US3820486A - Renecking method - Google Patents

Renecking method Download PDF

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Publication number
US3820486A
US3820486A US00242107A US24210772A US3820486A US 3820486 A US3820486 A US 3820486A US 00242107 A US00242107 A US 00242107A US 24210772 A US24210772 A US 24210772A US 3820486 A US3820486 A US 3820486A
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US
United States
Prior art keywords
renecking
open end
necking
neck
foreshortened
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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US00242107A
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English (en)
Inventor
J 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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Can Co Inc filed Critical Continental Can Co Inc
Priority to US00242107A priority Critical patent/US3820486A/en
Priority to ZA725008A priority patent/ZA725008B/xx
Priority to CA163,660A priority patent/CA993730A/en
Priority to JP3996073A priority patent/JPS5339019B2/ja
Application granted granted Critical
Publication of US3820486A publication Critical patent/US3820486A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D51/2638—Necking
    • 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

Definitions

  • ABSTRACT This disclosure relates to a method of improving axial static load resistance of tubular metallic bodies, specifically can bodies, by first necking-in a normally cylindrical open end (or ends) of the metallic body to form a neck shoulder forming the transition area between the body proper and its neck, and thereafter renecking the body open end to reduce the angle of the neck shoulder to between 13-l8.
  • different degrees of axial load resistance improvement were obtained ranging from 25 percent to 53 percent.
  • renecking penetration is 0.020 inch axially greater than the initial necking penetration thus achieving the advantage of increased body height after renecking approximately 0.010 inch.
  • This invention relates in general to new and useful improvements in the manufacture of can bodies,.and more particularly relates to a method of first necking-in an end of a can body and thereafter renecking or reforming, preferably by a female die having a floating punch center, so as the end of the can body is conformed for the reception of a small diameter end or cover and achieved thereby is not only a gain in axial length as compared to a necked container, but an increase in axial load strength is obtained ranging from 25 to 53 percent.
  • cans which are simply necked are not exceptionally resistive to axial loading, and until the present invention exhaustive trials achieved only a percent increase in axial load although this was undesirably obtained by increased pleating in the shoulder areas of soldered, aluminum, and other type cans whereas increased wrinkling occurred in the radius notches of welded cans.
  • the novel method of this invention which includes providing a tubular metallic body having at least one open end, necking the body open end to form a neck shoulder forming the transition area between the body proper and its neck, and renecking the body open end to reduce the angle of the neck shoulder to between l3-l8.
  • a further object of this invention is to provide a novel method of the type heretofore set forth wherein the metallic body prior to the necking operation has a predetermined axial length which is foreshortened as a result of the necking operation, and the renecking step increases the axial length of the foreshortened neck body.
  • the renecking or reforming spans an axial distance approximately 0.020 inch greater than the initial necking step, and preferably both necking and renecking operations are performed in female dies having floating punch centers in internal telescopic relationship to the metallic body end or ends being necked and renecked.
  • FIG. 1 is a schematic sectional view of a normally right cylindrical can body, and illustrates axially opposite ends being necked-in between external female dies and internal floating punch centers.
  • FIG. 2 is an enlarged fragmentary sectional view of the encircled portion of FIG. 1, and illustrates the formation of a neck shoulder forming the transition area between the body proper and its neck, with the initial neck shoulder angle being approximately
  • FIG. 3 is a view similar to FIG. 1 but illustrates the initial necked can body of FIGS. 1 and 2 being renecked or reformed, and more particularly illustrates a reduction in the neck shoulder angle.
  • FIG. 4 is an enlarged fragmentary sectional view of the encircled portion of FIG. 3, and more clearly illustrates the reduction in the neck shoulder angle of between l3l8.
  • a typical can body is generally designated by the reference numeral 10, and prior to being necked-in initially as shown in FIGS-l and 2, the can body 10 is of a right cylindrical configuration of constant circumference and diameter from end to end.
  • the can body may initially be any one of the type described in reference to FIG. 1 of applicants corresponding application Ser. No. 100,264 entitled Method of Forming Necked-In Can Bodies, filed Dec. 21, 1970, now US. Pat. No. 3,763,807, and assigned to the assignee of the present application.
  • FIGS. 1 and 2 wherein there are illustrated a pair of opposed conventional necking dies, generally designated by the reference numerals ll, 12.
  • Each necking die ll, 12 includes a female necking die 13, a lead in ring 14, and a floating punch center 15.
  • An outer'periphery 16 of the punch center 15 is spaced from a peripheral wall 17 of the die 13 and defines therewith a gap 18 which receives an associated end E of the container body 10 during a necking operation.
  • the radial distances between the surfaces 16, 17 and thus the radial width of the gap 18 may vary to accommodate tolerances between different can bodies.-
  • the diameter of the punch center which is that of the surface 16 is 2.460 inch minus 0.0002 inch whereas that of the surface 17 is 2.4832 inch plus 0.0004 inch for a can body whose diameter prior to necking-in is 2.594 inch plus 0.002 inch.
  • the gap 18 can vary between 0.0066 inch minimum and 0.0166 maximum due to the float of the center punch 15.
  • Each female die 13 includes a neck shoulder forming surface 20 defining an angle A of 30 plus or minus two degrees.
  • each end E of the container body 10 as necked-in are identical in that each end E includes neck shoulders NS forming the transition area between the main body portion MBP and the adjacent neck N.
  • the now necked-in can body is transferred to the apparatus of FIGS. 3 and 4 which reforms or renecks the necked-in container 10 of FIGS. 1 and 2 and has accordingly been provided with like though primed reference numerals.
  • the neck shoulder forming surface 20' includes an angle A whose angle ranges between 13l8 which in turn transforms the initial neck shoulder NS of the necked-in container 10 to a neck shoulder NS likewise defining an angle of between 13l8.
  • the points c'd' of the female renecking dies 13', 13' is actually greater by approximately 0.020 inch which in effect transforms a like axial dimension (0.02 inch) of the main body portion inboard of points a and b to a portion of the renecked neck surface NS. That is, the ends E of the neck container 10 when renecked, as shown in FIGS. 3 and 4, penetrate past the original neck at each end of FIGS. -1 and 2 up to 0.020 inch.
  • the advantage thereof is an increase in can body height oraxial length from end to end (EE) which amounts to an approximate increaseof 0.010 inch added to the standard necked in can height of FIGS.
  • the standard 12 ounce can body cylinder has an original axial length of 4.937 inch plus-or minus 0.002 inch.
  • Renecking in accordance with FIGS. 3 and 4 after initial necking in accordance with FIGS. 1 and 2 effects a recovery of 0.010 inch plus or minus 0.002 inch of the metal length lost in the necking operation (FIGS. 1 and 2).
  • the final renecking axial length would then be 4.932 inch plus or minus 0.002 inch.
  • the range here represents the original range incurred in slitting the metal sheet to blank size.
  • the recovery of 0.010 inch axial length in the renecking operation (FIGS. 3 and 4) is an advantage since it is obviously desirable to be as close as possible to the standard height that is established for straight sided (nonnecked) 12 ounce cans as delivered to the customer.
  • Control-W a welded standard necked can
  • Control-S a soldered standard necked (30) side seam can
  • the control cans were necked but not renecked whereas each of the six sample cans were necked and renecked at respectively 18, 15, and 13.
  • Table I The results of Table I were accumulated by laboratory testing which simulated the type of axial failure that occurred when standard necked soldered and/or welded cans failed in transit during route truck delivery of filled goods.
  • a 560 gram weight was dropped from a height of 10 inches (0.254 millimeters) onto the double seam of a filled can.
  • the can is first placed in a test fixture so that the weight contacts the double seam on one side only. Repeated drops are made until metal failure in the neck shoulder area occurs and leakage of the product is evident.
  • a method-of improving axial load resistance of tubular metallic bodies comprising the steps of providing a tubular metallic body having at least one open end, necking the body open end to form a neck shoulder forming the transition area between the body proper and its neck, and renecking the body open end to reduce the angle of the neck shoulder to between 1318.
  • a method of improving axial load resistance of tubular metallic bodies comprising the steps of providing a tubular metallic body having at least one open end, necking the body open end to form a neck shoulder forming the transition area between the body proper and its neck, renecking the body open end axially a distance beyond the neck shoulder whereby a portion of the body proper after renecking becomes a portion of the renecked shoulder, and the renecking step reduces the angle of the neck shoulder to between l3-l 8.
  • a method of improving axial load resistance of tubular metallic bodies comprising the stepsof providing a tubular metallic body having at least one open end, necking the body open end to form a neck shoulder forming the transition area between the body proper and its neck, renecking the body open end axially a dis-- tance beyond the neck shoulder whereby a portion of the body proper after renecking becomes a portion of the renecked shoulder, said metallic body prior to said necking operation ahs a predetermined axial length which is foreshortened as a result of said necking operation, and said renecking step increases the axial length of the foreshortened necked body.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
US00242107A 1972-04-07 1972-04-07 Renecking method Expired - Lifetime US3820486A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00242107A US3820486A (en) 1972-04-07 1972-04-07 Renecking method
ZA725008A ZA725008B (en) 1972-04-07 1972-07-20 Renecking method
CA163,660A CA993730A (en) 1972-04-07 1973-02-13 Renecking method
JP3996073A JPS5339019B2 (enrdf_load_stackoverflow) 1972-04-07 1973-04-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00242107A US3820486A (en) 1972-04-07 1972-04-07 Renecking method

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US3820486A true US3820486A (en) 1974-06-28

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US00242107A Expired - Lifetime US3820486A (en) 1972-04-07 1972-04-07 Renecking method

Country Status (4)

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US (1) US3820486A (enrdf_load_stackoverflow)
JP (1) JPS5339019B2 (enrdf_load_stackoverflow)
CA (1) CA993730A (enrdf_load_stackoverflow)
ZA (1) ZA725008B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995572A (en) * 1974-07-22 1976-12-07 National Steel Corporation Forming small diameter opening for aerosol, screw cap, or crown cap by multistage necking-in of drawn or drawn and ironed container body
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US20100107719A1 (en) * 2008-10-31 2010-05-06 Jeffrey Edward Geho Necking die with shortened land and method of die necking
US20100107718A1 (en) * 2008-10-31 2010-05-06 Karam Singh Kang Necking die with redraw surface and method of die necking
US10934104B2 (en) 2018-05-11 2021-03-02 Stolle Machinery Company, Llc Infeed assembly quick change features
US11097333B2 (en) 2018-05-11 2021-08-24 Stolle Machinery Company, Llc Process shaft tooling assembly
US11117180B2 (en) 2018-05-11 2021-09-14 Stolle Machinery Company, Llc Quick change tooling assembly
US11208271B2 (en) 2018-05-11 2021-12-28 Stolle Machinery Company, Llc Quick change transfer assembly
US11370015B2 (en) 2018-05-11 2022-06-28 Stolle Machinery Company, Llc Drive assembly
US11420242B2 (en) 2019-08-16 2022-08-23 Stolle Machinery Company, Llc Reformer assembly
US11534817B2 (en) 2018-05-11 2022-12-27 Stolle Machinery Company, Llc Infeed assembly full inspection assembly
US11565303B2 (en) 2018-05-11 2023-01-31 Stolle Machinery Company, Llc Rotary manifold

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995572A (en) * 1974-07-22 1976-12-07 National Steel Corporation Forming small diameter opening for aerosol, screw cap, or crown cap by multistage necking-in of drawn or drawn and ironed container body
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US20100107719A1 (en) * 2008-10-31 2010-05-06 Jeffrey Edward Geho Necking die with shortened land and method of die necking
US20100107718A1 (en) * 2008-10-31 2010-05-06 Karam Singh Kang Necking die with redraw surface and method of die necking
US10934104B2 (en) 2018-05-11 2021-03-02 Stolle Machinery Company, Llc Infeed assembly quick change features
US11097333B2 (en) 2018-05-11 2021-08-24 Stolle Machinery Company, Llc Process shaft tooling assembly
US11117180B2 (en) 2018-05-11 2021-09-14 Stolle Machinery Company, Llc Quick change tooling assembly
US11208271B2 (en) 2018-05-11 2021-12-28 Stolle Machinery Company, Llc Quick change transfer assembly
US11370015B2 (en) 2018-05-11 2022-06-28 Stolle Machinery Company, Llc Drive assembly
US11534817B2 (en) 2018-05-11 2022-12-27 Stolle Machinery Company, Llc Infeed assembly full inspection assembly
US11565303B2 (en) 2018-05-11 2023-01-31 Stolle Machinery Company, Llc Rotary manifold
US11420242B2 (en) 2019-08-16 2022-08-23 Stolle Machinery Company, Llc Reformer assembly

Also Published As

Publication number Publication date
JPS499467A (enrdf_load_stackoverflow) 1974-01-28
JPS5339019B2 (enrdf_load_stackoverflow) 1978-10-19
ZA725008B (en) 1974-02-27
CA993730A (en) 1976-07-27

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