WO2013021782A1

WO2013021782A1 - Extrusion press

Info

Publication number: WO2013021782A1
Application number: PCT/JP2012/067843
Authority: WO
Inventors: 武治山本; 幸次中野
Original assignee: 宇部興産機械株式会社
Priority date: 2011-08-09
Filing date: 2012-07-12
Publication date: 2013-02-14
Also published as: JP2013035036A; JP5834611B2; US20140157852A1; CN103687679B; CN103687679A

Abstract

Provided is a short stroke type extrusion press which is capable of increasing a container strip force, improving energy efficiency, and saving space by reducing apparatus length. A main cylinder housing (4) of the extrusion press comprises a transfer medium (10) which advances or retreats an extrusion stem (13) in an extrusion axis direction, and a transfer medium (16) which advances or retreats a container (14) in the extrusion axis direction. A container pushing medium (21) is disposed at an end platen (1) disposed opposite the main cylinder housing (4) and makes it possible for at least four different transfer motions to be carried out independently or in collaboration with the container transfer medium in the direction in which the container (14) separates from a die (9).

Description

Extrusion press

CROSS REFERENCE TO RELATED APPLICATIONS The present invention is claimed based on the priority of Japanese Patent Application No. 2011-173675 dated August 9, 2011, the contents of which are incorporated herein by reference. Continue on.

The present invention relates to an extrusion press used for metal extrusion molding of an aluminum alloy or the like, and more particularly, to a short stroke type extrusion press with a shortened machine length to save space and to increase the functionality and idle time. The present invention relates to an extrusion press that is shortened.

Generally, when extruding materials (billets) made of metal materials such as aluminum or alloy materials thereof are extruded by an extrusion press, a stem is attached to the tip of a main ram driven by a hydraulic cylinder, and a container is placed on the die. In the pressed state, the extruded material (billet) is stored in the container by the storing means. Then, the main ram is further advanced by driving the hydraulic cylinder, whereby the extruded material (billet) is pushed out by the stem. Therefore, the molded product is extruded from the outlet of the die.

Fig. 2 shows the configuration of a conventional short stroke extrusion press with a reduced machine length to save space. In FIG. 2, reference numeral 1 denotes an end platen, 2 denotes a die slide having a die 9 for product extrusion, 3 denotes a container holder for holding a container 14 for storing an extruded material (billet) 12, 4 denotes a main cylinder housing, 5 denotes A main cylinder, 6 is a main ram, 7 is a main cross head integrally attached to the tip of the

main ram

6, and 10 is a side cylinder used for moving the main cross head 13 and provided on the left and right horizontal outer surface portions of the main cylinder 5. .

A stem slider 11 is attached to the tip of the main cross head 7 so as to be slidable in a horizontal direction perpendicular to the axial direction, which is the forward / backward direction of the main cross head 7. An extrusion stem 13 extending toward the end platen is attached to one end of the stem slider, and this extrusion stem 13 can be moved between a press center and a standby position of the extrusion stem deviated from the center position by a stem slide cylinder (not shown). It has become.
The extruded material (billet) 12 is supplied to a space formed by the movement of the extrusion stem by an extruded material (billet) supply means (not shown), and is stored in the container by the extruded material (billet) pushing means. ing.

In the container 14, one end portion of the container cylinder rod 15 is attached to the container holder 3, and the other end portion of the container cylinder rod 15 is connected to a container cylinder 16 provided on the vertical vertical outer surface portion of the main cylinder 5. The container 14 can be moved between the die 9 and the extrusion stem 13 by supplying pressurized oil to the container cylinder 16. (See Patent Document 1)

The container cylinder 16 moves forward to contact the die 9 and move forward to obtain a space for supplying the extruded material (billet) 12 to the gap formed by moving the extrusion stem side end surface of the container 14 and the extrusion stem 13; The back-and-forth operation in the deaeration process in which the compressed air remaining in the container 14 is discharged after upsetting, and the container 14 in which the shear blade 28 moves up and down when the discard is cut after the extrusion process is completed. The strip operation of the container 14 that secures a gap between the die side end surface and the die 9, and when the die 9 is replaced, the container 14 moves backward and the die slide 2 moves horizontally. The clearance is secured for the die slide operation. Furthermore, it operates also in the isobaric extrusion control for controlling the container sealing force, which decreases with the progress of the extrusion process, to be constant.

By the way, in the conventional extrusion press, the container cylinder 16 is attached to the main cylinder housing 4 in this way, so that the container strip force is increased due to the relationship between other parts in the extrusion press and the presence or absence of interference with other mechanisms. There is a problem in that it involves design strength and structural difficulties.
Further, since the above operation is performed by the container cylinder 16, there is a problem that a large amount of pressure oil is supplied to consume useless energy and the energy efficiency is poor.

JP-A-8-206727

The present invention has been made to solve the above-described problems, and provides a short stroke type extrusion press that increases the container strip force and saves space by reducing the length of the machine with improved energy efficiency. Objective.

In order to solve the above-described object, the extrusion press according to the first aspect of the present invention includes a moving means for moving the extrusion stem back and forth in the direction of the extrusion axis and a moving means for moving the container back and forth in the direction of the extrusion axis. In the extrusion press, the container pushing means that enables the container to move at least four different movements alone or in cooperation with the container moving means in a direction separating the container from the die is opposed to the main cylinder housing. It is characterized in that it is provided on the end platen that is arranged.

The extrusion press according to the second aspect of the present invention is the extrusion press according to the first aspect, wherein the four kinds of movement operations are a deaeration operation for discharging the compressed air in the container generated in the upset process, and an extrusion An isobaric extrusion operation that makes the container sealing force acting on the container constant during the process, a discard strip operation that pulls out a discard that is a billet pusher after the extrusion operation, and after completion of the extrusion cycle, It is a die opening operation in which a gap is provided between an end surface of the die that contacts when the die is exchanged and an end surface of the container.
The extrusion press according to a third aspect of the present invention is characterized in that, in the invention according to the first aspect, the pushing means of the container is constituted by a plurality of hydraulic cylinders having a smaller diameter than the moving means of the container. And

According to the present invention, since the hydraulic cylinder for assisting the movement of the container when moving the container in the backward direction is provided in the end platen, the design is facilitated without destroying the strength of the main cylinder housing, and the discard strip operation is performed. The container strip force for can be increased.
In addition, since the container pushing means uses a hydraulic cylinder having a smaller diameter than the container moving means, a small amount of pressure oil may be supplied when the container is moved backward, reducing the required power and improving the energy efficiency. be able to.

The present invention may be more fully understood from the following description of preferred embodiments of the present invention, together with the accompanying drawings.

It is a longitudinal cross-sectional view of the extrusion press explaining embodiment of this invention. It is a longitudinal cross-sectional view of the conventional extrusion press.

Hereinafter, the present invention will be described in detail with reference to FIG. FIG. 1 shows an embodiment of an extrusion press according to the present invention, where 1 is an end platen, 2 is a die slide having a die 9 for product extrusion, and 3 is a container 14 for holding an extruded material (billet) 12. Container holder, 4 is a main cylinder housing, 5 is a main cylinder, 6 is a main ram, 7 is a main crosshead integrally attached to the tip of the

main ram

6, and 10 is used to move the main crosshead 13. It is a side cylinder provided in the left and right horizontal outer surface portions.

A stem slider 11 is attached to the tip of the main cross head 7 so as to be slidable in a vertical or horizontal direction perpendicular to the axial direction, which is the forward / backward direction of the main cross head 7. An extrusion stem 13 extending toward the end platen is attached to one end of the stem slider 11, and the extrusion stem 13 is moved between the press center and the extrusion stem standby position deviated from the center position by a stem slide cylinder (not shown). It is possible.
The extruded material (billet) 12 is placed at the tip of the extruded material (billet) supply means (not shown), and is supplied to the space formed by the movement of the extrusion stem. Similarly, the extruded material (billet) supply means (not shown) It is configured to be accommodated in the container 14 by the pushing means of the extruded material (billet) 12 provided at the tip of the container.

In the container 14, one end of a container cylinder rod 15 is attached to the container holder 3, and the other end of the container cylinder rod 15 is connected to a container cylinder 16 provided on the vertical vertical outer peripheral surface of the main cylinder 5. The container 14 can be moved between the die 9 and the extrusion stem 13 by supplying pressurized oil to the container cylinder 16.
Reference numeral 21 denotes a container pushing means, and the assist cylinder 22 and the assist cylinder rod 23 constitute a main part. The assist cylinder 22 is attached to the end platen 1 so that the container 14 can be pushed in the direction of the extrusion stem 13 with the axial direction of the extrusion press symmetrical. Reference numeral 18 denotes a receiving seat for the assist cylinder rod 23 provided to extend to the container holder 3. The extrusion press includes a position detection unit (not shown) that detects the amount of movement of the container holder 3, and the assist cylinder 22 controls the container holder 3 to have a predetermined amount of movement to adjust the opening amount of the container holder 3. It has a configuration.

27, after the extrusion of the extruded material (billet) 14 is completed, the side cylinder 10 is operated to retract the extrusion stem 13, while the container cylinder 16 and the assist cylinder 22 are operated to retract the container 14, and the die 9 and the container 14 is a main shearing device that lowers the shear blade 28 into a gap with the material 14 and cuts and removes the discard, which is a pusher of the extruded material (billet) 12 (not shown), from the product.
In the discard strip operation, the extrusion stem 13 is held in position, only the container holder 3 is opened by a predetermined amount, and then the container holder 3 and the extrusion stem 13 are simultaneously retracted.
As described above, two assist cylinders 22 are provided so as to be diagonally opposed to the outer edge portion of the die 9. However, four assist cylinders 22 may be provided to push the container 14.

The operation of the container pushing means 21 in the extrusion press constructed as described above will be described.
In the degassing operation, after the extruded material (billet) 12 having a diameter slightly smaller than the inner diameter of the container is stored in the container 14 at the start of the extrusion process, the extruded material (billet) 12 is dies 9 by the extrusion stem 13 in the container 14. When the so-called upsetting is performed, the extruded material (billet) 12 is crushed and the air between the container 14 and the extruded material (billet) 12 is compressed. In order to release the compressed air, pressure oil is supplied to the head side of the assist cylinder 22 to retreat the container holder 3, retreat the extrusion stem 13, and the compressed air from the gap between the die 9 and the container 14. Unplug. At this time, the container holder 3 and the container cylinder rod 15 are pushed back by the assist cylinder rod 23. After releasing the compressed air, the container 13 and the extrusion stem 13 are advanced again by the container cylinder 16 and the side cylinder 10 to start the extrusion process.

In the extrusion process, since the length of the extruded material (billet) 12 in the container 14 is gradually shortened, the former usually has a larger extrusion force at the start of the extrusion process and at the end of the extrusion process. . That is, even if the extrusion resistance of the die 9 is constant, the frictional resistance between the container 14 and the extruded material (billet) 12 becomes smaller as the length of the extruded material (billet) 12 decreases. Will fall. This reduction in the pushing force causes a decrease in the container sealing force against the die 9, and the shape of the die 9 is deformed to change the dimensional shape of the product.
When the dimensional shape of the extruded product changes as described above, the isobaric extrusion operation supplies pressure oil to the head side of the assist cylinder 22 (and the rod side of the container cylinder), and moves the container holder 3 in the direction opposite to the extrusion. The container sealing force that acts excessively on the die 9 during the extrusion process from the start of extrusion is reduced, and the container sealing force that acts on the die 9 during the extrusion process is constant from the start of extrusion to the end of extrusion. Control to be.

After the extrusion process is completed by the discard strip operation, pressure oil is applied to the head side of the container cylinder 16 and the assist cylinder 22 while the side cylinder 10 is operated and the extrusion stem 13 is moved backward after the extrusion of the extruded material (billet) 12 is completed. Supply and operate, the container 14 is also retracted, and the discard is removed from the container 14. Then, the shear blade 28 is lowered into the gap between the formed die 9 and the container 14 to cut the discard. After cutting the discard, the shear blade 28 is moved upward.
When the discard is extracted from the container 14 (discard strip operation), both the assist cylinder 22 and the container cylinder 16 are used.

In the die opening operation, when the shape of the product is changed or the die 9 is worn and replaced, the die is moved horizontally together with the die slide 2. At this time, pressure oil is supplied to the head side of the assist cylinder 22 and the container housing 3 is moved backward to secure a gap between the die 9 and the container 14.
In the above four operations, the container holder 3 is moved backward by supplying pressure oil to the head side of the assist cylinder 22. The rod of the assist cylinder 22 may be pulled back by a method of supplying pressure oil to the rod side of the assist cylinder 22 or a method of pushing back through the container holder 3 with the container cylinder 16 moving forward.
The container strip force in the present invention is an acting force for extracting the discard from the container.

The stroke adjustment of the assist cylinder 22 is controlled based on the detection amount of a position detection means (not shown) that detects the movement amount of the container holder 3. For example, a stroke adjustment mechanism that can mechanically control the stroke of the assist cylinder 22. And a configuration controlled by a configuration that adjusts to a predetermined stroke for each operation.

As described above, in the extrusion press of the present invention, the end platen is provided with a plurality of assist cylinders that are smaller in diameter and smaller in output than the container cylinder that assists the container backward movement (movement toward the extrusion stem). .
For this reason, in the deaeration operation and the die opening operation with a small container moving load, the supply amount of the pressure oil necessary to move the container backward can be reduced, and energy saving and operation time can be shortened.
In addition, the container cylinder and the assist cylinder are configured to output in cooperation during the isobaric extrusion or discard strip operation where the moving load of the container is large, so that the design can be facilitated without impairing the strength of the main cylinder housing. The container strip force can be increased.

Although the present invention has been described with reference to particular embodiments selected for purposes of explanation, numerous modifications can be made without departing from the basic spirit and scope of the invention. It will be obvious to those skilled in the art.

1 End Platen 2 Die Slide 3 Container Holder 4 Main Cylinder Housing 5 Main Cylinder 6 Main Ram 7 Main Crosshead 9 Die 10 Side Cylinder 11 Stem Slider 12 Extruded Material (Billette)
13 Extrusion stem 14 Container 15 Container cylinder rod 16 Container cylinder 21 Container pushing means 22 Assist cylinder 23 Assist cylinder rod 27 Shear device 28 Shear blade

Claims

In an extrusion press provided with a main cylinder housing, a moving means for moving the extrusion stem back and forth in the direction of the extrusion axis, and a moving means for moving the container back and forth in the direction of the extrusion axis.
An end in which the container pushing means that enables at least four different kinds of moving operations in the direction of separating the container from the die or in cooperation with the container moving means is arranged to face the main cylinder housing. An extrusion press provided on a platen.
A deaeration operation for discharging the compressed air in the container generated in the upset process by the four types of movement operations;
An isobaric extrusion operation in which the container sealing force acting on the container during the extrusion process is constant;
A discard strip operation for extracting a discard which is a billet pusher from the container after the end of the extrusion operation;
2. The extrusion press according to claim 1, wherein after the extrusion cycle is completed, a die opening operation is performed in which a gap is provided between an end surface of the die abutted when the die is exchanged and an end surface of the container.
2. The extrusion press according to claim 1, wherein the container pushing means comprises a plurality of hydraulic cylinders having a smaller diameter than the container moving means.