JPH0780698A - Holder dividing die - Google Patents

Abstract

PURPOSE:To facilitate fitting and dividing of an upper holder and lower holder of the holder dividing die. CONSTITUTION:The die formed by dividably bolting an upper holder 1 exchangeably having a die 3 at its center and a lower holder 5 penetrated and bored with a knock-out pin insertion hole 7 at its center is formed with a recessed line 4 opening at both ends in the diametral direction of the holders on one of the opposite surfaces of the upper holder 1 and the lower holder 5 and is formed with a projecting line 6 fitting tightly to the recessed line 4 at the other surface and arriving at both ends in the diametral direction of the holders. Further, a shaft-like projection 6a is formed on one surface of the opposite surfaces and a hole 4a to be tightly fitted with the shaft-like projection 6a is bored at the other surface. The centers and phases of the upper holder 1 and the lower holder 5 match in the state that the recessed line 4 and the projecting line 6 as well as the projection 6a and the hole 4a are tightly fitted to each other.

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, as shown in FIG. 4, an upper holder (1) having a mold (3) at the center thereof and a lower holder (5) having a knockout pin insertion hole (7) at the center thereof. A holder split die has been proposed in which the bolt is fixed by a bolt (8) so as to be split. This holder split die separates the upper holder (1) when the die (3) reaches the end of its life.
Replace only the mold (3) of the upper holder (1) to replace the holder (1)
(5) has the advantage that it can be used for a long time.

The upper holder (1) and the lower holder (5) are composed of a short cylindrical convex portion (60) and a circular shallow concave portion (40) formed on the opposite surfaces.
Are fitted tightly to prevent misalignment with respect to the shaft center. The diameter of the convex part (60) and the concave part (40) are
There is no choice but to make it larger than the outer diameter of (3).
When mating (40), if it is hollowed out even a little, it will not be able to be pushed in or separated, and it will be necessary to hit the holder with a hammer etc. There is. The present invention provides a holder split die that solves the conventional problems by providing convex and concave lines with which the upper holder and the lower holder are aligned with each other in the axial center by fitting them on the facing surfaces of the upper holder and the lower holder. It is something to do.

[0004]

A holder split die according to the present invention comprises an upper holder (1) having a mold (3) at the center thereof which is replaceable.
And a die in which a lower holder (5) having a knockout pin insertion hole (7) formed through the center thereof is bolted to be separable, one surface of the upper holder (1) and the lower holder (5) facing each other. A concave strip (4) opening at both ends of the holder in the diametrical direction, and a convex strip (6) tightly fitted to the concave strip (4) and reaching both ends of the holder in the diametrical direction. A shaft-like projection (6a) is formed on one surface of the facing surface, and a hole (4a) into which the shaft-like projection (6a) is tightly fitted is formed on the other surface, and a concave line (4) and a convex line (6) are formed. The upper holder with the protrusion (6a) and the hole (4a) closely fitted.
The core and phase of (1) and the lower holder (5) match.

[0005]

[Operation and effect] Since the concave stripes (4) and the convex stripes (6) formed on the opposing surfaces of the upper holder (1) and the lower holder (5) reach both ends of the diameter line of the holder, the concave stripes (4) 4) A ridge on the end side
By inserting the end portion of (6) from an oblique direction and sliding it on the concave line (4), the concave line (4) and the convex line (6) can be smoothly fitted without being hollowed. In the process of fitting the concave part (4) and the convex part (6), the upper holder (1) and the lower holder (5) are aligned by simply fitting the axial projection (6a) and the hole (4a). Easy phase matching. Since there is no catching between the upper holder (1) and the lower holder (5) due to gouging, it is necessary to hit the holder with a hammer etc. to fix the gouging as in the past, and be careful not to damage the holder by hitting. , Can be lost.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, the upper holder (1) has a conical sleeve (2) press-fitted into a conical hole (10) in the central portion, and an upper die (3) is inserted into the sleeve (2). And the lower mold (32) is shrink-fitted. The upper mold (3) has a large hole (31), and the lower mold (3
In 2), a small hole (33) is provided coaxially with the large hole (31). The large hole (31) and the small hole (33) in the embodiment are mold holes for molding a two-stage gear. Replace the molds (3) and (32) together with the sleeve (2). Two screw holes (11) and (11) are formed near the outer circumference of the upper holder (1) on the diameter line L ₁ at positions equidistant from the axis.

The lower holder (5) includes the above upper holder (1).
The bolt insertion hole (51) is opened at the position corresponding to the screw hole (11) in parallel with the shaft center, and the tip of the clamp bolt (not shown) for clamping the die to the die block hits the outer peripheral surface. Forming a face (57).

At the center of the lower holder (5) on the opposing surfaces of the upper holder (1) and the lower holder (5), a bolt insertion hole (51) is formed.
A ridge (6) is formed orthogonally on the diameter line L ₂ passing through (51). The width center of the ridge (6) passes through the axis of the lower holder (5) and reaches both ends of the diameter line of the lower holder (5).
At the center of the upper holder (1), there is formed a concave strip (4) to which the convex strip (6) is tightly fitted. The width center of the groove (4) coincides with the axis of the upper holder (1) and is open at both ends of the diameter line of the upper holder (1). The longitudinal side surfaces (41) (61) of the concave line (4) and the convex line (6) are vertical surfaces.

The protruding height of the ridge (6) is equal to or slightly larger than the depth of the ridge (4). The convex portion (6) and the concave stripe (4) can be formed with high precision by, for example, wire cut electric discharge machining.

A taper shaft-like protrusion (6a) is provided at the center of one end of the ridge (6) of the lower holder (5), and the upper holder (1) is tightly fitted to the shaft-like protrusion (6a). Mating hole (4a) is opened, axial projection (6a) and hole (4a), and convex line (6) and concave line.
Upper holder (1) and lower holder (5) with (4) mated
The axes are aligned and the phases are aligned.

A knockout pin insertion hole (7) is opened through the shaft center of the lower holder (5), and the cross-sectional shape of the knockout pin insertion hole (7) matches that of the lower mold (33). The phases are also the same.

However, the upper holder (1) and the lower holder (5)
The ridges (4) and ridges (6) formed on the facing surfaces of the ridges reach both ends of the diameter line of the holder, so that the end of the ridge (6) should be located on the end side of the ridge (4). By inserting it obliquely and sliding it on the concave line (4), the concave line (4) and the convex line (6) can be smoothly fitted without gouging. Aligning the upper holder (1) and the lower holder (5) by simply fitting the shaft-like projection (6a) and hole (4a) while fitting the concave stripe (4) and convex stripe (6). , Phase adjustment can be done easily.

In the holder split die of the present invention, since the upper holder (1) and the lower holder (5) are not caught by the gouging, there is no need for hitting with a hammer or the like to fix the gouging as in the conventional case. , You can eliminate the damage to the holder by hitting. The concave line (4), the convex line (6), and the shaft-like protrusion (6a) are provided at the positions where the core and the phase of the upper holder (1) and the lower holder (5) are aligned, and the concave line (4) and the convex line (6) Only by fitting the parts (6), it is possible to save the labor of centering.

It should be noted that the protrusion 6a can be a small-diameter shaft, and therefore even if this is a straight shaft, the problem of hollowing as in the case of a conventional large-diameter cylindrical portion does not occur.

FIG. 3 shows another embodiment of the lower holder (5), in which a knockout pin insertion hole (7) is opened in the shaft core, and the lower holder main body (52) is formed with a rear portion having a small diameter. On the other hand, a cylindrical tubular fastening member (53) having a reduced rear portion of the inner hole is covered, and a bolt (8) is inserted into the tubular fastening member (53) to fasten it to the upper holder (1).

Lower holder body (52) and tubular fastening member (53)
The lower holder body (52) is pressed against the upper holder (1) by the engaging step portion (54). The rear end face of the lower holder body (52) (5
(0) slightly protrudes from the rear end surface (55) of the tubular tightening member (53), and the impact of forging is caused by the tubular tightening member (53), and hence the bolt.
It does not act on (8).

In implementing the present invention, even if the upper holder (1) is formed with the convex stripes (6) and the projections (6a) and the lower holder (5) is formed with the concave stripes (4) and the holes (4a), The same effect can be achieved. 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 perspective view showing a state in which an upper holder and a lower holder are separated.

FIG. 2 is a sectional view of a die.

FIG. 3 is a sectional view of a die using a lower holder according to another embodiment.

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

[Explanation of symbols]

 (1) Upper holder (3) Type (4) Recessed strip (5) Lower holder (6) Convex strip (7) Knockout pin insertion hole

Claims (1)

[Claims] 1. A die in which an upper holder (1) having a mold (3) exchangeable in the center and a lower holder (5) having a knockout pin insertion hole (7) formed in the center through a bolt are separably bolted. In this case, a concave strip that is open at both ends in the diametrical direction of the holder is provided on one surface of the upper holder (1) and the lower holder (5) facing each other.
(4), convex ridges (6) tightly fitted to the concave ridges (4) and reaching both ends in the diametrical direction of the holder are formed on the other surface, and the axial projections (6a ), The axial projection (6
A hole (4a) that tightly fits a) is opened, and a concave line (4) and a convex line are formed.
A holder dividing die characterized in that the core and the phase of the upper holder (1) and the lower holder (5) are aligned with each other while the (6) and the protrusion (6a) and the hole (4a) are closely fitted.