JP3159080B2 - Extrusion molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for extruding an aluminum alloy or the like by means of an extrusion press, after closing a fixed dummy block or an extruding stem with a two-part seal block and before extruding a billet. The present invention relates to an improved extruder for degassing the air between billets to the outside of a container and extruding the billets effectively without waste.

[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. 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.

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 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 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 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 be performed.

[0019]

In order to achieve the above object, according to the present invention, there is provided a ring-shaped projection provided on an extrusion stem side end surface of a container having a container liner in which a billet is loaded, and A side seal face of the ring-shaped protrusion and a push stem are provided via a seal block which is provided so as to be openable and closable in a direction crossing the axial direction, and a seal member attached to the seal block when the seal block is closed. A pressing means for pressing the seal member against the side end face of the ring-shaped projection is provided on the seal block so as to be able to be pressed and moved in the pushing direction so that the seal member can be simultaneously brought into close contact with the outer peripheral surface.

[0020]

When the billet in the container is pushed by the extrusion stem behind the billet and the billet is pressed against the 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.

In the present invention, when air is sucked from the extrusion stem side of the container, a ring having an inner diameter larger than the inner surface of the container is formed on the end face of the container on the extrusion stem side before the billet is compressed between the extrusion stem and the die. The air in the container is vacuum-sucked in a state in which the pressing means for pressing the side end surface of the ring-shaped protrusion by pressing the pressing means pressing the side end face of the ring-shaped protrusion in the pushing direction is slidably provided. The ring-shaped projection is provided with a substantially circular deaeration groove having a diameter larger than that of the fix dam block so that the air in the container can be smoothly deaerated. When a billet is loaded into a container, an annular gap is created between the inner surface of the ring-shaped protrusion and the outer surface of the fixed dummy block. Since the air between the Na and the billet is easily degassed outside the container, product yield is significantly improved by preventing generation of blisters.

[0022]

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 a preferred apparatus according to the present invention,
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 a plan view of a container provided with a seal block, and FIG. FIG. 6 is a comparative view in which a sealing material is stuck on the contact surface between the two seal blocks, and FIG. 7 is an explanatory view showing a scraping state of aluminum particles attached to the inner peripheral surface of the container liner. 8
9 is a front view of the billet loader, FIG. 9 is a cross-sectional view as viewed from BB in FIG. 2, FIG. 9 is an enlarged cross-sectional view of the protrusion, FIG. 10 is a cross-sectional view as viewed from CC in FIG. 5 is a cross-sectional view as viewed from D to D in FIG. 5, FIG. 12 is an explanatory diagram of pressing the seal packing against the protrusion side end surface by pressing means, FIG. 13 is an enlarged cross-sectional view of the protrusion, and FIG. FIG. 15 is an explanatory view for explaining a mounting structure of a heat insulating seal block, and FIG. 16 is an explanatory view for showing a billet loaded in a container under a pressure extruded state.

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 side of the extrusion stem 14, a seal block 40 having a front outer peripheral portion having a substantially octagonal shape and an opening having substantially the same diameter as the extrusion stem 14 in the center portion is divided into two parts. Block (40R,
The rear part of the cylinder 43 (43R, 43R)
L) and fixed to the distal ends of piston rods 43Ra, 43La provided to be movable back and forth.

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 desirably made of, for example, a sponge-like sealing 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
The seal packings 46 adhered to each other and the end faces of the protrusions 80 to be described later via the seal packings 41 provided on the end faces of the seal blocks 40R and 40L on the container 1 side, and the fixed dummy blocks via the seal packings 44. 70 or the outer peripheral surface of the extrusion stem 14, respectively.

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 silicon 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. The seal packings 41 and 4
4 is not arranged only one, but as shown in FIG. 10, they are arranged separately and double so as to prevent air from entering from outside during vacuum degassing. Without limiting to this, triple or more degassing is performed thoroughly.

In particular, as shown in FIG. 6, when the two-part seal blocks 40R and 40L are closed with respect to the fixed dummy block 70 or the extrusion stem 14, the outer peripheral surfaces of the fixed dummy block 70 and the extrusion stem 14 and the seal packing. Due to the friction between the seals 44, the seal packing 44
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.

For this reason, as shown in FIG. 6A, 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.

Next, the structure of the opening / closing device 140 will be described. The opening / closing device 140 includes the seal block 40 (40
R, 40L), a base 142 (142R, 142L), pressing means 144, and an engagement pin 158. The base has a substantially octagonal shape, and is divided into two parts so that the base 142 (142R, 142L) can be freely contacted and separated, and the seal block 40 (40R, 40R,
40L) are superposed.

The base 142 (142R, 142L) is fixed to the upper guide legs 62 (62R, 62L) and the lower guide legs 63 (63R, 63L). As shown in FIG. 2, the base 142 has a left-right symmetrical configuration divided into two, and pressing cylinders 148 are mounted on the upper and lower sides of the left and right bases 142R and 142L, respectively. As shown in FIG. 9, the cylinder rod 14 of the pressing cylinder 148
A pressing means 144 is screwed to the tip end of 9. The pressing means 144 includes a base block 144a, a small-diameter portion 144b.
And a pressing portion 144c.

The base block 144a and the pressing portion 144c are connected by a small-diameter portion 144b and are integrally formed. On the other hand, a notch-shaped through hole 150 is provided on the end face side of the container 1 of the seal block 40 having an L-shaped cross section.
The notch-shaped through-hole 150 has a small-diameter portion 144b having a diameter smaller than the diameter of the through-hole so that the seal block 40 can be inserted into and removed from the side of the notch 42 in a short period of time.
Can be engaged. As shown in FIG. 12, the base block 144a constituting the pressing means 144 provided on each base 142 by the air oil supplied to and discharged from the pressing cylinder 148.
By applying a pressing force F in the product pushing direction to press the seal packing 41 against the end face of the projection 80, high sealing performance can be maintained.

When the pressing means 144 is moved back and forth in the extrusion direction, as shown in FIG.
A guide liner 154 extending in the extrusion direction is provided so that forward and backward movement between the seal block 40 and the seal block 40 can move smoothly. Further, as shown in FIG. 9, between the base 142 and the upper and lower pressing means 144, similarly to the guide liner 154,
A guide liner 154 is provided so that the seal block 40 can smoothly move back and forth with respect to the base 142 in the pushing direction.

Further, as shown in FIG. 5, a protruding piece 156 is provided on the left side of the center of the seal block 40.
For this reason, when the seal block 40 is mounted on the base 142, the mounting state is changed to the subsequent pressing cylinder 148.
The pins 158 are connected to each other so that no mutual displacement occurs when the pressing means 144 is moved back and forth by the pressing means 144. A locking plate 160 is fixed to the rear of the pin 158 in a direction orthogonal to the axis of the pin 158. After the base 142 and the seal block 40 are disposed in an overlapping manner, the pin 158 is inserted and turned 90 degrees. The locking plate 160 is easily locked to the locking portion 162.

As shown in FIG. 11, when the billet 13 is loaded into the container 1, the rear end face of the seal block 40 is used to remove air remaining in the space generated between the billet 13 and the container liner 1a. Coupler 164
Is provided, and the flexible pipe 8a is easily detachable here. Reference numeral 166 denotes a blind plug provided in the middle of the deaeration hole 45.

As 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 part of each of the seal blocks 40R and 40L is provided with a degassing hole 45, and a flexible pipe 8a is formed 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. 9 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 press 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. Thus, the heat insulating seal block 5
5, a heat insulating material 47, a fitting member 51, and a heat insulating holding plate 4
8, the temperature of the outer peripheral surface of the end face of the projection 80 is about 250 ° C. or less, which is considerably lower than the average temperature of the container 1 which is generally about 400 ° C. ing.

Therefore, even if the seal packing 41 at the time of closing by the repeated opening and closing of the split seal block 40 frequently contacts the end face of the projection 80, the seal packing 41 is prevented from being deteriorated by the heat history. A part of the heat from the container 1 is not transmitted to the vacuum suction device 60 by heat conduction. Further, the above-described seal blocks 40R and 40L are provided with a heat insulating holding plate 48 provided above the heat insulating material 47. It is provided so as to be able to move back and forth between the retreat limit position and the forward limit position without sliding on the surface.
As the material of the heat insulating material 47, for example, a silica-based microporous structure is preferable, and as the heat insulating seal block 55, for example, tool steel or heat resistant steel is used. And
As the heat insulating holding plate 48, for example, a high-functional resin is suitable.

In particular, as shown in FIG. 15 (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 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 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. 15 (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 heat-insulating holding plate 48 constituting the heat-insulating seal block 55. . 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 for a general-purpose machine as shown in FIG.
This can be achieved by appropriately attaching the recovery block 57 as shown in FIG. 5 (5) with bolts or the like (not shown).

The inner diameter Y of the projection 80 provided on the heat insulating holding plate 48 is larger than the inner diameter X of the container liner 1a as shown in FIG. 13 (Y> X).
This is because the aluminum cake adheres to the enlarged diameter portion 49 of the fixed dam block 70 at the time of extrusion and the enlarged diameter portion 4
9, the inner diameter of the container liner 1a becomes the same as the inner diameter X of the container liner 1a.
Since the annular gap between them is formed, the air in the container 1 can be easily deaerated.

Further, when the billet 13 is pushed into the container 1 by the pushing stem 14, the pushing can be easily carried out. While the billet 13 is easily pushed into the container 1 from the end face of the extrusion stem 14 of the portion 80, the billet 13 is enlarged so that the tip enlarged portion 49 of the fixed dam block 70 of the extrusion stem 14 can pass through the inner diameter of the projection 80 smoothly. It has a tapered diameter. 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.
It is designed to be connected to the inside.

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, the projection 80 having a circular front face is disposed at a position corresponding to the container liner 1a, and seal blocks 40R and 40L are attached to the end face of the projection 80. When pressed, it is sealed via the seal packing 41. Reference numeral 20 denotes a vacuum tank, 21 denotes a vacuum pump, 22
Is a motor.

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

For this reason, not only can the container tire 2 and the container liner 1a be easily exchanged, but also, as shown in FIG.
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 aluminum dust adhering to the inner peripheral surface of the container liner 1a is scraped off by the outer peripheral surface of the fix dummy block 70, the peeled aluminum dust only falls down from the tip of the inner peripheral surface of the projection 80, The seal block 4 falls into the groove of the guide plate as in the related art.
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.

The billet 13 is supplied one by one to the lower part of the container 1 by a billet carrier (not shown), and the billet loader 111 is configured to hold the billet and transfer it 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 expansion and contraction operation.

Here, a billet holding portion 133 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 of the extruding stem 14 side is the same as the case where the fix dummy block 70 and the extruding stem 14 are bayonet-connected via the bayonet block 72, or the case where the fix dammy block 70 and the extrusion stem 14 are directly connected. , May be screwed together.

In this embodiment, the fixed dummy block 7
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 dam block 70 is fixedly provided on the front surface of the extrusion stem 14 and has a container liner 1a.
It is slidably provided inside.

The rear end of the extrusion stem 14 is fixed to a 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 extrusion stem 14, and a rear end portion inside the bayonet block 72 is provided at the tip of a connection rod 76 having a circular outer diameter section. Screwed to 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 above device will be described.

FIG. 15 shows the state of being crushed. FIG.
As shown in FIG. 5, first, pressure oil is supplied to the rod side of the container cylinder 33, and the piston 37 is moved leftward.
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, billet 1
When the billet loader 111 is lifted and the extrusion stem 14 is advanced (FIG. 16 (1)) in a state where the tray 3 is placed, the billet 13 is pushed into the container 1 (FIG. 16 (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 two-piece seal block 40, and then the air oil is introduced into the four pressing cylinders 148, the pressing means 144 is synchronized, and the sealing block 40 is fitted. When the sealing gasket 41 is pressed against the end face side of the projection 80 which once forms the part of the member 51, the seal packing 41 is strongly pressed against the end face side of the projection 80, and at the same time, the seal packing 44 is brought into contact with the extrusion stem 14, and While sealing between the container 1
The vacuum suction device 60 is activated, the electromagnetic switching valve 90 is excited, and vacuum suction is performed in a state where the inside of the container 1 and the vacuum tank 20 can be ventilated (FIG. 16 (3)).

The sealed air on the side of the extrusion stem 14 passes through a deaeration hole 45 provided in a part of the halved seal block 40, and from the electromagnetic switching valve 90 on the pipe 8a to the vacuum tank 20 via the pipe 8b. It 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 has already been
Is in a vacuum state of, for example, 0 to 5 Torr. First,
As the extrusion stem 14 advances, the billet 13 becomes the container 1
However, at the time of the pushing, the enlarged diameter portion 49 of the fixed dam block 70 passes through the seal block 40 and closes the seal block 40.

When the electromagnetic switching valve 90 is excited in this state, the residual air in the container 1 becomes 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 pressure oil in the side cylinder reaches a predetermined pressure when the tip of the billet 13 hits the die 3, the upsetting is completed by switching to the main cylinder (not shown) (FIG. 15 (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,
Next, air oil is introduced into the pressing cylinder 148 to retreat the pressing means. Continue with the seal block 40 (40R, 40
L) is released, and immediately returns to the original retreat limit position. Thereafter, extrusion by the extrusion stem 14 is performed,
When the extrusion is completed, the extrusion stem 14 is retracted and the next molding cycle is started.

[0077]

As is apparent from the above description, according to the present invention, the two seal blocks disposed on the end face of the extruding stem of the container are closed in the direction intersecting with the axial direction of the extruding stem, and the container is closed. By pressing the pressing means more strongly against the end face of the projection, the sealing is sufficient and the degree of vacuum is high, and sufficient degassing can be performed, and the entire length of the extrusion press device does not become long. 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 from each other just before contacting the end surface of the ring-shaped projection and the outer peripheral portion of the extrusion stem, 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. 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 the 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 a plan view of a container provided with a seal block.

FIG. 5 is an enlarged front view of a main part of the seal block.

FIG. 6 is a comparison diagram in a case where a sealing material is attached to a contact surface between two seal blocks.

FIG. 7 is an explanatory view showing a scraping state of aluminum residue adhering to the inner peripheral surface of the container liner.

FIG. 8 is a front view of a billet loader.

FIG. 9 is a cross-sectional view as viewed from BB in FIG. 2;

FIG. 10 is a cross-sectional view as viewed from C to C in FIG. 5;

FIG. 11 is a cross-sectional view as viewed from DD in FIG. 5;

FIG. 12 is an explanatory diagram of pressing a seal packing against a protrusion-side end surface by a pressing means.

FIG. 13 is an enlarged sectional view of a projection.

FIG. 14 is an enlarged cross-sectional view showing various shapes of the inner surface of the protrusion.

FIG. 15 is an explanatory diagram illustrating a mounting structure of a heat-insulating seal block.

FIG. 16 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 41, 44, 46 Seal packing 42 Guide plate 45 Deaeration hole 47 heat insulating material 48 heat insulating holding plate 50 concave portion 51 fitting member 55 heat insulating seal block 57 recovery block 60 vacuum suction device 70 fixed dam block 80 protrusion 90 electromagnetic switching valve 111 (111a, 111b) billet loader 126 billet loading port 128 Swing arm 129 Lower tie rod 130 Revolving center shaft 132 Hydraulic drive cylinder device 133 Billet holding part 134 Pedestal 140 Opening / closing device 142 Base 144 Pressing means 144a Base block 1 4b small-diameter portion 144c pressing portion 146 engages pin 148 presses cylinder 150 through hole 154 guides the liner 160 retaining plate 162 locking portion 164 Coupler

────────────────────────────────────────────────── ─── 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-3-3 413 (JP, A) JP-A-7-178446 (JP, A) JP-A-59-206116 (JP, A) JP-A-9-94608 (JP, A) JP-A 9-76010 (JP, A) Japanese Patent Publication No. 54-30989 (JP, B2) Japanese Utility Model Publication No. 55-19605 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 23/00-35/06

Claims (1)

(57) [Claims] 1. A ring-shaped projection provided on an end face of an extrusion stem side of a container having a container liner into which a billet is loaded, and a split seal provided to be openable and closable in a direction intersecting with an axial direction of the extrusion stem. A block and a seal member attached to the seal block when the seal block is closed, so that the side end surface of the ring-shaped projection and the outer peripheral surface of the extrusion stem can be simultaneously brought into close contact with each other; A pressing means for pressing the pressing member against a side end surface of the ring-shaped protrusion portion is disposed so as to be capable of pressing and moving in a pushing direction.