JP2872496B2 - Press mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die apparatus for press-forming a metal plate such as an automobile body into a predetermined uneven shape.

[0002]

2. Description of the Related Art A metal plate which is press-formed on a body of an automobile or the like has a portion which is largely displaced by a springback after the press-forming. The mold for pressing such a part is corrected (mold correction) from the original pressed shape to a shape that allows for the springback amount of the metal plate. A specific conventional example of such a metal plate pressing die will be described with reference to FIGS.

[0003] A press mold apparatus shown in FIGS. 3A and 3B is a pair of first molds 20 for press-forming a metal plate 1.
And a second mold 21. The first mold 20 is a fixed mold, and a concave portion 22 is formed on the press surface side thereof. The second mold 21 is a movable mold that approaches and separates from the first mold 20.
Has a convex portion 23 to be inserted into the. The concave portion 22 and the convex portion 23 have a concavo-convex shape for pressing the metal plate 1 into a regular shape, that is, a shape that does not allow for the springback amount of the metal plate 1.

As shown in FIG. 3A, one end 1a of the metal plate 1 before being pressed is fixed by sandwiching it with a first mold 20 and a pad 24, and is the other end of the metal plate 1. The pressed portion 1b is located in front of the concave portion 22 of the first mold 20. In this state the second
The mold 21 is brought closer to the first mold 20 and the metal plate 1 is
The metal plate 1 is press-formed into the regular concave and convex shape by the convex portion 23 and the concave portion 22 as shown in FIG. I do.

After the press forming shown in FIG. 3B, the metal plate 1 is taken out by removing the mold, and the first and second molds 2 of the metal plate 1 are removed.
The pressed portion 1b pressed in steps 0 and 21 is displaced by the springback from the normal position shown by the chain line in FIG. 4 to the position shown by the solid line in FIG. 4, and the metal plate 1 does not have a proper shape.

Therefore, the amount of springback of the metal plate 1 is measured, and based on the measured value, the thickness of the concave portion 22 of the first die 20 is corrected, while the convex portion 23 of the second die 21 is corrected. The mold correction of the meat cutting is performed. This mold correction is performed as follows with reference to the fact that the pressed portion 1b of the metal plate 1 is pressed with a press bending amount larger than the normal press shape and is displaced into the normal shape by springback after pressing. Will be

[0007] The recess 22 of the first mold 20 is built up to the location of the recess 22 indicated by the chain line in FIG. Second mold
With respect to the convex portions 23 of 21, the portions of the convex portions 23 are deleted up to the portions indicated by the chain lines in FIG. The build-up amount and the build-up amount of the build-up portion 25 of the concave portion 22 and the build-up portion 26 of the convex portion 23 are set in anticipation of the springback amount of the metal plate 1. The concave portion corrected in this way
Pressed portion 1b of metal plate 1 pressed by 22 and convex portion 23
Is displaced into a regular shape by springback.

[0008]

Since the mold correction of the pair of dies has a problem in accuracy only once, the metal plate is repeatedly pressed several times with the pair of dies, and each time the metal plate is pressed, The amount of springback of the metal plate is measured, and the measurement is performed stepwise in several steps. Therefore, it takes a long time until the mold correction of the pair of dies is completed, and the operation rate of the press forming machine for the metal plate is deteriorated.

In addition, it is difficult to match the machining amount between the build-up amount and the cut-out amount in the mold correction in which one of the pair of molds is built up and the other is machined. However, there is a problem that it is difficult to perform the mold correction, and a mold correction error is likely to occur, and the mold correction period is even longer.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press die apparatus capable of easily correcting a pair of dies for pressing a metal plate in a short time and with high accuracy.

[0011]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for press-forming a metal plate into a concave and convex shape using a pair of concave portions of a first mold and convex portions of a second mold. And each of the convex portions of the second mold, a movable block that presses a portion where the metal plate is displaced by springback after press forming, and another portion of the metal plate is pressed, and the movable block is pressed by the metal plate. The object is achieved by configuring the main body block to be rotatable in a direction in which springback is corrected.

[0012]

By setting the mounting angle of the movable block in each of the main blocks of the first mold and the second mold in anticipation of the amount of springback of the metal plate pressed by the movable block, a pair of movable blocks can be used. The pressed metal plate can be formed into a regular shape by springback.
Such mold correction by adjusting the mounting angle of the movable block in the pair of dies is performed in a short time with a simple operation of simply rotating the movable block with respect to the main body block.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. This press die apparatus comprises a pair of a first die 2 and a second die 2 for pressing the metal plate 1 described above. 3 is provided. The first mold 2 is a fixed mold, and the second mold 3 is a movable mold that approaches and separates from the first mold 2. First mold 2
The metal plate 1 is pressed into an uneven shape by the concave portion 4 formed on the press surface side of the metal mold 1 and the convex portion 5 formed at the tip of the second mold 3.

The feature of the embodiment shown in FIG. 1 is that the concave portion 4 of the first mold 2 is composed of a movable block 6 and a main body block 7, and the convex portion 5 of the second mold 3 is composed of a main body block 8 and a movable block. 9. Each of the movable blocks 6, 9 of the first and second molds 2, 3 is a portion for pressing the pressed portion 1b which is displaced by springback after pressing the metal plate 1, and each of the main body blocks 7, 8 is made of metal. This is a part for pressing other parts of the plate 1. The movable blocks 6, 9 are rotatably supported by the body blocks 7, 8 in a direction to correct the springback of the metal plate 1.

The movable block 6 of the first mold 2 is fitted in an arc groove 11 formed substantially below the recess 4 of the main body block 7. The movable block 8 of the second mold 3 is
Is fitted in a circular arc groove 12 formed at the lower part of the convex portion 5 of FIG. As shown in FIGS. 1B and 2B, a pair of first and second
When the metal plate 1 is pressed by the molds 2 and 3, the arc grooves of both are pressed.
The movable blocks 6 and 9 are fitted in a semi-cylindrical shape with the metal plate 1 interposed therebetween. Each of the movable blocks 6 and 9 is attached to a corresponding one of the main body blocks 7 and 8 so as to be rotatable about a center point P of the arc grooves 11 and 12.

FIG. 1 shows a state in which the springback of the metal plate 1 is considered, and FIG. 2 shows a state in which the springback amount of the metal plate 1 is measured. First, the press mold apparatus in the state of FIG. 2 will be described.

As shown in FIG. 2 (a), the movable blocks 6, 9 of the first and second dies 2, 3 are placed at positions where the metal plate 1 is pressed in a regular shape, and the corresponding main bodies are respectively placed. Temporarily fix to the blocks 7 and 8 with the fasteners 13 and 14. First mold 2
And one end 1a of the metal plate 1 between the pad 24 and
As shown in FIG. 2B, the metal plate 1 is press-formed by the first mold 2 and the second mold 3.

The metal plate 1 pressed in FIG. 2 (b) is pressed in a regular shape as in the case of FIG. 3 (b). Next, the mold is removed and the amount of springback of the metal plate 1 is measured. Based on this measured value, as shown in FIG.
The movable block 6 of the first mold 2 and the movable block 9 of the second mold 3 are rotated by the same desired angle in the direction opposite to the springback direction of the metal plate 1 to respectively correspond to the corresponding main body blocks 7, 8. And fix them with the stoppers 13 and 14. Adjustment of the mounting angle by rotation of the pair of movable blocks 6, 9 can be performed in a short time with a simple operation. Further, the movable blocks 6, 9
Can be easily adjusted to an arbitrary angle with sufficiently high precision, so that highly accurate mold correction can be performed.

The mounting angle adjustment by rotating the pair of movable blocks 6 and 9 can be performed simultaneously in the state shown in FIG. 2B. In this way, the mold correction operation can be performed in a much shorter time.

When the metal plate 1 is press-formed with the first mold 2 and the second mold 3 in the state of FIG. 1A as shown in FIG. 1B, a pair of movable blocks 6 of the metal plate 1 are formed. , 9 are pressed with a larger press amount than the regular shape, and after the mold is released, the pressed portion 1b becomes a regular shape by springback.

[0021]

According to the present invention, die correction for press-forming a metal plate into a regular uneven shape in anticipation of its springback is performed by mounting a pair of movable blocks of a first die and a second die. Only the angle adjustment is required, so that the mold correction can be performed in a short time with a simple operation, and the operation rate of the press molding machine can be improved.

Further, since the mounting angle of the movable block of the first and second dies can be arbitrarily set by closely following the amount of springback of the metal plate, a high-performance press die capable of performing die correction with high accuracy. A mold device can be provided. First,
The mounting angle of the movable block of the second mold can be easily adjusted by following the change of the metal plate to a product having a different size, so that a versatile press die device applicable to various metal plates. Can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a press die apparatus showing an embodiment of the present invention, in which (a) is before press and (b) is during press.

FIGS. 2A and 2B are side views of a main part of the apparatus before mold correction, in which FIG. 2A shows a state before pressing and FIG.

FIG. 3 is a side view of a main part of a conventional press die apparatus, and FIG.
Is before pressing, and (b) is during pressing.

FIG. 4 is a side view of a metal plate pressed by the apparatus in FIG. 3;

FIG. 5 is a side view for explaining mold correction of the apparatus in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 metal plate 2 first mold 3 second mold 4 concave portion 5 convex portion 6,9 movable block 7,8 body block

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 5 / 01,37 / 02,37 / 08

Claims (1)

(57) [Claims] A first mold and a second mold; a first mold and a second mold;
An apparatus for press-forming a metal plate into a concave and convex shape using a concave portion of a mold and a convex portion of a second mold, wherein each of the concave portion of the first mold and the convex portion of the second mold is formed by press-forming the metal plate. A movable block that presses a portion that is later displaced by a springback, and a main body block that presses another portion of the metal plate and rotatably supports the movable block in a direction to correct the springback of the metal plate. A press mold apparatus characterized by being performed.