EP3148739A1 - Procédé de séparation par rupture, dispositif permettant la mise en oeuvre dudit procédé et pièce - Google Patents

Procédé de séparation par rupture, dispositif permettant la mise en oeuvre dudit procédé et pièce

Info

Publication number
EP3148739A1
EP3148739A1 EP15726584.4A EP15726584A EP3148739A1 EP 3148739 A1 EP3148739 A1 EP 3148739A1 EP 15726584 A EP15726584 A EP 15726584A EP 3148739 A1 EP3148739 A1 EP 3148739A1
Authority
EP
European Patent Office
Prior art keywords
fracture separation
workpiece
weld
laser
depth
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.)
Withdrawn
Application number
EP15726584.4A
Other languages
German (de)
English (en)
Inventor
Wolfgang RÖMPP
Siegfried Gruhler
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.)
Mauser Werke Oberndorf Maschinenbau GmbH
Original Assignee
Mauser Werke Oberndorf Maschinenbau 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 Mauser Werke Oberndorf Maschinenbau GmbH filed Critical Mauser Werke Oberndorf Maschinenbau GmbH
Publication of EP3148739A1 publication Critical patent/EP3148739A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B23K26/382—Removing material by boring or cutting by boring
    • B23K26/389—Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/04—Connecting-rod bearings; Attachments thereof
    • F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing

Definitions

  • the invention relates to a fracture separation method for fracture separation of a work piece along a fracture separation plane, a workpiece which can be fracture-separated by such fracture separation method, and an apparatus for carrying out the method.
  • a method for fracture separation of workpieces in which at least one fracture separation notch is formed on the circumference of the workpiece before the actual fracture separation in the region of the fracture separation plane.
  • This is formed with a laser, wherein a plurality of notch portions are formed, which are arranged in line behind one another.
  • the notch portions are formed as elongated recesses which form a kind of perforation and can extend out of a continuous notch base.
  • So-called fiber lasers which can be operated with comparatively low energy of about 50 watts, have proven particularly suitable for carrying out the process.
  • the laser beam is directed onto the workpiece via a "nozzle" forming the actual output lens of the optics, the laser beam being coupled obliquely, this method having largely established itself in the case of fracture cutting of connecting rods, crankcases and the like, and has mechanical processing the fracture separation notches, for example by honing replaced.
  • the invention has for its object to further improve this approach. This object is achieved by a fracture separation method having the features of patent claim 1, a workpiece having the features of patent claim 7 and a device having the features of patent claim 9.
  • the fracture separation of a workpiece takes place along a fracture separation plane specified in the broadest sense, wherein notch sections are introduced in the region of the fracture separation plane by means of laser energy, similar to the prior art.
  • a "notch section” is understood as meaning an elongated recess in the workpiece which is closed on one or both sides.
  • the laser is controlled in such a way that a weld seam is formed in the peripheral region of the workpiece and the notch sections extend out of it
  • the notch portion could extend from a continuous notch base, although this notch base could be partially filled with melt, the formation of a weld with concomitant microstructural changes has so far been avoided.
  • the device according to the invention has a laser unit and a break separation unit, wherein the laser unit is designed in such a way that a weld seam and notch sections extending therefrom are formed in the region of the break separation plane.
  • So-called 3D laser scanners with which the laser beam can be controlled in the X, Y and Z directions by means of a deflecting mirror and, if appropriate, corresponding control of the laser optics in the X, Y and Z directions have proven particularly suitable for the formation of such a weld, so that these 3D Scanners even very complex workpiece geometries can be machined.
  • a particular further advantage consists in that such 3D scanners are offset from the workpiece, since an exact focusing on the workpiece is possible via the pivoting mirror. As a result, contamination of the laser optics during welding can be avoided.
  • the activation of the laser takes place such that the weld has a greater hardness than the Grundmatehal of the workpiece.
  • the weld can be made porous.
  • the depth of the weld is equal to or greater than the depth of the notch portions. Is the total depth (weld + notch sections) in the range between 0.4 to
  • the depth of the weld is more than 50%.
  • a particularly effective crack propagation is obtained when the weld is formed in a section transverse to the weld longitudinal axis in approximately V-shaped or concave rounded, with the notch portions extending from the bottom of the V-notch out.
  • FIG. 1 shows a highly schematized principle illustration of a method with which a weld seam is introduced into a workpiece to be fractured.
  • Figure 2 is a diagram for explaining a notch section mechanism and Figure 3 is a diagram from which the dependence of the breaking separation force from the depth of the notch portions is derivable.
  • a processing unit for fracture separation of workpieces has a breakage unit, not shown, through which the fracture separation of the workpiece takes place.
  • This workpiece can have a bearing recess, for example a large connecting rod eye, into which a cracking mandrel then dips for fracture separation.
  • the processing unit can also have stations for feeding and removing the workpieces, a screwing station, a socket press-in station, etc.
  • the indicated in Figure 1 laser unit 1 is designed as a 3D laser scanner. Such laser scanners are used with reduced power for marking workpieces. In the method according to the invention, the power is in the range of 50 W.
  • the laser itself is a fiber laser whose laser beam guided via light guide is directed over a pivoting mirror 2 and an only indicated exit window 4 on the workpiece to be machined.
  • the 3D scanner is designed so that the laser beam in the X, Y and Z direction is adjustable, so that the laser beam 6 can be focused exactly on the area to be machined of the workpiece 8. As shown, the output window 4 is formed at a distance from the workpiece 8, so that contamination by vapors occurring during processing is avoided.
  • the laser beam 6 is controlled in such a way that a weld seam 10 is formed on the outer periphery of a bolt-shaped workpiece or on the inner peripheral region of a bearing eye or the like, which extends perpendicular to the plane of the drawing in the illustration according to FIG.
  • this weld seam 10 is approximately V-shaped, with notch portions 14 extending out of a vertex 14 which are not or at least only partially filled with melt and thus are hollow.
  • FIG. 1 a For clarity, a section along the line A, B in Figure 1 is shown in Figure 1 a. Accordingly, one sees the oblique position of the notch portions 14 which is predetermined by the Einkoppelwinkel of the laser beam 6.
  • the exit window 4 of the laser unit 1 (3D scanner) is accordingly arranged relatively far away from the processing area, so that contamination of the exit window 4 by vapors is avoided.
  • the total depth S1 + S2 is about 0.4 to 0.6 mm.
  • the depth S1 of the weld seam 10 is at least 50, preferably slightly more than 50%, of the total depth, so that the depth of the notch sections can correspondingly be slightly less than the weld depth. Of course, deviations from these geometry specifications are possible.
  • the structure of the weld 10 has a greater Shore hardness than the base material of the workpiece. Furthermore, this weld structure is not homogeneous, but slightly porous. This is characterized in the illustration of Figure 1 a with a crack 16.
  • the notch portions 14 are formed by so-called “deep-welding effects", in which so-called keyholes are formed by the fiber laser operated according to the Q-switch method of the 3D laser scanner, which arise due to evaporation of the material due to the laser energy.
  • the fracture separation force is first introduced into the region of the comparatively hard weld seam. Due to the great hardness and porosity of this weld, a crack is formed there, which then continues into the material via the hollow notch sections 14, so that the workpiece breaks along the break parting plane with high precision and reproducibility.
  • the crack propagation is caused by the weld 10 and the notch portions 14 extending therefrom. Without these notch portions 14 significantly higher fracture separation forces must be applied to break the workpiece break. This is explained with reference to FIG.
  • the cracked connecting rod is screwed after the fracture separation and then optionally ground flat in another processing station frontally.
  • the large connecting rod is pre-drilled, wherein the pre-drilling is carried out such that the hard areas of the remaining parts of the weld after fracture separation are almost completely removed.
  • the material in the region of the notch sections is comparatively soft, so that these notch sections need not be removed or only partially removed.
  • the pre-drilling is a fine machining, in which, for example, about 150 ⁇ be removed.
  • fine boring in which the actual geometry of the connecting rod eye, for example an ovality or a trumpet shape, is formed by means of a radially adjustable fine boring head. This fine boring is then carried out in accordance with the relatively soft material, so that the service life of the fine boring tool is not affected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un procédé de séparation par rupture d'une pièce (8). Selon l'invention, un cordon de soudure (10) sur lequel s'étendent en saillie des parties d'entaille (14) est lissé dans la région d'un plan de séparation par rupture.
EP15726584.4A 2014-05-30 2015-05-29 Procédé de séparation par rupture, dispositif permettant la mise en oeuvre dudit procédé et pièce Withdrawn EP3148739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014107678 2014-05-30
PCT/EP2015/061949 WO2015181352A1 (fr) 2014-05-30 2015-05-29 Procédé de séparation par rupture, dispositif permettant la mise en oeuvre dudit procédé et pièce

Publications (1)

Publication Number Publication Date
EP3148739A1 true EP3148739A1 (fr) 2017-04-05

Family

ID=53276867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15726584.4A Withdrawn EP3148739A1 (fr) 2014-05-30 2015-05-29 Procédé de séparation par rupture, dispositif permettant la mise en oeuvre dudit procédé et pièce

Country Status (3)

Country Link
EP (1) EP3148739A1 (fr)
CN (1) CN106413973A (fr)
WO (1) WO2015181352A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2129240T5 (es) 1995-02-06 2007-06-16 Mauser-Werke Oberndorf Maschinenbau Gmbh Procedimiento para la separacion con ruptura de piezas de trabajo.
US7418886B2 (en) * 2002-12-26 2008-09-02 Yamaha Hatsudoki Kabushiki Kaisha Split type connecting rod
DE102004026297B4 (de) * 2004-01-21 2007-12-20 Daimlerchrysler Ag Geteiltes Lager
DE102011009029A1 (de) * 2011-01-20 2011-09-22 Daimler Ag Verfahren zum Bruchtrennen eines Bauteils

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2015181352A1 *

Also Published As

Publication number Publication date
WO2015181352A1 (fr) 2015-12-03
CN106413973A (zh) 2017-02-15

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