EP4101558A1 - Method for producing an aerosol dome - Google Patents

Abstract

Method for producing an aerosol dome (1) with a dome area (5) with a rolled edge (2) adjoining the top and arranged at an upper through-opening (32) and with a flange area with inversion (3) adjoining the underside, wherein a paint-coated blank (R ) an intermediate stage (52) is provided in one or more stages, which has the upper through opening (32), followed downwards by a neck section (14), further followed by the dome area (5) on which a circumferential straight flange (15) follows, and this intermediate stage is processed in a processing stage (S9) in which only the inversion (3) is formed

Description

TECHNICAL AREA

The present invention relates to a method for producing an aerosol dome and an aerosol dome produced using such a method.

STATE OF THE ART

Pot-shaped metal objects can be formed from a flat section of sheet metal in a cold forming process. This typically happens after a stamping process or combined with one in a single forming step (deep drawing), in which the finished component is given its final shape. Such processes are used, for example, for the production of pots, spray cans, components in the automotive industry or in the furniture industry, for food packaging, etc. Aluminum and tinplate in particular are used as materials.

Especially when low material thicknesses are used, the forming process must be carried out carefully in order to avoid the formation of cracks, creases, etc. and thus rejects or insufficient quality. This applies above all to the formation of conical wall areas because, in contrast to the formation of axially cylindrical wall areas, guidance in the tool is not guaranteed to the same extent in such cases.

US4914937 proposes a method of forming a tapered container by first drawing the container to a partial length having first and second straight sidewall sections interconnected by a transition section and then drawing material from the transition section to substantially its final length length and its tapered state. The method also optionally includes a second overlength redraw and a bottom profiling step in which the coated portion is used to form the profile.

EP-A-0310726 discloses a method of drawing with a cylindrical punch and frusto-conical die. According to the invention, the blank is subjected to one (or more) drawing operations between a frustoconical die and a cylindrical punch, the pressure of the clamping means being relieved so that the metal, as it deforms, conforms to the shape of the die. Application at Manufacture of can bodies from "double reduced" sheet metal.

EP-A-3702061 describes a method for producing a component from sheet metal with an at least partially curved or linearly conical area from a pot-shaped blank with a substantially cylindrical wall section. The method is characterized in that it comprises at least the following steps: a step train, in which the cylindrical edge section of the blank is formed between a drawing die and a drawing punch guided in a blank holder so as to be displaceable, into a stepped area with two cylinder sections; at least one subsequent cone curve, in which at least the stepped area is formed into a curved or linearly conical component section between two tools.

EP-A-1372880 and EP-A-3691810 describe processes for the production of rolled edges. In the case of EP-A-3691810 is a method for producing a rolled edge from a cylindrical edge section of a pipe, in which a starting area of the edge section is rolled by a positively controlled tool. A flanging tool then moves into the rolled edge area and flangs the rolled edge area into a roll. The method is characterized in that the starting area of the edge section is flanged at an angle in the range of 75-105 degrees from the axial direction into a substantially radially circumferential flange by the tool, which comprises a bending punch and a counterholder.

PRESENTATION OF THE INVENTION

Among other things, the object of the present invention is to provide a method for producing an aerosol dome that makes it possible to produce a dome that is as stable as possible with as little material as possible (low material thickness) without damaging a lacquer layer or polymer layer on the material.

The subject matter of the present invention is accordingly a method according to claim 1 or a use according to claim 14 and an aerosol dome according to claim 15. Specifically, the present invention relates to a method for producing an aerosol dome with a dome area with a rolled edge arranged on an upper passage opening and adjoining the top side and with a flange area bordering on the underside with a fold-over. In this case, an intermediate stage is provided from a lacquer-coated or polymer-coated blank in one or more stages, which has the upper through opening, followed downwards by a preferably substantially cylindrical neck section, further followed by the dome area, which is followed by a circumferential straight flange. This intermediate stage is processed in a processing stage in which only the eversion in one Deep drawing process is formed.

Such a method is preferably further characterized in that the intermediate stage has an outwardly directed collar and/or an outwardly curved corrugation at the transition from the dome area to the neck area.

The processing stage for producing the inversion is preferably followed directly or indirectly by at least one further stage in which a rolled edge is formed from the neck section.

According to a further preferred embodiment, the processing stage for producing the eversion is followed directly or indirectly by at least one further stage in which a preliminary stage or the final edge curl is produced from the remaining flange, this further stage preferably being combined if only one preliminary stage is formed with a stage in which the neck portion is formed into an edge curl, and then preferably this stage is followed by a further stage in which the edge curl is formed. No further steps then preferably follow. The paint-coated blank is preferably presented in the form of a pot with a circumferential flange, a rounded area and a bottom but without a neck area, and in at least a first stage this blank is cut to the required part height H (typically in the range of 10-40 mm) before a rolled edge is produced formed with an axial neck area, and preferably further in this first step the radius at the transition area between the flange and the rounded area is reduced, preferably to a radius in the range of 0.2-1.0 mm, particularly preferably in the range of 0.3-0.6 mm.

After the first stage, the neck area can be shaped further in at least one, preferably in two further stages, a second stage and a third stage, in particular the radius of the area between the axial neck area and the radial base can be reduced, preferably to a sharp edge with a radius in the range of 0.05-0.6 mm, particularly preferably in the range of 0.1-0.2 mm.

According to a further preferred embodiment, in at least a fifth stage, the bottom, which may have been prepared with a scratch, is guided out of the tool as a bowl, forming the upper through-opening, or punched out to form the upper through-opening, and preferably subsequently in a sixth stage the peripheral edge thus formed is folded over to form a collar, with the fifth step and the sixth step also preferably being carried out after the two further steps as set out above.

Furthermore, it is preferred if in one stage, preferably in the fifth stage according to Description above, in the dome area, at the transition from the dome area to the neck area, an outwardly curved wave is formed.

In one stage, preferably in the second stage and/or the third stage and/or the fourth stage, the transition area between the base and the neck area can also be scored in order to prepare for the removal of the base.

A further preferred embodiment is characterized in that to produce the rolled edge from a cylindrical edge section of the neck area, in a first step, preferably in the fifth stage as set out above, an initial zone of the edge section is folded over to form the collar using a positively controlled tool and in a second step step, preferably in the further stage as set out above, a flanging die then moves into the folded edge section and flangs it into a roll, with the first step turning the initial zone of the edge section by an angle in the range of 75- 105°, preferably in the range of 80-100°, or in the range of 85-95°, from the axial direction to a substantially radial circumferential flange.

The bending radius between the circumferential flange and the adjoining axial section is preferably smaller than twice the material thickness of the cylindrical edge section, preferably the bending radius is in the range of 0.5-1.5 times, particularly preferably in the range of 0.75-1.25 times the material thickness of the cylindrical edge section.

The radial length of the flange is also preferably in the range of 2-5 times, preferably in the range of 3-4 times the material thickness of the cylindrical edge section. The material of the blank is preferably provided with a dense layer of lacquer on both sides or at least on the future upper side (outer surface 7). The paint can be applied directly to the metal or via an additional adhesion promoter layer. It is preferably a polyester paint, an acrylate-based system or a methacrylate-based system or a polyurethane paint. Such a paint can be water-based or solvent-based, and it can be cross-linked. The paint is preferably applied without VOC.

The blank can also be provided with a dense polymer layer or plastic layer, or with several such layers. Then there are usually additional adhesion promoter layers in between the metal and the at least one plastic layer. The plastic layer can consist of polyethylene terephthalate (PET) or polypropylene (PP) or polyethylene (PE), or a mixture of such systems. The plastic layer can also contain the usual additives (especially Plasticizers, fillers) and, above all, optionally dyes or pigments in the usual proportions.

The thickness of such a paint layer or plastic layer is typically in the range of 5-40 μm (including any adhesion promoter layer that may be present).

The material thickness of the blank is typically in the range of 0.1-1 mm, preferably in the range of 0.15-0.4 mm, particularly preferably in the range of 0.18-0.34 mm.

The material of the blank is preferably sheet steel, preferably tinplate. However, aluminum is also possible.

The material of the blank (R) is preferably sheet steel
particularly preferably with a yield point, determined according to DIN EN 10002-1:2001, of at least 500 MPa, preferably at least 520 MPa, particularly preferably at least 550 MPa,
and/or with a tensile strength, determined according to DIN EN 10002-1:2001, of at least 500 MPa, preferably at least 550 MPa, particularly preferably at least 575 MPa.

Or the material of the blank (R) is sheet steel, preferably TH520 type tinplate, material number 1.0384; TH550. material number 1.0373; TH580, material number 1.0382; TH620, material number 1.0374, or the corresponding TS types, each according to DIN EN 10202: 2001, and/or DR8, DR8, DR8.5, or DR9, each according to AISI/ASTM 623.

The present invention further relates to the use of such a method for producing an aerosol dome for a spray can.

The present invention also relates to a tool for carrying out such a method.

Last but not least, the present invention relates to an aerosol dome for a spray can produced by a method as set out above or in a tool as set out above.

Further embodiments are specified in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine Stufenfolge zur Herstellung eines Aerosoldoms aus einem topfförmigen Rohling;

Fig. 2

eine erfindungsgemäße Stufenfolge zur Herstellung eines Aerosoldoms aus einem topfförmigen Rohling;

Fig. 3

das Werkzeug der ersten Stufe, wobei in a) das Werkzeug am Anfang des Hubs und in b) das Werkzeug am Ende des Hubs dargestellt ist; und

Fig. 4

das Werkzeug zur Ausbildung der Umstülpung, wobei in a) das Werkzeug am Anfang des Hubs und in b) das Werkzeug am Ende des Hubs dargestellt ist.

Preferred embodiments of the invention are described below with reference to the drawings, which are for explanation only and are not to be interpreted as restrictive. In the drawings show:

1

a sequence of steps for producing an aerosol dome from a pot-shaped blank;

2

a sequence of steps according to the invention for the production of an aerosol dome from a pot-shaped blank;

3

the first stage tool, with a) showing the tool at the beginning of the stroke and b) showing the tool at the end of the stroke; and

4

the tool for forming the inversion, in a) the tool at the beginning of the stroke and in b) the tool at the end of the stroke being shown.

DESCRIPTION OF PREFERRED EMBODIMENTS

In order to produce an aerosol dome from a pot-shaped blank R made of a thin material coated with a paint, several stages are run through according to the known methods.

One possible procedure is related to 1 described.

A pot-shaped blank R produced in a previous stamping and forming process is supplied to the process as shown by arrow 21 . However, it is also possible for the production of this pot-shaped blank R, which is typically first punched out of a raw material supplied in strip form and then deep-drawn into a cup, which can be done in one or two steps, to be carried out as the first step within the scope of the sequence of steps described here .

This blank R, shown in a), has a peripheral flange 15 which transitions from an initially cylindrical area 53 into a rounded area 17 and which has a closed bottom 18 .

In the processing shown by the arrow 22 in the first station S1, this blank R is subjected to a first drawing Z1, with a punch being inserted into the interior of the blank and the blank being pressed against a die. This results in the component shown in b). In this step, the cylindrical area 53 and parts of the rounded area 17 are formed into a dome area 5, and parts of the rounded area 17 and the bottom 18 are formed into a neck section 14, which follows the dome area via a transition 20. The base 18 is reduced in diameter and a curve 19 is set at the transition from the base 18 to the neck portion. The flange 15 essentially remains in place and the component has not yet reached its final height, this will only be adjusted in subsequent steps.

In a step RP represented by the arrow 23, the edge is then cropped, i. H. the radial length of the flange 15 is adjusted to the desired value, this step takes place here within the framework of stations S2 and S3 (one of which is an empty station), this leads to the component according to c).

In the processing shown by the arrow 24 in the fourth station S4, this is Component subjected to a second pulling Z2, which in turn is retracted into the interior with a punch and the component is pressed against a die. This results in the component shown in d). In this step, the dome area 5 is reshaped and increased, and the neck section 14 is lengthened and its radius reduced.

In the processing shown by the arrow 25 in the fifth station S5, this component is subjected to a third drawing Z3, with a punch again being inserted into the interior and the component being pressed against a die. This results in the component shown in e). In this step essentially only the previously round area 19 is formed into a sharp edge 31 at the transition from the neck area 14 to the base 18 .

In the processing shown by the arrow 26 in the sixth station S6, this component is subjected to scoring Ri, i. H. in the area of the transition 31 between the base 18 and the neck area 14, a circumferential score is produced, the function of which is as follows in further processing: the base is prepared in order to be torn away in the next station and pulled out of the tool as a bowl. This results in the component shown in f).

In the decisive processing in the seventh station S7, represented by the arrow 27, this component is subjected to several steps U at the same time. On the one hand, an inversion 3 is produced from parts of the dome area 5 . This inversion goes over a vertical section 9 into the flange 15 and radially inwards over an adjoining area 8 into the dome area 5. The thickening of the material (upsetting) resulting from this type of forming places a great deal of stress on the coating, which can lead to spalling the shift can lead to. On the other hand, with a smaller angle, higher pressures can be withstood when installed in a can. At the same time, a slight outwardly directed wave 13 is formed in the dome area 5 in this step, which adjoins the neck portion 14 . Also at the same time, in this stage, the base that was prepared in station 5 is taken out of the tool as a cup, resulting in a through opening 32 at the top and a free straight edge 16 of the cylindrical section 14, and the component height is adjusted. This results in the component shown in g).

In the processing A shown by the arrow 28 in the eighth station S8, this component is subjected to a tilting A. Ie an initial zone of the edge section 16 is folded over by a tool that is usually inevitably controlled and only then, in the context of the next stage S9, in a second step, a flanging die is moved into the folded edge section and this is flanged into a roll 2 . In this step S8, the initial zone of the edge section 16 is formed by a folding stamp and counter-holder tooling is folded over at an angle in the range 75-105 degrees from the axial direction to a substantially radial circumferential flange 12. This results in the component shown in h).

In the processing W shown by the arrow 29 in the ninth station S9, the rolled edge 2 is formed on the one hand and the radial peripheral edge of the flange 15 is folded over in a preliminary stage 11 on the other hand, so that a horizontal flange section 10 remains. This results in the component shown in i).

Last but not least, in the processing RC represented by the arrow 30, the final edge curl 4 is produced in the eleventh station S11.

In this sequence of steps for manufacturing the aerosol cap, the flange 15 is turned inside out. However, this is now to be deep-drawn using a process that is gentler on the material. In this method of manufacturing the aerosol cap, the outer area of the dome area is turned inside out to form the inversion 3 and the flange is thus prepared for the subsequent station S9. However, this type of forming leads to irregular damage to the paint on the lid.

Particular attention is paid to the forming step of stage S7 after scoring Ri during inversion U, in which the part is lifted apart from the forming of the shaft 13 and the cover and a material shift takes place. The height of the part and the flange diameter required for beading are set here. Since the material has to be free in a certain area of the forming and is not held correctly, there are different tensile, compressive and bending stresses on the sheet metal, which can result in damage to the paintwork.

Damage to the paintwork is avoided by a new forming step and a different sequence of stages. A more material-friendly forming is carried out in the form of drawing. First the height of the part is set (see Drag Z1 and Set Height in S1 in 2 ). After setting the height, the drawing continues, and then later in the tool (S9 in 2 ) to finish pulling the flange 15. There is also the advantage that the contact point of the critical section with the tool is pushed backwards and the part therefore hits the press-in sleeve less frequently. With the new sequence of steps, one station is used more than before.

A method according to the invention is in 2 presented in a sequence of steps.

A pot-shaped blank R produced in a previous stamping and forming process is supplied to the process as shown by arrow 21 . It is also possible that the production of this pot-shaped blank R, which is typically first punched out of a raw material supplied in strip form and then deep-drawn into a cup, which can be done in one or two steps, within the scope of those described here Carry out the sequence of steps as the first step.

This blank R, shown in a), has a peripheral flange 15 which, via a transition 38, transitions from an initially almost cylindrical area 53 to a rounded area 17, and which has a closed bottom 18.

The material of the blank R is sheet steel, namely tinplate, with a yield point (determined according to EN 10202:2001, in particular Chapter 8.2 and the measurement method according to DIN EN 10002-1:2001) of at least 550 MPa. It has a tensile strength (determined according to EN 10202:2001, in particular Chapter 8.2 and the measuring method according to DIN EN 10002-1:2001) of at least 575 MPa. Typically, the material is TH520 (material number 1.0384), TH550 (material number 1.0373), TH580 (material number 1.0382), TH620 (material number 1.0374) tinplate, or the corresponding TS types, each formulated according to DIN EN 10202: 2001 alternatively of type DR8, DR8, DR8.5, or DR9, each according to AISI/ASTM 623. The corresponding compositions and properties of these materials are defined in the standards indicated.

The material is provided with a layer of lacquer on both sides or at least on the future upper side (outer surface 7), a polyester lacquer was used here. The blank can also be provided with a polymer layer or plastic layer, or with several such layers. For example, the commercial system Protact ^® is possible.

In the processing shown by the arrow 22 in the first station S1, this blank R is subjected to a first drawing Z1, with a punch being inserted into the interior of the blank and the blank being pressed against a die (cf. also 3 ). At the same time, the height HE is adjusted in this process. This results in the component shown in b). In this step, the essentially cylindrical area 53 and parts of the rounded area 17 are formed into a dome area 5, as well as parts of the rounded area 17 and the base 18 forming a neck section 14, which follows the dome area via a transition 20. The base 18 is reduced in diameter and a curve 19 is set at the transition from the base 18 to the neck portion. The flange 15 essentially remains and the component is already given its final height here. Furthermore, in this step the transition between the flange 15 and the dome area 5 is formed into a sharp edge 37, typically with a radius in the range of at least 0.35 mm.

In a machining operation in the second station S2, shown by the arrow 33, this component is subjected to a second drawing Z2, with a punch again being inserted into the interior and the component being pressed against a die. out of it results in the component shown in c). In this step, the dome area 5 is further formed and the radius of the neck section 14 is reduced.

In the processing shown by the arrow 34, this component is subjected to a third drawing Z3 in the third station S3, with a punch again being inserted into the interior and the component being pressed against a die. This results in the component shown in d). In this step essentially only the previously round area 19 is formed into a sharp edge 31 at the transition from the neck area 14 to the base 18 .

In the processing shown by the arrow 26 in the fourth station S4, this component is subjected to scoring Ri, i. H. in the area of transition 31 between base 18 and neck 14, a circumferential score is created, the function of which is as follows in further processing: the base is prepared so that it can be torn away at the next station and pulled out of the tool as a bowl. This results in the component shown in e).

In the following processing BA in the fifth station S5, represented by the arrow 25, the base 18, which was prepared in station 4, is guided out of the tool as a cup, punched out and at the same time the shaft 13 is formed in the dome area 5, namely in that area which is adjacent to the neck area 14. This results in the component shown in f).

In the processing KA shown by the arrow 28 in the sixth station S6, this component is subjected to a tilting A. I.e. an initial zone of the edge section 16 is folded over by a tool that is usually automatically controlled and only then in a further stage S10 in a second step is a flanging die inserted into the folded edge section and this is flanged to form a roll 2 . In this step S6 the initial zone of the edge portion 16 is folded over by a tool comprising a folding punch and anvil at an angle in the range of 75-105 degrees from the axial direction to a substantially radial circumferential flange 12 . This results in the component shown in g).

In the processing RB represented by the arrow 35, the edge is then trimmed, i. H. the radial length of the flange 15 is adjusted to the desired value, this step takes place here within the framework of stations S7 and S8 (one of which is an empty station), this leads to the component according to h).

This component is now so far finished in terms of shaping that only the final steps on the flange 15 and on the neck area 14 have to be carried out, and the component can be optimally guided in all steps up to this point. With that, the step of turning inside out becomes all alone in the next stage carried out and with a component in which all forming and stamping have already been carried out, insofar as they can be carried out at all before this step without causing problems in relation to the process management. In particular, at this moment the bottom 18 has already been punched out and the collar 12 has been formed, and the rotating shaft 13 is also already in place, and the final component height, apart from the rolling of the rolled edge 2, has been created.

In the decisive processing in the ninth station S9, represented by the arrow 54, this component is now only subjected to the step FZ. In this case, an inversion 3 is produced from parts of the dome area 5, and it is possible to optimally hold and guide the material. This inversion goes over a vertical section 9 into the flange 15 and radially inwards in the adjoining area 8 into the dome area 5. This leads to the component according to i).

In the processing W shown by the arrow 29 in the tenth station S10, the rolled edge 2 is formed for this component on the one hand and the radial peripheral edge of the flange 15 is folded over on the other hand in a preliminary stage 11 so that a horizontal flange section 10 remains. This results in the component shown in k).

Last but not least, in the processing RC represented by the arrow 30, the final edge curl 4 is produced in the eleventh station S11.

Detached from the effective sequence of steps, steps S1 and S9 are used here for forming the part of the flange. A comparison with the episode after 1 makes the differences in the flange area clear. At the same time, between stations S1-S8, the critical area for internal paintwork damage can be spared because large-area press-in sleeves can be used. The sequence of these steps between the stations S1 and S8 can also be chosen differently than in 2 shown. Large-area push-in sleeves are also used in stations S10 and S11.

3 shows the tool of the first stage S1, where in a) the tool is shown at the beginning of the stroke and in b) the tool is shown at the end of the stroke. As already explained, the component height is set at this stage and the transition area 37 between the flange 15 and the cylindrical or slightly conically converging area 53 is already brought into the final shape. For this purpose, the in Fig. 3 a) inserted blank R between a drawing die 39, which rests on the outer surface 7 of the rounded portion 17, and a blank holder 41, which rests on the inside 6, out. A drawing die 40, which is mounted on the inside of the blank holder 41, now moves into the bottom area 8 and thus forms the neck area 14 (cf Fig. 3 b) ). In parallel, the guide sleeve 43 and the counter-holder 42 move from bottom to bottom Contact surface 55 of the drawing die, the sharp edge 37 being formed at the transition between the contact surface 55 and the rounded area 45 of the drawing die at the transition between the flange 15 and the dome area 5 . The process is also managed in such a way that the required component height H is set. In this first stage, the material in the critical dome area 5 is guided and supported at all times by the inner contact surface 44 of the blank holder 41 and the contact surface 45 of the drawing die 39, so that damage or overloading with resulting porosity of the lacquer layer can be avoided.

In detail, the height is first set in combination with the first drag. As a result, it is possible to drive consistently with larger press-in sleeves 43 and the point of damage on the radius is reduced or no longer exists at all. The part rests on the flange 15 because the indentation sleeve is wider. The blank R is positioned via a hold-down device on the press-in sleeve 43 via the blank holder 41, which is positively fitted to the blank R. Then the material is drawn into the die 39 and the first train begins to form. In the end position, the flange 15 is then placed down to the desired part height. The radius Ra is also formed here, which is typically in the range of at least 0.30 mm.

As a result, the flange 15 is set and the volume of material required for drawing the flange is already in the right place.

In the following stations, the upper area is then pulled further.

4 Figure 12 shows the tool for forming the fold in S9, with a) showing the tool at the start of the stroke and b) showing the tool at the end of the stroke. The output component that is in Fig. 2 h) is shown, is held comprehensively and flatly here between a drawing punch 46 and a receptacle 51 in the dome area 5 . The flange 15 is guided between an upper blank holder 48 and drawing die 49 below. At the lower end of the drawing die there is a shaped piece 47 which serves as a shaping element for the drawing process 3 . A lifting sleeve or impression sleeve 50 is arranged between the bottom drawing die 49 and the receptacle 51 . In this stage S9, the drawing punch 46 and the receptacle 51 move downwards in parallel and thereby clamp the material in the dome area 5. The blank holder 48 clamps the flange 15 on the drawing die 49 (this is rigid) and thus draws the offset (no inversion process , but deep-drawing), with the flange 15 withdrawing somewhat from the gap between the two counter-holders 48/49.

If the flange is prepared for drawing, it is only drawn into the die 49. The part is controlled by the drawing die 46 via the press-in sleeve 50 onto a spring-loaded, form-fitting receptacle 51 . On the flange, a fold holder 48 prevents the Wrinkling during forming.

Now the material on the flange 15 is drawn into the die. This forms the flange height as well as the flange diameter. In addition, the diameter for the lid holder in the body (can body) is drawn out through the die.

The material is always enclosed during the forming process and therefore does not have to yield to unwanted or undefined material flow. This results in a material-friendly forming process, which eliminates the damage to the paintwork that causes it to turn upside down. REFERENCE LIST 1 aerosol dome 25 Processing in station S5 2 rolled edge 26 Processing in station S6 3 everting 27 Processing in station S7 4 edge curl 28 Processing in station S8 5 cathedral area 29 Processing in station S9 6 inner surface of 5 30 Processing in station S11 7 outer surface of 5 31 sharp edge at transition 18 to 14 8th Adjacency area from 5 to 3 32 Through hole at 14 9 vertical section of 3 33 Processing in station S2 10 horizontal flange section 34 Processing in station S3 11 precursor of 4 35 Processing in station S7/S8 12 collar 36 Processing in S10 13 Wave 37 sharp edge 14 neck section 38 Transition between 15 and 17 15 flange 16 free straight edge, edge section 39 drawing die 40 drawing stamp 17 rounded area 41 pleat holder 18 floor 42 counter holder 19 Rounding at 18 to 14 43 Guide sleeve, push-in sleeve 20 Transition from 14 to 5 21 feeding blank 44 inner contact area of 41 22 Processing in station S1 45 contact area of 39 23 Processing in station S2/S3 46 drawing stamp 24 Processing in station S4 47 fitting 48 pleat holder f flange diameter 49 drawing die car pull flange 50 Lifting sleeve or impression sleeve H part height KA tilt collar 51 recording R blank 52 intermediate Ra Radius at 37 53 cylindrical area Rb Radius between 15 and 9 54 Processing in S9 RB crop edge 55 Contact surface of the drawing die RC edge curl Ri cracks A tilting S1 - S11 Stations 1 - 11 B.A Squeeze out slugs and form waves u everting W bulges D Diameter cover mount in body Z1 - Z3 Draw 1 - 3 HE adjust height

Claims (15)

Method for producing an aerosol dome (1) with a dome area (5) with a rolled edge (2) arranged on an upper passage opening (32) adjoining the top side and with a flange area adjoining the underside with an inverted portion (3),
wherein from a lacquer-coated or polymer-coated blank (R) an intermediate step (52) is provided in one or more steps, which has the upper through opening (32), followed downwards by a neck section (14), further followed by the dome area (5), followed by a circumferential straight flange (15),
and wherein this intermediate stage is processed in a processing stage (S9) in which only the fold-over (3) is formed. Method according to Claim 1, characterized in that the intermediate stage (52) has an outwardly directed collar (12) and/or an outwardly curved corrugation (13) at the transition from the dome area (5) to the neck area (14). Method according to one of the preceding claims, characterized in that the processing stage (S9) for producing the inversion (3) is followed directly or indirectly by at least one further stage (S10) in which a rolled edge (2) is formed from the neck section (14). becomes,
and/or that the processing stage (S9) for producing the eversion (3) is followed directly or indirectly by at least one further stage (S10) in which a preliminary stage (11) or the final edge curl (4) is made from the remaining flange (15). is produced, preferably this further stage, if only a preliminary stage (11) is formed, being carried out in combination with a stage in which a rolled edge (2) is formed from the neck portion (14), and this stage then preferably being followed from a further stage (S11) in which the edge curl (4) is formed. Method according to one of the preceding claims, characterized in that the paint-coated blank (R) is presented in the form of a pot with a peripheral flange (15), a rounded area (17) and a base (18) but without a neck area, and in at least a first Stage (S1) this blank is formed to the desired part height (H) before producing a rolled edge (2) with an axial neck area (14), and preferably further in this first stage (S1) the radius at the transition area (38) between the flange (15) and the rounded area (17) is reduced, preferably to a radius in the range of 0.2-1.0 mm, particularly preferably in the range of 0.3-0.6 mm. Method according to claim 4, characterized in that after the first stage (S1) in at least one, preferably in two further stages, a second stage (S2) and a third stage (S3), the neck region (14) is further shaped, in particular the radius of the area (19) between the axial neck area (14) and the radial floor (18) is reduced, preferably to a sharp edge (31) with a radius in the range of 0.2-1.0 mm, more preferably in the range of 0.3 - 0.6mm. Method according to one of the preceding claims 4 or 5, characterized in that in at least a fifth stage (S5) the base (18) is punched out to form the upper through opening (32), and preferably subsequently in a sixth stage (S6) the resulting peripheral edge formed is folded over to form a collar (12), wherein the fifth stage (S5) and the sixth stage (S6) are preferably carried out after the two further stages (S2, S3) according to claim 5. Method according to one of the preceding claims 4-6, characterized in that in one stage, preferably in the fifth stage (S5) according to claim 6, in the dome area (5) at the transition from dome area (5) to neck area (14) an outward curved shaft (13) is formed. Method according to one of the preceding claims, characterized in that in one stage, preferably in the second stage (S2) and/or the third stage (S3) and/or the fourth stage (S4), in the transition region (31) between the floor (18 ) and neck area (14) is scored. Method according to one of the preceding claims, characterized in that for producing the rolled edge (2) from a cylindrical edge section of the neck area (14) in a first step, preferably in the fifth stage (S5) according to claim 6, an initial zone of the edge section by a positively controlled tool is folded to the collar (12) and in a second step, preferably in the further stage (S10) according to claim 2, below Flanging punch (21) moves into the folded edge section (12) and flangs it into a roll (12), whereby in the first step the starting zone (12) of the edge section is rotated by the tool comprising a folding punch and counter holder at an angle in the range of 75-105 °, preferably in the range of 80-100°, or in the range of 85-95°, from the axial direction to a substantially radial circumferential flange (12). Method according to Claim 9, characterized in that the bending radius between the peripheral flange (12) and the axial section adjoining it is smaller than twice the material thickness of the cylindrical edge section, preferably that the bending radius is in the range of 0.5-1.5 times, particularly preferably in the range 0.75-1.25 times the material thickness of the cylindrical edge section,
and/or that the radial length of the flange (12) is in the range of 2-5 times, preferably in the range of 3-4 times the material thickness of the cylindrical edge section. Method according to one of the preceding claims, characterized in that the material thickness of the blank (R) is in the range of 0.1-1 mm, preferably in the range of 0.15-0.4 mm, particularly preferably in the range of 0.18-0.34 mm. Method according to one of the preceding claims, characterized in that the material of the blank (R) is sheet steel, preferably tinplate. Method according to Claim 12, characterized in that the material of the blank (R) is sheet steel
with a yield point, determined according to DIN EN 10002-1:2001, of at least 500 MPa, preferably at least 520 MPa, particularly preferably at least 550 MPa,
and/or with a tensile strength, determined according to DIN EN 10002-1:2001, of at least 500 MPa, preferably at least 550 MPa, particularly preferably at least 575 MPa,
acts
and/or that the material of the blank (R) is sheet steel, preferably tinplate of the type TH520, material number 1.0384; TH550. material number 1.0373; TH580, material number 1.0382; TH620, material number 1.0374, or the corresponding TS types, each according to DIN EN 10202: 2001, and/or DR8, DR8, DR8.5, or DR9, each according to AISI/ASTM 623,
and/or that the paintwork is a paint layer based on polyester paint, polyurethane paint, acrylate paint, methacrylate paint, or a mixture of such systems,
and/or that the polymer coating is a plastic layer based on polybutylene terephthalate, polypropylene, polyethylene, or a mixture of such systems. Use of a method according to one of the preceding claims for the production of an aerosol dome for a spray can. Aerosol dome for a spray can produced by a method according to one of the preceding claims.

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