EP1687118B1 - Verbesserungen von schleifmaschinen und diese betreffend - Google Patents

Verbesserungen von schleifmaschinen und diese betreffend Download PDF

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Publication number
EP1687118B1
EP1687118B1 EP04798452A EP04798452A EP1687118B1 EP 1687118 B1 EP1687118 B1 EP 1687118B1 EP 04798452 A EP04798452 A EP 04798452A EP 04798452 A EP04798452 A EP 04798452A EP 1687118 B1 EP1687118 B1 EP 1687118B1
Authority
EP
European Patent Office
Prior art keywords
wheel
wheelhead
axis
workpiece
workholder
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.)
Not-in-force
Application number
EP04798452A
Other languages
English (en)
French (fr)
Other versions
EP1687118A1 (de
Inventor
Granville Grayston
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.)
Cinetic Landis Grinding Ltd
Original Assignee
Cinetic Landis Grinding 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 Cinetic Landis Grinding Ltd filed Critical Cinetic Landis Grinding Ltd
Publication of EP1687118A1 publication Critical patent/EP1687118A1/de
Application granted granted Critical
Publication of EP1687118B1 publication Critical patent/EP1687118B1/de
Not-in-force legal-status Critical Current
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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
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • B24B19/125—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts electrically controlled, e.g. numerically controlled
    • 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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
    • B24B53/053—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels using a rotary dressing tool
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings

Definitions

  • This invention concerns grinding machines and in particular a grinding machine by which flat or profiled surfaces or slots with a flat or profiled bottom surface can be ground.
  • Shaft encoders, position and movement sensors and gauges can provide feedback signals to the computer to allow grinding to be controlled.
  • the present invention seeks to provide an improved grinding machine of the type above described.
  • the present invention is directed to a grinding machine comprising:-
  • control system is programmed to control the rotational movement of the workpiece about the C axis to produce an oscillating rocking motion, and to control the movement of the wheelhead along the X and Z axes, so as to determine how the workpiece is to be ground.
  • control system may be programmed to move the wheelhead along at least one of the X and Z axes to move the wheel into engagement with a wheel-dressing tool, (when a dressable wheel is used).
  • control means is programmed to:
  • the workpiece comprises part of the perimeter of a circular object
  • the latter is positioned in the workholder so as to be rotatable about its central axis and the control means is programmed to :-
  • the part may be one of a plurality of similar circularly spaced apart regions around the periphery of the circular object or one of a plurality of articles circularly spaced around a circular support such as a circular rotatable workholder, and each preferably protrudes radially beyond the periphery thereof.
  • the latter conveniently comprises a chuck fixture having jaws for gripping the articles at circularly spaced apart points therearound.
  • curvature of the surface is to be centred on an axis which is parallel to or coincident with the central axis of rotation of the circular object or support or workholder, only the workholder needs to be oscillated about its central axis.
  • the wheelhead includes a first face on which the grinding wheel is mounted and at least one further face from which at least one further tool such as a further grinding wheel, or a milling or a drilling tool, or any combination thereof, protrudes, and the grinding wheel or the at least one further tool is brought into machining engagement with a workpiece by moving the wheelhead along its Z axis so that when advanced towards the workpiece along the X axis, the grinding wheel or the said further tool will move towards and engage the workpiece.
  • at least one further tool such as a further grinding wheel, or a milling or a drilling tool, or any combination thereof
  • a dressing tool may be provided for dressing the further tool or tools as required and the control system is programmed to move the wheelhead about X or Z axes to engage the or each further tool with the dressing tool.
  • a plurality of dressing tools may be provided at different positions relative to the wheelhead to simplify the movement of the wheelhead to engage the wheel or further tool(s) with the dressing tools.
  • the machine illustrated in Figs 1A-1D comprises a wheelhead 10 carrying a grinding wheel 12 driven about the S-axis (see Fig 1B) by a motor (not shown) within or on the wheelhead 10.
  • the latter is slidable along a linear track (conveniently referred to as the Z-axis) parallel to the axis of rotation 18 of the wheel 12 and denoted by the dotted line 19.
  • a workhead Adjacent to the wheelhead is a workhead generally designated 20, which includes a drive for rotating a workpiece 22 about a parallel axis 24. This is referred to as the C-axis.
  • a workholder 23 is mounted on the workhead 20 and the workholder is rotatable about the C-axis by the workhead drive (not shown)
  • the workpiece 22 shown in Fig 1A is a camshaft for an internal combustion engine and the grinding wheel 12 is set to grind a slot in one end of the shaft. To this end the wheelhead is movable along an orthogonal linear track denoted by the dotted line 25, referred to as the X-axis.
  • X, Z, C and S axes are also denoted in Figs 1B and 1D.
  • Wheel dressing tools are denoted at 26, 28 and 30. Movement of the wheelhead along the X and Z axes allows the wheel to be brought into dressing engagement with one or the other of the wheel dressing tools 28 and 30. Independent movement of the other tool 26 enables it to perform a wheel dressing function.
  • Fig 1B is a view of the machine from above in the direction of arrow B of Fig 1A.
  • Fig 1C is a view of the machine in the direction of arrow C in Fig 1A albeit with the machine rotated through 180° about the axis of the camshaft workpiece.
  • Fig 1D is a side view of the machine of Fig 1A in which the wheel dressing tool 30 has been omitted.
  • the slot (not shown) is formed by plunge grinding into the end face of the camshaft 22.
  • the width of the slot is determined by the width of the wheel 12 and will have parallel sides, but since the wheel is circular, the base of the slot will have a radius of curvature similar to the radius of the wheel. Slots of greater width may be ground by moving the wheel along the Z-axis.
  • the workhead 20 rotates the workholder 23 and the camshaft 22 about the C-axis with an oscillating rocking motion at the same time as the wheelhead is advanced and retracted in a similar oscillatory motion along the X-axis, so that the locus of the point of contact between the wheel 12 and the workpiece 22 is a straight line denoted by 32 in Fig 1D.
  • the line 32 is orthogonal to the X and Z axes, but if the base of the slot is to be inclined relative to the workpiece axis, so that line 32 would not appear vertical and perpendicular to line 25 (the X-axis) in Fig 1D, but instead would be inclined by an angle of less than 90° to the X-axis, the movement of the wheelhead along the X-axis is adjusted so that the locus of the point of contact between wheel and workpiece describes a straight line such as 34 in Fig 1D.
  • Figs 2A-2D the camshaft workpiece and workholder 22, 23 are replaced by a disc workholder 36 around the periphery of which are mounted a plurality of small similar workpieces, one of which is denoted at 38.
  • the wheel 12 is now replaced by wheel 40 which is to grind the outer face 41 of each workpiece such as 38. Where this is to be a flat surface the wheelhead 10 and workholder 36 are moved as before about the X and C axes so that the line of contact between the wheel and workpiece moves in a flat plane similar to that denoted by line 32 in Fig 1D.
  • Figs 3 and 4 are similar to those in Figs 1 and 2 respectively except that additional machining tools are provided, denoted by 42, 43 and carried by an auxiliary head 45 mounted on the wheelhead 10. Movement of the latter along the Z-axis allows tool 42 or 43 to be aligned with the workpiece and movement along the X-axis allows for machining engagement therebetween.
  • synchronous movement of the wheelhead 10 and workholder 23 or 36 allows a flat surface to be ground by the curved outer surface of the wheel 12, and as mentioned the ground surface may be inclined or perpendicular to an axis of the workpiece.
  • a convexly curved surface is to be ground on the workpiece, the head and workholder are moved relatively in a different manner, so that the locus of the point of contact between wheel and workpiece describes an appropriately curved surface, which will correspond to the final ground surface of the workpiece.
  • a wheel 12 must be chosen whose radius is not greater than R, and is preferably somewhat smaller, and the curved surface is again produced by synchronous relative movement between wheelhead and workholder.
  • Control of the machine including the oscillatory movements along the X-axis and about the C-axis, is preferably achieved using a computer based programmable control system denoted by 46 in each of the Figures.
  • the side faces such as 45 (see Figs 2D and 4D) of a workpiece such as 38 may be ground using the side faces of the wheel 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Disintegrating Or Milling (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Claims (12)

  1. Schleifmaschine, die folgendes umfasst:
    1) eine Basis,
    2) einen Schleifscheibenträger (10) mit Schleifscheibe (12) und Scheibenantrieb, die am Träger montiert sind,
    3) eine Halterung für Werkstücke (23) und eine Antriebsvorrichtung, um ein im Halter eingespanntes Werkstück (22) um mindestens eine Achse zu drehen,
    4) eine Antriebsvorrichtung für den Schleifscheibenträger, um den Schleifscheibenträger (10) bezüglich der Maschinenbasis zu bewegen, und
    5) ein programmierbares, rechnergestütztes Steuersystem, um die Antriebsvorrichtungen unabhängig zu steuern für die Ausführung eines Schleifvorgangs durch Kontakt der Schleifscheibe (12) mit dem Werkstück (22), wobei
    6) der Schleifscheibenträger (10) entlang zweier orthogonaler linearer Achsen X und Z in einer ersten Ebene verschiebbar ist, in der die Bewegung entlang der X-Achse die Schleifscheibe (12) auf den Werkstückhalter (23) hin oder von diesem weg bewegt, und
    7) der Werkstückhalter (23) um eine Achse C drehbar ist, die parallel zur Drehachse (S) der Scheibe ist und sich in der gleichen Ebene wie diese befindet, wobei die gemeinsame Ebene mit der genannten ersten Ebene zusammenfällt oder zu dieser parallel läuft,
    dadurch gekennzeichnet, dass
    8) das Steuersystem so programmiert ist, dass es während des Kontakts zwischen Schleifscheibe (12) und Werkstück (22) die Drehbewegung des Werkstücks (22) um die Achse C steuert, um eine oszillierende Pendelbewegung zu bewirken, und dass es die Bewegung des Schleifscheibenträgers (10) entlang der Achsen X und Z steuert, um so zu bestimmen, wie das Werkstück geschliffen werden soll.
  2. Schleifmaschine nach Anspruch 1, bei der das Steuersystem so programmiert ist, dass nach Vollendung des Schleifvorgangs der Schleifscheibenträger (10) entlang mindestens einer der Achsen X und Z bewegt wird, um die Schleifscheibe (12) in Kontakt mit einem Abrichtwerkzeug (26, 28, 30) für die Schleifscheibe zu bringen.
  3. Schleifmaschine nach Anspruch 1 oder Anspruch 2, die einsetzbar ist, um einen Schlitz in eine Stirnfläche des Werkstücks (22) zu schleifen, wobei das Steuersystem programmiert ist, um:
    1) den Schleifscheibenträger (10) so zu bewegen, dass die Schleifscheibe (12) an der Stirnfläche des Werkstücks (22) angreift, und die Schleifscheibe entlang der Achse X so vorwärts zu bewegen, dass Material aus der Stirnfläche über die Breite der Schleifscheibe entfernt wird, bis die Schleifscheibe in das Werkstück bis zu einer gewünschten Tiefe eingedrungen ist, und anschließend
    2) den Werkstückhalter (23) während des Schleifens so zu bewegen, dass er um die Achse C in oszillierender Weise gedreht wird, und zwar synchron mit einer oszillierenden linearen Bewegung des Schleifscheibenträgers (10) entlang der Achse X, so dass die Bodenfläche des Schlitzes als flache oder gebogene Fläche geschliffen wird.
  4. Schleifmaschine nach Anspruch 1 oder Anspruch 2, bei der das Werkstück einen Teil des Umfangs eines kreisförmigen Objekts umfasst, wobei letzteres im Werkstückhalter (23) so positioniert ist, dass es um seine Mittelachse drehbar ist, und das Steuersystem programmiert ist, um:
    1) den Schleifscheibenträger (10) so zu bewegen, dass die Schleifscheibe (12) an diesem Objekt angreift, um letzteres zu schleifen, und anschließend
    2) den Werkstückhalter (23) und den Schleifscheibenträger (10) während des Schleifvorgangs so zu bewegen, dass der Werkstückhalter um die Achse C gedreht wird und eine oszillierende lineare Bewegung des Schleifscheibenträgers entlang der Achse X bewirkt wird, um eine flache oder gebogene Außenfläche an diesem Objekt zu schleifen.
  5. Schleifmaschine nach einem der vorhergehenden Ansprüche, die außerdem einen kreisförmigen Werkstückhalter (36) umfasst, um den mindestens ein Gegenstand (38) befestigt ist.
  6. Schleifmaschine nach Anspruch 5, bei der der Werkstückhalter (36) eine Einspannvorrichtung umfasst, die an kreisförmig mit Abstand angeordneten Punkten Spannbacken zum Einspannen der Gegenstände hat.
  7. Schleifmaschine nach Anspruch 6, bei der der Werkstückhalter (36) um seine Mittelachse schwingt.
  8. Schleifmaschine nach einem der vorhergehenden Ansprüche, bei der der Schleifscheibenträger (10) eine erste Seite hat, an der die Schleifscheibe befestigt ist, und mindestens eine weitere Seite, an der mindestens ein weiteres Werkzeug (42, 43) hervorsteht.
  9. Schleifmaschine nach Anspruch 8, bei der das weitere Werkzeug (42, 43) eine weitere Schleifscheibe, ein Fräswerkzeug, ein Bohrwerkzeug oder eine Kombination hiervon umfasst.
  10. Schleifmaschine nach Anspruch 8 oder Anspruch 9, bei der die Schleifscheibe (12) oder mindestens ein weiteres Werkzeug (42, 43) zur Bearbeitung in Kontakt gebracht wird mit einem Werkstück (22), indem der Schleifscheibenträger entlang seiner Achse Z so bewegt wird, dass, wenn er entlang der Achse X auf das Werkstück zu vorgeschoben wird, die Schleifscheibe oder das weitere Werkzeug sich auf das Werkstück zu bewegt und an diesem angreift.
  11. Schleifmaschine nach Anspruch 8, 9 oder 10, bei der ein Abrichtwerkzeug vorgesehen ist, um das weitere Werkzeug oder die weiteren Werkzeuge abzurichten, und das Steuersystem so programmiert ist, dass der Schleifscheibenträger (10) um die Achse X oder die Achse Y bewegt wird, um das oder jedes weitere Werkzeug mit dem Abrichtwerkzeug in Kontakt zu bringen.
  12. Schleifmaschine nach Anspruch 8, 9 oder 10, bei der eine Vielzahl von Abrichtwerkzeugen vorgesehen ist, jedes an einer anderen Stelle bezogen auf den Schleifscheibenträger, um die Bewegung des Schleifscheibenträgers zu vereinfachen, wenn er die Schleifscheibe oder weitere(s) Werkzeug(e) mit den Abrichtwerkzeugen in Kontakt bringt.
EP04798452A 2003-11-21 2004-11-08 Verbesserungen von schleifmaschinen und diese betreffend Not-in-force EP1687118B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0327104A GB2408224B (en) 2003-11-21 2003-11-21 Improvements in and relating to grinding machines
PCT/GB2004/004729 WO2005051596A1 (en) 2003-11-21 2004-11-08 Improvements in and relating to grinding machines

Publications (2)

Publication Number Publication Date
EP1687118A1 EP1687118A1 (de) 2006-08-09
EP1687118B1 true EP1687118B1 (de) 2007-05-02

Family

ID=29764204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04798452A Not-in-force EP1687118B1 (de) 2003-11-21 2004-11-08 Verbesserungen von schleifmaschinen und diese betreffend

Country Status (5)

Country Link
EP (1) EP1687118B1 (de)
AT (1) ATE361176T1 (de)
DE (1) DE602004006296T2 (de)
GB (1) GB2408224B (de)
WO (1) WO2005051596A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100436056C (zh) * 2007-03-21 2008-11-26 潘旭华 一种凸轮的磨削方法
CN102689245A (zh) * 2012-06-12 2012-09-26 河南省四达仙龙实业有限公司 一种棒料端头平面磨削机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0801366D0 (en) * 2008-01-25 2008-03-05 Cinetic Landis Grinding Ltd Machine tools and methods of operation thereof
GB2476468B (en) 2009-12-22 2012-08-15 Cinetic Landis Ltd Machine tools and methods of operation thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375670A (en) * 1979-10-29 1983-03-01 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Gesellschaft Mbh Machine tool for machining crankshafts and control system for the machine tool
US4443975A (en) * 1981-01-26 1984-04-24 The Warner & Swasey Company Dual wheel cylindrical grinding center
DE3628977A1 (de) * 1986-08-26 1988-03-03 Buderus Kundenguss Schleifmaschine zum automatischen innenrund-, plan-, aussenrund- und/oder innen- und aussengewindeschleifen
CH684250A5 (de) * 1991-10-17 1994-08-15 Kellenberger & Co Ag L Verfahren zur numerisch steuerbaren Bearbeitung eines Werkstückes an einer Schleifmaschine.
WO1996005940A1 (en) * 1994-08-19 1996-02-29 Western Atlas U.K. Limited Improvements in or relating to grinding machines
JP3787248B2 (ja) * 1999-09-30 2006-06-21 株式会社ジェイテクト 工作機械の定寸加工制御方法及びその装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100436056C (zh) * 2007-03-21 2008-11-26 潘旭华 一种凸轮的磨削方法
CN102689245A (zh) * 2012-06-12 2012-09-26 河南省四达仙龙实业有限公司 一种棒料端头平面磨削机
CN102689245B (zh) * 2012-06-12 2014-03-19 河南省四达仙龙实业有限公司 一种棒料端头平面磨削机

Also Published As

Publication number Publication date
GB0327104D0 (en) 2003-12-24
GB2408224A (en) 2005-05-25
GB2408224B (en) 2005-11-09
DE602004006296T2 (de) 2008-01-10
ATE361176T1 (de) 2007-05-15
EP1687118A1 (de) 2006-08-09
DE602004006296D1 (de) 2007-06-14
WO2005051596A1 (en) 2005-06-09

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