US3690279A - Necked-in can body and method and apparatus for making same - Google Patents

Necked-in can body and method and apparatus for making same Download PDF

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Publication number
US3690279A
US3690279A US77617A US3690279DA US3690279A US 3690279 A US3690279 A US 3690279A US 77617 A US77617 A US 77617A US 3690279D A US3690279D A US 3690279DA US 3690279 A US3690279 A US 3690279A
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US
United States
Prior art keywords
thickness
end portion
bonding material
side seam
necking
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 - Lifetime
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US77617A
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English (en)
Inventor
George W Thompson
John T Hilgenbrink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Can Co Inc
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Continental Can Co Inc
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Filing date
Publication date
Application filed by Continental Can Co Inc filed Critical Continental Can Co Inc
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Publication of US3690279A publication Critical patent/US3690279A/en
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    • 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
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2615—Edge treatment of cans or tins
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing
    • 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
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2615—Edge treatment of cans or tins
    • B21D51/2638—Necking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
    • B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls

Definitions

  • ABSTRACT This disclosure relates to the formation of a can body having at least one necked-in end portion wherein at least the end portion of the can body is of a lapped construction with a deformable bonding material therein. It is customary to neck-in ends of can bodies utilizing a necking die with a floating center post. The clearance in such die construction takes into consideration theextra thickness of the side seam. It is now proposed to make the clearance between the die ring and the center post such that when the necking in occurs, the side seam will be compressed, thereby assuring side seam end portions of a uniform thickness.
  • the die assembly includes an outer die ring and an inner center post.
  • the center post is of a diameter to internally size the necked-in end portion of a can body and the'die ring has an internal sizing surface of a diameter to cooperate with the center post.
  • the center post is mounted so as to float relative to the die ring.
  • the clearance between the center posts and the die ring has been such so as to provide ample space for the end portion of the can body, including the greater thickness side seam portion thereof.
  • the function of the necking die assembly has been solely one of necking-in the end portion of can bodies.
  • the necking die assembly may be constructed merely to maintain a customary deformable bonding material thickness, but assuring that any abnormal thickness will be eliminated by deforming the bonding material. On the other hand, it has been found advantageous to reduce the thickness of the bonding material below that which is customary.
  • Another feature of this invention is that while the invention is readily adaptable tocan body side seams of a lapped construction throughout, it is alsoparticularly adaptable to side seams of the lock and lap type where only the end portions of the side seam are of a lapped construction. In accordance with this invention, it is also proposed to increase the length of the lap portions of such side seams so as to greatly facilitate the necking-in operation and the formation of the necessary double seam.
  • FIG. 1 is a fragmentary sectional view of a customary can body of the type having a lock and lap side seam.
  • FIG. 2 is a transverse sectional view taken through the lap portion of the side seam and shows exaggerated the existence of deformable bonding material therein.
  • FIG. 3 is a sectional view similar to FIG. 2 and shows the lap portion of a side seam wherein there has been an undesired displacement of one of the laps.
  • FIG. 4 is a sectional view similar to FIG. 1 and showing in exaggeration a side seam where there has been a displacement of one of the laps.
  • FIG. 5 is a sectional view similar to FIG. 1 and shows a can body constructed in accordance with this invention.
  • FIG. 6 is a sectional view through a necking die assembly and shows a can body of the type illustrated in FIG. 5 having an end portion thereof necked-in.
  • FIG. 7 is an enlargement of-a portion of FIG. 6 and shows specifically the details of the die assembly and the relationship thereof to a lapped end portion of the can body side seam.
  • FIG. 1 in greatly exaggerated detail a conventional can body construction, the can body being identified by the numeral 10.
  • can body is formed of a single sheet of metal which is rolled into a cylindrical shape and which has the edges thereof joined together in a side seam, generally identified by the numeral 11.
  • the side seam 11 is of thecustomary lock and lap type.
  • central portions of the opposite edges of the blank from which the can body v10 is formed are provided with hooks which are locked together and flattened.
  • the lock portion of the side seam 11, which lock portion is identified by the numeral 12 is of a four sheet thickness.
  • the side seam is of a four sheet thickness throughout the length thereof Accordingly, the side seam is provided at the ends thereof with alap portion identified by the numeral 13.
  • the lap portion 13 is ofa two sheet thickness with the laps thereof being bonded together by a intermediate bonding material 14.
  • This bonding material is normally solder and the solder is also incorporated in the lap portion 12.
  • the bonding material may be in the form of a suitable adhesive or settablecompound. With particular reference to FIG. 2, which is exaggerated, it will be readily apparent that it is diflicult to maintain control over the thickness of the bonding material 14. On the other hand, it is desirable for numerous reasons to maintain the bonded material 14 as thin as possible. This will be discussed further hereinafter.
  • an end unit is to be double seamed to a can body
  • the seaming rolls must be set to take into consideration the thickness of the metal of the can body, including the thickness of the lap portion 13 of the side seam.
  • the necking die assembly it is proposed to utilize the necking die assembly to shape up the lap portion 13 of the can body which is being necked in so as to assure uniformity of side seam thickness in the area of the double seaming.
  • a necking die assembly for necking in the end of a can body 11
  • the necking die assembly being generally identified by the numeral 15.
  • the die assembly 15 is carried by a suitable support 16 which may be the head of a press. It is to be understood that the supports 16 may be mounted for reciprocable movement so as to effect the necessary necking-in operation on the can body 10.
  • the die assembly 15 basically includes a die ring or ring member 17 which is suitably fixedly secured to the underside of the support 16, and a die post or post member 18 which is disposed generally in concentric relation'with respect to the-die ring 17, but which is fioatingly mounted for radial shifting movement relative to both the support 16 and the dieting 17.
  • the post 18 is secured to the support 16 by means of a bolt 20.
  • the die ring 17 has secured thereto in a conventional manner a separate guide ring 21.
  • the guide ring 21 is provided with a primary bore therethrough for effectively guiding an end portion of a cylindrical member, such as the can body 10, into engagement with the die ring 17 and the post 18 and provides support to prevent buckling of the side wall of a can body during a necking-in operation.
  • the guide ring 21 is also provided with a tapered entrance-bore 22 for centering the can body 10 relative to the primary bore thereof.
  • the underside of the support 16 is provided with a central socket-23 which has received therein a circular cross sectional projection 24 formed at the upper end of .the post 18.
  • the diameter of the projection 24. is less than the diameter of the socket 23 so as to permit limited radial floating or shifting of the post 18 relative to the support 16.
  • the differential in diameters of the socket 23 and the projection 24 be substantially equal to the increased wall thickness of the lap portion 13. This permits the shifting of the post 18 relative to the die ring 17 in accordance with the position of the increased wall thickness of the can body, while at the same time assuring the relative central position of the post 18 to facilitate the reception of the post 18 within the end portion of the can body.
  • the bolt 20 includes a shank 25 having a threaded end portion 26 which is threaded into the support 16.
  • the shank 25 isreceived in a central bore 27 formed in the post. 18 with there being sufficient clearance between the bore 27 and the shank 25 to permit the necessary floating movement of the post 18.
  • the bolt 20 also includes an enlarged head 28 which is engaged against the underside of the post 18 and eliminates excessive end float and possible cocking of the post 18;
  • the forming surface of the die assembly 15 is on the die ring 17 with the forming surface being identified by the numeral 29.
  • the extreme end thereof engages the tapered forming surface 29 and compresses the end portion of the can body inwardly and forces the same into the space between the die ring 17 and the post 18 with the material of the can body being sufficiently worked so as to permanently deform the same to form on the can body 10 and end portion 30 of reduced diameter.
  • the post 18 functions as an internal sizing die for the necked-in end portion 30 of the can body and the internal surface of the die ring 17 generally functions as an external sizing die although sufficient clearance is provided to assure against jamming of the necked-in portion 30 between the post 18 and the die ring 17.
  • the die assembly not only for the purpose of necking in an end portion of the can body, but also for the purpose of sizing or making uniform that portion of the side seam 11 which is incorporated in the necked-in end portion 30.
  • This is accomplished by maintaining a critical relationship between the diameter of the posts 18 and the die ring 17. If it is desired merely to assure uniformity in the thickness of the side seam, the internal diameter of the die ring 17 will be equal to the external diameter of the post 18 plus three times the can body wall thickness plus the normal thickness of the bonding material 14.
  • a method forming a can body having a necked-in end, said necked-in end having a bonded lapped seam of a predetermined uniform thickness comprising the steps of forming a can body having a side seam of which at least one end portion is of a lapped construction with a deformable bonding material therein, and engaging said one end portion and simultaneously reducing the diameter of said one end portion and radially compressing said end portion side seam to said predetermined uniform thickness by deforming the bonding material while the wall thickness of the remainder of said can body end portion remains substantially undiminished.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
US77617A 1970-10-02 1970-10-02 Necked-in can body and method and apparatus for making same Expired - Lifetime US3690279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7761770A 1970-10-02 1970-10-02

Publications (1)

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US3690279A true US3690279A (en) 1972-09-12

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US77617A Expired - Lifetime US3690279A (en) 1970-10-02 1970-10-02 Necked-in can body and method and apparatus for making same

Country Status (5)

Country Link
US (1) US3690279A (fr)
JP (1) JPS5316354B1 (fr)
CA (1) CA1028260A (fr)
FR (1) FR2110173B1 (fr)
ZA (1) ZA708676B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845653A (en) * 1971-03-22 1974-11-05 Continental Can Co Double stage necking
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US5945230A (en) * 1997-03-28 1999-08-31 Rayovac Corporation Toed-in anode can and electrochemical cell made therewith

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1603973A (en) * 1978-02-16 1981-12-02 American Can Uk Ltd Drums
EP0029741A3 (fr) * 1979-11-26 1982-11-03 Grove Valve And Regulator Company Procédé de formage d'un partie de corps de vanne avec pièce d'embout intégrale et fabrication d'un corps de vanne en utilisant cettes parties

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327437A (en) * 1941-08-04 1943-08-24 Continental Can Co Method of manufacturing sheet metal cans
US2755839A (en) * 1952-07-05 1956-07-24 Ainsworth Mfg Corp Apparatus for re-forming tubular members
US3468153A (en) * 1967-11-20 1969-09-23 Nat Can Corp Die set unit and method for can manufacture
US3600927A (en) * 1968-12-30 1971-08-24 Continental Can Co Necking die with floating center post

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327437A (en) * 1941-08-04 1943-08-24 Continental Can Co Method of manufacturing sheet metal cans
US2755839A (en) * 1952-07-05 1956-07-24 Ainsworth Mfg Corp Apparatus for re-forming tubular members
US3468153A (en) * 1967-11-20 1969-09-23 Nat Can Corp Die set unit and method for can manufacture
US3600927A (en) * 1968-12-30 1971-08-24 Continental Can Co Necking die with floating center post

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845653A (en) * 1971-03-22 1974-11-05 Continental Can Co Double stage necking
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US5945230A (en) * 1997-03-28 1999-08-31 Rayovac Corporation Toed-in anode can and electrochemical cell made therewith

Also Published As

Publication number Publication date
FR2110173A1 (fr) 1972-06-02
JPS5316354B1 (fr) 1978-05-31
CA1028260A (fr) 1978-03-21
FR2110173B1 (fr) 1975-02-07
ZA708676B (en) 1972-08-30

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