US3839890A - Method of manufacturing flexible conical tubes and punch used for same - Google Patents

Method of manufacturing flexible conical tubes and punch used for same Download PDF

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Publication number
US3839890A
US3839890A US00309773A US30977372A US3839890A US 3839890 A US3839890 A US 3839890A US 00309773 A US00309773 A US 00309773A US 30977372 A US30977372 A US 30977372A US 3839890 A US3839890 A US 3839890A
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United States
Prior art keywords
punch
ridge
extrusion
tube
axis
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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US00309773A
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English (en)
Inventor
M Phlippoteau
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.)
Societe de Conditionnement en Aluminium SCAL GP SA
Original Assignee
Societe de Conditionnement en Aluminium SCAL GP SA
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 Societe de Conditionnement en Aluminium SCAL GP SA filed Critical Societe de Conditionnement en Aluminium SCAL GP SA
Priority to US476868A priority Critical patent/US3890822A/en
Application granted granted Critical
Publication of US3839890A publication Critical patent/US3839890A/en
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
    • 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
    • B21D51/36—Making hollow objects characterised by the use of the objects collapsible or like thin-walled tubes, e.g. for toothpaste
    • 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
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • 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
    • B21C25/00—Profiling tools for metal extruding

Definitions

  • ABSTRACT The invention relates to a method flexible metal tubes of frustoconic finished tube is initially produced extrusion with a conical Appl. No: 309,773
  • a semiby inverse-impact se outer surface is ore helical projecting ridges; the semi-finished tube is then fini walled conical mandrel.
  • the tubes were placed in a conically shaped die and ex panded by means of an inflatable membrane or even by the direct introduction of air, the orifice of the tube being plugged by means of a frustoconical member advancing at a rate commensurate with the expansion of the filling opening.
  • the tapering of an annealed cylindrical tube involves some amount of cold working of the metal, which makes it all the more difficult to form the fold by which the tube is closed, because this operation is carried out in the most heavily cold-worked zone, i.e., in the zone surrounding the tilling opening, and because the metal has to remain elastic in use.
  • the punch is provided over part of its height with circular ridges having envelopes which widen from the head of the punch to form a frustum, the axis of which coincides with the axis of the punch.
  • FIG. 1 is a sectional elevational view which diagrammatically illustrates an arrangement for carrying out the method of this invention
  • FIG. 2 is an enlarged sectional view taken through a ridge of the punch
  • FIG. 3 is an elevational view of an apparatus for smoothing the blank to complete the operation.
  • FIG. 4 is an elevational view, partially in section, which shows a modification of the punch enabling the tube to be smoothed during extrusion.
  • the invention relates to a method of manufacturing flexible, frustoconical tubes from a metal blank by inverse-impact extrusion, carried out with a punch pro vided over at least a part of its height, with at least one helical projecting ridge, the cross section of which widens from the head of the punch to form a frustum whose axis coincides with the axis of the punch.
  • the opening angle of this frustum is generally between l and 2 although, for tubes of very large diameter and considerable length, it can be greater than 2.
  • the gradient which the helical ridge forms with a plane perpendicular to the longitudinal axis of the punch is of the order of 20.
  • the distance between two successive passages on a generatrix of one or more parallel helical ridges is be tween 12 and 20 mm.
  • the blank obtained by extrusion with the punch described is smoothened on a smooth-walled frustoconical mandrel.
  • Smoothing can be carried out by means of a tool over which the blank has to pass to a subsequent operation normally intended for finishing purposes such as, for example, trimming, external lacquering, etc.
  • Smoothing can also be carried out during the extrusion operation itself. In this event, use is made of a punch at least the outer portion of which can be rotated.
  • the invention also relates to the tubes formed by the method described above.
  • the arrangement diagrammatically illustrated in FIG. 1 comprises a die 11 of the kind normally used for forming flexible metal tubes by inverseimpact extrusion.
  • the punch 2 is slightly frustoconical in its general shape, corresponding to the taper with which it is required to provide the tube.
  • the opening angle of these tubes is normally between 1 and 2, i.e., the angle formed by a generatrix with the longitudinal axis is between 30 and 1. In the case of tubes of very large diameter and considerable length, this angle can be greater than 2.
  • the punch 2 At its base, the punch 2 comprises an annular extrusion ridge 3 whose function is well known. After extrusion, the metal cools and, as a result, shrinks. Accordingly, allowance has to be made for this shrinkage by increasing the diameter of the punch, depending upon the coefficient of expansion of the metal at the temperatures in question. In the case of conventionally produced components, this increase varies between 0.05 and 0.1 mm.
  • This clearance between the extruded metal and the punch should be maintained over the entire length of the conical punch.
  • this result is obtained by means of one or more helical ridges 4.
  • the angle a, which this helix forms with a plane perpendicular to the longitudinal axis of the punch, is preferably of the order of about 20.
  • helical ridges may optionally have to be distributed uniformly over the periphery of the punch in such a way that the distance between two helices is between 12 and mm, as measured perpendicularly to the helices inclined at about 20 to the horizontal.
  • FIG. 2 is a section through one ridge severing as an example. It is similar in shape to a trapezium, although it should be pointed out that the base of this trapezium forms a certain angle with the axis of the punch while the minor base is substantially parallel to the axis of the punch.
  • the height x of this pseudo-trapezium i.e., the height of the ridge, can vary within the range of 0.2 and 0.5 mm. In the example selected, it is 0.3
  • the metal advances in the direction of arrow 5 (from the bottom of FIG. 2) and encounters a ridge.
  • the inclination of this side should be such that the metal can slide over it quickly, i.e., without prolonged contact. An angle of about has given good results in practice.
  • the width of the minor base should be as reduced as possible while the slope of the second oblique side has no real bearing upon the operation of the machine.
  • a blank, placed in the die l, is flattened by the punch 2 under a calculated impact.
  • the metal for example aluminum
  • the tube issues through the gap left between the extru' sion edge 3 and the die 1, and is directed parallel to the axis of the punch 2 until it comes into contact with a ridge 4 which it does gradually, generatrix by generatrix, by virtue of the helical shape of this ridge.
  • the included surface 6 of the ridge 4 diverts the flow of metal to the top of the ridge where it returns to its original direction parallel to the axis of the punch 2. until it comes into contact with the following ridge.
  • the semi-finished tube 7 is removed from the punch 2, having one or more helical bands joined together by shoulders.
  • the tube has to be subjected to a smoothing operation. There is no need to bring another machine into the production line to carry out this operation because this work can be carried out simultaneously with one of the finishing operations normally provided in existing production lines, for example during trimming of the skirt, deburring of the rod or screwthreading of .the orifice.
  • the semi-finished tube 7 is placed on a mandrel 8 with the same conical form as the interior of the finished tube.
  • This mandrel 8 is rotated by means of the pulley wheel 9.
  • One or more rollers, mounted for free rotational movement on a spindle 11 parallel to the generatrix of the mandrel 8, are moved axially by any type of suitable mechanism (not shown in the drawing). Under the effect of the rollers 10, the shoulders between the helical bands are removed as by ironing out.
  • the tube Upon completion of the operation (see FIG. 3), the tube has the smooth frustoconical form required.
  • the punch 12 comprises a cylindrical core 13 which must be strong enough to be able to carry out impact extrusion. It is widened at its free end to form the complete impact surface 114, including the extrusion edge 3. This widening results in the formation of a ledge 15 which acts as a support for a sleeve 16.
  • this sleeve 16 is shaped in the same way as the punch 2; in other words, its outer surface is slightly frustoconical, and it comprises one or more helical ridges 4.
  • the inner surface of this sleeve 16 is cylindrical.
  • the sleeve as a whole is mounted for rotational movement about the core 13.
  • the sleeve 16 carries a pulley wheel which is driven, for example, by a motor 18 or by any other type of suitable drive means.
  • the sleeve is rotated at high speed and the helical irregularities are immediately removed so effectively that the tube does not have to be smoothed off.
  • a method of manufacturing flexible metal tubes of frustoconical shape from a metal blank by inverseimpact extrusion wherein extrusion is carried out by impacting the metal blank with a punch having axially spaced helical projecting ridges over at least a portion of its length and in which the cross section of each ridge is generally in the shape of a trapezium having a base which tapers outwardly gradually from the direction of the head end of the punch to a frustum the axis of which coincides with the axis of the punch.
  • roller comprises a portion of the punch and wherein the smoothing is carried out by rotating the punch during extrusion.
  • a method of manufacturing flexible tubes of frustoconical shape from a metal blank by inverse-impact extrusion wherein extrusion is carried out by impacting the metal blank with a punch having at least one helical projecting ridge over at least a portion of its length and in which the envelope of the ridge widens from the direction of the head of the punch to form a frustom the axis of which coincides with the axis of the punch in which the extruded tube is smoothed during extru sion by the punch having sleeves at least one of which is rotated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US00309773A 1971-11-25 1972-11-27 Method of manufacturing flexible conical tubes and punch used for same Expired - Lifetime US3839890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US476868A US3890822A (en) 1971-11-25 1974-06-06 Punch for manufacturing flexible conical tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7142251A FR2161446A5 (sv) 1971-11-25 1971-11-25

Publications (1)

Publication Number Publication Date
US3839890A true US3839890A (en) 1974-10-08

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ID=9086384

Family Applications (1)

Application Number Title Priority Date Filing Date
US00309773A Expired - Lifetime US3839890A (en) 1971-11-25 1972-11-27 Method of manufacturing flexible conical tubes and punch used for same

Country Status (21)

Country Link
US (1) US3839890A (sv)
AR (1) AR195891A1 (sv)
AT (1) AT324089B (sv)
AU (1) AU462349B2 (sv)
BE (1) BE791879A (sv)
BR (1) BR7208292D0 (sv)
CA (1) CA979297A (sv)
CH (1) CH566177A5 (sv)
DD (1) DD105401A5 (sv)
DE (1) DE2256816C3 (sv)
DK (1) DK146584C (sv)
ES (1) ES408954A1 (sv)
FI (1) FI57707C (sv)
FR (1) FR2161446A5 (sv)
GB (1) GB1372909A (sv)
IT (1) IT971089B (sv)
NL (1) NL165958C (sv)
NO (1) NO134245C (sv)
SE (1) SE403442B (sv)
TR (1) TR17072A (sv)
ZA (1) ZA728274B (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890822A (en) * 1971-11-25 1975-06-24 Scal Gp Condit Aluminium Punch for manufacturing flexible conical tubes
US4321816A (en) * 1978-08-08 1982-03-30 Kyodo Insatsu Kabushiki Kaisha Metal tube and apparatus and method for manufacturing the same
US5737959A (en) * 1994-05-30 1998-04-14 Korbel; Andrzej Method of plastic forming of materials
US20050247097A1 (en) * 2002-07-26 2005-11-10 Yuji Maeda Oval cross section metal tube producing device and producing method
US20060204693A1 (en) * 2003-01-24 2006-09-14 Gery Bernard Marie Dambricourt Fully emptiable flexible tube with an amplified return effect
US20140331733A1 (en) * 2011-12-16 2014-11-13 Postech Academy-Industry Foundation Torsional extreme-plastic processing method of conic metal pipe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1216282A (en) * 1916-09-21 1917-02-20 Fred S Carver Method of working copper.
US2096018A (en) * 1934-06-25 1937-10-19 Rocoro Inc Apparatus for method for forming bottle caps
US3029507A (en) * 1957-11-20 1962-04-17 Coors Porcelain Co One piece thin walled metal container and method of manufacturing same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1216282A (en) * 1916-09-21 1917-02-20 Fred S Carver Method of working copper.
US2096018A (en) * 1934-06-25 1937-10-19 Rocoro Inc Apparatus for method for forming bottle caps
US3029507A (en) * 1957-11-20 1962-04-17 Coors Porcelain Co One piece thin walled metal container and method of manufacturing same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890822A (en) * 1971-11-25 1975-06-24 Scal Gp Condit Aluminium Punch for manufacturing flexible conical tubes
US4321816A (en) * 1978-08-08 1982-03-30 Kyodo Insatsu Kabushiki Kaisha Metal tube and apparatus and method for manufacturing the same
US5737959A (en) * 1994-05-30 1998-04-14 Korbel; Andrzej Method of plastic forming of materials
US20050247097A1 (en) * 2002-07-26 2005-11-10 Yuji Maeda Oval cross section metal tube producing device and producing method
US7219522B2 (en) * 2002-07-26 2007-05-22 Taisai Kako Co., Ltd. Oval cross section metal tube producing device and producing method
US20060204693A1 (en) * 2003-01-24 2006-09-14 Gery Bernard Marie Dambricourt Fully emptiable flexible tube with an amplified return effect
US7695789B2 (en) * 2003-01-24 2010-04-13 Cep Industrie Fully emptiable flexible tube with an amplified return effect
US20140331733A1 (en) * 2011-12-16 2014-11-13 Postech Academy-Industry Foundation Torsional extreme-plastic processing method of conic metal pipe
US9447487B2 (en) * 2011-12-16 2016-09-20 Postech Academy-Industry Foundation Torsional extreme-plastic processing method of conic metal pipe

Also Published As

Publication number Publication date
ZA728274B (en) 1974-01-30
DE2256816B2 (de) 1974-08-08
DE2256816A1 (de) 1973-06-07
FR2161446A5 (sv) 1973-07-06
BR7208292D0 (pt) 1973-10-09
SE403442B (sv) 1978-08-21
NO134245B (sv) 1976-05-31
GB1372909A (en) 1974-11-06
AU4903572A (en) 1974-06-06
BE791879A (fr) 1973-05-24
ES408954A1 (es) 1975-10-16
TR17072A (tr) 1974-04-25
FI57707C (fi) 1980-10-10
AU462349B2 (en) 1975-06-19
AT324089B (de) 1975-08-11
CH566177A5 (sv) 1975-09-15
DE2256816C3 (de) 1975-03-20
NL165958C (nl) 1981-06-15
FI57707B (fi) 1980-06-30
DK146584B (da) 1983-11-14
CA979297A (en) 1975-12-09
DD105401A5 (sv) 1974-04-20
NL165958B (nl) 1981-01-15
NL7215951A (sv) 1973-05-29
IT971089B (it) 1974-04-30
DK146584C (da) 1984-04-30
AR195891A1 (es) 1973-11-15
NO134245C (sv) 1976-09-08

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