EP0256830B1 - Machine pour former des configurations sur une pièce rotative - Google Patents

Machine pour former des configurations sur une pièce rotative Download PDF

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Publication number
EP0256830B1
EP0256830B1 EP87307072A EP87307072A EP0256830B1 EP 0256830 B1 EP0256830 B1 EP 0256830B1 EP 87307072 A EP87307072 A EP 87307072A EP 87307072 A EP87307072 A EP 87307072A EP 0256830 B1 EP0256830 B1 EP 0256830B1
Authority
EP
European Patent Office
Prior art keywords
lever device
tool
clamping
support surface
bed
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
EP87307072A
Other languages
German (de)
English (en)
Other versions
EP0256830A2 (fr
EP0256830A3 (en
Inventor
Malcolm Edward Hillier
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.)
MARBAIX LAPOINTE LIMITED
Original Assignee
MARBAIX LAPOINTE Ltd
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 MARBAIX LAPOINTE Ltd filed Critical MARBAIX LAPOINTE Ltd
Publication of EP0256830A2 publication Critical patent/EP0256830A2/fr
Publication of EP0256830A3 publication Critical patent/EP0256830A3/en
Application granted granted Critical
Publication of EP0256830B1 publication Critical patent/EP0256830B1/fr
Anticipated expiration legal-status Critical
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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
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • B21H5/027—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls by rolling using reciprocating flat dies, e.g. racks
    • 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
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other

Definitions

  • the invention relates to machines for forming configurations on or in a rotary workpiece, and particularly relates to apparatus for holding a forming tool of such a machine.
  • the machines may be pressure forming machines, used for forming grooves, splines or gear teeth on a rotary shaft such as a gear or crank shaft of an internal combustion engine.
  • the machines may be broach turning or cutting machines, in which a rack-like cutter is moved over a rotary workpiece to form a desired shape therein, for example a surface channel.
  • EPO 181132 shows apparatus for holding a tool of a machine for pressure forming surface configurations on a rotary workpiece comprising an elongate support on which a tool is mountable, first automatic means for shifting the support longitudinally for adjusting the position of the tool and second automatic means for securing the support in a shifted position. It is an object of this invention to provide improved apparatus for holding a tool of a machine for pressure forming surface configurations on a rotary workpiece.
  • apparatus for releasably clamping a tool for forming configurations on a rotary workpiece characterised in that it comprises: an elongate member having a bed and at least two support surfaces, rising from the bed in different planes; releasable clamping means comprising a lever device rotatably mounted on a spindle in the vicinity of a first support surface, the lever device having an engagement part shaped such that it can force a tool toward both the first support surface and a second support surface when the lever device is rotated in the clamping direction, which is the direction that moves the engagement part of the lever device towards the other support surface, the lever device also having a further part projecting away from the first-mentioned part; a slide means engageable with the lever device for rotation thereof in the clamping direction, the slide means having a wedge profile engageable with the further part of the lever device, and a biasing means connected to the lever device to bias said device away from the clamping direction.
  • the slide may have a wedge profile engaging the further part.
  • the slide means may be carried by an elongate carrier which may be reciprocable longitudinally by actuating means.
  • the actuating means may comprise a hydraulic piston and cylinder arrangement.
  • clamping means driven by the hydraulic cylinder which is a double-acting piston and cylinder arrangement having two coaxial carriers extending on either side of the cylinder to actuate the two clamping devices.
  • apparatus 1 for holding a tool (not shown) of a rotary workpiece (that is one which rotates during the forming operation, though it could also rotate in use) comprising an elongate member 2 on which the tool is mountable and which member has a plurality of support surfaces 3 and 4, and means 5 to engage and urge the tool bodily against the support surfaces 3 and whereby to clamp the tool in an operative position.
  • the means 5 in the embodiment shown is a rotatable lever device 6.
  • lever devices 6 for each tool, and there are two tools in line, at 7 and 8, in upper and lower elongate members, of which the lower member 2 only is shown in the drawings.
  • the devices 6 are identical and so only one will be described in detail.
  • the elongate member 2 in which each tool is mounted is identical in having a bed 9, which is inclined, with a heel 10 and toe plate 11 and heel/toe plate 12 which provide support surfaces 3 and 4 which rise at substantially 90° to one other from the bed 9.
  • the lever device 6 is mounted in a recess 13 and has a part 14 which has a gear tooth surface profile or configuration 14 a and in use engages a complementary part of the tool.
  • the lever device 6 is mounted on a spindle or shaft 15 for rotation, and has a further part 16 projecting away from the first-mentioned part 14 and which further part 16 is of bull-nose shape and is engageable by a slide means in the form of a wedge 17 to rotate the lever device 6.
  • the wedge 17 is carried by an elongate carrier 18 which is reciprocable longitudinally by an actuating means in the form of a double acting piston and cylinder arrangement 19.
  • the piston 19 is a hydraulic piston situated between the two respective lever devices 6 for each tool, the carriers 18 being carried by the piston rods 20.
  • the devices 6 include biasing means 21 in the form of coil tension springs which bias the levers to the position shown in Figure 1.
  • a tool for forming a configuration such as gear profiles in the surface of a rotary workpiece, such as a metal shaft, is an elongate metal block with transverse surface grooves in it so that it is in the form of a rack, and is known as such or as a rack cassette.
  • the grooved surface would be uppermost when the rack is on the lower bed 2 shown.
  • the rack is of generally square cross-section and in the rear (as considered in use) surface there are two channel-shaped blind slots, terminating at a position remote from the grooved surface, in other words adjacent the in use lower surface 9, in an enlarged part so that the channel is effectively of T-shape.
  • the enlarged part has an angled and tapered surface profile which is effectively a camming surface of complementary shape to that of the gear tooth configuration 14 a of the projecting part 14 of the lever device 6.
  • the piston and cylinder arrangement 19 is actuated to move the wedge 17 to rotate the lever device 6 so that that device is effectively at right angles to the surface 4.
  • the tool is then offered up to the bed, above it, with the channels aligned with a respective part 14, and is then lowered to rest on the bed 9.
  • the piston and cylinder arrangement 19 is then actuated to move the piston to the right as viewed in Figure 1.
  • the female parts have non-return valves which are normally closed, but which are opened by the male parts, or drogues, to complete the hydraulic circuit so that there is thus a "solid" hydraulic connection throughout the system and it is therefore unnecessary to maintain hydraulic force and the wedges 17, which are effectively self-locking, remain in position to clamp the tool via the lever devices 6.
  • a forming operation can then be carried out, usually by reciprocating the upper tools in unison longitudinally in an opposite direction to the lower tools while a workpiece between them is rotated. As many passes as are necessary are carried out to form the desired configuration.
  • the operation is then repeated on a succeeding workpiece, and so on. If it is necessary to change a tool, for example because a different configuration is to be formed on a workpiece, or because a tool is worn, it is merely necessary to pressurize the cylinder of the piston and cylinder arrangement 19 to move the lever devices 6 to the substantially 90° position, when the tool can simply be slid clear and replaced by another one using the sequence already described.
  • the apparatus thus provides a simple yet efficient method of interchangeability of tools in machines of the kind described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping On Spindles (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)

Claims (6)

  1. Appareil (1) pour serrer de manière libérable un outil servant à former des configurations sur une pièce à usiner rotative, caractérisé en ce qu'il comprend :
       un organe allongé (2) présentant un banc (9) et au moins deux surfaces d'appui (3, 4) s'élevant à partir du banc (9) dans des plans différents ;
       un moyen de serrage libérable (5) comprenant un dispositif à levier (6) monté de façon à pouvoir effectuer une rotation sur un axe (15) dans le voisinage d'une première surface d'appui (4), le dispositif à levier (6) présentant une partie à engagement (14) formée de telle sorte qu'elle puisse forcer un outil en direction à la fois de la première surface d'appui et d'une seconde surface d'appui (3) lorsque l'on fait effectuer une rotation au dispositif à levier dans le sens de serrage, qui est le sens qui déplace la partie à engagement (14) du dispositif à levier (6) en direction de l'autre surface d'appui (3), le dispositif à levier (6) présentant également une partie supplémentaire (16) faisant saillie à partir de la partie (14) mentionnée la première ;
       un moyen à coulisse (17) capable d'engagement avec le dispositif à levier (6) pour effectuer la rotation de celui-ci dans le sens de serrage, le moyen à coulisse (17) présentant un profil en coin capable d'engagement avec la partie supplémentaire (16) du dispositif à levier, et un moyen d'inclinaison (21) raccordé au dispositif à levier (6) pour incliner ledit dispositif (6) dans un sens différent du sens de serrage.
  2. Appareil selon la revendication 1, caractérisé en ce que cette partie (14) présente un profil à surface en denture d'engrenage.
  3. Appareil selon la revendication 1 or la revendication 2, caractérisé en ce que le moyen d'inclinaison (21) comprend un ressort à boudin.
  4. Appareil selon une revendication précédente quelconque, caractérisé en ce que le moyen à coulisse (17) est porté par un support allongé (18) qui est capable de mouvement alternatif longitudinalement à l'aide d'un moyen de commande (19).
  5. Appareil selon la revendication 4, caractérisé en ce que le moyen de commande (19) comprend un arrangement à piston hydraulique et cylindre.
  6. Appareil selon la revendication 5, caractérisé en ce qu'il existe deux moyens de serrage espacés l'un de l'autre (5) entraînés par un arrangement (19) à piston et cylindre à double action présentant deux supports coaxiaux (18) s'étendant de chaque côté du cylindre pour actionner les deux dispositifs de serrage.
EP87307072A 1986-08-11 1987-08-10 Machine pour former des configurations sur une pièce rotative Expired - Lifetime EP0256830B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8619554A GB2193669B (en) 1986-08-11 1986-08-11 Machines for forming configurations on a rotary workpiece
GB8619554 1986-08-11

Publications (3)

Publication Number Publication Date
EP0256830A2 EP0256830A2 (fr) 1988-02-24
EP0256830A3 EP0256830A3 (en) 1990-01-24
EP0256830B1 true EP0256830B1 (fr) 1995-02-22

Family

ID=10602558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87307072A Expired - Lifetime EP0256830B1 (fr) 1986-08-11 1987-08-10 Machine pour former des configurations sur une pièce rotative

Country Status (4)

Country Link
EP (1) EP0256830B1 (fr)
DE (1) DE3751079T2 (fr)
ES (1) ES2070821T3 (fr)
GB (1) GB2193669B (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791257A (en) * 1972-03-27 1974-02-12 Ind Inc Machine tool tooling

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392747A (en) * 1943-08-23 1946-01-08 American Broach & Machine Co Pull head for broaching machines
DE898436C (de) * 1950-12-23 1953-11-30 Westfaelische Metall Ind G M B Walzbacken fuer Gewindewalzmaschinen
US3183697A (en) * 1962-01-02 1965-05-18 Michigan Tool Co Locating fixture
US3793866A (en) * 1972-04-04 1974-02-26 Anderson Cook Inc Gear forming machines
US3818736A (en) * 1972-10-10 1974-06-25 Caterpillar Tractor Co Tooth forming machine
DE2552441C2 (de) * 1975-11-22 1982-07-22 Kutscher, Hans-Werner, 3300 Braunschweig Schnellspannvorrichtung zum Festspannen von Werkzeugen oder Werkstücken
US4028921A (en) * 1976-02-13 1977-06-14 Caterpillar Tractor Co. Tooth forming rack with replaceable inserts
US4574605A (en) * 1984-08-29 1986-03-11 Ex-Cell-O Corporation Forming machine with multiple work stations
GB8428220D0 (en) * 1984-11-08 1984-12-19 Gaston E Marbaix Ltd Pressure forming surface configurations on rotary workpiece

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791257A (en) * 1972-03-27 1974-02-12 Ind Inc Machine tool tooling

Also Published As

Publication number Publication date
EP0256830A2 (fr) 1988-02-24
ES2070821T3 (es) 1995-06-16
DE3751079D1 (de) 1995-03-30
GB8619554D0 (en) 1986-09-24
DE3751079T2 (de) 1995-10-19
EP0256830A3 (en) 1990-01-24
GB2193669B (en) 1991-01-16
GB2193669A (en) 1988-02-17

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