GB2268895A - Grinding method and apparatus - Google Patents
Grinding method and apparatus Download PDFInfo
- Publication number
- GB2268895A GB2268895A GB9215349A GB9215349A GB2268895A GB 2268895 A GB2268895 A GB 2268895A GB 9215349 A GB9215349 A GB 9215349A GB 9215349 A GB9215349 A GB 9215349A GB 2268895 A GB2268895 A GB 2268895A
- Authority
- GB
- United Kingdom
- 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
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
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. <IMAGE>
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 servocontroller, 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 (10)
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.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9215349A GB2268895B (en) | 1992-07-18 | 1992-07-18 | Grinding method and apparatus |
AU58371/94A AU5837194A (en) | 1992-07-18 | 1994-01-13 | Grinding method and apparatus |
ES94904232T ES2138068T3 (en) | 1992-07-18 | 1994-01-13 | METHOD AND APPARATUS OF GRINDING. |
DE69421094T DE69421094T2 (en) | 1992-07-18 | 1994-01-13 | GRINDING METHOD AND DEVICE |
EP94904232A EP0738197B1 (en) | 1992-07-18 | 1994-01-13 | Grinding method and apparatus |
PCT/GB1994/000047 WO1995019241A1 (en) | 1992-07-18 | 1994-01-13 | Grinding method and apparatus |
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 (3)
Publication Number | Publication Date |
---|---|
GB9215349D0 GB9215349D0 (en) | 1992-09-02 |
GB2268895A true GB2268895A (en) | 1994-01-26 |
GB2268895B GB2268895B (en) | 1995-06-28 |
Family
ID=26301281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9215349A Expired - Fee Related GB2268895B (en) | 1992-07-18 | 1992-07-18 | 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 (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2291608A (en) * | 1994-07-23 | 1996-01-31 | Western Atlas Uk Ltd | Reducing chattering in the grinding of cylindrical surfaces |
GB2357720A (en) * | 1999-10-27 | 2001-07-04 | Unova Uk Ltd | Methods of grinding a crankpin |
US20220402093A1 (en) * | 2021-06-17 | 2022-12-22 | Disco Corporation | Grinding apparatus |
Families Citing this family (1)
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH595187A5 (en) * | 1975-12-20 | 1978-02-15 | Studer Ag Fritz | |
ATE32192T1 (en) * | 1982-12-16 | 1988-02-15 | Centre Rech Tech Ind Fab Metal | METHOD AND DEVICE FOR GRINDING ANY WORKPIECE WITH MATERIAL REMOVAL USING A GRINDING STONE. |
US4604834A (en) * | 1985-10-03 | 1986-08-12 | General Electric Company | Method and apparatus for optimizing grinding |
-
1992
- 1992-07-18 GB GB9215349A patent/GB2268895B/en not_active Expired - Fee Related
-
1994
- 1994-01-13 EP EP94904232A patent/EP0738197B1/en not_active Expired - Lifetime
- 1994-01-13 DE DE69421094T patent/DE69421094T2/en not_active Expired - Fee Related
- 1994-01-13 WO PCT/GB1994/000047 patent/WO1995019241A1/en active IP Right Grant
- 1994-01-13 ES ES94904232T patent/ES2138068T3/en not_active Expired - Lifetime
- 1994-01-13 AU AU58371/94A patent/AU5837194A/en not_active Abandoned
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2291608A (en) * | 1994-07-23 | 1996-01-31 | Western Atlas Uk Ltd | Reducing chattering in the grinding of cylindrical surfaces |
GB2291608B (en) * | 1994-07-23 | 1996-11-06 | Western Atlas Uk Ltd | Grinding method and apparatus |
GB2357720A (en) * | 1999-10-27 | 2001-07-04 | Unova Uk Ltd | Methods of grinding a crankpin |
GB2357720B (en) * | 1999-10-27 | 2003-05-07 | Unova Uk Ltd | Crankpin grinding method |
US20220402093A1 (en) * | 2021-06-17 | 2022-12-22 | Disco Corporation | Grinding apparatus |
US11904432B2 (en) * | 2021-06-17 | 2024-02-20 | Disco Corporation | Grinding apparatus |
Also Published As
Publication number | Publication date |
---|---|
ES2138068T3 (en) | 2000-01-01 |
DE69421094D1 (en) | 1999-11-11 |
WO1995019241A1 (en) | 1995-07-20 |
AU5837194A (en) | 1995-08-01 |
DE69421094T2 (en) | 2000-01-20 |
GB9215349D0 (en) | 1992-09-02 |
EP0738197B1 (en) | 1999-10-06 |
GB2268895B (en) | 1995-06-28 |
EP0738197A1 (en) | 1996-10-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1473113B1 (en) | Workpiece grinding method which achieves a constant stock removal rate | |
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 | |
GB2268895A (en) | Grinding method and apparatus | |
US5384983A (en) | Method and grinding machine for the internal grinding of bores | |
EP0771249B1 (en) | Grinding method and apparatus | |
JP3635724B2 (en) | Angular grinding method and apparatus for centerless grinding machine | |
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 | |
JP2001277082A (en) | Centerless grinding method and grinding device | |
JPH0899257A (en) | Grinding device | |
JPH10156715A (en) | Wheel spindle stock of grinding machine and grinding method using the grinding machine | |
JPS6057995B2 (en) | Shape processing method | |
JPS6161754A (en) | Grinding method using angular grinding wheel | |
JPH06134668A (en) | Grinding machine | |
JP3130770B2 (en) | Non-circular grinding machine | |
EP0515505B1 (en) | A method and grinding machine for the internal grinding of bores | |
JP2001328067A (en) | Grinding method in cylindrical grinding panel | |
JPS61252065A (en) | Device for controlling grinding | |
JPH06198566A (en) | Machining spindle rotating speed control method | |
JPH01316153A (en) | Machining device | |
JP2004223629A (en) | Grinding method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20050718 |