DE1452359A1 - Circular saw for separating the press residue from the press material on a metal extrusion press - Google Patents

Description

(Documents intended for the printing of the published patent application)

THE LOEWY ENGINEERIMG COMPANY LIMITED Bournemouth

Wallisdown Road 551 «553 England

"Circular saw for separating the pressed residue from the pressed material on a metal extruder "

The invention relates to a circular saw for separating the pressed residue from the pressed material on a metal strand. press with a pivotable pendulum arm that carries the circular saw blade and one that is fixed to the press and axis of rotation parallel to the pressing axis.

Such circular saws are widespread. If the saw is not used, the pendulum arm is locked in the position in which the saw blade is withdrawn from the path of the material to be pressed cuts through and thereby separates the pressed residue from the pressed material, in general between the counter holder and the block buyer of the press,

Particularly in the case of large extrusion presses, the Pendelaria must be measured for a long time so that the saw can be seen in

Pgienf onwötte 0ipf.4ng. Martin ticbi, Dipl.-Wirtsdiv-Irtg. Axef Hansroann, Ptj

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is at the same distance from the path of the pressed strand, as long as it is not needed. As a result, however, the saw may become excessively heavy. Sometimes it is further difficult or impossible to provide an unobstructed path for the saw to pivot widely from the retracted position to the cutting position. This applies in particular to presses with four tie rods. Further difficulties have arisen in cases in which the material to be pressed has a flat rectangular cross-section of considerable width or the like is designed. Then it can happen that the saw has to cut through so much material that its blade is in the middle of the Cutting organ gets stuck. This can lead to damage of the saw and its drive and therefore to an operational '» Lead interruption of the press, which results in a corresponding failure in production.

The invention is now based on the object of providing a circular saw for cutting off the press backlog on a metal extrusion press to create in which these deficiencies are avoided.

This object is achieved according to the invention in that an intermediate lever between your pendulum arm and the axis of rotation is inserted.

If the saw is out of operation, the pendulum arm is folded up against the intermediate lever. The saw then forms a compact unit, the small footprint of which makes it easier to attach to all types of presses, including those with four tie rods. The movement of the saw blade from its retracted position into the cutting position takes place in two stages. In the first stage, the intermediate lever and the pendulum arm swing around the fixed axis of rotation on the press. in which the bearing imprint is located in an axial plane which is perpendicular to the longer side of the reolitic angular cross-section of the pressed material, or is located close to this axial plane. Pich can

move freely on the saw blade. Does it a horizontal extrusion press, then this runs

0OÜ44 / O447

The plane is usually perpendicular and accommodates the press axis. In The saw blade is in this ready position close to the pressed material in order to cut through it. In the next operating stage, the intermediate lever is held, uud the pendulum arm swings around its bearing axis, with the saw then making the cut. Does the material to be pressed have a flat surface rectangular or similar cross-section, then the saw blade cuts into the strand at one of its Narrow sides one or close to it and leaves the strand on the other narrow side or close to it. Consequently Only a relatively small part of the saw blade dips into the material of the strand during the cutting process. The risk of the saw blade getting stuck is therefore avoided.

In the known circular saw, the pendulum arm is pivoted by a piston-cylinder unit supported on the press. The piston / cylinder unit supported on the press preferably engages the intermediate lever and is also a piston-cylinder unit between the pendulum arm and the intermediate lever arranged.

Purely another / \ * corner than for the guidance of a circular saw, it is already known, an intermediate lever that between a pendulum arm and an axis of rotation is inserted, pivotable around the axis of rotation fixed to the press and parallel to the press axis for discharging the press residue package. In this known arrangement, the piston-cylinder unit supported on the press also engages on the intermediate lever on and between the pendulum arm and the intermediate lever is a second piston — cylinder — arranged by the «unit.

The invention will now be described in detail using an exemplary embodiment explained, which is shown in the drawings »In these show:

Fig. 1 is a partial longitudinal section through a lying Metal extruder along the section line I-I of Fig. 3 for

909844 / OU7

Representation of that end of the press, at which the, pick-up, the die unit and the counter holder are arranged,

FIG. 2 shows a section corresponding to FIG. 1 with from the retractor withdrawn from the die, exposing a section of the pressed material for sawing through,

Fig. 3 the (cross-section along the line III-III of Fig.2 with the saw blade in a retracted position,

FIG. 4 is a line drawing according to FIG. 3 the saw blade is in the ready position, and.

FIG. 5 shows a section corresponding to FIG. 3, at which the saw blade is in the cutting position.

Only that part of the press is shown in the drawings. shows, which needs to be explained in order to understand the invention.

The counter holder IO of the press is secured by four tie rods connected to a hydraulic cylinder not shown in more detail, in which the main drive plunger 12 of the press is movable. The tie rods are arranged so that their axes pass through the corners of a pike. before the counter holder is at some distance from it a block receiver 13, which is arranged in a housing 14 and is attached to this by wedges 15. The billet receiver 13 and its housing 14 are in the direction of the press axis X-X displaceable by a drive not shown in detail. A ram 16 is attached to the main drive piston 12, which can be moved into the pickup I3, as Fig. i shows. The ram carries on its front side a press disk 17.

On the side of the counter-half facing the transducer I3 ters 10 is a die carriage 20, the upper one and lower guides 21 and 22 attached to the counter holder 10 are. The slide is made up of a cylinder and piston Ordering hydraulic drive 23 (Fig. 3) displaceable in the horizontal direction transversely to the press axis X-X. Of the

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Ready position is located immediately next to the material to be pressed. The bearing point 35 comes into a position that is located close to the Y-Y plane. At the next level of the In the process, the intermediate lever 37 remains stationary, while the pendulum noise 32 swings over its bearing point 35 and thereby the saw blade 30 passes transversely through the extruded strand A, so that the residue is separated (Fig. 5). The saw blade enters the material to be pressed at one of its Narrow side and leaves the pressed material on its other narrow side. This is due to the fact that the bearing point 35 during of the cutting process is very close to the vertical axial plane of the press.

If the cylinder and piston units 42, 43 and 46, 47 are in the retracted position, the hydraulic fluid is preferably trapped on the retraction side of the piston so that the units are in this position being held. This prevents the pendulum arm 32 from swinging unintentionally about the axis of rotation 38 and the saw blade 30 goes down to about the middle of the press. As a further safety measure, one can use the Schwatiz extension 40 arrange a counterweight.

After the pressing residue has been separated off, the parts are swept back to their original positions. It is not necessary that the saw blade 30 is first in the hereitsohaftsstellung transforms; rather, the saw blade can be transferred to the withdrawn position of FIG. 3 on the next path. For this purpose, the two drive units 42, 43 and 46i 47 driven simultaneously, saving time will.

It is true that the embodiment described is a horizontal extrusion press with four tie rods which are arranged at the corners of a rectangle. It goes without saying, however, that the invention can also be applied to extrusions in which the tie rods are provided in a different number and a different arrangement. Also, the invention in stationary extrusion can UUD with lying and standing St i M

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Claims (2)

(Documents intended for the printing of the disclosure document) ■ PATENTANSFUÜCBL · 1. Circular saw for separating the pressed residue from the pressed material on an i ^ letall extrusion press with a circular saw blade supporting swiveling pendulum arm and an axis of rotation fixed to the press and parallel to the press axis, characterized in that that between the pendulum arm (32) and the axis of rotation (3s) an intermediate lever. (37) is inserted. 2. circular saw with a KoI-ben -ylinders-Liiiheit supported on the press according to claim 1, characterized in that the piston-cylinder-Linheit supported on the press engages the /.wischen lever (37) and that also between the Peiulclarm (32 ) and the / wischenhebeI (37) a piston-cylinder-Linheit (Ί6, k "7) is arranged. 909844/0447 rfct, λ ι—, Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian HerrrtWnn