JPS62282731A - Drawing die device - Google Patents

Abstract

PURPOSE:To form plural drawing parts having each different depth by one operation, by forming a shallow drawing part by projecting the second punch, on the way for forming a deep drawing part by projecting the first punch from a blank holder, at the time of a descent of a die and the blank holder which have inserted and hole a metallic plate. CONSTITUTION:A blank holder 6 provided with the first punch 5 and the second punch 8 is provided on a bed 4 side, and a die 12 is provided on a ram 11 side. In this state, a metallic plate 17 is inserted and held not only between the die 12 and the blank holder 6, by also between a knockout 13 of the die 12 and the second punch 8. Accordingly, at the time of forming a deep drawing part 1, a wrinkle, a flaw or a tear is not generated on the metallic plate 17. Subsequently, when the drawing part 1 is drawn to a prescribed depth, a drawing part 2 is drawn, two pieces of drawing parts 1, 2 cab be formed by one process of a press, and the productivity is improved.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention provides a method for forming a plurality of drawn portions with different depths in a metal plate by one working operation of a press. The present invention relates to a drawing mold device.

(Prior Art) When forming a plurality of drawn portions with different depths in a metal plate material, the process is generally divided into several steps, and one drawn portion is formed in each step. However, this requires a drawing die for each drawing section, which increases equipment costs and lowers productivity.

Attempts have been made to form a plurality of constricted portions in approximately -1- mode, but doing so may result in wrinkles, scratches, or tears in the metal plate. The reason for this is that when drawing and forming, it is necessary to press almost the entire metal plate material except for the part to be drawn, but if you try to form multiple drawn parts in one process, as shown in Figure 5, Since the heights of the punch 21 for forming a deep drawing part and the punch 22 for forming a shallow drawing part are different, the metal plate material 23 is held between the die 24 and the blank holder 25 and the punch 21 is used to form a deep drawing part.
When forming a deeper drawing part 26, since the punch 22 is sunk into the blank holder 25, it is not possible to hold that part, which may cause wrinkles or scratches. Or it may break.

(Problems to be Solved by the Invention) As described above, when several drawn parts with different depths are drawn in one process, there will be parts where the metal plate cannot be held, and wrinkles will form there. However, there was a problem in that it could be scratched or torn.

Therefore, an object of the present invention is to provide a metal plate with 7M of different depths.
To provide a drawing ring λ without the risk of wrinkles, scratches, or tears on a metal plate when f7 drawn parts are formed in one step.

[Structure of the Invention] (Means for Solving the Problems) The drawing mold device of the present invention forms several drawn portions with different depths in a metal plate, and includes a die,
A blank holder for holding a metal plate material is provided between the die and the blank holder, which moves relative to the die and blank holder holding the metal plate material and protrudes from the blank holder. A first punch for forming a deep drawing part is provided, and during the drawing process by the first punch, it moves relative to the die and the blank holder to protrude from the blank holder, and cooperates with the die to form the drawn part. The present invention is characterized in that a second punch for forming the remaining shallow drawn portion is provided intertwined with the blank holder.

(Function) Since the second punch is provided flush with the blank holder, when forming a deep drawn part with the first punch, the metal plate material is not only attached to the blank holder but also to the second punch.
Since the metal plate is pressed against the die by the punch, the metal plate will not be wrinkled, scratched, or torn.

(Embodiment) An embodiment of the present invention will now be described based on FIGS. 1 to 4. In this example, the metal temporary phase to be drawn is
As shown in FIG. 4, several IU, for example two drawn parts 1 and 2, having different depths are drawn.

In FIG. 1 showing the drawing mold apparatus, 3 is a holder identified on the bed 4 of the press, which includes the drawing part 1.
and 2, a first punch 5 for forming the narrowed part 1 on the deeper side is attached. A blank holder 6 has a hole 6a into which the first punch 5 is fitted, and is disposed on the holder 3 via a cushion pin 7 so as to be movable up and down. Note that the cushion pin 7 is supported by a cushion of a press (not shown). 8 is a second part for forming the shallower drawn part 2 of the drawn parts 1 and 2;
This punch is housed so as to be retractable into the four parts 6b formed in the blank holder 6, and its upper surface is in the same shape as the upper surface of the blank holder 6. A stopper pin 9 is attached to the second punch 8, and this stopper pin 9 is inserted through the blank holder 6 so as to move downwardly and protrudes below the blank holder 6. The length of the downward protrusion of the stopper pin 9 from the blank holder 6 is determined by the distance from the holder 3 when the top surface of the blank holder 6 is flush with the top surface of the first punch 5. The dimensions are set to correspond to the difference in depth between the constricted portions 1 and 2.

On the other hand, 10 is a holder fixed to the ram 11 of the press, and this holder has a die 12 with first and second die holes 12a and 12b formed in the portions corresponding to the first and second punches 5 and 8. is installed. 13 and 14 are first and second knockouts housed in the first and second die holes 12a and 12b so as to be movable downward;
These are constantly urged downward by compression coil springs 15 and 16.

Next, the action of the following structural acid will be explained. First, as shown in FIG. 1, place the metal plate 17 on the blank holder 6.1-;
Then, the die 12 is lowered by the ram 11 of the press. Then, first, the die 12 presses the temporary metal phase 17 against the blank holder 6 and holds it therebetween. Thereafter, the die 12, with the metal plate 17 sandwiched between the die 12 and the blank holder 6, descends integrally with the blank holder 6 against the upward elastic force of a goo cushion (not shown).

Therefore, as shown in FIG. 2, the first punch 5 moves upward relative to the die 12 and the blank holder 6, and the
It protrudes upward while pushing up Knockout 13. As a result, the first punch 5 starts forming the deep drawn portion 1 in the metal plate material 17 in cooperation with the first die hole 12a of the die 12. Forming of the drawing part 1 progresses as the die 12 descends after this, but in this case, the second punch 8 is in a state with the top surface of the blank holder 6, and the metal plate material is knocked out by the second knockout. Since the metal plate material 17 is held between the metal plate material 14 and the metal plate material 14, almost the entirety of the metal plate material 17 is pressed down, and the forming of the drawn part 1 proceeds under this condition, so that "wrinkles" are not formed on the metal plate material. There will be no bending, scratches, or tears. When the constricted part 1 is constricted to a predetermined depth, the stopper pin 9 of the second punch 8, which had been in the four parts 6b of the blank holder 6 and was lowered integrally with the blank holder 6, is moved to the holder 3. comes into contact with. Then, the descent of the second punch 8 is stopped, so that the second punch 8 is moved upward relative to the die 12 and the blank holder 6, which continue to descend, as shown in FIG. move and
The second knockout 1 is inserted from the hole 6b of the blank holder 6.
Protrude upward while pushing up 4. As a result, the second punch 8 starts forming the shallower drawn portion 2 in the metal plate material 17 in cooperation with the second die hole 12b of the die 12. Then, while the die 12 is lowered to the lowest position, both the drawn parts 1 and 2 are formed. In this process, the forming of both the drawn parts 1 and 2 proceeds at the same time,
Since the depth of the constricted portion 2 is about 2 to 3 cm, there is no risk that the portion between the constricted portions 1 and 2 will be pulled too much and break. When the forming of both the drawn parts 1 and 2 is completed as described above, the die 12 is pressed by the ram 11 of the press.
is raised, and the blank holder 6 is accordingly raised by the elastic force of the cushion (not shown). Finally, both the converging parts 1 and 2 are connected to the first and second die holes 1 by the first and second knockouts 13 and 14.
2a and 12b, and the various parts of the drawing die device thus return to their original states as shown in FIG.

According to the above configuration, the two drawing parts 1 and 2 can be formed in one cutting operation of the press, that is, in one step, so productivity is improved and only one drawing mold device is roughly manufactured. Therefore, production costs can be reduced. Moreover, even if the two drawn parts 1 and 2 are formed by one working operation of the press, when forming the frozen side drawn part 1, the metal plate 17 is placed between the die 12 and the blank. Since the metal plate 17 is held not only between the holder 6 but also between the second knockout 13 of the die 12 and the second punch 8, the metal plate 17 may be "wrinkled" or may have straw or tears. The constricted portion 1 can be formed without causing any problems.

In addition, in the above embodiment, the case where one deep drawn part and one shallow drawn part is formed is explained, but it is also possible to form one deep drawn part and two or more shallow drawn parts. It can also be applied when drawing and forming.

Furthermore, in the embodiment described above, the blank holder 6 equipped with the first punch 5 and the second punch was provided on the bed 4 side, and the die 12 was provided on the ram 11 side, but conversely, the first punch 5
The blank holder 6 equipped with the second punch 8 may be provided on the ram 11 side, and the die 12 may be provided on the bed 4 side.The present invention is limited to the embodiments described above and shown in the drawings. Rather, it can be modified as appropriate and widely applied and implemented.

[Effects of the Invention] As explained above, according to the drawing mold device of the present invention,
With one press operation, several drawn parts with different depths can be formed on the metal plate H, improving productivity and keeping mold manufacturing costs low, reducing overall production costs. I can do something. Moreover, even if the drawn parts with different depths are formed by the single-coupling action of the press, when forming the deep drawn part with the first punch, the gold pA stainless steel is not used with the die. Since it can be held not only between the blank holder but also between the die and the second punch, it is possible to perform drawing forming with the first punch while holding down the entire metal plate material, and the metal plate key can have "wrinkles". It has the excellent effect of being able to be molded without causing any distortion, damage, or tearing.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of the entire state before drawing forming, and FIG.
The figure is a view equivalent to Figure 1 showing the state in the middle of drawing forming, Figure 3 is a view equivalent to Figure 1 showing the state at the end of drawing forming, and Figure 4 (
A) and (B) are a front view and a plan view, respectively, showing a drawn metal plate material, and FIG. 5 is a longitudinal sectional side view showing an example of a conventional drawing mold device. In the figure, 1.2 is the drawing part, 4 is the bed of the press, and 5 is the first
, 6 is the blank holder, 8 is the second punch,
9 is a stopper pin, 11 is a press ram, 12 is a die, 13.14 is a first. The second knockout, 17, is a metal plate. Applicant Toshiba Corporation Figure 1 Figure 2

Claims (1)

[Claims] 1. In an apparatus for forming a plurality of drawn parts with different depths in a metal plate material, a die, a blank holder that holds the metal plate material between the die, and the die and blank holder that sandwich the metal plate material. a first punch that moves relatively to the blank holder and projects from the blank holder and forms a deep drawn part of the drawn part by cooperation with a die; a second punch that moves relative to the die and blank holder during drawing forming with the punch, projects from the blank holder, and forms a remaining shallow drawn portion of the drawn portion by cooperation with the die; A drawing mold device comprising: