US3322086A - Method and apparatus for forming screw threads - Google Patents

Method and apparatus for forming screw threads Download PDF

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Publication number
US3322086A
US3322086A US358812A US35881264A US3322086A US 3322086 A US3322086 A US 3322086A US 358812 A US358812 A US 358812A US 35881264 A US35881264 A US 35881264A US 3322086 A US3322086 A US 3322086A
Authority
US
United States
Prior art keywords
thread
forming means
wall
die
cylindrical
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
Application number
US358812A
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English (en)
Inventor
Walter J Pentesco
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.)
American Flange and Manufacturing Co Inc
Original Assignee
American Flange and Manufacturing 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 American Flange and Manufacturing Co Inc filed Critical American Flange and Manufacturing Co Inc
Priority to US358812A priority Critical patent/US3322086A/en
Priority to GB13861/65A priority patent/GB1098746A/en
Priority to DK175365AA priority patent/DK119922B/da
Priority to FI650848A priority patent/FI50844C/fi
Priority to AT324165A priority patent/AT263506B/de
Priority to CH498865A priority patent/CH435186A/fr
Priority to DE1452197A priority patent/DE1452197C3/de
Priority to SE4706/65A priority patent/SE317641B/xx
Priority to NO157603A priority patent/NO121264B/no
Priority to ES0311652A priority patent/ES311652A1/es
Priority to BE662313D priority patent/BE662313A/xx
Priority to NL656504554A priority patent/NL143151B/xx
Application granted granted Critical
Publication of US3322086A publication Critical patent/US3322086A/en
Priority to MY157/69A priority patent/MY6900157A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • 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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • B21D51/50—Making screw caps

Definitions

  • This invention relates to the manufacture of cylindrical, thin walled threaded members and more particularly to a method and apparatus for forming screw threads in the sidewalls of light gauge metal closure elements such as caps, plugs, nozzles, container necks and the like.
  • the invention successfully overcomes the above mentioned disadvantages, plus others inherent in the various prior art practices, by providing a method and an apparatus for imparting a continuous helical screw thread formation to the cylindrical sidewall of a member while the same is positioned in an ordinary punch press.
  • the invention consequently effectively eliminates the need for relative rotary movement between the workpiece and a die and gives rise to advantages in terms of etficiency and flexibility heretofore unknown in this art.
  • Another object of the invention is to provide a novel method for forming screw threads in the cylindrical sidewalls of light gauge metal closure elements.
  • a further object is to provide a novel method for forming a continuous screw thread in an integrally formed upstanding neck extending up from a container wall surrounding an opening therein.
  • a still further object is to provide a novel method of imparting a continuous helical thread formation to a thin walled tubular member by utilizing an ordinary punch press.
  • a still further object is to provide apparatus for carrying out the method of the invention.
  • a more detailed object is to provide a method and apparatus for threading light gauge metal closure elements as one of the steps in a progressive die operation.
  • FIG. 1 is a part sectional, part elevational view of a characteristic cylindrical workpiece prior to the threading operation.
  • FIG. 2 is a vertical section, including the workpiece of FIG. 1, of die elements for performing the method of thread forming in accordance with the invention.
  • FIG. 3 is a vertical section similar to FIG.- 2 but with the die elements moved into position with the workpiece therebetween ready for the commencement of the thread forming.
  • FIG. 4 is a vertical sectional view showing the die element moved into position where the thread has been formed in the workpiece.
  • FIG. 4A is a part sectional, part elevational view similar to FIG. 4 but with thread formed in accordance with the method of the invention in a workpiece having a closed end.
  • FIG. 5 is part sectional, part elevational view of a completed nozzle and screw cap both formed in accordance with the invention.
  • FIG. 6 is part sectional, part elevational view of a closure flange and the invention.
  • FIG. 7 is an exploded sectional view of apparatus in accordance with the invention for performing the method in accordance with the invention.
  • FIG. 1 A cylindrical workpiece generally indicated by the numeral 1 is shown in FIG. 1.
  • the significant aspect of the workpiece 1 in order that the thread forming method of the invention may be performed on it is that it include a thin walled cylindrical portion preferably of light gauge metal.
  • the workpiece 1 may be an intermediate formation in the manufacture of any thin walled, cylindrical member including principally a threaded portion.
  • the method and apparatus of the invention are particularly advantageous however when employed in the manufacture of various closure elements such as container necks, nozzles, flanges, caps and plugs.
  • closure elements such as container necks, nozzles, flanges, caps and plugs.
  • the workpiece 1 is shown as having a laterally extending base portion 2 which may represent the surrounding container wall from which the cylindrical neck or workpiece 1 has been upwardly drawn as a prior operation, or may simply be a flange to be further formed in a subsequent operation.
  • FIG. 2 the workpiece 1 is shown assembled together with means for forming the thread in accordance with the invention.
  • This thread forming means comprises a pair of die members each having the form of a helical coil spring.
  • the inner spring 3 when in relaxed condition, has a diameter slightly smaller than the internal diameter of the cylindrical workpiece while the outer spring 4, when in relaxed position has a diameter slighty greater than the outside diameter of the workpiece.
  • the springs and the workpiece are coaxially aligned either as shown in FIG. 2 with the workpiece positioned between them. Alternately it is also contemplated that the springs would be in a nested relationship and be positioned adjacent the free upper end 8 of the workpiece. In either case, the thread forming die members 3 and 4, before being moved plug both formed in accordance withspring 4 is held in into engagement with the workpiece, are telescoped about that workpiece so as to encase the same as shown in FIG. 3.
  • the cross-sectional diameter of the wire forming the inner spring 3 is slightly smaller than that of the wire forming the outer spring 4. This arrangement has been found to give a desirable thread from as here shown, however, the relative cross-sectional diameters of the wire forming the spring die members may be varied without departing from the invention in order to provide a particular thread contour.
  • the length of the spring die members 3 and 4 is dependent upon the number of threads it is desired to form in the workpiece. It is to be noted, however, that the contraction of the outer spring 4 will cause a slight endwise elongation thereof while the expansion of the inner spring 3 will cause the same to be correspondingly shortened. One end of each spring helix must be left free to provide for this length difierential. The use of a suitable surface lubricant in the forming step facilitates this endwise movement.
  • FIG. 7 An apparatus for actuating the springs for practicing the method of the invention as just described is shown in FIG. 7.
  • the inner spring member 3 isrheld in a helical channel 26 formed in a lower die which die is made up of a plurality of radially expandable jaw elements 25.
  • the spring 3 is fixed only at one end, such as at its outer end 27, in its jaw groove 26. The rest of the spring is free to move lengthwise with respect to the groove. This arrangement allows for slight rotational movement of the spring helix in its groove 26 as the spring expands and contracts.
  • the jaws 25 are radially expanded by the actuating spindle 28 which has an inclined cam surface 30 engaging the inclined cam follower surface portions 29 provided on the interior of the jaws 25.
  • the jaws 31 are each formed with'portions of a helical groove 32 extending into their interior surfaces and within which the spring 4 is seated.
  • the spring 4 preferably has its bottom end fixed in the overlying jaw groove 32 as seen at 33 permitting slight rotational movement of the rest of the spring with respect to its groove.
  • the jaws 31 are urged radially inwardly by engagement of their inclined cam fol-.
  • the operation of the thread forming die is as follows: First, with the die in its open position as shown in FIG. 7, the workpiece is inserted between the upper and lower die members in coaxial alignment to provide the relationship illustrated in FIG. 2. The die is then moved to its operative position with the springs 3 and 4 telescoped about the workpiece as shown in FIG. 3. At this point the springs 3 and 4, together with their respective supporting jaws 25 and 31, have completed their relative axial movement. Actuation of the die continues however by the continuing opposed axial movement of the spindle 28 and the actuating ring 36. This additional axial movement causes the cam surface 30 acting on its follower surfaces 29 to force the jaws 25 radially outwardly. At the same time the cam surface 35 engages its follower surface 34 and forces the jaws 31 radially inwardly. Eventually then the springs 3and 4 assume the position shown in FIG. 4.
  • the inner spring 3 acts upon the interior surface of the cylindrical workpiece to form the helical groove 6 radially outwardly while at the same time the outer spring 4 acts upon the exterior cylindrical surface to form the helical groove 5 radially inwardly.
  • the result is a smooth, accurate, helical screw thread formation. Removal of the finished workpiece from the die is accomplished by simply opening the die by reversing the above described steps.
  • FIG. 4A shows the same thread forming as illustrated in FIG. 4 except that here it is being performed on a cylindrical workpiece 10 having a closed end wall 11.
  • This workpiece represents an intermediate stage in the formation of a closure element such as a screw cap or a screw plug.
  • the surrounding flange 12 may have been given its final configuration at this point or it may still be part of a strip being worked upon in a progressive die operation. In the latter case, the workpiece would be blanked out of the strip and the flange 12 finally formed in a subsequent die station.
  • FIGS. 5 and 6 illustrate various types of closure elements readily capable of being threaded by employing the method of the invention.
  • FIG. 5 shows a screw cap 15 applied to a nozzle 16 which in turn is secured to a container wall at'17 in a well known manner.
  • FIG. 6 shows a screw plug 20 threadedly engaged within a flange 21. The flange is also secured at 22 in a well known manner to therein.
  • FIGS. 5 and 6 The various closure elements shown in FIGS. 5 and 6, and other comparable parts can be readily formed in this manner hence greatly increasing manufacturing efliciency e by avoiding the necessity for transferring partially finished parts from a punch press operation to a thread rolling operation and possibly back again to another press operation.
  • the method of forming screw threads in the cylindrical sidewalls of light gauge metal closure elements comprising the steps of coaxially locating a cylindrical wall intermediate an axially spaced inner and outer thread forming means, axially displacing said inner and outer thread forming means to a telescoped position radially encasing the inner and outer surfaces of said cylindrical wall, radially displacing said inner and outer thread forming means in opposed directions in continuous helical surface engagement with said intermediate cylindrical wall and forming said cylindrical wall between the same thereby imparting a continuous uninterrupted helical thread form to said wall.
  • Apparatus for imparting a screw thread formation to the wall of thin walled cylindrical members which comprises outer thread forming means including an inwardly facing thread forming surface having first spaced portions, an inner thread forming means concentric with and radially inwardly spaced with respect to said outer thread forming means and including an outwardly facing thread forming surface having second spaced portions formed for positioning between said first spaced portions of said outer thread forming means, means for contracting said outer thread forming means to reduce the radius of the same and means for expanding said inner thread forming means to increase the radius of the same with said outwardly facing thread forming surfaces protruding radially outwardly at least as far as said inwardly facing thread forming surfaces whereby a cylindrical thin walled member positioned between said inner and outer thread forming means will be formed into a continuous helical screw thread formation with said formation extending both interiorly and exteriorly of the normal cylinder of said wall, said outer and inner thread forming means being open helix coil springs, each of said springs having a plurality
  • Apparatus for imparting a screw thread formation to the wall of thin walled cylindrical members which comprises a segmental contractable die member formed of a plurality of segments positioned around an axis and formed to come together as a complete cylinder when in contracted position, means to contract said segments, a cylindrical pocket formed into said segmental die member from one end thereof and being concentric with respect to the axis thereof, exterior thread forming means carried by the side wall of said pocket and a mated expandable segmental die member axially positioned with respect to said segmental contractable die member, said expandable die member being formed with an exterior cylindrical surface, said surface being provided with interior thread forming means positioned about the same, said die members adapted to be positioned in telescoping relationship with a cylindrical wall positioned between said interior thread forming means and said exterior thread forming means, means for contracting said exterior threading forming means and means for expanding said interior thread forming means so that said interior thread forming means and said exterior thread forming means lie in radially overlapping relationship and the cylindrical wall
  • Apparatus for imparting a screw thread formation to the wall of thin walled cylindrical members which comprises outer thread forming means including inwardly facing continuous thread forming surface having first spaced portions, an inner continuous thread forming means concentric with and radially inwardly spaced with respect to said outer thread forming means and including an outwardly facing thread forming surface having second spaced portions formed for positioning between said first spaced portions of said outer thread forming means, means for contracting said outer thread forming means to reduce the radius of the same and means for expanding said inner thread forming means to increase the radius of the same whereby a cylindrical thin Walled member positioned between said inner and outer thread forming means will be formed into a continuous helical screw thread formation with said formation extending both interiorly and exteriorly of the normal cylinder of said wall.
  • Apparatus for imparting a screw thread formation to the wall of thin walled cylindrical members which comprises a segmental contractable die member formed of a plurality of segments positioned around an axis and formed to come together as a complete cylinder when in contracted position, means to contract said segments, an axially extending cylindrical pocket formed into said segmental die member from one end thereof exterior thread forming means carried by the side wall of said pocket and moveable with respect thereto a mated expandable segmental die member axially positioned with respect to said segmental contractable die member, said expandable die member being formed with an exterior cylindrical surface, interior thread forming means carried by said exterior cylindrical surface and moveable with respect thereto, said die members adapted to be positioned in telescoping relationship with a cylindrical wall positioned between said interior thread forming means and said exterior thread forming means, means for contracting said exterior threading forming means and means for expand- 7 ing said interior thread forming means so that said interior thread forming means and said exterior thread forming means lie in radially overlapping relationship and
  • said outer and inner thread forming means being open helixes each having a plurality of turns.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Closures For Containers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US358812A 1964-04-10 1964-04-10 Method and apparatus for forming screw threads Expired - Lifetime US3322086A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US358812A US3322086A (en) 1964-04-10 1964-04-10 Method and apparatus for forming screw threads
GB13861/65A GB1098746A (en) 1964-04-10 1965-04-01 Improvements relating to methods and apparatus for forming screw threads
DK175365AA DK119922B (da) 1964-04-10 1965-04-06 Apparat til formning af gevind.
FI650848A FI50844C (fi) 1964-04-10 1965-04-07 Laite pulloja ja sentapaisia säiliöitä varten tarkoitetun metallisen s uljinhylsyn valmistamiseksi, jossa hylsyssä on kierukkamainen ruuvikie rre.
AT324165A AT263506B (de) 1964-04-10 1965-04-08 Vorrichtung und Verfahren zur Fertigung eines Schraubengewindes in der Wand eines dünnwandigen, zylindrischen Körpers
DE1452197A DE1452197C3 (de) 1964-04-10 1965-04-09 Vorrichtung zur Herstellung von ein Schraubgewinde aufweisenden, metallischen Verschlußkapseln für Flaschen und ähnliche Behälter
CH498865A CH435186A (fr) 1964-04-10 1965-04-09 Procédé et appareil pour former un filet de vis
SE4706/65A SE317641B (fr) 1964-04-10 1965-04-09
NO157603A NO121264B (fr) 1964-04-10 1965-04-09
ES0311652A ES311652A1 (es) 1964-04-10 1965-04-09 Metodo con su dispositivo para impartir una rosca helicoidal continua a una pared cilindrica recta relativamente delgada.
BE662313D BE662313A (fr) 1964-04-10 1965-04-09
NL656504554A NL143151B (nl) 1964-04-10 1965-04-09 Inrichting voor het vormen van een schroefdraad in een relatief dunne cilindrische wand.
MY157/69A MY6900157A (en) 1964-04-10 1969-12-30 Improvements relating to methods and apparatus for forming screw threads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US358812A US3322086A (en) 1964-04-10 1964-04-10 Method and apparatus for forming screw threads

Publications (1)

Publication Number Publication Date
US3322086A true US3322086A (en) 1967-05-30

Family

ID=23411143

Family Applications (1)

Application Number Title Priority Date Filing Date
US358812A Expired - Lifetime US3322086A (en) 1964-04-10 1964-04-10 Method and apparatus for forming screw threads

Country Status (13)

Country Link
US (1) US3322086A (fr)
AT (1) AT263506B (fr)
BE (1) BE662313A (fr)
CH (1) CH435186A (fr)
DE (1) DE1452197C3 (fr)
DK (1) DK119922B (fr)
ES (1) ES311652A1 (fr)
FI (1) FI50844C (fr)
GB (1) GB1098746A (fr)
MY (1) MY6900157A (fr)
NL (1) NL143151B (fr)
NO (1) NO121264B (fr)
SE (1) SE317641B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382699A (en) * 1965-03-11 1968-05-14 Continental Can Co Method and apparatus for threading closure caps

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254924A (en) * 1938-10-28 1941-09-02 American Flange & Mfg Closure arrangement for opening of sheet-metal containers
US2320435A (en) * 1941-10-09 1943-06-01 Aircraft Screw Prod Co Expanding tool
US2442965A (en) * 1944-09-15 1948-06-08 Aluminium Company Forming caps, closures, and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254924A (en) * 1938-10-28 1941-09-02 American Flange & Mfg Closure arrangement for opening of sheet-metal containers
US2320435A (en) * 1941-10-09 1943-06-01 Aircraft Screw Prod Co Expanding tool
US2442965A (en) * 1944-09-15 1948-06-08 Aluminium Company Forming caps, closures, and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382699A (en) * 1965-03-11 1968-05-14 Continental Can Co Method and apparatus for threading closure caps

Also Published As

Publication number Publication date
DE1452197A1 (de) 1969-04-24
NL143151B (nl) 1974-09-16
GB1098746A (en) 1968-01-10
DE1452197B2 (de) 1973-07-19
BE662313A (fr) 1965-08-02
MY6900157A (en) 1969-12-31
NL6504554A (fr) 1965-10-11
CH435186A (fr) 1967-05-15
NO121264B (fr) 1971-02-08
DK119922B (da) 1971-03-15
SE317641B (fr) 1969-11-24
ES311652A1 (es) 1966-02-16
AT263506B (de) 1968-07-25
FI50844B (fr) 1976-04-30
DE1452197C3 (de) 1974-02-14
FI50844C (fi) 1976-08-10

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