JPH06226332A - Method for extruding semi-hollow material - Google Patents

Abstract

PURPOSE:To comparatively easily extrude a semihollow material of high strength series aluminum alloy such as A2000 series, A5000 series and A7000 series, etc. CONSTITUTION:A mandrel 2 and a forming hole 7 into which a tongue forming part 8 is projects inward are provided and a solid die 1 provided with a mandrel passing hole 9 to pass the mandrel 2 is used in the tongue forming part 8. Under a state that the mandrel 2 is inserted into a billet B and the mandrel passing hole 9 of the solid die 1, the mandrel 2 and a stem 5 are driven forward to perform extrusion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-hollow material made of aluminum, especially A2000 series, A5000 series, A700 series.
The present invention relates to an extrusion processing method suitable for extruding a so-called high strength aluminum alloy semi-hollow material such as 0 series.

[0002]

2. Description of the Related Art The molding of an aluminum semi-hollow material having a tongue that is a bay-shaped space inside has a molding hole that projects the tongue molding part inward when the tong ratio is low. In some cases, extrusion molding is possible even using a solid die.

However, as the tongue ratio becomes higher, the cantilever supporting force of the tongue-molded portion of the solid die becomes weaker, and the tongue-molded portion receives the pressure of the extruded material during extrusion, and the tongue-molded portion has a proximal constriction. The risk of breakage increases and extrusion becomes difficult.

Therefore, conventionally, an extrusion method using a combination mold (51) as shown in FIG. 3 has been proposed.
That is, the mold (51) is supported by a bridge (57) and a molding mold (52) having a molding hole (53) formed by projecting the tongue molding portion (54) inward. And a reinforcing mold (55) having a tongue molding part holding core (56), and the reinforcing mold (55) is arranged at the rear part of the molding mold (52). ) Are fastened to the holding core (56) with bolts (58) to be combined (see JP-A-3-230812).

With such a die structure, the tongue molding portion (54) is firmly held by the reinforcing die (55), and during extrusion,
The occurrence of a situation in which the tongue-molded portion (54) is damaged at the base end constricted portion (54a) is suppressed, and its practicality is significantly improved compared to the case of the solid die alone as described above. It will be

[0006]

However, in the conventional extrusion method as described above, the effect can be effectively exhibited in the extrusion of the soft aluminum semi-hollow material,
On the other hand, especially A2000 series, A5000 series, A7000
Extrusion of a so-called high-strength aluminum alloy semi-hollow material such as a system, especially in the extrusion of a thin large-sized semi-hollow material of such a material, the pressing ratio becomes too high for the high-strength alloy, and Due to the fact that the presence of the bridge (57) causes the extruded material to undergo a process of cutting and welding, there is a problem that a very large pushing force is required and the extrusion becomes very difficult.

The present invention solves the above-mentioned conventional drawbacks and allows relatively easily extruding so-called high strength aluminum alloy semi-hollow materials such as A2000 series, A5000 series and A7000 series. It is an object of the present invention to provide an extrusion processing method capable of processing.

[0008]

To achieve the above object, according to the present invention, a mandrel and a tongue molding portion have a molding hole projecting inward, and the tongue molding portion is provided with a mandrel through hole through which the mandrel is passed. Using a solid die and a solid die, a method for extruding a semi-hollow material, characterized in that the mandrel and the stem are driven forward to perform extrusion in a state where the mandrel is passed through the billet and the mandrel through hole of the solid die. Use as a summary.

As the billet, it is preferable to use a hollow billet in which a mandrel through hole is pre-drilled.

[0010]

In the above method, the use of the mandrel reduces the pressing ratio, which is the ratio of the cross-sectional area of the billet to the cross-sectional area of the forming hole, and also lowers the pressure on the tong forming portion. Further, since the solid die is used, the extruded material passes through the die without undergoing the process of cutting and pressure bonding in the die. Further, during extrusion, the mandrel is also driven forward, so that the movement of the mandrel urges the extruded material forward in the extrusion direction. As a result, the pushing force is reduced and the A2000
A semi-hollow material made of a high-strength aluminum alloy such as A series, A5000 series, and A7000 series can be extruded relatively easily.

[0011]

EXAMPLE Next, an example in which the method of the present invention is applied to the extrusion of a thin semi-hollow material (E) made of a high-strength aluminum alloy having a shape as shown in FIG. 2 will be described.

Needless to say, the method of the present invention can be suitably applied to extrusion of semi-hollow materials made of aluminum alloys other than high-strength aluminum alloys and extrusion of semi-hollow materials of various shapes. .

In the extrusion processing apparatus of FIG. 1 used for carrying out the method of the present invention, (1) is a solid die and (2) is a mandrel. Further, (3) is a container, (4) is a dummy, and (5) is a stem.

The forming hole (7) provided in the solid die (1) has a tongue forming portion (8) projecting inward so as to correspond to the cross-sectional shape of the semi-hollow die member (E) of FIG. It is supposed to have a shape.

A lead-in is arranged at the rear of the forming hole (7) so that the billet metal (B) in the container (3) can be smoothly introduced into the forming hole (7) during extrusion. May be.

The tongue molding portion (8) is provided with a mandrel through hole (9) through which the mandrel (2) is passed. The mandrel through hole (9) is formed as large as possible in the tongue molding part (8) because the mandrel (2) is adopted for the purpose of reducing the pressing ratio. Is preferred.

The shape of the mandrel through hole (9) of the die (1) is circular in the case of the illustrated die (1) in consideration of the shape of the tongue forming portion (8), but various other shapes are also available. It may be formed in a shape.

The mandrel (2) is a so-called floating mandrel, and is held together with the stem (5) during the extrusion so as to move forward in the extrusion direction.

The mandrel (2) contributes to the reduction of the pushing ratio, and has a shape corresponding to the shape of the mandrel through hole (9) of the die (1) and conforms to the mandrel through hole (9). It is formed to be inserted in a sliding state.

The mandrel (2) and the die (1)
A gap through which the billet metal passes may be formed between the mandrel through hole (9).

The billet (B) used is a hollow billet in which a mandrel hole (10) for inserting the mandrel (2) is preliminarily drilled in the shaft center portion thereof. In addition, when perforating inside the container (3), a solid billet without perforation may be used.

The material of the billet (B) is A2000 series,
It is a so-called high strength aluminum alloy such as A5000 series and A7000 series. As the A5000 series alloy, for example, A5083, A5052 or higher, and as the A7000 series alloy, for example, A7075 may be adopted.

For the extrusion, the mandrel through hole (10) of the billet (B) loaded in the container (3) and the mandrel through of the solid die (1) are used by using the above-mentioned extrusion processing device and the billet (B). The mandrel (2) is inserted into the hole (9) from the rear side, and in this state, the stem (5) is driven forward together with the mandrel (2).

In this extrusion method, since the mandrel (2) is used, the cross-sectional area of the billet (B) is reduced to reduce the pressing ratio, and the solid die (1) is used. The extruded material does not go through the process of cutting and welding in the die, and the mandrel (2) adopts the floating mandrel system that is driven forward together with the stem (5), so the billet metal inside the container (3) (B) will be urged forward in the extrusion direction. Therefore, the amount of pushing force can be reduced, and the thin semi-hollow material (E) made of the high-strength aluminum alloy as described above can be extruded relatively easily.

[0025]

As described above, according to the method for extruding a semi-hollow material of the present invention, the mandrel and the tongue molding portion have the molding holes protruding inward, and the mandrel is passed through the tongue molding portion. Using a solid die provided with a through hole, in a state where the mandrel is passed through the billet and the mandrel through hole of the solid die, since the mandrel and the stem are driven forward to perform extrusion,
Pushing force is reduced, especially A2000 series, A5000
It is possible to extrude a semi-hollow material made of a high-strength type aluminum alloy such as the A series and A7000 series relatively easily and without any trouble.

Of course, also in the extrusion of other semi-hollow materials made of aluminum, it is possible to extrude with a low pushing force, and the semi-hollow materials can be extruded efficiently.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of an extrusion processing apparatus used for carrying out a method of the present invention, and FIG. 1B is a cross-sectional view taken along the line I-I of FIG.

FIG. 2 is a perspective view of a semi-hollow material to be manufactured.

3A and 3B show a conventional die, wherein FIG. 3A is a sectional view, and FIG. 3B is a sectional view taken along the line III-III of FIG.

[Explanation of symbols]

 1 ... Solid die 2 ... Mandrel 5 ... Stem 7 ... Forming hole 8 ... Tong forming part 9 ... Mandrel through hole B ... Billet E ... Semi-hollow material

Claims (1)

[Claims] 1. A mandrel and a solid die having a tongue molding portion having a molding hole protruding inward, and a tongue molding portion having a mandrel through hole through which the mandrel is passed. A method for extruding a semi-hollow material, which comprises extruding by driving a mandrel and a stem forward while being passed through a mandrel through hole of a solid die.