EP0054214B1 - Procédé de dressage de meules et dispositif à cet effet - Google Patents

Procédé de dressage de meules et dispositif à cet effet Download PDF

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Publication number
EP0054214B1
EP0054214B1 EP81110024A EP81110024A EP0054214B1 EP 0054214 B1 EP0054214 B1 EP 0054214B1 EP 81110024 A EP81110024 A EP 81110024A EP 81110024 A EP81110024 A EP 81110024A EP 0054214 B1 EP0054214 B1 EP 0054214B1
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EP
European Patent Office
Prior art keywords
roller
grinding wheel
grinding
ratio
unit
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
Application number
EP81110024A
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German (de)
English (en)
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EP0054214A1 (fr
Inventor
Jaroslav Vlk
Johannes Woynowski
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.)
Gebr Maegerle AG
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Gebr Maegerle AG
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4349000&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0054214(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Gebr Maegerle AG filed Critical Gebr Maegerle AG
Priority to AT81110024T priority Critical patent/ATE12603T1/de
Publication of EP0054214A1 publication Critical patent/EP0054214A1/fr
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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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • 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
    • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/07—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels by means of forming tools having a shape complementary to that to be produced, e.g. blocks, profile rolls

Definitions

  • the present invention relates to a method for processing grinding wheels by means of a driven processing roller with relatively soft roll binding material and hard roll grain, wherein the grinding wheel is treated with sequentially different speed ratios between the circumferential speed of the wheel and the circumferential speed of the wheel, and also to an apparatus for carrying out this method.
  • the peripheral speed r ⁇ ⁇ ⁇ of the roller is equal to the peripheral speed r s " ro s of the grinding wheel.
  • the pressure between the roller and the grinding wheel increases the compressive strength of the binding agent on the grinding wheel and individual grains from the grinding wheel With this pressure, the grinding wheel is processed onto the negative form of the crushing roller.
  • the surface quality of the grinding wheel which corresponds to the grinding wheel grit, cannot be influenced. It is relatively rough and results in a correspondingly rough workpiece surface during the grinding process.
  • the second method known as roller diamond coating, which uses the former in addition, a diamond-coated preparation roller is used, a so-called diamond roller.
  • the diamond roller is moved at a different speed than the grinding wheel, so that due to its relative movement, the diamonds cut off the grinding wheel grains. With this method, the grinding wheel surface becomes much smoother than in the first method, depending on the relative speed ratio chosen.
  • the grinding wheel grain is cut with this method, which results in a relatively smooth grinding wheel surface.
  • the aim of the present invention is to further develop the above-mentioned method and the known device in such a way that, with the preparation roller provided, in addition to the processing of the grinding wheel, to a desired profile with a relatively smooth surface in the sense of roll diamond coating, said grinding wheel with the same roll afterwards can also be made sleek.
  • the grinding machine 1 comprises a stable support frame 3, on the upper side of which, the actual grinding machine bed 5, a machine table 7 is mounted so as to be longitudinally displaceable. Perched vertically, a stand 9 is arranged on a long side of the basically cube-shaped support frame 3, stably connected to the latter, on which a vertical support 11 is attached vertically, ie displaceably perpendicular to the machine table 7.
  • the vertical support 11 projects parallel to the table 7 above the latter and forms the support for a horizontal support 13 arranged horizontally displaceably thereon.
  • the horizontal support 13 is thus movable parallel to the plane of the table 7 and perpendicular to its one degree of freedom.
  • the grinding wheel 19 is of course rotatably mounted on the console 17 about an axis parallel to the table 7 and perpendicular to its degree of freedom, while the processing roller 21, in addition to its rotatable mounting, is designed to carry out a translational movement, preferably parallel to the stand 9, so that it can be brought into contact with the grinding wheel 19.
  • a carrier element 23 which projects downward beyond the bracket to such an extent that its end comes to lie at the height of the grinding wheel working area 25. At this end there is a water nozzle 27, directed towards the work area.
  • FIG. 1 makes no claim whatsoever to want to show construction features, but instead serves to define the definition of the representation of how the individual grinding machine assemblies are movable relative to one another.
  • FIG. 2 shows the arrangement according to FIG. 1 in a highly schematic manner.
  • the corresponding modules have the same position symbols.
  • the vertical support 11 guides the grinding wheel 19 to a workpiece 29 during the grinding process. This corresponds to the movement according to arrow A of Fig. 1.
  • the table 7 serves the horizontal support 13, which supports the console 17. This corresponds to the movement according to arrow B in FIG. 1.
  • the processing roller 21 in turn on the bracket 17 translationally, for example movable parallel to the carrier 9 according to the arrow C of FIG. 1, serves to reprocess a worn grinding wheel 19 with respect to its profile and also its surface quality.
  • a zero value specification 31 is arranged on a stationary assembly, be it on the stand 9 or on the support frame 3. It protrudes parallel to the stand 9 and is operatively connected to a zero value sensor 33 lying vertically above it, which at least in the vertical direction, i.e. is moved parallel to the stand 9 synchronously with the grinding wheel 19.
  • the zero value sensor 33 can be attached to the console 17 or directly to the vertical support 11.
  • the zero value specification 31 with a stop 35 for the sensor 33 is set such that the sensor 33 then touches the stop 35 when the grinding wheel 19 has ground the workpiece 29 down to its desired value.
  • this is shown in FIG. 2 in such a way that the zero sensor 33 projects down to the height of the grinding wheel working area 25 and thus the stop 35 is set exactly to the desired value height of the workpiece 29 being processed.
  • the original height is shown in dashed lines on the workpiece.
  • D was the shortest distance from the vertical support 11 to the grinding surface of the disc 19 before starting work X so, it is after the treatment X 'so , where X so ⁇ X ' so .
  • the difference between these two sizes corresponds to half the diameter reduction of the grinding wheel 19. If the grinding wheel 19 were now ground with unchanged setting of the zero value specification 31 and the zero value sensor 33, the workpiece 29 would be machined too little by half the diameter reduction.
  • the setpoint In order to always work the workpiece down to the same height, the setpoint, either the height of the zero value specification 31 must be reduced in accordance with the radius decrease of the grinding wheel 19, or the zero value sensor 33 must be placed on the new working area of the grinding wheel 19 or . can be adjusted by reducing the radius against the axis of rotation of the grinding wheel.
  • the preparation roller 21 must cover the distance between the roller periphery and the disc periphery before it comes into contact with the grinding wheel 19 for the first time, which is represented by the distance (X so -X RO ) according to FIG. 2.
  • the distance X will increase in such a way that the information about how much the wheel 19 has been processed in the immediately preceding preparation process must be stored for the preparation roller feed.
  • a water nozzle 27 is directed onto the working area 25 of the grinding wheel 19, as has already been explained with reference to FIG. 1. So that the alignment of its cooling jet always remains precisely aligned to this area 25, the nozzle 27 must be moved up with respect to the vertical support 11 by exactly the amount that the conditioning roller 21 has removed from the grinding wheel 19.
  • a signal flow diagram in FIG. 3 shows how the compensations for the grinding wheel removal can be carried out.
  • the information 1 is preferably in the form of electrical signals.
  • a sensor 38 a for detecting X RO a sensor 38 b for detecting X so and an input device 38 c for the roll feed are basically provided.
  • a first superposition unit 37 when a preparation process is triggered for the first time, for example with the buttons 36, the information I (X Ro ) and I (X so ) after being stored in memories 40 a , 40 b , the difference result ⁇ l of a second superposition unit 39 is compared fed.
  • this difference information ⁇ l is superimposed with the information I v (t), which is applied, for example, with the switch 36 a , and the result is fed to a converter unit 41, which converts this information into a mechanical displacement X R (t) for the processing roller 21.
  • the converter 41 is an electromechanical converter, for example an electric motor arrangement.
  • the information l v (t) is checked in principle in a unit 43 for an extreme point.
  • a switch unit 45 is closed, so that the instantaneous value of the information l v (t) is then entered into a storage unit 47. Since this instantaneous information corresponds to the radius decrease of the grinding wheel 19, and thus must be added to the original default value I (X so ) in a next preparation process, the output of the memory 47 is fed to the superposition unit 37.
  • the content of the memory 47 also corresponds to the information on how far both the water nozzle and the zero value setting must be compensated. The memory content is therefore supplied to at least one further converter 49, via which the said compensations are carried out.
  • the signal flow diagram shown in FIG. 1 is only intended to show a basic possibility of carrying out the necessary compensations and feed movements. It goes without saying that a large number of possible modifications can be made which aim at the same effect.
  • Fig. 4 the resulting grinding wheel roughness is qualitatively plotted against the ratio of the peripheral speed VR of the dieting roller 21 and the peripheral speed v s of the grinding wheel 19.
  • the aim must also be to achieve an optimum cutting ability corresponding to R M at the peripheral speed ratio 1 with the diamond roller. In terms of the method, this is now achieved by profiling the grinding wheel in a first preparation process with the peripheral speed ratio of at least almost 0.75 and then making it sleek with the ratio of at least almost 1. Since the profiling is carried out at a ratio of approx.
  • the subsequent cutting of the already finished wheel profile can subsequently be done with a ratio of at least almost 1 and with a small infeed, which is smaller than the excess of diamonds over the binder, can be reworked.
  • the binding agent never comes into contact with the grinding wheel and is not damaged. The diamonds will not fail due to damage to the binding agent.
  • the adjustment of the orbital speed ratios from point I in the ratio 0.75 to point II at ratio 1 is indicated by arrow a in FIG. 4.
  • the grinding machine according to FIG. 1 enables automatic execution of the method steps from points I and 11 (FIG. 4) and additionally, if desired, from point III.
  • FIG. 5 shows a functional block diagram for the automatic execution of the processing method described above.
  • a start switch 50 By closing a start switch 50, the grinding wheel drive 51 and, with the switch 53 closed, the roller feed drive 55 and the roller drive 57 are started.
  • the conditioning roller 59 is fed to the grinding wheel 61 in accordance with the roller feed path X R (t) (see FIG. 3).
  • a detector 63 By means of a detector 63, the portion of X R (t) is detected which is the diameter or. Radius decrease AD corresponds to the grinding wheel 61.
  • This value AD is checked in a first comparison unit 65 to determine whether it is greater or less than a predetermined threshold value .DELTA..D 1 .
  • roller drive 57 and the grinding wheel drive 51 are controlled via a first ratio control unit 67 in accordance with the circumferential speed ratio from point of FIG. 4, this unit 67 preferably continuously adjusting the circulating speeds ⁇ R, respectively, in accordance with AD. ⁇ S of role resp. Disc.
  • the diameter decrease AD is greater than the predetermined first threshold value ⁇ D 1 ; it is compared in a second comparison unit 69 with a second predetermined threshold value AD 2 and, if it is smaller than this threshold value, the two drive units 57 and 51 are controlled via a second ratio control unit 71 in accordance with the peripheral speed ratio of point II of FIG. 4 controlled.
  • the threshold value ⁇ D 1 thus corresponds to a predetermined profiling depth and the threshold value AD 2 corresponds to the grinding wheel dimension to be achieved when cutting.
  • a switchover unit 73 is actuated, which connects a control unit 77 for the grinding process to the grinding wheel drive 51 via a switch 75, and which opens the switch 53, so that the roller drive 57 and the roller feed drive 55 are stopped.
  • the preparation roll is now lifted off the grinding wheel.
  • the grinding process which is now triggered automatically and is controlled by the unit 77, causes the vertical support of the machine to be advanced by means of its drive group 79.
  • This feed movement is sensed by a detector 81, for example a potentiometer, and fed to a further comparison unit 83. If the vertical support feed reaches a predetermined threshold value V o , the profile grinding process is completed and the switchover unit 73 is reset. The control of the grinding machine drive by the unit 77 is interrupted again and with the closing switch 53 both the drive 55 for the roller infeed and the roller drive 57 are restarted. The grinding wheel drive always remains started. Since the decrease in diameter sensed by the detector 63 is now greater than AD 2 and a switch 85 has been closed when the threshold value V o for the vertical feed has been reached, the peripheral speed ratio of the roller and grinding wheel is controlled by a further ratio control unit 87, corresponding to the ratio of point 111 in FIG. 4.
  • a detector 81 for example a potentiometer
  • the switching unit 73 is triggered again, as a result of which the last preparation step on the grinding wheel is ended and the fine grinding process is started. Then when the final finished dimensions for the Workpiece whose processing is canceled by opening switch 50.
  • the two units 89 and 91 alternatively feed the corresponding control signals from the ratio control units 67 and 71 or 87 to the drives 57 and 51, or feed the control signals from the control unit 77 to the drive 51 during the grinding process.
  • the roller feed drive 55 as indicated by the return lines 93, is influenced by the control units 67, 71 and 87, depending on the peripheral speed ratio kept constant there. Depending on this ratio, the roll feed can take place only slowly or more quickly, as has been explained with reference to FIG. 4.
  • control functions described with reference to Fig. Can be carried out by conventional in e g-built function blocks in analog, digital, or hybrid technology.
  • a process computer is particularly suitable if additional monitoring, regulating and control functions are to be automated.
  • the described method allows with appropriate control, such as 4, also automatically with an infinitely adjustable speed of the preparation roller and / or grinding wheel, preferably with a diamond roller, to profile the grinding wheel and then make it sleek.
  • the same diamond roller can then be used in a further preparation process to prepare the grinding wheel for fine grinding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (9)

1. Procédé de rénovation de meules abrasives (19) à l'aide d'un galet de rénovation commandé (21) constitué d'un agglomérant de dureté relativement faible et de grains abrasifs durs dans lequel on soumet la meule abrasive à des rapports de vitesse séquentiels différents entre vitesse périphérique du galet et vitesse périphérique de la meule abrasive, caractérisé par le fait qu'on profile en premier lieu la meule abrasive avec un premier rapport de vitesse périphérique entre galet et meule inférieur à 1 et à laquelle on rend ensuite son pouvoir abrasif avec un deuxième rapport au moins pratiquement égal à 1.
2. Procédé suivant la revendication 1, caractérisé par le fait qu'on met en oeuvre en qualité de galet de rénovation un galet diamanté.
3. Procédé suivant la revendication 1, caractérisé par le fait que l'on fixe l'approche du galet par rapport à la meule lors de la mise en oeuvre du deuxième rapport de vitesse à une distance réduite, de telle façon que seuls les grains abrasifs du galet entrent en contact avec la meule abrasive, à l'exclusion de l'agglomérant retenant les grains.
4. Procédé suivant la revendication 1, caractérisé par le fait que l'on fixe le premier rapport de vitesse à une valeur de l'ordre de 0,75 ou inférieure à cette dernière.
5. Procédé suivant la revendication 1, caractérisé par le fait que l'on soumet la meule abrasive ayant reçu son pouvoir abrasif après exécution Je l'opération d'usinage par abrasion à un troisième rapport de vitesse inférieur audit deuxième rapport de vitesse en vue d'apprêter la meule abrasive aux opérations de superfinition.
6. Dispositif de rénovation de meules abrasives pour une machine comportant un mécanisme de commande d'un galet de rénovation et un mécanisme de commande d'une meule abrasive en vue de la mise en oeuvre du procédé suivant la revendication 1, caractérisé par le fait qu'il comprend un dispositif-de commande pour la sélection automatique séquentielle des régimes de rotation du galet et/ou de la meule abrasive sur au moins deux rapports prédéfinissables de leurs vitesses périphériques respectives.
7. Dispositif suivant la revendication 6 dans lequel le galet de rénovation peut être approché contre la meule abrasive de la machine, caractérisé par le fait qu'il comprend des moyens détecteurs (63) de l'avance du galet, laquelle correspond à la perte de diamètre (AD) de la meule abrasive (61) lors de la rénovation et par le fait que l'entrée d'un premier comparateur (65) est raccordée auxdits moyens détecteurs (63) et la sortie dudit premier comparateur est raccordée à une première unité de commande de rapport (67) pour les rapports des vitesses périphériques du galet et de la meule ainsi qu'à un second comparateur (69) et par le fait que le premier comparateur relie les moyens détecteurs (63) avec la première unité de commande de rapport (67) aussi longtemps que la valeur détectée (ΔD) est plus petite ou égale à une première valeur de seuil (△D1) prédéfinissable, en vue d'activer et de commander ladite unité de commande de rapport (67) et par le fait, qu'en cas contraire, ledit premier comparateur (65) relie lesdits moyens détecteurs (63) avec ledit second comparateur (69) dont la sortie est raccordée à une seconde unité de commande de rapport (71) et à une unité de commutation (73) et qui interconnecte lesdits moyens détecteurs (63) avec ladite seconde unité de commande de rapport (71) en vue de l'activer et de la commander lorsque la valeur détectée (AD) est plus petite ou égale à une seconde valeur de seuil (AD2) prédéfinissable et, sinon, avec l'unité de commutation (73), cette dernière étant dès lors déclenchée au moins remettant à l'état initial l'avance d'approche du galet (55).
8. Dispositif suivant la revendication 7 sur une machine d'usinage par abrasion avec un mécanisme de commande de course verticale pour la meule abrasive, caractérisé par le fait que l'unité de commutation (73) active sur la machine, simultanément avec le retour à l'état initial de l'avance d'approche du galet, une unité de commande d'opérations d'usinage par abrasion (77) pour le mécanisme de commande de la meule abrasive (51) et le mécanisme de commande de course verticale (79) pour la meule abrasive (61).
9. Dispositif suivant la revendication 8, caractérisé par le fait qu'il comprend des dispositifs de détection (81) de la course d'avance verticale du mécanisme de la machine lesquels sont raccordés à un troisième comparateur (83), ce dernier interrompant l'opération d'usinage par abrasion de la machine et reprenant l'opération de rénovation par remise à l'état initial de l'unité de commutation (73) dès que la course d'avance verticale détectée (AV) est égale ou supérieure à une valeur de seuil (Vo) prédéfinissable et que ledit même comparateur (83) ferme un commutateur (85) entre lesdits moyens détecteurs (63) de l'avance du galet et une troisième unité de commande de rapport (87).
EP81110024A 1980-12-11 1981-12-01 Procédé de dressage de meules et dispositif à cet effet Expired EP0054214B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110024T ATE12603T1 (de) 1980-12-11 1981-12-01 Verfahren zum aufbereiten von schleifscheiben und vorrichtung zu dessen ausfuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9161/80 1980-12-11
CH916180 1980-12-11

Publications (2)

Publication Number Publication Date
EP0054214A1 EP0054214A1 (fr) 1982-06-23
EP0054214B1 true EP0054214B1 (fr) 1985-04-10

Family

ID=4349000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110024A Expired EP0054214B1 (fr) 1980-12-11 1981-12-01 Procédé de dressage de meules et dispositif à cet effet

Country Status (5)

Country Link
US (1) US4458660A (fr)
EP (1) EP0054214B1 (fr)
JP (1) JPS57168863A (fr)
AT (1) ATE12603T1 (fr)
DE (1) DE3169891D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2193127A (en) * 1986-08-01 1988-02-03 Unicorn Ind Plc Dressing of grinding wheels
GB2343133A (en) * 1998-09-09 2000-05-03 Renold Plc Dressing grinding wheels
JP2000237957A (ja) * 1999-02-22 2000-09-05 Hitachi Seiki Co Ltd 研削盤
JP3844420B2 (ja) 2000-09-04 2006-11-15 株式会社牧野フライス製作所 マシニングセンタ及びその工具交換方法
AT412197B (de) * 2002-11-22 2004-11-25 Lisec Peter Vorrichtung zum bearbeiten von werkstoffplatten
ITMO20100070A1 (it) * 2010-03-17 2011-09-18 Giuseppe Soli Macchina per il taglio e/o la profilatura di manufatti sostanzialmente lastriformi
CN103894930B (zh) * 2014-04-18 2016-04-20 环球石材（福建）有限公司 一种磨轮的成型及修磨专用设备

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE24448E (en) * 1958-04-01 Method of grinding
US2664681A (en) * 1948-07-19 1954-01-05 Robert J Hood Method of dressing diamond wheels
FR1070546A (fr) * 1952-10-31 1954-07-28 Diamant Boart Sa Procédé de rectification des meules et dispositif pour la mise en oeuvre de ce procédé
US2877758A (en) * 1954-01-06 1959-03-17 Sheffield Cleveland Corp Machine tool
US2775078A (en) * 1955-06-17 1956-12-25 Ncr Co Method and apparatus for forming grinding wheels
US3006332A (en) * 1958-10-10 1961-10-31 Norton Co Powered rotary truing device
FR1316314A (fr) * 1962-02-28 1963-01-25 Herminghausen Werke G M B H Procédé et dispositif pour le dressage répété de la meule de rectifieuses de précision, notamment de machines sans centre à rectifier les surfaces cylindriques
US3204628A (en) * 1963-05-08 1965-09-07 Magerle Karl Grinding device having integrally mounted means for profiling the grinding wheel
US3584616A (en) * 1968-08-08 1971-06-15 Landis Tool Co Truing mechanism for grinding wheels
US3695249A (en) * 1970-08-12 1972-10-03 Henry F Swenson Grinding wheel dressing apparatus
DE2321477C3 (de) * 1973-04-27 1979-11-15 Ernst Winter & Sohn, 2000 Hamburg Verfahren und Vorrichtung zum Abrichten und Schärfen von Schleifscheiben
GB1440868A (en) * 1974-04-29 1976-06-30 Winter & Sohn Ernst Method of and apparatus for dressing and sharpening grinding wheels
JPS5834257B2 (ja) * 1978-04-27 1983-07-26 豊田工機株式会社 ロ−タリドレツサによる砥石ドレツシング方法及び装置
US4222362A (en) * 1979-04-02 1980-09-16 Litton Industrial Products, Inc. Speed control for a rotary dressing wheel

Also Published As

Publication number Publication date
JPS57168863A (en) 1982-10-18
ATE12603T1 (de) 1985-04-15
EP0054214A1 (fr) 1982-06-23
DE3169891D1 (en) 1985-05-15
US4458660A (en) 1984-07-10

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