EP1521662A1 - Method for the production of a connecting rod for a reciprocating piston engine - Google Patents

Method for the production of a connecting rod for a reciprocating piston engine

Info

Publication number
EP1521662A1
EP1521662A1 EP03763716A EP03763716A EP1521662A1 EP 1521662 A1 EP1521662 A1 EP 1521662A1 EP 03763716 A EP03763716 A EP 03763716A EP 03763716 A EP03763716 A EP 03763716A EP 1521662 A1 EP1521662 A1 EP 1521662A1
Authority
EP
European Patent Office
Prior art keywords
connecting rod
eye
blank
rod eye
laser cutting
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Withdrawn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
EP03763716A
Other languages
German (de)
French (fr)
Inventor
Ernst Arnold
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.)
Motorenfabrik Hatz GmbH and Co KG
Original Assignee
Motorenfabrik Hatz GmbH and Co 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 Motorenfabrik Hatz GmbH and Co KG filed Critical Motorenfabrik Hatz GmbH and Co KG
Publication of EP1521662A1 publication Critical patent/EP1521662A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • 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
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/04—Connecting rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49288—Connecting rod making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49288—Connecting rod making
    • Y10T29/49291—Connecting rod making including metal forging or die shaping

Definitions

  • the invention relates to a method for producing a connecting rod of a reciprocating piston machine from a cast or forged blank with a large and a small connecting rod eye, the large connecting rod eye being divided in a preprocessing step along a parting plane running through the eye axis, previously in a first clamping of the blank the front flat surfaces are ground.
  • the connecting rod blank is first pre-ground on its flat surfaces, after which the bearing bore e.g. is divided by sawing and pre-drilled after the two parts have been clamped together (cf. DE 4306280 AI).
  • the bearing bore of the blank is expediently oval, so that a circular cross-section is formed after taking the saw cut into account.
  • the two connecting rod parts are processed separately in a machining center, namely by milling the parting surfaces, spindles the fitting bores and cutting the threads for the clamping screws and milling the contact surfaces for the screw heads.
  • the fine machining only takes place after the two connecting rod parts have been screwed together, namely the final grinding of the flat surfaces, the fine drilling of the bearing eye and the bush pressed into the piston pin bore.
  • a certain simplification can be achieved by the also known manufacturing method of connecting rod manufacturing (cf. DE 19829147 AI).
  • connecting rod manufacturing cf. DE 19829147 AI
  • two diametrically opposed laser notches are made on the inner circumferential surface of the large connecting rod eye (cf. DE 19534360 C2).
  • the elaborate separating cut for producing the two workpiece parts, connecting rod and connecting rod cover, is indeed omitted here; on the other hand, there are increased expenses on the device side, since it is important to transmit particularly high breaking forces on the one hand and, on the other hand, to absorb them using suitable tensioning devices and to remove them in the device base or the foundations.
  • the present invention has for its object to improve the known manufacturing processes by reducing the manufacturing effort while improving the requirements for automation and environmental friendliness.
  • this object is achieved in connection with the method mentioned in the introduction in that after grinding the flat surfaces of the blank in a second clamping operation, first the contour of the large connecting rod eye and then the division pattern in the parting plane are generated by laser cutting.
  • Newer technologies enable the use of laser cutting with high precision, even from relatively strong starting materials for reasonable investments. For example, workpieces with a material thickness of approx. 30 mm can be processed at a cutting speed of approx. 400 mm / min. The control of the cutting process takes place with an accuracy of at least 0.1 mm center deviation with a cutting width of approximately 0.2 mm.
  • the contour of the large connecting rod eye corresponds to a circular cut, the diameter of which is undersized from 0.5 to 1.5 mm compared to the bearing diameter, preferably 0.6 to 1.0 mm.
  • the contour of the large connecting rod eye corresponds to an oval cut, with a longitudinal extension of 0.5 to 2 mm, preferably approximately 1 mm, being symmetrical to the parting plane.
  • the cutting width of about 0.2 mm which is already small in laser cutting
  • the Material removal due to the later finishing of the parting surfaces must be taken into account.
  • the undersize parts of the circular arc must be produced as listed above, so that there is sufficient waste for the subsequent finishing of the large and small connecting rod eyes by fine drilling, which may be preceded by a pre-spindle.
  • the small connecting rod eye can also be cut from solid material, so that there is no need for cores when forging or casting the blank. It goes without saying that after laser cutting the small connecting rod eye and before inserting the bearing bush, a fine machining of the eye, e.g. by spindles or rubbing is appropriate.
  • Such fine machining also takes place on the large connecting rod eye, namely after the connecting rod and connecting rod cover have been screwed on, the fine machining again being carried out by spindles or rubbing. Another fine boring process can follow. The latter also applies to the small connecting rod eye after inserting the bearing bush, which is machined in the same setting as the large connecting rod eye.
  • the workpiece is further processed in a conventional manner as a connecting rod and connecting rod cover after the preliminary processing by laser cutting in a third setting in a machining center.
  • the inclusion of laser cutting in the connecting rod manufacturing process gives clear advantages that speak in favor of the use of this new technology in the pre-processing of the blanks. With a small cutting width and the associated material savings, every chip is avoided. This not only has an advantageous impact in terms of the associated lower environmental impact; by avoiding large chip volumes, the difficulties associated with their elimination in automation are avoided.
  • both the separating cut and the production of the two connecting rod eyes are carried out by laser cutting, there is also a significant reduction in the machining time compared to conventional machining.
  • a particular advantage in favor of laser cutting is the associated extremely low clamping forces as a result of the very low cutting pressures during laser cutting. This fact favors the fixture construction, which is important for automation. Relatively small clamping devices are sufficient to hold the workpiece during laser cutting, as a result of which the costs of the clamping devices and the space requirement associated therewith are noticeably reduced.
  • Laser cutting can be used on both cast and forged blanks.
  • 42 CrMo4 is suitable as forged steel.
  • FIG. 1 is a view of a connecting rod blank
  • FIG. 1 is a side view of FIG. 1,
  • Fig. 5 is a view of the connecting rod
  • FIG. 6 shows a side view of FIG. 5.
  • a connecting rod blank 1 which can be made as a cast or forged part. It has two connecting rod eyes, namely the small connecting rod eye 2 and the large connecting rod eye 3.
  • the so-called piston pin bore arises from the small connecting rod eye 2, which engages around the piston pin of the piston when installed in a reciprocating piston engine;
  • the so-called bearing bore which engages around the crankshaft during installation, is created from the large connecting rod eye 3.
  • the cutting plane of the laser cut is specified, by which the parting plane 4 between the connecting rod 5 and the connecting rod cover 6 is defined.
  • Flat surfaces 13 form the end faces of the connecting rod eyes.
  • a circular cross section of the large connecting rod eye 3 is provided.
  • the intended cutting width of the laser cut of approximately 0.2 mm and the reworking of the parting surfaces are balanced must be that the diameter of the circular laser cut is dimensioned with a corresponding undersize, which is preferably between 0.6 and 1.0 mm. Only by boring in the course of the subsequent finishing does a circular hole in the form of the bearing hole again result, in which a bearing shell is received during later installation.
  • the laser can also be guided after an oval cut by straightening the bearing eye on both sides of the parting plane.
  • the cross-sectional shape of the large connecting rod eye is made up of the two opposite semicircular sections and the straight extension of approx. 1 mm connecting them on both sides, so that an oval is created overall.
  • the parting surfaces adjacent to the parting plane 4 which are initially formed by laser cutting, e.g. processed by milling until the exact semicircular dimension is reached.
  • the small connecting rod eye 2 it is produced by a correspondingly circular laser cut with a small undersize, which is later finished by spindles or rubbing, so that a bearing bush can be fitted therein.
  • the connecting rod blank 1 can already have a corresponding bore for the small connecting rod eye 2, as shown in FIGS. 1 and 2.
  • the small connecting rod eye 2 but can also be made from solid material by laser cutting.
  • FIG. 3 shows the connecting rod 5 after machining the parting surfaces 7 and drilling the fitting bore 8 and screwing in the thread 9 for the clamping screws for connecting the connecting rod 5 to the connecting rod cover 6, which is shown in FIG. 4.
  • the fitting bore 8 of the connecting rod cover 6 is followed by a slightly larger connecting bore 10, at the mouth of which the head 11 of the respective clamping screw is supported, as shown in FIGS. 5 and 6 using the example of the fully assembled connecting rod 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention relates to a method for the production of a connecting rod for a reciprocating piston engine, made from a cast or forged blank (1), comprising a small connecting rod eye (2) and a large connecting rod eye (3). The large connecting rod eye (3) is divided along a separation plane (4), running through the eye axis in a pre-machining step, whereby previously, in a first machining of the blank (1), the front plane surfaces (13) thereof are ground. After grinding of the plane surfaces (13) of the blank (1), a second machining thereof is carried out for generation firstly of the shape of the large connecting rod eye (3) and subsequently the division line in the separation plane (4) by means of laser cutting.

Description

Verfahren zum Herstellen eines Pleuels einer HubkolbenmaschineMethod of manufacturing a connecting rod of a reciprocating machine
Die Erfindung betrifft ein Verfahren zum Herstellen eines Pleuels einer Hubkolbenmaschine aus einem gegossenen oder geschmiedeten Rohling mit einem großen und einem kleinen Pleuelauge, wobei in einem Vorbearbeitungsschritt das große Pleuelauge längs einer durch die Augenachse verlaufenden Trennebene geteilt wird, wobei vorher in einer ersten Aufspannung des Rohlings dessen stirnseitige Planflächen geschliffen werden.The invention relates to a method for producing a connecting rod of a reciprocating piston machine from a cast or forged blank with a large and a small connecting rod eye, the large connecting rod eye being divided in a preprocessing step along a parting plane running through the eye axis, previously in a first clamping of the blank the front flat surfaces are ground.
Es entspricht dem allgemein bekannten Vorgehen bei der Pleuelherstellung, daß der Pleuelrohling zunächst an seinen Planflächen vorgeschliffen wird, wonach in einer weiteren Aufspannung die Lagerbohrung z.B. durch Sägen geteilt und nach dem Zusammenspannen der beiden Teile vorgebohrt wird (vgl. DE 4306280 AI) . Die Lagerbohrung des Rohlings ist dabei zweckmäßigerweise oval ausgebildet, so daß unter Berücksichtigung des Sägeverschnitts nach dem Zusammenfügen ein kreisförmiger Querschnitt entsteht. Nach dieser Vorbearbeitung, zu welcher auch noch das Bohren der Kolbenbolzenbohrung zählt, werden die beiden Pleuelteile getrennt in einem Bearbeitungszentrum weiterbearbeitet, nämlich durch Fräsen der Trennflächen, Spindeln der Paßbohrungen und Schneiden der Gewinde für die Spannschrauben sowie Fräsen der Auflageflächen für die Schraubenköpfe. Erst nach dem Verschrauben der beiden Pleuelteile erfolgt die Feinbearbeitung, nämlich das Fertigschleifen der Planflächen, das Feinbohren des Lagerauges sowie der in die Kolbenbolzenbohrung eingepreßten Büchse.It corresponds to the generally known procedure for connecting rod manufacture that the connecting rod blank is first pre-ground on its flat surfaces, after which the bearing bore e.g. is divided by sawing and pre-drilled after the two parts have been clamped together (cf. DE 4306280 AI). The bearing bore of the blank is expediently oval, so that a circular cross-section is formed after taking the saw cut into account. After this preprocessing, which also includes drilling the piston pin bore, the two connecting rod parts are processed separately in a machining center, namely by milling the parting surfaces, spindles the fitting bores and cutting the threads for the clamping screws and milling the contact surfaces for the screw heads. The fine machining only takes place after the two connecting rod parts have been screwed together, namely the final grinding of the flat surfaces, the fine drilling of the bearing eye and the bush pressed into the piston pin bore.
Auf diese Weise spanabhebend bearbeitete Pleuelrohlinge erfordern bei hohem Platzbedarf einen beträchtlichen Aufwand an Bearbeitungsstationen. Die den Schnittdrük- ken entsprechenden hohen Spannkräfte zum Einspannen des Werkstücks bedingen mit zunehmendem Automatisierungs- grad einen erheblichen Vorrichtungsaufwand. Hinzu kommen nicht unerhebliche Aufwendungen für eine reibungslose, den automatischen Bearbeitungsablauf nicht behindernde Beseitigung der Späne.Connecting rod blanks machined in this way require a considerable amount of space Effort at processing stations. The high clamping forces for clamping the workpiece, which correspond to the cutting pressures, require a considerable amount of fixtures as the degree of automation increases. In addition, there are not inconsiderable expenses for a smooth removal of the chips, which does not hinder the automatic machining process.
Eine gewisse Vereinfachung ist durch das ebenfalls bekannte Herstellungsverfahren der Bruchpleuel-Fertigung erzielbar (vgl. DE 19829147 AI) . Um die Bruchebene vorzugeben, werden an der Innenumfangsflache des großen Pleuelauges zwei diametral gegenüberliegende Laserkerben eingebracht (vgl. DE 19534360 C2). Hierbei entfällt zwar der aufwändige Trennschnitt zur Herstellung der beiden Werkstückteile Pleuelstange und Pleueldeckel; andererseits kommen erhöhte Aufwendungen auf der Vorrichtungsseite hinzu, da es gilt, besonders hohe Bruchkräfte einerseits zu übertragen und andererseits wiederum über geeignete Spannvorrichtungen aufzunehmen und in den Geräteunterbau bzw. die Fundamente abzutragen.A certain simplification can be achieved by the also known manufacturing method of connecting rod manufacturing (cf. DE 19829147 AI). In order to specify the fracture plane, two diametrically opposed laser notches are made on the inner circumferential surface of the large connecting rod eye (cf. DE 19534360 C2). The elaborate separating cut for producing the two workpiece parts, connecting rod and connecting rod cover, is indeed omitted here; on the other hand, there are increased expenses on the device side, since it is important to transmit particularly high breaking forces on the one hand and, on the other hand, to absorb them using suitable tensioning devices and to remove them in the device base or the foundations.
Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, die bekannten Herstellungsverfahren zu verbessern durch Reduzierung des Herstellungsaufwands bei gleichzeitiger Verbesserung der Voraussetzungen für die Automatisierung und der Umweltverträglichkeit .In contrast, the present invention has for its object to improve the known manufacturing processes by reducing the manufacturing effort while improving the requirements for automation and environmental friendliness.
Erfindungsgemäß wird diese Aufgabe in Verbindung mit dem eingangs genannten Verfahren dadurch gelöst, daß nach dem Schleifen der Planflächen des Rohlings in einer zweiten Aufspannung desselben zuerst die Kontur des großen Pleuelauges und danach der Teilungsverlauf in der Trennebene durch Laserschneiden erzeugt werden. Neuere Techniken ermöglichen die Anwendung des Laserschneidens mit hoher Präzision auch von verhältnismäßig starken Ausgangsmaterialien zu vertretbaren Investitionen. Beispielsweise können Werkstücke mit Materialdik- ken von ca. 30 mm mit einer Schneidgeschwindigkeit von ca. 400 mm/min bearbeitet werden. Die Steuerung des Schnittverlaufs erfolgt dabei mit einer Genauigkeit von wenigstens 0 , 1 mm Mittenabweichung bei einer Schnittbreite von etwa 0,2 mm. Zwar sind die Anschaffungskosten derartiger Laserschneider noch verhältnismäßig hoch; dafür entfallen vorliegend die Schneidwerkzeuge für den Trennschnitt in der Trennebene; außerdem entfallen die Bohr- bzw. Fräswerkzeuge zur Vorbearbeitung des großen Pleuelauges sowie des am gegenüberliegenden Ende des Pleuels vorgesehenen Kolbenbolzenauges.According to the invention, this object is achieved in connection with the method mentioned in the introduction in that after grinding the flat surfaces of the blank in a second clamping operation, first the contour of the large connecting rod eye and then the division pattern in the parting plane are generated by laser cutting. Newer technologies enable the use of laser cutting with high precision, even from relatively strong starting materials for reasonable investments. For example, workpieces with a material thickness of approx. 30 mm can be processed at a cutting speed of approx. 400 mm / min. The control of the cutting process takes place with an accuracy of at least 0.1 mm center deviation with a cutting width of approximately 0.2 mm. The acquisition costs of such laser cutters are still relatively high; for this, the cutting tools for the parting cut in the parting plane are omitted here; in addition, there are no drilling or milling tools for pre-machining the large connecting rod eye and the piston pin eye provided on the opposite end of the connecting rod.
Im Rahmen der vorliegenden Erfindung werden nicht nur der ebene Trennschnitt sondern auch die Rundschnitte zum Bearbeiten der beiden Pleuelaugen nach dem Verfahren des Laserschneidens durchgeführt .In the context of the present invention, not only the plane separating cut but also the round cuts for machining the two connecting rod eyes are carried out using the laser cutting method.
Dabei ist es zweckmäßig, daß die Kontur des großen Pleuelauges einem kreisförmigen Schnittverlauf entspricht, wobei dessen Durchmesser ein Untermaß von 0,5 bis 1,5 mm gegenüber dem Lagerdurchmesser aufweist, bevorzugt 0,6 bis 1,0 mm beträgt.It is expedient that the contour of the large connecting rod eye corresponds to a circular cut, the diameter of which is undersized from 0.5 to 1.5 mm compared to the bearing diameter, preferably 0.6 to 1.0 mm.
In einer Variante kann vorgesehen sein, daß die Kontur des großen Pleuelauges einem ovalen Schnittverlauf entspricht, wobei eine zur Trennebene symmetrische Längs- Streckung von 0,5 bis 2 mm, bevorzugt etwa 1 mm, erzeugt wird. Auf diese Weise ist es problemlos möglich, die beim Laserschneiden ohnehin geringe Schnittbreite von etwa 0,2 mm auszugleichen, wobei noch die Materialabtragung durch die spätere Fertigbearbeitung der Trennflächen zu berücksichtigen ist. Auch im Falle des ovalen Schnittverlaufs sind die Kreisbogenanteile mit Untermaß wie oben aufgeführt, herzustellen, damit für die spätere Fertigbearbeitung des großen und des kleinen Pleuelauges durch Feinbohren, dem gegebenenfalls noch ein Vorspindeln vorausgeht, genügend Verschnitt vorhanden ist .In a variant, it can be provided that the contour of the large connecting rod eye corresponds to an oval cut, with a longitudinal extension of 0.5 to 2 mm, preferably approximately 1 mm, being symmetrical to the parting plane. In this way, it is easily possible to compensate for the cutting width of about 0.2 mm, which is already small in laser cutting, with the Material removal due to the later finishing of the parting surfaces must be taken into account. Even in the case of an oval cut, the undersize parts of the circular arc must be produced as listed above, so that there is sufficient waste for the subsequent finishing of the large and small connecting rod eyes by fine drilling, which may be preceded by a pre-spindle.
Je nach Ausbildung des Rohlings kann auch das kleine Pleuelauge aus Vollmaterial geschnitten werden, so daß beim Schmieden bzw. Gießen des Rohlings Aufwendungen für Kerne entfallen können. Es versteht sich von selbst, daß nach dem Laserschneiden des kleinen Pleuelauges und vor dem Einsetzen der Lagerbüchse noch eine Feinbearbeitung des Auges, z.B. durch Spindeln oder Reiben zweckmäßig ist.Depending on the design of the blank, the small connecting rod eye can also be cut from solid material, so that there is no need for cores when forging or casting the blank. It goes without saying that after laser cutting the small connecting rod eye and before inserting the bearing bush, a fine machining of the eye, e.g. by spindles or rubbing is appropriate.
Eine derartige Feinbearbeitung findet auch an dem großen Pleuelauge statt, nämlich nach dem Verschrauben von Pleuelstange und Pleueldeckel, wobei die Feinbearbeitung wiederum durch Spindeln oder Reiben erfolgt . Ein weiterer Bearbeitungsvorgang des Feinbohrens kann sich noch anschließen. Letzteres trifft auch auf das kleine Pleuelauge nach dem Einsetzen der Lagerbüchse zu, welche in der gleichen Aufspannung wie das große Pleuelauge bearbeitet wird.Such fine machining also takes place on the large connecting rod eye, namely after the connecting rod and connecting rod cover have been screwed on, the fine machining again being carried out by spindles or rubbing. Another fine boring process can follow. The latter also applies to the small connecting rod eye after inserting the bearing bush, which is machined in the same setting as the large connecting rod eye.
Im übrigen gilt im Anschluß an das erfindungsgemäße Herstellungsverfahren, daß das Werkstück nach der Vorbearbeitung durch das Laserschneiden in einer dritten Aufspannung in einem Bearbeitungszentrum auf herkömmliche Weise getrennt als Pleuelstange und Pleueldeckel weiterbearbeitet wird. Insgesamt betrachtet ergeben sich durch die Einbeziehung des Laserschneidens in den Herstellungsprozeß des Pleuels deutlich Vorteile, die zu Gunsten des Einsatzes dieser neuen Technologie im Rahmen der Vorbearbeitung der Rohlinge sprechen. Bei geringer Schnittbreite und damit verbundener Materialeinsparung wird jeder Spananfall vermieden. Dies hat nicht nur eine vorteilhafte Auswirkung in Bezug auf die damit verbundene geringere Umweltbelastung; durch die Vermeidung großer Spanvolumina werden die mit deren Beseitigung verbundenen Schwierigkeiten bei der Automatisierung vermieden.For the rest, following the manufacturing method according to the invention, the workpiece is further processed in a conventional manner as a connecting rod and connecting rod cover after the preliminary processing by laser cutting in a third setting in a machining center. All in all, the inclusion of laser cutting in the connecting rod manufacturing process gives clear advantages that speak in favor of the use of this new technology in the pre-processing of the blanks. With a small cutting width and the associated material savings, every chip is avoided. This not only has an advantageous impact in terms of the associated lower environmental impact; by avoiding large chip volumes, the difficulties associated with their elimination in automation are avoided.
Erfolgt sowohl der Trennschnitt als auch die Herstellung der beiden Pleuelaugen durch Laserschneiden, so ergibt sich zudem eine deutliche Reduzierung der Bearbeitungszeit verglichen mit der herkömmlichen spanabhebenden Bearbeitung.If both the separating cut and the production of the two connecting rod eyes are carried out by laser cutting, there is also a significant reduction in the machining time compared to conventional machining.
Ein besonderer Vorteil zu Gunsten des Laserschneidens sind die damit verbundenen äußerst geringen Spannkräfte als Folge der sehr kleinen Schneiddrücke beim Laserschneiden. Dieser Umstand begünstigt in besonderer Weise den für die Automatisierung wichtigen Vorrichtungsbau. Es genügen verhältnismäßig kleine Spannvorrichtungen zum Halten des Werkstücks während des Laserschneidens, wodurch die Kosten der Spannvorrichtungen und der damit verbundene Platzbedarf spürbar reduziert werden.A particular advantage in favor of laser cutting is the associated extremely low clamping forces as a result of the very low cutting pressures during laser cutting. This fact favors the fixture construction, which is important for automation. Relatively small clamping devices are sufficient to hold the workpiece during laser cutting, as a result of which the costs of the clamping devices and the space requirement associated therewith are noticeably reduced.
Das Laserschneiden kann sowohl bei gegossenen als auch bei geschmiedeten Rohlingen eingesetzt werden. Geeignet ist beispielsweise als Schmiedestahl 42 CrMo4. Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert. Es zeigenLaser cutting can be used on both cast and forged blanks. For example, 42 CrMo4 is suitable as forged steel. In the following an embodiment of the invention is explained with reference to the drawing. Show it
Fig. 1 eine Ansicht eines Pleuelrohlings,1 is a view of a connecting rod blank,
Fig. 2 eine Seitenansicht zu Fig. 1,2 is a side view of FIG. 1,
Fig. 3 eine Ansicht der Pleuelstange, teilweise geschnitten,3 is a view of the connecting rod, partially in section,
Fig. 4 eine Ansicht des Pleueldeckels, teilweise geschnitten,4 is a view of the connecting rod cover, partially in section,
Fig. 5 eine Ansicht des montierten Pleuels undFig. 5 is a view of the connecting rod and
Fig. 6 eine Seitenansicht zu Figur 5.6 shows a side view of FIG. 5.
Gemäß den Figuren 1 und 2 ist ein Pleuelrohling 1 dargestellt, welcher als Guß- oder Schmiedeteil hergestellt sein kann. Er besitzt zwei Pleuelaugen, nämlich das kleine Pleuelauge 2 und das große Pleuelauge 3. Nach entsprechender Bearbeitung entsteht aus dem kleinen Pleuelauge 2 die sog. Kolbenbolzenbohrung, welche im Einbau in einem Hubkolbenmotor den Kolbenbolzen des Kolbens umgreift; aus dem großen Pleuelauge 3 entsteht die sog. Lagerbohrung, welche im Einbau die Kurbelwelle umgreift .According to Figures 1 and 2, a connecting rod blank 1 is shown, which can be made as a cast or forged part. It has two connecting rod eyes, namely the small connecting rod eye 2 and the large connecting rod eye 3. After appropriate processing, the so-called piston pin bore arises from the small connecting rod eye 2, which engages around the piston pin of the piston when installed in a reciprocating piston engine; The so-called bearing bore, which engages around the crankshaft during installation, is created from the large connecting rod eye 3.
Bei dem gezeichneten Ausführungsbeispiel ist die Schnittebene des Laserschnitts angegeben, durch welche die Trennebene 4 zwischen der Pleuelstange 5 und dem Pleueldeckel 6 definiert ist. Planflächen 13 bilden die Stirnseiten der Pleuelaugen.In the illustrated embodiment, the cutting plane of the laser cut is specified, by which the parting plane 4 between the connecting rod 5 and the connecting rod cover 6 is defined. Flat surfaces 13 form the end faces of the connecting rod eyes.
Bei dem in den Figuren 1 und 2 gezeichneten Rohling ist ein kreisförmiger Querschnitt des großen Pleuelauges 3 vorgesehen. Das bedeutet, daß die vorgesehene Schnittbreite des Laserschnitts von etwa 0,2 mm und die Nachbearbeitung der Trennflächen dadurch ausgeglichen werden müssen, daß der Durchmesser des kreisförmigen Laserschnitts mit einem entsprechenden Untermaß bemessen wird, welches bevorzugt zwischen 0,6 und 1,0 mm liegt. Erst durch das Aufbohren im Zuge der nachfolgenden Feinbearbeitung ergibt sich dann wieder eine kreisförmige Bohrung in Form der Lagerbohrung, in welcher beim späterem Einbau eine Lagerschale aufgenommen wird.In the blank shown in FIGS. 1 and 2, a circular cross section of the large connecting rod eye 3 is provided. This means that the intended cutting width of the laser cut of approximately 0.2 mm and the reworking of the parting surfaces are balanced must be that the diameter of the circular laser cut is dimensioned with a corresponding undersize, which is preferably between 0.6 and 1.0 mm. Only by boring in the course of the subsequent finishing does a circular hole in the form of the bearing hole again result, in which a bearing shell is received during later installation.
Anstelle des kreisförmigen Schnittverlaufs beim Vorschneiden des großen Pleuelauges durch Laserschneiden kann der Laser auch nach einem ovalen Schnittverlauf geführt werden, indem das Lagerauge zu beiden Seiten der Trennebene geradlinig gestreckt wird. Das bedeutet, daß sich die Querschnittsform des großen Pleuelauges zusammensetzt aus den beiden gegenüberliegenden Halbkreisabschnitten und der diese beidseitig verbindenden geradlinigen Verlängerung von ca. 1 mm, so daß insgesamt ein Oval entsteht. In diesem Fall werden bei der späteren Feinbearbeitung die an die Trennebene 4 angrenzenden Trennflächen, welche zunächst durch das Laserschneiden gebildet werden, z.B. durch Fräsen bis zum Erreichen des genauen Halbkreismaßes bearbeitet . Nach der Montage der beiden Pleuelteile ergibt sich dann eine kreisförmige Lagerbohrung, die lediglich noch einer Kalibrierung durch Feinbohren bedarf.Instead of the circular cut when pre-cutting the large connecting rod eye by laser cutting, the laser can also be guided after an oval cut by straightening the bearing eye on both sides of the parting plane. This means that the cross-sectional shape of the large connecting rod eye is made up of the two opposite semicircular sections and the straight extension of approx. 1 mm connecting them on both sides, so that an oval is created overall. In this case, during the later fine machining, the parting surfaces adjacent to the parting plane 4, which are initially formed by laser cutting, e.g. processed by milling until the exact semicircular dimension is reached. After the assembly of the two connecting rod parts, there is a circular bearing bore that only needs calibration by fine boring.
Was das kleine Pleuelauge 2 betrifft, so wird es durch einen entsprechend kreisförmig geführten Laserschnitt mit geringem Untermaß hergestellt, der später durch Spindeln oder Reiben feinbearbeitet wird, so daß darin eine Lagerbüchse eingepaßt werden kann. Bereits der Pleuelrohling 1 kann eine entsprechende Bohrung für das kleine Pleuelauge 2 aufweisen, wie in den Figuren 1 und 2 dargestellt. Alternativ kann das kleine Pleuelauge 2 aber auch aus Vollmaterial durch Laserschneiden hergestellt werden.As for the small connecting rod eye 2, it is produced by a correspondingly circular laser cut with a small undersize, which is later finished by spindles or rubbing, so that a bearing bush can be fitted therein. The connecting rod blank 1 can already have a corresponding bore for the small connecting rod eye 2, as shown in FIGS. 1 and 2. Alternatively, the small connecting rod eye 2 but can also be made from solid material by laser cutting.
Fig. 3 zeigt die Pleuelstange 5 nach Bearbeitung der Trennflächen 7 sowie Bohren der Passbohrung 8 und Eindrehen des Gewindes 9 für die Spannschrauben zum Verbinden der Pleuelstange 5 mit dem Pleueldeckel 6, welcher in Fig. 4 dargestellt ist.FIG. 3 shows the connecting rod 5 after machining the parting surfaces 7 and drilling the fitting bore 8 and screwing in the thread 9 for the clamping screws for connecting the connecting rod 5 to the connecting rod cover 6, which is shown in FIG. 4.
Gemäß Fig. 4 schließt sich an die Passbohrung 8 des Pleueldeckels 6 eine geringfügig größer dimensionierte Verbindungsbohrung 10 an, an deren Mündung der Kopf 11 der jeweiligen Spannschraube abgestützt ist, wie in den Figuren 5 und 6 am Beispiel des fertigmontierten Pleuels 12 dargestellt. 4, the fitting bore 8 of the connecting rod cover 6 is followed by a slightly larger connecting bore 10, at the mouth of which the head 11 of the respective clamping screw is supported, as shown in FIGS. 5 and 6 using the example of the fully assembled connecting rod 12.

Claims

Ansprüche Expectations
1. Verfahren zum Herstellen eines Pleuels (12) einer Hubkolbenmaschine aus einem gegossenen oder geschmiedeten Rohling (1) mit einem kleinen (2) und einem großen Pleuelauge (3) , wobei in einem Vorbearbeitungsschritt das große Pleuelauge (3) längs einer durch die Augenachse verlaufenden Trennebene (4) geteilt wird, wobei vorher in einer ersten Aufspannung des Rohlings (1) dessen stirnseitige Planflächen (13) geschliffen werden, dadurch gekennzeichnet, daß nach dem Schleifen der Planflächen (13) des Rohlings (1) in einer zweiten Aufspannung desselben zuerst die Kontur des großen Pleuelauges (3) und danach der Teilungsverlauf in der Trennebene (4) durch Laserschneiden erzeugt werden.1. A method for producing a connecting rod (12) of a reciprocating piston machine from a cast or forged blank (1) with a small (2) and a large connecting rod eye (3), wherein in a pre-processing step the large connecting rod eye (3) along one through the eye axis running parting plane (4) is divided, the end faces (13) of the blank (1) being ground in a first clamping of the blank, characterized in that after grinding the flat surfaces (13) of the blank (1) in a second clamping thereof First the contour of the large connecting rod eye (3) and then the division course in the parting plane (4) are generated by laser cutting.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in der zweiten Aufspannung auch die Kontur des kleinen Pleuelauges (2) des Pleuels durch Laserschneiden erzeugt wird.2. The method according to claim 1, characterized in that in the second clamping also the contour of the small connecting rod eye (2) of the connecting rod is generated by laser cutting.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Kontur des großen Pleuelauges (3) einem kreisförmigen Schnittverlauf entspricht, wobei dessen Durchmesser ein Untermaß von 0,5 bis 1,5 mm gegenüber dem Lagerdurchmesser aufweist.3. The method according to claim 1, characterized in that the contour of the large connecting rod eye (3) corresponds to a circular section, the diameter of which has an undersize of 0.5 to 1.5 mm compared to the bearing diameter.
4. Verfahren nach Anspruch 3 , dadurch gekennzeichnet, daß das Untermaß 0,6 bis 1,0 mm beträgt. 4. The method according to claim 3, characterized in that the undersize is 0.6 to 1.0 mm.
5. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Kontur des großen Pleuelauges (3) einem ovalen Schnittverlauf entspricht, wobei eine zur Trennebene (4) symmetrische Längsstreckung von 0,5 bis 2 mm erzeugt wird.5. The method according to claim 1, characterized in that the contour of the large connecting rod eye (3) corresponds to an oval section, with a symmetrical to the parting plane (4) longitudinal extension of 0.5 to 2 mm is generated.
6. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß beim Laserschneiden eine Schnittbreite von etwa 0,2 mm eingestellt wird.6. The method according to claim 1, characterized in that a cutting width of about 0.2 mm is set during laser cutting.
7. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß für die Vorbearbeitung durch Laserschneiden eine Genauigkeit der Schnittführung von etwa 0,1 mm durch eine entsprechende Programmsteuerung eingestellt wird.7. The method according to claim 1, characterized in that for the pre-processing by laser cutting an accuracy of the cut of about 0.1 mm is set by a corresponding program control.
8. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß der Rohling (1) des Pleuels (12) nach der Vorbearbeitung durch das Laserschneiden in einer dritten Aufspannung in einem Bearbeitungszentrum auf herkömmliche Weise getrennt als Pleuelstange (5) und Pleueldeckel (6) weiterbearbeitet wird.8. The method according to claim 1, characterized in that the blank (1) of the connecting rod (12) after the pre-processing by laser cutting in a third setting in a machining center in a conventional manner separately as a connecting rod (5) and connecting rod cover (6) is further processed ,
9. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das kleine Pleuelauge (2) durch Spindeln oder Reiben feinbearbeitet wird.9. The method according to claim 1, characterized in that the small connecting rod eye (2) is machined by spindles or rubbing.
10. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das große Pleuelauge (3) nach dem Verschrauben von Pleuelstange (5) und Pleueldeckel (6) durch Spindeln oder Reiben feinbearbeitet wird. 10. The method according to claim 1, characterized in that the large connecting rod eye (3) after screwing the connecting rod (5) and the connecting rod cover (6) is machined by spindles or rubbing.
EP03763716A 2002-07-16 2003-07-05 Method for the production of a connecting rod for a reciprocating piston engine Withdrawn EP1521662A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10232265 2002-07-16
DE10232265A DE10232265B3 (en) 2002-07-16 2002-07-16 Method of manufacturing a connecting rod of a reciprocating machine
PCT/EP2003/007218 WO2004007141A1 (en) 2002-07-16 2003-07-05 Method for the production of a connecting rod for a reciprocating piston engine

Publications (1)

Publication Number Publication Date
EP1521662A1 true EP1521662A1 (en) 2005-04-13

Family

ID=30010077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03763716A Withdrawn EP1521662A1 (en) 2002-07-16 2003-07-05 Method for the production of a connecting rod for a reciprocating piston engine

Country Status (4)

Country Link
US (2) US20050005443A1 (en)
EP (1) EP1521662A1 (en)
DE (1) DE10232265B3 (en)
WO (1) WO2004007141A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10232265B3 (en) * 2002-07-16 2004-02-26 Motorenfabrik Hatz Gmbh & Co Kg Method of manufacturing a connecting rod of a reciprocating machine
WO2006051822A1 (en) * 2004-11-09 2006-05-18 Honda Motor Co., Ltd. Device and method for inspecting connecting rod
DE102006030699B4 (en) * 2006-06-30 2014-10-02 Daimler Ag Cast steel piston for internal combustion engines
US20120102740A1 (en) * 2010-11-01 2012-05-03 Charles Preston Gros Hull floor support system
CN103702796B (en) * 2011-05-13 2016-10-12 Etxe-Tar有限公司 Lathe
DE102012111124B3 (en) * 2012-11-19 2013-12-05 Thyssenkrupp Presta Teccenter Ag Built crankshaft and method of making a built crankshaft
KR102121918B1 (en) * 2013-12-20 2020-06-11 삼성전자주식회사 Method and apparatus for event notification in home network system
CN107498191B (en) * 2017-09-29 2019-04-19 中车戚墅堰机车车辆工艺研究所有限公司 Fixture and forging part overlap processing method
CN107962361B (en) * 2017-12-13 2020-02-07 薛璐浩 Connecting rod tooth form and machining method thereof
CN110653566B (en) * 2019-09-27 2022-01-18 宜昌江峡船用机械有限责任公司 Method for preparing exciting beam of pavement crushing vehicle

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01104435A (en) * 1987-10-15 1989-04-21 Mazda Motor Corp Manufacture of aluminum parts
US4993134A (en) * 1988-05-17 1991-02-19 Ford Motor Company Making a fractured powder metal connecting rod
DE4007437A1 (en) * 1990-03-09 1991-09-12 Bayerische Motoren Werke Ag Finishing connecting or piston rod for IC engine - applying laser or water beam to separate formed pieces from press or mould strand
US5208979A (en) * 1991-09-19 1993-05-11 Howard Schmidt Prefracture laser formation of a stress riser groove
DE4306280A1 (en) * 1993-03-01 1994-09-08 Krebsoege Gmbh Sintermetall Method for producing a component with at least one divided running surface for rolling elements
DE19534360C2 (en) * 1995-02-06 1999-03-04 Mauser Werke Oberndorf Maschin Method and device for breaking connecting rods
DE19829147A1 (en) * 1998-06-30 2000-01-05 Volkswagen Ag Component and method for separating a component
US6134779A (en) * 1998-11-16 2000-10-24 Walker; Bruce K. High performance forged aluminum connecting rod and method of making the same
US6742253B2 (en) * 2001-06-29 2004-06-01 Gkn Sinter Metals Process for eliminating vertical flash on an as-forged connecting rod
DE10232265B3 (en) * 2002-07-16 2004-02-26 Motorenfabrik Hatz Gmbh & Co Kg Method of manufacturing a connecting rod of a reciprocating machine
US6915568B2 (en) * 2002-12-23 2005-07-12 Metaldyne Company Llc Method of manufacturing connecting rods

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004007141A1 *

Also Published As

Publication number Publication date
WO2004007141A1 (en) 2004-01-22
US20050015982A1 (en) 2005-01-27
US20050005443A1 (en) 2005-01-13
DE10232265B3 (en) 2004-02-26

Similar Documents

Publication Publication Date Title
EP1864740B1 (en) Method and device for generating a thread in at least two production steps
EP2213396A2 (en) Method and device for manufacturing a shaft
DE102009009019B3 (en) Method for producing a cylindrical hollow body with a small wall thickness, in particular a hollow shaft
DE10232265B3 (en) Method of manufacturing a connecting rod of a reciprocating machine
EP1137505A1 (en) Method and device for grinding workpieces with centers which comprise form variations
DE3415332A1 (en) METHOD FOR MANUFACTURING A SPACE TOOL
DE10327924B4 (en) Method for producing a bevel gear forged counter with a radius end mill and radius end mill
DE4116868C2 (en) Process for machining workpieces, in particular for EDM machining of workpieces using a wire
DE2839404C2 (en) Method for producing a cylinder serving to accommodate a piston of an internal combustion engine, in particular a two-stroke internal combustion engine
EP1385664B1 (en) Method and device for machining annular-shaped workpieces
DE10100668A1 (en) Method of manufacturing a ball joint housing
EP1375038B1 (en) Cut-off indexable insert
EP3085492B1 (en) Grinding tool
WO2011029944A1 (en) Machining unit, machine tool comprising said type of machining unit and method for rotationally working a rotating workpiece
DE19704131C2 (en) Fracture separation method and apparatus
EP1007860B1 (en) Bearing element for regulating devices in motor vehicles
EP3628426A1 (en) Method for cone-forming a bore with a fine boring tool
DD291259A5 (en) METHOD FOR PRODUCING RING-FORMED PARTS
EP1567299B1 (en) Tool for the cutting of threads
EP1870665A2 (en) Method and kit for gauging a thread in at least two production steps
DE102016110675B4 (en) Machining system, method for machining and manufacturing a workpiece and the use of a friction welding squeeze tool as a machining tool
DE3101123A1 (en) METHOD AND DEVICE FOR DEFORMING A METAL BAR INTO A TULIP-SHAPED PART BY FLOW-PRESSING IN A CLOSED CHAMBER
DE3314830C2 (en)
DE10107580B4 (en) Hob with means for clamping in a machine tool
DE3132860A1 (en) "METHOD FOR PRODUCING END MILLING AND MILLING MANUFACTURED"

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: 20040226

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20050401