JP3336879B2 - Degassing control method in an extrusion press using degassing means - 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. This is a method for controlling deaeration in an extrusion press apparatus using improved deaeration means for deaeration of air between billets to the outside of a container and effective and efficient extrusion of billets without containing air.

[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.

[0007] Such a two-part seal block opens and closes along a guide plate fixed to the upper and lower parts of the container end face on the extrusion stem side, and further seals 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 degassing groove 12 is provided on the inner surface of the container 1 on the extrusion stem 3 side. 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.

[0017] Further, when the extrusion stem that has completed the billet extrusion returns to the original position before the billet extrusion, the aluminum residue attached to the inner peripheral surface of the container liner is fixed by the fix dummy block provided at the tip of the extrusion stem. Since the aluminum powder scraps off the outer peripheral surface of the dummy block and falls into the groove of the guide plate, 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. An extrusion press using deaeration means for providing an extrusion cycle that does not require the degassing step called a burp cycle before extruding a billet from a die and performing high-vacuum deaeration extrusion. An object of the present invention is to provide a method for controlling deaeration in an apparatus.

[0019]

In order to achieve the above object, according to the present invention, there is provided a ring-shaped projection provided on an end face of an extrusion stem side of a container having a container liner in which a billet is loaded; A two-part seal block provided to be openable and closable in a direction intersecting with the axial direction, and attached to a contact surface of the seal block when the seal block is closed
Seal member and container side end face of the seal block
And a sealing member provided in the seal block.
The side end surface of the ring-shaped protrusion and the outer peripheral surface of the extrusion stem can be simultaneously brought into close contact with each other through a seal member provided on the end surface on the side of the stem. Using a degassing means arranged so that a pressing device for pressing can be moved in the pushing direction in a pushing direction, the billet loaded in the container is pushed forward by pushing the pushing stem, and the container liner and the billet and the billet until the upset is completed. A degassing means characterized in that air staying in the space formed between the extrusion stems is degassed and extruded according to a time set before the start of extrusion.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a deaeration control method in an extrusion press using a deaeration means 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. Enlarged sectional view showing the shape, FIG. 15 is an explanatory view for explaining the mounting structure of the heat-insulating seal block, FIG. 16 is a flowchart showing a control procedure over time,
FIG. 17 is an explanatory diagram showing a state in which the billet loaded in the container is extruded under pressure.

As shown in FIG. 1, a container cylinder 33 for sliding a container 1 composed of a container liner 1a, a container tire 2 and a connate holder 1c is provided 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 1 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. 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. Also, two seal blocks 40R, 40
A pair of upper guide legs 62 (62R, 62L) are opposed to each other in the upper portion of each L near the contact surface 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. 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 surfaces 4 of the seal blocks 40R and 40L are closed.
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 are sealed with 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.

Therefore, 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 switching 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 device 144 is screwed to the distal end of 9. The pressing device 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 to form an integral molding. 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, a base block 144 constituting a pressing device 144 disposed on each base 142 by air pressure supplied to and discharged from the pressing cylinder 148.
a is applied in the product pushing direction to apply a pressing force F to press the seal packing 41 disposed on the end face side of the container 1 of the seal block 40 against the end face of the projection 80, so that high sealing performance can be maintained. ing.

When the pressing device 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 vertical pressing device 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 so that no mutual displacement occurs when the pressing device 144 is moved back and forth due to the pressure. 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 removed to remove air remaining in the space generated between the billet 13 and the container liner 1a to the outside. 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 projection, 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 by screws 54 from the outside 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.

For this reason, even when 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 deteriorating due to 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, the end surface side of the extrusion stem 14 of the container 1 of the extrusion press device for a general-purpose machine shown in FIG. 15 (1) is entirely covered with a heat insulating seal block 55 as shown in FIG. 15 (2). 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).

Further, as shown in FIG. 13, 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 (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 end 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 end 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 two-part 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 position of the container 1 by a billet carrier (not shown), and the billet loader 111 is configured to hold the billet 13 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 the swing operation, a hydraulic drive cylinder device 132 is connected to the swing arm 128, and the swing arm 128 is driven by the expansion and contraction operation.

Here, a billet holding portion 133 that holds 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 such that the fixed dammy block 70 and the extruding stem 14 are bayonet-connected via the bayonet block 72, or the fixed dammy block 70 and the extruding 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. Extrusion stem 14
A bayonet block 72 is disposed on the front surface of the connection rod 76. The rear half of the bayonet block 72 is screwed to a screw provided at the tip of a connection rod 76 having an outer diameter cross section of a circle. I have. 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 deaeration control method in the extrusion press using the deaeration means will be described.

The deaeration control method will be described with reference to FIGS. As shown in FIG. 17, 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 separated from the die 3 is moved forward to separate the die 3 and the container 1 from each other. Abut

When this operation is completed, billet 1
The billet loader 111 rises while the billet 13 is placed, and holds the billet 13 at the center position. When the extrusion stem 14 is advanced (FIG. 16 and FIG. 17 (1)) from this state, the billet 13 is pushed into the container 1 (FIG. 17).
(2)). The inside of the vacuum tank 20 is already in a vacuum state of, for example, 0 to 5 Torr by the vacuum pump 21.
First, the billet 13 is pushed into the container 1 with the advance of the extrusion stem 14, and at the time of this pushing, the tip enlarged portion 49 of the fix dummy block 70 is positioned at the inner diameter of the projection 80, and the extrusion stem 14 is pushed. Stop once.

The advance of the extrusion stem 14 is temporarily stopped (FIG. 16).
At the same time, the cylinder 43 is actuated to start the advance of the two-piece seal block 40 (FIG. 16). The seal block 40 is advanced to the forward limit and the seal packing 44 is brought into contact with the outer peripheral surface of the extrusion stem 14 to perform the closing operation of the seal block 40 (FIGS. 16 and 17).
(3)). Subsequently, the extruding device 144 strongly presses the seal packing 41 disposed on the end surface side of the container 1 of the seal block 40 against the end surface side of the projection 80 to seal the space between the extruding stem 14 and the container 1. The deaeration space 31 between the die 3 and the billet 13 is communicated with the vacuum suction device 60 (FIG. 16).

In this case, deaeration is not started immediately at the same time as the above-mentioned sealing, but a timer (not shown) is used, for example, for Tu seconds (about 0.2 seconds) by the timer from the above-mentioned sealing.
After the lapse of time, the deaeration suction device 60 is activated, the electromagnetic switching valve 90 is excited, and vacuum suction is started in a state where the inside of the container 1 and the vacuum tank 20 can be ventilated (FIG. 16). The sealed air passes through a deaeration hole 45 provided in a part of the split seal block 40, and 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.

After the start of vacuum deaeration by the deaeration suction device 60,
After a timer (not shown) Tr seconds (approximately 0.2 to 0.3 seconds) has elapsed, the extrusion stem 14 that has been once stopped is started to advance again (FIG. 16). The billet 13 loaded in the container 1 is pressed by re-advancing the extrusion stem 14, and the billet 13 whose advance limit is regulated by the die 3 is crushed from the rear end (the extrusion stem 14 side). The air remaining in the degassing space 31 before such an extrusion phenomenon occurs is sucked and discharged by the degassing suction device 60. The inside of the vacuum tank 20 has already been
It is in a vacuum state of ５5 Torr.

When the electromagnetic switching valve 90 is excited in this state, the residual air in the container 1 becomes about 0.2 to 0.5 seconds when the vacuum suction is started by the vacuum tank 20 and becomes 5 to 30 Torr in the container 1. . And the extrusion stem 1
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. 17 (4)). .

The billet 13 gradually increases the pressure in the container 1 by the time the upset is completed, but when the pressure exceeds a preset pressure of a pressure switch PS (not shown) (FIG. 16), a timer (not shown). ) Are counted, and after the elapse of Ts seconds (about 5 to 6 seconds), the vacuum deaerator 60 stops the vacuum deaeration operation in the container 1 (FIG. 16).
). After stopping the vacuum deaeration operation, Tv
After a lapse of about 0.2 seconds (about 0.2 seconds), the seal packing 41 disposed on the end face side of the
The extruding device 144, which has been strongly pressed against the end surface of the container 0, is retracted to release the seal between the extruding stem 14 and the container 1 (FIG. 16 (10)).

At the same time as the extrusion device 144 is retracted, the retraction of the two seal blocks 40R and 40L is started (FIG. 16).
(11)). Then, the divided seal block 40R,
The seal 40L is operated in the opening direction, and finally, the two seal blocks 40R and 40L are fully opened to the original retreat limit position and stopped (FIG. 16 (12)).

On the other hand, after the re-advancement of the extrusion stem 14, the extrusion stem 14 continues to advance without rest and the billet 13 is crushed. Thereafter, the extrusion by the extrusion stem 14 is performed. When the extrusion is completed, the extrusion stem 14 is retracted and the next molding cycle is started.

[0073]

As is apparent from the above description, according to the present invention, by setting an appropriate timer, the idle time can be further shortened, and at the same time, the timer disposed on the end face of the container on the extrusion stem side can be realized. To close the split seal block in the direction intersecting with the axial direction of the extrusion stem and to press the pressing means more strongly against the end face of the projecting part of the container, the seal is sufficient, the degree of vacuum is high, and sufficient degassing can be performed. In addition, an extruded material without blisters is obtained, and the product yield is greatly improved.

[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 a flowchart showing a control procedure over time.

FIG. 17 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 Swivel center axis 132 Hydraulic drive cylinder device 133 Billet holding part 134 Pedestal 140 Opening / closing device 142 Base 144 Pressing device 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

Claims (1)

(57) [Claims] 1. A ring-shaped projection provided on an end face of an extrusion stem of a container having a container liner into which a billet is to be loaded, and a split seal provided to be openable and closable in a direction intersecting with the axial direction of the extrusion stem. When the seal block is closed, the seal block is attached to the contact surface of the seal block.
Seal member and the end face of the seal block on the container side.
A sealing member provided and an extrusion step of the seal block;
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 through a sealing member provided on the side of the ring-shaped projection. Using deaeration means arranged so that the pressing device to be pressed can be moved in the pushing direction, the billet loaded in the container is pushed forward by pushing the extrusion stem, and the container liner and the billet and the billet until the upset is completed. A method for controlling deaeration in an extrusion press apparatus using deaeration means, wherein air staying in a space formed between extrusion stems is deaerated and extruded according to a time set before the start of extrusion. .