JP3336863B2 - Power supply device and power supply method for die warming heater of 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 an extrusion press for obtaining a product by extruding a billet of aluminum or the like from a hole of a die. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device and a power supply method for a die warming heater of an extrusion press, which are movable between an extrusion position and an external position while being fixedly connected to a cassette so as not to be detachable.

[0002]

2. Description of the Related Art Conventionally, an extrusion press pushes a metal billet made of aluminum or the like held in an inner hole of a container by an extrusion stem, and presses a die held by a die cassette provided between the container and an end platen. The product is obtained by extruding through a hole, and when the dimensions of the product change, the die slide holding the die cassette is moved so that the die cassette moves between the outside standby position and the inside standby position. In the standby position outside the machine, the used die is exchanged with the die cassette, and the next die supplied to the die block and the die cassette holding the same are moved to the extrusion position to resume the extrusion operation. I have.

In this type of extrusion press, if the extrusion is performed in a state where the temperature of the die is lowered, the precision of the product is deteriorated, and not only a high quality product is not obtained, but also
Since an extra force is required for the extrusion stem, a device for heating the die directly or through a die cassette to keep the temperature has been conventionally provided. There are two methods for connecting a power supply cable to such a heating / heating device, a method using a manual attachment / detachment method and a method using an automatic attachment / detachment method. In particular, in the case of automatic attachment / detachment, for example,
As disclosed in Japanese Patent Application Publication No. 15, a die block supported by a die slide and holding a dice via a die cassette is moved between an outside standby position and an inside standby position to exchange the dice. The heater includes a heater buried in the die block near the die cassette, and a plurality of movable couplers connected to the heater and supported by the die block.
A fixed coupler that is connected to a power source and arranged near the outside position of the die block and near the in-machine use position in correspondence with the moving position of each movable coupler, and is driven forward and backward by a driving device to be connected to each movable coupler. Is provided.

[0004]

However, the manual attaching / detaching method is generally used when the capacity of the heater for heating the die is small and the power supply cable is thin. When the frequency of replacement increases, the frequency of connection with the connection portion of the power supply cable increases, which is not practical. On the other hand, in the automatic power supply attaching / detaching method, since the attaching / detaching device itself becomes large and takes up space, it is difficult for the operator to approach the die cassette and the workability is poor. There is a problem that it is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to use a die cassette in an outside position and inside a machine while a power supply cable for heating and keeping the die cassette connected to the die cassette. An object of the present invention is to provide a power supply device and a power supply method for a die warming heater of an extrusion press, which are provided so as to be movable between positions and can minimize a temperature drop.

[0006]

In order to achieve the above object, according to a first aspect of the present invention, a die slide is advanced and retracted, and a die cassette supported by the die slide and holding a die is arranged in tandem. An extrusion press equipped with a die exchanging device which is moved between an outside standby position and an in-machine use position so that only the dice can be exchanged, and a heater embedded in the die cassette and connected to the heater. A cylinder that is supported by the die cassette and that has a non-detachable connection part between the die cassette and the power supply cable, and that extends and contracts in the axial direction of the die exchange device at the side of the die exchange device. Connect the ends of the rope wound by the rope winder between the tip of the piston rod of the device and the power supply cable wired in a slack state. And freely feeding cable stretching between the outside waiting position and machine use position bets. Further, in the second invention, the die slide is moved forward and backward, the die cassettes supported by the die slide and holding the dice are arranged in tandem, and are moved between the outside standby position and the in-machine use position so that only the dice are moved. Using an extrusion press equipped with a replaceable die exchange device, a heater embedded in the die cassette,
The die cassette is connected to the heater and supported by the die cassette, and the connection between the die cassette and the power supply cable is made non-detachable, and the dies are placed on the die cassette in a standby position outside the machine. When moving from the in-machine use position to the out-of-machine standby position, the piston rod of the cylinder device is extended when moving from the in-machine use position to the standby position. In this case, the piston rod of the cylinder device is retracted, and the power supply cable is changed from the extended state to the loosened state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a power supply device and a power supply method for a die heating heater of an extrusion press according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a front view of the container according to the present invention when viewed from the end platen side, FIG. 2 is a longitudinal sectional view along the extrusion direction of an extrusion press, and FIG. FIG. 4 is a schematic side view of a die exchanging device, FIG. 5 is a front view of a die provided with a power supply device for a die heating heater, and FIG. 6 is an extended state of a power supply cable when the die is at a center position for pushing. FIG. 7 is a cross-sectional view of a cylinder device for preventing the power supply cable from being entangled, FIG. 8 is a side view of FIG. 7, and FIG. 9 is a side view of a die cassette vertically arranged on the die exchanging device. 10 to 19 are explanatory diagrams showing states of the power supply cable at the time of die exchange.

As shown in FIG. 2, the extrusion press 1 has a cylinder platen 3 and an end platen 4 erected on a bed 2 so as to face each other. Are connected by A main cylinder 8, which is supported by a support base 6 and has a rear end connected to a tank 7a by a pipe 7 or a valve, is fixed to the cylinder platen 3. The main cylinder 8 is provided in the main cylinder 8 so as to be able to move forward and backward. A main ram (not shown) has an extruding stem 9 which moves in the axial direction by hydraulic pressure supplied to the main cylinder 8.
Are connected via a crosshead 10.

Reference numeral 11 denotes both platens 3, 4
A container disposed closer to the end platen 4 between the container 11 and the cylinder platen 3 between the container 11 and the cylinder platen 3. Near the container, a billet loader 12 is provided movably between the paper back side and the near side in the figure. The billet 13 gripped by the billet loader 12 at the position outside the machine is configured to be supplied to the inner hole of the container 11 by moving the billet loader 12 to the illustrated position and advancing the extrusion stem 9. ing.

A dice device is provided between the container 11 and the end platen 4. That is, as shown in FIG. 1, a slide cylinder 20 is horizontally fixed to the right end when viewed from the container 11 side, and the working end of the piston rod 21 is perpendicular to the billet pushing direction. The die slide 22 formed so as to be able to advance and retreat on the guide 23 in the direction in which it moves is fixed.

Reference numeral 24 denotes a U-shaped die cassette which is open upward. A groove 24a for detachably engaging a projection 22a on the die slide 22 side is provided on the die slide 22 side end surface. And slide cylinder 2
In addition, the die cassette 24 is configured to move forward and backward integrally with the die slide 22 by moving the piston rod 21 of “0” forward and backward, and the die cassette 24 is moved to the die slide 22 by engagement of the projection 22a and the groove 24a. On the other hand, it is configured to be able to move in the axial direction and be separated.

As shown in FIGS. 1 and 3, a die 26 having an extrusion hole 26a for extruding the billet 13 compressed by the extrusion stem 9 is fitted into the U-shaped hole 24b of the die cassette 24. Reference numeral 25b denotes a bracket for suspending the die 26 with a hoist or the like. Further, a plurality of heaters 29 are embedded in the inner peripheral portion of the die cassette 24 near the outer peripheral portion of the die 26, and these heaters 29 are located on the left side of the die cassette 24 as shown in FIG. The power supply cable 32 is connected to the connection part 30 disposed in the power supply cable 32 so as not to be detachable. In FIG. 1, another die cassette 24A mounted on the die exchanging device 15 also has
Similar to the above-described die cassette 24, it is irremovably connected to the connection portion 31A by a power supply cable 33A on the left side of the drawing of FIG.

Further, as shown in FIG.
4, a die cassette front-rear cylinder 65 is horizontally supported via a bracket 66 below the outside-standby position of the machine, and a pair of front and rear trays 68, 69 are horizontally supported via a support member 70, and each tray 68,
The die cassette 24 is configured so as to be placed on the top 69 with its movement restricted by the projection 71.

As shown in FIG. 2, reference numeral 72 denotes a shear lifting / lowering cylinder which is located above the die cassette 24 at the in-machine use position and is supported on the machine base side. The blade 74 is fixed,
When the shear blade 74 descends, the discard as extruded residue projecting from the extrusion hole 26a of the die 26 is sheared.

According to the present invention, a plurality of heaters 29 are provided on the inner periphery of each die cassette 24, 24A.
The heater 29 is buried in the vicinity of the outer peripheral portion thereof, and power is appropriately supplied to these heaters 29 from power supply cables 32 and 32A. As shown in FIG.
5, two columns 35, 35 </ b> A are provided upright. In addition, power supply cable cylinder devices 36 and 36A are disposed at the upper end of the support column 35 in the same direction as the product pushing direction.

The power supply cable cylinder devices 36, 3
6A is a cylinder 37, as shown in FIGS.
37A, piston rod 38, 38A, guide rod 3
9, 39A and guide bushes 40, 40A. First, the power supply cable cylinder device 36 (36A) is representative of the case where power is supplied to the heater 29 embedded in the die cassette 24 among the die cassettes 24A and 24.
The power feeding cable cylinder device 36 (36A) is disposed at the upper end of the support 35 (35A) in the same direction as the pushing direction and horizontally, and the piston 37a ( 37b) is provided.

The cylinder 37 (37A), the piston rod 38 (38A) and the guide rod 39
(39A) is configured to be on a straight line. A piston rod 38 (38) is attached to the piston 37a (37b).
A) is fixed to one end of the piston rod 38 (38).
The other end of A) is fixed to the end of the guide rod 39 (39A). Although not shown, the cylinder 37
Pneumatic supply / discharge ports are provided in the front and rear portions of (37A).
b) can be moved forward and backward. And, before and after the piston 37a (37b), the guide rod 39
Guide rod 39 (39A) so that (39A) can be moved linearly
Hollow cylindrical bush 40 (40A)
The guide rod 39 (39A) can move forward and backward while being guided by the hollow cylindrical bush 40 (40A).

On the other hand, the wiring of the power supply cable 32 (32A) will be described. A relay box 45 (45A) is provided in the middle of the upright support 35, and the relay box 45 (45A) is shown in the figure. A power supply cable is provided from a power supply omitting. Further, a power supply cable 32 (32A) is provided from the relay box 45 (45A) to the connection portion 30 (30A) of the die cassette 24 (24A) in a loosened state as shown in FIG. Then, as shown in FIG. 9, for example, the loosened state is such that the die cassette 24 (24A) is in the dice exchange position (standby position outside the machine).
Is most slack, and conversely, as shown in FIG.
The case where the die cassette 24 (24A) is at the center position of extrusion (in-machine use position) is in the most extended state.

A rope winder 46 (46A) is provided between the leading end of the guide rod 39 (39A) and the power supply cable 32 (32A), and the rope winder 46 (46A) is provided. Rope 47 (47
A) has one end connected to the tip of the guide rod 39 (39A), and the other end connected to the power supply cable 32 (32A).
It is tied in the middle of A). Then, the rope 47 (47A) wound by the rope winder 46 (46A)
Can be lengthened or shortened depending on whether or not the power supply cable 32 (32A) is loose.

That is, the die cassette 24 (24
As A) moves from the die exchange position (external stand-by position) to the extrusion center position (in-machine use position), the power supply cable 3
2 (32A) is no longer loose, and in this case the rope 47
(47A) is drawn out from the rope winder 46 (46A) so as to be longer. Conversely, as the die cassette 24 (24A) moves from the extrusion center position (in-machine use position) to the die exchange position (external stand-by position), the power supply cable 32 (32A) becomes slackened.
In this case, the rope 47 (47A) is connected to the rope winder 46.
(46A), and at the same time, it is configured to be able to prevent mutual entanglement caused by slack of the power supply cable 32 (32A).

Next, the operation of the power supply device for the die heating heater of the extrusion press configured as described above will be described.

First, when the billet 13 is conveyed by rotating the arm of the billet loader 12 while the container 11 is advancing to the illustrated position, the extruding stem 9 is advanced by the operation of the main ram 8. Since the billet 13 is pushed, the billet 13 is inserted into the inner hole of the container 11. When the extrusion stem 9 is further advanced, the billet 13 is compressed, and is extruded as a product from the extrusion hole 26 a of the die 26 into the hole of the end platen 4.

When the extrusion is completed, the container 11 retreats, and the discard as extruded cake projects from the rear end face of the container 11. In this state, the piston rod of the shear lifting / lowering cylinder 72 descends, and the shear blade 74 integrated therewith descends along the end surface of the die 26, and the discard is sheared from the boundary with the product. The sheared discard slides on the chute and is collected.

When the shear blade 74 is lowered to cut the discard from the product, the discard is taken out, and the product is pulled out in the extrusion direction and taken out. The end of the product is a die 2
6 and is conveyed by a puller (not shown). Thereafter, the shear blade 74 moves up.

The exchange operation of the die cassettes 24 and 24A when the specification of the product is changed is shown in FIGS.
9 will be described. In the following description, the positions at which the die cassettes 24 and 24A move are denoted by reference numerals as shown in FIGS.

That is, the in-machine use position where the extruding operation is performed is set as a position, and the slide cylinder 20
The position extruded to the outside of the machine is defined as the position. A position adjacent to this position in the extrusion direction is a position, and a position adjacent to the position in the anti-extrusion direction is a position.

First, the most characteristic feature of the present invention is that
Heater 2 disposed on the outer periphery of die cassettes 24 and 24A
9 is connected to the connecting portions 30 and 30A, and the power supply cables 32 and 32A for supplying power to the
A case will be described in which the dice 26 mounted on the die 4 at the outside standby position and the dice 26A mounted on the die cassette 24A at the in-machine use position are exchanged.

As shown in FIG. 10, dice 26 (A) and 2
6A (B), a die cassette 24 on which the next die 26 (A) is mounted is held at the standby position outside the machine, and the heater 29 is energized to preheat the next die cassette 24. I have. A die 26A (B) mounted on the die cassette 24A is located at the in-machine use position.

From the state shown in FIG. 10, the piston rod 67 of the die cassette front / rear cylinder 65 is extended, and the die cassette 24 is advanced to the outside standby position shown in FIG. 4 with the die 26 (A) mounted. (Figure 1
1). Next, with the piston rod of the slide cylinder 20 extended, the die cassette 24A is moved to the outside standby position where the die changing device 15 is provided with the dice 26A (B) being mounted, and the die cassette 24A is arranged in tandem on the die changing device 15. (FIG. 12).

When the piston rod 67 of the front / rear cylinder 65 is retracted from the state shown in FIG. 12, the die exchanging device 15 moves in the product pushing direction,
The die cassette 24A on which the die 26 is mounted becomes the standby position outside the machine, and at the same time, the die cassette 24 on which the die 26 is mounted is mounted.
Becomes the outside standby position (FIG. 13). Further, when the die cassette 24 on which the dies 26 are mounted is moved from the state of the outside standby position shown in FIG. 13 to the in-machine use position by retracting the piston rod 21 of the slide cylinder 20,
When air pressure is first introduced to the head side of the piston 37a of the cylinder 37, the guide rod 39 is guided by the bush 40 to move forward.

In the die cassette 24 on which the die 26 is mounted, the power supply cable 32 loosened during the movement from the standby position outside the machine to the use position inside the machine (the extrusion position of the billet 13 as a product via the die 26) gradually disappears. At the same time, the rope 47 is pulled out from the rope winding device 46 until the power supply cable 32 is extended.

Next, from the state shown in FIG. 14, power supply cables 32, 32A for supplying power to the heater 29 disposed on the outer periphery of the die cassettes 24, 24A are connected to the connecting portion 30,
A case will be described in which the dice 26A mounted on the die cassette 24A at the standby position outside the machine and the dice 26 mounted on the die cassette 24 at the in-machine use position while being connected to the die cassette 24A are exchanged.

As shown in FIG. 15, the dies 26 (A) and 2
6A (B), a die cassette 24A on which the next die 26A (B) is mounted is held at the standby position outside the machine, and the heater 29 is energized to preheat the next die cassette 24A. I have. The dice 26 (A) mounted on the die cassette 24 is located at the in-machine use position.

Next, while the piston rod 21 of the slide cylinder 20 is extended and the die 26 (A) is mounted, the die cassette 24 is advanced to the outside standby position shown in FIG. (FIG. 16). Continuously, cylinder 6 for die cassette front and rear
Dice changing device 1 by extending piston rod 67 of No. 5
5, the die cassette 24A with the dice 26A (B) mounted thereon and the die cassette 24 with the dice 26 (A) mounted thereon are moved to the outside standby position shown in FIG. 4 (FIG. 17).

From the state shown in FIG.
0 piston rod 21 is retracted and dies 26A
The die cassette 24A equipped with (B) is moved from the stand-by position outside the machine to the use position inside the machine (the billet 13 is a pushing position as a product via the die 26) (FIG. 18).

Subsequently, the cylinder 65 for the front and rear of the die cassette is used.
When the piston rod 67 is retracted, the dies 26
The die cassette 24 mounted with (A) moves from the outside standby position to the outside standby position and returns to the initial position (FIG. 19). FIG. 6 shows a detailed structure.

[0038]

As apparent from the above description, the present invention has the following advantages. In other words, the power supply to the heater provided in the die cassette was conventionally performed by manually detaching the plug and the socket, but the structure is simple by leaving the die cassette and the power supply cable connected. Moreover, it is safe, labor for manually attaching and detaching can be saved, and labor can be saved. Furthermore, no maintenance is required. Since the die cassette is continuously heated and kept warm without interruption, the temperature drop is small, the heat loss is small, and the thermal efficiency is improved. Furthermore, since the temperature of the die is likely to be uniform, a good extruded product is obtained, and the product yield is improved.

[Brief description of the drawings]

FIG. 1 is a front view of the container according to the present invention as viewed from the end platen side from the container side.

FIG. 2 is a longitudinal sectional view along an extrusion direction of an extrusion press.

FIG. 3 is a front view of the die cassette heat retaining device at a standby position outside the apparatus.

FIG. 4 is a schematic side view of a die changing device.

FIG. 5 is a front view of a dice provided with a power supply device for the dice warming heater.

FIG. 6 is a plan view showing an extended state of a power supply cable when a die is at a center position of extrusion.

FIG. 7 is a sectional view of a cylinder device for preventing a power supply cable from being entangled;

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a side view of a die cassette vertically arranged on a die changing device.

FIG. 10 is a view showing a state where the die A is in the outside standby position and the die B
FIG. 4 is an explanatory diagram showing a state of a power supply cable when is located at an in-machine use position.

FIG. 11 is an explanatory diagram showing an operation continued from FIG. 10;

FIG. 12 is an explanatory diagram showing an operation continued from FIG. 11;

FIG. 13 is an explanatory diagram showing an operation continued from FIG. 12;

FIG. 14 is an explanatory diagram showing an operation continued from FIG. 13;

FIG. 15 shows a die A in a state where the die B is at the outside standby position.
FIG. 4 is an explanatory diagram showing a state of a power supply cable when is located at an in-machine use position.

FIG. 16 is an explanatory diagram showing an operation continued from FIG. 15;

FIG. 17 is an explanatory diagram showing an operation continued from FIG. 16;

FIG. 18 is an explanatory diagram showing an operation continued from FIG. 17;

FIG. 19 is an explanatory diagram showing an operation continued from FIG. 18; DESCRIPTION OF SYMBOLS 1 Extrusion press 2 Head 3 Cylinder platen 4 End platen 5 Tie rod 6 Support stand 7 Piping 8 Main cylinder 9 Extrusion stem 10 Crosshead 11 Container 12 Billet loader 13 Billet 15 Dice exchange device 20 Slide cylinder 22 Die slide 23 Guide 24, 24A die Cassette 25b Gold hanging bracket 26, 26A Dice 26a Extrusion hole 29 Heater 30, 30A Connecting part 32, 32A Power supply cable 35, 35A Support 36, 36A Power supply cable cylinder device 37, 37A Cylinder 39, 39A Guide rod 40, 40A bush 45 , 45A relay box 46, 46A rope winding device 47, 47A rope 65 die cassette front and rear cylinder 67 piston rod 68, 69 tray 70 support member 71 Projection 72 Shear lifting cylinder 73 Holder 74 Shear blade

Claims (2)

(57) [Claims] 1. A die slide is moved forward and backward, and a die cassette supported by the die slide and holding a die is arranged in tandem and moved between an outside standby position and an in-machine use position so that only the die can be replaced. Extruder equipped with a die exchanging device, comprising: a heater embedded in the die cassette; a heater connected to the heater and supported by the die cassette; and a detachable connection between the die cassette and a power supply cable. A rope winding is provided between a tip end of a piston rod of a cylinder device which is located at a side of the die exchanging device and expands and contracts in an axial direction of the dice exchanging device, and a power supply cable wired in a loose state. The ends of the ropes wound around the container are connected to each other to make the power supply cable extendable between the stand-by position outside the machine and the in-machine use position of the die cassette. A power supply device for a die warming heater of an extrusion press. 2. The die slide is moved forward and backward, and a die cassette supported by the die slide and holding the dice is arranged in tandem, and is moved between an outside standby position and an in-machine use position so that only the dice can be replaced. Using an extrusion press equipped with a die changing device, a heater embedded in the die cassette, the heater connected to the heater and supported by the die cassette, and a connecting portion between the die cassette and a power supply cable are not detachably attached. When moving the dies from the stand-by position outside the machine to the in-machine use position with the dies placed on the die cassette, the piston rod of the cylinder device is extended and the power supply wired in a loose state When the cable is extended, the piston rod of the cylinder device is retracted when moving from the inside use position to the outside stand-by position. A method for supplying power to a die warming heater of an extrusion press, wherein the power supply cable is changed from an extended state to a loosened state.