EP2743030A2 - Method and device for producing a workpiece with at least one step - Google Patents

Method and device for producing a workpiece with at least one step Download PDF

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Publication number
EP2743030A2
EP2743030A2 EP13005787.0A EP13005787A EP2743030A2 EP 2743030 A2 EP2743030 A2 EP 2743030A2 EP 13005787 A EP13005787 A EP 13005787A EP 2743030 A2 EP2743030 A2 EP 2743030A2
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EP
European Patent Office
Prior art keywords
grinding
workpiece
space
elements
wheels
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.)
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Application number
EP13005787.0A
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German (de)
French (fr)
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EP2743030A3 (en
Inventor
Klaus-Dieter Monning
Ralf Hug
Alexander Hofsess
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Diskus Werke Schleiftechnik GmbH
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Diskus Werke Schleiftechnik GmbH
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Priority claimed from DE201220011897 external-priority patent/DE202012011897U1/en
Priority claimed from DE201210024248 external-priority patent/DE102012024248A1/en
Application filed by Diskus Werke Schleiftechnik GmbH filed Critical Diskus Werke Schleiftechnik GmbH
Publication of EP2743030A2 publication Critical patent/EP2743030A2/en
Publication of EP2743030A3 publication Critical patent/EP2743030A3/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10Single-purpose machines or devices
    • B24B7/16Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0069Other grinding machines or devices with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0076Other grinding machines or devices grinding machines comprising two or more grinding tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/06Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving conveyor belts, a sequence of travelling work-tables or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24DTOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental

Definitions

  • the invention relates to a method for producing a workpiece having at least one step, in particular a connecting rod having at least one step according to the preamble of claim 1, and to a device suitable in particular for carrying out the method according to the preamble of claim 4.
  • Connecting rods are components of reciprocating engines and the link between the reciprocating piston and the crankshaft of this engine. They have two holes with parallel frontal ring surfaces, the large bore for supporting the connecting rod on the crankshaft and the smaller bore for storing the same serves in the piston. In so-called arguenpleuel the frontal ring surfaces have different distances, the connecting rods are so different in the area of these holes. To produce such a stepped connecting rod this is usually forged and goes through the forging process several processing steps: a first pre-grinding for the production of clamping surfaces for the following processing steps is followed by a final grinding after the last processing. The level of the connecting rod is generated in a separate processing step by a milling or grinding operation, in both cases a separate device is used.
  • the blanks of such horrinpleuel are usually provided as forgings or castings or manufactured as a powder metallurgy sintered workpieces.
  • the blanks are either made equally thick with equal dimensions on both eyes or already stepped as a blank for further processing.
  • the blanks of the stepped connecting rods are pre-ground to the same thickness.
  • Several further work steps are carried out up to the finish grinding process, after which the step of the stepped connecting rod is then finish milled or ground.
  • the stage In the second case, the stage must be observed during the pre-grinding process. This requires that all subsequent processing steps must be performed on stepped devices, which is disadvantageously reflected in higher device and tooling costs.
  • a stepped grinding space makes it possible in an advantageous manner to machine a workpiece having a step, in particular a stepped connecting rod, with a single device. It is therefore no longer necessary to change between a device for double-side plan grinding and a further device for generating the at least one stage. This advantageously reduces the machine construction and thus investment costs and also leads to lower tool costs.
  • the inventively provided use of multiple grinding elements has the advantage that in this way the specifications of the individual grinding elements can be easily adapted to the different machine and procedural requirements that occur in the overall grinding process of a workpiece. Since in the apparatus according to the invention and the method according to the invention, no change of the grinding tools for different grinding tasks is required, the measures according to the invention advantageously produce an increase in the production rate.
  • the rough cutting for the step to be introduced into the workpiece can be done by a designed for it Grinding element can be performed, just as the grinding elements performing further grinding operations can be adapted to their processing purpose accordingly.
  • the machine parameters such as cutting speed and infeed speed can also be adapted, so that an improved adaptation of the grinding wheels formed by the grinding elements to the respective grinding operation is made possible by the use of a plurality of grinding elements.
  • An advantageous development of the invention provides that several workpieces are introduced simultaneously into the grinding room. Such a measure results in an advantageous manner in a further increase in the production rate.
  • Such a device has two plane-parallel grinding wheels 1, 1 ', which are movable relative to one another by adjusting devices, not shown in the figures, so that the height of the grinding space 10 delimited by the two grinding wheels 1, 1' is variable by a corresponding adjusting movement of the adjusting devices.
  • the device furthermore has a workpiece transport device, likewise not shown in the figures, through which the workpieces W1, W2, W3 to be machined by the two grinding wheels 1, 1 'can be introduced into the grinding space 10 of the device.
  • the workpieces W1, W2, W3 preground in this way for the production of one step are then further introduced into the grinding space 10 in the radial direction by the workpiece transport device, until - as seen in FIG FIG. 3 the first ends W1 ', W2', W3 'of the workpieces W1, W2, W3 are in the effective range of the grinding elements 1c and 1c' of the grinding wheels 1 and 1 'and their second ends W1 "or W2" or W3
  • the thickness of the grinding elements 1 c, 1 c 'and thus the height of the limited by this Operaschleifraums 10 c of the grinding chamber 10 is selected such that it is the In a corresponding manner, the thickness of the grinding elements 1b, 1b 'of the two grinding wheels 1, 1' is tuned such that the height of the grinding wheels 1, 1 ', W2', W3 'corresponds to the workpieces W1, W2, W3 by the grinding surfaces 3 of these two grinding elements 1b, 1 b 'limited
  • the grinding space 10 defined by the grinding surfaces 3 of the grinding elements 1a-1c, 1a'-1c 'of the grinding wheels 1, 1' thus has a graduated course.
  • This advantageously makes it possible to machine a workpiece with one step, in particular a step connecting rod, with a single device. In an advantageous manner, therefore, no change between the double-side plan grinder and a further device for generating the at least one stage is required. This advantageously reduces the machine outlay and thus the investment costs and also leads to lower tool costs.
  • Another advantage of the procedure described is that hereby low cycle times and thus a high production rate can be achieved since a change between two processing devices, which implies a transfer of the workpieces from one to the other device, may be omitted.
  • the first processing step described above namely the generation of a step by introducing the first ends W1 ', W2', W3 'between the two grinding elements 1a, 1a'
  • the blanks are then-as described above-introduced immediately between the grinding elements 1b, 1 b 'and 1 c, 1c' and ground as above.
  • the described method and apparatus is not limited to the case of a single stage workpiece. Rather, it is in the corresponding embodiment of the grinding wheels 1, 1 'also possible to provide several stages in one and the same workpiece by grinding wheels 1, 1' with a number of grinding elements 1 a, 1 c, 1 a ', 1 c' with corresponding Gradation used to form at least one additional part grinding space.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

The apparatus has grinding discs (1) which are arranged opposingly with respect to each other. The stage connecting rods (W1-W3) are accommodated in grinding chamber. The grinding discs are provided with grinding elements (1b,1c). The thickness of grinding elements (1c) is set different from thickness of grinding elements (1b) such that grinding elements having stepped height is formed in grinding chambers.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines mindestens eine Stufe aufweisenden Werkstücks, insbesondere eines mindestens eine Stufe aufweisenden Pleuels gemäß den Oberbegriff des Anspruchs 1, sowie eine insbesondere zur Durchführung des Verfahrens geeignete Vorrichtung gemäß dem Oberbegriff des Anspruchs 4.The invention relates to a method for producing a workpiece having at least one step, in particular a connecting rod having at least one step according to the preamble of claim 1, and to a device suitable in particular for carrying out the method according to the preamble of claim 4.

Pleuel sind Bestandteile von Hubkolbenmotoren und das Bindeglied zwischen dem Hubkolben und der Kurbelwelle dieses Motors. Sie weisen zwei Bohrungen mit parallelen stirnseitigen Ringflächen auf, wobei die große Bohrung zur Lagerung des Pleuels auf der Kurbelwelle und die kleinere Bohrung zur Lagerung desselben im Kolben dient. Bei so genannten Stufenpleuel haben die stirnseitigen Ringflächen unterschiedliche Abstände, die Pleuel sind damit im Bereicht dieser Bohrungen unterschiedlich dick. Zur Herstellung eines derartigen Stufenpleuels wird dieses in der Regel geschmiedet und durchläuft nach dem Schmiedevorgang mehrere Bearbeitungsschritte: Einem ersten Vorschleifen zur Erzeugung von Aufspannflächen für die folgenden Bearbeitungsschritte folgt nach der letzten Bearbeitung ein Fertigschleifen. Die Stufe des Pleuels wird in einem eigenen Bearbeitungsschritt durch eine Fräs- oder Schleifoperation erzeugt, wobei in beiden Fällen eine separate Vorrichtung eingesetzt wird. Eine derartige Vorgehensweise besitzt nicht nur den Nachteil, dass hierzu eine weitere Vorrichtung für das Schleifen oder Fräsen der Stufe des Pleuels erforderlich ist, was zu höheren Investitions- und Werkzeugkosten führt. Ein weiterer Nachteil der bekannten Vorgangsweise ist, dass Ungenauigkeiten bei der Herstellung der Stufe durch ein erstmaliges Spannen zum einseitigen Fräsen oder auch Schleifen in einer Spannvorrichtung oder auf Magnetplatten auftreten können, insbesondere wenn sich ein Wenden und nochmaliges Spannen und/oder ein weiterer Bearbeitungsprozess dann anschließt. Die dabei entstehenden Dicketoleranzen sind insbesondere bei der Fertigbearbeitung des Werkstücks nachteilig, da bei einer Ungenauigkeit der Stufe die Mittelachse des Pleuels nicht parallel zur Spannvorrichtung liegt und somit die bei der Fertigbohrung einzuhaltenden Winkel-Toleranzen zu den Planflächen nicht gewährleistet sind.Connecting rods are components of reciprocating engines and the link between the reciprocating piston and the crankshaft of this engine. They have two holes with parallel frontal ring surfaces, the large bore for supporting the connecting rod on the crankshaft and the smaller bore for storing the same serves in the piston. In so-called Stufenpleuel the frontal ring surfaces have different distances, the connecting rods are so different in the area of these holes. To produce such a stepped connecting rod this is usually forged and goes through the forging process several processing steps: a first pre-grinding for the production of clamping surfaces for the following processing steps is followed by a final grinding after the last processing. The level of the connecting rod is generated in a separate processing step by a milling or grinding operation, in both cases a separate device is used. Such a procedure not only has the disadvantage that for this purpose a further device for grinding or milling the stage of the connecting rod is required, which leads to higher investment and tooling costs. Another disadvantage of the known procedure is that inaccuracies in the production of the stage by a first-time clamping for one-sided milling or loops in a jig or on magnetic disks may occur, especially when a turning and re-tightening and / or another processing process then followed , The resulting thickness tolerances are particularly disadvantageous in the finishing of the workpiece, as with an inaccuracy of the stage, the central axis of the connecting rod is not parallel to the jig and thus the to be complied with the finished bore angle tolerances to the flat surfaces are not guaranteed.

Die Rohteile derartiger Stufenpleuel werden üblicherweise als Schmiede- oder Gussteile bereitgestellt oder als pulvermetallurgische Sinter-Werkstücke gefertigt. Die Rohteile werden entweder gleich dick mit gleichen Ausmaßen an beiden Augen oder bereits als Rohling für die weitere Bearbeitung gestuft gefertigt. Im ersteren Fall werden die Rohlinge der Stufenpleuel gleich dick vorgeschliffen. Dann erfolgen mehrere weitere Arbeitsschritte bis zum Fertigschleif-Prozess, nach dem dann die Stufe des Stufenpleuels fertig gefräst oder geschliffen ist. Im zweiten Fall muss die Stufe schon beim Vorschleifprozess mitbeachtet werden. Dies bedingt, dass alle nachfolgenden Bearbeitungsschritte auf gestuften Vorrichtungen durchgeführt werden müssen, was sich in nachteiliger Weise in höheren Vorrichtungsund Werkzeugkosten niederschlägt.The blanks of such Stufenpleuel are usually provided as forgings or castings or manufactured as a powder metallurgy sintered workpieces. The blanks are either made equally thick with equal dimensions on both eyes or already stepped as a blank for further processing. In the former case, the blanks of the stepped connecting rods are pre-ground to the same thickness. Then Several further work steps are carried out up to the finish grinding process, after which the step of the stepped connecting rod is then finish milled or ground. In the second case, the stage must be observed during the pre-grinding process. This requires that all subsequent processing steps must be performed on stepped devices, which is disadvantageously reflected in higher device and tooling costs.

Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung der eingangs genannten Art derart weiterzubilden, dass ein mindestens eine Stufe aufweisendes Werkstück, insbesondere ein Stufenpleuel, mit geringeren Fertigungskosten herstellbar ist.It is an object of the present invention to develop a method and a device of the aforementioned type such that a workpiece having at least one step, in particular a stepped connecting rod, can be produced at lower production costs.

Diese Aufgabe wird durch ein Verfahren gemäß den Merkmalen des Anspruchs 1 und durch eine Vorrichtung gemäß den Merkmalen des Anspruchs 6 gelöst.This object is achieved by a method according to the features of claim 1 and by a device according to the features of claim 6.

Durch die Verwendung eines abgestuften Schleifraums wird es in vorteilhafter Art und Weise ermöglicht, ein eine Stufe aufweisendes Werkstück, insbesondere ein Stufenpleuel, mit einer einzigen Vorrichtung zu bearbeiten. Es ist daher kein Wechsel mehr zwischen einer Vorrichtung zum Doppel-Seiten-Plan-Schleifen und einer weiteren Vorrichtung zur Erzeugung der mindestens eine Stufe erforderlich. Dies reduziert in vorteilhafter Art und Weise den Maschinenaufbau und damit Investitionskosten und führt auch zu niedrigeren Werkzeugkosten. Die erfindungsgemäß vorgesehene Verwendung mehrerer Schleifelemente besitzt bei dem Vorteil, dass hierdurch die Spezifikationen der einzelnen Schleifelemente leicht den unterschiedlichen maschinen- und verfahrenstechnischen Anforderungen, die beim Gesamt-Schleifvorgang eines Werkstücks auftreten, angepasst werden können. Da bei der erfindungsgemäßen Vorrichtung und dem erfindungsgemäßen Verfahren kein Wechsel der Schleifwerkzeuge für unterschiedliche Schleifaufgaben mehr erforderlich ist, bewirken die erfindungsgemäßen Maßnahmen in vorteilhafter Art und Weise eine Erhöhung der Produktionsrate. Die Grobzerspanung für die in das Werkstück einzubringende Stufe kann von einem dafür ausgelegten Schleifelement durchgeführt werden, genau so wie die die weiteren Schleifoperationen durchführenden Schleifelemente an ihren Bearbeitungszweck entsprechend angepasst werden können. In vorteilhafter Art und Weise können auch die Maschinenparameter wie Schnitt- und Zustellgeschwindigkeit angepasst werden, so dass durch die Verwendung mehrerer Schleifelemente eine verbesserte Anpassung der durch die Schleifelemente ausgebildeten Schleifscheiben an den jeweiligen Schleifvorgang ermöglicht wird.The use of a stepped grinding space makes it possible in an advantageous manner to machine a workpiece having a step, in particular a stepped connecting rod, with a single device. It is therefore no longer necessary to change between a device for double-side plan grinding and a further device for generating the at least one stage. This advantageously reduces the machine construction and thus investment costs and also leads to lower tool costs. The inventively provided use of multiple grinding elements has the advantage that in this way the specifications of the individual grinding elements can be easily adapted to the different machine and procedural requirements that occur in the overall grinding process of a workpiece. Since in the apparatus according to the invention and the method according to the invention, no change of the grinding tools for different grinding tasks is required, the measures according to the invention advantageously produce an increase in the production rate. The rough cutting for the step to be introduced into the workpiece can be done by a designed for it Grinding element can be performed, just as the grinding elements performing further grinding operations can be adapted to their processing purpose accordingly. In an advantageous manner, the machine parameters such as cutting speed and infeed speed can also be adapted, so that an improved adaptation of the grinding wheels formed by the grinding elements to the respective grinding operation is made possible by the use of a plurality of grinding elements.

Eine vorteilhafte Weiterbildung der Erfindung sieht vor, dass mehrere Werkstücke gleichzeitig in den Schleifraum eingebracht werden. Eine derartige Maßnahme resultiert in vorteilhafter Art und Weise in einer weiteren Erhöhung der Produktionsrate.An advantageous development of the invention provides that several workpieces are introduced simultaneously into the grinding room. Such a measure results in an advantageous manner in a further increase in the production rate.

Weitere vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Further advantageous developments of the invention are the subject of the dependent claims.

Weitere Einzelheiten und Vorteile der Erfindung sind dem Ausführungsbeispiel zu entnehmen, das im folgenden anhand der Figuren beschrieben wird. Es zeigen:

Figur 1:
eine schematische Darstellung einer Schleifscheibe eines Ausführungsbeispiels einer Vorrichtung zusammen mit zwei Werkstücken W1, W2,
Figur 2:
ein Schnitt entlang der Linie II-II der Figur 1, und
Figur 3:
eine dem Schnitt der Figur 2 entsprechende Ansicht der Vorrichtung in einem darauf folgenden Verfahrensschritt.
Further details and advantages of the invention can be taken from the exemplary embodiment, which will be described below with reference to the figures. Show it:
FIG. 1:
1 is a schematic representation of a grinding wheel of an embodiment of a device together with two workpieces W1, W2,
FIG. 2:
a section along the line II-II of FIG. 1 , and
FIG. 3:
a the cut the FIG. 2 corresponding view of the device in a subsequent process step.

Das beschriebene Verfahren wird mit einer Doppel-Plan-Seitenschleifmaschine ausgeführt, wie sie z. B. im deutschen Patent DE 10 2006 009 938 B4 der Anmelderin beschrieben ist. Eine derartige Vorrichtung weist zwei planparallele Schleifscheiben 1, 1' auf, welche von in den Figuren nicht gezeigten Verstelleinrichtungen relativ zu einander beweglich sind, so dass durch eine entsprechende Verstellbewegung der Verstelleinrichtungen die Höhe des durch die beiden Schleifscheiben 1, 1' begrenzten Schleifraums 10 veränderlich ist. Die Vorrichtung weist des weiteren einen in den Figuren ebenfalls nicht gezeigte Werkstücktransporteinrichtung auf, durch welche die von den beiden Schleifscheiben 1, 1' zu bearbeitenden Werkstücke W1, W2, W3 in den Schleifraum 10 der Vorrichtung einbringbar sind. Wegen weiterer Einzelheiten des Aufbaus einer derartigen Vorrichtung wird auf die vorstehend genannte Patentschrift hingewiesen, deren Offenbarung durch diese Bezugnahme explizit zum Gegenstand dieser Anmeldung gemacht wird.The method described is carried out with a double-plan side grinder, as z. B. in the German patent DE 10 2006 009 938 B4 the applicant is described. Such a device has two plane-parallel grinding wheels 1, 1 ', which are movable relative to one another by adjusting devices, not shown in the figures, so that the height of the grinding space 10 delimited by the two grinding wheels 1, 1' is variable by a corresponding adjusting movement of the adjusting devices. The device furthermore has a workpiece transport device, likewise not shown in the figures, through which the workpieces W1, W2, W3 to be machined by the two grinding wheels 1, 1 'can be introduced into the grinding space 10 of the device. For further details of the construction of such a device, reference is made to the aforementioned patent, the disclosure of which is explicitly made the subject of this application by this reference.

Der wesentliche Unterschied zwischen der bekannten Doppel-Seiten-Plan-Schleifmaschine gemäß der DE 10 2006 009 938 B4 und der beschriebenen Vorrichtung besteht darin, dass bei der letztgenannten Maschine Schleifscheiben 1, 1' verwendet werden, die mehrere Schleifelemente 1a-1c und 1a'-1c' aufweisen, welche - wie nachstehend beschrieben - eine unterschiedliche Dicke besitzen, so dass der durch die beiden Schleifscheiben 1 und 1' begrenzte Schleifraum 10 in radialer Richtung nicht durchgehend die gleiche Höhe besitzt, sondern einen abgestuften Verlauf aufweist.The main difference between the known double-side plan grinder according to the DE 10 2006 009 938 B4 and the device described is that in the latter machine grinding wheels 1, 1 'are used, which have a plurality of grinding elements 1a-1c and 1a'-1c', which - as described below - have a different thickness, so that through both grinding wheels 1 and 1 'limited grinding space 10 in the radial direction not continuously has the same height, but has a stepped course.

Zur Herstellung jeweils mindestens eine Stufe aufweisender Werkstücke W1, W2, W3, im hier beschrieben Fall von drei jeweils eine Stufe aufweisenden Stufenpleuel, werden in dem in den Figuren 1 und 2 dargestellten ersten Bearbeitungsschritt die Werkstücke W1, W2, W3 mit ihrem ersten Ende W1', W2', W3' in radialer Richtung in den Schleifraum 10 eingebracht, so dass ihre ersten Enden W1', W2', W3' zwischen den Schleifelementen 1 a, 1 a' der beiden Schleifscheiben, 1, 1' und somit im Teil-Schleifraum 10a des Schleifraums 10 liegen. Durch die Beaufschlagung der Werkstücke W1, W2, W3 durch die Schleifelemente 1a, 1a' der beiden Schleifscheiben 1, 1' wird in einfacher Art und Weise eine Stufe, im Fall eines Stufenpleuels die Stufe am dünneren Auge dieses Pleuels, erzeugt. Die Werkstücke W1-W3 werden dabei gleichförmig geradlinig - wie durch die Bahn 5 angedeutet - oder auf einer kreisförmigen oder gekrümmten Bahn bewegt, wobei die Werkstückbewegung gleichförmig oder oszillierend sein kann.For producing in each case at least one stage exhibiting workpieces W1, W2, W3, in the case described here of three each having a step Stufenpleuel be in the in the FIGS. 1 and 2 illustrated first work step the workpieces W1, W2, W3 introduced with their first end W1 ', W2', W3 'in the radial direction in the grinding space 10 so that their first ends W1', W2 ', W3' between the grinding elements 1 a, 1 a 'of the two grinding wheels, 1, 1' and thus in the partial grinding space 10 a of the grinding space 10. By applying the workpieces W1, W2, W3 through the grinding elements 1a, 1a 'of the two grinding wheels 1, 1' is a step in a simple manner, in the case of a Stufenpleuels the stage on the thinner eye of this connecting rod generated. The Workpieces W1-W3 are uniformly rectilinear - as indicated by the web 5 - or moved on a circular or curved path, wherein the workpiece movement may be uniform or oscillating.

Nach Beendigung dieses Schleifvorgangs werden dann die derart zur Erzeugung jeweils einer Stufe vorgeschliffenen Werkstücke W1, W2, W3 von der Werkstücktransporteinrichtung weiter in radialer Richtung in den Schleifraum 10 eingebracht, bis - wie aus Figur 3 ersichtlich - die ersten Enden W1', W2', W3' der Werkstücke W1, W2, W3 sich im Wirkbereich der Schleifelemente 1c bzw. 1c' der Schleifscheiben 1 bzw. 1' und ihre zweiten Enden W1" bzw. W2" bzw. W3" sich im Wirkbereich der Schleifelemente 1 b, 1 b' der Schleifscheiben 1, 1' befinden. Die Dicke der Schleifelemente 1 c, 1c'und somit die Höhe des durch diese begrenzten Teilschleifraums 10c des Schleifraums 10 ist dabei derart gewählt, dass diese dem Endmaß des ersten Endes W1', W2', W3' der Werkstücke W1, W2, W3 entspricht. In entsprechender Art und Weise ist die Dicke der Schleifelemente 1b, 1 b' der beiden Schleifscheiben 1, 1' derart abgestimmt, dass die Höhe des durch die Schleifflächen 3 dieser beiden Schleifelemente 1b, 1 b' begrenzten TeilSchleifraums 10b dem Endmaß des zweiten Endes W1", W2", W3" der Werkstücke W1, W2, W3 entspricht.After completion of this grinding process, the workpieces W1, W2, W3 preground in this way for the production of one step are then further introduced into the grinding space 10 in the radial direction by the workpiece transport device, until - as seen in FIG FIG. 3 the first ends W1 ', W2', W3 'of the workpieces W1, W2, W3 are in the effective range of the grinding elements 1c and 1c' of the grinding wheels 1 and 1 'and their second ends W1 "or W2" or W3 The thickness of the grinding elements 1 c, 1 c 'and thus the height of the limited by this Teilschleifraums 10 c of the grinding chamber 10 is selected such that it is the In a corresponding manner, the thickness of the grinding elements 1b, 1b 'of the two grinding wheels 1, 1' is tuned such that the height of the grinding wheels 1, 1 ', W2', W3 'corresponds to the workpieces W1, W2, W3 by the grinding surfaces 3 of these two grinding elements 1b, 1 b 'limited TeilSchleifraums 10b the final dimension of the second end W1 ", W2", W3 "of the workpieces W1, W2, W3 corresponds.

Der durch die Schleifflächen 3 der Schleifelemente 1a-1c, 1a'-1c' der Schleifscheiben 1, 1' definierte Schleifraum 10 weist somit einen abgestuften Verlauf auf. Dies erlaubt in vorteilhafter Art und Weise, ein Werkstück mit einer Stufe, insbesondere ein Stufenpleuel, mit einer einzigen Vorrichtung zu bearbeiten. In vorteilhafter Art und Weise ist daher kein Wechsel zwischen der Doppel-Seiten-Plan-Schleifmaschine und einer weiteren Vorrichtung zur Erzeugung der mindestens eine Stufe erforderlich. Dies reduziert in vorteilhafter Art und Weise den Maschinenaufwand und somit die Investitionskosten und führt auch zu niedrigeren Werkzeugkosten. Ein weiterer Vorteil der beschriebenen Vorgangsweise ist, dass hiermit niedrige Taktzeiten und somit eine hohe Produktionsrate erzielbar sind, da ein Wechsel zwischen zwei Bearbeitungsvorrichtungen, welcher einen Transfer der Werkstücke von der einen zur anderen Vorrichtung impliziert, entfallen kann.The grinding space 10 defined by the grinding surfaces 3 of the grinding elements 1a-1c, 1a'-1c 'of the grinding wheels 1, 1' thus has a graduated course. This advantageously makes it possible to machine a workpiece with one step, in particular a step connecting rod, with a single device. In an advantageous manner, therefore, no change between the double-side plan grinder and a further device for generating the at least one stage is required. This advantageously reduces the machine outlay and thus the investment costs and also leads to lower tool costs. Another advantage of the procedure described is that hereby low cycle times and thus a high production rate can be achieved since a change between two processing devices, which implies a transfer of the workpieces from one to the other device, may be omitted.

Sollen mit der Vorrichtung bereits gestufte Werkstück-Rohlinge bearbeitet werden, so kann der vorstehend beschriebene erste Bearbeitungsschritt, nämlich das Erzeugen einer Stufe durch Einbringung der ersten Enden W1', W2', W3' zwischen die beiden Schleifelemente 1a, 1a' entfallen. Die Rohlinge werden dann-wie oben beschrieben - gleich zwischen die Schleifelemente 1b, 1 b' und 1 c, 1c' eingebracht und wie vorstehend geschliffen. In einem derartigen Fall ist nicht erforderlich, dass die beiden zum Planschleifen der Werkstücke W1, W2, W3 verwendeten Schleifscheiben 1,1' drei gestufte Schleifelemente 1a-1c, 1a'-1c' aufweisen.If already finished workpiece blanks are to be machined with the device, then the first processing step described above, namely the generation of a step by introducing the first ends W1 ', W2', W3 'between the two grinding elements 1a, 1a', can be dispensed with. The blanks are then-as described above-introduced immediately between the grinding elements 1b, 1 b 'and 1 c, 1c' and ground as above. In such a case, it is not necessary for the two grinding wheels 1, 1 'used for surface grinding of the workpieces W1, W2, W3 to have three stepped grinding elements 1a-1c, 1a'-1c'.

Dem Fachmann ist aus obiger Beschreibung ersichtlich, dass das beschriebene Verfahren und die beschrieben Vorrichtung nicht auf den Fall eines Werkstücks mit einer einzigen Stufe beschränkt ist. Vielmehr ist es bei der entsprechenden Ausgestaltung der Schleifscheiben 1, 1' auch möglich, in ein und demselben Werkstück mehrere Stufen vorzusehen, indem Schleifscheiben 1, 1' mit einer Anzahl von Schleifelementen 1 a, 1 c, 1a', 1 c' mit entsprechenden Abstufung zur Ausbildung mindestens eines weiteren Teil-Schleifraums verwendet werden.It will be apparent to those skilled in the art from the above description that the described method and apparatus is not limited to the case of a single stage workpiece. Rather, it is in the corresponding embodiment of the grinding wheels 1, 1 'also possible to provide several stages in one and the same workpiece by grinding wheels 1, 1' with a number of grinding elements 1 a, 1 c, 1 a ', 1 c' with corresponding Gradation used to form at least one additional part grinding space.

Claims (7)

Verfahren zur Herstellung eines mindestens eine Stufe aufweisenden Werkstücks (W1-W3), insbesondere eines mindestens eine Stufe aufweisenden Pleuels, bei dem das Werkstück (W1; W2; W3) in einem durch zwei Schleifscheiben (1, 1') begrenzten Schleifraum (10) eingebracht wird, dadurch gekennzeichnet, dass ein erstes Ende (W1'; W2'; W3') des Werkstücks (W1; W2; W3) in einem durch erste Schleifelemente (1 a; 1 a') der Schleifscheiben (1, 1') begrenzten ersten Teil-Schleifraum (10a) eingebracht und von diesen (1 a, 1a') bearbeitet wird, dass nach der Bearbeitung des Werkstücks (W1; W2; W3) durch die ersten Schleifelemente (1 a, 1 a') der Schleifscheiben (1, 1') im ersten Teil-Schleifraum (10a) dieses Werkstück (W1; W2; W3) von einer Werkstücktransporteinrichtung weiter in den Schleifraum (10) eingebracht wird, so dass das zweite Ende (W1"; W2"; W3") in einem durch zweite Schleifelemente (1b, 1b') der Schleifscheiben (1, 1') begrenzten zweiten Teil-Schleifraum (10b) des Schleifraums bearbeitet und das Werkstück (W1; W2; W3) mit seinem ersten Ende (W1'; W2'; W3') in einem durch dritte Schleifelemente (1c, 1c') begrenzten Teil-Schleifraums (10c) bearbeitet wird, wobei die Höhe des ersten Teil-Schleifraums (10a) des Schleifraums (10), die Höhe des zweiten Teil-Schleifraums (10b) und diejenige des dritten TeilSchleifraums (10c) unterschiedlich sind.Method for producing a workpiece (W1-W3) having at least one step, in particular a connecting rod having at least one step, in which the workpiece (W1; W2; W3) is held in a grinding space (10) bounded by two grinding wheels (1, 1 ') is introduced, characterized in that a first end (W1 ', W2', W3 ') of the workpiece (W1; W2; W3) in a by first grinding elements (1 a; 1 a') of the grinding wheels (1, 1 ') limited first part grinding space (10a) is introduced and processed by these (1 a, 1 a '), that after the machining of the workpiece (W1; W2; W3) by the first grinding elements (1 a, 1 a') of the grinding wheels ( 1, 1 ') in the first part-grinding space (10a) of this workpiece (W1; W2; W3) is further fed by a workpiece transport device into the grinding space (10), so that the second end (W1 ";W2"; W3 ") in a second part-grinding space (10b) of the grinding space bea limited by second grinding elements (1b, 1b ') of the grinding wheels (1, 1') works and the workpiece (W1; W2; W3) is machined with its first end (W1 ';W2'; W3 ') in a part-grinding space (10c) bounded by third grinding elements (1c, 1c'), the height of the first part-grinding space (10a) of the grinding space (10), the height of the second part grinding space (10b) and that of the third part grinding space (10c) are different. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Werkstück (W1; W2; W3) in zumindest einen weiteren Teil-Schleifraum eingebracht wird.Method according to Claim 1, characterized in that the workpiece (W1, W2, W3) is introduced into at least one further partial grinding space. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Werkstück (W1; W2; W3) zumindest während eines Teils des Schleifvorgangs auf einer geradlinigen Bahn (5) oder einer gekrümmten Bahn bewegt wird.Method according to one of the preceding claims, characterized in that the workpiece (W1; W2; W3) is moved on a rectilinear path (5) or a curved path at least during part of the grinding process. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass mehrere Werkstücke (W1; W2; W3) gleichzeitig in den Schleifraum (10) eingebracht werden.Method according to one of the preceding claims, characterized in that a plurality of workpieces (W1, W2, W3) are simultaneously introduced into the grinding space (10). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Werkstück (W1; W2; W3) ein Pleuel verwendet wird.Method according to one of the preceding claims, characterized in that a connecting rod is used as the workpiece (W1; W2; W3). Vorrichtung zur Herstellung eines mindestens eine Stufe aufweisenden Werkstücks (W1; W2; W3), die zwei einander gegenüberliegende Schleifscheiben (1, 1') aufweist, die einen Schleifraum (10) definieren, in dem das zu bearbeitende Werkstück (W1; W2; W3) einbringbar ist, dadurch gekennzeichnet, dass mindestens eine der Schleifscheiben (1, 1') mindestens drei Schleifelemente (1a, 1b, 1c; 1a', 1b', 1c') aufweist, und dass die Dicke des ersten Schleifelements (1a; 1a'), die Dicke des zweiten Schleifelements (1b; 1b') und die Dicke des dritten Schleifelement (1c; 1c') unterschiedlich ist, so dass durch die beiden Schleifelemente (1 a, 1b, 1 c; 1a', 1b', 1c') ein in seiner Höhe mindestens zweifach gestufter Schleifraum (10)ausgebildet ist.Device for producing a workpiece (W1, W2, W3) having at least one step, which has two mutually opposite grinding wheels (1, 1 ') defining a grinding space (10) in which the workpiece (W1, W2, W3 ), characterized in that at least one of the grinding wheels (1, 1 ') has at least three grinding elements (1a, 1b, 1c; 1a', 1b ', 1c'), and in that the thickness of the first grinding element (1a, 1a '), the thickness of the second grinding element (1b, 1b') and the thickness of the third grinding element (1c, 1c ') is different, so that the two grinding elements (1a, 1b, 1c, 1a', 1b ', 1c ') is formed in its height at least twice stepped grinding space (10). Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass beide der Schleifscheiben (1; 1') mindestens drei in ihrer Dicke abgestufte Schleifelemente (1b, 1c; 1b', 1c') aufweisen.Apparatus according to claim 6, characterized in that both of the grinding wheels (1, 1 ') have at least three graduated in their thickness grinding elements (1b, 1c, 1b', 1c ').
EP13005787.0A 2012-12-12 2013-12-12 Method and device for producing a workpiece with at least one step Withdrawn EP2743030A3 (en)

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DE201220011897 DE202012011897U1 (en) 2012-12-12 2012-12-12 Device for producing a workpiece having at least one step
DE201210024248 DE102012024248A1 (en) 2012-12-12 2012-12-12 Method for manufacturing connecting rod to provide link between piston and crankshaft of reciprocating engine, involves limiting set of ends by set of grinding elements of wheels by limiting part or grinding area of chamber

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Citations (1)

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DE102006009938B4 (en) 2006-03-03 2008-11-13 Diskus Werke Schleiftechnik Gmbh Device for processing a workpiece

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US4635401A (en) * 1983-09-01 1987-01-13 Daisho Seiki Kabushiki Kaisha Duplex-head surface grinder
JPH09216164A (en) * 1996-02-06 1997-08-19 Kobe Steel Ltd Surface grinding wheel
JP4814282B2 (en) * 2008-05-20 2011-11-16 大昌精機株式会社 Vertical double-sided surface grinding machine

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Publication number Priority date Publication date Assignee Title
DE102006009938B4 (en) 2006-03-03 2008-11-13 Diskus Werke Schleiftechnik Gmbh Device for processing a workpiece

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