EP4017667A1 - Procédé et dispositif d'usinage d'une pièce par enlèvement de copeaux - Google Patents

Procédé et dispositif d'usinage d'une pièce par enlèvement de copeaux

Info

Publication number
EP4017667A1
EP4017667A1 EP20735173.5A EP20735173A EP4017667A1 EP 4017667 A1 EP4017667 A1 EP 4017667A1 EP 20735173 A EP20735173 A EP 20735173A EP 4017667 A1 EP4017667 A1 EP 4017667A1
Authority
EP
European Patent Office
Prior art keywords
drilling
workpiece
frequency
axial
machining
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
EP20735173.5A
Other languages
German (de)
English (en)
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
Broetje Automation GmbH
Original Assignee
Broetje Automation 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 Broetje Automation GmbH filed Critical Broetje Automation GmbH
Publication of EP4017667A1 publication Critical patent/EP4017667A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
    • B23B47/34—Arrangements for removing chips out of the holes made; Chip- breaking arrangements attached to the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/10—Bits for countersinking
    • B23B51/108—Bits for countersinking having a centering drill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/04—Aircraft components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23B2222/88—Titanium
    • 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

Definitions

  • the invention relates to a method for machining a workpiece according to the preamble of claim 1 and a device for machining a workpiece according to the preamble of claim 11.
  • the method in question for machining with drilling and subsequent countersinking is carried out with combined drilling and countersinking tools which have a tool section for drilling and a tool section with a countersink step.
  • the drilling / countersinking tool is subjected to an axial feed movement reaching up to a countersink end position.
  • the lowering end position corresponds to the axial position of the drilling / countersinking tool in which the lowering step engages the workpiece with the depth provided for the lowering.
  • the axial feed movement of the drilling-countersinking tool is superimposed with an axial vibration in order to break the chips produced by drilling the workpiece.
  • the amplitude of the axial vibration is reduced or canceled while the rotation of the drilling / countersinking tool is continued before the lowering end position is reached. By reducing or canceling the amplitude, the surface in the workpiece produced by the countersinking is smoothed.
  • the invention is based on the problem of specifying a method for the machining of a workpiece with drilling and subsequent countersinking, with which the dimensional accuracy of the bore and countersink obtained is further improved.
  • the above problem is solved in a method according to the preamble of claim 1 by the features of the characterizing part of claim 1.
  • the fundamental consideration is that by superimposing the axial feed movement with an axial vibration, in addition to the chip-breaking effect, it is also possible to suppress the undesired axial rattle of the drilling / countersinking tool. According to the proposal, it has been recognized that the axial vibration, when the frequency is reduced, leads in particular to erosion of the chatter marks and to increased dimensional accuracy.
  • the frequency of the axial vibration is lowered to a finishing frequency and the machining process is continued with the finishing frequency as the maximum frequency of the axial vibration until the lowering end position is reached .
  • the further configurations according to claims 7 to 10 relate to the more detailed configuration of the workpiece.
  • delamination of the layers is largely avoided using the proposed method.
  • the proposed method is also particularly advantageous in the case of workpieces comprising plastic materials according to an embodiment according to claim 10, in particular in the case of countersink machining in plastic materials, since the tendency for the plastic material to tear and splinter can be reduced.
  • a further optimization of the processing time and the result of the proposed method results from the fact that in the drilling process, the feed rate of the axial feed movement is set as a function of the axial position of the drilling / countersinking tool.
  • a device for machining a workpiece the device being set up for carrying out the proposed method, is claimed as such.
  • the device has a rotary drive for the axial rotation of the drilling / countersinking tool and a feed drive for providing the axial feed movement of the drill / countersinking tool relative to the workpiece and a control arrangement for controlling the feed drive.
  • the proposed method can be carried out on the basis of program instructions stored in a memory of the control arrangement of the device.
  • FIG. 1 shows a schematic representation of the drilling / countersinking tool and the workpiece a) in a first section of the drilling process, b) in a second section of the drilling process and c) in a countersinking process according to the proposed method
  • FIG. 2 shows an illustration of the axial feed movement from FIG. 1 with superimposition of the axial vibration according to the proposed method
  • FIG. 3 shows a schematic representation of the engagement of the drilling / countersinking tool in the material of the workpiece a) with an axial rattle and b) with the axial feed movement with superimposition of the axial vibration, and
  • FIG 4 shows an apparatus according to the proposal for carrying out the method according to the proposal.
  • the invention relates to a method for machining a workpiece 1, with drilling machining of workpiece 1 and subsequent countersinking of the hole obtained with drilling in workpiece 1 in a machining process by means of a drilling / countersinking tool 2.
  • a workpiece 1 is understood to mean an element to be machined within the framework of the machining process and in particular a component or semi-finished product to be machined.
  • a cylindrical bore is preferably produced in the workpiece 1 during drilling.
  • the drilling operation is followed by the countersinking operation to produce a countersink on the bore, the countersinking being introduced as a profiled, preferably conical, widening of the bore on at least one of the surfaces of the workpiece 1.
  • the drilling / countersinking tool 2 has a tool section 3 for drilling and a tool section 4 for countersinking the workpiece 1.
  • the tool section 3 for drilling is here and preferably designed as an approximately cylindrical twist drill.
  • the tool section 4 for machining the countersink is profiled and here and preferably is designed as a countersink step with a conical drilling section.
  • the tool section 4 for countersinking is also designed as a twist drill, the helical cutting edge of the drilling and countersinking tool 2 continuing from the tool section 3 into the tool section 4.
  • the drilling / countersinking tool 2 is set in axial rotation in the machining process.
  • axial and radial are correspondingly related to the axis of rotation R of the drilling / countersinking tool 2, which here is identical to the axis around which the helical cutting edge of the drill / countersink tool 2 runs.
  • the drilling / countersinking tool 2 is subjected to an axial feed movement and moved along the axis of rotation R in the direction of the workpiece 1.
  • a hole designed as a through hole is here and preferably generated in workpiece 1.
  • the countersinking is carried out, here and preferably in a single axial feed movement and without moving the drilling / countersinking tool 2 out of the workpiece 1 between and during the drilling and countersinking.
  • the tool section 4 with the countersink step engages the workpiece 1 during countersinking.
  • the axial feed movement is continued up to a lowering end position SE, at which the axial feed movement is ended.
  • the drilling / countersinking tool 2 is no longer moved axially in the direction of the workpiece 1 after it has reached the lowering end position SE. After the lowering end position SE has been reached, the drilling / countersinking tool 2 can rather be pulled out of the bore and countersink generated in the workpiece 1.
  • the drilling / countersinking tool 2 is withdrawn immediately after the lowering end position has been reached.
  • the drilling / countersinking tool 2 is withdrawn after holding the drilling / countersinking tool 2 for a predetermined holding time at the lowering end position SE.
  • the countersink obtained with the machining process is, here and preferably like the bore, approximately rotationally symmetrical about the axis of rotation R of the drilling / countersinking tool 2.
  • the lowering end position SE corresponds to the axial position of the drilling / countersinking tool 2, in which the tool section 4 engages the workpiece 1 with the depth provided for the lowering for machining.
  • the lowering end position SE is preferably specified on the basis of the geometry of the element provided for insertion into the bore, for example on the basis of the geometry of a rivet head of a rivet. For example, it is provided that the element provided for insertion ends flush with the surface of the workpiece 1 or is sunk to a predetermined depth below the surface or protrudes from the surface at a predetermined height.
  • the axial feed movement is superimposed with an axial vibration during the machining process, preferably during the entire machining process.
  • the drilling / countersinking tool 2 thus undergoes a movement in the axial feed direction, which is composed of an aperiodic, preferably at least partially constant, axial feed rate V and a periodic, axial movement from the axial vibration.
  • the axial vibration is preferably approximately sinusoidal, although other periodic configurations of the axial vibration are also conceivable.
  • the axial feed movement is superimposed with an axial vibration having a frequency f which is reduced by a frequency f compared to the frequency f used before the lowering.
  • the frequency f from the predetermined frequency lowering position S F to the lowering end position SE can be varied, but is at most the finishing frequency f C.
  • the frequency f from the predetermined frequency lowering position S F to the lowering end position SE is left constant and equal to the finishing frequency f C.
  • Fig. 2 shows the axial feed movement of the drilling / countersinking tool 2 with the superimposition of the axial vibration.
  • the axial position S of the drilling / countersinking tool 2 is shown here together with the aperiodic axial feed rate V and the frequency f of the axial vibration over time t.
  • the drilling / countersinking tool 2 is initially moved towards the workpiece 1 in the axial direction before the start of the machining process. From the point in time t1, when the machining start position SA is reached, from which the drilling / countersinking tool 2 engages the workpiece 1, the machining process and the drilling machining shown in FIG. 1a) begin.
  • the drilling process here has two drilling processing sections A and B, which will be explained in more detail below. In the drilling processing sections A and B, different aperiodic axial feed rates VA, VB and different frequencies f A , f B are used, with the drilling processing section A ending and the drilling processing section B beginning at time t2 and position SB.
  • the frequency f of the axial vibration is lowered to the finishing frequency f C.
  • the frequency f is lowered from the frequency f B used in the previous drilling machining section B to the finishing frequency f C.
  • the machining process is continued with the finishing frequency f C as the maximum frequency f of the axial vibration until the lowering end position SE is reached at time t4.
  • the frequency f with reaching the predetermined frequency quenzabsenkposition S f until reaching the lowering end position SE is constant and equal to the Endbearbeitungsfrequenz f C.
  • At least part of the countersink machining, and in any case the generation of the surface of the countersink is thus carried out with a frequency f that is lower than that of the previous machining.
  • the drilling / countersinking tool 2 When the lowering end position SE is reached, the drilling / countersinking tool 2 is operated for a specified holding time up to time ts without any axial feed movements. held. The drilling / countersinking tool 2 is then moved out of the workpiece 1.
  • Fig. 3 shows schematically the engagement of the drilling and countersinking tool 2 in the material of the workpiece 1.
  • Fig. 3a the effect of an axial rattle is shown.
  • the torque applied to the cutting edges of the drilling and countersinking tool 2 during an engagement causes an axial expansion of the drilling and countersinking tool 2, since the torque tends to "unwind" the spiral shape of the cutting edges.
  • the rigidity of the drilling and countersinking tool 2 counteracts this effect.
  • Fig. 3b shows the machining during the axial feed movement with superimposition of the axial vibration with reduced frequency f.
  • the chatter marks are removed with the rotation of the drilling-countersinking tool 2 due to the axial vibration with a comparatively low frequency that is forced in the feed movement.
  • the amplitude of the axial vibration is left the same or increased.
  • the machining process will be the same or increased amplitude until reaching the lowering end position S E continued. This further improves the removal of the chatter marks.
  • the frequency lowering position S F is defined such that the frequency lowering position S F is reached before the start of the lowering machining.
  • the frequency lowering position S F can also be reached during the countersink machining, so that at least for the start of the countersink machining there is an axial vibration with a high frequency f for effective chip breaking.
  • the frequency lowering position S F is defined in such a way that the frequency lowering position S F is reached after the end of the drilling operation.
  • a comparatively high frequency f of vibration is used for effective chip breaking until the end of the drilling operation.
  • the frequency lowering position S F is defined in such a way that the frequency lowering position is reached after the end of the drilling operation and before the start of the lowering operation. If a through hole is made in the workpiece 1 with the drilling, the drilling can be completed before the start of the countersinking process in that the tool section 6 for drilling already exits the workpiece 1 before the tool section 8 for countersinking engages with the workpiece 1 comes.
  • finishing frequencies f C For the completion of the countersinking machining, smaller finishing frequencies f C have proven to be advantageous compared to the frequencies f A , f B that are usually used in drilling operations with axial vibrations.
  • the finishing frequency f C is therefore smaller than all the frequencies f A , fe of the axial vibration used in the machining process before the predetermined frequency lowering position S F is reached.
  • the finishing fre- frequency f C at most 70%, more preferably at most 30%, in particular at most 10%, of the smallest frequency f A , f B of the axial vibration used in the machining process before reaching the specified frequency lowering position S F.
  • the finishing frequency f C is less than the basic frequency of the axial rattle of the drilling / countersinking tool. Accordingly, the axial rattle can be counteracted with the axial vibration.
  • radial oscillations of the drilling / countersinking tool 2 can also occur, which lead to the deviation of the bore and countersink from an ideal rotationally symmetrical shape.
  • the finishing frequency f C can be predetermined on the basis of the fundamental frequency of the radial oscillation of the drilling / countersinking tool 2, the finishing frequency f C being smaller than the basic frequency of the radial oscillation.
  • a further advantageous embodiment of the proposed method is given in that an aircraft structural component is machined as workpiece 1.
  • An aircraft structural component is, for example, fuselage parts, wing parts or tail unit parts of an aircraft, which are designed in particular as lightweight components.
  • a riveting of the aircraft structural component is preferably provided, the machining process for introducing a rivet into the aircraft structural component being carried out.
  • the proposed method is used to rivet the workpiece after the machining process by means of the bore and countersink generated in the machining process.
  • the machining process is carried out on a layer composite material of the workpiece 1.
  • the axial feed movement can run approximately perpendicular to the planes of the layers of the layered composite material and several layers can be machined with the machining process.
  • Preferred layer composite materials have layers made of titanium materials and plastic materials.
  • the machining process can generally be carried out on a titanium material of the workpiece, part of the workpiece or the entire workpiece being made from a titanium material.
  • a titanium material is understood here to mean titanium and alloys with the main alloy element titanium and titanium composite materials.
  • machining process preferably the countersink machining
  • a plastic material of the workpiece tearing and splitting of the plastic material can be effectively avoided using the proposed method.
  • a part of the workpiece or the entire workpiece can be made of a plastic material.
  • plastic materials are fiber-reinforced plastics and in particular carbon fiber-reinforced plastics.
  • the workpiece 1 accordingly shows a workpiece 1 which is formed by a layer composite material.
  • the workpiece has a first layer 5 made of carbon fiber reinforced plastic and a second layer 6 made of titanium.
  • the drilling operation is carried out through the first layer 10 and the second layer 12, while the countersinking operation produces a countersink in the first layer 10 made of carbon fiber reinforced plastic.
  • the feed speed V of the axial feed movement is set depending on the axial position of the drilling / countersinking tool 2 in the drilling process, the feed speed V preferably being set depending on the material of the workpiece 1 processed with the drilling process.
  • the drilling process has two drilling processing sections A and B, the bore being made in the first layer 10 in drilling processing section A and the bore being made in the second layer 12 in drilling processing section B.
  • different aperiodic axial feed rates VA.VB are provided, the first layer 10 made of carbon fiber reinforced plastic being machined at a higher axial feed rate VA.
  • the axial feed rate Vc is again set for the countersinking operation, here and preferably to a higher axial feed rate Vc than in the previous drilling operation.
  • a device for machining a workpiece is claimed as such. 4 shows an embodiment of the device which is set up to carry out a machining process by means of a drilling / countersinking tool 2 with drilling machining of workpiece 1 and subsequent countersinking machining of the bore in workpiece 1 obtained with drilling machining.
  • the device has a rotary drive 7 for the axial rotation of the drilling / countersinking tool 2.
  • a rotatably mounted tool spindle 8 is provided, which receives the drilling / countersinking tool 2 and is driven by a rotary motor 9.
  • the tool spindle 8 and the drilling / countersinking tool 2 rotate together around the axis of rotation R when the rotary drive 7 is actuated.
  • the device has a feed drive 10 to provide the axial feed movement of the drill / countersink tool 2 relative to the workpiece 1.
  • the feed drive 10 has a feed motor 11 and is set up to move the rotary drive 7 with the tool spindle 8 and the drilling / countersinking tool 2 together in the axial direction.
  • the device has a control arrangement 12 for controlling the feed drive 10.
  • the control arrangement is also set up to control the rotary drive 7.
  • the control arrangement can be set up to provide the axial feed movement and the superposition with an axial vibration.
  • the axial vibration is also carried out via a control of the feed drive 10 by means of the control arrangement 12.
  • the control arrangement 12 has a memory 13 with program instructions and at least one processor 14 for executing the program instructions.
  • program instructions are stored in the memory 13 which allow the proposed method to be carried out.
  • the memory 13 and the program instructions are set up, together with the processor 14, to cause the control arrangement 12 to control the feed drive 10 for carrying out the proposed method by means of the proposed device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)

Abstract

L'invention concerne un procédé d'usinage d'une pièce (1) par enlèvement de copeaux, selon lequel au cours d'un processus d'usinage, un perçage de la pièce (1), puis un lamage de l'alésage obtenu dans la pièce (1) par perçage sont effectués au moyen d'un outil de perçage et de lamage (2) ; au cours du processus d'usinage, l'outil de perçage et de lamage (2) étant soumis, en rotation axiale, à un mouvement d'avancement axial relativement à la pièce (1) parvenant jusqu'à une position terminale de lamage (SE), et le mouvement d'avancement axial étant superposé à une vibration axiale. Selon l'invention, lorsque l'outil de perçage et de lamage a atteint une position de réduction de fréquence (SF) prédéfinie du mouvement d'avancement axial, la fréquence (f) de la vibration axiale est abaissée à une fréquence d'usinage final (fc) et le processus d'usinage se poursuit à la fréquence d'usinage final (fc) comme fréquence maximale (f) de la vibration axiale, jusqu'à ce que la position terminale de lamage (SE) soit atteinte.
EP20735173.5A 2019-08-21 2020-06-29 Procédé et dispositif d'usinage d'une pièce par enlèvement de copeaux Pending EP4017667A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019122505.1A DE102019122505A1 (de) 2019-08-21 2019-08-21 Verfahren zur spanabhebenden Bearbeitung eines Werkstücks
PCT/EP2020/068225 WO2021032344A1 (fr) 2019-08-21 2020-06-29 Procédé et dispositif d'usinage d'une pièce par enlèvement de copeaux

Publications (1)

Publication Number Publication Date
EP4017667A1 true EP4017667A1 (fr) 2022-06-29

Family

ID=71266684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20735173.5A Pending EP4017667A1 (fr) 2019-08-21 2020-06-29 Procédé et dispositif d'usinage d'une pièce par enlèvement de copeaux

Country Status (5)

Country Link
US (1) US20220355391A1 (fr)
EP (1) EP4017667A1 (fr)
CN (1) CN114401807B (fr)
DE (1) DE102019122505A1 (fr)
WO (1) WO2021032344A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019147536A1 (fr) * 2018-01-23 2019-08-01 Quantum Impact, LLC Procédé et appareil d'usinage d'une pièce
CN118162921B (zh) * 2024-05-16 2024-07-16 泰兴市鹏生锻造有限公司 一种用于铝合金加工的自动打孔机

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5342152A (en) * 1990-10-11 1994-08-30 Medeksza Ludwik A Method and apparatus for forming intermittent chips while machining holes with a rotating tool
US6007281A (en) * 1998-04-09 1999-12-28 Novator Ab Method of producing holes in fiber reinforced composites using a tool with a cutting head having an enlarged diameter and reduced height
DE10335020A1 (de) * 2003-07-24 2005-03-24 Topf, Ernst, Ing. Spindelpulsator
ITRM20050238A1 (it) * 2005-05-13 2006-11-14 Natalino Capone Tecnologia di foratura innovativa
DE202005008630U1 (de) * 2005-05-31 2005-09-22 botek Präzisions-Bohrtechnik GmbH Bohrvorrichtung
CN1903489A (zh) * 2006-06-12 2007-01-31 江苏大学 步进式轴向振动钻削工艺及其设备
DE102007053350B4 (de) * 2007-10-30 2013-10-10 Chiron-Werke Gmbh & Co Kg Verfahren zur spanabhebenden Bearbeitung von Werkstücken
CN101758275A (zh) * 2008-12-23 2010-06-30 鸿富锦精密工业（深圳）有限公司 旋转刀具及复合加工方法
FR2944722B1 (fr) * 2009-04-28 2014-10-10 Arts Tete de percage a vibrations axiales
JP5802893B2 (ja) * 2011-05-18 2015-11-04 Uht株式会社 ドリル及びそれを用いた穿孔装置
FR2984192B1 (fr) * 2011-12-16 2014-01-10 Mitis Procede d'usinage
DE102012108378A1 (de) * 2012-09-07 2014-03-13 Indubrand Ag Verfahren zum Herstellen einer hochpräzisen Bohrung
DE102013006506A1 (de) * 2013-04-16 2014-10-16 Brötje-Automation GmbH Bearbeitungsanlage für Flugzeugstrukturbauteile
DE102013218446A1 (de) * 2013-09-13 2015-03-19 Cemecon Ag Werkzeug sowie Verfahren zum Zerspanen von faserverstärktenMaterialien
US10583538B2 (en) * 2015-11-16 2020-03-10 Apex Brands, Inc. Feed oscillation via variable pitch gears
DE102017101675A1 (de) * 2017-01-27 2018-08-02 Achim Lübbering Bohrmaschine und Verwendung einer Bohrmaschine

Also Published As

Publication number Publication date
CN114401807B (zh) 2024-06-18
WO2021032344A1 (fr) 2021-02-25
DE102019122505A1 (de) 2021-02-25
US20220355391A1 (en) 2022-11-10
CN114401807A (zh) 2022-04-26

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