US3583197A

US3583197A - Extrusion press and counterplaten therefor

Info

Publication number: US3583197A
Application number: US789502A
Authority: US
Inventors: Helmut Robra
Original assignee: Schloemann AG
Current assignee: Schloemann AG
Priority date: 1968-01-10
Filing date: 1969-01-07
Publication date: 1971-06-08
Anticipated expiration: 1988-06-08
Also published as: GB1204452A; FR1597107A

Abstract

A counterplaten for a horizontal extrusion press with a tool slide sliding horizontally on the counterplaten in a horizontal guideway, the toolslide having an aperture for receiving the die (and normally a dieholder and a bolster) with at least part of the bottom of the aperture closed by a member which in the working position of the toolslide is held closed by the guideway but in the rest position of the toolslide can be opened to release the die.

Description

United States Patent [72] Inventor Helmut Robra [56] References Cited Muelhei' (Ruhrb Germany UNITED STATES PATENTS P 7891502 2,858,017 10/1958 Kent 72/255 [22] Med 3 116' 833 1/1964 v0 el 72/263 45 1 Patented June a, 1971 g [73] Assignee Schloemann Aktiengesellschaft FOREIGN PATENTS Dusseldorf, Germany 1,020,951 12/1957 Germany 72/263 [32] Priority Jan. 10, 1968 1,105,366 12/1965 Great Britain 72/255 [33] Germany Primary Examiner-Richard J. Herbst [3 n P 16 52 601's Assistant Examiner-A. L1 Havis Attorney-Holman & Stem ABSTRACT: A counterplaten for a horizontal extrusion press [54] EXTRUSION PRESS AND COUNTERPLATEN with a tool slide sliding horizontally on the counterplaten in a THEREFOR horizontal guideway, the toolslide having an aperture for 13 Claims 3 Draw'ng receiving the die (and normally a dieholder and a bolster) with [52] US. Cl 72/255, at least part of the bottom of the aperture closed by a member- 7 2/263 which in the working position of the toolslide is held closed by [51] Int. Cl B21c 23/00 the guideway but in the rest position of the toolslide can be [50] Field of Search 72/255, 263 opened to release the die.

PATENTEEJJUN Si n 3583.197

J INVENTOR.

HELMUT ROBRA QM? W EXTRUSEON PRESS AND COUNTERPLATEN THEREFOR The invention relates to a toolslide for a horizontal extrusion press used principally for the production of metal (particularly aluminum) tubes, the press having a horizontal guide located on the counterplaten transversely to the axis of the press and an aperture which is outwardly open and located on the longitudinal axis of the toolslide, for receiving the dieholder, die and bolster. The term counterplaten" is used generally herein to designate the part of the press which takes up the extrusion force applied to the die, the counterplaten normally taking up the extrusion force by way of various intermediate members such as the dieholder and bolster.

Conventional toolslides on horizontal tube extension presses have apertures or recesses which serve to receive the dieholder and bolster and which extend vertically or at an angle in an upward direction. Although this arrangement enables the shearing pressure produced when the extruded product is cut using a downwardly moving shear to be absorbed by the counterplaten through the toolslide and slideway, the dieholder can only be changed in an upward direction and usually only by using a jack or other ejection system.

lt also often occurs that because of the parts being smeared with flash during shearing, particularly in the case of aluminum alloys, friction between the shear blade and the front edge of the die causes the die to be drawn upwards as the shear blade is withdrawn. In order to avoid this, it is necessary to provide extra, releasable retaining clips on the apertures in the toolslide.

It is only possible to simplify the tool replacement system by allowing the tools to roll out in presses in which apertures are arranged so as to extend downwards at an angle in the toolslide, the slide being moved to one side out of the axis of the press and the tool clamps released. A new tool is inserted by means of a pusher ram in such presses with a downwardly inclined aperture from a slidable table. The advantage of rapid tool replacement is, however, offset by the disadvantage that the vertical downward shearing forces are not absorbed by the downwardly inclined tool aperture and are not transmitted through the slideway to the counterplaten.

According to a first aspect of the present invention, there is provided a horizontal extrusion press counterplaten having a horizontal guideway located thereon and extending transversely to the press axis,

a toolslide guided by the guideway and movable between a working position and a rest position,

the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die (and normally a dieholder for the die and a bolster behind the die), at least part of the bottom of the aperture being openable to allow the die to leave the aperture, and

a member having its top portion profiled to close the bottom of said aperture and retain the die in position (normally by retaining the dieholder in position), the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the member also being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position.

According to a second aspect of this invention, there is provided a horizontal extrusion press having a counterplaten according to the first aspect of the invention.

Using the invention, it is possible to replace the die (normally with the dieholder and bolster) quickly and easily without the need for a jack or other ejection system to eject the die, dieholder and bolster, in that the die, dieholder and bolster can leave the aperture in a direction having at least a downwards component of movement.

As the retaining member is held closed by the guideway when the tool slide is in the working position, both an upward and a downward shearing force can be absorbed by the guideway, as well as shearing forces at other angles.

The retaining member is preferably pivoted to the toolslide, and preferably again the retaining member and the toolslide act like a pair oftongs to retain the die in position.

In order to enable the retaining member to be pivoted downwards when the toolslide is in the rest position whilst employing a simple pivoting movement, the pivot axis of the retaining member may be at or beyond the end of the guideway when the toolslide is in its rest position.

Preferably, the bottom of the retaining member is in alignment with the bottom of the toolslide; this enables the retaining member to slide along the same guide surfaces in the guideway as the toolslide.

A pivoted table may be provided for engaging the retaining member when the toolslide is in its rest position and for controlling the movement of the retaining member; the pivoted table is preferably arranged such that its pivot axis is at the rest end of the guideway. Power means such as a hydraulic piston and cylinder arrangement articulated to the pivoted table, may be provided for moving the pivoted table to move the retaining member into its closed position. In this manner, the retaining member can abut the pivoted table when the toolslide is in the rest position, and the retaining member can be lowered to such an extent that the downwardly inclined opening which is now formed leading out of the aperture releases the die (and dieholder and bolster if present) which is able to roll on to a, say, conventional die replacement table, the die replacement table preferably having an angle of inclination the same as that of the downwardly inclined retaining member.

If, as would be normal, the aperture in the toolslide is arranged to receive a die and a bolster, two retaining members may be provided, one for the bolster and one for the die, and likewise two pivoted tables may be provided, one for each retaining member. In this manner, for example, when the toolslide is moved sideways out of its working position, the bolster may be held in position by holding the respective retaining member closed whilst the die (normally with the dieholder), which has to be replaced much more often, can be allowed to roll out of the toolslide aperture by opening the respective retaining member, enabling a new die (and dieholder) to be inserted into the aperture using a die exchange system. The die or dieholder may be secured in the aperture by means ofa securing pin, and the respective retaining plate can be closed and the toolslide again moved into the working position, thus completing the replacement of the die.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing, in which FIG. 1 is a view of a slide which is able to slide transversely to the axis of a horizontal extension press on a slideway, the die being secured in a working position;

HO. 2 is a section along the line ll-ll in P10. 1; and

FlG. 3 is a view of the toolslide in its rest position, a dieretaining member being pivoted downwards and held in position by a pivoted table.

A horizontal slideway 3 for the toolslide is secured to the counterplaten l of a horizontal metal section extrusion press, the counterplaten 1 being connected, through columns 2, with a press cylinder not shown in the drawing; the slideway 3 is secured to the side of the counterplaten facing the press cylinder. On this slideway there moves a toolslide 4 which encloses at its end, in a downwardly extending aperture 5, a dieholder 6 with die 7 and a bolster (pressure plate) 19. At the other end of the slide 4, in order to achieve a thrust, there is arranged the piston rod 8 of a hydraulic piston, Part of the lower enclosing portion is provided by a retaining member in the form of a pivoted plate 9 which is able to rotate about the pin 10. On the left-hand side of the lower slideway 3, a pivotal table 13 is pivoted to a plate 11 on the slideway 3 by means of a bolt 12; the table 13 may be raised and lowered by means of a piston rod 15 whose piston is pivoted thereto by means of a pin l4, and a fixed articulated cylinder 16. A die replacement system 17 is provided in addition to the pivotal table 13 and is fixed in position. Over the inclined track 18 of this system, the dieholder 6 or the bolster 19 is able to roll towards a catch member 22 which is moved in the direction of the aperture in the toolslide 4 by a piston rod 20 and cylinder 21. A shear 23 which acts vertically downwards at right angles to the axis of the press is located above the slideway 3 and is secured to the counterplaten l.

I claim:

1. A horizontal extrusion press counterplaten having a horizontal guideway located thereon and extending transversely to the press axis,

the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the bottom of the aperture being openable to allow the die to leave the aperture, and a member having its top portion profiled to close the bottom of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the member having its bottom in alignment with the bottom of the toolslide when the toolslide is in its working position and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position.

2. A counterplaten as claimed in claim 1, wherein the retaining member is pivoted to the toolslide.

3. A counterplaten as claimed in claim 2, wherein the retaining member and the toolslide act like a pair of tongs to retain the die in position.

4. A counterplaten as claimed in claim 2, wherein the pivot axis of the retaining member is beyond the end of the guideway when the toolslide is in its rest position.

5. A counterplaten as claimed in claim ll, wherein a pivoted table is provided for engaging the retaining member when the toolslide is in its rest position,

6. A counterplaten as claimed in claim 5, wherein the pivot axis of the pivoted table is at the rest end of the guideway.

7. A counterplaten as claimed in claim 5, wherein power means are provided for moving the pivoted table to move the retaining member into its closed position.

8. A counterplaten as claimed in claim 1, wherein the aperture is arranged to receive a die and a bolster and two said retaining members are provided, one retaining member for the bolster and one retaining member for the die.

9. A counterplaten as claimed in claim 8, wherein two pivoted tables are provided, for engaging the respective retaining members when the toolslide is in its rest position.

10. A horizontal extrusion press having a mount, an extrusion cylinder and a counterplaten as claimed in claim 1.

11. An extrusion press counterplaten having a guideway located thereon and extending transversely to the press axis, a toolslide having two sides guided by the guideway and movable between a working position and a rest position, the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the aperture'being openable to allow the die to leave the aperture, and a member having two sides, one side being profiled to close at least part of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the other of said sides of the member being in alignment with the respective side of the toolslide when the toolslide is in its working position, and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position.

12. An extrusion press counterplaten having a guideway located thereon and extending transversely to the press axis,

a toolslide having two sides guided by the guideway and movable between a working position and a rest position, the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the aperture being openable to allow the die to leave the aperture,

a member having two sides, one side being profiled to close at least part of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the other of said sides of the member being in alignment with the respective side of the toolslide when the toolslide is in its working position, and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position, and

a pivoted table for engaging said member when the toolslide is in its rest position.

13. A counterplaten as claimed in claim 12, wherein said member is pivoted to the toolslide.

Claims

1. A horizontal extrusion press counterplaten having a horizontal guideway located thereon and extending transversely to the press axis, a toolslide guided by the guideway and movable between a working position and a rest position, the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the bottom of the aperture being openable to allow the die to leave the aperture, and a member having its top portion profiled to close the bottom of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the member having its bottom in alignment with the bottom of the toolslide when the toolslide is in its working position and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position.

5. A counterplaten as claimed in claim 1, wherein a pivoted table is provided for engaging the retaining member when the toolslide is in its rest position.

11. An extrusion press counterplaten having a guideway located thereon and extending transversely to the press axis, a toolslide having two sides guided by the guideway and movable between a working position and a rest position, the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the aperture being openable to allow the die to leave the aperture, and a member having two sides, one side being profiled to close at least part of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the other of said sides of the member being in alignment with the respective side of the toolslide when the toolslide is in its working position, and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position.

12. An extrusion press counterplaten having a guideway located thereon and extending transversely to the press axis, a toolslide having two sides guided by the guideway and movable between a working position and a rest position, the toolslide having an aperture which is located on the press axis when the toolslide is in its working position, the aperture being for receiving an extrusion die, at least part of the aperture being openable to allow the die to leave the aperture, a member having two sides, one side being profiled to close at least part of said aperture and retain the die in position, the member being movable with respect to the toolslide to release the die from the toolslide when the toolslide is in the rest position, the other of said sides of the member being in alignment with the respective side of the toolslide when the toolslide is in its working position, and the member being profiled to be guided by the guideway and move with the toolslide into the working position of the toolslide so that the member is held closed by the guideway when the toolslide is in the working position, and a pivoted table for engaging said member when the toolslide is in its rest position.