EP0903200A1 - Verbessertes Schleifverfahren - Google Patents

Verbessertes Schleifverfahren Download PDF

Info

Publication number
EP0903200A1
EP0903200A1 EP98307403A EP98307403A EP0903200A1 EP 0903200 A1 EP0903200 A1 EP 0903200A1 EP 98307403 A EP98307403 A EP 98307403A EP 98307403 A EP98307403 A EP 98307403A EP 0903200 A1 EP0903200 A1 EP 0903200A1
Authority
EP
European Patent Office
Prior art keywords
grinding
coolant
workpiece
wheel
flow
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
EP98307403A
Other languages
English (en)
French (fr)
Other versions
EP0903200B1 (de
Inventor
Stuart Clewes
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
Unova 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 Unova UK Ltd filed Critical Unova UK Ltd
Publication of EP0903200A1 publication Critical patent/EP0903200A1/de
Application granted granted Critical
Publication of EP0903200B1 publication Critical patent/EP0903200B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • 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
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents

Definitions

  • This invention concerns grinding machines and grinding methods.
  • CBN wheels in grinding processes has resulted in the requirement for large volumes of coolant to be delivered at ever higher pressures and velocity.
  • CBN wheels tend to have a higher density an lower porosity than conventional Aluminium Oxide wheels. Grinding forces are higher and it is possible that the coolant contributes to the generation of high dynamic forces between the grinding wheel and the workpiece.
  • the grinding process is monitored and during a predetermined final stage of a grind cycle, shortly before final size is reached, the flow of coolant at least onto the region of the workpiece that is being ground, is altered for at least part of the duration of the said predetermined stage of the grind cycle.
  • the method is particularly applicable when grinding with a CBN grinding wheel.
  • a cam lobe profile can be improved and grinding errors in the final size reduced from 10's of microns to 2 or 3 microns during finish grinding, if the coolant flow is reduced or at least in part directed away from the region of engagement during the grinding of the final 20 microns down to final size.
  • the out-of-roundness of a crankpin has been reduced from a 10 micron envelope to an envelope of less than 1 micron, by reducing or deflecting or even removing the high pressure coolant flow when the component was 25 microns above final size, and maintaining the reduced or deflected flow (or turning off the flow) for the duration of the final 25 micron grind.
  • a grinding machine comprises a grinding wheel, drive means for rotating same to effect grinding of a workpiece, means for rotating the latter during grinding, means for effecting relative movement between the grinding wheel and the workpiece to bring the wheel and workpiece into engagement for grinding and to maintain such engagement for the duration of a grinding cycle, means for directing a jet of coolant liquid onto the wheel, or the workpiece, or both, at least in the region of the engagement of the wheel and the workpiece, further comprising: jet controlling means for controlling the direction of the jet and/or the rate of flow of coolant liquid from the jet, means for sensing when a grind cycle is nearing completion and the workpiece has a predetermined oversize condition remaining to be ground, control signal generating means responsive to signals from the sensing means, means for supplying the control signal to the jet controlling means, to alter the jet of coolant liquid so as to deflect it or redirect, it or reduce it, or shut it down completely, when the predetermined oversize condition is sensed and for at least part of the duration of the remainder of the grind
  • the sensing means may comprise a workpiece engaging probe detecting the dimension of a part of the workpiece which is being ground.
  • the sensing means may comprise means responsive to the advance of the grinding wheel during the grinding cycle, which is programmed to deliver a signal when the grinding wheel has advanced through a given distance thereby indicating that the sad predetermined distance remains during which coolant flow is to be altered.
  • the coolant flow control may be achieved by signals from the computer.
  • FIG. 1 there is shown part of a grinding machine including a CBN grinding wheel 10 rotating clockwise, as indicated by the arrow.
  • the wheel is shown in grinding contact with a contra-rotating cylindrical workpiece 12, in this case a crankpin rotating about the main axis of a crankshaft (not shown).
  • the wheel In order for the wheel to follow the orbiting movement of the crankpin 12, the wheel is horizontally backwards and forwards under computer control by means known per se.
  • a coolant nozzle 14 feeds a jet of coolant liquid down into the zone of contact between the wheel and the crankpin.
  • the nozzle is mounted on a wheelhead (not shown) on which the wheel 12 itself is rotatably mounted.
  • Figure 2 shows the control circuit for the coolant, in which a pump (not shown) feeds coolant under pressure along a supply line 16 to a solenoid operated selector valve 18 which, in this example, is under the control of the computer.
  • the selector valve has two positions, a first normal position (as shown) in which a full flow of coolant passes through it, and is fed via line 19 to the nozzle 14, and a second position in which the flow is throttled so that a reduced flow is fed to the nozzle.
  • the reduced flow can be adjusted by a flow control valve 20 which connects the pump to the selector valve 18 along a line 21 parallel to the line 16.
  • FIG. 3 A typical cycle of grinding feed against time is shown in Figure 3.
  • the feed rate progressively reduces from an initial fast feed 22 and a medium feed 24 down to a slow feed 26, after which there is a dwell period 28 in which the feed ceases and sizing of the workpiece occurs, in this case the crankpin 12.
  • the coolant flow is maintained at a full rate 30 during the fast feed and up to the end of the slow feed 26, whereupon the computer issues a command signal to the selector valve 18 to cut the flow down to a reduced rate 32 for the duration of the dwell period 28.
  • the coolant flow is completely stopped while the grinding wheel executes a rapid retract, as shown at 34 in Figure 3.
  • Adjustment of the control valve 20 enables the ratio of the full flow to reduced flow to be varied to cater for differing conditions.
  • crankshaft Since the crankshaft is not uniformly stiff when subjected to side forces, there is a tendency for different amounts of material to be ground away in different planes, causing the crankpin to be ground to a non-round shape. Reducing the flow rate 32 during the final stage of grinding reduces the coolant pressure at the nozzle 14, and hence the force on the crankpin (when grinding forces are low already), and it has been found that the out-of-roundness of the crankpin can be reduced from approximately 10 microns to less than 1 micron, in terms of its true diameter. Thus, the invention enables a higher accuracy and truer grinding profile to be achieved than previously.
  • the coolant could be directed away from the wheel during the final grinding stage.
  • this alternative would be more complicated and less practical than reducing the flow rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP19980307403 1997-09-20 1998-09-14 Verbessertes Schleifverfahren und Vorrichtung Expired - Lifetime EP0903200B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9719969.9A GB9719969D0 (en) 1997-09-20 1997-09-20 Improved grinding process
GB9719969 1997-09-20

Publications (2)

Publication Number Publication Date
EP0903200A1 true EP0903200A1 (de) 1999-03-24
EP0903200B1 EP0903200B1 (de) 2004-04-21

Family

ID=10819346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980307403 Expired - Lifetime EP0903200B1 (de) 1997-09-20 1998-09-14 Verbessertes Schleifverfahren und Vorrichtung

Country Status (4)

Country Link
EP (1) EP0903200B1 (de)
DE (1) DE69823293T2 (de)
ES (1) ES2219847T3 (de)
GB (2) GB9719969D0 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030534A2 (en) * 1999-10-27 2001-05-03 Unova U.K. Limited Constant spindle power grinding method
GB2391188A (en) * 2002-07-30 2004-02-04 Raysun Innovative Design Ltd Grinding apparatus and method with coolant supply
FR2949368A1 (fr) * 2009-08-28 2011-03-04 Essilor Int Dispositif et procede d'usinage de lentilles ophtalmiques
JP2014024122A (ja) * 2012-07-24 2014-02-06 Jtekt Corp 研削盤および研削方法
JP2015116652A (ja) * 2013-12-20 2015-06-25 株式会社ジェイテクト 研削盤および研削方法
JP2019076962A (ja) * 2017-10-20 2019-05-23 株式会社ジェイテクト 研削盤及び研削方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2394767A1 (de) 2010-06-10 2011-12-14 Siemens Aktiengesellschaft Durchflusskühlmitteladapter zur Verwendung in hohlen Spindelmaschinenwerkzeugen
WO2015103008A1 (en) 2013-12-31 2015-07-09 Saint-Gobain Abrasives, Inc. Coolant delivery system for grinding applications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561218A (en) * 1985-02-08 1985-12-31 Ex-Cell-O Corporation Close tolerance internal grinding using coolant mist
DE4133754A1 (de) * 1990-10-12 1992-04-16 Mitsubishi Heavy Ind Ltd Verfahren und vorrichtung zum steuern von werkzeugmaschinen
WO1998009772A1 (en) * 1996-09-03 1998-03-12 Unova Industrial Automation Systems, Inc. Variable volume coolant system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752684B1 (de) * 1968-07-02 1971-07-15 Lindner Gmbh Herbert Kuehlvorrichtung an Gewindeschleifmaschinen
GB1546590A (en) * 1976-12-01 1979-05-23 Henderson Diamond Tool Co Ltd Method and means of cooling in grinding operations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561218A (en) * 1985-02-08 1985-12-31 Ex-Cell-O Corporation Close tolerance internal grinding using coolant mist
DE4133754A1 (de) * 1990-10-12 1992-04-16 Mitsubishi Heavy Ind Ltd Verfahren und vorrichtung zum steuern von werkzeugmaschinen
WO1998009772A1 (en) * 1996-09-03 1998-03-12 Unova Industrial Automation Systems, Inc. Variable volume coolant system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030534A2 (en) * 1999-10-27 2001-05-03 Unova U.K. Limited Constant spindle power grinding method
WO2001030536A1 (en) * 1999-10-27 2001-05-03 Unova U.K. Limited Crankpin grinding method
WO2001030534A3 (en) * 1999-10-27 2002-05-10 Unova Uk Ltd Constant spindle power grinding method
US6767273B1 (en) * 1999-10-27 2004-07-27 Unova Uk Limited Crankpin grinding method
GB2391188A (en) * 2002-07-30 2004-02-04 Raysun Innovative Design Ltd Grinding apparatus and method with coolant supply
GB2391188B (en) * 2002-07-30 2005-08-03 Raysun Innovative Design Ltd Method and apparatus for grinding
FR2949368A1 (fr) * 2009-08-28 2011-03-04 Essilor Int Dispositif et procede d'usinage de lentilles ophtalmiques
JP2014024122A (ja) * 2012-07-24 2014-02-06 Jtekt Corp 研削盤および研削方法
JP2015116652A (ja) * 2013-12-20 2015-06-25 株式会社ジェイテクト 研削盤および研削方法
JP2019076962A (ja) * 2017-10-20 2019-05-23 株式会社ジェイテクト 研削盤及び研削方法

Also Published As

Publication number Publication date
EP0903200B1 (de) 2004-04-21
DE69823293T2 (de) 2005-05-04
GB9719969D0 (en) 1997-11-19
GB2329350A (en) 1999-03-24
GB2329350B (en) 2002-09-11
GB9819802D0 (en) 1998-11-04
ES2219847T3 (es) 2004-12-01
DE69823293D1 (de) 2004-05-27

Similar Documents

Publication Publication Date Title
US6767273B1 (en) Crankpin grinding method
CA2225962C (en) Method and apparatus for grinding composite workpieces
EP0903200B1 (de) Verbessertes Schleifverfahren und Vorrichtung
US5072550A (en) Grinding method and grinding machine with controlled grinding force
KR970009143B1 (ko) 슬라이싱머신의 절단방법
US6283837B1 (en) Grinding machine
US20130058730A1 (en) Device and method for machining a cylinder bore by means of a geometrically defined cutter and a geometrically undefined cutter
JPS6258870B2 (de)
JP5428626B2 (ja) 研削盤
EP1285726B1 (de) Spitzenloses Schleifverfahren für stabförmiges Werkstück auf spitzenloser Schleifmaschine
EP0363165A2 (de) Vorrichtung zum Gebrauch auf einer Schleif- oder Abrichtmaschine
US4561218A (en) Close tolerance internal grinding using coolant mist
EP0895615B1 (de) Verfahren und vorrichtung zum schleifen von konzentrisch zylindrischen bereichen von werkstücken
US4831787A (en) Honing process
US3344560A (en) Control device
JP3701416B2 (ja) ボールねじ軸の研削加工方法
JPH11254277A (ja) 内面研削装置
CN1657232B (zh) 无心磨削方法和无心磨床
US20050079799A1 (en) Method and apparatus for circular grinding
JPS6119910Y2 (de)
JPH09254011A (ja) 穴形成装置
JP2513342B2 (ja) 研削力制御研削におけるリトラクション研削方法および研削装置
US3641713A (en) Grinding machine
JP2001079761A (ja) 段付き管の外面研磨方法
JP2940435B2 (ja) 研削におけるリトラクション量調整法

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR IT

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19990506

AKX Designation fees paid

Free format text: DE ES FR IT

17Q First examination report despatched

Effective date: 20010307

RTI1 Title (correction)

Free format text: IMPROVED GRINDING PROCESS AND APPARATUS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

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: 69823293

Country of ref document: DE

Date of ref document: 20040527

Kind code of ref document: P

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2219847

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

Effective date: 20050124

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 69823293

Country of ref document: DE

Representative=s name: LOESENBECK UND KOLLEGEN, DE

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

Owner name: FIVE LANDIS LIMITED

Effective date: 20141223

Ref country code: FR

Ref legal event code: CD

Owner name: FIVES LANDIS LIMITED, GB

Effective date: 20141203

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 69823293

Country of ref document: DE

Representative=s name: LOESENBECK UND KOLLEGEN, DE

Effective date: 20141211

Ref country code: DE

Ref legal event code: R081

Ref document number: 69823293

Country of ref document: DE

Owner name: FIVES LANDIS LIMITED, GB

Free format text: FORMER OWNER: CINETIC LANDIS LTD., KEIGHLEY, GB

Effective date: 20141211

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 18

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 19

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

Ref country code: DE

Payment date: 20160921

Year of fee payment: 19

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

Ref country code: FR

Payment date: 20160921

Year of fee payment: 19

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

Ref country code: ES

Payment date: 20160916

Year of fee payment: 19

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

Ref country code: IT

Payment date: 20160922

Year of fee payment: 19

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69823293

Country of ref document: DE

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180531

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: 20180404

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: 20170914

Ref country code: FR

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

Effective date: 20171002

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20181019

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: 20170915