JP2579256B2 - Method and apparatus for replacing fixed dummy block in 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 method and an apparatus for exchanging a fixed dummy block in an extrusion press.
In particular, the present invention relates to a replacement method and apparatus having a structure suitable for replacement of a mandrel used for molding a hollow extruded product and a fixed dummy block integrally connected to the mandrel and a stem.

[0002]

2. Description of the Related Art When a hollow product is formed by an extrusion press, a mandrel is mounted on the tip of a stem driven by a ram cylinder, and this mandrel is connected to the stem via a fixed dummy block. . Such a mandrel or a fixed dummy block is appropriately replaced by a change in the specifications of a die or a container. This can be done by replacing only the mandrel (if the operator can hold it by hand) or only the fixed dummy block when the container liner diameter is changed when the mandrel is not attached. However, since the mandrel size is usually large and heavy, it is necessary to remove the fixed dummy block together with the mandrel from the stem and replace it.

Conventionally, in such an exchange work, in a case where the fixed dummy block and the stem have a screw fitting structure, a roller pedestal is arranged on the lower surface of the fixed dummy block integrated with the mandrel, and the roller pedestal is Preparatory work is carried out so as to be suspended by a crane or the like. Then, a rotation lever is mounted on the outer peripheral surface of the fixed dummy block by using the roller support, and is rotated so as to disengage the screw, and is detached from the stem. The removed mandrel and fixed dummy block are carried out to the side of the press by a crane. When installing a new dummy block, the same procedure is followed.Place it on the roller pedestal, transport it to the tip of the stem with a crane, and rotate the fixed dummy block side while centering with the stem By doing so, installation and replacement are performed.

[0004]

However, in the conventional replacement work, when the fixed dummy block is detached from the stem as described above, the roller pedestal and the like that holds and holds the fixed dummy block itself so that it can rotate can be used. There is a drawback in that the work efficiency is very poor because it has to be suspended and supported. In particular, since the mandrel and the fixed dummy block are in a heated state, there is a problem that the operation of directly rotating the dummy block side involves danger.

SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the above-mentioned conventional problems and to replace a fixed dummy block or the like in an extrusion press in which a replacement operation of a fixed dummy block with a mandrel can be automatically and safely and efficiently performed. It is to provide a method and an apparatus.

[0006]

In order to achieve the above object, a fixed dummy block for an extrusion press according to the present invention is provided.
Exchange method is attached to the extrusion press stem
A method of replacing a fixed dummy block , comprising:
A fixed dummy block is clamped and suspended and supported, and the fixed dummy block is stopped and held, and a rotationally fitted portion with the fixed dummy block on the stem side is rotated to remove and attach the rotationally fitted portion. The fixed dummy block was exchanged as intended.

Further, the extrusion press according to the present invention Fick
The replacement device for the dummy block is a replacement device for the fixed dummy block attached to the stem of the extrusion press, and can be traversed along a traversing guide rail laid toward the press side above the extrusion press. And a standby trolley on which the new and old fish dummy blocks enter and exit the lower part of the traverse guide rail at the side of the press, and the traverse gantry is provided along the axial direction of the extrusion press. to attach the front and rear movably supported movable platform, and the movable frame comprises a clamping means which enables sandwiched by the opening and closing operation fix dummy block and mandrel are detachably attached to the stem, Fick
Scan dummy block and on its clamping means to form an engaging portion of the detent, stearyl the fixed dummy block
And a means for rotating a screw shaft portion to be connected to the system.

[0008]

According to the above arrangement, when removing the fixed dummy block from the stem, the traversing platform is moved to a position just above the machine center of the press. At the time of movement, the clamp means of the movable base is evacuated so as not to interfere with the fixed dummy block or the like due to a leg opening operation or the like. And
When the clamping means reaches the center position of the press,
The fixed dummy block and the mandrel are sandwiched by the clamp means. At this time, the clamp means of the fixed dummy block is provided with a mechanism for preventing the rotation of the dummy block, so that the rotation of the fixed dummy block is prevented when the fixed dummy block connecting portion of the stem rotates. Therefore, by rotating the rotation fitting portion on the stem side, the rotational connection between the stem and the fixed dummy block can be released. Since the fixed dummy block and the mandrel are held by the clamping means, the movable gantry can be raised and moved in the lateral direction of the press by the operation of the traverse gantry. Place the removed fixed dummy block etc. on the bogie waiting in the side direction, clamp the new fixed dummy block and the mandrel, move this to the press side and perform the reverse operation, so that the stem Thus, a fixed dummy block with a mandrel can be rotationally coupled. This eliminates the need for manual work inside the press device, and allows the work to be performed safely and efficient replacement work can be performed. of course,
The fixed dummy block alone can be replaced by the same operation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Extrusion press fix according to the present invention is described below.
A specific embodiment of a method and an apparatus for replacing a dummy block will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 are schematic diagrams of a switching device according to an embodiment. As shown in these figures, a stem 14 is attached to the main crosshead 12 of the extrusion press 10, and a fixed dummy block 16 and a mandrel 18 are attached to and removed from the stem 14. The exchange device includes a mandrel 18 and a fixed dummy block 16 which are integrally connected by screws or the like.
Are provided at the same time, and are provided with a traversing guide rail 20 bridged between the machine center above the extrusion press 10 and a standby position provided on the side of the press 10.

The traversing guide rail 20 is constituted by parallel rails 20A and 20B which are supported by columns 22 erected on the side of the extrusion press 10 and reach the upper portion of the press 10. A traverse base 24 is attached to the traverse guide rail 20 so as to be able to travel. The traversing platform 24 is connected to a telescopic traversing cylinder mechanism 26 mounted along one rail 20A of the traversing guide rail 20, and driven by the cylinder mechanism 26 to the upper position of the press 10 from the side of the press 10. You can get in and out.

On the other hand, a running rail 28 parallel to the machine center is laid on the side of the extrusion press 10. This is installed below the traversing guide rail 20 and is arranged in a direction orthogonal to the traversing guide rail 20. The traveling rail 28 is used to move a standby trolley 30, and the standby trolley 30 mounts the fixed dummy block 16 with a mandrel to be replaced. The carriage 30 is connected to a drive cylinder mechanism 32 mounted along the traveling rail 28 so that it can enter and exit directly below the traversing guide rail 20.

The waiting trolley 30 is provided with a lifting pedestal 38 which is moved up and down by a lifting cylinder 36 on an upper part of the trolley body 34. The lifting pedestal 38 is provided with a seat 40 for the fixed dummy block 16 and a seat 42 for the mandrel 18. Both seats 40, 42 form a V-shaped seating surface to form the fixed dummy block 16 and an integral part thereof. The lower surface of the mandrel 18 is supported. In particular, the bearing 42 corresponding to the mandrel 18 has a variable bearing height by a height adjusting mechanism 44 so that a proper bearing can be performed even when the diameter of the mandrel 18 changes and the supporting height changes.

The above-mentioned traversing platform 24 is traversed by a traversing cylinder mechanism 26, which is driven to move between two positions between the machine center of the extrusion press 10 and the standby trolley 30. A movable frame 46 is attached to the traversing frame 24 so as to be movable back and forth along the axial direction of the extrusion press 10. FIG. 3 shows a specific structure of the movable base 46.

As shown in the figure, the movable gantry 46 is
4, and is slidably mounted in a direction orthogonal to the moving direction of the traversing platform 24, that is, in a direction along the machine center of the extrusion press 10. The movable gantry 46 includes a support frame 46A slidably mounted on the traversing gantry 24 and a gantry body 46B suspended and supported on the lower surface thereof. A bracket 48 is provided on the center upper surface of the support frame 46A, and the bracket 48 is connected to the bracket 52 by a rod 52 of a positioning cylinder 50 connected to one side edge frame of the traverse frame 24. Thus, the movable gantry 46 is moved in the axial direction of the press. Such a movable base 46 has fixed dummy blocks 16 to be replaced.
Clamping means 54F, 5
4M are mounted so that they can be co-axial with each other.

First, the clamp means 54F of the fixed dummy block 16 will be described with reference to FIGS. The clamping means 54F has a bracket 56 suspended from the lower surface of the gantry body 46B, and a pair of rotating shafts 58R,
58L is mounted in parallel with the press center. Each of the pivot shafts 58R and 58L has an open leg arm 60.
The base ends of R and 60L are fixed, and the opening and closing operations of the legs are performed by the rotation of the rotation shafts 58R and 58K. As shown in FIG. 4, a contact member 62 having a curved surface following the outer surface of the fixed dummy block 16 to be clamped is provided on the inner surface of the distal end portion of each of the open leg arms 60R and 60L. The contact member 62 is provided with the adjusting screw 6.
4 makes the amount of protrusion from the inner surface of the arm variable, and is adjusted so as to be in close contact with the fixed dummy block 16 appropriately (see the right arm 60R in FIG. 4). In the center of the contact member 62, a round bar-shaped projection 6 is fitted in a concave portion 66 for rotation operation formed of a long hole extending in the axial direction on the outer peripheral surface of the fixed dummy block 16.
8 is provided, and is always urged by the built-in spring 68 in the protruding direction. Therefore, the open leg arm 6
When the fixed dummy block 16 is crimped and clamped, the contact member 62 comes into close contact with the outer peripheral surface. As a result, the fixed dummy block 16 is prevented from rotating, and can be lifted.

A pair of cylinders 70R and 70L are attached to the bracket 56 to open and close the leg-opening arms 60R and 60L, and the rods are attached to the shaft ends of the rotating shafts 58R and 58L. And both are driven in synchronization with each other and the arms 60R, 60R
L is driven to open and close. A sensing lever 72 is provided on one of the rotation shafts 58L, and when the arm 60R, 60L reaches the leg opening limit, a limit switch 74 attached to the bracket 56 is activated to activate the cylinder 70R, 70L.
The operation stop signal to L is given.

On the other hand, the clamping means 54M for clamping the mandrel 18 will be described with reference to FIG. 3 and FIGS. The clamping means 54M is disposed on the front side of the gantry body 46B, and is mounted on an elevating frame 78 which can be moved up and down by an elevating cylinder 76 mounted on the gantry body 46B. That is, the gantry body 4
A pair of parallel elevating guide plates 80 hang down from the lower surface of 6B, and an elevating frame 78 is mounted between the plates 80 so as to be vertically movable. A linear guide 82 is provided on the inner surface of the plate 80 for ascending and descending guidance.

The lifting frame 78 is provided with roller clamps 84R and 84L that hold the mandrel 18 to be held in parallel from the side. The roller clamp 84 (84R, 84L) is a pair of upper and lower rollers 86
Are spaced apart in the axial direction and each clamp frame 88R, 8
8L are arranged in three rows, and clamp frames 88R,
Mandrel 1 by moving 88L closer to each other
8 at the same time in four places on the upper and lower side
Is rotatably held and liftable. In order to adjust the distance between the roller clamps 84, the clamp frames 88R and 88L are inserted through a pair of guide shafts 90 arranged perpendicular to the axial direction of the mandrel 18 so that the clamp frames 88R and 88L can move toward and away from each other. Have been.

On the other hand, for driving the roller clamps 84R and 84L, a pair of shafts 92R and 92L supported so as to be parallel to the mandrel 18 to be clamped are supported on the upper side of the lifting frame 78. Gears 94R and 94L meshing with each other are fixed to the shaft. A hydraulic cylinder 96 is connected to the shaft end of one shaft 92L via a crank member. The hydraulic cylinder 96 is driven to expand and contract to rotate the shaft 92L, and the other shaft 9L is driven through gears 94L and 94R.
2R is rotatable in the opposite direction. Further, each of the clamp frames 88R, 88L located on the lower surface side of the gears 94R, 94L and between the guide shafts 90.
Racks 98R and 98L meshing with the gears 94R and 94L are engraved on the upper surface of the gear. For this reason,
By driving the hydraulic cylinder 96, a gear 94 having a pair of drive shafts 92R and 92L attached thereto is provided.
R and 94L are rotated in opposite directions by engagement with each other, and at the same time, a pair of roller clamps 84R and 84L are brought close to each other by engagement with the racks 98R and 98L,
Alternatively, it can be moved away.

The replacement work method by the replacement device configured as described above is performed as follows. First, the extrusion press 10
When the fixed dummy block 16 with the mandrel 18 attached to the stem 14 is removed, the traversing platform 24 is moved to a position immediately above the extrusion press 10 by the extension operation of the traversing cylinder mechanism 26. At this time, the movable platform 4
6, the open leg arms 60R and 60L are opened in the dummy block clamp means 54F, and the lifting frame 78 is raised to the upper limit in the mandrel clamp means 54M, so that the fixed dummy block 16 and the mandrel 18 attached to the stem 14 are fixed. To avoid interference.

After the pedestal 24 reaches the upper portion of the extrusion press 10, the air cylinders 70R and 70L of the dummy block clamping means 54F are driven to open the leg-opening arms 60R and 60R.
When the fixed dummy block 16 is clamped from both sides by the contact members 62 provided at the arm ends, the fixed dummy block 16 is simultaneously rotated as described below to form the outer surface of the fixed dummy block 16. The arm-side round bar-shaped fitting projection 68 is engaged with the concave portion 66 formed of a long hole extending in the axial direction. Since the elongated hole and the round bar are fitted, even if their positions are slightly shifted in the axial direction, they can be reliably engaged.

The fixed dummy block 16 is connected to the stem 1
In order to remove the rod from the stem 4, a rotating rod in the stem 14 having a screw shaft portion 100 at the distal end, which is screwed to the central shaft portion on the rear surface side of the fixed dummy block 16, is rotated, as shown in FIG. I do. That is, the rotating rod 102 is inserted into the inside of the stem 14 to form a double shaft structure, and the screw shaft portion 100 provided at the tip of the built-in rod 102 is projected from the tip of the stem 14. Then, the screw shaft portion 100 is screwed to the fixed dummy block 16 so as to be fixed to the stem 14. The built-in rod 102 is linked to a connecting rod 106 provided in the main crosshead 12 via a rotary joint 104, and the connecting rod 106 is connected to a chain 110 by a motor 108 installed above the main crosshead 12.
It is to be rotationally driven by a rotational driving means including. Thus, rotation of the motor 108 is controlled by the chain 110,
The rotating rod 102 in the stem 14 can be rotated via the connecting rod 106, and the screw shaft 100 integrally attached to the distal end can be rotated. Therefore, the fixed dummy block 16 integrated with the stem 14 is rotated by rotating the built-in rod of the stem 14.

In parallel with the clamping operation by the dummy block clamping means 54F, the mandrel 18 is also held by the mandrel clamping means 54M. This lowers the elevating frame 78 and the roller clamp 84.
R, 84L is located on the side of the mandrel 18. Then, the hydraulic cylinder 96 is extended, and the drive shaft 92R,
92L is simultaneously rotated in the opposite direction using the meshing of the gears 94R and 94L, and the gears 94R and 94L are rotated simultaneously.
L engaged with each of the clamp frames 88R, 8
The pair of roller clamps 84R, 84L is brought close to each other using the racks 98R, 98L on the 8L side. As a result, the mandrel 18 is held.

Thus, the clamping means 54F, 54
By M, the fixed dummy block 16 is the mandrel 1
And 8 together. Subsequently, in order to remove the fixed dummy block 16 from the stem 14, if the screw shaft portion 100 is rotated by driving the motor 108 installed on the upper portion of the main crosshead 12 as described above, the fixed dummy block 16 After a slight rotation, the fitting projection 68 on the arm side enters and engages with the concave portion 66 of the fixed dummy block, and thereafter, even if the screw shaft portion 100 continues to rotate, the fixed dummy block 16 does not rotate. In this state, the connection between the fixed dummy block 16 and the stem 14 is released. However, as described above, the rotation of the built-in rod 102 of the stem 14 by the rotary driving device causes the screw shaft portion 100 at the distal end to be fixed to the fixed dummy block. An operation is performed so that the screw connection with the block 16 is released. At this time, the positioning cylinder 50 mounted on the movable gantry 46 is driven synchronously so as to extend, and the movable gantry 46 moves along the machine center direction of the extrusion press 10. Therefore, with the screw release rotation of the screw shaft portion 100, the fixed dummy block 16 moves in the detaching direction together with the movable base 46, and the connection is released.

After the connection with the stem 14 is released in this way, the traversing platform 24 is moved along the guide rails 20 and retracted to the side of the extrusion press 10. Press 10
The waiting cart 30 is previously positioned below the guide rail 20 on the side of the fixed dummy block 16.
And the mandrel 18 are conveyed to a position directly above the carriage 30. Then, the elevating cylinder 36 is activated by the standby trolley 30,
The lifting pedestal 38 is raised, and the fixed dummy block 16 and the mandrel 18 are placed on the receivers 40 and 42 on the upper surface thereof, and the clamping by the clamping means 54R and 54L is released. As a result, the fixed dummy block 16 and the mandrel 18 are transferred to the carriage 30 and moved to another location.

Then, another carriage 30 on which the new fixed dummy block 16 and the mandrel 18 are mounted is moved to the lower part of the traversing stand 24, and the lifting pedestal 38 is similarly raised, and the clamping means 54R and 54L are operated to clamp the carriage. Then, it moves toward the extrusion press 10 side, and performs the reverse operation to the above operation to mount and connect the new fixed dummy block 16 and the mandrel 18 to the stem 14.
This completes the replacement operation.

As described above, according to this embodiment, when the fixed dummy block 16 and the mandrel 18 are exchanged,
Since the worker does not enter the inside of the extrusion press 10, it is not only safe, but also it is possible to eliminate the human work in the replacement work and realize the automatic replacement work, so that the replacement work is very efficient.

In the above-described embodiment, when the fixed dummy block 16 is clamped by the dummy block clamping means 54F, the rotation is prevented by fitting the elongated recessed portion 66 formed in the dummy block 16 with the projection 68 on the clamp side. However, this may be configured as shown in FIG. The cross-sectional shape of the fixed dummy block 16 is quadrangular (FIG. 1 (1)) or hexagonal (FIG. 2 (2),
(3)) chamfered portions 112 on the outer peripheral surface so as to form a polygon such as
Is formed, and the clamp arms 60R and 60L are configured to clamp the chamfered portion 112 from both sides by surface contact. This makes it possible to attach and detach the dummy block 16 to and from the stem 14 while preventing the rotation of the dummy block 16.
The lower ends of the clamp arms 60R and 60L are bent so that the dummy blocks 16 can be held.

In the above-described embodiment, an example in which the connecting structure of the stem 14 and the fixed dummy block 16 is performed by screw fitting has been described. However, the present invention can be applied to a structure in which the connecting is performed by a bayonet mechanism. FIG. 10 shows a connection structure of the stem 14 and the fixed dummy block 16 by the bayonet mechanism. A spline shaft 114 is attached to the tip of the rotating rod 102 built in the stem 14,
On the other hand, a mounting hole 118 having a spline groove 116 formed on the entrance side is provided on the dummy block 16 side. The inside of the mounting hole 118 is an enlarged diameter hole in which the spline shaft 114 can rotate, and the spline shaft 114 is prevented from coming off by rotating by a half pitch of the spline groove 116. Thus, the fixing dummy block 16 can be attached and detached by rotating the rotating rod 102 in the stem 14, so that the exchange operation can be easily performed by the above-described exchange device. The mandrel 18 is screw-fitted to the fixed dummy block 16. This is provided with a tapered flange 120 on the mandrel 18 side, and a countersunk hole 122 is formed in the dummy block 16 for positioning.

In the above embodiment, the mandrel 1
Although an example of the replacement operation of the fixed dummy block 16 in a state in which the fixed dummy blocks 8 are integrally attached is described, it goes without saying that the replacement can be performed only for the mandrel 18 or only the fixed dummy block 16.

[0032]

As described above, according to the present invention,
At the upper part of the extrusion press, a traversing platform that can be traversed along a traversing guide rail laid toward the press side, and a new and old fishing dummy block that enters and exits the lower part of the traversing guide rail at the side of the press A standby trolley to be mounted, and a movable gantry supported to be movable back and forth along the axial direction of the extrusion press on the traverse gantry,
And the movable pedestal is equipped with a fixed dummy block that is attached to and detached from the stem and a clamp means capable of holding the mandrel by opening and closing operations, and the fixed dummy block and the clamp means are formed with engaging portions for rotation prevention , Connect the fixed dummy block to the stem
And device structure provided with rotation means of the screw shaft portion, fixes
The dummy block is clamped to support it suspended, and the fixed dummy block is prevented from rotating and held, and the rotationally fitted portion with the fixed dummy block on the stem side is rotated to detach and attach the rotationally fitted portion. The method of replacing the fixed dummy block by using a fixed mandrel
The effect of automatically and safely and efficiently replacing the me block and the dummy block alone is obtained.

[Brief description of the drawings]

FIG. 1 is a front configuration diagram of an exchange device according to an embodiment.

FIG. 2 is a side view of the configuration of the apparatus.

FIG. 3 is a sectional view of a main part of the device.

FIG. 4 is a sectional view of a clamp means of the fixed dummy block.

FIG. 5 is a plan sectional view of the clamping means.

FIG. 6 is a side view of the mandrel clamping means.

FIG. 7 is a plan sectional view of the clamping means.

FIG. 8 is a cross-sectional view of a crosshead portion showing a rotation drive mechanism of the rod with a built-in stem.

FIG. 9 is an explanatory diagram of a modified configuration example of a fixed dummy block and its clamp means.

FIG. 10 is an explanatory diagram showing another example of a connection structure of a fixed dummy block to a stem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Extrusion press 14 Stem 16 Fixed dummy block 18 Mandrel 20 Traversing guide rail 24 Traversing pedestal 26 Traversing cylinder mechanism 30 Standing trolley 36 Elevating cylinder 38 Elevating pedestal 46 Movable gantry 50 Positioning cylinder 54F, 54M Clamping means 60R, 60L Open leg arm 66 Recess Part 68 Fitting protrusion 70R, 70L Cylinder 76 Elevating cylinder 78 Elevating frame 84R, 84L Roller clamp 96 Hydraulic cylinder

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Matsui 1980, Ogishi, Ogushi, Ube-shi, Ube-shi, Yamaguchi Ube Industries, Ltd. Ube Machinery Works (56) References Japanese Utility Model No. 4-75603 (JP, U) Kaisho 60-157008 (JP, U)

Claims (2)

(57) [Claims] 1. A full attached to the extrusion press the stem
A method for replacing a dummy block, the method comprising:
The clamp dummy block is clamped and suspended, and the fixed dummy block is prevented from rotating and held, and the rotationally fitted portion of the stem with the fixed dummy block is rotated to attach and detach the rotationally fitted portion. the aim of the extrusion press fix dummy Bro, characterized in that forming the replacement fix dummy block
How to change the pocket . 2. A full attached to the extrusion press the stem
A cross dummy block exchange device , a traversing platform that can be traversed along a traversing guide rail laid toward the side of the press at the top of the extrusion press,
And a standby cart on which the new and old fish dummy blocks enter and exit from the lower part of the traverse guide rail on the side of the press, and are supported on the traverse base so as to be able to move back and forth along the axial direction of the extrusion press. The movable base is attached, and the movable base includes a fixed dummy block detachably attached to the stem and a clamp means capable of holding a mandrel by opening and closing operations. The fixed dummy block and the clamp means are engaged for rotation prevention. Form a part ,
Screw for connecting the fixed dummy block to the stem
A replacement device for a fixed dummy block in an extrusion press, wherein a rotating means for a shaft portion is provided .