JP2566491B2 - Extrusion press die block heat retaining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is an extrusion press for extruding a billet of aluminum or the like from a hole of a die to obtain a product. The present invention relates to a die block heat retaining device of an extrusion press that heats a die block that moves between them to keep it warm.

[Conventional technology]

The extrusion press pushes a metal billet such as aluminum held in the inner hole of the container with an extrusion stem, and extrudes through a hole of a die held in a die block of a die changer provided between the container and the end platen. If you get the product and the dimensions of the product change,
Move the die slide that holds the die block back and forth so that the die block moves between the outside standby position and the in-machine use position, and replace the used die with the die cassette at the outside standby position and supply it to the die block. The next die and the die cassette holding the die are moved to the extrusion position to restart the extrusion operation.

In this type of extrusion press, if extrusion is carried out with the temperature of the die lowered, not only the quality of the product will deteriorate, but it will not be possible to obtain a good quality product, but also extra force will be required on the extrusion stem. Therefore, a device for heating the die directly or through a die block to keep it warm is conventionally provided. This heat retaining device is, for example, as disclosed in Japanese Patent Laid-Open No. 64-5622, a heating furnace is provided in the vicinity of the die located outside the machine, and the next die to be replaced with a used die and this The die cassette holding the is heated in the heating furnace, and the preheated die and the die cassette are supplied to the die block which has moved to the position outside the machine. Further, a heater for heating the supplied die block to keep it warm is embedded in the die block.

[Problems to be Solved by the Invention]

However, in such a conventional heat retaining device, since the die block is preheated in the heating furnace as described above, when the die block is supplied to the die slide or when the die block is supplied to the die slide, the standby state is held outside the machine. There is a problem that the temperature of the die and the die cassette holding the die is easily lowered during the operation, and a sufficient heat retaining effect cannot always be expected.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a die block heat retaining device for an extrusion press that can minimize a temperature decrease.

[Means for solving the problem]

In order to achieve such an object, in the present invention, a die block, which is supported by an advancing and retracting die slide and holds a die through a die cassette, is moved between an outside standby position and an in-machine use position to move the die. In an extrusion press equipped with a die exchanging device that exchanges with the die cassette, connect a plurality of movable couplers supported by the die block to the heater embedded in the die block close to the die cassette, and wait outside the die block. Fixed couplers, which are driven forward and backward by a drive device and are connected to the movable couplers, are provided near the position and in the vicinity of the in-machine use position, corresponding to the moving positions of the movable couplers.

[Work]

The product is obtained by extruding the billet supplied to the inner hole of the container through the extrusion hole of the die by advancing the extrusion stem. When the die specifications are changed and the dies are replaced, the fixed coupler is moved by the drive unit in the in-machine use position to release the connection with the movable coupler, and then the drive unit moves the die slide in the orthogonal direction to extrusion. The used die block to the empty standby position outside the machine. At the adjacent position in the extrusion direction of the used die block stopped at this time, the die block holding the next die cassette is prepared by being preheated by the connection of the movable coupler and the fixed coupler,
After releasing the connection between the movable coupler and the fixed coupler, the next die block is moved in the direction orthogonal to the extrusion by the driving device, the next die block is connected to the die slide, and the used die block is pushed out in the same direction. Be done. At this time, if there is a coupler at the stop position of the next die block, the coupler is connected to heat and keep the die block warm. Next, when the die cassette is moved by the driving device, the next die block moves to the in-machine use position, so that the movable coupler and the fixed coupler are connected to restart the extrusion operation.

During the extrusion operation, a set of die blocks in the standby position outside the machine and an empty tray are moved in the direction orthogonal to the extrusion direction to remove the used die block outside the machine and the next die block to the empty tray. It is mounted on top and when necessary, the movable coupler and fixed coupler are connected to start preheating.

〔Example〕

1 to 6 show an embodiment of a die block heat retaining device of an extrusion press according to the present invention. FIG. 1 is a front view of the die block and the die block heat retaining device at a standby position outside the machine, and FIG. 1 is a side view of FIG. 1 viewed from II, and FIG.
III is a plan view, FIG. 4 is a schematic front view of a die block and a die cassette, FIG. 5 is a schematic side view of the same, and FIG. 6 is a schematic front view of the entire extrusion press.

As shown in FIG. 6, the extrusion press 1 is provided with a cylinder platen 3 and an end platen 4 which are erected on the bed 2 so as to be opposed to each other. These platens 3 and 4 are connected at their four corners by tie rods 5. Has been done.

The cylinder platen 3 has a main cylinder 8 which is supported by a support 6 and whose rear end is connected to the tank 7a by a pipe 7 and a valve.
Is fixed to the main ram 8a provided in the main cylinder 8 so as to be able to move forward and backward, and an extrusion stem 9 that advances and retracts in the axial direction by a hydraulic pressure supplied to the main cylinder 8 via a crosshead 10. Are linked together. The reference numeral 11 in the figure denotes a container disposed near the end platen 4 between the platens 3 and 4, and is configured to move forward and backward in the axial direction on the rail by a hydraulic cylinder (not shown). There is a billet loader near the container 11 between the container 11 and the cylinder platen 3.
12 is movably provided between the back side and the front side of the figure. The billet 13 gripped by the billet loader 12 at the outboard position 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 die device is provided between the container 11 and the end platen 4. That is, as shown in FIG. 4, at the left end when viewed from the container 11 side,
A slide cylinder 20 is fixed horizontally, and a die slide 22 formed so as to be able to move forward and backward on a guide 23 in a direction orthogonal to the billet pushing direction is fixed to the working end of a piston rod 21 thereof. 24 is U that opens upward
A die block formed in a character shape, the end surface of the die slide 22 side is provided with a groove 24a for detachably engaging the protrusion 22a of the die slide 22 side, and the piston rod 21 of the slide cylinder 20. By moving back and forth,
The die block 24 is configured to advance and retreat together with the die slide 22, and the die block 24 is
The protrusion 22a and the groove 24a are engaged with each other to move in the axial direction with respect to the tie slide 22 so as to be a separate body. As shown in FIGS. 1 and 4, the die block 24
The U-shaped hole 24b of the die cassette 25 has a die hole 25a.
Is removably fitted in the die hole 25a,
Extrusion hole 26 for extruding the billet 13 compressed by the extrusion stem 9.
A die 26 having a is fitted. Reference numeral 27 is a pair of covers that rotate about the pin 28 to open and close the upper end opening of the U-shaped hole 24b. Further, 25b is a metal fitting for hanging the die block 25 with a hoist or the like.

Further, a plurality of heaters 29 are embedded in the inner peripheral portion of the die block 24 in close proximity to the outer peripheral portion of the die cassette 25, and these heaters 29 are movable couplers 30, 31 that move together with the die block 24. Is connected with a lead wire.

Further, as shown in FIG. 2, a fixed coupler 32 connected to the power source side by a lead wire (not shown) is provided on the end platen 4 side above the movable coupler 30 stopped at the in-machine use position. It is supported via the bracket 33 and the like.
The movable coupler 30 includes an L-shaped bracket 34 fixed to the stepwise die block 24, and a pair of heater power source socket 35 and thermocouple socket 36 fixedly supported by the L-shaped bracket 34. A U-shaped guide plate 37 for positioning and a centering pin socket 38 are fixed to both ends of the bracket 34. On the other hand, since the fixed coupler 32 corresponding to the movable coupler 30 is driven up and down by a driving device, this driving device will be described first. That is, a lifting bracket 40 and a pair of guide sockets 41 are provided upright on a horizontal bracket 39 which is fixed to the vertical surface of the end platen 4, and the bracket 33 acts on the piston rod 42 of the lifting cylinder 40. It is fixed to the end and the lower end of a guide rod 43 fitted in the inner hole of the guide socket 41 so as to be able to move up and down. The lower horizontal member 44 of the bracket 33 that is moved up and down by the lifting cylinder 40 has a heater power supply plug 45 and a thermocouple plug 46 that are removably fitted to the pair of heater power supply sockets 35 and thermocouple sockets 36, respectively. Is fixed, and the U-shaped guide plate 37 and the centering pin socket 38, which are respectively fitted into the U-shaped guide plate 37 and the centering pin socket 38, are fixed. By doing so, the piston rod 42 of the lifting cylinder 40 is lowered and the lower horizontal member 44 is guided by the guide rod.
When it descends while being guided by 43, the sockets 35 and 36 and the plugs 45 and 46 are fitted to each other to energize the thermocouple and the heat 29, and the pin socket 38 and the pin 48 are engaged with each other and the core not shown. The die 26 is configured to be centered in cooperation with the delivery roller. The second
The movable coupler 30 is also provided in each of the die blocks shown in the standby position outside the machine in FIGS.

As shown in FIG. 1 and FIG. 3, the movable coupler 31 has a U-shaped bracket 50 fixed to the side surface of the die block 24.
And a pair of heater power supply sockets fixedly supported by this
51 and a thermocouple socket 52, and centering pin sockets 53 are fixed to both ends of the bracket 50. On the other hand, brackets 56 are respectively erected on a pair of support bases 55 fixed to the bed 54 on the machine base side, and a drive cylinder 57 and a pair of guide sockets 58 are provided on the outer surface of the bracket 56. The bracket 59 is fixed to the working end of the piston rod of the drive cylinder 57,
It is fixed to the end of a guide rod 60 fitted in the inner hole of the guide socket 58 so as to be able to move forward and backward. A heater power supply plug 62 and a thermocouple plug 63, which are removably fitted to the pair of heater power supply socket 51 and thermocouple socket 52, are fixed to a support plate 61 of a bracket 59 that moves forward and backward by a drive cylinder 57. Further, the centering pin 64, which is fitted into the centering pin socket 53 so as to be freely inserted and removed, is fixed. By doing so, when the piston rod of the drive cylinder 57 moves forward and the support plate 61 moves forward while being guided by the guide rod 60, the sockets 51, 52 and the plugs 62, 63 are fitted to each other, and the thermocouple and the heater 29. It is configured such that current is supplied to and the pin socket 58 and the pin 60 are engaged with each other for accurate fitting.

Further, as shown in FIG. 5, a die block front and rear cylinder 65 is horizontally supported via a bracket 66 below the outside standby position of the die block 24. A pair of front and rear trays 68, 69 are horizontally supported by the piston rod 67 via a supporting member 70, and the die block 24 is mounted on each tray 68, 69.
Is configured to be placed with its movement restricted by the protrusion 71.

As shown in FIG. 2, 72 is a shear lifting cylinder located above the die block 24 at the in-machine use position and supported on the machine base side. 74 is fixed and this shear 74
Is lowered so that the discard as an extrusion meal protruding from the extrusion hole 26a of the die 26 is sheared.

The operation of the extrusion press configured as above will be described. When the container 11 is advanced to the position shown in the figure, the arm of the billet loader 12 rotates so that the billet 13
When the billet 13 is conveyed, the pushing stem 9 advances by the operation of the main ram 8 and pushes the billet 13, so that 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 extruded as a product from the extrusion hole 26a of the die 26 into the hole of the end platen 4. When the extrusion is completed, the container 11 retracts,
A discard as an extrusion meal projects from the rear end surface of the container 11. In this state, the piston rod of the shear lifting cylinder 70 descends and the shear 72 integrated with this is die-blocked.
It descends along the end face of 26 and the discard is sheared from the boundary with the product. The sheared discard is slid on the chute and collected.

When the shear 72 descends and disconnects the discard from the product, the discard is taken out and the product is pulled out in the extrusion direction. The rear end of the product comes out of the extrusion hole 25a of the die 26 and is conveyed by a puller (not shown). after this,
Shear 72 rises.

Therefore, the replacement operation of the die cassette 25 when the product specifications change will be described. In the following description, the die cassette 25 is moved to four positions, as shown in FIGS.
Use the symbols as shown in the figure. That is, the in-machine use position where the pushing operation is performed is the A position, and the position pushed out of the machine by the slide cylinder 20 from this position is the B position. Further, a position adjacent to the B position in the extrusion direction is defined as a C position, and a position adjacent to the B position in the opposite extrusion direction is defined as a D position.

Prior to the replacement of the die cassette 25, the die lock 24 for holding the next die cassette 25 is placed at the position C, and the plugs 62, 63 and the sockets 51, 52 are connected by the operation of the drive cylinder 57. Therefore, the heater 29 is energized and the next die block 24 is preheated. The die block 24 is not placed at the position B, and only the tray 68 is located. Also, during the extrusion operation, the piston rod 42 of the lifting cylinder 40 is lowered and the plugs 45 and 46 and the socket 3
Since 5,36 are connected and the die cassette 25 is heated, the temperature does not decrease.

When the extrusion work is completed, the piston rod of the lifting cylinder 40
When the piston 42 of the slide cylinder 20 is moved forward after the couplers 45, 46 are disengaged from the couplers 45, 46 and the sockets 35, 36, the die block 24 is moved from the A position to the B position via the die slide 22. It moves, is placed on the empty tray 68, and stops.

Therefore, when the piston rod of the drive cylinder 57 in the C position is retracted, the connection between the plugs 62 and 63 and the sockets 51 and 52 is released, so that the piston rod of the drive cylinder 65 is released.
When 67 is moved forward, the die block 24 at the C position is moved to the B position and stopped with the projection 22a of the die slide 22 being engaged with the groove 24a, and the used die block 24 at the B position is stopped. Moves to position D and stops.

Then, the drive cylinder 57 is operated to connect the plugs 62 and 63 and the sockets 51 and 52, and the die block 2 at the B position
After heating 4 for a predetermined time, the drive cylinder 57 is operated to disconnect the plugs 62, 63 and the sockets 51, 52.

Then, when the piston rod 21 of the slide cylinder 20 is retracted, the die slider 22 moves and the groove 24a and the protrusion 22a are moved.
Due to the engagement of and, the redie block 24 also moves and stops at the position A. Therefore, when the elevating cylinder is operated to engage the plugs 45 and 46, the die block 24 is heated and kept warm, so that the extrusion operation is restarted.

During the extrusion operation, after removing the used die block 24 at the D position with a hoist or the like, when the piston rod 67 of the slide cylinder 65 is retracted, the tray 68 moves to the B position and the tray 69 moves to the C position. Then, the state shown in FIG. 5 is reached, so that the next die block 24 is placed on the tray 69 before changing to the next product, and preheating is started as described above.

In this way, the die block 24 is heated at the A, B, and C3 positions, so that it is not cooled and the heat retention state is maintained.

In this embodiment, the heat insulating device for the die block is A, B,
Although the example provided at the C3 position is shown, this heat retaining device does not necessarily have to be provided at the B position.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the die block, which is supported by the die slide advancing and retracting and holds the die via the die cassette, is moved between the outside standby position and the in-machine use position to move the die. In an extrusion press equipped with a die changing device that exchanges with the die cassette,
Connect a plurality of movable couplers supported by the die block to the heater embedded in the die block close to the die cassette, and move each of these movable couplers near the die block standby position outside the machine and near the in-machine use position. By arranging a fixed coupler that corresponds to each position and is driven forward and backward by a drive unit and connected to each movable coupler, the die block is heated and kept warm without interruption not only in the in-machine use position but also in the outside standby position. As a result, the temperature drop is small, the thermal efficiency is improved, and a good quality product is obtained. In addition, since the extrusion stem does not require extra force, power can be reduced.

[Brief description of drawings]

1 to 6 show an embodiment of a die block heat retaining device of an extrusion press according to the present invention. FIG. 1 is a front view of the die block and the die block heat retaining device at a standby position outside the machine, and FIG. FIG. 1 is a side view taken along the line II, and FIG.
FIG. 4 is a schematic front view of the die block and die cassette, FIG. 5 is a schematic side view of the same, and FIG. 6 is a schematic front view of the entire extrusion press. 1 ... Extrusion press, 4 ... End platen, 22 ... Die slide, 24 ... Die block, 25 ... Die cassette,
26 …… Dice, 29 …… Heater, 30,31 …… Movable coupler, 3
2 …… Fixed coupler, 40 …… Lifting cylinder, 35, 36, 51, 52…
… Sockets, 45,46,62,63 …… Plugs, 57 …… Drive cylinders, 65 …… Front and rear cylinders.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Iwashita 6-224, Kaiyama-cho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd. Ube Machinery Co., Ltd.

Claims (1)

(57) [Claims] 1. A die block is moved together with a die cassette by advancing and retracting the die slide and moving a die block supported by the die slide and holding the die via a die cassette between an outside standby position and an in-machine use position. In an extrusion press equipped with a die exchanging device for exchanging, a heater embedded in the die block in proximity to the die cassette,
A plurality of movable couplers connected to the heater and supported by the die block, and moving positions of the movable couplers near the outside standby position and in-machine use position of the die block connected to the power source, respectively. A die block heat retaining device for an extrusion press, which is provided with a fixed coupler that is arranged correspondingly and is driven by a driving device to move forward and backward and is connected to each of the movable couplers.