JP3159003B2 - Extrusion molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruder for extruding an aluminum alloy or the like by using an extrusion press to degas air between the container and the billet before the billet is extruded from the container through a die. The present invention relates to an extrusion molding apparatus capable of shortening idle time and obtaining an extruded product without air entrainment.

[0002]

2. Description of the Related Art After a billet having a diameter slightly smaller than the inside diameter of a container is placed in the container, the billet is pressed against a die with a rearward extrusion stem in the container. 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. Seals are 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 is provided on the inner surface of the container on the extrusion stem side. It is easy to do.

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.

In order to extend and seal the flexible sealing device from the retracted position of the base of the extrusion stem to the container end surface, the front portion of the sealing device is bent by its own weight, and a gap is formed between the container end surface and the sealing device. Tends to be insufficient.

In order to press the seal device from the ram side toward the container side so that the seal device sufficiently contacts the container end face, a large pressing force is required, 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 above case, if the front portion of the sealing device is bent by its own weight, the sealing device is more likely to come into contact with the extrusion stem, so that the life of the sliding member is more likely to be shorter.

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 and closed along a guide plate provided on the end face of the container. When the seal block is opened and closed, the seal packing interposed between the seal block and the guide plate receives heat from the container side. In addition to being exposed to a high temperature (for example, 300 ° C. or more) due to the retained heat of the air heated while staying in the container, the seal gasket is constantly rubbed between the guide plates, so that the seal packing is significantly deteriorated and the life of the seal material is extended. There is a problem such as short.

Further, when the extruding stem which has completed the extruding of the billet returns to its original position before extruding the billet, the aluminum dust adhered to the inner peripheral surface of the container liner is fixed by the fixing dummy block provided at the tip of the extruding 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 also extrudes the mold by mixing residual air and impurities that could not be obtained by degassing the outer skin of the billet. An object of the present invention is to provide an extrusion molding apparatus in which the quality or yield of a material is not reduced.

[0019]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a ring-shaped projection provided on an end face of a container having a container liner in which a billet is loaded, on an extrusion stem side. A pair of split ring-shaped seal block rotating bases which can be opened and closed in a direction intersecting with the axial direction of the pushing stem above the container end surface on the pushing stem side, and one end of a swing arm fixed to the rotating base. A second ring-shaped seal block fixed to the other end, and a seal member attached to the seal block contact surface when the seal block is closed. A rod in which the above-mentioned split seal block capable of being simultaneously brought into close contact with the outer peripheral surface of the dummy block or the extrusion stem is engaged with a cylinder mounted on a tie rod. In the second invention, which is mainly attached to the first invention, the second seal block is attached to a distal end portion and is configured to be movable between an opening and closing movement start position and a completely retracted retreat position by expansion and contraction of the rod. The seal block was provided with a vacuum deaeration hole for eliminating residual air in the container, and was connected to a vacuum pump via a pipe. In a third aspect of the invention, which is mainly based on the first aspect, an internal cooling device for cooling the fixed dam block is added to the deaeration device. A cooling device for cooling the sealing member. Furthermore, the first
In the fifth aspect of the present invention, a deaeration groove is provided on the inner surface of the ring-shaped projection on the side of the extrusion stem, and the inner diameter of the deaeration groove is set outside the fixing dam block attached to the tip of the extrusion stem. According to a sixth aspect of the invention, which has a substantially circular shape larger than a diameter and is mainly based on the first aspect, a ring-shaped seal block is located inside the seal block and has the seal member; An outer seal block that is located outside the block and holds an inner seal block, the inner seal block having a first cooling medium passage surrounded by a lid and radially arranged, A second coolant passage is provided between the inner seal block and the outer seal block that holds the inner seal block, and the inner block faces the seal member. And at the same time spraying a cooling medium I,
A gas outlet that blows off extraneous matter such as dust and dirt is provided.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a billet in a container is pushed in 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 evacuated from both sides 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 deaerated from both sides or one side of the container just before pressing the tip of the billet against the die. In the present invention, since the air in the container is forcibly vacuum-evacuated on the extruding stem side of the billet before the billet is compressed by the extruding stem, the process for discharging the compressed air after the billet is compressed by the extruding stem is performed. The so-called degassing step can be omitted.

In the present invention, when air is sucked from the extrusion stem side of the container, a ring-shaped projection is disposed on the end face of the container on the extrusion stem side before the billet is compressed between the extrusion stem and the die. At the same time, a rotating base of a split seal block is disposed on the upper end surface of the container on the side of the extrusion stem, and is fixed to the leading end via a swing arm from the rotating base so that it can be opened and closed in the axial direction of the container. While sealing with the split seal block, the air in the container is vacuum-evacuated, and the ring-shaped protrusion has a diameter larger than that of the fix dam block so that the air in the container can be evacuated smoothly. When the billet is loaded into the container by the extrusion stem, the inner surface of the ring-shaped protrusion and the fixed dummy are provided. Since the resulting annular gap between the outer peripheral surface of the block, since the air between the container and the billet is easily degassed outside the container, the product yield by preventing the generation of blisters is significantly improved.

Further, a cooling medium passage is provided in the ring-shaped seal block to cool the ring-shaped seal block body while the cooling medium is circulating, and is provided inside the ring-shaped seal block toward the seal member. By opening the gas outlet that blows off foreign substances such as dust and dust at the same time as spraying the cooling medium, the cooling medium is continuously sprayed from the gas outlet toward the seal member during opening and closing of the seal ring. The life of the seal member increases due to cooling, and aluminum dust attached to the inner peripheral surface of the seal block or the outer peripheral surface of the extrusion stem by the gas blown out from the gas outlet even while closing the two seal rings, Blow-off of dust, dirt, etc., which degrades the sealing properties, can be blown off and removed, increasing the sealing properties and achieving a higher degree of vacuum degassing. The ability.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an 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 an extrusion molding apparatus provided with a suitable deaerator according to the present invention, FIG. 2 is a front view as viewed from A to A in FIG. 1, and FIG. 3 is a view from BB in FIG. FIG. 4 is a plan view as viewed from C to C in FIG. 2, FIG. 5 is a front view as viewed from D to D in FIG. 4, FIG. 6 is an enlarged cross-sectional view of a main part of the seal block,
7 is a cross-sectional view as seen from E to E in FIG. 6, FIG. 8 is an enlarged cross-sectional view of an essential part of the sealant cooling device attached to the seal block, and FIG. 9 is a view showing a contact surface between the two seal blocks. FIG. 10 is a comparative view when a sealing material is adhered, FIG. 10 is an explanatory view showing a scraped state of aluminum dust adhering to the inner peripheral surface of the container liner, FIG. 11 is a front view of a billet loader, and FIG. FIGS. 13 and 13 are enlarged cross-sectional views showing various shapes of the inner surface of the protruding portion. FIG. 14 is an explanatory view for explaining the mounting structure of the heat-insulating seal block. FIG. 15 is a cross-sectional view of an extrusion stem having an internal cooling device. 17 is a perspective view of the bayonet block, FIGS. 17 and 18 are operation views showing the state of spraying the cooling medium simultaneously with the closing operation of the seal block, and FIG. 19 is an illustration showing the state of the billet loaded in the container being pressed and extruded. FIG.

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 disposed 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, a fixed dam block 70 that can be in close contact with the inner surface of the container 1 is provided at the tip of the extrusion stem 14 that pushes the billet 13.

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. For example, as shown in FIGS. 2 and 4, the left tie rod 12 of the two tie rods 129 on the upper left and right
9, a pair of brackets 61 is mounted, and a hydraulic cylinder 62 for movement is pivotally supported at an upper portion between the brackets 61, and a clevis 62b is attached to a tip end of a piston rod 62a of the hydraulic cylinder 62 for movement. Is fixed. The clevis 62b is rotatably supported by a substantially triangular bracket 63b fixed on an inverted L-shaped bracket 63a protruding from the upper end of the reciprocating arm 63. The clevis 62b is split into two by the retraction of the piston rod 62a. The seal blocks 40L and 40R are retracted to the state shown by the two-dot chain line in FIG.

On the other hand, below the bracket 61, one end of an advance / retreat arm 63 of a split seal block is provided with a support shaft 63c.
The other end portion has an annular split seal block 40 (40) having a donut-shaped front surface at the other end.
R, 40L) are supported by a support shaft 64 so that they can be opened and closed.
Above the split seal blocks 40R, 40L, a standing seal block opening / closing hydraulic cylinder 6 is provided.
5 is a split seal block 40 via a link mechanism 66
R, 40L. The link mechanism 66 is opened and closed by the expansion and contraction of the piston rod 65a of the split seal block opening and closing hydraulic cylinder 65. That is, when the piston rod 65a is retracted (shown by a solid line in FIG. 5), the halved seal blocks 40R and 40L are opened as shown by the solid line, and when the piston rod 65a is extended (two points in FIG. 5). (Indicated by a dashed line), the halved seal blocks 40R and 40L are closed as indicated by a two-dot chain line.

The seal block 4 is provided on the side of the cylinder 65.
A first limit switch 67, a second limit switch 68, and a third limit switch 69 for detecting an opening / closing operation position between the retreat limit position (open state) and the forward limit position (closed state) of 0R and 40L are provided respectively. is there. The first limit switch 67 detects a retreat limit position (open state) of the seal blocks 40R and 40L.
The second limit switch 68 is a seal block 40R,
0L is provided to detect that it temporarily stops at a predetermined position close to the extrusion stem 14. Then, the third limit switch 69 is connected to the seal block 4
In the position where 0R and 40L are closed with respect to the extrusion stem 14, the state becomes 0N, the electromagnetic switching valve 90 for deaeration is excited, the deaeration space 31 and the vacuum tank 20 are connected, and the container 1
The air inside is evacuated.

As will be described later, an inner seal block 40A having two seal blocks 40 (40R, 40L) located inside the seal block 40 and having seal packings 41, 44 inside, and the inner seal block 40A, The inner seal block 40 is located outside the seal block 40A.
A is divided into an outer seal block 40B that holds A, and when the seal blocks 40R and 40L are closed as shown by a chain line in FIG.
A seal packing 46 (sheet-like sealing material) for preventing air from entering from the contact surfaces 40A between the 40Ls is attached to the contact surfaces between the inner seal blocks 40A.
Such a seal packing 46 is desirably a sponge-like sealing material having heat resistance and elasticity, for example, a silicone rubber sponge sheet or a fluorine rubber sponge sheet.

When the seal blocks 40R and 40L are closed, the contact surface 40 of the inner seal block 40A is closed.
The seal packings 46 adhered to each other and the protrusions 80 to be described later via the seal packings 41 provided on the inner peripheral surfaces of the seal blocks 40R and 40L, and the fixed dummy block 70 and the extrusions via the seal packings 44. The outer peripheral surface of the stem 14 is brought into close contact with each other.

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

In particular, as shown in FIG. 9, when the two-part seal blocks 40R and 40L are closed with respect to the fixed dummy block 70 and the extrusion stem 14, the outer peripheral surfaces of the fixed dummy block 70 and the extrusion stem 14 and the seal packing. 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. 9A, a sponge-like soft rubber (thickness: 3 mm) is provided on the seal packing 46 on the contact surface 40A of the two seal blocks 40R, 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 for the seal packing 41 as well. Even when the seal packing 41 is in close contact with the outer peripheral surface of the projection 80 described later, the gap S
Is prevented from occurring.

As shown by a solid line in FIG.
When R and 40L are retracted to the retreat limit, the first billet loader 111 described later can enter and exit with the billet 13 placed thereon. Seal block 4
A deaeration hole 45 is provided in a part of each of 0R and 40L, and one end of a flexible pipe 8a is connected to the deaeration hole 45, and a fixed pipe 8b is disposed at the other end via an electromagnetic switching valve 90. And is continuous with the vacuum tank 20.

As shown in FIGS. 7 and 12, 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.

Reference numeral 56 denotes a ring-shaped protrusion, and 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.

A heat insulating pressing plate 48 is provided at the outermost part of the container tire 2 and is mounted from outside by screws 54 at a pitch circle position out of phase with the bolt 52 described above. Further, a heat insulating ring 53 is fitted on the outer peripheral surface of the projection 80. Thus, the heat insulating material 47, the fitting member 51, and the
The heat-insulating holding plate 48 is overlapped with the fitting member 51.
By attaching the heat insulating ring 53 to the outer peripheral surface of the projection 80, the temperature of the outer peripheral surface of the heat insulating ring 53 is about 200 ° C. or less, and the average temperature of the container 1 is generally about 40 ° C.
The temperature is much lower than 0 ° C.

For this reason, even if the seal packing 41 frequently contacts the heat insulating ring 53 with the opening and closing of the seal block 40, the seal packing 41 is not deteriorated by the heat history, Part of the heat from the side is not transmitted to the vacuum suction device 60 by heat conduction. Further, the seal blocks 40R and 40L described above slide on the surface of the heat insulating press plate 48 disposed above the heat insulating material 47. It is arranged to be able to move back and forth between the retreat limit position and the forward limit position without moving. The material of the heat insulating material 47 is preferably, for example, a silica-based microporous structure, and the fitting member 51 is, for example, tool steel or heat-resistant steel. As the heat insulating holding plate 48 and the heat insulating ring 53, for example, a high-performance resin is suitable.

In particular, as shown in FIG. 14 (2), 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. Then, the end face of the container 2 protrudes 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 first billet loader 111a itself is moved to the extrusion stem 14 side. Must be the first
The billet loader 111a needs to be significantly modified.

Further, if the heat insulating seal block 55 is entirely covered with the heat insulating seal block 55, not only the manufacturing cost is increased, but also many bolts must be opened to attach the heat insulating seal block 55 to the end face of the container tire 1a. (1) There is a problem in strength.

In this embodiment, as shown in FIG. 14 (3), instead of simply covering the entire end face of the container 2 with the heat-insulating seal block 55, a donut-shaped concave portion 50 is provided in the container tire 1a. When the heat-insulating seal block 55 is mounted, the protrusion length of the protrusion 80 of the heat-insulating holding plate 48 may be short, and the NO may be short enough 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
The present invention is not limited to exchanging the billet liner 111c which has been modified so that the end face of the projection 11c does not interfere with the projection 80. For example, the billet loader 111 is disposed at a position where it does not interfere with the projection 80 when a new extrusion press is provided. It may be provided.

In this embodiment, when returning to the container 1 of the extrusion press for a general-purpose machine as shown in FIG.
This can be achieved by appropriately attaching the recovery block 56 as shown in FIG. 4 (4) and FIG. 14 (5) with bolts or the like (not shown).

In consideration of the case where the inside of the extrusion stem 14 is not cooled, the inner diameter Y of the projection 80 provided on the heat insulating holding plate 48 is, as shown in FIG.
a is larger than the inner diameter X (Y> X). This is because aluminum dust adheres to the enlarged diameter portion 49 of the fixed dam block 70 at the time of extrusion, and
Even if the inner diameter becomes larger than the inner diameter X of the container liner 1a, the air in the container 1 becomes easier because the annular gap between Y and X is formed in the inner diameter Y of the projection 80. Can be degassed. Conversely, when cooling water is passed through the interior of the fixed dam block 70 to a cooling pipe 191 to be described later so that the outer surface 206 becomes approximately 200 to 250 ° C. or less, the tip of the fixed dam block 70 is Even if aluminum residue adheres to the enlarged diameter portion 49 and the tip enlarged diameter portion 49 increases in diameter and becomes the same diameter as the inner diameter X of the container liner 1a immediately after extrusion, Fix Damii is not required until the next extrusion starts. The surface temperature of the enlarged-diameter portion 49 at the end of the block 70 is cooled to 200 to 250 ° C. or less, and is smaller than the inner diameter X of the container liner 1a. Has become. Further, the billet 13 is easily pushed into the container 1 from the end surface of the extrusion stem 14 of the projection 80 on the end surface of the projection 80 on the side of the extrusion stem 14. 4
9 so that it can pass through the inner diameter of the projection 80 smoothly.
It has an enlarged taper. Further, the end face of the container liner 1a on the side of the protrusion 80 is also provided with a taper having an enlarged diameter, and is connected to the inner surface of the protrusion 80 following the tapered end.

When the enlarged diameter portion 49 of the fixed dam block 70 passes through the inner diameter of the projection 80, an annular gap is formed between the enlarged diameter portion 49 of the circular tip and the inner diameter of the circular projection 80. 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, a projection 80 having a circular front is disposed at a position corresponding to the container liner 1a, and the heat insulating ring 53 fitted on the outer peripheral surface of the projection 80 is provided. 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 when the two-piece seal blocks 40R and 40L are opened and closed, there is no cover plate or guide rail, and the first seal blocks 40R and 40L remain open while the first seal blocks 40R and 40L are opened. Hydraulic cylinder 6 for movement without interfering with billet loader 111a
When the second piston rod 62a is retracted, the reciprocating arm 6
3 is tilted about the support shaft 63c and retreats.

Therefore, not only can the container tire 2 and the container liner 1a be easily exchanged, but also, as shown in FIG. 10, the extrusion stem 14 which has completed the extrusion of the billet 13 is returned to the original position before the extrusion of the billet 13. The fix dummy block 7 provided at the tip of the extrusion stem 14 when returning.
However, even if aluminum dust adhered to the inner peripheral surface of the container liner 1a is scraped off by the outer peripheral surface of the fixed dam block 70, the peeled aluminum dust simply falls down from the tip of the inner peripheral surface of the projection 80. Unlike the conventional case, the seal does not fall into the groove of the guide plate and the opening / closing of the seal blocks 40R and 40L becomes insufficient to deteriorate the sealing performance (FIG. 10B).

Next, in this embodiment, the seal packing 41,
A cooling device 91 mainly for spraying a cooling medium toward a seal member such as 44 is provided. The two seal blocks 40 (40R, 40L) are located inside the seal block 40 and the seal packing 4
An inner seal block 40A having an inner seal block 40A and an outer seal block 40 located outside the inner seal block 40A and holding the inner seal block 40A;
B and the outer seal block 40
B is attached to the inner seal block 40A by holding bolts 95 arranged at appropriate pitch intervals from the outside of B.

As shown in FIG. 7, the inner seal block 4
A semicircular concave groove is formed in OA, and a first cooling medium passage 96 is provided by mounting a lid 98. The first cooling medium passage 96 has a plurality of radially arranged slit shapes.
The tip of the seal packing 44 is appropriately cooled by a cooling medium blown out from the first gas outlet 100 opened to the side of the seal packing 44.

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 with the cooling medium blown out from the second gas outlet 101 opened to the side of the seal packing 41. . In the present embodiment, the first cooling medium passage 96 and the second cooling medium passage 97 are configured to communicate with each other. However, the present invention is not limited to this, and the first cooling medium passage 96 and the second cooling medium passage 97 communicate with each other. It may be provided independently without any.

One end of a flexible pipe 92 is connected to the outer seal block 40B, and the other end is provided with a fixed pipe 94 via an electromagnetic switching valve 93. The fixed pipe 94 is 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 without being limited to the retreat limit position where L and 40R are opened or the forward limit position where L and 40R are closed.

Next, the billet loader 111 will be described with reference to FIGS. In FIG. 2, a first billet loader 111 and a second billet loader 140 are provided. As shown in FIG. 3, the second billet loader 140 includes a telescopic cylinder 145, a moving frame 146, a linear guide 147, a holding portion 154, a billet loader swing arm 149, a tilt stopper 150, and a stopper 151 for restricting the tilt stopper from retreating. 152) and a fixed frame 153.

As shown by the broken line in FIG. 2, the second billet loader 140 receives the billet 13 transported by the billet carrier 141 at the time when the second billet loader 140 advances, and moves the first billet loader 111 at the retreat limit position. This is for transferring to the first billet loader 111 provided on the side of the container 1 by tilting to the same position as the lower limit position. That is, the billet carrier 141 has an inclined base (not shown) installed near the base surface of the molding machine, and a delivery holder 143 that bridges to the second billet loader 140 is mounted via the inclined base.

The delivery holder 143 has a V-shaped billet receiving portion, and is attached to the support shaft 144 so that the receiving portion can be turned. Then, the billet 13 can be swingably driven by a cylinder mechanism (not shown). The billet 13 is first received with the V-shaped receiving portion opening directed toward the upstream side of the inclined table, and the billet of the second billet loader 140 is turned further downstream. It is driven so as to send it to the holding unit 154. The second billet loader 140 is arranged to face the billet carrier 141 such that the billets 13 are supplied one by one to the second billet loader 140 by such a billet carrier 141.

The telescopic cylinder 1 having a telescopic rod 145a at one end of the fixed frame 153 in the axial direction.
45 is provided, and the distal end of the rod 145a is connected to a moving frame 146 via a connecting member 157. Linear guides 147 are provided on both sides of the fixed frame 153 in the longitudinal direction, and the moving frame 146 can move forward and backward along the linear guides 147.

A pair of rod-shaped movable frame stoppers 1 for restricting retraction of the movable frame mounted above one end 155 of the fixed frame 153.
Reference numeral 51 denotes a member for restricting the retreat limit of the moving frame 146. The structure is such that by rotating the adjusting screw 156, the stopper 151 for restricting the moving frame retreat is moved back and forth to determine the retreat position of the moving frame 146. On the other hand, a pair of rod-shaped tilting stopper retraction restricting stoppers 152 attached below the one end side 155 of the fixed frame 153 are located at the rear lower part of the moving frame 146 at the retreat limit position of the moving frame 146, and have adjustment screws 158. Is rotated to move the tilt stopper retraction regulating stopper 152 back and forth to determine the retreat position of the tilt stopper 150, whereby the rear end of the billet loader swing arm 149 abuts the tilt stopper 150, The billet 13 placed on the billet holding portion 154 at the tip of the billet loader swing arm 149 around the rotation support shaft 160 can be tilted and raised to the intermediate stop standby position.

Next, the first billet loader 111 will be described. The first billet loader 111 receives the billet 13 as a forming base material transported to the intermediate stop position by the second billet loader 140, and transports and supplies it to the billet loading port 126. The first billet loader 111 has a fixed frame 161 protruding toward the extrusion stem 14 of the container 1 attached thereto. The first billet loader 111 can move integrally with the container 1 on the side end surface of the container 1 as shown in FIG. The fixed No. 1 billet loader 111a and the No. 1 billet loader. It comprises a two billet loader 111b.

The first billet loader 111 is adjacent to the container 1 side and can be tilted freely. 2 billet loader 111b
And No. No. 1 that can tilt freely adjacent to the first billet loader 111b. It comprises one billet loader 111a. The first billet loader 111 is disposed to face the second billet loader 140, and is capable of turning along a plane orthogonal to the extrusion center line of the molding machine. The first swing arm 162 of the first billet loader 111a and the No. 1 2
A second swing arm (not shown) of the billet loader 111b is provided.

That is, to explain the swing arm 162 as a representative, one end is pivotally attached to a turning center 163 arranged on the upper inside of the lower tie rod 129. Further, a rising restriction stopper 164 is provided at an upper end of the fixed frame 161 and a lowering stopper 165 is disposed at a lower end of the fixed frame 161.
The lower limit of the first billet loader 111 is regulated so that the billet 13 can be easily delivered with the billet loader 111 facing the second billet loader 140.

On the other hand, when the first billet loader 111 conveys the billet 13 received from the second billet loader 140 to the billet loading port 126 via the intermediate stop standby position, the ascending restriction stopper 164 places the billet 13 on the first billet loader 111. The upper limit of the first billet loader 111 is regulated so that the billet 13 can be easily loaded into the billet loading port 126. No. 1 billet loader 1
The first swing arm 162 of 11a is connected to the piston rod 166a of the first hydraulic drive cylinder device 166,
The first swing arm 162 is driven between the lower limit position shown by the broken line in FIG. 2 and the upper limit position shown by the solid line by the expansion and contraction operation of the piston rod 166a. In addition,
Reference numeral 167 denotes a second hydraulic drive cylinder device 167,
No. The two billet loader 111b is connected to a second swing arm via a piston rod 167a.

A first billet holding portion 168 for holding the billet 13 is attached to the tip of the first swing arm 162. The first billet holding portion 168 has three pedestals 169 for supporting the lower surface of the billet 13, so that the supported billet 13 is stably held. One end of the first billet holding portion 168 attached to the tip of the first swing arm 162 has a support shaft 170.
Is provided. On the other hand, the connecting member 172 fixed at a fixed angle to the lower end of the clamp arm 171 is attached to the clamp arm 171.
Is connected to the tip of a rod of an auxiliary cylinder 173 that clamps or releases the billet 13 so that the clamp arm 171 is swung by the expansion and contraction of the rod. Therefore, in the first billet holding portion 168, the billet 13 is held at least at three points by the pedestal 169 and the clamp arm 171 to prevent the billet 13 from dropping during transfer.

Next, the structure on the side of the extrusion stem 14 is such that the fixed dummy block 70 and the extrusion stem 14 are bayonet-coupled via the bayonet block 180, and the fixed dummy block 70 and the extrusion stem 14 are connected to each other. In some cases, it is directly screwed.

In this embodiment, a structure in which the extrusion stem 14 is fixedly connected to the fixed dummy block 70 and the extrusion stem 14 will be described in detail. The fixed dam block 70 is fixed to the front surface of the extrusion stem 14 and slidably provided in the container liner 1a. The rear end of the extrusion stem 14 is fixed to a crosshead 185 via a stem holder 183 and a pressure ring 184 as shown in FIG.

A bayonet block 180 is provided on the front surface of the extrusion stem 14, and a rear half of the bayonet block 180 is provided at the tip of a connection rod 181 having a circular outer diameter section. Screwed to the screw. The rear end of the connection rod 181 is the large diameter portion 18
2 and is fixedly engaged with a tapered surface in a hole at the rear end of the extrusion stem 14.

The front half of the bayonet block 180 is of the bayonet type as shown in FIG. 15, and three projections 186 are arranged at equal intervals, for example. On the other hand, the protrusion 1
86 is engaged with the concave portion 188 which can be engaged, and is inserted. By rotating the dummy boss 187 about 60 degrees, the dummy boss 187 can be securely and quickly attached to and detached from the bayonet block 180.

A through-hole is formed in the connection rod 181 in the axial direction.
9. Drain pipe 190 is provided. The distal ends of the water supply pipe 189 and the drain pipe 190 forming the cooling pipe 191 are firmly attached to the holes 193 and 194 of the cooling pipe distal block 192 by welding, and the rear end is the pressure ring 1.
It extends to 84. An end of the water supply pipe 189 is connected to a cooling supply pump (not shown) via a pipe 195, an on-off valve 196, and a pipe 197 in a pressure ring 184.
It is connected to. The end of the drain pipe 190 is connected to the drain port 199 via a pipe passage 198 in the pressure ring 184.

The connection rod 1 is provided between the inner peripheral surface of the extrusion stem 14 and the outer peripheral surface of the connection rod 181.
In order to keep the core of 81 in a flexible state,
A slight gap is provided. Also, connection rod 1
A slight gap is provided between the inner peripheral surface of 81 and the outer peripheral surfaces of the water supply pipe 189 and the drain pipe 190 so that the connection rod 181 is not directly cooled. Also, the inner peripheral surface of the connection rod 181 and the cooling pipe tip block 19
2 is provided with a slight gap to keep the core in a flexible state.

In this case, since the connection rod 181 is provided with a through hole and passes through the water supply pipe 189 and the drain pipe 190, the connection rod 181 is not directly cooled, and therefore, the temperature difference between the extrusion stem 14 and the connection rod 181. Less, Fix Dammy Block 7
The true flexibility of 0 is not compromised. The hole 193 in the cooling pipe tip block 192 is provided so as to penetrate therethrough.
2, and communicates with the opening 200 extending in the outer peripheral direction. In the first half of Damii Boss 187, Damii Boss 1
A small cylindrical projection 203 provided at the center of the core block 202 is inserted into the central through hole 201 of the base 87, and a connection nut 204 is screwed from the rear end side of the dummy boss 187 into the screw of the small cylindrical projection 203. The core block 202 comes into strong contact with the dummy boss 187 by screwing the connection block 204 and the core block 202.

Also, on the outer periphery of the front side of the dami boss 187,
A cylindrical outer ring 205 is fixed. Between the rear end surface of the core block 202 and the front end surface of the dummy boss 187, the front end of the outer ring 205 and the core block 20
A gap corresponding to a step with the outer surface 206 of the core block 202 is provided. When the core block 202 is pushed backward during extrusion, the rear end face of the core block 202 comes into contact with the front end face of the dummy boss 187. The outer ring 205 is spread to hit the inner surface of the container, and prevents the billet 13 from flowing toward the extrusion stem 14 of the fixed dam block 70.

Core block 202, outer ring 205
The dummy boss 187 and the like that together form the fixed damage block 70. Therefore, the outer peripheral surface on the front end side of the outer ring 205 has a size substantially in contact with the outer peripheral surface of the container 1. Also, core block 2
02 has a tapered surface portion 207 diverging forward on the outer peripheral portion of the front end.
So that the outer ring 205 can be in close contact with the tapered surface of the inner peripheral portion at the front end. The water supply pipe 18 is provided at the central axis of the core block 202 and the projection 203.
9 is provided with a passage 208 through which water is supplied and cooling water flows, and a front end of the passage 208 extends to near the outer peripheral surface 206 of the core block 202.

A plurality of radiant cooling holes 209 (eight in this embodiment) radially extending from the tip of the passage 208 to the outer ring 205 are provided. In the vicinity of the outer periphery from the outer peripheral end of the radiation cooling hole 209 to the dummy boss 187 and the core block 202, a passage 2 is formed in the axial direction.
10 are provided and connected to the opening 200 of the cooling pipe 191. Here, reference numerals 211, 212, and 213 indicate plugs, 215, 216, and 217 indicate heat-resistant O-rings, respectively.

Next, the operation of the above device will be described.

First, before the extrusion of the billet 13 is started, a cooling medium supply device (not shown) is operated to
A cooling medium such as cooling water is introduced into 9 to cool the fixed dam block 70 from the inside. At this time, the cooling water enters from the rear of the extrusion stem 14 and
Through the water supply pipe 189 in the connection rod 181, the passage 208, the radial cooling holes 209, the passage 210, and the opening 200, and the water is discharged from the rear of the extrusion stem 14 through the drain pipe 190. In the present invention,
The radial cooling holes 209 are formed on the outer surface 20 of the core block 202.
6, the temperature of the outer surface 206 of the fixed dammy block 70 at the time of upset is set to about 200 to 250 ° C. by flowing cooling water.
Can cool down.

Therefore, when the enlarged-diameter portion 49 at the tip end of the fixed dam block 70 during extrusion is suppressed from expanding and evacuated from the extrusion stem 14 side, usually, the inner peripheral surface of the container 1 and the fixed dummy block 70 are removed. Since a gap is held between the outer diameter of the front end enlarged diameter portion 49 and the outside, the air remaining in the deaeration space 31 in the container 1 can be sufficiently deaerated.

When the fixed dam block 70 is cooled to a desired temperature, the split seal blocks 40R and 40L are retracted by extension of the piston rod 65a of the moving hydraulic cylinder 65 as shown in FIGS. (The position shown by the solid line in FIG. 2) moves from the forward limit (the position shown by the two-dot chain line in FIG. 2). The state at this time will be described. FIG. 17 (1) shows one seal block 40R of the opened seal block 40 as a representative,
The cooling gas medium is constantly blown out from both the first gas outlet 100 and the second gas outlet 101 provided in the inner seal block 40A toward the seal packing 44 and the seal packing 41, respectively, so that the seal block 40 is closed. When the seal gasket 44 and the seal gasket 41 abut against the outer circumference of the fixed dummy block 70 and the outer circumference of the heat insulating ring 53, heat transferred from the container 1 by heat conduction is applied to the seal gasket 44 and the seal gasket 41. This prevents the seal packing 44 and the seal packing 41 from shortening the replacement time due to the heat history.

When pressurized oil is supplied to the cylinder 65 from this state, the seal block is blown from both the first gas outlet 100 and the second gas outlet 101 toward the seal packing 44 and the seal packing 41 while blowing the cooling gas medium. Move forward 40R and 40L. Seal block 40R
As the (40L) advances in the direction approaching from the direction away from the extrusion stem 14 and the fixed dam block 70, the first gas outlet 100 and the second gas outlet 1
Adiabatic holding plate 4 by cooling gas medium blown from
This cools the outer peripheral surface of the heat insulating ring 8 and the heat insulating ring 53 and blows off the adhered dust and dirt (FIG. 17 (2)).

When the seal block 40R (40L) comes closer to the extrusion stem 14 and the fixed dummy 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 the cooling medium 01, the outer peripheral surfaces of the heat insulating holding plate 48 and the heat insulating ring 53 are cooled and the attached dust and dust are blown off more and more (FIG. 18).
(1)).

After the seal block 40R (40L) comes into contact with the fixed dummy block 70 and the heat insulating ring 53, the first gas outlet 100 and the second gas outlet 10
The cooling gas medium is blown out from 1, and the blown out 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 figure. Only (FIG. 18 (2)).

Next, a state where the billet 13 is crushed will be described with reference to FIG. First, pressurized oil is supplied to the rod side of the container cylinder 33, the piston 37 is moved to the left, and the container 1 that is separated from the die 3 is moved forward to bring the die 3 into contact with the container 1. Next, the first swing arm 162 is raised by retracting the piston rods 166a and 167a of the first hydraulic drive cylinder device 166 and the second hydraulic drive cylinder device 167 of the first billet loader 111, respectively, and the first billet holder 168 and the second billet holder (not shown)
3 is held so that the billet can be loaded into the billet loading port 126 while being held.

The split seal blocks 40R and 40L are in the retreat limit as shown by the solid line in FIG. 5, and from this state, hydraulic pressure is supplied to the split seal block opening / closing hydraulic cylinder 65 to extend the piston rod 65a. . The first limit switch 67 is stopped at the retreat limit position while being kicked, and from this state, the billet 13 is lifted with the billet 13 placed on the billet loader 111, and the extruding stem 14 starts moving forward at a constant speed. Split seal block 4
0R and 40L are started to advance (FIG. 19 (1)), and the second limit switch 68 is kicked at a predetermined position close to the pushing stem 14 in the radial direction and temporarily stopped. On the other hand, the tip of the billet 13 is gradually pushed into the container 1 by the advance of the extrusion stem 14. In the middle, No. 1 billet loader 111a and no. 2 billet loader 1
11b descends to a position where it does not interfere with the halved seal blocks 40R and 40L (FIG. 19 (2)). At this time,
The extrusion stem 14 continues to advance, and when it reaches a predetermined position by a rotary encoder (not shown), the advance speed is reduced.

When the forward moving speed of the extrusion stem 14 is reduced, a solenoid valve (not shown) disposed on the hydraulic oil introducing pipe of the split seal block opening / closing hydraulic cylinder 65 is excited, and the split seal blocks 40R and 40L are excited. Re-moves at the speed described above, and finally stops at the forward limit position. At this time, the extrusion stem 14 has pushed the billet 13 by a predetermined length shown in FIG. At this time, as described above, the outer surface of the fixed dummy block 70 is already approximately 200 mm.
When the upset is started in this state, the rear end of the billet 13 which is in contact with the fixed dam block 70 is cooled. When the upset is started, the outer peripheral end of the billet 13 on the extrusion stem 14 side rises and comes into close contact with the inner peripheral surface of the container 1.

When performing the above upset, billet 1
The rear end of the fixed damper block 70 is cooled and the fluidity is considerably deteriorated.
6, the degree of friction between the billet 13 and the rear end of the billet 13 is prevented from getting caught in the outer skin. In this manner, the cooling of the fixed dam block 70 prevents the rear end outer surface skin of the billet 13 from being caught in the inside of the air and prevents the air remaining in the degassing space 31 from being degassed by vacuuming the surface of the billet 13. By degassing, air that causes blisters can be sufficiently removed.

Next, the two-piece seal block 40R,
When 0L is closed with respect to the fixed dam block 70 and the heat insulating ring 51, the third limit switch 69 is kicked to activate the vacuum suction device 60, and at the same time, the electromagnetic switching valve 90 is excited, so that the container 1 and the die 3 Vacuum suction is performed in a state where the deaeration space 31 between the billets 13 and the vacuum suction device 60 are connected (FIG. 19 (3)).

The sealed air in the deaeration space 31 passes through a deaeration hole 45 provided in a part of the halved 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.

In this state, when the electromagnetic switching valve 90 is excited, 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
When the front end of the billet 13 hits the die 3, the pressure oil in the side cylinder reaches a predetermined pressure and the upsetting is completed by switching to the main cylinder (not shown) (FIG. 19 (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 returns to the original retreat limit position. Thereafter, the extrusion by the extrusion stem 14 is performed, and the extrusion is completed.

During the operation of extruding the billet 13 from the die 3 to obtain an extruded product, the first billet holding portion 168 of the first billet loader 111 is lowered to the lower limit position, and the second billet loader 140 is As shown in FIG. 2, the rod 145 a of the telescopic cylinder 145 is extended, the billet holder 154 is horizontally moved to the forward limit, and is opposed to the billet carrier 141. Then, the delivery holder 143 of the billet carrier 141 is rotated, and the billet 13 enters the billet holding portion 154. In this state, the rod 145a of the telescopic cylinder 145 is retracted to the retreat limit. Next, the first billet holding unit 168 is moved from the lower limit position to the intermediate stop standby position.

When the container 1 comes into contact with the die 3, the second billet loader 140 is moved until the holding portion 154 at the tip of the swing arm 149 is located at the lower limit position of the first billet loader 111 as shown in FIG. Tilt and stand. Then, the billet 13 is moved to the second billet loader 14.
From 0, it is delivered to the first billet loader 111.

[0090]

As is apparent from the above description, in the present invention, the two seal blocks disposed on the extruding stem side end surface of the container are moved forward and backward from the vicinity of the tie rod to the vicinity of the center of the extrusion by a swing method. After that, by closing with another opening / closing cylinder, when the container liner is replaced, the two seal blocks can be sufficiently retracted to a position where they do not interfere with each other, thereby improving workability. In addition, since the seal is sufficient, the degree of vacuum is high, and degassing can be sufficiently performed, blister generation can be prevented, and the product yield is greatly improved. By providing a substantially annular deaeration groove on the inner side of the ring-shaped protrusion on the extrusion stem side, aluminum residue adheres to the enlarged diameter portion at the tip of the fixed dam block, which increases the diameter of the enlarged diameter portion. Even if the air in the container can be degassed, the extruded profile without blister can be extruded stably, and the yield of the extruded profile of the product can be easily improved greatly. . The idle time is short because the sealing time of the two seal blocks is short. When the two seal blocks are closed, they are separated until immediately before they come into contact with the ring-shaped projection and the extrusion stem 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 there is no need to perform a burp cycle as in the related art, the idle time can be reduced. By forming a donut-shaped groove on the end surface of the container on the extrusion stem side and mounting a heat-insulating seal block using a heat-insulating material to the minimum necessary, heat transfer from the container side can be prevented, and Since the heat-insulating seal block is mounted only on a part of the end face of the container on the side of the extrusion stem, the number of bolt mounting holes drilled on the end face of the container can be reduced, so that the mechanical strength does not decrease. By cooling the outer surface of the fixed dam block to a desired temperature, the outer end face side of the billet opposed thereto is cooled, the flow of the outer peripheral surface of the billet metal is regulated, and the occurrence of defects such as blisters is prevented.

[Brief description of the drawings]

FIG. 1 is a system diagram of an extrusion molding apparatus provided with a suitable deaerator according to the present invention.

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

FIG. 3 is a plan view as viewed from BB in FIG. 2;

FIG. 4 is a plan view as viewed from C to C in FIG. 2;

FIG. 5 is a front view as viewed from DD in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part of the seal block.

FIG. 7 is a sectional view as seen from E to E in FIG. 6;

FIG. 8 is an enlarged cross-sectional view of an essential part of the sealant cooling device attached to the seal block.

FIG. 9 is a comparative diagram in a case where a sealing material is adhered to a contact surface between the split seal blocks.

FIG. 10 is an explanatory view showing a scraping state of aluminum residue adhering to the inner peripheral surface of the container liner.

FIG. 11 is a front view of a billet loader.

FIG. 12 is an enlarged sectional view of a protrusion.

FIG. 13 is an enlarged sectional view showing various shapes of an inner surface of a protrusion.

FIG. 14 is an explanatory diagram illustrating a mounting structure of a heat-insulating seal block.

FIG. 15 is a sectional view of an extrusion stem having an internal cooling device.

FIG. 16 is a perspective view of a bayonet block.

FIG. 17 is an operation diagram showing a state in which the cooling medium is sprayed at the same time as the closing operation of the seal block.

FIG. 18 is an operation diagram showing a continuation of the operation shown in FIG. 17;

FIG. 19 is an explanatory diagram showing a state in which a billet loaded in a container is extruded under pressure.

[Explanation of symbols]

 DESCRIPTION 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 43 Cylinder 43a Piston rod 43b Clevis 44 Connection member 45 Deaeration hole 47 Insulation material 48 Insulation holding plate 50 Depression 51 Fitting member 53 Insulation ring 55 Insulation seal block 56 Recovery block 60 Vacuum suction device 61 Bracket 62 Move Hydraulic cylinder 63 Reciprocating arm 64 Support shaft 65 Split seal block opening / closing hydraulic cylinder 66 Link mechanism 67 First limit switch 68 Second limit switch Reference Signs List 9 third limit switch 70 fixed dam block 80 projection 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 medium passage 98 lid 100 first gas outlet 101 first gas outlet 111 first billet loader 111a No. 1 billet loader 111b No. 2 billet loader 126 billet loading port 128 swing arm 129 lower tie rod 130 pivot center shaft 132 hydraulic drive cylinder device 133 billet holding unit 134 pedestal 140 second billet loader 141 billet carrier 145 telescopic cylinder 146 moving frame 147 linear guide 148 holding unit 149 billet Loader swing arm 150 Tilt stopper 151 (152) Retraction control stopper 153 Fixed frame 154 Billet holding part 155 One end side of fixed frame 156, 158 Adjustment screw 157 Connection member 160 Rotating support shaft 161 Fixed frame 162 First swing arm 163 Center of rotation 164 Ascent stop 165 Ascent stop 166 First hydraulic drive cylinder device 167 Second hydraulic drive cylinder device 168 First billet Holding part 169 Pedestal 171 Clamp arm 172 Connecting material 173 Auxiliary cylinder 180 Bayonet block 181 Connection rod 182 Large diameter part 183 Stem holder 185 Cross head 186 Projection part 187 Damii boss 189 Water supply pipe 190 Drain pipe 191 Cooling pipe 192 Cooling pipe opening and closing block 196 Valve 199 Drain port 200 Opening 201 Central through hole 202 Core block 205 Outer ring 206 Outer surface 207 Tapered surface 209 Radial cooling hole

Continuation of the front page (56) References JP-A-8-243633 (JP, A) JP-A-7-314032 (JP, A) JP-A-6-313214 (JP, A) JP-A-3-413 (JP) JP-A-9-57335 (JP, A) JP-A-9-94608 (JP, A) JP-A-9-76010 (JP, A) JP-B-52-9189 (JP, B2) JP-B-A 54-30989 (JP, B2) Jikken 55-19605 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 23/00-35/06

Claims (6)

(57) [Claims] 1. A ring-shaped projection provided on an end surface of a container having a container liner into which a billet is loaded, on an extrusion stem side, and openable and closable at an upper portion of the extrusion stem on the container side in a direction intersecting with the axial direction of the extrusion stem. A pair of split ring-shaped seal block rotating bases, a split ring-shaped seal block having one end of a swing arm fixed to the turning base and fixed to the other end, and closing the seal block. The seal block which can be simultaneously brought into close contact with the outer peripheral surface of the ring-shaped protrusion and the outer peripheral surface of the fixed dummy block or the extrusion stem via a seal member attached to the seal block contact surface side. Is attached to the tip of a rod engaged with a hydraulic cylinder pivotally supported on a tie rod via a bracket. An extrusion molding apparatus characterized in that said two seal blocks can be moved between an opening / closing movement start position and a completely retracted retreat position. 2. An extrusion molding apparatus, wherein the seal block according to claim 1 is provided with a vacuum deaeration hole for eliminating residual air in the container, and is connected to a vacuum pump via a pipe. 3. An extruder according to claim 1, further comprising an internal cooling device for cooling said fixed dam block. 4. An extrusion molding apparatus, wherein a cooling device for cooling the seal member is provided in the seal block according to claim 1. 5. A deaeration groove is provided on the inner surface of the ring-shaped projection according to claim 1 on the side of the extrusion stem, and the inner diameter of the deaeration groove is set to be smaller than the outer diameter of the fix damey block attached to the tip of the extrusion stem. An extrusion molding apparatus characterized in that the extrusion molding apparatus has a large substantially circular shape. 6. The ring-shaped seal block according to claim 1, wherein the inner seal block has the seal member positioned inside the seal block, and the inner seal block is positioned outside the inner seal block to hold the inner seal block. The inner seal block has a first cooling medium passage surrounded by a lid and arranged radially, and the outer seal block holds the inner seal block. At the same time as providing a second cooling medium passage between the inner block and blowing the cooling medium toward the seal member to the inner block,
An extrusion molding apparatus characterized by having a gas outlet for blowing off deposits such as dust and dirt.