US3789553A - Device for holding a ring-formed workpiece intended to be machined on its inner envelope surface - Google Patents

Device for holding a ring-formed workpiece intended to be machined on its inner envelope surface Download PDF

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Publication number
US3789553A
US3789553A US00153387A US3789553DA US3789553A US 3789553 A US3789553 A US 3789553A US 00153387 A US00153387 A US 00153387A US 3789553D A US3789553D A US 3789553DA US 3789553 A US3789553 A US 3789553A
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United States
Prior art keywords
ring
workpiece
holding
envelope surface
contact
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Expired - Lifetime
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US00153387A
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English (en)
Inventor
E Johansson
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Individual
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Individual
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Publication date
Priority claimed from SE848170A external-priority patent/SE344297B/xx
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically

Definitions

  • ABSTRACT Device for holding a ring-formed workpiece with an inner and outer envelope surface and with transversal end surfaces which particularly are flat, which workpiece which for instance can consist of a ball race or any other conventional type of ring, when set up is to be subjected to machinging such as grinding or polishing and the like of the inner envelope surface, characterized by two holding members for holding the workpiece axially, each of which with one of its sides acts upon a transversal surface each and has one side provided with a circular surface, each of which surfaces are in contact with its opposite surface via a pressuremedium cushion or film for securing of the workpiece, one of the holding members then being capable of being driven, and by a number of transversal clamping jaws, which jaws are arranged at a distance from each other and can be put into contact with the outer envelope surface of the workpiece via a pressuremedium cushion or film whereby pressure medium cushions limit movements of the ring-formed workpiece axially in both directions as well as transversely in all directions.
  • the present invention relates to a device for holding a ring-formed workpiece with an inner and an outer envelope surface and with transversal end surfaces.
  • An example of such a workpiece is a ball race.
  • the holding device is to have such properties that it can hold the ball race, or any other conventional type of ring, although a ball race has been chosen as an example of an embodiment in this specification, but which in the following will simply be referred to as a ring, in such a way that its inner envelope surface can be machined, for instance through grinding or polishing, while maintaining stringent requirements stipulated for the envelope surface.
  • a ball race has been chosen as an example of an embodiment in this specification, but which in the following will simply be referred to as a ring, in such a way that its inner envelope surface can be machined, for instance through grinding or polishing, while maintaining stringent requirements stipulated for the envelope surface.
  • the ring itself during the course of the machining, has been subjected to certain reciprocal transversal movements, which are undesirable, as the requirements stipulated then cannot be completely fulfilled.
  • the purpose of the present invention is to achieve a substantial damping of the above-mentioned transversal movements, and this is achieved according to the present invention in that the ring, both transversally and axially, is set up in such a way that pressuremedium cushions r films limit the movements of the ring axially, and then in both directions, as well as transversally, also in all directions.
  • the ring is held transversally by one or a plurality of clamping jaws, for instance three clamping jaws, so that the ring will have three-point suspension. Between each clamping jaw and the outer envelope surface of the ring a pressure medium is applied, so that a pressure-medium cushion or film arises.
  • the ring is held at both of its side surfaces by a holding member on each side, of a disc-formed character, the outer surfaces which are not in contact with the ring then being opposite a surface each via a pressure medium, and the last-mentioned surfaces can then move towards each other under the influence of the pressure, so that the ring is clamped axially between two pressure-medium cushions.
  • the ring is thus clamped both transversally and axially between pressure-medium cushions, which have the capa- I bility of damping undesirable movements that are applied to the ring.
  • FIG. 1 shows the device for holding a ring which is to be machined internally, and the device is then shown in the position where it is about to receive a ring
  • FIG. 2 shows the ring secured transversally, and the axial clamping has commenced
  • FIG. 3 shows the ring entirely secured both transversally and axially
  • FIG. 4 shows a cross-section of the device according to FIG. 3 just before the axial clamping has been completed and before pressure medium is fed to the device, in which FIG. 5 shows the device with the ring entirely clamped and with pressure medium applied.
  • 1 is a ring with a square cross-section.
  • this ring there is a ring 3 arranged, which has a square cross-section.
  • the ring On its peripheral surface the ring is provided with a radial peripheral flange 4, which runs in a groove 5, made in the wall 6.
  • the groove5 has two opposite groove walls, the distance between which exceeds the thickness of the radial flange 4. This involves that the ring 3 can move axially between the walls 7, and between the wall 7 and the flange 4 a spring arrangement or the like 8 can appropriately be arranged.
  • the bottom of the peripheral groove 5 is connected with a drilled hole 5A for the supply of pressure medium.
  • the ring 3 has a flat right side surface 9 in which a flat contact surface is milled, where two parts have been given the reference designations 10 and 11. In the contact surface 9, two peripheral channels or pockets 12 and-13 have been made for pressure medium.
  • the ring-formed holding member 15 is in contact with the contact surface containing the parts 10 and 11. At its inner edge, said member is provided with a tubular, cylindrical hub 17, the outer surface of which is intended to be in contact with'a workpiece.
  • the ring-formed member has an outer peripheral surface 18, which is opposite an inner peripheral surface 19 of aring 20.
  • the purpose of the ring 20 is to limit the axial and transversal movements of the holding member 15.
  • the holding member On its left side, the holding member is connected with a bow 21 made of spring steel or the like, which is connected in its center to a shaft 22. Through the bow 21 and shaft the holding member 15 can be caused to rotate around its axis.
  • a guidingjaw 23 is arranged, which has two ring-formed square contact surfaces 24 and 25. These contact surfaces each enclose pockets 26 and 27 for the supply of pressure medium through the drilled holes 28 and 29.
  • the two contact surfaces 24 and are made in such a way that their overall surfaces constitute two supporting points for the outer envelope surface of a cylindrical ring.
  • a clamping jaw 30 is moreover arranged, which contains a ring-formed contact surface 31 which encloses a cavity 32 for pressure medium, which is supplied via a drilled hole 33.
  • This clamping jaw is rotatable around an axle 34. Together with the contact surfaces 24 and 25, the contact surface 31 achieves three-point suspension or, more precisely, three-surface suspension, of a cylindrical ring.
  • a disc-formed flange 35 is shown, which has a flat left side 36.
  • a contact surface with two parts 37 and 38 has been milled.
  • channels 39 and 40 have been made, which are intended for pressure medium, and the channel 40 is then divided into pockets.
  • the channels are connected to a number of drilled holes, for the supply of a pressure medium.
  • the holding member has an oblique peripheral surface 44, which is opposite an oblique inner peripheral surface 45 of a ring 46.
  • the purpose of the ring is to limit the axial and transversal movements of the holding member 42.
  • the holding member 42 is provided with a tubular, cylindrical hub 47, the end surface of which is intended to coact with the side surface of a ring 48.
  • the ring has an outer envelope surface 49 and an inner envelope surface which are to be machined.
  • the device described above for holding a cylindrical ring for machining of its inner envelope surface functions in the following way.
  • the outer envelope surface of the ring 48 is in contact with the clamping jaws 23 and via pressure medium cushions or films.
  • the envelope surface49 has no metallic contact.
  • the sides of the ring 48 are in contact with the hubs 17 and 47 of the holding members 15 and 42.
  • the holding members have their side surfaces 16 and 43 in direct contact with pressure-medium cushions or pressure-medium films. Further, through their oblique peripheral surfaces 18 and 44, the holding members are also in contact with pressure-medium cushions or films.
  • the ring 48 is also via the holding members 15 and 42 in contact with pressure-medium cushions of films, both transversally and axially.
  • the ring 4 can withstand undesirable stresses in any direction whatsoever, without any detrimental influence on the machining, since said pressure-medium cushions or films dampen such undesirable movements, 7
  • pressuremedium conductors can be provided with valve controls, so that automatic setting of an inserted ring is possible. It is then advisable to have said peripheral channels divided up so that a number of pockets will be formed which have a separate supply of pressure medium. lf fluid is used as a pressure medium, the laws of hydrostatic suspension and thereby self-centering will then of course be applicable.
  • the suspension will act hydrostatically.
  • the suspension can be converted in a known way to hydrodynamic suspension.
  • the slots 18, 19 and 45 can have such a width that pressure-medium cushions or films will not be formed.
  • Device for supporting a ring-formed workpiece with an inner and outer envelope surface and with transversal axial end surfaces comprising a pair of bolding members adapted to engage the axial end surfaces of said workpiece to support the workpiece axially, each of said holding members including a ring member engageable with the axial end surface and mounted for floating movement in the holding member by fluid pressure means, means for rotating one of said holding members and a plurality of clamping jaw members each having an enclosed pocket confronting the outer envelope surface of said workpiece, fluid pressure means for pressurizing said pockets to provide a fluid cushion support whereby pressure medium cushions limit movements of the ring-formed workpiece axially in both directions as well as transversly in all directions.
  • each holding member consists of a ring-formed disc.
  • each disc at its inner edge, is provided with a tubular hub, the outer end of which is intended to be in contact with the end surfaces of the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00153387A 1970-06-18 1971-06-15 Device for holding a ring-formed workpiece intended to be machined on its inner envelope surface Expired - Lifetime US3789553A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE848170A SE344297B (enrdf_load_stackoverflow) 1970-06-18 1970-06-18
US15338771A 1971-06-15 1971-06-15

Publications (1)

Publication Number Publication Date
US3789553A true US3789553A (en) 1974-02-05

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Application Number Title Priority Date Filing Date
US00153387A Expired - Lifetime US3789553A (en) 1970-06-18 1971-06-15 Device for holding a ring-formed workpiece intended to be machined on its inner envelope surface

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US (1) US3789553A (enrdf_load_stackoverflow)
FR (1) FR2095345B1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023937A (en) * 1973-08-21 1977-05-17 Landis Lund Limited Chuck assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2446696A1 (fr) * 1979-01-19 1980-08-14 Sp K Bjur Procede de reglage de la position et d'entrainement en rotation d'une piece et dispositif pour sa mise en oeuvre
CH663744A5 (de) * 1984-09-17 1988-01-15 Rene Keller Dr Vorrichtung fuer die schleifbearbeitung der innenflaeche oder aussenflaeche eines ringfoermigen werkstueckes.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2715304A (en) * 1953-06-01 1955-08-16 Bryant Grinder Corp Work clamping and releasing mechanism for centerless grinding machines
US2955391A (en) * 1958-12-22 1960-10-11 Norton Co Work positioning mechanism for machine tools
US3056238A (en) * 1960-06-24 1962-10-02 Heald Machine Co Grinding machine
US3493273A (en) * 1968-02-09 1970-02-03 Babcock & Wilcox Co Hydrostatic machine tool spindle
US3591988A (en) * 1969-07-08 1971-07-13 Litton Industries Inc Work rest

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2715304A (en) * 1953-06-01 1955-08-16 Bryant Grinder Corp Work clamping and releasing mechanism for centerless grinding machines
US2955391A (en) * 1958-12-22 1960-10-11 Norton Co Work positioning mechanism for machine tools
US3056238A (en) * 1960-06-24 1962-10-02 Heald Machine Co Grinding machine
US3493273A (en) * 1968-02-09 1970-02-03 Babcock & Wilcox Co Hydrostatic machine tool spindle
US3591988A (en) * 1969-07-08 1971-07-13 Litton Industries Inc Work rest

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023937A (en) * 1973-08-21 1977-05-17 Landis Lund Limited Chuck assembly

Also Published As

Publication number Publication date
FR2095345A1 (enrdf_load_stackoverflow) 1972-02-11
FR2095345B1 (enrdf_load_stackoverflow) 1974-08-19

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