DE1452248A1 - Arrangement for closing off the billet receiver of an extrusion press - Google Patents

Description

Commissariat ά l'Energie Atomique, Par i 3 (France)

Arrangement to complete the block pick-up one

Extrusion press

The invention relates to an arrangement for locking provided with a die block receiver of an extrusion press, which makes it possible to temporarily the Block pick-up both on its press die and on the back of the press block located in the block pick-up complete to an even distribution of a previously

to effect introduced into the cavity of the block receiver lubricant on the periphery of the press blocka between this and the inner wall surfaces of the block receiver.

The principle of such an arrangement or such a method of lubrication is already described in the German patent specification ... (DAS 1 142 821) of the applicant. The arrangement described there provides for the use of closure or sealing pieces, which are made of metal parts which have a suitable mechanical strength . The rear closure piece preferably consists of one

410- (B 1328-3) -iP (0)

90980S / 0438

O 11 ** Ö

cup-drawn Bleah "whose edges are pressed by the lubricant pressure against the inner wall dea billet, while the front-side lock consists of a plate sandwiched between dio Preßicatriise and the die holder and Deia pressure in the press-of Preßfclockes in the pickup au start of the actual extrusion process is broken or pushed away.

The invention is based on the idea that it is expedient to replace the closure pieces or end pieces of the above-mentioned type, which, depending on the chosen design of these parts, require renewal at the end of each extrusion of a press block with new sealing pieces, in turn by movable members, which are permanently used and at given times can be brought into their final positions or withdrawn from them, such organs being provided on the one hand at the outlet end of the press matrix and on the other hand behind the block to be pressed in order to achieve a pressing of the lubricant into the block receiver and a suitable distribution .

For this purpose, one can use particularly a simple front-side sealing plug, the sieve slightly in the Aue occurs soffxttrag solves introduce the stamper, on the other hand a rear closure piece, which is sealingly connected to dea Preßetempel without the axial / this Steapela erachiβbung in the billet into for the implementation of the

300005/0430

hinder the actual Stran3pi? eßvorgange3 su · and in a manner known per se for a ra.ehmann this rear Yerschlußstüclc consists of a locking body made of metal, which can slide along the Preßstempelsehfif tes with the interposition of sealing means; this closing body is provided with means which allow it to be fixed in a sealing manner at the rear end of the block pick-up 8, preferably ± \ synchronism with the sliding movement of the ram.

The present invention is based on the object The above-mentioned arrangements also improve so that they in particular in particular allow the maintenance of a hydrostatic pressure of the lubricant inside the block receiver as well as attaching the locking body to the rear end of the block picker and holding it in the lock ellation during the entire duration of the pressing stroke of the erection ram which causes the extrusion process.

The arrangement according to the invention is essentially thereby characterized in that the relative movement of the Preßstempelsehaftfcs and the metallic sealing body, which ensures the seal on the back of the block receiver, is pressed in the lubricant is used under very high pressure inside the block receiver; this lubricant is preferably in a plastic state and at a suitable temperature in the interior of a SchaiertaittelvorratsrauBes annular shape held between the press ram

909 305/043 $

Shank on the one hand and the locking body on the other is, - ..

Under these conditions, the lubricant can be pressed from its storage space into the interior of the block receiver through the rear part of the press ram shaft, which is designed with a larger cross-section as a Yerdrängsteil, after the rear closing body is tightly attached to the block receiver; the injection can be carried out with a suitable pressure and the amount of the injected lubricant is exactly equal to that amount which is necessary to fill the still free space between the inner wall of the block receiver and the press block under the desired extrusion conditions. The lubricant is pressed in with the extrusion pressure with which the block is pressed; the volume of lubricant that is injected is relatively small when compared to the amount that would be necessary to fill the block receiver if the ram had not yet retracted into it. The ram also has the task of bringing the block into its starting position for the extrusion process in contact with the die and the injection of the lubricant is partly carried out at the moment when the block is advanced into this position by the ram .

As a result , the shaft of the ram moves relative to the rear sealing body by a path that is equal to the path required for the extrusion process

3088QE / G438

The press ram inside the block receiver3 is enlarged , a carriage length which is required for the previous pressing in of a given quantity of the lubricant «

These features essential to the invention are made up result from the following description of an exemplary embodiment illustrated in the drawing, which is for explanatory purposes only serves the invention, but in no way restricts it. In the drawing show:

Pig. 1 to 4 schematic axial sectional views of

essential parts of a horizontal extrusion press in which the invention is applied.

As can be seen from Fig. 1, the extrusion press shown schematically has a support head 1 on which a pressure plate 2 a die holder or base 3 is set for a press die 4; the press die 4 is at the outlet end of the cavity 5 of a block receiver 6 pressed on.

The previous closing of the press die 4 on the front side takes place by means of a locking pot 7 provided with an actuating rod, which is removed by any suitable means when the actual extrusion process begins . The other end of the block pick-up cavity 5 can in turn be closed by a metallic closing body 8 , which has a conical extension with its front end in the shape of a conical opening

90980570438

9 the end of the AafnehuierTiQhlva.vwes 5 penetrates.

The metallic cast body 8 is crossed by the eye 10 of an extruded thread 11, this shaft is extended to the right in the drawing in a stamp part 12 ₈ which has a slightly larger diameter than the central core part of the stamp. Iia inside the AbscIiließkSrgers 8 is check consequently to the Ereßstempslschsft 10 iieraai an annular cavity 1J _f forms a SehisieriBittelTmrratsESiisi and filled with a sufficient Henge a suitable "Seksierisittels ttber a Zuführfcanal 14 ksiiK _$ the hiiichircligeiit dureh the wall of the Abschließkörpers. 8 Baa complete oa @ r- partially filling the annular SehaierEittelratiCfes 13 ffiit Sciimieriaittei e-rfolgt by means of a · Hoclidruckpuispe or -Press (nieiit shown) welefee actuated wii * d α @ τ Preßstetapel UNAE _f wen. the Abschließkörper 8 sieve in the Öffmaigssteilung the extruder are as shown in FIG.

Are fig.'t the above-mentioned individual file in those Stelltmg shown that the entspriclit, the beginning of an entire Straagpreßsgielee in which a Ereßblock is brought 15 via a cradle-like support device 16 before the rear end of BlockanfGeiimess 6 "

In a first step, the PreSbiock 15 eats the build

nehmerhohlraußi 5 dui-cii the Prβΰstempel 11 pushed in the

908805/0438

U52248

is hiarsu concurrent end and r.usafinien moved with the Abschließkörper 8, the siim rear terminal DSSS billet receiver is used. When this closing body 8 with its conical mouthpiece has penetrated into the conical enlargement 9 of the cavity 5 and has thus sealed the cavity on the rear side, the press block is advanced further by the press ram until it comes into an ice position in which its front face is slightly Distance is located in front of the press die 4 (Pig-2).

In a second step, a suitable sealing pressure is created exerted on the locking body 8 by known (not shown) smock, either with the crosshead winches connected to the press or a screw winch or any other devices may be used to make the seal of the block pick-up through the locking body. In a third step, the ram is banned 11 is advanced steadily from right to left in the drawing, being during the beginning of this shift the still free cavity between the press block 15 and the inner cavity wall dee Aufnehmerhohlraurnes 5 with lubricant completely fills; this lubricant is pressed in by the movement of the rear displacement part 12 at the end of the Preßsteepelschaftes 10, the lubricant from the displaced cylindrical annular space 13. Ee is essential «dm

In this work step the pressure, with dom the lubricant

908805/0438 β »ο« »*.

is pressed in through the front plug 7 » the sitat in front of the Preßasatriiäe and consequently the ce press die seals tightly, is maintained? this Stopper must not leak any lubricant l

In a fourth step, the PreSsterapel 11 sets its own Displacement movement away, presses the press block 15 to the Mntrittsende the extrusion die and the actual extrusion process begins inner sealing of the press die opening by the press block the front sealing plug 7 removed. During the Feed movement of the ram, lubricant continues to be fait very high pressure as a result of the feed movement of the ram pressed into the transducer cavity.

When sufficient lubricant has been pressed into the receiver cavity 5, an outlet device not shown allows the excess which is present to escape Lubricant, while the one to carry out the_Strangpreß ~ The amount of lubricant necessary for the process itself continues to flow into the block receiver with the amount required for the extrusion process Pressure is introduced (j? Ig.4).

It should be noted that in the example described above, the seals used, in particular for the seal between the rear closure body 8 and the different ropes of the Preßsteopels, sliding wires

are that have good mechanical properties, so they withstand the wear and tear of friction and heat well. Zv: oekmäfifiigerweiBe the seals used are ring seals, those made of curved or appropriately shaped, enough elastic metal elements are made and a liquid lubricant can only pass in one direction permit.

For this purpose, its part in frictional contact with an opposite is preferably made of a metal which is softer than the steel from which the block receiver or an inner bushing, this block receiver and the shaft of the press ram are normally made. Preferably, these ring seals can also consist of two or more welded together metal layers, wherein the outer sheet or layer having suitable mechanical properties, to ensure good contact to achieve with steel, while the inner layer consists of a metal, which in the application or Working temperature has a high elastic limit.

Finally, it should also be mentioned that the strength of the block pick-up against tangential loads which can cause it to tear open is high. The hydrostatic bridge,! as they are more common in an extrusion press for extrusion ^: materials are required, values of 12,000 to -15,000 bar can reach.

Of course, the invention is by no means restricted to the embodiment described and illustrated in the drawing, which is only to be assessed as an example. '

909805/0438

Claims (3)

Claims / ν. Arrangement for sealing the cylindrical block receiver of an extrusion press, which is provided with a press die, the sealing on the outlet side by a closure piece releasing the die opening at the beginning of the actual extrusion process and on the rear side of the receiver by a closing body axially displaceable with the extrusion die, characterized in that The Abochlosekörper contains an annular lubricant storage space through which the punch shaft passes axially, and which contains the lubricant at a suitable temperature in a flowable state and the Stempelachaft has a displacement part, which during the advancing movement of the punch relative to the sealing body lubricant under high pressure on the lubricant chamber in the Block take-up presses. 2. Arrangement according to claim 1, characterized in that the rear portion of the Preß3tempelschaftes, which has a larger diameter, causes the displacement of the lubricant by means of the storage space in the interior of the block receiver after the closing body has been attached to the block receiver with a suitable sealing pressure is; the amount of injected lubricant is exactly the same 90S806 / G438 the amount that is available under the appropriate strand pike conditions that between the press block and the inner wall of the block pick-up fills the remaining space. 3. Arrangement according to claim 1, characterized in that the shaft of the press ram is relative to the closure body moved a distance equal to that for the Implementation of the extrusion process within the Blockauf taker required displacement length is increased by an additional path length that corresponds to the previous Sinpresseu one given Jchmierraittelieenge is required. 909805/0438