WO2018122592A1 - Structure métallique destinée à effectuer des traitements mécaniques - Google Patents

Structure métallique destinée à effectuer des traitements mécaniques Download PDF

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Publication number
WO2018122592A1
WO2018122592A1 PCT/IB2016/058121 IB2016058121W WO2018122592A1 WO 2018122592 A1 WO2018122592 A1 WO 2018122592A1 IB 2016058121 W IB2016058121 W IB 2016058121W WO 2018122592 A1 WO2018122592 A1 WO 2018122592A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal structure
face
axial
axis
groove
Prior art date
Application number
PCT/IB2016/058121
Other languages
English (en)
Other versions
WO2018122592A8 (fr
Inventor
Ugo Valentini
Original Assignee
Valentini Utensili Speciali Srl
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 Valentini Utensili Speciali Srl filed Critical Valentini Utensili Speciali Srl
Priority to EP16838006.1A priority Critical patent/EP3562609A1/fr
Priority to PCT/IB2016/058121 priority patent/WO2018122592A1/fr
Publication of WO2018122592A1 publication Critical patent/WO2018122592A1/fr
Publication of WO2018122592A8 publication Critical patent/WO2018122592A8/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • 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
    • B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
    • B23B2231/0204—Connection of shanks to working elements of tools
    • 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
    • B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
    • B23B2231/028—Lugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/04—Bayonet connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/12—Stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/02—Connections between the shanks and detachable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/04—Bayonet connections

Definitions

  • the present invention relates to a metal structure for performing machining operations, in particular, the invention finds beneficial application in the manufacture of cutting tools for chip removal machines and for equipment for performing machining operations without thereby any loss of generality.
  • Cutting tools of known type generally comprise a grip portion configured to be gripped by a gripping device of a chip removal machine tool; a shank; and an end portion configured to cut and remove the material being machined.
  • the gripping device of the machine tool can be a rotating mandrel when the chip removal machine tool is a drill or a milling machine, or a tool turret when the machine tool is a lathe.
  • the grip portion can assume various configurations although the market is oriented towards using a few configurations that over the years have become de facto standards.
  • the shank has the function of spacing out the end portion from the grip portion and, in many applications, to define waste channels for the chips that are produced in the cutting operations.
  • the end portion comprises cutting edges, which can be formed directly on the end portion or extend along the inserts, which are attached to the end portion by different techniques such as for example braze welding or screwing.
  • the cutting tool in its entirety must be made from high quality steels and subjected to heat treatment to ensure the best performance and durability.
  • the grip portion, the shank and the end portion perform different functions and the required mechanical characteristics of the parts of the cutting tool are different from one another and, for this reason, it has been found that the wear of the various parts of the cutting tool is not uniform, from which it follows that the cutting tool is worn when only one of the parts of the tool is worn.
  • the purpose of the present invention is to provide a metal structure for performing machining operations, in particular a cutting tool for chip removal machines or an apparatus for performing machining operations, which is free from the drawbacks of the prior art.
  • a metal structure for performing machining operations in particular a cutting tool for chip removal machine tools or an apparatus for performing machining operations, wherein the metal structure comprises at least one first and one second body, which extend respectively along a first axis and a second axis, are configured to achieve axial coupling to align the first and second axis and allow the relative rotation between the first and the second body, and at least one groove comprising two opposing undercuts; and at least one axial protrusion of a shape substantially complementary to the groove; the groove and the axial protrusion being configured in such a way that the said axial protrusion is progressively forced to interfere between the undercuts as a result of the relative rotation of the first and of the second body around the first and second mutually aligned axes.
  • the axial coupling ensures the alignment between the first and the second body and allows the first and the second body to rotate together for a certain angle, while the subsequent relative rotation of the first and second body achieves a forced coupling with interference between the first and the second body that ensures a good transmission of forces, structural continuity, and optimum transmission of forces between the first and the second body .
  • each undercut is delimited by first inclined faces, and by one bottom face of the groove.
  • the exchange of forces between the first and the second body takes place along the first inclined faces, the bottom face and the first abutting face, and thus along a relatively extended surface.
  • each first inclined face partly faces the bottom face.
  • each first inclined face is a conical face that extends along a respective cone with axis parallel to, and offset with respect to, the first and second axes. In this way, the forces exchanged between the first and the second body have radial and axial components .
  • the axial protrusion comprises two second inclined faces, which are inclined with respect to the first and second axes, and, in particular, each second inclined face is a conical face which extends along a cone with axis offset with respect to the first and second axes.
  • the cones along which the first inclined faces lie have a base diameter which is smaller than the base diameter along which the second inclined faces lie.
  • the first body has two grooves arranged on opposite sides with respect to the first axis
  • the second body has two axial protrusions, which are arranged on opposite sides with respect to the second axis and have a shape, at least in part substantially complementary to the grooves.
  • the axial protrusions extend along respective circle arc paths to an extent less than 90°.
  • said extent is slightly less than 90° so as to maximise the extent of axial protrusion and allow the axial insertion of the protrusion and the achievement of a groove with an engagement portion of extent equal to the extent of the axial protrusion.
  • each groove comprises an engagement portion and a portion configured to allow the axial insertion of an axial protrusion into the groove.
  • the metal structure comprises, in addition to the interference coupling, a safety mechanism to prevent rotation between the first and the second body.
  • the safety mechanism comprises two seats formed in the first body and two screws housed in the second body and configured to be selectively inserted into the said seats.
  • FIG. 1 is a perspective view, with parts removed for clarity, of a metal structure made in accordance with a first embodiment of the present invention
  • FIG. 2 is a cross-section view, with parts removed for clarity, of the metal structure of Figure 1 along the section line II-II;
  • Figures 3 and 4 are partially exploded perspective views, with parts removed for clarity, of the metal structure of Figure 1;
  • FIG. 8 is a longitudinal cross-section view, with parts removed for clarity and in enlarged scale, of a further detail of the metal structure of Figure 7 along the section line VIII-VIII;
  • FIG. 9 is a cross-section view, with parts removed for clarity and in enlarged scale, of a detail of the metal structure of Figure 2;
  • FIG. 14 is a plan view, with parts removed for clarity and in enlarged scale, of a detail of the metal structure of Figure 10.
  • the reference number 1 denotes in its entirety a metal structure, in this case a cutting tool for a chip removal machine and, in more detail, a drill tip.
  • the metal structure 1 has a substantially cylindrical shape and comprises two bodies 2 and 3 coupled together, has successively a grip portion 4a and a shank 4b along the body 2, and an end portion 4c associated with the body 3 and has cutting edges 5 to engage and cut the material being machined not shown in the attached figures.
  • the body 2 extends along an axis Al, while the body 3 extends along an axis A2 and is selectively couplable to the body 2. When the body 3 is coupled to the body 2 the axes Al and A2 are coincident.
  • the alignment of the bodies 2 and 3 is made possible by the coupling between a pin 6 which extends from the body 3 along the axis A2 and a cylindrical seat 7, which is formed in the body 2 and extends along the axis Al .
  • the pin 6 is integral with the body 2, while the cylindrical seat is formed in the body 3.
  • the body 2 has two channels 8, which are configured to remove the chips (not shown) produced in the cutting operations, extending along respective helical paths, and have concave cross-sections.
  • the body 2 has two channels 9, which are configured to remove the chips (not shown) produced in the cutting operations, and have identical cross-sections to the helical profiles of the channels 8 in such a way as to allow a perfect alignment of the channels 9 with the channels 8 when the body 3 is coupled to the body 2.
  • the channels 9 define the extension of the helical paths, along which the channels 8 extend.
  • the bodies have channels with different paths than helical paths and are different in number to two.
  • the coupling includes a step of axial insertion of a portion of the bodies 2 and 3 and the subsequent relative rotation between the bodies 2 and 3 of about 90° around the coincident axes Al and A2.
  • the body 2 has a groove 12 which extends between the two abutting faces 10 from a channel 8 to the opposite channel 8 and is delimited by a bottom face 13 and two laterally inclined faces 14 and 15, which converge toward the axis Al, arranged on opposite sides of the axis Al and forming respective undercuts 16 and 17 with the bottom face 13, and by two stop faces 18 and 19, which are adjacent to the respective inclined faces 14 and 15.
  • the body 3 has an axial protrusion 20, which is centrally arranged with respect to the axis A2 and is configured to be inserted by force into the groove 12, in particular into the undercuts 16 and 17 and retained by the body 2.
  • the axial protrusion 20 is arranged between the abutting faces 11, is laterally delimited by two inclined faces 21 and 22, by two stop faces 23 and 24, by two channels 9, and, at the end, by an end face 25.
  • the inclined faces 21 and 22 are divergent with respect to the axis A2 and form acute angles with the end face 25 as is better illustrated in Figure 8.
  • the inclined face 14 and the contiguous stop face 18 extend substantially along a circle arc of less than 90°.
  • the inclined face 15 and the contiguous stop face 19 extend along a circle arc of less than 90°.
  • the opposite ends of the axial protrusion 20 extend along respective circle arcs of less than 90°.
  • the rotation progressively suppresses the clearance and achieves an interference along both the inclined faces 14 and 22 and the inclined faces 15 and 21.
  • the inclined faces 14, 15, 21 and 22 are conical surfaces, i.e. are portions of the side surfaces of respective hypothetical cones, which are slightly offset with respect to the axes Al and A2 in such a way that the rotation about the coincident axes Al and A2 determines the radial approach of the inclined faces 14 and 22, on one side, and 15 and 21, on the other side, in a direction of rotation and the radial distancing of them for a rotation in the opposite direction.
  • the cones along which the inclined faces 14 and 15 lie have a base diameter which is smaller than the base diameter along which the inclined faces 21 and 22 lie, so as to produce an interference.
  • the forced coupling with interference along the inclined faces 14, 15, 21, and 22 also determines an axial compression between the bodies 2 and 3 and precisely along the bottom face 13 and the end face 25 and along the abutting faces 10 and 11.
  • the reference number 101 denotes in its entirety a metal structure which, in this case, is a cutting tool for a chip removal machine and, in more detail, a drilling tool.
  • the metal structure 101 comprises two bodies 102 and 103 coupled together, has successively a grip portion 104a and a shank 104b along the body 102, and an end portion 104c associated with the body 103 and has cutting edges 105 to engage and cut the material being machined not shown in the attached figures.
  • the body 102 extends along an axis Al, while the body 103 extends along an axis A2 and is selectively couplable to the body 102. When the body 103 is coupled to the body 102 the axes Al and A2 are coincident.
  • the body 102 has two channels 108, which are configured to remove the chips (not shown) produced in the cutting operations, extending along respective helical paths, and have concave cross-sections.
  • the body 103 has two channels 109, which are configured to remove the chips (not shown) produced in the cutting operations, and have identical cross-sections to the helical profiles of the channels 108 in such a way as to allow a perfect alignment of the channels 109 with the channels 108 when the body 103 is coupled to the body 102.
  • the channels 109 define the extension of the helical paths, along which the channels 108 extend.
  • the coupling includes a step of axial insertion of the two suitably shaped ends of the bodies 102 and 103, which includes, among other things, the insertion of the pin 106 into the cylindrical seat 107 and the subsequent relative rotation between the bodies 102 and 103 by about 90° around the coincident axes Al and A2.
  • the pin 106 is housed in the cylindrical seat 107, the abutting faces 111 are arranged in contact with the abutting faces 110, the stop faces 118 are in abutment respectively with the stop faces 123, the inclined faces 114 interfere with the inclined faces 122 and the inclined faces 115 interfere with the inclined faces 121.
  • the interference is obtained through the relative rotation between the bodies 102 and 103 after insertion of the pin 106 into the cylindrical seat 107.
  • This rotation determines the circumferential approach of the stop faces 118 and 123, on one side ( Figures 14 and 16) and the radial approach of the inclined faces 114 and 122, on one side, and 115 and 121, on the other side, until an interference between the axial protrusions 120 of the body 103 inside the groove 112 of the body 102 is achieved.
  • the inclined faces 114, 115, 121 and 122 are dimensioned in such a way that in the initial coupling phase of the axial protrusion 120 in the groove 112, i.e. the relative rotation between the body 102 and the body 103 there is a small clearance between the inclined faces 114 and 122, on one side and the inclined faces 115 and 121, on the other side.
  • the rotation progressively suppresses the clearance and achieves an interference along both the inclined faces 114 and 122 and the inclined faces 115 and 121.
  • the inclined faces 114, 115, 121 and 122 are conical surfaces, i.e. are portions of the side surfaces of respective hypothetical cones, which are slightly offset with respect to each other in such a way that the rotation about the coincident axes Al and A2 determines the radial approach of the inclined faces 114 and 122, on one side, and 115 and 121, on the other side, in a direction of rotation and the radial distancing of them for a rotation in the opposite direction.
  • the cones along which the inclined faces 114 and 115 lie have a base diameter which is smaller than the base diameter along which the inclined faces 121 and 122 lie.
  • the forced coupling with interference determines an axial compression between the bodies 102 and 103 along the bottom faces 113 ( Figure 15) and the end faces 125 (Figure 17) and along the abutting faces 110 and 111 ( Figure 18) .
  • the metal structure 101 comprises a safety mechanism to prevent accidental rotation between the body 102 and the body 103.
  • the safety mechanism provides that the body 102 has two conical seats 126, which are arranged in correspondence with the respective bottom faces 113; and the body 103 has threaded bores 127 which extend in correspondence with the axial protrusions 120 and which are aligned with the respective conical seats 126 when the bodies 102 and 103 are completely coupled together.
  • the metal structure 101 also comprises two screws 128, which are configured to be screwed into the threaded bores 127 and define the safety mechanism.
  • the metal structure 101 comprises a cooling channel 129 which extends along the bodies 102 and 103 and centrally through the pin 106.
  • the reference number 201 denotes in its entirety a metal structure which, in this case, is part of an apparatus for performing machining operations.
  • the metal structure 201 comprises two bodies 202 and 203 couplable to each other and having a substantially cylindrical shape. When the body 103 is coupled to the body 102 the axes Al and A2 are coincident.
  • the alignment of the bodies 202 and 203 is made possible by the coupling between a pin 206 which extends from the body 202 along the axis Al and a cylindrical seat 207 (Figure 20), which is formed in the body 203 and extends along the axis Al .
  • the pin 206 is integral with the body 203, while the cylindrical seat 207 is formed in the body 202.
  • the bodies 202 and 203 have respective abutting faces 210 and 211 that extend perpendicularly with respect to axes Al and A2 and are arranged in mutual contact as a result of the axial insertion .
  • the forced coupling with interference between the bodies 202 and 203 is achieved in the same manner as described with reference to the embodiment described with reference to Figures 10 to 18. It is evident that the present invention includes variants not explicitly described without thereby departing from the protective scope of the following claims.
  • the metal structure could be a turning tool.
  • the metal structure may comprise more than two bodies assembled together according to the methods described and claimed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Turning (AREA)

Abstract

L'invention concerne une structure métallique destinée à effectuer des opérations d'usinage, en particulier un outil de coupe (1) destiné à des outils de machine d'enlèvement de copeaux, comprenant des premier et second corps (2, 3), qui s'étendent respectivement le long d'un premier axe et d'un second axe (A1, A2), qui sont conçus pour réaliser un couplage axial en vue d'aligner les premier et second axes (A1, A2) et permettre la rotation relative entre les premier et second corps (2, 3), et une rainure (12) comprenant deux contre-dépouilles opposées (16, 17) ; et une saillie axiale (20) d'une forme sensiblement complémentaire de la rainure (12) ; la rainure (12) et la saillie axiale (20) étant conçues de sorte que la rotation relative des premier et second corps (2, 3) autour des premier et second axes mutuellement alignés (A1, A2) détermine un couplage forcé progressif avec une interférence entre les premier et second corps (2, 3) en correspondance avec les contre-dépouilles (16, 17).
PCT/IB2016/058121 2016-12-30 2016-12-30 Structure métallique destinée à effectuer des traitements mécaniques WO2018122592A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16838006.1A EP3562609A1 (fr) 2016-12-30 2016-12-30 Structure métallique destinée à effectuer des traitements mécaniques
PCT/IB2016/058121 WO2018122592A1 (fr) 2016-12-30 2016-12-30 Structure métallique destinée à effectuer des traitements mécaniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2016/058121 WO2018122592A1 (fr) 2016-12-30 2016-12-30 Structure métallique destinée à effectuer des traitements mécaniques

Publications (2)

Publication Number Publication Date
WO2018122592A1 true WO2018122592A1 (fr) 2018-07-05
WO2018122592A8 WO2018122592A8 (fr) 2018-11-22

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PCT/IB2016/058121 WO2018122592A1 (fr) 2016-12-30 2016-12-30 Structure métallique destinée à effectuer des traitements mécaniques

Country Status (2)

Country Link
EP (1) EP3562609A1 (fr)
WO (1) WO2018122592A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230022019A1 (en) * 2021-07-20 2023-01-26 Kennametal Inc. Modular drill apparatus with cutting tip in situ insert assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111054951B (zh) * 2019-12-06 2021-10-12 株洲钻石切削刀具股份有限公司 一种分体式旋转加工刀具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3235820A1 (de) * 1982-01-07 1983-07-14 Innse Innocenti Santeustacchio S.p.A., Brescia Vorrichtung zur befestigung eines zubehoerteils am werkstueckspindelstock einer werkzeugmaschine
EP0984841A1 (fr) * 1997-05-29 2000-03-15 Iscar Ltd. Outil de coupe combine et tete de coupe rempla able associee
US20120155978A1 (en) * 2009-08-18 2012-06-21 Jiroh Osawa Throw-away rotating tool
CH707765A2 (de) * 2013-03-11 2014-09-15 Gewitec Ag Bearbeitbarer Rohling für die Herstellung eines rotierenden oder stehenden Werkzeugs.
US20140348602A1 (en) * 2013-05-21 2014-11-27 Kennametal Inc. Coupling part for rotary tool and rotary tool including same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3235820A1 (de) * 1982-01-07 1983-07-14 Innse Innocenti Santeustacchio S.p.A., Brescia Vorrichtung zur befestigung eines zubehoerteils am werkstueckspindelstock einer werkzeugmaschine
EP0984841A1 (fr) * 1997-05-29 2000-03-15 Iscar Ltd. Outil de coupe combine et tete de coupe rempla able associee
US20120155978A1 (en) * 2009-08-18 2012-06-21 Jiroh Osawa Throw-away rotating tool
CH707765A2 (de) * 2013-03-11 2014-09-15 Gewitec Ag Bearbeitbarer Rohling für die Herstellung eines rotierenden oder stehenden Werkzeugs.
US20140348602A1 (en) * 2013-05-21 2014-11-27 Kennametal Inc. Coupling part for rotary tool and rotary tool including same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230022019A1 (en) * 2021-07-20 2023-01-26 Kennametal Inc. Modular drill apparatus with cutting tip in situ insert assembly
US11919094B2 (en) * 2021-07-20 2024-03-05 Kennametal Inc. Modular drill apparatus with cutting tip in situ insert assembly

Also Published As

Publication number Publication date
EP3562609A1 (fr) 2019-11-06
WO2018122592A8 (fr) 2018-11-22

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