ES2273793T3 - PROCEDURE FOR THE MANUFACTURE OF A METAL SHEET CONTAINER, SUCH CONTAINER AND APPLIANCE TO CARRY OUT THE PROCEDURE. - Google Patents

Abstract

Method for manufacturing a metal sheet container comprising: - the formation of a housing (1) by folding an essentially quadrangular, preferably rectangular piece of metal sheet and joining (16) two essentially parallel side edges of the material sheet, whose sides are therefore, - the narrowing and beading of a part of the base (11) of the housing and - the assembly of a base (9) of a corresponding sheet material, and - the bending of the housing (1) around the base (9), thereby providing an additional annular base surface (13) around the mounted base (9), characterized in that the housing (1) widens, whereby the part ( 17) of the housing immediately above the base part (11) widens essentially more strongly than the base part (11) and because the most strongly enlarged part (17) sits around the base (9) in order to provide the additional annular base surface (13) around the mounted base (9).

Description

Procedure for the manufacture of a sheet metal container, said container and apparatus for carrying out the procedure

The invention relates to a method for the manufacture of a sheet metal container as indicated in the initial part of claim 1. The base is essentially flat.

The union of the two lateral edges of the housing material can be made for example by spot welding and the base can be mounted for example by seam welding.

The invention further relates to a apparatus for carrying out a process for the manufacture of a sheet metal container.

The invention further relates to a sheet metal container as indicated in the initial part of claim 6.

A procedure and a container as it has been mentioned are set out in the document EP-A-0 033 912, which exposes a can of a sprayer with a cylindrical side wall, the base together with its union being pushed into the wall lateral, preferably to be deflected against the wall side.

The present invention is based on a container, for example used for transport and retail sale of paint and the like, that is a sheet metal packaging called technician and with a form like the one represented in the WO 92/04248 in which the base is formed by a procedure corresponding to the one represented in the document EP-A 0 377 985 narrowing and beading one end of the housing and mounting a base, for example by welding by sewing. In this way a container is obtained in which the edge of the base is formed by a flange and the side wall from the flange extends slightly obliquely upwards and out until a fold and then additionally essentially vertically up. The diameter of the area with said fold does not have particularly precise dimensions and therefore in order to store both empty containers and filled and closed containers with a lid, should be provide relatively small dimensions with a large tolerance, which is inconvenient when stacked more containers on top of each other since the battery may cease to be vertical and therefore in unfortunate circumstances is likely to tip over. Said fold can additionally form a weak point in relation to large loads from above, for example, when several containers are stacked one on top of other.

The container described in WO 92/04248 has an edge element mounted on top of the housing This edge element is formed by perforation of a ring from a blank in the form of an iron quadrilateral, forming the ring and welding it by sewing on the Case. A surplus of it will be a circular disk by the perforated of said ring.

WO 99/37420 describes a body of inlaid can in which a hole in the base and a inverted cup is inserted and pasted on the edge of said hole or is welded by sewing on it where the flange is flexes inside the can. That way you get a can for drinks with a cooling function.

The document US-A-5 022 254 describes the widening of a tubular can body by means of a cartridge  of widening divided into segments.

The document DE-A-195 02 992 describes a vessel pressure, for example an aerosol can manufactured by lamination of a piece of sheet metal together with a large overlapping (at least one turn) and welding by sewing a base from the inside, the extreme part of the body of the vessel being narrowed after the base has been inserted into the inside the body and welded by seam with the base, the flange remaining inside the can.

The document EP-A-0 377 985 describes a procedure and an apparatus for narrowing and forming flanges in the end of a blank piece of tubular can.

The document DE-A-34 02 197 describes an apparatus and a process for manufacturing aerosol cans, in which Bottom and top seams are pressed into the can and a "sandwich flange" resulting in that way is folded over the seam.

US-A 3 921 848 describes an aerosol can in which the base in a form of embodiment is formed such that the housing extends to through a curvature and essentially vertically up to a seam where it is attached to the base plate. That way, the housing provides a single narrow base area around the mounted base. The spray can base is designed from same way as described before referring to document DE-A-34 02 197, the basis mounted with the seam being flexed in the container.

The object of the invention is to provide a container, a procedure to make a container of this type and apparatus for carrying out the procedure, so that avoid the inconveniences of the prior art.

This objective is achieved through method of claim 1, the container of the claim 6 and the apparatus of claim 10.

According to the invention, this is obtained by a procedure which is characterized in that the housing is widened so that the housing part immediately by above the base part widens essentially more strongly than the base part and because the most part strongly widened is seated around the base in order to provide additional annular base surface around the mounted base. Therefore, by widening the part of the housing immediately above the part of the base, it is thus possible to calibrate the diameter of the part of the base. In this way, the conicity of a conical container can be reduce in relation to that of the known containers (approach to a cylindrical shape), which is an advantage for the resistance. The resistance of the corner of a container between the base and the side wall is further improved since the joint between the side wall material and the base material the which is usually a flange joint or seam constitutes A weak point By means of the invention, this connection is carried inside the surface of the base of the container where the joint is less exposed to impacts, for example if a container falls by accident and lands on the edge between the base and the wall side.

In an embodiment in which the part upper housing is provided with an edge element formed by an angular piece of sheet material of the same class than that of the base, the mounted base is preferably formed of a piece of sheet material of a diameter equal to or less than the piece that remains from the formation of the edge element. From this way you get an essential material saving since a piece of material, which would be discarded in the prior art, is Use here for the base.

By a first widening of the housing, the base part of the housing is essentially not widened, while the remaining part of the housing widens so a protruding transition is formed between the part of the base and the remaining part of the housing. This facilitates the rear settlement of the housing part above the part of the base.

The housing part immediately above from the base part it preferably widens to about previously determined dimensions in relation to its settlement around the base. Said calibration is therefore obtained at from the diameter of the base part.

In a preferred embodiment of the procedure, a top part of the housing widens essentially less than a central part of the housing during the widening of this centerpiece and therefore the part The upper part widens and the flange forms separately. For the so much is possible to obtain a very strong deformation of the part upper housing, both in view of the assembly of an element of edge as in view of the laminate of the upper part of the housing in order to provide an integrated edge reinforcement.

The objective is additionally achieved by a container which is characterized in that the housing is widens, the side wall being widened essentially more than the base part, so the areas of the ring base have a radial extension and the area of the inner base radially is extends a distance in radial direction away from the Union.

In an embodiment with an element of mounted edge formed by an annular piece of sheet material with an inner and outer diameter, the base preferably mounted It is formed by a piece of material with a diameter that is equal or less than the inside diameter of the annular blank of the edge element. Therefore it is obtained that the base can be formed by the central circular piece from the cut of the edge element.

In a preferred embodiment in which the base is welded by seam on the housing, the housing is extends in the base area from the curvature in the wall inside inwards in the base, up and through an inverse curvature relative to the first curvature to the seam located outside the container between the housing and the base.

Therefore the housing extends preferably essentially horizontally from the first curvature to a second curvature, from there obliquely into the container until said inverse curvature and additionally essentially horizontally until sewing.

According to the invention, an apparatus for carrying The procedure includes means for forming a housing by folding a piece essentially of quadrangular configuration, preferably rectangular, of sheet material and the union of two side edges essentially parallels of the sheet material, whose sides are therefore find, means to narrow and flange a part of the base of the housing and means for mounting the base of a sheet material correspondingly, the apparatus additionally comprising means for the widening of the housing, said means for widening being adapted to widen the part of the housing immediately above the base part essentially stronger than the base part and being adapted to also seat this part around the base in order of providing an additional annular base surface around of the mounted base. Additionally, preferably existing means for widening and beading the upper part of the housing separately.

By means of the invention, it is possible provide a sheet metal container, which due to a very strong extension of its material is relatively light and of that way material is saved without reducing the resistance in relation to with that of the known containers. Especially in the form of preferred embodiment in which the container has an element mounted edge, you get material savings.

Next, the invention will be explained with greater detail by an example of a form that realization referring to the schematic drawing, in which:

Figure 1 shows a tin container metal with a cover,

Figure 2 is a partial sectional view of a container like that shown in figure 1 with a corresponding container placed on top,

Figure 3 is a vertical sectional view of the container of figure 1 before mounting an edge,

Figure 4 is a vertical sectional view of a known container with another edge shape, and

Figures 5 to 11 illustrate the manufacture of the container of figure 1.

The container depicted in figures 1 and 2 It has a body with a side wall 2 formed by a housing 1, wall on which supports 3 are mounted for a handle 4. The container additionally has a cover 5 of a design known for himself and that rests on the edge surrounding the bowl hole Deck 5 normally has an area essentially flat center 5a surrounded by a flat edge area 5b  elevated in relation to the central area. The edge in the form of represented embodiment is constituted by an edge element 6 mounted in the hole of the container (figure 2), element the which, through a flange or seam joint 7, is connected with the upper part 8 of the housing 1. The inner wall in the example of the embodiment has a cross section circular and is slightly conical of a configuration that is known by itself according to the containers for painting and similar, the so-called technical tin packaging. The invention can also be used in relation to containers with a wall cylindrical side and containers with another cross section different from the circular. The container depicted in figure 1 it can have a cubic content of 2-5 l, without However, the invention can be used in relation to containers with a cubic content from 1 to 20 l or even from 0.25 up to 40 l.

As can be seen from figures 2 and 3, the container according to the invention has a base with a shape characteristic. A part of the base is constituted by a base element 9 in which it is attached to the housing 1 by a flange joint or a seam 10 which is known per se same. However, the housing 1 has a part of the base 11 the which from the side wall 2 through a curvature 12 with a small radius of curvature extends radially towards the axis central of the container during the formation of a surface of the annular outer base 13, through an additional curvature 14 up in the container and through yet another curvature 15 to seam 10. The container essentially rests on the surface of the outer base 13 when the container is supported On a flat surface.

As can be seen from Figure 2, by means of this configuration of the base and the dimensioning corresponding to the different areas 5a and 5b of the roof, it get improved control of containers stacked with each other, since the area of the base 23 between the curvature 15 and the seam 10 of a container when they are stacked rests and is guided in position through the cover area 5b of the container underlying.

Figure 4 shows a vertical section a through the top of a container known to itself in which instead of the mounted edge 6, a fold 6a is formed at the top of the housing 1 in order to provide an edge resistant. A container with this edge shape can also be provided with a base designed according to the invention.

A container with a base according to the invention can be manufactured as will be explained in the following
then referring to figures 5-11.

First, a preferably rectangular piece of sheet metal, for example with a thickness of 0.20 to 0.24 mm and of a quality T 56 or T 61 folds to form a tubular housing 1 and the lateral edges that are thus joined together mutually for example by means of spot welding 16 (figure 5). The parts of the housing 1 placed above the part of the base 11 widens radially to form a tube with a widened top 17, a part of the base without widening 11 and a projection or curvature 12 in the transition from the part upper 17 to the base 11 (figure 6).

The part of the base 1 narrows radially and beaded by self-known procedures to forming a part of the narrowed base 11, a flange 19 (figure 7). An element of the base prepared for that purpose 9 is welded by sewing in a known way along with the base part 11 by middle of flange 19 during the formation of a seam 10 (figure 8).

A widening cartridge with segments of thrust pad 20 and preferably a membrane of balanced broadening is guided down into the housing 1 and first flex the area in the projection or curvature 12 at the level of the lower side of the seam 10 (figure 9). It is preferably controlled that the segments 20 are positioned of such shape in relation to spot welding 16 of the housing (1) that is centrally placed in relation to a segment 20 as depicted in Figures 9 and 10. Segments 20 are then radially dispersed as their upper parts become disperse more than its lower parts, the central part 21 of the housing 1 being provided with a conical configuration with determined dimensions (10). The height of the segments 20 is limited so that the upper part 8 of the housing 1 is essentially without widening at this stage. The succession of flexion and the dispersion of segments 20 can be reversed in relation to to the above, or the two movements can be perform more or less at the same time.

The upper part 8 is widened next and flanged separately by means of rollers 22 (Figure 11).

By the method according to the invention, the Housing 1 widens more strongly than normal. In order to prevent that during the widening the area around the spot welding 16, which is generally the weakest zone of the housing 1, said central spot welding placement 16 is made in relation to a segment 20 and the upper part 8 is widens as set by a rotating beading of such so that the tensile stress in the deformation zone is maintains at a relatively low level during widening. If the area around spot welding 16, or the joint if uses another type of joint, it is held, according to the invention nothing can prevent the upper part 8 from widening together with the part center 21 of the housing 1.

After beading the top 8, The blank of the container is prepared for mounting the edge element 6 in a manner known to itself.

Through the invention there are several advantages. First, you save material and therefore weight because housing 1 is relatively and uniformly thin because to strong and uniform widening of material. Because of plastic deformation hardening, this weight saving is gets without reducing the strength of the container. In second instead, it is obtained as raw material for the manufacture of base element 9, a disc material or a circular piece central cut of the raw material from which the edge element 6. This central circular piece is a waste in the prior art and therefore you get a general saving considerable material and weight in the manufacture of a container. Third, you get a container with a more precise diameter at the bottom of the side wall 2, because this diameter is determined by the widening of the segments 20. Accordingly, the container can be manufactured with a finer tolerance and therefore some dimensions of slightly larger diameter in this area, which is an advantage when the containers are stacked as shown in figure 2, because you get a more precise placement of the base of a container inside an edge 23 of the cover 5 of the next bowl The possibility of asymmetric distribution of a stack of various containers is minimized in that way and by consequently the risk of such a battery being minimized is minimized. wobble Said larger diameter dimension additionally assumes that the conicity of the container is less, which is an advantage for resistance

In relation to the containers known in the that the side wall below has a crease so that a seam edge between the side wall and the base does not extend above the diameter of the side wall, a greater resistance because said fold means that at higher load, the container during stacking may yield so that the breaking point at a single site along the circumference sink to the bottom. This stacking can then assume the risk of wobbling. A base designed according to the invention eliminates essentially the risk that the base yields in a single place in relationship with the rest of the circle.

Claims (11)

1. Procedure for the manufacture of a sheet metal container comprising: - the formation of a housing (1) by means of folding an essentially quadrangular piece, preferably rectangular sheet metal and the union (16) of two edges essentially parallel sides of the sheet material, whose sides therefore they meet, - narrowing and beading of one part of the base (11) of the housing and - mounting a base (9) of a material corresponding laminar, and - the flexing of the housing (1) around the base (9), thereby providing a base surface additional ring (13) around the mounted base (9), characterized in that the housing (1) widens, whereby the part (17) of the housing immediately above the base part (11) widens essentially more strongly than the base part (11) and because the more strongly enlarged part (17) sits around the base (9) in order to provide the additional annular base surface (13) around the mounted base (9). 2. A method according to claim 1 wherein the upper part (8) of the housing is provided with an edge element (6) formed by an annular piece of sheet material of the same class as that of the base (9), characterized in that the mounted base (9) is formed by a piece of sheet material of a diameter equal to or smaller than the piece remaining from the formation of the edge element (6). 3. Method according to claim 1 or 2, characterized in that by a first widening of the housing (1), the base part (11) of the housing essentially does not widen, while the remaining part (17) of the housing they widen in such a way that a protruding transition (12) is formed between the base part (11) and the remaining part (17) of the housing (1). Method according to claims 1 to 3, characterized in that the part (21) of the housing immediately above the part of the base (11) widens to previously determined dimensions in relation to its settlement around the base (9 ). Method according to claims 1 to 4, characterized in that an upper part (8) of the housing (1) widens substantially less than a central part (21) of the housing during the widening of this central part (21) and subsequently the upper part (8) widens and beads separately. 6. Sheet metal container comprising a housing (1) of a single layer of sheet material, a joint (16) extending from the top of the container to its base, whose housing (1) forms a side wall (21 ) of the container and comprising an edge at the top of the container and a mounted base (9) of sheet metal, such that a part of the base (11) of the housing (1) in the area of the base of the container from the side wall (2) extends through a curvature (12) and radially towards the center of the base and to the joint (10) between the housing (1) and the mounted base (9), in such a way that a part of the housing (1) forms two annular areas of the base (13, 23) around the mounted base (9), the radially outer (13) being of the two areas of the base located at the lower level of the container and the radially inner one (23) of the two areas of the base being located at a higher level, characterized in that the carcasses a (1) widens, the side wall (21) being enlarged essentially more than the base part (11), the annular areas of the base having a radial extension and the radially inner base area (23) extending a distance in radial direction away from the junction. A container according to claim 6 with an assembled edge element (6) formed by an annular piece of sheet material with an inner and outer diameter, characterized in that the mounted base (9) is formed by a piece of material with a diameter that it is equal to or less than the inside diameter of the annular blank of the edge element (6). A container according to claim 6 or 7, characterized in that the housing (1) in the area of the base from the curvature (12) in the side wall (2) extends inward towards the center of the base, upwards and through an inverse curvature (15) in relation to the first curvature (12) to the seam (10) located outside the container between the housing (1) and the base (9). A container according to claim 8, characterized in that the housing (1) extends essentially horizontally from the first curvature (12) to a second curvature (14), from there obliquely into the container to said inverse curvature (15) and also essentially horizontally until the seam (10). 10. Apparatus for carrying out the procedure according to claim 1, comprising: - means for forming a housing by folding an essentially quadrangular piece, preferably a rectangular piece of sheet material and the joint of two essentially parallel side edges of the material laminate, whose sides are therefore found, - means for narrowing and beading a part of the base of the housing, and - means for mounting a base of a corresponding sheet material, characterized in that it comprises means for broadening the housing, said means (20) for broadening being adapted to widen the housing part immediately above the base part essentially more strongly than the base part and being adapted also to seat this part around the base in order to provide an additional annular base surface around the mounted base. 11. Apparatus according to claim 10, characterized in that it comprises means (22) for widening and flanging the upper part of the housing separately in relation to the remaining part of the housing.