JP5928147B2 - Extrusion press - Google Patents

Description

  The present invention relates to an extrusion press that obtains a product of a predetermined shape by extruding a billet held by a container from a hole of a die by pushing it with an extrusion stem.

  Among these types of extrusion presses, a direct extrusion press that performs billet supply and extrusion while a container is fixed is conventionally configured as follows. That is, this extrusion press is provided with an extrusion stem that is driven by a main ram and advances and retracts in the axial direction, and a cylindrical container having an inner hole for fitting the extrusion stem so as to freely advance and retract. As shown in FIG. 3, a die stack 20 including a die 24 and bolsters 22 and 23 is provided in the die block 19 on the side opposite to the extruding stem. Further, above the contact portion between the container 11 and the die 24, a shear 28 that is driven by a driving device and advances and retreats in a direction orthogonal to the extrusion direction is provided.

  The die 24 is held by the die stack 20 and is supported so as to be able to advance and retreat in the extrusion direction of the billet 14, and is supported so as to be capable of advancing and retreating to the end platen 4 so as to surround the hole of the die 24. A driving device 29 that presses to a predetermined position and a regulating member that regulates the movement of the die 24 toward the container 11 are provided.

With this configuration, for example, when a cylindrical billet 14 is supplied to the inner hole of the container 11 and the extrusion stem is advanced by the main ram, the billet 14 pushed by the extrusion stem is moved into the die stack 20. The product 25 is extruded from the hole of the die 24. Therefore, when the container 11 is moved backward in the direction away from the die 24, the discard 26 as the extrusion rod protrudes from the hole of the die 24 toward the container 11, so when the shear 28 is lowered, the discard 26 is It is cut and collected with a shear blade, and the product 25 is taken out in the extrusion direction.
In this configuration, when the discard 26 is cut, the die stack 20 is pressed by the driving device 29 in the direction of the container 11, so that the cutting location of the discard 26 by the shear 28 is constant regardless of the temperature condition of the die 24. In addition, the inclination of the die 24 is eliminated to improve the shearing degree of the shear blade. (See Patent Document 1)

  By the way, the conventional extrusion press has a configuration in which a plurality of drive devices for pressing the die stack toward the container side are provided so as to surround the extrusion hole in the recess provided at the position corresponding to the extrusion core of the end platen. . In this configuration, the recessed portion provided in the end platen requires a large number of space gaps in the drive device and piping and wiring therefor, and the opening area is set large, so that the thickness of the end platen increases and the extrusion press becomes large. The production cost was high. In addition, since the drive device requires many space gaps in the peripheral portion, it is difficult to employ this configuration with a pressing press having a small extrusion capability.

JP-A-4-367315

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an extrusion press that is miniaturized while improving the degree of shearing according to the exact end face position of the shearing blade.

In order to achieve the above-mentioned invention, the present invention comprises a die held by a holding portion of a die and a concentric container that can be brought into and out of contact with the die, and a billet supplied to the inner hole of the container is inserted into the extrusion stem. It is configured to extrude from the hole of the die by advancement and cut the waste left in the container after extrusion with a shearing device that advances and retreats following the container side end surface of the die after the retreat of the container, and holds the die Is supported by the end platen so as to be able to advance and retract in the direction of billet extrusion at the part, and is placed on the upper and lower sides so as to surround the hole of the die, and presses the die to a predetermined position on the container side at the tip In the extrusion press provided with a plurality of pressing members that are driven forward and backward by the driving device and a regulating member that regulates the movement of the die toward the container, Member, rod characterized by pressing in the drive unit via a linked lever mechanism freely swing.

Since the pressing member that presses the die stack in the container direction is driven through the lever mechanism, the opening area of the recess of the end platen can be reduced. For this reason, the thickness of an end platen can be made small and an extrusion press can be reduced in size.
Since the die stack is pressed toward the container when cutting the discard, the cutting position of the discard can be made constant, the inclination of the die can be eliminated, and the cutting condition of the shear blade can be improved.

It is sectional drawing of the principal part explaining embodiment of this invention. It is a whole figure explaining the outline | summary of an extrusion press. It is sectional drawing explaining the structure of the conventional extrusion press.

  1 and 2 are a sectional view and an overall view showing an embodiment of the present invention. As shown in the figure, the extrusion press 1 is provided with a main cylinder platen 3 and an end platen 4 which are erected on the machine base 2 so that both platens 3 and 4 are tie rods at four corners. 5 are connected. A main cylinder 8 supported by a support base 6 and having a rear end connected to a tank 7a by a prefill valve 7 or piping is fixed to the cylinder platen 3, and is provided in the main cylinder 8 so as to be able to advance and retreat. The main ram 8 a is connected to a pusher stem 9 that moves forward and backward in the axial direction by a hydraulic pressure supplied to the main cylinder 8 via a crosshead 10.

  What is indicated by reference numeral 11 is a container disposed near the end platen 4 between the platens 3 and 4, and is composed of a cylindrical container liner, a container tire, and a container holder. The base 2 is moved back and forth in the axial direction. A heater is attached to the container tire. Near the container 11 side between the container 11 and the cylinder platen 3, a billet loader 13 is provided so as to be movable between the paper rear side and the front side in the figure, and is held by the billet loader 13 at a position outside the machine. The billet 14 is configured to be supplied to the inner hole 11 a of the container 11 by the movement of the billet loader 13 to the illustrated position and the advancement of the extrusion stem 9.

  An upper guide 15 and a lower guide 16 are attached to the end surface of the end platen 4 at positions adjacent to the container side of the end platen 4, and a die block 19 as a die holding member is attached to the upper and lower guides 15, 16. The protrusion 15a and the groove 19a, and the protrusion 16a and the groove 16b are engaged with each other so as to be able to advance and retract in the horizontal direction. The die block 19 is driven by a driving device (not shown) so as to advance and retract horizontally in a direction perpendicular to the axial direction. The inner hole 19a of the die block 19 is entirely designated by reference numeral 20. The die stack shown by is formed and fitted so as to be able to advance and retract in the extrusion direction of the billet 14. Further, a hose shoe 21 as a restricting member for restricting the movement end of the die stack 20 toward the container 11 is formed in a U-shape in front view on the end surface of the die block 19 on the container 11 side. The die stack 20 is fixed to be formed in an L shape, and the end of movement of the die stack 20 toward the container 11 is regulated by the hose shoe 21.

The die stack 20 is formed of cylindrical bolsters 22 and 23 that are divided into two in the axial direction, and a cylindrical die 24 that can be attached to and detached from the bolster 23. As described above, the die stack 19 is configured to move horizontally between the axial position of the container 11 and the position outside the machine, as described above. By forming the total length up to the stepped portion up to the hose shoe 21 slightly smaller than the distance between the end surface of the end platen 4 and the stepped portion of the hose shoe 21, it can be slightly advanced and retracted in the direction of pushing the billet 14 as described above. It is configured as follows.

  The detachable die 24 is provided with an extrusion hole 24a concentric with the inner hole 11a of the container 11 and a large-diameter hole 24b thereby being driven by the main ram 8 to advance the extrusion stem 9. The billet 14 is pressed by the extrusion stem 8 and is extruded as a product 25 from the extrusion hole 24a of the die 24 into the large-diameter hole 24b. Reference numeral 26 denotes a discard as an extrusion rod left as a result of extruding the billet 14. When the extrusion is completed, the end of the inner hole 11 a of the container 11, or the inside of the gap between the retracted container 11 or extrusion stem 9 and the die 24 Protruding.

  Further, above the front end surface of the container 11 at the forward position shown in the figure, a shear elevating cylinder 27 is supported by the end platen 4, and the lower end portion of the piston rod that moves up and down by its hydraulic pressure is lowered by lowering. A shear 28 that shears the boundary between the discard 26 and the product 25 is fixed. Then, when the specification of the product 25 is changed and the die 24 is replaced, the die block 19 holding the die stack 20 is moved in a direction orthogonal to the extrusion direction, and is replaced by a die changer (not shown) at the outside position. The hose shoe 21 is opened upward for the replacement, and the die block 19 is provided with a space portion 19c for the opening.

  At the position corresponding to the extrusion core of the end platen 4, the rod hole of the end platen 4 and the rod hole of the pressure rings 31 and 32 provided by being fitted to the concave hole 4c of the end platen 4 via the bush 4d are slidable. A plurality of push rods 33 as pressing members to be fitted are disposed so as to surround the push hole 24a. A driving device 29 as a pressing unit for the push rod 33 is provided on the outer peripheral surface (the upper surface and the lower surface in FIG. 1) of the end platen 4. The distal end portion of the drive device 29 is pivotally supported via a bracket 30 provided on the end surface opposite to the die of the end platen 4 and one end of the lever mechanism 34, and the other end portion of the lever mechanism 34. Is pivotably connected to each push rod 33. The drive device 29 is preferably provided on the upper and lower surfaces or both side surfaces of the end platen. As the drive device 29, a fluid pressure cylinder such as a hydraulic cylinder or a pneumatic cylinder, or a mechanism for converting rotational motion into linear motion by electric drive is suitably used. FIG. 1 shows a configuration using a fluid pressure cylinder. .

  When the drive device 29 is operated and the push rod 33 is advanced to the die stack side, the die stack 20 is moved in the die block 19 until the movement limit is restricted by the step portion of the hose shoe 21. ing. In other words, even if a difference due to a difference in thermal expansion occurs in the thickness of the die stack 20, the forward limit of the die stack 20 is constant, and the end surface thereof coincides with the shear surface of the shear 28. When the die stack 20 is pressed against the hose shoe 19, for example, the pressing force of the lower two pressing rods 33 is set to be larger than the pressing force of the upper two pressing rods 33, so that the space 19 c is formed in the die block 19. Even if there is, it is possible to prevent the die 24 pushed by the push rod 33 from tilting.

  The operation of the extrusion press configured as described above will be described. When the billet 14 is transported by the rotation of the arm of the billet loader 13 while the container 11 is moving forward to a position where it abuts against the die 24, the extrusion stem 9 is moved forward by the operation of the main ram 8a. Since 14 is pushed, the billet 14 is inserted into the inner hole 11 a of the container 11. When the extrusion stem 9 is further advanced, the billet 14 is pressed and extruded as a product 25 from the extrusion hole 24a of the die 24 through the holes of the bolsters 22 and 23 into the holes of the end platen 4.

When the extrusion is finished, the container 11 is retracted, and the discard 26 as an extrusion basket projects from the rear end surface of the container 11. Therefore, when the hydraulic cylinder 29 is operated simultaneously and the push rod 33 is advanced toward the container 11 side, the tip of the push rod 33 abuts against the end face of the die stack 20 to push the die stack 20, and as shown in FIG. The die stack 20 moves and stops until the portion abuts against the stepped portion of the hose shoe 21 and the movement limit is restricted. At this time, the end surface of the die stack 20 on the container 11 side and the shear surface of the shear 28 are Match.
That is, even if the die stack 20 is thermally expanded, since the die stack 20 is restricted from moving to the container 11, the die stack 20 is expanded only in the direction in which the push rod 33 is retracted. Even if there is a difference, the forward limit of the die stack 20 becomes constant, and the end surface thereof coincides with the shear surface of the shear 28.

  In the present apparatus, for example, by setting the pressing force of the lower two push rods 33 to be larger than the pressing force of the upper two push rods 33, the space 19c is formed in the die block 19. Even if the die 24 is restricted by the hose shoe 21 only on the lower side, the die 24 does not tilt.

  In this state, the piston rod of the shear lowering cylinder 27 is lowered, the shear 28 integrated therewith is lowered along the end face of the die stack 20, and the discard 26 is reliably sheared from the boundary with the product 25. The sheared discard 26 is recovered by sliding on the chute. When the shear 28 is lowered and the discard 26 is cut from the product 25, the discard 26 is taken out and the product 25 is pulled out in the extrusion direction and taken out. By doing so, the rear end portion of the product 25 comes out of the extrusion hole 24a of the die 24 and is conveyed by a puller (not shown). Thereafter, the shear 28 is raised and the push rod 33 is retracted.

  In this embodiment, when the push rod 33 abuts against and pushes the end face of the die stack 20, that is, when the discard 26 is sheared by the shear 28, the end face on the product 25 side of the discard 26 is the die 24. Although an example in which the end face is in close contact with the end face is shown, the product 25 may be slightly retracted and sheared in a state where a gap is provided between the end face of the discard 26 and the end face of the die 24. good.

  As is apparent from the above description, according to the present invention, the drive of the pressing rod that presses the die stack toward the container is provided on the upper and lower surfaces that are the outer peripheral portion of the end platen or the side surface orthogonal to the extrusion direction, and the lever mechanism is interposed. Thus, since the push rod of the die stack provided in the recess at the position corresponding to the extrusion core is operated, the thickness of the end platen can be reduced and the extrusion press can be downsized. Further, since the drive device for driving the push rod is provided on the outer peripheral surface of the end platen, the maintainability of the drive device can be improved.

  A die held by a holding part of the die and a concentric container that is detachable from and connected to the die, and a billet supplied to the inner hole of the container is extruded from the hole of the die by the advancement of the extrusion stem. As a result, the extrusion trough left on the container side is configured to be sheared by a shear that advances and retracts in a direction orthogonal to the extrusion direction after the container is retracted, and the die can be moved forward and backward in the billet extrusion direction at the die holding part. It is supported and movably supported on the machine base side so as to surround the hole of the die, and is arranged on the upper side and the lower side, and is driven forward and backward by the driving device so as to press the die to a predetermined position on the container side at the tip. By providing a plurality of pressing members and a regulating member that regulates the movement limit of the die to the container side, even when the die stack and the die are thermally expanded, Even if the pressing member pushes the die stack toward the container side and stops it at a predetermined position, and the thermal expansion difference can be made depending on the material or the like, the end surface on the container side of the die stack becomes a fixed position and the end surface coincides with the shear surface of the shear Since the extrusion press having the configuration is used, the extrusion wrinkle is surely sheared from the boundary with the product, and a good cutting condition of the shear can be maintained.

DESCRIPTION OF SYMBOLS 1 Extrusion press 4 End platen 9 Extrusion stem 11 Container 11a Inner hole 14 Billet 15 Upper guide 15a Protrusion 16 Lower guide 16a Protrusion 19 Die block 19a Groove 19b Groove 20 Die stack 21 Hose shoe 24 Die 24a Extrusion hole 26 Discard 28 Shear 29 Drive unit 30 Bracket 33 Push rod 34 Lever mechanism

Claims (1)

A die held by the holding part of the die, and a concentric container that can be contacted and separated from the die,
The billet supplied to the inner hole of the container is extruded from the hole of the die by the advancement of the extrusion stem,
Discard left in the container after extrusion is configured to be cut by a shearing device that advances and retreats along the container side end surface of the die after the container is retracted, and the die is advanced and retracted in the billet extrusion direction by the die holding part. It is supported by the end platen so that it can freely support and surround the die hole, and it is arranged on the upper and lower sides so that the die is pushed to the predetermined position on the container side by the drive device. In an extrusion press provided with a plurality of pressing members and a regulating member that regulates movement of the die to the container side,
An extrusion press, wherein the pressing member is pressed by the driving device via a lever mechanism in which a rod is slidably connected .

Images