EP0111624B1 - Improvements in and to aluminium discs for the manufacture of metal containers by impact extrusion - Google Patents
Improvements in and to aluminium discs for the manufacture of metal containers by impact extrusion Download PDFInfo
- Publication number
- EP0111624B1 EP0111624B1 EP83106088A EP83106088A EP0111624B1 EP 0111624 B1 EP0111624 B1 EP 0111624B1 EP 83106088 A EP83106088 A EP 83106088A EP 83106088 A EP83106088 A EP 83106088A EP 0111624 B1 EP0111624 B1 EP 0111624B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- band
- discs
- rollers
- aluminium
- incision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/02—Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
Definitions
- the manufacturer of such containers has to perform, in order to achieve the finished product, a series of operations, some of which are complex and laborious, if he desires to obtain a perfect and high quality product.
- the first of them is considered to be the most important, since depending on its conditions and characteristics are the remaining operations, as well as the quality of the finished product.
- Said first operation consists in the lubrication of the disc, pastille or ring from which the container is obtained.
- This lubrication should be carried out on both faces of the disc and in many occasions it creates quality problems giving rise to the rejection of a large number of discs or pastilles, which results in a reduction of the productivity and accordingly determines a raise of the price of the product.
- All the types of lubricants utilized are solid, in the form of very fine powder, the operation of lubricating the discs, pastilles or rings being carried out as follows: into rotatable cylindrical or polygonal metal containers, referred to as drums, there are introduced normally 75 kilograms of discs or pastilles, depending in any case on the drum. Thereafter, the solid powdery lubricant is introduced, in a well distributed condition, into the drum, causing the drum to. rotate during 10 or 15 minutes, until a perfect lubrication of the discs on both faces is obtained.
- the discs are subjected, prior to the lubrication step, to a dry tumbling operation.
- the discs are introduced into a drum, similar to the lubrication drum, which is kept rotating for 25 or 30 minutes.
- the discs contained in the drum in a number which may vary between 3,000 and 40,000, are made to rotate within the said drum, thereby producing a rubbing and friction with each other, giving rise to the disappearance of the brilliancy and fineness of the surface, which obtains a rough and wrinkled finish.
- a detachment of fine AI 2 0 3 is produced, which powder has to be evacuated by suction during the process.
- the said defects and abrasions are originated also by other reasons, because the extrusion of a tin with a dirty lubricant or with a lubricant mixed with any kind of powder is as prejudicial as the dry extrusion or the extrusion with an insufficient quantity of lubricant.
- the object of the present invention is to avoid the above disadvantages, thus allowing to obtain discs, pastilles or rings in which, without increasing their diameter, a larger surface of lubrication is obtained, thereby allowing the discs to carry a larger quantity of lubricant.
- the invention allows increasing the lubrication surface of the discs till obtaining a doubling thereof, maintaining, as said previously, the same dimensions of the discs.
- the free surface of the faces of the discs are increased, without increasing the dimensions of this latter, as already pointed out previously, by forming a relief on the said surfaces, obtained by incision or by embossing the plane surfaces of an aluminium band which is successively subjected to a cutting operation for obtaining said discs.
- the incision of the said aluminium band is achieved by passing the said band, after it has been laminated to its final thickness, between two rollers having lateral surfaces engraved with the impressions aimed to be produced on the band.
- the spacing between these rollers will be variable at will, to allow adjusting the pressure exerted onto the band and thus also the depth of the impressions.
- the engraving of the aluminium band may be carried out on the band lamination line, in whose outlet the engraved rollers are mounted.
- the engraving ' operation can be carried out on a cutting line, before whose inlet there are mounted the engraved rollers.
- the said rollers may be provided with two series of ribs perpendicular to one another, the ribs of one of them extending in a longitudinal direction and those of the other series extending in a peripheral direction, the said ribs having an angular cross-section so as to form in the two surfaces of the band and the discs, after they have been cut, an infinite number of aligned quadrangular pyramidal reliefs.
- the invention is especially important in the manufacture of containers from convex or conical discs, the use of which is becoming more and more frequent.
- the concave surface of the disc cannot be completely tumbled by the conventional systems, because it is impossible to obtain rubbing between the discs which have reached the said concave zones.
- this problem is avoided because the discs are engraved on their upper and lower surfaces.
- Figure 1 is a perspective view of a rolling mill, to which an aluminium band 1, coming from the bobbin 2, is supplied for being laminated to the desired thickness.
- the band 1' passes between two rollers 3, whose surface is engraved with the impression which is desired to be provided on the said band.
- the rollers 3 can be spread apart from or approached to one another at will in order to vary the pressure exerted onto the band 1'.
- the band results in being engraved on its two faces with the desired impression.
- the engraved rollers 3 are mounted in a entrainer 5 for the already laminated band 1.
- the pressure of the rollers 3 can be adjusted in order to obtain a band 4 engraved on its two surfaces. This band passes successively through a press 6 for cutting the discs.
- the discs 7 are provided on their two surfaces with a relief 8, Figure 6, defined by two series of crossed channels which define intermediate quadrangular pyramides 9, duly aligned. Accordingly, the engraved rollers are provided on their lateral surfaces with two series of perpendicular channels, those of a series extending along the generatrixes and those of the other series extending in the peripheral direction, which are of angular cross-section.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Extrusion Of Metal (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
- In the manufacture of aluminium containers intended to be used for cosmetics, pharmaceutical products, dentifrices, bottles, and the like, as a raw material there are utilized discs, pastilles or rings made of metal, especially aluminium, and having various diameters and thicknesses.
- The manufacturer of such containers has to perform, in order to achieve the finished product, a series of operations, some of which are complex and laborious, if he desires to obtain a perfect and high quality product.
- Among the successive operations which have to be carried out, the first of them is considered to be the most important, since depending on its conditions and characteristics are the remaining operations, as well as the quality of the finished product.
- Said first operation consists in the lubrication of the disc, pastille or ring from which the container is obtained. This lubrication should be carried out on both faces of the disc and in many occasions it creates quality problems giving rise to the rejection of a large number of discs or pastilles, which results in a reduction of the productivity and accordingly determines a raise of the price of the product.
- Various are the types of lubricants which the manufacturers of this type of containers have tried and used in order to improve the quality and the aspect of the container, especially in case of containers having a large length.
- All the types of lubricants utilized are solid, in the form of very fine powder, the operation of lubricating the discs, pastilles or rings being carried out as follows: into rotatable cylindrical or polygonal metal containers, referred to as drums, there are introduced normally 75 kilograms of discs or pastilles, depending in any case on the drum. Thereafter, the solid powdery lubricant is introduced, in a well distributed condition, into the drum, causing the drum to. rotate during 10 or 15 minutes, until a perfect lubrication of the discs on both faces is obtained.
- To attain the object of a good adherence of the lubricant it is absolutely necessary for the discs to have both faces wrinkled, free from brilliancy and fineness. To obtain this, the discs are subjected, prior to the lubrication step, to a dry tumbling operation. To this end, the discs are introduced into a drum, similar to the lubrication drum, which is kept rotating for 25 or 30 minutes. During this rotation, the discs contained in the drum, in a number which may vary between 3,000 and 40,000, are made to rotate within the said drum, thereby producing a rubbing and friction with each other, giving rise to the disappearance of the brilliancy and fineness of the surface, which obtains a rough and wrinkled finish. During this operation, owing to the rubbing between the discs, a detachment of fine AI203 is produced, which powder has to be evacuated by suction during the process.
- The system described is used at present time by manufacturers in the whole world, but it has some disadvantages, among which the following may be cited:
- As said before, the A1203 detached during the tumbling is evacuated during the process. However, it is really impossible to obtain a 100% elimination of this powder, because, as is well known, the AI203 is a very abrasive product. The residue of powder which remains on the surface of the discs, when these latter are lubricated by the manufacturer of the containers, produces a mixture of powder and lubricant which gives rise to a highly abrasive paste owing to the hardness of the A1203 powder.
- This emery paste formed is deleterious for the following reasons:
- 1. It abrades the dies and the punches of the press.
- 2. It renders it necessary to replace the dies and the punches more frequently for cleaning and burnishing them.
- 3. After having carried out many times the cleaning and burnishing operation the elements are worn to such an extent as to be rejected for having come out from the tolerances.
- 4. The walls of the manufactured tins or containers, are also abraded giving rise to visible defects which causes their rejection after there litography.
- On the other hand, the said defects and abrasions are originated also by other reasons, because the extrusion of a tin with a dirty lubricant or with a lubricant mixed with any kind of powder is as prejudicial as the dry extrusion or the extrusion with an insufficient quantity of lubricant.
- In case of defective or insufficiently lubricated discs, it would be necessary to immediately increase the dose of lubricant. However, the quantity of lubricant permitted for the discs has a limit, because the surface of the discs can be lubricated to such an extent as to cover them completely on both sides, but not more.
- If we increase the quantity of lubricant introduced into the drum, as soon as the surfaces of all the discs have been completely lubricated, any excess of lubricant would remain deposited on the bottom of the drum.
- The object of the present invention is to avoid the above disadvantages, thus allowing to obtain discs, pastilles or rings in which, without increasing their diameter, a larger surface of lubrication is obtained, thereby allowing the discs to carry a larger quantity of lubricant.
- The invention allows increasing the lubrication surface of the discs till obtaining a doubling thereof, maintaining, as said previously, the same dimensions of the discs.
- According to the present invention, the free surface of the faces of the discs are increased, without increasing the dimensions of this latter, as already pointed out previously, by forming a relief on the said surfaces, obtained by incision or by embossing the plane surfaces of an aluminium band which is successively subjected to a cutting operation for obtaining said discs.
- The incision of the said aluminium band is achieved by passing the said band, after it has been laminated to its final thickness, between two rollers having lateral surfaces engraved with the impressions aimed to be produced on the band. The spacing between these rollers will be variable at will, to allow adjusting the pressure exerted onto the band and thus also the depth of the impressions.
- According to a preferred embodiment of the invention, the engraving of the aluminium band may be carried out on the band lamination line, in whose outlet the engraved rollers are mounted. In the same way, according to another preferred embodiment of the invention the engraving' operation can be carried out on a cutting line, before whose inlet there are mounted the engraved rollers.
- The said rollers may be provided with two series of ribs perpendicular to one another, the ribs of one of them extending in a longitudinal direction and those of the other series extending in a peripheral direction, the said ribs having an angular cross-section so as to form in the two surfaces of the band and the discs, after they have been cut, an infinite number of aligned quadrangular pyramidal reliefs.
- The preparation of the discs in the form described hereinabove allows omitting the tumbling operation, it being thus possible to avoid the corresponding plant. On the other hand, the capacity of lubricating the discs is considerably increased, which allows increasing the disc extrusion speed. All these advantages provide a great reduction of the production costs and the achievement of a remarkable improvement in the quality of manufacture of the containers.
- The invention is especially important in the manufacture of containers from convex or conical discs, the use of which is becoming more and more frequent. In this case, the concave surface of the disc cannot be completely tumbled by the conventional systems, because it is impossible to obtain rubbing between the discs which have reached the said concave zones. With the method according to the invention, this problem is avoided because the discs are engraved on their upper and lower surfaces.
- The characteristics described hereinabove will be better understood when reading the following description made with reference to the annexed drawings in which a possible embodiment is shown by way of a non-limiting example.
- In the drawings:
- Figure 1 is diagrammatic perspective view of a rolling mill for cold rolling a band, with the engraving rollers incorporated therein.
- Figure 2 shows a cutting line for the band, into which the engraving rollers have been included.
- Figure 3 is a plan view of a disc obtained according to the invention.
- Figure 4 corresponds, in an enlarged view, to the detail F of Figure 3.
- Figure 5 is a sectional view along the line V-V of Figure 3.
- Figure 6 corresponds, in an enlarge view, to the detail H of Figure 5.
- Figure 1 is a perspective view of a rolling mill, to which an aluminium band 1, coming from the
bobbin 2, is supplied for being laminated to the desired thickness. At the outlet of the rolling mill the band 1' passes between tworollers 3, whose surface is engraved with the impression which is desired to be provided on the said band. Therollers 3 can be spread apart from or approached to one another at will in order to vary the pressure exerted onto the band 1'. At the outlet of therollers 3 the band results in being engraved on its two faces with the desired impression. - In the case of the Figure 2, the engraved
rollers 3 are mounted in aentrainer 5 for the already laminated band 1. As in the previous case, the pressure of therollers 3 can be adjusted in order to obtain a band 4 engraved on its two surfaces. This band passes successively through a press 6 for cutting the discs. - The discs. obtained according to the invention are shown in Figures from 3 to 5.
- As can be seen, the
discs 7 are provided on their two surfaces with arelief 8, Figure 6, defined by two series of crossed channels which define intermediatequadrangular pyramides 9, duly aligned. Accordingly, the engraved rollers are provided on their lateral surfaces with two series of perpendicular channels, those of a series extending along the generatrixes and those of the other series extending in the peripheral direction, which are of angular cross-section. - With this method there is obtained an increase of the lubrication surface of the
discs 7 till it is doubled. - Having sufficiently described the nature of the invention, as well as the manner of its realization in the practice; it is to be pointed out that the arrangements described hereinabove are susceptible of modifications of their details, within the scope of the claims.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES518141A ES518141A0 (en) | 1982-12-13 | 1982-12-13 | MANUFACTURE PROCEDURE OF ALUMINUM DISCS FOR THE FORMATION OF METALLIC CONTAINERS. |
ES518141 | 1982-12-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0111624A1 EP0111624A1 (en) | 1984-06-27 |
EP0111624B1 true EP0111624B1 (en) | 1987-01-14 |
Family
ID=8485057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83106088A Expired EP0111624B1 (en) | 1982-12-13 | 1983-06-22 | Improvements in and to aluminium discs for the manufacture of metal containers by impact extrusion |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0111624B1 (en) |
DE (1) | DE3369081D1 (en) |
EG (1) | EG17259A (en) |
ES (1) | ES518141A0 (en) |
GR (1) | GR81431B (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191018668A (en) * | 1910-08-08 | 1911-04-06 | Victor Chartener | Improvements in Sheet Embossing Mills. |
US1074824A (en) * | 1911-02-06 | 1913-10-07 | Frank L O Wadsworth | Means for densifying metallic surfaces. |
DE1063105B (en) * | 1956-10-09 | 1959-08-13 | Hoesch Westfalenhuette Ag | Roller for rolling steel and non-ferrous metals |
US2969586A (en) * | 1957-04-24 | 1961-01-31 | Victor Mfg & Gasket Co | Method for increasing the effective thickness and resiliency of sheet metal and sheets produced thereby |
DE2349074A1 (en) * | 1973-09-29 | 1975-04-10 | Siegener Ag Geisweid | Profile rollers for progressive forming of V-shaped reinforcing groove - have eccentric profile elements on roller diameter |
DE3008679C2 (en) * | 1980-03-06 | 1983-08-18 | Vereinigte Metallwerke Ranshofen-Berndorf AG, 5282 Braunau am Inn, Oberösterreich | Deep-drawable sheet metal or strip made of non-ferrous metal or an alloy thereof, in particular made of aluminum, as well as a method for its production |
-
1982
- 1982-12-13 ES ES518141A patent/ES518141A0/en active Granted
-
1983
- 1983-06-16 GR GR71708A patent/GR81431B/el unknown
- 1983-06-22 EP EP83106088A patent/EP0111624B1/en not_active Expired
- 1983-06-22 DE DE8383106088T patent/DE3369081D1/en not_active Expired
- 1983-11-13 EG EG711/83A patent/EG17259A/en active
Also Published As
Publication number | Publication date |
---|---|
EP0111624A1 (en) | 1984-06-27 |
DE3369081D1 (en) | 1987-02-19 |
ES8404623A1 (en) | 1984-05-01 |
GR81431B (en) | 1984-12-11 |
EG17259A (en) | 1989-09-30 |
ES518141A0 (en) | 1984-05-01 |
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