to form various panels such as rear fenders of automobiles. It is used when manufacturing.

(Prior Art) For example, a stepped flange portion is formed on the peripheral edge of a rear fender of an automobile, and a press molding tool having a cam mechanism is used to form this type of flange portion. This press tool usually has a cam mechanism consisting of a driver cam fixed to the upper mold, and a flanging cam and a slide cam supported horizontally movably on a base, and the upper mold is lowered. A driver cam, which descends together with this, drives the flanging cam, etc., horizontally, for example, via its cam surface, thereby flanging the peripheral edge of the workpiece.

However, in the past, when a flange was formed, for example, on the peripheral edge of a rear fender of an automobile using a press molding tool as described above, the following problems occurred. That is, in an automobile rear fender A shown in FIG. 6, which has a corner portion B (a portion that should become a corner portion on the rear side of the vehicle body), the flange E side of the stepped portion D formed on the fender peripheral edge C. Since the circumferential lengths of the part and the part on the outer surface F side of the fender are different at the corner part B, that is, the former is shorter than the latter, the flange E having the stepped part D as shown in the figure During molding, a large number of wrinkles G...G occurred at the corner part B,
As a result, the quality of the molded product deteriorated.

(Object of the Invention) The present invention deals with the above-mentioned problem when forming a stepped flange portion on the peripheral edge of a workpiece, and is aimed at solving the problem of forming wrinkles on the peripheral edge of a corner portion of the workpiece. The purpose of the present invention is to provide a press molding tool capable of forming a flange on the periphery of the workpiece without any problems, and to make it possible to obtain a wrinkle-free, high-quality press-formed product having this type of flange. .

(Structure of the Invention) In order to achieve the above object, a press molding tool having a cam mechanism according to the present invention is characterized in that it is structured as follows.

That is, there is a slide cam that is supported horizontally movably with respect to a base, has a workpiece placement surface on its upper surface, and has a flange formed on its side surface, and a slide cam that is mounted on the slide cam in the same direction as the cam's movement. A flanging cam has a flange forming part that is supported so as to be relatively movable in the direction and forms a flange part on the peripheral edge of the workpiece with the flange forming part of the slide cam; In a configuration including a driver cam that moves the flanging cam horizontally in a direction closer to the peripheral edge and then similarly moves the flanging cam in the opposite direction to this moving direction, a wrinkle presser is provided in the slide cam facing the flanging cam. and supports the wrinkle presser so that it can move relative to the slide cam in the same direction as the moving direction of the flanging cam, and the wrinkle presser is always urged in the direction of the flanging cam by the elastic member. Make it. and,
A stopper is provided for this wrinkle presser to lock the wrinkle press when the flanging cam reaches the forward end. In the embodiment of the present invention to be described later, the stopper is provided on the slide cam so as to engage with an engagement recess formed in the wrinkle presser at the lock position of the wrinkle presser, and the stopper is provided on the wrinkle presser side by a spring. A stopper member that is always biased, and a return cam mechanism that allows the stopper member to escape from the engagement recess against the spring when the slide cam returns to its initial position.

The press die constructed in this manner forms a stepped flange portion on the peripheral edge of the workpiece in the following manner.

With a workpiece whose periphery has been formed in a predetermined shape in the previous process and which has corner parts set on the workpiece mounting surface of the slide cam, the driver cam is lowered to first move the slide cam in a predetermined horizontal direction. The cam is driven, and the predetermined surfaces of the flange forming part and the wrinkle presser in the cam come into contact with one side of the peripheral edge of the workpiece in a flush state and stop. Then, as the driver cam further descends from this state, the flange forming part of the flanging cam presses the peripheral edge of the workpiece from the other side, but at this time,
The above wrinkle holder, which is installed in the slide cam facing the flanging cam so as to be movable in the same direction as the flanging cam, is holding the corner of the peripheral edge of the workpiece between it and the flanging cam. Then, in response to the pressing force of the flanging cam, the wrinkle presser is moved in the same direction against the elastic member to the lock position of the wrinkle presser by the stopper member. As a result, the peripheral edge of the workpiece is bent approximately at right angles to form a stepped flange. In that case, at the corner part of the workpiece periphery,
To prevent wrinkles from forming, the end side of the peripheral edge is held between the flange forming part of the flanging cam and the wrinkle presser with a predetermined force determined by the biasing force of the elastic member, so during flange processing. This effectively prevents wrinkles from forming at the corner portions.

After forming the flange part on the peripheral edge of the workpiece as described above, the driver cam moves up and the wrinkle presser stops at the above-mentioned lock position, and then the flanging cam moves back and returns to its original position. After that, the slide cam similarly returns to the initial position, but at this time, the wrinkle presser is unlocked by the stopper, so the wrinkle presser is also automatically reset to the initial position by the elastic member. be done.

(Effects of the Invention) According to the above configuration, during the flange forming process on the peripheral edge of the work, the end side of the work at the corner portion of the peripheral edge is held between the flange forming part of the flanging cam and the wrinkle presser. Therefore, the occurrence of wrinkles at the corner portions is effectively prevented, and as a result, a high quality product without wrinkles at the corner portions can be obtained as a press-formed product having a stepped flange portion at the peripheral edge. become. In addition, in the above configuration, when the flanging cam retreats after flanging the peripheral edge of the workpiece, the wrinkle holder is locked by the stopper, so the wrinkle holder is pressed against the workpiece by the elastic member. Destruction of the workpiece portion, ie, destruction of the flange portion, due to movement toward the peripheral edge side is avoided.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

This embodiment relates to the case where a flange E having a step D is formed on the peripheral edge C of a rear fender A of an automobile as shown in FIG.

As shown in FIG. 1, the press die 1 is supported on a base 2 so as to be horizontally movable in the left and right directions (directions of arrows a and a') in the drawing, and is constantly biased in the direction a by a spring 3. a slide cam 4 supported on the slide cam 4 and a
It is relatively movable in the a' direction and is moved by the spring 5.
A flanging cam 6 that is constantly biased in the a′ direction,
It has a cam mechanism consisting of a driver cam 8 which is fixed to the lower surface of an upper mold 7 provided above these cams 4 and 6 and which moves up and down integrally with the upper mold. Here, a first plate holder 11 is suspended below the upper mold 7 and is movable up and down relative to the upper mold 7 via a guide shaft 9 and is biased downward by a spring 10. It is set up in a shape.

The slide cam 4 is located on one side (in the drawing,
The upper surface (on the left) is the mounting surface 4a of the workpiece X, and the side surface 4b continuous therewith is the peripheral edge of the workpiece
It is a flange molded part 4b for _X1 , and the other side of the cam 4 (right side in the drawing)
A cam surface 4d corresponding to the first cam surface 8a formed in an inclined shape at the lower end of the driver cam 8 is formed at the upper end of the upright portion 4c. Then, the driver cam 8 that descends together with the upper die 7 presses the cam surface 4d of the slide cam 4 via the first cam surface 8a, thereby driving the slide cam 4 in the direction a'. The workpiece mounting surface 4a and the flange forming portion 4b of No. 4 move along one side (inner surface) of the workpiece X to a position where they come into contact with each other.

On the other hand, in the flanging cam 6, a flange forming part 6b is formed at the upper left side of the cam body 6a in the drawing, and forms a flange part on the peripheral edge _X1 of the workpiece X together with the flange part 4b. In addition, the upper surface on the right side of the cam body 6a is a cam surface 6c corresponding to the second cam surface 8b formed in an inclined shape at the lower end of the driver cam 8, and the upper surface on the left side of the main body 6a is a cam surface 6c. A second plate holder 12 is provided so as to be movable relative to the flanging cam main body 6a in the same direction as the direction of movement (a, a' direction) of the flanging cam main body 6a. Then, after the slide cam 4 is driven in the a' direction by the lowering of the driver cam 8 as described above, the flanging cam 6 is similarly driven in the a direction, thereby machining the workpiece X. The main body 6a of the cam and the second plate holder 1 until the starting position (the position shown by the chain line in FIG. 4)
2 move forward integrally, and the second plate presser 12 pinches the peripheral edge part _X1 of the workpiece between it and the flange forming part 4b of the slide cam 4, and in this state, the cam body 6a
Only that part is configured to move further in the direction a. The second plate holder 12 is constantly urged in the direction a via the piston shaft 13a by a nitrogen gas-filled cylinder 13 provided on the flanging cam body 6a.

A wrinkle presser 14 is provided below the workpiece mounting surface 4a and the flange forming part 4b of the slide cam 4, facing the flange forming part 6b of the flange cam 6. This wrinkle presser 14 is supported within the slide cam 4 so as to be movable relative to the slide cam 4 in the same direction as the moving direction of the cam 4 or the flanging cam 6, and is interposed between it and the slide cam 4. installed spring 1
5...15 is constantly biased in the direction of the flanging cam 6 (direction a'), and at the end of movement of the wrinkle presser 14 in the direction a', the right side surface 14a of the wrinkle presser 14 is aligned with the slide cam 4 in the drawing. It is regulated by a stopper bolt 16 so as to be flush with the right side surface of the flange molded portion 4b.

Furthermore, the wrinkle presser 1 in the slide cam 4 is
A stopper 17 is provided at the lower part of the wrinkle presser 14 to lock the wrinkle presser 14 when the flanging cam 6 reaches the forward end in the direction a. In this embodiment, as shown enlarged in FIGS. 2 and 3, this stopper is configured to engage with an engaging uneven portion 14b formed on the lower surface of the wrinkle presser 14 at the locked position of the wrinkle presser 14. The stopper member 19 is urged toward the wrinkle presser 14 by the spring 18, and when the slide cam 4 moves in the direction a in FIG. and a return cam mechanism 20 for removing the stopper member 19 from the recess 14b. Here, the return cam mechanism 20 is formed on a rail portion 21 fixed to the base 2 to have a predetermined width and extend in the left-right direction in the drawing, and has a cam surface 22a having an inclined left end. long hole part 22
and a conical cam 19a corresponding to the cam surface 22a provided at the lower end of the stopper member 19 so as to be located within the elongated hole portion 22. As shown by the chain line in FIG. 2, the conical cam 19a moves along the cam surface 22a in the elongated hole 22, thereby releasing the engagement between the recess 14b and the stopper member 19. There is.

Next, the operation of this embodiment will be explained.

With the workpiece X, whose peripheral edge _X1 has been bent into a predetermined shape, set on the workpiece placement surface 4a of the slide cam 4, the driver cam 8 is lowered integrally with the upper die 7; First, the first cam 8
The cam surface 8a presses the cam surface 4d of the slide cam 4. Therefore, the slide cam 4 is driven in the direction a' from the state shown in FIG.
slides to a predetermined contact position along one side (inner surface) of the workpiece X. At this time, the first plate holder 11 provided below the upper mold 7 descends together with the upper mold 7 to press the workpiece X from the upper surface side in the drawing. As a result, the workpiece X is held and fixed between the slide cam 4 and the first plate holder 11, as shown in FIG.

Then, with the workpiece X fixed at a predetermined position in this manner, the upper die 7 and the driver cam 8 are further lowered, but in that case, the cam surface 6c of the flanging cam 6 is the second one of the driver cam 8. By being pressed by the cam surface 8b,
The flanging cam 6 moves in the direction a, and the fourth
As shown by the chain line in the figure, first, the flange forming part 6b of the cam 6 and one end surface (the left side in the drawing) of the second plate holder 12 contact the outer surface side of the workpiece peripheral edge _X1 in a flush state. .

From this state, the flanging cam 6 is further driven forward in the direction a by the lowering of the driver cam 8, but in that case, the second plate holder 1
2 is movable relative to the main body 6a of the flanging cam 6, so when the peripheral edge of the workpiece _X1 is held between it and the flange forming part 4b of the slide cam 4, Movement in the a direction is prevented. On the other hand, the peripheral edge of the workpiece is
The wrinkle presser 14 holding X ₁ is supported so as to be movable relative to the slide cam 4 in directions a and a', and is always urged toward the flanging cam 6 by springs 15...15. . Therefore, when the flanging cam 6 moves forward in the direction a as described above, the second presser foot 12 presses the relatively inner part of the workpiece periphery X and is fixed at the contact position, while the flanging cam With the main body 6a sandwiching the outer (end side) portion of the workpiece peripheral edge _X1 between the flange forming part 6b and the wrinkle presser 14, press the wrinkle presser 14 a against the springs 15...15. Move forward while pushing in the direction. and,
When the flanging cam body 6a reaches the forward end, the wrinkle presser 1 is pressed as shown in FIGS. 2 and 5.
The wrinkle presser 14 is locked by the stopper member 19 engaging with the engagement recess 14b at 4 from below. As a result, a flange _X3 with a step _X2 is formed on the peripheral edge _X1 of the workpiece X, as shown in FIG. In this case, the end portion of the workpiece peripheral edge _X1 , particularly the corner portion (corresponding to the portion indicated by the symbol B in FIG. 6), is connected to the wrinkle presser 14 and the flange of the flanging cam 6 as described above. Since the stepped portion X ₂ and the flange X ₃ are molded while being held between the molded portion 6b, wrinkles that are likely to occur at the corner portions of the molded portion (rear fender) during this type of flange processing (Fig. 6). ) will be effectively prevented.

Furthermore, after the flange X ₃ is formed on the workpiece periphery X ₁ as described above, as the upper die 7 and driver cam 8 rise, the flanging cam 6 and the slide cam 4 are attached to the spring 5 and the spring 3. Yotsutte 5th
The conical cam 1 in the stopper member 19 provided at the lower part of the slide cam 4 is returned from the position shown in the figure in the directions a' and a, respectively.
By moving 9a in the direction a along the cam surface 22a in the elongated hole 22 of the rail portion 21,
As shown by the chain line in FIG. 2, the stopper member 19 is pushed down against the spring 18. As a result, the upper part of the stopper member 19 escapes from the engagement recess 14b of the wrinkle presser 14, and the engagement between the two is released. As a result, the wrinkle presser 14
5...15, it is returned to the initial position shown in FIG.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a partially longitudinal side view showing the overall configuration of a press mold according to the embodiment, and FIG. 2 is a state in which the wrinkle presser is locked. Fig. 3 is a plan view taken along the line of Fig. 2 and shows the area around the elongated hole, and Fig. 4 shows the state immediately after the slide cam has been moved by the driver cam. FIG. 5 is a front view similar to FIG. 1 showing the state in which flange processing has been performed. Further, FIG. 6 is a perspective view of a main part of a press-formed product (a rear fender of an automobile) used to explain the conventional problems and the above-mentioned embodiment. DESCRIPTION OF SYMBOLS 1...Press mold tool, 2...Base, 4...Slide cam, 4a...Work placement surface, 4b...Flange forming part, 6...Flanging cam, 6b...Flange forming part, 8... ...Driver cam, 14...
Wrinkle presser, 14b... Engaging recess, 15... Elastic member (spring), 17... Stopper, 18... Spring,
19... Stopper member, 20... Return cam mechanism, W... Workpiece, W ₁ ... Workpiece periphery, X ₂ ,
X ₃ ... flange part (X ₂ ... step part, X ₃ ... flange).

Claims (1)

[Scope of Claims] 1. A press molding tool having a cam mechanism that forms a stepped flange portion on the peripheral edge of a workpiece, which is supported so as to be horizontally movable with respect to a base and on which the workpiece is placed. A slide cam having a mounting surface and a flange molded portion on a side surface, and a slide cam supported on the slide cam so as to be movable relative to the cam in the same direction as the movement direction of the cam, and a flange molded on the slide cam. and a flanging cam having a flange forming part for forming a flange part on the peripheral edge of the workpiece, and after horizontally moving the slide cam by lowering in a direction in which the flange forming part approaches the peripheral edge of the workpiece, A driver cam that also moves the flanging cam in the opposite direction to the movement direction, and a driver cam that is provided in the slide cam facing the flanging cam and moves relative to the slide cam in the same direction as the movement direction of the flanging cam. The wrinkle presser is provided with a wrinkle presser that is supported by the wrinkle presser and that is always urged in the direction of the flanging cam by an elastic member, and a stopper that locks the wrinkle presser when the flanging cam reaches the forward end with respect to the wrinkle presser. A press mold tool having a cam mechanism characterized in that: 2. The stopper includes a stopper member that is provided on a slide cam and is constantly biased toward the wrinkle presser by a spring so as to engage an engagement recess formed in the wrinkle presser at the lock position of the wrinkle presser, and a stopper member that is always biased toward the wrinkle presser by a spring, and the slider. 2. A press die having a cam mechanism according to claim 1, comprising a return cam mechanism that causes the stopper member to escape from the engagement recess against the spring when the cam returns to its original position.