JP2002001456A - Press forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press forming apparatus effectively producing a trimmed and flanged compound product by performing both of trimming and flange processing in a same die. SOLUTION: In the press forming apparatus 1, a lower die 2 is provided with a die having lower cutting edges 11 and 15 performing a first and second trimming of a work and also a lower bending edge 10 performing flange processing of the work. An upper die 3 is provided with a punch having upper cutting edges 32 and 34 cutting the work in accordance with the lower cutting edges 11 and 15 and an upper bending edge 33, which locates in the back of the aforementioned upper cutting edge, performing flange processing. The apparatus is also provided with a lower movable cutting edge 6 supported via a vertical motion mechanism 20, in which the mechanism is located adjacent to the lower cutting edge at a crossed point between a trimming line and flange line of the aforementioned work, and a pushed moving means 36 operating the vertical motion mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming apparatus for forming a metal plate to process a door panel of an automobile or the like, and in particular, performs trimming and flange processing on the outer periphery of the metal plate in the same mold. The present invention relates to a press forming apparatus that can perform the press forming.

[0002]

2. Description of the Related Art Conventionally, when a door panel of an automobile or the like is formed by a press forming apparatus, trimming (cutting the outer peripheral edge) is performed on an outer peripheral edge of the metal plate (work).
Press forming for performing flange processing (bending the outer peripheral edge to form a flange) is performed as necessary.

[0003] Some door panel products have a workpiece having both a flanged portion and a flangeless portion on the outer peripheral edge. Then, in order to manufacture such a work, in a conventional press forming apparatus, after drawing, trimming was first performed using upper and lower dies for trimming, and then the trimming was performed. At present, the workpiece is subjected to flanging in the next step by using another upper and lower mold for flanging by another press forming apparatus.

[0004]

However, the conventional press forming apparatus has the following problems.
That is, conventionally, in order to manufacture a work, two steps of trimming processing and flange processing are required, so that the number of steps is increased, and a dedicated mold is required for both steps. There was a problem of becoming.

Also, the reason why the conventional press forming apparatus cannot perform the trimming and the flange processing is that the upper die at the intersection of the part where the flange processing is performed after the trimming and the part where only the trimming is performed intersects. The cutting edge of the lower die interfered, and it was a structure in which it was not possible to machine an intersecting portion that required performing flange machining and trimming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to perform trimming and flange processing in the same mold by improving the structure of the intersection between the trimming and flange processing. It is an object of the present invention to provide a press forming apparatus which can be used.

[0007]

In order to achieve the above object, the present invention is as follows. That is, press forming in which the first and second trimming processes and the first and second trimming processes are performed in the same die along the trimming line and the flange line of the workpiece by displacing the upper die and the lower die close to each other. An apparatus, wherein the lower die is provided with a lower cutting edge arranged at a position where the first and second trimming processes of the work are performed, and a flange processing of the work at a position facing the lower cutting edge. A die having a lower die curved blade disposed at a position where the upper die is to be formed, wherein the upper die performs the first and second trimming processes corresponding to the lower die cutting blade; and (1) A punch having an upper curved blade for performing flange processing of a work corresponding to the lower curved blade and located on the back surface of the upper mold cutting blade for performing the trimming process, wherein the trimming line and the flange line of the work are provided. Exchange A lower die movable cutting blade disposed adjacent to the lower die cutting blade at a position to be moved, a vertical movement mechanism for supporting the lower die movable cutting blade, and pushing means for operating the vertical movement mechanism. I have. The up-and-down movement mechanism is configured to perform the lower mold movable cutting against a shearing force for performing an intermediate trimming process at a position where one end where the first trimming process is performed and one end where the flange processing is performed are continuous. By maintaining the height position of the blade, operating and descending by the pushing means, the lower and upper cutting blades after the vertical movement mechanism descends to a position where it does not interfere with the upper cutting blade. It was configured as a press molding device for performing the second trimming.

With such a configuration, when the work is placed on the die of the lower die and the punch of the upper die is lowered, the distance between the upper die cutting edge of the punch and the lower die cutting edge of the die becomes lower. The first trimming of the workpiece is performed in the next step. Then, the intermediate trimming at a position where one end where the first trimming is performed and one end where the flange processing is performed in the next operation is continuous, is an upper die cutting. It is performed by a blade and a lower movable cutting blade. Further, the upper curved blade and the lower curved blade successively perform flange processing on the workpiece at the position where the first trimming process and the intermediate trimming process are performed. When the flange processing is performed, the vertical movement mechanism is actuated (moved down and retracted) by the pushing means, so that the second trimming processing is performed on the workpiece by the lower die cutting blade and the upper die cutting blade. Done.

The vertical movement mechanism includes a piston rod supporting the lower movable cutting blade, a cylinder holding the piston rod and fixed to the die side, and a cylinder fixed to the die side and movable to the lower die side. A stopper means for regulating the upper limit of the movement of the cutting blade is provided.

With this configuration, the lower die movable cutting blade is held at the same height as the lower die cutting blade by the piston rod and the cylinder, thereby enabling intermediate trimming.
Actuated by the pushing means, the piston rod part is pushed and the lower movable cutting edge descends to a position where the upper cutting edge does not interfere, and after the second trimming process is completed, it is automatically raised by the fluid pressure of the cylinder And can always be kept at the same height as the lower cutting edge by the stopper means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of a lower mold of the press molding apparatus, FIG. 2 is a plan view of a lower mold portion of the press molding apparatus showing an intermediate trimming process, and FIG. 3 [A1] is a sectional view taken along line AA of FIG. FIG. 4 is a cross-sectional view showing main parts of the upper mold and the lower mold, [B1] is a cross-sectional view showing main parts of the upper mold and the lower mold along line BB in FIG. 2, and FIG. FIG. 3 is a cross-sectional view showing the operation of the first trimming process and the flange process of the upper mold and the lower mold along the line AA in FIG.
[C2] and [C3] are cross-sectional views showing the intermediate trimming operation of the upper mold and the lower mold along the line CC in FIG. 2, and FIG.
[A4] [A5] is a cross-sectional view showing the operation of the flange processing of the upper mold and the lower mold along the line AA in FIG. 2, [B4]
[B5] is a cross-sectional view showing the operation of the second trimming processing by the upper die and the lower die along the line BB in FIG. 2, and FIG.
(A) to (c) are perspective views of main parts showing the operation of the intermediate trimming processing, FIGS. 7 [A1] to [A4] are plan views showing the entire work, and [B1] to [B4] are flanges of the work. FIG. 8 is a perspective view showing a main part of an intersection point where processing and trimming are performed, and FIG. 8 is a side view showing an application example of a pushing means of a press forming apparatus.

As shown in FIGS. 1 to 3, a press forming apparatus 1 is configured to carry a first work W as a metal plate in the same mold.
Trimming line L1a, intermediate trimming line L1
b, flange line L2 and second trimming line L
1c to perform a first trimming process, an intermediate trimming process, a flange process, and a second trimming process, respectively, and a lower mold 2 having a die 4 and a vertical movement above the lower mold 2. The upper mold 3 is provided with a punch 5 and is arranged as possible.

As shown in FIGS. 1 to 5, the die 4 of the lower die 2 includes a lower die cutting edge 11 disposed inside the work W along a second trim line L1c, and a flange line L2. A lower die outer peripheral edge cutting edge 15 which is a lower die cutting edge disposed at a position along the lower die cutting edge, and a lower die cutting edge arranged opposite to the lower die bending blade 10 with grooves 12 at regular intervals. At the position where the first trim line L1a and the flange line L2 intersect (intermediate trimming line L1b), the lower die outer peripheral cutting edge 1
5 and a lower movable cutting edge 6 provided adjacent to the lower cutting edge 11
And a vertical movement mechanism 20 that supports the lower movable cutting blade 6.

As shown in FIG. 1, the curved lower blade 10 and the lower cutting edge 11 are formed in a plane shape (a chain line shown in FIG. 7 [A1]) of a door panel formed by press forming of the work W. It is arranged along the position. The lower curved edge 10 is a portion where flanges are formed on both sides and the upper side (portions in the directions of arrows 7 and 8 from points P0, P1, P2, and P3) in FIG. 1 and have rounded corners. (See FIG. 3 [A1]).
reference). In addition, the lower die cutting edge 11 is a portion where the upper side (portion between the points P1 and P2) in FIG. 1 performs the second trimming process, and is formed to be perpendicular to the upper surface (FIG. 3 [B1]). ]reference).

As shown in FIGS. 1 and 3, the lower curved blade 1
A lower die outer peripheral cutting edge 15 that is perpendicular to the upper surface via the groove 12 is disposed outside the zero. A tapered surface 16 for holding the drawing portion W1 of the workpiece W is formed on the upper and outer portions of the lower die outer peripheral cutting edge 15. Die 4
In the drawings, is formed integrally with the groove 12, but may be formed separately from the groove 12.

Next, the lower movable cutting blade 6 is shown in FIG.
1], FIG. 4 [C2], [C3] and FIG. 5 [B4],
As shown in [B5], it is installed so as to be in contact with the outside of the lower die cutting edge 11, and is subjected to intermediate trimming processing (between P0 and P1,
(Between P2 and P3) is slidably supported by a fluid spring 20 which is an example of a vertical movement mechanism. A tapered surface 18 for holding the drawing portion W1 of the work W is formed on the upper and outer portions of the lower movable cutting blade 6, and a sliding plate 19 is attached to a side surface of the body portion 6a.

The fluid spring mechanism 20 is shown in FIG.
As shown in FIG. 5, a cylinder 21 fixed to the die 4, a piston rod 22 supported in the cylinder 21 by fluid pressure, and a stopper bolt 23 as stopper means for regulating the upper limit of the movement of the lower movable cutting blade 6 And The piston rod 22 is in contact with the lower portion of the lower movable cutting edge 6 to support the lower movable cutting edge 6 at the same height as the lower movable cutting edge 11. The piston rod 22 is preferably a gas cylinder using a nonflammable gas as the pressure fluid, but may be a general air cylinder.

The stopper bolt 23 for regulating the upper limit of the movement of the lower movable cutting blade 6 has a stepped stopper bolt mounting hole 6b in the body 6a, and the stopper bolt mounting hole 6b has a stopper bolt mounting bolt 6b. The head 24 is slidably held, and the lower movable cutting blade 6 is locked at the position of the step to restrict elevation. At the upper limit position of the movement, the upper surface of the lower movable cutting edge 6 and the upper surface of the lower movable cutting edge 11 are flush with each other.

As shown in FIGS. 2 and 3, the fluid spring 20 is connected between points P0 and P1 and between points P2 and P2.
It is configured to maintain the height position of the lower movable cutting edge 6 against the shearing force for performing the intermediate trimming between the three. Further, the fluid spring 20 is actuated by a knockout bar 36 as a pushing means described later, and descends and retracts to a position where the lower trimming blade 11 and the second upper trimming blade 34 can perform the second trimming. It is configured to be.

On the other hand, the punch 5 of the upper mold 3 is shown in FIG.
1] through FIG. 5 [A4] [A5], as shown in FIG.
At the position where the lower die outer peripheral edge 15
The first upper die cutting edge 32 and the upper die curved blade 33 are arranged so as to face the lower die curved blade 10 and one end of the first upper die cutting blade 32 and the upper curved blade 33. Intermediate cutting blade 3
9 (see FIG. 6A), a second upper cutting edge 34 arranged at a position facing the upper side of the lower cutting edge 11, and an example as a pushing means for operating the fluid spring 20. A knockout bar 36 is provided. In FIG. 3, the first upper die cutting edge 32 and the upper die curved blade 33 are configured as a single body, but may be configured as separate bodies and arranged adjacent to each other back to back.

As shown in FIG. 3 [A1], the first upper die cutting edge 32 has a cutting blade that slides along the outer peripheral edge cutting edge 15 on the outer surface. On the opposite side of the first upper die cutting blade 32 from the cutting blade, an upper die curved blade 33 is formed integrally with the cutting blade with a step. This upper curved blade 33
Is disposed immediately above the lower curved blade 10 and the lower curved blade 10
Thus, the flange 26 of the work W can be bent in a right angle direction (FIG. 4A).
2] to FIG. 5 [A5]).

The second upper cutting edge 34 is a lower cutting edge 11.
, And the workpiece W is subjected to a second trimming process. Further, a knockout bar 36 provided on the punch 5 is installed at a position above the body portion 6a of the lower movable cutting blade 6 and protrudes below the second upper cutting edge 34 (see FIG. 4). FIG. 3 [B1]).

As shown in FIGS. 6 and 4 [C 2] and [C 3], the intermediate cutting edge 39 is located at a position adjacent to the lower movable cutting edge 6 at a point P 0, P 1 and a point P 2, P 3. It is configured to slide along the lower movable cutting edge 6 in order to perform intermediate trimming.

Next, the operation when the work W is trimmed and flanged by the press forming apparatus 1 to form a door panel will be described with reference to FIGS.
First, FIG. 7 [A1] [B1] and FIG. 3 [A1]
As shown in [B1], the workpiece W that has been subjected to the drawing process is placed on the lower mold 2. The drawing portion W1 on the outer periphery of the work W is set in a state fitted on the tapered surface 16 of the lower die outer peripheral edge cutting edge 15 and the tapered surface 18 of the lower movable cutting edge 6 of the lower die 2 (FIG. 3). [A1] and [B1]). The original form of the work W is shown in FIG. 7 [A1].

Next, when the upper die 3 is lowered by a hydraulic press or the like, the first upper cutting edge 32 and the lower outer peripheral edge cutting edge 15 cause the first trimming of the work W along the first trimming line L1a. Processing is performed (see FIG. 4 [A2]). FIG. 4A shows a cut portion 25 of the work W by the first trimming process.
3] and FIG. 7 [A2] [B2]. At this time,
The second upper die cutting edge 34 approaches the lower die movable cutting blade 6 side by an amount corresponding to the lowering of the upper die 3 (see FIG. 4 [C2]).

Further, FIG. 4 [A3] [C3] and FIG.
As shown in (b), the first upper die cutting edge 32 descends to
2, intermediate trimming is performed by the intermediate cutting edge 39 between P0 and P1 and between P2 and P3 (see FIG. 1).
To the part of At this time, the lower movable cutting blade 6
Of the lower movable cutting edge 6 does not descend while resisting the shear stress in L1b.

As shown in FIGS. 5 and 6C, when the upper mold 3 is further lowered, the upper curved blade 33 and the lower curved blade 10 are moved.
Flanging is performed by bending the cut edge of the workpiece W between the steps (A and B in FIG. 5). The flange 26 of the workpiece W that has been subjected to the flange processing is connected to the flange 26 shown in FIG.
4] [A5] and FIG. 7 [A3]. At this time, the knockout bar 36 comes into contact with the upper surface of the lower movable cutting edge 6 (see FIG. 5 [B4]). Here, the timing at which the flange processing is completed and the timing at which the second trimming processing is started are set to be performed almost simultaneously.

As shown in FIGS. 5B4 and 5B, when the upper mold 3 further descends, the second upper mold cutting blade 34 descends,
The knockout bar 36 pushes down the lower movable cutting edge 6 against the piston rod 22 of the fluid spring mechanism 20, and at the same time, the outer side of the workpiece W between the exposed lower cutting edge 11 and the second upper cutting edge 34. The second trimming line L1c which is a peripheral edge
Shear position. This cut portion 27 is shown in FIG.
And [A4] of FIG. As described above, the first trimming and the flange processing and the second trimming can be performed with a time difference in the same process via the intermediate trimming.

In the above operation, the flange processing steps [A3], [A4] and [[A5] shown in FIGS. 4 and 5 and the second trimming processing steps [B4] and [B5] shown in FIG. Although the case where the steps correspond to each other has been described, it is not necessary that the steps correspond completely. If [A5] and [B5], which are the final steps, match, the steps in the middle do not need to match completely. .

In particular, it is more convenient if the timing of the trimming process in the trimming process and the flange process does not interfere with the timing of performing only the trimming process.

In FIG. 5, the knockout bar 36 as the pushing means has been described as being installed on the punch 5 side. However, as shown in FIG. 8, the knockout bar 36 may be installed on the die 4 side. That is, as shown in FIG. 8, the cylinder mechanism 40 as the pushing means includes a movable pedestal 41 for supporting the lower movable cutting blade 46, and a slide guide 42 for slidably supporting the movable pedestal (driver cam). And a cylinder driving unit 43 having a piston rod 43a and a cylinder 43b for moving the movable pedestal 41 along the slide guide. The lower movable cutting blade 46
A spring 44, which is an example of a control mechanism, is attached to the lower end side of the lower end, and is configured to always urge the lower movable cutting blade 46 downward.

When performing the intermediate trimming process described with reference to FIG. 3, the cylinder mechanism 40 adjusts the height position of the lower movable cutting blade 46 against the shearing force so as to lower the lower cutting edge (11). ). When performing the second trimming process,
It is set in advance by operation control means (not shown) for operating the operation of the cylinder mechanism 40, and is configured to operate at an appropriate timing as described in the operation description of FIGS.

Further, the configuration of the slide guide 42 is such that the flat portion of the die is slid using a resin impregnated with lubricating oil, so that the configuration may be simple. Of course, as long as the slide guide can be moved linearly, for example, a guide groove (not shown) is formed on the die side and the pedestal 41 can slide and move along the guide groove. The configuration is not particularly limited.

Although the above-described press forming apparatus has been described for the door panel, the present invention is not particularly limited as long as the flange processing and the trimming processing are performed by the same mold. Further, the pushing means for operating the lower movable cutting edge may be installed on either side of the die or the punch, and during the intermediate trimming, the lower movable cutting edge is opposed to the shear pressure of the upper cutting edge. There is no particular limitation as long as the height of the blade can be maintained and the second trimming process can be performed by lowering or sliding the lower movable cutting blade at a predetermined timing to retract.

Furthermore, the bending angle of the workpiece by the flange processing is shown in the drawing as an example in which the workpiece is bent in the direction of 90 degrees, but the bending angle can be adjusted by changing the shapes of the upper curved blade and the lower curved blade. In particular, the bending angle is not limited.

[0036]

As described above in detail, the press forming apparatus of the present invention has excellent effects as described below. In the press forming device, the lower movable cutting blade interferes with the upper die cutting blade because the lower movable cutting blade is installed via a vertical movement mechanism at the part where the flange processing and the trimming processing are intersected. And the flange processing and the trimming processing can be performed by the same mold. In addition to being able to efficiently process a trim / flange combined type workpiece, it is also possible to perform flange processing and trimming processing with a common die, improving processing speed, reducing installation space, and reducing die costs. It can be cheap.

Further, since the fluid spring mechanism of the press forming apparatus is mounted below the die of the lower mold, the movable cutting edge of the lower mold is held at the same height as the cutting edge of the lower mold, and the function of supporting the work is maintained. And lowered by pressing with the pressing means,
The lifting operation can be performed smoothly by releasing the pressing.

When the pressing means of the press forming apparatus is provided on the punch of the upper die, the operation of lowering the movable cutting edge of the lower die can be performed by a mechanical contact, so that the operation control is simplified. And a simple structure is sufficient. Further, if the pressing means is provided on the die of the lower mold, the operation timing of the vertical movement mechanism supporting the lower movable cutting blade can be freely changed, which is convenient.

[Brief description of the drawings]

FIG. 1 is a plan view of a lower die of a press forming apparatus according to the present invention.

FIG. 2 is a plan view of a lower mold part of the press molding apparatus according to the present invention, showing an intermediate trimming process.

FIG. 3 is a press molding apparatus according to the present invention,
[A1] is a cross-sectional view showing the main part of the upper mold and the lower mold along the line AA in FIG. 2, and [B1] shows the main part of the upper mold and the lower mold along the line BB in FIG. It is sectional drawing.

4] [A2] and [A3] are cross-sectional views showing operations of first trimming processing and flange processing of an upper mold and a lower mold along line AA in FIG. 2, and [C2] [C3] are FIG. It is sectional drawing which shows the intermediate | middle trimming operation | movement of an upper metal mold | die and a lower metal mold | die along CC line of FIG.

5 [A4] and [A5] are cross-sectional views showing the operation of flange machining of the upper mold and the lower mold along the line AA in FIG. 2, and [B4] and [B5] are B- in FIG. It is sectional drawing which shows operation | movement of the 2nd trimming processing by the upper metal mold | die and a lower metal mold | die in a B line.

6 (a) to 6 (c) are perspective views of main parts showing an operation of the intermediate trimming processing of the present invention.

[A1] to [A4] are plan views showing the entire work, and [B1] to [B4] are perspective views showing main parts of intersection points where the work is flanged and trimmed.

FIG. 8 is a side view showing an application example of the pushing means of the press forming apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press forming apparatus 2 Lower die 3 Upper die 4 Die 5 Punch 6 Lower die movable cutting blade 6a Body part 6b Stopper bolt mounting hole 7, 8 Arrow 10 Lower die curved blade 11 Lower die cutting blade 12 Groove 15 Lower die outside Peripheral cutting edge (lower cutting edge) 16 tapered surface 18 tapered surface 19 sliding plate 20 fluid spring (vertical movement mechanism) 21 cylinder portion 22 piston rod 23 stopper bolt (stopper means) 24 bolt head 25 cutting portion 26 flange 27 Cutting portion 32 First upper die cutting edge (upper die cutting blade) 33 Upper die curved blade 34 Second upper die cutting blade (upper cutting blade) 36 Knockout T-bar (pushing means) 40 Cylinder mechanism (pushing means) 41 Base (driver cam) 42 Slide guide 43 Cylinder drive unit L1a First trimming line L1b Intermediate trimming line L1c Second trimming line L2 Lunge line

Claims (2)

[Claims] 1. A combined processing of a first trimming process and a flange process along a trimming line and a flange line of a workpiece by displacing an upper mold and a lower mold close to each other and a second trimming process in the same mold. A lower die, wherein the lower die is provided with a lower die cutting edge arranged at a position where the first and second trimming processes of the work are performed, and a position of the lower die facing the lower die cutting blade. A die having a lower curved blade disposed at a position where the flange processing is performed; and the upper die includes an upper die that performs the first and second trimming corresponding to the lower die. A punch having an upper curved blade for performing flange processing of a work corresponding to the lower curved blade, the punch being positioned on a back surface of the upper mold cutting blade for performing the first trimming processing, and a trimming line of the work and a flange. Line and A lower die movable cutting blade disposed adjacent to the lower die cutting blade at a portion where the lower die crosses, a vertical movement mechanism for supporting and driving the lower die cutting blade, and a pushing means for operating the vertical movement mechanism The vertical movement mechanism is configured to move the lower die against a shearing force for performing an intermediate trimming process at a position where one end where the first trimming process is performed and one end where the flange processing is performed are continuous. The lower cutting edge and the upper cutting edge are maintained after maintaining the height position of the cutting edge and moving down by operating the pushing means to a position where the vertical movement mechanism does not interfere with the upper cutting edge. Second by
A press forming apparatus characterized by performing trimming. 2. The vertical movement mechanism includes a piston rod supporting the lower movable cutting blade, a cylinder holding the piston rod and fixed to the die, and a lower cylinder fixed to the die and movable to the die. 2. The press-forming apparatus according to claim 1, further comprising stopper means for restricting the upper limit of the movement of the cutting blade.