JPH0215820A - Extrusion apparatus - Google Patents

Abstract

PURPOSE:To improve sealing property between an extrusion tool and container by forming a circular projecting part corresponding to a billet hole on the rear end surface of the extrusion tool and providing an inserting part shaped a nest on the front end part of the billet hole. CONSTITUTION:The circular projecting part 10 corresponding to the billet hole 2 on the rear end surface of the die 5 consisting of the extrusion tool 4, the die 5 is inserted into the billet hole 2 through the projecting part 10. At this time, abutting parts 8, 9 to control an inserting length of the projecting part 10 are disposed on the container 1 and extrusion tool 4. During extrusion of the billet 3, the billet 3 being pressurized state, penetrates into the clearance between the peripheral surface of the projecting part 10 and the peripheral wall surface of the billet hole 2, because the projecting part 10 is inserted into the billet hole 2 in the state of the nest, the penetrating of the billet 8 is prevented. By this method, the sealing property between the container 1 and extrusion tool 4 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an extrusion processing apparatus, and particularly to an extrusion processing apparatus for metal materials such as aluminum materials.

2. Description of the Related Art Generally, in this type of extrusion processing apparatus, as shown in FIG. 3, an extrusion tool (50) including a die, etc.
) is arranged in a sealed state on the front end side (right side in the figure) of the billet hole (52), and the billet (53) placed in the billet hole (52) is inserted into the stem (54) through the dummy block (57). By applying pressure from behind and passing through an extrusion tool (50), an extruded material having a predetermined cross-sectional shape is obtained. Extrusion tool (50) and container (51)
The seal with the container (5
A sealing surface (55) formed on the front end opening periphery of the billet hole (52) of 1) and a sealing surface (55) formed on the rear end surface of the extrusion tool (50) corresponding to this sealing surface (55).
B) is carried out by bringing them into close contact with each other.

Problems to be Solved by the Invention However, when employing the seal structure as described above, the following problems may occur. It is the sealing surface (55
) (58) In the case of a configuration in which the sealing surfaces (55) (5B) are brought into close contact with each other, the sealing surfaces (55) (5B) may be worn or scratched due to friction mainly generated during extrusion.
) (5B) is deformed, creating a gap between the sealing surfaces (55) and (5B), which causes the billet (53) to deform during the extrusion process.
leaks to the outside through the gap, and sealing performance may deteriorate over time. Particularly when processing products with a large extrusion ratio, such as flat tubes for heat exchangers and small-diameter tubes, such a reduction in sealing performance is a major problem.

This invention has been made in view of the above problems, and an object thereof is to provide an extrusion processing apparatus that can permanently maintain sealing performance between an extrusion tool and a container.

Means for Solving the Problems Therefore, in the extrusion processing apparatus of the present invention, a circular protrusion corresponding to the billet hole of the container is provided on the rear end surface of the extrusion tool, and the protrusion is provided at the front end of the billet hole. The gist is that they are fitted in a nested manner.

Here, terms such as "front end" and "rear end" are defined as the extrusion direction of the billet as the front and the opposite extrusion direction as the rear.

Further, in the extrusion processing apparatus described above, when the rear end side of the extrusion tool is a die, it is preferable that a protrusion is provided on the rear end surface of the die.

Further, in the extrusion processing apparatus, it is preferable that the fitting length of the protrusion into the billet hole is 10+ nm or more, and the diameter difference between the billet hole and the protrusion is set to 2.0 cm or less.

As a result of the above, the billet under pressure during extrusion
The billet will invade the gap between the circumferential surface of the protrusion and the circumferential wall of the billet hole, but the progress of the billet after intrusion is suppressed for the following reasons, and the gap between the container and the extrusion tool is The seal will be achieved. In other words, since the protruding part is nested inside the billet hole, the cross-sectional area of the gap between the circumferential surface of the protruding part and the circumferential wall of the billet hole is small, and the billet cannot penetrate into the gap. This is because the billet that has entered the gap is subjected to resistance such as friction from the surrounding wall surfaces surrounding the gap, and its progress is hindered.

At this time, a reliable seal can be obtained by setting the fitting length of the protrusion to 101111 or more and the difference in diameter between the billet hole and the protrusion to 2.0IIIll or less. The fitted length is less than 10ffili and the diameter difference is 2. If it exceeds 0 mm, the sealing performance may deteriorate slightly.

EXAMPLE Next, an example of the extrusion processing apparatus of the present invention will be described based on the drawings.

FIGS. 1 and 2 each show an embodiment of the present invention. In Figure 1, (1) is a container;
A billet (3) of aluminum or the like is placed in the internal billet hole (2), and an extrusion tool (4) is placed on the front end side of the container (1). This extrusion tool (4) includes a die (5), a backer (6) in order from the rear end side.
) are arranged in series and housed in a die ring (7). In this extrusion tool (4), a circular protrusion (lO) corresponding to the billet hole (2) is provided on the rear end surface of the die (5), and this protrusion (10)
is fitted into the front end of the billet hole (2). Note that the container (1) and the extrusion tool (4) each have abutting parts (8) and (9) on opposing parts as shown in the figure, for regulating the fitting length of the protruding part (lO), etc. is provided.

As shown in FIG. 2, the protrusion (lO) has a billet hole (
The fitting length Ω for 2) should be 10 mm or more, and the diameter difference a-b with the billet hole (2) should be 0.8) or less. Particularly preferably, the fitting length ρ is 10
~40a+m, the diameter difference a-b is 0. 5-2. On
It is set in the range of +a+.

In other words, the longer the fitting length ρ is, the better the sealing performance will be, but if it is too long, it will be useless in terms of sealing effect, and will instead have disadvantages such as increasing the difficulty of removing the extrusion tool (4). There are concerns.

Further, the smaller the diameter difference a-b, the better the sealing performance, but if it is too small, it becomes difficult to perform the fitting operation.

Although the above dimensions are set in consideration of these matters, the present invention is not limited to this dimension range.

Next, the operating state of the extrusion processing apparatus having the above configuration will be explained. During the extrusion process, the billet (3) under pressure has a protrusion (
It will invade the gap between the peripheral surface of the billet hole (2) and the peripheral surface of the billet hole (2).

However, in this billet (3), since the protruding part (lO) is nested inside the billet hole (2), there is a gap between the circumferential surface of the protruding part (10) and the circumferential wall surface of the billet hole (2). The cross-sectional area of the gap is small, making it difficult for the object to penetrate into the gap.Moreover, once it has penetrated, it receives resistance such as friction from the surrounding walls surrounding the gap, and its progress is hindered. Leaking outside through the gap is suppressed and a seal is achieved between the container (1) and the extrusion tool (4).

As described above, in the above embodiment, the protrusion (10) provided on the rear end surface of the die (5) is connected to the billet hole (2).
Since the seal structure is fitted in a nested manner to the front end of the seal surface (55) (5B
) does not cause the problem of deterioration of sealing performance over time unlike the seal configuration in which the extrusion tool (4) and the container (1) are in close contact with each other, and as a result, the sealing performance between the extrusion tool (4) and the container (1) can be maintained almost permanently. It becomes possible to maintain it well.

In the above embodiment, the protrusion (10) is provided on the rear end surface of the die (5), but
It is not particularly limited to what is provided on the rear end surface of the die (5) as long as it is provided on the rear end surface of the extrusion tool (4). For example, the protrusion (1o) may be provided on a buffer plate that is sometimes provided adjacent to the rear end side of the die (5).

Effects of the Invention As explained above, the extrusion processing apparatus of the present invention employs a sealing structure in which the protrusion provided on the rear end surface of the extrusion tool is nestedly fitted into the front end of the billet hole. As a result, the sealing performance between the extrusion tool and the container can be maintained almost permanently, unlike conventional seal configurations in which the sealing surfaces are brought into close contact with each other. This makes it possible to maintain it in good condition.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical cross-sectional view of a main part showing an embodiment of an extrusion processing apparatus of the present invention, and Fig. 2 is an enlarged cross-sectional view of a fitting part between a protrusion and a billet hole in the above embodiment. 3 are schematic partial vertical sectional views of a conventional extrusion processing apparatus. (1) Container, (2) Billet hole, (4
)...Extrusion tool, (lO)...Protrusion part. Above d part Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) An extrusion tool characterized in that a circular protrusion corresponding to the billet hole of the container is provided on the rear end surface of the extrusion tool, and the protrusion is fitted into the front end of the billet hole in a nested manner. Processing equipment. (2) The extrusion processing apparatus according to claim (1), wherein the protrusion is provided on a rear end surface of a die in the extrusion tool. (3) The fitting length of the protrusion into the billet hole is 10
mm or more, and the diameter difference between the billet hole and the protrusion is
Claim (1) or (2) in which the diameter is set to 2.0 mm or less
) Extrusion processing equipment described.