US 2491897 A
Description (OCR text may contain errors)
mm. m WQQ H. LORANT 2,491,897
CLOSURE PLUG Filed Aug. 5]., 1945 4 She'ets-Sheet l INVENTOR. 6 000 [OR/7N 7' A TTOENEYS Dec. 20, 1949' H. LORANT 2,491,397
' CLOSURE PLUG I Filed Aug. 31, 1945 4 Sheets-Sheet 2 INVENTOR.
Y #060 LORANT ATTORNEYS em 2% E949 H. LORANT 9 9 CLOSURE PLUG Filed Aug. 31, 1945 Sheets-Sheet 3 mvmron.
H060 Loam/v7 A 7' TOQNEXS ecu 1949 H. LORANT 2,491,397
CLOSURE PLUG Filed Aug. 31, 1945 4 Sheets-Sheet 4 INVEN TOR.
#060 (ORA/VT BY ATTO Y5 Patented Dec. 20, 1949 c ltll'TED STATES PATENT OFFICE CLOSURE PLUG Hugo Lorant, New York, N. Y. Application August 31, 1945, Serial No. 613,724
This invention relates to presses particularly adaptable for extrusion of metal into shapes, such as tubes or bars, and especially is concerned with the closing means for the extrusion die thereof when the billet is operated upon in the press before the extrusion operation.
One of the objects of the invention is to provide a simple means for converting existent presses so that billets may be placed in a container, compacted or operated upon, and then extruded. It is necessary to close the end of the apertured extrusion die while the compacting or other operation is being performed upon a billet in the container. The closure member may be made less than the diameter of the billet container so that when the billet is operated upon before actual extrusion, the end of the billet will come into contact with the portions of the die face around the closure member. Upon movement of the die with the closure in place relatively away from the billet container for the purpose of removing the closure element, which is followed by return of the die to extruding position at the end of the billet container, there will be no movement of the billet relative to the container.
Another object of the invention is to extrude large tubes from solid billets on existing presses in an economical manner. Previously there has been a large percentage of piercing scrap emerging from the large opening in the die. As an example, in prior processes when piercing a billet of 11 diameter a length of 20" using a mandrel of 7" diameter and a die opening of 8" for producing a tube 7" inside diameter and 8" outside diameter, the scrap would have a diameter of about 8" and a length of about representing about 26% of the billet weight. By the method of the present invention, by closing the die aperture during piercing, the piercing scrap of 8" diameter can be kept to a length of about 1 so that the scrap represents only about 3% of the billet weight. This is a saving of 23% which is very significant considering the weight of the starting billets.
Another object of the invention is to provide a simple detachable die closure member having a rod which may be extended through the die for attachment to a portion of the die holder. These and other objects of the invention will become apparent from the following description and drawings which are merely exemplary.
In the drawings:
Fig. 1 is a fragmentary vertical elevation partially in section of a press embodying the in- 2 vention, the hydraulic cylinder arrangement being omitted for purposes of simplicity.
Fig. 2 is an enlarged cross-sectional view of the die with the closure element therefor in place and the piercing plunger extended into the billet.
Fig. 3 is similar to Fig.2 with the exception that the die and closure have been withdrawn to the left so that the closure button can be removed.
Fig. 4 is similar to Figs. 2 and 3 with the exception that the die has been replaced and the piercing plunger or mandrel has been operated to push out the slug from the bottom of the pierced billet.
Fig. 5 is similar to Fig. 4 with the exception that the extruding plunger substantially has completed extrusion of the billet.
Fig. 6 is an enlarged view of the die and button closure element, a slightly different die holder or support being shown.
The press partially shown in Fig. 1 may be a standard press of the hydraulic or similar variety. In this press, a billet container 10 is supported in a frame I l which may be held directly on the main bed l2 of the press or carried by sub-frame or platen I3, sub-frame [3 being mounted on main bed I2. Sub-frame l3 may have an bydraulic cylinder arrangement 15 for raising and lowering wedge l6 through rod 45. Die holder or support I1 is reciprocably removable from guide 18 by operator l9, which is connected by rod 20 with hydraulic piston 2| in a conventional manner. Bar or trough 22 is connected to operator IS in any conventional manner, bar 22 serving as a guide and passing over the top of hydraulic cylinder 2| and sliding thereon as operator I9 is reciprocated. Mating plate 23 is carried by sub-frame l3. The bar or trough 22 may take any desired shape.
When die support 11 is in position, wedge 16 will act in conjunction with plate 23 to firmly wedge the die support I! and die against the conical or similar face 25 at the end of the billet container l0, apertured extrusion die 26 being mounted in die support I'I in recess 21.
Die support operator l9 may be connected through the stud, bolt, or equivalent means 28 to the die support. Die aperture button closure member 29 is locatable within the aperture 38 of the extrusion die 26. Said button, as will be described in detail hereafter, has a rod 3| or other suitably shaped member extending through aperture 30 and prolongation thereof. Rod 3| is removably connected at end 32 to trough 22. In order to make this connection on existent ma- .ing compacting or forging chines, it is merely necessary to bore a hole in bar 22 at 4% (Fig. 4) to receive the end 32 of rod 3|. The die and closure member are shown in Withdrawn position in dashed lines at 33 of Fig. 1 in which position the closure member may be removed from the apertured extrusion die by disconnecting or lifting rod end 32 from aperture 45 and removing the closure from the die.
One method of operating the device is to place a billet 34 into the bore 35 of billet container after said billet has been brought to a suitable temperature. Ring 36 is then placed against the end of the billet and hollow plunger 3? advanced by suitable hydraulic means (not shown) acting on head 38 (Fig. 1). Previous to this operation, die support l"! with has been moved axially into billet container closing position at the end of the boretfs as shown in Fig. l. The billet may then be compacted by hydraulic pressure being applied to plunger 37. At the completion of this operation, piercing plunger M! can be-advanced into the billet as shown in-Fig. 2, compacting plunger 37 having beendrawn away from ring 36 so as to allow the metal of billet 3i! to move to the right in the boretii asthe piercing proceeds. The metal at the left hand end of the billet in this operation completely forced around the button 29 of the closure element, said button preferably being of less transverse diameter than the bore 35 and extending beyond the face H of the extrusion die 26. The metal may or may not completely or partiallyflow around the button in the precedoperation depending upon force applied, temperature, etc.
The die support operator in is then moved to the left afterwedge it has been raised by hydraulically operated'mechanism l (Fig. 3), billet remaining ih'place in bore Z-ti'of billet container I'fi'and not being moved lengthwise to the bore 35. The closure button is then detached from trough'tz and removedfrom the apertured die bypassing rod 3i through the die aperture. The die support and die are then moved to the right intoc'on'tact with the end 25 of bore as shown in'Fig. 4. Piercing plunger ib thereafter is given further movement to the left as shown in Fig. 4 to'remove the slug 53 at the end of the partially piercedbillet of Fig. 2, the billet not being completely pierced when the die and'closure are in position so as to avoid possible injury to the closure and die. With the die and die support still in position, the hollow plunger 37 (Fig. 5) is moved-to the'left so as to extrude the billet to the tube shape seen at M in a well-known manner.
Solid shapes also may be extruded by omitting thepiercingoperation. In this event, it might be desirable toprovide a cup-shaped form to fit against the-end of the billet so as to insure flow of metal completely around the button-shaped closure member and against the face of the die during the forging operation.
'In Fig. 6 is seen an enlarged view of the die arrangement showing more of the details of one specific construction of the die which may be varied to suit the particular conditions. The same reference characters are used to represent the same parts when appropriate. Die support II is slightly different than that shown in previous figures in that there is a cut away portion at the top of recess 2? thereof. Dieholder 25 may have an inserted die 4'! with support Q8 and a spacer ring t9. Button 2? has a surface 58 fitting against the face A! of the die'and a portion 5| extending within the aperture 38] of the die. Rod
the die and closure in place 3| may be threadedly or similarly fastened at 52 to the die closure. When the rod is put into engaging position, the closure element will be properly held in the die aperture and against the face of the die.
It is preferable that the billet 34 be operated upon in such a manner as to cause flow at the edges 53 into contact with the face 4| of the die. Then when the die is retracted for closure removal andreplaced there will be no movement of the billet within the bore 35 caused by -the die. It has been found desirable not to move the billet in the bore container during this operation and only to have substantial relative movement between the face of the bore and the surface of the billet during the actual extrusion or similar operation. The shape of the button 29 may be made as shown or'si'milar thereto-so'as to facilitate flow of metal to theform shown.
It will be understood that various changes and modifications may be made from those specifically illustrated without departing from the spirit of the invention or scope of the appended claims.
1. In a metal extrusion press, an apertured die with a face, a billet container with a bore therethrough, means to reciprocate said die andbillet container relative to each other, said-die'being movable to the end of said bore-a button closure supportable on the face of'said'die adjacentthe die aperture, said button being of Iless diameter than said bore and extending intosaid bore of the billet container from the fac'e'of the diewhen said die is at the end of said bore, and means maintaining said button closure in'place'on said die when said die and billet container are'reciprccated relative to each other.
2. In a metal 'eiitrusion press having an extrusion chamber, an apertured die having 'a'mouth,
moving means, a button closure member having a portion in said extrusionchamberofgreater' diameter than the aperture of the die, said "portion being supportable by the "mouth'of said-die from longitudinal movement'when workingfor'ce is applied thereto, and 'a'roda'dapt'edto extend from said button through said'die aperture and adapted to be removably connected to sai'd'rll'e moving means to holdsaid button in closing'position in said die.
3. In a metal extrusion'press having anextrusion chamber, an apertured diehavingamouth and face, die moving means, a button "closure member having a portion in said-extrusion chamber of greater diameter than'the aperture of the die,'said portion being supp-ortableby the'mouth of said die and adjacent portions of the face from longitudinal movement when "workingforceis' applied'thereto, and means removably securing said die, closure member and diem'oving means in assembled relationshipsothat-said-die and closure member can be moved toapositi'on where the closure member can be removed'fromthe'die opening.
REFERENCES CITED' The following references areof record-in'the file of this patent:
UNITED STATES PATENTS Number Name Date 682,360 Keithley Sept.'10,"1901 2,112,085 Friden Mar.'22,"1938 2,388,558 Loewy Novi'fi', 1945