US2531663A - Punching and drawing press - Google Patents

Description

Nw., 28, R95@ O. F. A. BIGINELLI ET AL PUNCHING AND DRAWING PRESS 2 Sheets-Sheet l Filed Dec. l2, 1947 INVENTORS ATTORNEYS Nw., 1950 o. F. A. BIGINELLI ET AL PUNCHING AND DRAWING PRESS 2 Sheets-Sheet 2 Filed DGO. l2, 1947 INVENTORS Patented Nov. 28, 1950 UNITED STATES PATIENT @OFFICE PUNGHING AND DRAWING PRESS` Greste Flavio Alfred 'BiginellL Pietro Alexanilro Maggiorinc Biginelli, and Alexandro Giovanni Battista Andrea Biginelli, ClermonteFerrand,

`France Application December 12, 1947,-Serial No. 791,436 in France December 27, 1946 1 Claim. l1

Metallic cases of cylindrical shape `are generalliy worked on mechanical presses which successively effectuate `the operations which consist in .cutting out `the blank, dishing said blank, drawingfthe dished piece.

.It is :then necessaryto arrange different presses following one another and successively effectuating the three operations of cutting out, dishing anddrawing; each of said presses being made especially yfor one of said operations.

Furthermore, each Vpress is generally provided with afdevice supplying the pieces automatically and increasing thecapacity of production of the press.

The -plant which is necessary for making the finished cases is thus very important and very expensive since it comprises three presses and three automatic piece supplying devices.

The present invention has for its object to remedy said inconveniences.

The invention relates to a machine for the manufacture Aol deep metallic vessels such as cases, characterized in that female cutting out, dishing and drawing tools are arranged axially after one another which makes it possible, in one andthe same `working operation, to cut out, dish and 4'draw the blank in order to obtain a deep vessel `in its definitive shape.

According to a form of execution of the invention the female cutting out, dishing and drawing tools are combined with male tools such as punches actuated by a press mechanism.

According to a feature of the invention the punches Kcomprise a out out punch and a dishing and drawingpunch concentric with the preceding one and capable of projecting through this :cut out punch which makes it possible successively to effectuate the cutting out of the blank and `then the deformation of said blank.

According to a form of execution of the invention a retaining device such as an extractor is arranged after the female tools in order to retain lthe worked piece while the dishing and draw" ing' punch returns to its initial position after its Working stroke.

The invention also covers a machine characterized in that the `dishing and drawing punch alone receives the thrust of the `press mechanism, the cutting out punch being capable, at certain moments, of being rendered fast with said dishing and drawing punch. According to a feature of the invention the dishing `and drawing punch passes axially through the cutting out punch which vis fast with a Istop able lto recede, the dishing and drawing punch carrying along the cutting out punch in its movement when it strikes against the :stop of the latter.

Lastly, the invention covers the features which will be described now and Vtheir various possible combinations.

.A machine made in accordance with the invention isshown `by way of example in the appended drawings, in which:

Figure l is a sectional axial view, the cutting out and .dishing punches :being in their raised position.

Figure 2 is a sectionalaxial viewshowing the machine at the `moment when the cutting out punch comes into VContact 4with the `strip to be cutout.

Figure 3 is a .sectional ,axial view of the `machine, the cutting out punch being at the end of Tits working stroke.

Figure 4 is a sectional `axial view ofthe machine showing the Ydishing `punch at the end o its Working stroke.

Figure 5 is a cross-sectional view of this machine through line 5-5 of Figure 1.

Figure l6 ris a crossesectional `View `of Ythe machine through line S-Brof Figure 2.

Figure '7 is a cross-sectional view of `the ma' chine'through line 'I-l of Figure 3.

The apparatus 4shown in Figures l to 7 iorms only the Working `device ci the machine, it being `actuated through a press mechanism of known type.

It comprises the ,following essential elements:

(l) A iixed casing fast with the yoke of the press and formed of two parts I and 2 assembled through four screws 3 so as to provide between them a rectangular port `serving as a guide for the passage of the metal strip.

(2) A movable rod 5 entirely fast with the press work and sliding along the longitudinal axis of the stationary casing.

(3) A sliding -sleeve 6 which can be rendered fast with the rod 5 or remain independent of said rod. This sleeve 6 can slide in the casing 2 on a rather reduced length while the rod 5 itself can slide in the bore of the sleeve.

(4) Female tools arranged in the central bore of part I of the casing (I, 2). These to'olscomprise from the top to the bottom:

(a) A ring I the upper `part B of which `acts as a die for cutting out the 'blank and the lower part of which serves as a dishing die (b) A series of drawing rings `Ill, II, I2, I3, four in the case Aof `the example shown, the did ameters 'of which are more and more reduced from the top to the bottom. These rings IIJ, Il, I2, I3 are maintained spaced from one another, as desired, through a series of spacing rings I4, I5, I6, Il. The upper ring I4 outwardly comprises a groove 25 into which open holes 26 which, on the other hand, open into the inner bore of the ring I4.

The groove 25 of the ring I4 is placed opposite the opening of a passage 21 provided in the casing I. A pump, not shown, forces oil through the passage 21, the groove 25 and the holes 26 into the -bore of the ring I4.

The whole of the drawing dies I0, II, I2, I3 and of the spacing rings Ifi, i5, I", il is located in the axial bore of part I of the casing; it is maintained in said bore through a sleeve i8 locked through a washer i9 itself maintained applied against the casing I through a nut 2G screwed on said casing. The washer l and the nut 20 are provided with an axial hole 42.

The sleeve i3 comprises in its upper part a conical bore 2l against which the six clamping members such as sectors 23 of an extractor 22 are pressed through a spring 24 located in the sleeve i8. rilhe spring 24 rests, on the other hand, on the washer The six sectors 23 of the extractor 22 which are shown in Figure 6 have each an opening of 60 and form through their bringing together a continuous ring resting through a conical part against the conical bore 2I of the sleeve I8.

(5) Male tools formed of:

(a) A dishing and drawing punch 23 secured through a nut 29 to the end of rod 5;

(b) A cutting out punch 3d secured through a nut 3| to the lower part of the sliding sleeve E; said cutting out punch 3U comprises an axial bore 32 rendering possible the passage of the dishing and drawing punch 28.

The above mentioned punches can be rentiered fast with one another by means of a capnut 33 screwed on the upper part of the sliding sleeve E and against which the nut 29 which is fastwith the punch 28 can come to rest.

lThree radial keys (Figures 1 and 7) are slidably mounted in three guides spaced by 120 and provided in the sliding sleeve These keys are urged by a pin-spring 35 which tends to move them apart radially and to cause them to rest against the internal surface of the cylin- I drical part 2 of the casing.

This internal surface comprises in its upper part a iirst cylindrical bore then a second cylindrical bore 3l of larger diameter connected with the iirst bore through a conical bearing surface 3S the angle of which is about 45 with respect to the general axis. Lastly, the cylindrical bearingv surface 3l blends with the general bore Q3 of the casing through a transversal bearing surface M, acting as a stop.

The radial keys Sie, which are moved away resiliently through the springs 35 can thus occupy two positions:

(o) The position of 'Figures l and 2 in which the keys Se in contact with the restricted part of conical bearing surface 323 are brought nearest to the general axis.

In this position the keys 35i form through their internal end which projects into the bore of the sliding sleeve a stop icr the nut 29 which is fast with the punch 2t.

(o) rEhe position of Figures 3, 4 and 7 in which the keys 34 spaced from the axis through the springs 35 rest against the bore 31 which forms the'bottom of the groove.V In this position the keys 34 do no longer project into the bore of the sliding sleeve 6 and the nut 29 can slide freely in said bore.

The above described machine Works in the following manner:

The metallic strip 4 which is chosen with a width larger than the diameter of the blank which will be punched out by the cutting out punch Sii is introduced into the space forming a guide between parts I and 2 of the casing (Figures 1 and 2, 5). The dishing and drawing punch 28 is in its upper position and maintains the cutting out punch 3s in its higher position owing to the fact that the nut 29 strikes against the cap-nut 33 which is fast with the sliding sleeve 6 (Figure 1).

The press-work being actuated the dishing and drawing punch 28 begins its downward stroke, the nut 23 comes then to strike against the keys 35i which project into the bore of the sliding sleeve t and carries along this sleeve and the cutting out punch 3i] in its downward movement. Figure 2 shows the position of the various organs at the moment when the cutting out punch comes into contact with the strip 4 during its downward stroke.

During the further downward movement of both punches 28, 3B which are fast with each other the punch 35 cuts out the blank 4 on the upper ring 8 and forces it into said ring 8 without deforming it till the beginning of the dishing die In this position the cutting out die is locked owing to the fact that the nut 3l strikes against the bottom of the bore of the casing 2 (Figure 3). t the same time the keys 34 which are resiliently moved apart from one another through the springs 35 engage into the groove formed through the bore with the large diameter 3l and free the nut 29 which can then continue its downward movement with the punch 28 while the sleeve is held fast through striking against the casing 2 (Figure 3).

Therefore, the dishing and drawing punch continues its downward movement alone. During this stroke the dishing of the blank through the die S and then the successive drawings through the rings ill, II, I2, I3 are effected successively. At the end of the downward stroke the punch 28 occupies the position shown in Figure l and carries at its end the nished piece such as a case el.

Then the press mechanism produces the displacement of the head in the reverse direction, the punch 23 rises again, the sectors 23 of the extractor 22 are forced through the spring 24 into the conical bore 2i Where they press against case si and through clamping oppose any upward displacement of said case. Therefore, the punch 28 gets free from the case 4I which is held fast in the axial passage 42 and which will be ejected during the following press stroke by the following piece through the axial hole 42 of the nut 2U.

Towards the end of the upward stroke of the piston il@ the nut 29 comes to strike against the cap-nut 33 and carries the sliding sleeve 6 with it in its upward stroke which causes the raising movement of the cutting out punch 30.

In this upward movement of displacement of the sliding sleeve S in the casing I the keys 34 are forced back towards the axis while compressing the springs 35 through sliding of the outer end of said keys against the conical part 28 which forms an inclined plane. Then the keys 34 project again into the inner bore of the slid- 5 ing sleeve 6 and the various organs are again in the initial position of Figure l.

The freed strip 4 can then be shifted longitudinally either manually or automatically by a length somewhat larger than the diameter of the blank cut out by the punch 30.

While the strokes to and fro of the punches are eifected an abundant supply of oil provided at 21 opens through the medium of the groove 25 and of the holes 26 into the inner bore of the dies. This oil has for its duty to lubricate and to cool the tools, punches and dies; it flows out through the ejection hole t2.

The above described machine makes it possible to insure numerous technical advantages and more particularly the following ones:

(l) It makes it possible to obtain a piece such as a case from a metal strip by means of a single machine and with a single press stroke which produces the cutting out, dishing and drawing operations simultaneously,

The work is thus rapid and the efficiency of the machine is very high.

(2) The machine according to the invention can be fed through an automatic supplying device the Work of which is reduced to the supply of the strip to the machine which is a simple and not very expensive device.

In short, the machine made in accordance with the invention makes it possible to obtain together with a high eiciency a plant comprising only a single machine and a single automatic supplying device, thus a plant which is much less important and much less expensive than the known plants which comprise machines i for each operation and automatic feeding devices for each machine.

We claim:

In a machine for the manufacture of deep metallic containers such as cases from a continuous metallic strip, the combination comprising a casing of generally elongated form, divided into an upper portion and a lower portion by a transverse slot for guiding the strip to be cut,

said upper portion having a cylindrical recess,

a sliding sleeve displaceable in said cylindrical recess, a cap mounted upon the upper portion of said sliding sleeve, a conical bore forming peripheral inclined slopes in the internal face of said cylindrical recess throughout all of its priphery, a cylindrical enlarged bore provided in said cylindrical recess below and following said conical bore, a cutting punch carried at the lower end of said sliding sleeve, a dishing-drawing punch sliding axially in said sliding sleeve and capable of projecting beyond said cutting punch, pressure means, an assembling nut connecting the upper portion of said dishing-drawing punch to said pressure means and forming an abutment against said cap for raising said sliding sleeve by said dishing drawing punch, radiating keys mounted radially slidingly in said sliding sleeve, springs applied to said radiating keys and maintaining them in exterior engagement with said conical bore and said enlarged boring, said radiating keys being thus capable of projecting into the bore of the sliding sleeve when they are in exterior engagement with the walls of the conical bore and thus forming an abutment for said nut in its descending stroke, said radiating keys being moved aside when they are in contact with said enlarged cylindrical bore which permits the projection of said dishing-drawing punch across said immobilized cutting punch, cutting female dies, dishing female dies, drawing female dies, said female dies being disposed axially following one another in the interior of the lower portion of the casing upon the trajectory of said punches.

ORESTE FLAVIO ALFRED BIGINELLI. PIETRO ALEXANDRO MAGGIORINO BIGINELLI. ALEXANDRO GIOVANNI BATTISTA ANDREA BIGINELLI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 23,095 Keller Mar. 29, 1949 530,915 Adams Dec. 18, 1894 1,720,375 Parker July 9, 1929 2,369,260 Slater Feb. 13, 1945 2,389,738 Olney Nov. 27, 1945 2,412,813 Keller Dec. 17, 1946

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