DE2225635A1 - Closure cap made of sheet metal and method and device for their production - Google Patents

Description

• PATENT LAWYERS '. ααα _Γ * λ _Γ

_{D | PL PH} ys or J fricke DR.-ING.R. DDRING DIPL.-PHYS, DR. J. FRICKE

BRAUNSCHWEIG. MONKS

Continental Can Corporation, Inc., 633 Third Avenue, V.ev: York 17,! 1.Y. / UNITED STATES

"Cap made of sheet metal so; ie method and device for

their manufacture "

The invention relates to a sealing cap made of sheet metal Cap body and a cylindrical skirt section borrowed in v / es, the one near its free end has a ring-shaped one Securing tape arranged over in the circumferential direction at intervals narrow webs are integrally connected, between which partially annular slots apron section and securing band separate. The invention also relates to a method and a device for producing such a closure cap.

It is well known to provide closure caps each having a securing band integral with the lower edge of the apron section is connected by curchbreehbaren webs or tongues. When using such Closing cap on a bottle, the securing strap is locked to the bottle neck, so that the connecting webs must be broken to remove the cap from the bottle neck to be able to unscrew. ·

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The securing band is formed from an extension of the Sch (Ir :: enabschnittes of the closure cap and is from this with the exception of the connecting webs through perforations or
Slits in the skirt portion of the closure cap are separated. The production is normally carried out in a rolling process, which requires a rotation of either the closure cap or the tool making the slots or perforations.

The closure caps are usually roughened with one
Unifangs section, which is usually in the form of a
There is knurling to facilitate turning of the cap. This knurling is usually done as well
Rotation of the closure cap produced and requires separate tools compared to those that are used to produce the holes or slots in the closure cap to the securing tape
to build. .

It is also known that closure caps are made from flat sheet metal blanks through a series of stamping and forming operations. These operations necessarily require different facilities compared to those used to produce the knurling and perforations in the closure cap to serve.

It is the object of the invention to develop a closure cap of the type described in more detail in such a way that for the manufacture

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provide the knurling just as little as for the production of the perforations or slots in the closure cap a rotary movement of the tool or the closure cap is required, in particular both processes according to ϊ-'possibility in a single Work step should be carried out with the same tool set.

This object is achieved according to the invention in that the partially annular slots delimiting each other at a distance from one another.

overlying edges of the apron section and securing tape

S.

are reinforced by integral splashes. The planes can be curved in radial cutting planes and two-sided be curved according to opposite leases, whereby they can complement each other across the slots.

To produce the new closure cap, the invention is based on a method in which from a sheet metal blank Deep drawing initially produces a cap-shaped body with a bottom and an essentially cylindrical skirt section .by the securing band is then formed by machining the separating slits in the apron section.

It is the object of the invention to develop this method further, so that for the production of the separating slits in the apron section neither a rotary movement of the tool nor the closure cap is required. '.

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According to the invention, this object is achieved in that a leg; Production of the cap-shaped body of the area adjoining the free edge of the apron section, forming a ring-shaped shoulder is widened, in front of all separating slits in a single joint pressing process by shearing in The direction of the cap axis of the sheet in the area of the shoulder is generated over limited circumferential areas. Due to the' Formation of the closure cap \ and due to the new process the production of the slots can be carried out in a simple pressing process, which is done on a conventional compression molding machine, ie can take place during the normal manufacturing process of the closure cap. .

Furthermore, the invention is based on a method in which. in the area of the skirt section adjoining the cap base a knurling is produced. This method is preferred in connection with the method for producing the Slots according to the invention developed so that for generating the knurling on a multitude of · in the circumferential direction uniformly distributed points from the transition area between the skirt section and the floor progressing in Direction away from the bottom, the skirt material is deformed radially inward in the direction of the cap axis. Appropriately the knurling takes place at the same time as the shearing of the limited shoulder areas by someone in lease Cap axis running pressing process.

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BATH ORIGINAL

Furthermore, the invention goes to. Carrying out the method from a molding press, which has several press statics and in which each cooperating Frßformsten.pel sun; Forming a flat sheet metal blank into a cap-shaped body with a bottom and skirt section.

It is the object of the invention to further develop such a compression molding press that on the same press with corresponding pressing tools, the apron section of the securing band-separating perforations.

According to the invention, this object is achieved by a further Press station rat an inner punch for reception and support of the cap-shaped body from the inside, over one shoulder having connected cylindrical sections, of different outer diameters, and one opposite the inner punch in Direction of the cap axis, relatively movable bell-shaped outer die, which in its cross-over the cap-shaped body, essentially cylindrical inner surface in Umfarigsrichtung has shear edges distributed and interacting with the shoulder of the inner punch.

Furthermore, it is an object of the invention to develop such a compression molding press of the known type in such a way that with it without Generation of a relative rotary movement between, / tool and Closure cap a knurling in which the. Cap bottom middle ee-

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BATH

rich of the apron section can be generated.

This object is achieved according to the invention by a cap-shaped sheet metal body from the inside supporting inner punch, which is in the adjacent to the end face supporting the cap base Circumferential section through several in the circumferential direction radially outwardly projecting, axially extending webs has separate depressions, and through one to the inner punch in the axial direction relatively movable bell-shaped, the sheet metal body overlapping outer punch, which is close to its bottom several radially protruding from the inner original surface, axially elongated shaped projections in radial and axial alignment ir.it the recesses.

The webs and depressions as well as the shaped projections are advantageously on the inner and outer stems of the pressing station planned for the new press, with the .in the same station as well the slots are created by shearing.

In the preferred embodiment, these are relative to one another movable punch designed so that they simultaneously produce the perforation and the knurling on the caps, whereby these forming dies together with other forming die sets, which are used for punching out a sheet metal blank and forming the Closing cap are used in a common press so that the caps are in a row of equal-

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ORIGINAL

early pressing processes in the final form. can be brought. .

In the new process, a sealing cap blank can first be used produced v / earth, which has an apron section, which in the lower area by an outwardly inclined Shoulder is expanded. Then, during a pressing process, the sheet metal is gripped by shear edges in the shoulder area and sheared off with the exception of a plurality of circumferential in Narrow webs arranged at intervals. The partially severed loop section or the securing tape is then subsequently used Kit uses the same tools and moves axially in the same station with respect to the rest of the cap, to create a space between two opposing cut edges.

The cut edges are generated in a rectangular shape in such a way that the lower edge of the apron

cut of the cap and the upper "edge of the security tape Have reinforcing flanges or curls.

To carry out the method, the device can have a Stamp set 'have the shear edges and the cooperating shoulder in the lower area and in the upper area which has shaped projections and grooves which are used to produce the knurling.

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BATH ORIGINAL

The shaped projections of the bell-shaped press ram are preferred easily exchangeable cylindrical pins. forms, which can be hardened and which in corresponding holes of the stamp can be used.

The invention is explained below with reference to schematic drawings explained in more detail using several exemplary embodiments.

Fig. 1 is an exploded side view through a die set with parts broken away and in section are shown and in which a preformed closure cap blank is in a position in which it can be edited with the help of the stamp set.

FIG. 2 is a partial bottom plan view of that indicated in FIG. 1 Section plane 2-2.

Fig. 3 is a plan view of the lower forming die looking in the direction of plane 3 ~ 3 indicated in Fig. 1.

Fig. 4 is a vertical partial section through the forming dies, which are in the fully retracted position. The stamps are shown at the end of the forming step for producing the knurling.

Fig. 5 is a partial section in a horizontal plane, which is shown in Fig. K with 5-5.

FIG. 6 is a partial section along the sectional plane SS of FIG. 5.

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I ₁ «AD ORfGfWAL

"j

FIG. 7 is a partial section through FIG. 4 drawn j

Section 7th-7th, while j

Fig. 8 on a smaller scale a part:. \: T by an an- ' whose Forrastercpelsatz reproduces, c! e "" for finishing-i

• »■ i

processing of the cap after producing the knurling and ¹

of the backup tape is used. "''

In Fig * 1 is a partially formed closure cap according to I

. ■. ■ ί

of the invention, which is denoted by 10. The Ver- . >

Closing cap 10 comprises an end wall or a cap base il

and a fuselage section 12. The fuselage section 12 is cylindrical [

drisch and in the form of a Schilrzenabschnittes whose larger j

Part is denoted by the reference number 13. The fuselage ^:

• Section 12 comprises an extension 14 which is connected to the section '

13 is connected by an outwardly offset shoulder 15:

which generally shows an S-shaped profile in cross section. ■ \ The extension 14 has a one piece at the bottom edge:

outwardly directed flange 16. * - '· ·

The bottom wall 11 comprises a floor mirror 17 and a general! my stepped section ¹ 18 which is integrally connected to the body section 12 I, 'j

It can be seen that the closure cap 10, as shown in Fig. ■ 1. is only partially formed. It can also be seen that the closure cap 10 consists of a flat _t

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• SADORIGlNAt

Sheet metal cutting; through a series of pressing operations by others Stamp sets are produced, polygamy all in a single stamp press arranged and operated at the same time.

According to the invention, further work steps are carried out on the closure cap 10 carried out according to FIG. 1, through composite and relatively movable stamp, which one have upper die set 21 and a lower die set 22. The stamp set 21 'comprises a stamp 23, during the. lower punch set 22 a cooperating centering * stamp / has, which is mounted on the corresponding round press plate. ·

The centering punch 24 is partially designed in such a way that it provides appropriate support for the closure cap 10 during both the knurling and the shearing process, it being assumed that in the example shown both! · '· Operations are carried out with the same stamp set 21 and 22. The centering punch 2k includes a lower portion

.j 25, the shape of which is closely recorded in the skirt section Ik

j will.

. · A central portion of 2entrierstempels ^ 2k is sawn with 26 records "'and has a contour shape to ^J, around the lower part of the skirt portion 13 during the combined Arbeit3-

J gears to assist. The upper part of the centering punch 2k

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is designed in such a way that it interacts with the punch 23 during shearing off.- This will be described in more detail below. The centering punch 2k ends in an end wall 27 'which engages the underside of the bottom 17 of the closure cap and serves to hold the closure cap 10 in the correct axial position.

The lower forming punch set 22 furthermore comprises a drawing ring 28 which engages telescopically over the centering punch 2M and is floatingly mounted opposite it, as is customary, in order to be able to interact with the punch 23.

The punch 23 has a generally hollow cylindrical shape and has a hollow cylindrical bottom section 30 ′ and an ejector 31 which is received in the upper section and which is correspondingly supported separately by the rod 32. The bottom section has an inner diameter such that the punch can grip freely, but with a relatively tight fit, over the skirt section 13 of the closure cap.10. The bottom section 30 ends in a lower section 33 with a larger inner diameter, which is internally designed so that it can interact with the centering punch 2h when the extension section 1'i is formed. The enlarged inner diameter of the lower portions 29 results in that the _y Eodenabschnitt 30 has a sharp annular edge that is effective as an annular Schorkante 3'1 ,:

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BATH ORIGINAL

The underside of the ejector 31 ends in a lower end face 35 which lies opposite the upper end face 27 of the centering punch 2h and, with this, serves to support the bottom 17 of the closure cap 10. The ejector 31 also has an inner generally frustoconical surface 36 which extends radially outwardly and downwardly from the underside 35 to engage and support the stepped portion 18 of the closure cap 10.

With particular reference to FIGS. H _t 5 and 6 it is clear that the upper portions of the punch 23 and the Zentrierstercpels 2h are formed so as to provide the upper portion of the bottom portion 13 with a knurl when the plunger 23 axially pushes the centering punch 2h. In order to reliably support the stepped end wall IS of the closure cap, the upper part of the centering punch 2h has a correspondingly stepped outline shape, as indicated at 37. Below this section of the centering punch 2h and above the central part 26 of the centering punch 2h , the upper part of this punch is cut out in the circumferential direction, namely in the form of a plurality of circumferentially spaced projections 38 and intervening grooves JJO, as can be seen most clearly Fig. 5 is evident. The projections 38 are part-cylindrical in their outline shape and end in upper corners hl, which lie opposite the surface 36 of the ejector 31, and cooperate with this in order to

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Ren part of the stepped wall 18 of the closure cap to support.

These parts of the centering punch 24, which define the recesses 40, extend up to above the corners 41 and are offset radially inward relative to the corners 41 in the form of corners 42, which also cooperate with the surface 36 of the ejector 31, around the stepped end section 18 to support the cap ¹ . This is clearly shown in Figs. . ■

It is readily apparent from the foregoing description that the centering punch 24 is designed so that it has a radial inward deformation of the upper part of the closure cap 10 allowed, which also includes the 'portions of the stepped portion 18 to the knurling of the upper To effect part of the closure cap. To make the To enable knurling by an axial relative movement of punch 23 and centering punch 24 is how best to do it 1, 2 and 5 is apparent., The punch 23 wit inward projecting, circumferentially spaced shaped projections 43 provided, which have a part-circular Have cross-section. Each of these protrusions 43 ends in a rounded lower edge 44, as best shown in FIG. From Fig. 5 it can be seen that each projection 43. radially in alignment with a recess 40 in the centering

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stamp stands. "

It is' easily understood from Figs. K> 5 and 6, daß'während the initial sliding over each other of the punch 23 and the Zentrierstempels 2k deformation of the partially preformed closure cap of FIG. 1 does not take place. However, after the bottom section 30 has been pushed over the section 13 of the closure cap 10 sufficiently far to support the central part 26 of the centering punch "2k to support the upper body section 13 of the closure cap against deformations directed radially outwards, the rounded lower ends kk arrive of the projections kj> in contact with the peripheral outer parts of the stepped side wall portions 18 and cause an initially inward and downward deflection of this wall portion at circumferentially spaced locations. When the punch 23 and the centering punch 2k their relative movement in the axial direction continue, the projections 43 progressively push the metal of the upper portion of the closure cap into the recesses kO in the manner shown in Fig. 5. At the same time the metal of the closure cap is drawn around the projections 38 with the end result that the upper part the misc Lußkappe 10 has a sinusoidal corrugated or knurled shape in cross section. The knurling of the closure cap 10 is shown in FIG. 8 and is identified by the reference number ^J 15.

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BAD ORiGINAL.

It can also be seen from Fig. H that the bottom of each recess h0 by a downwardly and outwardly inclined. Shoulder 46 is determined, which only cooperates with the rounded lower edge of each protrusion Ij3 in order to calibrate

transition of the knurling back into the cylindrical Eunpfabschnitt 13 to ensure the closure cap 10, as shown in deniFig. 4. And 8 can be seen

It is pointed out that before the completion of the change process causes the lower part of the closure cap 10 to be severed in a manner to be described below will. The knurling process is ended simultaneously with the completion of the sawing process.

With particular reference to FIGS. H and 7, it is clear that the central part 26 of the centering punch 2h dips into the base portion 25 of the punch through a generally conical shoulder 47. The shoulder 47 is arranged below the shoulder 15 of the cap 10 ■> when the closure cap 10 · fully seated with its bottom 17 on the upper end wall 27 of the Zentrierstempels 24th

• On a number of circumferentially spaced The centering punch 24 with rounded seats is places 48 provided, which protrude from the shoulder 47 upwards and are formed and arranged to be attached to the shoulder

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- ΐβ -

15 attack and support them. The seats ^ 8 have a small expansion in the circumferential direction.

With particular reference to FIG. 11 , it becomes clear that when the punch 23 reaches a position in which the interlocking of the punch is almost complete, the shear edge J> k engages the shoulder 15 of the closure cap 10, v / the same is supported on the centering punch 2 * 1. The shear edge 3'i engages approximately in the middle of the shoulder 15. At this point it should be noted that the shoulder 15 has a shape such that the skirt extension lh is located radially outside of the body portion 13, namely at a radial distance which is slightly greater than the thickness of the metal from which the closure cap 10 is formed is. It is readily apparent, in particular from Fig. ^1, J, that the shearing edge 3 ^ when it moves in relation to the shoulder 15 downwardly, wherein the upper region of the closure cap 10 against a downward movement, through the Zentrierstempel 2k is hindered, the shoulder 15 is cut in half. When the shoulder 15 · of the closure cap has been sheared in half, the skirt section Ik and the lower half of the shoulder 15 are moved downwards, with the aid of the punch 23 · During this movement, the skirt section Ik is supported by a flange 16, which is on the. Draw ring 28 is seated, which moves downwards together with the flange. The lower half of the shoulder 15 finally sits on the school · * ·

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- 17th kj _ of the centering punch 2k .

It is clear that the shearing of the shoulder 15 by the shear edge Jk in the circumferential direction is not complete, but is interrupted at intervals. As can be seen from FIG. 7, the underside of the bottom section 30 is interrupted by radially extending slots 49 which are in alignment with the seats' {δ. As a result, the shear edge J> k is interrupted in the area of the seats kB and the shoulder 15 is not severed. If, however, the apron section Ik is moved downwards with the aid of the punch 23 after the shoulder has been severed, the areas of the shoulder 15 that have not been severed are stretched in a generally axial direction Bridge sections, which are denoted by the reference numerals 50 in Figs. K, 7 and 8.

It is also easy to see that the effect of the punch 23 goes beyond a pure shearing action to the extent that the punch 23 moves the sheared material further axially downwards. So the function of the stamp set is more than only that of the separation process. Rather, the function can literally be referred to as a perforation process will.

It is noted that when the shoulder 15 is sheared off, the

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Closing cap 10 the general shape of the severed halves the shoulder is preserved with the result that when finished Closure cap, as can be seen from FIGS. H and 8, between the webs 50, the lower edge of the Ruir.p fabschnitt it by an outwardly directed flange 51 and the upper edge of the securing band 52 by an inwardly directed one Flange 53 is reinforced. The flanges 51 and 53 are located facing each other on opposite sides of the associated slot 54, the flange 53 and the adjacent portion of the tape 52 serve to cover the sharp edge of the flange 51 until the closure cap of the associated Container has been removed.

Referring again to FIGS. 1 to 5, it is clear that the projections ^ 3 are not formed integrally with the punch 23 but form separate pins 55. Each pin 55 is received in a bore 56 in the forming die 23. By separate manufacture of the pin.e 55 * which those

The pins 55 can be made of a hardened material which are parts of the die set which are subject to increased wear can be produced so that they have a long service life. It can also be seen that the pins 55 within the associated bores 56 in any desired May be kept interchangeable.

After the closure cap has been formed, the electrode section 11

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the closure cap with a corresponding lining GO in any way desired. Thereafter, the closure cap is subjected to a trim cut, with the help of a Trimming punch set 61, which has a centering punch 62, which serves to support the security tape 52, and a trimming die 63 which is dimensioned so that it is the security tape 52 surrounds with a tight fit and supports this, the edge portions of the centering punch 62 and the trimming punch 63.with each other cooperate 'to · the flange' 16 in the in Fig. 8 Shear off as shown. '"

It is easy to see that by arranging and using suitable tools of the stamp cypes for the production of the necessary Knurling; and "securing the necessary perforation areas" "for Formation of a safety band and the production of sealing caps in a much simpler way can be done with much simpler tools. The stamp sets, as they are described can be in a usual

Stamp press with similar types of stamp sets to the previous one Punching and pulling can be used.

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Claims (2)

- 20 - *
Patcntar.sr smells Closing cap made of sheet metal with one. 'Afrenboden and an essentially cylindrical skirt section, which near its free end is connected in one piece with a ring-shaped securing stand via oblique webs arranged at intervals in the original direction, between which partially ring-shaped slots separate the skirt section and the securing band, characterized in that: that the partially ring-shaped slots (5 ^) delimiting, nit spaced opposite edges of the skirt section (13) and securing band (lh) are reinforced by integral flanges (51 or 53). 2. Closure cap according to claim 1, characterized characterized .. -that the flanges (51 and 53) are curved in radial sectional planes. 3. Closure cap according to claim 2, d ad u r c h gekennzei cn η et that the flanges (51 or 53) are curved in opposite directions and spread across complete the slot (5 ^ 0. ¹ J. A method for producing a closure cap according to claim 1 to 3, in which first a cap-shaped body rr.it a base and a 209851/0101 'BADORIG.NAL essentially cylindrical apron section is produced in which the securing band is then formed by machining the separating slits into the apron section, characterized in that when the cap-shaped body is produced, the area adjoining the free edge of the apron section is expanded to form an annular shoulder, whereupon all Separating slots can be produced in a single common pressing process by shearing in the direction of the cap axis together in the shoulder of the sheet over limited circumferential areas. 5. The method according to claim 4, characterized in that that with the shearing, the shearing edges of the securing band lying in the shoulder in an axial direction Direction relative to the remaining part of the apron section to form openings are shifted. "-. 6. The method according to claim 4 and 5, characterized in that the connecting web-e are stretched axially during the creation of the separating slits, 7. The method, in particular according to claim ^l \ bis. 6, in which a knurling is produced in the region of the skirt section adjoining the cap base, characterized in that for producing the knurling 2 0 9 8 51/0101 at a large number of places in UKf an es rieh do g £ lci el .C'j n: \ iz distributed from the transition area between the border section and the bottom progressively in the direction of vorr. Bottom away, the skirt material is deformed radially inward in the direction of the cap axis. 8. The method according to claim T » characterized in that, during the axially progressing, radially directed deformation of the skirt section, it is radially supported between deformation areas that are adjacent in the circumferential direction. 9. The method according to claim 7 or 8, characterized in that the knurling simultaneously with the shearing off of the limited shoulder areas by a pressing process running in the direction of the cap axis is produced. , «
10. Compression press for carrying out the method according to claim Ί to 9 with several pressing stations and in these respectively r.usnrx.enaktiv Preßformsteir.peln for forming a flat sheet metal blank into a cap-shaped body with a base; and apron section, characterized by a further pressing station with an inner punch (22) for receiving and supporting the cap-shaped body (12) from the inside, the cylindrical one connected via a shoulder (^ 7) 2 0 9 8 51/0101 Fbad original Sections (25,2ο) having different outer diameters, and one opposite the. Inner.ster..pel relatively cap axis-movable in the direction of the bell-shaped Außenster.pel (23) of the overlapping in its AEEN cap-shaped body, in v; esentliehen inner cylindrical surface in the circumferential direction distributed and cooperating with the shoulder of Innenster.pels shearing edges (34 ) having. CJ 11. Compression press according to claim 10, characterized e i chne t that the outer die (23) -compared to the Inner punch (22) a predetermined distance over the shear position is axially movable addition. 12. Compression press according to claim 11, characterized in that that the shear edges (3Ό with the shoulder (47) of the inner punch for sewing the sheared Sheet edge cooperates. ι ν. j - 13 · Compression press according to claim 10 to 12, thereby characterized in that the inner punch in the circumferential direction spaced narrow support sections (48) in the pressing direction in front of the annular shoulder (47) to the plant an annular shoulder (15) of the cap-shaped sheet metal body (12) and that the shear edge (34) of the outer punch at the peripheral areas corresponding to the support sections (48) (49) is interrupted. 20 98B1 / 0101 BAD ORIGINAL 14. Compression press, in particular according to claim 10 to 13, nut one Device for producing a knurling in the area of the skirt section close to the cap base, characterized by a cap-shaped one Sheet metal body (12) from the inside supporting inner punch, which is in the end face supporting the cap base (17) (27) adjoining circumferential section several in circumferential direction distributed axially extending through radially outwardly projecting Web (38) has separate depressions (40), and by one opposite the inner punch in the axial direction relatively movable, bell-shaped outer die (23) which overlaps the sheet metal body the near seine'Boden (35) several radially projecting from the inner circumferential surface, axially elongated form projections (55) in radial and having axial alignment with the recesses (40). 15. Compression press according to claim 14, d a d u r; c h marked z e i chneti 'that the elongated shaped projections (55) are individually manufactured cylindrical pins, which are interchangeable in axial, the inner surface of the outer punch Holding holes can be used. 16. Compression press according to claim 14 or I5, characterized characterized in that the webs and depressions (38,40) and the shaped projections (55) on the inner and outer punches the press station according to claim "10 to 13 are provided. 2 0 9851/0101 BATH ORIGINAL