Classifications

• • 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
  • B21D51/00—Making hollow objects
  • B21D51/02—Making hollow objects characterised by the structure of the objects
  • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects

Definitions

• the present invention relates to a method according to the preamble of Claim 1.
• French Patent Specification 2,3 ⁇ 3.6 describes a method for manufacturing cylindrical receptacles at two locations. At the first location, a sleeve-shaped, and, more particularly, a conical wall part, is formed, provided with a base. These conical semifinished articles are stacked on one another and can be transported in an efficient manner. After all, transportation of cylindrical receptacles having the same dimensions and which cannot be nested in one another in fact essentially amounts to transporting "air", as a result of which the transport costs become especially high.
• the object of the present invention is to overcome these disadvantages. This object is achieved in the case of the method described above by means of the characterizing part of Claim 1.
• fitting the base part after transportation and after transformation to the final size of the sleeve-shaped part it is possible to produce a receptacle with a conventional external appearance. This is especially so in the region near the base.
• the fold or weld seam between the base part and the sleeve-shaped part is not subjected to the deformation stresses, so that unfavourable transportation and storage conditions have no effect on the final product.
• the sleeve-shaped wall part is subjected to a surface treatment before transportation.
• Such lacquer trains could therefore be used for coating blanks for both straight cylinder-shaped receptacles, lids and bases, and blanks for forming the sleeve-shaped wall parts described above.
• welding is used in order to produce a sealed sleeve-shaped form, it is desirable not to provide the free end of the blank with a coating layer if this will impede welding.
• a layer may be provided locally at a later stage.
• Such a coating layer may comprise powder coating.
• the sleeve-shaped wall part is subjected to an anti-rust treatment before transportation.
• an anti-rust treatment is particularly important in the case of receptacles in which the wall part remains at least partially uncoated. This is the case for a major proportion of all receptacles. If the receptacle is totally coated, such an anti-rust treatment is less necessary. In this manner, it is possible to store the sleeve-shaped wall parts without the characteristics of the sleeve-shaped wall part deteriorating immediately.
• the lid can be fitted.
• a lid instead of fitting a lid, it is possible to create a facility with which it is possible, with the aid of, for example, a clamping ring, to incorporate a removable lid.
• the attachment between the base part and the sleeve-shaped wall part may be achieved using any methods which are known in the prior art.
• the sleeve-shaped wall part may have either a conical form or a cylindrical form. If the sleeve-shaped wall part has a cylindrical form, it is preferable to place a number of sleeve-shaped wall parts with different diameters inside one another during transportation. These are subsequently subjected to varying degrees of deformation at the second location in order to arrive at final wall parts which are all essentially of the same size.
• circumferential protuberances may be provided. These may be present either on the inside or on the outside. If a base part is used with the conical wall part, it is necessary to provide the circumferential protuberance near the free end on the outside.
• the initial conical wall part with a smooth wall is deformed outwards in such a manner that an internal circumferential protuberance occurs locally.
• the invention also relates to the semifinished article produced using the method, i.e. the sleeve-shaped wall part.
• Optimum nestability of conical wall parts may already be achieved if the smallest diameter of the conically shaped wall part is less than 20 and, more particularly, less than 10 smaller than the largest diameter.
• the conically shaped wall part is preferably provided, near the part of largest diameter, with an external protuberance. It is also possible to provide an internal protuberance near the part of smallest diameter.
• the invention also relates to a receptacle manufactured from the sleeve-shaped part described above.
• the wall thickness of the receptacle will vary as a result of deformation. Such a variation is relatively small and, preferably, smaller than 5 >
• the invention also relates to an apparatus for deforming a conically shaped wall part into a cylindrical wall part, or a cylindrical wall part into a larger (in terms of diameter) cylindrical wall part.
• This apparatus comprises, according to the invention, a carrier for a wall part, an expansion member and means for moving the expansion member in and out of the wall part. Obviously, after the expansion member in the non-operating state has been moved into the wall part, this expansion member will be moved into a state in which it is moved outwards, so that deformation of the wall part to the desired form is achieved.
• Fig. 1 shows the conically shaped wall part according to the invention in cross section
• Fig. 2 shows several semifinished articles manufactured according to Fig. 1, nested in each other;
• Fig. 3 shows a further embodiment in cross section of the conically shaped wall part
• Fig. ⁇ shows the conically shaped wall parts according to Fig. 3 in the stacked state
• Fig. 5 shows a receptacle manufactured from the conically shaped wall parts according to Fig. 4;
• Fig. 6 shows a number of sleeve-shaped wall parts constructed as cylinders stacked in one another; and
• Fig. 7 shows, diagrammatically, an apparatus for deforming conical wall parts into cylindrical wall parts.
• the semifinished article shown in Fig. 1 is indicated overall by 1. It comprises a conical wall part 2.
• Fig. 1 also shows that the conically shaped wall part is provided with a circumferential rib 6 and has no base.
• Fig. 2 shows various conically shaped wall parts of this type nested in one another. Owing to the presence of the circumferential rib 6, fixing together is prevented because the consecutive semifinished articles rest on one another by means of these circumferential ribs. Fig. 2 clearly shows that, by mutual nesting, it is possible to achieve a considerable reduction in volume during transportation.
• Fig. 3 shows a further embodiment of the conical wall part.
• the conical wall part is indicated overall by 16.
• an inwardly-facing circumferential protuberance 17 is provided, which facilitates stacking, as can be seen, in particular, in Fig. 4.
• Such an embodiment has the advantage that, during subsequent deformation into a cylindrical wall part, circumferential protuberance 17 may disappear during deformation. Consequently, it is no longer possible to see that the cylindrical part has been manufactured from an initial conically shaped wall part.
• Fig. 5 shows the receptacle after the conical wall part has been cylindrically deformed, after which the cylindrical part is provided with a base.
• a receptacle is no different from customary receptacles.
• Fig. 6 shows a number of sleeve-shaped parts constructed as cylinders placed inside one another. These sleeve-shaped parts are indicated by 3. 4, 5» 3 and 18. The mutual distance between these parts is represented as comparatively excessively large, which is shown by broken lines. In practice, the parts will have a mutual spacing of no more than a few millimetres.
• an external diameter of 571-5 mm may be mentioned, whilst the internal diameter is 539 mm.
• the outermost sleeve-shaped part obviously does not need to be deformed any further, whilst the deformation of the innermost sleeve-shaped part is limited.
• the distance between the receptacles is 1.2 mm, for a wall thickness of 1 mm.
• Fig. 7 shows, diagrammatically, by 20, an apparatus for expanding conically shaped wall parts 2.
• This comprises a carrier 21 on which a semifinished article 1 may be placed.
• This carrier 21 can be moved up and down with the aid of a jack 23- In this manner, a conically shaped wall part 1 or cylindrical wall part 4, 5. 13 or 18 can be moved in an expansion mandrel.
• the expansion mandrel After insertion therein, the expansion mandrel will be moved outwards, in a manner which is not shown, as a result of which the cylindrical form is achieved, and, after fitting a base and lid, the receptacle shown in Fig. 5 is achieved.
• the various circumferential ribs can be formed. Before transportation of the semifinished articles 1, these are subjected to an anti-rust treatment. This anti-rust means may subsequently be removed.
• any other expansion member which is known in the prior art may be used instead of an expansion mandrel.
• conical wall parts may be used, approximately 12 of which in a stack give a height of 230 cm.
• cylindrical sleeve-shaped wall parts up to twenty cylinders could be placed within a height of 200 cm. This clearly shows the enormous saving which can be achieved.
• a conical wall part is satisfactory, with a maximum external diameter of ⁇ 5 nun and a smallest diameter of ⁇ 0 mm.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Stackable Containers (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)
• Containers Having Bodies Formed In One Piece (AREA)
• Forging (AREA)
• Mechanical Coupling Of Light Guides (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19861879

Family Applications (1)

Country Status (8)

Families Citing this family (2)

Family Cites Families (5)

• 1993
  • 1993-01-06 NL NL9300023A patent/NL9300023A/nl not_active Application Discontinuation
• 1994
  • 1994-01-05 JP JP6515893A patent/JPH08505324A/ja active Pending
  • 1994-01-05 BR BR9406158A patent/BR9406158A/pt not_active Application Discontinuation
  • 1994-01-05 WO PCT/NL1994/000003 patent/WO1994015734A1/en not_active Application Discontinuation
  • 1994-01-05 CN CN94190880A patent/CN1116413A/zh active Pending
  • 1994-01-05 AU AU58669/94A patent/AU5866994A/en not_active Abandoned
  • 1994-01-05 EP EP94904775A patent/EP0680389A1/en not_active Withdrawn
  • 1994-01-06 ZA ZA9475A patent/ZA9475B/xx unknown

Non-Patent Citations (1)

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