US3920173A - Method and machine for manufacturing shaped parts from flat sheet metal - Google Patents

Method and machine for manufacturing shaped parts from flat sheet metal Download PDF

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Publication number
US3920173A
US3920173A US352491A US35249173A US3920173A US 3920173 A US3920173 A US 3920173A US 352491 A US352491 A US 352491A US 35249173 A US35249173 A US 35249173A US 3920173 A US3920173 A US 3920173A
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United States
Prior art keywords
shaping
strip
mandrel
rollers
generatrix
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Expired - Lifetime
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US352491A
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English (en)
Inventor
Dario Salata
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RETMECA SA
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RETMECA SA
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Publication date
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/041—Taper tube making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5185—Tube making

Definitions

  • the method is characterised in that the strip of sheet metal is displaced along a generatrix of a shaping mandrel whose crosssection varies progressively along this generatrix in predetermined manner by decreasing dimensions, and in that the strip of sheet metal, as it is displaced, is progressively 'bent around the shaping mandrel on either side of said generatrix by appropriate pressure means which constrain it to follow the contour and dimensions at the point where their action is exerted, and in that the point of action of said pressure means is displaced along the spindle according to any appropriate law for producing a desired variation of section on the shaped part thus obtained.
  • Such shaped parts may be the masts -of pleasure-boats, or support poles for the installation of external lighting.
  • Masts of this type which, however, constitute only one of the possible numerous applications of the present invention, are most frequently constituted by tubular shaped parts of light alloy, which are between 6 and 10 meters long and have a diameter which may vary between 50 to 150 mm; their cross-section is sometimes circular, sometimes oval and it may possibly compriseone or more longitudinal grooves serving for anchoring accessories, such for example as bolt-ropes, chainwales etc.
  • a first object of the present invention is to provide a method of manufacture by forming such shaped parts from a strip of flat sheet metal.
  • One of the known methods for forming a metal shaped part from a flat metal sheet consists in cold rolling the strip of sheet metal by passing it between pressure rollers which by successive bending operations, give the shaped part any predetermined section; nevertheless, shapedparts thus obtained may be only cylindrical and it is necessary to carry out a subsequent retreatment operation on the cylindrical tube thus obtained if it is desired to obtain a shaped part having a section varying progressively, such, for example, as a slightly conical mast or pole.
  • This re-treatment operation may, for example, consist in cutting a longitudinal notch in the shape of a very close Vin the tube and thereafter bringing the edges of the notch together and welding them.
  • a retreatment operation of this type complicates and makes the manufacture of such shaped parts difficult.
  • the invention relates essentially to a method for the manufacture of shaped parts of any length and having a closed or open section, varying progressively according to an entire desired range of variations, by shaping a strip of flat sheet metal on a single predetermined shaping mandrel.
  • the method of manufacture according to the invention is characterised in that the strip of sheet metal is displaced along a generatrix of a shaping mandrel, whose cross-section varies progressively along this generatrix in a predetermined manner by decreasing dimensions, and in that the strip of sheet metal during is displacement, is progressively bent around the shaping mandrel'on both sides of said generatrix by appropriate pressure means which impart thereto the shape and dimensions of the mandrel at the region where their action is exerted, and in that the point of action of said pressure means is displaced along the mandrel according to any appropriate law for producinga desired variation of section on the shaped part thus obtained.
  • the method of the invention allows high, speed production (of the order of l to 2 meters/minute for example) and lends itself to continuous manufacture by imparting an appropriate reciprocating motion to the shaping head.
  • Another object of the invention is to provide a machine for carrying out the abovedescribed method, which machine comprises a shaping mandrel having a cross-section decreasing progressively from its base and appropriately mounted in a fixed frame, and at least one shaping head which moves parallel to a generatrix of the spindle and supports at least one pair of shaping rollers and associated actuating means for applying a strip of flat sheet metal against the shaping mandrel on both sides of said generatrix, and being characterised in that it also comprises first drive means for moving the strip of sheet metal at a uniform speed along said generatrix and second drive means for the displacement of the shaping head with respect to the mandrel according to any appropriate predetermined law for producing the desired variation of section of the shaped part obtained.
  • FIG. 1 is a diagrammatic elevation of a machine according to the invention and showing only the essential parts;
  • FIGS. 2, 3, 4, 5 and 6 are detailed sectional views, to a larger scale, on the lines 11-", Ill-Ill, lV-IV, VV and Vl-Vl of FIG. 1, these sections illustrating the successive stages of the method for forming the shaped part from a strip of flat sheet metal.
  • the machine comprises a rigid frame comprising longitudinal girders an end support 2 from which a shaping mandrel 3 is cantilever mounted. and another end support 4 .on
  • the mandrel must be mounted on the frame of the machine so that it may be removed and interchanged.
  • the shaping spindle 3 has a cross-section decreasing progressively and homothetically along its upper generatrix.
  • the shaping mandrel 3 is secured to the support 2 with its axis slightly inclined above the horizontal by an angle suchthat its upper generatrix is substantially contained in the horizontal plane extending the upper plane of the end support 2; this arrangement ensures a virtually horizontal discharge of the shaped part as it is formed.
  • the machine includes a moveable shaping head 6 comprising a rigid carriage 7 supporting shaping rollers and their actuating mechanisms and movable along the longitudinal girders l of the machine frame, and a box 8 connected to the carriage 7 by a pivot 9 which allows it to slide vertically, the box being guided in its movements by the inclined slides
  • the inclination of the slides 5, which may be advantageously adjustable within certain limits, corresponds substantially to that of the lower generatrix of the shaping spindle 3. It will thus be understood that when the carriage 7 moves along the horizontal longitudinal girders l, the box 8 moves with it, while it is, in turn, displaced parallel to the lower generatrix of the shaping mandrel 3.
  • the movements of the movable head 6 are controlled by conventional means, such, for example, as a screw control means 7a driven by an electric motor 71; and at a speed which is uniform or variable according to the law of the desired variation of the dimensions of the section on the shaped part to be obtained.
  • the moveable head 6 supports a succession of rollers 1 or groups of machining rollers staggered along the longitudinal axis of the shaping mandrel 3 and acting, one after the other, on the strip of sheet metal 10 which moves forward in the direction of the arrow and at a uniform speed along the upper generatrix of the mandrel.
  • the respective functions of these various rollers or groups of rollers will become clear on examining FIGS.3 to 6 of the drawing, assumed to correspond to one and the same position of the movable head 6 on the machine frame.
  • other pre-shapingrollers may be provided for assisting the action of the roller 11 or for completing it with a view to facilitating the subsequent operation of the shapingrollers proper.
  • Shaping rollers 12 are at least two in number and may be supported by the carriage 7 or by the box 8 of the. movable head 6 with their axes substantially at'right angles to the axis of the shaping mandrel 3. These rollers:
  • these shaping rollers 12 are made from a material having ,resilient properties, for example rubber and have I a groove profile corresponding substantially to the configurationand to the radius ofcurvature of the middle section of the shaping mandrel 3; owing to their elastic-.
  • the shafts of the shaping rollers 12 must.
  • the invention envisages employing oleopneumatic jacks of adjustable force depending on the thickness of the metal to be shaped.
  • the rollers 12 may be set in rotation at a uniform speed and in the desired direction by means of electric motors 12a provided with reduction gears or even by means or' rotary hydraulc motors. This makes any other means for controlling the forwards movement of the strip of sheet metal 10 superfluous.
  • the shaping rollers above described seem the most appropriate for the manufacture of shaped parts of light alloys. Nevertheless, the number and shape of the shaping rollers as well as their constituent material may vary depending on the sections of the shaped parts to be obtained and on the nature of the metal used for their manufacture. Thus, for example, in the case where the shaped parts are to be made of steel, it would be suitable to substitute for the pair of rubber shaping rollers above described, a group of rollers constituted by a hard material, for example of polished steel, these rollers thus being distributed in pairs, two by two, on
  • the superfluous lateral parts may advantageously be previously folded outwards by means of other steel rollers having a straight profile, the folding line thus imparted to the shaped part serving to guide the shearing rollers.
  • the machine illustrated in the accompanying drawingthus comprises, downstream of the shaping rollers 12, a pair of folding rollers 13 and a pair of shearing rollers l4'both supported by the box 8 of the movable head 6, these steel rollers being provided with the same pressure means and being rotated in the same direction and at the same tangential speed as the shaping rollers 12, but being displaced parallel to the lower generatrix of the shaping cylinder 3.
  • FIG. 5 shows how therollers l3 finish off the shaping of the contour of the shaped part by bending the superfluous parts 15 of the strip of sheet metal substantially at right angles towards the outside.
  • FIG. 6 shows how the shearing rollers 14, whose cutting edges roll in the folding lines, detach the superfluous parts ls fromthe shaped part.
  • the movable'head 6 of the machine may also comprise, downstream of the shearing rollers 14, a spot or continuous welding apparatus 18 which may be used to connectithe lips ofthejoint of the shaped part at the end of the shaping operations.
  • the shaped part formed by'the abovedescribed machine progresses continuously along the shaping mandrel 3 and its shape as well as its sectional dimensions correspond, apart from the differences due to the thickness of the constituent metal, to those of the section of the shaping mandrel 3 in the vicinity of which the'action of the folding rollers 13 is exerted.
  • the shaped part obtained will be of uniform section determined as a function of the adjustment of the shaping head 6.
  • This displacement 'ofthe shaping head generally takes place at a speed less than that imparted to the strip of sheet metal; by way of example, these speeds may be respectively 0.3--m/mi'n and 1.8
  • the variation of thickness of the wall along the shaped part obtained may obey a linearlaw or any otherappropriate law, the regulation of the mechanism controlling the spacing of the rolls being designed accordingly; it is also possible to modify this spacing of the rolls discontinuously in order to obtain, if need be, sudden changes in the wall thickness of the shaped part.
  • the cycle of operation for forming the shaped part may be preceded and/or follow'edby any appropriate heat treatment.
  • the 'strip of rough sheet metal may be subjected to a continuous or discontinuous heat softening treatment by an apparatus 16, beforeit passes to the shaping machine, the observation being made in this case that by means of the method ac cording to the invention it is possible to produce shaped parts of hard metals or alloys which 'are not suited or ill-suitedto drawing.
  • the shaped part may be subjected at the same time as the shaping operations to a continuous or discontinuous head treatment by an apparatus 17 for restoring its characteristics, such as, for example, a hardening treatment able to impart thereto certain desired mechanical properties. 1
  • the preceding description implicitly envisages the assumption of discontinuous production, the strip of rough sheet metal being previously cut to the desired length and the width of thestrip being able to be cut in a flat condition, thus avoiding subsequent machining on the shaped part; the shaping head is thus operational only in one direction of displacement and at the end of each machining pass, it isrestored to its initial position ready for the next pass.
  • the machine described is quite suitable for continuous production, in which the strip of sheet metal would unwind from a roll, the shaping head being in this case operational in both directions of displacement between its end positions.
  • the machine delivers successive lengths of shaped part having sections increasing and decreasing alternately and it is an advantage to provide on the machine itself, an additional cutting apparatus designed for detaching these successive lengths of shaped part from each other, this apparatus moving in translation on the machine frame at the same speed as the strip of sheet metal and thus as the shaped part throughout the duration of a cutting operation and then returning automatically to its initial'position ready for the next operation.
  • shaping rollers could have no driving action on the. strip I of sheet metal, the latter being drawn externally as on a drawing bench.
  • the invention ineludes tubular shaped partsobtained by applying the method described and/or by means of a shaping machine such as that described above.
  • a method of manufacturing from a stripof flat sheet metal a shaped elongated part having a progressively varying cross section comprising: displacing said strip along a generatrix of a fixed shaping mandrel the cross section of which decreases progressively along said generatrix in a predetermined manner, and progressively bending said strip as it is displaced around said mandrel on either side of said generatrix so as to follow the shape and dimensions of said mandrel, by pressure means the point of action of which is variable along said mandrel to produce a desired variation in the cross sectionof the part to be shaped,
  • a machine for manufacturingf rom a strip of flat 1 sheet metal a shaped elongated part comprisingza frame, a shaping mandrel mounted on said frame and having a cross section decreasingprogressively in one direction at least one shaping head movable parallel to a generatrix of said mandrel, at least one pair of shaping rollers and associated actuating means supported 1 by said head for urging said strip against said shaping mandrel on either side of, said generatrix, first drive means for displacing said strip at a uniform speed along said generatrix, and second drive means for displacing said shaping head with respect to said mandrel for producing the desired variationin cross section of said.
  • llLA machine comprising at least one resilient pre-shaping roller supported by said movable head upstream of said shaping rollers, said pre-shaping roller being adapted to initiate bending of I said strip around said mandrel, and actuating means for I exerting pressure on said roller for rolling said'strip along said generatrix.
  • a machine according to claim 12, which, com prises a pair of folding rollers located upstreamofisaid shearing rollers for folding said portions outwardly, said shearingvrollers being guided along the creases formed in the strip by said folding rollers;
  • a method according to claim 2 which includes the step of welding the shaped part together where the,
  • edges of said strip have been cut off.
  • Amachine according to claim 12 comprising a welding apparatus supported by said movable head I downstream of, said rollers for connecting opposite adjacent edges on said shaped part where said portions have been cut off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US352491A 1972-04-24 1973-04-19 Method and machine for manufacturing shaped parts from flat sheet metal Expired - Lifetime US3920173A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH605072A CH554716A (fr) 1972-04-24 1972-04-24 Procede de fabrication par formage de profiles tubulaires, machine pour la mise en oeuvre du procede et profile ainsi obtenu.

Publications (1)

Publication Number Publication Date
US3920173A true US3920173A (en) 1975-11-18

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US352491A Expired - Lifetime US3920173A (en) 1972-04-24 1973-04-19 Method and machine for manufacturing shaped parts from flat sheet metal

Country Status (13)

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US (1) US3920173A (fr)
BE (1) BE798579A (fr)
BR (1) BR7302968D0 (fr)
CA (1) CA1002390A (fr)
CH (1) CH554716A (fr)
DE (1) DE2319819A1 (fr)
ES (1) ES413754A1 (fr)
FR (1) FR2181628B1 (fr)
GB (1) GB1413555A (fr)
IT (1) IT982103B (fr)
LU (1) LU67488A1 (fr)
NL (1) NL7305716A (fr)
ZA (1) ZA732694B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711009A (en) * 1986-02-18 1987-12-08 W. R. Grace & Co. Process for making metal substrate catalytic converter cores
US4846392A (en) * 1988-06-17 1989-07-11 Hinshaw Experimental Laboratories Limited Partnership Continuously variable speed, die-drawing device and process for metal, composites, and the like, and compositions therefrom
US5657922A (en) * 1995-07-14 1997-08-19 Univ Oklahoma State Machine and process for forming tapered or cylindrical utility poles from flat sheet metal
US5669992A (en) * 1996-01-30 1997-09-23 Bronsema; Brand Bumper beam making process
US5725266A (en) * 1996-06-24 1998-03-10 American Bumper & Mfg. Co. D-section bumper
US5813594A (en) * 1990-03-26 1998-09-29 Shape Corporation Apparatus for forming an end bumper for vehicles
US5970777A (en) * 1996-06-04 1999-10-26 Hunt; Gerald S. Method of making a money clip
US20040250404A1 (en) * 2003-01-14 2004-12-16 Cripsey Timothy J. Process for press forming metal tubes
US20060096099A1 (en) * 2003-05-08 2006-05-11 Noble Metal Processing, Inc. Automotive crush tip and method of manufacturing
EP2135697A2 (fr) * 2008-06-19 2009-12-23 Haas Maschinenbau GmbH Procédé de fabrication de scies d'entrée
US7918380B1 (en) * 2010-02-18 2011-04-05 Letzkus Kenneth R Method and apparatus for manufacturing welded tapered tubes
CN103608132A (zh) * 2011-06-17 2014-02-26 蒂森克虏伯钢铁欧洲股份公司 具有切口的空心型材的制造方法
CN114147491A (zh) * 2020-09-08 2022-03-08 上海弘铮技术服务中心 一种钢带滚切倒边机及钢带滚切倒边工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353348A1 (fr) * 1976-06-01 1977-12-30 Lamboley Gilbert Procede et dispositif pour la realisation d'un mat de voilier tubulaire a partir d'un flan, et mat de voilier obtenu
DE102006026136B3 (de) * 2006-06-03 2008-01-10 Hans Franke Kg Vorrichtung zum Formen von Hohlprofilen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1821850A (en) * 1929-02-11 1931-09-01 Union Metal Mfg Co Tapered tubular pole
US2581673A (en) * 1948-12-27 1952-01-08 Nat Electric Prod Corp Continuous method of making butt weld tubing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1427031A (fr) * 1964-11-28 1966-02-04 Nouvelle structure de mâts en alliages légers avec procédé et appareillage de fabrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1821850A (en) * 1929-02-11 1931-09-01 Union Metal Mfg Co Tapered tubular pole
US2581673A (en) * 1948-12-27 1952-01-08 Nat Electric Prod Corp Continuous method of making butt weld tubing

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711009A (en) * 1986-02-18 1987-12-08 W. R. Grace & Co. Process for making metal substrate catalytic converter cores
US4846392A (en) * 1988-06-17 1989-07-11 Hinshaw Experimental Laboratories Limited Partnership Continuously variable speed, die-drawing device and process for metal, composites, and the like, and compositions therefrom
US5813594A (en) * 1990-03-26 1998-09-29 Shape Corporation Apparatus for forming an end bumper for vehicles
US5657922A (en) * 1995-07-14 1997-08-19 Univ Oklahoma State Machine and process for forming tapered or cylindrical utility poles from flat sheet metal
US5669992A (en) * 1996-01-30 1997-09-23 Bronsema; Brand Bumper beam making process
US5970777A (en) * 1996-06-04 1999-10-26 Hunt; Gerald S. Method of making a money clip
US5725266A (en) * 1996-06-24 1998-03-10 American Bumper & Mfg. Co. D-section bumper
US5845948A (en) * 1996-06-24 1998-12-08 American Bumper & Mfg. Co. D-section bumper
US20040250404A1 (en) * 2003-01-14 2004-12-16 Cripsey Timothy J. Process for press forming metal tubes
US20050056075A1 (en) * 2003-01-14 2005-03-17 Cripsey Timothy J. Process for press forming metal tubes
US20060096099A1 (en) * 2003-05-08 2006-05-11 Noble Metal Processing, Inc. Automotive crush tip and method of manufacturing
EP2135697A2 (fr) * 2008-06-19 2009-12-23 Haas Maschinenbau GmbH Procédé de fabrication de scies d'entrée
EP2135697A3 (fr) * 2008-06-19 2014-12-03 Haas Maschinenbau GmbH Procédé de fabrication de scies d'entrée
US7918380B1 (en) * 2010-02-18 2011-04-05 Letzkus Kenneth R Method and apparatus for manufacturing welded tapered tubes
CN103608132A (zh) * 2011-06-17 2014-02-26 蒂森克虏伯钢铁欧洲股份公司 具有切口的空心型材的制造方法
CN103608132B (zh) * 2011-06-17 2016-05-25 蒂森克虏伯钢铁欧洲股份公司 具有切口的空心型材的制造方法
CN114147491A (zh) * 2020-09-08 2022-03-08 上海弘铮技术服务中心 一种钢带滚切倒边机及钢带滚切倒边工艺

Also Published As

Publication number Publication date
FR2181628A1 (fr) 1973-12-07
BR7302968D0 (pt) 1974-06-27
FR2181628B1 (fr) 1975-04-11
LU67488A1 (fr) 1973-07-06
DE2319819A1 (de) 1973-11-08
ES413754A1 (es) 1976-06-01
CA1002390A (en) 1976-12-28
GB1413555A (en) 1975-11-12
NL7305716A (fr) 1973-10-26
AU5455973A (en) 1974-10-17
CH554716A (fr) 1974-10-15
BE798579A (fr) 1973-08-16
ZA732694B (en) 1974-04-24
IT982103B (it) 1974-10-21

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