JP2001321875A - Forging die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forging die device, by which defective shapes of a product can be eliminated. SOLUTION: This forging die device comprises an upper punch 1 and a lower die pin 2. It further comprises a die 3 externally provided on an upper end side of the die pin 2 in a housing manner and having a hole 4 capable of inserting a lower end of the punch 1 therein, and the die has an upper die 16 and a lower die 17 which are split in the vertical direction. In addition, a pressing plate 10 externally housed over the punch 1 in a vertically slidable manner and a load generating mechanism E to apply the downward load to the pressing plate 10 are provided, and the lower surface of the upper die 16 is pressed against the upper surface of the lower die 17 buy allowing the pressing plate 10 to press an upper surface 16a of the upper die 16 during the forging when the punch 1 is advanced into the hold 4 in the die 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a forging die apparatus.

[0002]

2. Description of the Related Art FIG. 5 shows a die c having an upper punch a, a lower die pin b, and a hole g which is provided on the upper end side of the die pin b so as to be externally fitted and into which the lower end of the punch a can be inserted.
And a conventional forging die apparatus comprising: In forging, a portion to which a large force is applied concentrates stress, and an unexpected portion may be damaged due to the stress concentration. Therefore, the die c is divided into an upper die d and a lower die e which can be divided into upper and lower parts. And an outer peripheral die f for external fitting and holding.

[0003]

However, as shown in FIGS. 5 and 6, during the forging process in which the punch a enters the hole g of the die c, the molding pressure is high or the die rigidity is low. When the die c and peripheral components are distorted (deformed) by the downward pressure due to the pressure, a gap h is formed between the upper die d and the lower die e, and the molding material i enters the gap h to form a burr j. There is a problem that the molded product has a defective shape.

Accordingly, an object of the present invention is to provide a forging die apparatus capable of eliminating a defective shape of a molded product.

[0005]

In order to achieve the above-mentioned object, a forging die apparatus according to the present invention comprises an upper punch and a lower die pin, and is externally fitted to an upper end of the die pin. A die having a hole through which a lower end of the punch can be inserted and provided in a forging die apparatus having an upper die and a lower die which can be divided into upper and lower portions, so that the die can be slid up and down on the punch. A pressure plate to be fitted outside,
A load generating mechanism for applying a downward pressing load to the pressing plate, and a forging process in which the punch enters the hole of the die, the pressing plate presses the upper surface of the upper die, The lower surface of the upper die is pressed against the upper surface of the lower die.

At this time, the load generating mechanism is made of a metal spring. Alternatively, the load generating mechanism may be composed of a hydraulic pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a forging die apparatus according to the present invention. This forging die apparatus is provided with an upper punch 1
And a die 3 having a hole 4 into which the lower end of the punch 1 can be inserted.

More specifically, reference numeral 5 denotes a punch plate attached to the lower surface of the movable portion 6 of the press, and reference numeral 7 denotes a die plate attached to the upper surface of the fixed portion 8 of the press. The die pin 2 penetrates the die plate 7 and is fixed to the upper surface of the fixing portion 8.

On the lower surface of the punch plate 5, a punch holder 9 for holding the punch 1 facing the die pin 2 is fixed, and a pressing plate 10 is fitted on the punch 1 so as to be slidable up and down. . The pressure plate 10
It has a central hole through which the punch 1 is inserted, a contact step 11 at the center of the lower surface, and a notched peripheral groove 12 at the lower end of the outer peripheral surface.

Further, a pressure plate holder 13 is externally fitted integrally with the punch holder 9. The pressure plate holder 13 has an inner flange portion 14 at the lower end edge thereof, which fits into the cutout peripheral groove 12 of the pressure plate 10, and the pressure plate 10 is mounted on the inner flange portion 14. It is externally held by the holder 13.

Between the punch holder 9 and the pressure plate 10, a load generating mechanism E for applying a downward pressure load to the pressure plate 10 is provided. The load generating mechanism E includes a metal spring 24 such as a coil spring or a disc spring. In the present embodiment, a case where a plurality of metal springs 24 are arranged symmetrically around the punch 1 is illustrated. In this case, recesses are formed in the lower surface of the punch holder 9 and the upper surface of the pressure plate 10 for fitting and fixing the ends of the metal springs 24.

On the other hand, a spacer 15 having a hole through which the die pin 2 is inserted is provided on the upper surface of the die plate 7, and a die 3 is provided on the upper surface of the spacer 15. This die 3 is divided into upper die 16 and lower die
17 and an outer peripheral die 18 for externally holding the upper die 16 and the lower die 17.

The lower die 17 has a hole having an inner diameter substantially equal to the outer diameter of the die pin 2. Upper die approximately equal to outer diameter of lower die 17
16 has a notch peripheral groove 19 formed at the upper end of the outer peripheral surface and a hole having an inner diameter substantially equal to the outer diameter of the punch 1 larger than the outer diameter of the die pin 2. The holes of the upper die 16 and the lower die 17 communicate with each other to form the hole 4 of the die 3. Further, the outer peripheral die 18 having an outer diameter substantially equal to the outer diameter of the spacer 15,
At the upper end of the inner peripheral surface, there is provided an inner flange portion 20 to be fitted with the notched peripheral groove 19, and at the upper end of the outer peripheral surface, a notched peripheral groove 21 is formed.

The die 3 is, as shown in FIG.
The upper surface of the outer peripheral die 18 is the same as the upper surface of the die 16a.
It does not have to be on the same plane. In the drawing, the outer diameter of the upper surface 16a of the upper die 16 is set to be substantially equal to the outer diameter of the lower surface 11a of the contact step portion 11 of the pressure plate 10, but the outer diameter may be different. Be free.

Next, the operation and action of the forging die apparatus of the present invention will be described. As shown in FIG. 1, first, a columnar molding material 30 is placed in the hole 4 (blank) of the die 3.
Then, as shown in FIG. 2 and FIG.
Is lowered, the punch 1 enters the hole 4 of the die 3 (as indicated by an arrow A), presses the molding material 30 and forms the material into a predetermined shape. At this time, the lower surface 11a of the contact step portion 11 of the pressure plate 10 to which the downward pressure load is applied by the load generating mechanism E contacts the upper surface 16a of the upper die 16 of the die 3 (vector (As in G), whereby the lower surface 16b of the upper die 16 presses against the upper surface 17a of the lower die 17.

At the time of forging, the descending punch 1
When the molding material 30 is pressed and plastically deforms into a T-shaped vertical cross section, thereby applying a large load to the lower die 17, the lower die 17 may be slightly compressed and deformed downward. Since the die 16 is pressed against the lower die 17 by pressing the vector G with a pressing load (the upper die 16 follows the lower die 17), the lower surface 16b of the upper die 16 and the upper surface 17a of the lower die 17 are in contact with each other. There is no gap between them. Therefore, the molding material 30 does not enter between the upper die 16 and the lower die 17 to generate burrs, and the molded product has no shape defect.

Note that the pressure generating plate E
The pressurized load value (G) applied to 10 can be changed according to the type of the metal spring 24 to be used, and corresponds to the structure of the die 3 and the shape of the molded product.

FIG. 4 shows another embodiment of the forging die apparatus of the present invention. In this forging die apparatus, the load generating mechanism E is hydraulic. That is, seal materials 26 and 27 are provided on the inner and outer peripheral surfaces of the punch holder 9, and seal materials 26 and 27 are provided on the inner and outer peripheral surfaces of the pressure plate 10, so that the punch 1, the punch holder 9 and the pressure plate holder 13 are provided. The oil 25 is stored in a sealed space formed by the pressure plate 10 and the pressure plate 10.

Therefore, at the time of forging, the pressure plate 10 to which a downward pressure load (G) is applied by hydraulic pressure presses the upper surface 16a of the upper die 16 (see FIG. 3). At this time, a slight gas component in the closed space is compressed, and the minute movement of the pressure plate 10 toward the punch holder 9 is allowed.

The present invention is not limited to the above-described embodiment. For example, the load generating mechanism E is constituted by interposing a hard rubber or a gas cylinder between the punch holder 9 and the pressure plate 10. You may do it. Further, the forging die apparatus is not affected by the mechanism of the press machine, and therefore can be applied to various press machines.

[0022]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect, at the time of forging the punch 1 enters the hole 4 of the die 3, a load generating mechanism E is provided.
Since the pressing plate 10 to which the pressing load G is applied presses the upper surface 16a of the upper die 16 of the die 3, even if the lower die 17 is compressed and deformed by the downward pressure, the upper die 16 follows the compression deformation. The press-contact state with the die 17 can be maintained, and there is no gap between the lower surface 16b of the upper die 16 and the upper surface 17a of the lower die 17. Therefore, the molding material 30 does not enter the gap between the upper die 16 and the lower die 17 to generate burrs, and the molded product has no defective shape.

(According to claim 2) The structure of the load generating mechanism E is simple and can be easily manufactured. According to the third aspect, the structure of the load generating mechanism E is simple and can be easily manufactured. Further, it is easy to set a large pressing load.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing one embodiment of a forging die apparatus according to the present invention.

FIG. 2 is a sectional front view showing a forged state.

FIG. 3 is an enlarged sectional view of a main part showing a forged state.

FIG. 4 is a fragmentary sectional front view showing another embodiment of the present invention.

FIG. 5 is a cross-sectional front view of a main portion showing a conventional forging state.

FIG. 6 is an enlarged sectional view of a main part.

[Explanation of symbols]

 Reference Signs List 1 punch 2 die pin 3 die 4 hole 10 pressure plate 16 upper die 16a upper surface 16b lower surface 17 lower die 17a upper surface 24 metal spring E load generating mechanism G pressure load

Claims (3)

[Claims] 1. A die comprising an upper punch and a lower die pin, and a die which is provided on the upper end side of the die pin so as to be externally fitted and has a hole through which a lower end of the punch can be inserted. In a forging die apparatus having an upper die and a lower die that can be divided into upper and lower parts, a pressing plate externally slidably fitted to the punch and a load for applying a downward pressing load to the pressing plate And a generating mechanism, wherein during forging the punch enters the hole of the die, the pressing plate presses the upper surface of the upper die to press the lower surface of the upper die against the upper surface of the lower die. A forging die apparatus characterized in that: 2. The forging die apparatus according to claim 1, wherein the load generating mechanism comprises a metal spring. 3. The load generating mechanism comprises a hydraulic pressure.
The forging die apparatus as described.