JP3134777B2 - Extrusion press equipment for short stroke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-stroke extrusion press device, and more particularly to a structure capable of loading short and long billets, shortening the machine length and idle time, and transferring a billet from a billet carrier to a billet holding portion of a billet loader. The present invention relates to a short-stroke extrusion press apparatus that performs billet loading under a work floor, and then transfers and supplies the billet to a billet loading hole, quickly moves a container to a forward limit and starts extrusion.

[0002]

2. Description of the Related Art Conventionally, an extrusion press device loads a billet into a fixed container, extrudes the billet by a stem driven by a ram cylinder, and forms a predetermined cross-sectional shape by a die attached to an outlet of the container. It is designed to be molded. The billet loaded in such an extrusion press device is supplied by a billet loader. The billet sent from a billet carrier arranged on the operation side of the extrusion press device is gripped one by one, and this is taken. After being transferred to the billet loading hole of the container, the billet and the loading hole are aligned and sent out by the stem to be loaded into the container.

After that, the container moves forward until it comes into contact with the die, but in order to shorten the idle time of the extrusion press, the container is moved forward from the retracted position of the container, which is opened by separating the die from the container. It is operated so that the operation until it contacts the dice is performed in a short time,
For this reason, a signal when the container turns off the limit switch at a position slightly before the container comes into contact with the die is sent to the hydraulic pump to change the discharge rate of the pump and decelerate the container, so that the container violates the die. The end face of the die or the container was operated so as not to be damaged by the contact.

[0004]

However, when the billet is placed between the die and the container with the billet placed on the billet loader, the billet loader is moved linearly from the retreat limit to the forward limit which is the billet pushing center position. There is a method of moving the billet loader after receiving the billet from the billet carrier and moving the billet loader around the support shaft to the billet extrusion center position. Since each billet sent from the billet carrier arranged on the work is grasped one by one, there is a problem that operability is very poor.

Further, if the deceleration speed is increased just before the container comes into contact with the dice in order to shorten the idle time,
A container having a large inertia force directly hits the die, causing a large impact, and in a severe case, there is a problem that the container or the die is damaged. Conversely, in order to prevent a container having a large inertia force from directly hitting the dice and generating a large impact, there is a problem that if the deceleration speed is reduced, the idle time becomes longer. Thus, there is a problem that the high speed forward speed cannot be increased due to insufficient deceleration measures for shortening the idle time, and the idle time is still not reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to perform billet loading at a position below a work floor so as to greatly improve the operability of an extrusion press apparatus, and to form a billet on the work floor. A billet loader that transfers the billet to the billet loading hole of the container
An object of the present invention is to provide a short-stroke extrusion press apparatus in which a container is advanced until it comes into contact with a die to reduce idle time.

[0007]

In order to achieve the above object, the invention according to the present invention has a holding portion which is provided between a die and a container so as to be able to enter and exit and grips a billet supplied from a billet carrier. A billet loader provided with a transfer means such as a swing arm for transferring the billet gripped by the holding portion from the carrier to the billet loading port of the container of the extrusion press device, wherein the billet loader controls the billet holding portion. It has a billet holding part opening mechanism for opening the leg and a length measuring means for measuring the billet by pressing the end face of the billet supplied from the billet carrier in the axial direction with the billet holding part positioned at the lower limit. A billet pusher cylinder having a function of closing the billet holding part according to the length of the billet, and a billet pusher cylinder having the base of the swing arm. A lateral movement cylinder engaged with the loader lateral movement shaft and disposed so as to be able to move the billet holding portion in the axial direction; and a billet holding portion locked to the billet loader lateral movement shaft and tilting the billet holding portion in the machine direction. A tilting cylinder disposed rotatably is provided, one end is fixed to the container, and the other end is fixed to a piston rod moving forward and backward in the container cylinder to provide a piston head. A small-diameter portion having a smaller diameter and a certain length than the piston rod is extended on the rod end side,
On the rod end side in the container cylinder, a throttle portion having an inner diameter slightly larger than the small diameter portion of the piston head is provided, and a plurality of oil discharge ports having respective throttles are arranged in the throttle portion in the axial direction of the cylinder. I do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of a short stroke extrusion press according to the present invention will be described below with reference to FIGS.
8 will be described in detail.

FIG. 1 is a partially cutaway front view of an extrusion press apparatus for short stroke according to the present invention, FIG. 2 is an enlarged sectional view of a container cylinder of FIG. 1, and FIG. 3 is a diagram showing billet loading from a billet carrier to a billet loader. FIG. 4 is a plan view of the extrusion press device showing a state of loading the billet into the container, and FIG.
3 is a side view as viewed from A to A in FIG. 3, FIG. 6 is a side view as viewed from BB in FIG. 4, FIG. 7 is a front view of FIG. 4, and FIG.
C is a side view, FIG. 9 is a plan view when the billet loader is retracted, FIG. 10 is a plan view when the billet loader is extended, FIG. 11 is a cross-sectional view viewed from D to D in FIG.
FIG. 12 is an explanatory view showing a loaded state of a short billet, FIG. 13 is an explanatory view showing a loaded state of a long billet, FIG. 14 is an explanatory view showing loading of a long billet between a die and a container, and FIG.
FIG. 16 is an explanatory diagram showing a continuation of FIG. 14, FIG. 16 is an explanatory diagram showing a continuation of FIG. 16, and FIG. 18 is a diagram showing a continuation of FIG. FIG.

As shown in FIG. 1, reference numeral 28 denotes an extruded stem, and 100 denotes a fixed dummy block. A fixed dummy block which can be in close contact with an inner wall surface of a billet loading hole 53 is provided at a tip end of the extruded stem 28 for pushing a billet 29. 100 are provided. Fixed dummy block 1
00 and the extrusion stem 28 are connected to each other by bayonet (not shown). Fixed dummy block 100
Is fixedly provided on the front surface of the extrusion stem 28 and slidably provided on the inner wall surface of the billet loading hole 53.

A billet 29 is formed on the left and right horizontal outer surfaces of the main cylinder 16 by advancing an extrusion stem 28 into a die 7.
A side cylinder (not shown) for retreating the main ram (not shown) after being extruded from 2 is provided,
A pair of container cylinder devices 102 for moving the container 14 forward and backward with respect to the die 72 are disposed on the diagonal line of the main cylinder 16 so as not to interfere with the side cylinders. Reference numeral 102 denotes a container cylinder device for bringing the container 14 into and out of contact with the die 72, and is configured to be enlarged in FIG. The container cylinder device 102 has a plurality of oil drains 108 to 112 formed in the hollow cylinder tube 104 on the rod end side facing the narrowing portion 106 therein. The discharged oil can be transported to a hydraulic supply source or a tank (not shown).

A piston head 114 is slidably fitted in the cylinder tube 104, and a piston rod 116 is disposed on the rod side of the piston head 114. And the piston rod 1
16 is provided with a male screw 117 at the rear end thereof, while the male screw 11 is provided at the center of the piston head 114.
A female screw is engraved and screwed so that it can be screwed with 7. The reference numeral denotes a hydraulic supply port for moving the container 14 forward, the hydraulic supply port for retreating the container 14, and the hydraulic outlet for decelerating the container 14 forward.

The outer peripheral surface of the piston head 114 has a stepped shape having a different diameter, and a large-diameter cylindrical portion 114a having an outer diameter slidable with the inner peripheral surface of the cylinder tube 104; It is composed of a small-diameter cylindrical portion 114b formed slightly smaller than the peripheral surface. On the other hand, the inner peripheral portion of the cylinder tube 104 also has a stepped shape having a different diameter like the piston head 114.
14, a large-diameter circular wall portion 107 having a slidable diameter portion with the large-diameter cylindrical portion 114a, and a throttle portion 106 having a small-diameter cylindrical portion 114a of the piston head 114 and a slidable portion. ing.

Therefore, when pressurized oil is introduced from the hydraulic pressure supply port to advance the container 14 to abut the die 72, the introduced pressurized oil acts on the head portion 118 of the piston head to cause the piston head 114 to move. The piston head is advanced, but the advance limit is set at a position where the step portion 121 of the piston head comes into contact with the step portion 122 of the cylinder. At this time, the small-diameter cylindrical portion 114b of the piston head is configured to be inserted into the throttle portion 106. . At this time, the space 12 between the cylinder tube 104 and the piston rod 116
4 is discharged from the hydraulic discharge port to the outside through the oil discharge ports 108 to 112 by the advance of the piston head 114, but when the oil is discharged to the outside through the oil discharge ports 108 to 112. Is generated so that the forward speed of the piston head 114 is reduced.

Although the size of the discharge diameter of the oil discharge ports 108 to 112 may be the same, for example, the discharge diameter of the oil discharge port 108 close to the piston head 114 is maximized.
The discharge diameter of the oil outlet 112 farthest from the piston head 114 side is reduced, and the oil outlet 108 and the oil outlet 1 are reduced.
By successively reducing the size of the oil discharge ports 109 to 111 between the twelve 12, the container 14 can be further decelerated without contacting the die 72. Oil drain port 1
08 to 112 may have the same diameter.

Reference numeral 10 denotes an end platen, 14 denotes a container for loading a billet 29 for product extrusion, 16 denotes a main cylinder, and a main ram (not shown) is provided in the main cylinder 16. 20 is a main crosshead integrally attached to the tip of the main ram;
Is a tie rod, 24 is a machine base, 26 is a cylinder mounting block, and 27 is a mounting member.

An extruding stem 28 extending toward the end platen 10 is attached to the tip of the main crosshead 20 in the axial direction that is the forward and backward direction of the main crosshead 20. Reference numeral 72 denotes a die, and a billet loader 30 capable of entering and exiting from the container 14 and the die 72 is provided in a state where the container 14 is temporarily held at a position separated from the die 72.

The billet loader 30 includes an L-shaped swing arm 49A and a straight swing arm 49A.
B, a billet holding section 50, a clamp arm 67, and a cylinder 69 for driving a clamp arm. Ancillary facilities such as tilting and moving the billet loader 30 and pressing and moving the billet 29 placed on the billet loader 30 to a predetermined position are provided.

Such auxiliary equipment includes a billet holding unit leg opening device 32, a billet pusher device 36, a billet loader tilting device 40, and a billet loader lateral moving device 44. As shown in FIG. 8, the billet loader 30 receives the billet 29 transported by the billet carrier 60 at the time of the lowering limit, and then transports the billet 29 to the billet loading hole 53.

As shown in FIG. 8, a billet carrier 60 is provided.
A pit 54 is formed below the work floor near the lower two tie rods 22 of the four tie rods 22 (two at the upper part and two at the lower part) so that the operator can easily approach the operating side of the molding machine. It is formed and installed in the pit 54. The billet carrier 60 transports the billet 29 heated by a billet heater (not shown) to the billet loader 30. The billet carrier 60 has a horizontal table 62, and a delivery holder 64 that bridges the billet loader 30 via the horizontal table 62. Is installed.

As shown in FIG. 5, the delivery holder 64 has a V-shaped billet receiving portion, and is slidable on a guide (not shown) provided on the horizontal base 62. Is attached to a support shaft 66 so as to be able to tilt at the end of the horizontal base 62. It can be driven to swing by a cylinder mechanism (not shown), and receives the billet 29 with the V-shaped receiving portion opening directed toward the upstream side of the horizontal base 62 first, and further rotates downstream to send the billet 29 to the billet holding portion 55. To be driven.

The billet carrier 60 supplies the billet 29 one by one to the billet loader 30. The billet loader 30 grasps the billet and transfers it to the billet loading hole 53. For this reason, the billet loader 30 is disposed so as to face the billet carrier 60, and includes a swing arm 49 formed to be pivotable along a plane perpendicular to the extrusion center line of the molding machine. The swing arm 49 includes an L-shaped swing arm 49A and a straight swing arm 49B.

That is, the swing arm 49 is connected to the turning center shaft 5 disposed inside the lower tie rod 22 of the molding machine.
One end is pivotally connected to 6. And swing arm 4
9 has a billet carrier 60 by a swing operation.
Is set to reciprocate between the delivery holder 64 and the billet loading hole 53 of the container 14. In order to perform a swing operation, a substantially L-shaped projecting member 57 is fixed to the rear end of the swing arm 49, and the billet loader tilting device 40 is attached to the end of the projecting member 57.
The rod 40 of the billet loader tilting cylinder 41 which forms
b is connected and the swing arm 49
To drive.

Here, a billet holder 50 for holding the billet 29 is attached to the tip of the swing arm 49. The billet holding part 50 is composed of an upper clamp part 58 and a lower clamp part 59, and the planar shape of the lower clamp part 59 is almost the same as that of the upper clamp part 58. The lower clamp portion 59 has a pedestal 51 that supports the lower surface of the billet 29 at the container loading position, and a liner 52 that is in direct contact with the billet 29 is provided in the lower clamp portion 59. The liner 52 is composed of a fixed liner 52a arranged by the width of each of the swing arms 49A and 49B, and a pair of swing arms 49A and 49A.
A movable liner 52b that moves relative to the swing arms 49A and 49B while making relative movement with the opening and closing legs between B.
Are alternately arranged.

As shown in FIG. 11, the movable liner 52b is formed in a convex shape by a fixed liner 52a and surrounds the side and bottom of the movable liner 52b so as not to deviate from the axis of the movable liner 52b. Restricts movement other than direction. Further, flange-shaped projections are fixed to both ends of the movable liner 52b, and a pair of swing arms 49A, 49A are provided.
In addition to restricting the degree of leg opening between B by being locked by the flange-shaped protrusion, the width of the pair of swing arms 49A, 49B from both outer sides when the legs are closed and the width of the movable liner are determined. The length 52b is configured to be the same width.

Each of these liners 52 has a billet 29
The billet 29 abuts on the billet 29 by the liner 52 so as to form a V-shaped surface so that the supported billet 29 is stably held. I have. A clamp arm 67 is attached to one end of the swing arm 49A via a support shaft 68. On the other hand, the upper clamp portion 58 is
The clamp arm 67 has a billet holding portion 58a at the distal end so that the billet 7 and the billet 29 can be pressed from above. The clamp arm 67 is formed so that the tip thereof presses the billet 29 placed on the liner 52 of the billet holding portion 50 from the upper surface side by being rotated about the support shaft 68. A clamp arm driving cylinder 69 connected to the clamp arm 67 is provided.
And the clamp arm 67 is swung by the expansion and contraction of the rod 70. Therefore, the billet 29 in the billet holding section 50 is
And the clamp arm 67 to prevent falling during transfer.

Next, the billet loader lateral moving device 44 and the billet loader tilting device 40 will be described. The billet loader lateral movement device 44 includes a billet loader lateral movement seal 44a, a billet loader lateral movement rod 44b, and a billet loader lateral movement engagement rod 44c. The billet loader tilting device 40 includes a billet loader tilting cylinder 40a, a billet loader tilting rod 40b, and an engaging member 40c.

The billet loader lateral movement rod 44b and the billet loader lateral movement engagement rod 44c, which form a part of the billet loader lateral movement device 44, are fixedly arranged in a series state. 44
With the expansion and contraction of b, the billet loader lateral movement engagement rod 44b is fixedly disposed on the billet loader lateral movement silling 44a side, the bracket 40d fixedly disposed on the billet loader lateral movement rod side, Fixed brackets 40d, 4 provided on both sides of the engagement member 40c.
0e is freely inserted. The billet loader 30 and an engaging member 40c forming a part of the configuration of the billet loader tilting device 40 are inserted and engaged on the way of the billet loader lateral movement engaging rod 44c.

The billet loader lateral movement engaging rod 44c can be moved back and forth only in the axial direction after the engaging member 40c is inserted. The engaging member 40c is a billet of the billet loader tilting cylinder 40a. It is fixed to the tip of the loader tilting rod 40b. When the shape of the billet loader lateral movement engagement rod 44c is, for example, a spline shaft, or a key is implanted to make the billet loader 30 engage with the engagement member 40c, the billet loader tilting rod Due to the expansion and contraction of 40b, the billet loader 30 lowers the lower limit position (the position below the work floor) for receiving the billet 29 from the billet carrier 60 shown by the two-dot chain line in FIG.
3 can be tilted between the positions where the billets 29 are loaded.

As described above, the billet loader 30
After the engagement rod 44c for lateral movement of the billet loader is inserted through the bases of the L-shaped swing arm 49A and the straight type swing arm 49B, the arms are provided on both outer sides of the L-shaped swing arm 49A and the straight type swing arm 49B. Locking plate 45 for restricting the legs of 49A and 49B
Is fixed to the billet loader lateral movement engagement rod 44c. Therefore, as shown in FIG. 3, the billet loader 30 moves in the same manner as the billet loader lateral movement rod 44b expands and contracts.
Is in the state of being close to the retracted container 14 side. Conversely, when the billet loader lateral movement rod 44b moves forward, the billet loader moves forward and is in contact with the die 72.

Next, the billet pusher device 36 will be described. The billet pusher device 36 includes a billet pusher cylinder 36a, a billet pusher rod 36b, and a billet pressing portion 36c. When the billet 29 is received from the billet carrier 60 at the lower limit position of the billet loader 30 as shown in FIG. 29
Is mounted on the side surface of the cylinder mounting block 26 of the end platen 10 opposite to the end platen 10 so as to be pressed from the cylinder mounting block 26 side to the end platen 10 side while being positioned on the same axis as the axis of the shaft.

The billet pusher device 36 as the billet-side length means measures the length of the billet 29 by temporarily contacting the stopper 74 even if the billet 29 is long or short. For example, when the length of the billet 29 is short, The billet pusher rod 36b of the billet pusher cylinder 36a is advanced, and the end of the billet 29 and the end of the runner 52 are moved by the billet pressing portion 36c until the end face of the billet 29 comes into contact with the stopper 74 provided on the end face of the billet loader 30 on the die 72 side. By pressing the parts simultaneously, the stopper 7
The length of the billet 29 is measured with 4 as a base end.

If the billet 29 protrudes from the open state of the straight swing arm 49B and the anti-L-shaped swing arm 49A, the billet 29 is first pressed by the end face of the billet pressing portion 36c.
The billet pressing portion 36c is
End face moves forward. Conversely, the billet 29 has a straight swing arm 49B and an anti-L-shaped swing arm 49A.
Is retracted from the state where the legs are opened, first, the end face of the liner 52 is pressed by the end face of the billet pressing portion 36c to narrow the straight swing arm 49B and the L-shaped swing arm 49A. 49B is moved, but the end face of the billet pressing portion 36c continuously contacts the end face of the billet 29, and when the billet 29 finally contacts the stopper 74, the end face of the billet 29 and the end face of the liner 52 have the same surface. Becomes

Next, the billet holding unit leg opening device 32 will be described. The billet holder leg opening device 32 includes a billet holder leg opening rod 32a, a billet holder leg opening pusher 32b, and a push-back stopper 33. The push-back stopper 33 is fixed to the straight swing arm 49B so as to extend therefrom. When the L-shaped swing arm 49A and the straight type swing arm 49B constituting the billet loader 30 are opened as shown in FIG. 10, the push-back stopper 33 extends the billet holding part opening rod 32a to extend the billet. Pusher 3 for leg opening of billet holding portion at tip of holding portion opening rod 32a
When the push-back stopper 33 is pressed by 2b, the L-shaped swing arm 49A and the straight type swing arm 49B are opened.

Reference numeral 76 denotes a shear device, 78 denotes a shear blade,
80 is a discard chute, 82 is an oil tank, 8
4 moves the container 14 to the main crosshead 20 when the container 14 retreats (moves to the main crosshead 20 side).
A shock absorber 84 is provided on the main crosshead 20 so as to be able to absorb the inertia of the container 14 even if the container 14 collides with the main crosshead 20 when quickly retracted to the side. . The shock absorber 84 has a pressing portion 86 attached to the tip of the rod 85 in a relationship between a general piston (not shown) and the rod 85.
Is fixed, and the container 14 comes into contact with the pressing portion 86 to receive the inertial force of the container 14 toward the main crosshead 20.

The operation of the above-described short stroke extrusion press will be described.

First, as shown in FIG. 5, the billet loader 30 is located at the lower limit position located below the work floor, and the billet 29L-shaped swing arm 49A and the straight-type swing arm 49A are provided so that the billet 29 can be easily received from the billet carrier 60. The billet loader 30 of the swing arm 49B also has a state in which the upper clamp part 58 and the lower clamp part 59 are opened. In such a state, after receiving the billet 29 from the billet carrier 60, the billet pusher device 3
6, the billet pusher rod 36b moves forward, the billet pressing portion 36c presses the end of the billet 29 toward the die 72, and the end of the hillet 29 is aligned and stopped until the end of the billet 29 contacts the stopper 74 and stops. At the same time as the billet side length is adjusted, the positional relationship between the billet 29L-shaped swing arm 49A and the straight type swing arm 49B is adjusted to the billet length, and then the rod 70 of the clamp arm driving cylinder 69 is extended to close the upper clamp portion 58. Then, the billet 29 is clamped between the upper clamp part 58 and the lower clamp part 59.

In the case of the short billet 29 having a short billet 29, the L-shaped swing arm 49A and the straight swing arm 49B constituting the billet loader 30 are closed as shown in FIG. Hold it. Conversely, in the case of a long billet 29 having a long billet 29, as shown in FIG.
The billet 29 is gripped in a state where the L-shaped swing arm 49A and the straight type swing arm 49B constituting the "0" are opened.

As described above, the open leg size of the L-shaped swing arm 49A and the straight type swing arm 49B is determined according to the length of the billet 29. As described above, after the billet 29 is clamped between the upper clamp portion 58 and the lower clamp portion 59, the billet loader tilting rod 40c of the billet loader tilting device 40 is extended, and the billet loader 30 grips the billet 29. In this state, the billet lateral movement cylinder 44a of the billet loader lateral movement device 44
Pressure oil is supplied to the billet loader lateral movement rod 44
b extends to the die 72 side to the forward limit. FIG. 6
As shown in the figure, the swinging transfer is performed around the turning center 56 to the billet loading hole 53 of the container 14 located above the work floor, and the billet 29 and the billet loading hole 53 are aligned (FIG. 14).

Next, the extruding stem 28 is advanced to clamp the billet 29 between the die 72 and the extruding stem 28 (FIG. 15). From this state, when the clamp arm driving cylinder 69 of the clamp arm 67 is driven to retract the rod 70, the upper clamp portion 58 is released from the billet 29. Next, when the billet loader tilting rod 40c of the billet loader tilting device 40 is retracted, the billet loader 30 descends around the turning center 56 to the lower limit of the billet loader 30 (FIG. 1).
6).

When the billet loader 30 is lowered to the lower limit, then, when pressurized oil is supplied from a hydraulic supply port for advancing the container 14, the small-diameter cylindrical portion 114 a of the piston head 114 is throttled immediately before the container 14 approaches the die 72. After entering the portion 106, the oil discharge ports 108 to 112 are sequentially closed by the small-diameter cylindrical portion 114a of the piston head 114, so that the amount of oil discharged from the cylinder tube 104 gradually decreases, and finally the oil discharge When the ports 108-112 are closed by the piston head 114, the container 14 stops just before the die 72. At this time, the container 14 and the die 72 are in contact with each other. The container 14 can be advanced at a high speed until just before it comes into contact with the die 72, and will never collide even if the advance speed of the container 14 is increased.

After the container 14 comes into contact with the die 72, the billet 29 is crushed in the container 14 by slowly moving the extrusion stem 28 forward. In this case, air that has escaped remains in a space surrounded by the billet 29, the die 72, and the container 14, and if the extrusion stem 28 is advanced in this state, the air will flow into the product during product extrusion. As it appears as a blister in the state of being included in the
From the upset state shown in FIG. 7, the container 14 is once retracted to the main crosshead 20 side to discharge the compressed residual air.

After releasing the residual air, the container 14 is advanced again to make contact with the die 72,
When the extrusion stem 28 is advanced again, a desired extruded product is obtained from the die 72. When the extrusion stem 28 is advanced to a predetermined position, the billet 29 is pushed out at the end of the extruded product while extruding the so-called discard 90 in the container 14, so that the container 14 is retracted from this state. The extrusion stem 28 is also retracted, but the container 14 is retracted until stopped by the shock absorber 84 as described above. Then, when the discard 90 is removed from the extruded product by lowering the shear blade 78 of the shearing device 76, the discard 90 falls into the discard chute 80 and is collected.

Subsequently, when the billet loader tilting rod 40c of the billet loader tilting device 40 is retracted during the above operation, the billet loader 30 swings and moves backward to the retreat limit located diagonally below the die 72. .

When the billet loader 30 retreats to the retreat limit position shown in FIG. 3, the billet holding portion opening leg 32a of the billet holding portion opening device 32 is extended to prepare for the next supply of the billet 29, thereby holding the billet. The push leg 32b is advanced to push the push-back stopper 33 toward the main crosshead 20, and the billet loader 30 is opened. Thus, the billet 29 can be received (FIG. 18). As described above, when the billet 29 is received by the billet carrier 60, the billet loader 30
The billet lateral moving device 4 is kept at the lowermost position.
Since the pressure oil is supplied to the billet lateral movement cylinder 44a and the billet lateral movement rod 44b is expanded, the billet loader 30 moves forward (in the die 72 side) while holding the billet 29. .

On the other hand, in parallel with the above operation, the operation for transferring the billet 29 sent from the billet carrier 60 to the next billet loader 30 at the lower limit position is started. The billet 29 is extruded from the die 72 by further advancing the extrusion stem 28.

[0047]

As apparent from the above description, the present invention has the following advantages. That is, even if the billet is positioned between the die and the fixed dummy block and the container is subsequently advanced at a high speed, the container is decelerated before coming into contact with the die, so that the container and the die are not damaged and idle time is reduced. It can be shortened. Since the billet is transported under the work floor, the workability on the operation side is good. Because of the swing arm system from the lower side to the upper side, the operation time for raising and lowering the billet loader is shortened, and the idle time of the extrusion press can be shortened.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a short stroke extrusion press apparatus according to the present invention.

FIG. 2 is an enlarged sectional view of the container cylinder of FIG.

FIG. 3 is a plan view of the extrusion press device showing a state of billet loading from a billet carrier to a billet loader.

FIG. 4 is a plan view of the extrusion press device showing a state in which billets are loaded into containers.

FIG. 5 is a side view as viewed from A to A in FIG. 3;

FIG. 6 is a side view as viewed from BB in FIG. 4;

FIG. 7 is a front view of FIG. 4;

8 is a side view as viewed from C to C in FIG. 7;

FIG. 9 is a plan view when the billet loader is retracted.

FIG. 10 is a plan view when the billet loader is extended.

FIG. 11 is a sectional view taken along line D-D in FIG. 10;

FIG. 12 is an explanatory diagram showing a loaded state of short billets.

FIG. 13 is an explanatory view showing a loaded state of a long billet.

FIG. 14 is an explanatory diagram showing loading of a long billet between a die and a container.

FIG. 15 is an explanatory diagram showing an operation continued from FIG. 14;

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;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 End platen 14 Container 16 Main cylinder 20 Main cross head 22 Tie rod 24 Machine base 26 Cylinder mounting block 27 Mounting member 28 Extrusion stem 29 Billet 30 Billet loader 32 Billet holding part opening device 36 Billet pusher device 40 Billet loader tilting device 40a Billet loader tilting cylinder 40b Billet loader tilting rod 40c Engaging member 40d, 40e Fixing bracket 44 Billet loader lateral moving device 44a Billet loader lateral moving cylinder 44b Billet loader lateral moving rod 44c Billet loader lateral moving engaging rod 44d , 44e Bracket 45 Locking plate 49 Swing arm 49A L-shaped swing arm 49B Straight swing arm 50 Billet holder 1 Pedestal 52 Runner 52a Fixed liner 52b Movable liner 52c Sliding member 53 Billet loading hole 54 Pit 55 Billet holding part 56 Revolving center axis 57 Projecting member 58 Upper clamp part 59 Lower clamp part 60 Billet carrier 62 Horizontal table 64 Sending out Holder 66, 68 Support shaft 67 Clamp arm 69 Clamp arm driving cylinder 70 Rod 72 Dice 74 Stopper 76 Shear device 78 Shear blade 80 Discard chute 82 Oil tank 84 Shock absorber 85 Rod 86 Pressing portion 90 Discard 100 Fixed dummy block 102 Container Cylinder 104 Cylinder Tube 106 Restrictor 107 Large Diameter Inner Wall of Container Cylinder 108-112 Oil Drain Port 114 Piston Head 114a Large Diameter Circle Part 114b small-diameter cylindrical portion 116 piston rod 117 male thread 118 of the front portion 121 piston head of the head portion 120 piston head of the piston head of the stepped portion 122 cylinder tube stepped portion 124 spaces

Claims (1)

(57) [Claims] A holding portion is provided between a die and a container so as to be able to enter and exit, and holds a billet supplied from a billet carrier. A billet loader provided with a transfer means including a swing arm for transferring to a billet loading port, wherein the billet loader has a billet holding unit opening mechanism for opening the billet holding unit,
With the billet holding unit positioned at the lower limit, the end face of the billet supplied from the billet carrier is pressed in the axial direction to measure the billet. A billet pusher cylinder having a function of closing the legs, and a laterally moving cylinder disposed so that the base of the swing arm is engaged with a billet loader laterally moving shaft so that the billet holding portion can be moved in the axial direction. A billet loader is provided with a tilting cylinder that is locked to the lateral movement shaft and is disposed to be able to tilt the billet holding part in the machine side direction, one end is fixed to the container, and the other end is inside the container cylinder. Is fixed to a piston rod moving forward and backward, a piston head is provided, and a small-diameter portion having a smaller diameter and a fixed length than the piston rod is provided on the rod end side of the piston head. Along with the extension, a throttle portion having an inner diameter slightly larger than the small diameter portion of the piston head is provided on the rod end side in the container cylinder, and a plurality of oil discharge ports each having a throttle are provided in the throttle portion in the axial direction of the cylinder. An extrusion press for short strokes, which is provided side by side.