JPH0970614A - Extrusion molding equipment - Google Patents

Abstract

[PROBLEMS] To establish a highly reliable degassing method that does not require a burp cycle and to prevent the quality or yield of an extruded shape from being reduced by mixing with a blister. A ring-shaped protrusion is provided on an end surface of a container having a container liner into which a billet is loaded, on the side of the extrusion stem, and a seal block that is openable and closable in a direction intersecting the axial direction of the extrusion stem is provided. 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 the seal member attached to the seal block side, and the inner surface of the ring-shaped protrusion is closer to the extrusion stem. A degassing groove was provided.

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, and an object of the present invention is to remove all air in a container before performing container sealing and extruding billets in the container. It provides an extrusion cycle that does not require the degassing step called a burp cycle before extruding a billet from a die, and lowers the quality or yield of extruded profiles due to the inclusion of air and impurities on the outer surface of the billet. An object of the present invention is to provide an extrusion molding apparatus that does not allow the extrusion to occur.

[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. Providing a split seal block that can be freely opened and closed in the direction intersecting the axial direction of the extrusion stem,
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, and the inner surface of the ring-shaped protrusion is In the second invention, which has the degassing groove on the side of the extrusion stem and has the first invention as a main body, the degassing groove is substantially larger than the outer diameter of the fixed damy block attached to the tip of the extrusion stem. In the third invention mainly composed of the first invention, which is a circular deaeration groove, the deaeration groove is an intermittent annular deaeration having unevenness between fixed damy blocks attached to the tip of the extrusion stem. It was a groove. Furthermore, in the fourth invention mainly based on the first invention,
The deaeration groove was configured so that the diameter was increased toward the extrusion stem side. In a fifth aspect of the invention, which is mainly based on the first aspect, a fitting member having a ring-shaped protrusion is engraved in a donut-shaped recess formed on the end surface of the container on the extrusion stem side, and a heat insulating material is provided outwardly. A fitting member having a ring-shaped protrusion, in which the fitting member and the heat insulating press plate are superposed in this order, is fitted in a doughnut-shaped recess carved on the end surface of the container on the side of the extrusion stem, and the heat insulating material is fitted to the outside. The mating member and the heat insulating press plate are arranged in this order so as to overlap with each other, and in the sixth invention mainly based on the first invention, the heat insulating ring is fitted and arranged on the outer peripheral surface of the ring-shaped protrusion.

[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 the air is sucked from the extruding stem side of the container, the billet has the same inner diameter as the inner surface of the container at the extruding stem side container end surface before being compressed between the extruding stem and the die. The air inside the container is vacuum-sucked and the air inside the container is smoothly degassed while the ring-shaped protrusion is installed and sealed with the seal block that can be opened and closed in the axial direction of the container. As described above, the ring-shaped protrusion is provided with a substantially circular degassing groove having a diameter larger than that of the fix damy block, so that the inner surface of the ring-shaped protrusion when the billet is loaded into the container by the extrusion stem. Since an annular gap is created between the container and the outer surface of the fixed damy block, the air between the container and billet is easily degassed to the outside of the container. Therefore, product yield is significantly improved due to the occurrence prevention of the blister.

[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 a comparative view when a sealing material is attached to the abutting surface of the two divided seal blocks, and FIG. 6 is an explanatory view showing a scraped state of the aluminum lees adhering to the inner peripheral surface of the container liner, FIG. Is a front view of the billet loader, and FIG.
FIG. 10 is a cross-sectional view seen from B, FIG.
FIG. 11 is an enlarged cross-sectional view showing various shapes of the inner surface of the protrusion, FIG. 11 is an explanatory view for explaining the mounting structure of the heat-insulating seal block, and FIG. 12 is an explanatory view for showing the pressure-extruded state of the billet loaded in the 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.

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.

When the seal blocks 40R and 40L are closed as shown by the chain line in FIG.
A seal packing 46 (sheet-like sealing material) is attached to prevent air from entering from the contact surface 40A between the R and 40L.

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.

When the seal blocks 40R and 40L are closed, the contact surfaces 4 of the seal blocks 40R and 40L
0A, the sealing packings 46 attached to each other and the sealing packings 41 provided on the inner peripheral surfaces of the sealing blocks 40R and 40L, and a projection 80 described later, and the sealing packing 44, the fixed damy block 70 and the extrusion. 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. 5, when the two-piece seal blocks 40R and 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 as 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. 5 (a), a sponge-like soft rubber (thickness: 3 mm) is formed on the seal packing 46 of the contact surface 40A of each of the seal blocks 40R and 40L.
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. 8 and 9, the outer peripheral surface of the container liner 1a at the end surface of the container 1 on the side of the extrusion stem 14 is in contact with the outer peripheral surface of the container liner 1 by a spigot.
A concave portion 50 concentric with a is formed, and a donut-shaped heat insulating material denoted by reference numeral 47 is fitted therein. 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.

In particular, the end face side of the extrusion stem 14 of the container 1 of the extrusion press device for a general-purpose machine shown in FIG. 11 (1) is entirely covered with a heat insulating seal block 55 as shown in FIG. 11 (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 this embodiment, as shown in FIG. 11 (3), the container tire 1a is provided with a doughnut-shaped recess 50 instead of entirely 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 projection length of the projection 80 of the heat insulating press plate 48 can be short, and the size of the heat insulating press plate 48 constituting the heat insulating seal block 55 is short so as not to interfere with the projection 80. ． The billet liner 111c of the two billet loader 111b is exchanged.

In this embodiment, when returning to the container 1 of the extrusion press device for general-purpose machines as shown in FIG. 11 (1), the heat insulating seal block 55 is removed, and
This can be achieved by properly attaching the restoration block 57 such as 1 (5) with a bolt or the like not shown.

Further, the inner diameter Y of the projection 80 provided on the heat insulating press plate 48 is as shown in FIG.
It is configured to be larger than the inner diameter X of a (Y> X). This is because aluminum lees are attached to the enlarged tip portion 49 of the fixed damy block 70 during extrusion, and
Even if the diameter becomes larger than the inner diameter X of the container liner 1a, the air inside the container 1 is easily formed because the annular gap between X and Y is formed in the inner diameter Y of the protrusion 80. You can degas. Also, the extrusion stem 1
4 allows the billet 13 to be easily pushed into the container 1 when the billet 13 is pushed into the container 1. Therefore, the protrusion 80 is further attached to the end face of the protrusion 80 on the extrusion stem 14 side.
The billet 13 from the end face of the extruding stem 14 of the container 1
An enlarged taper is provided so that the enlarged diameter end portion 49 of the fixed damy block 70 of the extruding stem 14 can smoothly pass through the inner diameter of the protrusion 80 while being easily pushed in. Further, the end face of the container liner 1a on the side of the protrusion 80 is also tapered so as to have 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 can the container tire 2 and the container liner 1a be easily replaced, but as shown in FIG. 6, the extrusion stem 1 in which the extrusion of the billet 13 has been 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, the billet loader 111 will be described with reference to FIGS. The billet loader 111 shown in FIGS. 1 billet loader 111a and the No. 1 billet loader. It consists of two billet loaders 111b,
The billet 13 as a molding material is transported and supplied to the billet loading port 126 of the container 1, and the billet 13 sent by a billet carrier (not shown) installed on one side of the molding machine is supplied to the billet 13. The container is grasped one by one and lifted and moved 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 connected to a turning center shaft 130 disposed outside the lower tie rod 129 of the molding machine, and has an enlarged V-shape so as not to interfere with the tie rod 129 during a swing operation. It is bent and extends below the container 1 from the lower part of the lower tie rod 129. 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 a 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 for holding the billet 13 is attached to the tip 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 is also a 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.

The crushed state is shown in FIG. FIG.
As shown in 2, first, pressure oil is supplied to the rod side of the container cylinder 33 to move the piston 37 to the left,
The container 1 distant from the die 3 is advanced to bring the die 3 into contact with the container 1.

When this operation is completed, the billet 1
When the billet loader 111 is raised and the extrusion stem 14 is moved forward (Fig. 12 (1)) while the 3 is placed, the billet 13 is pushed into the container 1 (Fig. 12 (2)). Then, the rear end of the billet 13 is pushed to a position near the end face side of the extrusion stem 14 in the container 1. At this time, the deaeration space 31 between the container 1, the die 3 and the billet 13 and the vacuum suction device 60 Be in communication.

In this state, the cylinder 43 is operated to close the halved seal block 40 to seal the space between the extrusion stem 14 and the container 1 and activate the vacuum suction device 60 to excite the electromagnetic switching valve 90. Vacuum suction is performed under the condition that the inside of the container 1 and the vacuum tank 20 can be ventilated (FIG. 12 (3)).

The closed air on the side of the extrusion stem 14 passes through a deaeration hole 45 provided in a part of the split seal block 40, and from the electromagnetic switching valve 90 on the pipe 8a to the vacuum tank 20 via the pipe 8b. Is sucked and discharged. 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 is already the vacuum pump 21.
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 5 to 30 Torr in 0.2 to 0.5 seconds after the vacuum suction by the vacuum tank 20 is started. . 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) and the upset is completed (Fig. 12 (4)). .

After that, the extrusion stem 14 continues to move forward without a break, 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.

[0069]

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

FIG. 6 is an explanatory view showing a scraped state of aluminum lees attached to the inner peripheral surface of the container liner.

FIG. 7 is a front view of the billet loader.

FIG. 8 is a cross-sectional view as seen from BB of FIG.

FIG. 9 is an enlarged cross-sectional view of a protrusion.

FIG. 10 is an explanatory diagram illustrating a mounting structure of a heat insulating seal block.

FIG. 11 is an enlarged cross-sectional view showing various shapes of the inner surface of the protrusion.

FIG. 12 is an explanatory diagram showing a pressure-extruded state of a billet loaded in a container.

[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 41, 44, 46 Seal Packing 42 Guide Plate 45 Deaeration Hole 47 Heat Insulating Material 48 Heat Insulating Pressing Plate 50 Recessed 51 Fitting Member 53 Heat Insulating Ring 55 Heat Insulating Seal Block 57 Recovery Block 60 Vacuum Suction Device 70 Fixed Damy Block 80 Projection 90 Electromagnetic Switching Valve 111 (111a, 111b) Billet Loader 126 Billet Loading port 128 Swing arm 129 Lower tie rod 130 Revolving central axis 132 Hydraulic drive cylinder device 133 Billet holding part 134 Pedestal

Claims (6)

[Claims] 1. A ring-shaped projection is provided on an end surface of a container having a container liner to be loaded with a billet on the side of an extrusion stem, and a split seal block which is openable and closable in a direction intersecting the axial direction of the extrusion stem is provided. 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, and the inner surface of the ring-shaped protrusion is An extrusion molding apparatus characterized in that a degassing groove is provided on the extrusion stem side of the. 2. The extrusion molding apparatus according to claim 1, wherein the deaeration groove is a substantially circular deaeration groove larger than the outer diameter of the fixed damy block attached to the tip of the extrusion stem. 3. The extrusion molding apparatus according to claim 1, wherein the deaeration groove is an intermittent annular deaeration groove having irregularities between fixed damy blocks attached to the tip of the extrusion stem. 4. An extrusion molding apparatus, wherein the degassing groove according to claim 1 is configured so as to have a diameter enlarged toward an extrusion stem side. 5. A doughnut-shaped recess formed by engraving the fitting member having the ring-shaped projection according to claim 1 on the end surface of the container on the extrusion stem side, the heat insulating material, the fitting member, and The heat insulating material, the fitting member, and the heat insulating presser are outwardly placed in a doughnut-shaped concave portion formed by engraving a fitting member having a ring-shaped protruding portion, which is arranged in the order of the heat insulating press plate, on the end surface of the container on the extrusion stem side. An extrusion molding device, characterized in that the plates are superposed in this order. 6. An extrusion molding apparatus, wherein a heat insulating ring is fitted and arranged on an outer peripheral surface of the ring-shaped protrusion according to claim 1.