JPH05337539A - Extruding die - Google Patents

Abstract

PURPOSE:To effectively cool a bearing hole and a material to be extruded by providing a bearing tip having a thickness corresponding to the length of the bearing hole and a flow path for a cooling medium between a tip supporting metallic die opposing adjacently to the front end face of the bearing tip and the bearing tip. CONSTITUTION:An extruding die 3 consists of the bearing tip 5 having a hole which consists the bearing part of the die and a metallic die 6 which supports the tip. The supporting metallic die 6 is provided with a tip arranging recess part 8 having a relief hole 9 in its center and a groove 10 for a cooling medium flow path is formed on the face of the die 6 contacting to the tip 5. The groove 10 consists of a circular groove 10a which is concentric with the relief hole 9 and plural straight grooves 10b which extend from the groove 10a inside in the direction of diameter and open in the relief hole 9. On the face of the die 6 in the opposite side to the tip 5, a circular groove which is concentric with the relief hole 9 is formed and a straight groove 16 is formed from the circular groove to the outside circumference. The groove 16 and the groove 10a are connected with plural longitudinal grooves 13. The cooling medium is charged from an end part 17 and discharged into the relief hole 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion die used for extruding a metal extruded material such as aluminum.

[0002]

2. Description of the Related Art For example, in the extrusion of a high-strength aluminum alloy of A7000 series, a recrystallized layer is formed on the surface of the obtained extruded material, which causes various adverse effects, so that the growth of the recrystallized layer is suppressed. For the purpose, a cooling medium such as liquid nitrogen is used to cool the die, particularly the die bearing portion or the extruded material immediately after passing through the bearing portion. In addition, in the case of extrusion of A5000 series or A2000 series high-strength aluminum alloys, similarly, extrusion may be performed while cooling a die or an extruded material using a cooling medium. Furthermore, even in the extrusion of aluminum alloy widely, the die bearing part, etc. is prevented for the purpose of preventing the deterioration of the material of the extruded material caused by the temperature rise of the die bearing part due to the repeated extrusion and suppressing the life reduction of the die bearing part. May be cooled.

For cooling the die bearing portion and the extruded material as described above, conventionally, for example, an extrusion processing apparatus having a structure as shown in FIG. 4A has been used. This extrusion processing device comprises an extrusion die (53) and a backer (5) for an extrusion tool (52) arranged adjacent to the front end of a container (51).
It was supposed that a cooling medium flow passage (55) was formed between it and 4). This cooling medium flow passage (56) is formed by closing the groove (56) formed on the rear end face of the backer (54) in the extrusion direction with the front end face of the die (53), as shown in FIG. It is a thing. Then, the extrusion was carried out using this extrusion processing apparatus while sending liquid nitrogen to the flow passage (55).

[0004]

However, in the conventional extrusion processing apparatus as described above, cooling of the die bearing portion (57) is performed from the position of the mating surface between the die (53) and the backer (54). Therefore, there is a drawback in that the distance from the cooling source to the required cooling point is long and the cooling is not always performed efficiently. Also, for example, A7
In extruding a 000 series alloy, it is better to cool the extruded material immediately after passing through the bearing portion (57).
It was desired to supply the liquid nitrogen at the position where it was mated with 4), and at a position further close to the bearing (57).

In view of the above-mentioned conventional problems, the present invention is capable of efficiently cooling the die bearing portion, and / or is effective when the extruded material is very close to the die bearing portion. It is an object to provide an extrusion die that can be cooled efficiently.

[0006]

In the above object, the present invention has a bearing hole having a wall thickness corresponding to the length of the bearing hole, and a bearing chip disposed adjacent to a front end face of the bearing chip. An extrusion die is characterized in that a cooling medium flow passage is provided between opposing surfaces of the bearing chip and the supporting die.

[0007]

In the above structure, the cooling medium flows at the mating surface between the bearing chip and the supporting die, that is, at the adjacent position directly adjacent to the bearing hole. Therefore, the bearing portion is cooled efficiently. Also, when the cooling medium is sprayed on the extruded material, this spraying can be performed at a position very close to the bearing hole.

[0008]

EXAMPLES Next, examples of the die of the present invention will be described.

In the extrusion processing apparatus shown in FIG. 1,
(1) is a container and (2) is an extrusion tool. In the extrusion tool (2), (3) is an extrusion die and (4) is a backer.

The extrusion die (3) is composed of a circular bearing tip (5) and a bearing tip supporting die (6).

As shown in FIG. 1 and FIG. 2 (b), the bearing tip (5) has a circular bare-length hole (7), and has the same wall thickness as the bearing hole (7). It is composed of a thin plate material having.

As shown in FIG. 1, the supporting die (6) has a circular tip placement recess (8) in which a bearing tip (5) is placed in a fitted state at the center of the rear end face in the extrusion direction. And a relief hole (9) for allowing the extruded material to pass therethrough is provided in the shaft core of the recess (8).

Then, as shown in FIG.
A groove (10) for forming a cooling medium flow passage is formed in the bottom surface of the chip placement recess (8) of the supporting die (6). The groove (10) is an annular groove (10a) provided concentrically with the relief hole (9), and the tip end extends radially inward from the annular groove (10a) and has a relief hole (9) And a plurality of linear grooves (10b) provided at predetermined intervals in the circumferential direction. (11) ... is an outlet.

On the other hand, as shown in FIG. 3, a groove (12) for forming a cooling medium flow passage is also formed on the front end surface of the supporting die (6) in the extrusion direction. This groove (12)
Has the same diameter as the annular groove (10a), and the groove (10a)
) And an annular groove (12a) arranged concentrically with each other, and one end extending radially outward from the annular groove (12a) to reach the outer peripheral portion of the supporting die (6). Straight groove (12b
) And.

The supporting mold (6) is provided with a plurality of communicating holes (13) for communicating the annular grooves (10a) (12a) on the front and rear end surfaces thereof. Is provided so as to extend parallel to the axial direction of.

The extrusion die (3) is a supporting die (6).
The bearing tip (5) is placed in the tip placement recess (8) on the rear end face, and both are integrated by shrink fitting and welding. As a result, between the bearing chip (5) and the supporting mold (6), as shown in FIG. 1, an annular groove (10a) and a linear groove (10b) are formed.
The cooling medium flow passage (15) is formed by.

Then, the extrusion tool (2) is adjacent to the front end of the extrusion die (3) in the extrusion direction, and the backer (4).
By this arrangement, the cooling medium flow passage (16) is formed by the annular groove (12a) and the linear groove (12b) between them. (17) is an inlet for the cooling medium.

In the extrusion, while the extrusion tool (2) is arranged at the front end of the container (1), a cooling medium is supplied through an inflow port (17) opening to the outer periphery of the extrusion tool (2). To do. As the billet, for example, A
High-strength aluminum alloys such as 7000 series, A5000 series, or A2000 series, and other aluminum alloys are used. Liquid nitrogen is typically used as the cooling medium, but nitrogen gas, air, or the like may be used. Since the cooling medium is supplied to a region very close to the bearing hole (7), the bearing hole (7) can be effectively cooled even by cooling with nitrogen gas or air.

During the extrusion, the cooling medium introduced from the inflow port (17) receives the flow passage (16) on the backer (4) side and the communication hole (1).
3) ... And through the flow passage (15) between the bearing tip (5) and the supporting die (6), the outlet (11) ...
It will be blown inward from. Therefore, the bearing hole (7) has a flow passage (1) between the bearing chip (5) and the supporting mold (6) which are directly adjacent to the hole (7).
5) is cooled by the cooling medium flowing through it, and therefore
The bearing hole (7) is cooled efficiently. Further, since the cooling medium is blown out at a position very close to the bearing hole (7), it is possible to exert an effective cooling action on the extruded material (E) immediately after passing through the bearing hole (7). In the case of extruding an A7000 series aluminum alloy or the like, the growth of the surface recrystallized layer can be suppressed more effectively.

[0020]

As described above, the extrusion die of the present invention has a bearing hole and a bearing chip having a wall thickness corresponding to the length of the bearing hole, and is adjacent to the front end face of the bearing chip. It is composed of a bearing die supporting die arranged, and a cooling medium flow passage is provided between the facing surfaces of the bearing tip and the supporting die, so that the cooling medium is very close to the bearing hole of the die. Since it passes through a position close to each other, the die bearing hole can be efficiently cooled, and / or the extruded material can be effectively and efficiently cooled at a position very close to the die bearing portion.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an extrusion processing apparatus using a die of the present invention.

2 is a II-II diagram of FIG. 1, in which FIG. 2A is a rear end view of a supporting mold, and FIG. 2B is a rear end view of a bearing tip.

FIG. 3 is a III-III diagram of FIG. 1 and is a front end view of a supporting mold.

4A and 4B show a conventional extrusion processing apparatus, in which FIG. 4A is a vertical cross-sectional view of the extrusion processing apparatus, and FIG. 4B is IV- in FIG. 4A.
It is an IV diagram and is a rear end view of a backer.

[Explanation of symbols]

 3 ... Die 4 ... Backer 5 ... Bearing chip 6 ... Supporting mold 7 ... Bearing hole 15 ... Cooling medium flow passage

Claims (1)

[Claims] 1. A bearing chip having a bearing hole and having a wall thickness corresponding to the length of the bearing hole, and a bearing chip supporting die arranged adjacent to a front end face of the bearing chip, An extrusion die comprising a cooling medium flow passage provided between surfaces of a bearing chip and a supporting die opposed to each other.