JPH057925A - Extruding device for forming large-sized hollow die stock - Google Patents

Abstract

PURPOSE:To execute such extrusion forming as a failure of a stock leakage, etc., is not generated by allowing an annular deposition chamber and a container billet hole to communicate with each other by plural port holes. CONSTITUTION:A conical recessed part 10 of a size roughly corresponding to a container billet hole 1a is provided in the center part on the rear end face of a male die 4. On the conical face of this recessed part 10, a circular extruding stock inflow port 11 is provided at an equal interval in the peripheral direction. On the front end face of the periphery of a forming projecting part 7 of the male die 4, an extruding stock outflow port 12 is provided at an equal interval in the peripheral direction. The extruding stock outflow port 12 is formed a little longer in its peripheral direction in an annular deposition chamber 9. Each stock inflow port 11 and each stock outflow port 12 are allowed to communicate with each other by a straight port hole 13 pierced with a drill in a state inclined to the outside to the front in the extruding direction. In the course of extrusion, back pressure to the male die 4 is suppressed small. Therefore, it does not occur that the extruding stock intrudes from between the male die 4 and the female die 3, and between a container 1 and the male die 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion processing apparatus for extruding a large hollow metal material such as aluminum, for example, a circular tube having a diameter larger than the billet hole of a container.

[0002]

2. Description of the Related Art For example, extrusion molding of a circular pipe (E) having a diameter larger than that of a billet hole (51a) of a container (51) is conventionally performed as shown in FIGS. , A metal flow adjusting mold (53) having a material-conducting hole (53a) between the container (51) and the male die (52) whose diameter is gradually increased toward the male (52) side. ) Was placed using an extrusion processing apparatus.

[0003]

However, in the above extrusion processing apparatus, the larger the size of the mold material to be molded, the larger the angle of inclination of the material passage hole (53a) of the flow adjusting mold (53). The back pressure due to the billet metal acts on the flow adjustment mold (53) to a great extent, and as a result, the flow adjustment mold (53) and the die male mold become larger. There was a risk that billet metal would enter between (52) and cause major trouble.

In view of the above technical background, an object of the present invention is to provide an extrusion processing apparatus capable of extruding a large hollow mold material without causing problems such as material leakage as described above.

[0005]

To achieve the above object, the present invention provides a female mold having a molding hole for molding an outer peripheral portion of a mold material,
An extrusion hollanderice in which a male mold having a molding convex portion for molding a hollow part of the molding material is combined to form a large-sized annular molding gap with respect to the container billet hole between the molding hole and the molding convex portion. And a container billet hole provided adjacent to the rear part of the annular molding gap are communicated with each other by a plurality of male-type port holes inclined outward toward the front in the extrusion direction. The gist is an extrusion processing apparatus for molding a large hollow material, which is characterized in that

In the above description, "a large-sized annular molding gap with respect to the container billet hole" includes not only the case where the size of the circular circumscribed circle of the annular molding gap is larger than the container billet hole, but also the container billet. It is used in the meaning including the case where it is almost the same as the hole but slightly smaller than it.

[0007]

In the above structure, the extruded material in the container billet hole is divided and flows into each male port hole, while being displaced outward in each port hole along the inclination direction of the port hole. As it flows forward, it flows into the annular welding chamber and is welded to each other, and passes through the annular forming gap to be formed into a large hollow mold member.

[0008]

EXAMPLE Next, an example in which the present invention is applied to an extrusion processing apparatus for forming a large-sized aluminum circular tube having a diameter larger than the diameter of the billet hole of a container will be described. The present invention can be applied not only to the extrusion of a large circular tube having the same diameter as the billet hole of the container but a little smaller than that, but is not limited to the circular tube, and various other shapes such as flat tubes. It goes without saying that the cross-section circumscribed circle of the pipe can be widely applied to an extrusion processing device for extruding a large hollow material whose diameter is larger than, or equivalent to, slightly smaller than the diameter of the billet hole of the container. .

In the extrusion processing apparatus shown in FIG. 1 and FIG. 2, (1) is a container, and (2) is an extrusion hollow rice.

The Hollodry (2) is a combination of a female mold (3) and a male mold (4). In the female mold (3),
A recess for the welding chamber (5) is provided on the rear end face, and
A molding hole (6) having a diameter larger than that of the billet hole (1a) of the container (1) is provided in the center of the welding recess (5). On the other hand, the male mold (4) is provided with a molding projection (7) having a diameter larger than that of the container billet hole (1a) and smaller than that of the female molding hole (6) so as to project forward. There is. By combining the male and female molds (3) and (4), a large circular pipe with a larger diameter than the container billet hole (1a) between the molding hole (6) and the molding protrusion (7). Forming an annular molding gap (8) for molding the male mold (4)
An annular welding chamber (9) is formed between the mold and the female mold (3).

At the center of the rear end surface of the male die (4), a conical recess (10) having a size substantially corresponding to the container billet hole (1a) is provided. Five circular extrusion material inlets (11) are provided in the conical surface of the recess (10) at equal intervals in the circumferential direction, and the rear surface of the male die (4) is located at the front end of the container (1). All of these extruded material inlets (11) are arranged within the outer peripheral line of the cross section of the container billet hole (1a) in the state of being brought into contact with the surface.

On the other hand, on the front end face around the molding convex portion (7) of the male die (4), the material inlet (11) is approximately in phase with the extruded material outlet (12) in the circumferential direction or the like. It is provided at intervals. The extruded material outlet (12) has a cross-sectional area larger than that of the material inlet (11). In order to increase the cross-sectional area in this way, the extrusion material outlet (12) is formed in the welding chamber (9) to be long in the circumferential direction.

A straight port hole (13) formed by drilling each material inflow port (11) and each material outflow port (12) so as to be inclined outward toward the front in the extrusion direction. It is said to have been communicated with. Since the material inlet port (11) communicates with the material outlet port (12) having a larger cross-sectional area than this, the drilling angle is slightly different from the material inlet port (11) in the circumferential direction. Then, each material outlet (12) is formed in the shape of ∞.

In the extrusion processing apparatus having the above-mentioned structure, the container (1) is loaded with the aluminum billet (B), and the container (1) is held in a state of being pressed against the rear end surface of the die (2). When the billet (B) is pressurized from the rear with a stem that does not exist, the billet metal flows into each port hole (13) through each material inlet (11), and the billet metal is radially outward due to the inclination of the port hole (13). While being displaced in one direction, it moves toward the front in the extrusion direction, that is, toward the welding chamber (9). Then, these metals flow out of the material outlets (12) into the welding chamber (9), are welded to each other there, pass through the annular molding gap (8), and have a diameter larger than that of the container billet hole (1a). It is extruded into a large-sized circular pipe mold material (E).

Since the container billet hole (1a) and the die welding chamber (9) are communicated with each other through the plurality of outwardly inclined port holes (13), during the extrusion, The back pressure on the male mold (4) is kept low, so that the extruded material is placed between the male mold (4) and the female mold (3), between the container (1) and the male mold (4), etc. No invasion occurs from any of the intervals.

Further, a conical recess (10) is formed in the center of the rear end surface of the male die (4), and the material inlet (11) is provided on the conical surface thereof. The extrusion pressure acting on the rear end of the male die (4) is dispersed radially outward to reduce the pressure acting in the extrusion direction, and the male die (4) can withstand a stronger extrusion pressure than before. In addition to what can be done, intrusion of the extruded material between the male mold (4) and the container (1) can be suppressed more effectively.

Furthermore, each of the outlets (13) of the extruded material has a larger cross-sectional area than each of the inlets (11), and each outlet (13) is ∞.
Since the distance between the same outlets (13) is narrowed, the crimping of the billet metals in the welding chamber (9) can be realized without any trouble.

[0018]

As described above, in the extrusion processing apparatus of the present invention, the annular welding chamber and the container billet hole are communicated with each other by a plurality of male type port holes inclined outward toward the front in the extrusion direction. Therefore, a large hollow material is inserted into the container billet hole to prevent the extruded material from entering the container and the die, between the male mold and the female mold, etc. It is possible to perform molding, and it is possible to realize extrusion molding of a hollow mold material that is larger than the conventional one for the container billet hole.

[Brief description of drawings]

1 shows an extrusion processing apparatus according to an embodiment, FIG. 1 (a) is a vertical sectional view of the apparatus, and FIG. 1 (b) is a rear end view of a die.

FIG. 2 is a perspective view showing the extrusion processing apparatus according to the embodiment in a disassembled state.

3A and 3B show an extrusion processing apparatus according to a conventional example, wherein FIG. 3A is a vertical sectional view and FIG. 3B is a view taken along the line III-III in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 1a ... Billet hole 2 ... Hollow chair 3 ... Female mold 4 ... Male mold 6 ... Molding hole 7 ... Molding convex part 8 ... Molding gap 9 ... Welding chamber 13 ... Port hole E ... Circular pipe (large hollow mold material)

Claims (1)

Claim: What is claimed is: 1. A molding die having a molding hole for molding an outer peripheral portion of a molding material and a male mold having a molding convex portion for molding a hollow portion of the molding material are combined to form a molding hole and a molding material. An extrusion hollow chair having a large-sized annular molding gap is formed between the convex portion and the container billet hole, and an annular welding chamber and a container billet hole are provided adjacent to the rear portion of the annular molding gap. Is communicated by a plurality of male-type port holes that are inclined outward toward the front in the extrusion direction.