WO2008101874A1 - Couplage réalisé entre un outil et un porte-outil pour des machines-outils - Google Patents

Couplage réalisé entre un outil et un porte-outil pour des machines-outils Download PDF

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Publication number
WO2008101874A1
WO2008101874A1 PCT/EP2008/051858 EP2008051858W WO2008101874A1 WO 2008101874 A1 WO2008101874 A1 WO 2008101874A1 EP 2008051858 W EP2008051858 W EP 2008051858W WO 2008101874 A1 WO2008101874 A1 WO 2008101874A1
Authority
WO
WIPO (PCT)
Prior art keywords
shank
tool
cylindrical
diameter
seat
Prior art date
Application number
PCT/EP2008/051858
Other languages
English (en)
Inventor
Egisto Nannini
Original Assignee
It.Te.Di. S.R.L.
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 It.Te.Di. S.R.L. filed Critical It.Te.Di. S.R.L.
Publication of WO2008101874A1 publication Critical patent/WO2008101874A1/fr

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
    • B23B31/005—Cylindrical shanks of tools
    • 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
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection

Definitions

  • the present invention relates to a tool holder-tool coupling for machine tools, particularly machine tools which perform very high precision machining.
  • Machines which use tools with a coupling shank and tool holder means, which in some machines are constituted by a spindle provided with a receptacle in which the tool is fixed in order to be turned axially.
  • the coupling between the shank of the tool and the receptacle in the tool holder assembly designed to receive it provides, in the tool, a conical shank and, in the corresponding tool holder assembly, a frustum-shaped cavity, as well as axial screw-type traction means, by way of which the shank of the tool is pulled toward the tool holder assembly.
  • the tool further has, at the widest end of its shank, an annular abutment surface which contrasts against a corresponding surface on the tool holder assembly, so as to stabilize the position of the tool in the coupled state.
  • the perfect positioning of the tool and therefore its perfect coaxial position with respect to the tool holder should be ensured by the coaxial guiding surfaces, by the flat contrast surfaces, and by the traction of the means, normally of the screw type, with which the tool is pulled axially into the seat of the tool holder.
  • Such configurations, combinations of parts and axial stresses do not ensure the perfect positioning of the tool, particularly when it has been inserted and removed several times from the seat that accommodates its shank.
  • the conical surfaces should in fact adhere to each other simultaneously with respect to the contrast and abutment surfaces which have an annular shape; this, however, does not occur, since either the conical surfaces adhere or the contrast surfaces adhere, particularly after the corresponding surfaces have undergone deformations and wear, albeit micrometric, due to repeated mounting and removal of the tool.
  • the axial traction of the screw means after repeated activation-deactivation, is imperfect due to the deformations that the threads of the two coupled parts undergo.
  • the tool holder assembly at the seat intended to accommodate, and thus interact with, the shank of the tool, is instead shaped and sized so as to undergo such elastic deformations that the frustum-shaped body of the shank, under the traction of the screw-type axial traction means, presses against the frustum-shaped surface of the seat that accommodates it in the tool holder assembly and causes its elastic deformation, until the annular adhesion surface at the top of the shank adheres against the corresponding contrast and abutment surface in the tool holder.
  • the aim of the present invention is to provide a coupling between the shank of the tool and the shank receptacle in the tool holder which is easy to provide and therefore entails a low cost.
  • an object of the present invention is to provide a tool shank-shank receptacle coupling in the tool holder which is structured so as to allow quick and safe replacement of one tool with another one or reinsertion of the same tool in the seat that accommodates its shank.
  • Another object of the invention is to provide a coupling of the shank of the tool with the seat intended to accommodate it in the tool holder assembly which is safe and precise, even after many mountings and removals of the tool in or from the tool holder.
  • a coupling provided with means thus shaped is advantageous because the machinings required on the shank and on the seat intended to receive it, being cylindrical, are easy to provide even when the required tolerances are on the order of microns.
  • the first cylindrical portion of the shank does not require particular precisions, since it is designed to facilitate the match-up of said shank in the seat intended to accommodate it.
  • the blending between the two cylindrical portions of the shank can be frustum-shaped or can even have a curved profile, since it has the function of facilitating the completion of the coupling of the shank with the seat adapted to receive it and therefore to guide the wider cylindrical segment of the shank into a coaxial position with respect to the seat intended to receive it, after the smaller portion has been inserted in said seat.
  • the substantially identical diameters of the wider cylindrical segment of the shank and of the wider cylindrical cavity in the seat intended to receive it make the coupling substantially perfect.
  • the length of the wider cylindrical portion of the seat in the tool holder which is slightly greater than the length of the wider cylindrical segment of the shank ensures adhesion between the contrast surfaces: the surface of the shank and the surface of the tool holder thus ensuring their axial parallelism.
  • Figure 1 is a front view of the shank of the tool;
  • Figure 2 is an exemplifying axial sectional view of the shank of
  • Figure 3 is a front view, in a different scale, of the shank of the tool and of the seat intended to receive it in the tool holder, separated from each other, both shown in cross-section along an axial plane and reproduced only in the part that relates to their coupling.
  • the drawings of the exemplifying type, are provided with the sole purpose of facilitating the understanding of the invention, without constituting any limitation thereof.
  • the invention relates to the particular shape and structure of the parts which, by moving, determine the coupling between the seat provided in the tool holder assembly and the rear part or shank of the tool.
  • the tool is provided with a cylindrical coupling shank 1 which protrudes from a flat contrast surface 6 which is oriented along a plane which is normal to the axis of the tool to which it belongs.
  • a corresponding seat 2 in the tool holder assembly is delimited at the front by a flat contrast surface 7, which is oriented along a plane which is normal to the axis of the cavity or seat 2, said cavity or seat having a cylindrical shape and a diameter which is adapted to receive internally the shank 1 of the tool.
  • the shank 1 is constituted by two cylindrical segments 4 and 3 in mutual succession, with a diameter which increases starting from the outermost one 3, the two cylindrical segments 4 and 3 being joined by a blending surface 5.
  • Such blending surface is frustum-shaped, with an inclination on the axis of the shank comprised between 60° and 15°, while starting from the outer end of said shank it has a length comprised between 0.3 and 1.5 times its diameter, as specified hereinafter from the functional aspect.
  • the cavity or seat 2 in the tool holder assembly, intended to receive the shank 1 is constituted by two cylindrical cavities 8 and 9 in succession which are mutually coaxial and separated by an annular blending surface, the outermost cavity 8 having a larger diameter equal to the diameter of the wider cylindrical segment 4 of the shank 1 , increased by a few thousandths of a millimeter, and being longer than the wider cylindrical segment 4 of the shank 1, so that the play between them is minimal and barely sufficient to allow them to perform mutual axial sliding movements.
  • the cylindrical cavity 8 has a diameter which is equal to the diameter of the wider cylindrical segment 4 of the shank 1 with an increase comprised between 1 and 10 thousandths of a millimeter and normally comprised between 2 and 5 thousandths of a millimeter.
  • the shank 1 and the cavity or seat 2, thanks to the cylindrical segment 3 of the shank 1 which is narrower than the hollow portion 8 of the seat 2, are mutually coupled with relative ease, thus allowing the tool to be arranged in a substantially coaxial position with respect to the cavity that must accommodate it in its rear part or shank.
  • the annular portion 5 that joins the cylindrical segments 3 and 4 of the shank 1 has such a taper as to facilitate the insertion and sliding of the cylindrical segment 4 within the cylindrical portion 8 of substantially the same width in the cavity 2, therefore such as to prevent jamming of the cylindrical segment 4 and at the same time the excessive elongation of the shank 1 for an equal length of the cylindrical segment 4 which is the part of the shank that keeps it positioned within the cavity 2.
  • the shank 1 in the embodiment exemplified in the drawings, has the initial portion which is cylindrical with at least one facet 10, which by interacting with a corresponding flat surface 1 1 in the tool holder assembly turns said tool, while the axial traction means through a cavity 13 in the tool holder assembly reach a threaded cavity 12 within the shank 1 , applying thereto traction until the contrast surfaces 7 and 6 adhere to each other.
  • the tool holder and the tool may be shaped in any manner, without altering the parts intended to mate, the shape of which constitutes the foundation of the invention, as defined by the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

La présente invention concerne le couplage réalisé entre le corps (1) d'un outil et un logement correspondant (2) d'un ensemble porte-outil, avec un corps formé de deux segments cylindriques (3, 4) dont le diamètre augmente à partir du segment le plus externe (3), lesdits segments étant reliés par une surface de liaison (5). Le segment cylindrique (4) le plus grand se termine sur la surface de contraste annulaire plate (6) qui est perpendiculaire à l'axe de l'outil, le logement (2) étant délimité à l'avant par la surface de contraste plate (7) et présentant une forme égale aux deux cavités cylindriques (8, 9) successives, la cavité la plus grande (8) ayant un diamètre qui est égal au diamètre du segment cylindrique (4) du corps (1) augmenté de quelques millièmes de millimètre et ayant une longueur qui est supérieure à la longueur de la partie cylindrique.
PCT/EP2008/051858 2007-02-22 2008-02-15 Couplage réalisé entre un outil et un porte-outil pour des machines-outils WO2008101874A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAR2007U000002 2007-02-22
ITAR20070002 ITAR20070002U1 (it) 2007-02-22 2007-02-22 Accoppiamento portautensile-utensile per macchine utensili

Publications (1)

Publication Number Publication Date
WO2008101874A1 true WO2008101874A1 (fr) 2008-08-28

Family

ID=39295994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/051858 WO2008101874A1 (fr) 2007-02-22 2008-02-15 Couplage réalisé entre un outil et un porte-outil pour des machines-outils

Country Status (2)

Country Link
IT (1) ITAR20070002U1 (fr)
WO (1) WO2008101874A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103744349A (zh) * 2013-10-08 2014-04-23 华中科技大学 一种平头立铣刀加工过渡曲面的无干涉刀具路径生成方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433104A (en) * 1966-10-26 1969-03-18 Valeron Corp Adjustable dovetail boring bar
EP1193011A1 (fr) * 2000-10-02 2002-04-03 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Raccordement d'outil
EP1308229A1 (fr) * 2001-11-01 2003-05-07 Big Alpha Co., Inc. Port-outil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433104A (en) * 1966-10-26 1969-03-18 Valeron Corp Adjustable dovetail boring bar
EP1193011A1 (fr) * 2000-10-02 2002-04-03 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Raccordement d'outil
EP1308229A1 (fr) * 2001-11-01 2003-05-07 Big Alpha Co., Inc. Port-outil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103744349A (zh) * 2013-10-08 2014-04-23 华中科技大学 一种平头立铣刀加工过渡曲面的无干涉刀具路径生成方法

Also Published As

Publication number Publication date
ITAR20070002U1 (it) 2007-05-24

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