WO2022228772A1 - Mandrin rétractable et procédé de fonctionnement associé - Google Patents

Mandrin rétractable et procédé de fonctionnement associé Download PDF

Info

Publication number
WO2022228772A1
WO2022228772A1 PCT/EP2022/057023 EP2022057023W WO2022228772A1 WO 2022228772 A1 WO2022228772 A1 WO 2022228772A1 EP 2022057023 W EP2022057023 W EP 2022057023W WO 2022228772 A1 WO2022228772 A1 WO 2022228772A1
Authority
WO
WIPO (PCT)
Prior art keywords
shrink
chuck
receiving bore
wall
slot
Prior art date
Application number
PCT/EP2022/057023
Other languages
German (de)
English (en)
Inventor
Klaus Schüssler
Original Assignee
KARL SCHÜSSLER GmbH & Co. KG
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 KARL SCHÜSSLER GmbH & Co. KG filed Critical KARL SCHÜSSLER GmbH & Co. KG
Publication of WO2022228772A1 publication Critical patent/WO2022228772A1/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
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/117—Retention by friction only, e.g. using springs, resilient sleeves, tapers
    • B23B31/1179—Retention by friction only, e.g. using springs, resilient sleeves, tapers using heating and cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/22—Compensating chucks, i.e. with means for the compensation of irregularities of form or position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/082—Holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/124—Screws
    • 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
    • B23B2270/06—Use of elastic deformation
    • 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
    • B23B2270/12—Centering of two components relative to one another
    • 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
    • B23B2270/48—Measuring or detecting

Definitions

  • the invention relates to a shrink chuck for clamping an object (e.g. tool) and an associated operating method.
  • Shrink chucks are known from the prior art (e.g. DE 10 2016 005 081 A1, DE 20 2010012 344 U1, DE 20 2014008 275 U1), which are well suited for rotating tools (e.g. milling machines) with high concentricity in a machine tool (e.g. milling machine). Flierzu the shrink fit chuck is heated, whereby a receiving bore of the shrink fit chuck widens. The tool (e.g. milling cutter) can then be inserted into the widened mounting hole of the shrink fit chuck. During the subsequent cooling of the shrink fit chuck, the tool is then clamped in the shrink fit chuck. Shrink chucks of this type already have a very high level of concentricity.
  • the invention is therefore based on the task of increasing the concentricity of a shrink chuck.
  • the invention includes a corresponding operating method for such a shrink chuck.
  • the shrink chuck according to the invention is generally suitable for clamping an object, such as a tool (eg milling cutter) in a machine tool (eg milling machine).
  • a tool eg milling cutter
  • the invention is not limited to tools or milling cutters with regard to the object to be clamped, but is generally suitable for clamping objects in a shrink chuck.
  • the shrink fit chuck according to the invention initially has, in accordance with the known shrink fit chucks, a receiving bore which serves to receive the object to be clamped (eg milling cutter), the receiving bore being surrounded on the outside by a wall.
  • the shrink chuck according to the invention is now characterized by deformation means that make it possible to elastically deform the wall of the receiving bore and thereby improve the concentricity of the shrink chuck.
  • the deforming means according to the invention make it possible for the wall of the receiving bore to be deformed in order to improve the concentricity.
  • the deformation means comprise several adjustment options (e.g. adjustment screws) in order to adjustably deform the wall of the receiving bore and thereby improve the concentricity.
  • adjustment options e.g. adjustment screws
  • three adjustment options can be provided, but the shrink chuck according to the invention can also have more adjustment options.
  • the individual setting options preferably enable an adjustable deformation with a local focus at different points on the wall of the receiving bore, with the setting options preferably being distributed over the circumference of the shrink fit chuck.
  • the deformation means for deforming the wall of the receiving bore comprise at least one slot in the wall of the receiving bore, wherein the at least one slot enables the elastic deformation of the wall of the receiving bore, which improves the concentricity of the shrink fit chuck.
  • the at least one slot lies in a plane that runs at right angles to the axis of rotation of the shrink fit chuck, with the slot extending in the circumferential direction, specifically over an angle that is on the outer circumference of the wall of the receiving bore, for example in the range of 50 °-110°, 60°-110° or 70°-90°.
  • the slot here preferably starts from the outer lateral surface of the wall and extends radially inward, with the slot extending in the radial direction from the outside, preferably only over part of the wall thickness of the wall of the receiving bore, so that the slot extends from the outside coming does not go through to the location hole.
  • the slot does not form a continuous opening the wall of the mounting hole.
  • the at least one slot has a bottom radially on the inside, which in the preferred embodiment is preferably concave in cross section perpendicular to the axis of rotation of the shrink fit chuck, in particular in the shape of a circular arc, which is favorable in terms of production.
  • the shrink chuck in the wall of the receiving bore not only has a single slot, but several slots, which are preferably distributed over the circumference.
  • the number of slots the invention is not limited to a specific number. In the preferred embodiment of the invention, however, three slots are provided distributed over the circumference.
  • the slots are preferably arranged equidistantly in the circumferential direction and can all have the same width in the axial direction. Furthermore, it should be mentioned that all slots can extend over the same angle in the circumferential direction. It should also be noted that preferably all of the slots lie in a common plane which is perpendicular to the axis of rotation of the shrink fit chuck, i.e. the slots are not axially offset from one another. In this case, the slots are preferably arranged rotationally symmetrically with respect to the axis of rotation of the shrink fit chuck, so as not to cause any imbalance in the shrink fit chuck.
  • the deformation means for deforming the wall of the receiving bore comprise at least one slot.
  • the deformation means preferably also comprise at least one threaded bore with an internal thread, where the threaded bore preferably starts from the end face of the wall of the shrink chuck, preferably runs axially and preferably opens into the slot.
  • a screw e.g. grub screw
  • a plurality of threaded bores are distributed over the circumference in the wall of the receiving bore, which preferably each open into an associated slot, as explained above.
  • three threaded holes and correspondingly three slots and three threaded pins there are three adjustment options on the shrink chuck to increase the concentricity.
  • the deformation means according to the invention can also have a different number of adjustment options.
  • the invention is not limited to the above-described exemplary embodiment with regard to the structural design of the deforming means, where the deforming means comprise the slots, the threaded holes and the threaded pins. Rather, the deformation of the wall of the receiving bore to improve the concentricity can also be realized in a different way.
  • the receiving bore for the object to be clamped preferably has a proximal section and a distal section with a first internal cross-section, these two sections serving to clamp the object to be clamped.
  • a middle section which has a second internal cross-section, the middle section preferably being located in the axial direction in the area in which the slots are also located.
  • the middle section of the receiving bore thus includes the at least one slot with its axial extent.
  • the second internal cross section of the central section is preferably larger than the first internal cross section of the distal or proximal section of the receiving bore.
  • the inner cross-section of the middle section can be turned freely for this purpose.
  • the larger internal cross section in the area of the central section of the mounting hole makes it possible for the wall of the mounting hole to be deformed in this section.
  • the shrink chuck according to the invention preferably has a mounting interface for mounting the shrink chuck in a machine tool, as is known per se from the prior art.
  • this assembly interface can be a standard cone interface, in particular according to the technical standard DIN 69893.
  • standard cone interfaces are known per se from the prior art and therefore do not have to be described in more detail.
  • the shrink fit chuck can also have balancing bores in its lateral surface, into which balancing screws can be screwed in order to balance the shrink fit chuck.
  • these balancing bores run radially.
  • the shrink chuck according to the invention preferably has a ring-shaped circumferential and radially outwardly protruding collar, which is arranged in the axial direction between the mounting hole for the milling cutter on the one hand and the assembly interface on the other.
  • a ring-shaped circumferential gripping groove for gripping the shrink chuck or an axially running notch can be arranged, which is also known as the "German corner".
  • Driving groove can be arranged for indexing.
  • the operating method according to the invention initially provides in one step that the shrink fit chuck is heated in order to widen the receiving bore in the shrink fit chuck, as is known per se from the prior art.
  • the object to be clamped e.g. tool
  • the object to be clamped can be inserted into the widened mounting hole of the heated shrink fit chuck.
  • the shrink-fit chuck is then cooled down with the object (e.g. tool) in it, whereby the object is clamped in the shrink-fit chuck.
  • object e.g. tool
  • the operating method according to the invention still reflects the state of the art.
  • the inventions to the invention operating method is now characterized in that the wall of the receiving bore of the shrink fit chuck is elastically deformed after cooling of the shrink fit chuck with the clamped object in order to improve the concentricity.
  • this deformation can be brought about by turning the screws described above in the threaded holes in the wall of the receiving hole.
  • the concentricity of the shrink fit chuck is measured in each case in order to be able to assess whether the concentricity has been improved by turning the screws and is sufficient.
  • the elastic deformation of the wall of the receiving bore and the measurement of the concentricity accuracy is then preferably repeated until the concentricity reaches a PRE-enclosed minimum value.
  • the concentricity can be measured in a special concentricity tester.
  • a dial gauge there is also the alternative option of measuring the concentricity in a machine tool, for example using a dial gauge.
  • FIG. 1 shows a perspective view of a shrink chuck according to the invention without the tool to be clamped.
  • FIG. 2 shows the perspective view from FIG. 1 with the clamped tool.
  • Figure 3 shows a longitudinal sectional view through the shrink fit chuck according to Figures 1 and 2.
  • Figure 4 shows a cross-sectional view along section line A-A in Figure 3.
  • FIG. 5 shows a cutaway perspective view through the shrink fit chuck according to the figures
  • Figure 6 shows an enlarged longitudinal sectional view through the shrink fit chuck according to Figures 1-5.
  • FIG. 7 shows another enlarged longitudinal sectional view through the shrink fit chuck according to FIGS. 1-6.
  • FIG. 8 shows a cross-sectional view through the shrink fit chuck according to FIGS. 1-7.
  • FIG. 9 shows the operating method according to the invention in the form of a flow chart.
  • Figure 10 shows a modification of Figure 6.
  • the drawings show a shrink fit chuck 1 according to the invention, the basic func tion and the structure of the shrink fit chuck 1 being known from the publications described above, so that the content of the present description with regard to the functioning of the shrink fit chuck 1 is to be attributed.
  • the shrink fit chuck 1 initially has a standard mounting interface 2 in order to be able to mount the shrink fit chuck 1 in a machine tool.
  • the shrink-fit chuck 1 has an annular collar 3 in the middle.
  • a ring-shaped circumferential gripping groove 4 which makes it possible to grip the shrink chuck 1 in an automated manner.
  • driver groove 6 for indexing in the outer surface of the collar 3 running in the form of a ring.
  • the shrink-fit chuck 1 has a receiving bore 7 in which a tool 8 (e.g. milling cutter) can be clamped, with the tool 8 only being shown schematically here.
  • the receiving bore 7 for the tool 8 is delimited on the outside by a wall 9 .
  • balancing bores 10, 11 In the wall 9 of the receiving bore 7 there are radially extending balancing bores 10, 11, each having an internal thread and balancing screws (not shown) aufneh men to balance the shrink fit chuck 1.
  • the invention is characterized in that three slots 12 , 13 , 14 are arranged in the wall 9 of the receiving bore 7 , which lie in a common plane which runs at right angles to the axis of rotation 15 of the shrink fit chuck 1 .
  • the three slots 12-14 are arranged equidistantly over the circumference of the wall 9 of the receiving bore 7 and each extend over an angle a «75°.
  • the slots 12-14 start from the outer lateral surface of the wall 9 of the receiving bore 7 and extend radially inwards to a certain depth. However, the slots 12-14 do not penetrate the wall 9 completely and therefore do not extend into the receiving bore 7. The slots 12-14 therefore do not form any openings in the wall 9 of the receiving bore 7. In this exemplary embodiment, the slots 12-14 extend in the radial direction only over approximately 70% of the wall thickness of the wall 9 of the receiving bore 7.
  • the threaded pins 19-21 can be supported with its free end on a slot edge 22 of the slots 12-14 from.
  • the threaded pin 19 is screwed in, it is thus supported on the slot flank 22 of the slot 12 , which causes the slot 12 to widen. As a result, the width b of the slot 12 is increased.
  • the slots 12-14 thus form with the threaded pins 19-21 and the threaded holes 16-18 deformation means that make it possible to deform the wall 9 of the receiving bore 7 for the tool 8 in order to improve the concentricity.
  • the slots 12-14 each have a base 23-25 which runs in the shape of a circular arc, which is favorable in terms of production technology.
  • the receiving bore 7 has a proximal section 26, a middle section 27 and a distal section 28, which are each cylindrical but have different inner diameters d1 and d2.
  • the proximal section 26 and the distal section 28 are used here to clamp the tool 8 and therefore have the same inner diameter d1.
  • the middle section 27, on the other hand, has a larger inside diameter d2>dl and is therefore not used to clamp the tool 8.
  • the larger inside diameter Knife d2 in the middle section 27 allows a deformation of the wall 9 of the receiving bore 7 in this area. This is advantageous because the slots 12-14 are also located in this axial area of the section 27, so that deformations take place in this area due to the expansion of the slots 12-14.
  • a first step S1 the shrink fit chuck 1 is first heated in order to widen the receiving bore 7 of the shrink fit chuck 1.
  • a second step S2 the tool 8 is then inserted into the receiving bore 7 of the heated shrink fit chuck 1.
  • the shrink fit chuck 1 is then cooled, as a result of which the tool 8 is clamped in the shrink fit chuck 1.
  • the concentricity of the tool 8 clamped in the shrink chuck 1 is then measured.
  • this measurement of the concentricity can be carried out in a concentricity tester.
  • step S5 it is then checked whether the concentricity is correct. If this is the case, the shrink fit chuck 1 can be used for machining the workpiece.
  • Step S6 the threaded pins 19-21 are rotated in order to deform the wall 9 of the receiving bore 7. Steps S4-S6 are then repeated until the concentricity is correct.
  • FIG. 10 shows a longitudinal sectional view of a modified exemplary embodiment which largely corresponds to the exemplary embodiment described above, so that to avoid repetition, reference is made to the above description, with the same reference numbers being used for corresponding details, but marked with an apostrophe to distinguish them.
  • a special feature of this embodiment is that instead of the threaded pins 19-21, a screw 19' with a screw head 29' is provided, the screw head 29' being able to be supported on the end face of the wall 9'.
  • the threaded bores 16' only have an internal thread on the proximal side (ie to the right of the slot 12' in the drawing), in which the screw 19' engages.
  • the threaded bores 16' do not have an internal thread, so that the screw 19' can initially be inserted into the threaded bore 16' without turning, specifically up to the internal thread behind slot 12'.
  • the screw 19' thus engages with its external thread in the internal thread of the threaded bore 16' behind the slot 12' and is supported with the screw head 29' on the end face of the wall 9'.
  • the screw 9' is tightened, the slot 12' is thus contracted axially, which leads to a deformation in order to improve the concentricity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

Mandrin rétractable et procédé de fonctionnement associé. L'invention concerne un mandrin rétractable (1) destiné à serrer un outil (8) dans une machine-outil, comprenant un trou de réception (7) destiné à recevoir l'outil (8) à serrer, et une paroi (9) qui entoure extérieurement le trou de réception (7). L'invention concerne un moyen de déformation (12) destiné à déformer élastiquement de manière réglable la paroi (9) du trou de réception (7) afin d'améliorer la concentricité en fonctionnement du mandrin rétractable (1).
PCT/EP2022/057023 2021-04-27 2022-03-17 Mandrin rétractable et procédé de fonctionnement associé WO2022228772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021110682.6 2021-04-27
DE102021110682.6A DE102021110682A1 (de) 2021-04-27 2021-04-27 Schrumpffutter und zugehöriges Betriebsverfahren

Publications (1)

Publication Number Publication Date
WO2022228772A1 true WO2022228772A1 (fr) 2022-11-03

Family

ID=81308418

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/057023 WO2022228772A1 (fr) 2021-04-27 2022-03-17 Mandrin rétractable et procédé de fonctionnement associé

Country Status (2)

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DE (1) DE102021110682A1 (fr)
WO (1) WO2022228772A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070226985A1 (en) * 2006-04-03 2007-10-04 Citation Corporation Apparatus and method for an adjustable tool holder
DE202010012344U1 (de) 2010-09-08 2010-11-18 KARL SCHÜSSLER GmbH & Co. KG Schnittstelle zum Verbinden eines Werkzeugs und/oder eines Werkzeughalters mit einer Werkzeugmaschine
DE202014008275U1 (de) 2014-10-16 2014-10-27 KARL SCHÜSSLER GmbH & Co. KG Spannsystem
DE102014226654A1 (de) 2014-12-19 2016-06-23 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Spannfutter
DE102016005081A1 (de) 2016-04-27 2017-11-02 KARL SCHÜSSLER GmbH & Co. KG Schrumpffutter
DE102018221005A1 (de) * 2018-12-05 2020-06-10 Audi Ag Spannfutter für ein Rotationswerkzeug

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070226985A1 (en) * 2006-04-03 2007-10-04 Citation Corporation Apparatus and method for an adjustable tool holder
DE202010012344U1 (de) 2010-09-08 2010-11-18 KARL SCHÜSSLER GmbH & Co. KG Schnittstelle zum Verbinden eines Werkzeugs und/oder eines Werkzeughalters mit einer Werkzeugmaschine
DE202014008275U1 (de) 2014-10-16 2014-10-27 KARL SCHÜSSLER GmbH & Co. KG Spannsystem
DE102014226654A1 (de) 2014-12-19 2016-06-23 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Spannfutter
DE102016005081A1 (de) 2016-04-27 2017-11-02 KARL SCHÜSSLER GmbH & Co. KG Schrumpffutter
DE102018221005A1 (de) * 2018-12-05 2020-06-10 Audi Ag Spannfutter für ein Rotationswerkzeug

Also Published As

Publication number Publication date
DE102021110682A1 (de) 2022-10-27

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