JP2856294B2 - Dummy block for indirect extrusion press and its replacement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dummy block for an indirect extrusion press and a device for replacing the same, and more particularly to a dummy block for an indirect extrusion press and a device for replacing the same, which facilitates the work of replacing the dummy block.

[0002]

2. Description of the Related Art In a mandrel tube forming method by an indirect extrusion press, a billet is loaded in a container, one end of the billet is pressed by an extrusion stem on a main ram side, a die is inserted from the other end of the container, and piercing is performed by a mandrel. Thereafter, a predetermined extruded product is manufactured by pressurizing and moving with a die stem. In such an indirect extrusion press, a dummy block is mounted on the extrusion stem side to support the end face of the billet.

[0003] The structure of the dummy block is fixed to the extrusion stem and is used continuously by performing extrusion a plurality of times (fixed dummy block), and the extrusion stem has a free structure and is placed in the container together with the billet. There is a type (free dummy block) which is loaded and taken out after completion of each extrusion. Such a dummy block is appropriately replaced by a change in the specifications of a die or a container.

[0004] In the former case, the dummy block is used continuously in a plurality of extrusions. However, when the dummy block is replaced or the dummy block is cared for (when aluminum chips adhere to the inner diameter portion of the dummy block, or when the inner diameter portion is damaged). , Etc.), the press cycle had to be stopped and the operator had to enter the machine. The replacement work is performed by crane work, and after removing the old block, the new block is attached.

In the case of the latter free dummy block,
After one press is completed, the extrusion stem is moved backward, and the container is moved so that the dummy block projects from the container. The striker strikes the dummy block to separate it from the discard, and separates it from the discard. The dummy block is carried out of the machine by the above device. Then, the discard is further cut and separated from the die by a shear.

[0006]

However, in the conventional replacement work, when the fixed dummy block is detached from the stem as described above, the crane work is performed after the press cycle is stopped. There is a problem that the operation is very bad and the operation is unstable, which may cause danger.

In the case of a free dummy block, the separation of the dummy block and the cutting of the discard are performed during the press cycle, so that there is a problem that the idle time is lengthened and the working efficiency is greatly reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dummy block for an extrusion press and an apparatus for exchanging the dummy block, in which the replacement of the dummy block can be performed safely and efficiently by focusing on the above-mentioned conventional problems.

[0009]

In order to achieve the above object, a dummy block for an extrusion press according to the present invention comprises a closing plate which is attached to a tip of an extrusion stem and abuts against a billet loading port of a container, and faces a dummy block. A slide fitting portion is formed in the portion along a direction orthogonal to the stem axis direction, and the portion can be attached and detached by lateral movement with respect to the closing plate.

In addition, the present invention provides an extruding press dummy block exchanging apparatus, comprising a traversing table installed so as to be able to move in and out of a standby position of a dummy block attached to the tip of an extrusion stem. Is slidably fitted to the closing plate that abuts the billet loading port of the container along the moving direction of the traversing table and is detachably attached to the traversing table. A gripping arm means is provided, and the dummy block attached to the closing plate can be replaced by the gripping arm.

[0011]

According to the above construction, the dummy block is slidably fitted to the closing plate in a direction orthogonal to the pushing direction, so that the separation movement in the pushing direction is restricted.
In addition, during the extrusion operation, the dummy block is fitted into the mandrel with the spigot, and is inserted into the billet loading opening of the container and is held at the position, so that it does not come off the closing plate. Therefore, even if the mandrel return and the ram return are performed, since the dummy block is supported by the mandrel and the spigot fitting, it is not necessary to replace the dummy block every time, and the next press cycle can be directly started. When replacing the dummy block, the dummy block is moved backward to the standby position during the discard cutting / separating operation in the pressing process, and the traversing table is driven to move the gripping arm means mounted on the dummy table to the dummy. Move to the position directly below the block. Then, the arm may be closed to grip the dummy block, and the traversing table may be moved to the side in this state. At this time, since the dummy block is only connected to the closing plate via the slide fitting portion, the dummy block can be easily separated by keeping the sliding direction and the table traversing direction. The new dummy block can be similarly easily mounted in the reverse order.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a dummy block for an extrusion press and an apparatus for replacing the same according to the present invention.

As shown in FIGS. 1 (1) and 1 (2), the dummy block 10 can be inserted into the billet loading hole 14 of the container 12, which closes the entrance of the billet loading hole 14 and , Is mounted on the distal end of the extrusion stem 18 via a closing plate 16 that supports the end face of the container 12. The closing plate 16 directly attached to the tip of the extrusion stem 18 is formed in a cylindrical dummy receiving block 20 having the same diameter as the dummy block 10 and in a semi-cylindrical shape on the rear outer peripheral surface of the dummy receiving block 20. The container support block 22 having a large diameter is integrally formed, and the loading hole 14 can be closed and sealed by partially inserting the dummy receiving block 20 into the billet loading hole 14 and abutting the end face of the container support block 22 with the container 12. Like that. The closing plate 16 transmits the extrusion pressure by fitting a half-ring projection 26 formed on the inner surface of the container support block 22 into a circumferential groove 24 formed on the extrusion stem 18.

The dummy block 10 is mounted on such a closing plate 16, particularly on the distal end surface of the dummy receiving block 20. The dummy block 10 is provided with a slide fitting portion 28 formed along the diameter line at the joint surface between the two. The dummy block 10 is attached through the intermediary. That is, a ridge 30 having a T-shaped cross section is formed on the tip end surface of the dummy receiving block 20 along the diameter line.
On the side, a T-shaped groove 32 that fits the T-shaped ridge 30 is formed. As a result, the dummy block 10 can be slidably moved in the lateral direction, that is, in the diameter line direction with respect to the closing plate 16, but is attached in the pushing direction with the movement restricted by the fitting portion 28 having a T-shaped cross section. It will be.
The fitting portion 28 having such a T-shaped cross section is separated by an insertion hole 34 of a mandrel (not shown) in the extrusion stem 18, but does not hinder the sliding movement of both.

FIG. 1C shows a slide fitting portion 28A according to another modification. This is the closing plate 16
An "ant" 36 is formed on the side, and an "ant groove" 38 is formed on the side of the dummy block 10, and the two are slidably fitted and connected. This also functions similarly. That is, the fitting protrusion and the fitting groove can be slid only in a direction orthogonal to the pushing direction. As long as the structure prevents movement and detachment in the extrusion direction, the projection cross-sectional shape can be set arbitrarily. Further, although the groove side is formed in the dummy block 10, the relationship between the two can be reversed.

FIGS. 2 and 3 show the configuration of a device for replacing the dummy block 10 thus configured. FIG. 2 is a front view showing the extrusion stem side, and FIG. 3 is a plan view. As shown in these figures, a traversing rail 40 is provided between the container 12 and the extrusion stem 18 so as to be orthogonal to the extrusion center line. The traversing rail 40 is provided with a traversing table 42 which is guided to travel. The traversing table 42 is connected to a traversing cylinder device 44 installed at one end of the rail of the extrusion press so as to be traversable. The table 42 can be moved under the extrusion press. Such a traversing table 42 is formed in a plane L-shape so that when the above-described dummy block 10 is moved to its standby position, it can be moved directly below the dummy block 10 by advancing the table. Is mounted with gripping arm means 46 capable of holding and holding the dummy block 10 by an opening / closing mechanism. This is a pair of arms 50R rotatably supported by a pair of parallel brackets 48 standing on the table 42,
50L, and these are driven up and down to open and close the legs, thereby causing the dummy block 10
Can be gripped from both sides. Arm 50
In order to open and close the R and 50L, pinion gears 52R and 52L are attached to these rotating shaft cores, respectively, and one of the pinion gears 52R has the same number of idle gears 5
2I is engaged. And the other pinion gear 5
Rack teeth 5 meshing with each of 2L and idle gear 52I
A rack plate 56 provided with 4R and 54L is slidably mounted on the table 42. Table 5
An opening / closing cylinder device 58 for driving the rack plate 56 back and forth is attached to the lower surface of the rack 2. Therefore, by moving the rack plate 56 back and forth by driving the opening / closing cylinder device 58 to extend and retract, the pinion gears 52R and 52L rotate, thereby causing the arms 50R and 50R to rotate.
L can open and close.

An engaging hole 60 is formed at the upper and lower positions on both sides of the dummy block 10, and the other arm 50
R and 50L have engaging projections 62 corresponding to the engaging holes 60, respectively.
Are provided so that the dummy block 10 can be securely held.

The dummy block 10 constructed as described above
, The dummy block 10 is fitted to the mandrel with the spigot even if one press is completed and the mandrel is returned to the standby position by returning the mandrel to the fixed position where the mandrel can be mated with the dummy block. Because it is supported by the joint, it is possible to enter the next press cycle as it is. Therefore, it is not necessary to replace the dummy block 10 every time. In a normal press cycle, the dummy block 10 is mounted on the closing plate 16 during the idle time in which the separation and removal of the discard and the die loading are performed after the press. After waiting and the next billet is loaded, the press cycle can be continued.

When replacement or maintenance of the dummy block 10 becomes necessary, the replacement is performed using the above-mentioned idle time by using the above-described replacement device. This switching device is used as follows. FIG. 4 shows a part of the pressing process of the extrusion press. Fig. 4 (1)
Has reached the extrusion limit. In this step, the mandrel 64 is retracted, and at the same time, the container stopper 66 is advanced. Next, the retraction operation of the extrusion stem causes the retraction of the dummy block 10 to start (FIG. 2 (2)), the dummy block 10 to the standby position, and the container 12 to the stopper 66.
(FIG. 3C). Thereafter, as shown in FIG. 4D, the discard 70 is cut by the shear 68. At this time, the traversing table 42 is moved to be disposed immediately below the dummy block 10 at the standby position, and the grip arm 50 is cut.
The legs R and 50L are driven to close, and the dummy block 10 is clamped. When the discarding of the discard 70 is completed, the traversing table 42 is retracted while holding the dummy block 10, and a new dummy block 10N is prepared and clamped again (FIG. 5 (5)). Next, the container stopper 66 is removed, the container 12 is further retracted, and the dies 72 are carried out by a loader (not shown). Then, the traversing table 42 is advanced, and as shown in FIG. 10N is attached to the closing plate 16.

As described above, in the embodiment, the dummy block 1
Since 0 is a semi-fixed type, a plurality of 0s can be continuously used. Then, by performing the retreating operation of the extrusion stem 18, the separating operation of the discard 70 and the dummy block 10 can be performed without requiring a special cutter or the like. Therefore, there is no disadvantage that the idle time is lengthened for separation as in the case where the free dummy block is used, and there is an advantage that the press cycle can be shortened. Then, the dummy block 10 is removed toward the press side off-line, and the mounting is also introduced from the side, so that the replacement work and the maintenance work of the dummy block 10 can be performed safely and easily. .

In the above embodiment, the traversing table 42 is run below the press. However, a rail may be provided above the press and the table may be run while hanging.

[0022]

As described above, according to the present invention, the dummy block can be used continuously for a plurality of presses, and the detachment / replacement / replacement of the dummy block can be performed simply by gripping and traversing the dummy block. Can be performed very easily, and the separation in the pushing direction is prevented in the mounted state, so that the discard can be easily separated, the replacement can be extremely easily performed, and the press cycle can be shortened. Excellent effects can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a dummy block according to an embodiment.

FIG. 2 is a front view of the dummy block replacement device of the embodiment.

FIG. 3 is a plan view of the exchange device.

FIG. 4 is an explanatory diagram of a dummy block replacement work process by the replacement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dummy block 12 Container 14 Billet loading hole 16 Closing plate 18 Extrusion stem 20 Dummy receiving block 22 Container support block 24 Circumferential groove (stem) 26 Half ring protrusion 28 Slide fitting part 30 T-shaped ridge 32 T-shaped groove 34 Mandrel Insertion hole 36 dovetail 38 dovetail groove 40 traverse rail 42 traverse table 44 traverse cylinder device 46 gripping arm means 48 parallel bracket 50R, 50L arm 52R, 52L pinion gear 52I idle gear 54R, 54L rack teeth 56 rack plate 58 open / close cylinder device 60 Hole 62 Engagement protrusion

Claims (2)

(57) [Claims] 1. A sliding fitting portion is formed along a direction perpendicular to the stem axis direction on a facing portion of a closing plate and a dummy block which is attached to a tip of an extrusion stem and abuts a billet loading port of a container. A dummy block for an indirect extrusion press, characterized in that it can be attached and detached by lateral movement. 2. A traversing table which is provided so as to be able to move in and out of a standby position of a dummy block attached to a tip of an extrusion stem, and wherein the dummy block is provided with respect to a closing plate which abuts a billet loading port of a container. The traversing table is slidably fitted along the moving direction of the traversing table and is detachably mounted. The traversing table is provided with gripping arm means capable of holding and holding the dummy block by an opening / closing mechanism. A dummy block exchange device for an indirect extrusion press, wherein a dummy block attached to a plate is detachably attached and exchangeable.