JPH0976010A - Extruding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve the yield of extruded shapes by arranging a cooling system for cooling a seal member in a seal block. SOLUTION: A billet 13 is charged in the liner 1a of a container liner 1. A ring-shaped protrusion 80 is provided on the end face on the side of the extruding stem 14 of the container 1. A split ring-shaped seal block 40R which is freely opened and closed in the axial direction and crossed direction of the extruding stem 14 is provided. When the seal block 40R is closed, the seal block is made so as to simultaneously bring into contact with the outer peripheral surface of the ring-shaped protrusion and the outer peripheral surface of the extruding stem 14 through the seal member attached on the seal block 40R side. The cooling system for cooling the seal member is arranged in the seal block 40R. A cooling medium is blown toward the seal member from gas blowing-out ports 100, 101 and, simultaneously, depositions such as dirt and dust are blown away. In this way, the extruded shapes without blister are stably extruded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, during extrusion molding of an aluminum alloy or the like by an extrusion press, deaerates the air between the container and the billet to the outside of the container before the billet is extruded from the inside of the container through a die. The present invention relates to an improved extrusion molding apparatus for effectively extruding a billet without containing air.

[0002]

2. Description of the Related Art After a billet having a diameter slightly smaller than the inner diameter of the container is put into the container, the billet is pressed against the die by the rear extruding stem in the container, so-called upsetting, the billet is crushed and the space between the container and the billet is crushed. Air is compressed. In order to release the compressed air, the extrusion stem and the container are slightly retracted, the compressed air is extracted from the gap between the die and the container, and the container and the extrusion stem are advanced again to start extrusion. The degassing process of removing the compressed air in this way is called a burp cycle.
Waste time is generated in the extrusion cycle.

According to this method, when a container is pressed against a die by evacuating in a burp cycle, air remains at atmospheric pressure in a thin state of about one skin between the inner surface of the container and the outer surface of the billet. And sufficient degassing has not been performed.

Therefore, in order to easily and surely remove the residual air when extruding a billet, an airtight chamber is provided by a metal bellows between a container and an extrusion stem as described in Japanese Patent Publication No. 48-25315, for example. One end is sealed with a metal packing between the container and the other end with the extrusion stem, and the metal packing is pressed with a cylinder from outside using pneumatic or hydraulic pressure, and the air in the airtight chamber is discharged to the outside. Some are designed to eliminate residual air.

In Japanese Patent Application Laid-Open No. 52-47556, a disc-shaped support plate is provided at an appropriate position of an extrusion stem by using a carbon seal, and elasticity is provided by a spring provided between the rear wall surface of the container and the support plate. A method is described in which the inside of the container is suctioned and deaerated from between the dummy block and the inner peripheral wall surface of the container while sealing the inside of the container with a sealing material via a support that is in contact with the airtight relationship.

Further, Japanese Utility Model Publication No. 55-19605 discloses that a seal block is provided so as to be openable and closable in a direction perpendicular to the axial direction of the container, and when the seal block is closed, the inner surface of the seal block is formed with an extrusion stem. An arrangement which can be brought into close contact with the outer surface is described.

Such a two-part seal block opens and closes along a guide plate fixed to the upper and lower portions of the container end face on the extrusion stem side, and further seals the space between the extrusion stem and the container. Seal packing is provided between the cover plate and the seal block and between the extrusion stem and the inner surface of the seal block, and a deaeration groove 12 is provided on the inner surface of the container 1 on the upper side of the extrusion stem 3. And easy to degas.

Japanese Patent Application Laid-Open No. Hei 5-245533 discloses that a rim abutting on an end face of an extruding stem of a container and an edge portion which can slide back and forth with the extruding stem are hermetically sealed. A telescope-type elastic member is provided for pressing and holding the sealed container on the extruding stem side end surface of the container over the stroke. The telescope type is extended and the rim is brought into contact with the container end surface to seal the container. I have come to mind.

[0009]

However, the above-mentioned Japanese Patent Publication No. 48-25315 and Japanese Patent Application Laid-Open No. 52-47556.
And Japanese Patent Application Laid-Open No. 5-245533 have the following problems. In other words, a flexible sealing device such as a metal bellows, a spring, and a telescope-type elastic member that can extend and contract from the extrusion stem side toward the rear end surface of the container to completely remove residual air in the container when the billet is extruded. In addition, the deaeration space is expanded and deaeration time is required. In addition, the degree of vacuum is low due to insufficient sealing due to insufficient sealing.

When the billet is loaded in the container, the sealing device is once retracted to the ram side (the base of the extrusion stem), and after the extrusion stem is advanced, the billet is completely loaded into the container and the sealing device is advanced to seal the billet. Since the air in the container is vacuum-evacuated, the idle time becomes longer by the operating time of the sealing device.

Since the flexible sealing device is extended from the retracted position of the base of the extruding stem to the container end face for sealing, the front portion of the sealing device is bent by its own weight, and a gap is formed between the container end face and the sealing device. Tends to be insufficient.

A large pressing force is required to press the sealing device from the ram side toward the container side so that the sealing device sufficiently contacts the end surface of the container, which complicates the structure.

Under retracted conditions in the retracted position when the flexible sealing device is not used, the length of a conventional extrusion stem (conventionally required a sufficient length to extrude a billet loaded in a container) As a result, the length of the extruding press becomes longer by the shrinkage dimension of the sealing device, and as a result, the installation area becomes larger.

In JP-A-52-47556 and JP-A-5-245533, since the seal device and the extrusion stem are in relative contact with the extrusion stem in a state where they are always in contact, the The sliding surface of the extrusion stem and the sealing material are liable to wear, and the life of these sliding members is short.

In the case of (1), if the sealing device bends due to its own weight, the sealing device is more likely to hit against the extrusion stem, so that the life of the sliding member is more likely to be shortened.

In addition, the apparatus disclosed in Japanese Utility Model Publication No. 55-19605 has the following problems. That is, the split seal block is opened / closed along the guide plate arranged on the end face of the container, but the seal packing interposed between the seal block and the guide plate is opened / closed when the seal block is opened / closed. And the container is exposed to a high temperature (for example, 300 ° C or higher) due to the heat of the air heated while staying in the container, and because the guide plates are constantly rubbed, the seal packing is severely deteriorated and the life of the seal material is increased. There is a problem that it is short.

[0017] Further, when the extrusion stem that has completed the billet extrusion returns to the original position before the billet extrusion, the aluminum residue attached to the inner peripheral surface of the container liner is fixed by the fix dummy block provided at the tip of the extrusion stem. Since the aluminum powder scrapes off the outer peripheral surface of the dummy block and falls into the grooves of the guide plate, the opening and closing of the seal block becomes insufficient, resulting in poor sealing performance. The inside of the container, the so-called inner surface of the container liner, is provided with a deaeration groove on the upper side of the extrusion stem, so if you try to use such a container for another purpose, the use will be restricted and it will be used as a general-purpose machine It cannot be performed, and must be replaced one by one with the inner surface of the container liner having no deaeration groove, and a great amount of replacement time is required for such replacement of the container liner. A large external force acts on the container liner when the billet is upset.However, since the degassing groove is cut, concentrated stress acts on the cut portion of the degassing groove, and the mechanical strength decreases. is there.

The present invention has been made in view of the above problems. An object of the present invention is to perform container sealing immediately before degassing all the air in the container before extruding the billet in the container. It provides an extrusion cycle that does not require the above-mentioned degassing step called the barp cycle before extruding the billet from the die, and it also extrudes the billet by removing residual air and impurities that could not be removed by degassing the outer surface of the billet. The present invention provides an extrusion molding device that does not reduce the quality or yield of materials.

[0019]

In order to achieve the above object, according to the first aspect of the present invention, a ring-shaped protrusion is provided on the end surface of the container having a container liner for loading a billet on the extrusion stem side. A ring-shaped seal block that is openable and closable in a direction intersecting the axial direction of the extruding stem is provided, and when the seal block is closed, the ring-shaped protrusion is provided via a seal member attached to the seal block side. In the second invention having the first invention as its main constituent, the ring block is provided with a cooling device for cooling the seal member while allowing the outer circumferential surface and the outer circumferential surface of the extrusion stem to come into close contact with each other at the same time. A gas outlet for blowing off a cooling medium toward the seal member and at the same time for blowing off adhering substances such as dust is disposed inside the seal block. In a third aspect of the invention, which is mainly based on the first aspect, a ring-shaped seal block is disposed inside the seal block and has an inner seal block having the seal member, and an inner seal block disposed outside the inner seal block. And an outer seal block that holds the inner seal block, and the inner seal block has a first cooling medium passage radially surrounded by a lid and holding the inner seal block. The second cooling medium passage is provided between the outer cooling block and the outer seal block. Further, in the fourth invention mainly based on the first invention, the inner diameter of the ring-shaped protrusion provided on the end surface of the container on the extrusion stem side is made larger than the inner diameter of the container liner.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION When a billet in a container is pushed by an extrusion stem behind the billet and the billet is pressed against a die, the billet is crushed and the air between the container and the billet is compressed. This compressed air must be suctioned and evacuated from the back of the container before the billet is extruded from the die. In addition, the billet in the container must be pushed in by the extrusion stem behind the billet, and the gas must be suctioned and degassed from both sides of the container just before the tip of the billet is pressed against the die. In the present invention, since the air in the container is forcibly suctioned on the extrusion stem side of the billet before the billet is compressed by the extrusion stem, the process for sucking the compressed air after the billet is compressed by the extrusion stem is performed. The so-called degassing step can be omitted.

According to the present invention, when air is sucked from the extrusion stem side of the container, a ring-shaped protrusion is provided on the end face of the container on the extrusion stem side before the billet is compressed between the extrusion stem and the die. Then, while the container is sealed with a seal block that can be opened and closed in the axial direction, the air inside the container is vacuum-sucked and the air inside the container is smoothly degassed. By providing a substantially circular degassing groove with a larger diameter than the fixed damy block, the inner surface of the ring-shaped protrusion and the outer surface of the fixed damy block when the billet is loaded into the container by the extrusion stem. An air gap between the container and billet is easily degassed to the outside of the container because an annular gap is created between The yield is significantly improved. Further, the cooling medium passage is provided in the ring-shaped seal block to cool the ring-shaped seal block body while the cooling medium is flowing, and the cooling medium is directed toward the seal member inside the ring-shaped seal block. At the same time as spraying, the gas outlet that blows off dust and other deposits is opened, so that the cooling medium is continuously sprayed from the gas outlet toward the sealing member during opening and closing of the seal ring for cooling. As a result, the life of the seal member increases and
Deposits such as aluminum lees, dust, and dust that adhere to the inner peripheral surface of the seal block and the outer peripheral surface of the extrusion stem due to the gas blown out from the gas outlet even while the seal ring is being closed. Since it can be blown away and eliminated, the sealing property is increased, and vacuum deaeration with a higher degree of vacuum becomes possible.

[0022]

Embodiments of the extrusion molding apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system diagram of a suitable apparatus according to the present invention, FIG. 2 is a perspective view seen from AA of FIG. 1, FIG. 3 is an enlarged view of a main part of FIG. 2, and FIG. Enlarged front view,
FIG. 5 is an enlarged partial cutaway sectional view of a main part of the seal block, FIG.
2 is a cross-sectional view as seen from B to B in FIG. 2, FIG. 7 is an enlarged cut-away cross-sectional view of a main part of the seal material cooling device attached to the seal flock, and FIG. Fig. 9 is a comparative view of the case where the above is adhered, Fig. 9 is an explanatory view showing a scraped state of the aluminum lees attached to the inner peripheral surface of the container liner,
10 is a front view of the billet loader, FIG. 11 is an enlarged cross-sectional view of the protrusion, FIG. 12 is an enlarged cross-sectional view showing various shapes of the inner surface of the protrusion, and FIG. 13 is an explanatory diagram illustrating the mounting structure of the heat insulating seal block. 14 to 15 are operation diagrams showing a cooling medium spraying state simultaneously with the closing operation of the seal block, and FIG.
FIG. 4 is an explanatory diagram showing a pressure-extruded state of a billet loaded in a container.

As shown in FIG. 1, a container cylinder 33 for sliding the container 1 composed of the container liner 1a, the container tire 2 and the connate holder 1c is arranged on the end platen 32 side. Reference numeral 36 denotes a cylinder tube constituting a part of the cylinder body, 37 denotes a piston, and 38 denotes a piston rod.

Reference numeral 3 denotes a die, and the outer periphery of the die 3 is slidably fitted and held on the inner peripheral surface of the die ring 5. Reference numeral 31 denotes a gap between the inner peripheral surface of the container and the outer peripheral surface of the billet 13, which is also a degassing space.

On the other hand, the extrusion stem 1 for pushing the billet 13
4 is provided with a fixed dam block 70 that can be in close contact with the inner surface of the container 1.

In this embodiment, a vacuum suction device 60 for sucking and removing residual air in the degassing space 31 will be described.

First, a vacuum suction device 60 for removing air from the extrusion stem 14 side in the container 1 is shown in FIGS.
As shown in the figure, it is disposed on the end face of the container 1 on the extrusion stem 14 side. At the end surface of the container 1 on the extrusion stem 14 side, an annular seal block 40 having a donut shape on the front side is divided into two, and the seal blocks (40R, 4R,
Cylinders 43 (43R, 43R) are attached to the rear part of 0L).
L) piston rod 43R provided in the front and rear direction
It is fixed to the tips of a and 43La. Cylinder 43
Below the R and 43L, a first limit switch 72, a second limit switch 73, and a third limit switch 72 for detecting an opening / closing operation position between the backward limit position (open state) and the forward limit position (closed state) of the seal blocks 40R and 40L. Limit switches 74 are provided respectively. Then, the first limit switch 72
Detects the backward limit position (open state) of the seal blocks 40R, 40L, and the second limit switch 73 temporarily stops at a predetermined position where the seal blocks 40R, 40L are close to the extrusion stem 14. It is arranged to detect the movement. The third limit switch 74 is the seal block 40R, 40L.
Becomes 0N at a position closed with respect to the extrusion stem 14, the electromagnetic switching valve 90 for deaeration is excited, and the deaeration space 31
The vacuum tank 20 is connected to the vacuum tank 20, and the air in the container 1 is degassed.

Then, the piston rods 43Ra and 43L
With the back-and-forth movement of a, the two seal blocks 40R,
40L is a guide rod 42U (42
The container 1 is openable and closable along the UR, 42UL) and 42D (42DR, 42DL) in a direction perpendicular to the axial direction of the container 1.

The two seal blocks 40R, 4R
A pair of upper guide legs 62 (62R, 62L) are opposed to each other in the upper portion of each of the 0L contact surfaces 40A. Then, the guide rods 42U (42UR, 42UL) are fixed to the upper guide legs 62 (62R, 62L), respectively, and the seal blocks 40 (40R, 40L) are brought into and out of contact with the insertion rings 64 (64UR, 64UL) being inserted. It is free.

On the other hand, the two seal blocks 40 (40
R, 40L), a pair of lower guide legs 63 (63R, 63L) disposed opposite to each other near the contact surfaces 40A of the seal blocks 40R, 40L similarly to the upper guide legs 62.
The guide blocks 42D (42DR, 42DL) are fixedly mounted on the seal block 40, and the seal blocks 40 (40R, 40L) can be freely moved in and out of the state while the insertion rings 64 (64DR, 64DL) are inserted.

Then, as will be described later, the seal block 40 (40R, 40L) is divided into two parts.
An inner seal block 40A located inside of the inner seal block 40A having inner seal packings 41 and 44, and an inner seal block 4 located outside the inner seal block 40A.
The outer seal block 40B for holding 0A is separable from the outer seal block 40B. When the seal blocks 40R and 40L are closed as shown by a chain line in FIG.
A seal packing 46 (sheet-shaped sealing material) for preventing air from entering the contact surface 40A between the R and 40L is attached to the contact surface between the inner seal blocks 40A.

The seal packing 46 is preferably a sponge-like seal material having heat resistance and elasticity,
A material such as a silicone rubber sponge sheet or a fluoro rubber sponge sheet is preferable.

Further, when the seal blocks 40R and 40L are closed, the contact surface 40 of the inner seal block 40A is
The seal packings 46 stuck to A and the projections 80 described later via the seal packings 41 provided on the inner peripheral surfaces of the seal blocks 40R and 40L, and the fixed damy block 70 and the extrusion via the seal packings 44. The stem 14 is brought into close contact with the outer peripheral surface thereof.

Such seal packings 41, 44, 4
Of 6, the seal packings 41 and 44 are preferably made of a relatively hard material such as silicon rubber or string fluorine rubber, which is heat resistant and highly deformable. On the other hand, the seal packing 46 is preferably made of sponge-like soft rubber as compared with the seal packings 41 and 44, for example, a heat-resistant sponge-like material such as a silicone rubber sponge sheet or a fluorine rubber sponge sheet.

In particular, as shown in FIG. 8, when the split seal blocks 40R, 40L are closed with respect to the fixed damy block 70 and the extrusion stem 14, the outer peripheral surfaces of the fixed damy block 70 and the extrusion stem 14 and the seal packing. The friction between the seals 44 causes the seal packing 44 to move to the position shown in FIG.
As shown in (b), a gap S is generated at the end of the contact surface 40A by being pulled in the direction of the arrow.

Therefore, as shown in FIG. 8 (a), sponge-like soft rubber (thickness: 3 mm) is applied to the seal packing 46 of the contact surfaces 40A of the seal blocks 40R and 40L, which are divided in two.
Is adhered, the seal packing 46 is compressed by closing the seal blocks 40R and 40L, so that the free end of the compressed seal packing 46 protrudes toward the fixed dam block 70 and the extrusion stem 14 side. Thus, the generation of the gap S as described above is prevented. This has the same effect on the seal packing 41, and even when the seal packing 41 is in close contact with the outer peripheral surface of the projection 80, which will be described later, the gap S
Is prevented from occurring.

The seal block 40 is shown by the solid line in FIG.
When the R and 40L are retracted to the retreat limit, the billet loader 111 described below can enter and exit with the billet 13 placed thereon.

A degassing hole 45 is provided in each of the seal blocks 40R and 40L, and the flexible pipe 8a is provided in the degassing hole 45.
One end is connected, and the other end is provided with a fixed pipe 8 b via an electromagnetic switching valve 90, and is connected to the vacuum tank 20.

As shown in FIGS. 6 and 11, the container 1
The outer peripheral surface of the container liner 1a at the end surface of the extrusion stem 14 side is spliced to form a concave portion 50 concentric with the container liner 1a in the container tire 2 and a donut-shaped heat insulating material indicated by reference numeral 47 is fitted therein. I have. On this heat insulating material 47, a fitting member 51 having a projection 80 projecting in an L-shape in cross section toward the extrusion stem 14 side is mounted by a bolt 52 arranged at a constant pitch.

Further, reference numeral 56 is a ring-shaped projection, and since the heat insulating material 47 is made of a relatively soft material,
The fitting member 51 has a role of a stopper so as not to be compressed and deformed when the fitting member 51 is mounted on the extruding stem 14 side end surface of the container tire 2 by the bolt 52 after the fitting member 51 is disposed on the heat insulating material 47. Further, the heat insulating material 47 is the container 1
It also has a function as a sealing material for preventing the intrusion of air from the outside when vacuuming the inside air.

Further, a heat insulating pressing plate 48 is arranged at the outermost part of the container tire 2, and is mounted by screws 54 from the outside at a pitch circle position which is out of phase with the bolt 52. Further, a heat insulating ring 53 is fitted on the outer peripheral surface of the protrusion 80. In this way, the heat insulating material 47, the fitting member 51, which configures the heat insulating seal block 55,
The heat insulating press plate 48 is superposed and the fitting member 51 is provided.
By mounting the heat insulating ring 53 on the outer peripheral surface of the protruding portion 80, the temperature of the outer peripheral surface of the heat insulating ring 53 is about 200 ° C. or lower, and the average temperature of the container 1 is generally about 40 ° C. or less.
Although it is 0 ° C, the temperature is quite low. Therefore, even if the seal packing 41 is frequently contacted with the heat insulating ring 53 as the seal block 40 is opened / closed, the seal packing 41 is prevented from deteriorating due to thermal history, and the seal packing 41 from the container 1 side is prevented. A part of heat is prevented from being transferred to the vacuum suction device 60 by heat conduction, and further, the above-mentioned seal blocks 40R, 4
0L is arranged so as to be movable back and forth between the backward limit position and the forward limit position without sliding on the surface of the heat insulating pressing plate 48 disposed above the heat insulating material 47. As the material of the heat insulating material 47, for example, a material having a silica-based fine porous structure is preferable,
As the heat insulating seal block 55, for example, tool steel or heat resistant steel is used. Then, as the heat insulating press plate 48 and the heat insulating ring 53, for example, a highly functional resin is suitable.

Particularly, the end face side of the extrusion stem 14 of the container 1 of the extrusion press device for general-purpose machines shown in FIG. 13 (1) is entirely covered with a heat insulating seal block 55 as shown in FIG. 13 (2). Then, the end surface of the container 2 is projected toward the extrusion stem 14 side, and NO. In order to avoid such interference, for example, the length of the extrusion stem 14 is increased or the billet loader 111 itself does not move to the extrusion stem 14 side. Therefore, the billet loader 111 needs to be significantly modified.

Further, if the heat insulating seal block 55 is entirely covered, not only is the manufacturing cost high, but many bolts must be opened to attach the heat insulating seal block 55 to the end surface of the container tire 1a. There is a strength problem of 1.

In the present embodiment, as shown in FIG. 13 (3), the container tire 1a is provided with a donut-shaped recess 50 instead of simply covering the end surface of the container 2 with the heat insulating seal block 55. When the heat insulating seal block 55 is attached, the protrusion length of the protrusion 80 of the heat insulating press plate 48 may be short, and the size is short so as not to interfere with the protrusion 80 of the fitting member 51 constituting the heat insulating seal block 55. ． The billet liner 111c of the two billet loader 111b is exchanged. In addition,
In this embodiment, as described above, the billet liner 1
It is not limited to replacing the billet liner 111c modified so that the end surface of 11c and the projection 80 do not interfere with each other. For example, when providing a new extrusion press, the billet loader 111 is placed at a position where it does not originally interfere with the projection 80. It may be provided.

In this embodiment, when returning to the container 1 of the extrusion press device for a general-purpose machine as shown in FIG. 13A, the heat insulating seal block 55 is removed, and
This can be achieved by properly attaching the restoration block 57 such as 3 (5) with a bolt or the like not shown.

Further, as shown in FIG. 11, the inner diameter Y of the projection 80 provided on the heat insulating press plate 48 is larger than the inner diameter X of the container liner 1a (Y> X).
This is because the aluminum meal adheres to the tip enlarged diameter portion 49 of the fixed damy block 70 during extrusion, and the tip enlarged diameter portion 4
9, the inner diameter of the container liner 1a becomes the same as the inner diameter X of the container liner 1a.
Since the annular gap between them is formed, the air in the container 1 can be easily deaerated. Further, when the billet 13 is pushed into the container 1 by the push-out stem 14, the push-in can be easily performed. Therefore, the protrusion 8 is further provided at the end face of the protrusion 80 on the push-out stem 14 side.
While the billet 13 is easily pushed into the container 1 from the end face of the extruding stem 14 of 0, the enlarged diameter portion 49 of the distal end of the fixed damy block 70 of the extruding stem 14 can smoothly pass through the inner diameter of the protruding portion 80. The taper is attached. Further, the projection 80 of the container liner 1a
The side end surface also has a taper with an enlarged diameter, and is connected to the inner surface of the protrusion 80 following the tapered end.

When the enlarged tip 49 of the fixed damy block 70 passes through the inner diameter of the projection 80, an annular gap is formed between the enlarged tip 49 of circular shape and the inner diameter of the projection 80 of circular shape. However, without being limited to this, FIG.
As shown in (3), the protrusion 80a is partially provided on the inner diameter of the protrusion 80, so that a gap having an intermittent ring may be formed between the extrusion stems 14, or another gap may be formed. You may. As described above, on the extrusion stem 14 side of the fitting member 51, the projection 80 having a circular front surface is provided at a position corresponding to the container liner 1a, and the heat insulating ring 53 fitted to the outer peripheral surface of the projection 80. On the other hand, when the seal blocks 40R and 40L are closed, they are sealed via the seal packing 41. Reference numeral 21 is a vacuum pump, and 22 is a motor.

Further, a major feature of the present invention is that there is no cover plate or guide rail when the halved seal blocks 40R and 40L are opened and closed, and this is because the seal blocks 40R and 40L are opened as described above. In this case, the guide rods 42U and 42D
(64UL, 64UR, 64DL, 64DR).

Therefore, not only the container tire 2 and the container liner 1a can be easily replaced, but also as shown in FIG. 9, the extrusion stem 1 in which the extrusion of the billet 13 is completed.
A fixed dummy block 70 provided at the tip of the extrusion stem 14 when the billet 4 returns to the original position before the billet 13 was extruded.
Even if the aluminum dregs adhered to the inner peripheral surface of the container liner 1a are scraped off by the outer peripheral surface of the fixed damy block 70, the peeled aluminum dregs just drop downward from the tip of the inner peripheral surface of the projection 80. As in the past, the seal block 7 fell into the groove of the guide plate.
The opening and closing of 0 is not insufficient, and the sealing performance does not deteriorate.

Next, in this embodiment, the seal packing 41,
A cooling device 91 whose main purpose is to blow a cooling medium toward a sealing member such as 44 is provided. The seal block 40 (40R, 40L) divided in two is located inside the seal block 40, and the seal packing 4 is provided inside.
An inner seal block 40 </ b> A having 1, 44, and an outer seal block 40 that is located outside the inner seal block 40 </ b> A and holds the inner seal block 40 </ b> A.
The outer seal block 40 is configured to be separable into B and
It is attached to the inner seal block 40A from the outer side of B by a holding bolt 95 arranged at an appropriate pitch.

As shown in FIGS. 6 and 7, a semicircular concave groove is formed in the inner seal block 40A, and the lid 9 is formed.
The first cooling medium passage 96 is arranged by mounting the first cooling medium passage 8. The first cooling medium passage 96 has a slit shape in which a plurality of the first cooling medium passages are radially arranged, and the tip of the first cooling medium passage 96 is blown from the first gas outlet 100 opened to the side of the seal packing 44. The seal packing 44 is appropriately cooled by the cooling medium discharged.

A plurality of second cooling medium passages 97 communicating with the first cooling medium passage 96 are formed between the inner seal block 40A and the outer seal block 40B so as to face the first cooling medium passage 96. . The cooling medium introduced into the second cooling medium passage 97 appropriately cools the seal packing 41 by the cooling medium blown out from the second gas outlet 101 that is opened to the side of the seal packing 41. . Although the first cooling medium passage 96 and the second cooling medium passage 97 are connected to each other in this embodiment, the first cooling medium passage 96 and the second cooling medium passage 97 are not limited to this. You may provide independently without it.

One end of a flexible pipe 92 is connected to the outer seal block 40B, and a fixed pipe 94 is arranged at the other end through an electromagnetic switching valve 93 and connected to a cooling medium supply source (not shown). is there. First gas outlet 100 of inner seal block 40A and outer seal block 40
From the second gas outlet 101 of B, the seal block 40
The cooling gas is always blown out regardless of the backward limit position where L and 40R are opened or the forward limit position where they are closed.

Next, the billet loader 111 will be described with reference to FIGS. 2 and 10. The billet loader 111 shown in FIGS. 1 billet loader 111
a and No. The billet 13 as a molding material is transferred to and supplied to the billet loading port 126 of the container 1 by means of a two billet loader 111b. This is a billet carrier (shown in the figure) installed on one side of the molding machine. The billets 13 sent by (abbreviation) are gripped one by one and lifted to the billet loading port 126 of the container 1. In addition, No. 1 billet loader 111a and the No. 1 billet loader. The two billet loaders 111b have the same configuration.

Billets 13 are supplied one by one to the lower position of the container 1 by a billet carrier (not shown), and the billet loader 111 is constructed so as to grab and transport the billet to the billet loading port 126. . For this reason, the billet loader 111 is disposed to face the billet carrier, and has a swing arm 128 formed to be pivotable along a plane orthogonal to the extrusion center line of the molding machine.

That is, the swing arm 128 has one end pivotally attached to the swing center shaft 130 arranged on the outer side of the lower tie rod 129 of the molding machine, and has an expanded V-shape so as not to interfere with the tie rod 129 during the swing operation. It is bent and extends from the lower portion of the lower tie rod 129 to below the container 1. The distal end of the swing arm 128 is set to reciprocate between a mounting table (not shown) of the billet carrier and a billet loading port 126 of the container 1 by a swing operation.

In order to perform the swing operation, a hydraulic drive cylinder device 132 is connected to the swing arm 128, and the swing arm 128 is driven by the extension / contraction operation thereof.

Here, a billet holding portion 133 that holds the billet 13 is attached to the tip end portion of the swing arm 128. The billet holder 133 has a pedestal 134 for supporting the lower surface of the billet 13 at the container loading position.

The structure on the side of the extruding stem 14 is the same as when the fixed damy block 70 and the extruded stem 14 are bayonet-coupled via the bayonet block 72, and when the fixed damy block 70 and the extruded stem 14 are directly connected. In some cases, they may be screwed together.

In this embodiment, the fixed damy block 7 is used.
A detailed description will be given of a structure in which the extruding stem 14 and the extruding stem 14 are connected by bayonet.

The fixed damy block 70 is fixedly provided on the front surface of the extruding stem 14, and the container liner 1a.
It is slidably provided inside.

The rear end of the extruding stem 14 is fixed to the crosshead 75 via a stem holder 73 and a pressure ring 74 as shown in FIG.

A bayonet block 72 is provided on the front surface of the extruding stem 14, and a rear half of the bayonet block 72 is provided at the tip of a connection rod 76 having a circular outer cross section. It is screwed onto the screw.
The rear end of the connection rod 76 is a large-diameter portion 76a, and is engaged and fixed with a tapered surface in a hole at the rear end of the extrusion stem 14.

Next, the operation of the device will be described.

FIG. 14 (1) shows one seal block 40R of the opened seal block 40 as a representative, showing the first gas outlet 100 and the second gas outlet 101 provided in the inner seal block 40A. The cooling gas medium is constantly blown out from both sides toward the seal packing 44 and the seal packing 41, and when the seal block 40 is closed, the seal packing 44 and the seal packing 41 respectively contact the outer circumference of the extrusion stem 14 and the outer circumference of the heat insulating ring 53. The heat transferred by heat conduction from the container 1 side when coming into contact with each other is transferred to the seal packing 44 and the seal packing 41 to prevent the seal packing 44 and the seal packing 41 from receiving heat history and shortening the replacement time. is there. When compressed air is supplied to the cylinders 43R and 43L from this state, the seal block 40R is blown while the cooling gas medium is blown toward the seal packing 44 and the seal packing 41 from both the first gas outlet 100 and the second gas outlet 101, respectively. , 40L forward.

As the seal block 40R (40L) advances from the direction away from the extrusion stem 14 and the fixed damy block 70 to the direction close to the extrusion stem 14 and the fixed damy block 70, it is blown out from the first gas outlet 100 and the second gas outlet 101. By the cooling gas medium, the dust and the like attached to the outer peripheral surfaces of the heat insulating press plate 48 and the heat insulating ring 53 are blown off (FIG. 14 (2)).

When the seal block 40R (40L) comes closer to the extrusion stem 14 and the fixed damy block 70, the first gas outlet 100 and the second gas outlet 1
Due to the pressure of the cooling gas medium blown out from 01, dust and dirt adhering to the outer peripheral surfaces of the heat insulating press plate 48 and the heat insulating ring 53 are further blown off (FIG. 15).
(1)).

Even after the seal block 40R (40L) is in contact with the extrusion stem 14 and the fixed damy block 70, the first gas outlet 100 and the second gas outlet 10 continue.
Although the cooling gas medium is blown out from 1, the blown cooling gas medium is blocked by the seal packing 41 and the seal packing 44 so as not to communicate with the degassing space 31, and is discharged outward as shown in the drawing. Only (Fig. 15 (2)).

Next, the state where the billet 13 is crushed will be described with reference to FIG. As shown in FIG. 16, first, pressure oil is supplied to the rod side of the container cylinder 33, and the piston 3
7 is moved to the left, the container 1 apart from the die 3 is moved forward, and the die 3 and the container 1 are brought into contact with each other.

When this operation is completed, the two-divided seal blocks 40R and 40L are then connected to the first limit switch 72.
Are stopped at the retreat limit position while kicking respectively, and from this state, the billet 13 is raised with the billet loader 111 still mounted and the extrusion stem 14 is started to move forward at a constant speed, and at the same time, the split seal block 40R, 40L is also started to move forward (FIG. 16 (1)). The forward end of the billet 13 was gradually pushed into the container 1 by the forward movement of the extrusion stem 14, and the No. 1 billet loader a and N
o. The 2 billet loader b descends (FIG. 16 (2)).
On the other hand, the seal blocks 40R and 40L are the extrusion stem 14
The second limit switch 73 is kicked and temporarily stopped at a predetermined position close to the radial direction. At this time, the extrusion stem 1
4 continues to move forward, and when it reaches a predetermined position by a rotary encoder (not shown), the forward speed is reduced.

When the forward speed of the extrusion stem 14 is reduced, an electromagnetic valve (not shown) provided on the working medium introducing pipe of the cylinder 43 is excited, and the two-seal seal blocks 40R, 4
0L re-forwards at the above-mentioned speed, and finally stops at the forward limit position. At this time, the extrusion stem 14 is pushing the billet 13 by a predetermined length shown in FIG. 16 (3). When the two-divided seal blocks 40R, 40L reach the forward limit position, the third limit switch 74 is kicked to activate the vacuum suction device 60 and the electromagnetic switching valve 90 is excited, so that the space between the container 1, the die 3 and the billet 13 is increased. Vacuum suction is performed while the degassing space 31 and the vacuum suction device 60 are in communication with each other (FIG. 16 (3)).

The closed air in the deaeration space 31 passes through a deaeration hole 45 provided in a part of the split seal block 40,
It is sucked and discharged from the electromagnetic switching valve 90 on the pipe 8a to the vacuum tank 20 via the pipe 8b. Thus, the gas is quickly and sufficiently degassed from the degassing hole 45 of the seal block 40.

The inside of the vacuum tank 20 has already been
Is in a vacuum state of, for example, 0 to 5 Torr. First
As the extrusion stem 14 advances, the billet 13 becomes the container 1
However, at the time of the pushing, the enlarged diameter portion 49 of the fixed dam block 70 passes through the seal block 40 and closes the seal block 40.

When the electromagnetic switching valve 90 is excited in this state, the residual air in the container 1 becomes about 0.2 to 0.5 seconds when the vacuum suction is started by the vacuum tank 20 and becomes 5 to 30 Torr in the container 1. . And the extrusion stem 1
4 is advanced, and when the tip of the billet 13 hits the die 3, when the pressure oil in the side cylinder reaches a predetermined pressure, it is switched to the main cylinder (not shown) to complete the upset (FIG. 16 (4)). .

Thereafter, the extrusion stem 14 continues to advance without rest, and the billet 13 is crushed. Next, the extrusion is continued, and the product is extruded from the die 3. After the upset of the billet 13 is completed, the extrusion stem 14
After the extrusion of the product is started along with the advancement of the billet 13 (for example, one hour from the initial length before the extrusion of the billet 13 is started).
/ 3) The deaeration operation is stopped after elapse,
Subsequently, the seal block 40 (40R, 40L) is opened and immediately returned to the original retracted limit position. Thereafter, the extrusion by the extrusion stem 14 is performed. When the extrusion is completed, the extrusion stem 14 is retracted and the next molding cycle is started.

[0077]

As is apparent from the above description, according to the present invention, a seal is provided by closing the halved seal block arranged on the end surface of the container on the extrusion stem side in the direction intersecting the axial direction of the extrusion stem. Sufficient and high degree of vacuum, sufficient deaeration can be performed, and the entire length of the extrusion press device does not become long. By providing a substantially annular degassing groove on the inner surface of the ring-shaped protrusion on the extrusion stem side, aluminum dregs adhered to the enlarged diameter portion on the tip of the fixed damy block, which increased the diameter of the enlarged tip portion. Even if the air inside the container is degassed, extruded profile without blisters can be stably extruded, and the yield of extruded profile of products can be improved significantly. . The idle time is short because the sealing time of the two seal blocks is short. When the two-piece seal block is closed, the ring-shaped projection and the extrusion stem are separated from each other immediately before they are brought into contact with each other at the same time, and the life of the seal packing is long. Even after extruding the billet and scraping the aluminum residue with the outer peripheral surface of the fixed dummy block and dropping it outside the container when retracting the extrusion stem, the split block is not opened along the groove etc. High sealing performance can be maintained without clogging with aluminum residue. Since it is not necessary to perform the barp cycle as in the conventional case, the idle time can be shortened. A donut-shaped groove is cut in the end face of the container on the extrusion stem side, and a heat-insulating seal block made of heat-insulating material is attached to the required minimum, so that the container side required for heating residual air in the container from the container side Since heat transfer can be prevented and the heat-insulating seal block is attached to only a part of the end face of the container on the side of the extrusion stem, the number of bolt attachment holes drilled in the end face of the container can be reduced, so that the mechanical strength does not decrease.

[Brief description of drawings]

FIG. 1 is a system diagram of a preferred apparatus according to the present invention.

FIG. 2 is a perspective view as viewed from A to A in FIG. 1;

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an enlarged front view of a main part of a seal block.

FIG. 5 is an enlarged partial cutaway sectional view of a main part of a seal block.

FIG. 6 is a cross-sectional view as seen from BB of FIG.

FIG. 7 is an enlarged cut sectional view of a main part of a seal material cooling device attached to a seal block.

FIG. 8 is a comparative diagram of a case where a sealing material is attached to the contact surface between the two divided seal blocks.

FIG. 9 is an explanatory view showing a scraped state of aluminum lees attached to the inner peripheral surface of the container liner.

FIG. 10 is a front view of the billet loader.

FIG. 11 is an enlarged cross-sectional view of a protrusion.

FIG. 12 is an enlarged cross-sectional view showing various shapes of the inner surface of the protrusion.

FIG. 13 is an explanatory diagram illustrating a mounting structure of a heat insulating seal block.

FIG. 14 is an operation diagram showing a cooling medium spraying state simultaneously with the closing operation of the seal block.

15 is an operation diagram showing the next operation state shown in FIG. 14. FIG.

FIG. 16 is an explanatory diagram showing a state in which a billet loaded in a container is extruded under pressure.

[Explanation of symbols]

 1 Container 2 Container Tire 3 Die 13 Billet 14 Extrusion Stem 20 Vacuum Tank 21 Vacuum Pump 31 Deaeration Space 32 End Platen 33 Container Cylinder 40 (40R, 40L) Seal Block 40A Inner Seal Block 40B Outer Seal Block 41, 44, 46 Seal Packing 42 Guide plate 45 Degassing hole 47 Insulating material 48 Insulating retainer plate 50 Recessed portion 51 Fitting member 53 Insulating ring 55 Insulating seal block 57 Recovery block 60 Vacuum suction device 70 Fixed damy block 72 First limit switch 73 Second limit Switch 74 Third limit switch 80 Projection portion 90 Electromagnetic switching valve 91 Cooling device 92 Flexible piping 93 Electromagnetic switching valve 94 Fixed piping 95 Holding bolt 96 First cooling medium passage 97 Second cooling Rejecting medium passage 98 Lid body 100 First gas outlet 101 First gas outlet 111 Billet loader 111a No. 1 Billet Loader 111b No. 2 Billet loader 126 Billet loading port 128 Swing arm 129 Lower tie rod 130 Revolving central axis 132 Hydraulic drive cylinder device 133 Billet holder 134 Pedestal

Claims (4)

[Claims] 1. A ring-shaped protrusion provided on an end surface of a container having a container liner for loading a billet on the side of an extrusion stem, and a ring-shaped seal that can be opened and closed in a direction intersecting with an axial direction of the extrusion stem. A block is provided so that when the seal block is closed, the outer peripheral surface of the ring-shaped protrusion and the outer peripheral surface of the extrusion stem can be simultaneously brought into close contact with each other via a seal member attached to the seal block side. An extrusion molding apparatus, characterized in that a cooling device for cooling the seal member is provided in the. 2. Inside the ring-shaped seal block according to claim 1, a gas outlet is provided for blowing a cooling medium toward the seal member and at the same time blowing off adhered substances such as dust and dirt. Characteristic extrusion molding equipment. 3. The ring-shaped seal block according to claim 1, wherein the inner seal block is located inside the seal block and has the seal member, and the inner seal block is located outside the inner seal block and holds the inner seal block. And an outer seal block that holds the inner seal block and that has a first cooling medium passage that is surrounded by a lid and is radially arranged in the inner seal block. An extrusion molding apparatus, characterized in that a second cooling medium passage is provided therebetween. 4. An extrusion molding apparatus, wherein the inner diameter of a ring-shaped protrusion provided on the end surface of the container on the extrusion stem side is larger than the inner diameter of the container liner according to claim 1.