JP3028892B2 - Extrusion press extrusion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion apparatus for an extrusion press for an aluminum alloy or the like, and more particularly, to a press plate portion called a fixed dummy block at the tip of an extrusion stem for deaeration of air in a container. It is about technology.

[0002]

2. Description of the Related Art After a billet having a diameter slightly smaller than the inner diameter of a container is placed in the container, the billet is pressed by a stem behind the billet and pressed against a die in the container. In other words, when the upset is performed, the billet is crushed, and the container and the billet are crushed. The air during is compressed. In order to suck the compressed air from the fixed dummy block on the stem side, for example, a core having a pressure pad and a hollow extruded stem which wraps the core with a slight gap from the core have been used. I have.

However, when degassing from the pressure pad of the fixed dummy block at the tip of the stem, the degassing passage area is small and the ultimate vacuum is low. In addition, vacuum is evacuated from the gap between the core and the hollow extruding stem that wraps the core. If this gap is not made large, air cannot be sufficiently suctioned. Conversely, if this gap is made large, the core becomes large. Becomes unstable, and an aluminum alloy or the like intrudes into this gap when the billet is upset, impairing the function of the fixed dummy block.

[0004]

However, in the above-described air bleeding, the gap between the core and the hollow extruding stem that wraps the core cannot be made large, and the step at the tip of the fixed dummy block is in the initial stage of upsetting the billet. And the above-mentioned gap is collapsed and deaeration cannot be performed.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to remove all air that can be sucked from the stem side until the billet in the container is upset. It is to suck in the fixed dummy block.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and has a fixed dummy block which can be in close contact with the inner surface of a container at the tip of an extrusion stem. A core block having an outer ring that can expand in an outer radial direction and a deaeration valve device in the outer ring that is connected to a deaeration passage in the extrusion stem at a tip end of the shaft; A plurality of air vent grooves are radially provided on the tip end surface of the block.

[0007]

When the billet in the container is pushed by the 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. Even if a part of the air is sucked from the die side, the rest of the air will be sucked from the stem side.
At this time, the air in the space between the container and the billet is sucked through the outer ring of the fix dummy and the air vent groove of the core block, and passes through the deaeration valve inside the core block. Here, the outer ring of the fixed dummy, the air vent groove of the core block, and the passage to the deaeration valve have a depth that does not collapse even if the billet is pushed in with the fixed dummy and has no support for sucking air. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a fixed dummy block with a deaeration valve according to the present invention, and FIG. 2 is a view taken along the line BB of FIG. In FIG. 1, 1 is a container of an extrusion press, 2 is a billet which is a material to be extruded in the container 1, 3 is a space between the inner surface of the container 1 and the outer peripheral surface of the billet 2, 4 is an extrusion stem, and 15 is an extrusion stem. This is a fixed dummy block provided at the tip of the extrusion stem 4.

The fixed dummy block 15 includes a dummy block rear member 11 attached to a distal end portion of a tubular member 16 fixedly provided at an axial portion in the extrusion stem 4 with a screw 16a, and a distal end of the rear member 11. Screw 1 on outer periphery
1a, which is located in the outer ring 5 and the outer ring 5 whose distal end portion is spread in the outer diameter direction and can be in close contact with the inner peripheral surface of the container 1, and is fixed to the axial center portion of the rear member 11. The core block 7 is attached to the distal end portion of the provided tubular adapter 17 with a screw 17a. The dummy nut 6 is provided inside the distal end of the core block 7 with a screw 7a. And the like.

The deaeration valve device comprising the dummy nut 6 and the deaeration valve 8 is a valve seat type valve as shown in FIG.
The deaeration passage 10 on the rear side of the deaeration valve 8 is closed. The deaeration valve 8 is normally slightly opened by the action of the rear disc spring 18, but is closed by the action of the billet 2 at the time of extrusion. The deaeration passage 10 of the deaeration valve device is connected to an external passage (not shown) through an internal passage 8a behind the deaeration valve 8, a deaeration passage 12 in the adapter 17, and a deaeration passage 16b in the tubular member 16. Is connected to a vacuum suction device. Reference numeral 19 denotes a rear side of the dummy nut 6, nuts attached to the rear of the deaeration valve 8, and 13, 14, and 14a denote stop pins.

A contact surface between the inner peripheral end of the outer ring 5 and the outer peripheral end of the core block 7 is provided with a tapered surface 20 extending toward the outer periphery of the distal end.
Of the container 1 spreads outward due to the pressing force from the billet 2 at the time of extrusion, and can come into close contact with the inner peripheral surface of the container 1. The tip surfaces of the core block 7 and the dummy nut 6 are provided so as to protrude slightly from the tip surface of the outer ring 5. This is so that when the billet 2 is pressed, the outer peripheral portion of the rear surface of the billet 2 does not immediately come into contact with the tip surface of the outer ring 5. This is because it can be performed.

As shown in FIGS. 1 and 2, the outer ring 5,
On the tip surface of the core block 7 and the dummy nut 6,
A plurality of air vent grooves 9 are provided radially, for example, four. Further, the tip surface of the deaeration valve 8 is also provided so as to be retracted from the tip surface of the dummy nut 6. This is because even if the front end surface of the fixed dummy block 15 hits the rear end surface of the billet 2, degassing can be performed easily and reliably. That is, even if a part of the billet 2 enters the air vent groove 9 during extrusion, the air vent groove 9 has such a depth that the air vent groove 9 is not immediately shut off.

The area of the degassing valve 8 on the billet 2 side is about 10% of the sectional area of the billet 2. The size of the air vent groove 9 is, for example, 3 to 5 mm in width and 2 to 4 mm in depth.

The air in the space 3 between the container 1 and the billet 2 flows as shown by the arrow in FIG. As mentioned above,
When the billet 2 is pushed into the die (not shown) by the extrusion stem 4 via the fixed dummy block 15, first,
The outer ring 5 spreads outward to seal the gap with the container 1 to prevent outside air from entering the space 3. The flat portions of the dummy nut 6 and the core block 7 on the side of the billet 2 are in close contact with the billet 2. However, at this time,
The distal end surface of the outer ring 5 has not yet come into close contact with the billet 2. The inside of the air vent groove 9 cut into the outer ring 5, the core block 7, and the dummy nut 6 does not adhere to the billet 2. Also, the billet 2 side surface of the deaeration valve 8 does not adhere to the billet 2. Therefore, deaeration is sufficiently performed.

Further, even if the extrusion by the extrusion stem 4 continues, the air release groove 9 is not collapsed until all the air in the space 3 of the container 1 and the billet 2 is sucked, and the air in the space 3 is removed by the air release groove 9. , And is sucked into the hollow shaft of the extrusion stem 4 through the deaeration passage 10 and the deaeration passage 12. Finally, the final stage of the extrusion by the extrusion stem 4 is started, and the center of the rear part of the billet 2 pushes the deaeration valve 8, and the deaeration valve 8 is closed. Even if a part of the billet 2 enters the space on the tip end side of the air vent groove 9 or the deaeration valve 8, the billet 2 is integrated with the discard, which is a scrap, so that it can be easily taken out after extrusion.

[0016]

As described above, according to the present invention, a fixed dummy block which can be in close contact with the inner surface of a container is provided at the tip of the extrusion stem, and the fixed dummy block is provided with an outer ring whose tip can expand in the outer diameter direction. When,
The deaeration valve device in the outer ring, which is connected to the deaeration passage in the extrusion stem, is constituted by a core block having a shaft end, and an air vent groove is formed radially in the end surface of the outer ring and the core block. Since the plurality of pieces are provided, the air in the container can be reliably and easily degassed before the billet is completely crushed during extrusion. Also, since the outer ring spreads out and comes into close contact with the inner surface of the container during extrusion, the container and the outer ring are sealed, and there is no danger that air will flow backward. As described above, since the inside of the container can be sufficiently deaerated, it is possible to reliably and easily obtain a high-quality extruded product that does not involve air.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Billet 3 Space part 4 Extrusion stem 5 Outer ring 6 Dummy nut 7 Core block 8 Deaeration valve 9 Air release groove 10, 12, 16b Deaeration passage 11 Dummy block rear member 15 Fixed dummy block 18 Disc spring 20 Tapered surface

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 27/04 B21C 26/00

Claims (1)

(57) [Claims] 1. A fixed dummy block, which can be in close contact with the inner surface of a container, is provided at the tip of an extrusion stem. Extrusion of an extrusion press in which the deaeration valve device connected to the deaeration passage is constituted by a core block having a shaft end, and a plurality of air vent grooves are provided radially on the outer ring and the end surface of the core block. apparatus.