JP3209262B2 - Drawing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used for drawing a plate-shaped blank material to obtain a drawn part to be obtained.

[0002]

2. Description of the Related Art In a first prior art, a general drawing method using a punch and a die is used. In a second prior art, an opposite drawing method using a punch and a liquid pressure is used. There is a hydroforming method, for example, JP-A-59-56925.

[0003]

In the first prior art,
Both punch and die are required. When only a small amount is produced, the mold cost is higher than in the second conventional technique which can be formed only by a punch. Further, in these conventional techniques, only one drawing part can be obtained in one operation.

[0004]

SUMMARY OF THE INVENTION A mold cost is reduced by using a die and a hydraulic pressure without using a punch. Many parts used in products such as automobiles use both different drawing parts.In such a case, a particularly effective method is to arrange the different dies face-to-face and reduce the hydraulic pressure. The blank material is pressed against the inner shape of the die using this to form two drawn parts at the same time. However, it goes without saying that the dice need not necessarily be different.

[0005] Two sets of forming dies having an inner shape die corresponding to the outer shape of the drawing part to be obtained are prepared, and the first and second forming dies are arranged facing each other. A first blank material, a plate, and a second blank material, which are similarly made of a material, are successively sandwiched, and these are further held by a press machine in a pressurized state in which a pressing force serving as a necessary plate pressing force is applied, and A pressurized fluid is supplied between each blank to apply a hydraulic pressure to each blank. Each blank material is deformed by hydraulic pressure, pressed against the inner surface of each die, and drawn to obtain a drawn part to be obtained.

When the drawing is completed, the hydraulic pressure is released, and the first forming die, the first drawn part (a blank is a drawn part to be obtained), a plate, and a second drawn part (the blank is a blank). The pressurized state between the second molding die is released, and the first molding die (the second molding die) is released.
The mold (or both) may be moved to remove the drawn parts and complete the operation.

Alternatively, the plate is replaced with a supply port member to obtain a drawn part in the same manner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment (hereinafter simply referred to as a first embodiment) relating to draw forming in the first half of the present invention .
This will be described with reference to FIG. 1 is a first mold, 3 is a first die provided on the first mold 1, 2 is a second mold, 4 is a second mold.
This is a second die provided on the molding die 2. Reference numeral 7 denotes a second blank material placed on the upper surface of the second mold 2, 6 denotes a plate placed on the upper surface of the second blank material 7, and 5 denotes a first blank material placed on the plate 6.

The first molding die 1 is lowered by a slide of a press machine (not shown), and the first molding die 1 is moved to the second molding die 2 through the first blank material 5, the plate 6, and the second blank material 7. To apply a pressing force necessary for drawing the first and second blank members 5 and 7.

In this state shown in FIG. 2, pressurized fluid supplied from a pressurizing system (not shown)
When the pressurized fluid is discharged from the discharge port 6C through the oil supply port 6A via the flow path 6B and the pressurized fluid is supplied between the plate 6 and the first blank material 5 and the second blank material 7,
The hydraulic pressure acts on the blank material 5 and the second blank material 7, and is pressed against the inner surfaces of the first die 3 and the second die 4, respectively. Thus, the first drawn part 5A and the second drawn part 7A to be obtained are simultaneously drawn.

The first die 3 shown in FIGS. 1 and 2 is divided, and as shown in FIG. 5, only the dice portion is used as the first die 3 and the plate pressing portion is used as the plate pressing member 10.
In some cases, a necessary pressing force of the plate presser may be applied by the fluid pressure cylinder 11.

A second embodiment (hereinafter referred to as a unit second embodiment) of the former half of the present invention relating to drawing will be described with reference to FIG. Reference numeral 21 denotes a first mold, 23 denotes a first die provided on the first mold 21, 22 denotes a second mold, and 24 denotes a second die provided on the second mold 22. 27 is a second blank material placed on the upper surface of the second molding die 22;
Is a supply port member for the pressurized fluid, 25 is a supply port member 26 and the second
This is the first blank material placed on the upper surface of the blank material 27, in which the first blank material 25 and the second blank material 27 are drawn and formed to obtain drawn parts 25A and 27A.

The first molding die 21 is lowered by a slide of a press machine (not shown), and the first molding die 21 is subjected to the second molding via the first blank material 25, the supply port member 26 and the second blank material 27. 1st blank material 2
5. Apply a pressing force necessary for drawing the second blank material 27.

A pressurized fluid supplied from a pressurizing system (not shown) is supplied from the oil supply port 26A of the supply port member 26 via the flow path 26B, and from the discharge port 26C to the first blank 2.
A pressurized fluid is supplied between 5 and the second blank material 27.
Then, a hydraulic pressure acts on the first blank material 25 and the second blank material 27 and is pressed against the inner surfaces of the first die 23 and the second die 24, respectively. As a result, the first drawn part 25A and the second drawn part 27A to be obtained are drawn at the same time, and the primary forming is completed.

In the second embodiment, although not shown, the first blank 25, the supply port member 26 and the second blank 2
7 in a state where the pressurized fluid is prevented from leaking to the outside, and the supply port member 26 is separately held by the first molding die or the second molding die or both to form. Yes, it may be drawn in any case. FIG.
Indicates a case in which both the holding members 29A and 29B hold and mold. Although not shown, there are a case where the first die and the plate holding member are separated as shown in FIG. 5 and pressed to form by a liquid pressure cylinder, and a case where no pressing force is applied without the plate holding member. .

When the drawing is completed in the first embodiment and the second embodiment, the hydraulic pressure of the pressurized fluid is released, and
The first mold 1 is moved to separate both molds, and the drawing operation is completed.

FIG. 3 shows an embodiment relating to addition molding of the present invention.
FIG. The state shown in FIG. 3 is a state in which the primary molding is completed, and the drawing is completed in the first embodiment.
This is a state where the first and second drawn parts 5A and 7A have been obtained. First
A tip end face 8A of a first moving punch 8 provided in a molding die;
Tip surface 9A of second moving punch 9 provided in second molding die
Are held at positions along the inner shape surfaces of the first and second dies 3, 4, respectively.

FIG. 4 is a view showing a state in which the pressing force is applied while the hydraulic pressure when the primary molding is completed is applied.
The moving punch 8 and the second moving punch 9 are connected to the first drawing part 5A.
And the second drawn part 7A are pressed into each other to perform additional molding.

When the additional molding is completed, the first moving punch 8
And the pressing force applied to the second moving punch 9 is released, and at the same time, the hydraulic pressure is released, and the first moving punch 8 and the second moving punch 8 and the second The moving punch 9 is retracted, and at the same time, the first mold 1 is moved to disengage both molds, and the drawing operation is completed.

[0020]

As is apparent from the above description, a drawn part can be formed from a blank material by a die and a liquid pressure without using a punch, so that the mold cost can be reduced. In addition, two drawn parts can be obtained at the same time, and the pressing force of the press machine required at the time of molding may be the same value as that of the conventional counter pressure forming method of obtaining one drawn part. For this reason, the press machine does not need to be large, and the productivity can be doubled.

[Brief description of the drawings]

FIG. 1 is a main cross-sectional view before drawing in an embodiment of the present invention.

FIG. 2 is a main cross-sectional view showing a state where drawing is completed in an embodiment of the present invention.

FIG. 3 is a main cross-sectional view showing a state where primary molding is completed in another embodiment of the present invention.

FIG. 4 is a main cross-sectional view showing a state where additional molding is completed in another embodiment of the present invention.

FIG. 5 is a main cross-sectional view showing a state where primary molding is completed in another embodiment of the present invention.

FIG. 6 is a main cross-sectional view showing a state where primary molding is completed in another embodiment of the present invention.

[Explanation of symbols]

1 is the first mold, 2 is the second mold, 3 is the first die, 4
Is a second die, 5 is a first blank material, 5A is a first drawn part, 6 is a plate, 6A is an oil filler, 6B is a flow path, 7 is a second blank material, 7A is a second drawn part, and 8 is a second drawn part. One moving punch, 8A is the tip surface of the first moving punch 8, 9 is the second moving punch, 9A is the tip surface of the second moving punch 9, 21 is the first molding die, 22 is the second molding die, and 23 is the second molding punch. 1 die, 24 is a second die, 25 is a first blank material, 25A is a first throttle component, 26 is a supply port member, 26A is an oil supply port, 26B is a flow path, 26C is a discharge port, and 27 is a second blank material. , 27A are second drawing parts, and 29A, 29B are holding members.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 26/02 B21D 22/20 B21D 22/26

Claims (2)

(57) [Claims] 1. A drawing part formed by drawing a plate-shaped blank material.
The shape of the drawing part to be obtained
Dies each having a die having an inner shape corresponding to
The first mold and the second mold are placed facing each other,
A plate is provided between the molds, and this plate contains a pressurized fluid
Connection between the supply port and the plurality of discharge ports and between the supply port and the discharge port.
Flow path is provided, and the supply port of this plate is
Connected to a pressurizing system that supplies and discharges
First forming of blank material, plate and second blank material in order
Set between the mold and the second mold, and the first mold or the second mold
Move the mold or both to move the first mold and the second mold
Between the first blank, plate and second blank
For forming parts to be obtained by press machine
A pressing force that acts as the required plate holding force is applied between both molds.
Pressurized fluid supplied from the pressurized system
To the blank material side from the discharge port of
The hydraulic pressure of the pressurized fluid acts on the blank material,
Each of the two blanks is deformed by pressure to form a die
The blank material is pressed and drawn.
In addition to draw forming, draw forming in the first half, that is, primary forming
Followed by one of the first mold and the second mold or
Provided to be able to enter and exit from the inner shape surface of both dies
Push the movable punch into the plate side and draw the first half
Draw forming characterized by additional molding on molded parts
Form. 2. A drawn part formed by drawing a plate-shaped blank material.
The shape of the drawing part to be obtained
Dies each having a die having an inner shape corresponding to
A first mold and a second mold are arranged and provided facing each other.
Blank material, pressurized fluid supply port, discharge port and supply port
A supply port member having a flow path connecting the discharge port, and a second bra.
Ink material is set between the first mold and the second mold,
Move the first mold or the second mold or both,
The first blank material, supply port,
2 Insert the blank material and try to obtain it with a press machine
Force, which is the plate holding force necessary for drawing
Acts between both molds and is supplied from a pressure system
Pressurized fluid is discharged between the blanks through the supply port member
Ri by the Rukoto, of action the fluid pressure of the pressurized fluid in the blank
The two blanks are each deformed by this hydraulic pressure.
And pressed into a die and drawn
In addition to drawing the rank material, the draw forming
After the primary molding, either the first molding die or the second molding die
Accessible from inside surface of one or both dies
Push the movable punch provided to the plate side,
It is characterized in that it is additionally molded on the drawn part in the first half.
Draw forming method.