JPH07108337A - Split die for holder - Google Patents

Abstract

PURPOSE:To enhance the interchangeability of the parts for holder split dies. CONSTITUTION:The split die consists of an upper holder 1 with a die 3 attached in the center ; a lower holder 5 which is screwed down to the upper holder with a large diameter hole 51 put through in the axial center and with a small diameter hole 52 communicating with the large diameter hole and opening to the opposite surface; and a die receiving block 4 which is closely fitted attachably/detachably to the large diameter hole 51 of the lower holder 5, which is provided with an inserting hole 41 put through for a knockout pin in the axial center, and which is abutted on the lower surface of the die 3 of the upper holder 1. The need of exchanging the upper holder 1 and the lower holder 5 themselves is eliminated by merely exchanging the die 3 of the upper holder 1 and the die receiving block 4 of the lower holder 5 in accordance with the shape of forging/heading parts, and large economic effects are attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for forging / forging for forging / forging nuts and other parts, and more particularly to a die for dividing an upper holder and a lower holder.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As shown in FIG. 4, an upper holder (1) having a mold (3) exchangeable in the center and a lower holder (5) having a knockout pin insertion hole (50) opened in the center are attached by bolts (6). A holder split die that is fixed so as to be split is proposed. This holder split die separates the upper holder (1) and replaces the upper holder (1) mold (3) and lower holder (5) when the mold (3) reaches the end of its life. ) Has the advantage that it can be used for a long time.

Even if the mold (3) is replaced, the upper holder
The economic effect is great if not only (1) but also the lower holder (5) can be used without replacement, but in most cases by replacing the mold (3), a knockout pin for protruding the product from the mold (3).
The shaft diameter and the cross-sectional shape of the shaft of (8) also change, and the shape of the knockout pin insertion hole (50) of the lower holder (5) must be changed accordingly, and the lower holder (5) has compatibility. It was impossible to do so. The present invention clarifies a holder dividing die in which a die receiving block is fitted to a lower holder and the die receiving block is simply replaced, and the lower holder itself does not need to be exchanged.

[0004]

The holder dividing die of the present invention comprises an upper holder (1) having a mold (3) mounted in the center, a large diameter hole (51) and a large diameter hole (51) in the shaft center which are bolted to the upper holder. Bore
A lower holder (5) having a small diameter hole (52) communicating with (51) and opening on the opposite surface, and a large diameter hole (51) of the lower holder (5) are detachably and tightly fitted to form a shaft core. Knockout pin insertion hole (41)
And a mold receiving block (4) which is opened through and contacts the lower surface of the mold (3) of the upper holder (1).

[0005]

[Operation and effect] When the mold (3) is replaced, the bolt (6) is removed, the upper holder (1) and the lower holder (5) are divided, and the mold (3) of the upper holder (1) is replaced. At the same time, the mold receiving block (4) of the lower holder (5) is replaced with one in which the knockout pin (8) which fits the mold (3) is fitted so as to be slidable tightly.

Bolt the upper holder (1) and the lower holder (5)
(6) Stop and insert the knockout pin (8) into the knockout pin insertion hole (41) of the die receiving block (4) to set the holder split die on the die block.

As described above, depending on the shape of the forged and forged parts, the upper holder (1) can be replaced by simply replacing the mold (3) of the upper holder (1) and the mold receiving block (4) of the lower holder (5). ) And the lower holder (5) themselves do not need to be replaced, and the economic effect is great.

Also, the receiving block compared to the lower holder (5)
(4) is small and requires less space for stocking forging tools.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a taper hole (11) and a mold receiving block fitting hole (12) are continuously formed in the center of an upper holder (1). The small diameter side of the tapered hole (11) is the upper holder
There is an opening on the tip surface of (1) and the mold receiving block fitting hole (12) is
The hole diameter of the die receiving block fitting hole (12) opened on the opposite surface of the upper holder (1) is larger than the maximum diameter of the tapered hole (11).

The conical sleeve (2) is press-fitted into the tapered hole (11), and the upper die (3) and the lower die (32) are shrink-fitted or press-fitted into the sleeve (2).

A mold hole (30) is formed in the upper mold (3), and a through hole in which a knockout pin (8) described later slides concentrically with the mold hole (30) in the lower mold (32). (33) has been opened. Lower mold (3
Around the outer circumference of 2), there are multiple air vent grooves (34) along the axial direction.
Has been established.

The sleeve (2) and the lower mold (32) are the upper holders.
It is slightly exposed in the mold receiving block fitting hole (12) of (1).

An air vent hole (13) is formed in the peripheral surface of the upper holder (1) so as to penetrate the boundary between the taper hole (11) and the die receiving block fitting hole (12). On the inner end surface of the upper holder (1), four screw holes (14) and (14) are formed at equal intervals, and one positioning pin hole (15) is provided between the screw holes (14) and (14). ) Has been established.

The lower holder (5) has a shaft core provided with a two-stage hole having a large diameter hole (51) on the inner end side and a small diameter hole (52) on the outer end side. The large diameter hole (51) has the same diameter as the mold receiving block fitting hole (12) of the upper holder (1). The die receiving block (4) is removably fitted in the large diameter hole (51).

The upper holder (1) side of the mold receiving block (4) is slightly longer than the depth a from the inner end surface of the upper holder (1) to the lower mold (32) and extends from the large diameter hole (51). A cylindrical leg portion (40) that is removably fitted in the small diameter hole (52) of the lower holder (5) is provided on the opposite surface. The tubular leg portion (40) is formed to have a length slightly protruding from the small diameter hole (52) of the lower holder (5).

A knockout pin insertion hole (41) is formed in the shaft core of the die receiving block (4). The knockout pin insertion hole (41) is continuous with the through hole (33) of the lower mold (32),
Moreover, it is formed in the same shape as the through hole (33). In the embodiment, the through hole (33) and the knockout pin insertion hole (41) are round holes, but the cross-sectional shape such as polygonal or spline is not specified depending on the shape of the part to be molded.

The lower holder (5) includes the upper holder (1).
A bolt insertion hole (53) is provided at a position facing the screw hole (14), and a phase determining pin (7) is implanted at a position facing the pin hole (15).

Then, align the phase determining pin (7) of the lower holder (5) with the pin hole (15) of the upper holder (1), and
Fix (1) and lower holder (5) with bolts (6).

The upper holder (1) side of the mold receiving block (4) has a depth a from the inner end surface of the upper holder (1) to the lower mold (32).
Since it protrudes from the large-diameter hole (51) slightly longer than that, the mold receiving block (4) has the mold (3) with a slight gap between the opposing end surfaces of the upper holder (1) and the lower holder (5). A).

The knockout pin (8) is slidably fitted into the knockout pin insertion hole (41) of the holder split die, the die is set on the die block (9) of the transfer press, and the material blank is forged and pressed as known. And manufacture parts.

Mold receiving block abutting the lower surface of the mold (3)
The tubular leg (40) of (4) slightly protrudes from the lower holder (5) and hits the pedestal (91) in the die block (9).
The load that acts on the forging and forging is the die receiving block (4).
The pedestal (91) in the die block (9) receives it through, so that the impact of the forging does not act on the lower holder (5) and hence the bolt (8), and the bolt (6) is not damaged or loosened. Can be prevented.

When exchanging the die mold (3), the die is removed from the die block (9), the bolt (6) is removed, the upper holder (1) and the lower holder (5) are divided, and the upper holder ( Replace the mold (3) of 1) and replace the mold receiving block (4) of the lower holder (5).
Is replaced with a knockout pin (8) which fits the mold (3) and which fits tightly and slidably.

Bolt the upper holder (1) and the lower holder (5)
(6) Stop, insert the knockout pin (8) into the knockout pin insertion hole (41) of the die receiving block (4), and set the holder split die again on the die block (9).

As described above, depending on the shape of the forged and forged parts, the upper holder (1) can be replaced by simply replacing the mold (3) of the upper holder (1) and the mold receiving block (4) of the lower holder (5). ) And the lower holder (5) themselves do not need to be replaced, and the economic effect is great.

Also, the receiving block compared to the lower holder (5)
(4) is small and requires less space for stocking forging tools.

FIG. 3 shows an embodiment in which the cylindrical leg portion (40) is omitted from the mold receiving block (4), and in this case also,
At the same time as replacing the mold (3), replace it with a mold receiving block (4) that has a knockout pin insertion hole (41) that can slide and guide a knockout pin that matches the mold.
(1) and the lower holder (5) do not need to be replaced. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a holder split die.

FIG. 2 is a right side view of the above.

FIG. 3 is a sectional view of another embodiment.

FIG. 4 is a perspective view of a conventional example.

[Explanation of symbols]

 (1) Upper holder (3) Mold (4) Mold receiving block (5) Lower holder (41) Knockout pin insertion hole

Claims (1)

[Claims] 1. An upper holder (1) having a mold (3) mounted in the center thereof.
And a large-diameter hole (51) bolted to the upper holder and communicating with the large-diameter hole (51) in the shaft center and a small-diameter hole (52) opening on the opposite surface.
The lower holder (5) that has been opened, and the large diameter hole of the lower holder (5)
Consists of a mold receiving block (4) that is removably tightly fitted to (51) and has a knockout pin insertion hole (41) penetrating the shaft core and abutting against the lower surface of the mold (3) of the upper holder (1). Holder split die.