JP4505816B2 - Press forming equipment - Google Patents

Description

  The present invention relates to a press molding apparatus provided with a rotary cam and a double cam for pressing metal panel parts for automobiles, and more particularly to a rotary cam locking apparatus.

Conventionally, for example, when molding a metal panel P of an automobile as shown in FIG. 9, the press molding apparatus 1 is configured to include a rotary cam 2 and a double cam 3 as shown in FIG. 10. Here, the rotary cam 2 is configured so as to form the region indicated by symbol A in FIG. 9 of the metal panel P, and after the molding, the curved shape is released by the rotational motion when the panel is conveyed.
In addition, the double cam 3 forms the region indicated by the symbol B in FIG. 9 of the metal panel P, and after the molding, the curved shape is similarly released by the longitudinal movement indicated by the arrow C when the panel is conveyed. It is configured.

  As shown in FIG. 11, the rotary cam 2 is a backup punch in which a cylindrical rotor 2b is rotatably arranged with respect to a holder 2a, and a part of the outer peripheral surface of the rotor 2b is fixed to the holder 2a. It is pivotally supported by 2c. The rotor 2b includes a notch 2d having two surfaces that are substantially orthogonal to each other in the vicinity of the center axis thereof, and a guide plate 2e is fixed to one surface of the notch 2d, and the other surface. The molding part 2f is formed in the.

  According to the press molding apparatus 1 having such a configuration, after a plate material as a workpiece is carried into the press molding apparatus 1, molding is performed by the rotary cam 2 and the double cam 3, and then the rotor 2b of the rotary cam 2 is rotated. The molding part 2f is retracted from the molding surface of the workpiece, and similarly, the double cam 3 is retracted from the molding surface of the workpiece by the back-and-forth movement, whereby the press-molded plate material is unloaded from the press molding apparatus 1 and Press forming is completed.

  By the way, according to the press forming apparatus 1 having such a configuration, as shown in FIG. 12, the rotor 2 b has a part of the double cam 3 in the bending direction D at the axial end adjacent to the double cam 3. A double cam receiving surface 2g is provided. Thereby, the double cam 3 is positioned with respect to the rotor 2b of the rotary cam 2 when the workpiece is curved.

  However, as described above, the rotor 2b and the double cam 3 of the rotary cam 2 are positioned only on the mating surfaces. Therefore, when a press pressure is applied in the curve processing direction D during the curve processing, this press is performed. The double cam 3 is rolled in the direction of arrow E by the pressure, and a step is generated on the mating surface of the rotor 2 b of the rotary cam 2 and the double cam 3. For this reason, the joint line of the boundary line of the rotary cam 2 and the double cam 3 will be formed in the press-molded work, and the moldability of the press-processed product will be impaired. Further, since the seam trace has a large variation, the molding stability of the pressed product is lowered.

On the other hand, Patent Document 1 discloses a press molding apparatus that includes a plurality of adjacent rotary cams and in which backup punches of the adjacent rotary cams are connected to each other by a connecting member. According to this press molding apparatus, since the backup punch of each rotary cam is connected to the backup punch of the adjacent rotary cam by the connecting member, the displacement of the rotor of the adjacent rotary cam and the displacement of the molding portion are reduced. The deviation of the rotor molding portion between adjacent rotary cams is reduced. In this way, the joint marks between the rotary cams are reduced, and the formability of the press-formed product is improved.
Japanese Patent Laid-Open No. 10-202321

However, in the press molding apparatus according to Patent Document 1, since the backup punches of the adjacent rotary cams are connected to each other by the connecting member, the rotors of the adjacent rotary cams are not directly connected and thus adjacent to each other. It is difficult to sufficiently reduce the deviation between the rotors.
Moreover, in patent document 1, when a rotary cam and a double cam adjoin, since a double cam is not provided with the backup punch, formation of the joint mark by the level | step difference between a rotary cam and a double cam cannot be reduced.

  The present invention has been created in view of such circumstances, and is a press molding device that reduces the formation of seams caused by steps generated by the bending processing pressure between adjacent rotary cams and double cams. It is intended to provide.

In order to achieve the above object, the present invention includes a rotary cam and a double cam adjacent to the rotary cam, a cylindrical rotor is rotatably disposed around the central axis of the rotary cam holder, and the backup is fixed to the holder. A press molding apparatus in which a part of the outer peripheral surface of a rotor is pivotally supported by a punch, and a rotor of a rotary cam projects axially outward from an end surface facing the double cam and fits into an engagement hole provided in an adjacent double cam. A fixed pin provided in the rotor so as to be slidable, a biasing member that pulls the fixed pin inward in the axial direction so as to be pulled into the rotor, and a moving mechanism that moves the fixed pin outward in the axial direction. Yes.
In the press molding apparatus according to the present invention, preferably, the urging member is a tension spring.

  The moving mechanism includes a shaft pin implanted in the fixed pin, a link plate engaged with the shaft pin, a guide block that moves in the radial direction of the rotor so as to push the link plate, and the guide block. A driver pin that moves in the backup punch substantially perpendicular to the surface of the holder so as to push radially inward of the rotor, that is, along the surface of the holder.

  Further, the driver pin may protrude from the backup punch in the pressing direction and may be disposed so as to be pushed in by a pad during press molding.

  According to the above configuration, when the workpiece is press-molded, the moving pin moves the fixing pin axially outward from the rotor toward the double cam against the biasing force of the biasing member, preferably the tension spring. . Thereby, the front-end | tip of the said fixing pin protrudes from the end surface which opposes the double cam of a rotor, and fits in the engagement hole provided in the adjacent double cam.

  Therefore, since the double cam is securely fixed to the rotary cam rotor with respect to the bending direction by the fixing pin, a pressing pressure is applied in the bending direction in the bending process by press molding. Sometimes the double cam is not beaten by this press pressure. In this way, there is no step at the boundary between the rotary cam and the double cam, so there is no formation of a joint between the rotary cam and the double cam on the molding surface of the workpiece, and the moldability of the press molded product is improved. As well as improving molding stability.

  According to the present invention, the fixed pin is disposed in the rotor of the rotary cam so as to be movable in the axial direction, and when the press molding is performed, the fixed pin protrudes outward in the axial direction and is provided on the adjacent double cam side. By fitting into the engagement hole, the rotor and the double cam of the rotary cam are securely fixed to each other in the direction perpendicular to the axial direction. As a result, even if a press pressure is applied in the bending direction during press molding, the double cam is not squeezed against the rotor of the rotary cam, so there is no step near the boundary between the rotary cam and the double cam. No seam marks are formed on the press-formed product due to the steps. Therefore, in press molding using a rotary cam and a double cam, these seams are not formed on the press-molded product, so that the moldability of the press-molded product is improved and the molding stability is also improved.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
FIG.1 and FIG.2 has shown the structure of one Embodiment of the press molding apparatus by this invention. The press molding apparatus 10 according to the embodiment of the present invention is configured in the same manner as the press molding apparatus 1 of FIG. 10 and has a rotary cam and a double cam. FIG. 1 shows the configuration of the rotary cam 20 in the press molding apparatus 10.

  As shown in FIGS. 1 and 2, the rotary cam 20 has a columnar rotor 22 rotatably arranged with respect to the holder 21, and a part of the outer peripheral surface of the rotor 22 is fixed to the holder 21. It is pivotally supported by a backup punch 23. Further, as shown in detail in FIG. 3, the rotor 22 includes a notch portion 24 having two surfaces that are substantially orthogonal to each other in the vicinity of the central axis, and a guide plate 25 is provided on one surface of the notch portion 24. The molding part 26 is formed on the other surface while being fixed.

The above configuration is the same as the rotary cam 2 in the conventional press molding apparatus 1 shown in FIG. 10, but the rotary cam 20 according to the embodiment of the present invention is different in that it further includes a lock device 30. ing.
As shown in FIGS. 3 and 4, the lock device 30 includes a fixing pin 31, a tension spring 32 as an urging member, a shaft pin 33 as a moving mechanism, a link plate 34, a guide block 35, and a driver pin 36. And is composed of.

  As shown in FIG. 4, the fixing pin 31 has, for example, a circular cross section extending in parallel with the central axis of the rotor 22, so that one end thereof can protrude outward in the axial direction from the end face on the double cam side of the rotor 22. The rotor 22 is supported so as to be slidable in the axial direction. An engagement hole for receiving the fixing pin 31 is provided on the end surface on the double cam side corresponding to the protruding position of the fixing pin 31 on the end surface on the double cam side of the rotor 22.

  One end of the tension spring 32 is fixed to the inner end in the axial direction of the fixing pin 31, and the other end is fixed to the rotor 22. Accordingly, the tension spring 32 biases the fixing pin 31 toward the inner side in the axial direction (rightward in FIG. 4). Further, the tension spring 32 is accommodated in a recessed portion 22 a provided on the side surface of the rotor 22 so as not to hinder the rotation of the rotor 22.

  The shaft pin 33 is implanted in the vicinity of the inner end of the fixed pin 31 in the axial direction, and moves in the axial direction in the recessed portion 22a as the fixed pin 31 moves in the axial direction.

  As shown in FIGS. 5 and 6, the link plate 34 is accommodated in a notch groove 22 b provided adjacent to the recessed portion 22 a of the rotor 22, and one end of the link plate 34 is swingably attached to the shaft pin 33. ing. As shown in FIG. 7, the notch groove 22 b is formed so that the recessed portion 22 a side extends obliquely outward in the axial direction and the recessed portion 22 a side becomes wider with respect to the circumferential direction of the rotor 22.

  As a result, the link plate 34 is pushed in the circumferential direction of the rotor 22 (upward as indicated by symbol F in FIG. 6) from the state in which the fixing pin 31 is urged inward in the axial direction by the tension spring 32. When moved, the link plate 34 moves upward while turning counterclockwise in the cutout groove 22b. Therefore, as the link plate 34 pivots, the shaft pin 33 and the fixed pin 31 are moved outward in the axial direction, as indicated by symbol G in FIG.

  As shown in FIGS. 2, 3 and 5, the guide block 35 is sandwiched by the backup punch 23 so as to be movable along the surface of the holder 21 toward the substantially central axis of the rotor 22. Means, in the case of illustration, is biased in a direction away from the rotor 22 by a nitrogen gas cylinder 35a. Thus, the guide block 35 is held at a position completely retracted from the rotor 22 by the nitrogen gas cylinder 35a.

  Further, the guide block 35 is formed such that the front end and the rear end thereof have slopes 35b and 35c on the upper surface, respectively. The slope 35b at the front end moves the link plate 34 in the direction of the central axis of the rotor 22 when the guide block 35 is pushed forward (leftward in FIG. 3) against the urging force of the nitrogen gas cylinder 35a. Acts like pushing. Further, when the driver pin 36 descends from above the inclined surface 35c at the rear end, the guide block 35 is pushed forward by being pushed by the tip of the driver pin 36.

  As shown in FIG. 1, the driver pin 36 is supported so as to be slidable in the press direction from the backup punch 23, and the lower end of the driver pin 36 penetrates the backup punch 23, and the slope of the rear end of the guide block 35 described above. It is formed as a slope corresponding to 35c, and comes into contact with this slope 35c. The upper end surface of the driver pin 36 can be pressed downward by a so-called pad of the press molding apparatus during press molding in a state where the rotary cam 20 is mounted on the press molding apparatus. Yes.

The press molding apparatus 10 according to the embodiment of the present invention is configured as described above and operates as follows.
That is, after a plate material as a workpiece is carried into the press forming apparatus 10, molding is performed by a rotary cam 20 and a double cam (not shown), and then the rotor 22 of the rotary cam 20 is rotated so that the molding portion 26 is moved to the workpiece. Withdrawing from the molding surface, the double cam is retracted from the molding surface of the workpiece by the back-and-forth movement (in the direction of arrow C) as in FIG. The press molding of one sheet is completed.

  In this case, at the time of press molding, a so-called pad (not shown) of the press molding device 10 presses the driver pin 36 of the lock device 30 provided on the rotary cam 20. Accordingly, the driver pin 36 moves downward in FIG. 3, and accordingly, the guide block 35 is pushed forward, and the shaft pin 33 and the fixing pin 31 are connected to the tension spring 32 via the link plate 34. Moves outward in the axial direction against tension. As a result, the tip of the fixing pin 31 protrudes from the end face of the rotor 22 as shown in FIGS. 1 and 2.

  And as shown in FIG. 8, the front-end | tip of the fixing pin 31 which protruded from the end surface of this rotor 22 fits in the engagement hole 41 provided in the end surface of the double cam 40 facing this. As a result, the rotor 22 and the double cam 40 of the rotary cam 20 are securely fixed, particularly with respect to the bending direction, by the engagement between the fixing pin 31 and the engagement hole 41. Therefore, when a press pressure is applied in the direction of the bending process by the press molding apparatus 10, the double cam 40 is squeezed by the press pressure and a step is generated between the rotary cam 20 and the rotor 22. There is nothing to do. As a result, a joint mark between the rotary cam 20 and the double cam 40 is not formed on the molding surface of the workpiece, and the moldability of the press-molded product is improved and the molding stability is improved.

  After the press molding, when the pressure applied by the pad to the driver pin 36 of the locking device 30 is released, the guide block 35 is pulled back to the retracted position by the nitrogen gas cylinder 35a. 33 and the fixing pin 31 is restored to the original position by the tension of the tension spring 32. That is, the fixing pin 31 moves from the end surface of the rotor 22 to the retracted position drawn inward. Accordingly, since the fixing pin 31 is disengaged from the engagement hole 41 of the double cam 40, the connection between the rotary cam and the double cam is released.

  As described above, the present invention can be implemented in various forms without departing from the spirit of the present invention. For example, in the embodiment described above, the fixing pin 31 of the lock device 30 is automatically pressed in conjunction with the rotor pin 22 when the driver pin is pressed by the pad during the press processing of the press processing device 10. It protrudes from the end face and fits into the engagement hole 41 of the double cam 40 and is fixed to the double cam side. However, the present invention is not limited to this, and the fixing pin 31 is connected via another type of moving mechanism. Obviously, it may be protruded from the end face of the rotor 22 automatically or manually.

It is a schematic perspective view which shows the structure of the rotary cam in one Embodiment of the press molding apparatus by this invention. FIG. 2 is a schematic perspective view of the rotary cam according to FIG. 1 with a backup punch removed. It is an expanded sectional view along the AA line in the rotary cam of FIG. It is sectional drawing along the B line in the rotary cam of FIG. FIG. 4 is a partially enlarged side view of the rotary cam of FIG. 3 viewed from the Z direction. FIG. 6 is a partially enlarged side view showing a rotor and a moving mechanism in FIG. 5. FIG. 6 is a partially enlarged side view showing only the rotor in FIG. 5. It is a partial expanded sectional view which shows the boundary vicinity of the rotary cam of FIG. 1, and the adjacent double cam. It is a schematic side view which shows the metal panel of the motor vehicle which should be shape | molded with a press molding apparatus. It is a schematic side view which shows the structure of an example of the conventional press molding apparatus for shape | molding the metal panel of the motor vehicle of FIG. It is a schematic perspective view which shows the structure of an example of the rotary cam used with the press molding apparatus of FIG. It is the elements on larger scale which show the boundary vicinity of the rotary cam and double cam in the press molding apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Press molding apparatus 20 Rotary cam 21 Holder 22 Rotor 22a Recessed part 22b Notch groove 23 Backup punch 24 Notch part 25 Guide plate 26 Molding part 30 Locking device 31 Fixing pin 32 Tension spring 33 Shaft pin 34 Link plate 35 Guide block 40 Double cam 41 Engagement Hole

Claims (4)

A rotary cam and a double cam adjacent to the rotary cam;
A press-forming apparatus in which a cylindrical rotor is arranged in a rotary cam holder so as to be rotatable around its central axis, and a part of the outer peripheral surface of the rotor is pivotally supported by a backup punch fixed to the holder,
The rotor of the rotary cam is
A fixing pin provided in the rotor so as to be slidable so as to be fitted in an engagement hole provided in an adjacent double cam projecting outward in the axial direction from an end surface facing the double cam;
A biasing member that pulls the fixing pin inward in the axial direction so as to be pulled into the rotor;
A moving mechanism for moving the fixing pin outward in the axial direction;
A press molding apparatus comprising:   The press forming apparatus according to claim 1, wherein the biasing member is a tension spring.   The moving mechanism includes a shaft pin implanted in the fixed pin, a link plate engaged with the shaft pin, a guide block that moves in the radial direction of the rotor so as to push the link plate, and the guide A driver pin that moves in a backup punch substantially perpendicularly to the surface of the holder so as to push the block radially inward of the rotor. 2. The press molding apparatus according to 2. 4. The press molding apparatus according to claim 3, wherein the driver pin protrudes from the backup punch in the press direction and is arranged so as to be pushed by a pad during press molding.

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