JPS6261720A - Extrusion method for bar like material of aluminum or its alloy - Google Patents

Abstract

PURPOSE:To facilitate the separation of the extrusion material after completion of the extrusion from the remainder by fitting a freely advancing and retreating mandrel to a pressure stem, by approaching the mandrel into the formed open hole of a die and by separating a bar line body from the extrusion remainder. CONSTITUTION:A pressure stem 3 is advanced in the arrow mark direction via the dummy block 6 having the through hole 14 of the mandrel tip 12, after charging a billet 13 from the other end for a die 2 into the open hole 10 of a container 1. A bar like body 8 is extruded through the open hole tip of the die 2 with the billet 13 being pressed. At the extrusion completing time an extrusion remainder 5 is caused and the state of the mandrel tip 12 rushing into the extrusion remainder 5 is caused as well. The tip 12 is approached into the die bearing 15 of the die 2 by penetrating the remainder by advancing the mandrel in succession and the tail part of the extrusion material 8 is parted from the remainder 5. The remainder 5 is then removed by shearing together with the die 2 and dummy block 6 by advancing the container 1 and by retreating the stem 3.

Description

[Detailed Description of the Invention] The present invention relates to a method for extruding a rod-shaped body made of aluminum or its alloy material, and more specifically, after the end of extrusion, the unextruded material is separated from the extruded material. The present invention relates to a method for extruding the rod-shaped body that facilitates the extrusion of the rod-shaped body.

After charging a billet of aluminum or its alloy into the opening of the container, a die is placed at one end of the opening, and a pressure stem is placed at the other end to push the billet through a dummy block. An indirect extrusion method is used in which the pressurized stem and container are moved integrally toward the die and the billet is extruded through the die opening to obtain a rod-shaped body.Separately, the container is placed in place and the container is opened. A direct extrusion method is used in which the billet in the hole is directly pressed by a pressure stem through a dummy block and extruded into a rod-shaped body 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 is separated from unextruded material. The state when separated by shearing is shown, and C 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, and then moved upward. The mounting shear 7 is lowered to shear and separate the unextruded material 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 placed in the container 1.
The dummy block is exposed to the outside and sheared between the die 2 and the unpressed part 5 to separate the unpressed part 5 and the dummy block 6. In the case of hot saw cutting, move the container 1 in the direction of the arrow, move the die stem 4 in the same direction, and pressurize the stem 3.
is moved in the opposite direction to expose the die 2, the remaining press 5, and the dummy block 6, and the tail of the extruded material 8 is exposed between the die 2 and the die stem 4, and the hot saw 9 is lowered and cut at the tail. , the remaining press 5 is separated together with the die 2 and the dummy block 6.

The problem that Akira is trying to solve Conventionally, to separate the unextruded material after extrusion using an extrusion device, methods using shear shearing and hot sawing have been used as described above, but these methods have had the following problems.

That is, the size of the outer diameter of the extruded material is limited by the capacity of the shear 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, during shearing or cutting for separation, sagging occurs on the cut surface and 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, which facilitates the separation of the extruded material and the unextruded material after extrusion, and thereby enables The purpose of this invention is to solve problems such as restrictions on the outer diameter of the extruded material in the extrusion method.

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

That is, in the present invention (1), a die is arranged at one end of the opening of the container, and the billet charged into the opening is directly pressurized against the die by a pressurizing stem; In the method of extruding the billet into a rod-shaped body through an opening in the die by applying pressure through the container and the pressure stem, a mandrel that can move forward and backward is attached to the pressure stem, and when extrusion is finished, the billet is pressed. This method includes a step of inserting a mandrel into the molding hole of the die to separate the remaining press and the rod-shaped body.

In the present invention (2), in the above configuration of the present invention (1),
The point that determines the position of the tip of the mandrel with respect to the pressure stem is changed to a point that determines the position so that the tip of the mandrel passes through the unpressed area at the end of extrusion.

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

Example 1 Figure 1 shows an embodiment of the present invention, in which a shows the state of the extrusion device before the start of extrusion, b shows the state at the end of extrusion, and C shows the state after the end of extrusion. The state in which the mandrel is advanced and penetrates through the remaining press is shown.

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 so as to be movable forward and backward. Before starting extrusion, the mandrel 11 is fixed to the pressure stem 3 in advance so that the mandrel tip 12 protrudes from the front surface of the dummy block 6 and the mandrel tip 12 is located a predetermined distance from the front surface of the pressure stem 3. I'll keep it. At the end of extrusion, this distance is
The tip 12 of the mandrel 11 is set so as to protrude into the unpressed portion 5 by an arbitrary length.

Next, after loading the billet 13 into the opening 10 of the container 1 from the other end toward the die 2, the billet 13 is inserted into the through hole 14 of the mandrel tip 12 while the positional relationship between the mandrel tip 12 and the pressure stem 3 is fixed. is applied to the end of the billet via a dummy block 6 having It is extruded into a rod-shaped body 8 through the aperture light. At the end of extrusion, the first
As shown in the figure, an unpressed area 5 is generated and the mandrel tip 12 enters into the unpressed area 5.

Subsequently, as shown in FIG. 1C, the mandrel 11 is released from the fixed state and moved forward until the remaining 5
through the die bearing 1 of the die 2 and insert its tip 12 into the die bearing 1 of the die 2.
5, mandrel 11 and die bearing 1
Since the gap with 5 is about 1 mm, the mandrel tip 12
Due to the above-mentioned approach, the unpressed portion 5 is separated from the tail portion of the extruded material 8. Next, the container 1 is advanced, and the pressurizing stem 3
, move the remaining press 5 back to the die 2 and dummy block 6.
Remove it with a shear.

Example 2 FIG. 2 shows another embodiment of the present invention, in which a is the state before the start of extrusion, b' is the state just before the end of extrusion, and C is the state at the end of extrusion. In this example, the mutual relationship between the positions of the mandrel tip 12 and the pressure stem 3 determined before the start of extrusion in Example 1 is changed as follows, and extrusion is performed in the same manner.

That is, at the end of extrusion, the mandrel tip 12
The dummy block 6 passes through the remaining press 5 and enters the die bearing 15.
The mandrel 11 is advanced so that the mandrel tip 1 is in a position protruding from the front surface of the pressure stem 3 through the
2 into the billet 13. If extrusion is performed while maintaining the positional relationship between the mandrel tip 12 and the pressurizing 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 extrusion is continued further, the mandrel tip 12 returns to the unextruded portion 5 and enters the die bearing 15 when extrusion is completed, as shown in FIG. By this approach, the unpressed material 5 is separated from the extruded material 8.

Example 3 FIG. 3 shows a roughly different embodiment of the present invention, in which a shows the state immediately before the end of extrusion, and b shows the state at the end of extrusion.

In this example, an apparatus is used in which the outer diameter of the mandrel 11 is smaller than that of the extrusion apparatus used in Examples 1 and 2. Therefore, the mandrel 11 and die bearing 15 of this device
The gap between them is comparable to that of a conventional extrusion device for tubular objects. Note that the die 2 is of a fixed type.

During the extrusion process, extrusion is performed with the positional relationship between the mandrel 11 and the pressure stem 3 being the same as in Example 2. As the extrusion progresses, a hollow portion 16 is generated in the tail of the extruded material 8 from the time when the mandrel tip 12 approaches the die bearing 15, and if extrusion is continued, at the end of the extrusion,
As shown in FIG. 3b, a pipe hole 17 is formed. As a result, the tail portion of the extrusion 8 has a substantially reduced cross-sectional area.

Next, the container 1 and the die stem 4 are moved forward, and the pressure stem 3 is moved back to expose the tail portion of the extruded material 8, the unpressed portion 5, and the dummy block 6. The exposed tail end of the extruded material 8 is cut off with a hot saw to separate the unextruded material 5 together with the dummy block 6.

Although Examples 1 to 3 are all based on indirect extrusion, the present invention can also be applied to direct extrusion.

Tan V■ The effects of the present invention are as follows.

(1) Restrictions on the outer diameter of the extruded material due to the extruded material/unextruded material separation device, which are present in the prior art, 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) It is possible to shorten the idle time of extrusion required to separate the extruded material and the unextruded material.

(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 along the length of the extruded material.) (5) When carrying out the present invention, in particular, if no cutting means is used to separate the unpressed material, or even if a cutting means is used,
Since the cross-sectional area of the part to be cut is small, there is no sagging on the extrusion phase separation surface, so accidents in automated extrusion processing that would occur due to sag on the cut surface in the case of conventional techniques can be avoided.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which a shows the state of the extrusion device before the start of extrusion, b shows the state at the end of extrusion, and C shows the state of the extrusion device when the mandrel is advanced after the end of extrusion. FIG. 2 shows another embodiment of the present invention, in which a shows the state of the extrusion device before the start of extrusion, and b shows the state just before the end of extrusion. FIG. 3 shows another embodiment of the present invention, and a shows the state of the extrusion device just before the end of extrusion. , b is a cross-sectional view of the main part showing the state at the end of extrusion, and FIG. , b shows the state when the unpressed material and the extruded material are separated by shearing, and C shows the state when the unpressed material and the extruded material are separated by shearing.
FIG. 3 is a cross-sectional view showing a state where separation is to be performed by saw cutting. 1... Container, 2... Die, 3... Pressure stem, 4... Die stem, 5... Remaining press, 6... Dummy block, 7... Shear, 8... Extrusion Material, 9.
...Hot saw, 10...Container opening, 11...
・Mandrel, 12...Mandrel tip, 13...
Billet, 14...Dummy block through hole, 15...Die bearing, 16...Hollow part, 17...
・Pipe hole. Patent Applicant Sumitomo Light Metal Industries Co., Ltd. Agent Patent Attorney Hide Komatsu Agent Patent Attorney Hiroshi Asahi Figure 2 Figure 3

Claims (2)

[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 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 pressurizing the billet with 1. A method for extruding a rod-shaped body of aluminum or an alloy thereof, comprising the step of advancing the rod-shaped body and separating the unextruded body from the rod-shaped body. (2) 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 the container and the pressurizing stem are In the method of extruding the billet into a rod-shaped body through the opening of the die by applying pressure through the pressurizing stem, a mandrel that can move forward and backward is attached to the pressurizing stem, and when extrusion is finished, the mandrel is inserted into the forming opening of the die. 1. A method for extruding a rod-shaped body of aluminum or its alloy, comprising the step of forming a hollow tubular portion between the unpressed portion and the rod-shaped body.