EP2981383A1 - Machining process for trapezoid rings with small axial dimensions, used in pistons of internal combustion engines - Google Patents

Machining process for trapezoid rings with small axial dimensions, used in pistons of internal combustion engines

Info

Publication number
EP2981383A1
EP2981383A1 EP14707167.4A EP14707167A EP2981383A1 EP 2981383 A1 EP2981383 A1 EP 2981383A1 EP 14707167 A EP14707167 A EP 14707167A EP 2981383 A1 EP2981383 A1 EP 2981383A1
Authority
EP
European Patent Office
Prior art keywords
groove
trapezoidal
piston
machining
flanks
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Withdrawn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
EP14707167.4A
Other languages
German (de)
French (fr)
Inventor
Reiner Friede
Denis BELLER
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP2981383A1 publication Critical patent/EP2981383A1/en
Withdrawn legal-status Critical Current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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B1/00—Methods for turning or working essentially requiring the use of turning-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
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/06—Profile cutting tools, i.e. forming-tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F16J9/203—Oil-scraping rings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0485—Trapezium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/24—Components of internal combustion engines
    • B23B2215/245—Pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/24—Components of internal combustion engines
    • B23B2215/247—Piston rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2220/00—Details of turning, boring or drilling processes
    • B23B2220/12—Grooving

Definitions

  • the invention relates to a trapezoidal ring, the production of a groove for this trapezoidal ring in the piston and a composite of a piston with such a trapezoidal ring.
  • Trapezoidal rings for pistons which are inserted into corresponding grooves in the ring field of the piston, are known, for example from EP 0 398 993 B1 (DE 689 19 074 T2), DE 41 19 908 A1, DE 1 1 201 1 100 377 T5 DE 10 2007 057 840 A1, DE 196 16 474 A1, DE 30 345 19 C2 or DE 944 761.
  • the trapezoidal annular grooves disclosed in the aforementioned documents are not suitable for accommodating trapezoidal rings of axially small height, which leads to a larger expansion of the piston in the direction parallel to the piston stroke.
  • DE 43 41 386 C2 discloses a sealing unit for pistons of internal combustion engines with a arranged in the land of the piston annular groove with a conically shaped upper groove flank for receiving a trained with a corresponding flank piston ring.
  • the piston ring is located at the upper region of the piston facing the combustion chamber, which leads to increased wear of the piston ring.
  • a trapezoidal ring is provided, which has a trapezoidal cross-section and at the same time has a reduced overall height compared with known trapezoidal rings.
  • the maximum height of the trapezoidal ring pointing inwards in the direction of the piston stroke axis is less than or equal to 1 mm.
  • the trapezoidal annular groove is produced in two steps.
  • a tool steel which, viewed from the outside inwards in the direction of the piston stroke axis, has a trapezoidal profile and which has two flanks or surfaces aligned parallel to one another on the inwardly pointing end.
  • the groove is pre-punched and in a second step, the groove flanks are then finished, so that the correspondingly shaped trapezoidal and a low profile exhibiting ring can be inserted into this groove.
  • a trapezoidal ring is used with a correspondingly low height and such a piston can be installed in the cylinder of an internal combustion engine.
  • a method for producing a piston for internal combustion engines with a circumferential trapezoidal annular groove for receiving axially low trapezoidal rings, comprising a groove base with adjoining surfaces and groove flanks according to the invention is created in a first step of the groove base with the adjoining surfaces by machining with a tool steel and in a further process step, the groove flanks are created.
  • the machining of the annular groove takes place in such a way that the surfaces adjoining the groove base are parallel or nearly parallel to each other.
  • the tool life can be significantly increased and the inclusion of the trapezoidal ring to the groove base is thus guaranteed.
  • the machining of the annular groove takes place in such a way that the groove flanks are oriented trapezoidally relative to one another. Due to the funnel-shaped or trapezoidal arrangement of the groove flanks the inclusion of the trapezoidal ring is facilitated to the groove base.
  • the method is carried out such that the groove base after machining has a height of less than 2 mm, preferably less than 1, 5 mm, in particular less than 1 mm.
  • the trapezoidal annular groove can accommodate trapezoidal rings with a small axial extent. As a result, in turn, a low piston height can be realized.
  • the tool steel for carrying out a method is designed such that the tool steel has parallel or almost parallel surfaces at its end forming the subsequent groove bottom. As a result, a low overall height in the region of the groove base can be achieved with high tool life and the resulting low wear.
  • Tool steel is designed so that connect to the almost parallel surfaces of the piston stroke axis outwardly oriented trapezoidal surfaces.
  • the advantage is that in the first method step already the future position of the groove flanks is formed to each other. In a further method step, only the exact measure of the trapezoidal groove surfaces has to be worked out of one another.
  • FIG. 1 shows the schematic representation of a piston
  • FIG. 2 shows a detail of a ring field with a trapezoidal groove corresponding to the actual state
  • FIG. 3 shows a schematic sectional view of a tool steel according to the actual state
  • FIG. 4 shows a sectional view of a trapezoidal groove after the first processing step according to the invention
  • FIG. 5 shows a schematic sectional view of a tool steel for
  • FIG. 6 shows a schematic sectional view of a trapezoidal groove after carrying out the second processing step according to the invention.
  • FIGS 2 and 3 show the actual state and Figures 1, 4, 5 and 6 show the solution according to the invention.
  • top, bottom, left, right, front, back, etc. refer exclusively to the example representation and position of the device and other elements selected in the respective figures. These terms are not intended to be limiting, that is to say that different positions and / or mirror-symmetrical design or the like may change these references.
  • FIG. 1 shows a schematic view of a piston 1 with a trapezoidal radially encircling annular groove 2, the groove flanks 3, 4 and a Groove 5 has. Adjacent to the groove bottom 5 flanks 6, 7 are arranged which are oriented almost parallel to each other.
  • the annular groove 2 is part of a ring field 8, which has further differently configured annular grooves 9, 10 and 1 1.
  • the minimum height hi of the annular groove 2 in this example case is 1, 96 mm.
  • the ideal case shown there that the trapezoidal groove continues to converge further inward, for example, to a height h 2 of 0.17 mm, can not be represented in practice, as with tool steels 12 with a height h 3 less than or equal to 1 mm wear takes place.
  • This wear is due to the complete trapezoidal shape of the surfaces 13, 14 from outside to inside in the direction of the piston stroke axis (when viewed in Figure 3 of the tool steel 12 shown there from left to right).
  • a radius Ri of 0.3 is provided for the transition from the groove bottom 5 to the flanks 6, 7, for example.
  • the opening angle ⁇ is provided, for example, at 15 degrees and 12 minutes.
  • a groove 2 In contrast, according to the solution according to the invention (shown in FIG. 4), provision is made for a groove 2 to be initially punched.
  • a special tool steel 15 (shown in FIG. 5) is used with regard to its cross section.
  • the cross section runs initially from the outside in the direction inwards with trapezoidal surfaces 16, 17 and then runs in two parallel surfaces 18, 19 from.
  • the groove 2 With this cross section of the illustrated tool steel, the groove 2 is pre-pierced, so that a groove base 5 in the height h of at least one millimeter or even smaller can be realized.
  • a radius R2 of 0.2 is provided for the transition from the groove bottom 5 to the flanks 6, 7, for example.
  • the opening angle ⁇ is provided, for example, at 15 degrees and 12 minutes.
  • the groove flanks 3, 4 are finished, so that with a second, correspondingly shaped in cross-section Tool steel (not shown) not all the material from the piston blank must be worked out, but that only superficially a processing of the groove flanks 3, 4 takes place.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a method for producing a piston (1) for internal combustion engines, said piston comprising a circumferential trapezoid annular groove (2) for receiving trapezoid rings with small axial dimensions and the groove having a groove base (5) with adjoining surfaces (6, 7) and groove flanks (3, 4). According to the invention, the groove base (5) with adjoining surfaces (6, 7) is created in a first method step by machining using a cutting steel (15) and the groove flanks (3, 4) are created in a further method step. Also disclosed are a piston (1) produced according to the claimed method and a cutting steel (15).

Description

B E S C H R E I B U N G  DESCRIPTION
Bearbeitungsprozess für axial niedrige Trapezringe für Kolben von Brennkraftmaschinen Machining process for axially low trapezoidal rings for pistons of internal combustion engines
Die Erfindung betrifft einen Trapezring, die Herstellung einer Nut für diesen Trapezring im Kolben und einem Verbund aus einem Kolben mit einem solchen Trapezring. The invention relates to a trapezoidal ring, the production of a groove for this trapezoidal ring in the piston and a composite of a piston with such a trapezoidal ring.
Trapezringe für Kolben, die in entsprechende Nuten im Ringfeld des Kolbens eingesetzt werden, sind bekannt, beispielsweise aus der EP 0 398 993 B1 (DE 689 19 074 T2), der DE 41 19 908 A1 , der DE 1 1 201 1 100 377 T5, der DE 10 2007 057 840 A1 , der DE 196 16 474 A1 , der DE 30 345 19 C2 oder der DE 944 761 . Jedoch sind die in den zuvor genannten Schriften offenbarten trapezförmigen Ringnuten nicht zur Aufnahme von Trapezringen mit axial geringer Bauhöhe geeignet, was zu einer größeren Ausdehnung des Kolbens in Richtung parallel zur Kolbenhubhachse führt. Trapezoidal rings for pistons, which are inserted into corresponding grooves in the ring field of the piston, are known, for example from EP 0 398 993 B1 (DE 689 19 074 T2), DE 41 19 908 A1, DE 1 1 201 1 100 377 T5 DE 10 2007 057 840 A1, DE 196 16 474 A1, DE 30 345 19 C2 or DE 944 761. However, the trapezoidal annular grooves disclosed in the aforementioned documents are not suitable for accommodating trapezoidal rings of axially small height, which leads to a larger expansion of the piston in the direction parallel to the piston stroke.
Die DE 43 41 386 C2 offenbart eine Dichtungseinheit für Kolben von Brennkraftmaschinen mit einer im Feuersteg des Kolbens angeordneten Ringnut mit konisch ausgebildeter oberer Nutflanke zur Aufnahme eines mit korrespondierender Flanke ausgebildeten Kolbenringes. Hierbei liegt der Kolbenring am oberen dem Brennraum zugewandten Bereich des Kolbens, was zu einem erhöhten Verschleiß des Kolbenringes führt. DE 43 41 386 C2 discloses a sealing unit for pistons of internal combustion engines with a arranged in the land of the piston annular groove with a conically shaped upper groove flank for receiving a trained with a corresponding flank piston ring. Here, the piston ring is located at the upper region of the piston facing the combustion chamber, which leads to increased wear of the piston ring.
Aufgrund der bisher eingesetzten Bauhöhe von Trapezringen ist es vor allen Dingen unter Serienbedingungen problematisch, eine trapezförmige Nut, die von außen in Richtung der Kolbenhubachse in ihrer axialen Höhe abnimmt, herzustellen. Andererseits besteht aber das Erfordernis nach einer geringen Höhe von Trapezringen, um so die Kolbenhöhe zu verringern. Erfindungsgemäß ist daher ein Trapezring vorgesehen, der einen trapezförmigen Querschnitt aufweist und gleichzeitig gegenüber bekannten Trapezringen eine verringerte Bauhöhe aufweist. Vorzugsweise beträgt die in Richtung der Kolbenhubachse nach innen weisende maximale Höhe des Trapezringes kleiner gleich 1 mm. Solche Dimensionen lassen sich bei Serienherstellungen von trapezförmigen Ringnuten bisher nicht realisieren, da die hierfür erforderlichen Werkzeugstähle zur spanabhebenden Bearbeitung zur Realisierung der Ringnut ein inneres Maß von einer maximalen Höhe von 1 mm nicht zu lassen. Daher ist weiterhin vorgesehen, dass die trapezförmige Ringnut in zwei Schritten hergestellt wird. Zunächst wird ein Werkzeugstahl verwendet, der von außen nach innen in Richtung der Kolbenhubachse betrachtet einen trapezförmigen Verlauf aufweist und der an dem nach innenweisenden Ende zwei parallel zueinander ausgerichtete Flanken bzw. Flächen aufweist. Mit einem solchen Werkzeugstahl wird die Nut vorgestochen und in einem zweiten Schritt werden dann die Nutflanken fertig bearbeitet, so dass der entsprechend gestaltete trapezförmige und eine geringe Bauhöhe aufweisender Ring in diese Nut eingesetzt werden kann. Schließlich steht nach dieser Durchführung der fertige Kolben mit einer trapezförmigen Ringnut geringer Höhe zur Verfügung, in die ein Trapezring mit entsprechend geringer Bauhöhe eingesetzt ist und ein solcher Kolben in den Zylinder einer Brennkraftmaschine eingebaut werden kann. Due to the height of trapezoidal rings used hitherto, it is particularly problematic under series conditions to produce a trapezoidal groove which decreases in its axial height from the outside in the direction of the piston stroke axis. On the other hand, there is a need for a small height of trapezoidal rings, so as to reduce the piston height. According to the invention, therefore, a trapezoidal ring is provided, which has a trapezoidal cross-section and at the same time has a reduced overall height compared with known trapezoidal rings. Preferably, the maximum height of the trapezoidal ring pointing inwards in the direction of the piston stroke axis is less than or equal to 1 mm. Such dimensions can not be realized in series production of trapezoidal annular grooves, since the required tool steels for machining to realize the annular groove not to let an internal dimension of a maximum height of 1 mm. Therefore, it is further provided that the trapezoidal annular groove is produced in two steps. First, a tool steel is used which, viewed from the outside inwards in the direction of the piston stroke axis, has a trapezoidal profile and which has two flanks or surfaces aligned parallel to one another on the inwardly pointing end. With such a tool steel, the groove is pre-punched and in a second step, the groove flanks are then finished, so that the correspondingly shaped trapezoidal and a low profile exhibiting ring can be inserted into this groove. Finally, after this implementation of the finished piston with a trapezoidal annular groove of low height available, in which a trapezoidal ring is used with a correspondingly low height and such a piston can be installed in the cylinder of an internal combustion engine.
Verfahren zur Herstellung eines Kolbens für Brennkraftmaschinen mit einer umlaufenden trapezförmigen Ringnut zur Aufnahme von axial niedrigen Trapezringen, aufweisend einen Nutgrund mit daran anschließenden Flächen und Nutflanken erfindungsgemäß wird in einem ersten Verfahrensschritt der Nutgrund mit den daran anschließenden Flächen durch Bearbeitung mit einem Werkzeugstahl erstellt und in einem weiteren Verfahrensschritt werden die Nutflanken erstellt. Durch die Aufteilung der Herstellung einer trapezförmigen Nut in zwei Verfahrensschritte ist es möglich, einen Nutgrund mit geringer Bauhöhe zu erschaffen. A method for producing a piston for internal combustion engines with a circumferential trapezoidal annular groove for receiving axially low trapezoidal rings, comprising a groove base with adjoining surfaces and groove flanks according to the invention is created in a first step of the groove base with the adjoining surfaces by machining with a tool steel and in a further process step, the groove flanks are created. By dividing the production of a trapezoidal groove in two steps, it is possible to create a groove base with low height.
Vorgesehen ist weiterhin, dass die Bearbeitung der Ringnut, derart erfolgt, dass die sich an den Nutgrund anschließenden Flächen parallel oder nahezu parallel zueinander verlaufen. Hierdurch kann die Werkzeugstandzeit deutlich erhöht werden und die Aufnahme des Trapezringes bis in den Nutgrund wird somit gewährleistet. It is furthermore provided that the machining of the annular groove takes place in such a way that the surfaces adjoining the groove base are parallel or nearly parallel to each other. As a result, the tool life can be significantly increased and the inclusion of the trapezoidal ring to the groove base is thus guaranteed.
Auch ist angestrebt, dass die Bearbeitung der Ringnut derart erfolgt, dass die Nutflanken trapezförmig zueinander orientiert sind. Durch die trichterförmige bzw. trapezförmige Anordnung der Nutflanken ist die Aufnahme des Trapezringes bis in den Nutgrund erleichtert. It is also desirable that the machining of the annular groove takes place in such a way that the groove flanks are oriented trapezoidally relative to one another. Due to the funnel-shaped or trapezoidal arrangement of the groove flanks the inclusion of the trapezoidal ring is facilitated to the groove base.
Weiterhin ist vorgesehen, dass sich durch die Bearbeitung der Ringnut ein Übergangsbereich zwischen den Flächen und den Nutflanken ausbildet. Der Nutgrund ermöglicht die Aufnahme und Fixierung des Trapezringes an seiner der Kolbenhubachse zugewandten Seite. Furthermore, it is provided that forms a transition region between the surfaces and the groove flanks by the machining of the annular groove. The groove bottom allows the reception and fixation of the trapezoidal ring on its side facing the piston stroke axis.
Das Verfahren wird derart durchgeführt, dass der Nutgrund nach der Bearbeitung eine Bauhöhe von weniger als 2 mm bevorzugt weniger als 1 ,5 mm insbesondere weniger als 1 mm aufweist. Somit kann die trapezförmige Ringnut Trapezringe mit geringer axialer Ausdehnung aufnehmen. Dadurch ist wiederum eine geringe Kolbenbauhöhe realisierbar. The method is carried out such that the groove base after machining has a height of less than 2 mm, preferably less than 1, 5 mm, in particular less than 1 mm. Thus, the trapezoidal annular groove can accommodate trapezoidal rings with a small axial extent. As a result, in turn, a low piston height can be realized.
Der Werkzeugstahl zur Durchführung eines Verfahrens ist derart ausgebildet, dass der Werkzeugstahl an seinem den späteren Nutgrund ausbildenden Ende parallele oder nahezu parallele Flächen aufweist. Hierdurch kann eine geringe Bauhöhe im Bereich des Nutgrundes erzielt werden bei hohen Werkzeugstandzeiten und daraus resultierenden geringem Verschleiß. The tool steel for carrying out a method is designed such that the tool steel has parallel or almost parallel surfaces at its end forming the subsequent groove bottom. As a result, a low overall height in the region of the groove base can be achieved with high tool life and the resulting low wear.
Werkzeugstahl ist derart gestaltet, dass sich an die nahezu parallelen Flächen von der Kolbenhubachse nach außen orientierte trapezförmige Flächen anschließen. Vorteil ist, dass im ersten Verfahrensschritt schon die zukünftige Lage der Nutflanken zueinander ausgebildet wird. In einem weiteren Verfahrensschritt muss nur noch das genaue Maß der trapezförmigen Nutflächen zueinander herausgearbeitet werden. Tool steel is designed so that connect to the almost parallel surfaces of the piston stroke axis outwardly oriented trapezoidal surfaces. The advantage is that in the first method step already the future position of the groove flanks is formed to each other. In a further method step, only the exact measure of the trapezoidal groove surfaces has to be worked out of one another.
Die Erfindung wird anhand der nachfolgend beschriebenen Figuren weiter verdeutlicht. Figur 1 zeigt die schematische Darstellung eines Kolbens, The invention will be further clarified with reference to the figures described below. FIG. 1 shows the schematic representation of a piston,
Figur 2 zeigt einen Ausschnitt aus einem Ringfeld mit einer trapezförmigen Nut entsprechend dem Ist-Zustand, FIG. 2 shows a detail of a ring field with a trapezoidal groove corresponding to the actual state,
Figur 3 zeigt eine schematische Schnittansicht eines Werkzeugstahles entsprechend dem Ist-Zustand, FIG. 3 shows a schematic sectional view of a tool steel according to the actual state,
Figur 4 zeigt eine Schnittansicht einer trapezförmigen Nut nach dem ersten erfindungsgemäßen Bearbeitungsschritt, FIG. 4 shows a sectional view of a trapezoidal groove after the first processing step according to the invention,
Figur 5 zeigt eine schematische Schnittansicht eines Werkzeugstahls zur FIG. 5 shows a schematic sectional view of a tool steel for
Durchführung des erfindungsgemäßen Bearbeitungsprozesses und  Implementation of the machining process according to the invention and
Figur 6 zeigt eine schematische Schnittansicht einer trapezförmigen Nut nach der Durchführung des zweiten erfindungsgemäßen Bearbeitungsschrittes. FIG. 6 shows a schematic sectional view of a trapezoidal groove after carrying out the second processing step according to the invention.
Die Figuren 2 und 3 zeigen den Ist-Zustand und die Figuren 1 , 4, 5 und 6 zeigen die erfindungsgemäße Lösung. Figures 2 and 3 show the actual state and Figures 1, 4, 5 and 6 show the solution according to the invention.
Für gleiche Elemente werden für beide Ausführungsbeispiele gleiche Bezugszeichen vergeben.  For the same elements, the same reference numerals are given for both embodiments.
In der nachfolgenden Figurenbeschreibung beziehen sich Begriffe wie oben, unten, links, rechts, vorne, hinten usw. ausschließlich auf die in den jeweiligen Figuren gewählte beispielhafte Darstellung und Position der Einrichtung und anderer Elemente. Diese Begriffe sind nicht einschränkend zu verstehen, das heißt durch verschiedene Positionen und/oder spiegelsymmetrische Auslegung oder dergleichen können sich diese Bezüge ändern. In the following description of the figures, terms such as top, bottom, left, right, front, back, etc. refer exclusively to the example representation and position of the device and other elements selected in the respective figures. These terms are not intended to be limiting, that is to say that different positions and / or mirror-symmetrical design or the like may change these references.
Die Figur 1 zeigt eine schematische Ansicht eines Kolbens 1 mit einer trapezförmigen radial umlaufenden Ringnut 2 die Nutflanken 3, 4 sowie einen Nutgrund 5 aufweist. Benachbart zum Nutgrund 5 sind Flanken 6, 7 angeordnet die nahezu parallel zueinander orientiert sind. Die Ringnut 2 ist Teil eines Ringfeldes 8, welches weitere verschieden ausgestaltete Ringnuten 9, 10 und 1 1 aufweist. 1 shows a schematic view of a piston 1 with a trapezoidal radially encircling annular groove 2, the groove flanks 3, 4 and a Groove 5 has. Adjacent to the groove bottom 5 flanks 6, 7 are arranged which are oriented almost parallel to each other. The annular groove 2 is part of a ring field 8, which has further differently configured annular grooves 9, 10 and 1 1.
In der Figur 2 ist erkennbar, dass die minimale Bauhöhe hi der Ringnut 2 in diesem Beispielfall 1 ,96 mm beträgt. Der dort dargestellte Idealfall, dass die Trapeznut nach innen weisend noch weiter zusammenläuft, beispielsweise auf eine Bauhöhe h2 von 0,17 mm, lässt sich in der Praxis nicht darstellen, da mit Werkzeugstählen 12 mit einer Bauhöhe h3 kleiner gleich 1 mm ein Verschleiß stattfindet. Dieser Verschleiß ist bedingt durch den vollständigen trapezförmigen Verlauf der Flächen 13, 14 von außen nach innen in Richtung der Kolbenhubachse (bei Betrachtung der Figur 3 des dort dargestellten Werkzeugstahles 12 von links nach rechts). Das bedeutet, dass mit dieser Konstruktion, dem dort gezeigten Werkzeug 12 und dem Herstellungsverfahren Trapezringe geringer Höhe und Ringnuten 2, die trapezförmig ausgebildet sind, nicht mit der gewünschten geringen Bauhöhe eingesetzt werden können. Für den Übergang vom Nutgrund 5 zu den Flanken 6, 7 ist beispielsweise ein Radius Ri von 0,3 vorgesehen. Der Öffnungswinkel α ist beispielsweise mit 15 Grad und 12 Minuten vorgesehen. In the figure 2 it can be seen that the minimum height hi of the annular groove 2 in this example case is 1, 96 mm. The ideal case shown there that the trapezoidal groove continues to converge further inward, for example, to a height h 2 of 0.17 mm, can not be represented in practice, as with tool steels 12 with a height h 3 less than or equal to 1 mm wear takes place. This wear is due to the complete trapezoidal shape of the surfaces 13, 14 from outside to inside in the direction of the piston stroke axis (when viewed in Figure 3 of the tool steel 12 shown there from left to right). This means that with this construction, the tool 12 shown there and the manufacturing process low-height trapezoidal rings and annular grooves 2, which are trapezoidal, can not be used with the desired low height. For the transition from the groove bottom 5 to the flanks 6, 7, for example, a radius Ri of 0.3 is provided. The opening angle α is provided, for example, at 15 degrees and 12 minutes.
Im Gegensatz dazu ist gemäß der erfindungsgemäßen Lösung (in der Figur 4 dargestellt) vorgesehen, dass zunächst eine Nut 2 vorgestochen wird. Hierzu wird ein besonderer Werkzeugstahl 15 (gezeigt in der Figur 5) hinsichtlich seines Querschnittes verwendet. Der Querschnitt läuft zunächst von außen in die Richtung nach innen mit trapezförmigen Flächen 16, 17 zu und läuft dann in zwei parallel Flächen 18, 19 aus. Mit diesem Querschnitt des dargestellten Werkzeugstahles wird die Nut 2 vorgestochen, so dass sich ein Nutgrund 5 in der Bauhöhe h von mindestens einem Millimeter oder auch kleiner realisieren lässt. Für den Übergang vom Nutgrund 5 zu den Flanken 6, 7 ist beispielsweise ein Radius R2 von 0,2 vorgesehen. Der Öffnungswinkel α ist beispielsweise mit 15 Grad und 12 Minuten vorgesehen. In contrast, according to the solution according to the invention (shown in FIG. 4), provision is made for a groove 2 to be initially punched. For this purpose, a special tool steel 15 (shown in FIG. 5) is used with regard to its cross section. The cross section runs initially from the outside in the direction inwards with trapezoidal surfaces 16, 17 and then runs in two parallel surfaces 18, 19 from. With this cross section of the illustrated tool steel, the groove 2 is pre-pierced, so that a groove base 5 in the height h of at least one millimeter or even smaller can be realized. For the transition from the groove bottom 5 to the flanks 6, 7, for example, a radius R2 of 0.2 is provided. The opening angle α is provided, for example, at 15 degrees and 12 minutes.
In einem zweiten, in der Figur 6 dargestellten Schritt werden die Nutflanken 3, 4 fertig bearbeitet, so dass mit einem zweiten, entsprechend im Querschnitt geformten Werkzeugstahl (nicht dargestellt) nicht mehr das gesamte Material aus dem Kolbenrohling herausgearbeitet werden muss, sondern dass nur noch oberflächlich eine Bearbeitung der Nutflanken 3, 4 erfolgt. In a second step shown in FIG. 6, the groove flanks 3, 4 are finished, so that with a second, correspondingly shaped in cross-section Tool steel (not shown) not all the material from the piston blank must be worked out, but that only superficially a processing of the groove flanks 3, 4 takes place.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Kolben  1 piston
2 trapezförmige Ringnut 2 trapezoidal ring groove
3 Nutflanke 3 groove flank
4 Nutflanke  4 groove flank
5 Nutgrund  5 groove base
6 Flanke  6 flank
7 Flanke  7 flank
8 Ringfeld  8 ring field
9 Ringnut  9 ring groove
10 Ringnut  10 ring groove
1 1 Ringnut  1 1 ring groove
2 Werkzeugstahl 2 tool steel
13 Fläche 13 area
14 Fläche  14 area
5 Werkzeugstahl 5 tool steel
16 Fläche 16 area
17 Fläche  17 area
18 Fläche  18 area
19 Fläche hi Bauhöhe  19 area hi height
h2 Bauhöhe h 2 height
h3 Bauhöhe h 3 height
h4 Bauhöhe h 4 height
α Winkel  α angle
Ri Radius  Ri radius
R2 Radius R 2 radius

Claims

P A T E N T A N S P R Ü C H E Bearbeitungsprozess für axial niedrige Trapezringe für Kolben von Brennkraftmaschinen PATENT TASK Machining process for axially low trapezoidal rings for pistons of internal combustion engines
1 . Verfahren zur Herstellung eines Kolbens (1 ) für Brenn kraftmasch inen mit einer umlaufenden trapezförmigen Ringnut (2) zur Aufnahme von axial niedrigen Trapezringen, aufweisend einen Nutgrund (5) mit daran anschließenden Flächen (6, 7) und Nutflanken (3, 4) dadurch gekennzeichnet, dass in einem ersten Verfahrensschritt der Nutgrund (5) mit den daran anschließenden Flächen (6, 7) durch Bearbeitung mit einem Werkzeugstahl (15) erstellt wird und in einem weiteren Verfahrensschritt die Nutflanken (3, 4) erstellt werden. 1 . A method for producing a piston (1) for internal combustion engines with a circumferential trapezoidal annular groove (2) for receiving axially low trapezoidal rings, comprising a groove base (5) with adjoining surfaces (6, 7) and groove flanks (3, 4) characterized characterized in that in a first method step, the groove base (5) with the adjoining surfaces (6, 7) by machining with a tool steel (15) is created and in a further process step, the groove flanks (3, 4) are created.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Bearbeitung der Ringnut (2), derart erfolgt, dass die sich an den Nutgrund (5) anschließenden Flächen (6, 7) parallel oder nahezu parallel zueinander verlaufen. 2. The method according to claim 1, characterized in that the machining of the annular groove (2), takes place in such a way that the surfaces (6, 7) adjoining the groove base (5) run parallel or nearly parallel to one another.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Bearbeitung der Ringnut (2) derart erfolgt, dass die Nutflanken (3, 4) trapezförmig zueinander orientiert sind. 3. The method according to claim 1, characterized in that the machining of the annular groove (2) takes place such that the groove flanks (3, 4) are oriented trapezoidal to each other.
4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sich durch die Bearbeitung der Ringnut (2) ein Übergangsbereich zwischen den Flächen (6, 7) und den Nutflanken (3, 4) ausbildet. 4. The method according to any one of the preceding claims, characterized in that by the machining of the annular groove (2), a transition region between the surfaces (6, 7) and the groove flanks (3, 4) is formed.
5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Nutgrund (5) nach der Bearbeitung eine Bauhöhe h von weniger als 2 mm bevorzugt weniger als 1 ,5 mm insbesondere weniger als 1 mm aufweist. 5. The method according to any one of the preceding claims, characterized in that the groove base (5) after processing has a height h of less than 2 mm, preferably less than 1, 5 mm, in particular less than 1 mm.
6. Werkzeugstahl (15) zur Durchführung eines Verfahrens gemäß Anspruch 1 , dadurch gekennzeichnet, dass der Werkzeugstahl (15) an seinem den späteren Nutgrund (5) ausbildenden Ende parallele oder nahezu parallele Flächen (18, 19) aufweist. 6. tool steel (15) for performing a method according to claim 1, characterized in that the tool steel (15) at its later Groove base (5) forming end parallel or nearly parallel surfaces (18, 19).
7. Werkzeugstahl (15) nach Anspruch 6, dadurch gekennzeichnet, dass sich an die nahezu parallelen Flächen (18, 19) von der Kolbenhubachse nach außen orientierte trapezförmige Flächen (16, 17) anschließen. 7. tool steel (15) according to claim 6, characterized in that adjoin the almost parallel surfaces (18, 19) of the Kolbenhubachse outwardly oriented trapezoidal surfaces (16, 17).
8. Trapezring, dadurch gekennzeichnet, dass er zur Aufnahme in eine trapezförmige Ringnut (2) hergestellt nach einem Verfahren gemäß der Ansprüche 1 bis 5 geeignet ist. 8. trapezoidal ring, characterized in that it is suitable for receiving in a trapezoidal annular groove (2) prepared by a method according to the claims 1 to 5 is suitable.
9. Kolben (1 ) dadurch gekennzeichnet, dass er nach einem Verfahren gemäß der Ansprüche 1 bis 5 hergestellt ist. 9. piston (1), characterized in that it is prepared by a method according to claims 1 to 5.
10. Kolben (1 ) dadurch gekennzeichnet, dass er mindestens einen Trapezring gemäß Anspruch 8 aufweist. 10. piston (1) characterized in that it comprises at least one trapezoidal ring according to claim 8.
EP14707167.4A 2013-04-03 2014-02-28 Machining process for trapezoid rings with small axial dimensions, used in pistons of internal combustion engines Withdrawn EP2981383A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013205879 2013-04-03
DE102013221395.6A DE102013221395A1 (en) 2013-04-03 2013-10-22 Machining process for axially low trapezoidal rings for pistons of internal combustion engines
PCT/EP2014/053918 WO2014161696A1 (en) 2013-04-03 2014-02-28 Machining process for trapezoid rings with small axial dimensions, used in pistons of internal combustion engines

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EP (1) EP2981383A1 (en)
CN (1) CN105377482B (en)
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MX366438B (en) 2019-07-09
US10197161B2 (en) 2019-02-05
BR112015024586A2 (en) 2017-07-18
CN105377482B (en) 2018-05-22
MX2015013680A (en) 2016-06-30
CN105377482A (en) 2016-03-02
DE102013221395A1 (en) 2014-10-09
US20160025219A1 (en) 2016-01-28

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