JPH0655329B2 - Extrusion processing equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion processing apparatus, and more particularly to an extrusion processing apparatus for direct extrusion used for extrusion molding of a metal material such as an aluminum material.

2. Description of the Related Art Generally, as shown in FIG. 3, in this type of direct extrusion processing apparatus, an extrusion tool (50) having a diameter larger than the diameter of the billet hole (52) of the container (51) is installed in the container (51). The billet (53) loaded in the billet hole (52) is placed on the stem (54) through the dummy block (57) at the front end (right side in the figure) adjacent to the outside. The extruded material having a predetermined cross-sectional shape is formed by pressing the billet metal from the rear side and passing it through the forming hole of the extrusion tool (50).

In order to prevent the billet metal from leaking from between the extrusion tool (50) and the container (51) during extrusion, as a means thereof, conventionally, as shown in FIG. 3, there is a billet hole of the container (51). A sealing surface (55) is formed on the peripheral edge of the front end opening of (52), and a sealing surface (56) is formed on the rear end surface of the extrusion tool (50) corresponding to the sealing surface (55). (55)
(56) A configuration in which the two are closely contacted with each other during extrusion has been adopted.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional seal configuration as described above, the seal surfaces (55) and (56) are deformed mainly due to wear or scratches caused by friction generated during extrusion. It is liable to occur, so the sealing surface (55)
There is a problem that a gap is generated between the (56) and the sealing performance is deteriorated with time.

In particular, in an extrusion processing apparatus for forming an extruded material having a large extrusion ratio such as a flat tube for heat exchangers or a small diameter tube, such a decrease in sealing performance tends to be realized.

In view of the above-mentioned conventional problems, an object of the present invention is to provide an extrusion processing device capable of substantially permanently maintaining the sealing performance between an extrusion tool and a container.

Means for Solving the Problems In the above object, the first invention is an extrusion process for direct extrusion in which an extrusion tool having a diameter larger than that of a container billet hole is arranged at the front end of a container, adjacent to the outside thereof. In the apparatus, a circular protrusion having a diameter difference from the billet hole of the container of 2.0 mm or less and a flat rear end face is provided on the rear end face of the extrusion tool, and the protrusion is inserted at the front end of the billet hole. The gist of the present invention is an extrusion processing device, which is characterized by being fitted in a length of 10 mm or more.

A second aspect of the present invention is an extrusion processing device for direct extrusion, in which an extrusion tool having a diameter larger than a container billet hole is arranged at the front end of the container, adjacent to the outside thereof, and the rear end surface of the extrusion tool. Is provided with a circular protrusion having a diameter difference from the billet hole of the container of 0.5 to 2.0 mm and a flat rear end surface, and the protrusion has a length of 10 to 10 at the front end of the billet hole. The gist is an extrusion processing device characterized by being fitted with 40 mm.

Furthermore, a third invention is based on the extrusion processing apparatus according to claim (1) or (2), characterized in that the protrusion is provided on a rear end surface of a die of an extrusion tool.

Here, terms such as “front end” and “rear end” are defined such that the billet extruding direction is the front and the anti-extruding direction is the rear.

In the above first to third inventions, the diameter difference between the billet hole and the protruding portion is set to 2.0 mm or less because the gap between the peripheral surface of the protruding portion and the peripheral wall surface of the billet hole is set during extrusion. This is to permanently reduce the intruding billet metal. Also, the fitting length is set to 10 mm or more because the billet metal that has entered the gap between the peripheral surface of the projecting portion and the peripheral wall surface of the billet hole is prevented from advancing by friction or the like and does not leak outside. To do so. If the diameter difference between the billet hole and the protruding portion exceeds 2.0 mm and the fitting length is less than 10 mm, a sufficient sealed state cannot be secured.

In the second and third inventions, the diameter difference between the billet hole and the protrusion is set to 0.5 mm or more in order to facilitate the fitting work between the protrusion and the billet hole. . If it becomes smaller than 0.5 mm, the fitting work becomes difficult. The reason why the fitting length is set to 40 mm or less is to avoid the difficulty of the detachment work of the extrusion tool. Even if the length is longer than 40 mm, the sealing effect in the extrusion is useless and the extrusion is not effective. This may cause disadvantages such as increased difficulty in tool attachment / detachment work.

Effect In each of the above inventions, during extrusion, the billet metal that enters the gap between the peripheral surface of the protrusion of the extrusion tool and the peripheral wall surface of the billet hole has a circular protrusion of 2.0 mm or less with respect to the diameter of the billet hole. The diameter is limited to a certain amount. Moreover, the metal that has entered the gap receives resistance such as friction from the peripheral wall surfaces surrounding the gap and is prevented from progressing because the circular protrusion is fitted into the billet hole by 10 mm or more. This combined action prevents the billet metal from leaking between the extrusion tool and the container.

Embodiment Next, an embodiment of the extrusion processing apparatus of the present invention will be described with reference to the drawings.

1 and 2 respectively show an embodiment of the present invention. In FIG. 1, (1) is a container,
The billet hole (2) is loaded with a billet (3) of aluminum or the like, and the front end of the container (1) is adjacent to the outer side of the billet hole (2) of the container (1). An extrusion tool (4) having a diameter larger than the hole diameter is arranged.

This extrusion tool (4) has a die (5), in order from the rear end side.
A backer (6) is installed in a row and is housed in the die ring (7). In this extrusion tool (4), a circular protrusion (10) corresponding to the billet hole (2) is provided on the rear end surface of the die (5), and this protrusion (10)
Are nested in the front end of the billet hole (2).

As shown in FIG. 2, the protrusion (10) has a fitting length 1 with respect to the billet hole (2) in the range of 10 to 40 mm and a diameter difference a-b in the range of 0.5 to 2.0 mm. Is set to.
That is, as for the fitting length l, the longer the fitting length is, the better the sealing performance is, but if it is too long, the sealing effect is useless, and the difficulty of the detaching work of the extrusion tool (4) is rather increased. There is concern about disadvantages. Also, the diameter difference ab
The smaller the value, the better the sealing performance, but if it is too small, the fitting work becomes difficult. The above dimensions are set in consideration of these things.

The container (1) and the extruding tool (4) have abutting portions (8) (9) for restricting the fitting length of the projecting portion (10), etc., at mutually opposing portions as shown in the figure. Is provided.

In the extrusion processing apparatus, the metal of the billet (3), which is under pressure during extrusion, slightly invades into the gap between the peripheral surface of the protrusion (10) and the peripheral wall surface of the billet hole (2). However, the invading billet metal receives resistance such as friction from the peripheral wall surfaces surrounding the gap and is prevented from traveling to the outside. As a result, during extrusion, billet metal leakage from between the container (1) and the extrusion tool (4) is prevented.

As described above, in the above embodiment, the protrusion (10) provided on the rear end face of the die (5) has the billet hole (2).
Since a seal structure is adopted in which the front end of the is fitted in a nested shape, there is no deterioration in the sealing performance over time as in the case of the conventional seal structure in which the sealing surfaces (55) and (56) are in close contact with each other. Therefore, the sealing performance between the extrusion tool (4) and the container (1) can be maintained substantially permanently good without being caused.

In the above embodiment, the protrusion (10) is provided on the rear end surface of the die (5).
The extrusion tool (4) is not limited to the one provided on the rear end surface of the die (5) as long as it is the rear end surface. For example, the protrusion (10) may be provided on a buffer plate which may be provided adjacent to the rear end side of the die (5).

EFFECTS OF THE INVENTION As described above, in the extrusion processing apparatus according to each invention, a circular protrusion having a diameter difference of 2.0 mm or less from the billet hole of the container is formed on the rear end surface of the extrusion tool having a diameter larger than that of the container billet hole. The protruding portion is fitted into the front end portion of the billet hole in a telescopic manner with a length of 10 mm or more. During extrusion, a gap between the peripheral surface of the protruding portion and the peripheral wall surface of the billet hole is formed. A certain amount of billet metal is allowed to enter, and the invasion of the billet metal to the outside is prevented by resistance such as friction from the peripheral wall surfaces surrounding the gap to ensure an appropriate sealed state. Therefore, it is possible to prevent the deterioration of the sealing performance over time due to deformation such as wear of the seal portion as in the case of the conventional seal structure in which the sealing surfaces are brought into close contact with each other, and the seal between the extrusion tool and the container is prevented. Performance is almost permanent It is possible to maintain the good.

Moreover, since the container does not need to be provided with any special means only by providing the protrusion with a predetermined size on the extrusion tool side, the intended purpose can be achieved with a simple device configuration.

Moreover, 2nd and 3rd invention is the said 1st invention,
The diameter difference between the billet hole and the protrusion is not less than 0.5 mm, and the fitting length is not more than 40 mm, so that the protrusion and the billet hole can be fitted smoothly. In addition, it is possible to facilitate the attachment / detachment work of the extrusion tool.

Further, according to the third aspect of the invention, since the protruding portion is provided on the rear end surface of the die of the extrusion tool, it is possible to simplify the device configuration and the like.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential portion showing an embodiment of an extrusion processing apparatus of the present invention, FIG. 2 is an enlarged sectional view of a fitting portion between a projecting portion and a billet hole in the above embodiment, and FIG. FIG. 3 is a schematic partial vertical cross-sectional view of the extrusion processing apparatus of FIG. (1) …… Container, (2) …… Billet hole, (4)…
… Extrusion tool, (10) …… projection.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masami Sudo, 6-224, Kaiyamacho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd. (72) Nobuo Inaba, 6-224, Kaiyamacho, Sakai City, Osaka Showa Aluminum Within the corporation (56) Reference JP-A-57-31408 (JP, A) JP-B 39-9484 (JP, B1) JP-B 52-1387 (JP, B2) JP-B 55-9244 (JP, B2) Actual public Sho 33-6036 (JP, Y1)

Claims (3)

[Claims] 1. An extrusion processing apparatus for direct extrusion, wherein an extrusion tool having a diameter larger than a container billet hole is arranged at the front end of the container, adjacent to the outside thereof, and the container is provided at the rear end surface of the extrusion tool. A circular protrusion having a diameter difference from the billet hole of 2.0 mm or less and a flat rear end face is provided, and the protrusion is telescopically fitted to the front end of the billet hole for a length of 10 mm or more. Extrusion processing device characterized by. 2. An extrusion processing apparatus for direct extrusion, wherein an extrusion tool having a diameter larger than a container billet hole is arranged at the front end portion of the container, adjacent to the outside thereof, and the container has a rear end surface on which the container is attached. Is provided with a circular projecting portion having a diameter difference from the billet hole of 0.5 to 2.0 mm and a flat rear end surface, and the projecting portion is telescopically fitted to the front end portion of the billet hole with a length of 10 to 40 mm. An extrusion processing device characterized by being formed. 3. The projecting portion is provided on a rear end surface of a die of an extrusion tool (1).
Alternatively, the extrusion processing apparatus according to (2).