EP0675780B1 - WERKSTÜCKSCHLEIFVORRICHTUNG UND WERKSTüKSCHLEIFVERFAHREN - Google Patents

WERKSTÜCKSCHLEIFVORRICHTUNG UND WERKSTüKSCHLEIFVERFAHREN Download PDF

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Publication number
EP0675780B1
EP0675780B1 EP94902880A EP94902880A EP0675780B1 EP 0675780 B1 EP0675780 B1 EP 0675780B1 EP 94902880 A EP94902880 A EP 94902880A EP 94902880 A EP94902880 A EP 94902880A EP 0675780 B1 EP0675780 B1 EP 0675780B1
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EP
European Patent Office
Prior art keywords
grinding
workpiece
belt
wheel
grinding wheel
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.)
Expired - Lifetime
Application number
EP94902880A
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English (en)
French (fr)
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EP0675780A1 (de
Inventor
Stephen Roger Spring Hill Coverdale
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.)
Intermec Europe Ltd
Original Assignee
Western Atlas UK Ltd
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Filing date
Publication date
Priority claimed from GB929226845A external-priority patent/GB9226845D0/en
Application filed by Western Atlas UK Ltd filed Critical Western Atlas UK Ltd
Publication of EP0675780A1 publication Critical patent/EP0675780A1/de
Application granted granted Critical
Publication of EP0675780B1 publication Critical patent/EP0675780B1/de
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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • 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
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools

Definitions

  • This invention relates to improvements in or relating to workpiece grinding method and apparatus.
  • GB-A-481 722 there is disclosed a method of grinding such a cam, in which the concave or re-entrant portion is separately ground by a grinding wheel of small diameter or by a wheel having the required profile, while the remaining portion is ground by a wheel of larger radius.
  • a disadvantage of this method is that there may be formed discontinuities in the cam profile at each side of the re-entrant portion.
  • a method of grinding the periphery of a workpiece having a re-entrant region of relatively small radius characterised by the steps of:
  • modified profile is meant an approximation to the final profile to be obtained by grinding, so that a minimum of stock is left on non-re-entrant parts of the profile but proportionately more stock is left in regions of re-entrant parts of the profile, since the large diameter wheel prevents its entry into the re-entrant parts.
  • the abrasive belt is employed in accordance with the invention to remove the remaining stock from the parts of the workpiece having the modified profile including the stock in any re-entrant part of the profile which cannot be removed by the large diameter grinding wheel.
  • a conventional grinding machine for grinding a workpiece such as a camshaft by a grinding wheel
  • the workpiece is mounted between a headstock and a footstock which define a grinding station.
  • the headstock and/or footstock also rotate the workpiece in a conventional and controlled manner about an axis through the workpiece.
  • the cam profile therefore does not describe a circular path.
  • a wheelhead mounts the grinding wheel and a wheelhead feed therefor produces a reciprocating motion of the wheel to provide an action which puts the grinding wheel in the correct position during the rotation of each section of the workpiece profile being ground, to thereby generate the desired profile therearound, and finally to remove the grinding wheel therefrom.
  • the profile is reduced in size in a controlled manner towards its finished size.
  • the belt is similarly advanced and retracted in a reciprocal manner, with an overall feed, to finish the workpiece as required.
  • apparatus for performing the aforesaid method comprising a grinding station with a grinding wheel to grind the periphery of a workpiece having a re-entrant region of relatively small radius, the grinding wheel having a radius greater than that of the final radius to be obtained in the re-entrant region, characterised in that the grinding wheel is arranged to rough grind the whole periphery to form a modified profile which is an approximation to the final profile, and in that there is associated with the grinding wheel an abrasive belt grinding facility having a guide shoe around which the belt passes and the radius of which is no greater than that of the final radius to be obtained in the re-entrant region, belt drive means and actuating means to move the belt into engagement with the workpiece to finish grind the modified profile to the final profile whilst the workpiece is still within the grinding station.
  • the belt grinding facility may be mounted for advance and retraction to engage and disengage the workpiece along the same axis as the grinding wheel moves to engage and disengage the workpiece at the grinding station. Alternatively it may move along a different axis from that of the grinding wheel, but which is laterally spaced from the wheel. Alternatively it may move in the same plane as the wheel, along a line which passes through the axis of workpiece station but is angled relative to the axis along which the wheel moves.
  • the headstock and footstock may be mounted on a carriage which is movable relative to the grinding wheel and belt, to present different axially spaced regions of a workpiece in succession to the grinding station, so that the whole workpiece may be finished by way of a succession of separate wheel and belt grindings in the same machine.
  • a sequence of grinding in accordance with the invention comprises rough grinding consecutively all the cam shaft lobes on a workpiece using the grinding wheel to produce modified cam profiles at each cam position, indexing the wheelhead through the appropriate angle to present the abrasive belt to the workpiece, and finish grinding consecutively all the modified profiles along the camshaft to the required size and shape.
  • the finished component can be unloaded and a new workpiece put in place whilst the wheelhead indexes so as to present the grinding wheel at the start of the next workpiece grinding sequence as described above.
  • the belt and wheel are separately movable towards and away from the workpiece so that when the abrasive belt is grinding, the grinding wheel is clear of the workpiece, and when the grinding wheel is to be engaged, the abrasive belt is retracted so that it does not make contact with the workpiece.
  • the grinding sequence typically involves rough grinding a component using the grinding wheel, and then finish grinding the same part of the component using the abrasive belt, before the wheelhead assembly is moved to the next region of the component to be ground.
  • the abrasive belt is adapted to engage the workpiece to finish grind a modified profile whilst the grinding wheel is actively rough grinding another axially spaced region of the workpiece. In this way, a workpiece can be finish ground in virtually the same time as would be required to rough grind it prior to a finish grinding sequence.
  • Figure 1a shows a section of a grinding wheel 10, rotating in the direction of arrow 22 about an axis of rotation (not shown) and reciprocably in the direction of arrows 13 to move wheel 10 and its grinding surface towards and away from a cam lobe 14 to be ground.
  • the surface of wheel 10 engages the surface of lobe 14 at an imaginary plane 12 diametrically passing through the axis of rotation of wheel 10 and the base circle axis of lobe 14 at a variable point 24 of cam lobe 14.
  • Lobe 14 is rotating in a controlled manner around an axis 18 in the direction of arrow 16.
  • the cam lobe 14 has a modified profile 20 which remains after the rough grinding step. Cam lobe 14 is rotated about axis 18 to facilitate its grinding. The controlled angular rotation of the cam lobe 14 is complemented by a controlled reciprocal movement of the grinding wheel in the direction of arrow 13 so that it is in the correct position relative to the angle position of the cam lobe.
  • Figure 1b shows a section of an abrasive belt 26 moving in direction of arrow 28 over cylindrically curved shoe face 30 of fixed guide shoe 32.
  • the fixed shoe may be replaced by a roller 33 driven by passage of the abrasive belt over its periphery.
  • the belt assembly is selectably securable along axis 34, in the direction of the arrow 36.
  • Belt 26 and its grinding surface is also movable in the direction of arrow 36 to move its grinding surface towards and away from the surface of the cam lobe 40 to be ground.
  • FIG. 2 shows an elevation 46 and plan view 48 of a dual purpose grinding machine wherein a grinding wheel 50 is conventionally mounted on a spindle (not shown) which rotates in the direction of arrow 51 in a wheel housing 52 about an axis 54 and is driven by a drive motor 56.
  • the grinding surface of grinding wheel 50 is in contact with the surface of a cam lobe 58 of a cam shaft 60, which is fixed between a headstock 64 and a footstock 62.
  • Headstock 64 rotates cam shaft 60 in a conventionally controlled manner about an axis 66 and is in turn driven by an electric motor (not shown) housed in headstock 64.
  • An approximate cam profile can thus be produced by advancing the grinding wheel surface towards cam lobe 50 until the approximate cam profile is achieved.
  • Footstock 62 is slidable and securable along axis 66 in the directions indicated by arrow 68.
  • Adjacent to the headstock 64 is a conventional truing or dressing device 70 which is manoeuvred by sliding headstock 64 across the face of grinding wheel 50 or belt 72 with device 70 in contact therewith for truing the grinding wheel 50 or abrasive belt 72 prior to use.
  • headstock 64 is slid back and secured so as to secure workpiece 60 in position, so that truing device 70 is free of the grinding wheel 50 and belt 72.
  • a wheelhead 92 also incorporates the abrasive belt assembly 76 which includes the belt 72. Conventional rotational indexing of the wheelhead through 180° about an axis 108 presents abrasive belt 72 instead of wheel 50 to workpiece 60.
  • Wheelhead 92 is mounted on an underslide 106 which supports and guides wheelhead 92 for rotation about axis 108, so that wheelhead 92 can be rotatably indexed and rigidly locked (by locking means not shown) when in either grinding position.
  • Wheelhead 92 is mounted on underslide 106 and driven backwards and forwards on slide 134 by a feed member 107 so that the abrasive belt 72 or grinding wheel 50 can be advanced or withdrawn from the workpiece as required at the beginning and ending of a grinding step and reciprocated so as to respond to the changing component profile during rotation of the latter and to readjust position for the next workpiece.
  • Slide 134 is conventionally supported on the machine tool base 136.
  • FIG 3 shows the grinding machine of Figure 2 with the abrasive belt in contact with the cam lobe.
  • the belt mechanism comprises an abrasion belt tensioning pulley 78 attached by means of arm 80 to a securing member 84.
  • the arms are attached to the securing member by means by pivot bearings 81, and to the body of the wheelhead 92 by means of a pneumatic cylinder 200.
  • the pneumatic cylinder is retractable allowing the arm to swing down for fitting new belts.
  • the pneumatic cylinder can then be extended at a controlled rate and pressure to correctly tension the abrasive belt 72.
  • the abrasive belt is driven around a larger pulley 86 which is rotated by a belt drive 90 via drive motor 88.
  • the larger pulley 86 is carried by the securing member 84 and the abrasive belt drive motor 88 is secured to the body of the wheelhead 92 via a vibration absorbing platform 94.
  • the abrasive belt 72 also passes around two belt guide pulleys 96 and 98 which are also carried by securing member 100 so that they are equidistant from the guide shoe 102 and shoe supporting grooved member 104.
  • the guide pulleys are located behind the guide shoe 102 so that the belt passing over the guide shoe protrudes forward of the guide mechanism enabling grinding of the workpiece 105 by the abrasive belt.
  • Figure 4 shows plan 112 and elevation 114 of an embodiment of the machine wherein the abrasive belt mechanism and grinding wheel mechanism are adjacent to each other and wherein the abrasive belt extends forwardly of the abrasive wheel when the abrasive belt supporting grooved arm 116 has been lowered into the position shown in Figure 4(a).
  • Alternation between abrasive mechanisms is by retraction of the abrasive belt shoe by rotation of supporting arm 116 around axis 118, so that the abrasive belt mechanism is now displaced behind the grinding wheel surface when viewed from the side.
  • rotation of the arm 116 allows alternative abrasive wheel rough grinding and abrasive belt finish grinding operations, without the non grinding device interfering with the workpiece while the other is active.
  • the abrasive belt 120 and the abrasive wheel 122 are located on separate wheelheads 124 and 126 on either side of the machine tool mounting 128. Both wheelheads are slidable over respective support members 130 and 132 and the abrasion mechanism is essentially as hereinbefore described except that in this embodiment it is possible to grind a workpiece from both sides.
  • one part of the grinding wheel 122 is retracted and the abrasive belt 120 is advanced and engaged for finish grinding the same part, before the workpiece is axially advanced, to present another region for rough grinding.

Claims (13)

  1. Verfahren zum Schleifen der Umfangsfläche eines Werkstückes (14) mit einem einspringenden Bereich mit relativ kleinem Radius, dadurch gekennzeichnet, daß
    (a) die gesamte Umfangsfläche grob geschliffen wird, um ein modifiziertes Profil (20) auszubilden, das eine Annäherung an das gewünschte Endprofil darstellt, wobei eine Schleifscheibe (10) mit einem Radius verwendet wird, der größer ist als der des einspringenden Bereiches der Umfangsfläche, und
    (b) das modifizierte Profil einschließlich des einspringenden Bereiches mit Hilfe eines Schleifbandes (26) ohne Entnahme des Werkstückes aus der Maschine fertig geschliffen wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schleifscheibe (10) und das materialabtragende Schleifband (26) gemeinsam befestigt sind, und daß durch den Zwischenschritt, mit dem das Schleifband dem Werkstück zugeordnet ist, die Schleifscheibe von dem Werkstück weg bewegt wird.
  3. Einrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2, mit einer Schleifstation mit einer Schleifscheibe (10) zum Schleifen der Umfangsfläche eines Werkstückes (14) mit einem einspringenden Bereich mit relativ keinem Radius, wobei die Schleifscheibe einen Radius hat, der größer ist als der feste Radius, der in dem einspringenden Bereich erhalten wird, dadurch gekennzeichnet, daß die Schleifscheibe so ausgelegt ist, daß sie den gesamten Umfang grob schleift, um ein modifiziertes Profil (20) auszubilden, das eine Annäherung an das Endprofil darstellt, und daß der Schleifscheibe eine Bandschleifvorrichtung (26) zugeordnet ist, die einen Führungsschuh (32) aufweist, um den das Band läuft, und dessen Radius nicht größer ist als der Endradius, der in dem einspringenden Bereich erhalten wird, wobei Bandantriebsvorrichtung und Betätigungsvorrichtung (16) das Band in Eingriff mit dem Werkstück bewegen, um das modifizierte Profil in das Endprofil fertigzuschleifen, während das Werkstück noch in der Schleifstation ist.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Betätigungsvorrichtung einen Auslegerarm (116) aufweist, der so bewegbar ist, daß er die Bandschleifvorrichtung (26) in Eingriff mit dem Werkstück (Fig. 4) bringt.
  5. Einrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Bandschleifvorrichtung in der Nähe der Schleifscheibe befestigt ist.
  6. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Bandschleifvorrichtung (120) auf der Seite des Werkstückes gegenüber der Schleifscheibe (10) angeordnet ist.
  7. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Spindelstock (64) und der Reitstock (62) auf einem Schiffen befestigt sind, der relativ zur Schleifscheibe und zum Band beweglich ist, damit unterschiedliche Bereiche eines Werkstückes nacheinander der Schleifstation ausgesetzt werden können, und ein gesamtes Werkstück aufgrund einer Folge von getrennten Scheiben- und Band-Schleifvorgängen in der gleichen Maschine fertigbearbeitet werden kann.
  8. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Schleifscheiben-und Schleifbandanordnung beide auf einem drehbaren Schleifkopf (92) befestigt sind, derart, daß durch Drehen des Schleifkopfes entweder die Schleifscheibe oder das Schleifband dem Werkstück dargeboten werden können.
  9. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, daß der Schleifkopf (92) um eine vertikale Achse drehbar ist.
  10. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Schleifkopf (92) über 180° um die vertikale Achse drehbar ist.
  11. Einrichtung nach einem der Ansprüche 3 - 10, dadurch gekennzeichnet, daß die Antriebsvorrichtung elektronisch und/oder durch Mikroprozessor gesteuert ausgelegt ist, um einen Teil der oder alle Geschwindigkeiten, Richtung oder Rotation, Beschleunigung und Verzögerung zu steuern und damit den Schleifvorgang der Scheibe und des Schleifbandes zu beeinflussen.
  12. Einrichtung nach einem der Ansprüche 3, 4, 6 und 8 - 11, dadurch gekennzeichnet, daß das Schleifband längs der Schleifscheibe befestigt ist, und Band und Scheibe zum Werkzeug hin und vom Werkzeug weg getrennt so verschiebbar sind, daß dann, wenn das Schleifband schleift, die Schleifscheibe von dem Werkstück abgehoben ist, und wenn die Schleifscheibe in Eingriff gebracht werden soll, das Schleifband zurückgezogen wird, damit es keinen Kontakt mit dem Werkstück gibt.
  13. Einrichtung nach einem der Ansprüche 3 - 5 und 7, dadurch gegenzeichnet, daß das Schleifband in der Lage ist, das Werkstück zu beaufschlagen, um ein modifiziertes Profil fertig zu schleifen, während die Schleifscheibe aktiv einen anderen, axial versetzten Bereich des Werkstückes grob schleift.
EP94902880A 1992-12-23 1993-12-16 WERKSTÜCKSCHLEIFVORRICHTUNG UND WERKSTüKSCHLEIFVERFAHREN Expired - Lifetime EP0675780B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9226845 1992-12-23
GB929226845A GB9226845D0 (en) 1992-12-23 1992-12-23 Workpiece gringing mechanism
GB9305245 1993-03-15
GB9305245A GB2273899B (en) 1992-12-23 1993-03-15 Workpiece grinding apparatus
PCT/GB1993/002569 WO1994014571A1 (en) 1992-12-23 1993-12-16 Workpiece grinding apparatus

Publications (2)

Publication Number Publication Date
EP0675780A1 EP0675780A1 (de) 1995-10-11
EP0675780B1 true EP0675780B1 (de) 1998-08-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94902880A Expired - Lifetime EP0675780B1 (de) 1992-12-23 1993-12-16 WERKSTÜCKSCHLEIFVORRICHTUNG UND WERKSTüKSCHLEIFVERFAHREN

Country Status (7)

Country Link
EP (1) EP0675780B1 (de)
AT (1) ATE169543T1 (de)
AU (1) AU5705594A (de)
CA (1) CA2151400C (de)
DE (1) DE69320368T2 (de)
ES (1) ES2120003T3 (de)
WO (1) WO1994014571A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1073908C (zh) * 1998-07-08 2001-10-31 上海机床厂有限公司 母线平行于回转轴线的柱面工件的磨削方法和装置
JP3649037B2 (ja) * 1999-04-14 2005-05-18 豊田工機株式会社 複合研削盤
CN104440478B (zh) * 2014-11-14 2016-09-21 广州遂联自动化设备有限公司 一种抛光与拉丝的流水式设备
CN105965329A (zh) * 2016-06-16 2016-09-28 成都迅德科技有限公司 一种磨刀机
CN109342316A (zh) * 2018-11-27 2019-02-15 北京林业大学 一种砂带使用寿命检测装置及方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB481722A (en) * 1936-10-27 1938-03-16 Deckel Friedrich Improved method of grinding cam shafts
US3222822A (en) * 1962-09-07 1965-12-14 Irving G Winer Cam finishing apparatus
DE2333041A1 (de) * 1973-06-29 1975-01-23 Karstens Georg Messgeraete Universalschleifspindelstock
CH666214A5 (en) * 1984-11-05 1988-07-15 Konrad Fehr Multi-purpose grinding and polishing machine - has housing with turret either end each with set of grinding and/or polishing discs
HU209638B (en) * 1989-10-27 1994-09-28 Miskolci Egyetem Method and apparatus for generating machining with abrasive belt
DE4137924C2 (de) * 1991-11-18 1997-12-04 Schaudt Maschinenbau Gmbh Verfahren und Vorrichtung zum numerisch gesteuerten Schleifen von Nocken einer Nockenwelle

Also Published As

Publication number Publication date
CA2151400C (en) 2001-02-27
ATE169543T1 (de) 1998-08-15
WO1994014571A1 (en) 1994-07-07
CA2151400A1 (en) 1994-07-07
DE69320368T2 (de) 1999-01-07
AU5705594A (en) 1994-07-19
DE69320368D1 (de) 1998-09-17
ES2120003T3 (es) 1998-10-16
EP0675780A1 (de) 1995-10-11

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