EP3475028A1 - Unité de libération pour une broche de machine-outil - Google Patents

Unité de libération pour une broche de machine-outil

Info

Publication number
EP3475028A1
EP3475028A1 EP17748753.5A EP17748753A EP3475028A1 EP 3475028 A1 EP3475028 A1 EP 3475028A1 EP 17748753 A EP17748753 A EP 17748753A EP 3475028 A1 EP3475028 A1 EP 3475028A1
Authority
EP
European Patent Office
Prior art keywords
spindle
release unit
rotor shaft
electric motor
unit according
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.)
Withdrawn
Application number
EP17748753.5A
Other languages
German (de)
English (en)
Inventor
Joachim Van Sprang
Michael Bergbaur
Matthias SCHEFFOLD
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.)
Franz Kessler GmbH
Original Assignee
Franz Kessler GmbH
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 Franz Kessler GmbH filed Critical Franz Kessler GmbH
Publication of EP3475028A1 publication Critical patent/EP3475028A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/28—Chucks characterised by features relating primarily to remote control of the gripping means using electric or magnetic means in the chuck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/003—Work or tool ejection means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/08—Rigid support of bearing units; Housings, e.g. caps, covers for spindles
    • F16C35/10—Rigid support of bearing units; Housings, e.g. caps, covers for spindles with sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/08—Rigid support of bearing units; Housings, e.g. caps, covers for spindles
    • F16C35/12—Rigid support of bearing units; Housings, e.g. caps, covers for spindles with ball or roller bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/008—Bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/008—Bearings
    • B23B2260/0082—Sliding contact bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/062—Electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement

Definitions

  • the invention relates to a release unit for a
  • Dissolving units generated This is usually a piston-cylinder system, which is pressurized on one side. This pressure multiplied by the area of the piston acts as a release force via a pressure contact on the drawbar.
  • the pressure required to release the tool is either hydraulically generated (usually in the range of about 80 to 140 bar) or when using pneumatic release units compressed air is used (usually 5 to 6 bar), which is not only energy-intensive in hydraulic systems but it can also be dangerous for leaks.
  • Hydraulic oil connection has. A disadvantage of such hydraulic or pneumatic
  • Dissolving units is also that in addition to the electrical connection for the motor spindle or the electromagnetic
  • Machine tool a correspondingly high design and financial expense.
  • the object of the invention is in contrast, to propose a release unit for a machine tool spindle, in particular motor spindle, the constructive and / or
  • Electromagnetic drive system comprehensive electric motor is formed with a rotating about an axis of rotation, cylindrical rotor shaft that the linearly adjustable
  • Release unit can be replaced in an advantageous manner a previously existing small-sized, hydraulic release unit. Consequently, according to the invention, a separate
  • Machine tool spindle or motor spindle are omitted. That means that too
  • Pressure generating unit for generating the hydraulic pressure or pneumatic pressure is unnecessary, especially for the
  • Tool clamp actuated in particular triggers. Consequently, previously common or standardized tool clamping components corresponding machine tool spindle / motor spindle
  • Machine tool spindle / motor spindles but also for already in use machine tool spindles.
  • connection flange which essentially corresponds to a connection flange of previous hydraulic / pneumatic release units, so that, for example, a
  • connection flange can be realized.
  • Previously common hydraulic release units often have a rotary feedthrough or a media feedthrough for coolants and / or lubricants or the like, so that
  • Connections can in turn correspond to the hitherto customary connections of hydraulic release units, so that no adjustment of the media feedthrough system is necessary here. This reduces the effort for the integration of
  • Electrical release unit according to the invention or increases the compatibility of the electrical release unit according to the
  • Machine tool spindles / motor spindles
  • the rotor or spindle nut is coaxial with respect to the spindle element or linearly adjustable
  • Dual function of the electrical release unit on the one hand as an electric motor and on the other hand as a linear drive, is also a reduction of the used, needed
  • the rotor shaft of the electric motor is designed as a magnetic carrier element comprising at least one permanent magnet of the drive system. This causes the permanent magnets of the electromagnetic
  • Fixing provided for secure fixation of the permanent magnets on the rotor shaft. This can be, for example
  • the rotor shaft of the electric motor comprises at least one thread, in particular can also several threads.
  • Threads are provided. This means that the / the
  • Threads are arranged according to the invention on / on the inside / surface of the rotor shaft or at least partially form the inward / facing surface of the rotor shaft. Consequently, the rotor shaft advantageously has an internal thread of the conversion unit.
  • Threads are achieved, allowing a favorable
  • Threads can be provided, for example, metric or trapezoidal thread as well as ball screw or the like.
  • a comparatively small / small pitch of the thread (s) is provided, which advantageously leads to a relatively large / strong feed force or release force.
  • Rotor shaft or spindle nut of the conversion unit directly in contact with the corresponding thread of the
  • Spindle element is.
  • rolling elements between the spindle nut and the spindle element are arranged.
  • the conversion unit according to the invention in an advantageous manner as a roller screw, in particular planetary roller screw, or preferably designed as a ball screw. Especially with such
  • Screw drives are a very high linear
  • Non-rotating spindle element compared to a direct or immediate drive mode (ie without rolling elements) is significantly reduced, resulting in a corresponding small and energy-efficient design of the electromagnetic drive system of the electric motor leads. This is advantageous because, especially with the use of hitherto usual tool clamps or release / clamping components corresponding machine spindles / motor spindles, esp.
  • Belleville spring packs a relatively large release force, e.g. about 45kN, in the direction of the axial adjustment of the
  • Dissolving unit is to be generated can be generated in an advantageous manner by reducing the friction losses within the release unit or within the conversion unit of the electromagnetic drive system of the electric motor of the release unit according to the invention.
  • the rolling elements are substantially formed as rollers, each having axes of rotation which are each arranged as parallel to the axis of rotation of the spindle member and the rotor shaft.
  • an advantageous gear or the like is present to a common drive mode of the approximately in the circumferential direction
  • the rollers and / or the advantageous gear are advantageously driven by the spindle nut or the rotor shaft according to the invention or are in direct contact with the rotor shaft.
  • the conversion unit is advantageously as planetary roller screw
  • the conversion unit is designed as a ball screw, wherein the rolling elements are formed as balls. This will be the constructive as well as economical effort clearly
  • the conversion unit is achieved, that the spindle nut is arranged very close to the spindle element, since the trained as balls rolling elements in each case substantially just half in the thread of the spindle nut on the one hand and on the other hand in the corresponding thread of the spindle element or fill it accordingly ,
  • a significant reduction of the realizable or minimum outer diameter of the conversion unit is achieved in comparison to a roller screw drive. This is achieved because in the roller screw the thread of the spindle nut is comparatively far spaced from the thread of the spindle element or in between the respect.
  • Balls are arranged comparatively large sized rollers.
  • Ball screw of particular advantage since not only a particularly low friction can be realized, but at relatively low drive power of
  • a ball screw is characterized by a high
  • the rotor shaft of the electric motor comprises at least one return or a return channel to
  • Threads arranged. So can advantageously the Rolling or balls again one or more turns are returned or transported, insofar as they migrate in operation in the axial direction.
  • at least one sealing element is provided on the spindle nut and / or rotor shaft and / or on the thread (at the end) which, as a stop, moves out or "falls out”
  • Rolling in particular two ball bearings, formed, which are realized in so-called X or 0 arrangement. This can be absorbed not only radially but also axially forces in an advantageous manner.
  • At least one of the bearings is as
  • Tapered roller bearing formed. This ensures that a recording of relatively large axial and radial forces can be realized with a single roller bearing. This means that hereby an axial / radial bearing with only a single roller bearing is feasible, so that very little space is required for this storage.
  • the rolling elements between a first sliding bearing or first spindle bearings and arranged at least a second sliding bearing or second spindle bearings.
  • each is an advantageous seal or at least one
  • Sealing element / sealing ring per slide bearing provided.
  • at least one of the spindle bearings as rolling bearings, esp. Ball / roller bearings, for the storage of
  • the rotor shaft comprises at least a first sliding surface of the first sliding bearing and / or a stator of the electric motor at least a second sliding surface of the second sliding bearing.
  • the first slide bearing is arranged on a first end section or a first stop element for striking the tool clamp and / or the second slide bearing on
  • the first and / or second bearing of the rotor shaft is designed at least as an axial bearing of the spindle element for receiving forces oriented in the direction of the axis of rotation. So that is in an advantageous way
  • Tapered roller bearings of the rotor shaft can be recorded. This reduces the cost of storage of the rotor, or the rotor shaft, since this storage at the same time for the radial / axial mounting of the adjusting element or
  • a stator of the electric motor comprises at least one
  • Linear guide device for guiding the spindle element along the adjustment. This achieves an advantageous guidance of the spindle element in the direction of the adjustment path and thus for releasing the tool clamp.
  • the linear guide device according to the invention is also known as
  • Holding unit or stop unit for holding / striking the spindle element, with respect to a rotation in the circumferential direction, formed advantageously prevents the linear guide rotation of the spindle element during operation in an advantageous manner, so that a relative movement between the spindle nut and spindle element by the
  • Linear guide device prevents. This improves the reliability or the operation of the conversion unit.
  • the linear guide device comprises an advantageous (planar) guide surface, which is aligned substantially parallel or longitudinal to the axis of rotation.
  • Rolling in particular rollers or the like can be used.
  • a sliding guide can be realized as a linear guide.
  • At least one proximity sensor in particular inductively or capacitively or optically or magnetically, is provided.
  • a rotary encoder or incremental encoder or the like can be provided, which rotates or the
  • a relative rotary encoder for relative determination of an adjustment in the circumferential direction can be combined with a limit switch or end position sensor in an advantageous manner.
  • a limit switch or end position sensor in an advantageous manner.
  • an end position detection insofar as an absolute encoder is used, which is somewhat more complex.
  • Electric motor according to the invention are essentially combined with previously commercially available tool clamps or work together. This disc springs are often available for clamping the tool in the operating position. With the help of the electrical release unit according to the invention with
  • the release unit can be used at the same time for clamping or clamping of the tool.
  • the release unit according to the invention with the electric motor not only generates a release force or a release stroke in the direction tool along the axis of rotation, but possibly during operation also a clamping force against this direction, i. that by means of a pull rod or a tension element bracing of the tool in the tool holder or the like by corresponding stroke or linear adjustment to "back" or away from the tool side of the
  • Machine tool spindle can be generated. This would be the cost of the tool clamping or for a
  • Sensor unit for detecting an electric motor parameter provided. For example, an evaluation of the
  • an actual-target comparison is provided, e.g. a low Leerlaufström or idle power and / or an electrical release current or a lifting / Lender oriental with a (stored) target power or the like is compared to a proper
  • Figure 1 schematically shows a first section through a
  • Figure 2 schematically shows a second section through the
  • an electrical release unit 1 which has an electric motor 2 with a stator 3 and a rotor 4 includes.
  • the stator 3 with electromagnetic coils 8 has circumferentially / externally on a stator 5, which forms a hollow cylindrical or annular cooling channel 7 for cooling water with a stator 6.
  • the rotor 4 comprises a rotor shaft 9, on the circumferential side permanent magnets 10 are fixed, esp. Glued and
  • the rotor shaft 9 with a ball bearing 11 and a tapered roller bearing 12, the latter can accommodate not only radial forces, but especially axial forces.
  • the linear drive 13 is designed as a ball screw 13, so that this includes numerous balls 15 as rolling elements 15. These are on the one hand between the rotor shaft 9, which also forms the spindle nut 9 of the linear drive 13, and a spindle member 16 and on the other hand between two plain bearings 17, 18 for supporting the spindle member 16, in addition to the balls 15, a radial support / leadership of the spindle element 16 can educate.
  • An advantageous ball return for the axial return of the balls during operation is not shown in detail and is arranged in the interior of the rotor shaft 9 as a channel / formed.
  • Rotor shaft 9 the spindle member 19 is adjusted along the axis of rotation in the direction of a stroke H.
  • a thread pitch of about 5 mm is provided and a stroke H is about 8 to 20 mm long and presses with about 45kN, so that the electrical release unit 1 can replace a previously used hydraulic release unit, wherein a
  • Connecting flange 33 has corresponding fixing options or screw holes to be screwed / fixed at the rear end of a motor spindle or a tool clamp not shown.
  • Spindle element 16 is a separate element 22, e.g. Magnet for a Hall sensor or the like, introduced, which is the sensor
  • the senor 20 can detect in an advantageous manner.
  • the sensor 20 may be formed as a proximity sensor 20, so that a groove 21 or recess together with the spindle member 16, the rest position in an advantageous manner for the sensor 20th
  • FIG. 1 schematically shows a second, separate element 23, with which the
  • a (relative) rotary encoder 24 which can detect the angular position of the rotor shaft 9.
  • Encoder 25 and a ring gear 26 are provided, whereby the angular position can be detected.
  • linear drive 13 is preferably two
  • Linear guides 27 and torque supports 27 are provided. This supports the spindle element 16 in the circumferential direction on
  • Linear guides 27 each have a fixing screw 28, on which a roller bearing 29 is mounted with outer ring and rollers as rolling elements.
  • a roller bearing 29 is mounted with outer ring and rollers as rolling elements.
  • the spindle element 16 is hollow-cylindrical in order to transport or pass through a medium, in particular a cooling lubricant or the like, centrally in the interior.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Turning (AREA)

Abstract

L'invention concerne une unité de libération (1) pour une broche de machine-outil, en particulier une électro-broche, laquelle unité de libération est destinée à libérer un porte-outil, l'unité de libération (1) comprenant un élément de réglage (16) à déplacement linéaire le long d'un trajet de déplacement (H) et destiné à actionner le porte-outil, ladite unité de libération permettant de simplifier la structure et/ou de rendre la gestion d'entreprise plus aisée. A cet effet, selon l'invention, l'unité de libération (1) est conçue sous forme de moteur électrique (2) comprenant un système d'entraînement électromagnétique (8, 10) et présentant un arbre de rotor (9) cylindrique creux tournant autour d'un axe de rotation (14), l'élément de réglage (16) à déplacement linéaire est conçu sous forme d'élément broche (16) d'une unité de conversion (13) pour convertir la rotation du moteur électrique (2) en un déplacement linéaire (H) et l'arbre de rotor (9) se présente sous forme d'écrou de broche (9) de l'unité de conversion (13).
EP17748753.5A 2016-09-09 2017-08-03 Unité de libération pour une broche de machine-outil Withdrawn EP3475028A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016116927.7A DE102016116927A1 (de) 2016-09-09 2016-09-09 Löseeinheit für eine Werkzeugmaschinenspindel
PCT/EP2017/069712 WO2018046202A1 (fr) 2016-09-09 2017-08-03 Unité de libération pour une broche de machine-outil

Publications (1)

Publication Number Publication Date
EP3475028A1 true EP3475028A1 (fr) 2019-05-01

Family

ID=59523130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17748753.5A Withdrawn EP3475028A1 (fr) 2016-09-09 2017-08-03 Unité de libération pour une broche de machine-outil

Country Status (6)

Country Link
US (1) US20190210118A1 (fr)
EP (1) EP3475028A1 (fr)
CN (1) CN109689285A (fr)
DE (1) DE102016116927A1 (fr)
TW (1) TW201815496A (fr)
WO (1) WO2018046202A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108372317A (zh) * 2018-04-03 2018-08-07 台州屹捷数控机床有限公司 一种中驱动电主轴
DE102018007905A1 (de) 2018-10-08 2020-04-09 Günther Zimmer Arbeitsspindel mit Sensoren und Verfahren zur Erfassung und Überwachung ihrer Historie

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012136601A1 (fr) * 2011-04-07 2012-10-11 Mag Ias Gmbh Dispositif de serrage de pièce, machine-outil, procédé permettant de serrer de manière libérable un ensemble pièce et procédé d'usinage de pièce

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Also Published As

Publication number Publication date
TW201815496A (zh) 2018-05-01
CN109689285A (zh) 2019-04-26
US20190210118A1 (en) 2019-07-11
DE102016116927A1 (de) 2018-03-15
WO2018046202A1 (fr) 2018-03-15

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