EP0657233A1 - Procédé de laminage pour la fabrication des poulies et installation pour la mise en oeuvre du procédé - Google Patents

Procédé de laminage pour la fabrication des poulies et installation pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0657233A1
EP0657233A1 EP94119529A EP94119529A EP0657233A1 EP 0657233 A1 EP0657233 A1 EP 0657233A1 EP 94119529 A EP94119529 A EP 94119529A EP 94119529 A EP94119529 A EP 94119529A EP 0657233 A1 EP0657233 A1 EP 0657233A1
Authority
EP
European Patent Office
Prior art keywords
rolls
rolling
process according
finished product
semi
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.)
Granted
Application number
EP94119529A
Other languages
German (de)
English (en)
Other versions
EP0657233B1 (fr
Inventor
Mario Eustacchio
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.)
AGLA SpA
Original Assignee
AGLA SpA
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Filing date
Publication date
Application filed by AGLA SpA filed Critical AGLA SpA
Publication of EP0657233A1 publication Critical patent/EP0657233A1/fr
Application granted granted Critical
Publication of EP0657233B1 publication Critical patent/EP0657233B1/fr
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
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels
    • B21H1/04—Making articles shaped as bodies of revolution discs; disc wheels with rim, e.g. railways wheels or pulleys

Definitions

  • the present invention relates to a rolling process for the manufacture of pulleys having a plurality of V-shaped peripheral grooves.
  • pulleys of the said type are manufactured by successive rolling steps: more particularly, the cylindrical outer surface of a semi-finished product obtained by rolling or drawing from a flat disc is gradually subjected to plastic deformation by means of rolls having annular projections adapted to form the profiles of the grooves by cold-heading.
  • the various rolling steps are effected by different operating heads, each of which has a respective roll.
  • the use of a single roll for each rolling step means that that roll must exert the entire load needed to achieve the desired deformation alone and acting on a single zone of contact of limited area. This causes the material to creep suddenly from the centre towards the ends of the zone of contact which leads to very high loads on the sides of the roll projections. This thus causes rapid wear and, in some cases, fracture of the roll itself. Moreover any small divergence of the straight line of action of the roll from the axis of the piece results in undesirable transverse components of the load being exerted on the roll itself and on the operating head.
  • the object of the present invention is to provide a rolling process for the manufacture of pulleys having peripheral grooves which is free from the disadvantages of the known processes specified above.
  • This object is achieved by the present invention in that it relates to a rolling process for the manufacture of a pulley having a plurality of peripheral grooves, in which a circular, semi-finished product is rotated and subjected to successive steps of plastic deformation by means of rolls having working profiles, characterised in that at least one of the steps is implemented by two said rolls operating simultaneously on the same peripheral portion of the semi-finished product intended to have the said grooves.
  • the pulley 1 includes a central portion 2 of flat, disc shape having a through-hole 3 with an axis of symmetry 4 and a substantially cylindrical peripheral portion 5 in the outer surface of which is formed a plurality of V-shaped grooves 6. More particularly, in the non-limitative example described and illustrated here, there are five grooves 6.
  • a rolling machine for implementing the process of the present invention is generally indicated 7.
  • the machine 7 comprises essentially a base 8 from the opposite ends of which a first head support structure 9 and a second head support structure 10 project upwardly.
  • the head support structure 9 supports a chuck 11 which is axially fixed but rotatable about its axis 12 which is horizontal, the chuck being coupled for rotation with drive means not illustrated through conventional transmission means.
  • the head support structure 10 supports an hydraulic cylinder 13 coaxial with the chuck 11 and having an axially slidable shaft 14; the shaft 14, at its end facing the chuck 11, carries a second chuck 15 which is movable axially with the shaft 14 and mounted for free rotation thereon.
  • a slide 16 is also rigidly fixed to the shaft 14 and is slidable axially along three guide rods 17 parallel to the axis of the cylinder 13 and supported at their ends by the head support structures 9 and 10. These rods 17, disposed one below the cylinder 13 and two above it and on opposite sides thereof, constitute a guide for the shaft 14 and absorb the radial loads bearing thereon as a result of its own weight and the working as will be clarified below.
  • the head support structure 9 also supports a plurality of operating heads 18 disposed in a radial array around the chuck 11 and of which only one is illustrated; conveniently there are four of these heads 18.
  • Each operating head 18 includes a respective carriage 19 movable radially (with respect to the axis 12) by drive means not illustrated; a respective implement 20 of the type illustrated in Figure 3 may be mounted on each carriage 19.
  • the implement 20 comprises essentially a forked support 21 and two rolls 22 and 23 adapted to act on a semi-finished product, that is on the pulley 1 being manufactured.
  • the forked support 21 has a tapered rear attachment portion 24 which is adapted to be pivoted on its carriage 19 about an axis 25 parallel, in use, to the axis 12 and, for this purpose, has a hole 26 for housing a pivot pin, not illustrated.
  • the forked support 21 further includes a front portion 27 for supporting the rolls 22, 23, constituted by a pair of spaced parallel plates 28 which project from the portion 24 and support between them, close to respective corners, respective pins 29 of the rolls themselves. More particularly, the pins 29 have respective axes 30 which are parallel to the axes 25 and 12 and are disposed symmetrically on opposite sides of a plane M of symmetry through the implement 20 containing the axis 25 and, in use, the direction of advance R of the tool 20.
  • the rolls 22, 23 are mounted so as to project partly from the front edges of the plates 28 and may thus cooperate with a peripheral portion of the semi-finished product mounted between the chucks 11, 15 of the rolling machine 7.
  • the rolls 22 and 23 are substantially cylindrical in shape and have respective working profiles 31 and 32 adapted to generate a profile 33 on the outer surface of the peripheral portion 5 of the pulley 1 similar to that illustrated.
  • a semi-finished product 1' in the form of a flat disc ( Figure 3) intended to be converted into the pulley 1 by the process of the present invention is supplied to the machine 7 by a handling device (not shown) and is positioned on the chuck 11 so that its axis of symmetry is coincident with the axis 12; then the semi-finished product is gripped fictionally between the chucks 11 and 15 by the action of the hydraulic cylinder 13.
  • the chuck 11 is rotated and, with the advance of one of the carriages 19 along its own straight line of action R, an implement 20, which is different in each of the four successive steps of the present process, is brought into contact with the peripheral portion of the semi-finished product intended to constitute the peripheral portion 5 of the finished pulley 1.
  • the forked support 21 centres itself automatically so as to dispose the rolls 22 and 23 symmetrically on opposite sides of the straight line of action R ( Figure 3).
  • a first implement 20 supports rolls 22 and 23 having working profiles 31 and 32 as shown in Figure 4a. More particularly, the profile 31 of the roll 22 is straight while the profile 32 of the roll 23 is undulate, being constituted by a plurality of slight adjacent, interconnected, annular projections 34.
  • the simultaneous and synergic action of the rolls 22 and 23 is such as to deform a peripheral portion 5' of the semi-finished product (illustrated in broken outline) plastically to form the cylindrical peripheral portion 5 of the pulley 1 and to generate rounded grooves 6, of limited depth, complementary with the projections 32 of the working profile and spaced by portions 6' with a straight profile.
  • second and third implements 20 are used which are equipped with rolls 22, 23 the profiles 31, 32 of which are illustrated in Figures 4b and 4c respectively.
  • the rolls 22, 23 have projections 34 with twice the axial spacing of the spacing of the grooves 6, the projections of one roll being staggered axially relative to the projections of the other roll operating simultaneously and the projections being separated from each other by portions 35 with straight profiles.
  • the rolls 22, 23 of each working pair thus work alternate grooves in the semi-finished product; moreover, for each pair of rolls 22 and 23, each projection 34 of the working profile 31 corresponds in radial section to a straight portion of the working profile 32, and vice versa.
  • a fourth implement 20 is activated, the rolls 22, 23 of which have the same working profile and this being complementary to the profile of the finished pulley 1.
  • the rolls 22, 23 used have projections 34 which become gradually more pronounced, that is, have a greater height and a less rounded head profile so that the grooves 6 produced in the pulley 1 become gradually deeper and more defined, the process changing, in practice, during the course of the various steps, from a roughing operation, in which the grooves 6 are roughly formed, to an operation in which the grooves are finished.
  • Figure 5 illustrates the working profiles 31, 32 of rolls 22, 23 used in a second embodiment of the process of the present invention.
  • this embodiment of the process although also usable to start from a semi-finished product in the form of a flat disc, is particularly adapted to the case in which the semi-finished product is of cup shape achieved by a preliminary drawing operation, not illustrated, and which thus already has a cylindrical wall 5 in which the grooves 6 are formed.
  • This process conveniently includes three steps, the working profiles 31, 32 of the rolls 22, 23 used in the first, second and third steps being illustrated in Figures 5a, 5b, 5c respectively.
  • the pairs of rolls 22, 23 in the first two steps have projections 34 which are staggered axially relative to each other as described with reference to Figures 4b, 4c; in the first step, the rolls 22, 23 have projections 34 of limited height and interconnected profiles while, in the second step, the projections 34 are more pronounced.
  • two rolls 22, 23 are used which are identical and have working profiles complementary to that of the finished pulley.
  • a pivoted fork as the support for the rolls ensures that the implement is centred automatically on the pulley being worked and compensates for any misalignment between the straight line of action of the working head and the axis of symmetry of the piece which, in conventional processes, causes dangerous transverse forces to act on the drive means of the head, and ensures that the deformation load is distributed uniformly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Forging (AREA)
EP94119529A 1993-12-10 1994-12-09 Procédé de laminage pour la fabrication des poulies et installation pour la mise en oeuvre du procédé Expired - Lifetime EP0657233B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930938A IT1261380B (it) 1993-12-10 1993-12-10 Procedimento di rullatura per la realizzazione di pulegge, e attrezzo impiegato in tale procedimento
ITTO930938 1993-12-10

Publications (2)

Publication Number Publication Date
EP0657233A1 true EP0657233A1 (fr) 1995-06-14
EP0657233B1 EP0657233B1 (fr) 2001-09-19

Family

ID=11411926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119529A Expired - Lifetime EP0657233B1 (fr) 1993-12-10 1994-12-09 Procédé de laminage pour la fabrication des poulies et installation pour la mise en oeuvre du procédé

Country Status (4)

Country Link
EP (1) EP0657233B1 (fr)
DE (2) DE69428332T2 (fr)
ES (1) ES2161740T3 (fr)
IT (1) IT1261380B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857527A2 (fr) * 1997-02-04 1998-08-12 AGLA S.p.A. Procédé, machine et appareil à rouleaux pour réaliser des produits axialement symmétriques, en particulier des poulies ou roues formés d'une ébauche en forme de disque
FR2777814A1 (fr) * 1998-04-28 1999-10-29 Denso Corp Procede de fabrication d'une poulie trapezoidale a gorges multiples
JP2020127966A (ja) * 2019-02-12 2020-08-27 株式会社デンソー プーリの製造方法及び製造装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144732A (en) * 1977-11-09 1979-03-20 Master Craft Engineering, Inc. Method and apparatus for forming one-piece pulleys
FR2527953A3 (fr) * 1982-06-02 1983-12-09 Ducellier & Cie Procede d'obtention d'une poulie multi-gorges et poulie ainsi obtenue
US5031296A (en) * 1990-05-14 1991-07-16 S.C. S.R.L. Machine tool for manufacturing pulleys or wheels
EP0552776A1 (fr) * 1992-01-24 1993-07-28 AGLA S.p.A. Procédé de roulage pour la fabrication de poulies à gorge unique ou multiple en forme de V et à roue phonique intégrale

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144732A (en) * 1977-11-09 1979-03-20 Master Craft Engineering, Inc. Method and apparatus for forming one-piece pulleys
FR2527953A3 (fr) * 1982-06-02 1983-12-09 Ducellier & Cie Procede d'obtention d'une poulie multi-gorges et poulie ainsi obtenue
US5031296A (en) * 1990-05-14 1991-07-16 S.C. S.R.L. Machine tool for manufacturing pulleys or wheels
EP0552776A1 (fr) * 1992-01-24 1993-07-28 AGLA S.p.A. Procédé de roulage pour la fabrication de poulies à gorge unique ou multiple en forme de V et à roue phonique intégrale

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857527A2 (fr) * 1997-02-04 1998-08-12 AGLA S.p.A. Procédé, machine et appareil à rouleaux pour réaliser des produits axialement symmétriques, en particulier des poulies ou roues formés d'une ébauche en forme de disque
EP0857527A3 (fr) * 1997-02-04 1999-06-16 AGLA S.p.A. Procédé, machine et appareil à rouleaux pour réaliser des produits axialement symmétriques, en particulier des poulies ou roues formés d'une ébauche en forme de disque
FR2777814A1 (fr) * 1998-04-28 1999-10-29 Denso Corp Procede de fabrication d'une poulie trapezoidale a gorges multiples
US6115920A (en) * 1998-04-28 2000-09-12 Denso Corporation Method of manufacturing multi-grooved V pulley
DE19918866B4 (de) * 1998-04-28 2007-01-11 Denso Corp., Kariya Verfahren zur Herstellung einer mehrrilligen Keilriemenscheibe
JP2020127966A (ja) * 2019-02-12 2020-08-27 株式会社デンソー プーリの製造方法及び製造装置

Also Published As

Publication number Publication date
EP0657233B1 (fr) 2001-09-19
ES2161740T3 (es) 2001-12-16
DE69428332T2 (de) 2002-06-13
ITTO930938A1 (it) 1995-06-10
DE657233T1 (de) 1996-02-15
ITTO930938A0 (it) 1993-12-10
IT1261380B (it) 1996-05-20
DE69428332D1 (de) 2001-10-25

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