JP6221810B2 - Billet insertion device for extrusion press - Google Patents

Description

  The present invention relates to an extrusion press apparatus, and more particularly to quality improvement of an extruded product when a billet is inserted into a container hole at the center of a press in a rear loading type extrusion press.

In general, when a billet made of a metal material such as aluminum or an alloy material thereof is extruded by an extrusion press device, an extrusion stem is attached to the tip of a main ram driven by a hydraulic cylinder, and a container is pressed against a die. Then, the billet is stored in the container with an extrusion stem or the like. Then, the billet is pressed by the extrusion stem by further advancing the main ram by driving the hydraulic cylinder. Therefore, the molded product is extruded from the outlet of the die.

  In this conventional extrusion press apparatus, when the billet is loaded into the container, the tip of the extrusion stem must be retracted by the length of the billet, so that the stroke of the main ram is equal to the billet length. It has become the length of. Therefore, in order to secure the stroke of the main ram, the entire conventional extrusion press apparatus is lengthened, the hydraulic cylinder driving the main ram is also enlarged, and the amount of oil to be operated is increased accordingly. Necessary.

  In recent years, a short stroke press method called a rear rotating type has been adopted. In this rear loading type, when the billet is supplied, the extrusion stem is moved in order to secure a billet supply space. The extrusion stem is horizontally moved from the original extrusion stem position, for example, and a space for supplying billets is opened on the side of the extrusion stem on the extrusion stem side of the container. Billet is supplied to this space.

  In supplying billets, a billet insertion device provided in the billet loader device is driven in the axial direction, and the billet is inserted into the billet receiving portion of the container and loaded.

  When the billet is further inserted and loading into the billet accommodating portion is completed, the billet loader device is retracted to the side from the extrusion press device, and the operation proceeds to the next billet loading preparation operation. Thereafter, the moved extrusion stem is driven and returned to the original axial position of the billet accommodating portion. Therefore, when the main hydraulic cylinder is driven and the main ram advances, the extrusion stem starts to press the billet, and thereafter the billet is extruded by a die.

JP-A-7-171618

The conventional extrusion press has the following problems.
When inserting a billet into a container to extrude a pure aluminum billet such as 1000 series, the material is soft and sticky, and due to the frictional force caused by the contact between the bottom surface of the container and the bottom surface of the billet, It may be forced to stop. For this reason, the extrusion press operation stopped, leading to a decrease in productivity.

In the invention of Patent Document 1, the conventional extrusion press has the following problems.
In other words, since a large number of billet transport rollers are attached to the two swing arms, the structure is complicated and maintenance is not easy.
Furthermore, when the billet is pushed by the extrusion stem, the aluminum adheres to the conveyance roller when the conveyance roller is widened. As a result, the conveyance roller slips and the core does not come out.
In addition, the aluminum adheres to the fixed dummy block, the life of the fixed dummy block is shortened, and maintenance including cleaning is not easy.

Billet holding device that inserts the billet into the container by pushing the billet end face after the billet is transported to the press center by the billet supply device etc. when inserting the billet into the container hole at the center of the press with the rear loading type extrusion press In the billet insertion device consisting of the billet pushing device,
By pressing and holding the billet end on the pushing side downward, the billet end is prevented from sagging downward due to the weight of the insertion tip, and is movable in the container direction of the press.

  At the start of billet insertion, the billet holding device of a rotatable lever was pushed in close contact with the billet, and the pushing force was increased following the friction force acting between the billet and the container.

  The billet holding device has a structure that allows the billet to move in the extrusion direction while restraining the vertical direction of the billet, and that the downward holding force increases in proportion to the load acting on the pushing force.

  A billet holding device capable of pushing and holding the billet end portion of the pushing-side billet end surface so as to be freely separated from the billet pushing device was configured.

  When the billet is delivered from the billet carry-in device, the billet holding device can be retracted to a predetermined position so that the billet can pass.

  After the billet has been inserted into the container, a device for pushing back the billet holding device is provided in the pushing device driving chain so that the billet holding device can be moved to the initial position by driving the chain.

  The height of the billet bottom surface of the billet insertion device was arranged slightly above the container bottom surface.

Billet holding device that inserts the billet into the container by pushing the billet end face after the billet is transported to the press center by the billet supply device etc. when inserting the billet into the container hole at the center of the press with the rear loading type extrusion press In the billet insertion device consisting of the billet pushing device,
The billet end on the pushing side is pressed and held downward and can be moved in the direction of the container of the press. At the start of billet insertion, the pushing force is increased following the friction force acting between the billet and the container. A rotatable lever billet holding device,
The billet holding device and the billet pushing device are structured so that the billet can be moved in the pushing direction while restraining the vertical direction of the billet, and the downward holding force increases on the billet as the load is applied to the pushing force.

  When a billet is inserted into a container to extrude a pure aluminum billet such as 1000 series, the material is soft and sticky, and a holding force is applied to the bottom of the billet pushing end to contact the bottom surface of the container and the bottom surface of the billet. Although the frictional force was generated, the frictional force was reduced, so that it was not stopped in the middle of inserting the billet into the container, and the press operation was continuously performed, leading to an improvement in productivity.

It is drawing explaining the basic concept of this invention. 1 is an overall overview of a billet insertion device of the present invention. It is a figure explaining the billet holding device of the present invention. It is a figure explaining the form in operation | movement of the billet holding | maintenance apparatus and billet pushing-in apparatus of this invention. It is a figure explaining the initial position of the billet holding device and billet pushing device of the present invention. It is a whole external view and operation | movement flowchart of this invention. The billet insertion device in which the billet holding device and the billet pushing device according to the present invention are integrated is a diagram (a) where the billet is inserted and a diagram (b) where the billet is completely inserted. It is an enlarged view of the billet insertion device which united the billet holding device and billet pushing device of the present invention. FIG. 4 is an overall outline view and an operation flow diagram in which the billet holding device and the billet pushing device of the present invention are integrated.

  An embodiment of a billet insertion device for a rear loading extrusion press according to the present invention will be described below in detail with reference to the drawings.

  As shown in FIG. 6, in the rear loading extrusion press used in the present invention, the end platen 1 and the main cylinder 7 are arranged to face each other, and both are connected by a plurality of tie rods 4. A container 3 is arranged on the inner side surface of the end platen 1 with a die 2 having an extrusion hole formed therebetween, and a billet 10 is loaded into the container 3, and this is extruded and pressed toward the die 2 to form a die hole. An extruded product with a corresponding cross section is extruded.

  The main cylinder 7 that generates the pushing force includes a main ram 8 that can be pressurized and moved toward the container 3. A free dummy block (not shown) is in close contact with the front end of the main ram 8 so as to be concentric with the billet loading hole of the container 3 at the front end of the main ram 8, and the main cross in a state of protruding toward the container 3. It is attached via the head 6. Accordingly, when the main cylinder 7 is driven and the main cross head 6 is advanced, the extrusion stem 5 is inserted into the billet loading hole of the container 3, and the extruded billet 10 is pressed by pushing the rear end face of the loaded billet 10. is there.

  A plurality of side cylinders 9 are attached to the main cylinder 7 in parallel with the extrusion axis, and the cylinder rods are connected to the main cross head 6. As a result, the extrusion stem 5 is initially moved to a position close to the container 3 as a preparation step for the extrusion step, and the extrusion pressure operation is performed using both the main cylinder 7 and the side cylinder 9.

  FIG. 1 shows the basic concept of the present invention. When the billet 10 is pushed into the container 3, the tip portion tends to hang downward due to its own weight. Due to this phenomenon, a frictional force acts between the lower surface of the tip of the billet 10 and the lower surface of the container 3 to cause various harmful effects. Therefore, in the present invention, the above-described sagging is prevented by pressing the top end opposite to the billet 10 from the upper surface.

  FIG. 2 shows an overview of the entire billet insertion device 70 including the billet holding device 30 and the billet pushing device 50.

FIG. 3 shows a side view, a plan view, and a cross-sectional view of the billet holding device of the present embodiment. The billet holding device 30 does not have a drive source, and is configured to move by a linear guide 38 by being pushed by a pushing plate 55 held by a billet pushing device 50 that moves independently of the billet holding device 30.
The billet holding device is composed of one holding frame 33, a holding arm 31, two pressing balls 35 and a spring portion 36, and can be freely moved linearly by a linear guide 38 via a guide 40 and a holding support 37. It is like that.
At the start of pushing, the holding arm 31 is pulled by the spring 32 and stands counterclockwise. At the same time, the pressing ball 35 is not in contact with the billet 10. Usually, when there is no frictional resistance between the tip of the billet 10 and the container 3, that is, when the billet 10 is smoothly inserted into the container 3, the billet 10 is inserted into the container 3 in this state.

However, when a frictional resistance due to contact with the container 3 is generated at the tip of the billet 10, the holding arm 31 rotates clockwise following the frictional resistance. When the frictional resistance increases and the holding arm 31 rotates clockwise, the roller 34 of the billet holding device 30 and the roller 54 of the pressing portion of the billet pushing device 50 are aligned, and the billet pushing device 50 pushes the billet 10 in. Become.
When the frictional resistance is increased as described above, the holding arm 31, the pressing ball 35, and the spring portion 36 are interlocked. Therefore, the pressing ball 35 and the spring portion 36 are integrally formed to draw a circular arc in the clockwise direction. 10 A pressing force is applied to the upper part. The magnitude of the load increases as the holding arm 31 rotates, and the roller 34 of the billet holding device 30 and the roller 54 of the pressing portion of the billet pushing device 50 are in a straight line, that is, both rollers push the billet 10 simultaneously. Then, the pressing force by the pressing ball 35 and the spring portion 36 is maximized, and the tip of the billet 10 is pressed from above.
In this drawing, the pressing force is generated by the pressing ball 35 and the spring portion 36, but it may be a roller plunger, a hydraulic cylinder, an air cylinder, or a ball screw driven by a servo motor.
The spring 32 that holds the holding arm 31 may be a hydraulic cylinder, an air cylinder, or a ball screw driven by a servo motor.

  FIG. 2 shows an outline of the billet pushing device 50. The billet pushing device 50 includes a roller 54, a roller support 53 that supports the roller 54, and a pushing bracket 52. As can be seen from FIG. 2E, a roller 54, which is a billet pressing portion, is attached to the tip. As shown in FIG. 5G, the billet pushing device 50 stands by at the lower part of the free roller part 72 of the billet loader as shown in the state (g), and after the billet 10 reaches the upper part of the free roller part 72 of the billet loader, It moves upward by driving.

FIG. 2C shows a form of the retracting device 60 of the billet holding device 30.
The retracting device 60 includes a retracting cylinder 61 and a retracting component 62.
When the billet 10 enters the free roller portion 72 of the billet loader, the billet holding device 30 must be retracted from the path of the billet 10 so as not to interfere with the billet holding device 30.
In this case, the evacuation device 60 is used. The retracting device 60 includes a retracting cylinder 61 and a retracting component 62, and moves the billet holding device 30 to a position that does not interfere with the billet 10 in a direction perpendicular to the insertion device axis by driving the cylinder.
In addition, since the billet holding device 30 slides and moves on the guide 40, the position does not shift even if the billet holding device 30 returns to the original position after retraction.

FIG. 4A shows a state where the billet pushing device 50 is pushing the billet 10 into the container 3, and FIG. 4B shows a state where the billet pushing device 50 has pushed the billet 10 into the container 3. Indicates.
In any case, there is a gap between the lower surface of the billet 10 and the lower surface of the container 3, and the billet 10 is smoothly inserted into the container 3 without being damaged and without causing frictional resistance.

The initial positions of the billet holding device 30 and the billet pushing device 50 will be described.
FIG. 5 shows initial positions of the billet holding device 30 and the billet pushing device 50.
The initial position refers to a standby position of the billet holding device 30 and the billet pushing device 50 so as not to interfere with the billet 10 when the billet 10 enters the free roller portion 72 of the billet loader.
The billet holding device 30 is retracted above the free roller portion 72 of the billet loader at a position where the billet 10 does not interfere when entering the free roller portion 72 of the billet loader, that is, in a direction perpendicular to the axis of the free roller portion 72 of the billet loader. The set position becomes the initial position. Details are shown in FIG.
Since the billet holding device 30 does not have a drive source, when the billet 10 is inserted, the billet holding device 30 is pushed by the billet pushing device 50. When the billet 10 is completely inserted, the billet holding device 30 is returned to the initial position by the return attachment 71 attached to the chain. By pushing the hook 30 of the holding device 30, it returns to the initial position.
On the other hand, the billet pushing device 50 is on the billet 10 entry side of the billet insertion device and below the free roller portion 72 of the billet loader. The billet pushing device 50 pushes the billet holding device 30 to insert the billet 10 into the container 3. The drive source is a motor, and the return to the initial position is also driven by the motor.

FIG. 6 shows an operation flow of the embodiment of the present invention.
(1) The billet 10 is preheated by the billet heater 21 and moved to the billet carry-in device 23.
(2) The billet 10 is moved from the billet heater position to the center position of the billet pusher 26 by the billet transfer device 24.
(3) The billet 10 on the billet transfer device tray 23 is moved to the billet loader 27 by the billet pusher 26.
(4) The billet pusher 26 moves backward.
(5) The billet holding device 30 moves from the initial position to the center of the free roller portion 72 of the billet loader 27 of the billet loader 27.
(6) Until the billet 10 hits the stopper 29, the billet pushing device 50 rises from the lower part of the billet insertion device and advances together with the billet holding device 30.
(7) The billet loader 27 moves to the extrusion press center.
(8) The billet pushing device 50 pushes the billet 10 using the billet holding device 30 and inserts the billet 10 into the container 3.
(9) The billet holding device 30 is moved backward by the chain drive of the billet pushing device 50 and slightly separated from the container 3.
(10) The billet loader 27 moves backward.
(11) The billet pushing device 50 and the billet holding device 30 are moved back to the initial position.

The case where the billet holding device 30 and the billet pushing device 50 can move independently has been described above, but an embodiment in the case where the billet holding device 30 and the billet pushing device 50 are integrated will be described.
The configuration for inserting the billet 10 into the container 3 and the configuration for pressing the upper portion of the end of the billet 10 by the pressing ball 35 and the spring portion 36 are the same, but the billet holding device 30 and the billet pushing device 50 are integrated. In the apparatus, the retracting device 60 for retracting the billet holding device 30 from the intrusion of the billet 10 and the return attachment 71 for returning the billet holding device are not required. Further, each of the billet holding device 30 and the billet pushing device 50 has an initial position, and there has been a configuration necessary for realizing it. The position that does not interfere with the billet 10 at the end is the initial position.
Further, the integrated unit may be a linear guide instead of the free roller portion 72 of the billet loader.

FIG. 8 shows an operation flow of the embodiment of the present invention.
(1) The billet 10 is preheated by the billet heater 21 and moved to the position of the stopper 41.
(2) A billet conveying device (not shown) clamps the billet 10.
(3) The billet transport device (not shown) is raised and transports the billet 10 to the center of the freeroller 72 of the billet loader.
(4) A billet conveying device (not shown) is retracted to the initial position of the free roller 22.
(5) The billet pushing device 70 pushes the billet up to the stopper 29.
(6) The extrusion is completed, and the billet 10 of the next process is moved to the machine center of the extrusion press by the billet loader 27.
(7) The billet insertion device 70 starts pushing the billet 10. At this time, the billet holding device 30 automatically operates.
(8) Insertion of the billet 10 into the container 3 is completed.
(9) The billet loader 27 moves backward.
(10) The billet insertion device 70 returns to the initial position.

Since this invention is the above structure, the following effects are acquired.
When a billet is inserted into a container to extrude a pure aluminum billet such as 1000 series, the material is soft and sticky, and a holding force is applied to the bottom of the billet pushing end to contact the bottom surface of the container and the bottom surface of the billet. Although the frictional force was generated, the frictional force was reduced, so that it was not stopped in the middle of inserting the billet into the container, and the press operation was continuously performed, leading to an improvement in productivity.

DESCRIPTION OF SYMBOLS 1 End platen 2 Dies 3 Container 4 Tie bar 5 Extrusion stem 6 Main cross head 7 Main cylinder 8 Main ram 9 Side cylinder 10 Billet 21 Billet heater 22 Free roller 23 Billet carrying-in apparatus tray 24 Billet transfer apparatus 25 Rail 26 Billet pusher 27 Billet loader 28 frame 29 stopper 30 billet holding device 31 holding arm 32 tension spring 33 holding frame 34 roller 35 pressing ball 36 spring part 37 holding support 38 linear guide 39 hook 40 guide 41 stopper 50 billet pushing device 51 roller 52 pushing bracket 53 roller Support 54 Roller 55 Push-in plate 56 Roller guide part 60 Retraction device 61 Retraction cylinder 62 Retraction part 70 Billet insertion device 71 Attachment for return 72 Free roller part of billet loader

Claims (9)

Billet holding device that inserts the billet into the container by pushing the billet end face after the billet is transported to the press center by the billet supply device etc. when inserting the billet into the container hole at the center of the press with the rear loading type extrusion press In the billet insertion device consisting of the billet pushing device,
Billet insertion characterized in that the billet end on the push-in side is pressed and held downward to prevent it from drooping downward due to the weight of the insertion tip, and is movable in the container direction of the press apparatus.   The billet holding device of a rotatable lever is pushed in close contact with the billet at the start of billet insertion, and the pushing force can be increased following the friction force acting between the billet and the container. The billet insertion device described in 1.   The billet holding device is configured to be movable in the pushing direction while restraining the vertical direction of the billet, and has a structure in which the downward holding force increases in proportion to the load acting on the pushing force. The billet insertion device described in 1.   The billet insertion device according to claim 1, wherein the billet holding device is configured to be able to press and hold the billet end portion of the pushing-side billet end surface so as to be freely separated from the billet pushing device.   The billet insertion device according to claim 1, wherein when the billet is delivered from the billet carry-in device, the billet holding device can be retracted to a predetermined position so that the billet can pass through.   The billet holding device push-back device is provided in the pushing device driving chain after the billet has been inserted into the container so that the billet holding device can be moved to the initial position by the chain drive. The billet insertion device described in 1.   The billet insertion device according to claim 1, wherein the billet bottom surface of the billet insertion device is disposed slightly above the bottom surface of the container. Billet holding device that inserts the billet into the container by pushing the billet end face after the billet is transported to the press center by the billet supply device etc. when inserting the billet into the container hole at the center of the press with the rear loading type extrusion press In the billet insertion device consisting of the billet pushing device,
The billet end on the pushing side is pressed and held downward and can be moved in the direction of the container of the press. At the start of billet insertion, the pushing force is increased following the friction force acting between the billet and the container. A rotatable lever billet holding device,
The billet holding device and the billet pushing device are made integral so that the billet can be moved in the pushing direction while restraining the vertical direction of the billet and the downward holding force increases on the billet as the load acts on the pushing force. Billet insertion device.   9. The billet insertion device according to claim 8, wherein the billet bottom surface of the billet insertion device is disposed slightly above the bottom surface of the container.

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