JP2019141901A - Extrusion press device and main cross head retreat control method thereof - Google Patents

Abstract

To provide an extrusion press device capable of suppressing diameter increase of a cylinder, and arranging a container cylinder which can generate large output on a main cylinder housing, and a main cross head retreat control method thereof.SOLUTION: A container cylinder 128 is arranged in the surrounding of a main cylinder 12A of a main cylinder housing 12, a cylinder body of the container cylinder 128 comprises a plurality of oil chambers 51, 61 in a longitudinal direction of the cylinder rod 128A of the container cylinder 128, the cylinder rod 128A communicated to the oil chambers comprises piston parts 54, 64 for every oil chamber, which can slide in the longitudinal direction in the oil chamber. An extrusion press device 100 comprises a main cross head retreat hydraulic circuit 284 capable of optionally selecting a state, between a communication state in which, discharged hydraulic oil discharged from each oil chamber of the container cylinder 128 is supplied to a side cylinder 26, and a closed state in which the hydraulic oil is not supplied.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an extrusion press apparatus used for metal extrusion molding of an aluminum alloy or the like and a main crosshead retraction control method of the extrusion press apparatus.

  In general, an extrusion press apparatus for extruding an extruded material (billet) made of a metal material, such as aluminum or an alloy material thereof, is extruded through a main cross head at the tip of a main ram of a main cylinder that is driven forward by hydraulic pressure. Stem is installed. When extruding an extruded material with an extrusion press device, the extruded material stored in the container is moved forward while the container is pressed against a die arranged on the end platen side by a container cylinder or the like. The die is pressed (upset process). Then, by further advancing the main ram, the extruded material is pressed against the die by the extrusion stem, and a predetermined product is extruded from the die (extrusion process).

  In such extrusion molding by an extrusion press apparatus, a force for pressing a container with a container cylinder or the like on a die arranged on the end platen side is referred to as a container sealing force. The container sealing force is used to prevent the so-called “flower bloom phenomenon” in which the extruded material is pushed out from the end surface of the die and the front end surface of the container, not from the die, when the extruded material stored in the container is pressed by the extrusion stem. The force applied to the container by a hydraulic cylinder such as a container cylinder during the extrusion process.

  Here, the container sealing force will be described with reference to FIG. FIG. 1A is a schematic plan view (including a partial cross-section) for explaining a configuration around a container 18 of a conventional extrusion press apparatus in which a plurality of container cylinders 28 are arranged on the end platen 10 side. 1 (b) is a detailed view of part A of FIG. 1 (a). The container sealing force f that presses the container 18 against the die 16 is generated on the contact surface between the die 16 and the container 18 as shown in FIG. As shown in FIG. 1A, cylinder rods of a plurality of container cylinders 28 arranged on the end platen 10 side are connected to a container holder 19, and the container 18 fixed to the container holder 19 is connected to a die 16. It can be pressed.

  Further, as described above, the extrusion stem 24 that presses the extruded material 20 against the die 16 is disposed on the front end surface of the main cross head 22 so as to protrude toward the container 18 side, and the rear end surface of the main cross head 22 The one end side of the main ram 12B of the main cylinder 12A (not shown) is fixed, and the other end side is accommodated in the main cylinder 12A. The main cylinder 12A is disposed at the approximate center of a main cylinder housing 12 (not shown) disposed so as to face the end platen 10, and a plurality of side cylinders are disposed around the main cylinder 12A of the main cylinder housing 12. 26 (not shown) is arranged, and a cylinder rod 26 </ b> A of the side cylinder 26 is connected to the rear end surface of the main cross head 22. In this configuration, when the extrusion stem 24 and the main cross head 22 are advanced in the extrusion direction in the extrusion process or the upset process, both the main ram 12B and the side cylinder 26 are driven, and after the extrusion process is completed, the extrusion stem 24 When the main cross head 22 is moved backward, the side cylinder 26 is driven.

  The end platen 10 and the main cylinder housing 12 are connected by a tie rod 14. Although not shown, the tie rod 14 connects the four corners of the end platen 10 and the corresponding four corners of the main cylinder housing 12, and acts in a direction to separate the end platen 10 and the main cylinder housing 12 from each other during the extrusion process. It is comprised so that it may resist the force (reaction force of pressing action force) to do.

  On the other hand, when the extrusion material 20 accommodated in the container 18 is pressed against the die 16 by the extrusion stem 24 during the extrusion process, the extrusion material 20 is circumferentially moved in the container 18 by the pressing force applied to the extrusion material 20. Since the outer peripheral surface of the extruded material 20 comes into surface contact with the inner peripheral surface of the container 18 that stores the extruded material 20, the outer peripheral surface of the extruded material 20 and the extruded material 20 are stored during the extrusion process. A frictional force Fb is generated between the inner peripheral surface of the container 18. Therefore, the pushing action force F in the forward direction (direction approaching the end platen 10) to be applied to the extruded material 20 by the pushing stem 24 is the required pushing force Fa and frictional force acting on the die 16 via the extruded material 20. The sum with Fb, that is, F = Fa + Fb.

  The required pushing force Fa is an extrusion resistance force of the die 16 when the extruded material 20 is extruded from the die 16 in a state where the friction force Fb is not present, and the temperature of the extruded material 20 during the extrusion process varies. If not, it is substantially uniform during the extrusion process. On the other hand, the friction force Fb has the largest contact area between the extruded material 20 and the container 18 (the extruded material length L in the container 18 in the extrusion direction of the extruded material 20) at the start of the extrusion process (maximum extruded material length Lmax). The state is the largest (maximum frictional force Fbmax) and decreases in proportion to the decrease in the contact area (extrusion material length L) between the extruded material 20 and the container 18 as the extrusion process proceeds. The state where the contact area with the container 18 (extrusion material length L) is the smallest (minimum extrusion material length Lmin) is the smallest (minimum frictional force Fbmin). Therefore, as shown in FIG. 1C, the extrusion force F (Fa + Fbmax) at the start of the extrusion process decreases to Fa + Fbmin when the extrusion process is completed. The horizontal axis of FIG.1 (c) is the extrusion material length L of the extrusion material 20, and an origin is the maximum extrusion material length Lmax. Similarly, the vertical axis indicates the pushing force F.

  The reaction force Fb 'of the frictional force Fb between the extruded material 20 and the container 18 acts on the container 18 in the direction in which the container 18 is pressed against the die 16, that is, in the same direction as the container sealing force f. This reaction force Fb ′ is generally about 30% of the extrusion force F, and at least the maximum reaction force Fb′max of the maximum friction force Fbmax at the start of the extrusion process is a container that prevents the “flower bloom phenomenon”. This is a sufficient force as the sealing force f. Therefore, the container sealing force by the container cylinder 28 is applied only to the initial container sealing force necessary at the time of the upset process described above, and as shown in FIG. The container sealing force f to be applied is set to only the maximum reaction force Fb′max (f = Fb′max) of the pushing action force F, and the container sealing force by the container cylinder 28 is not applied.

  However, as described above, since the frictional force Fb (reaction force Fb ′) decreases with the progress of the extrusion process, as shown in FIG. 1D, the container sealing force f ( Fb′max) decreases to the minimum reaction force Fb′min if no container sealing force is applied by the container cylinder. The horizontal axis of FIG.1 (d) is the extrusion material length L similarly to FIG.1 (c), and a vertical axis | shaft shows the container sealing force f. Generally, the minimum reaction force Fb′min is insufficient as the container seal force f for preventing the “flower bloom phenomenon”, and therefore the container seal force f for preventing the “flower bloom phenomenon” is required. At the timing when the container sealing force f due to the reaction force Fb ′ decreases to the required container sealing force fc (extrusion material length L = Lc), the container cylinder 28 starts to apply (control) the container sealing force f. 1 (d), in the region C (shaded portion), the container sealing force f due to the decreasing reaction force Fb ′ is increased and corrected by the container cylinder 28, and the container sealing force f is set to f = fc until the extrusion process is completed. The container sealing force control method to hold is implemented.

  In order to implement the container sealing force control method described above, the container cylinder 28 includes a container separately from a hydraulic circuit from a main hydraulic oil supply source for moving the container 18 forward and backward relative to the end platen 10. A dedicated hydraulic circuit including a dedicated hydraulic oil supply source for supplying hydraulic oil to the cylinder 28 and pressure control means capable of controlling the pressure of the hydraulic oil supplied from the hydraulic oil supply source is provided. The hydraulic oil supply source for this container seal force control method is called a container seal pump.

  By such conventional container sealing force control, it is possible to prevent the “flower bloom phenomenon” that is likely to occur in the latter half of the extrusion process. However, the fluctuation (decrease) in the former pushing force F due to the fluctuation (decrease) in the friction force Fb and the fluctuation (decrease) in the latter container sealing force f are caused by the end platen through the die 16 during the extrusion process. 10 is arranged so as to cover the fluctuation of the bending amount of the end platen 10 having the extrusion opening 10A of the product to be extruded and extruded (mainly bending due to bending deformation), and the extrusion opening 10A of the end platen 10. Fluctuations in the amount of bending of the die 16 (deflection due to compression in the extrusion direction or bending deformation) are caused. This variation in the amount of deflection has the problems that the product obtained by extrusion molding has uneven thickness and shape in the longitudinal direction (extrusion direction), and deteriorates dimensional and shape accuracy.

  In view of the problems as described above, there are disclosed extrusion control apparatuses for extrusion press apparatuses and press press apparatuses that correct the container sealing force that fluctuates (decreases) and keep the container sealing force during the extrusion process substantially constant.

  For example, in Patent Document 1, a main cylinder housing and a hydraulic container cylinder are provided in a main cylinder housing, and a hydraulic assist cylinder that can move the container alone or in cooperation with the hydraulic container cylinder in a direction away from the die. An extrusion press apparatus including an end platen is disclosed. In this Patent Document 1, a container (container holder) is pressed to the opposite side to the extrusion direction by a hydraulic assist cylinder to reduce the container sealing force that acts excessively on the die during the extrusion process from the start of the extrusion process, An isobaric extrusion operation (isobaric extrusion control method) is disclosed in which the container sealing force acting on the die during the extrusion process is controlled to be constant from the start of extrusion to the completion of extrusion. (Patent Document 1, Paragraph 0019, etc.)

  The main difference between the isobaric extrusion control method described in Patent Document 1 and the conventional container seal control method described above is that the region B, which will be described later, has a configuration different from the container cylinder (hydraulic assist cylinder). ) Is only driven. The outline of the isobaric extrusion control method of Patent Document 1 will be described with reference to FIG. Like FIG.1 (d), the horizontal axis of FIG. 2 is extrusion material length L, and a vertical axis | shaft shows the container sealing force f.

  In the isobaric extrusion control method, the maximum reaction force Fb′max, which is the reaction force of the maximum frictional force Fbmax at the start of the extrusion process, acting in the same direction as the container seal force f is defined as the maximum container seal force fmax during the extrusion process. I reckon. Further, as described above, the reaction force Fb ′ decreases with the progress of the extrusion process. Therefore, the minimum reaction force Fb′min at the completion of extrusion is regarded as the minimum container sealing force fmin. Here, as shown in FIG. 2, a reference container sealing force 1 (fs1) is set between the maximum container sealing force fmax and the minimum container sealing force fmin. Needless to say, the reference container sealing force 1 (fs1) is a container sealing force capable of preventing the “flower bloom phenomenon”.

  Next, after the extrusion process is started, in the region B (shaded portion) where the reference container sealing force 1 (fs1) is smaller than the container sealing force by the reaction force Fb ′, the container is moved away from the die (counter-pressing direction). By pushing, the pushing force F is decreased and corrected so that the container sealing force f (reaction force Fb ′ in the region B) becomes the reference container sealing force 1 (fs1). In the isobaric extrusion control method of Patent Document 1, this decrease correction is performed by hydraulic control of hydraulic oil supplied to a hydraulic assist cylinder that can move the container in a direction away from the die.

  Further, in the region C (shaded area) where the container sealing force f due to the reaction force Fb ′ is smaller than the reference container sealing force 1 (fs1) as the extrusion process proceeds, the container sealing force control method is the same as in the container sealing force control method. By controlling the hydraulic pressure of the hydraulic oil supplied to the cylinder, the container seal force f itself is increased, and the container seal force f is increased and corrected so that the container seal force f becomes the reference container seal force 1 (fs1).

  In this way, the container sealing force f can be kept constant (reference container sealing force 1 (fs1)) during the extrusion process (region B and region C). That is, the difference between the isobaric extrusion control method and the container seal force control method is that in the region B, the container seal force f due to the reaction force Fb ′ is reduced.

JP 2013-035036 A

  In the isobaric extrusion control method as disclosed in Patent Document 1, the container sealing force acting on the die during the extrusion process is controlled so as to be constant from the start of extrusion to the completion of extrusion. A decrease in container sealing force accompanying the progress of the process can be prevented, and the so-called “flower bloom phenomenon” in which the extruded material is extruded from between the die end face and the container front end face, which often occurs in the latter half of the extrusion process, can be prevented. Further, in the conventional container sealing force control method, since the container sealing force is maintained substantially constant even in the region B after the start of the extrusion process in which the fluctuation of the container sealing force could not be corrected, the fluctuation of the deflection amount of the die 16 is changed. Is suppressed, and the thickness and shape non-uniformity in the longitudinal direction (extrusion direction) of the product obtained by extrusion molding and the deterioration of dimensional and shape accuracy can be suppressed.

  However, in such an isobaric extrusion control method, the container is separated from the die in the region B where the container sealing force f by the friction force Fb is larger than the reference container sealing force 1 (fs1) (counter-pressing direction). , And push-out force F is corrected to decrease. That is, in the region B, the reaction force of the pushing force F acting between the end platen 10 and the main cylinder housing 12 connected by the tie rod 14 is gradually decreased (fluctuated) from the increased state.

  That is, although the container sealing force f is kept constant, the reaction force of the pushing force F acting between the end platen 10 and the main cylinder housing 12 connected by the tie rods 14 in the region B during the pushing process. Continues to decrease from region B to the displacement points of region B and region C. As a result, during the extrusion process, the fluctuation (reduction) in the reaction force of the extrusion force F acting between the end platen 10 connected by the tie rod 14 and the main cylinder housing 12 propagates to the end platen 10 via the die 16. The variation of the bending amount of the end platen 10 (mainly bending due to bending deformation) and the bending amount of the die 16 (deflection due to compression or bending deformation in the extrusion direction) are caused, and there is a limit to the suppression of fluctuations of these bendings. There's a problem.

  In order to solve the above problem, in the form in which the container cylinder is arranged in the main cylinder housing as in the extrusion press apparatus disclosed in Patent Document 1, for example, the reference container sealing force 1 (fs1) shown in FIG. When approaching the maximum container seal force fmax (Fb′max) at the start of the extrusion process, the region B where the extrusion force F is reduced becomes narrower, and the region C where the container seal force f is increased becomes larger. Thereby, although the fluctuation | variation of an extrusion action force can be suppressed rather than the equal pressure press control method of patent document 1, in order to make a container sealing force increase more in the area | region C, the container cylinder arrange | positioned in a main cylinder housing is larger. It is necessary to change to a cylinder that can generate output.

  Conversely, when the reference container sealing force 1 (fs1) is as close as possible to the minimum container sealing force fmin at the time of completion of the extrusion process, the region B in which the pushing action force F is reduced becomes wider and the region in which the container sealing force f is increased. C becomes narrower. Thereby, although the fluctuation | variation of the extrusion action force F can be suppressed, in order to reduce the extrusion action force F in the area | region B, it is necessary to change the hydraulic assistance cylinder arrange | positioned to an end platen into the cylinder which can generate | occur | produce a bigger output. In addition, since the control is to further reduce the extrusion force F, it is not preferable from the viewpoint of energy efficiency. Moreover, since the container sealing force f is reduced as a result, the occurrence of a flowering phenomenon is also a concern.

  Here, in the form in which the container cylinder is arranged in the main cylinder housing as in the extrusion press apparatus of Patent Document 1, as shown in FIG. 3, the main cylinder 12A is arranged in the approximate center of the main cylinder housing 12, A plurality of side cylinders 26 for moving the main cross head forward and backward are disposed around the periphery. Further, tie rods 14 are arranged at the four corners of the main cylinder housing 12. FIG. 3 is a schematic front view of the main cylinder housing 12 side of the extrusion press apparatus of Patent Document 1 in which the container cylinder is disposed in the main cylinder housing.

  In this embodiment, the specification paragraph 0007 of Patent Document 1 states that, in a conventional extrusion press apparatus in which a container cylinder is disposed in a main cylinder housing, “the container cylinder 16 is thus attached to the main cylinder 4. There is a problem that increasing the container strip force due to the relationship between the presence of interference between other parts in the extrusion press and other mechanisms, etc. has the problem of design strength and structural difficulties. ” Regarding the strip force, there is a description (specification paragraph 0021 of Patent Document 1) of “acting force in a direction in which the container is pulled away from the die (reverse extrusion)”.

  That is, in this embodiment, when the container cylinder is changed to a cylinder capable of generating a larger output regardless of the container sealing force or the container strip force, the adjacent tie rods 14 around the main cylinder 12A. Since it is necessary to arrange the plurality of container cylinders 28 while avoiding the plurality of side cylinders 26, the container cylinder 28 has a cylinder diameter capable of generating a sufficient output due to at least arrangement restrictions. There is a problem that it is difficult to configure and dispose the main cylinder housing 12.

  On the other hand, if the main cylinder housing 12 is enlarged, the container cylinder 28 having a cylinder diameter capable of generating a sufficient output can be arranged. However, the container holder 19 and other related parts are also greatly increased. Need to be rigid.

  In addition, as described above, the container sealing force that is originally required during the extrusion process is sufficiently large at the start of the extrusion process because the maximum reaction force Fb′max of the maximum frictional force Fbmax of the extrusion force F is sufficient. As the force Fb ′ decreases, it is sufficient that the container sealing force necessary to prevent “decrease in flower bloom” can be applied. Further, during the period from the completion of the extrusion process to the start of the next extrusion process (idle time), the extruded material (discard) remaining in the container 18 is discharged from the container 18 and the new extruded material 20 is stored in the container 18. Therefore, the container 18 needs to be moved back and forth with respect to the end platen 10 (see FIG. 1), and in order to shorten the idle time for improving productivity, the drive speed of the container cylinder is given priority over its output. A smaller cylinder diameter is preferable. Therefore, it is not necessary to increase the cylinder diameter of the container cylinder in order to increase the output of the container cylinder. In the isobaric extrusion control method, in order to reduce and correct the extrusion force F in the region B, In general, the following configuration (Patent Document 1: Hydraulic assist cylinder) is employed.

  Further, in the conventional extrusion press apparatus as described with reference to FIG. 1, since the main cross head 22 is moved backward by the side cylinder 26, the total amount of discharged hydraulic oil discharged from the container cylinder 28 when the container 18 is moved backward. May be supplied to the side cylinder 26. However, from the viewpoint of giving priority to the driving speed, it is preferable that the cylinder diameter of the container cylinder is small, and since it is less necessary to increase the cylinder diameter of the container cylinder, until the container 18 reaches the retreat limit position. In addition, the volume of the discharged hydraulic oil discharged from the container cylinder 28 is generally smaller than the volume of the supplied hydraulic oil required for the main cylinder head 22 to reach the retreat limit position by the side cylinder 26. there were. Therefore, after the container 18 reaches the reverse limit position, the hydraulic circuit is switched to supply the hydraulic oil from the main hydraulic oil supply source to the side cylinder 26, and the main crosshead 22 that has not reached the reverse limit position. It is necessary to retreat to the retreat limit position again, and it is difficult to shorten the time required for retreating the main crosshead 22 to the retreat limit position (main crosshead retraction process).

  The present invention has been made in view of the above-described problems. A container cylinder capable of generating a large output while suppressing an increase in cylinder diameter is disposed in a main cylinder housing, and a large container seal is provided. It is an object of the present invention to provide an extrusion press apparatus capable of obtaining a force and a container split force, and a method for controlling the backward movement of a main crosshead using the extrusion press apparatus.

The above object of the present invention is to provide an end platen,
A main cylinder housing that is arranged to face the end platen and is connected to the end platen by a plurality of tie rods;
A main cylinder disposed substantially in the center of the main cylinder housing;
A main cross head disposed between the end platen and the main cylinder housing and having an extrusion stem disposed so as to protrude from a front end surface;
A main ram that has one end fixed to the rear end surface of the main cross head, the other end is housed in the main cylinder, and advances the main cross head to approach the end platen;
A plurality of side cylinders disposed around the main cylinder of the main cylinder housing, wherein the main crosshead is moved forward to approach the end platen or moved backward from the end platen;
A container that is disposed between the end platen and the main crosshead, and stores the extruded material;
A plurality of container cylinders for advancing the container toward the end platen or retracting the container away from the end platen;
An extrusion press apparatus comprising:
The container cylinder is disposed around the main cylinder of the main cylinder housing;
The cylinder body of the container cylinder includes a plurality of oil chambers in the longitudinal direction of the cylinder rod of the container cylinder, and the cylinder rod communicating with the oil chamber is slid in the longitudinal direction in the oil chamber for each oil chamber. A movable piston part is formed,
In the oil chamber, a divided oil chamber that is divided into two in the longitudinal direction by the piston portion is formed,
When the container is retracted by the container cylinder, discharged hydraulic oil is discharged from each oil chamber of the container cylinder.
A main crosshead retraction hydraulic circuit capable of arbitrarily selecting a communication state to be supplied to the side cylinder and a closed state not to be supplied to the side cylinder for the retraction of the main crosshead by the side cylinder; It is achieved by an extrusion press apparatus characterized by the following.

Further, in the extrusion press device according to the present invention, the container cylinder is discharged from each oil chamber of the container cylinder while the container cylinder is moved back from the forward limit position to the reverse limit position of the container. The total volume of oil is
Approximately the same as the volume of the supply hydraulic oil necessary to move the extrusion stem and the main cross head at the push forward limit position to the reverse limit position of the main cross head by the side cylinder, or the supply hydraulic oil The container cylinder is preferably configured to be larger than the volume of the container cylinder.

On the other hand, in the extrusion press device according to the present invention, an extrusion press device including the main crosshead retraction hydraulic circuit as described above,
While the container is retracted from the forward limit position to the backward limit position of the container by the container cylinder, the total volume of discharged hydraulic oil discharged from each oil chamber of the container cylinder is:
Approximately the same as the volume of the supply hydraulic oil necessary to move the extrusion stem and the main cross head at the push forward limit position to the reverse limit position of the main cross head by the side cylinder, or the supply hydraulic oil In the extrusion press device in which the container cylinder is configured to be larger than the volume of
A container reverse preparation step of closing a hydraulic circuit for supplying hydraulic oil from a hydraulic oil supply source to the side cylinder after completion of the extrusion step, and bringing the closed state of the main crosshead reverse hydraulic circuit into a communicating state;
After the container retreat preparation step, supply a working oil from the working oil supply source to the container cylinder to retreat the container to a retreat limit position;
A main crosshead that retracts the main crosshead to a retreat limit position by supplying hydraulic oil discharged from the container cylinder in the container retraction process to the side cylinder via the main crosshead retraction hydraulic circuit. Retreating process,
Including
You may perform the main cross head retreat control method which completes the said main cross head retraction process substantially simultaneously with completion of the said container retraction process, or before the completion of the said container retraction process.

In the extrusion press device according to the present invention, the cylinder body of the container cylinder includes a plurality of oil chambers in the longitudinal direction of the cylinder rod of the container cylinder, and the cylinder rod communicating with the oil chamber is provided for each oil chamber. A piston portion that is slidable in the longitudinal direction in the oil chamber is formed,
In the oil chamber, a divided oil chamber that is divided into two in the longitudinal direction by the piston portion is formed, so that a container cylinder capable of generating a large output while suppressing an increase in cylinder diameter is provided as a main cylinder housing. It is possible to obtain a large container sealing force and container splitting force. Further, the volume of the discharged hydraulic oil discharged from the container cylinder 28 is increased until the container 18 reaches the retreat limit position, and the hydraulic oil discharged from the container cylinder in the container retreat process is supplied to the main cloth. By supplying the side cylinder via the head retraction hydraulic circuit, the main crosshead retraction process is completed substantially simultaneously with the completion of the container retraction process or before the completion of the container retraction process. The time required for the crosshead retracting process can be shortened.

A schematic plan view (including a partial cross-section) for explaining a configuration around a container of a conventional extrusion press apparatus in which a container cylinder is disposed on the end platen side, and fluctuations in the extrusion process of the extrusion acting force F and the container sealing force f It is a graph which shows. 6 is a graph for explaining the isobaric extrusion control method of Patent Document 1. It is a schematic front view of the main cylinder housing of the extrusion press apparatus of patent document 1. It is a schematic plan view (a partial cross section is included) of the extrusion press apparatus which concerns on 1st Embodiment. It is a schematic sectional drawing of the container cylinder of the extrusion press apparatus which concerns on 1st Embodiment. It is a schematic hydraulic circuit diagram for performing an isobaric extrusion control method by the extrusion press apparatus concerning a 1st embodiment, and a graph for explaining an isobaric extrusion control method. It is a schematic hydraulic circuit diagram for performing the main crosshead retreat control method with the extrusion press apparatus which concerns on 2nd Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

[First Embodiment]
First, the main configuration of the extrusion press apparatus according to the first embodiment will be described with reference to FIG. FIG. 4 is a schematic plan view (including a partial cross-section) of the extrusion press apparatus according to the first embodiment. The same reference numerals as those in FIG. 1 are given to the same components as those in FIG.

  The extrusion press apparatus 100 according to the first embodiment is arranged so as to face the end platen 10, the end platen 10, and connected to the end platen 10 by a plurality of tie rods 14, and the main cylinder housing 12. Main cylinder 12A arranged at the approximate center. Also, the main cross head 22 is disposed between the end platen 10 and the main cylinder housing 12 and the extrusion stem 24 is disposed so as to protrude from the front end surface, and one end side is fixed to the rear end surface of the main cross head 22 and the other end And a main ram 12B which is housed in the main cylinder 12A and advances the main cross head 22 so as to approach the end platen 10.

  Further, a plurality of side cylinders 26 arranged around the main cylinder 12 </ b> A of the main cylinder housing 12 to advance the main crosshead 22 so as to approach the end platen 10 or to retract so as to be separated from the end platen 10. The container 18 disposed between the end platen 10 and the main cross head 22 and storing the extruded material 20 and the container 18 fixed to the container holder 19 are advanced to approach the end platen 10 or end. A plurality of container cylinders 128 that are retracted away from the platen 10.

  The main difference between the extrusion press apparatus shown in FIG. 1 and the extrusion press apparatus 100 according to the first embodiment is that a container cylinder 128 is disposed in the main cylinder housing 12 and is attached to the end platen 10 during the extrusion process. The point is that the container 18 is pushed forward from the main cylinder housing 12 side to the arranged die 16.

  Here, the configuration of the container cylinder 128 of the extrusion press apparatus 100 according to the first embodiment will be described with reference to FIG. FIG. 5 shows a state in which the cylinder rod 128A of the container cylinder 128 is retracted to the retract limit position. The container cylinder 128 includes a plurality of oil chambers in the longitudinal direction of the cylinder rod 128A, and a piston portion that can slide in the longitudinal direction in the oil chamber is formed for each oil chamber in the cylinder rod 128A communicating with the oil chamber. At the same time, a divided oil chamber is formed in the oil chamber that is divided into two in the longitudinal direction by the piston portion.

  Specifically, the container cylinder 128 includes two oil chambers 51 and 61 that are continuous from the container 18 side (front) in the longitudinal direction of the cylinder rod 128A, and the cylinder rod 128A that communicates with each oil chamber. Is configured such that a rod portion 52 communicating with the front oil chamber 51 and a rod portion 62 communicating with the rear oil chamber 61 are connected on the oil chamber 51 side by a screwed structure or the like. The front oil chamber 51 is formed in the cylinder body 53 through which the rod portion 52 penetrates the front, and the rear oil chamber 61 is formed in the cylinder body 63. Then, the rear opening part of the cylinder body 53 and the front opening part of the cylinder body 63 are fixed to the connecting part 71 so as to face each other, and the rod part 62 communicating with the oil chamber 61 is passed through the connecting part 71, so that the oil chamber 51 The oil chamber 61 is formed as an independent oil chamber.

  On the other hand, a piston portion 54 that divides the oil chamber 51 into two in the longitudinal direction is attached and formed on the outer peripheral surface of the connecting portion by a screwed structure or the like at the connecting portion of the rod portion 52 and the rod portion 62 on the oil chamber 51 side. Is done. A piston portion 64 that divides the oil chamber 61 in the longitudinal direction is attached and formed at the rear end of the rod portion 62 by a screwed structure or the like. A seal fixing member 55 for fixing a seal member or the like for the rod portion 52 is attached to the front of the cylinder body 53, and the rear opening of the cylinder body 63 is used for blocking the opening and fixing the seal member. A member 65 is attached.

  In the above configuration, for the sake of explanation, the front (the rod part 52 side) of the oil chamber 51 is referred to as a divided oil chamber 56A, and the rear (between the piston part 54 and the connecting part 71) is referred to as a divided oil chamber 56B. Similarly, the front (the rod part 62 side) of the oil chamber 61 divided into two in the longitudinal direction by the piston part 64 is called a divided oil chamber 66A, and the rear (between the piston part 64 and the closing member 65) is called a divided oil chamber 66B. . Then, it is assumed that hydraulic pipes are connected to the divided oil chambers of the oil chamber 51 and the oil chamber 62 that are divided into two in the longitudinal direction by the piston portion 54 and the piston portion 64. That is, when the container 18 is advanced / pressed, the hydraulic oil is supplied to at least one of the divided oil chamber 56B and the divided oil chamber 66B, and when the container 18 is moved backward, at least one of the divided oil chamber 56A and the divided oil chamber 66A. One side is supplied with hydraulic oil. FIG. 5 is an example of a specific structure of the container cylinder 128, and the structure of the container cylinder 128 is not limited to the structure shown in FIG. Further, in order to simplify the drawing, in FIG. 5, illustration of a seal member, a screw-in structure, and a fixing member (bolt or the like) is omitted.

  In the extrusion press apparatus 100 according to the first embodiment, the container cylinder having the above-described configuration suppresses an increase in the cylinder diameter while ensuring a large total pressure receiving area of the plurality of oil chambers. By supplying hydraulic oil to all of the oil chambers, it becomes possible to generate a large output, and the container cylinder can be arranged in the main cylinder housing even if there are restrictions on arrangement. As a result, in the extrusion press apparatus 100 according to the first embodiment, a large container sealing force and container split force can be obtained. Further, by supplying hydraulic oil to one of the plurality of oil chambers, the container cylinder can be driven without increasing the amount of supplied hydraulic oil.

  In the extrusion press apparatus 100 according to the first embodiment, in the container seal force control method described above with reference to FIG. 2, the reference container seal force f ′ shown in FIG. It becomes possible to approach the sealing force fmax (Fb ′), and fluctuations in the extrusion acting force F can be suppressed as compared with the conventional container sealing force control method.

  On the other hand, in the extrusion press apparatus 100 according to the first embodiment, the pressure of hydraulic oil in the main cylinder 12A or the pressure of hydraulic oil supplied to the main cylinder 12A when the main cross head 22 is advanced is detected. The pressure detecting means 81 and the container 18 are moved forward by the container cylinder 128, and the hydraulic oil is supplied to each oil chamber of the container cylinder 128. By providing the hydraulic circuit 84 for isobaric extrusion control including the pressure control means 83, the isobaric extrusion control method in which fluctuations in the pushing force F are further suppressed as compared with the isobaric extrusion control method of Patent Document 1. is there. This will be described with reference to FIG.

  As described above, the above configuration is a dedicated hydraulic circuit different from the hydraulic circuit from the main hydraulic oil supply source for moving the container 18 forward and backward, and is used for the above-described isobaric extrusion control. The hydraulic oil supply source 82 may be considered as the container seal pump described above. The hydraulic oil supply source 82 for controlling isobaric extrusion is not used only in the case of the isobaric extrusion control method during the extrusion process, and is driven together with the main hydraulic oil supply source in other than the extrusion process. However, in FIG. 6A, in order to simplify the hydraulic circuit, the main hydraulic oil supply source and the hydraulic circuit from the supply source are not shown. FIG. 6A is a schematic hydraulic circuit diagram for performing the isobaric extrusion control method by the extrusion press apparatus according to the first embodiment, and FIG. 6B is a diagram for explaining the isobaric extrusion control method. It is a graph. In FIG. 6B, the horizontal axis represents the extruded material length L, and the vertical axis represents the container sealing force f.

  In the extrusion process, when the extrusion stem 24 is advanced and the extruded material 20 stored in the container 18 is pushed out from the die 16, as shown in FIG. 6A, the main cylinder 12A and the side cylinder 26 are not shown. Actuation of pressure and discharge rate required to advance the extrusion stem 24 and the main crosshead 22 from the main hydraulic oil supply source (one or more hydraulic pumps) with the desired extrusion force F and the desired extrusion speed. Oil is supplied.

  At the start of the extrusion process, the container sealing process for advancing the container 18 by the container cylinder 128 and pressing the container 18 against the die 16 has already been completed. Therefore, the divided oil chamber 56B and the divided oil chamber 56B of the container cylinder 128 are filled with the hydraulic oil at a pressure according to the initial container seal force, and the container seal force f can be controlled by the hydraulic circuit 84 for controlling the equal pressure extrusion. It is in.

  First, at the start of the extrusion process, it was detected by the pressure detection means 81 (pressure sensor such as a pressure pickup) disposed in the oil chambers of the main cylinder 12A and the side cylinder 16 and the hydraulic circuit that supplies hydraulic oil to them. The actual extrusion acting force at the start of extrusion based on the pressure at the start of extrusion is calculated from the pressure at the start of extrusion of the hydraulic oil. Further, the force exerted on the die 16 through the container 18 by the actual pushing action force at the start of pushing, that is, the maximum frictional force Fbmax (= the maximum reaction force Fb ′ between the extruded material 20 and the container 18 due to the pushing action force F. max) is also calculated, and this maximum reaction force Fb′max is set as the reference container seal force 2 (fs2) (reference container seal force setting step). These calculations are performed by the controller 85.

  Subsequently, during the extrusion process, the actual extrusion action force during extrusion based on the during-extrusion pressure of the hydraulic oil detected by the pressure detection means 81, and the friction force Fb (= reaction force Fb during extrusion) due to the actual extrusion action force during extrusion. ') Is also calculated, and the reaction force Fb' is set as a container sealing force fex during extrusion, and a reduced container sealing force fd which is a difference between the container sealing force fex during extrusion and the reference container sealing force fs is calculated (decreasing container seal). Force calculation step). These calculations are also performed by the controller 85. For example, the reduced container seal force calculation step will be described with reference to FIG. 6B. The reaction force Fb ′ at the time when the extruded material length L is L1 is set as the container seal force fex during extrusion (fex = Fb ′), The controller 85 calculates a reduced container seal force fd (fd = fs2-fex), which is a difference between the container seal force fex during extrusion and the reference container seal force 2 (fs2). This reduced container sealing force fd is substantially the same as the reduction amount (Fbmax−Fb or Fb′max−Fb ′) of the frictional force Fb or the reaction force Fb ′ that decreases during the extrusion process.

  The container seal, which is the supply pressure of hydraulic oil to the container cylinder 128, can apply the force in the forward direction substantially the same as the reduced container seal force fd calculated by the reduced container seal force calculation step to the container 18 by the container cylinder 128. The force complement pressure Pa is calculated by the controller 85 (container seal force complement pressure calculating step).

  The isobaric extrusion control method of the extrusion press apparatus 100 according to the first embodiment is the isobaric extrusion control with the container seal force complementary pressure Pa calculated in real time by such steps in the isobaric extrusion controlling hydraulic circuit 84. The pressure control means 83 for isobaric extrusion control is controlled such that hydraulic oil is supplied from the hydraulic oil supply source 82 to each oil chamber (the divided oil chamber 56B and the divided oil chamber 66B) of the container cylinder 128. The isobaric extrusion control hydraulic oil supply source 82 is preferably a variable discharge hydraulic pump, and the isobaric extrusion control pressure control means 83 is a pressure control device capable of controlling the hydraulic circuit hydraulic pressure in real time, For example, a proportional electromagnetic relief valve or the like may be employed.

  In the extrusion press apparatus 100 according to the first embodiment, the reaction force Fb ′ (decreasing container) that decreases due to the extrusion acting force F that decreases from the start to the completion of the extrusion process by performing the above-described isobaric extrusion control method. The sealing force fd), that is, the region D shown in FIG. 6B can be corrected for increase by the container cylinder 128 to which the hydraulic oil having the container sealing force complementary pressure Pa is supplied. As a result, the container sealing force f can be kept substantially constant (reference container sealing force fs (= Fb′max)) during the extrusion process.

  Further, in the above-described equal pressure extrusion control method, the region D (shaded portion / = decreasing container seal force fd) shown in FIG. 6B is transferred to the main cylinder housing by the container cylinder 128 arranged in the main cylinder housing 12. From the 12th side, the container 18 is pressed against the die 16 to increase correction. As described above, the reduced container sealing force fd is substantially the same as the reduction amount (Fbmax−Fb) of the frictional force Fb that decreases during the extrusion process, and the reaction force that acts on the container cylinder 128 when the increase is corrected is , Acting between the end platen 10 and the main cylinder housing 12.

  That is, since the decrease in the extrusion force F that decreases during the extrusion process and the substantially same force that acts in the same direction are increased and corrected in the above-described isobaric extrusion control method, the end platen 10 and the The force acting between the main cylinder housings 12 (reaction force of the pushing action force F) is also kept substantially constant. In other words, in the above-described isobaric extrusion control method, the region D (= decreasing container seal force fd) shown in FIG. 6B is increased and corrected, and the extrusion force F shown in FIG. In the graph showing the fluctuation in the process, the extrusion force F (Fa + Fbmax) at the start of the extrusion process is maintained until the extrusion process is completed.

  As a result, the extrusion force F propagated to the end platen 10 through the die 16 is maintained substantially constant during the extrusion process (the fluctuation of the extrusion force F is eliminated), so that the bending amount (mainly curved deformation) of the end platen 10 is eliminated. ) And the bending amount of the die 16 (deflection in the extrusion direction due to compression or bending deformation) are also maintained until the end of the extrusion process. Thereby, the thickness and shape non-uniformity in the longitudinal direction (extrusion direction) of the product obtained by extrusion molding, and the deterioration of dimensional / shape accuracy are further suppressed than the isobaric extrusion control method of Patent Document 1. Can do.

  FIG. 6 is a schematic hydraulic circuit diagram for performing the isobaric extrusion control method by the extrusion press apparatus according to the first embodiment, and therefore, only the major valves and pressure control devices that are considered necessary for explanation are denoted by reference numerals. Granted and explained. Accordingly, all hydraulic equipment necessary for the actual hydraulic circuit is not described, and for the valves that are not provided with reference numerals, “open” and “closed” are illustrated in FIG. I stopped it.

[Second Embodiment]
Next, an extrusion press apparatus according to the second embodiment and a main crosshead retraction control method of the extrusion press apparatus will be described with reference to FIG. FIG. 7 is a schematic hydraulic circuit diagram for performing the main crosshead retraction control method by the extrusion press apparatus according to the second embodiment. The extrusion press apparatus 200 itself according to the second embodiment includes the configuration and basics of the extrusion press apparatus 100 (FIGS. 4 and 5) according to the first embodiment, including the configuration of the container cylinder 128 disposed in the main cylinder housing 12. Are the same. Therefore, configurations that are the same as or similar to those in FIGS. 4 and 5 are given the same reference numerals as those in FIGS.

  The main difference between the extrusion press apparatus 200 according to the second embodiment and the extrusion press apparatus 100 according to the first embodiment is not an apparatus itself but a hydraulic circuit that drives the apparatus. Specifically, when the container 18 (container holder 19) is retracted by the container cylinder 128, the discharged hydraulic oil discharged from the oil chambers (the oil chamber 51 and the oil chamber 61) of the container cylinder 128 is supplied to the main by the side cylinder 26. A main crosshead retraction hydraulic circuit 284 is provided which can arbitrarily select a communication state supplied to the side cylinder 26 and a closed state where the crosshead 22 is not supplied for the retraction of the crosshead 22.

  In the extrusion press apparatus 100 according to the second embodiment, after the extrusion process is completed, the time required for retracting the container 18, the extrusion stem 24, and the main crosshead 22 for the next extrusion process is set as a feature of the container cylinder 128. A main crosshead retraction control method that shortens by utilizing the above is possible.

  After completion of the extrusion process, the container 18 and the main cross head 22 (extrusion stem 24) are moved backward to expose the extruded material 20 (discard) remaining in the container 18 to the end face of the die 16. Next, a shearing device (discard cutting device) or the like (not shown) is lowered from above between the die 16 and the container 18 to remove the discard exposed on the end surface of the die 16. Then, the main crosshead 22 is retracted to the retreat limit position (main crosshead retracting process), and preparation for storing the new extruded material 20 in the container 18 is performed.

  Specifically, first, a hydraulic circuit that supplies hydraulic oil from the main pump 282 (usually a plurality of units) that is a main hydraulic oil supply source to the side cylinder 26 is closed by closing the valve 201C. The closed state of the reverse hydraulic circuit 284 is brought into a communication state by opening the valve 201B (container reverse preparation step). Next, in order to secure a space length for supplying a new extruded material 20 between the container 18 and the extrusion stem 24, the valve 201A is opened, and the divided oil chamber 56A (oil chamber 51) of the container cylinder 28 from the main pump 282 is opened. Then, hydraulic oil is supplied to the divided oil chamber 66A (oil chamber 61), and the container 18 is retracted to the retract limit position (container retracting step). In order to increase the retreating speed of the container 18, hydraulic oil is supplied from the main pump 282 to only one of the divided oil chambers 56A (oil chamber 51) and the divided oil chamber 66A (oil chamber 61) of the container cylinder 28. And a tank line (not shown) may be opened in the other divided oil chamber so that the working oil is sucked from the working oil tank.

  At this time, because the main crosshead retraction hydraulic circuit 284 is in communication, all of the hydraulic fluid discharged from the two oil chambers of the container cylinder 128 passes through the valve 201B, The main cross head 22 is moved backward by being supplied to the oil chamber on the rod side.

  As described above, in the conventional extrusion press apparatus as described with reference to FIG. 1, the main crosshead 22 is moved backward by the side cylinder 26, so that the container 18 is discharged from the container cylinder 28 during the backward movement. In some cases, the entire amount of discharged hydraulic oil is supplied to the side cylinder 26. However, from the viewpoint of giving priority to the driving speed, it is preferable that the cylinder diameter of the container cylinder is small, and since it is less necessary to increase the cylinder diameter of the container cylinder, before the container 18 reaches the retreat limit position, Generally, the volume of the discharged hydraulic oil discharged from the container cylinder 28 is smaller than the volume of the supplied hydraulic oil necessary for the main cylinder head 22 to reach the retreat limit position by the side cylinder 26. . Therefore, after the container 18 reaches the reverse limit position, the hydraulic circuit is switched to supply the hydraulic oil from the main hydraulic oil supply source to the side cylinder 26, and the main crosshead 22 that has not reached the reverse limit position. It is necessary to retreat to the retreat limit position again, and it is difficult to shorten the time required for retreating the main crosshead 22 to the retreat limit position (main crosshead retraction process).

  On the other hand, the container cylinder 128 of the extrusion press apparatus 200 of the second embodiment has been described in the first embodiment in order to enable generation of a large output while suppressing an increase in the cylinder diameter. Due to the characteristics, the volume of the discharged hydraulic oil discharged from the container cylinder 28 can be significantly increased as compared with the conventional extrusion press apparatus. Therefore, the time required for the main crosshead retreating process can be shortened by retracting the main crosshead 22 to a position closer to the retreat limit position before the container 18 reaches the retreat limit position.

  Further, the container cylinder 128 of the extrusion press apparatus 200 according to the second embodiment causes the main crosshead 22 to reach the retreat limit position by the side cylinder 26 with the volume of the discharged hydraulic oil discharged from the container cylinder 28. By being configured to be substantially the same as the volume of the required supply hydraulic oil or larger than the volume of the supply hydraulic oil, the main crosshead reverse control method described above can be used substantially simultaneously with the completion of the container reverse process. Alternatively, the main crosshead retracting process can be completed before the container retracting process is completed, and the time required for the main crosshead retracting process can be further reduced. In addition, it is necessary to supply hydraulic oil from the main hydraulic oil supply source to the side cylinder for re-retraction operation to the reverse limit position of the main crosshead after the completion of the container reverse process. As a result, almost all of the hydraulic fluid from the main hydraulic fluid supply source can be supplied to the shear device (discard cutting device), and the time required for cutting the discard is shortened. Thus, not only the time required for the main crosshead retracting process can be shortened, but also the idle time itself can be shortened.

  Furthermore, since the container cylinder 128 of the extrusion press apparatus 200 of the second embodiment is disposed in the main cylinder housing 12 together with the side cylinder 26, the main crosshead retraction hydraulic circuit 284 is configured with a very short hydraulic pipe length. Therefore, it is possible to reduce the number of assembly steps such as the hydraulic piping of the extrusion press apparatus and the amount of hydraulic oil staying in the hydraulic piping. FIG. 7 is a schematic hydraulic circuit diagram for performing the main crosshead retraction control method by the extrusion press apparatus according to the second embodiment, so that only the main valves that are considered necessary for explanation are given reference numerals. did. Accordingly, all hydraulic equipment necessary for the actual hydraulic circuit is not described, and for the valves that are not provided with reference numerals, “open” and “closed” are illustrated in FIG. I stopped it.

  As mentioned above, although 1st Embodiment and 2nd Embodiment were described about the form for inventing, this invention is not limited to said embodiment, The content described in the claim Needless to say, the present invention can be implemented in various forms without departing from the above.

  For example, in the first embodiment, the container cylinder 128 has been described as having two oil chambers (the oil chamber 51 and the oil chamber 61) in the longitudinal direction of the cylinder rod 128A. A configuration including three or more oil chambers may be used as long as the arrangement restriction can be cleared.

  In the first embodiment, the hydraulic circuit 84 for controlling isobaric extrusion has been described on the assumption that the isobaric extrusion control method is performed. However, the hydraulic oil supplied to the container cylinder 128 from the hydraulic oil supply source 82 for isobaric extrusion control is not shown in FIG. 6A, but the container cylinder is moved forward by a direction switching valve or the like. The configuration may be such that the 128 divided oil chambers 56B and the divided oil chambers 66B and the divided oil chambers 56A and the divided oil chambers 66A to be retracted are selectively supplied. In this case, as in the case where the retreat speed of the container 18 is increased, either one of the divided oil chambers 56B (oil chamber 51) and divided oil chamber 66B (oil chamber 61) of the container cylinder 28 from the main pump 282 is divided. Alternatively, the hydraulic oil may be supplied only to the other divided oil chamber, and a tank line (not shown) may be opened to suck the hydraulic oil from the hydraulic oil tank. In the first embodiment, the isobaric extrusion control hydraulic oil supply source 82 is not used only in the isobaric extrusion control method during the extrusion process, and together with the main hydraulic oil supply source other than the extrusion process. Although it has been described that it is driven, it may be driven together with the main hydraulic oil supply source not only when the container 18 is moved forward but also when the container 18 is moved backward, other than the isobaric extrusion control method.

  For example, when the discard at the time of completion of the extrusion process is long, or when the extrusion material length L of the extrusion material 20 in the container 18 is long, or a high strength material is used in the middle of the extrusion process for the production of a very small number of lots. The force (container strip force) required for retracting the container 18 becomes larger than usual. In such a case or other cases where a large container strip force is required, the pressure control means 83 for controlling the isobaric extrusion is used to supply hydraulic oil having a pressure higher than normal to the container cylinder 128 so that the container 18 is You may retreat. If it is the structure of the container cylinder 128 demonstrated in 1st Embodiment, even if it is the same supply hydraulic oil pressure as the past, a container strip force higher than the past can be generated.

  Further, the isobaric extrusion control method is described in the first embodiment, and the main crosshead retraction control method is described in the second embodiment. However, in order to perform these control methods, all the configurations described in each embodiment may be included. There is no problem in performing each control method. For example, in the main crosshead retraction control method described in the second embodiment, if the valve 201B of the main crosshead retraction circuit 284 is closed and the main crosshead retraction hydraulic circuit 284 is closed, isobaric extrusion There is no problem in performing the isobaric extrusion control method described in the first embodiment by the control hydraulic circuit 84.

10 End platen, 10A Extrusion opening, 12 Main cylinder housing, 12A Main cylinder, 12B Main ram, 14 Tie rod, 16 Dies, 18 Container, 19 Container holder, 20 Extruded material (billet), 22 Main crosshead, 24 Extrusion Stem, 26 side cylinder, 26A cylinder rod, 28 container cylinder,
51 oil chamber, 52 rod portion, 53 cylinder body, 54 piston portion, 55 seal fixing member, 56A divided oil chamber, 56B divided oil chamber,
61 oil chamber, 62 rod portion, 63 cylinder body, 64 piston portion, 65 closing member, 66A divided oil chamber, 66B divided oil chamber,
71 connecting part,
81 Pressure detecting means, 82 Hydraulic oil supply source for isobaric extrusion control, 83 Pressure controlling means for isobaric extrusion control, 84 Hydraulic circuit for isobaric extrusion control, 85 controller,
100 extrusion press, 128 container cylinder, 128A cylinder rod,
200 Extrusion Press, 201A Valve, 201B Valve, 201C Valve, 282 Main Pump, 284 Main Crosshead Retraction Hydraulic Circuit,
B region, C region, D region,
F pushing force, Fa required pushing force, Fb friction force, Fbmax maximum friction force, Fbmin minimum friction force, Fb 'reaction force, Fb'max maximum reaction force, Fb'min minimum reaction force,
f container sealing force, fc required container sealing force, fd reduced container sealing force, fex container sealing force during extrusion, fmax maximum container sealing force, fmin minimum container sealing force, fs1 reference container sealing force 1, fs2 reference container sealing force 2,
L extrusion material length, Lmax maximum extrusion material length, Lmin minimum extrusion material length,
Pa Container seal force complementary pressure

Claims (3)

End platen,
A main cylinder housing that is arranged to face the end platen and is connected to the end platen by a plurality of tie rods;
A main cylinder disposed substantially in the center of the main cylinder housing;
A main cross head disposed between the end platen and the main cylinder housing and having an extrusion stem disposed so as to protrude from a front end surface;
A main ram that has one end fixed to the rear end surface of the main cross head, the other end is housed in the main cylinder, and advances the main cross head to approach the end platen;
A plurality of side cylinders disposed around the main cylinder of the main cylinder housing, wherein the main crosshead is moved forward to approach the end platen or moved backward from the end platen;
A container that is disposed between the end platen and the main crosshead, and stores the extruded material;
A plurality of container cylinders for advancing the container toward the end platen or retracting the container away from the end platen;
An extrusion press apparatus comprising:
The container cylinder is disposed around the main cylinder of the main cylinder housing;
The cylinder body of the container cylinder includes a plurality of oil chambers in the longitudinal direction of the cylinder rod of the container cylinder, and the cylinder rod communicating with the oil chamber is slid in the longitudinal direction in the oil chamber for each oil chamber. A movable piston part is formed,
In the oil chamber, a divided oil chamber that is divided into two in the longitudinal direction by the piston portion is formed,
When the container is retracted by the container cylinder, discharged hydraulic oil is discharged from each oil chamber of the container cylinder.
A main crosshead retraction hydraulic circuit capable of arbitrarily selecting a communication state to be supplied to the side cylinder and a closed state not to be supplied to the side cylinder for the retraction of the main crosshead by the side cylinder; Extrusion press device characterized by. While the container is retracted from the forward limit position to the backward limit position of the container by the container cylinder, the total volume of discharged hydraulic oil discharged from each oil chamber of the container cylinder is:
Approximately the same as the volume of the supply hydraulic oil necessary to move the extrusion stem and the main cross head at the push forward limit position to the reverse limit position of the main cross head by the side cylinder, or the supply hydraulic oil The extrusion press apparatus according to claim 1, wherein the container cylinder is configured to be larger than the volume of the extrusion cylinder. A main crosshead retraction control method for an extrusion press apparatus according to claim 1 or 2,
A container reverse preparation step of closing a hydraulic circuit for supplying hydraulic oil from a hydraulic oil supply source to the side cylinder after completion of the extrusion step, and bringing the closed state of the main crosshead reverse hydraulic circuit into a communicating state;
After the container retreat preparation step, supply a working oil from the working oil supply source to the container cylinder to retreat the container to a retreat limit position;
A main crosshead that retracts the main crosshead to a retreat limit position by supplying hydraulic oil discharged from the container cylinder in the container retraction process to the side cylinder via the main crosshead retraction hydraulic circuit. Retreating process,
Including
The main crosshead retraction control method for an extrusion press apparatus, characterized in that the main crosshead retraction step is completed substantially simultaneously with completion of the container retraction step or before completion of the container retraction step.

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