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WO1998004377A2 - Arbre moteur pour machine-outil - Google Patents

Arbre moteur pour machine-outil Download PDF

Info

Publication number
WO1998004377A2
WO1998004377A2 PCT/EP1997/003659 EP9703659W WO9804377A2 WO 1998004377 A2 WO1998004377 A2 WO 1998004377A2 EP 9703659 W EP9703659 W EP 9703659W WO 9804377 A2 WO9804377 A2 WO 9804377A2
Authority
WO
WIPO (PCT)
Prior art keywords
clamping
rod head
tool
measuring beam
receiver
Prior art date
Application number
PCT/EP1997/003659
Other languages
German (de)
English (en)
Other versions
WO1998004377A3 (fr
Inventor
Heinz Kempkensteffen
Original Assignee
Ima Montagetechnik 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 Ima Montagetechnik Gmbh filed Critical Ima Montagetechnik Gmbh
Priority to EP97936635A priority Critical patent/EP0876237A2/fr
Publication of WO1998004377A2 publication Critical patent/WO1998004377A2/fr
Publication of WO1998004377A3 publication Critical patent/WO1998004377A3/fr

Links

Classifications

    • 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
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • B23Q5/58—Safety devices
    • 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
    • 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
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders

Definitions

  • the invention relates to a work spindle for a machine tool with a clamping device having a clamping device for tools with hollow shaft taper and with a sensor device detecting the clamping position of the clamping rod head of the type specified in the preamble of claim 1.
  • Such work spindles are operated in modern machine tools with very high speeds, which lie in the size order of 20 000 min _1.
  • the tool must rest with its stop collar on the associated stop of the clamping device of the tool holder, which is done by tightening the tool via the clamping elements engaging in its hollow shaft cone, to which a corresponding tensile force is exerted by means of the clamping rod and the clamping springs acting on the clamping rod.
  • the ejection cylinder releases the clamping rod head, and it can be determined from the axial position of the released clamping rod head whether the tool held by the clamping device has assumed its correct clamping position. If this is not the case, the work spindle must not start up due to the possible unbalance.
  • the aim is to detect the upper end position of the tension rod head as precisely as possible, for which so-called initiators are used in a known design of generic work spindles.
  • initiators are used in a known design of generic work spindles.
  • These are inductive proximity switches which are arranged in the radial direction of the tension rod at the height of the tension rod head.
  • these initiators must be adjusted very precisely because the hysteresis of the inductive proximity switches alone causes inaccuracies.
  • the entire clamping device of a work spindle settles, which usually leads to the clamping rod head moving upwards when the tool is properly clamped. This is an error condition for the initiators, once they are firmly adjusted, whereupon the spindle start is not released despite the properly clamped tool. The entire machine tool can therefore only be put into operation again after the initiators have been readjusted.
  • the object of the invention is to create a work spindle of the generic type in which the sensor device measures the axial position of the tension rod head in the clamping position in relation to a fixed point on the work spindle and from the measured value signal taking into account the influence of changes, the release signal for the spindle start is formed.
  • This object is achieved in a work spindle of the generic type according to the invention by the characterizing features of claim 1.
  • the measuring beam which is aligned either coaxially, axially parallel or obliquely to the spindle axis with a directional component parallel thereto, provides an exact measured value for the distance between the fixed location on the working spindle and the clamping rod head in its clamping position, the can be compared with a reference value in the evaluation unit. If the measured length value determined via the measuring beam changes and the tool concerned is still properly clamped in the clamping position of the clamping rod, then the reference value stored in the evaluation unit can be easily adapted to this.
  • the invention is explained in more detail below with reference to the drawing using an exemplary embodiment.
  • the drawing shows a schematic longitudinal section through a work spindle for a machine tool.
  • a tool holder 1 can be seen at the lower end of the work spindle, which is equipped with a clamping device in order to be able to hold tools 2 which have a radial stop collar 3 and a hollow shaft taper 5.
  • the tool 2 rests with its stop collar 3 against a stop 4, such as a lower stop surface of the tool holder 1, whereby the axial position of the hollow shaft taper 5 in a corresponding hollow taper 16 of the tool holder 1 is predetermined.
  • clamping elements 6 engage the hollow shaft 5 of the tool 1 and exert a tensile force on the tool 2 in order to hold it securely in its stop collar 3 on the stop 4 of the tool holder 1.
  • the clamping elements 6 are essentially movable inwards in the radial direction with their engaging ends. The outwardly spread position of the clamping elements 6 is accordingly their clamping position.
  • the axial tensile force required for clamping the respective tool 2 is transmitted to the clamping elements 6 by a clamping rod 7 which is guided coaxially through the work spindle.
  • the tension rod 7 is acted upon by coaxially surrounding springs 8 which act on the tension rod 7 in such a way that the latter is pressed upwards when the work spindle is oriented vertically.
  • Clamping rod 7 can be moved down to the tool holder 1, and an ejection cylinder 10 is used, which is arranged coaxially with the clamping rod 7 above it and acts on a clamping rod head 9 formed at the upper end of the clamping rod 7.
  • the clamping rod head 9 In the clamping position, in which the tool 2 is properly clamped in the tool holder 1, the clamping rod head 9 assumes an upper end position, which is taken as a reference for releasing the start of the work spindle. For this purpose, the distance of the spindle head 9 from a fixed location on the work spindle is measured and compared with a predetermined length value.
  • the sensor device 11 has an optical transmitter 12 and an optical receiver 13, the transmitter 12 generating an optical measuring beam 14, which passes coaxially downward through the ejection cylinder 10.
  • the ejection cylinder 10 has an axially continuous bore 15 which opens at the lower end of the ejection cylinder 10 towards the tension rod head 9.
  • the optical measuring beam 14 thus strikes the tension rod head 9 and is reflected by it, so that the reflected part of the measuring beam 14 strikes the receiver 13 of the sensor unit 11.
  • the length of the measuring beam between the sensor device 11 and the tension rod head 9 can be determined in an evaluation unit, not shown in the drawing, for which different methods are sufficiently known. It is crucial that a change in the axial position of the tension rod head 9 is reliably detected further away from the tool holder 1, which is due to the entire clamping device being set and has no influence on a correct clamping position of the tool 2. In this way, the length value determined in the evaluation unit via the measuring beam can be compared with a reference value which, depending on the axial position changes of the tension rod head 9, is newly specified or immediately programmed differently in order to match the start-up release signal for if the length value supplied by the measuring beam and the reference value match Generate work spindle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Gripping On Spindles (AREA)

Abstract

Cet arbre moteur comporte un dispositif de serrage muni d'une tige de serrage (7) qui est mue par ressort et agit sur des éléments de serrage (6) pouvant s'engager dans un cône de corps creux de l'outil (2) correspondant. La position serrée correcte de l'outil (2) monté est déterminée au moyen de la position axiale de la tête (9) de la tige de serrage, à l'aide d'un système détecteur (11) qui produit un signal de lancement pour la mise en marche de l'arbre moteur. Ce système détecteur (11) comporte un émetteur (12) et un récepteur (13) d'un faisceau de mesure (14) dont la longueur peut être déterminée dans une unité d'évaluation. Ce faisceau de mesure, dirigé dans le sens de la course de la tête de la tige de serrage, ou bien approximativement dans cette direction, s'étend entre la tête de la tige de serrage (9) et un point de l'arbre moteur, fixe par rapport au bâti; sa longueur est comparée dans l'unité d'évaluation avec une valeur de longueur introduite ou préprogrammée, et si ces deux valeurs coïncident, le signal de lancement de la mise en marche est produit.
PCT/EP1997/003659 1996-07-25 1997-07-10 Arbre moteur pour machine-outil WO1998004377A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97936635A EP0876237A2 (fr) 1996-07-25 1997-07-10 Arbre moteur pour machine-outil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996129991 DE19629991A1 (de) 1996-07-25 1996-07-25 Arbeitsspindel für eine Werkzeugmaschine
DE19629991.8 1996-07-25

Publications (2)

Publication Number Publication Date
WO1998004377A2 true WO1998004377A2 (fr) 1998-02-05
WO1998004377A3 WO1998004377A3 (fr) 1998-03-26

Family

ID=7800781

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/003659 WO1998004377A2 (fr) 1996-07-25 1997-07-10 Arbre moteur pour machine-outil

Country Status (3)

Country Link
EP (1) EP0876237A2 (fr)
DE (1) DE19629991A1 (fr)
WO (1) WO1998004377A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111886100A (zh) * 2019-02-27 2020-11-03 萨卡多机电学有限公司 电主轴

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1309309B1 (it) 1999-06-30 2002-01-22 Hsd Srl Elettromandrino.
JP2001315010A (ja) * 2000-05-08 2001-11-13 Mori Seiki Co Ltd 工作機械
JP2004524986A (ja) 2001-05-15 2004-08-19 パウル・ミユーラー・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング・ウント・コンパニー・コマンデイトゲゼルシヤフト・ウンターネーメンスベタイリグンゲン 改良された機械加工精度をもつモータスピンドルとそのようなモータスピンドルを運転する方法
DE502007001543D1 (de) 2007-05-15 2009-10-29 Hueller Hille Gmbh Motorbetriebene Arbeits-Spindel für eine Werkzeug-Maschine
CH705129B1 (it) * 2011-06-17 2015-06-30 Mario Baldaccini Meccanica Di Prec E Dispositivo a elettromandrino e processo per il cambio utensile con il detto dispositivo.
DE102013107791B4 (de) * 2013-07-22 2017-05-04 Chiron-Werke Gmbh & Co. Kg Werkzeugmaschine
DE102016108407A1 (de) * 2016-05-06 2017-11-09 Ott-Jakob Spanntechnik Gmbh Löseeinrichtung für einen Werkzeug- oder Werkstückspanner
DE102020126006A1 (de) * 2020-10-05 2022-04-07 Sterman Technische Systeme Gmbh Spannvorrichtung, Spindelanordnung sowie Werkzeugmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304513A (en) * 1978-02-23 1981-12-08 Hurco Manufacturing Company, Inc. Milling machine including improved tool knock-out means
DE3509922C1 (de) * 1985-03-19 1986-06-19 Carl Hurth Maschinen- und Zahnradfabrik GmbH & Co, 8000 München Spannvorrichtung zum Befestigen eines Werkstückhalters oder dergleichen an einer Spindel
FR2588492B1 (fr) * 1985-10-14 1989-05-26 Aerospatiale Porte-outil de securite pour machine-outil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111886100A (zh) * 2019-02-27 2020-11-03 萨卡多机电学有限公司 电主轴

Also Published As

Publication number Publication date
DE19629991A1 (de) 1998-01-29
WO1998004377A3 (fr) 1998-03-26
EP0876237A2 (fr) 1998-11-11

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