US2925908A

US2925908A - Arrangement for the removal of the ingot surplus in indirectly operating extrusion presses

Info

Publication number: US2925908A
Application number: US529747A
Authority: US
Inventors: Harald J L Tornblom; Karl O A Pihl; Erik G M Hackzell
Original assignee: Svenska Metallverken AB
Current assignee: Svenska Metallverken AB
Priority date: 1954-08-25
Filing date: 1955-08-22
Publication date: 1960-02-23
Anticipated expiration: 1977-02-23

Description

Feb. 23, 1960 H. J. TORNBLOM ET AL 2,925,908 ARRANGEMENT FOR THE REMOVAL OF THE INGOT SURPLUS IN INDIRECTLY OPERATING EXTRUSION PRESSES Filed Aug. 22, 1955 2 Sheets-Sheet 1 1960 H. J. L. TORNBLOM ET AL 2,925,908

ARRANGEMENT FOR THE REMOVAL OF THE INGOT SURPLUS IN INDIRECTLY OPERATING EXTRUSION PRESSES Filed Aug. 22-, 1955 2 Sheets-Sheet 2 ARRANGEMENT FOR THE REMOVAL OF THE 1N- GOT SURPLUS IN INDIRECTLY OPERATING EX- TRUSION PRESSES Harald J. L. Tiirnblom, Karl 0. A. Pihl, and Erik G. M. Hackzell, Vasteras, Sweden, assignors to Aktiebolaget Svenska Metallverken, Vasteras, Sweden, a joint-stock company limited of Sweden Application August 22, 1955, Serial No. 529,747 Claims priority, application Sweden August 25, 19 54 4 Claims. (Cl. 207-1 inindirectly operating extrusion presses the ingot or blank is introduced in a so-called container or receptacle, the pressing plunger of the press or a sealing washer secured to the plunger being brought into abutting relation against the container, forcing the container over a die which is fixed to the end of a plunger, whereupon the blank is forced through the die. In the manufacture of tubes a mandrel is fixed on the sealing washer and carried downwardly through the bore of the die, the tube being formed in the space between the mandrel and the die. After completion of the extrusion of the blank, there remains on the side of the die facing the sealing washer a shell, that is, the so-called ingot surplus, which adheres to the extruded material and prevents it from being discharged from the press. In order to separate the ingot surplus from the extruded material a. special cutting means comprising a punch is commonly used. After the extruding operation has been completed, said punch is forced through the remaining ingot surplus to cut such surplus from the end of the extruded rod. This movement of the cutting means by the punch is commonly achieved by the pressing plunger being caused to press against the cutting means. At the same time the container is pressed away at least to such an extent that the ingot surplus will be located entirely outside the container or receptacle. The cutting means, after the removal of the pressing plunger, may be removed from the press. The ingot surplus then adheres to the cutting means and has to be removed before the means can be used again.

However, the cutting means are heavy in their handling and their introduction in and removal from the press respectively by hand will prove to be very troublesome work. Furthermore the removal by hand of the ingot surplus from the cutting means is a very troublesome procedure.

The present invention contemplates an arrangement, by means of which the ingot surplus may be removed without employing any substantial manual Work and without making the arrangement particularly complex. The nature of the arrangement is such that the removal of the ingot surplus may easily be made entirely automatic.

The arrangement according to the invention is such that the cutting means is mounted in a movable frame, so that the cutting means without requiring removal thereof from the frame may be moved to a position in alignment with the container bore, be displaced in the pressing direction for cutting off the ingot surplus, and together with the adhering ingot surplus returned in reverse direction to the pressing direction and thereafter be moved to a position outside the press for the removal of the ingot surplus.

In such procedure the movements of the cutting means to bemoved into position in alignment with the container bore and for removal therefrom are rendered possible by the fact that the means is arranged on a pivotally supported arm.

tes atent ice An embodiment of the arrangement will hereinafter be described with reference to the attached diagrammatic drawings, which illustrate the arrangement applied to a vertical extrusion press. The arrangement. may, however, also be adaptedjto extrusion presses having a horizontal or other arrangement.

Figure 1 is a part of a press including an embodiment of the invention shown in a vertical section. I

Figure 2 is a view similar to Figure l, but having the cutting means lowered and the ingot, surplus cut off from the pressed material.

Figure 3 is aplan view on line IIIIII in Figure4, the press indicated in Figures, 1 and 2 being also indicated.

Figure 4 is a vertical section showing how the cutting means is arranged in relation to thebase.

Figure 5 is a vertical sectionon line V-V in Figure 3 of the cutting means in its condition whenit has just been freed from the ingot surplus.

, In the drawing reference numeral 1 designates the receptacle of the press, which is supported for vertical movements .in a known way in hydraulic cylinders (not shown). Reference numeral 2 designates the press punch which is carried by a frame (not shown). Refer.- encenumeral 3 designates the pressure cylinder, in which the pressing or extrusion plunger 4 operates. Plunger 4 is provided on its undersidev with a sealing washer 5, which accommodates the bore of the container 1. Fixed to the underside of the, sealing washer is a. mandrel 6. Reference numeral 7 generally designates the cutting means, which has a lower washer or stripper plate 8 anda punchmeans consisting of a pipe 9, which down- Wardly terminates in a plate 10, atthe undeside of which is arranged a punch 11. The pipe 9 is provided with a vertical slot 12 of such a width that the cutting means may be moved inwardly above the container or receptacle bore without being obstructed by the mandrel 6. Threaded into the washer or stripper plate 8 is a number of bolts 13, which clears holes in the plate 10. The bolts extend upwardly beyond said plate and be? tween the plate and the head of the bolt is a compression spring 14, whereby the

parts

10 and 8 are retained against each other under the action of the spring force. Reference numeral 15 designates the die, diagrammati-. cally shown, attached to the punch 21 1 In Figure 1 reference numeral 16 furthermore designates the pipe that has been extruded through the die 15. After completion of the extruding operation the ingot surplus designated by 17 has been formed. As shown inFig, 1 after completion of the, extruding operation and prior to removal of the ingot surplus 17, the receptacle 1 has been moved with relation to the press punch 2 to position the ingot surplus 1-7 adjacent the upper end of the receptacle 1. For the removal thereof, after the cutting means 7 has been placed centrally above the container bore, the press plunger 4 is lowered so that the sealing washer 5 will be brought into contact with the pipe 9 lowering the cutting means down against the container. When the washer 8 has come into contact with the top edge of the receptacle, the receptacle will move downwardly with the washer 8 and the punch 11 will cut oif the ingot surplus 17. Such downward movement of the receptacle 1 will result in removal of the ingot surplus 17 from the receptacle. 1 as shown in Fig. 2. This results from the fact that the ingot surplus 17 is supported by the press punch 2' which remains stationary during downward movement of the receptacle 1. The parts thereafter occupy the position shown in Figure 2, wherein the pipe 16 is shown moving downwardly out of the cavity of the punch 2 after the pipe has been cut away from the ingot surpus. The ingot surplus now adheres around the punch 11.

Theremoval of the ingot surplus from the punch will be accomplished by means of the arrangements shown in Figures 3 to 5 inclusive and which will hereinafter be described.

In Figure .3 the position in the press 3a of the arrangement is shown as viewed from above and in full lines in the right portion of the figure. The cutting means 7, as shown, is fixed to an arm 18 which is piv otally supported from a vertical shaft 19 fixed to the base. The arm is fitted to the shaft 19 in such a way that the arm may be displaced in a vertical direction in relation to the shaft between the position shown in full lines and the position shown in dash and dot lines in Figure 4 corresponding to the positions shown in Figures l and 2 respectively of the cutting means. The vertical displacement of the arm 18 takes place in a direction downwardly of the press in a way previously described with reference to Figures 1 and 2, and furthermore returning of the cutting means 7 and the arm 18 to their upper position takes place by means of the spring 20 shown in Figure 4.

Arranged for the removal of the ingot surplus is the frame 21, shown in Figures 3-5, which is placed upon the base and into which the cutting means 7 may be swung. For this purpose the overhanging top 22 of the frame is provided with a recess 23, accommodating the periphery of the plate 10, the washer 8 being located on the underside of the top 22 as is best shown in Figure 5. Placed centrally in the frame on the base is a pusher means comprising a piston operating in a cylinder 24, onthe piston rod 25 of which is arranged a washer 26 providing a head.

Upon removal of the ingot surplus from the cutting means the arrangement according to the invention operates as follows: After the arm 18 together with the cutting means 7 has been swung to the left position shown in dash and dot lines in Figures 3 and 4, so that the plate 10 has been brought toabut against the top 22, the piston is raised in the cylinder 24 so that the washer 26 will press against an extension 27 .on the cutting punch 11. Said punch together with the parts '10 and 9 is now raised against the action of the springs 14 into the position shown in Figure 5. The punch 11 will now be urged upwardly by this operation out of the ingot surplus 17 which is retained against upward movement by the washer or stripper plate 8. When the washer 26 re turns to its starting position the ingot surplus, which has been removed from the punch 11, will remain loosely upon the washer and may be removed easily.

The invention is not limited to the embodiment shown and described but may be varied in several aspects Within the scope of the claims.

Having now particularly described and ascertained the nature of our said invention and in which manner the same is to be performed, we declare that what we claim is:

1. For use with an extrusion press having an extrusion die and a plunger in alignment therewith, an apparatus for removing excess material remaining after an extruding operation, said apparatus comprising a supporting arm pivotally and slidably mounted on an axis parallel to the axis of said plunger, cutting means carried by said arm and comprising a punch swingable about said pivotal mounting by said arm into and out of alignment with said plunger and extrusion die, a stripper plate slidably mounted on said punch, resilient means for normally retaining said stripper plate in retracted inoperative position, means on said punch for engagement by said plunger when said punch is in alignment with said extrusion die, whereby operation of said plunger will move said punch relative to said extrusion die to sever excess material from an extrusion, said excess material being in the form of a washer received on said punch, means to actuate said stripper plate to remove said washer from said punch comprising a frame mounted to one' side of the axis of said plunger and in the path of swinging movement of said punch, said frame having a recess and overhanging portion, said punch being swingable by said arm into said recess with said stripper plate disposed below said overhanging portion, a cylinder disposed below said overhanging portion and a ram in said cylinder in alignment with said punch when disposed in said recess, whereby upon movement of said ram into engagement with said punch, said punch will move relative to said stripper plate to strip said washer from said punch and upon retraction of said ram said resilient means will return said stripper plate to retracted inoperative position.

2. For use with an extrusion press having an extrusion die and a plunger in alignment therewith, an apparatus for removing excess material remaining after an extruding operation, said apparatus comprising a supporting arm pivotally and slidably mounted on an axis parallel to the axis of said plunger, cutting means carried by said arm and comprising a punch swingable about said pivotal mounting by said arm into and out of alignment with said plunger and extrusion die, a stripper plate slidably mounted on said punch, resilient means for normally retaining said stripper plate in retracted inoperative position, means on said punch for engagement by said plunger when said punch is in alignment with said extrusion die, whereby operation of said plunger will move said punch relative to said extrusion die to sever excess material from an extrusion, said excess material being in the form of a washer received on said punch, means to actuate said stripper plate to remove said washer from said punch comprising a frame mounted to one side of the axis of said plungerand in the path of swinging movement of said punch, said frame having a recess and an overhanging portion, said punch being swingable by said arm into said recess with said stripper plate disposed below said overhanging portion, a pusher disposed below said overhanging portion in alignment with said punch when disposed in said recess, whereby upon movement of said pusher into engagement with said punch, said punch will move relative to said stripper plate to strip said washer from said punch and upon retraction of said pusher said resilient means will return said stripper plate to retracted inoperative position.

3. For use with an extrusion press having an extrusion die and a plunger in alignment therewith, an apparatus for removing excess material remaining after an extruding operation, said apparatus comprising a supporting arm pivotally and slidably mounted on an axis parallel to the axis of said plunger, cutting means carried by said arm and comprising a punch swingable about said pivotal mounting by said arm into and out of alignment with said plunger and extrusion die, a stripper plate slidably mounted on said punch, resilient means for normally retaining said stripper plate in retracted inoperative position, means on said punch for engagement by said plunger when said punch is in alignment with said extrusion die, whereby operation of said plunger will move said punch relative to said extrusion die to sever excess material from an extrusion, said excess material being in the form of a Washer received on said punch, means to actuate said stripper plate to remove said washer from said punch comprising a frame mounted to one side of the axis of said plunger and in the path of swinging movement of said punch, said frame having an overhanging portion, said punch being swingable by said arm into a position with'said stripper plate disposed below said overhanging portion, a pusher disposed below said overhanging portion in alignment with said punch when disposed in said last named position, whereby upon movement of said pusher into engagement with said punch, said punch will move relative to said stripper plate to strip said washer from said punch and upon retraction of said pusher said resilient means will return said stripper plate to retracted inoperative position.

5 die and a plunger in alignment therewith, an apparatus for removing excess material remaining after an extruding operation, said apparatus comprising a supporting arm pivotally and slidably mounted on an axis parallel to the axis of said plunger, cutting means carried by said arm and comprising a punch swingable about said pivotal mounting by said arm into and out of alignment with said plunger and extrusion die, a stripper plate slidably mounted on said punch, resilient means for normally retaining said stripper plate in retracted inoperative position, means on said punch for engagement by said plunger when said punch is in alignment with said extrusion die, whereby operation of said plunger will move said punch relative to said extrusion die to sever excess material from an extrusion, said excess material being in the form of a washer received on said punch, means to actuate said stripper plate to remove said washer from said punch comprising a frame mounted to one side of the axis of said plunger and in the path of swinging movement of said punch, said frame having an overhanging portion, said punch being swingable by said arm into a position with said stripper plate disposed below said overhanging portion and means to move said punch relative to said stripper plate when engaged by said overhanging portion to strip said washer from said punch.

References Cited in the file of this patent UNITED STATES PATENTS 1,285,328 Neuberth Nov. 19, 1918 1,638,995 Hodge Aug. 16, .1927 1,664,990 Oehmig et a1 Apr. 3, 1928 1,976,447 Keck Oct. 9, 1934 2,728,453 Th-weatt et a1. Dec. 27, 1955