JPH0569034A - Method for mandrel extruding for metallic hollow billet - Google Patents

Abstract

PURPOSE:To execute mandrel extruding with use of an ordinary extruder by a single acting press. CONSTITUTION:A special dummy 1 having a T-shaped side view wherein a mandrel bar 5 is provided to a dummy block 4 in a cantilever state is used and the special dummy 1 and a billet 2 are arranged in a container 8 in a state that the mandrel bar 5 is penetrated through the billet 2 and a stem 10 is driven forward to extrude the billet 2 under the state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extruding a metal hollow mold material by a mandrel, for example, a hollow mold material made of 6000 series aluminum alloy, a hollow mold material made of so-called high strength aluminum alloy of 2000 series, 5000 series, etc. The present invention relates to a method for extruding a mandrel such as a hollow composite material made of a base composite material.

[0002]

2. Description of the Related Art There are a combination die method and a mandrel method for extruding a hollow metal material, and a mandrel method is used for extruding a hollow material having no welding line. Generally, this mandrel type extrusion processing device is
A double-acting press with two rams, a main ram and a pier salam, was used to pierce the billet loaded in the container by driving the pier saram, place the mandrel in the die hole, and drive the main ram. It is supposed to perform extrusion.

[0003]

However, the extrusion device using the double-acting press as described above is expensive,
In addition, it is necessary to prepare an apparatus having a structure different from that of a normal extrusion apparatus used for extrusion of a combination die method, etc., and therefore, an ordinary single-action press having only a main ram is used. There has been a demand for a new mandrel extrusion method capable of extruding a hollow mold material having no welding line using an extrusion processing apparatus.

In view of the above technical background, an object of the present invention is to provide a mandrel extrusion capable of producing a hollow mold material having no welding line by using a normal extrusion processing apparatus by a single-acting press.

[0005]

To achieve the above object, the present invention uses a special dummy having a T-shaped side view in which a mandrel bar is cantilevered on a dummy block, and the special dummy and billet are A gist of a mandrel extruding method of a metal hollow mold material is characterized in that a dummy mandrel bar is arranged in a container in a state of penetrating a billet, and in that state, a stem is driven forward to perform extruding.

[0006]

In the above method, a special dummy is used, and the mandrel bar of the special dummy is placed in the container with the special dummy mandrel bar penetrating the billet and extruded. A hollow mold material having no welding line, the peripheral shape of which is defined by die holes, is extruded by a normal extrusion device using a single-acting press.

[0007]

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

In FIG. 1 (a), (b) and (c),
(1) is a special dummy, (2) is a billet, and (3) is an extrusion device.

As shown in FIG. 1 (a), the special dummy (1) is a disk-shaped or column-shaped dummy block (4) and a mandrel whose one end is cantilevered in the center thereof. Consists of a bar (5) and side view T
It is formed in a letter shape.

The billet (2) is made of 6000 series aluminum alloy, 5000 series aluminum alloy such as A5083, 2000 series aluminum alloy such as A2014, or so-called high strength aluminum alloy, or S.
The mandrel of the special dummy (1) is formed on the shaft core of the mandrel as shown in FIG. 1 (b), which is manufactured by using a metal matrix composite material (MMC, FRM) such as iC / Al. The hollow billet has a through shaft hole (2a) through which the bar (5) is inserted. The axial hole (2a) may be formed by forming a columnar billet and then performing a piercing process, or in the case of an aluminum alloy during casting, or in the case of a metal matrix composite material, The hot isostatic pressing (HIP) or CIP may be performed together.

The extruder (3) is a normal extruder using a single-acting press, (8) is a container, and (9) is a container.
Is a die and (10) is a stem.

Extrusion is carried out as follows. That is, as shown in Fig. 1 (b), the shaft hole (2a) of the billet (2)
As shown in FIG. 1 (c), the combination product in which the mandrel bar (5) of the special dummy (1) is arranged in the penetrating state is
Charge into the container (8) of the extruder (3). The mandrel bar (5) of the special dummy (1) may be inserted into the shaft hole (2a) of the billet (2) after the billet (2) is loaded into the container (8). . Then, as shown in FIG. 2, the stem (10) is driven forward. As a result, the billet metal passes through the forming gap between the advancing mandrel bar (5) and the hole (9a) of the die (9) and is extruded into a hollow mold member (E) having no welding line.

In the method of the present invention, the billet (2) may be manufactured integrally with the special dummy (1), and the billet (2) may be inserted into the container (8) for extrusion. In that case, if the special dummy (1) and the billet (2) are integrated, when the billet is manufactured by casting like an ordinary aluminum alloy, the special dummy (1) is integrated during the casting. When the billet is manufactured by the HIP method or the CIP method like the metal matrix composite material, the special dummy (1) may be integrated during the pressing.

[0014]

As described above, the mandrel extrusion method of the present invention uses a special dummy having a T-shaped side view in which the mandrel bar is provided in a cantilever state on the dummy block, and the special dummy and the billet are A special dummy mandrel bar is placed in the container with the billet passing through it, and in this state, the stem is driven forward to carry out extrusion, so a hollow die material without welding line is pressed by a single-action press. It can be manufactured using a usual extrusion processing apparatus according to

[Brief description of drawings]

1A and 1B show a method of an embodiment of the present invention, FIG. 1A is a perspective view of a special dummy, FIG. 2B is a perspective view showing a state in which a billet is combined with a special dummy, and FIG. It is an extruder longitudinal sectional view showing the state where the combination was loaded in the container of the extruder.

FIG. 2 is a vertical sectional view showing the extruder during extrusion.

[Explanation of symbols]

 1 ... Special dummy 2 ... Billet 3 ... Extruder 4 ... Dummy block 5 ... Mandrel bar 10 ... Stem

Claims (1)

[Claims] 1. A special dummy having a T-shaped side view in which a mandrel bar is provided in a cantilever state on a dummy block,
The special dummy and the billet are arranged in a container with a mandrel bar of the special dummy penetrating the billet, and in this state, a stem is driven forward to perform extrusion, and a hollow metal material Mandrel extrusion method.