WO2000016945A1 - Method, tool and device for rectifying on site collectors and slip rings in electric machines - Google Patents

Method, tool and device for rectifying on site collectors and slip rings in electric machines Download PDF

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Publication number
WO2000016945A1
WO2000016945A1 PCT/FR1999/002213 FR9902213W WO0016945A1 WO 2000016945 A1 WO2000016945 A1 WO 2000016945A1 FR 9902213 W FR9902213 W FR 9902213W WO 0016945 A1 WO0016945 A1 WO 0016945A1
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WO
WIPO (PCT)
Prior art keywords
tool
machining
pad
suction
angle
Prior art date
Application number
PCT/FR1999/002213
Other languages
French (fr)
Inventor
Peter Ovaere
Thierry Laurent
Original Assignee
Le Carbone Lorraine
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 Le Carbone Lorraine filed Critical Le Carbone Lorraine
Publication of WO2000016945A1 publication Critical patent/WO2000016945A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
    • B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/005—Geometry of the chip-forming or the clearance planes, e.g. tool angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/0046—Devices for removing chips by sucking
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/08—Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/31—Diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/62—Use of suction

Definitions

  • the invention relates to electrical machines, such as motors, comprising manifolds or rings fixed to the rotor of said machines. It particularly relates to the rectification of said collectors and rings.
  • the rectification of industrial machines is generally a cumbersome operation which involves significant costs and delays.
  • the traditional methods of rectification require a long intervention on the machine, which involves stopping the machine for a long and variable period of time, depending on the difficulties encountered during the intervention.
  • the complete rectification operation includes uncoupling the machine and its mechanical load, removing the machine and transporting it to a duly equipped workshop where the actual rectification takes place.
  • Workshop interventions include dismantling the rotor and rectifying it in the traditional lathe.
  • the rectification may also require an additional step of lowering the micas O 00/16945
  • a rectification device comprising a frame, which is mounted in the head of the machine, means for fixing and turning a dry machining tool, and an auxiliary means for driving the machine and thus rotating the rotary contact to be rectified, such as an auxiliary motor.
  • the combination of the rotational movement of the rotary contact and the axial displacements of the tool obtained using the turning means ensures rectification of the entire surface of the rotary contact.
  • the machining tool is generally an abrasive stone in order to avoid the risk of damage by biting or penetration of the metal, this type of damage occurring easily with standard tools when the frame bends slightly during machining.
  • the first object of the invention is a method of rectifying the rotary contacts of electrical machines in which a cutting tool of very high hardness is used and inclined with respect to the radius of said contact so as to cause low penetration into said contact and to produce cutting waste of small dimensions, and in which said waste is evacuated by suction near the pellet of said tool.
  • the method of rectifying a rotary contact of an electric machine comprises the installation of a rectification device, the rotational drive of said rotor, so as to produce a rotary movement of said contact, and the machining of said rotary contact using said device, said device comprising a grinding tool and a turning means of said tool, said tool comprising a fixing handle and a pad of dry machining, said pellet comprising a working face, said method being characterized in that said pellet is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that the machining waste is evacuated by suction near said pad, and in that said tool is placed relative to said contact so that said working face is inclined at an ang the ⁇ , called “cutting angle", towards the front with respect to the direction of rotation of said contact, the angle ⁇ preferably being between 3 ° and 12 °, and more preferably still between 5 ° and 10 °
  • angles ⁇ and ⁇ are such that the machining produces cutting waste of sufficiently small dimensions to be easily sucked in and discharged by said suction and such that the machining does not cause biting or penetration of the metal.
  • the invention also relates to a rectification tool which makes it possible to implement the rectification method of the invention.
  • the grinding tool according to the invention comprises a fixing handle and a machining pad, said pad comprising a working face, and is characterized in that said pad is made of a material of high hardness, that is to say -d say hardness at least equal to 10 on the Mohs scale, in that said working face is inclined upward by a vertical angle ⁇ relative to the main axis of said handle, preferably between 8 ° and 22 °, and preferably still between 10 ° and 20 °, and in that it comprises means for aspiration and evacuation of machining waste making it possible to produce a suction area near said pellet machining .
  • the invention also relates to a rectification device making it possible to implement the rectification method of the invention .
  • the grinding device of a rotary contact of the invention comprises a frame, a dry machining tool, comprising a coupling sleeve and a processing wafer, and means of attachment and f i of turning operation of said tool, and is characterized in that said frame to mount said handle such that said tool is inclined towards the era arr i relative to the direction of rotation of said contact at an angle ⁇ preferably between 5 ° and 10 °, and in such a way that the working face is inclined forwards with respect to said direction of rotation by an angle ⁇ , called the cutting angle, preferably between 3 ° and 12 °, and more preferably between 5 ° and 10 °, and in that it comprises means of suction and evacuation of the machining waste produced near said pellet.
  • FIG. 1 shows, schematically, a rectification device (1) of rotary contacts of electric machines according to the prior art mounted on an electric machine head, (a) in side view and (b) in axial view according to the section plane AA ' (b).
  • the rectification device (1) of the prior art typically comprises a frame (2), which is mounted in the head of the machine (21), fixing means (4) and displacement and turning means (5 ) a dry machining tool (3), and an auxiliary means, such as an auxiliary motor, for driving the machine and thus rotating the rotary contact (20) to be rectified.
  • the grinding device is generally fixed to the machine using the fixing pin (6) of the brush holders (7).
  • the combination of the rotational movement of the rotary contact (S) and the axial displacements (D) of the tool obtained using the turning means ensures rectification of the entire surface of the rotary contact.
  • FIG. 2 schematically illustrates a device for rectifying rotary contacts of electric machines according to the invention, seen in the axis of the machine.
  • FIG. 3 defines the angles relative to the orientation of the cutting tool and to the working face of the machining pad according to the invention.
  • FIG. 4 illustrates the cutting tool according to a preferred embodiment of the invention, seen from the side (a) and seen from above (b).
  • FIG. 5 illustrates a collector milling cutter intended for lowering the micas and the resin used for the rectification of the collectors according to the invention.
  • the method for rectifying a rotary contact (20) of an electric machine (23), said rotary contact being fixed to the rotor (22) of the machine comprises the installation of a rectification device ( 1, 10), the rotation drive of the rotor (22), and the machining of the contact (20) using the device (1, 10), said device comprising a grinding tool (13) and a means for turning said tool, said tool comprising a fixing handle (32) and a dry machining pad (34), said pad comprising a working face (35), said method being characterized in that said pad (34) is made of a material with high hardness, i.e. at least hardness O 00/16945
  • the angle ⁇ can be measured between the longitudinal axis (31) of the handle (32) - or a parallel axis (310) passing through the point of contact between the pad and the rotary contact - and the radius R of the contact.
  • Said high hardness material is preferably a diamond.
  • the machining pad (34) can be fixed to the tool (30) via a machining plate (33).
  • the angle ⁇ between the axis (31) of the handle and the front plane (Q) of the pad (34) is less than 100 °, so as not to hinder the positioning of the pad (34) by report to contact (20).
  • the cutting angle ⁇ is small, and preferably between 3 ° and 12 °, and more preferably between 5 ° and 10 °.
  • a cutting angle that is tilted too far forward would increase the risk of biting into the metal in an unacceptable way.
  • too large a cutting angle would reduce the amount of metal removed by the machining pass and unnecessarily increase the number of passes, and therefore the length of the intervention.
  • said suction forms a confined suction zone near the pellet (34), so as to efficiently channel the machining waste, to limit its dispersion and to increase the efficiency of the suction.
  • This confinement is advantageously obtained using means such as a sleeve or a cover, these means preferably being made of electrically insulating material.
  • the Applicant has surprisingly found that the combined use of a material of great hardness to perform the rectification of the rotary contact, of a slight inclination towards the front of the machining pad and of a slight inclination towards the back of the tool handle allows grinding to be carried out quickly and very reliably, with high precision and without deterioration of the contact, while effectively eliminating machining waste.
  • the high hardness pad offers a wear rate during machining which is sufficiently low that it is not necessary to advance said tool with each pass and to penetrate deeply into the material to be machined.
  • the invention thus makes it possible to produce small waste which is easy to evacuate by means of suction of small dimensions and to carry out the rectification at high speed, without causing untimely bites of the contact surface by the pad.
  • the working face (35) is inclined upwards by a vertical angle ⁇ , which is preferably between 8 ° and 22 °, relative to the axis (31) of the handle (32) of the tool (30), and the cutting angle ⁇ is obtained by tilting the handle (32) relative to the radius R of the contact (20) by a vertical angle ⁇ between 5 ° and 10 °.
  • the angle ⁇ thus corresponds to the sum of the angles ⁇ and ⁇ .
  • the grinding tool (130) comprises a fixing handle (132), a rear part (141), a front part (140), and a dry machining pad (134) fixed on said part. front and comprising a working face (135), said tool being characterized in that the pad (134) is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that the working face (135) is inclined upwards by a vertical angle ⁇ , relative to the main axis (131) of the handle (132 ) - or relative to a parallel axis (1310) passing through the point of contact between the pad (34) and the rotary contact (20) -, which is preferably between 8 ° and 22 °, and more preferably still included between 10 ° and 20 °, and in that it comprises means for aspirating and evacuating machining waste near the machining pad (134), said means for aspirating and evacuating producing a suction area near the tool pad.
  • Said high hardness material is preferably a diamond.
  • the machining pad (134) can be attached to the tool (130) via a machining pad (133).
  • the insert (133) is firmly attached to the tool using a fastening means (1331), such as a bolt.
  • the angle ⁇ between the axis (131) of the handle and the front plane (Q) of the pad (134) is less than 100 °, so as not to hinder the positioning of the pad (134) by report to contact (20).
  • the front plane (Q) of the pad (134) is preferably slightly set back relative to the front end (142) of the tool, that is to say that said end is slightly prominent, so as to offer sufficient mechanical support and avoid, in particular, excessive shearing forces on said pellet.
  • said suction and evacuation means comprise a pipe (137) integrated into the handle (132), preferably substantially in the longitudinal axis (131) of the handle, said pipe comprising at least one suction inlet (136) near the machining pad (134) and at least one outlet (138) provided with fixing means (139) to an external suction and waste evacuation system machining.
  • Said suction means create an effective suction zone in the vicinity of the machining pad.
  • the pipe (137) comprises a main channel (1371) exiting on the rear part (141) of the handle (132), that is to say opening at the end of the handle furthest from the machining insert, and three inlets (1361, 1362, 1363) located at proximity, and distributed around, of the machining pad: an entry, called upper entry (1363), is located on the top of the handle and the other two entries, said side entries (1361, 1362) are located on both sides other from the handle.
  • the outlet or outlets located near the machining insert advantageously have a shape which promotes efficient channeling and aspiration of the machining waste, such as a conical nozzle shape.
  • the tool (130) When the drive is carried out under voltage, as is notably the case with the auxiliary power supplies, it is advantageous to provide the tool (130) with electrical isolation means, so as to eliminate the electrical risks, in particular training short circuits to the right of the machining insert which could damage the surface of the collector.
  • one or more sides of the handle (132) of the tool (130) may be coated, in whole or in part, with parts made of electrically insulating material, such as insulating plates (16).
  • the rectification device (10) comprises a frame (12), a dry machining tool (13), comprising a fixing handle (32), a front part (40) and a rear part ( 41), the front part (40) comprising a machining pad (34), the frame (12) comprising at least one fixing means (14) and means of turning and vertical displacement (15) of said tool, the pad (34) comprising a working face (35), and is characterized in that the frame (12) allows the tool (13) to be mounted so that the main axis (31) of the handle (32) is inclined backwards with respect to the direction of rotation (S) of the contact (20) by a vertical angle ⁇ preferably between 5 ° and 10 °, and so that the working face (35) of the pad (34) is inclined towards the front by an angle ⁇ relative to said direction of rotation, preferably between 3 ° and 12 °, and more preferably still between 5 ° and 10 °, and in that it comprises means suction and discharge of machining waste produced near the pad (34) of the tool (
  • the frame (12) is generally fixed to the head (21) of the machine using one of the fixing pins (6) of the brush holders (7).
  • the frame (12) is preferably fixed to one fixing pins (6) of the brush holders by means of a support (11).
  • the frame support (11) allows the inclination of the frame and the tool to be adjusted and keeps the frame fixed in place during grinding operations.
  • the frame support (11) can be adapted to each type of machine, so as to facilitate the positioning and positioning of the frame and the tool.
  • the frame (12) comprises a frame body (121) which can be fixed to the support (11) and which is provided with said fixing means (14 ), turning and moving (15) of the tool.
  • Said means preferably comprise a carriage (155), a rack screw (151), an axial sliding support (152), a vertical sliding support (153) which can be operated using manual means (154), such as a crank, and fixing means (14), such as a bolt.
  • Said means of suction and discharge of machining waste are preferably integrated into the tool (13), so that at least one suction inlet (36) opens near the pellet (34) of the tool (13) and that at least one evacuation duct (17) fixed to the rear of the tool (13) evacuates the waste (E) using a suction system and outside evacuation.
  • the integration of the suction and evacuation means of machining waste makes it possible to considerably limit the size of the device.
  • the front part (40) of the tool (13) is provided with confinement means (18), such as a sleeve or a cover, which make it possible to efficiently channel the machining waste towards the inlet (s) ( 36) and to limit their dispersion outside the suction zone produced by said suction means.
  • the confinement means (18) are preferably made of electrical insulating material, so as to avoid the possible formation of short circuits by means of metal machining waste.
  • the tool (13) When the drive is carried out under voltage, as is notably the case with the auxiliary power supplies, the tool (13) is then electrically isolated from the frame (12), so as to eliminate electrical risks, in particular the formation of short -circuits to the right of the machining pad which could damage the surface of the manifold.
  • This electrical insulation is advantageously obtained by providing one or more sides of the handle of the tool (13) with pieces of electrically insulating material, such as insulating plates (16), preferably inserted between the fixing means (14) and the 'tool.
  • the insulating pads can also be fixed to the tool, which facilitates the positioning of the tool.
  • the drive is advantageously carried out using low voltage auxiliary power supplies, that is to say capable of delivering voltages below 40 V, the intensity of which is just sufficient to cause the rotation of the motor.
  • the use of a low voltage significantly reduces the electrical risks for the operator and for the devices, and considerably limits the extent of damage to the surface of the collector produced by possible short circuits during rectification.
  • Said auxiliary power supplies are connected to a single-phase or three-phase current source, depending on the power required for driving the motor.
  • the current is preferably rectified, then chopped at high frequency, that is to say at a frequency greater than 1000 Hz, which allows fine regulation of the intensity of the current and therefore of the angular speed of the motor driven in rotation by this current.
  • the low voltage is preferably obtained using a transformer integrated into said power supplies, so that the motor can be electrically isolated from the network.
  • Said power supplies advantageously include a remote control allowing the operator to remotely control the voltage to be delivered. The precise configuration of these supplies varies according to the type of motor, its nominal power and the type of drive. It is advantageous to use a first auxiliary power supply for the excitation and a second, more powerful auxiliary power supply for the armature, that is to say of sufficient power to drive the rotation during machining.
  • the rectification process can also include operations of lowering the micas and resins located between the blades and breaking 00/16945
  • a collector cutter (50) comprising a mini-drill in a handle (58) provided with an angle gear (51), a disc of mixed milling (53), fixed to the shaft (59) of the bevel gear (51) using a fixing means (57), and at least two support rings (54, 55) allowing the disc (53) to be kept at a calibrated distance from the blades (201) of the collector (200).
  • the mixed disc (53) comprises a central disc (531) of diameter Dl sprinkled with diamond dust (533) on its periphery, which allows the abrasion of resins and micas (202), and, on both sides , two conical burs (532, 534), of diameter D2 less than Dl, provided with teeth intended for milling the edges of the blades (201).
  • the support rings (54, 55) are attached on either side of the mixed disc (53) and rest on the collector (200) during milling in order to adjust the milling depth.
  • one of the rings (55) is placed around the bevel gear (51) and the other ring (54) is supported by an arm (56) fixed to the handle (58) using a means of fixing (52).
  • the rings (54, 55) are preferably made of chrome so as to reduce the coefficient of friction between the rings and the blades of the collector and to facilitate the movement of the micas cutter.
  • Rectification operations were carried out, according to the prior art and according to the invention, on 2.5 MW motors.
  • the device and the rectification tool were very similar to those illustrated in FIGS. 2 to 4.
  • the angles ⁇ equal to 7.5 ° and the angle ⁇ equal to 7.5 ° (l angle ⁇ was 15 °).
  • the invention adapts easily to all known electrical machines and are of easy implementation.
  • the rectification device according to the invention allows rectification in a confined environment thanks to its compactness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention concerns a method for rectifying rotary contacts in electric machines which consists in using a cutting tool with high degree of hardness and inclined relative to said contact radius, wherein said debris are evacuated by suction in the proximity of said tool chip and wherein said tool is placed relative to said contact such that said working surface is inclined at an angle β, forwards relative to said contact rotating direction, the angle β ranging preferably between 3° and 12°, and such that said handle is inclined at angle δ rearwards relative to said rotating direction, angle δ preferably ranging between 5° and 10°. The invention also concerns a rectifying tool and a device for implementing said rectification method.

Description

METHODE, OUTIL ET DISPOSITIF DE RECTIFICATION IN SITU DES COLLECTEURS ET BAGUES DE MACHINES ELECTRIQUESMETHOD, TOOL AND DEVICE FOR IN SITU RECTIFICATION OF COLLECTORS AND RINGS OF ELECTRIC MACHINES
Domaine de l'inventionField of the invention
L'invention concerne les machines électriques, telles que des moteurs, comprenant des collecteurs ou des bagues fixés au rotor des dites machines. Elle concerne tout particulièrement la rectification desdits collecteurs et bagues.The invention relates to electrical machines, such as motors, comprising manifolds or rings fixed to the rotor of said machines. It particularly relates to the rectification of said collectors and rings.
Lesdits collecteurs et bagues sont collectivement désignés ci-après par l'expression "contacts rotatifs".Said collectors and rings are collectively designated below by the expression "rotary contacts".
Etat de la techniqueState of the art
Dans le cadre de la maintenance générale des machines électriques industrielles, il est bien connu de rectifier leurs bagues ou leurs collecteurs lorsqu'ils ont développé un défaut de circularité périphérique, c'est-à-dire lorsqu'ils n'ont plus un rayon suffisamment uniforme sur toute leur périphérie. Cette opération permet de prolonger la durée de vie des contacts rotatifs, de limiter l'usure des balais et d'enrayer les vibrations mécaniques.As part of the general maintenance of industrial electric machines, it is well known to correct their rings or their collectors when they have developed a peripheral circularity defect, that is to say when they no longer have a radius sufficiently uniform over their entire periphery. This operation prolongs the life of the rotary contacts, limits the wear of the brushes and stops mechanical vibrations.
La rectification des machines industrielles est généralement une opération lourde qui entraîne des coûts et des délais importants. Les méthodes traditionnelles de rectification nécessitent une longue intervention sur la machine, ce qui entraîne un arrêt de la machine pour un laps de temps long et variable, en fonction des difficultés rencontrées en cours d'intervention. Typiquement, l'opération complète de rectification comprend le désaccouplage de la machine et de sa charge mécanique, la dépose de la machine et le transport à un atelier dûment équipé où s'effectue la rectification proprement dite. Les interventions en atelier comprennent le démontage du rotor et la rectification de celui-ci au tour traditionnel. Dans le cas des collecteurs, la rectification peut aussi nécessiter une étape supplémentaire d'abaissement des micas O 00/16945The rectification of industrial machines is generally a cumbersome operation which involves significant costs and delays. The traditional methods of rectification require a long intervention on the machine, which involves stopping the machine for a long and variable period of time, depending on the difficulties encountered during the intervention. Typically, the complete rectification operation includes uncoupling the machine and its mechanical load, removing the machine and transporting it to a duly equipped workshop where the actual rectification takes place. Workshop interventions include dismantling the rotor and rectifying it in the traditional lathe. In the case of collectors, the rectification may also require an additional step of lowering the micas O 00/16945
et de la résine, généralement à l'aide d'un disque rotatif, et de cassage des angles saillants des lames du collecteur.and resin, generally using a rotating disc, and breaking the salient angles of the collector blades.
Or, ces méthodes présentent des inconvénients importants, tels que la nécessité d'un réalignement de la machine suite à la rectification l'impossibilité de prendre en compte, en atelier, des déformations de la ligne d'arbre dans les paliers.However, these methods have significant drawbacks, such as the need for a realignment of the machine following the rectification, the impossibility of taking into account, in the workshop, deformations of the shaft line in the bearings.
Afin d'éviter ces difficultés, il est maintenant connu d'effectuer la rectification "in situ" des contacts rotatifs. A cette fin, on utilise un dispositif de rectification comprenant un bâti, qui est monté dans la tête de la machine, des moyens de fixation et de chariotage d'un outil d'usinage à sec, et un moyen auxiliaire pour entraîner la machine et mettre ainsi en rotation le contact rotatif à rectifier, tel qu'un moteur auxiliaire. La combinaison du mouvement de rotation du contact rotatif et des déplacements axiaux de l'outil obtenus à l'aide du moyen de chariotage assure une rectification de toute la surface du contact rotatif. L'outil d'usinage est généralement une pierre abrasive afin d'éviter les risques d'endommagement par morsure ou pénétration du métal, ce type d'endommagement se produisant facilement avec des outils standards lorsque le bâti fléchit légèrement en cours d'usinage.In order to avoid these difficulties, it is now known to carry out "in situ" rectification of the rotary contacts. To this end, a rectification device is used comprising a frame, which is mounted in the head of the machine, means for fixing and turning a dry machining tool, and an auxiliary means for driving the machine and thus rotating the rotary contact to be rectified, such as an auxiliary motor. The combination of the rotational movement of the rotary contact and the axial displacements of the tool obtained using the turning means ensures rectification of the entire surface of the rotary contact. The machining tool is generally an abrasive stone in order to avoid the risk of damage by biting or penetration of the metal, this type of damage occurring easily with standard tools when the frame bends slightly during machining.
Or, la rectification in situ, selon l'état de la technique, reste une longue opération qui immobilise la machine pour un laps de temps significatif, qui est typiquement de quelques dizaines d'heures, et qui entraîne le dépôt dans le bobinage de la machine de déchets et poussières d'usinage, tels que des copeaux de métal arrachés par l'usinage, qui peuvent conduire à la formation de courts-circuits.However, rectification in situ, according to the state of the art, remains a long operation which immobilizes the machine for a significant period of time, which is typically a few tens of hours, and which results in the deposition in the winding of the machine waste and machining dust, such as metal shavings removed by machining, which can lead to the formation of short circuits.
La demanderesse a donc recherché des moyens et des méthodes de rectification in situ des contacts rotatifs de machines électriques qui réduisent la longueur des interventions de manière significative et qui éliminent les risques de courts-circuits consécutifs à l'opération de rectification. Description de l'inventionThe Applicant has therefore sought means and methods for in situ rectification of rotary contacts of electrical machines which reduce the length of the interventions significantly and which eliminate the risks of short circuits following the rectification operation. Description of the invention
Le premier objet de l'invention est un procédé de rectification des contacts rotatifs de machines électriques dans lequel on utilise un outil de coupe de dureté très élevée et incliné par rapport au rayon dudit contact de façon à entraîner une faible pénétration dans ledit contact et à produire des déchets de coupe de petites dimensions, et dans lequel lesdits déchets sont évacués par aspiration à proximité de la pastille dudit outil.The first object of the invention is a method of rectifying the rotary contacts of electrical machines in which a cutting tool of very high hardness is used and inclined with respect to the radius of said contact so as to cause low penetration into said contact and to produce cutting waste of small dimensions, and in which said waste is evacuated by suction near the pellet of said tool.
Selon l'invention, le procédé de rectification d'un contact rotatif de machine électrique, ledit contact rotatif étant fixé au rotor de ladite machine, comprend la mise en place d'un dispositif de rectification, l'entraînement en rotation dudit rotor, de manière à produire un mouvement rotatif dudit contact, et l'usinage dudit contact rotatif à l'aide dudit dispositif, ledit dispositif comprenant un outil de rectification et un moyen de chariotage dudit outil, ledit outil comprenant un manche de fixation et une pastille d'usinage à sec, ladite pastille comprenant une face de travail, ledit procédé étant caractérisé en ce que ladite pastille est en un matériau de dureté élevée, c'est-à-dire de dureté au moins égale à 10 sur l'échelle de Mohs, en ce que les déchets d'usinages sont évacués par aspiration à proximité de ladite pastille, et en ce que ledit outil est placé par rapport audit contact de telle sorte que ladite face de travail est inclinée d'un angle β, dit "angle de coupe", vers l'avant par rapport au sens de rotation dudit contact, l'angle β étant de préférence compris entre 3° et 12°, et de préférence encore compris entre 5° et 10°, et de telle sorte que ledit manche est incliné d'un angle δ vers l'arrière par rapport audit sens de rotation, l'angle δ étant de préférence compris entre 5° et 10°.According to the invention, the method of rectifying a rotary contact of an electric machine, said rotary contact being fixed to the rotor of said machine, comprises the installation of a rectification device, the rotational drive of said rotor, so as to produce a rotary movement of said contact, and the machining of said rotary contact using said device, said device comprising a grinding tool and a turning means of said tool, said tool comprising a fixing handle and a pad of dry machining, said pellet comprising a working face, said method being characterized in that said pellet is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that the machining waste is evacuated by suction near said pad, and in that said tool is placed relative to said contact so that said working face is inclined at an ang the β, called "cutting angle", towards the front with respect to the direction of rotation of said contact, the angle β preferably being between 3 ° and 12 °, and more preferably still between 5 ° and 10 °, and such that said handle is inclined at an angle δ rearward with respect to said direction of rotation, the angle δ preferably being between 5 ° and 10 °.
Les angles β et δ sont tels que l'usinage produit des déchets de coupe de dimensions suffisamment faibles pour être facilement aspirés et évacués par ladite aspiration et tels que l'usinage n'entraîne pas de morsure ou pénétration du métal.The angles β and δ are such that the machining produces cutting waste of sufficiently small dimensions to be easily sucked in and discharged by said suction and such that the machining does not cause biting or penetration of the metal.
L'invention a également pour objet un outil de rectification qui permet de mettre en œuvre le procédé de rectification de l'invention. L'outil de rectification selon l'invention comprend un manche de fixation et une pastille d'usinage, ladite pastille comprenant une face de travail, et est caractérisé en ce que ladite pastille est en un matériau de dureté élevée, c'est-à-dire de dureté au moins égale à 10 sur l'échelle de Mohs, en ce que ladite face de travail est inclinée vers le haut d'un angle vertical α par rapport à l'axe principal dudit manche, de préférence compris entre 8° et 22°, et de préférence encore compris entre 10° et 20°, et en ce qu'il comprend des moyens d'aspiration et d'évacuation des déchets d'usinage permettant de produire une zone d'aspiration à proximité de ladite pastille d'usinage. The invention also relates to a rectification tool which makes it possible to implement the rectification method of the invention. The grinding tool according to the invention comprises a fixing handle and a machining pad, said pad comprising a working face, and is characterized in that said pad is made of a material of high hardness, that is to say -d say hardness at least equal to 10 on the Mohs scale, in that said working face is inclined upward by a vertical angle α relative to the main axis of said handle, preferably between 8 ° and 22 °, and preferably still between 10 ° and 20 °, and in that it comprises means for aspiration and evacuation of machining waste making it possible to produce a suction area near said pellet machining .
L'invention a aussi pour objet un dispositif de rectification permettant de mettre en œuvre le procédé de rectification de l'invention. The invention also relates to a rectification device making it possible to implement the rectification method of the invention .
Le dispositif de rectification d'un contact rotatif selon l'invention comprend un bâti, un outil d'usinage à sec, comprenant un manche de fixation et une pastille d'usinage, et des moyens de fixation et de chariotage dudit outil, et est caractérisé en ce que ledit bâti permet de monter ledit outil de telle sorte que ledit manche est incliné vers l'arrière par rapport au sens de rotation dudit contact d'un angle δ de préférence compris entre 5° et 10°, et de telle sorte que la face de travail est inclinée vers l'avant par rapport audit sens de rotation d'un l'angle β, dit angle de coupe, de préférence compris entre 3° et 12°, et de préférence encore compris entre 5° et 10°, et en ce qu'il comprend des moyens d'aspiration et d'évacuation des déchets d'usinages produits à proximité de ladite pastille.The grinding device of a rotary contact of the invention comprises a frame, a dry machining tool, comprising a coupling sleeve and a processing wafer, and means of attachment and f i of turning operation of said tool, and is characterized in that said frame to mount said handle such that said tool is inclined towards the era arr i relative to the direction of rotation of said contact at an angle δ preferably between 5 ° and 10 °, and in such a way that the working face is inclined forwards with respect to said direction of rotation by an angle β, called the cutting angle, preferably between 3 ° and 12 °, and more preferably between 5 ° and 10 °, and in that it comprises means of suction and evacuation of the machining waste produced near said pellet.
Description des figuresDescription of the figures
La figure 1 montre, de manière schématique, un dispositif de rectification ( 1) de contacts rotatifs de machines électriques selon l'art antérieur monté sur une tête de machine électrique, (a) en vue de côté et (b) en vue axiale selon le plan de coupe AA' (b). Le dispositif de rectification (1) de l'art antérieur comprend typiquement un bâti (2), qui est monté dans la tête de la machine (21), des moyens de fixation (4) et des moyens de déplacement et de chariotage (5) d'un outil d'usinage à sec (3), et un moyen auxiliaire, tel qu'un moteur auxiliaire, pour entraîner la machine et mettre ainsi en rotation le contact rotatif (20) à rectifier. Le dispositif de rectification est généralement fixé à la machine à l'aide de l'axe de fixation (6) des porte-balais (7). La combinaison du mouvement de rotation du contact rotatif (S) et des déplacements axiaux (D) de l'outil obtenus à l'aide du moyen de chariotage assure une rectification de toute la surface du contact rotatif.Figure 1 shows, schematically, a rectification device (1) of rotary contacts of electric machines according to the prior art mounted on an electric machine head, (a) in side view and (b) in axial view according to the section plane AA ' (b). The rectification device (1) of the prior art typically comprises a frame (2), which is mounted in the head of the machine (21), fixing means (4) and displacement and turning means (5 ) a dry machining tool (3), and an auxiliary means, such as an auxiliary motor, for driving the machine and thus rotating the rotary contact (20) to be rectified. The grinding device is generally fixed to the machine using the fixing pin (6) of the brush holders (7). The combination of the rotational movement of the rotary contact (S) and the axial displacements (D) of the tool obtained using the turning means ensures rectification of the entire surface of the rotary contact.
La figure 2 illustre, de manière schématique, un dispositif de rectification de contacts rotatifs de machines électriques selon l'invention, vu dans l'axe de la machine.FIG. 2 schematically illustrates a device for rectifying rotary contacts of electric machines according to the invention, seen in the axis of the machine.
La figure 3 définit les angles relatifs à l'orientation de l'outil de coupe et à la face de travail de la pastille d'usinage selon l'invention.FIG. 3 defines the angles relative to the orientation of the cutting tool and to the working face of the machining pad according to the invention.
La figure 4 illustre l'outil de coupe selon un mode de réalisation préféré de l'invention, vu de côté (a) et vu du dessus (b).FIG. 4 illustrates the cutting tool according to a preferred embodiment of the invention, seen from the side (a) and seen from above (b).
La figure 5 illustre une fraise à collecteur destinée à l'abaissement des micas et de la résine servant à la rectification des collecteurs selon l'invention.FIG. 5 illustrates a collector milling cutter intended for lowering the micas and the resin used for the rectification of the collectors according to the invention.
Description détaillée de l'inventionDetailed description of the invention
Selon l'invention, le procédé de rectification d'un contact rotatif (20) de machine électrique (23), ledit contact rotatif étant fixé au rotor (22) de la machine, comprend la mise en place d'un dispositif de rectification (1, 10), l'entraînement en rotation du rotor (22), et l'usinage du contact (20) à l'aide du dispositif ( 1 , 10), ledit dispositif comprenant un outil de rectification (13) et un moyen de chariotage dudit outil, ledit outil comprenant un manche de fixation (32) et une pastille d'usinage à sec (34), ladite pastille comprenant une face de travail (35), ledit procédé étant caractérisé en ce que ladite pastille (34) est en un matériau de dureté élevée, c'est-à-dire de dureté au moins O 00/16945According to the invention, the method for rectifying a rotary contact (20) of an electric machine (23), said rotary contact being fixed to the rotor (22) of the machine, comprises the installation of a rectification device ( 1, 10), the rotation drive of the rotor (22), and the machining of the contact (20) using the device (1, 10), said device comprising a grinding tool (13) and a means for turning said tool, said tool comprising a fixing handle (32) and a dry machining pad (34), said pad comprising a working face (35), said method being characterized in that said pad (34) is made of a material with high hardness, i.e. at least hardness O 00/16945
6 égale à 10 sur l'échelle de Mohs, en ce que les déchets d'usinages sont évacués par aspiration à proximité de la pastille (34), et en ce que l'outil (13) est placé par rapport au contact (20) de telle sorte que la face de travail (35), qui définit un plan P, est inclinée d'un angle β, dit "angle de coupe", vers l'avant par rapport au sens de rotation (S) du contact (20) et de telle sorte que ledit manche (32) est incliné d'un angle δ vers l'arrière par rapport audit sens de rotation (S), les angles étant mesurés par rapport au rayon R dudit contact.6 equal to 10 on the Mohs scale, in that the machining waste is evacuated by suction near the pellet (34), and in that the tool (13) is placed relative to the contact (20 ) so that the working face (35), which defines a plane P, is inclined by an angle β, called "cutting angle", towards the front relative to the direction of rotation (S) of the contact ( 20) and such that said handle (32) is inclined at an angle δ rearward with respect to said direction of rotation (S), the angles being measured with respect to the radius R of said contact.
L'angle δ peut être mesuré entre l'axe longitudinal (31) du manche (32) - ou un axe parallèle (310) passant par le point de contact entre la pastille et le contact rotatif- et le rayon R du contact.The angle δ can be measured between the longitudinal axis (31) of the handle (32) - or a parallel axis (310) passing through the point of contact between the pad and the rotary contact - and the radius R of the contact.
Ledit matériau de dureté élevée est de préférence un diamant. La pastille d'usinage (34) peut être fixée à l'outil (30) par l'intermédiaire d'une plaquette d'usinage (33). De préférence, l'angle γ entre l'axe (31) du manche et le plan avant (Q) de la pastille (34) est inférieur à 100°, de manière à ne pas gêner le positionnement de la pastille (34) par rapport au contact (20).Said high hardness material is preferably a diamond. The machining pad (34) can be fixed to the tool (30) via a machining plate (33). Preferably, the angle γ between the axis (31) of the handle and the front plane (Q) of the pad (34) is less than 100 °, so as not to hinder the positioning of the pad (34) by report to contact (20).
L'angle de coupe β est faible, et de préférence compris entre 3° et 12°, et de préférence encore compris entre 5° et 10°. D'une part, un angle de coupe trop incliné vers l'avant augmenterait les risques de morsure dans le métal de manière rédhibitoire. D'autre part, un angle de coupe trop important réduirait la quantité de métal enlevée par la passe d'usinage et augmenterait inutilement le nombre de passes, et par conséquent la longueur de l'intervention.The cutting angle β is small, and preferably between 3 ° and 12 °, and more preferably between 5 ° and 10 °. On the one hand, a cutting angle that is tilted too far forward would increase the risk of biting into the metal in an unacceptable way. On the other hand, too large a cutting angle would reduce the amount of metal removed by the machining pass and unnecessarily increase the number of passes, and therefore the length of the intervention.
De préférence, ladite aspiration forme une zone de d'aspiration confinée à proximité de la pastille (34), de manière à canaliser efficacement les déchets d'usinage, à limiter leur dispersion et à augmenter l'efficacité de l'aspiration. Ce confinement est avantageusement obtenu à l'aide de moyens tels qu'un manchon ou un capotage, ces moyens étant de préférence en matériau électriquement isolant. O 00/16945Preferably, said suction forms a confined suction zone near the pellet (34), so as to efficiently channel the machining waste, to limit its dispersion and to increase the efficiency of the suction. This confinement is advantageously obtained using means such as a sleeve or a cover, these means preferably being made of electrically insulating material. O 00/16945
La demanderesse a constaté avec surprise que l'utilisation combinée d'un matériau de grande dureté pour effectuer la rectification du contact rotatif, d'une faible inclinaison vers l'avant de la pastille d'usinage et d'une faible inclinaison vers l'arrière du manche de l'outil permet de réaliser la rectification de manière rapide et très fiable, avec une grande précision et sans détérioration du contact, tout en éliminant les efficacement les déchets d'usinage. La pastille de dureté élevée offre un taux d'usure en cours d'usinage qui est suffisamment faible pour qu'il ne soit pas nécessaire d'avancer ledit outil à chaque passe et de pénétrer profondément dans la matière à usiner. L'invention permet ainsi de produire des déchets de petite taille qui sont faciles à évacuer par des moyens d'aspiration de petites dimensions et de réaliser la rectification à grande vitesse, sans entraîner de morsures intempestives de la surface du contact par la pastille d'usinage lorsque le bâti fléchit ou se déforme en cours de rectification, ce qui évite de défoncer le contact et de l'endommager irrémédiablement. Il semble que l'inclinaison de l'outil (30) produise un effet de ressort qui limite sensiblement la prise dans le métal en cas de flexion du dispositif de rectification et diminue ainsi les risques de morsures.The Applicant has surprisingly found that the combined use of a material of great hardness to perform the rectification of the rotary contact, of a slight inclination towards the front of the machining pad and of a slight inclination towards the back of the tool handle allows grinding to be carried out quickly and very reliably, with high precision and without deterioration of the contact, while effectively eliminating machining waste. The high hardness pad offers a wear rate during machining which is sufficiently low that it is not necessary to advance said tool with each pass and to penetrate deeply into the material to be machined. The invention thus makes it possible to produce small waste which is easy to evacuate by means of suction of small dimensions and to carry out the rectification at high speed, without causing untimely bites of the contact surface by the pad. machining when the frame bends or deforms during grinding, which avoids breaking the contact and damaging it irreparably. It seems that the inclination of the tool (30) produces a spring effect which appreciably limits the grip in the metal in the event of bending of the grinding device and thus reduces the risks of bites.
Selon une mode de réalisation préféré du procédé de rectification de l'invention, la face de travail (35) est inclinée vers le haut d'un angle vertical α, qui est de préférence compris entre 8° et 22°, par rapport à l'axe (31) du manche (32) de l'outil (30), et l'angle de coupe β est obtenu en inclinant le manche (32) par rapport au rayon R du contact (20) d'un angle vertical δ compris entre 5° et 10°. L'angle α correspond ainsi à la somme des angles β et δ. Lorsque l'angle α est trop faible, la face de travail (35) se rapproche de la verticale par rapport à la surface du contact (20) et la tolérance à la flexion du dispositif de rectification diminue fortement. Lorsque l'angle α est trop grand, le support dudit dispositif est soumis à des efforts en torsion trop importants.According to a preferred embodiment of the rectification method of the invention, the working face (35) is inclined upwards by a vertical angle α, which is preferably between 8 ° and 22 °, relative to the axis (31) of the handle (32) of the tool (30), and the cutting angle β is obtained by tilting the handle (32) relative to the radius R of the contact (20) by a vertical angle δ between 5 ° and 10 °. The angle α thus corresponds to the sum of the angles β and δ. When the angle α is too small, the working face (35) approaches the vertical with respect to the surface of the contact (20) and the bending tolerance of the rectification device greatly decreases. When the angle α is too large, the support of said device is subjected to excessive torsional forces.
L'outil de rectification (130) selon l'invention comprend un manche de fixation (132), une partie arrière (141), une partie avant (140), et une pastille d'usinage à sec (134) fixée sur ladite partie avant et comprenant une face de travail (135), ledit outil étant caractérisé en ce que la pastille (134) est en un matériau de dureté élevée, c'est-à-dire de dureté au moins égale à 10 sur l'échelle de Mohs, en ce que la face de travail (135) est inclinée vers le haut d'un angle vertical α, par rapport à l'axe principal (131) du manche (132) - ou par rapport à un axe parallèle (1310) passant par le point de contact entre la pastille (34) et le contact rotatif (20) -, qui est de préférence compris entre 8° et 22°, et de préférence encore compris entre 10° et 20°, et en ce qu'il comprend des moyens d'aspirations et d'évacuation des déchets d'usinage à proximité de la pastille d'usinage (134), lesdits moyens d'aspiration et d'évacuation produisant une zone d'aspiration à proximité de la pastille de l'outil.The grinding tool (130) according to the invention comprises a fixing handle (132), a rear part (141), a front part (140), and a dry machining pad (134) fixed on said part. front and comprising a working face (135), said tool being characterized in that the pad (134) is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that the working face (135) is inclined upwards by a vertical angle α, relative to the main axis (131) of the handle (132 ) - or relative to a parallel axis (1310) passing through the point of contact between the pad (34) and the rotary contact (20) -, which is preferably between 8 ° and 22 °, and more preferably still included between 10 ° and 20 °, and in that it comprises means for aspirating and evacuating machining waste near the machining pad (134), said means for aspirating and evacuating producing a suction area near the tool pad.
Ledit matériau de dureté élevée est de préférence un diamant. La pastille d'usinage (134) peut être fixée à l'outil (130) par l'intermédiaire d'une plaquette d'usinage (133). La plaquette (133) est fixée fermement à l'outil à l'aide d'un moyen de fixation (1331), tel qu'un boulon. De préférence, l'angle γ entre l'axe (131) du manche et le plan avant (Q) de la pastille (134) est inférieur à 100°, de manière à ne pas gêner le positionnement de la pastille (134) par rapport au contact (20). Le plan avant (Q) de la pastille (134) est de préférence légèrement en retrait par rapport à l'extrémité avant (142) de l'outil, c'est-à-dire que ladite extrémité est légèrement proéminente, de manière à offrir un support mécanique suffisant et éviter, notamment, des efforts de cisaillement trop importants sur ladite pastille.Said high hardness material is preferably a diamond. The machining pad (134) can be attached to the tool (130) via a machining pad (133). The insert (133) is firmly attached to the tool using a fastening means (1331), such as a bolt. Preferably, the angle γ between the axis (131) of the handle and the front plane (Q) of the pad (134) is less than 100 °, so as not to hinder the positioning of the pad (134) by report to contact (20). The front plane (Q) of the pad (134) is preferably slightly set back relative to the front end (142) of the tool, that is to say that said end is slightly prominent, so as to offer sufficient mechanical support and avoid, in particular, excessive shearing forces on said pellet.
Selon un mode de réalisation préféré de l'invention, lesdits moyens d'aspiration et d'évacuation comprennent une canalisation (137) intégrée au manche (132), de préférence sensiblement dans l'axe longitudinal (131) du manche, ladite canalisation comprenant au moins une entrée d'aspiration (136) à proximité de la pastille d'usinage (134) et au moins une sortie (138) munie de moyens de fixation (139) à un système extérieur d'aspiration et d'évacuation des déchets d'usinage. Lesdits moyens d'aspiration créent une zone d'aspiration efficace dans le voisinage de la pastille d'usinage. Selon une variante avantageuse de ce mode de réalisation préféré, illustrée à la figure 4, la canalisation (137) comprend un canal principal (1371) sortant sur la partie arrière (141) du manche (132), c'est-à-dire débouchant à l'extrémité du manche la plus éloignée de la plaquette d'usinage, et trois entrées (1361, 1362, 1363) situées à proximité, et distribuées autour, de la pastille d'usinage : une entrée, dite entrée supérieure (1363), est située sur le dessus du manche et les deux autres entrées, dites entrées latérales (1361, 1362) sont situées de part et d'autre du manche. La ou les sorties situées à proximité de la plaquette d'usinage ont avantageusement un forme qui favorise une canalisation et une aspiration efficaces des déchets d'usinage, telle qu'une forme de buse conique.According to a preferred embodiment of the invention, said suction and evacuation means comprise a pipe (137) integrated into the handle (132), preferably substantially in the longitudinal axis (131) of the handle, said pipe comprising at least one suction inlet (136) near the machining pad (134) and at least one outlet (138) provided with fixing means (139) to an external suction and waste evacuation system machining. Said suction means create an effective suction zone in the vicinity of the machining pad. According to an advantageous variant of this preferred embodiment, illustrated in FIG. 4, the pipe (137) comprises a main channel (1371) exiting on the rear part (141) of the handle (132), that is to say opening at the end of the handle furthest from the machining insert, and three inlets (1361, 1362, 1363) located at proximity, and distributed around, of the machining pad: an entry, called upper entry (1363), is located on the top of the handle and the other two entries, said side entries (1361, 1362) are located on both sides other from the handle. The outlet or outlets located near the machining insert advantageously have a shape which promotes efficient channeling and aspiration of the machining waste, such as a conical nozzle shape.
Lorsque l'entraînement est réalisé sous tension, comme c'est notamment le cas avec les alimentations auxiliaires, il est avantageux de munir l'outil (130) de moyens d'isolation électrique, de manière à éliminer les risques électriques, notamment la formation de courts-circuits au droit de la plaquette d'usinage qui risqueraient d'endommager la surface du collecteur. Dans ce but, un ou plusieurs côtés du manche (132) de l'outil (130) peuvent être revêtus, en tout ou partie, de pièces en matériau électriquement isolant, telles que des plaquettes isolantes (16).When the drive is carried out under voltage, as is notably the case with the auxiliary power supplies, it is advantageous to provide the tool (130) with electrical isolation means, so as to eliminate the electrical risks, in particular training short circuits to the right of the machining insert which could damage the surface of the collector. For this purpose, one or more sides of the handle (132) of the tool (130) may be coated, in whole or in part, with parts made of electrically insulating material, such as insulating plates (16).
Selon l'invention, le dispositif de rectification (10) comprend un bâti (12), un outil d'usinage à sec (13), comprenant un manche de fixation (32), une partie avant (40) et une partie arrière (41), la partie avant (40) comprenant une pastille d'usinage (34), le bâti (12) comprenant au moins un moyen de fixation (14) et des moyens de chariotage et de déplacement vertical (15) dudit outil, la pastille (34) comprenant une face de travail (35), et est caractérisé en ce que le bâti (12) permet de monter l'outil (13) de telle sorte que l'axe principal (31) du manche (32) est incliné vers l'arrière par rapport au sens de rotation (S) du contact (20) d'un angle vertical δ de préférence compris entre 5° et 10°, et de telle sorte que la face de travail (35) de la pastille (34) est incliné vers l'avant d'un angle β par rapport audit sens de rotation, de préférence compris entre 3° et 12°, et de préférence encore compris entre 5° et 10°, et en ce qu'il comprend des moyens d'aspiration et d'évacuation des déchets d'usinages produits à proximité de la pastille (34) de l'outil (13).According to the invention, the rectification device (10) comprises a frame (12), a dry machining tool (13), comprising a fixing handle (32), a front part (40) and a rear part ( 41), the front part (40) comprising a machining pad (34), the frame (12) comprising at least one fixing means (14) and means of turning and vertical displacement (15) of said tool, the pad (34) comprising a working face (35), and is characterized in that the frame (12) allows the tool (13) to be mounted so that the main axis (31) of the handle (32) is inclined backwards with respect to the direction of rotation (S) of the contact (20) by a vertical angle δ preferably between 5 ° and 10 °, and so that the working face (35) of the pad (34) is inclined towards the front by an angle β relative to said direction of rotation, preferably between 3 ° and 12 °, and more preferably still between 5 ° and 10 °, and in that it comprises means suction and discharge of machining waste produced near the pad (34) of the tool (13).
Le bâti (12) est généralement fixé à la tête (21) de la machine à l'aide d'un des axes de fixation (6) des porte-balais (7). Dans ce cas, le bâti (12) est de préférence fixé à l'un des axes de fixation (6) des porte-balais par l'intermédiaire d'un support (11). Le support de bâti (11) permet un réglage de l'inclinaison du bâti et de l'outil et maintient le bâti fixement en place lors des opérations de rectification. Le support de bâti (11) peut être adapté à chaque type de machine, de manière à faciliter la mise en place et le positionnement du bâti et de l'outil.The frame (12) is generally fixed to the head (21) of the machine using one of the fixing pins (6) of the brush holders (7). In this case, the frame (12) is preferably fixed to one fixing pins (6) of the brush holders by means of a support (11). The frame support (11) allows the inclination of the frame and the tool to be adjusted and keeps the frame fixed in place during grinding operations. The frame support (11) can be adapted to each type of machine, so as to facilitate the positioning and positioning of the frame and the tool.
Selon un mode de réalisation préféré de l'invention, illustré à la figure 2, le bâti (12) comprend un corps de bâti (121) qui peut se fixer au support (11) et qui est muni des dits moyens de fixation (14), de chariotage et de déplacement (15) de l'outil. Lesdits moyens comprennent de préférence un chariot (155), une vis à crémaillère (151), un support à glissement axial (152), un support à glissement vertical (153) manœuvrable à l'aide d'un moyen manuel (154), tel qu'une manivelle, et des moyens de fixation (14), tels qu'un boulon. Lesdits moyens d'aspiration et d'évacuation des déchets d'usinages sont de préférence intégrés à l'outil (13), de telle sorte qu'au moins une entrée d'aspiration (36) débouche à proximité de la pastille (34) de l'outil (13) et qu'au moins un conduit d'évacuation (17) fixé à l'arrière de l'outil (13) évacue les déchets (E) à l'aide d'un système d'aspiration et d'évacuation extérieur. L'intégration des moyens d'aspiration et d'évacuation des déchets d'usinage permet de limiter considérablement l'encombrement du dispositif.According to a preferred embodiment of the invention, illustrated in FIG. 2, the frame (12) comprises a frame body (121) which can be fixed to the support (11) and which is provided with said fixing means (14 ), turning and moving (15) of the tool. Said means preferably comprise a carriage (155), a rack screw (151), an axial sliding support (152), a vertical sliding support (153) which can be operated using manual means (154), such as a crank, and fixing means (14), such as a bolt. Said means of suction and discharge of machining waste are preferably integrated into the tool (13), so that at least one suction inlet (36) opens near the pellet (34) of the tool (13) and that at least one evacuation duct (17) fixed to the rear of the tool (13) evacuates the waste (E) using a suction system and outside evacuation. The integration of the suction and evacuation means of machining waste makes it possible to considerably limit the size of the device.
Avantageusement, la partie avant (40) de l'outil (13) est munie de moyens de confinement (18), tels qu'un manchon ou un capotage, qui permettent de canaliser efficacement les déchets d'usinage vers la ou les entrées (36) et de limiter leur dispersion hors de la zone d'aspiration produite par lesdits moyens d'aspiration. Les moyens de confinement (18) sont de préférence en matériau isolant électrique, de manière à éviter la formation éventuelle de courts-circuits par l'intermédiaire des déchets d'usinages métalliques.Advantageously, the front part (40) of the tool (13) is provided with confinement means (18), such as a sleeve or a cover, which make it possible to efficiently channel the machining waste towards the inlet (s) ( 36) and to limit their dispersion outside the suction zone produced by said suction means. The confinement means (18) are preferably made of electrical insulating material, so as to avoid the possible formation of short circuits by means of metal machining waste.
Lorsque l'entraînement est réalisé sous tension, comme c'est notamment le cas avec les alimentations auxiliaires, l'outil (13) est alors isolé électriquement du bâti (12), de manière à éliminer les risques électriques, notamment la formation de courts-circuits au droit de la pastille d'usinage qui risqueraient d'endommager la surface du collecteur. Cette isolation électrique est avantageusement obtenue en munissant un ou plusieurs côtés du manche de l'outil (13) de pièces en matériau électriquement isolant, telles que des plaquettes isolantes (16), de préférence intercalées entre les moyens de fixation (14) et l'outil. Les plaquettes isolantes peuvent également être fixées à l'outil, ce qui facilite la mise en place de l'outil.When the drive is carried out under voltage, as is notably the case with the auxiliary power supplies, the tool (13) is then electrically isolated from the frame (12), so as to eliminate electrical risks, in particular the formation of short -circuits to the right of the machining pad which could damage the surface of the manifold. This electrical insulation is advantageously obtained by providing one or more sides of the handle of the tool (13) with pieces of electrically insulating material, such as insulating plates (16), preferably inserted between the fixing means (14) and the 'tool. The insulating pads can also be fixed to the tool, which facilitates the positioning of the tool.
Pour la rectification des collecteurs, il est nécessaire d'effectuer un entraînement du rotor (22), qui peut être obtenu par tout moyen connu. L'entraînement est avantageusement réalisé à l'aide d'alimentations auxiliaires basse tension, c'est-à-dire capables de délivrer des tensions inférieures à 40 V, dont l'intensité est juste suffisante pour entraîner la rotation du moteur. L'utilisation d'une faible tension réduit sensiblement les risques électriques pour l'opérateur et pour les appareils, et limite considérablement l'importance de l'endommagement de la surface du collecteur produit par d'éventuels courts-circuits en cours de rectification.For the rectification of the collectors, it is necessary to carry out a drive of the rotor (22), which can be obtained by any known means. The drive is advantageously carried out using low voltage auxiliary power supplies, that is to say capable of delivering voltages below 40 V, the intensity of which is just sufficient to cause the rotation of the motor. The use of a low voltage significantly reduces the electrical risks for the operator and for the devices, and considerably limits the extent of damage to the surface of the collector produced by possible short circuits during rectification.
Lesdites alimentations auxiliaires sont raccordées à une source de courant monophasé ou triphasé, selon la puissance demandée pour l'entraînement du moteur. Le courant est de préférence redressé, puis haché en haute fréquence, c'est-à-dire à une fréquence supérieure à 1000 Hz, ce qui permet une régulation fine de l'intensité du courant et donc de la vitesse angulaire du moteur entraîné en rotation par ce courant. La basse tension est de préférence obtenue à l'aide d'un transformateur intégré aux dites alimentations, de sorte que le moteur peut être isolé électriquement du réseau. Lesdites alimentations comprennent avantageusement une commande déportée permettant à l'opérateur de commander à distance la tension à délivrer. La configuration précise de ces alimentations varient selon le type de moteurs, sa puissance nominale et le type d'entraînement. Il est avantageux d'utiliser une première alimentation auxiliaire pour l'excitation et une seconde alimentation auxiliaire, plus puissante pour l'induit, c'est-à-dire de puissance suffisante pour entraîner la rotation en cours d'usinage.Said auxiliary power supplies are connected to a single-phase or three-phase current source, depending on the power required for driving the motor. The current is preferably rectified, then chopped at high frequency, that is to say at a frequency greater than 1000 Hz, which allows fine regulation of the intensity of the current and therefore of the angular speed of the motor driven in rotation by this current. The low voltage is preferably obtained using a transformer integrated into said power supplies, so that the motor can be electrically isolated from the network. Said power supplies advantageously include a remote control allowing the operator to remotely control the voltage to be delivered. The precise configuration of these supplies varies according to the type of motor, its nominal power and the type of drive. It is advantageous to use a first auxiliary power supply for the excitation and a second, more powerful auxiliary power supply for the armature, that is to say of sufficient power to drive the rotation during machining.
Dans le cas des collecteurs, le procédé de rectification peut comprendre également des opérations d'abaissement des micas et résines situés entre les lames et de cassage 00/16945In the case of collectors, the rectification process can also include operations of lowering the micas and resins located between the blades and breaking 00/16945
12 ou fraisage des arêtes des lames. Ces opérations d'abaissement et de cassage des angles sont aussi des opérations longues qui, de surcroît, nécessitent l'emploi de deux outils différents, à savoir une fraise à micas pour réduire leur hauteur et une lame taillée en biseau pour ébavurer les arêtes des lames.12 or milling of the edges of the blades. These operations of lowering and breaking the angles are also long operations which, moreover, require the use of two different tools, namely a micas cutter to reduce their height and a bevel cut blade to deburr the edges of the blades.
Selon l'invention, pour ces opérations, il est avantageux d'utiliser une fraise à collecteur (50) comprenant une mini-perceuse dans un manche (58) munie d'un renvoi d'angle (51), d'un disque de fraisage mixte (53), fixé à l'arbre (59) du renvoi d'angle (51) à l'aide d'un moyen de fixation (57), et d'au moins deux anneaux de support (54, 55) permettant de maintenir le disque (53) à une distance calibrée par rapport aux lames (201) du collecteur (200). Le disque mixte (53) comprend un disque central (531) de diamètre Dl saupoudré de poussière de diamant (533) sur sa périphérie, ce qui permet l'abrasion des résines et micas (202), et, de part et d'autre, deux fraises coniques (532, 534), de diamètre D2 inférieur à Dl, munies de dents destinées au fraisage des arêtes des lames (201). Les anneaux de support (54, 55) sont attachés de part et d'autre du disque mixte (53) et reposent sur le collecteur (200) lors du fraisage afin de régler la profondeur de fraisage. Avantageusement, un des anneaux (55) est placé autour du renvoi d'angle (51) et l'autre anneau (54) est soutenu par un bras (56) fixé au manche (58) à l'aide d'un moyen de fixation (52). Les anneaux (54, 55) sont de préférence en chrome de manière à réduire le coefficient de friction entre les anneaux et les lames du collecteur et à faciliter le déplacement de la fraise à micas.According to the invention, for these operations, it is advantageous to use a collector cutter (50) comprising a mini-drill in a handle (58) provided with an angle gear (51), a disc of mixed milling (53), fixed to the shaft (59) of the bevel gear (51) using a fixing means (57), and at least two support rings (54, 55) allowing the disc (53) to be kept at a calibrated distance from the blades (201) of the collector (200). The mixed disc (53) comprises a central disc (531) of diameter Dl sprinkled with diamond dust (533) on its periphery, which allows the abrasion of resins and micas (202), and, on both sides , two conical burs (532, 534), of diameter D2 less than Dl, provided with teeth intended for milling the edges of the blades (201). The support rings (54, 55) are attached on either side of the mixed disc (53) and rest on the collector (200) during milling in order to adjust the milling depth. Advantageously, one of the rings (55) is placed around the bevel gear (51) and the other ring (54) is supported by an arm (56) fixed to the handle (58) using a means of fixing (52). The rings (54, 55) are preferably made of chrome so as to reduce the coefficient of friction between the rings and the blades of the collector and to facilitate the movement of the micas cutter.
EssaisEssays
Des opérations de rectification ont été réalisées, selon l'art antérieur et selon l'invention, sur des moteurs de 2,5 MW. Pour les essais selon l'invention, le dispositif et l'outil de rectification étaient très semblables à ceux illustrés aux figures 2 à 4. Les angles δ égal à 7,5° et l'angle β égal à 7,5° (l'angle α était égal à 15°).Rectification operations were carried out, according to the prior art and according to the invention, on 2.5 MW motors. For the tests according to the invention, the device and the rectification tool were very similar to those illustrated in FIGS. 2 to 4. The angles δ equal to 7.5 ° and the angle β equal to 7.5 ° (l angle α was 15 °).
La rectification complète d'un moteur, selon l'invention, a pu être réalisée en 2 heures environ, alors qu'elle prend typiquement 24 heures selon l'art antérieur Dans certains cas, l'abaissement des micas et de la résine s'était avéré nécessaire. Cette opération a été effectuée à l'aide d'une fraise à collecteur similaire à celle illustrée à la figure 5. Cette étape supplémentaire a pu être réalisée en 3 heures en moyenne, alors qu'elle requiert environ 10 heures avec les moyens de l'art antérieur. The complete rectification of an engine according to the invention could be carried out in approximately 2 hours, whereas it typically takes 24 hours according to the prior art In some cases, it was necessary to lower the micas and the resin . This operation was carried out using a collector cutter similar to that illustrated in FIG . 5 . This additional step could be carried out in 3 hours on average, whereas it requires approximately 10 hours with the means of the prior art .
Il a été observé que la taille des déchets d'usinage n'excédait pas 500 μm environ. Aucun déchet d'usinage n'a été trouvé sur la surface du collecteur suite à l'opération de rectification.It has been observed that the size of the machining waste does not exceed approximately 500 μm . No machining waste was found on the surface of the collector following the rectification operation.
AvantagesBenefits
L'invention s'adapte aisément à l'ensemble des machines électriques connues et sont d'une mise en œuvre aisée.The invention adapts easily to all known electrical machines and are of easy implementation.
Le dispositif de rectification selon l'invention permet la rectification en milieu confiné grâce à sa compacité. The rectification device according to the invention allows rectification in a confined environment thanks to its compactness.

Claims

00/1694514 REVENDICATIONS 00/1694514 CLAIMS
1. Procédé de rectification d'un contact rotatif d'une machine électrique, ledit contact rotatif étant fixé au rotor de ladite machine, ledit procédé comprenant la mise en place d'un dispositif de rectification, l'entraînement en rotation dudit rotor, de manière à produire un mouvement rotatif dudit contact, et l'usinage dudit contact rotatif à l'aide dudit dispositif, ledit dispositif comprenant un outil de rectification et un moyen de chariotage dudit outil, ledit outil comprenant un manche de fixation et une pastille d'usinage à sec, ladite pastille comprenant une face de travail, ledit procédé étant caractérisé en ce que ladite pastille est en un matériau de dureté élevée, c'est-à-dire de dureté au moins égale à 10 sur l'échelle de Mohs, en ce que les déchets d'usinages sont évacués par aspiration à proximité de ladite pastille, et en ce que ledit outil est placé par rapport au dit contact de telle sorte que ladite face de travail de ladite pastille est inclinée d'un angle β, dit "angle de coupe", vers l'avant par rapport au sens de rotation dudit contact, l'angle β étant compris entre 3° et 12°, et de telle sorte que ledit manche est incliné d'un angle δ vers l'arrière par rapport audit sens de rotation, l'angle δ étant compris entre 5° et 10°.1. Method for rectifying a rotary contact of an electric machine, said rotary contact being fixed to the rotor of said machine, said method comprising the installation of a rectification device, the rotational drive of said rotor, so as to produce a rotary movement of said contact, and the machining of said rotary contact using said device, said device comprising a grinding tool and a turning means of said tool, said tool comprising a fixing handle and a pad of dry machining, said pellet comprising a working face, said method being characterized in that said pellet is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that the machining waste is evacuated by suction near said pad, and in that said tool is placed relative to said contact so that said working face of said pad is inclined by an angle β, called "cutting angle", towards the front relative to the direction of rotation of said contact, the angle β being between 3 ° and 12 °, and so that said handle is inclined by an angle δ backwards with respect to said direction of rotation, the angle δ being between 5 ° and 10 °.
2. Procédé de rectification selon la revendication 1, caractérisé en ce que ledit matériau de dureté élevée est du diamant.2. A rectification method according to claim 1, characterized in that said material of high hardness is diamond.
3. Procédé selon l'une des revendications 1 et 2, caractérisé en ce que ledit angle de coupe β est compris entre 5° et 10°.3. Method according to one of claims 1 and 2, characterized in that said cutting angle β is between 5 ° and 10 °.
Procédé selon l'une des revendications 1 à 3, caractérisé en ce que ladite aspiration forme une zone de d'aspiration confinée à proximité de ladite pastille, de manière à canaliser efficacement les déchets d'usinage, à limiter leur dispersion et à augmenter l'efficacité de l'aspiration. Method according to one of claims 1 to 3, characterized in that said suction forms a confined suction zone near said pellet, so as to effectively channel the machining waste, to limit its dispersion and to increase the efficiency of suction.
5. Procédé selon la revendication 4, caractérisé en ce que ledit confinement est obtenu à l'aide d'un moyen tel qu'un manchon ou un capotage.5. Method according to claim 4, characterized in that said confinement is obtained by means such as a sleeve or a cover.
6. Procédé selon la revendication 5, caractérisé en ce que ledit moyen de confinement est en un matériau électriquement isolant.6. Method according to claim 5, characterized in that said confinement means is made of an electrically insulating material.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'il comprend l'utilisation d'alimentations auxiliaires basse tension permettant de mettre en rotation le rotor lorsque ladite méthode de rectification est appliquée à des collecteurs.7. Method according to one of claims 1 to 6, characterized in that it comprises the use of low voltage auxiliary power supplies for rotating the rotor when said rectification method is applied to manifolds.
8. Procédé selon l'une des revendications 1 à 7, caractérisée en ce que, lorsque ledit procédé est appliqué à un collecteur, il comprend l'utilisation d'une fraise à collecteur pour l'abaissement des micas et de la résine situés entre les lames dudit collecteur et pour le fraisage des arêtes desdites lames.8. Method according to one of claims 1 to 7, characterized in that, when said method is applied to a collector, it comprises the use of a collector milling cutter for lowering the micas and the resin located between the blades of said collector and for milling the edges of said blades.
9. Procédé selon la revendication 8, caractérisé en ce que ladite fraise à collecteur comprend une mini-perceuse munie d'un renvoi d'angle, un disque de fraisage mixte et d'au moins deux anneaux de support permettant de maintenir ledit disque à une distance calibrée par rapport aux lames du collecteur, ledit disque mixte comprenant un disque central de diamètre Dl saupoudré de poussière de diamant sur sa périphérie, de manière à permettre l'abrasion des résines et micas dudit collecteur, et, de part et d'autre, deux fraises coniques, de diamètre D2 inférieur à D 1 , munies de dents destinées au fraisage des arêtes des lames dudit collecteur.9. Method according to claim 8, characterized in that said collector milling cutter comprises a mini-drill provided with a bevel gear, a mixed milling disc and at least two support rings making it possible to maintain said disc at a calibrated distance from the blades of the collector, said mixed disc comprising a central disc of diameter Dl sprinkled with diamond dust on its periphery, so as to allow abrasion of the resins and micas of said collector, and, on both sides other, two conical cutters, of diameter D2 less than D 1, provided with teeth intended for milling the edges of the blades of said collector.
10. Outil de rectification pour la mise en œuvre du procédé de rectification selon l'une des revendications 1 à 9, ledit outil comprenant un manche de fixation, une partie arrière, une partie avant et une pastille d'usinage à sec, ladite pastille d'usinage à sec étant fixée sur ladite partie avant et comprenant une face de travail, ledit outil étant caractérisé en ce que ladite pastille est en un matériau de dureté élevée, c'est-à-dire de dureté au moins égale à 10 sur l'échelle de Mohs, en ce que ladite face de travail est inclinée vers le haut d'un angle vertical α par rapport à l'axe principal dudit manche compris entre 8° et 22°, et en ce qu'il comprend des moyens d'aspiration et d'évacuation des déchets d'usinage à proximité de ladite pastille d'usinage.10. Grinding tool for implementing the grinding method according to one of claims 1 to 9, said tool comprising a fixing handle, a rear part, a front part and a dry machining pad, said pad dry machining being fixed on said front part and comprising a working face, said tool being characterized in that said pad is made of a material of high hardness, that is to say of hardness at least equal to 10 on the Mohs scale, in that said working face is inclined upward by a vertical angle α relative to the main axis of said handle between 8 ° and 22 °, and in that it comprises suction and evacuation means machining waste near said machining pad.
1 1. Outil de rectification selon la revendication 10, caractérisé en ce que ledit matériau de dureté élevée est du diamant.1 1. Grinding tool according to claim 10, characterized in that said material of high hardness is diamond.
12. Outil de rectification selon l'une des revendications 10 ou 1 1, caractérisé en ce que ledit angle vertical α est compris entre 10° et 20°.12. Grinding tool according to one of claims 10 or 1 1, characterized in that said vertical angle α is between 10 ° and 20 °.
13. Outil de rectification selon l'une des revendications 10 à 12, caractérisé en ce que lesdits moyens d'aspiration et d'évacuation comprennent une canalisation intégrée audit manche, de préférence sensiblement dans l'axe longitudinal dudit manche, ladite canalisation comprenant au moins une entrée à proximité de la plaquette d'usinage et au moins une sortie munie de moyens de fixation à un système extérieur d'aspiration et d'évacuation des déchets d'usinage.13. Grinding tool according to one of claims 10 to 12, characterized in that said suction and discharge means comprise a pipe integrated into said handle, preferably substantially in the longitudinal axis of said handle, said pipe comprising at at least one inlet near the machining insert and at least one outlet fitted with means for fixing to an external suction and evacuation system for machining waste.
14. Outil de rectification selon la revendication 13, caractérisé en ce que ladite canalisation comprend un canal principal sortant sur la partie arrière du manche et trois entrées situées à proximité, et distribuées autour, de la pastille d'usinage.14. Grinding tool according to claim 13, characterized in that said pipe comprises a main channel exiting on the rear part of the handle and three inlets located close to, and distributed around, the machining pad.
15. Outil de rectification selon l'une des revendications 10 à 14, caractérisé en ce qu'il comprend des moyens d'isolation électrique.15. Rectification tool according to one of claims 10 to 14, characterized in that it comprises means of electrical insulation.
16. Dispositif de rectification pour la mise en œuvre du procédé de rectification selon l'une des revendications 1 à 9, ledit dispositif comprenant un bâti, un outil d'usinage à sec, comprenant un manche de fixation, une partie avant et une partie arrière, ladite partie avant comprenant une pastille d'usinage, ledit bâti comprenant un moyen de fixation dudit outil et des moyens de chariotage et de déplacement vertical dudit outil, ladite pastille comprenant une face de travail, ledit dispositif étant caractérisé en ce que ledit bâti permet de monter ledit outil de telle sorte que l'axe principal dudit manche est incliné vers l'arrière par rapport au sens de rotation dudit contact d'un angle δ compris entre 5° et 10°, et de telle sorte que la face de travail est inclinée vers l'avant par rapport audit sens de rotation d'un angle β compris entre 3° et 12°, et en ce qu'il comprend des moyens d'aspiration et d'évacuation des déchets d'usinages produits à proximité de ladite pastille de l'outil.16. Grinding device for implementing the grinding method according to one of claims 1 to 9, said device comprising a frame, a dry machining tool, comprising a fixing handle, a front part and a part rear, said front part comprising a machining pad, said frame comprising a means for fixing said tool and means for turning and vertically moving said tool, said pad comprising a working face, said device being characterized in that said frame makes it possible to mount said tool so that the main axis of said handle is inclined towards the rear relative to the direction of rotation of said contact by an angle δ of between 5 ° and 10 ° , and in such a way that the working face is inclined towards the front with respect to said direction of rotation by an angle β of between 3 ° and 12 °, and in that it comprises suction and removal of machining waste produced near said tool pad.
17. Dispositif selon la revendication 16, caractérisé en ce que ledit angle de coupe β est compris entre 5° et 10°.17. Device according to claim 16, characterized in that said cutting angle β is between 5 ° and 10 °.
18. Dispositif selon la revendication 16 ou 17, caractérisé en ce que lesdits moyens d'aspiration et d'évacuation des déchets d'usinages sont intégrés audit outil, de telle sorte qu'au moins une entrée d'aspiration débouche à proximité de la pastille de l'outil et qu'au moins un conduit d'évacuation fixé à l'arrière de l'outil évacue les déchets à l'aide d'un système d'aspiration et d'évacuation extérieur.18. Device according to claim 16 or 17, characterized in that said suction and evacuation means of machining waste are integrated into said tool, so that at least one suction inlet opens near the tool pad and at least one discharge duct fixed to the rear of the tool discharges the waste using an external suction and discharge system.
19. Dispositif selon l'une des revendications 16 à 18, caractérisé en ce que la partie avant de l'outil est munie de moyens de confinement permettant de canaliser efficacement les déchets d'usinage vers la ou les entrées d'aspiration et de limiter leur dispersion hors de la zone d'aspiration produite par lesdits moyens d'aspiration.19. Device according to one of claims 16 to 18, characterized in that the front part of the tool is provided with confinement means making it possible to efficiently channel machining waste towards the suction inlet (s) and to limit their dispersion outside the suction zone produced by said suction means.
20. Dispositif selon l'une des revendications 16 à 19, caractérisé en ce que ledit outil est isolé électriquement dudit bâti. 20. Device according to one of claims 16 to 19, characterized in that said tool is electrically isolated from said frame.
PCT/FR1999/002213 1998-09-21 1999-09-17 Method, tool and device for rectifying on site collectors and slip rings in electric machines WO2000016945A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9811896A FR2783641B1 (en) 1998-09-21 1998-09-21 METHOD, TOOL AND DEVICE FOR IN SITU RECTIFICATION OF COLLECTORS AND RINGS OF ELECTRIC MACHINES
FR98/11896 1998-09-21

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WO2000016945A1 true WO2000016945A1 (en) 2000-03-30

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WO (1) WO2000016945A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2874847A1 (en) * 2004-09-07 2006-03-10 Carbone Lorraine Applications Electriques In situ machining method for e.g. commutator of electric motor, involves displacing active end of cutting tool in perpendicular plane by combining rotation around axis and translation along plunge-in direction of rotation center of tool
US7509896B2 (en) 2005-10-11 2009-03-31 Carbone Lorraine Applications Electriques Process for machining in situ the peripheral surface of a rotating part, and apparatus for carrying out said process
CN117415628A (en) * 2023-12-18 2024-01-19 宁波胜克换向器有限公司 Laser slot milling machine with assembled commutator and use method thereof

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2874847A1 (en) * 2004-09-07 2006-03-10 Carbone Lorraine Applications Electriques In situ machining method for e.g. commutator of electric motor, involves displacing active end of cutting tool in perpendicular plane by combining rotation around axis and translation along plunge-in direction of rotation center of tool
EP1641091A1 (en) * 2004-09-07 2006-03-29 Carbone Lorraine Applications Electriques Method allowing the in-situ machining of the peripheral surface of a rotational workpiece and device facilitating the method
US7509896B2 (en) 2005-10-11 2009-03-31 Carbone Lorraine Applications Electriques Process for machining in situ the peripheral surface of a rotating part, and apparatus for carrying out said process
CN117415628A (en) * 2023-12-18 2024-01-19 宁波胜克换向器有限公司 Laser slot milling machine with assembled commutator and use method thereof
CN117415628B (en) * 2023-12-18 2024-04-02 宁波胜克换向器有限公司 Laser slot milling machine with assembled commutator and use method thereof

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FR2783641B1 (en) 2000-11-03

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