EP3200945A1 - Procédé de séparation de pièces par rupture et ébauche de pièces - Google Patents

Procédé de séparation de pièces par rupture et ébauche de pièces

Info

Publication number
EP3200945A1
EP3200945A1 EP15770938.7A EP15770938A EP3200945A1 EP 3200945 A1 EP3200945 A1 EP 3200945A1 EP 15770938 A EP15770938 A EP 15770938A EP 3200945 A1 EP3200945 A1 EP 3200945A1
Authority
EP
European Patent Office
Prior art keywords
fracture separation
notches
bearing eye
bearing
fracture
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Withdrawn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
EP15770938.7A
Other languages
German (de)
English (en)
Inventor
Siegfried Gruhler
Matthias Drinkmann
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 EP3200945A1 publication Critical patent/EP3200945A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
    • B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
    • B23D31/003—Breaking machines, i.e. pre-cutting and subsequent breaking for rings
    • 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

Definitions

  • the invention relates to a method for fracture separation of workpieces according to the preamble of patent claim 1 and a workpiece blank.
  • EP 0 808 228 B2 of the Applicant describes a generic fracture separation method in which a notch which predetermines the fracture separation plane is formed in a bearing eye to be fractured, for example a connecting rod by means of laser energy.
  • This notch consists of a plurality of notch portions, the distance of which results essentially from the frequency of the laser and the feed rate of the laser beam with respect to the connecting rod. It has been shown that the notch impact number can be increased considerably compared to through notches by these notch sections, so that a notch and an optimized fracture separation surface with comparatively low laser power can be formed. Due to the low laser power and the associated low introduced heat energy into the workpiece an undesirable, deep structural change in the notch area is avoided, with certain edge zones of the notch undergo a structural transformation and thus improve the fracture separation behavior.
  • the laser beam After emerging from the said active fiber, the laser beam is introduced into a glass fiber, via which the radiation is then guided to the actual laser head and is directed by way of focusing optics onto the workpiece to be machined.
  • Such fiber lasers are characterized by a very good electrical-optical efficiency and an outstanding beam quality in a very compact structure, so that less costly solutions can be created with a small space than with conventional lasers.
  • the fracture separation notches extend not only axially parallel along the peripheral surface of the bearing eye, but are also formed circumferentially along the diametrically opposite bearing eye webs.
  • the invention has for its object to provide a method for fracture separation of workpieces as well as an insertable in such a process ble workpiece blank, in which the risk of secondary cracking during fracture separation is minimized.
  • the fracture-splitting workpiece may be, for example, a connecting rod of a combustion engine, in which a bearing cap is separated from a connecting rod-side part.
  • the method can also be used, for example, in crankcase or camshaft housings in which a bearing cap is separated from a bearing block. It is also conceivable to use bushings, for example plain bearing rings, which are to be cracked on at least one side.
  • the method it is provided to form two or more fracture separation notches in the bearing eye webs of the workpiece for crack initiation, which approximately follow a course of a fracture separation plane through the diametrically opposite bearing webs pretend.
  • an expanding mandrel is inserted into the bearing eye and a breaking separation force is applied so that the bearing eye is separated along the fracture separation plane predetermined approximately by the fracture separation notches.
  • the fracture separation notches are not approximately parallel to the axis of the actual bearing surface, that is, formed on the inner peripheral surface of the bearing eye, but - preferably on one side - at end surface areas of the bearing eye. That is, the longitudinal axes of these fracture separation notches are perpendicular to the bearing axis.
  • Face areas of the bearing eye are designed so that they do not open in the storage area.
  • the fracture separation behavior can be further improved if in the bearing eye webs each Rissleitbohronneitbohronne lying approximately in the course of the fracture separation plane are formed, the bore axes parallel to the bearing axis and perpendicular to ybohrept.
  • the fracture separation notches are formed only in the region extending in the region between a crack guide bore adjacent to the bearing surface and the bearing surface, the fracture separation notch terminating at a distance therefrom.
  • the crack initiation can be further improved if the break separation notches associated with a respective bearing eye web are offset in the direction of the bearing axis.
  • Such an offset can be effected, for example, in that a fracture separation notch is formed on one bearing eye web on one side only at one end face region and on the diametrically opposite bearing eye land on one side only at the other end face region.
  • the comparatively short break separation notches are formed on a bearing eye web on a first, front end face and on the diametrically arranged bearing eye web on the second end face of the bearing eye, for example a connecting rod eye, which is rearward relative to the first end face.
  • the depth of the short one-sided break separation notches is for example less than 1 mm, preferably about 0.5 mm and the length less than 2 mm, preferably about 1, 3 mm.
  • the inventive method is particularly well suited for fracture separation of workpieces whose bearing surface and Rissleitkerben is case hardened and / or painted.
  • the workpiece to be fractured is a connecting rod of an internal combustion engine.
  • the fracture-cutting workpiece blank for example a connecting rod, accordingly has two or more fracture separation notches in bearing eye webs for crack initiation, which roughly predetermine the course of a fracture separation plane during fracture separation.
  • the fracture separation notches are approximately in the crack propagation direction. formed on the end face areas of the bearing, wherein the axes of the two break separation notches extend approximately perpendicular to the bearing axis.
  • One aspect of the invention is thus to form a fracture separation notch substantially only at end surface regions of second diametrically arranged bearing lugs. It is particularly preferred if these break separation notches are formed on each bearing eye web only on one side.
  • the Applicant reserves the right to make a separate independent claim on this one-sided design of the fracture separation notches in the region of the end surface areas of a bearing eye.
  • the workpiece blank, in particular the connecting rod can be subjected to a heat treatment prior to cracking, as described in the post-published patent application DE 10 2014 107 736 of the applicant.
  • Figure 1 is a schematic diagram of a workpiece blank according to the invention, which is fracture-separated by the method according to the invention;
  • Figure 2 is a front view of a large Pleuelauges the connecting rod according to Figure 1;
  • Figure 3 shows a bearing cap of the connecting rod according to Figures 1 and 2 after the fracture separation and
  • FIG. 1 shows by way of example a connecting rod 1 of an internal combustion engine which is intended to be fracture-separated by the method according to the invention.
  • This connecting rod will after the Breaking fracture machined mechanically finished, so that the connecting rod shown in the present application is also referred to as "workpiece blank".
  • the connecting rod 1 has a large connecting rod 2 and small connecting rod 4, between which a connecting rod 6 extends.
  • Break separation process is the connecting rod 1 in the region of the large connecting rod 2 in a connecting rod-side part 8 and a bearing cap 10 are fracture-separated. After the fracture separation, the two elements are joined again and screwed by means of two screws 12. These screws 12 can be loosely screwed in the fracture separation to prefix the bearing cap 10 with respect to the connecting rod side part 8.
  • the large connecting rod 2 has a bearing or peripheral surface 14 connected to the crankshaft of the internal combustion engine, to which, unlike conventional solutions, no fracture separation notch is formed.
  • the front is the big one
  • Connecting rod 2 executed with flat surfaces 16, of which only one is visible in the illustration of FIG. These annular planar surfaces 16 are in the range of
  • Pleuelaugenstegen 18, 20 interrupted or viewed continuously in the axial direction of the bearing eye downgraded, so that the projecting flat surfaces 16 run into the end faces 32, 34 of the large connecting rod 2.
  • de Rissleitbohrept 22, 24 are formed, of which, for simplicity, only the respective inner, adjacent to the peripheral surface 14 arranged Rissleitbohrept 22 and 24 with a Reference numerals are provided.
  • the three Rissleitbohronneitbohronne 22, 24 are not arranged on a line, but offset from each other, this offset is formed so that the later fracture separation plane 21 passes through the total twelve Rißleitbohronne 22, 24 therethrough.
  • the Rissleitbohronne 22, 24 each extend from the end face of the large connecting rod 2 into the region of a screw hole 13 for the screw 12. The further details about the geometry of the Rissleitbohronne will be explained below with reference to FIG 3.
  • the course of the fracture separation plane is also determined by two fracture separation notches 26 and 28, which are introduced on one side and which extend perpendicular to the bearing surface.
  • two fracture separation notches 26 and 28 which are introduced on one side and which extend perpendicular to the bearing surface.
  • Pleuelauges 2 is formed. This one-sided arrangement of the fracture separation notches 26, 28 is a peculiarity of the illustrated embodiment.
  • the Bruchleitkerben 26, 28 are very short and end at a distance from the peripheral surface 14. In principle, it is also conceivable, the Bruchleitkerben 26 longer form, so that they extend into the region of the other outer Rißleitbohrept.
  • the selected short geometry can be formed very easily by means of a laser, whereby unwanted microstructural transformations due to the low energy input are avoided.
  • the Bruchleitkerben can be formed with notch portions, as explained in the aforementioned prior art. Such notch sections can be created particularly easily by a fiber laser (see FIG. 4).
  • FIG. 2 shows an individual view of the large connecting rod eye 2 of the connecting rod 1 according to FIG. 1. Also visible are three of the trained on Pleuelaugensteg 18 Rißleitbohritch 22 and trained in this area Bruchtrennkerbe 26, which extends only between the inner peripheral surface 14 and the adjacent Rissleitbohrung 22, however, in the Distance to the peripheral surface ends and thus does not open in this.
  • the second, rear-trained fracture separation notch 28 is not visible in the illustration of Figure 2, however, for the sake of simplicity indicated.
  • the notch axis of the fracture separation Notches 26, 28 (horizontally in Figure 2 and Figure 3) thus extends perpendicular to the bearing axis Z.
  • a Crackdorn or the like is introduced into the connecting rod 2 for fracture separation and spread in the radial direction, so that a crack initiation along the one-sided and staggered arranged short Bruchleitkerben 26, 28 takes place by the introduced fracture separation forces. This break then continues through the respective adjacent Rissleitkerben 22, 24 through until the bearing cap 10 is separated from the connecting rod side part 8.
  • FIG. 3 shows the bearing cap 10 after the fracture separation. It can be seen in this illustration, the two screw holes 13 which penetrated each Pleuelaugensteg 18, 20. Transverse to the axis of these screw holes 13, the above-explained Rissleitbohritch 22 and 24 are formed. In the representation according to FIG. 3 it can be seen that these rip guidance bores 22, 24 are each designed as blind bores and extend on both sides from the respective end face 32 or 34 of the connecting rod eye webs 18, 20 into the region of the screw bore 13 and at a distance of this one ends.
  • the one-sided arrangement offset in the axial direction Z can be seen particularly clearly, the two break-apart notches 26, 28 being formed only in the web section extending between the internal crack guide notches 22, 24 and the peripheral surface 14 of the large connecting rod eye extends.
  • the crack guide bores 22, 24 have the further advantage that their peripheral walls are also hardened during nitriding, so that hardening zones are formed in the course of the fracture separation plane, which optimize the fracture separation behavior. Due to the height offset of the Rissleitbohrungen a "uneven" break separation surface is deliberately created, which allows a 10 positive centering when placing the bearing cap, so that a bandaging is not required.
  • FIG. 4 the region provided with the short fracture separation notch 26 is shown enlarged. It can be seen that the short fracture separation notch 26 on the one hand opens into the crack guide bore 22 and, on the other hand, terminates at a distance from the peripheral surface 14 / running surface. That is, the fracture separation grooves 26, 28 do not extend into the tread.
  • the notch portions 36 which are employed obliquely in a conventional manner and extend out of a base 38.
  • the approximately finger-shaped notch portions 36 and the base 38 can be filled with melt or else partially designed as a cavity.
  • the length of the Bruchleitkerben is in the illustrated connecting rod only a fraction of the wall thickness of Pleuelaugenstegs 20.
  • a length of 1, 3 mm and a depth of the notch of 0.5 mm may be sufficient.
  • the length I of the fracture separation notch 26 1, 3 mm and the depth t is about 0.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

L'invention concerne un procédé de séparation de pièces par rupture et une ébauche de pièces comportant des encoches de séparation par rupture d'un seul côté.
EP15770938.7A 2014-09-29 2015-09-29 Procédé de séparation de pièces par rupture et ébauche de pièces Withdrawn EP3200945A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014114148 2014-09-29
DE102015106956.3A DE102015106956A1 (de) 2014-09-29 2015-05-05 Verfahren zum Bruchtrennen von Werkstücken und Werkstückrohling
PCT/EP2015/072428 WO2016050771A1 (fr) 2014-09-29 2015-09-29 Procédé de séparation de pièces par rupture et ébauche de pièces

Publications (1)

Publication Number Publication Date
EP3200945A1 true EP3200945A1 (fr) 2017-08-09

Family

ID=55485922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15770938.7A Withdrawn EP3200945A1 (fr) 2014-09-29 2015-09-29 Procédé de séparation de pièces par rupture et ébauche de pièces

Country Status (3)

Country Link
EP (1) EP3200945A1 (fr)
DE (1) DE102015106956A1 (fr)
WO (1) WO2016050771A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10018221B2 (en) 2015-11-24 2018-07-10 Brp-Rotax Gmbh & Co. Kg Fracture-separated engine component and method for manufacturing same
CN106736318A (zh) * 2016-11-30 2017-05-31 吉林省牧巍电子设备制造有限公司 一种发动机连杆涨断加工方法
JP6958340B2 (ja) * 2017-12-25 2021-11-02 トヨタ自動車株式会社 コンロッドの製造方法及びコンロッド

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69405070T2 (de) * 1993-10-29 1998-01-15 Sintertech Verfahren zur Herstellung von miteinander verbindbare gesinterte Teile

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994054A (en) 1975-01-06 1976-11-30 Brunswick Corporation Multiple part tubular member and method and apparatus for manufacture thereof
ES2129240T5 (es) 1995-02-06 2007-06-16 Mauser-Werke Oberndorf Maschinenbau Gmbh Procedimiento para la separacion con ruptura de piezas de trabajo.
JP4171658B2 (ja) * 2003-02-10 2008-10-22 本田技研工業株式会社 コネクティングロッドの破断分割加工方法
DE102005031335B4 (de) 2004-06-29 2013-02-21 Mauser-Werke Oberndorf Maschinenbau Gmbh Verfahren zum Herstellen von Bruchtrennkerben und Werkstück
DE102010014085B4 (de) 2010-04-06 2016-02-18 Mauser-Werke Oberndorf Maschinenbau Gmbh Verfahren zum Bruchtrennen von Werkstücken und Werkstück
DE102012112539A1 (de) 2012-03-12 2013-09-12 Mauser-Werke Oberndorf Maschinenbau Gmbh Verfahren und Vorrichtung zum Bruchtrennen eines Werkstücks
DE102014117874A1 (de) 2013-12-05 2015-06-11 Mauser-Werke Oberndorf Maschinenbau Gmbh Verfahren und Werkstück

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69405070T2 (de) * 1993-10-29 1998-01-15 Sintertech Verfahren zur Herstellung von miteinander verbindbare gesinterte Teile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2016050771A1 *

Also Published As

Publication number Publication date
WO2016050771A1 (fr) 2016-04-07
DE102015106956A1 (de) 2016-03-31

Similar Documents

Publication Publication Date Title
EP2475897B1 (fr) Système d'entraînement en rotation
DE102011112148B4 (de) Extruder und Verfahren zum Herstellen eines Extruders
DE102012017525B4 (de) Verfahren zur umformenden Herstellung eines Zahnrads mit Außenverzahnung, sowie nach diesem Verfahren herstellbares Zahnrad mit Außenverzahnung
EP3582910B1 (fr) Procédé de laminage de type à clavette transversale de soupapes à disque
EP2825340A1 (fr) Procédé et dispositif de division d'une pièce par rupture
EP2641673B1 (fr) Procédé et dispositif de fabrication d'une section de raccordement comme élément d'un outil
DE102014105400A1 (de) Verfahren zum Herstellen von Radschüsselformen auf Drückwalzmaschinen, Fahrzeugrad mit einer solchen Radschüsselform und Drückfutter für Drückwalzmaschinen zum Herstellen entsprechender Radschüsselformen
EP3200945A1 (fr) Procédé de séparation de pièces par rupture et ébauche de pièces
EP3093119A1 (fr) Vis d'extrudeuse et procede de sa reequipement
DE102014208140A1 (de) Schnittstelle
DE102010054476A1 (de) Verfahren zum Herstellen eines Gewindes in einem Werkstück
EP3362705A1 (fr) Couronne à denture intérieure et à denture frontale, ainsi que procédé de fabrication associé et boîte de vitesses dotée d'une telle couronne
DE102014117874A1 (de) Verfahren und Werkstück
EP2149411B1 (fr) Marteau pour une machine à rétreindre rotative
DE102005031335B4 (de) Verfahren zum Herstellen von Bruchtrennkerben und Werkstück
DE102012109125A1 (de) Lenkvorrichtung mit Winkelbegrenzung für Torsionsstab
AT405857B (de) Schliesszylinder-flachschlüsselschaftkörper
EP0865847B1 (fr) Procédé de production d'un foret
EP3863780B1 (fr) Procédé et dispositif pour matricer des structures superficielles dans une face intérieure d'un tube ou d'une tige de soupape de moteur
WO2017220202A1 (fr) Procédé de fabrication d'une unité tige de piston et d'un arbre creux
EP2483027A1 (fr) Procédé de fabrication d'une denture intérieure et élément à denture intérieure
DE102016108466B4 (de) Mehrstufiges Verfahren zum Umformen von Werkstoffen
DE3203343A1 (de) Dorn zum kaltschmieden von innenprofilierten rohrkoerpern oder zylindern
DE102011075549A1 (de) Verfahren zur Herstellung eines Lagerrings
WO2006000463A1 (fr) Procede pour separer par rupture une piece et piece separee selon le procede

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20170427

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20180220

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180904