EP0687523A1 - Procédé de rectification cylindrique sans centre d'une pièce ainsi que rectifieuse pour la mise en oeuvre de ce procédé - Google Patents

Procédé de rectification cylindrique sans centre d'une pièce ainsi que rectifieuse pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0687523A1
EP0687523A1 EP95108493A EP95108493A EP0687523A1 EP 0687523 A1 EP0687523 A1 EP 0687523A1 EP 95108493 A EP95108493 A EP 95108493A EP 95108493 A EP95108493 A EP 95108493A EP 0687523 A1 EP0687523 A1 EP 0687523A1
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EP
European Patent Office
Prior art keywords
grinding
workpiece
grinding wheel
wheel
internal
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.)
Withdrawn
Application number
EP95108493A
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German (de)
English (en)
Inventor
Urs Tschudin
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0687523A1 publication Critical patent/EP0687523A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/12—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces both externally and internally with several grinding wheels

Definitions

  • the invention relates to a method for centerless cylindrical grinding of a workpiece according to the preamble of patent claim 1.
  • the invention further relates to a grinding machine for performing the method.
  • the American patent US-A-4 497 138 describes a grinding machine in which an annular chuck provided with a hydraulic bearing is provided for a workpiece, so that several surfaces of the workpiece can be machined at the same time without being repeatedly clamped into the chuck should be. Due to the chuck, however, it is not possible to machine the entire surface of the workpiece at once.
  • the invention has for its object to provide a simple and inexpensive method for centerless cylindrical grinding of a workpiece, which enables simultaneous processing of the entire inside and the outside of the workpiece.
  • the stated object is achieved by the features of patent claim 1.
  • the workpiece is held in a three-point support by the workpiece support, the external grinding wheel and the regulating wheel, which ensures the required stability. In this way an expensive and complicated feed, which also wears out and entails maintenance costs, is avoided.
  • the inner grinding wheel is moved in and out along a reference axis during grinding, the outer grinding wheel and the regulating wheel each being retracted horizontally by means of a feed drive perpendicular to the axis of rotation of the workpiece to such an extent that the respective material removal from the outside and inside of the workpiece and the respective grinding wheel removal of the outer and inner grinding wheel can be compensated at any time with respect to the reference axis.
  • a particular advantage of this embodiment is the fact that the required dimensional adjustment of the inner grinding wheel is offset against the feeds of the outer grinding wheel and the regulating wheel. A simple internal grinding spindle that can be moved in one direction is therefore sufficient.
  • FIG. 1 shows a side view of the grinding machine according to the invention and illustrates the method according to the invention.
  • a driven external grinding wheel 1 (only partially shown and connected to a grinding spindle, not shown) is rotatable about an axis running perpendicular to the plane of the drawing and is used for centerless cylindrical grinding of a workpiece 4.
  • the external grinding wheel 1 can be moved in and out horizontally by means of a controllable feed drive perpendicular to its axis of rotation.
  • a driven control wheel 2 (only partially shown and connected to a control spindle, not shown) is rotatable about a further axis running perpendicular to the plane of the drawing and serves to drive the workpiece 4.
  • the control wheel 2 can be perpendicular to it by means of a further, controllable feed drive
  • the axis of rotation can be extended and retracted horizontally.
  • a workpiece support 3 (only partially shown) is arranged between the outer grinding wheel 1 and the regulating wheel 2 and serves to support the workpiece 4 during the grinding process. It is designed, for example, as one or more vertical supports (depending on the size of the workpiece 4 to be machined) arranged one behind the other in the direction of the axis of rotation of the workpiece 4. It can also be designed as a single block.
  • the upper side of the workpiece support 3, which forms the support surface for the workpiece 4 is advantageously designed obliquely, so that the workpiece 4 is automatically held on the regulating wheel 2 when the grinding wheel 1 is extended.
  • the workpiece 4 to be machined is essentially tubular.
  • a driven internal grinding wheel 5 connected to an internal grinding spindle, not shown, is rotatable about a further axis, for example perpendicular to the plane of the drawing, and is used for internal grinding of the workpiece 4.
  • the internal grinding wheel 5 can be moved in one of the direction of its axis of rotation by means of a further, controllable feed drive open ends of the workpiece 4 are moved in and out again.
  • the internal grinding wheel 5 can also be moved horizontally by means of its feed drive perpendicular to its axis of rotation.
  • the grinding method according to the invention during centerless cylindrical grinding of the workpiece 4 by the outer grinding wheel 1, the inside of the workpiece 4 is simultaneously ground by means of the inner grinding wheel 5, the workpiece 4 being rotated by means of the regulating wheel 2 during the simultaneous grinding of its outside and inside and only by the workpiece support 3 , the outer grinding wheel 1 and the regulating wheel 2 is held.
  • the workpiece 4 is thus held in a three-point support: the workpiece support 3 holds the workpiece 4, the regulating wheel 2 drives the workpiece 4, and the outer grinding wheel 1 removes the material from the outer diameter.
  • grinding is the first, non-round phase in which the workpiece 4 is rounded.
  • a layer with a desired thickness is ground from the rounded workpiece 4.
  • the outer grinding wheel 1 is rotated very quickly, and large radial forces are exerted on the workpiece 4. These large forces no longer occur during finish grinding.
  • the workpiece 4 is kept particularly stable during the roughing phase of the centerless cylindrical grinding on the outside. This is used according to the invention for simultaneous internal grinding of the inside of the workpiece 4. The required stability is ensured without the need for an expensive and complicated chuck, which also wears out and entails maintenance costs.
  • a simple and inexpensive method for centerless cylindrical grinding of a workpiece is thus realized, which enables simultaneous machining of the entire inside and the outside of the workpiece.
  • the workpiece 4 is loaded and unloaded only once, so that time is saved. Since no chuck or other clamping devices are used, there are no maintenance costs due to their wear.
  • the simultaneous machining of the inside and outside also guarantees the concentricity of the bore with the outside diameter.
  • the removal of material from the outside and inside of the workpiece 4 is known over time as a function of the forces exerted axially on the workpiece 4 and other parameters (grinding wheel material, workpiece material, speed of the grinding wheels).
  • the grinding wheel removal of the outer and inner grinding wheels 1, 5 is also known.
  • the feed drives for moving the outer grinding wheel 1, the inner grinding wheel 5 and the regulating wheel 2 can be controlled electronically independently of one another.
  • the inner grinding wheel 5 when grinding, the inner grinding wheel 5 is moved in and out by means of its feed drive along its axis of rotation running parallel to the axis of rotation of the workpiece 4 (which is used as a reference axis), the outer grinding wheel 1 and the regulating wheel 2 each being perpendicular to the by means of their feed drive
  • the axis of rotation of the workpiece 4 is retracted horizontally to such an extent that the respective material removal from the outside and inside of the workpiece 4 and the respective grinding wheel removal from the outside and inside grinding disks 1, 5 are compensated for at any time with respect to the reference axis.
  • the required dimensional adjustment of the inner grinding wheel 5 is advantageously offset against the feeds of the outer grinding wheel 1 and the regulating wheel 2.
  • a simple internal grinding spindle that can be moved in one direction is therefore sufficient.
  • other axes for example, axes that are not parallel to the axis of rotation of the workpiece 4) can also be used as the reference axis.
  • FIG. 2 shows a top view of a grinding machine according to the invention. Corresponding parts are identified by the same reference numerals as in FIG. 1.
  • the driven inner grinding wheel 5 is connected to the inner grinding spindle 6 and rotatable about the axis 9.
  • the inner grinding wheel 5 can be moved into and out of one of the open ends of the workpiece 4 by means of a controllable feed drive (not shown) in the direction of its axis of rotation 9.
  • a second, driven internal grinding wheel 7 is connected to the internal grinding spindle 8 and rotatable about the axis 10. It is used for simultaneous internal grinding of the other end of the workpiece 4.
  • the inner grinding wheel 7 can also be moved in and out of one of the open ends of the workpiece 4 by means of a controllable feed drive (not shown) in the direction of its axis of rotation 10.
  • the second inner grinding wheel 7 is advantageously moved in and out along its axis 10 running parallel to the axis of rotation 11 of the workpiece 4 and retracted or extended horizontally to the extent perpendicular to the axis of rotation 11 of the workpiece 4 so that the respective difference in the grinding wheel abrasion of the inner grinding wheel 5 and the second inner grinding wheel 7 is compensated at any time with respect to the axis 9, which is used as the reference axis.
  • the second internal grinding spindle 8 can be arranged on a cross slide. A simple internal grinding spindle 6 that can be moved in a single direction is therefore also sufficient in this embodiment.
  • the inner grinding wheels 5 and 7 can be in other, not parallel to the axis of rotation 11 directions of the workpiece 4 are moved into and out of the workpiece 4.
  • one or more internal grinding wheel (s) are used at the same time for internal grinding of the two ends of the workpiece 4. For this purpose, they are moved parallel and independently of one another into and out of one of the two open ends of the workpiece 4.
  • the further internal grinding spindles can be arranged on respective cross slides.
  • one or more internal grinding wheel (s) are used in succession for internal grinding of the two ends of the workpiece 4.
  • the other internal grinding spindles can be arranged on respective cross slides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP95108493A 1994-06-14 1995-06-02 Procédé de rectification cylindrique sans centre d'une pièce ainsi que rectifieuse pour la mise en oeuvre de ce procédé Withdrawn EP0687523A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1874/94 1994-06-14
CH187494 1994-06-14

Publications (1)

Publication Number Publication Date
EP0687523A1 true EP0687523A1 (fr) 1995-12-20

Family

ID=4220619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95108493A Withdrawn EP0687523A1 (fr) 1994-06-14 1995-06-02 Procédé de rectification cylindrique sans centre d'une pièce ainsi que rectifieuse pour la mise en oeuvre de ce procédé

Country Status (1)

Country Link
EP (1) EP0687523A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106944888A (zh) * 2017-02-23 2017-07-14 常熟市双月机械有限公司 一种高精度内外圆加工磨床
CN118559524A (zh) * 2024-07-22 2024-08-30 宁波韩高液压有限公司 超精细自动进出料无心磨床

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772932A (en) * 1927-05-23 1930-08-12 Cincinnati Grinders Inc Grinding machinery
GB2017545A (en) * 1978-03-22 1979-10-10 Ntn Toyo Bearing Co Ltd Method of controlling infeed in compound grinding
GB2105228A (en) * 1981-09-10 1983-03-23 Clichy Const Sa A machine for simultaneous internal and external grinding of a workpiece to be machined
US4497138A (en) 1980-11-05 1985-02-05 Buderus Aktiengesellschaft Apparatus for simultaneously grinding inner and outer workpiece surfaces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772932A (en) * 1927-05-23 1930-08-12 Cincinnati Grinders Inc Grinding machinery
GB2017545A (en) * 1978-03-22 1979-10-10 Ntn Toyo Bearing Co Ltd Method of controlling infeed in compound grinding
US4497138A (en) 1980-11-05 1985-02-05 Buderus Aktiengesellschaft Apparatus for simultaneously grinding inner and outer workpiece surfaces
GB2105228A (en) * 1981-09-10 1983-03-23 Clichy Const Sa A machine for simultaneous internal and external grinding of a workpiece to be machined

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YU.M. ERMAKOV ET AL.: "Centreless grinding of rings on fixed supports", MACHINES & TOOLING, vol. 45, no. 5, pages 51 - 53, XP000654740 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106944888A (zh) * 2017-02-23 2017-07-14 常熟市双月机械有限公司 一种高精度内外圆加工磨床
CN106944888B (zh) * 2017-02-23 2019-01-18 常熟市双月机械有限公司 一种高精度内外圆加工磨床
CN118559524A (zh) * 2024-07-22 2024-08-30 宁波韩高液压有限公司 超精细自动进出料无心磨床

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