EP3707488A1 - Procédé et dispositif d'équilibrage - Google Patents

Procédé et dispositif d'équilibrage

Info

Publication number
EP3707488A1
EP3707488A1 EP18799503.0A EP18799503A EP3707488A1 EP 3707488 A1 EP3707488 A1 EP 3707488A1 EP 18799503 A EP18799503 A EP 18799503A EP 3707488 A1 EP3707488 A1 EP 3707488A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
dad
net
balancing
imbalance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP18799503.0A
Other languages
German (de)
English (en)
Inventor
Kevin WÖHLER
Frank Altag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp AG
Thyssenkrupp Dynamic Components GmbH
Original Assignee
ThyssenKrupp AG
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 ThyssenKrupp AG filed Critical ThyssenKrupp AG
Publication of EP3707488A1 publication Critical patent/EP3707488A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/14—Determining imbalance
    • G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/30—Compensating imbalance
    • G01M1/34—Compensating imbalance by removing material from the body to be tested, e.g. from the tread of tyres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/34—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by testing the possibility of maintaining the vacuum in containers, e.g. in can-testing machines

Definitions

  • the invention relates to a method for balancing a workpiece having the features of the preamble of claim 1.
  • the invention further relates to a device for balancing a workpiece with the
  • balancing parts balancing disks
  • Balancing bodies As screws, from one position to another.
  • the balancing is done iteratively with several repetitions until a certain grade is reached.
  • the invention is based on the object to provide a method and an apparatus for balancing a workpiece, in which the process times can be shortened.
  • the object is achieved by a method for balancing a
  • the forces and / or moments and / or vibrations are measured, which arise due to an imbalance of the workpiece during rotation of the workpiece.
  • To reduce the imbalance material of the workpiece is removed.
  • the invention is characterized in that the material is removed during the measurement of the rotating workpiece. Alternatively, if the measurement and removal take place separately, the workpiece is continuously rotated between measuring and ablation.
  • the invention has the advantage that the process times are shortened because there is no standstill of the workpiece between measuring and ablation. In the best case, it is measured and removed at the same time.
  • the workpiece is not braked during the entire balancing process.
  • the "Correct through material removal” step is carried out at full speed, that is, the workpiece is not braked to a standstill.
  • the balancing process comprises a rough balancing and a subsequent fine balancing.
  • coarse balancing and fine balancing are preferably carried out by removing material at different locations.
  • the balancing process comprises exactly one measurement and exactly one removal.
  • At a first target speed is the
  • the target contour is applied by ablation on the balancing body.
  • Target speed takes place, wherein the second target speed is lower than the first target speed.
  • the workpiece for the removal process although partially, but not completely, must be braked;
  • the workpiece must be accelerated less strongly to the higher, first target speed.
  • the first target speed may be above 3,000 revolutions / minute, e.g. At 4,000 rpm.
  • the second target speed may be lower than 3000 revolutions / minute, e.g. At 1,500
  • the removal can be done by machining processes.
  • the removal can be carried out in particular with a defined or undefined cutting edge.
  • the removal takes place by supplying a cooling medium such as an oil or a grinding emulsion.
  • the machining by grinding has the advantage that the profile of the workpiece can be changed precisely.
  • the existing in the presence of imbalance eccentricity of the workpiece can be particularly well eliminated by grinding and creating a non-circular outer contour of the workpiece.
  • the material of the workpiece to reduce the imbalance in a direction radially and / or parallel and / or obliquely to Rotated axis removed are particularly preferred.
  • the feed movement during removal can be achieved by a relative movement between the workpiece and a processing means.
  • Relative movement can be effected for example by a rotary and / or translational movement of the workpiece and / or by a rotary and / or translational movement of the processing means.
  • removing material of the workpiece to reduce the imbalance can be cyclically delivered.
  • the cyclic delivery can be carried out directly, wherein the processing means moves toward the stationary rotating workpiece.
  • Stationary rotation means that the workpiece rotates around a stationary axis of rotation. Alternatively, the rotating workpiece in the direction of
  • Be delivered processing agent This means that a storage table of the processing device or at least parts thereof are movable together with the rotating workpiece on it.
  • the delivery is set up such that the relative speed in the machining contact between the workpiece and
  • Processing means is approximately the same at each time point.
  • the workpiece has a balancing body whose material is removed to reduce the imbalance, wherein a non-circular outer contour of the balancing body is generated.
  • the balancing body has the advantage that a material well suited for the removal and / or a corresponding geometry of the balancing body can be used.
  • the object is specifically achieved by a device for balancing a workpiece with a clamping device for the workpiece and a rotary drive for rotating the workpiece about an axis of rotation.
  • the device has at least one sensor for measuring forces and / or moments and / or
  • the apparatus further comprises a processing device for removing material of the workpiece by the rotation of the workpiece.
  • the processing device according to the invention on the basis of the signals of the sensor can be controlled such that the material for reducing the imbalance in the rotation of the workpiece is ablatable.
  • the invention is based on
  • the invention provides that the processing device on the basis of the signals of the sensor is controlled such that the material can be removed to reduce the imbalance in the rotation of the workpiece.
  • the processing device may have a processing means, which cooperates for the removal of the material with the workpiece.
  • Processing device preferably comprises a grinding device with a grinding wheel or a grinding belt as processing means.
  • the processing means may be stationary or movable.
  • the stationary training of the processing means that the
  • Relative speed between the processing means and the workpiece corresponds to the rotational speed of the workpiece multiplied by the current radius of the balancing body or workpiece. If that
  • Machining means is designed to be movable, the relative movement between the workpiece and the processing means can be effected by a same direction or opposite rotational movement relative to the rotational movement of the workpiece.
  • the effective relative speed results from the Surface speed of the workpiece or the balancing body superimposed with the surface speed of the processing means.
  • the processing device is movable parallel to the axis of rotation, so that a plurality of axially, i. along the axis of rotation spaced balancing body can be edited.
  • Machining means along the axis of rotation are arranged at a distance, so that the processing of several balancing bodies at the same time is possible, whereby the process times are further reduced.
  • the clamping device has bearing means for receiving shaft seats of the workpiece or a centering spindle to the front side
  • the centering spindle has the advantage that the processing of the bearing seats can be done by the processing device, whereby the efficiency of the device is increased.
  • a further preferred embodiment provides that further surfaces can be processed by the processing device.
  • the workpiece to be balanced is in particular a rotor of an electrical machine, for example a synchronous or
  • the rotor is set up to a
  • the rotor may have a laminated core and a shaft. It can include balancing discs.
  • the rotor may include a short circuit cage comprising shorting bars and
  • the short-circuit bars can protrude axially beyond the short-circuit rings.
  • the removal of material can preferably take place at one or more of the following processing positions: the peripheral surface of a laminated core, a short-circuit ring and / or a balancing disk and an end face of a balancing disk or a short-circuit ring. So far Short-circuit bars protrude axially beyond the short-circuit rings, the
  • Processing take place at the axially projecting portions of the shorting bars.
  • the machining can also be done on other elements such as end-side end elements of a rotor core.
  • the machining can be done on a centrifugal cap of a current-excited synchronous machine.
  • the centrifugal cap is to be understood as an end-side closing element which encloses outstanding rotor windings via the rotor laminated core in order to absorb the centrifugal forces acting on the rotor windings.
  • the balancing can continue to take place on the shaft of the rotor itself.
  • the balancing a coarse balancing, preferably close to the axis of the axis of rotation of the rotor, for example on the shaft, and a fine balancing, preferably off-axis, for example, on the laminated core done.
  • one or more shielding elements can be provided on the balancing device and / or the balancing piece.
  • dirt-sensitive parts of the rotor for example, can be protected against the ingress of dirt, such as grinding dust or grinding chips, and / or subsequent cleaning effort can be reduced.
  • Fig. 1 is a front view of a device for balancing a
  • FIG. 2 shows a detailed view of the grinding device according to FIG. 1 from the side;
  • Fig. 3 is a front view of a device for balancing a
  • FIG. 4 is a detail view of the grinding device of FIG. 3 from the side and
  • FIG. 5 shows a balancing body which has been machined according to the invention and has been ground spherical or out of round from a circular initial shape
  • Fig. 6 shows an alternative embodiment of the embodiment according to
  • FIGS. 1 and 2 in which the processing means can be delivered in translation
  • Fig. 7 shows a rotor, wherein the balancing of balancing discs
  • Fig. 8 shows an asynchronous rotor, in which the balancing on
  • Fig. 9 shows a rotor, wherein the balancing at the
  • Peripheral surface of a laminated core is made.
  • FIG. 1 shows an example of a device for balancing a workpiece 10, in particular for balancing a rotor for an electric motor.
  • the device is also per se, i. without the workpiece 10 disclosed and claimed.
  • the device is also disclosed and claimed together with the workpiece 10 to be balanced.
  • the device comprises a clamping device 30 with bearing means 31 for supporting the shaft seats 32 of the workpiece 10. Instead of the bearing means 31, a centering spindle 33, as shown in Fig. 3, used when the bearing seats 32 are to be processed.
  • the clamping device 30 defines an axis of rotation 11 about which the workpiece 10 is rotatable in the clamped state, as shown in Fig. 1.
  • the rotational movement is generated by a rotary drive 13, which is shown by way of example in FIG. 2.
  • the rotary drive 13 may be designed as a roller drive. Other rotary actuators 13 are possible.
  • the device comprises at least one sensor, in particular a plurality
  • Sensors (not shown), which are designed to measure the forces and / or moments and / or vibrations, which act due to an imbalance of the workpiece 10 during rotation or arise.
  • the sensors are connected to a data processing device, also not shown.
  • the data processing device is configured or adapted to the
  • the processing device 20 is formed in the example of FIG. 1 as a grinding device 22 with a grinding wheel 23. As shown in Fig. 2, the
  • Grinding wheel 23 movable, tiltably mounted in the example of FIG. 2 (see double arrow), so that a feed movement in the radial direction perpendicular to the axis of rotation 11 is possible.
  • the grinding wheel 23 and the workpiece 10 rotate in opposite directions. Another way, the relative movement between the
  • the processing device 20, specifically the grinding device 22 can be activated on the basis of the signals of the sensor or of the sensors.
  • the control can be carried out by the above-mentioned data processing device which is connected to the sensor or the sensors.
  • the workpiece 10 is provided with two balancing bodies 12 in the form of discs, specifically on the shaft of the workpiece 10. To reduce In the example, the imbalance is removed from the balancing bodies 12 of the workpiece 10. Another number of balancing bodies 12 is possible.
  • the grinding device 22 is movable parallel to the axis of rotation 11, so that both balancing body 12 by one and the same
  • Grinding device 22 can be edited. The balancing process is continued until a desired balancing quality is achieved. For high-speed rotors, this z. B. a balancing grade G of 2.5 or better (see the international standard ISO 1940-1).
  • Workpiece 10 is clamped and rotated to a first target speed. Now the balancing process begins.
  • an imbalance is determined and transmitted to a control device (not shown) (step 1).
  • the workpiece is set to a second suitable for the grinding process
  • step 2 Accelerated target speed and processed in accordance with the control specifications of the controller by means of the grinder (step 2). Then the workpiece is moved back to the first target speed and the imbalance is measured again (step 1). If the determined balancing quality does not yet correspond to the desired balancing quality, then steps 2 and 1 are repeated until the desired balancing quality has been achieved. If this is achieved, that is
  • Balancing process is not slowed down to a stop, but continuously rotates.
  • the speed can vary, in particular between the measuring process and the material-removing process. However, during the actual process, the workpiece never reaches zero speed.
  • processing device 20 may be arranged so that thus also a further surface treatment of the outer circumference of the workpiece, for. B. the surface of a Blechpaktes, can take place.
  • Balancing discs 12 of the workpiece 10 omitted.
  • FIGS. 3, 4 is based on the same principle as the device according to FIGS. 1, 2.
  • Abrasive belt 24 is formed.
  • the grinding belt 24 or the grinding device 22 is, as shown in Fig. 1, arranged parallel to the axis of rotation 11 movable.
  • a plurality of grinding devices 22 may be provided, so that the balancing body 12 can be processed simultaneously.
  • the clamping device 30 has a centering spindle 33, so that the bearing seats 32 of the workpiece 10 can be processed.
  • the grinding device 22 thus has a multiple function.
  • the looping direction 22, as described in connection with FIG. 1, makes it possible to reduce the imbalance by material removal.
  • the bearing seats 32 can be processed, whereby the overall efficiency of the device is improved.
  • the feed movement of the processing means 21 is not effected by a
  • the workpiece 10 is clamped in the clamping device 30 and rotated about the axis of rotation 11.
  • the rotary drive 13 is provided.
  • One or more sensors measure the forces and / or moments and / or vibrations that arise during the rotation due to the unbalance of the workpiece 10.
  • the material of the workpiece 10 (directly or via the balancing body or the balancing body 12) ablated.
  • the removal takes place by grinding. Other material removing processes are possible.
  • FIG. 7 schematically illustrates a rotor 50.
  • the rotor has a shaft 40, a laminated core 41 and two balancing disks 43.
  • the balancing wheel is
  • magnetically inert and usually consists of iron.
  • the magnetically active part of the rotor (rotor core, magnets or winding) is during the
  • Balancing operation by a shielding 45 separated from the balancing wheel 43 Balancing operation by a shielding 45 separated from the balancing wheel 43.
  • balancing material is removed on at least one of the balancing discs 43 according to one of the aforementioned methods.
  • the balancing disk can be ground non-round over the peripheral surface (A2).
  • FIG. 8 schematically illustrates a rotor 51 in accordance with FIG. 7.
  • the rotor has a short-circuit cage with short-circuit bars 44 and short-circuit rings 42.
  • a short-circuit ring is the front-side, electrical connection element of a short-circuit cage in an asynchronous machine.
  • the shorting cage may be cast or assembled (from shorting bars and shorting rings).
  • the shorting bars 44 terminate flush with the short circuit rings 42. They do not point axially beyond the short-circuit rings.
  • Shielding element 45 attached.
  • the rotor has no balancing discs.
  • For balancing material is removed on at least one of the short-circuiting rings 42 according to one of the aforementioned methods.
  • the short-circuit ring 42 can be ground non-round over the peripheral surface (B2).
  • FIG. 9 schematically illustrates a rotor 50 according to FIG. 7.
  • the rotor is adapted to be balanced on the circumferential surface (C) of the rotor
  • the laminated core as such is ground non-round. This can be used particularly advantageously for asynchronous machines with cast short cages, since the laminated core must be reworked in cast short cages due to pouring out of sheet metal laminations of the laminated core casting residues anyway. Again, can be dispensed with a separate balancing wheel.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

L'invention concerne un procédé d'équilibrage d'une pièce (10) dans lequel - la pièce (10) est entraînée en rotation sur un axe de rotation (11), - les forces et/ou les moments sont mesurés qui sont dus à un déséquilibre de la pièce (10) lors de la rotation de la pièce, et - le matériau de la pièce (10) est retiré pour réduire le déséquilibre. L'invention est caractérisé en ce que le matériau est enlevé pendant la mesure de la pièce (10) en rotation ou la pièce (10) est entraînée en rotation continue entre la mesure et le processus d'enlèvement.
EP18799503.0A 2017-11-06 2018-11-05 Procédé et dispositif d'équilibrage Ceased EP3707488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017125889.2A DE102017125889A1 (de) 2017-11-06 2017-11-06 Verfahren und Vorrichtung zum Auswuchten
PCT/EP2018/080180 WO2019086669A1 (fr) 2017-11-06 2018-11-05 Procédé et dispositif d'équilibrage

Publications (1)

Publication Number Publication Date
EP3707488A1 true EP3707488A1 (fr) 2020-09-16

Family

ID=64172496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18799503.0A Ceased EP3707488A1 (fr) 2017-11-06 2018-11-05 Procédé et dispositif d'équilibrage

Country Status (5)

Country Link
US (1) US11656143B2 (fr)
EP (1) EP3707488A1 (fr)
CN (1) CN111295576B (fr)
DE (1) DE102017125889A1 (fr)
WO (1) WO2019086669A1 (fr)

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CN117716222A (zh) 2021-07-28 2024-03-15 蒂森克虏伯动力部件德国有限公司 不平衡测量装置、加工装置以及用于加工工件的方法
DE102023102019A1 (de) 2023-01-27 2024-08-01 Thyssenkrupp Ag Unwuchtmesseinrichtung, Bearbeitungseinrichtung, sowie Verfahren zur Kalibrierung der Bearbeitungseinrichtung, insbesondere der Unwuchtmesseinrichtung
DE102024003295A1 (de) 2024-10-09 2026-04-09 Mercedes-Benz Group AG Rotor für eine Axialflussmaschine, insbesondere eines Kraftfahrzeugs, Verfahren eines solchen Rotors sowie Axialflussmaschine

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US11656143B2 (en) 2023-05-23
US20200264065A1 (en) 2020-08-20
CN111295576A (zh) 2020-06-16
WO2019086669A1 (fr) 2019-05-09
CN111295576B (zh) 2022-05-27
DE102017125889A1 (de) 2019-05-09

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