EP3331658A1 - Tête de coupe remplaçable, tige d'outil et outil à tige - Google Patents

Tête de coupe remplaçable, tige d'outil et outil à tige

Info

Publication number
EP3331658A1
EP3331658A1 EP16745402.4A EP16745402A EP3331658A1 EP 3331658 A1 EP3331658 A1 EP 3331658A1 EP 16745402 A EP16745402 A EP 16745402A EP 3331658 A1 EP3331658 A1 EP 3331658A1
Authority
EP
European Patent Office
Prior art keywords
cutting head
support surface
tool
curved
shank
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.)
Pending
Application number
EP16745402.4A
Other languages
German (de)
English (en)
Inventor
Christian PAULWEBER
Roland Barbist
Johannes Glätzle
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.)
Ceratizit Austria GmbH
Original Assignee
Ceratizit Austria 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 Ceratizit Austria GmbH filed Critical Ceratizit Austria GmbH
Publication of EP3331658A1 publication Critical patent/EP3331658A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B23B31/1107—Retention by threaded connection for conical parts
    • B23B31/1122—Retention by threaded connection for conical parts using cylindrical threads
    • 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
    • B23C2210/00—Details of milling cutters
    • B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/32—Connections using screw threads

Definitions

  • the present invention relates to a replaceable cutting head, a tool shank for a rotary cutting tool and a rotary shank tool with a replaceable cutting head and a
  • rotating tools are often used which have a plurality of cutting edges. To be as good as possible
  • Carbide and cermets are particularly hard and wear-resistant materials, where hard materials, such as in particular
  • Carbides, carbonitrides, carbon oxides and / or Karbooxonitride of particular transition metals are embedded in a ductile metallic matrix, which may in particular predominantly cobalt, nickel and / or iron.
  • hard metals are often used in which hard
  • Tungsten carbide grains are embedded in a matrix of cobalt and / or nickel.
  • Form tools such as larger diameter cutters or drills as tools in which the cutters are formed by a plurality of carbide or cermet cutting inserts interchangeably mounted in respective receptacles on a tool shank which is commonly used e.g. made of tool steel.
  • rotating tools such as
  • a replaceable cutting head which consists of hard metal or cermet, at a free end of a tool shank made of a tougher material, such as tool steel, is releasably secured.
  • the replaceable cutting head can be an or have multiple cutting, which can be generated for example by grinding the cutting head.
  • WO 2013/106875 A1 describes a hard-material threaded connection in which an external thread and an inner thread cooperating therewith have a different thread pitch.
  • WO 96/06702 A1 describes a shank tool with a tool shank and a replaceable cutting head, which is formed by a one-piece carbide body and a threaded connection with the
  • Tool shank is connected.
  • the threaded connection is formed by an external thread formed on the cutting head and one therewith
  • Tool shank formed. On both sides of the external thread and the internal thread cooperating radial support surfaces are provided for a radial support. For the axial support are also provided.
  • Shank tools having a replaceable cutting head the problem that a material failure of the cutting head often occurs, in particular in the area between the external thread of the connecting portion and a working area in which the cutting edges are formed. It is an object of the present invention to provide an improved
  • the cutting head has a working area and an integrally formed with the working area connecting portion with an external thread.
  • the cutting head has a longitudinal axis. Between the working area and the external thread, a support surface for supporting on a corresponding contact surface of a tool shank is formed.
  • the support surface is formed curved in a section in a plane containing the longitudinal axis.
  • a support surface is in the present case a surface to understand that is designed so that the cutting head with this surface on the
  • the work area can e.g. already be provided with appropriate cutting for a machining. However, it is e.g. also possible that the work area still has a blank shape, in the first still the cutting (for example by a
  • the curved support surface may e.g. have a convex shape, a concave shape or combinations of these. Due to the curved design of the support surface an embodiment is selected, which is particularly well suited to the special
  • Non-curved surfaces such as cones or cylinders, can absorb forces perpendicular to the surface only from a certain direction, whereas curved surfaces in forces acting from different directions can absorb these perpendicular to the surface.
  • Perpendicular to the surface means that no dangerous tensile stresses occur.
  • the curved support surface may preferably extend in the radial direction substantially over the entire area between the external thread and the working area. However, it is e.g. It is also possible for one or more further surfaces to be present, which, however, cover significantly smaller partial regions in the radial direction overall.
  • the cutting head tapers in the region between the working area and the external thread
  • the external thread can in particular be designed as a substantially cylindrical thread. It is e.g. However, also possible that the outer diameter of the external thread tapers with increasing distance from the working area, in particular conically tapered.
  • External thread may have the tooth form of a standard thread, e.g. be designed as a metric rule thread, but there are also different tooth shapes possible, such. Round thread, rectangular thread,
  • the external thread is designed as a fine thread with low pitch and low thread depth.
  • the support surface is curved in such a way that it has a local radius of curvature r a 1 mm at each point in a section in a plane containing the longitudinal axis,
  • the radius of curvature can be over the entire support surface, e.g. have the same radius, e.g. can the
  • Supporting surface may be formed in particular as a partial surface of a tome, or the radius of curvature may also vary.
  • the support surface may have the shape of a partial surface of a tire or donut, in particular rotationally symmetrical with respect to the longitudinal axis of the cutting head
  • the support surface is concave curved.
  • the support surface can be produced in a reliable and cost-effective manner and simultaneously allows as a guide surface when screwing the cutting head a particularly good centering and
  • Diameter D a and the curved support surface extends between the external thread and the working region in the radial direction over a width A a 0.75 * (D a -d a ) / 2.
  • the difference in the radial extent between the working area and the external thread is largely bridged by the curved support surface, which allows a particularly reliable positioning and support in both the radial direction and in the axial direction.
  • a further support surface for supporting on a further corresponding contact surface of the tool shank is formed on the side remote from the working area of the external thread.
  • the further support surface can in particular directly to the
  • the further support surface can taper with increasing distance from the work area.
  • the further support surface may also be curved, in particular also concavely curved.
  • the further support surface may have a larger radius of curvature than the previously described support surface between the external thread and the working area.
  • the further support surface may also have the shape of a partial surface of a tire or donut, in particular the shape of a partial surface of a tom.
  • the curved support surface with a
  • the curved support surface thus has the properties of a surface blasted with a particle beam, in particular recognizable properties, which are due to the blasting treatment.
  • the blasted support surface can in particular
  • the curved support surface in a near-surface region compressive stresses whose formation controlled by the specific design of the blast treatment can be, in particular by the material used of the particles of the particle beam, the shape of the particles, the particle size, the jet pressure and the angle of incidence of the particle beam. In order to preserve the advantageous properties of the ground and then blasted support surface, this is preferably still not sanded after the blast treatment
  • the task is also performed by a tool shank for a rotating
  • the tool shank extends along a longitudinal axis and has a recess formed at a free end with an internal thread for receiving a replaceable cutting head, which has a corresponding external thread.
  • the tool shank points between the
  • the contact surface is formed curved in a section in a plane containing the longitudinal axis.
  • a contact surface is to be understood as meaning a surface which is designed such that a cutting head with a corresponding support surface is supported on it, thus touching it. Due to the curved shape of the
  • Cutting head allows, in particular, the properties of the typical material of such a cutting head, such as in particular carbide or cermet, taken into account.
  • a cutting head such as in particular carbide or cermet
  • curved contact surface may in particular have a convexly curved shape, a concavely curved shape or combinations of these.
  • the curved contact surface may preferably at least substantially of extend the outer circumference of the tool shank in the radial direction up to the diameter of the internal thread on the free end facing side.
  • the internal thread may be formed as a substantially cylindrical thread, but it is e.g. also possible that the internal thread tapers with increasing distance from the free end, in particular conically tapered.
  • the internal thread can in particular have a standard tooth form, as it is e.g. at a metric
  • Rule thread but e.g. also other thread forms such. Round thread, flat thread, sawtooth thread. Reinforced pipe thread, Whitworth pipe thread, UNC, UNF, trapezoidal thread, etc. possible.
  • the internal thread is designed as a fine thread with a low thread pitch and low thread depth.
  • the abutment surface is curved in such a way that, in a section in a plane containing the longitudinal axis, it has a local radius of curvature n 1 mm at each point,
  • the radius of curvature is sufficiently large to avoid too high local stress concentrations.
  • the radius of curvature may be e.g. over the entire extent of the
  • bearing surface substantially constant as it is e.g. in a partial area of a toms is the case.
  • the contact surface has a varying radius.
  • the contact surface is rotationally symmetrical with respect to the longitudinal axis and has the shape of a partial surface of a tire or donut.
  • the internal thread on its side facing the free end has a diameter di and the tool shank has a diameter D at its free end, and the curved abutment surface extends between the internal thread and the free end in the radial direction over a width ⁇ . a 0.75 * (D, - dj) / 2.
  • the contact surface is convexly curved.
  • the force is applied to a screwed
  • the recess has on a side facing away from the free end side of the internal thread on a further contact surface for supporting a further support surface of the cutting head.
  • the further support surface may in particular directly connect to the internal thread or it may also be provided an intermediate transition region.
  • the further contact surface may preferably also be curved, in particular also convexly curved.
  • the additional contact surface may have a larger radius of curvature than the previously described contact surface between the internal thread and the free end of the tool shank.
  • the further contact surface is rotationally symmetrical with respect to the longitudinal axis.
  • the further contact surface may also have the shape of a partial surface of a tire or donut, in particular the shape of a partial surface of a torus.
  • the rotating shaft tool includes: a replaceable cutting head, a working area and one integral with the work area
  • Connecting portion cooperates.
  • a support surface for supporting on a corresponding contact surface of the tool shank, which is arranged between the internal thread and a free end of the tool shank is formed.
  • the support surface and the corresponding contact surface are each formed curved in a section in a plane containing the longitudinal axis. Due to the curved formation of the
  • Support surface and the corresponding contact surface is a simultaneous radial and axial alignment and positioning of the
  • Cutting head allows, in particular concentrations of
  • Support surface and the corresponding contact surface preferably have the same curvature, so that a flat support between these two surfaces is guaranteed.
  • both the support surface and the contact surface are preferably formed rotationally symmetrical with respect to the longitudinal axis.
  • the cutting head can be designed such that it tapers continuously from the working area to the external thread.
  • the external thread of the cutting head and the cooperating internal thread of the tool shank can
  • Rejuvenate working area for example, in particular taper conically.
  • the threads can be formed in particular, for example, as a standard thread, for example as Metric rule thread, or even have different tooth shapes, eg as a trapezoidal thread, sawtooth thread, armored pipe thread, flat thread, round thread, Whitworth pipe thread, UNC, UNF, etc. be formed.
  • the external thread and the internal thread are each formed as a fine thread with low pitch and small thread depth.
  • the external thread and the internal thread are each formed as a fine thread with low pitch and small thread depth.
  • WO 2013/106875 A1 is described.
  • the support surface is concave and formed the contact surface is convexly curved. In this case, a particularly good positioning and centering of the cutting head
  • the support surface is curved in such a way that, in a section in a plane containing the longitudinal axis, it has a local radius of curvature r a 2: 1 mm at each point,
  • the radius of curvature can be constant over the entire support surface, as is the case with a design of the support surface as a partial surface of a torus, or it may for example also be provided a varying radius.
  • the corresponding contact surface preferably has a respective local radius.
  • Support surface and the abutment surface each having the shape of a partial surface of a tire or a donut, said tire or donut in a plane containing the longitudinal axis of the shank tool does not necessarily have to have an exactly circular or elliptical cross-section.
  • the support surface is blasted with a particle beam.
  • the curved support surface thus has the
  • Properties of a blasted with a particle beam surface are conditional.
  • the blasted support surface can in particular
  • the cutting head on one of the
  • Tool shank is supported on one of the free end of the
  • Tool shank facing away from the internal thread is formed in the recess.
  • a particularly stable alignment and positioning of the cutting head is possible.
  • the further contact surface can in particular also be curved in a plane which contains the longitudinal axis, in particular preferably convexly curved.
  • the other contact surface can in particular also be curved in a plane which contains the longitudinal axis, in particular preferably convexly curved.
  • the further contact surface may also have the shape of a partial surface of a tire or a donut.
  • Cutting head may be particularly preferably formed of hard metal or cermet.
  • the cutting head can already be provided with cutting edges, for example, or it can be formed as a blank in which the cutting edges still have to be formed by subsequent processing, such as grinding, for example.
  • the tool shank can in particular be formed of a tougher material, such as tool steel.
  • FIG. 1 shows a perspective view of a tool shank for a rotating cutting tool according to one embodiment
  • Fig. 2 a perspective view of a replaceable
  • Fig. 4 a Fig. 3 corresponding further illustration to explain the
  • Shape of support surfaces and corresponding contact surfaces is an enlarged sectional view of a part of
  • FIG. 6 an enlarged partial cut corresponding to FIG. 5
  • the rotary shaft tool 1 is formed as an end mill, which extends along a longitudinal axis L
  • extending tool shank 2 and a replaceable cutting head 3 has.
  • the rotating shank tool 1 is a drill.
  • the cutting head 3 is shown in each case as a blank, which is not yet provided with the cutting edges required for the machining, since it does not depend on the exact configuration of the cutting for the present invention. Unless hereinafter referred to a radial direction or an axial With reference to the direction, these terms always refer to the longitudinal axis L, unless something of the concrete context is concerned
  • the cutting head 3 has a working area 30 and an integrally formed with the working area 30 connecting portion 31.
  • Work area 30 can be used for machining a
  • the cutting head 3 is formed of a hard and wear-resistant material such as hard metal or cermet in particular.
  • the working area 30 has an im
  • Cutting head 3 in the illustrated embodiment also has an axial
  • Bore 32 which extends along the longitudinal axis L.
  • the bore 32 is open on the side of the connecting portion to the outside and is designed as a blind hole, which extends into the work area 30.
  • the bore 32 may be used to supply coolant and / or lubricant to the blades to be formed, e.g. by appropriate grinding, erosion or the like outlets for the cooling and / or
  • Lubricant can be formed on the outside of the working area 30. Although such a bore 32 is shown with respect to the embodiment, it is e.g. also possible to form the cutting head 3 without such a bore.
  • an optional engagement surface 33 for engagement with a screwing tool is further shown on the cutting head 3, which may be provided to facilitate screwing the cutting head 3. If desired, in particular two such engagement surfaces 33 on
  • the connecting portion 31 of the cutting head 3 is designed to connect the cutting head 3 to the tool shank 2, as will be described in more detail below.
  • the tool shank 2 has a first end 20 for connection to a
  • the tool shank 2 is preferably made of a tougher material than the cutting head 3, e.g. made of tool steel, molybdenum or a molybdenum alloy, tungsten or a tungsten alloy.
  • a tougher material e.g. made of tool steel, molybdenum or a molybdenum alloy, tungsten or a tungsten alloy.
  • the tool shank 2 in the illustrated embodiment is provided with a continuous longitudinal bore 22 which makes it possible
  • the longitudinal bore 22 extends in the illustrated
  • Embodiment concentric with the longitudinal axis L. Although each such longitudinal bore 22 is shown in the figures, it is e.g. also possible to form the tool shank 2 without such a longitudinal bore 2.
  • Tool shaft 2 serving areas of the cutting head 3 and the
  • Tool shank 2 described in more detail. Unless hereinafter referred to the cross-section of a component or a
  • Connecting portion 31 has a smaller cross section than in the
  • the connecting portion 31 of the cutting head 3 has an external thread 34, which in the illustrated embodiment as a cylindrical thread with substantially constant over its longitudinal extent
  • Diameter d a is formed. However, it should be noted that the
  • External thread 34 can taper in a modification, for example, with increasing distance from the working area 30, in particular conically taper.
  • the diameter d a denotes the largest diameter of the external thread 34 at its end facing the working area 30.
  • the external thread 34 is shown in the illustrated
  • Embodiment designed as a metric fine thread which has a lower thread pitch and a smaller tooth depth compared to a standard metric thread.
  • other thread forms are possible.
  • a support surface 35 for supporting on a corresponding contact surface of the tool shank 2, which will be described in more detail later,
  • the support surface 35 is with respect to the longitudinal axis L.
  • the support surface 35 is formed curved in a section in a plane containing the longitudinal axis L, over its entire extent. In the specific embodiment shown in the figures, the support surface 35 is formed in particular concavely curved.
  • the support surface 35 shown hatched in FIGS. 3 and 4 forms the region between the external thread 34 and the working region 30, which serves to axially and radially support the cutting head 3 on the tool shank 2. Between the support surface 35 and the external thread 34, as can be seen in FIGS. 3 and 4, e.g. still be provided a transitional section.
  • the support surface 35 has in a section in a plane which the
  • Longitudinal axis L contains, at each point a local radius of curvature r a , which is at least 1 mm, preferably at least 1, 5 mm.
  • Radius of curvature may vary in the direction from the external thread 34 to the working area 30 or, for example, also be formed constant, as shown schematically in Fig. 4.
  • the radius of curvature r a of the support surface 35th For example, constant, so that the support surface 35 extends along a partial surface of a torus, which allows a particularly precise and simple production.
  • the support surface 35 bridges the majority of the ring
  • the support surface 35 extends up to the outer edge of the working area 30 on the outer thread 34 side facing.
  • the support surface does not bridge the entire difference in diameter between the diameter d a of the external thread 34 and the diameter D a of the working region 30.
  • the annularly extending support surface 35 has at least one width A a in the radial direction, for which the following applies: A a ⁇ 0.75 * (D a -d a ) / 2. In other words, this means that the support surface bridges at least 75% of the radial distance between the working area 30 and the external thread 34.
  • the support surface 35 is further blasted in the embodiment with a particle beam so that it has the properties of a blasted surface.
  • the support surface 35 is formed such that it
  • the blast treatment in the preparation of the support surface 35 may preferably in one
  • Compressed jet method by dry blasting wherein as particles of the particle beam, e.g. Glass beads, zirconium oxide and / or corundum can be used.
  • the blast treatment may preferably take place such that the support surface 35 has compressive stresses in a region near the surface.
  • Compressive stresses can be controlled in a simple manner via the parameters of the jet treatment, in particular the jet pressure, the Material of the particles, the size of the particles, the angle of incidence, the shape of the particles, etc.
  • the support surface 35 is not ground or coated after blasting.
  • FIGS. 3 and 4 are identical to FIGS. 3 and 4, FIG. 3
  • Working area 30 facing away from the external thread 34 still another support surface 36 on.
  • the further support surface 36 also extends rotationally symmetrical about the longitudinal axis L.
  • the connecting portion 31 has a smaller diameter in the region of the further support surface 36 as in the region of
  • Diameter of the further support surface 36 thereby with increasing distance from the external thread 34.
  • the hatched in Figs. 3 and Fig. 4 shown further support surface 36 is adapted to engage another
  • the further support surface 36 is also concavely curved in a plane containing the longitudinal axis L.
  • the further support surface 36 has a radius of curvature R a , which is greater than the radius of curvature r a of the support surface 35 described above.
  • R a a constant radius of curvature R a of the further support surface 36 is shown, so that the other
  • Supporting surface 36 extends along a partial surface of a tome, the radius of curvature R a, for example, also vary in the axial direction.
  • the connecting portion 31 to the external thread 34 throughout the same radius of curvature R a , which allows a particularly simple and reliable production.
  • the tool shank 2 has at its free end 21 a recess 23 which extends from the free end 21 in the direction of the longitudinal axis L into the tool shank 2.
  • the recess 23 is (apart from the Teeth of the internal thread 24 described below) with respect to the longitudinal axis L formed substantially rotationally symmetrical.
  • Recess 23 is provided with an internal thread 24 to the
  • the internal thread 24 is also formed in the embodiment as a metric fine thread. According to an advantageous development, however, it may be provided that the internal thread 24 and the external thread 34 have a slightly different thread pitch, as described in the aforementioned prior art, in order to achieve an improved force distribution.
  • the contact surface 25 extends up to the free end 21 of the
  • Tool shank 2 As can be seen in FIGS. 3 and 4, in the embodiment between the abutment surface 25 and the internal thread 24 a transition surface is still formed.
  • the contact surface 25 extends rotationally symmetrically about the longitudinal axis L and is in a section in a
  • the contact surface 25 has in a section in a plane that the
  • the contact surface 25 is preferably in shape exactly to the shape of the support surface 35 of the
  • Cutting head 3 adapted to achieve a flat support.
  • the radius of curvature n of the contact surface 25 may be at least substantially equal to the radius of curvature r a of the support surface 35
  • Radius of curvature n vary in the axial direction.
  • the contact surface 25 has a constant radius of curvature n, so that it extends along a partial surface of a torus, as can be seen in particular in FIG. 4.
  • the abutment surface 25 is formed to cover substantially the entire difference between the diameter d,
  • Bearing surface 25 but at least one width ⁇ , in the radial direction, for which applies: ⁇ , 0.75 * (Drdi) / 2. In other words, this means that the
  • Bearing surface bridged at least 75% of the radial distance between the free end 21 and the internal thread 24.
  • a further contact surface 26 is formed in the recess 23 on the side remote from the free end 21 of the tool shank 2.
  • the further contact surface 26 is designed to support the further support surface 36 of the cutting head 3.
  • the further contact surface 26 is dimensioned such that it is in contact with the further support surface 36 of the cutting head 3 when the
  • Embodiment rotationally symmetrical with respect to the longitudinal axis L.
  • the further abutment surface 26 is also curved, in particular in a section in a plane containing the longitudinal axis L, formed convexly curved over its entire axial extent.
  • the further contact surface 26 has a constant radius of curvature Rj over its entire radial extension, so that the further Bearing surface 26 extends along a partial surface of a tome.
  • the radius of curvature R, the other bearing surface 26 in particular to the radius of curvature R a of the further support surface 36 of the cutting head adapted so that the radii of curvature at least substantially coincide.
  • the radius of curvature R, the other bearing surface 26 in particular to the radius of curvature R a of the further support surface 36 of the cutting head adapted so that the radii of curvature at least substantially coincide.
  • the radius of curvature R, the other bearing surface 26 in particular to the radius of curvature R a of the further support surface 36 of the cutting head adapted so that the radii of curvature at least substantially coincide.
  • Radius of curvature R varies in the axial direction.
  • Contact surface 26 is still a substantially cylindrical portion 27 of the recess 23, which is adapted to accommodate, inter alia, manufacturing tolerances.
  • a substantially step-like cross-sectional widening 28 is formed in the embodiment. Instead of such a stepped cross-sectional enlargement 28, e.g. also a continuous one
  • Cross-sectional enlargement with e.g. be provided a conical shape.
  • Bearing surface 26 and the internal thread 24 allows reliable production of the curved contour of the other contact surface 26th
  • Cutting head 3 so together with the internal thread 24 in the recess 23 that the support surface 35 of the cutting head 3 is pressed against the corresponding contact surface 25 of the tool shank 2, so that sets a substantially flat contact.
  • further intermediate surfaces e.g.
  • the power transmission takes place during machining with the rotating shank tool 1 in the area between the threaded connection and the working area 30 over the curved surfaces, which are pressed against each other, i. the support surface 35 and the
  • Corresponding contact surface 25 Corresponding contact surface 25. In this way, a good distribution of the forces is achieved, in particular concentrations of tensile stresses in the material of the cutting head 3 are reliably prevented.
  • an additional support which also contributes to an advantageous force distribution and relief of the threaded connection. Furthermore, an additional centering and alignment of the cutting head 3 is provided via the further support surface 36 and the further contact surface 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'invention concerne une tête de coupe remplaçable (3) présentant une zone de travail (30) et une partie de liaison (31) faisant corps avec la zone de travail (30) et comportant un filetage extérieur (34). La tête de coupe (3) présente un axe longitudinal (L). Une surface de support (35) est formée entre la zone de travail (30) et le filetage extérieur (34) en vue d'un support sur une surface de contact (25) correspondante d'une tige d'outil (2). La surface de support (35) est incurvée dans une section à l'intérieur d'un plan comprenant l'axe longitudinal (L).
EP16745402.4A 2015-08-05 2016-06-27 Tête de coupe remplaçable, tige d'outil et outil à tige Pending EP3331658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATGM234/2015U AT15013U1 (de) 2015-08-05 2015-08-05 Auswechselbarer Schneidkopf, Werkzeugschaft und Schaftwerkzeug
PCT/AT2016/000070 WO2017020051A1 (fr) 2015-08-05 2016-06-27 Tête de coupe remplaçable, tige d'outil et outil à tige

Publications (1)

Publication Number Publication Date
EP3331658A1 true EP3331658A1 (fr) 2018-06-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16745402.4A Pending EP3331658A1 (fr) 2015-08-05 2016-06-27 Tête de coupe remplaçable, tige d'outil et outil à tige

Country Status (3)

Country Link
EP (1) EP3331658A1 (fr)
AT (1) AT15013U1 (fr)
WO (1) WO2017020051A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15412U1 (de) * 2016-06-27 2017-08-15 Ceratizit Austria Gmbh Verfahren zur mechanischen Ausheilung funktionaler Hartmetall- oder Cermet-Oberflächen
DE102017127814A1 (de) * 2017-11-24 2019-05-29 Hartmetall-Werkzeugfabrik Paul Horn Gmbh Werkzeug zur spanenden Bearbeitung eines Werkstücks
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