US2896782A - Tool arrangement for severing the extruded product in directly operating extrusion presses - Google Patents

Description

July 28, 1959 r P. BILLEN 2,

TOOL ARRANGEMENT FOR SEVERING THE EXTRUDED PRODUCT IN DIRECTLY OPERATING EXTRUSION PRESSES Filed April 16, 1956 k 5 Sheets-Sheet 1 July 28, 1959 P. BILLEN 2,896,782

TOOL ARRANGEMENT FOR SEVERING THE; EXTRUDED PRODUCT IN DIRECTLY OPERATING EXTRUSIQN PRESSES Filed. April 16, 1956 5 Sheets-Sheet 2 y 1959 P. BILLEN 2,896,782

- TOOL ARRANGEMENT FOR SEVERING THE EXTRUDED PRODUCT IN DIRECTLY OPERATING EXTRUSION PRESSES 7 Filed April 16, 1956 5 Sheets-Sheet 3 2,896,782 TOOL ARRANGEMENT FOR SEVERING THE EXTRUDED PRODUCT P. BILLEN July 28; 1959 IN DIRECTLY OPERATING EXTRUSION PRESSES Filed April 16, 1956 I 5 Sheets-Sheet 4 .PLBILLEN 2,896,782 TOOL ARRANGEMENT FOR SEVERING THE EXTRUDED PRODUCT July 28, 1959 IN DIRECTLY OPERATING EXTRUSION PRESSES Filed April 16, 1956 5 Sheets-Sheet 5 km .1 L f United States Patent C Peter Billen, Leverkusen-Kuppersteg, Germany, assignor to Schloe'mann Aktiengesellschaft, Dusseldorf, Germany Application April 16, 1956, Serial No. 578,245 Claims priority, application Germany April 16,1955

3 Claims. (Cl. 207-1) With directly operating extrusion presses it is known to use a tool arrangement wherein the matrix holder can be swung out of the operative position by means of a swingable arm adapted to pivot about an axis parallel to the axis of the press. In order to sever the extruded product from the remainder of the material the matrix holder is of knife-like construction so that as it pivots, sliding along the container, it can cut off or nip ofi the extruded product which has been formed. A severing operation of this kind cannot be carried out on steel owing to the latters hardness and toughness. The knife-like edges would be blunted too quickly. Also, when severing in this manner, the ends of the pressed length are deformed, resulting in waste of the pressed product. Deformation is particularly extensive when pressing tubes, so that considerable lengths of the end portions of the extruded products are unusable and have to be cut off.

The object of the invention is to obviate these disadvantages. To this end, it proceeds from the initially mentioned state of the art, namely from a tool arrangement for severing the extruded product in directly operating extrusion presses, preferably such as are used for pressing steel tubes, whose matrix holder is adapted to be swung out of the operative position by means of a swing able arm pivotable about an axis parallel to the axis of the container bore. The invention consists in that the swingable arm is displaceable in the direction of pressing. The matrix holder is allowed to follow the container when the latter is withdrawn, so that the length of pressing between the matrix holder and the counter-support can be cut off. If the matrix holder is moved forwards again without the container, space is provided between the latter two for ejecting the pressing remnant.

Removing the hot pressing remnant separated from the extruded product proper and then ejecting it from the container, is an unpleasant operation. In order to facilitate this, a collector for the pressing remnant ejected from the container can be arranged to be pivotable about the axis of rotation of the matrix holder. The said collector expediently consists of a cup which collects the remnant after it has been severed and, after rotation through about 90, lets it slide on to a chute or the like.

When steel is being pressed, it is often not possible to have non-stop operation, since the container has to be cleaned of the remnants of the lubricant used (glass or the like) between two pressing operations. Therefore the arrangement can be such, without impairing the working speed, that one of two arms rigidly connected together supports the collector and the other a matrix holder. The latter is expediently of U-shaped construction. The matrix is held therein by means of releasable pins or the like.

In order also to counter the danger that when the container is released from the matrixholder the pressing remnant would remain adhering to the container and not to the matrix holder, the front outer edge of the pressing disc is preferably bevelled off. The pressing remnant is "ice then located more securely in the container, so that the afore-mentioned danger is avoided.

Twoconstructional examples of the invention are illustrated in the drawings, wherein:

Figures 1, 2 and 3 show a tool arrangement according to the invention in three different working positions;

Figures 4 and 5 show another tool arrangement according to the invention, in two working positions; whilst Figure 6 is a horizontal sectional view of a steel tube press showing the arrangement of the tools according to Figures 1 to 3.

In Figure 6, 30 designates the bed of a steel tube press. A container 5 is displaceable in the longitudinal direction of the press on horizontal slideways 31. The means for displacing such containers are known and have not therefore been illustrated. The bore 6 of the container 5 serves to receive a heated steel ingot from which a tube is to be made by pressing. 8 designates a press ram which is fixed by means of a plurality of securing and pressure elements in a mobile crossbeam 32, which can also be .the mandrel 33 and a matrix or die 4. A steel tube 10 is thus produced, as shown in Figure 1. A counter-support 1, which is fixedly arranged on the bed 30, is used to take up, with the interposition of a pressure element 2,

the pressure which the ram 8 exerts on the matrix 4 by way of the steel ingot.

In Figure 1, 1 designates the counter-support of the press, against which bears the pressure element 2 which in turn serves as support for a matrix holder or die-holder 3 which carries the matrix 4. The pressing disc 7 of the pressing ram 8 is longitudinally displaceable in the bore 6 of the container 5. For the sake of greater clarity the mandrel 33 has not been shown in Figures 1 to 3. 9'

designates a pressing remnant or discard which remains in the press after the production of a tube 10 has been concluded. It is still attached to the pressed tube 10. Rotatable in the counter-support 1 is a hollow shaft 12, which is situated parallel to the axis of the container bore. It receives a shaft 11 which is rotatable with said shaft 12 but not relatively thereto, and it carries the pres sure element 2 on an arm or arm-like extension 14. The hollow shaft 12 can be rotated by a worm gear 34 or the like (Figure 6). Mounted on the shaft 11, whose end 11b projects out of the hollow shaft 12, are two arms 15 and 15a which each carry a matrix holder, 3 and 3a respectively. In corresponding fashion an arm 14a carrying a second pressure element 2a is arranged opposite the arm 14. As Figure 6 shows, the shaft 11 can be displaced longitudinally by a piston rod 35 with piston 36. This is brought about by admitting pressure fluid to one side or the other of the piston 36, which is arranged in a cylinder 37. The shaft 11 is not rotatable relatively to the hollow shaft 12, since it has splines 11a in which there engage keys 12a which are mounted fast in the hollow shaft 12. Whilst Figure 1 shows the position of the tools when the pressing operation has been completed, Figure 2 shows the container 5 in the retracted position. When it retracts it is followed by the arm 15,

which carries the matrix holder 3. This is possible be- I blade 16a can be introduced. The extruded pipe 10 is severed from the remnant 9 by means of this saw blade. Figure 3 shows a further position which can be reached after the severed tube 10 is drawn away to the left (Figures 13). After the tube 10 is severed, the shaft 11 is displaced to the left, so that the matrix holder 3 is released from the remnant 9. The two arms 14 and 15 are then rotated together to a certain extent so that adequate room is provided between container and counter-support 1 for expulsion of the remnant 9 by means of the ram 8 and its pressing disc 7. In order that the remnant '9 should not become detached from the pressing disc 7 when .the matrix holder 3 is lifted away, the pressing disc may be bevelled slightly at its outer periphery.

After the pressing remnant has been removed, the arms 14 and 15 are turned until the pressure elementla and the matrix holder 3a come into the operative position. The previously used tools 2 and 3 can then be cooled and cleaned whilst a new ingot is inserted in the container.

In Figures 4 and 5 a lever 15b one end of which carries the matrix holder 3b, is mounted on the shaft 11b. The said end is U-shaped so that the matrix can be pushed in between the two U-arms 150. It is held in the pushed-in position by a pin 46 which can be released manually when the matrix has to be removed. But in this case the opposite end of the lever does not carry another matrix holder but a collector 18 which, in the position shown in Figure 4, forms a cup 19 which is open at an angle in the outward direction. After the container is retracted and s.

the pressed tube severed, the said cup is swung towards the remnant, to collect the latter when it is pushed out. Then when the lever 15b is turned in the clockwise direction, the remnant slides with the pressing disc out of the cup on to a chute 20, so that the said remnant is brought automatically out of the zone of operation of the press. After the lever 15b is turned through 180", the lever takes up the position shown in Figure 5, wherein the matrix holder 3b is situated in the operative position.

I claim: 7

1. A tool arrangement for severing an extruded product from a discard in a direct-acting extrusion press, particularly in a press for the extrusion of steel tubes, comnot from a discard in a direct-acting extrusion press as prising: a container formed with a cylindrical bore, this container being movable in the direction of extrusion, a pressing dlSC shdable in the container bore, a press ram for impelling the pressing disc along the container bore, a rotatable and axially displaceable shaft parallel to the axis of the container bore,-an arm mounted fast upon the shaft, a die-holder secured to the arm and adapted in one position to bear against the container co-axially with the container bore, an extrusion die mounted in the dieholdertand adapted 'to be swung, by rotation of the shaft, into and out of a position in axial alignment with the container bore, the said shaft, arm, die-holder and die being adapted to move longitudinally with the container when the container is retracted, a counter-support adapted to take up the pressure exerted by the press ram through the pressing disc upon the material that is being extruded, and a saw adapted to be introduced between the countersupport and the die when the container is retracted from the counter-support and to sever the extruded product from the discard, leaving the discard still in the container.

2. A tool arrangement for severing an extruded product from a discard in a direct-acting extrusion press as claimed in claim 1, further comprising: a hollow shaft co-axially enclosing the axially displaceable shaft and rotatable therewith but not rotatable independently thereof, this hollow shaft not being axially displaceable, a

radial arm mounted fast on the hollow shaft, and a pressure element secured to this radial arm and adapted to be interposed between the counter-support and the die-holder when the die is swung into alignment with the container bore.

3. A tool arrangement for severing an extruded prodclaimed in claim 1, further comprising: a second arm,

mounted fast upon the axially displaceable shaft diametrically opposite to the arm that carries the die-holder and substantially integral therewith, and a collector secured to this second arm and adapted to receive the discard when ejected.

References Cited-in the file of this patent UNITED STATES PATENTS 1,317,238 Summey Sept. 30, 1919 1,574,792 Clark Mar. 2, 1926 2,388,558 Loewy Nov. 6, 1945 2,720,970 Roux Oct. 18, 1955 2,728,453 Thweatt et a1 Dec. 27, 1955

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