JP2527515Y2 - Fixed dummy block for double-acting extrusion press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed dummy block having a double-acting extrusion breath.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of the tip of a conventional extrusion stem having a fixed dummy block. Conventionally, when extruding metal (eg, copper, aluminum, etc.) using a double-acting extrusion press, a free dummy block is interposed between the extrusion stem and the billet, and a fixed dummy block is attached to the tip of the extrusion stem. There was a case to be attached.

In a double-acting extrusion press using a free dummy block (the main purpose of which is to arrange a mandrel back and forth in the direction of the center axis of the extrusion stem to form a tube), the operation of the extrusion press is as follows. Was being done to First, the container is moved forward and abuts the die. Next, the billet and the dummy block are placed on the billet loader and the extruding stem side of the billet, and the billet loader is moved so that the cores of the billet and the dummy block are positioned coaxially with the container. Then, the extruding stem is advanced by operating the main ram, and the billet and the free dummy block are inserted into the container. Then, the extruding stem is advanced, and the tip of the extruding stem is brought into contact with the surface of the free dummy block. Next, the piersalum is actuated to advance the mandrel, insert the billet, and fix the tip at the tip of the mandrel at the center of the product extrusion section of the die. Subsequently, the main ram is advanced again to advance the extrusion stem, and the billet is strongly pressed to extrude the product tube from the die. After the billet extrusion is completed, the mandrel is retracted by operating the pierceram first, and then the extrusion stem is retracted by operating the main ram. Then, the container moving cylinder is operated to move the container away from the die, and then the cutting device is operated.
The product and discard are cut by lowering the cutting blade.

In an extrusion press using a fixed dummy block, a connection rod 42 provided with a screw at the tip thereof along the axial direction of the center of the extrusion stem 41 is arranged, and a dummy boss is provided at the tip of the extrusion stem 41. 4
0 and place the dummy boss 40 on the connection rod 4
2 After screwing into the screw at the tip, connect rod 4
2 was pulled to the non-container side. Further, the dummy boss 40 is pulled to the side opposite to the container to expand and contract the outer diameter of the dummy ring 43.

[0005]

In order to solve the above-mentioned problems, in the present invention, a mandrel is slidably provided in an extrusion stem, and the mandrel is provided at the tip of the extrusion stem. It has an insertion hole that can enter and exit, and is fitted with a fixed dummy block having a smaller diameter than the outer diameter of the extrusion stem, and furthermore, the rear end outer peripheral surface of the fixed dummy block is engraved on the concave step portion and at the position. A dummy ring holder having a donut shape and a screw engraved on the outer peripheral portion was fitted and disposed, and further, a reduced-diameter inclined portion directed in the extrusion direction was provided at the outer peripheral front end corner of the fixed dummy block. After the dummy ring engraved in the structure is coaxially fitted with the fixed dummy block and screwed with the dummy ring holder, the dummy ring is moved forward and backward. And front end portion of the dummy ring scaling diameter possible configurations.

Further, when a fixed dummy block is used, there is a disadvantage that it is impossible to arrange a mandrel at the center of the extrusion stem structurally.

[0007]

In order to solve the above-mentioned problems, in the present invention, a mandrel is slidably provided in an extruding stem, and the mandrel comes in and out of the tip of the extruding stem. A fixed dummy block having a possible insertion hole and a diameter smaller than the outer diameter of the extrusion stem is mounted, and a dummy ring is coaxially fitted on the outer peripheral surface of the fixed dummy block. The diameter of the dummy ring can be enlarged and reduced by moving the dummy ring back and forth.

[0008]

[Operation] First, the container is brought into contact with the die, and then the billet is loaded into the container. The extruding stem is advanced, and when the fixed dummy block comes into contact with the billet, the piercerum is actuated to advance the mandrel and insert the billet to fix the mandrel in that state. Subsequently, when the main ram is advanced to advance the extrusion stem and the billet is pressed, a product tube can be extruded from the die.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a fixed dummy block of a double-acting extrusion press according to the present invention.

FIG. 1 is a longitudinal sectional view of an extrusion press, FIG. 2 is a longitudinal sectional view showing a state in which a mandrel is inserted, and FIG. 3 is an explanatory view showing an extruded state.

In FIG. 1, reference numeral 21 denotes a main cylinder mounted on a fixed board 22, 23 denotes a main ram slidably mounted on the main cylinder 21, and 20 denotes a main ram 2.
The moving frame 20 is slid on a guide (not shown). The cylinder 25 attached to the fixed platen 22 is for moving the moving frame 20 forward and backward at a high speed.
Fixed to part of zero. The main ram 23 is used for pushing the moving frame 20 forward at a high output. Further, a piercer crosshead 27 is provided so as to be slidable in the axial direction, and the piercer crosshead 27 is mounted on a piercer ram 28 slidably mounted in a piercer cylinder 29. The piercer ram 28 is a ram for moving the piercer cross head 27 forward. A retraction cylinder (not shown) is attached to the piercer cross head 27.

Reference numeral 8a denotes a cylindrical extrusion stem attached to the distal end of the moving frame 20, reference numeral 5 denotes a mandrel slidably provided in the extrusion stem 8a, and the mandrel 5 is fastened to the mandrel holder 6 by screws, and a worm. The mandrel holder 6 is rotated by the mechanism 7 or a screw between the mandrel 5 and the mandrel holder 6 is tightened. And
The mandrel 5 and the mandrel holder 6 are held by a main crosshead 8, and the mandrel 5 and the main crosshead 8 are reciprocated by separate hydraulic mechanisms.

As shown in FIG. 1, a container holder 1 is mounted at a position facing a die 3c provided in contact with an end platen 2 by a hydraulic cylinder 4 so as to be movable in a horizontal axis direction. And a billet is stored in the container 1a. On the other hand, a billet loader 9 is installed at an intermediate position between the container holder 1 and the main crosshead 8, and a mandrel changing device is also arranged at the position of the billet loader 9.

The lower end of the end platen 2 facing the main crosshead 8 projects from the die support 1.
2, a die slide 11 is slidably mounted in the machine width direction. A die assembly including a bolster 3a, a die backer 3b, a die 3c, and a die ring 3d is held on the die slide 11. The die slide 11 is moved in the machine width direction by a cylinder (not shown) provided on the side of the end platen 2. In addition, it is possible to reciprocate between an extrusion operation position located on the back surface of the end platen 2 (the surface on the side of the extrusion cylinder 10) and a die exchange position pulled out from the back surface of the end platen 2.

In the present invention, as shown in FIGS. 2 and 3, the mandrel 5 is disposed so as to be able to move back and forth along the axis of the center of the extrusion stem 8a.
A fixed dummy block 30 having a smaller diameter than the outer diameter of the extrusion stem 8a is screwed to the screw portion 31 at the tip of the extruding stem 8a. Furthermore, the fixed dummy block 30
The outer peripheral surface of the central region of the above is engraved in a shape having a concave step portion 32, and a dummy ring holder 33 having a donut shape and having a screw engraved on the outer peripheral portion thereof is fitted. It is arranged. Fixed dummy block 3 described above
The inclined part 30 is formed at the corner of the outer peripheral front end (the side opposite to the extrusion stem 8a).
a, the dummy ring 3
When 4 is fitted along the outer periphery of the fixed dummy block 30, the outer peripheral front end inclined portion 30a of the fixed dummy block 30 and the outer peripheral front end inclined portion 34a of the dummy ring 34 exhibit a superimposed state.

In FIG. 3A, when the distal end of the dummy ring 34 projects from the end surface of the fixed dummy block 30 attached to the distal end of the extrusion stem 8a by a distance L, the outer diameter of the dummy ring 34 is reduced. D ₁ is the container 1a
Smaller than the internal diameter D ₀ only 2S, extrusion stem 8a becomes movable in the container 1a removably to. However, immediately below the pressing of the billet 10 when the extrusion stem 8a is further advanced, both front end surfaces of the fixed dummy block 30 and the dummy ring 34 are flush with each other, and the front end of the dummy ring 34 has receded by a distance L. Present state.
At this time, when the dummy ring 34 is retracted, the outer peripheral front end inclined portion 34a of the dummy ring 34 climbs on the outer peripheral front end inclined portion 30a of the fixed dummy block 30. For this reason, the diameter of the dummy ring 34 is expanded.

Next, the dummy ring 34 is inserted and fitted along the axial direction of the fixed dummy block 30, and screwed and mounted on the dummy ring holder 33. When the dummy ring 34 is mounted, the dummy ring 34 on the container 1a side and the end face of the fixed dummy block 30 are in a state where the dummy ring 34 protrudes from the fixed dummy block 30 by a distance L. As mentioned above,
Under such a state, the extrusion stem 8a is advanced to move the container 1
When the billet 10 loaded in a is pressed, only the dummy ring 34 is retracted by the distance L, and the front ends of the dummy ring 34 and the fixed dummy block 30 are flush. At this time, the dummy ring 34 is configured to have a gap by the distance L between the dummy ring 34 and the extrusion stem 8a so that the dummy ring 34 can be retracted by the distance L while being screwed to the dummy ring holder 33.

Next, the operation of the fixed dummy block of the double-acting extrusion press of the present invention will be described with reference to FIGS.

First, the container 1a is advanced and the dies 3c
Abut. Next, the billet 10 is placed on a billet loader (not shown), the billet loader is moved to load the cylindrical billet 10 into the container 1a, and the main ram 23 is advanced to fix the tip of the extrusion stem 8a. The contact is made via the dummy block 30.

Next, the mandrel 5 is advanced by operating the pier salam 28, and the billet 10 is inserted to fix the tip portion 5a of the mandrel 5 at the center of the product extruding portion of the die 3c. Subsequently, the main ram 23 is advanced again to advance the extrusion stem 8a, and the billet 10 is pressed to extrude a tube as a product from the die 3c. After the extrusion of the billet 10 is completed, the piersalum 28 is operated first to retract the mandrel 5, and then the main ram 23 is activated to retract the extrusion stem 8a. At this time, the dummy ring 34 returns to the outer diameter _D 1 which is the original diameter from the outer diameter _D 1 that is enlarged _{(D 0} to the same) _(D 0 -2S the same).
Therefore, a thin layer of aluminum (remaining residue) adhering to the inner wall of the container 1a and the reduced outer diameter D _{1 of the} dummy ring ₁
The protrusion 36 of the dummy ring 34 does not scratch the thin layer of aluminum when the extrusion stem 8a is retracted. Thereby, the dummy ring 34
A thin layer of aluminum gradually adheres to the outer peripheral surface of the container, and the extruding stem 8a and the two cores of the container 1a are eccentric. For this reason, when loading the extrusion stem 8a into the container 1a, it is difficult to maintain the precision of the two shaft cores. Also, a thin layer of aluminum is deposited on the outer peripheral surface of the dummy ring 34, which requires a processing time.

Subsequently, a container moving cylinder (not shown) is operated to separate the container 1a from the die 3c. Next, the cutting device is operated and the cutting blade is lowered to cut the product and discard to complete a series of operations.

[0022]

As is apparent from the above description, in the present invention, a mandrel is slidably provided in the extrusion stem, and an insertion hole through which the mandrel can enter and exit is provided at the tip of the extrusion stem. A fixed dummy block having a diameter smaller than the outer diameter of the extrusion stem is attached thereto, and further, a rear end outer peripheral surface of the fixed dummy block is engraved in a concave step portion and a donut shape is provided at the position. A dummy ring holder in which a screw is engraved on the outer peripheral portion is fitted and disposed, and a dummy engraved in a structure having a reduced-diameter inclined portion directed in the extrusion direction at the outer peripheral front end corner of the fixed dummy block. After the ring is coaxially fitted with the fixed dummy block, the ring is screwed with the dummy ring holder, and the dummy ring is moved forward and backward so that the dummy ring is moved forward and backward. By having the front end to scaling diameter possible configuration facilities, free dummy block processing in the case of using the free dummy block is unnecessary. For this reason, the space occupied by the equipment is reduced, and maintenance and inspection related to the equipment are not required. The processing operation of the free dummy block is eliminated, and the idle time of the extrusion press can be reduced. Further, a structure in which a mandrel is arranged in a fixed dummy block, which has been impossible in the past, is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an extrusion press according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which a mandrel is inserted.

FIG. 3 is an explanatory diagram showing an extruded state.

FIG. 4 is a sectional view of a distal end portion of a conventional extrusion stem having a fixed dummy block.

[Explanation of symbols]

 Reference Signs List 1 container holder 1a container 2 end platen 3c dice 5 mandrel 8 main crosshead 8a extrusion stem 9 billet loader 10 billet 11 die slide 20 moving frame 21 main cylinder 23 main ram 27 piercer crosshead 28 piersalam 29 piercer cylinder 30 fixed dummy block 33 Dummy ring holder 34 Dummy ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed dummy having a mandrel slidably provided in an extrusion stem, an insertion hole through which the mandrel can enter and exit at the tip of the extrusion stem, and having a diameter smaller than an outer diameter of the extrusion stem. The block is mounted, and the outer peripheral surface of the rear end of the fixed dummy block is concave.
Engraved on the step and has a donut shape at that position
A dummy ring holder with a screw engraved on the outer periphery
The fixed dummy block
It has a tapered slope in the extrusion direction at the outer front corner.
The dummy ring engraved on the fixed dummy
The dummy ring holder after coaxially fitting with the block
The by screwed to the forward-reverse the dummy ring and
A fixed dummy block of a double-acting extrusion press, wherein a front end of a dummy ring is configured to be able to expand and contract a diameter. "