JPH02127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for extruding a rod-shaped body made of aluminum or its alloy material. This invention relates to a method for extruding rod-shaped bodies.

Prior Art After a billet of aluminum or its alloy is charged into an opening in a container, a die is placed at one end of the opening, and a pressurizing stem is applied to the billet at the other end via a dummy block. An indirect extrusion method is used in which a pressurizing stem and a container are integrally moved toward the die to extrude the billet through the die opening to obtain a rod-shaped body. Separately, the container is placed in place, and the billet inside the container opening is directly inserted into the container.
A direct extrusion method is used in which a pressurizing stem applies pressure through a dummy block and extrudes the rod through a die opening.

In any of these extrusion methods, it is necessary to separate the unextruded material from the extruded material. Figure 4 shows a commonly used method for separating unextruded material from unextruded material, in which a shows the state inside the extrusion device at the end of extrusion, and b shows how unextruded material and unextruded material are separated. The state when separated by shearing is shown, and c also shows the state when separated by hot saw cutting. In the figure 1
is a container, 2 is a die, 3 is a pressure stem, and 4 is a die stem.

In an extrusion device in which the die 2 is not fixed to the die stem 4, after extrusion is completed, the container 1 and the pressure stem are moved in opposite directions to expose the die 2, the unpressed portion 5, and the dummy block 6,
Next, the shear 7 mounted above is lowered to shear and separate the remaining extrusion 5 to which the dummy block 6 is adhered, together with the die 2, between the die 2 and the end of the extruded material 8. In a device in which the die 2 is fixed to the die stem 4, the remaining press 5 and the dummy block 6 are exposed outside the container 1, and the die 2 and the remaining press 5 are exposed to the outside of the container 1.
It is sheared between the unpressed block 5 and the dummy block 6.
Separate. In the case of hot saw cutting, the container 1 is moved in the direction of the arrow, the die stem 4 is also moved in the same direction, and the pressure stem 3 is moved in the opposite direction to expose the die 2, the remaining press 5, and the dummy block 6. A tail portion of the extruded material 8 is exposed between the die 2 and the die stem 4, and a hot saw 9 is lowered to cut the extruded material 8 at the tail portion, thereby separating the unextruded material 5 together with the die 2 and the dummy block 6.

Problems to be Solved by the Invention Conventionally, to separate the unextruded material after extrusion using an extrusion device, methods using shear shearing as described above and methods using a hot saw have been used. There were problems with the following points.

That is, the size of the outer diameter of the extruded material is limited by the capacity of the shearing device or clogging of the saw. Therefore, in order to increase the diameter of the extruded material, large-scale equipment or large-scale modification is required in order to expand the capacity of the shearing or cutting equipment. In addition,
In shearing or cutting for separation, the cut surface,
Sagging occurs on the sheared surface. This sag poses a problem in the automation of extrusion equipment.

An object of the present invention is to provide an extrusion method for extruding a rod-shaped body made of aluminum or an alloy thereof, in which the extruded material and the unextruded material can be easily separated after the end of extrusion, and thereby The object of the present invention is to solve problems such as limitations on the outer diameter of extruded materials in conventional extrusion methods.

Means for Solving the Problems The method of extruding an aluminum or aluminum alloy rod according to the present invention is configured as follows in order to achieve the above object.

That is, a die is placed at one end of the opening in the container, and the billet charged into the opening is pressurized directly against the die by a pressurizing stem, or via the container and the pressurizing stem. In the method of extruding the billet into a rod-shaped body through the opening of the die by applying pressure, a mandrel that can move forward and backward is attached to the pressurizing stem, and the tip of the mandrel penetrates the unpressed part at the end of extrusion. Extrusion is performed with the mandrel advanced in advance from the front of the pressure stem so that it can enter the forming hole of the die, and at the end of extrusion, the mandrel is advanced into the forming hole of the die to create a space between the unextruded body and the rod-shaped body. The remaining part and the rod-shaped body are separated while forming a hollow tubular part.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

1 to 3 show embodiments of the present invention, in which FIG. 1 shows the state of the extrusion device before the start of extrusion, FIG. 2 shows it just before the end of extrusion, and FIG. Figure 3 shows the state at the end of extrusion.

A die 2 is arranged at one end of the opening 10 of the container 1. A mandrel 11 is attached to the pressurizing stem 3.
is attached so that it can move forward and backward.

Then, at the end of extrusion, the mandrel tip 12 passes through the unpressed part 5 and the die bearing 1
5, so as to protrude from the front surface of the pressurizing stem 3 through the through hole 14 of the dummy block 6 by the distance required for the pressurizing stem 3 to enter the dummy block 6.
Move the mandrel 11 forward, and the mandrel tip 1
2 into the billet 13 (see Figure 1). If extrusion is performed while maintaining the positional relationship between the mandrel tip 12 and the pressure stem 3 in this way,
When the distance between the mandrel tip 12 and the die bearing 15 is reduced to a certain length, as shown in FIG.
A hollow portion 16 is generated in the tail portion of the extruded material. If the extrusion is continued further, as shown in FIG. 3, when extrusion is completed, the mandrel tip 12 pushes out the remaining part 5 and enters the die bearing 15. Due to this approach, the unpressed material 5 is separated from the extruded material 8.

Although this example uses an indirect extrusion method, the present invention can also be applied to a direct extrusion method.

Effect of the invention The effects of the present invention are as follows.

(1) The limitations on the outer diameter of the extruded material due to the extruded material/unextruded material separation device, which the conventional technology has, are eliminated.

(2) In extrusion press equipment, since the diameter of the extruded material is increased, there is no need for a large-scale extruded material/unextruded material separation device or a large-scale modification thereof.

(3) No cutting means is required, the force required to separate the extruded material from the unextruded material is small, the separation is easy, and the idle time required for separation can be shortened.

(4) As a result of the above shortening, it becomes possible to die-quench the extruded material uniformly in the longitudinal direction. (In contrast to solution treatment, which involves cooling immediately after extrusion, according to the present invention, the interruption time of extrusion work for separation is short, so a uniform temperature can be maintained in the longitudinal direction of the extruded material.) 5) In carrying out the present invention, since no cutting means is used to separate the unextruded material, there is no sagging on the extruded material separation surface, which prevents accidents during automated processing of extrusion work that would occur due to sagging on the cut surface in the case of conventional technology. is avoided.

[Brief explanation of drawings]

Figures 1 to 3 explain embodiments of the present invention; Figure 1 shows the state of the extrusion device before the start of extrusion, Figure 2 shows it just before the end of extrusion, and Figure 3 shows the state of the extrusion device just before the end of extrusion. 4 is a cross-sectional view of the main part showing the state at the end of extrusion. FIG. ,b
Fig. 3 shows a state in which the unpressed material and the extruded material are separated by shearing, and Fig. 3c is a sectional view showing a state in which they are about to be separated by hot saw cutting. 1... Container, 2... Die, 3... Pressure stem, 4... Die stem, 5... Unpressed material, 6... Dummy block, 7... Shear, 8... Extruded material,
9...Hot saw, 10...Container opening, 1
1...Mandrel, 12...Mandrel tip, 1
3...Billet, 14...Through hole, 15...Die bearing, 16...Hollow part.

Claims (1)

[Claims] 1. A die is placed at one end of the opening in the container, and the billet charged into the opening is pressurized directly against the die by a pressure stem, or pressurized via the container and the pressure stem. In the method of extruding the billet into a rod-shaped body through the opening of the die by pressing, a mandrel that can move forward and backward is attached to the pressing stem, and the tip of the mandrel penetrates the unpressed part at the end of extrusion. Extrusion is performed with the mandrel advanced in advance from the front of the pressure stem so that it can enter the forming hole of the die, and at the end of extrusion, the mandrel is advanced into the forming hole of the die to create a space between the unextruded body and the rod-shaped body. A method for extruding a rod-shaped material of aluminum or its alloy, characterized by separating the unpressed material from the rod-shaped material while forming a hollow tubular portion.