EP4499335A1 - Outil de coupe pour l'usinage de plastiques - Google Patents

Outil de coupe pour l'usinage de plastiques

Info

Publication number
EP4499335A1
EP4499335A1 EP23715772.2A EP23715772A EP4499335A1 EP 4499335 A1 EP4499335 A1 EP 4499335A1 EP 23715772 A EP23715772 A EP 23715772A EP 4499335 A1 EP4499335 A1 EP 4499335A1
Authority
EP
European Patent Office
Prior art keywords
cutting
hollow cylinder
tool
coolant outlet
cutting tool
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
EP23715772.2A
Other languages
German (de)
English (en)
Inventor
Thomas Bischoff
Felix Rebholz
Zarko STEVANOVIC
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.)
Guehring KG
Original Assignee
Guehring 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 Guehring KG filed Critical Guehring KG
Publication of EP4499335A1 publication Critical patent/EP4499335A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/042—Drills for trepanning with lubricating or cooling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0466—Drills for trepanning with exchangeable cutting inserts, e.g. able to be clamped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/27—Composites
    • B23B2226/275—Carbon fibre reinforced carbon composites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/61—Plastics not otherwise provided for, e.g. nylon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/56—Guiding pads

Definitions

  • the invention relates to a cutting tool for processing plastic according to the independent claim.
  • the invention lies in the technical field of tools for metal-cutting manufacturing processes, in particular drills for producing holes in plastic, such as carbon fiber-reinforced plastic.
  • a problem when processing plastics with such crown-like drills is that separated material residues remain in the hollow cylinder, which must be removed before the drill is repositioned. To do this, it is usually necessary to stop the drill, which is particularly disadvantageous in industrial manufacturing processes.
  • the invention has the object of providing a cutting tool which overcomes the disadvantages of the prior art and enables easy removal of material residues generated during drilling, for example when processing plastic.
  • the invention comprises a cutting tool for machining plastic, comprising a tool shank for arrangement in a tool holder and a hollow cylinder adjoining the tool shank.
  • the hollow cylinder comprises at least one opening arranged on the front side for receiving a cutting element and at least one coolant outlet on the inside of the hollow cylinder.
  • the internal coolant outlet allows material residues generated during drilling to be flushed out. In this way one can Axial force for removing material residues can be generated on the internal material residue while the cutting tool is rotating.
  • the escaping cooling medium advantageously creates an overpressure in the chamber of the crown drill. This pressurized cooling medium causes the material plug to be automatically ejected when the last fiber layer is severed in fiber-reinforced plastics, which would otherwise remain within the hollow cylinder in the tool or even jam.
  • the hollow cylinder comprises at least one external coolant outlet and alternatively or additionally at least one front coolant outlet.
  • the outside coolant outlet allows the coolant to be dispensed to get between the outer wall of the hollow cylinder and the component to be processed. This reduces heating and fraying of the component, especially when processing fiber-reinforced plastics.
  • the front coolant outlet is advantageously formed on the front edge section of the hollow cylinder. For example, a portion of the opening for the cutting element can serve as a front coolant outlet.
  • the at least one outside coolant outlet comprises an opening arranged in the (outside) lateral surface of the hollow cylinder. This allows the coolant to be evenly distributed over the outer surface of the hollow cylinder.
  • the at least one inside coolant outlet comprises an opening arranged in the bottom surface of the hollow cylinder.
  • the coolant can be pressured out of this opening in the direction of any remaining material.
  • the at least one inside coolant outlet, the at least one outside coolant outlet and the at least one front coolant outlet are connected via a common feed channel in the tool shank.
  • the cooling medium is introduced through the shaft of the tool.
  • a cutting element with a cutting surface is arranged in the at least one opening arranged on the front side.
  • three or more cutting elements are provided.
  • the cutting surfaces are arranged at an angle a to the radial connection between a hollow cylinder center axis and the cutting element center axis.
  • the cutting edges not only have a positive rake angle, but are also turned inwards by angle a. This results in an overlap between the rake angle (drill) and the radial side rake angle (mill). This combination creates an inward and upward cutting force in the drilling tool, which prevents delamination.
  • the cutting element has a wedge step with an increased rake angle compared to the cutting surface.
  • the wedge step is part of the cutting edge, but has a second, significantly larger rake angle. It is used to cleanly separate protruding fibers that were not cut through when the cutting tips broke through.
  • the hollow cylinder particularly preferably comprises (on the outside) a guide bar.
  • Three or more guide strips are particularly advantageous for guiding the tool through the workpiece.
  • FIG. 1 shows a perspective view of a cutting tool according to the invention for processing plastic with an enlarged detailed view of the cutting element
  • FIG. 2 is a perspective view of the courses of the internal cooling channels
  • Fig. 3 is a top view from the front of the illustration from Fig. 2;
  • Fig. 4 is a top view from the front of the cutting tool from Fig. 1 with a bushing
  • FIG. 5 perspective view of the socket from Fig. 4.
  • FIG. 1 shows an exemplary embodiment according to the invention for a cutting tool 1 for processing plastic in a perspective view. In the lower area an enlarged detailed view of the attached cutting element 5 is shown.
  • the cutting tool 1 includes a tool shank 2 for arrangement in a tool holder (drill chuck). At the front, after a transition section, a drill bit with a hollow cylinder 3 adjoins the tool shank 2.
  • the section in the form of the hollow cylinder 3 has three openings 4 on the front end (side facing away from the tool shaft) for receiving the shaft of a cutting element 5.
  • the three inside coolant outlets 6a include openings located in the bottom surface 31 of the hollow cylinder 3 (only two can be seen in this perspective angle).
  • the inside coolant outlet 6a allows material residues generated during drilling to be flushed out by applying an axial force to remove material residues from the coolant while the cutting tool 1 is rotating.
  • the hollow cylinder 3 further comprises three external coolant outlets 6c and three front coolant outlets 6b. All three External coolant outlets 6c have an opening arranged along the lateral surface of the hollow cylinder 3.
  • a cutting element 5 with a cutting surface 51 pointing forward in the direction of rotation is arranged in the at least one opening 4 arranged on the front side.
  • the cutting element 5 has a wedge step 52 with an increased rake angle compared to the cutting surface 51. It is used to cleanly separate protruding fibers that were not cut through when the cutting tips broke through.
  • the hollow cylinder 3 has six rectangular guide strips 7.
  • the guide strips 7 guide the tool within the hole.
  • the guide bar diameter is smaller or equal to the diameter of the cutting elements 5.
  • the guide bars 7 can then be positioned in the axial position directly behind the outer tip of the cutting elements 5.
  • Fig. 2 shows a detailed representation of the cooling system with the corresponding channels and branches.
  • the inside coolant outlet 6a allows material residues generated within the hollow cylinder 3 to be flushed out during drilling.
  • the hollow cylinder 3, shown transparently, includes three external coolant outlets 6c and three front coolant outlets 6b.
  • the three inside coolant outlets 6a, the three outside coolant outlets 6c and the three front coolant outlets 6b are connected via a common feed channel 21 in the tool shank 2, which is shown transparently.
  • FIG. 4 the cutting tool 1 according to the exemplary embodiment from Fig. 1 is shown in a top view from the front, with the hollow cylinder 3 being surrounded by a bushing 8. If the use of a hundredweight drill is not possible for certain reasons (tool diameter too small, etc.), the tool can also be guided against an outer bushing 8.
  • the guide strips 7 serve to strike and guide the hollow cylinder 3 against the inside of the bushing 8.
  • the guide bar diameter is larger than the diameter of the cutting elements 5.
  • the guide bars 7 must be set back in the axial position relative to the cutting elements 5 to such an extent that the guide bars 7 have no contact with the workpiece when the through hole is created.
  • the cutting elements 5 not only have a positive rake angle, but are also turned inwards by an angle a (for the radial connection between a hollow cylinder central axis 13 and the cutting element central axis 12). This results in an overlap between the rake angle (drill) and the radial side rake angle (mill). This combination creates an inward and upward cutting force in the drilling tool, which prevents delamination.
  • Fig. 5 the socket 8 is shown alone without tools.
  • the side opening 81 serves to supply a fluid or to receive a fastener (not shown).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Drilling Tools (AREA)

Abstract

Un outil de coupe (1) pour l'usinage de matières plastiques comprend une tige d'outil (2) destinée à être disposée dans un porte-outil, et un cylindre creux (3) contigu à la tige d'outil (2) et comprenant au moins une ouverture avant (4) destinée à recevoir un élément de coupe, et en outre au moins une sortie de liquide de refroidissement interne (6a) sur le cylindre creux (3).
EP23715772.2A 2022-03-31 2023-03-24 Outil de coupe pour l'usinage de plastiques Pending EP4499335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022107663.6A DE102022107663A1 (de) 2022-03-31 2022-03-31 Zerspanungswerkzeug zum Bearbeiten von Kunststoff
PCT/EP2023/057597 WO2023186720A1 (fr) 2022-03-31 2023-03-24 Outil de coupe pour l'usinage de plastiques

Publications (1)

Publication Number Publication Date
EP4499335A1 true EP4499335A1 (fr) 2025-02-05

Family

ID=85979537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23715772.2A Pending EP4499335A1 (fr) 2022-03-31 2023-03-24 Outil de coupe pour l'usinage de plastiques

Country Status (3)

Country Link
EP (1) EP4499335A1 (fr)
DE (1) DE102022107663A1 (fr)
WO (1) WO2023186720A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104798A (en) 1963-11-22 1968-02-28 English Electric Co Ltd Trepanning tools
JPS57131210U (fr) * 1981-02-09 1982-08-16
JPS5964691A (ja) * 1982-10-05 1984-04-12 Nippon Kokan Kk <Nkk> コ−クス炉炉頂煉瓦の穿孔方法
US4500234A (en) 1982-11-12 1985-02-19 Waukesha Cutting Tools, Inc. Trepanning tool
GB9401715D0 (en) 1994-01-29 1994-03-23 Harthill Developments Ltd Improvements relating to pipe cutter heads
CN1100027A (zh) * 1994-07-07 1995-03-15 陈正枢 一次性成型圆筒花岗岩制品旋割机
DE202010003288U1 (de) * 2010-03-05 2010-08-05 Botek Präzisionsbohrtechnik Gmbh Führungsleiste

Also Published As

Publication number Publication date
WO2023186720A1 (fr) 2023-10-05
DE102022107663A1 (de) 2023-10-05

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