JP2015208757A - Extrusion press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten high speed travel, in its turn, nonproduction time, for retreat motion by controlling a container, further, a main cross head hauled thereby, in a driving device of a conventional metal extrusion press.SOLUTION: An extrusion press comprises moving means of a container, and molds a section by extruding a billet filled in the container by a main cylinder device from a die by an extrusion stem, and when the container and the main cross head retreat, a head chamber of a container cylinder and a rod chamber of a side cylinder are connected, and a rod chamber of the container cylinder and a head chamber of the side cylinder are also connected, and are respectively communicated by a hydraulic line.

Description

  The present invention relates to a drive device for the backward movement of a container and a main cross head of a metal 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 hydraulic extrusion presses, efforts are made to reduce the non-production time as much as possible until the load on the extrusion press is removed, the billet remainder is separated, and a new billet is installed and pressed. Yes. In order to make this possible, the traveling speed of the container and the main crosshead must be increased. For this reason, the pump conveyance amount of the built-in high-pressure pump is not usually sufficient. Therefore, a special transport amount from an additional high pressure pump, auxiliary pump or additional accumulator is used for this high speed movement. The disadvantages in this case are that expensive equipment costs are required on one side and additional power must be consumed on the other side.

  After pressing the billet, the extrusion press must be returned to its initial position to ensure sufficient space to install a new billet. In that case, the container and the main crosshead must be retracted in parallel. This means that in a metal extrusion press having a cylinder device, the moving parts are moved to the billet mounting position simultaneously or sequentially in time. In known extrusion press cylinder devices, it is common to use a Run Arland circuit in order to reduce the transport amount and achieve a high speed, but this circuit is only used for high speed during advancement, Cannot be used for fast retreat.

  In Patent Document 1, when the die holder and the traveling cross member move backward at high speed, the pressure oil in the cylinder chamber on the piston surface side of the auxiliary cylinder of the traveling cross member is used as the cylinder on the ring surface side of the auxiliary cylinder unit of the die holder. Although it can be supplied to the chamber, when the die holder is traveling until it mechanically contacts the traveling cross member, and when the die holder and the traveling cross member move backward at high speed, the auxiliary cylinder of the die holder The pressure oil in the cylinder chamber on the piston surface side of the unit flows out to the tank through an open valve block via a tank conduit.

JP 2001-252714 A

In the drive device of the metal extrusion press, for the backward movement by controlling the container and the main cross head entrained by the container, it is possible to reduce the non-production time as well as the high speed running.
Moreover, in the invention of the cited document 1, since the head chamber of the drive cylinder of the container communicates directly with the tank, the speed control of the container is impossible. Also, when the container comes into contact with the main crosshead, the impact is great because of the violent collision. Furthermore, since the oil in the head chamber of the drive cylinder of the container is dropped into the tank, the energy loss is large.

In an extrusion press comprising a container moving means, and a billet loaded in the container by a main cylinder device is extruded from a die by an extrusion stem to form a profile,
When the container and the main crosshead are retracted, connect the head chamber of the container cylinder and the rod chamber of the side cylinder, and connect the rod chamber of the container cylinder and the head chamber of the side cylinder, and communicate with each other via hydraulic lines. did.

Since the main crosshead retraction operation starts simultaneously with the container retraction, the difference between the container retraction speed and the main crosshead retraction speed is adjusted to reduce the speed difference when contacting the container and the main crosshead, without using a shock absorber. Shock can be alleviated.
Also, after the container and the main crosshead come into contact with each other, the oil discharged from the head chamber of the side cylinder is used in the rod chamber of the container cylinder, so that high speed operation can be achieved without using an accumulator or another pump, so that the idle time can be shortened. .

1 is an overall schematic view of an extrusion press according to the present invention. It is the figure which displayed the flow of the pressure oil of the stage until the container starts retreating and contacts the main crosshead without shock. FIG. 6 is a diagram showing the flow of pressure oil when the container and the main crosshead are simultaneously retracted at a high speed. It is a hydraulic circuit of patent document 1. FIG.

  An embodiment of a method for simultaneously retreating a container and a main crosshead of an extrusion press according to the present invention at a high speed will be described below in detail with reference to the drawings.

First, the outline of the extrusion press of the present invention will be described with reference to FIG.
As shown in FIG. 1, in an extrusion press used in the present invention, an end platen 1 and a main cylinder 2 are arranged facing each other, and both are connected by a plurality of tie rods 3. A container 5 is disposed on the inner side surface of the end platen 1 with a die 4 formed with an extrusion hole interposed therebetween. A billet 6 is loaded into the container 5 and is extruded and pressed toward the die 4 to form a die hole. An extruded material having a corresponding cross section is extruded.

  The main cylinder 2 that generates the pushing action force has a built-in main ram 9 that can be pressurized and moved toward the container 5. At the front end portion of the main ram 9, the extrusion stem 7 is in close contact with a billet loading hole of the container 5, and a dummy block (not shown) is brought into close contact with the front end of the main ram 9 so as to protrude toward the container 5. 8 is attached. Therefore, when the main cylinder 2 is driven and the main cross head 8 is moved forward, the extrusion stem 7 is inserted into the billet loading hole of the container 5 and the rear end surface of the loaded billet 6 is pressurized to push the extruded material. is there.

  A plurality of side cylinders 10 are attached to the main cylinder 2 in parallel with the extrusion axis, and the cylinder rods 11 are connected to the main cross head 8. As a result, the extrusion stem 7 is initially moved to a position close to the container 5 as a preparation step of the extrusion step, and the extrusion pressure operation is performed using both the main cylinder 2 and the side cylinder 10.

When the extrusion is completed, only the container 5 is retracted first. This is to remove the discard.
Thereafter, when the container 5 and the main crosshead 8 are moved backward, the container 5 starts moving backward and comes into contact with the main crosshead 8 without shock, and the container 5 and the main crosshead 8 are simultaneously moved backward at high speed. Divided into two stages.

FIG. 2 shows the flow of pressure oil at a stage until the container 5 starts to move backward and comes into contact with the main crosshead 8 without shock.
Due to the high-speed backward movement of the container 5 and the main crosshead 8, the container 5 is first run until it mechanically contacts the main crosshead 8, as shown in FIG.
First, pressure oil is supplied from the hydraulic pump 25 to the rod chamber 13a of the container cylinder 13 of the container 5 through the connection conduit aL1 and the cartridge valve a31.
Since the head chamber 13b of the container cylinder 13 is connected to the rod chamber 10a of the main crosshead 8 side cylinder 10 by the connection conduit bL2, the pressure oil in the head chamber 13b of the container cylinder 13 is connected to the connection conduit bL2, the cartridge valve b32, the flow rate. It passes through the control valve a23 and is sent to the rod chamber 10a of the side cylinder 10 of the main crosshead 8.

When the pressure oil in the head chamber 13b of the container cylinder 13 is sent to the rod chamber 10a of the side cylinder 10, there is a difference between the area of the piston of the container cylinder 13 on the head side and the area of the piston of the side cylinder 10 on the rod side. The flow rate adjustment valve a23 adjusts, but the excess pressure oil passes through the cartridge valve c33 and falls into the tank T2.
Further, the pressure oil in the head chamber 10b of the side cylinder 10 of the main crosshead 8 falls into the tank T1 through the connection conduit L3 and the cartridge valve d34.
As described above, the container 5 and the main crosshead 8 can come into contact with each other at a low relative speed.

FIG. 3 shows the flow of pressure oil when the container 5 and the main crosshead 8 are simultaneously retracted at a high speed.
First, pressure oil is supplied from the hydraulic pump 25 to the rod chamber 13a of the container cylinder 13 of the container 5 through the connection conduit aL1 and the cartridge valve a31.
Since the head chamber 10b of the side cylinder 10 of the main crosshead 8 is connected to the rod chamber 13a of the container cylinder 13 of the container 5 via the connection conduit dL4, the cartridge valve e35, and the flow rate control valve b24, the main crosshead 8 The pressure oil in the head chamber 10b of the side cylinder 10 is supplied to the rod chamber 13a of the container cylinder 13 of the container 5 through the connection conduit L4, the cartridge valve e35, and the flow rate control valve b24.
When the pressure oil in the head chamber 10b of the side cylinder 10 is sent to the rod chamber 13a of the container cylinder 13, there is a difference between the area on the head side of the piston of the side cylinder 10 and the area on the rod side of the piston of the container cylinder 13. The flow rate adjustment valve b24 adjusts, but excess pressure oil passes through the cartridge valve 34d and falls into the tank T1.

Furthermore, since the head chamber 13b of the container cylinder 13 is connected to the rod chamber 10a of the main crosshead 8 side cylinder 10 by the connection conduit bL2, the pressure oil in the head chamber 13b of the container cylinder 13 is connected to the connection conduit bL2, the cartridge valve. 32 b and the flow rate control valve a <b> 23 are sent to the rod chamber 10 a of the side cylinder 10 of the main crosshead 8.
As described above, the container 5 and the main crosshead 8 are integrated and can be simultaneously retracted at a high speed.

The hydraulic circuit described in Patent Document 1 shown in FIG. 4 will be described.
For the high-speed backward movement of the die holder 5 and the traveling cross member 7, first, the die holder 5 is caused to travel until it mechanically contacts the traveling cross member 7. For this purpose, the auxiliary cylinder unit of the die is used. The cylinder chamber 9a on the ring surface side of the cylinder 9 is supplied with pressure oil from the pressure oil connecting portion P through the valve 13a through the connection conduit 14 or 15, and on the other hand, the cylinder chamber 9b on the piston surface side of the auxiliary cylinder unit 9 of the die. Is connected to the tank T via a tank conduit 16 through an open valve block 13c, so that the oil to be pushed out can flow into the tank.
In order to receive the pressure oil from the auxiliary cylinder unit 12 of the traveling cross member and to move the die holding body 5 and the traveling cross member 7 pushed back thereby at a high speed, the piston side of the auxiliary cylinder unit 12 of the traveling cross member The cylinder chamber 12a is connected to the cylinder chamber 12b on the ring surface side of the auxiliary cylinder unit 12 of the traveling cross member on one side through a common connection conduit 17, a valve block 13b, and a branch conduit 18 or 19 branched from this. On the other side, the valve 13a of the pressure oil supply part P is connected to the cylinder chamber 9a on the ring surface side of the auxiliary cylinder unit 9 of the die. Therefore, the oil flowing out from the cylinder chamber 12a on the piston surface side of the auxiliary cylinder unit 12 of the traveling cross member is returned to the pressure supply unit.

Since this invention is the above structure, the following effects are acquired.
Since the main crosshead retraction operation starts simultaneously with the container retraction, the difference between the container retraction speed and the main ram retraction speed is adjusted to reduce the speed difference between the container and the main crosshead contact. Mitigation is possible.
In addition, after the container and main crosshead contact, the oil discharged from the head chamber of the side cylinder is used in the rod chamber of the container cylinder, so that high speed operation can be achieved without using an accumulator or another pump, thus realizing energy saving and idle time. Shortening is possible.

DESCRIPTION OF SYMBOLS 1 End platen 2 Main cylinder 3 Tie rod 4 Dies 5 Container 6 Billet 7 Extrusion stem 8 Main cross head 9 Main ram 10 Side cylinder 10a Side cylinder rod chamber 10b Side cylinder head chamber 11 Side cylinder rod 12 Container holder 13 Container cylinder 13a Container cylinder rod chamber 13b Container cylinder head chamber 23 Flow control valve a
24 Flow control valve b
25 Hydraulic pump 31 Cartridge valve a
32 Cartridge valve b
33 Cartridge valve c
34 Cartridge valve d
35 Cartridge valve e
L1 Connection pipeline a
L2 connection line b
L3 connection line c
L4 connection line d

Claims (1)

In an extrusion press comprising a container moving means, and a billet loaded in the container by a main cylinder device is extruded from a die by an extrusion stem to form a profile,
When the container and the main crosshead are retracted, connect the head chamber of the container cylinder and the rod chamber of the side cylinder, and connect the rod chamber of the container cylinder and the head chamber of the side cylinder, and communicate with each other via hydraulic lines. Extrusion press characterized by that.

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