JP3013684B2 - Composite press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite press apparatus used for, for example, bending a peripheral edge of an automobile door outer panel.

[0002]

2. Description of the Related Art In general, prior to the hemming process of a door panel, preliminary bending (flange bending) for bending the outer edge of the outer panel to a predetermined width (perpendicular to the outer panel surface) is performed as a pre-process. However, since the outer panel W of the automobile door is normally press-molded into a shape that is slightly curved and expanded in the vehicle vertical direction (the horizontal direction in the drawing) as shown in FIG. In order to bend the edge Wa of the surface straight, it is necessary to lower the curved blade not from directly above but from obliquely upward as shown in FIGS. 4 (a) and 4 (b). It is necessary to make a "negative angle bend" to bend further inward. On the other hand, to bend the front and rear edges Wb of the outer panel W straight,
As shown in (c), it is sufficient to lower the curved blade from directly above, that is, along the pressing direction P of the pressing device. As a result, the descending direction P1 of the curved blade for bending the upper and lower edges Wa of the outer panel W and the descending direction P2 of the curved blade for bending the front and rear edges Wb are different directions. It is lowered in the direction to bite into the curved blade.

[0003] Conventionally, as a composite press device for performing such different direction bending, as shown in FIG.
(Hereinafter referred to as "press curved blade") and a curved blade (hereinafter referred to as "cam curved blade") for bending the upper and lower edges Wa to a negative angle are provided separately.
The lowering direction P2 of the press curved blade is made to coincide with the pressing direction P of the press device, while the cam curved blade for the upper and lower edges Wa descends from obliquely upward at a certain angle with respect to the pressing direction P. It is configured as follows. Therefore, in the following description, the former bending in the direction P2 is simply referred to as "press bending", and the latter bending in the direction P1 is particularly referred to as "negative angle bending" or "cam bending".

[0006] Here, a cam curved blade for performing the cam bending includes a lower edge Wa (or an upper edge Wa, hereinafter the same) and a front edge Wb (or a rear edge Wb) of the outer panel W as shown in FIG.
, The same applies to the lower end (or the upper end, the same applies hereinafter), so that the cam curved blade cuts obliquely upward (in the direction of the arrow in the figure) so as to bend in one shot. When the lower edge Wa is lowered from the front side in the figure, the lower edge Wa is bent at a negative angle, and at the same time, the lower edge a of the front edge Wb (the portion hatched in the drawing) is press bent. The reason why the cam curved blade is formed in a substantially L-shape in plan view and at the same time a part of the front edge Wb is press-bent at the same time is that the curved blade is formed with respect to the outer plate surface particularly at the corner portion of the work. This is because it is generally more preferable as a pressing condition to lower the roller along the straight direction.

As described above, since a part of the leading edge Wb is press-bent by the cam curved blade moving in the direction of biting into the press curved blade, the L-shaped vertical portion e of the cam curved blade is formed.
Is an overlapping portion with respect to the descending path of the press curved blade. For this reason, conventionally, since both curved blades cannot be lowered at the same time, a method has been adopted in which the cam curved blade is first moved down first, and then the press curved blade is lowered with a slight time shift.

[0006]

Therefore, as shown in FIG. 7, the leading edge Wb is temporarily bent at the bent portion c.
(Closer to the lower end) and an unbent portion d (closer to the center), which causes a problem in that deformation such as distortion or breakage is likely to occur on the outer plate surface at a portion b which is a boundary between the two. However, there has been a problem that a great deal of time and effort has to be spent on mold correction in order to prevent this deformation.

According to the present invention, in order to perform bending in different directions by lowering the cam curved blade in the direction of biting into the press curved blade in order to bend the peripheral edge of the curved work directly into a flange, the work is distorted. It is an object of the present invention to provide a composite press device that does not cause deformation of the press.

[0008]

According to a first aspect of the present invention, there is provided a composite press apparatus in which curved workpieces are adjacent to each other.
Bend one of the two edges in the same direction as the pressing direction of the upper die
Press bending blade and the other inward from the pressing direction of the upper die
A cam bending blade for bending at a negative angle is provided, and a movable bending blade is provided at a portion of the press curved blade that overlaps with the cam curved blade at the time of press working , with the downward movement of the cam bending blade.
The movable bending blade is retracted so that the cam bending blade and the press
The two edges are simultaneously bent while avoiding the interference of the bending blade.
Construction .

[0009]

According to the above construction, the portion of the press curved blade overlapping with the cam curved blade during press working escapes in the counter-pressing direction due to the biting of the cam curved blade. Interference does not occur. Therefore, since the press curved blade and the cam curved blade can be simultaneously pressed against the work, deformation such as distortion of the work which would otherwise occur when the conventional cam curved blade is pressed first does not occur.

[0010]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a main part of the composite press apparatus of the present embodiment, FIG. 1 shows a state before press working, and FIG. 2 shows a state after press work. In FIG. 1, 1 is an upper mold, 2
Indicates a lower mold. The upper die 1 is moved up and down by a hydraulic lifting mechanism (not shown).

On the lower surface of the upper die 1, a press curved blade 3 and a cam curved blade 7 which is lowered in a direction to bite into the press curved blade 3 are assembled. Since the press bending blade 3 is fixed integrally with the upper die 1, it moves downward in the same direction P2 as the pressing direction P of the press device. The lower surface of the press curved blade 3 is a press surface 3b that comes into contact with the work W. The portion of the press curved blade 3 that overlaps with the cam curved blade 7 during the press working is formed separately from the main body, and is retracted upward so as not to interfere with the biting of the cam curved blade 7. Has become. That is, a concave portion 3a is formed in the press surface 3b of the press curved blade 3 in a range corresponding to the overlapping portion, and the movable curved blade 4 is fitted into the concave portion 3a so as to be slidable in the vertical direction. Have been. The movable curved blade 4 is urged downward by the compression coil spring 5 toward the work W. The urging force of the compression coil spring 5 can hold the movable curved blade 4 so as not to move upward to bend the work W, but can move the movable curved blade 4 upward by the biting of the cam curved blade 7 as described later. Is set to the urging force of the following magnitude.

On the lower surface of the movable curved blade 4, there are formed a press surface 4a which is in contact with the workpiece W and a sliding contact surface 4b which is in sliding contact with the cam curved blade 7. The sliding surface 4b is provided to be inclined at a predetermined angle with respect to the pressing direction of the press device.

Next, a passive cam 6 is attached to the right side of the press curved blade 3 in the figure and to the lower surface of the upper die 1, and the above-mentioned cam curved blade is attached to a lower portion of the front (left side in the figure) of the passive cam 6. 7
Has been fixed. The passive cam 6 is supported so as to be slidable in the horizontal direction in the figure, and is urged rightward in the figure by a compression coil spring 10 interposed between the passive cam 6 and the press curved blade 3. Further, a sliding contact surface 6a for a driver cam 8 described below is formed at a lower portion of the rear surface (right side surface in the figure) of the passive cam 6. This sliding contact surface 6a is
Of the lower edge Wa to be bent at the negative angle.

The cam curved blade 7 has a substantially L-shape in plan view as in the prior art, and the press surface 7b on the lower surface thereof is pressed against the work W to bend the lower edge Wa at a negative angle, and at the same time as shown in FIG. A portion of the side edge Wb near the lower edge Wa is cam-bent. A receiving surface 7a on which the sliding contact surface 4b of the movable curved blade 4 slides is provided at the tip of the cam bent portion 7 (the L-shaped vertical portion e, see FIG. 5). The movable curved blade 4 and the cam curved blade 7 are positioned so that the sliding surface 4b is always in sliding contact with the receiving surface 7a by the urging force of the compression coil spring 5.

Next, a curved punch 9 for mounting the work W is mounted on the upper surface of the lower die 2, and the work W is moved along its edges Wa and Wb to be bent by flanges. Is set to protrude from the periphery of.
To the right of the song punch 9 in the figure, the driver cam 8
Is arranged. The driver cam 8 has a receiving surface 8 a corresponding to the sliding surface 6 a of the passive cam 6. The receiving surface 8a is provided to be inclined at the same angle so as to contact the sliding surface 6a. It should be noted that the music punch 9 and the driver cam 8 described above do not need to be particularly changed in implementing the present invention. 0, press curved blade 3,
The movable curved blade 4 and the cam curved blade 7 are separated from the periphery of the curved punch 9
In order to bend the edges Wa and Wb of the protruded work W,
It is provided in a range along the outer peripheral side of the bending punch 9,
As a result, the bending punch can be used without interfering with the bending punch 9.
9 is displaceable below the upper surface.

The workpiece W is, for example, an outer panel of an automobile door, and is curved in the vertical direction (left and right directions in the drawing). Therefore, the upper and lower edges Wa and Wa are bent by the cam curved blade 7 at a negative angle. Front and rear edges Wb, W in a direction perpendicular to the drawing
b is press-bent by the press bending blade 3, and each edge of the entire periphery thereof is flange-bent in a plane.

Although only the right side corresponding to the lower edge Wa of the workpiece W is shown in the drawing, the left side corresponding to the upper edge Wa is also configured to be the right side as shown.

The composite press apparatus of the present embodiment is configured as described above, and according to this, the press working of the work W is performed as follows. First, when the upper mold 1 descends,
As shown in FIG. 1, each press surface 3b, 4a, 7b of the press curved blade 3, the movable curved blade 4, and the cam curved blade 7 is in contact with the outer plate surface (upper surface in the drawing) of the work W, that is, each press. A state where the surfaces 3b, 4a, and 7b are flush with each other is realized.
That is, conventionally, the cam curved blade 7 was pressed against the work W in advance and the work 3 was pressed with a time shift from the press curved blade 3, but according to the press apparatus of this example, The curved blades 3, 4, and 7 are pressed against the work W at the same time.

When the upper mold 1 is further lowered from this state, the press curved blade 3 causes the front edge Wb on the front side in the figure to be shown.
(And the opposite edge Wb) is press-bent, and at the same time, the cam curved blade 7 descends obliquely from above into the press curved blade 3 so that the lower edge Wa (and the upper edge Wa) is negative. The corner is bent. When the cam curved blade 7 descends in the biting direction with respect to the press curved blade 3, the movable curved blade 4 is moved.
Moves upward against the compression coil spring 5 by a force acting through the receiving surface 7a and the sliding contact surface 4b. That is,
The movable curved blade 4 escapes upward due to the biting of the cam curved blade 7. However, the press surface 4a is pressed against the outer plate surface of the work W with a force corresponding to the urging force of the compression coil spring 5, so that the portion of the work W that abuts on the press surface 4a is the same as other portions. Can be bent with sufficient force.

When the upper die 1 reaches the lower limit, the curved blades 3, 4, and 7 also reach the lower limit as shown in FIG. 2, and the lower edge Wa of the work W is bent at a negative angle. Is bent by press, but the movable curved blade 4 is displaced upward relative to the press curved blade 3 and the cam curved blade 7, and the movable curved blade 4 is accordingly displaced by the cam curved blade 7. It is in a state of being released only upward.

As described above, according to the composite press apparatus of the present embodiment, the portion of the press curved blade 3 that overlaps the cam curved blade 7 is formed as a movable curved blade 4 and is formed separately. Since the curved blade 4 is relieved by the depth of the cam curved blade 7, the cam curved blade 7 does not interfere with the press curved blade 3. Therefore, it is not necessary to lower the press curved blade with a time lag to avoid the interference between the cam curved blades as in the related art. Wa, Wa and the front and rear edges Wb, Wb on the front side and the opposite side in the direction perpendicular to the drawing can be simultaneously flange-bent.

Since the cam curved blade 7 and the press curved blade 3 are pressed against the edges Wa and Wb of the work W at the same time, a portion c bent to the front and rear edges Wb and a portion d not yet bent as in the prior art are formed. Since the front and rear edges Wb are positively bent by the movable curved blade 4 as well, deformation such as distortion of the outer plate surface generated at the boundary portion b between the two portions c and d does not occur.

[0023]

According to the present invention, different direction bending can be performed without causing deformation such as distortion on the outer plate surface.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of a main part of a composite press device.

FIG. 2 is a side view of a relevant part of the composite press device in a state in which the upper die has reached the lower limit according to the embodiment of the present invention.

FIG. 3 is a perspective view of a door outer panel as an example of a work.

4 is a view showing a bending direction of each part of the door outer panel. FIG. 4 (a) is a sectional view taken along line AA of FIG. 3, and FIG. 4 (b) is an enlarged view of a part C of FIG. And (c) is a sectional view taken along the line BB of (a).

FIG. 5 is a plan view showing a positional relationship of a cam curved blade with respect to a lower corner portion of a work.

FIG. 6 is a side view showing a state in which a cam curved blade and a press curved blade overlap each other, which is a main part of a conventional composite press machine.

FIG. 7 is a perspective view of the lower corner portion of the work immediately after the cam curved blade is lowered in advance in the conventional composite press device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper die 2 ... Lower die 3 ... Press curved blade 3a ... Recess 4 ... Movable curved blade 5 ... Compression coil spring 6 ... Passive cam 7 ... Cam curved blade W ... Work (door outer panel) Wa ... Work upper and lower edges Wb ... Front and rear edges of work P: Pressing direction of upper die P1: Pressing direction of cam curved blade P2 ... Pressing direction of press curved blade

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 19/08 B21D 5/01 B21D 37/08

Claims (1)

(57) [Claims] 1. Two adjacent edges of a curved workpiece
Of the upper die is bent in the same direction as the pressing direction of the upper die.
The bending edge and the other side are bent inward from the pressing direction of the upper die.
A movable bending blade is provided at a portion of the press curved blade that overlaps with the cam curved blade during press working;
The movable bending blade is retracted with the downward movement of the
While avoiding interference between the bending blade and the press bending blade,
A composite press device configured to simultaneously bend two edges .