JP4986113B2 - Extrusion equipment - Google Patents

Description

  In the present invention, at the time of extrusion molding with an extrusion press of an aluminum alloy or the like, the sealing member disposed on the container side of the degassing means is closed by a pressing device at the same time as closing with the degassing means configured to be detachable from the extrusion stem. Concerning an improved extrusion apparatus for extruding the billet after it has been pressed against the container and before the billet is pushed out, to expel the air between the container and the billet out of the container, effectively excluding air and without waste It is.

  After a billet with a diameter slightly smaller than the inner diameter of the container is loaded into the container, the billet in the container is pressed against the die by the rear extrusion stem, so-called upsetting, the billet is crushed and the air between the container and the billet is compressed. The In order to discharge this compressed air from the fixed dummy block side of the extrusion stem to the outside of the container, for example, a ring-shaped seal portion provided on the end surface on the extrusion stem side of the container having a container liner loaded with a billet A seal block divided into two in the direction intersecting the axial direction of the extrusion stem, a seal member adhered to the contact surface of the seal block when the seal block is closed, and an end surface on the extrusion stem side of the seal block The side end surface of the ring-shaped seal portion and the outer peripheral surface of the extrusion stem can be brought into close contact with each other via the seal member, and the seal member provided on the container-side end surface of the seal block is pressed against the ring-shaped seal portion. Equipped with a deaeration device with the device movably arranged in the axial direction of the extrusion stem, the container is sealed with a sealing material. How to suction degassing from the gap between the fixed dummy block outer peripheral surface and the container inner circumferential wall is disclosed in public JP 10-128432.

In the conventional method, when the billet is upset, aluminum alloy or the like does not invade the gap between the outer peripheral surface of the fixed dummy block and the inner peripheral wall surface of the container and does not impair the function of the fixed dummy block. The clearance between the outer peripheral surface of the fixed dummy block and the inner peripheral wall surface of the container is set so as to secure a sufficient area and sufficiently suck the air in the container to obtain a predetermined degree of vacuum.
However, the fixed dummy block outer peripheral surface and the container inner peripheral wall surface are subject to changes over time, such as wear on the outer peripheral surface of the fixed dummy block, a decrease in diameter expansion function, and the adhesion of the aluminum alloy rod attached to the inner peripheral surface of the fixed dummy block to the outer peripheral surface of the fixed dummy block It is difficult to maintain a constant gap between the container and the deaeration passage area and the deaeration cannot be performed sufficiently, resulting in variations in the degree of vacuum in the container.
JP 10-128432 A

The problem to be solved by the invention is that the deaeration passage area changes during deaeration extrusion using an extrusion press such as an aluminum alloy, so that the deaeration cannot be performed sufficiently and the degree of vacuum in the container varies. .
An object of the present invention is to provide an extrusion molding apparatus in which a predetermined degassing passage is ensured and sufficient degassing is performed during degassing extrusion molding of an aluminum alloy or other extrusion press so that the degree of vacuum in the container does not vary. There is to do.

The present invention has been made in order to achieve the above object, have a sealing member and sealing means for sealing the end face and the outer peripheral surface of the extrusion stem of the container, forward before upsetting operation after inserting the billet into the container An extruding machine having a degassing means for a container that moves to form a degassing circuit and moves backward when the inside of the container reaches a predetermined vacuum degree, A fixed dummy block that can be closely contacted is provided, and the fixed dummy block is composed of an outer ring whose front end portion can extend in the outer shape and a dummy core that is connected to the deaeration passage in the outer ring and is movable in the axial direction. by having a degassing valve apparatus in the axial tip, reduced diameter portion of the hourglass shape on the outer peripheral surface of the outer ring is provided, form a degassing circuit Wherein said inside said through a plurality of outer ring degassing passage disposed in the reduced diameter portion container degasser is characterized in that in communication when the.

A deaeration valve device is provided at the tip end of the fixed dummy block at the tip of the extrusion stem so that air in the container is sucked and discharged from the fixed dummy block shaft to the outer periphery of the fixed dummy block. Predetermined deaeration passage area can be secured without being affected by changes in the outer periphery of the block over time or extrusion soot accumulating in the deaeration passage, sufficient deaeration can be performed, and variations in the degree of vacuum in the container occur There is nothing.
And since the deaeration means which has a seal by the sealing member and the sealing means on the end surface of the container and the outer peripheral surface of the extrusion stem is provided, the seal of the container is sufficient, the ultimate vacuum is high, and the deaeration can be performed sufficiently.
Further, the seal member is separated until it comes into contact with the end surface of the container and the outer peripheral surface of the extrusion stem, avoids the influence of heat, has a long life of the seal material, and can stably maintain the seal performance.

When retracting the extrusion stem after billet extrusion, it is separated from the extrusion stem and container so that no soot such as aluminum alloy scraped by the outer peripheral surface of the fixed dummy block is deposited on the seal member. High sealing performance can be maintained over a long period of time.
Thus, since the deaeration in the container can be performed sufficiently and without variation, it is possible to obtain a high-quality extruded material that does not involve air.

Below, embodiment of the extrusion molding apparatus of this invention is described in detail using FIGS. 1-3. However, FIG. 4 shows the comparative example compared with the extrusion molding apparatus of this invention embodiment, and does not represent embodiment of this invention.
FIG. 1 is an explanatory view showing an outline of an extrusion molding apparatus according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG.

As shown in FIG. 1, a container cylinder 13 for sliding a container 12 composed of a container liner 12a, a container tire 12b, and a container holder 12c is disposed on the end platen 11 side. Reference numeral 13a denotes a cylinder tube constituting a part of the main body of the container cylinder 13, reference numeral 13b denotes a piston, and reference numeral 13c denotes a piston rod.
Reference numeral 14 denotes a die, and the die 14 is slidably fitted and held on the inner peripheral surface of a die ring (not shown). Reference numeral 16 denotes a gap between the inner peripheral wall surface of the container liner 12a and the outer peripheral surface of the billet 17, and is also a deaeration space. On the other hand, a fixed dummy block 19 that can be in close contact with the inner peripheral wall surface of the container liner 12a is provided at the tip of the extrusion stem 18 into which the billet 17 is pushed.
Reference numeral 20 denotes an extruded material that is extruded from the die 14 by the billet 17 being crushed as the extrusion stem 18 advances.

Deaeration means 21 for sucking and removing the compressed air in the deaeration space 16 in this embodiment will be described.
First, the deaeration means 21 for sucking and removing air from the extrusion stem 18 side in the container 12 is disposed on the extrusion stem side end surface of the container 12 and is provided so as to be openable and closable in the direction intersecting the axial direction of the extrusion stem 18. When the seal block 22 is closed, the seal block 22 is brought into close contact with the outer peripheral surface of the abutment surface 35 and the extrusion stem 18, and the seal block 22 is moved in the axial direction of the extrusion stem 18 to be placed on the container end surface. The container 12 is sealed by bringing the seal block into close contact. Reference numeral 23 denotes a pressing device for moving and pressing the extrusion stem 18 of the seal block 22 in the axial direction.
The deaeration means 21 has a vacuum suction device 24. The vacuum suction device 24 includes a vacuum pump 25, a vacuum tank 26, a solenoid valve 27, a vacuum gauge 28 a, and the like, and the deaeration space 16 via the deaeration means 21 and the pipe 29 when suction and deaeration in the container 12 are performed. It becomes the composition which communicates.

  2 and 3, the seal block 22 moves in a direction crossing the axial direction of the extrusion stem 18 and seals closely to the outer peripheral surface of the extrusion stem 18 or the fixed dummy block 19. 30, a seal member 31 that moves in the axial direction of the extrusion stem 18 and seals closely to the ring-shaped seal portion 34 on the container side end surface, and a seal that closely contacts the contact surface 35 when the seal block 22 is closed A sealing material 32 is attached. Reference numeral 36 denotes an opening / closing device for moving the seal block 22 in a direction crossing the axial direction of the extrusion stem 18.

  Of the sealing materials 30, 31, and 32 shown above, the materials of the sealing materials 30 and 31 are preferably relatively hard and heat resistant, for example, silicon rubber or fluoro rubber processed into a string shape. The sealing material 32 is preferably a heat-resistant material such as silicon rubber or fluorine rubber processed into a sponge-like sheet. As shown in FIG. 2, the sealing materials 30 and 31 are separated from each other by two so as to prevent air from entering from the outside during deaeration. However, the present invention is not limited to this. In order to maintain the ultimate degree of vacuum, it is preferable to dispose them in three rows or more.

Next, the fixed dummy block 19 provided at the tip of the extrusion stem 18 will be described.
As shown in FIG. 2, the fixed dummy block 19 includes a connecting rod 41 that is screwed with a screw that is screwed to the distal end portion of the extrusion stem 18, and a screw and screw that is screwed to the distal end portion of the connecting rod 41. The outer end 42 of the hourglass shape that can be in close contact with the inner peripheral surface of the container 12 by spreading its tip end in the outer diameter direction, and the tip part of the outer ring 42 and the connecting rod 41 is tapered in the axial center. And a dummy core 44 that forms an annular gap serving as a deaeration passage 45 with the outer ring 42 and an adapter 46 that is connected to the dummy core 44 with a screw. Has been.

The exhaust valve device 50 including the outer ring 42 and the dummy core 44 has a tapered valve seat 43b on the inner surface of the outer ring 42 as shown in the figure, and the valve seats 43a and 43b come into contact with each other to form an annular deaeration passage. 45 is closed. A plurality of outer ring deaeration passages 48 communicating with the annular deaeration passage 45 are provided at the substantially central portion of the hourglass shape of the outer ring 42.
The exhaust valve device 50 is normally opened by the action of the elastic body 47 in the connecting rod 41. However, the reaction force of the billet 17 at the time of extrusion acts on the dummy core 44 to be closed. The deaeration passage 45 of the exhaust valve device 50 is configured to communicate with the vacuum suction device 24 via a plurality of outer ring deaeration passages 48 and a seal block deaeration passage 49.

  As described above, since the tapered valve seat 43a of the dummy core 44 and the tapered valve seat 43b of the outer ring 42 are in contact with each other by the reaction force of the billet 17 during extrusion, the deaeration passage 45 is blocked. The front end portion of the outer ring 42 extends toward the outer periphery, and can come into close contact with the inner peripheral wall surface of the container 12. Further, the front end surface of the dummy core 44 is provided so as to slightly protrude from the front end surface of the outer ring 42. This is because when the billet 17 is pushed, the end surface of the billet 17 on the side of the extrusion stem is not immediately brought into contact with the tip surface of the outer ring 42, so that the deaeration can be performed easily and reliably.

Next, the extrusion operation of the extrusion molding apparatus will be described.
As shown in FIG. 1, first, pressure oil is supplied to the rod 13c chamber of the container cylinder 13, the piston 13b is moved in the extrusion direction, and the die 14 and the container 12 are brought into contact with each other. Next, when the billet loader (not shown) on which the billet 17 is placed rises and the extrusion stem 18 is advanced, the billet 17 is pushed into the container 12. And the advancement of the extrusion stem 18 is stopped in a state in which the extrusion stem side end surface of the billet 17 is pushed inward from the extrusion stem side end surface of the container, the deaeration means 21 is operated, and the clearance between the container 12 and the billet 17 is reached. A certain deaeration space 16 and the vacuum suction device 24 are communicated with each other.

As shown in FIGS. 2 and 3, the seal block 22 is closed by operating the opening / closing device 36, and then the seal block 22 is closed by operating the pressing device 23. Press against the seal 34. By these operations, the contact surface 35 of the seal block 22, the outer peripheral surface of the extrusion stem 18, and the end surface on the extrusion stem side of the container 12 are sealed by the respective sealing materials 30, 31, 32, and the container 12 is sealed. And the air in the deaeration space 16 is discharged | emitted by starting the vacuum suction apparatus 24. FIG.
The exhaust air in the deaeration space 16 is discharged from the end face gap between the billet 17 and the outer ring 42 of the fixed dummy block 19, the tapered annular gap between the outer ring 42 and the dummy core 44, the annular deaeration passage 45, and the plurality of outer This is performed by the vacuum suction device 24 through the ring degassing passage 48, the seal block degassing passage 49 and the pipe 49.

The start-up timing of the vacuum suction device 24, that is, the start of degassing is any time before the start of the upset after loading the billet 17 in the container 12, at the same time as the start, or after a predetermined time after the start of the upset. A suitable start time suitable for the conditions of extrusion is selected. Further, it is detected that the deaeration space 16 has reached a predetermined degree of vacuum, and the deaeration is terminated.
After detecting that the upset of the billet 17 has been completed, extrusion is started as the extrusion stem 18 advances, and the extruded material 20 is extruded from the die 14.

On the other hand, when the deaeration means 21 detects that the predetermined degree of vacuum has been reached and the vacuum suction device 24 stops, it operates the pressing device 23 and the opening / closing device 36 to return to the respective backward limit positions, and the next operation. Wait in preparation. After that, the extrusion operation continues and extrusion of the extruded material 20 is performed. When the extrusion is completed while leaving a predetermined discard dimension, the extrusion stem 18 is retracted, and the discard is separated from the container 12 and cut. The next cycle will be entered.
Here, the forward movement of the extrusion stem 18 refers to the movement in the direction of entering the container 12, and the backward movement refers to the movement in the direction of exiting the container 12.

  As described above, the container sealing means and the air discharging means are provided for the air in the container, and the air in the container is provided with a discharge valve device at the center of the tip end of the fixed dummy block. Since it is decided to suck and remove from the passage inside the extrusion stem, the extrusion molding apparatus according to the present invention can sufficiently deaerate by securing a predetermined deaeration passage area, and a container caused by a change in the outer peripheral surface of the fixed dummy block over time. There is no variation in the degree of vacuum inside.

Further, a ring-shaped seal portion provided on the end surface on the side of the extrusion stem of a container having a container liner loaded with a billet, a two-part seal block provided so as to be openable and closable in a direction crossing the axial direction of the extrusion stem, and a seal When the block is closed, the seal block can be brought into close contact with the outer peripheral surface of the extrusion stem at the same time via the seal material adhered to the contact surface of the seal block and the seal member provided on the end surface on the extrusion stem side of the seal block. The deaeration means in which the pressing device for pressing the sealing member provided on the end surface of the container against the ring-shaped seal portion is arranged so as to be movable in the axial direction of the extrusion stem has a sufficient container seal and a high degree of vacuum. I can do my best.
In addition, the configuration in which the sealing material can be easily replaced by sticking does not cause a reduction in productivity because the sealing material replacement time is short.

It is explanatory drawing which shows the outline | summary of the extrusion molding apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is sectional drawing seen from AA of FIG. It is explanatory drawing which showed the comparative example compared with the extrusion molding apparatus of this invention embodiment.

Explanation of symbols

12 Container 12a Container liner 16 Deaeration space 17 Billet 18 Extrusion stem 19 Fixed dummy block 20 Extrusion material 21 Deaeration means 22 Seal block 23 Press device 24 Vacuum suction devices 30, 31, 32 Seal material 34 Ring-shaped seal portion 35 Contact Surface 36 Opening / closing device 42 Outer ring 44 Dummy core 45 Deaeration passage 50 Exhaust valve device

Claims (1)

Have a sealing member and sealing means for sealing the end face and the outer peripheral surface of the extrusion stem of the container, with and moved forward before upsetting operation after inserting the billet to form a degassing circuit in the container, in the container An extrusion molding machine equipped with a degassing means for a container that moves backward by reaching a predetermined degree of vacuum ,
A fixed dummy block that can be in close contact with the container is provided at the distal end of the extrusion stem, and the fixed dummy block is connected to the deaeration passage in the outer ring and the outer ring whose distal end portion can extend in the outer direction. A deaeration valve device composed of a movable dummy core at the tip of the shaft center,
A drum-shaped reduced diameter portion is provided on the outer peripheral surface of the outer ring, and when the deaeration circuit is formed, the inner ring and the degassing portion are disposed through a plurality of outer ring deaeration passages arranged in the reduced diameter portion. An extrusion molding machine characterized in that gas means is in communication.

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