JPH08182272A - Press molding equipment - Google Patents

Abstract

PURPOSE: To easily take out a work forming a projected portion sticking inwardly from a die. CONSTITUTION: At least an upper portion 12a having a recessed portion 18 for forming a projected portion of a die 12 is provided in a movable manner in the direction separating from a work 28 and in the direction of the work 28 and, when forming the projected portion sticking inwardly to the work 28, an upper die holder 24 descends, and at least the upper portion 12a of the die 12 is pushed by a second pushing member 27 and moves in the direction of the work 28. After forming, by the rise of the upper die holder 24, at least the upper portion 12a of the die 12 moves in the direction separating from the work 28 after being released from a pushing force by the second pushing member 27, thereby eliminating hooking of the die 12 against the projected portion after forming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding apparatus for molding a protrusion projecting inward on a work by pressing.

[0002]

2. Description of the Related Art Conventionally, for example, in a frame of a motor, together with the formation of a ventilation hole 1 as shown in FIG. 4, an inwardly projecting projection 2 for making this ventilation hole 1 drip-proof.
It is provided by molding.

In forming the projecting portion 2, however, the frame 3 is set on the outer periphery of the die provided on the lower mold holder (not shown) of the press, and then the upper mold holder is lowered, The punch provided in the upper die holder moves the punch in the die direction to open the ventilation hole 1 in the frame 3 and form the protrusion 2.

[0004]

However, since the projection 2 molded as described above is located in the projection molding portion (recess) of the die immediately after molding, it can be taken out of the die as it is. First, the frame 3 has to be moved out of the set position and then taken out, resulting in a high cost due to the equipment required therefor and a problem that the production efficiency cannot be increased.

The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is not to increase the equipment for the work having the protrusions formed therein and to reduce the production efficiency,
(EN) Provided is a press forming apparatus which can be taken out.

[0006]

In order to achieve the above object, in a press molding apparatus of the present invention, a lower die holder is provided with a die and a punch, and an upper die holder is provided with a pressing member. Is moved together with the upper die holder to move the punch in the die direction to form a protrusion protruding inward on the work, and at least the protrusion forming portion of the die is provided. The upper part is provided so as to be movable in the work direction and the direction away from the work, and the upper die holder is provided with a second pressing member for moving at least the upper part of the die in the work direction when the die is lowered to raise the upper die holder. At least the upper part of the die is moved in a direction away from the work. In this case, it is preferable that only the upper portion of the die having the protrusion forming portion can be moved, and only the upper portion of the die is moved by lowering and raising the upper die holder.

[0007]

According to the above means, at least the upper portion of the die having the protruding portion forming portion moves toward the work by lowering the upper die holder when forming the inwardly projecting protruding portion on the work, and after forming the upper portion. Since the die holder moves up in the direction away from the work to release the catch of the die on the protrusion, the work can be taken out without being displaced from the set position.

Further, in this case, particularly, in the case where only the upper portion of the die having the projection forming portion is movable and only the upper portion of the die is moved by lowering and raising the upper die holder, the whole die is moved. The force for moving the die is smaller than that for moving the die, and the receiving strength of the work during molding can be sufficiently secured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1, the lower die holder 11
, Which is attached to the lower base of the press (not shown). A die 12 is attached to the center of the upper surface of the lower die holder 11, and the die 12 is composed of an upper portion 12a and a main body portion 12b below the upper portion 12a.

The main body 12b of the die 12 is formed with a vertical hole 13 at the center thereof, and a hole 14 is formed around the hole 13 at an angle α which is closer to the center as it goes downward.
A hole 15 having an angle α is also formed in the upper portion 12a, and the upper portion 12a is provided so as to be movable with respect to the main body portion 12b in the center direction and the outer peripheral direction (left and right in FIG. 1).
Further, between the main body portion 12b and the upper portion 12a, the spring 1 that normally moves the upper portion 12a toward the center side.
6 are provided, and further, the main body portion 12b and the upper portion 1 are provided.
The outer surface of 2a is provided with recesses 17 and 18 as protrusion forming parts.
Is formed.

On the other hand, punch holders 19 are attached to both sides of the die 12 on the upper surface of the lower die holder 11, and the punches 20 are respectively attached to the punch holders 19 in the die 12 direction and in the direction away from the die 12 (see FIG. 1). Left and right)
It is provided to be movable. The punch 20 is formed with a hole 21 at an angle β opposite to the hole 15 in the upper portion 12a of the die 12, and the punch holder 19 is formed with a vertical hole 22. And, in the punch holder 19,
A spring 23 is provided to normally move the punch 20 to a position on the side away from the die 12.

On the other hand, an upper die holder 24 corresponding to the lower die holder 11 is attached to the upper base of the press which moves up and down, and the upper die holder 24 has a main body portion 12b of the die 12 at the center of the lower surface portion. Guide rod 2 corresponding to hole 13
5 is attached, and a first pressing member 26 having an inclined portion 26a having an angle β corresponding to the hole 21 of the punch 20 is attached to the peripheral portion. Further, between the first pressing member 26 and the guide rod 25, a pin-shaped second pressing member 27 is attached at an attachment angle of an angle α corresponding to the hole 15 of the upper portion 12a of the die 12. .

Next, the operation of the above structure will be described. The work 28 shown in FIG. 1 is, for example, a motor frame, is made of metal, and has a cylindrical shape. The work 28 is set on the outer periphery of the die 12 and the press machine is operated. Then, the upper die holder 24 descends together with the upper base (not shown) to cause the first pressing member 26 to enter the hole 21 of the punch 20, and the second pressing member 27 to move to the upper portion 12 of the die 12.
It goes into the hole 15 of a. The first pressing member 26 that has entered
Makes the slope of the angle β contact the slope of the hole 21 and the second pressing member 27 makes the slope of the angle α the hole 15.
Of the same angle .alpha.

In this state, when the upper die holder 24 is further lowered, the punch 20 is pressed by the first pressing member 26 and moved in the direction of the work 28 (direction of the die 12) against the spring force of the spring 23. The upper part 12a of the die 12 is pressed by the second pressing member 27 and moved in the direction of the work 28 (the direction of the punch 20) against the spring force of the spring 16. The upper part 12 of the die 12 moved toward the work 28
a is in contact with the inner surface of the work 28 with the outer surface of the main body 12b of the die 12 aligned, and in this state, as shown in FIGS. 2 and 3, the portion where the punch 20 is in contact with the work 28 is a recess (projection). (Projection part) 17 and 18 to project the inward part of the work 28. At this time, the guide rod 2 is inserted into the hole 13 of the main body portion 12b of the die 12.
5 and the hole 2 of the punch holder 19
The tip of the first pressing member 26 enters 2 and the tip of the second pressing member 27 enters the hole 14 of the main body portion 12b of the die 12.

After the molding, when the upper die holder 24 is raised, the first pressing member 26 and the second pressing member 27 are also raised, and the punch 20 and the die 12 respectively.
Since the pressure on the upper portion 12a of the
The upper portion 12a of the die 12 is moved in the direction away from the work 28 by the spring forces of the spring 23 and the spring 16, respectively, and is returned.

As described above, according to the present configuration, the die 1
The upper portion 12a having the two protruding portion forming portions 8 has the work 28
When the projection 29 that protrudes inward is formed, the upper mold holder 24 moves downward to move toward the work 28, and after the molding, the upper mold holder 24 moves upward to move away from the work 28. It is possible to eliminate the catch of the die 12 on the protrusion 29 later. Therefore, after molding, the work 28 can be taken out as it is without being displaced from the set position by, for example, an ejector mechanism, and the cost can be reduced because the complicated equipment conventionally required for the displacement can be omitted. The production efficiency can be improved.

The die 12 may be moved not only in the upper portion 12a but also in the entire upper portion 12a. However, by moving only the upper portion 12a, the force required for the movement is small and therefore the power is small. The cost can be further reduced because the pressure resistance and the like can be reduced. Further, in this case, since the main body portion 12b of the die is left in a fixed state, it is possible to sufficiently secure the receiving strength of the work 28 at the time of molding as compared with the case where the entire die 12 is moved, and accordingly, the accuracy is high. Can be molded easily.

[0018]

The press molding apparatus of the present invention is as described above, and has the following effects. First, the lower die holder is provided with a die and a punch, the upper die holder is provided with a pressing member, and the pushing member is lowered together with the upper die holder, so that the punch is moved in the die direction, and a work piece is formed. In the one in which the protrusion protruding inward is formed, at least the upper portion of the die having the protrusion forming portion is movably provided in the work direction and in the direction away from the work, and the upper die holder is provided with the above-mentioned structure. By providing a second pressing member that moves at least the upper part of the die in the work direction when descending, and by moving at least the upper part of the die in the direction away from the work when the upper die holder moves up, The formed work can be taken out without increasing the equipment and without lowering the production efficiency, reducing the cost and increasing the production efficiency. Kill.

Secondly, since only the upper portion of the die having the projection forming portion is movable and only the upper portion of the die is moved by lowering and raising the upper die holder, the entire die is moved. Compared to the ones used, less force is required to move the die, the cost can be further reduced, and the work receiving strength at the time of molding can be sufficiently ensured, enabling accurate molding.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the entire molding execution state.

FIG. 3 is a vertical cross-sectional view of a lower die portion in a molding execution state.

FIG. 4 is a perspective view of a conventional product

[Explanation of symbols]

11 is a lower die holder, 12 is a die, 12a is an upper part of the die,
Reference numeral 15 is a hole, 16 is a spring, 17 and 18 are concave portions (projection forming portions), 20 is a punch, 21 is a hole, 24 is an upper die holder, 26 is a first pressing member, 27 is a second pressing member, Two
Reference numeral 8 indicates a work, and 29 indicates a protrusion.

Claims (2)

[Claims] 1. A lower die holder is provided with a die and a punch, an upper die holder is provided with a pressing member, and the pushing member is lowered together with the upper die holder, thereby moving the punch in the die direction, and a work piece. In the one in which a protrusion protruding inward is formed, at least an upper portion having a protrusion forming portion of the die is provided movably in the work direction and a direction away from the work, and the upper die holder A second pressing member for moving at least the upper part of the die in the work direction when descending is provided, and moving at least the upper part of the die in a direction separating from the work when the upper die holder is raised. Press molding equipment. 2. The press according to claim 1, wherein only the upper portion of the die having the projection forming portion is movable, and only the upper portion of the die is moved by lowering and raising the upper die holder. Molding equipment.