JPH04367315A - Extrusion press - Google Patents

Abstract

PURPOSE:To offer the device which can correctly set a shearing position of a discard by a shear irrespective of a temperature condition, etc., and also, can eliminate an inclination of a die at the time of shearing. CONSTITUTION:A die stack 20 consisting of a die 24 and bolsters 22 23 is supported by a die block 19 so that it can advance and retreat to and from the extruding direction of a billet 14. A hose shoe 21 for controlling a moving end limit to a container 11 side of the die stack 20 is fixed and provided in the die block 19. Plural pieces of push rods 33 for advancing and retreating by driving of a hydraulic jack 29 and pushing the die stack 20 is supported by a machine body side so as to surround an extrusion hole 24a of the die 24. In these push rods 33, pressing force of the push rod 55 of the lower side is larger than pressing force of the push rod of the upper side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion press that obtains a product by extruding a billet held in a container through a hole in a die by pushing it with an extrusion stem.

0002

2. Description of the Related Art Among these types of extrusion presses, a direct extrusion press that feeds and extrudes billets with a fixed container has conventionally been constructed as follows. That is,
This extrusion press is equipped with an extrusion stem that is driven by a main ram and moves forward and backward in the axial direction, and a cylindrical container that has an inner hole into which this extrusion stem is fitted so that it can move forward and backward. On the extrusion stem side, a die stack consisting of a die and a bolster is installed in a die block. Further, above the contact portion between the container and the die, a shear is provided which is driven by a drive device and moves back and forth in a direction perpendicular to the extrusion direction.

With this structure, when a cylindrical billet, for example, is supplied to the inner hole of the container and the extrusion stem is advanced by the main ram, the billet pushed by the extrusion stem is placed inside the die stack. The product is extruded through the holes of the die. Therefore, when the container is moved back in the direction away from the die, the discards as extruded lees left as a result of extrusion protrude from the holes of the die toward the container, so when the shear is lowered, the discards are The product is sheared and accumulated in the extrusion direction.

0004

[Problems to be Solved by the Invention] However, in such conventional extrusion presses, when the shear is shearing the discard, the shear is always fixed at a fixed position in the extrusion direction, whereas the die stack is The thickness is
This varies according to the differential thermal expansion due to changes in the extrusion material, and the shear does not necessarily always descend in contact with the rear surface of the die to cut between the discard and the rear end of the product part. When the shear is located away from the rear surface of the die, the shearing position is not good, so there is a problem that the shearing performance is poor. This is because as the extrusion press becomes larger, the thickness change of the die stack due to the difference in thermal expansion becomes larger, and the difference becomes, for example, 4 mm, which causes the problem that the discard remains on the die side without being cut.

[0005]Also, a die stack consisting of a die and a bolster is incorporated into the central shaft of the die block, but
An upper space is provided above the die block for convenience when replacing the die stack by installing or removing it from the die block outside the machine. It is held in place by a horseshoe attached to a block. With this type of structure, the die is pushed from the opposite side of the container with a push rod to press the shoulder of the die against the inner wall of the horseshoe to accurately position the end face of the die during shearing. In this case, the part that supports the shoulder of the die is only the lower half of the horseshoe, and the upper half is a space, so the die tilts toward the container side, the end face position is not accurate, and the shear There is a problem that the cutting condition deteriorates.

The present invention has been made in view of the above points, and an object of the present invention is to make the shearing point of the discard by the shear constant regardless of temperature conditions, and to eliminate the inclination of the die to improve the cutting quality of the shear. The purpose is to provide an extrusion press that makes it possible to

[0007]

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a die held in a die holder, and a concentric container that can be adjacent to 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, and the extruded residue left on the container side of the die as a result of this extrusion is moved back and forth in a direction perpendicular to the extrusion direction after the container retreats. In an extrusion press configured to perform shearing with a shear that A plurality of pressing members arranged on the upper side and the lower side and driven forward and backward by a drive device so that their tips press the dice to a predetermined position on the container side, and a regulating member that restricts the limit of movement of the dice toward the container side. and the pressing force of the lower pressing member was made larger than the pressing force of the upper pressing member.

[0008]

[Operation] A product is obtained by extruding the billet supplied into the inner hole of the container through the extrusion hole of the die by advancing the extrusion stem. After extrusion, the container is moved backward to separate it from the die stack, and then the pressing member whose tip is in contact with the end face of the die stack is advanced toward the container until the die contacts the regulating member, and the end face of the die is at a predetermined position. When the shear is lowered after this point, the shear is lowered in contact with the end face of the die, and the discard protruding from the die is sheared. During this shearing, the advancing limit of the thermally expanding die stack towards the container side is regulated by the regulating member, so that the position of the end face of the die on the container side and the shear remains constant regardless of the magnitude of thermal expansion. In addition, even if there is a space above the die in the advancing direction that is pressed by the pressing member, the die does not tilt toward the container because the pressing force on the upper side is small, which reduces the degree of cutting of the shear. Never.

[0009]

[Embodiment] Figures 1 to 4 show an example of an extrusion press according to the present invention, in which Figure 1 is a longitudinal cross-sectional view of the vicinity of the die block, Figure 2 is a front view taken from II in Figure 1, and Figure 3 is a front view of Figure 1. III. Front view, FIG. 4 is a schematic side view of the entire extrusion press. As shown in FIG. 4, the extrusion press 1 includes a cylinder platen 3 and an end platen 4, which are opposed to each other on a bed 2. are connected. A main cylinder 8 is fixed to the cylinder platen 3 and is supported by a support stand 6 and whose rear end is connected to a tank 7a through piping 7 and a valve. A push-out stem 9 that moves back and forth in the axial direction by hydraulic pressure supplied to the main cylinder 8 is attached to the main ram 8a, which is connected to the crosshead 1.
Connected via 0.

[0010] What is indicated by reference numeral 11 in the figure is both platens 3.
, 4, the container is located near the end platen 4, and is formed by a cylindrical container liner, a container tire, and a container holder fitted in order from the inside, and is connected by a hydraulic cylinder (not shown). It is configured to move forward and backward along the rail 12 in the axial direction. Note that a heater is embedded in the container tire. A billet loader 13 is provided near the container 11 between the container 11 and the cylinder platen 3 so as to be movable between the back side and the front side of the paper in the figure.
The billet 14 gripped at the outside position is supplied to the inner hole 11a of the container 11 by moving the billet loader 13 to the illustrated position and advancing the extrusion stem 9.

An upper guide 15 and a lower guide 16 are fixed to the end surface of the end platen 4 with bolts 17 and 18 at positions adjacent to the inner side of the end platen 4. The die block 19 as a member includes the protrusion 15a, the groove 19a, and the protrusion 1.
6a and the groove 19b are fitted so that they can move forward and backward in the horizontal direction. The die block 19 is driven by a drive device (not shown) and is configured to advance and retreat horizontally in a direction perpendicular to the axial direction. A die stack shown by is formed and fitted so as to be movable forward and backward in the extrusion direction of the billet 14. Further, on the end face of the die block 19 on the container 11 side, a horseshoe 21 serving as a regulating member for regulating the limit of movement of the die stack 20 toward the container 11 side is formed in a U-shape when viewed from the front and has a cross-sectional shape. L
The die stack 20 is fixed in the shape of a letter, and the end of movement of the die stack 20 toward the container 11 is restricted by the horseshoe 21 . And this die stack 2
0 is a cylindrical bolster 22 divided into two in the axial direction,
23 and a cylindrical die 24 that is detachable from the bolster 23. This die stack 20 is formed of a die block 1 as described above in order to replace the die 24.
9, the die stack 20 is configured to move horizontally between the axial center position of the container 11 and the outside position of the container 11. End surface of end platen 4 and horseshoe 2
By forming the gap to be slightly smaller than the distance to the step part 1, the billet 14 is configured to be able to move forward and backward slightly in the extrusion direction as described above.

[0012] The container 11 is attached to the removable die 24.
An extrusion hole 24a coaxial with the inner hole 11a and a hole 24b with a larger diameter are bored, and when the extrusion stem 9 moves forward driven by the main ram 8, the billet 14 is pressed by the extrusion stem 9. The product 25 is extruded from the extrusion hole 24a of the die 24 into the large-diameter hole 24b. 26 is a discard as an extrusion residue left after extruding the billet 14, and when extrusion is completed,
It protrudes into the end of the inner hole 11a of the container 11 or into the space between the retracted container 11 or the extrusion stem 9 and the die 24.

Furthermore, a shear lifting cylinder 27 is supported by the end platen 4 and is provided above the front end surface of the container 11 in the forward position shown in the figure, and the lower end of the piston rod that moves up and down with the hydraulic pressure is , shear 2 that shears the boundary between the discard 26 and the product 25 by descending.
8 is fixed. When the specifications of the product 26 change and the die 24 is replaced, the die block 19 holding the die stack 20 is moved in a direction perpendicular to the extrusion direction and replaced using a die changer (not shown) at a position outside the machine. For this exchange, the horseshoe 21 is opened upward, and the die block 1 is
9 is provided with a space 19c corresponding to this opening.

On the other hand, in the concave hole 4b provided in the position corresponding to the extrusion core of the end platen 4, there are a plurality of hydraulic drive devices, four in this embodiment, arranged so as to surround the extrusion hole 16a. A jack 29 is supported via a bracket 30 close to the bottom of the recessed hole 4b, and a piston rod of each of these hydraulic jacks 29 has a rod hole in the end platen 4, and a bushing in the recessed hole 4c of the end platen 4. Pressure rings 31 and 32 fitted through 4d
A push rod 33 is connected as a push member that slidably fits into the rod hole. Each push rod 33 is provided so that its tip can come into contact with the end surface of the die stack 20, and when the hydraulic jack 29 is operated to advance the push rod 33 toward the die stack 20, the horseshoe 21 The die stack 20 is configured to move within the die block 19 until the limit of movement is restricted by the stepped portion. That is, even if there is a difference in the thickness of the die stack 20 due to the difference in thermal expansion, the forward limit of the die stack 20 is constant and the end face thereof is configured to coincide with the shearing surface of the shear 28. In this device, the pushing force of the two lower push rods 33 is equal to the pushing force of the two upper push rods 33.
3, and even if there is a space 19c in the die block 19, the push rod 3
The die 24 that is pressed in step 3 is configured so as not to tilt. 29a is a limit switch that detects whether the push rod 33 is reliably retracted.

The operation of the extrusion press constructed as above will be explained. When the billet 14 is conveyed by the rotation of the arm of the billet loader 13 while the container 11 is moving forward to the position shown in FIG. 4, the extrusion stem 9 is moved forward by the operation of the main ram 8a. Billet 1
4, the billet 14 is inserted into the inner hole 11 of the container 11.
inserted into a. When the extrusion stem 9 is further advanced, the billet 14 is pressed and the extrusion hole 24a of the die 24 is pressed.
From there, the product is extruded 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 moved backward, so that the discard 26 as the extruded dregs protrudes from the rear end surface of the container 11. Therefore, when the four hydraulic jacks 29 are actuated simultaneously to move the push rod 33 forward toward the container 11, its tip comes into contact with the end surface of the die stack 20 and pushes the die stack 20, causing the die 24 to move forward as shown in the figure. The die stack 20 moves and stops until the stepped portion of the horseshoe 21 comes into contact with the stepped portion of the horseshoe 21 to restrict the movement limit, and at this time, the end surface of the die stack 20 on the container 11 side and the sheared surface of the shear 28 matches. In other words, even if the die stack 20 thermally expands, the movement of the die stack 20 toward the container 11 is restricted, so the die stack 20 expands only in the direction of retracting the push rod 33. Die stack 2 even if there is an expansion difference
The forward limit of 0 is constant and its end surface coincides with the shearing surface of the shear 28. Furthermore, in this device, the pressing force of the two lower push rods 33 is set to be greater than the pressing force of the two upper push rods 33, so that a space 19c is formed in the die block 19. Therefore, even if only the lower side of the die 24 is restricted by the horseshoe 21, the die 24 will not tilt.

In this state, the piston rod of the shear lifting cylinder 27 is lowered, and the shear 28 integrated therewith is lowered along the end face of the die stack 20, so that the discard 26 is reliably sheared from the boundary with the product 25. . The sheared discard 26 slides on the chute and is collected. After the shear 28 descends and cuts the discard 26 from the product 18, the discard 26 is taken out and the product 25 is pulled in the extrusion direction and taken out. By doing this,
The rear end of the product 25 comes out of the extrusion hole 24a of the die 24, and is conveyed by a puller (not shown). after this,
As the shear 28 rises, the push rod 33 retreats.

In this embodiment, when the push rod 28 is in contact with and pushing the end face of the die stack 20,
In other words, when the discard 26 is sheared by the shear 28, the end face of the discard 26 on the product 25 side is in close contact with the end face of the die 24. End face and die 2
Shearing may be performed with a gap provided between the end face of No. 4 and the end surface of No. 4.

[0019]

Effects of the Invention As is clear from the above description, the present invention includes a die held in a die holding portion and a container that is concentric with the die and can be adjacent to the die, and is supplied to the inner hole of the container. The extrusion stem advances to extrude the billet from the hole in the die, and after the container retreats, the extruded residue left on the container side of the die is sheared by a shear that moves back and forth in a direction perpendicular to the extrusion direction. In the extrusion press configured, the die is supported by a die holding portion so as to be movable forward and backward in the extrusion direction of the billet, and is also supported movably forward and backward by the machine base so as to surround the hole of the die, and is disposed on the upper and lower sides. By providing a plurality of pressing members that are driven forward and backward by a drive device so as to press the dice to a predetermined position on the container side with their tips, and a regulating member that restricts the limit of movement of the dice toward the container side, Even if the die stack and dies expand thermally, the pressing member pushes the die stack toward the container and stops it at a predetermined position during shearing by the shear, and even if there is a difference in thermal expansion due to materials etc.
Since the end surface of the die stack on the container side is in a fixed position and coincides with the shearing surface of the shear, the extruded lees is reliably sheared from the boundary with the product, and the good cutting condition of the shear can be maintained. . In addition, by making the pressing force of the lower pressing member larger than that of the upper pressing member, even if a space is provided at the top of the die block for die replacement, when pressing by the pressing member, The die does not tilt, and shearing by the shear is performed reliably.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the vicinity of a billet extrusion section.

FIG. 2 is a front view taken from II in FIG. 1;

FIG. 3 is a front view from III in FIG. 1;

FIG. 4 is a schematic side view of the entire extrusion press.

[Explanation of symbols]

1 Extrusion press 4 End platen 9 Extruded 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 24 Dice 24a Extrusion hole 25 Products 26 Discard 28 Shah 33 Push rod

Claims (1)

[Claims] Claim 1: A die held in a die holder, and a container that can be adjacent to and concentric with the die, the billet supplied to the inner hole of the container being extruded from the hole of the die by the advancement of an extrusion stem; In an extrusion press configured to shear the extruded residue left on the container side of the die as a result of this extrusion with a shear that moves back and forth in a direction perpendicular to the extrusion direction after the container retreats, the die is held in a die holding section. In addition to supporting the billet so that it can move forward and backward in the extrusion direction, it is supported so that it can move forward and backward in the machine side so as to surround the hole of the die, and is arranged on the upper and lower sides, and the tip presses the die to a predetermined position on the container side. A plurality of pressing members that are driven forward and backward by a drive device and a regulating member that restricts the limit of movement of the dice toward the container are provided, and the pressing force of the lower pressing member is equal to the pressing force of the upper pressing member. An extrusion press characterized by being larger than.