EP0738197A1 - Grinding method and apparatus - Google Patents

Grinding method and apparatus

Info

Publication number
EP0738197A1
EP0738197A1 EP94904232A EP94904232A EP0738197A1 EP 0738197 A1 EP0738197 A1 EP 0738197A1 EP 94904232 A EP94904232 A EP 94904232A EP 94904232 A EP94904232 A EP 94904232A EP 0738197 A1 EP0738197 A1 EP 0738197A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
grinding
grinding wheel
speed
feed
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
EP94904232A
Other languages
German (de)
French (fr)
Other versions
EP0738197B1 (en
Inventor
Geoffrey Ian Smith
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.)
Intermec Europe Ltd
Original Assignee
Western Atlas UK 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 Western Atlas UK Ltd filed Critical Western Atlas UK Ltd
Publication of EP0738197A1 publication Critical patent/EP0738197A1/en
Application granted granted Critical
Publication of EP0738197B1 publication Critical patent/EP0738197B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • 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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping

Definitions

  • This invention relates to a method of grinding a workpiece having a cylindrical surface and to apparatus for carrying out said method.
  • chatter-marks can be reduced by absolute truing of the grinding wheel, but this is time consuming and expensive, especially when the grinding surface is a super-abrasive such as diamond or CBN.
  • a method of grinding- a cylindrical workpiece surface in which the speed of rotation of the grinding wheel and/or the speed of rotation of the workpiece is changed one or more times during the final stage of grinding, the period of such rotational speed variation including at least part of the final dwell period in which sizing occurs, thereby to reduce chatter-marks on the workpiece.
  • apparatus for grinding a cylindrical workpiece surface comprising a grinding machine having a grinding wheel, a grinding wheel feed, a grinding wheel feed controller, means for rotating the grinding wheel, a workpiece support and means for rotating the workpiece, a speed of rotation controller for the grinding wheel and for the workpiece, and means whereby, during the final stage of grinding extending into the final dwell period in which sizing occurs, the speed of rotation of the grinding wheel and/or the workpiece is changed one or more times in order to reduce chatter-marks on the workpiece.
  • the method and apparatus of the invention may be applied to internal as well as external grinding.
  • the speed variation effected is not dependent on vibration sensing of the grinding wheel or the workpiece.
  • the rotational speed variation is preferably practised by rotational speed change which includes one or more changes in the rotational speed of the workpiece.
  • any change made will usually be decelerative.
  • the rotational speed of the grinding wheel is kept constant.
  • the one or more rotational speed changes may be initiated either after a predetermined number of rotations of the workpiece where the number of turns per grinding cycle is controlled and/or at a predetermined feed distance before the feed position for final sizing, as indicated in more detail below.
  • the speed variations effected may therefore be linear, reduce or increase at a rate relative to the above variables, or be of other controlled forms such as sinusoidal.
  • the speed change is normally initiated during the slow approach to size feed and always extends into the final dwell period in which sizing occurs .
  • Figure 1 is a graph showing the feed of the grinding wheel in terms of workpiece distance v time.
  • Figure 2 is a much simplified diagram of a grinding machine .
  • Figure 1 is a typical feed diagram for the grinding wheel in a grinding process for grinding a cylindrical workpiece.
  • the grinding wheel feed includes a fine feed period 10 immediately prior to a stationary final dwell period 12 (size dwell) in which sizing occurs.
  • a change in the rotational speed of the workpiece is initiated in the fine feed period, and this speed change or one or more further speed changes is extended into at least part of the final dwell period 12.
  • the means 22 is preferably constituted by a servo- controller, which automatically initiates one or more changes in the workspeed at the aforesaid time and for the aforesaid period, for example dependently on the feed position, the number of turns of the workpiece in the grinding cycle, and/or component size.
  • the or each change effected is preferably not sudden, but is a relatively slow change which may be linear, sinusoidal or of any other desired form.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

In a grinding machine for cylindrical workpieces in which the workpiece (18) is rotated against a rotating grinding wheel (14), means (22) is provided for changing the speed of rotation of the workpiece and/or of the grinding wheel during the final stage of grinding. The speed change may comprise a deceleration of the grinding wheel, or a linear or sinusoidal reduction or increase in the workpiece speed, thereby reducing chatter-marks on the workpiece.

Description

Title Grinding Method and Apparatus
Field of the invention
This invention relates to a method of grinding a workpiece having a cylindrical surface and to apparatus for carrying out said method.
Background to the invention
It is well known that, when a cylindrical workpiece is being ground, the grinding process produces vibrations which generate lobes on the workpiece surface. This phenomenon is commonly known as chattering, and the resulting distortions on the workpiece are known as chatter-marks.
To some extent chatter-marks can be reduced by absolute truing of the grinding wheel, but this is time consuming and expensive, especially when the grinding surface is a super-abrasive such as diamond or CBN.
It is an object of the present invention to provide a method of and apparatus for reducing the tendency for generation of chatter-marks during grinding.
The invention
According to one aspect of the invention, there is provided a method of grinding- a cylindrical workpiece surface in which the speed of rotation of the grinding wheel and/or the speed of rotation of the workpiece is changed one or more times during the final stage of grinding, the period of such rotational speed variation including at least part of the final dwell period in which sizing occurs, thereby to reduce chatter-marks on the workpiece.
According to another aspect of the invention, there is provided apparatus for grinding a cylindrical workpiece surface comprising a grinding machine having a grinding wheel, a grinding wheel feed, a grinding wheel feed controller, means for rotating the grinding wheel, a workpiece support and means for rotating the workpiece, a speed of rotation controller for the grinding wheel and for the workpiece, and means whereby, during the final stage of grinding extending into the final dwell period in which sizing occurs, the speed of rotation of the grinding wheel and/or the workpiece is changed one or more times in order to reduce chatter-marks on the workpiece.
The method and apparatus of the invention may be applied to internal as well as external grinding.
Moreover, it is to be noted that the speed variation effected is not dependent on vibration sensing of the grinding wheel or the workpiece.
The rotational speed variation is preferably practised by rotational speed change which includes one or more changes in the rotational speed of the workpiece.
If the speed variation includes change in the rotational speed of the grinding wheel, any change made will usually be decelerative. Preferably, however, the rotational speed of the grinding wheel is kept constant.
The one or more rotational speed changes may be initiated either after a predetermined number of rotations of the workpiece where the number of turns per grinding cycle is controlled and/or at a predetermined feed distance before the feed position for final sizing, as indicated in more detail below.
Thus, the possibilities for workspeed variation are limitless if its rotational speed is servo-controlled relative to time, grinding wheel feed position, component size and/or number of component turns.
The speed variations effected may therefore be linear, reduce or increase at a rate relative to the above variables, or be of other controlled forms such as sinusoidal. However, the speed change is normally initiated during the slow approach to size feed and always extends into the final dwell period in which sizing occurs .
Description of embodiment
The practical implementation of the method and apparatus of the invention is exemplified with reference to the accompanying drawings, in which:-
Figure 1 is a graph showing the feed of the grinding wheel in terms of workpiece distance v time; and
Figure 2 is a much simplified diagram of a grinding machine . Figure 1 is a typical feed diagram for the grinding wheel in a grinding process for grinding a cylindrical workpiece.
The grinding wheel feed includes a fine feed period 10 immediately prior to a stationary final dwell period 12 (size dwell) in which sizing occurs.
In accordance with the invention, a change in the rotational speed of the workpiece is initiated in the fine feed period, and this speed change or one or more further speed changes is extended into at least part of the final dwell period 12.
In the simplified grinding machine shown in Figure 2, wherein the grinding wheel is referenced 14, the wheel feed indicated at 16, the workpiece at 18 and the workpiece support at 20, a means 22 is incorporated for changing the rotational speed of the workpiece 18, as aforesaid.
The means 22 is preferably constituted by a servo- controller, which automatically initiates one or more changes in the workspeed at the aforesaid time and for the aforesaid period, for example dependently on the feed position, the number of turns of the workpiece in the grinding cycle, and/or component size.
The or each change effected is preferably not sudden, but is a relatively slow change which may be linear, sinusoidal or of any other desired form.

Claims

Claims :
1. A method of grinding a cylindrical workpiece surface in which the speed of rotation of the grinding wheel and/or the speed of rotation of the workpiece is changed one or more times during the final stage of grinding, the period of such rotational speed variation including at least part of the final dwell period in which sizing occurs, thereby to reduce chatter-marks on the workpiece.
2. Apparatus for grinding a cylindrical workpiece surface comprising a grinding machine having a grinding wheel, a grinding wheel feed, a grinding wheel feed controller, means for rotating the grinding wheel, a workpiece support and means for rotating the workpiece, a speed of rotation controller for the grinding wheel and/or for the workpiece, and means whereby, during the final stage of grinding extending into the final dwell period in which sizing occurs, the speed of rotation of the grinding wheel and/or the workpiece is changed one or more times in order to reduce chatter-marks on the workpiece.
3. A method according to claim 1 or apparatus according to claim 2 in which the rotational speed change includes one or more changes in the rotational speed of the workpiece.
4. A method or apparatus according to claim 1 or claim 2 in which the speed change is decelerative.
5. A method or apparatus according to any one of claims 1 to 4 in which the speed of the grinding wheel is kept constant .
6. A method or apparatus according to any one of claims 1 to 5 in which one or more rotational speed changes are initiated either after a predetermined number of rotations of the workpiece, where the number of turns per grinding cycle is controlled, and/or at a predetermined feed distance before the feed position for final sizing.
7. A method or apparatus according to any one of claims 1 to 5 in which the rotational speed is servo-controlled relative to time, grinding wheel feed position, component size and/or number of component turns.
8. A method or apparatus according to claim 6 or claim 7 in which the speed variations effected are linear or sinusoidal, and reduce or increase at a rate relative to the said variables.
9. A method or apparatus according to any one preceding claim in which the speed change is initiated during the slow approach to size feed.
10. A method of or apparatus for grinding a cylindrical workpiece substantially as herein described with reference to, and as illustrated in, Figures 1 and 2 of the accompanying drawings.
EP94904232A 1992-07-18 1994-01-13 Grinding method and apparatus Expired - Lifetime EP0738197B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9215349A GB2268895B (en) 1992-07-18 1992-07-18 Grinding method and apparatus
PCT/GB1994/000047 WO1995019241A1 (en) 1992-07-18 1994-01-13 Grinding method and apparatus

Publications (2)

Publication Number Publication Date
EP0738197A1 true EP0738197A1 (en) 1996-10-23
EP0738197B1 EP0738197B1 (en) 1999-10-06

Family

ID=26301281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94904232A Expired - Lifetime EP0738197B1 (en) 1992-07-18 1994-01-13 Grinding method and apparatus

Country Status (6)

Country Link
EP (1) EP0738197B1 (en)
AU (1) AU5837194A (en)
DE (1) DE69421094T2 (en)
ES (1) ES2138068T3 (en)
GB (1) GB2268895B (en)
WO (1) WO1995019241A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108555697A (en) * 2017-11-02 2018-09-21 中国航发哈尔滨东安发动机有限公司 A kind of method for grinding of rotator tip

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2291608B (en) * 1994-07-23 1996-11-06 Western Atlas Uk Ltd Grinding method and apparatus
DE60030790T2 (en) * 1999-10-27 2007-01-11 Cinetic Landis Grinding Ltd. Method for grinding a workpiece with which constant time gap volumes are achieved
JP2023000307A (en) * 2021-06-17 2023-01-04 株式会社ディスコ Grinding apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH595187A5 (en) * 1975-12-20 1978-02-15 Studer Ag Fritz
DE3375464D1 (en) * 1982-12-16 1988-03-03 Centre Rech Tech Ind Fab Metal Method and device for adjusting any work piece by removing material by means of a griding wheel
US4604834A (en) * 1985-10-03 1986-08-12 General Electric Company Method and apparatus for optimizing grinding

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9519241A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108555697A (en) * 2017-11-02 2018-09-21 中国航发哈尔滨东安发动机有限公司 A kind of method for grinding of rotator tip

Also Published As

Publication number Publication date
AU5837194A (en) 1995-08-01
GB2268895B (en) 1995-06-28
GB9215349D0 (en) 1992-09-02
ES2138068T3 (en) 2000-01-01
DE69421094T2 (en) 2000-01-20
WO1995019241A1 (en) 1995-07-20
EP0738197B1 (en) 1999-10-06
GB2268895A (en) 1994-01-26
DE69421094D1 (en) 1999-11-11

Similar Documents

Publication Publication Date Title
EP1473113B1 (en) Workpiece grinding method which achieves a constant stock removal rate
US20200230725A1 (en) Method and Device for Precision Machining of Toothed and Hardened Work Wheels
US5899797A (en) Method and apparatus for grinding cams with concave sides
US4621463A (en) Method of grinding cams on a camshaft
US4343114A (en) Apparatus for machining cams at a constant cutting speed
US4528781A (en) Method of forming cam by grinding
JPH06246601A (en) Grinding method
WO1995019241A1 (en) Grinding method and apparatus
US4866887A (en) Method of truing grinding wheel
EP0771249B1 (en) Grinding method and apparatus
US5228241A (en) Method and machine for grinding
JPH01252358A (en) Control method of grinding process device furnishing spindle device with slack detecting device
GB1570298A (en) Method of grinding and grinding machine for carrying out the method
SU1229023A1 (en) Method of honing to size
JP3130770B2 (en) Non-circular grinding machine
JP2001328067A (en) Grinding method in cylindrical grinding panel
JPH01171743A (en) Grinding method
JPS61252065A (en) Device for controlling grinding
Mason First US High-Efficiency Deep Grinding(HEDG) Machine
JPH06198566A (en) Machining spindle rotating speed control method
JP2004223629A (en) Grinding method
JPH01316153A (en) Machining device
JPS63216659A (en) Metal surface finishing method

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19960301

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR IT

17Q First examination report despatched

Effective date: 19971124

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UNOVA U.K. LIMITED

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR IT

REF Corresponds to:

Ref document number: 69421094

Country of ref document: DE

Date of ref document: 19991111

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2138068

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050117

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20050208

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050228

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060131

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060131

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060801

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060929

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20060114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070113