US3119493A - Extrusion presses - Google Patents

Description

Jan. 28, 1964 3,119,493

F- J. ZILGES EXTRUSION PRESSES Filed June 27, 1960 4 Sheets-Sheet 1 t2 INVENTOE 1. cf. Z z/Lyea Jan. 28, 1964 Filed June 27, 1960 F. J. ZILGES EXTRUSION PRESSES 4 Sheets-Sheet 2 4 Sheets-Sheet 3 Fiied June 27, 1960 WVENm/Q FJZges United States Patent 3,119,493 EXTRUSION PRESSES Franz losef Zilges, Rheydt, Germany, assignor to Schioemann Aktiengesellsehaft, Dusseldorf, Germany Filed June 27, 1960, Ser. No. 39,165 Claims priority, application Germany .luly 1, 1959 4 Claims. (Cl. 207-1) This invention relates to an extrusion press with an axially retractable container, and with at least one holding arm, which is rotatable about an axis parallel to the axis of the press, for the purpose of rocking the die holder and a die into the working position, and is displaceable in the direction of the press axis for the purpose of enabling the extruded product to be severed between the die and a bolster. In such presses, upon the retraction of the container, particularly when bridgedies are employed (that is, dies with which a press mandrel or forging die is provided by means of radial ribs), a strong pull is exerted upon the die adhering to the container by means of the extrusion material. This pull produces a strong tilting moment of the arm carrying the die upon its pivot, so that the arm and the pivot, together with their bearing, have to be very stoutly constructed.

The object of this invention is to provide such a method of construction as will enable the tilting moment exerted by the die-carrying arm upon its shaft to be taken up in a more advantageous manner.

The invention consists in providing, on the bolster of the press, a sliding member, which prevents axial movement of the die and die-holder and/or of the rotary arm.

Particularly advantageous is a construction in which the die (or the die-holder) has two opposite abutment surfaces, one of which engages behind an abutment of the rotary arm, whilst the other projects out of a forkshaped aperture in the rotary arm, and is engaged over by the bar when slid forward. With such a construction only half the pull is transmitted to the rotary arm, and this represents a considerable relieving of the latter.

If the slide is provided with arms that overlap the rotary arm, a considerable portion of that pull which is transmitted from the die to the rotary arm is further transmitted to the slide, whereby a further relieving of the rotary arm and of the structural elements associated with it, particularly the pivot or shaft, is obtained.

For taking up the force that still accrues upon the rotary arm, the shaft carrying the rotary arm, which, for the purpose of axial displacement of the die is longitudinally slidable in a hearing, may, in that position in which the die bears on the bolster, extend with its end into a second bearing, in which it can be locked against longitudinal displacement.

The invention also admits of being advantageously adopted when a second rotary arm carrying intermediate pieces is provided. In this form of the invention the arrangement is such that the intermediate-piece rotary arm can be coupled to the die rotary arm in such a way that the die rotary arm can be rotated either alone or together with the intermediate-piece rotary arm.

Further details of the invention will be gathered from the following description of one form of construction of the invention which is illustrated by way of example in the accompanying drawings, in which:

FIGURE 1 shows a cross section through the press after withdrawal of the container, on the line II in FIGURE 2;

FIGURE 2 an axial section on the line =IIII in FIGURE 1;

FIGURE 3 an axial section on the line III-III in FIGURE 1, but with the individual parts of the press in different relative positions; and

FIGURE 4 a diagrammatic plan view of the press as a whole.

The bolster 1 is connected in the usual manner, by means of four tie-rods 40, with the main extrusion cylinder 41, in which a press piston moves when pressure liquid is forced into the cylinder through pressure pipes 42 alternately. The bolster 1 and the cylinder 41 are stationary upon a foundation. Between them a container holder 29 enclosing the extrusion container 28 and its sleeves 27 is slidable, by means of two rods 43, which at their ends are attached to pistons 44, which are movable to and fro in stationary displacement cylinders 4 5, when pressure liquid is introduced through hydraulic pressure pipes 46 alternately.

In the bolster 1 (FIGURE 2) is fitted a pressure body 2, with an inserted pressure-piece 3. These three parts are invariable relatively to one another in the operation of the press. An intermediate piece 4 is mounted on an arm 5, which is connected with a hollow shaft '6, which is rotatable about a shaft 7. Against the intermediate piece 4 bears a die pressure body or ring 8, against which, in its turn, the die 9 bears. The pressure body 8 and the die 9 are held together by a die-holder 10, which is mounted on a rockable arm 11, which is mounted fast upon the shaft 7. The rockable arm 11 may advantageously be made double, that is to say, there are two arms 11 extending in opposite directions from the slidable shaft 7, the second arm carrying a pressure body 8a, a die 9a and a die-holder 10a, exactly corresponding to the pressure body 8, the die 9 and the die-holder 10 carried by the first arm 11. The arm 5 may similarly be made double, and may carry a second intermediate piece 4a. The arm 11 embraces the die-holder 10 with two ends 12 and 13 like the prongs of a fork. As shown in FIGURE 2, the die-holder 10 and the forked ends 12 and 13 have shoulders .14, by means of which the dieholder is prevented from moving towards the right, in FIGURE 2. On the bolster 1 is so mounted as to be longitudinally slidable a sliding member 15, which is displaceable in a horizontal direction (compare FIG- URES 1 and 3) with the aid of a hydraulic cylinder 16 and a hydraulic piston 17. While FIGURE 3 shows the outer position of the slide 15, FIGURE 1 shows its inner position. In this inner position the slide overlaps, with a semicircular abutment 18-, a corresponding abutment 19 on the die-holder, which corresponds to a similar abutment 2% on the opposite side of the die-holder. The die-holder is therefore prevented from moving towards the right (in FIGURE 2) on one side by the rotary arm 11, and on the other side by the slide 15. Over the prongs .12 and 13 of the rotary arm engage arms 21 and 22 of the slide 15, which, owing to the shoulder surface 23, prevent the prongs of the rotary arm 11 moving towards the right in FIGURE 2. The slide 15 is guided underneath in a dovetail-shaped groove 25, and above in a groove 26, so that in the manner that is usual with sliding bars it is permitted to move longitudinally but not to move transversely. Against the die 9 is set the sleeve 27 of the container 28, which is mounted in a container-holder 29, which can be drawn back towards the right by means of rods 43 and pistons 44-, as shown by FIGURE 4. The shaft '7 can be displaced towards the right, into the position shown in FIGURE 3, by a piston 30, which is movable to and fro (FIGURE 3) in a cylindtr 31. The hollow shaft *6, with the arm 5 can be rotated by means of a pinion 32, which can be coupled to the hollow shaft by a clutch 33. The pinion 32 is non-rotatably but slidably mounted on the shaft 7, so that when the pinion 32 is driven, either the shaft 7 3 alone or the shaft 7 together with the hollow shaft 6 can be rotated. If the shaft 7 is shifted to the left (FIG- URE 3), its left-hand end passes through an aperture 34 in the bolster, and assumes the dot-and-dash position 7a.

In this position it can be locked by pushing in two sliding bars 35, so that it can then no longer be displaced to- Wards the right.

During extrusion the individual parts assume the positions shown in FIGURE 2. When the contents of the container sleeve 27 are substantially extruded through the die 9, there remains an extrusion residue, by which the die 9 adheres rather firmly to the container sleeve 27. This is particularly the case when the die 9 is constructed as a so-called bridge-die. The sliding bars 35 are then released, and the slide 15 is slid towards the right (FIGURE 1). Thereupon the container 28 is moved towards the right (FIGURE 3), in which case it generally pulls after it the die 9, together with the die pressure ring 8. The shaft 7 is thereby also drawn to the right, so that the position according to FIGURE 3 cours. The extruded product 37 is thereupon severed with a saw 36, whereupon the container 28 is moved to the left again into its original position. The sliding members 35 and 1 are closed again. If the container 28 now travels to the right, it tears itself free from the die 9, for which purpose however a considerable tensile tfiorce usually has to be employed. This tensile force is substantially transmitted to the slide 15, and only to the slightest extent to the shaft 7, which, in order to be able to take up its share of the tensile force, is still held by the sliding bars 35. The displacing piston and cylinder 30, 31 need not therefore be very strongly constructed. The intermediate piece 401, which is rocked out of the Working position, may be taken out of the arm 5, and replaced by another tool, which has been cooled.

I claim:

1. An extrusion press, comprising: a bolster, a container axially movable towards and away from the bolster, a shaft parallel to the extrusion axis, a rotary holding arm mounted fast on the said shaft, a die-holder carried by the rotary holding arm, and so held as to prevent any axial displacement of the die-holder relative to the rotary holding arm and to the shaft, the shaft being rotatable for the purpose of rocking the die-holder into and out of the working position, and being axially slidable to enable an extruded product to be severed from an extrusion residue between the die-holder and the bolster, a slide so mount-ed on the bolster as to be movable towards and away from the extrusion axis, an abutment on said die holder facing said container, and means on said slide engaging said abutment upon movement of said slide toward said extrusion axis to prevent movement of said die holder away from said bolster.

2. An extrusion press as claimed in claim 1, further comprising: two'abutments on the die-holder, on opposite sides of it, a shoulder on the rotary holding arm adapted to engage one of these abutments, and an abutment on the slide, adapted, in the inwardly displaced position of the slide, to engage the other abutment on the die-holder.

3. An extrusion press as claimed in claim 2, the rotary holding arm being forked to engage the die-holder between its prongs, and the slide comprising arms adapted, in the inwardly displaced position of the slide, to engage the prongs of the forked holding 'arm.

4. An extrusion press as claimed in claim 1, further comprising locking means to prevent longitudinal displacement of the slidable shaft when the die-holderhas approached the bolster, the said locking means including a bearing into and through which one end of the shaft passes as the die-holder approaches the bolster, and a slidable locking bar'adapted to engage the shaft end after it has passed through the bearing.

References Cited in the file of this patent UNITED STATES PATENTS 8 19,26-1 Wood May 1, 1906 1,326,138 Putnam Dec. 23, 1919 2,326,606 Biggert Aug. 10, 1943 2,633,777 Hoern Apr. 7, 1953 2,896,782 Billen July 28, 1959 FOREIGN PATENTS 1,163,770 France Apr. 28, 1958

Claims (1)

1. AN EXTRUSION PRESS, COMPRISING: A BOLSTER, A CONTAINER AXIALLY MOVABLE TOWARDS AND AWAY FROM THE BOLSTER, A SHAFT PARALLEL TO THE EXTRUSION AXIS, A ROTARY HOLDING ARM MOUNTED FAST ON THE SAID SHAFT, A DIE-HOLDER CARRIED BY THE ROTARY HOLDING ARM, AND SO HELD AS TO PREVENT ANY AXIAL DISPLACEMENT OF THE DIE-HOLDER RELATIVE TO THE ROTARY HOLDING ARM AND TO THE SHAFT, THE SHAFT BEING ROTATABLE FOR THE PURPOSE OF ROCKING THE DIE-HOLDER INTO AND OUT OF THE WORKING POSITION, AND BEING AXIALLY SLIDABLE TO ENABLE AN EXTRUDED PRODUCT TO BE SEVERED FROM AN EXTRUSION RESIDUE BETWEEN THE DIE-HOLDER AND THE BOLSTER, A SLIDE SO MOUNTED ON THE BOLSTER AS TO BE MOVABLE TOWARDS AND AWAY FROM THE EXTRUSION AXIS, AN ABUTMENT ON SAID DIE HOLDER FACING SAID CONTAINER, AND MEANS ON SAID SLIDE ENGAGING SAID ABUTMENT UPON MOVEMENT OF SAID SLIDE TOWARD SAID EXTRUSION AXIS TO PREVENT MOVEMENT OF SAID DIE HOLDER AWAY FROM SAID BOLSTER.

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