DE2116704A1 - Method and device for producing a metal can body with a retracted fastening end - Google Patents

Description

PATENT LAWYERS

" _IA DIPL.-PHYS. DR. J. FRICKE

DR.-ING. R. DOERING

BRAUNSCHWEIG MUNICH

3617

THE METAL BOX COMPAM LIMITED, 37 Baker Street, London, W1A 1AN, England

Method and device for producing a metal tin bowl with a retracted fastening end

The invention relates to a method and a device for producing a metal can body with a retracted fastening end, i.e. a neck portion near the open end of the can body such that a can end of smaller diameter, than it would correspond to the normal size of the can body, can be attached to the end of the can body.

Can ends are normally attached by stitching them to the outward facing pool attaches surrounding the open end of the can body. It is also known, the flange at the end of a neck-shaped or inwardly directed circumferential bead or a corresponding one To attach bead, so that the flange determines the outer boundary soap of the bead, in which one first Neck portion forms and then attaches the flange in a second process stage, one in each process stage a molding tool of a press machine is used. This known method is considered to be essentially satisfactory.

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BATH ORIGINAL

see "when used with cans, which do not have any 'longitudinal seams have or where the longitudinal seams -made by welding are. However, the method is not suitable for can bodies which are closed by soldering or gluing on the side because it is not possible to control the thickness of the overlapped seam within acceptable limits.

It is the object of the invention to provide a. Method and apparatus indicate, with which the formation of a retracted neck at one end of a metal can body with a through soldering or gluing produced side seam is possible at high working speed.

According to the invention, this object is achieved by a method in which a after outwardly curved end flange formed around its open end and subsequently by a rolling process a constriction φ is formed directly behind the flange in such a way that the Flange dips directly into the constricted neck section.

It is known to have an inwardly directed extensive sikke to be formed in a metal can body by a rolling or rotating process, but this bead does not touch one end of the can. Rather, this rolling process has so far only been feasible where the bead is on both sides a cylindrical section of the can body adjoins ·, these cylindrical sections of the same diameter are. In this known method for producing a bead

1Ö9844 / 1118

BATH ORIGINAL

the stresses caused by the rolling process consist mainly of tangential compressive stresses and axial eddy stresses. These tensions give rise to a plastic deformation of the metal, which due to the symmetrical support, which is given by the cylindrical sections and which absorb the said stresses and buckling of the sheet metal can result in a smooth, satisfactory bead. -

When producing a constriction or an inwardly directed circumferential bead at one end of the can body, the However, the bead is only flanked on one side by a cylindrical section of the can body, while the other side remains without support. A rolling process at the end of a cylindrical can body thus leads to an asymmetrical tension pattern, which the occurrence of defects due to bulging, especially in the area of the overlap seam and along the edge of the cylinder, which may form the end flange of the can body.

This problem is raised by the method according to the invention completely overcome so that it becomes possible to have a neck section or an inwardly directed circumferential bead around the open end of a metal can body by rolling, without the mentioned secondary effect occurring, which leads to errors.

1 0 § 8 4 h / 1 1 1 S BAD ORIGINAL

It is a relatively simple matter, a standard can body crimper so that it is suitable for the implementation of the new method, this fact being another, is a major advantage of the invention.

Another advantage of the new process is that it becomes possible, a can body formed with a retracted end in a satisfactory manner and at high speed to be able to manufacture, even if the side seam is soldered or glued, and without bulges or wrinkles occur in lethal. Of course it's new Method also suitable for cutting a drawn-in end section Manufacture can bodies with side seams, which are closed by welding or other methods or in the case of can rips, which have no side seam.

During the curling of the end neck, the diameter of the Flange, while, however, its radial width in the v / ecentlicheir remains constant. The outwardly curved shape of the flange ... allows a smaller can lid to be attached, than would be possible without the constriction.

According to a preferred feature of the invention, the flange formed before the rolling process takes place, so that the whole 3 'flange away from the can body axis outwards and in the longitudinal direction is directed away from the remaining part of the can body, whereby the bulging process results in a further deformation of the radially furthest includes the outside portion of the flange,

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BADORiGl WHALE

so that this finally extends radially. The rolling process preferably comprises the following steps:

a) applying the can body to a mandrel with a constriction, which is limited at one end by an annular surface, which is on the outer end surface of the flange of the can body is applied;

b) Flanging means immediately behind the splash in external contact bring with the can body which flanging means comprise a section engaging the can body with a profile, which essentially corresponds to the required, outer cross-section of the constriction of the can body; as

c) generating a relative rotation and a relative approach movement in a generally radial direction between the Do- (senrumpf and crimping device such that is formed on the can body, the neck portion "

The mandrel is preferably rotated so that it carried by the mandrel with respect to the flanging means rotates.

A can body with a constriction at its end is as a direct product of the method according to the invention covered by the protection of the proceedings.

109844/1118

The invention also provides a training for a device to carry out the new method, which device has the following features:

a) A mandrel for supporting a thin, tubular ketallic can body with a constriction which is limited at one end by an annular surface which is at the outer Abuts the end face of a flange which is formed at the open end of the can body;

b) a flanging device with one acting on the can body Section which has a profile that is essentially corresponds to the required external cross-section of a constriction on the can body; as

c) means for relative rotational movement between the crimping device and to force the thorn.

The flanging means are designed so that a relative Approach movement in a generally radial direction between them Means, and the mandrel becomes possible so that when a can body is mounted on the mandrel there is a constriction between the flanging means and the mandrel rolled onto the can body who -.- ■: can and directly behind the flange, in the way. that the housing dips into the flange.

Because of this high resilience after the manufacture of the bin jia, the final durometer. the constriction is greater ^:

: ^; ^: BADORIGfNAt J-. "

This should be greater than the diameter immediately after, after molding, and before you retract the flanges. The dimensions of the profile of the flanging means are "predetermined" in a corresponding manner.
Preferably the profile is a continuous curve.

Advantageously, the device comprises compliant means
which bias at least that part of the dome which has the annular surface, in the axial direction on the
Constriction of the thorn. This arrangement provides an axial one
Force which prevents the formation of gaps on the outer edge portion of the can body when its diameter is reduced. This omission also allows movement of the annular surface of the mandrel in such a way that
the thickness of the flange in the area of the overlap seam
is compensated.

In cases where both ends of the can body are connected to a
Constriction or an inwardly directed circumferential bead are to be provided according to the invention, the two constrictions or beads can be of the same radial depth, whereby iieut. The depth is preferably chosen such that the outer diameter of each end seam is essentially the same as the outer diameter of the nozzle ring. As an alternative to this, however, one end of the can ring body can also be used to a greater extent than the other end
individually - whereby the difference is preferably chosen so that the finished and closed cans can be stacked
are.

109844/1118 bad original

The invention is explained below with reference to schematic drawings explained in more detail using two examples;

Pig. Figure 1 is a side view of a supporting mandrel and crimping roller of an apparatus for executing of the new procedure.

Pig. 2 shows a partial section on a much larger scale, in the area of the interaction parts between the mandrel and the crimping roller after Pig. 1. " .

Pig. 3 shows, on a reduced scale, a side view of a according to the invention provided with a constriction can body.

Pig. 4 shows, schematically and in a simplified form, a partial section by a modified embodiment of a device for carrying out the method according to the invention. -

Pig. Figure 5 is a cross-section along section line V-V of Figure 5 Pig. 4.. ■

Pig. 6 shows the mandrel on a much larger scale and the crimp rail of a Pig device. 4 and 5 with attached can body.

Pig. 7 is a partial cutout from Pig. 6 in further enlarged! Standards while

109844/1118

'■' BADORiGfNAt

FIG. 8 is a representation similar to FIG. 7, but one Bosenhull reproduces with its longitudinal seam »

From the figures 1 bie J ,, is clear how a provided with a constriction at one end Dosenrunpf (see * Fig. 3) of the invention can be prepared in a Anrollvorriehtung according to the method. This rolling device comprises a support dome 10 and a crimping roller IT, which according to FIG. 1 are both designed so that they form a circumferential, inwardly directed bead 12 or constriction on a cylindrical lethal can body 15 according to FIGS can, which has a lateral longitudinal seam 14 formed by soldering, gluing or welding. The mandrel TO is mounted on a shaft 15 that can be driven in Br device and carries a gear TG which meshes with a second gear 17 which is supported by the crimping roller 11. The latter is arranged freely rotatable about a fixed axis 18 which runs parallel to the axis of the well 10. The axis 18 is mounted on devices not shown in such a way that it can be moved progressively radially inwardly in the direction of the mandrel TO together with the crimping roller 11 when the mandrel and the hollow Tl are rotated, the radially directed movement through the arrow ^: ile A in FIGS. T and 2 is shown: The gears 16 and 17 are arranged in a known manner so that this movement can take place without impairing their engagement.

The new method comprises the following steps ;;

f.

bad original

a) Forming, one: end flange 19, 3er as shown in broken lines at 20 in Pig. 2 is indicated, is curved outwards and is located at one end of the cylindrical Dosenr'uEtpfe's 13, the side seam 14, ι if such is present, in front; the formation of the flange t'9 closed; will j soüie . -; ■

b) the subsequent Anrollen- the inwardly directed bead or a schnür uhg 12 at the end of the 13 üosenrunipfes namely im- EtIfetelbar behind the flange 19 ', -. like Pig. 2 shows, so that the flange 1-9 practically dips into the constriction 12 or forms its outer, axial limit. In other words, the constriction 12 ends in the splash 19. The constriction 12 is outer. a rolling process produced by a; Traveling rotary movement and radial approach fee - ^ wegting In the manner described between the crimping roller 11 outside the can body 13 and the mandrel 10 _r cooperating with it, which is inside the can body

The initial position of the flanged foil 11 opposite the Born is indicated in του explicitly Blriien in Pig * 2, - while its final position after the complete formation of the Inse'nüfeing "i2" is shown by the dotted line ^ i ^f ^ - is frozen "Öie gebizoeiieneii lines 13 'indicate the initial άέ & with a splash provided canfiupfes 13 * You ausgo'loriite EinscihnLiritng 12 is on the other hand reproduced in full äiiö iiiiilefi ii & Mg * 2 * ..-

fii # 4i / liii BAD ORIGINAL

The profile of the aru Dosenrur.pf attacking and interacting with one another Sections 21 and 22 of crimping roller 11 and mandrel 10 iat so each time. elected, each .profile lasts a continuous one Curve forms in such a way that during the rolling of the paddock 19 a reduction both with respect to its outer Durenmes ^ ers D as well as its inner diameter d. Ss is clear from Fig. 2 that the Urn catch from section 19A of the Flange 19 i ^ ach down in the radially directed position thereby is pressed, that initially on this section the annular FlL'ehe 23 attacks the village. There is during the rolling process an axial compressive force between the surface 25 and the corresponding, upper annular surface 24 of the crimping roller 11 on the. Flails? cn 12.-

The Dom 1C iot yielding. biased, for example by iiieliu illustrated spring means, in the direction against the Nozzle body 13 and against the flanging roller 11,

After the roller 11, the constriction 12 completely in the In Fig. 2 has transferred the extended state, it is radially of the. Can body 13 led away so that this axially from the mandrel 1C can be removed. After approval of the. Role 11 occurs a certain amount Spring back on., I.e. the -Ivlmaterial of the constriction 12 and of the flange 19 jump after release to a very limited extent radially outwards. The mandrel 1C has a transition radius 22 between the area ZV-d.es attacking the end of the can body Dornes ur: -i of the surface 26, which on the cylindrical inner " flüci-e 2 ^ des Dosenru:; »pfes attacks. The radius 2Γ is se ^ e-

1 0.9 8 4.4 / 1 1 18

BATH ORIGINAL

selects that the springback "* no bulging of the material" in the lower area 28 of the constriction- 12 "to ^; Consequence when the crimping roller 11 is removed. "■

The diameter of the "surface 26 is smaller than the inner diameter of the neckline G 12 so that the Dosenruiupf 13 slightly "in can be removed from the mandrel 10 in the axial direction. ■ ■ ■ *

™ compartment or at the same time as the method described, a similar constriction 12 can be molded in the same way as other ¹ EnOe of the can body. '

If required, a can lid (not shown) can be attached to your Flange 19 can be attached in a known manner. - ■ -. "" ''

It was found that the directions of rotation of the Dornes and the 'Bürd.elrolle 11 are preferably chosen ^ should that'the longitudinal side seam, where this is present, close ^ runs, i.e. so that the crimping roll over the overlap seam, (i.e., the overlapping portion of the can wall) before it reaches the exposed edge of the seam.

The machine shown in FIGS. 4 and 5 is essentially a conventional can crimping machine which is used in the conventional manner for manufacturing a conventional, inwardly directed bead is suitable at points on the can body where the bead is on both Pages is limited by cylindrical sections of the can body of the same diameter. As can be seen from the figures

109644/1118

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.Proceeds, this machine is further developed so that it can constrict of can bodies according to the method according to the invention suitable is.

The various parts of the machine are shown in Figs shown only schematically. Those parts that are not necessary for the understanding of the execution of the procedure are deemed to have been omitted.

The luaschine shown comprises a main frame 14 in which a. an electric motor 41 is mounted. This is arranged so since he has a horizontal main shaft 42 through a corresponding connection unit 43 with a predetermined speed reduction can drive. The Y / elle 42 runs in main camps 44 of the frame 4C. There are two turntables on the shaft 42 45 attached, at a mutual, axial distance. Each turntable carries a number of shaft housings 46 for the Mandrels which are distributed over the circumference of the turntable 45 at equal intervals. Each housing 46 rests on the same Axis like a corresponding housing 46 of the opposite turntable. Each housing 46 is still on its turntable

with the aid of a fixed cam 47, which is attached to a movement take-off member 48 of the housing engages, movable in the axial direction. The motion take-off member 48 is engaged with the cam held by appropriate means, e.g. a spring 49. Each housing 46 is flanked by two stabilizing rollers 72, each of which is mounted on the turntable 45 with the help of a freely rotatable shaft 73 in the turntable »In Fig. 4 are for

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BATH ORIGINAL

-H clarification some of the roles have been omitted.

In the axial direction there is a 3) face shaft 50 in each housing 46 mounted, the outer end of which carries a pinion 51 on a fixed toothed ring 42 engages. The inner end of each shaft 50 • carries a mandrel 43, on which one end of a thin, tubular MetalidosenruiEpfes 13 can be supported while the the other end of the can body on the similar mandrel of the same

• axial shaft 50 of the other turntable 45 is supported.

Around the mandrels there are two solid wall strips, 54 which are mounted on the frame 4C and with the spikes 53 for constriction of the ends of the can body 13 cooperate, as in the following is described in more detail.

The machine further includes a conventional turntable-type feed device 45 disclosed in Pig. 4 is not shown, it drives the can bodies onto the mandrels 53 from a supply, which is not shown, via a conventional feeder screwing device, which is also not shown, in such a way as is customary in the can manufacturing industry and is not described in more detail here needs to be.

A chute 56 is used to remove the finished can bodies from the machine.

Different, fixed guide plates 57, 58, 59 guide the can bodies from the input end to the. Machine and from machine to Exit.

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2110704

In operation, the I-Iotor 41 rotates the turntables 45 in a direction as indicated by the arrows in Fig. 5, namely:;. with the help of the transmission device 43 and the main shaft 42, so that the mandrels 53 rotate around their own axis, as indicated by the arrows in FIG Pinion 51 and the fixed toothed belt 52, soft in this way provide means for causing relative rotational movement between the crimp rails 54 and the mandrels 53.

The feed table 55 is rotated at the same time and each places a can body 13 according to FIG. 5 between two empty ones Mandrels 53, which are pulled apart by the actuation of the cams 47 woi-den are so that the can body through the stabilizing rollers 72 can be introduced. With further rotation of the turntables 45, the cams 47 cause the mandrels to approach, which engage in the can body and support it. The can bodies are then moved along the crimp rails 54, which form the constrictions to be provided at the ends of the can bodies when the can bodies through the mandrels 53 between the corresponding. Stabilizing rollers 72 are moved, which secure the can bodies in their position on the thorns or set. The can bodies are finally heading towards dropped onto the chute 56 after the mandrels 53 of each pair have been pulled apart by the cams 47.

Before it is introduced into the machine, each can shape has its shape. as shown generally at 13 'in FIGS. The process for making ketal can bodies .w:. ".: ■ 109 8U / 1118

It1 * 704

- "16 -. - ■

with constricted ends according to the invention thus the following Graduated first becomes a thin, shaped ketallic corrugation 13 with an outwardly curved egg lausch 1g on an open fine. , End pass. Then by rolling in the Lasehine with

ι.

The aid of the cooperating ÜürdelBchieiien 54 and "the mandrels 53. a Elnsöhnüruhg. 12 formed immediately behind the Plansch 19 ι so that each flange 19 directly schnürung- in the adjacent inputs. 12 merges * The resulting> with a Eihschnü-. ■ tion 'The can shape provided is the same that can be produced by the method and device according to FIGS. 1 and 2. "

If the j) eye trunk has a longitudinal seam> it is preferably inserted into the Ivlascixine in such a way that the longitudinal seam iii of the previous described in the manner described above, referring to Fig. 5 this." that the overlap the Bordelsehiene 54; touches * be-vor the exposed edge of the lap seam in contact with the Bordelsehiene arrives. ■

The .Flanseh 1.9 is designed ■, the whole flange äak of the body axis and into the longitudinal direction of the rest de-s Ruripfes: Vv'eg directed iet _s as in'gestrichelten lines in Figures 2 "and. 7 is indicated ». _ "". ,

The step for making the constrictions on these dosage hulls ^ in the i,! asohine shown in FIGS. 4 and 5 below with reference to FIGS. 6, 7 and 8 more closely

447 1,118 ^ badorjginal

Pig. 6 shows one of the domes 1> 3, which has a base section 60 with a constriction 61 which is delimited at one end by an annular surface 62 which engages the outer end surface 63 according to FIG Can body is formed. The annular surface 62 is formed on a ring £ 4 which surrounds a cylindrical extension 65 of the mandrel body 60 and sits loosely on this extension so that the ring tilts to a small extent as shown in FIG
can. The ring 64 is also axially movable on the extension 65, but is pretensioned in the axial direction in the direction of the constriction 61, with the help of flexible means,
which in this case consist of a conical spring plate 66 which is supported on a pressure ring 67 which is on the
Mandrel shaft 50 is attached behind the mandrel body 60. The mandrel body itself is on the shaft 50 by means of a screw bolt

68 attached and against relative rotation with respect to the shaft, a cell connection 69 secured.

Each flanged rail 54 has a section 70 engaging the can barrel tip, which section has a continuously curved profile which is approximately the same as the required outer cross section of the
Constriction 12 corresponds to that made on the can body
will be aoll. Each flanging rail int capable of a relative approach movement in a generally radial direction between the
To allow the flanging rail and the mandrel due to the fact that the radius of the section 70 (R in Fig. 5) has a value at which, at the upper end of the rail 54, the section 70 covers the outside of the door body immediately behind the flange.

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BAD ORJGJNAL

stirs, assumes a value at the bottom end of the rail, corresponding to the fully constricted state of the can body jernMß Fig. 7. "

The rolling process comprises the following steps:

a) First, the can body 13 is on two of the mandrels 53 with Assembled with the aid of the feed table 55 and the cams 47.

»■. · ■

b) Thereupon the 3ördelschienen 54 are in external contact with brought the can body 13 by rotating the turntables 45. In the end

c) is due to the rotation of the turntables 45 and due to the decreasing Radius R a relative approach movement in a generally radial direction between the can body 13 and the Crimp rails. 5.4 generated, with the rotation of the mandrels 53,

m which leads to a relative rotation between the can body 13 and the flanged rails 54, the constrictions 12 are formed on the can body.

As can be seen from Figures 6 and 7, the two spikes enter the interior of the vaccine at the beginning of each Molding process. Each annular surface 62 deforms the radially outer section under the influence of the spring 66 71 of the flange at each end of the can body so that the section then extends substantially radially. The axial distance d according to FIG. 7 between the annular surface 62.

1116704

(Wj im. The spring 66 is fully extended to whom the ring 64 sick close to the constriction 61 of the cathedral) and the am Doaenruinpf attacking section 70 of the brothel see 54 is vcraugr.vreioe slightly smaller than the thickness of the flange 19 * In this way, the flange between the .ring 64 and the Rail 54 clamped in place, before the turntables 45 are rotated, the flanged rail 54 moves practically radially inward and thus pulls the flange -ftit inward. - -;

You the cases in which the can body has a side seam j as shown in Fig. 8, the increased thickness of the Overlap area 80 of flange 19 is compensated for by a slight tilting movement of ring 64 on Dornverlärigerüng 65. This tilting movement is. in ed. 8 in exaggerated. LÄaiB-sticks for shown for better clarity »

As can be seen, if the production of a constriction only: is required at one end of the doze body, the second dome 45 can be omitted, with each can body is only taken advantage of by a single thorn ”. Alternatively can the can ruupf also by two spikes in the described ■ A'eic-e supported ^, but v: obei one of the earth rails ! 34 is omitted * ..., .... - ■ _

Claims

1 098 44/1118 ^ P "-" *

BATH ORIGINAL

Claims (8)

- 20 claims / 1..J Method for manufacturing a metal can body with a Constriction at one end, characterized in that that first a thin, tubular metal body with an outwardly curved end flange around the one open end is provided, whereupon by subsequent deformation on the way of a rolling process a constriction immediately behind the Flange is created in such a way that the flange is constricted directly into the Shark section is immersed. 2. The method according to claim 1 _r, characterized in that the flange is formed before the rolling process, 'so that the entire flange extends from the axis of the can body and in the longitudinal direction away from the rest of the can body, that the subsequent rolling process a deformation of the radial comprises the outermost portion of the flange in such a way that this portion then extends substantially / radially. 3. The method according to claim 1 or 2, characterized in that the rolling process -the following steps includes: - ■■ ..- ' .-a) Application of the torso body on a mandrel with a constriction, which is limited at one end by an annular surface which engages the outer face of the neck flange, 109844/1118 BAD ORSGlNAL b) Bringing the can body into external contact immediately behind the flange and flanging devices which comprise a section engaging the can body with a profile, which essentially corresponds to the required outer cross-section of the constriction to be formed on the can body corresponds to, as well c) generating a relative rotation and a relative approach movement in a generally radial direction between the DosenruE-pf and the crimping device, thereby creating the constriction to be made on the can body. 4. The method according to claim 3, characterized in that that the mandrel is rotated so that the can body in relation is rotated on the crimping device. 5. ■ Device for carrying out the method according to claim 1 to 4, characterized by the features ,, that 'a mandrel (53) for supporting a thin, tubular metal can body (13) is provided which has a constriction (61) which at one end by a ¹ annular surface (62) for Abutment on the outer end face (63) of a flange (19) is limited which is formed at the open end of the can body, that crimping devices (54) are provided, which have a section (70) engaging the can body with a profile which is substantially the required outer cross-section of a constriction to be formed on the can body (12) _f - 109844/1118 BATH ORIGINAL corresponds to, as well as a- means (4ΐ up ', 45, -5 ^ _I,;.; 5 45th h witness a relative rotary movement 'between;&er'"BaräeCTeinrichtung and the mandrel - the flanging is so, auag.ebil'det that-it * a relative approximation; ungsb-ewQ.g ^ _n g in a general-radial direction between the B & rdelälii-nrichtu.ng and the mandrel allows - "so that with a can body mounted on the -dorn, a constriction (12) can be rolled between the flanging device and the mandrel ^, directly behind the flange, in such a way that that the constriction dips into the flange. 6. Apparatus according to claim 5, characterized in that the profile of the attacking on the can body '- fenden portion of the flanging device (54) is formed by a continuous curvature. 7. 'gate direction according to claim 5 or 6, g e k e η η ζ e i c hnet by a resilient means (66) for prestressing ™ at least part of the dornea (53). _t which the annular-; ge surface (62), namely in the axial direction in sight of the constriction · (61) of the mandrel. 8. Apparatus according to claim 7, characterized in "g e k en η - ζ e i c h η e t that the-axial distance between the annular surface (62) of the mandrel (53) at full axial extension the resilient front tensioning means ("66) and the one on the can body attacking part (70) of the flanging device "^ (54) slightly is smaller than the thickness of the can body flange (19). 1Ö984 «/ tlT8 BAD ORIGINAL F / S