JP3208955B2 - Drawing 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 drawing apparatus.

[0002]

2. Description of the Related Art As a conventional drawing apparatus, for example, FIG.
(See JP-A-3-71931). Around the punch 51, a blank holder 52 and a floating punch 53 are provided so as to be able to sink.
The blank holder 52 is urged upward by the cushion pin 54, and the floating punch 53 is supported by the tanker cylinder 70. 55 is a stopper for the floating punch 53.

A die 56 is provided above the punch 51 and the blank holder 52 so as to be able to move up and down. Die 56 has
A floating die 58 is mounted via a tanker cylinder 57, and the floating die 58 faces the floating punch 53. 59 is a floating die
Keeper that regulates 58 down movement, 60 is a floating die
It is a stopper that regulates the upward movement of 58.

An in-mold locking cylinder 61 is provided in a part of the blank holder 52 in a horizontal direction. The in-mold locking block 62 which moves back and forth by the cylinder 61 forms a part of the blank holder 52 and the floating die 58. You can move in and out of some places. Here, the panel P is loaded at the top dead center position of the die 56, and the die face (blank holder 52 and floating punch 53)
Placed horizontally on top of

[0005] As the die 56 descends, the die 56 holds the panel P between itself and the blank holder 52, and the floating die 58 holds the panel P between itself and the floating punch 53. By the lowering of the subsequent die 56, the die 56 is sunk against the blank holder 52 to the cushion pins 54,
In addition, floating die 58 is floating punch 53
Sinks against the tanker cylinder 70. When the upper surfaces of the punch 51, the blank holder 52, and the floating punch 53 are flush with each other, the floating punch 53 hits a stopper 55 on the punch 51 side and becomes a stroke end, and does not sink any further. Since there is enough room, narrowing down starts from here.

[0006] At the bottom dead center, the blank 56 is lowered by the cushion stroke due to the downward movement of the die 56, the panel P is squeezed as shown in the figure, and the molding is completed.
At this time, due to the forward movement of the in-mold locking cylinder 61, the in-mold locking block 62 enters between the blank holder 52 and the floating die 58 (in-mold locking).

Next, as the die 56 is raised, the blank holder 52 is raised by the cushion pins 54, and as the blank holder 52 is raised, the floating die 58 is raised via the in-mold locking block 62. Then, the die 56 is separated from the blank holder 52 by the subsequent ascent of the die 56 after the cushion pin 54 completes the cushion-up of the blank holder 52, and the panel P is released.

[0008] In terms of the features of the draw forming apparatus described above, a part of the die face is divided from another part so as not to perform drawing on a part of the die face in order to improve the yield. That is, the die face is divided into a blank holder 52 and a floating punch 53. And, in relation to this, the part facing the floating punch 53 of the upper die is divided from the die 56 into a floating die 58, and when the blank holder 52 is cushioned up, the floating die 58 is raised in accordance with this. An inner locking mechanism (61, 62) is provided. In order to form a bead on the die face, tankers 70 and 57 are used as pressure sources for the floating punch 53 and the floating die 58.

[0009]

However, in such a conventional drawing apparatus, the die face is divided into a blank holder portion and a floating punch portion, and the pressure source of the blank holder is a cushion pin.
Since the pressure source of the floating punch is a tanker cylinder, there is a difference in the pressing force between the cushion pin and the tanker cylinder, and there is a problem that adjustment during molding is difficult.

Further, there is a problem that a difference in reaction force between the cushion pin and the tanker cylinder is generated, and the device is tilted, thereby changing a molding state. The present invention has been made in view of the above-described conventional problems, and has as its object to provide a drawing apparatus capable of eliminating a difference in pressing force between a blank holder and a floating punch.

[0011]

Therefore, the present invention provides a punch, a blank holder provided so as to be able to sink around the punch, and a blank holder which is able to sink into a part around the punch. A floating punch provided , a stopper for regulating the sinking of the floating punch in the middle, a die capable of ascending and descending facing the punch and the blank holder, and the floating supported by a part of the die via a tanker cylinder. The draw forming apparatus, comprising: a floating die facing a punch; and an in-mold locking mechanism that raises the floating die as the blank holder is raised.
Gives a reaction force to the rank holder when it sinks
A cushion for urging the blank holder upward
While the pins are provided, the floating punch is
Until subduction is regulated by the topper,
Of the blank holder against the blanking punch
So as to give the same reaction force as
To abut the cushion pin and urge the cushion pin upward.
It is characterized in that

[0012]

In the above configuration, since the same cushion pin as that of the blank holder is used as the pressure source of the floating punch, molding can be performed with the same pressing force.

[0013]

An embodiment of the present invention will be described below. FIG. 1 is a vertical sectional view of the drawing apparatus at a position of 0 ° (top dead center). FIG. 8 is a plan view of the lower mold, and FIG. 9 is a plan view of the upper mold. A blank holder 2 and a floating punch 3 are provided around the punch 1 so as to be able to sink. Both the blank holder 2 and the floating punch 3
The upper surfaces thereof are urged upward by the cushion pins 4, and their upper surfaces are flush with each other at a position higher than the upper surface of the punch 1.
A stopper 5 is provided on the punch 1 side so as to lock the floating punch 3 during the cushion stroke of the cushion pin 4.

A die 6 is provided above the punch 1 and the blank holder 2 so as to be able to move up and down by a crank (not shown).
° (0 °). The floating die 8 is attached to the die 6 via a tanker cylinder 7 arranged in a vertical direction.
The floating die 8 is opposed to the floating punch 3. Die 6 also has
A keeper 9 for regulating the downward movement of the floating die 8,
A stopper 10 for regulating the upward movement of the floating die 8 is attached. At the 0 ° position, the floating die 8 is locked by the keeper 9.

As an in-mold locking mechanism, an in-mold locking cylinder 11 is provided in a part of the blank holder 2 in a horizontal direction. It can move back and forth between the part and a part of the floating die 8. Although the in-mold locking block 12 is shown at the forward position in FIG. 1, it moves backward at 0 °.

Next, the operation will be described with reference to FIGS. At a position of 0 ° (top dead center) in FIG. 1, the panel P is loaded, and is placed horizontally on the die face (blank holder 2 and floating punch 3). FIG. 2 shows that at the position of 145 °, the die 6 is
And the floating die 8 holds the panel P between the floating punch 3 (blank hold). At this time, the reaction force of the cushion pin 4 causes the blank holder 2 and the floating punch 3
And bead forming power.

FIG. 3 shows that the die 6 lowers the blank holder 2 against the cushion pin 4 by lowering the die 6 at a position of 153 °, and the floating die 8 moves the floating punch 3 to the cushion pin 4. Submerge against it. At this time, the upper surfaces of the punch 1, the blank holder 2, and the floating punch 3 are flush with each other, and the panel P contacts the upper surface of the punch 1. Then, the floating punch 3 hits the stopper 5 on the punch 1 side and reaches the stroke end, and does not sink further. However, since the blank holder 2 has a margin up to the cushion stroke, narrowing starts from here.

At this time, the in-mold locking cylinder 11 starts to move forward. FIG. 4 shows the position of 180 ° (bottom dead center), the blank holder 2 sinks by the cushion stroke due to the downward movement of the die 6, the panel P is squeezed, and the die 6 is moved to the panel on the punch 1. Then, the panel P is completed by being brought into contact with P. Since the floating punch 3 is locked by the stopper 5, it does not sink and the stroke of the floating punch 3 and the blank holder 2
Of the stroke (cushion stroke)
The floating punch 3 and the cushion pin 4 are separated. Further, since the floating punch 3 is locked, the floating die 8 does not descend while holding the panel P therebetween, and the tanker cylinder 7 is compressed. As a result,
Floating die 8 stops from keeper 9
Contact 10

At this time, due to the forward movement of the in-mold locking cylinder 11, the in-mold locking block 12 enters between the blank holder 2 and the floating die 8 (in-mold locking). Figure 5 is a position of 207 °, by an increase in the die 6, the die 6 is moved away from the punch 1, increase in the die 6 rises blank holder 2 by the cushion pin 4, with the increase of the blank holder 2 The floating die 8 rises via the in-mold locking block 12 and moves away from the floating punch 3. At this time,
Although the floating punch 3 does not rise yet, the cushion pin 4 comes into contact with the floating punch 3.

When the in-mold locking is performed, the panel P is deformed if the panel P is held between the floating die 8 and the floating punch 3. Therefore, it is necessary to raise the plotting die 8. Because. FIG. 6 shows a state in which the blank holder 2 is raised by the cushion pin 4 due to the rise of the die 6 at the position of 215 ° (when the cushion-up is completed). Then, the floating die 8 moves up. The floating punch 3 is also raised by the cushion pin 4. At this time, the cushion-up by the cushion pins 4 is completed, and the blank holder 2 and the floating punch 3 do not further rise.

FIG. 7 shows that the panel 6 is released at a position of 225 ° by lifting the die 6 away from the blank holder 2 at the stroke end. Also,
Since the blank holder 2 has not risen, the floating die 8 is locked to the keeper 9 by the extension of the tanker cylinder 7 by the rise of the die 6. As the die 6 continues to rise, it returns to the 0 ° (top dead center) position shown in FIG. 1, and the in-mold locking cylinder 11 retreats. In this state, the molded panel P is taken out, and the panel P to be molded next is loaded.

[0022]

As described above, according to the present invention, since the same cushion pin as that of the blank holder is used as the pressure source for the floating punch, molding can be performed with the same pressing force, and the pressing force can be applied to the entire die face. Becomes uniform.
Therefore, it is not necessary to adjust the pressing force for each of the blank holder and the floating punch. Also,
Since the blank holder and the floating punch move up and down with the same cushion pin, the eccentric load is not applied to the reaction force to the device, and the device is stabilized.

[Brief description of the drawings]

FIG. 1 shows an example of 0 ° of a draw forming apparatus showing one embodiment of the present invention.
Longitudinal section at position

FIG. 2 is a longitudinal sectional view of the same device at a 145 ° position.

FIG. 3 is a longitudinal sectional view of the same device at a position of 153 °.

FIG. 4 is a longitudinal sectional view of the same device at a 180 ° position.

FIG. 5 is a longitudinal sectional view of the same device at a position of 207 °.

FIG. 6 is a longitudinal sectional view of the same device at a position of 215 °.

FIG. 7 is a longitudinal sectional view of the same device at a position of 225 °.

FIG. 8 is a plan view of a lower die of the above device.

FIG. 9 is a plan view of the upper die of the above device.

FIG. 10 is a longitudinal sectional view of a draw forming apparatus showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch 2 Blank holder 3 Floating punch 4 Cushion pin 5 Stopper 6 Die 7 Tanker cylinder 8 Floating die 9 Keeper 10 Stopper 11 In-mold locking cylinder 12 In-mold locking block

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-71931 (JP, A) JP-A-6-328157 (JP, A) JP-A-59-220228 (JP, A) 108919 (JP, U) Japanese Utility Model 232319 (JP, U) Japanese Utility Model 63-145519 (JP, U) Japanese Utility Model Application 62-183927 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21D 24/00-24/16

Claims (1)

(57) [Claims] 1. A punch, a blank holder provided so as to be able to sink around the punch, a floating punch provided so as to be able to sink a part around the punch, and a sinking of the floating punch in the middle. A stopper for regulating, a vertically movable die facing the punch and the blank holder, a floating die supported by a part of the die via a tanker cylinder and facing the floating punch, An in-mold locking mechanism for raising the floating die together with the drawing die.
A reaction force is applied to the blank holder when it sinks.
So that the blank holder can be urged upward.
The floating punch is sunk by the stopper while the
Until the floating punch is regulated.
And applies the same reaction force to the blank holder.
The floating punch into the cushion
It is configured to be biased upward by contacting the
Draw forming equipment.