CN1091012C - Sheet-metal closing lid with slightly inclined surface area and mould for producing the same - Google Patents

Abstract

The purpose of the present invention is to ensure the lowering of an opening area as well as the generation of a resistance to an upper compression in closing lids while avoiding buckling-type mechanical deformation of the lowered area during the application of an extended and high-pressure compression from below. To this end, a sheet-metal closing lid for beverage cans comprises from the inside towards the outside a lid surface (10), a peripheral groove (20) and a seamed collar (21). At the level of the lid surface, a flat area (40) is adapted to the shape of a gripping tab (9) and of an opening area (8), and is in a lower position relative to the plane of the lid surface (10). This flat area (40) comprises elongated (42, 43) and short edge areas (45, 46) for defining the same relative to the non-lowered remaining part. One at least of the short edge areas (45) rises slightly ( alpha ) from the plane of the lowered flat area (40) towards the plane of the lid surface (10) located above so as to define a transition area capable of elastic deformation upon the application of an extended compression from the lower side of the lid. This invention also relates to a tool comprising a plurality of individual punches (G, R, H, S) for deforming the lid.

Description

Have mild sinking surf zone the sheet metal capping and make its mould

The technical field that the present invention relates to is the sheet metal capping of beverage can, and its prior art is representative with WO-A95/10373 (Schmalbach-Lubeca).The present invention relates to a zone on the lid, it is not elaborated in the prior art of mentioning in the above, and has just carried in passing.Its title is the flat site of a sinking on the capping, is settling the pulling-on piece that is used to open on it and inwardly swings in opening process and the separated unlatching zone at the line of weakness place at first.These two elements have constituted the opener that helps of a beverage can lid, are placed in according to the present invention in the flat site of sinking, and it also often is known as " recessed plate " in technical term.The flat site that sinks is roughly rectangular shape, have become a long ellipse, in the obvious tendency of a narrow side broadening shape, thereby obtain the relative long side in two positions and the side of two weak points, lid edge cannelure (it has constituted the border of capping to flanging) damping slot (often also be known as " anti-heave muscle " with outside " Ka Bi ", be used to rest on chamber wall) is in other words in other words approached in minor face position wherein.

Problem is, allow to open the sinking in zone, and a high compression strength is provided, make people need not fear the zone that sinks be subjected to from the bottom, more the applanation of High Voltage is done the time spent mechanical tortuous deformation can be taken place.Compression strength should improve.

According to the present invention, this purpose can be accomplished, is not step-like as long as have short fringe region in the flat site that sinks at least, but flexible, has a mild transition (claim 1) of rising from the face of flat site.The Hookean region of this more close damping slot is compared with select the step structure on this position, can stop more muchly permanent deformation takes place when pressure increases.And in the longer edges district of the flat site that sinks, then still adopt step structure (claim 6).

Special character is, if near the inner end of damping slot, produce a mechanical latching district by flow harden, its form is the pressure-sizing district (claim 5) that a cross section is asymmetrical shape, be on the whole circumference, then the elastically deformable performance to the narrow transition position of sinking flat site provides a kind of compensatory, when effect pressure is approximately 6 crust, can also avoid the flat site generation permanent deformation of sinking, and in this zone, strain take place.Not can along vertical mid-plane of lid, length direction pass sinking, particularly oblong flat site bends.

Be different from desired originally, as to improve rigidity and intensity stepped edge zone, even in the short fringe region of sinking flat site, the elasticity transitional region that is limited on width in this zone also has the ability of the higher applanation of opposing.

The mould (claim 10,11) of this lid manufacturing shaping usefulness of emphasis ground explanation, wherein, it is not to be manufactured into steep step-likely in the fringe region of being mentioned, but returns wrong the setting, particularly has inclined plane shape.In all the other zones, in the promptly long fringe region, mould then remains step, can make the sinking that the flat site that sinks in the sheet metal capping can be smooth, thereby form a parallel two-fold curve, have a radius (direction spaced slightly relatively and on circumference is opened) respectively.Preferably, construct mould like this, make it have a kind of distribution on two drift zones of the short fringe region of surface of subsidence on the capping that is shaped, with reference to the corresponding surface of bottom diel, it is with respect to long fringe region retraction.

The two-fold curve is extending longitudinally and isolated abreast two lines, on these lines, rapid bending always takes place on perpendicular to the bearing of trend of line in the lid thin plate, and the bending is here carried out along a radius, at the first sweep place for recessed be protruding at the second sweep place.Between these two sweeps formed join domain with capping on the flat site of all the other parts above still being in and sinking couple together, and settling the opener that helps of lid in the zone that sinks.Brace between these two sweeps or connecting wall roughly stretch between 40 ° to 60 °, and especially about 45 °, and in the longitudinal extension zone, form reinforcing.There are not sweep and significantly bending at the short fringe region place of sunken regions, but face flexible, that raise with the inclined-plane form, the one side is until these two sweeps, and opposite side is to sunken regions, its width be between these two sweeps distance about 30% and 80% between, wherein, distance refers to respectively near (claim 7) than short fringe region place.

Stepped area and flexible chamfered region (8 in long fringe region, claim 9) transition region between stretches on a radius, wherein, the brace of the inclined position between above-mentioned, two sweeps or the broken curve constantly reduces it, it with respect to the angle of inclination of capping by it when initial very high numerical value be varied to always and be roughly zero degree.

An end segments at long fringe region, the angle of inclination of this brace not only changes, and can have extra bending, so that transition enters into the elasticity chamfered region, wherein, preferred imaginary big complete curves, its half cancellation about 90 ° of last distributions, and in remaining second half zone, be changed to smooth chamfered region (claim 9) continuously by steep brace.

A kind of replacement form is to adopt a height continually varying contact pin wall, its angle remain unchanged substantially (claim 9, first kind of selection).

Be used for the mould that lid is shaped, simultaneously also a kind of method has been described to those skilled in the art, utilize its those skilled in the art to carry out deformation process like this to covering, or be shaped like this, make sunken regions, approach in the position at least to obtain a flexible transition portion on one of the fringe region of damping slot, what substitute step adds the solidity transition, the latter then be sunken regions with long corresponding all the other sections of fringe region on have.

Be positioned at the first top drift, be placed in the inboard of a ring gripping drift diametrically, it is near the zone that is arranged in the damping slot, have one that shortened or return wrong end face, when drift is closed, on the final position of bottom, this end face is reserved a bigger slit, between the short fringe region of corresponding surface that is used for carrying out the pressure-sizing or the necessary punch support of ruling and upper punch.Closing position is the operating position, bottom, and longitudinally extending end face is shaped the long fringe region of sunken regions come out like this on this position, promptly forms a step herein.Preferably, at two of first upper punch short fringe region places, end face returns mistake, and it particularly can be constructed to a scrap (bridge), and only rests on the capping contiguously in exterior lateral area.

The footpath makes progress in the outside of lower support drift annular, that have positioning function and holding function, it is the centering drift of an annular, its effect is engaged in the damping slot goes, for with first upper punch, make the both sides of the annular brace drift that capping is mentioned to be fixed in the above.

First upper punch return the wrong short fringe region end face of this drift in other words, the supporting surface that prolongs with respect to the imagination of outer lower portion annular punch or the bottom corresponding surface of first low punch can stretch obliquely with certain angle.This angle is greater than 0, but very little, particularly is between 3 ° to 10 ° (claim 15).If have an inner container cavity on first upper punch, can be used for opener is contained in wherein, then described scrap (bridge) can be provided with the end face of an inclination in the short fringe region near cannelure.Like this when first upper punch is in operating position (bottom subsidence position), the outer end on inclined plane roughly is on the identical height with support and the end face of clamping drift towards the top as second low punch.Wherein, also should consider the sheet metal thickness of lid, thereby this height should be added the thickness of sheet metal.But, be to carry out and correspondingly propose claim here at the situation of not putting into lid about the description of mould.

Self-evident, whole capping is not to be flat fully plane, but slightly outside (making progress) face that arches upward, this point also has corresponding effect to the overall configuration of lid and sinking flat site.

Below the present invention illustrated and replenished by means of several embodiment.

Fig. 1 is the embodiment of a lid, and the step fringe region 41 that it has around complete cycle is used as from the border of the flat site 40 (recessed plate) of capping 10 (panel) sinking,

Fig. 2 is the section along A-A face among Fig. 1, and comprising the distortion mould G, T, the S that are used for being out of shape and tightening clamping, and the application of drift R, H has advantage, but is not imperative,

Fig. 3 is the embodiment of a lid, wherein, and its rubber-like transitional region 45,46 on narrower side on the border of flat site 40,

Fig. 4 a be among Fig. 3 along the section of A-A,

Fig. 4 b be among Fig. 3 along the section of B-B, comprise the distortion mould G, T, S and R, the H that are used for being out of shape and tightening clamping respectively,

Fig. 5 is a cross section in elastic edge zone 45, it be positioned at the pressure-sizing band 30 of a flow harden and the flat site 40 (recessed plate) that sinks between.

The shape of a sheet metal capping as seen from Figure 1, it has the flat site 40 that sinks around the step 41 of complete cycle along one, is oblong.At the fringe region 41a place of the short very strong bending of quilt, the flat site of sinking is very approaching with cannelure 20, and the latter can more clearly see from the section of Fig. 2.Wherein, comprise in the formation of sheet metal capping that one is used for snap-in in 21, one " the anti-muscle of heaving " 20 (being also referred to as central channel or cannelure) and the cappings 10 in the edge of can body.It only is to represent by one section between drift S and R very short interval 10a in the profile of Fig. 2, carries out the transition to the flat site 40 of sinking with that by a precipitous step 41a, helps opener and install there.Helping opener is a upper drawing piece 9, impels by swing and lifts.Be manufactured with unlatching zone 8 by line of weakness and gut threads in sunken regions 40, it extends to another narrower end of oblong flat site 40 always, and this flat site is very approaching with it at the opposite side of cannelure 20.These two trends than long fringe region are a little separately trend, and have tangible spacing distance between the cannelure 20.The outer shape in upper drawing piece 9 and the unlatching zone 8 that partly hidden by it and the flat site of sinking are complementary.

Be the sheet metal capping among Fig. 1 shown in Fig. 3, the fringe region that it is narrower be configured with change.Here, in Fig. 1 for continuous, by a two-fold curve 41 ', 41 " step edge of forming 41 is interrupted; so as chamfered region 45 or 46 all energy is continuous at the place, end, both sides of the plane domain 40 that sinks, can see it more significantly clearly by A-A cross section view Fig. 4 a.B-B section among Fig. 4 b shows the step shape that still is retained, the broken curve 43 of two tight adjacent and runs parallel ', 43 " locate; respectively have bends, reverse radius; distortion mold and punching head G under being positioned at and the arris place of S, in long marginal zone 43 and with it in the relative long marginal zone 42, position.

The flat site 40 that sinks, have on two long edges 43,42 in Fig. 3 two longitudinally extending broken curves 43 ', 43 ", as seeing among Fig. 4 b.This flat site has the zone 45 that rises on the inclined-plane, and the remainder of zone that it will sink and capping 10 flexibly couples together.As seen, this capping is between mould R and the S in Fig. 4 a.Here, very near the place of cannelure 20, avoid various bendings and step take place, so that make this chamfered region do the time spent and can play shape and arch upward being under pressure at narrower fringe region.Showed already that this elasticity in this zone had the more ability of high pressure of resisting.Though be retained on the long fringe region 42,43 of this bending other extension in the flat site 40 that sinks,, still all can be avoided in both sides no matter be in a certain side near near sunken regions 40 both sides the cannelure.

Shown the mould with distortion drift and clamping drift (Haltestempeln) among Fig. 4 a and the 4b, wherein given only is the zone of having carried out change for the conception according to the present invention of general mould with respect to prior art.Remaining mould is general, describes no longer especially at this.

The lid of being put into is on the annular punch S, points to inboard vertical wall on its outer shape and the cannelure 20 and is complementary.From Fig. 4 a and these two profiles of 4b, can see, annular punch in the long fringe region of sunken regions 40 than broad, in order that can carry out the support of entire scope to capping 10.Radial outside at supporting mould S is the annular punch T that a wedge shape is extended downwards, and it affacts in the cannelure 20 with its end face 71a and goes.End face 71a is on the position of sealing,, is in mould down stroke position in other words on the operating position that is, and end face 61a (long side) and 61b (narrow side) with respect to the points upwards of passive ring drift S are on the darker position.In the inner radial of annular punch S, the decline drift of working can be long ellipse as distortion drift G, and its geometry will determine the geometry of the flat site 40 of sinking.This drift shows with two fringe region, and promptly long fringe region 51 and short fringe region 50, their end face respectively do for oneself 50a, 51a are placed on the sheet metal of the capping 10 that will deform.Below last distortion drift G a drift H is arranged, here it does not bear the distortion task, and more significant feature is as relative object, determines the plane of a level with the surface 60 of its correspondence.It can be used as punch support and is used for making line of weakness and is manufactured in capping 10 in the zone 40 that sinks or before it sinks.

Give another annular punch R.Its position is relative with described lower annular drift S, has positioning function, but and nonessential and sheet metal lid contacts and it applied active force it is pressed against on the punch support S, if not only the annular punch T of centering is installed but also the distortion drift G that processes sinker area is arranged in the both sides of punch support S.

Distortion drift G can be applied in power along roughly vertical with the corresponding surface 60 of capping 10 an or mould H axis on direction F, it decides the shape of fringe region of the flat site 40 of sinking with its end face geometry.Hookean region 45,46 among Fig. 3 a can be seen clearly from Fig. 4 a, and they are not to be processed to step-likely, thereby keeps inclined plane shape and extends continuously, and thereby flexibly be between the edge of the bottom surface of the sinking 40 shown in (Fig. 4 b right side) and capping.Different therewith, in Fig. 4 b, show clearly, two tight adjacent broken curves 43 ', 43 " cause the steep bending of sheet metal, have one to connect skin between these two broken curves, it has determined the long marginal zone 42,43 of surface of subsidence 40.Connect skin and in Fig. 3, between visible two broken curves, about 45 ° stretch, and in the zone of stretching to chamfered region 45, this angle changes, up to becoming about 0 °.Here, long fringe region 42,43 bends significantly, and has only about half of around the bending range of 90 ° of stretching, extensions separately, and 45 ° of each half 45a, 45b by inclined-plane 45 in addition are occupied.Stay having had only like this as brace as the section 43a of the crooked end section of each long fringe region 43 or 42 or 42a.Two and half 46a of, the 46b on another inclined-plane 46 similarly.Each short step edge 41a thereby substituted by this upper area 43a, 45a, 45b, 42a among Fig. 1, they are symmetrical with respect to the longitudinal median plane A-A that covers.

The interior accommodation section 52 of upper deformation drift G can be used for holding a pulling-on piece 9; perhaps it can have defencive function; make and before the zone 40 that capping 10 is processed to sink, be manufactured in line of weakness and groove shapes on the capping 10; do not come in contact, thereby only the sheet metal in the fringe region of sunken regions 40 can be touched with other object.

End face 50a as the fringe region 50 that connects sheet, end face not sinking effect here as upper punch G, extend with a very little angle, this angle with respect to the corresponding surface 60 of low punch H is preferably 5 °, can down to 3 °, on to 10 ° scope, change.This angle [alpha] also can see from Fig. 5, provided the transition region 45 of inclined plane shape in the partial sectional view of this and similar lid shown in Figure 3.

Fig. 5 has provided the geometry of inclined plane shape transitional region 45, have one that be attached thereto extraly, around pressure-sizing district 30, it is asymmetric shape on cross section.Flow harden district by 30 acquisitions of pressure-sizing district, form a mechanical enhancer band, material only actually is wherein radially pushed laterally, pushes as passing through a wedge-like annular punch, and is being connected flexible chamfered region 45 to sunken regions 40 directions with this reinforcement band.Amplify in pressure-sizing district 30 to annular in diagram, so that can see clearly.Can see that damping slot 20 is not only dark but also narrow, in order that can reach its effect purpose.

Sheet metal capping described above is mainly used in and is enclosed in its inside and can produces the beverage can of pressing up to 6 or 7 Bagaos.Therefore other purposes is not excluded.

Claims (17)

1, the capping that is used for beverage can of making by sheet metal, from inside to outside has a capping (10),, a damping slot of complete cycle (20) and a snap-in edge (21), in such capping, in capping (10), one with pulling-on piece (9) and one open flat site (40) that the shape in zone (8) is complementary with respect to the plane of capping (10) to recessed heavy, wherein, flat site (40) has long fringe region (42,43) and short fringe region (45,46), they have constituted this flat site with respect to last remaining border of sinker area not of lid (10); And wherein,

(a) one of at least short fringe region (45) gently raises to higher plane, the position of capping (10) from the plane of the flat site (40) that sinks and stretches (α);

It is characterized in that,

(b) this at least one mild fringe region (45) that rises stretches with the angle less than 10 ° with respect to a plane by flat site (40) definition, form one and work as the transition portion that lid is subjected to doing from the applanation of bottom time spent meeting strain, and under the end that is positioned at pulling-on piece (9).

2, sheet metal capping as claimed in claim 1, wherein, two mild ground that raise of short fringe region (45,46) stretch.

3, as the described sheet metal capping of one of above-mentioned claim, wherein, two short more close damping slots of fringe region (20).

4, as the described lid of one of above-mentioned claim, wherein, long fringe region (42,43) is complementary with overlapping to some extent pulling-on piece in part and the edge shape of opening zone (8,9) nearly in respective side.

5, as the described lid of one of above-mentioned claim, wherein, at mild fringe region (45,46) and between the damping slot (20), the blanketed zone (30) that is distributing an asymmetric shape, it can form strong material sclerosis in the transitional region of damping slot (20), thereby, radially inner side end from this groove (20), radially extend internally, at first form a strong degating region (30) that obtains by flow harden, what join with it is a limited elastically deformable on its width, transition portion (45,46) to the flat site (40) that sinks.

6, as the described lid of one of above-mentioned claim, wherein, long fringe region (42,43) be essentially the step-like plane that is stretched over the capping (10) that remains unchanged from the flat site (40) that sinks, particularly by sweep separated by a distance on two circumferencial directions (43 ', 43 "), on them, the lid thin plate is crooked consumingly along relative direction.

7, as the described lid of one of above-mentioned claim, wherein, the mild zone (45,46) that raises be an inclined plane shape, especially its width be between two fringe regions of growing (43,42) respective distance 30% to 80%.

8, as the described lid of one of above-mentioned claim, wherein, long fringe region (43,42) at its approaching short fringe region (45,46) end segments (43a, 42a) locate, stretch along a sweep with a radius, and bending length (circumferential segment) is only about half of, between the capping (10) that is formed in the flat site (40) of sinking and remains unchanged, elasticity is more weak to transition shoulder that fully can not strain, and remaining sweep length (45a 46a) has constituted the short fringe region (45 that covers for half, 46), its mild ground that raises between the remainder of flat site (40) that sinks and capping (10) stretches.

9, as the described lid of one of above-mentioned claim, wherein, in step-like long fringe region end (43a, 42a) in the corresponding edge battery limit (BL) than short fringe region (45,46) of elastically deformable,

Shoulder height reduces continuously, and to disappearing than each step in the minor face edge transitional region (45,46), this maximum height has been determined flat site (40) recessed in lid center roughly from maximum height; Perhaps,

The brace that forms step continuously changes its gradient ground and stretches, and makes from the initial inclination between 50 ° changes to and is roughly 0 ° inclination angle up to 40 °.

10, be used for the being shaped mould of lid of a dark annular groove (20) with a capping (10) and a complete cycle and a fringe region that is connected at radial outside with it (21) is in this mould

(a) in the radial direction, according to its end face (50a, 51a separately; 61a, 61b; 71a) the centering annular punch (T) of settling first upper punch (G), second low punch (S) from inside to outside successively and working from above;

(b) end face (closing position) on the final position of bottom of first upper punch (G) and centering annular punch (T), be in the end face (61a of second low punch (S), 61b) under the position, so that lid location, and with the inner flat site (40) on this capping (10) with respect to the remainder of capping to recessed heavy; But,

(c) end face (50a) of first upper punch (G), near or at least one zones (50) of two fringe regions of more close centering annular punch (T) in, wrong with respect to first upper punch (G) away from returning for all the other end faces (51a) of centering annular punch (T), so that in the cannelure near zone of capping, keep one by the mild transition portion (45 of capping edge to the no bending of smooth sunken regions (40), 46), and in the marginal zone away from cannelure of sunken regions (40), utilize the end face (51a) of first upper punch the step shape (42,43) that is shaped to sunken regions (40).

11, mould as claimed in claim 10, wherein, that lack and long fringe region (50,51) is the end face (50a of first upper punch (G) in other words, 51a) be configured to scrap (bridge) (Stege), and between them, define a container cavity (52) that returns mistake.

12, as claim 10 or 11 described moulds, wherein, the end face (50a) that returns wrong short fringe region (50) stretches with a low-angle (α) greater than zero with respect to corresponding surface (60), particularly roughly initial on the height of second drift (S) end face (61b) of bottom, on the position of closure corresponding to final position under the punch stroke.

13, as claim 10 or 11 described moulds, wherein, two short fringe regions of first upper punch (G), two end faces in other words return mistake.

14, as claim 10 or 11 described moulds, wherein, two of first upper punch (G) end face (50a) slant dilations of short fringe regions (50) are particularly with respect to tilt 3 ° to 10 ° angle of the corresponding surface (60) of first low punch (H).

15, mould as claimed in claim 10, wherein, the second clamping drift (S) around the bottom is provided with a centering ring (T) that applies effect from above, so that affacting on the lid, it goes in cannelure (20) around capping (10), and when first upper punch (G) flattens smooth zone (40) from capping (10) is upward downward, make lid fixing with respect to the bottom second clamping drift (S).

16, as claim 10 or 11 described moulds, wherein, when mould is in the close position, at least one end face (50a) in the fringe region on first upper punch (G), the ring drift of the centering in more close cannelure (20) (T) roughly rests on such equal height position, that is, the end face (61b) of bottom second drift (S) of points upwards also is on this height and position.

17, as claim 10 or 11 described moulds, wherein, first upper punch (G) is essentially oblong, particularly has the narrow side of two open a little long side surfaces and two different lengths.

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