EP1920884A1 - Method for strip finishing of workpiece peripheral surfaces - Google Patents

Method for strip finishing of workpiece peripheral surfaces Download PDF

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Publication number
EP1920884A1
EP1920884A1 EP07020675A EP07020675A EP1920884A1 EP 1920884 A1 EP1920884 A1 EP 1920884A1 EP 07020675 A EP07020675 A EP 07020675A EP 07020675 A EP07020675 A EP 07020675A EP 1920884 A1 EP1920884 A1 EP 1920884A1
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EP
European Patent Office
Prior art keywords
workpiece
surface portions
belt
convex
roller
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Granted
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EP07020675A
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German (de)
French (fr)
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EP1920884B1 (en
Inventor
Holger Steinwender
Martin Herbert Lupp
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Thielenhaus Technologies GmbH
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Thielenhaus Technologies GmbH
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Publication of EP1920884A1 publication Critical patent/EP1920884A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/16—Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts

Definitions

  • the invention relates to a method of strip finishing of workpiece peripheral surfaces using an endless and driven abrasive belt.
  • Such a method is for example from the document DE 103 42 135 A1 known.
  • the workpiece to be machined is partially wrapped by the abrasive belt so that the abrasive belt lies flat against the circumference of the workpiece.
  • the DE 103 42 137 A1 describes a method for finish machining crankshafts and camshafts by means of an endless abrasive belt which is associated with a dressing roller to prevent uneven wear of the abrasive layer.
  • a method for finish machining of non-cylindrical camshafts is from the document US 2004/0029499 A1 known.
  • two support rollers press the abrasive belt against the rotating workpiece.
  • the abrasive belt is not endless, but is wound on a spool for spent abrasive belt after one-time contact with the workpiece.
  • the surface of the workpiece is processed linearly in two contact zones with the grinding belt.
  • the invention has for its object to provide a fast and effective method for finish machining of workpieces, in particular of camshafts, with both convex and concave surface portions on the workpiece circumference.
  • the object is achieved by a method for strip finishing of workpiece peripheral surfaces, which have convex and concave surface sections, using an endless and driven abrasive belt, wherein the abrasive belt is applied with a free-tensioned band portion to the convex surface portions of a workpiece and wherein the grinding belt is pressed by a roller against the workpiece surface to be machined for processing the concave surface portions.
  • the inventive method allows a flat support of the grinding belt on the workpiece surface to be machined in the concave Surface areas.
  • the tape is moved at high tape speeds, and easily oscillatory movements can be superimposed. It is achieved with an optimally adapted to the respective surface area tool geometry improvement of the workpiece surface.
  • the inventive method is much more effective than the machining of the concave surface sections with honing stones.
  • the high working speed of the sanding belt enables high removal rates.
  • the inventive method is also very flexible, since it can be used largely independently of the workpiece geometry.
  • the tape follows in the processing of the predetermined shape of the workpiece, in particular to act on the surface roughness.
  • the abrasive belt can be guided over a deflection roller, wherein the deflection roller and the workpiece for processing the convex and concave surfaces are adjusted relative to each other.
  • the deflection roller can be adjusted, for example, transversely to the direction of tape travel to change the wrap angle of the free-tensioned belt section in the processing of convex surface portions and adapt to the curvature of the convex surface portion.
  • the guide roller can be adjusted, for example in the direction of tape travel and thereby press the abrasive belt against the machined concave workpiece surface.
  • the method according to the invention makes it possible, during machining, to switch from the finishing of convex surface sections to the finishing of concave surface sections h. In each case optimum strip contours for the respective surface section to be processed are used.
  • the sanding belt can alternatively also by means of a pressure roller, which is adjustable transversely to the direction of tape travel and acts on the free-tensioned belt section, against the concave Surface portions of the workpiece surfaces to be machined are pressed.
  • the tape always adapts to the shape of the workpiece to avoid a change in shape.
  • the workpiece is rotated during processing and the feed movement of the roller pressing the grinding belt against concave surfaces is controlled as a function of the angular position of the workpiece.
  • first the concave surface sections of the workpiece and subsequently the convex surface sections are machined.
  • the workpiece may be at rest when the concave surface portions are machined while the workpiece is rotating during subsequent processing of the convex surface portions.
  • the strip finish machining is specifically controlled to optimize the workpiece surface.
  • the band contour can be individually adapted to convex or concave surface sections.
  • the roller In order to enable surface contact with the sanding belt during machining of the concave surface sections, the roller preferably has a surface that is soft compared to steel, for example Vulkollan or rubber, in particular of low Shore hardness.
  • the workpiece to be machined in the exemplary embodiment is a camshaft 2.
  • the grinding belt 1 is applied to the camshaft 2 with a free-tensioned belt portion (see Fig. 1a).
  • the sanding belt 1 is pressed against the workpiece surface to be machined by means of a roller 3 (see FIG. 1b).
  • the sanding belt 1 is guided over the roller 3, which is also designed as a deflection roller.
  • the guide roller 3 is adjusted for machining the convex and concave surfaces of the camshaft 2 relative thereto (see arrows in Figs. 1a and 1b).
  • the guide roller 3 is moved transversely to the strip running direction to change the wrap angle ⁇ of the free-tensioned band section in the processing of convex surface portions and adapt to the curvature of the convex surface portion.
  • the guide roller 3 is adjusted in the strip running direction and presses when machining the concave surface sections the sanding belt 1 against the camshaft 2. With an optimally adapted to the surface of the camshaft 2 contour of the sanding belt 1 is in the camshaft 2, a surface improvement achieved.
  • FIGS. 2 a and 2 b show an alternative method according to the invention.
  • a pressure roller 4 is additionally provided, which is adjustable transversely to the direction of tape travel.
  • the pinch roller 4 When machining convex surface portions, the pinch roller 4 is in a rest position and is spaced from the sanding belt 1.
  • the pinch roller 4 acts on the free-tensioned belt section and presses the sanding belt 1 against the concave workpiece surface.
  • the contour of the grinding belt 1 can thus be adjusted individually to concave workpiece surfaces.
  • the workpiece 2 is rotated during processing.
  • the feed movement of the grinding belt against the concave workpiece surfaces pressing roller 3 and 4 is controlled in dependence of the angular position of the workpiece 2, so that the roller 3, 4 abuts the corresponding angle on the concave surface.
  • Optimal for the machining time is a process with continuous rotation of the workpiece, wherein the feed movement of the roller 3, 4 is controlled in the manner described above during the continuous rotation of the workpiece 2.
  • An existing under the teaching of the invention method variant is that first the concave surface portions of the workpiece 2 are processed with appropriate delivery of the roller 3, 4 and then the convex surface portions, ie the process steps shown in FIGS. 1b and 2b before the method steps in FIGS. 1a and 2a performed.
  • the workpiece 2 is at rest when the concave surface portions are processed, while the workpiece 2 rotates in the subsequent processing of the convex surface portions.
  • the method according to the invention makes it possible to control the strip finishing process for optimizing the workpiece surface.
  • abrasive belt 1 and workpiece 2 can be selected during machining between a concave or a convex geometry.
  • This Berlickkontur can also be changed during processing, so that the Grinding belt 1 each follows the predetermined shape of the workpiece 2 and thus does not change the shape of the workpiece 2, but only edited its surface roughness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The method involves arranging a grinding belt with a freely clamped belt section on the convex surface section of a workpiece. The grinding belt is pressed against the workpiece surface to be machined by a roller for machining the concave surface section. The grinding belt is guided on a deflection roller. The deflection roller and the workpiece are adjusted relative to each other for machining the convex and concave surfaces.

Description

Die Erfindung betrifft ein Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen unter Verwendung eines endlosen und angetriebenen Schleifbandes.The invention relates to a method of strip finishing of workpiece peripheral surfaces using an endless and driven abrasive belt.

Ein derartiges Verfahren ist beispielsweise aus der Druckschrift DE 103 42 135 A1 bekannt. Das zu bearbeitende Werkstück wird von dem Schleifband teilweise umschlungen, so dass das Schleifband am Umfang des Werkstückes flächig anliegt.Such a method is for example from the document DE 103 42 135 A1 known. The workpiece to be machined is partially wrapped by the abrasive belt so that the abrasive belt lies flat against the circumference of the workpiece.

Aus der Druckschrift DE 103 42 139 A1 ist ein Verfahren zur Finishbearbeitung von Umfangsflächen an wellenförmigen Werkstücken bekannt, bei dem ebenfalls ein endloses Schleifband eingesetzt wird. Um eine flexible Werkstückbearbeitung zu ermöglichen, wird der Umschlingungswinkel des Schleifbandes während der Bearbeitung des Werkstückes verändert.From the publication DE 103 42 139 A1 is a method for finishing peripheral surfaces of wavy workpieces known, in which also an endless abrasive belt is used. In order to enable flexible workpiece machining, the wrap angle of the grinding belt is changed during the machining of the workpiece.

Die DE 103 42 137 A1 beschreibt ein Verfahren zur Finishbearbeitung von Kurbel- und Nockenwellen mittels eines endlosen Schleifbandes, dem zur Vermeidung einer ungleichmäßigen Abnutzung der Schleifmittelschicht eine Abrichtrolle zugeordnet ist.The DE 103 42 137 A1 describes a method for finish machining crankshafts and camshafts by means of an endless abrasive belt which is associated with a dressing roller to prevent uneven wear of the abrasive layer.

Ein Verfahren zur Finishbearbeitung von nicht-zylindrischen Nockenwellen ist aus der Druckschrift US 2004/0029499 A1 bekannt. Bei dem bekannten Verfahren drücken zwei Stützrollen das Schleifband gegen das rotierende Werkstück. Das Schleifband ist nicht endlos, sondern wird nach dem einmaligen Kontakt mit dem Werkstück auf eine Spule für verbrauchtes Schleifband aufgewickelt. Die Oberfläche des Werkstückes wird in zwei Kontaktzonen mit dem Schleifband linienförmig bearbeitet.A method for finish machining of non-cylindrical camshafts is from the document US 2004/0029499 A1 known. In the known method, two support rollers press the abrasive belt against the rotating workpiece. The abrasive belt is not endless, but is wound on a spool for spent abrasive belt after one-time contact with the workpiece. The surface of the workpiece is processed linearly in two contact zones with the grinding belt.

Die erläuterten Verfahren haben sich zur Finishbearbeitung konvexer Werkstückgeometrien bewährt. Mit diesen Verfahren ist jedoch eine vollflächige Bearbeitung nicht möglich, sofern die Werkstückumfangsflächen sowohl konvexe als auch konkave Flächenabschnitte aufweisen, wie dies beispielsweise bei Nockenwellen der Fall sein kann. Denn bei der beschriebenen Bandbearbeitung überspannt das Schleifband die konkaven Bereiche, so dass diese nicht bearbeitet werden können. Zum Finishen dieser Werkstückbereiche werden daher Honsteine eingesetzt. Die Bearbeitung mittels Honsteinen ist jedoch vergleichsweise aufwendig und daher zeitraubend.The described methods have proven themselves for finishing convex workpiece geometries. With this method, however, a full-surface machining is not possible, if the workpiece peripheral surfaces have both convex and concave surface portions, as may be the case for example with camshafts. Because in the band processing described the abrasive belt spans the concave areas, so that they can not be edited. Honing stones are therefore used to finish these workpiece areas. However, the processing by means of honing stones is comparatively complicated and therefore time-consuming.

Vor dem Hintergrund der beschriebenen Problematik liegt der Erfindung die Aufgabe zugrunde, ein schnelles und effektives Verfahren zur Finishbearbeitung von Werkstücken, insbesondere von Nockenwellen, mit sowohl konvexen als auch konkaven Oberflächenabschnitten am Werkstückumfang anzugeben.Against the background of the problem described, the invention has for its object to provide a fast and effective method for finish machining of workpieces, in particular of camshafts, with both convex and concave surface portions on the workpiece circumference.

Erfindungsgemäß wird die Aufgabe gelöst durch ein Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen, die konvexe und konkave Flächenabschnitte aufweisen, unter Verwendung eines endlosen und angetriebenen Schleifbandes,
wobei das Schleifband mit einem frei gespannten Bandabschnitt an die konvexen Flächenabschnitte eines Werkstückes angelegt wird und
wobei das Schleifband zur Bearbeitung der konkaven Flächenabschnitte mittels einer Rolle gegen die zu bearbeitende Werkstückfläche gedrückt wird.According to the invention, the object is achieved by a method for strip finishing of workpiece peripheral surfaces, which have convex and concave surface sections, using an endless and driven abrasive belt,
wherein the abrasive belt is applied with a free-tensioned band portion to the convex surface portions of a workpiece and
wherein the grinding belt is pressed by a roller against the workpiece surface to be machined for processing the concave surface portions.

Das erfindungsgemäße Verfahren ermöglicht eine flächige Auflage des Schleifbandes an der zu bearbeitenden Werkstückfläche auch in den konkaven Oberflächenbereichen. Das Band wird mit großen Bandgeschwindigkeiten bewegt, wobei ohne weiteres auch Oszillationsbewegungen überlagert werden können. Es wird mit einer auf den jeweiligen Oberflächenbereich optimal angepassten Werkzeuggeometrie eine Verbesserung der Werkstückoberfläche erzielt. Das erfindungsgemäße Verfahren ist wesentlich effektiver als die Bearbeitung der konkaven Oberflächenabschnitte mit Honsteinen. Die hohe Arbeitsgeschwindigkeit des Schleifbandes ermöglicht große Abtragsgeschwindigkeiten. Das erfindungsgemäße Verfahren ist ferner sehr flexibel, da es weitgehend unabhängig von der Werkstückgeometrie eingesetzt werden kann. Das Band folgt bei der Bearbeitung der vorgegebenen Form des Werkstückes, um insbesondere auf die Oberflächenrauheit einzuwirken.The inventive method allows a flat support of the grinding belt on the workpiece surface to be machined in the concave Surface areas. The tape is moved at high tape speeds, and easily oscillatory movements can be superimposed. It is achieved with an optimally adapted to the respective surface area tool geometry improvement of the workpiece surface. The inventive method is much more effective than the machining of the concave surface sections with honing stones. The high working speed of the sanding belt enables high removal rates. The inventive method is also very flexible, since it can be used largely independently of the workpiece geometry. The tape follows in the processing of the predetermined shape of the workpiece, in particular to act on the surface roughness.

Das Schleifband kann über eine Umlenkrolle geführt werden, wobei die Umlenkrolle und das Werkstück zur Bearbeitung der konvexen und konkaven Flächen relativ zueinander verstellt werden. Die Umlenkrolle kann beispielsweise quer zur Bandlaufrichtung verstellt werden, um den Umschlingungswinkel des frei gespannten Bandabschnittes bei der Bearbeitung konvexer Flächenabschnitte zu verändern und an die Krümmung des konvexen Flächenabschnittes anzupassen. Bei der Bearbeitung der konkaven Flächenabschnitte kann die Umlenkrolle beispielsweise in Bandlaufrichtung verstellt werden und hierdurch das Schleifband gegen die zu bearbeitende konkave Werkstückfläche drücken. Das erfindungsgemäße Verfahren ermöglicht es, während der Bearbeitung von dem Finishen von konvexen Oberflächenabschnitten auf das Finishen von konkaven Oberfiächenabschnitteh umzuschalten. Dabei kommen jeweils optimale Bandkonturen für den jeweils zu bearbeitenden Oberflächenabschnitt zum Einsatz.The abrasive belt can be guided over a deflection roller, wherein the deflection roller and the workpiece for processing the convex and concave surfaces are adjusted relative to each other. The deflection roller can be adjusted, for example, transversely to the direction of tape travel to change the wrap angle of the free-tensioned belt section in the processing of convex surface portions and adapt to the curvature of the convex surface portion. When machining the concave surface portions, the guide roller can be adjusted, for example in the direction of tape travel and thereby press the abrasive belt against the machined concave workpiece surface. The method according to the invention makes it possible, during machining, to switch from the finishing of convex surface sections to the finishing of concave surface sections h. In each case optimum strip contours for the respective surface section to be processed are used.

Zur Bearbeitung der konkaven Flächenabschnitte kann das Schleifband auch alternativ mittels einer Druckrolle, die quer zur Bandlaufrichtung verstellbar ist und auf den frei gespannten Bandabschnitt wirkt, gegen die konkaven Flächenabschnitte der zu bearbeitenden Werkstückflächen gedrückt werden. Dabei passt sich das Band immer der Form des Werkstückes an, um eine Formänderung zu vermeiden.For machining the concave surface portions, the sanding belt can alternatively also by means of a pressure roller, which is adjustable transversely to the direction of tape travel and acts on the free-tensioned belt section, against the concave Surface portions of the workpiece surfaces to be machined are pressed. The tape always adapts to the shape of the workpiece to avoid a change in shape.

Im Rahmen der Erfindung liegt es, dass das Werkstück während der Bearbeitung gedreht wird und die Zustellbewegung der das Schleifband gegen konkave Flächen drückenden Rolle in Abhängigkeit der Winkelstellung des Werkstücks gesteuert wird.It is within the scope of the invention that the workpiece is rotated during processing and the feed movement of the roller pressing the grinding belt against concave surfaces is controlled as a function of the angular position of the workpiece.

Im Rahmen der Erfindung liegt es jedoch auch, dass zunächst die konkaven Flächenabschnitte des Werkstückes und im Anschluss daran die konvexen Flächenabschnitte bearbeitet werden. Das Werkstück kann hierbei in Ruhe sein, wenn die konkaven Flächenabschnitte bearbeitet werden, während das Werkstück bei der nachfolgenden Bearbeitung der konvexen Flächenabschnitte rotiert. Durch das erfindungsgemäße Verfahren wird die Bandfinishbearbeitung gezielt zur Optimierung der Werkstückoberfläche gesteuert. Die Bandkontur kann individuell an konvexe oder konkave Oberflächenabschnitte angepasst werden.However, it is also within the scope of the invention that first the concave surface sections of the workpiece and subsequently the convex surface sections are machined. The workpiece may be at rest when the concave surface portions are machined while the workpiece is rotating during subsequent processing of the convex surface portions. By means of the method according to the invention, the strip finish machining is specifically controlled to optimize the workpiece surface. The band contour can be individually adapted to convex or concave surface sections.

Um bei der Bearbeitung der konkaven Flächenabschnitte einen Flächenkontakt mit dem Schleifband zu ermöglichen, weist die Rolle vorzugsweise eine im Vergleich zu Stahl weiche Oberfläche, beispielsweise aus Vulkollan oder Gummi, insbesondere mit niedriger Shorehärte, auf.In order to enable surface contact with the sanding belt during machining of the concave surface sections, the roller preferably has a surface that is soft compared to steel, for example Vulkollan or rubber, in particular of low Shore hardness.

Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlich erläutert. Es zeigen schematisch:

Fig. 1a, 1b
ein erfindungsgemäßes Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen mit sowohl konvexen als auch konkaven Flächenabschnitten und
Fig. 2a, 2b
eine alternative Ausführungsform des erfindungsgemäßen Verfahrens.
In the following the invention will be explained in detail with reference to a drawing showing only one embodiment. They show schematically:
Fig. 1a, 1b
an inventive method for strip finishing of workpiece peripheral surfaces with both convex and concave surface portions and
Fig. 2a, 2b
an alternative embodiment of the method according to the invention.

Die Fig. 1a und 1b zeigen ein erfindungsgemäßes Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen, die konvexe und konkave Flächenabschnitte aufweisen, unter Verwendung eines endlosen und angetriebenen Schleifbandes 1. Bei dem zu bearbeitenden Werkstück handelt es sich im Ausführungsbeispiel um eine Nockenwelle 2. Zur Bearbeitung der konvexen Flächenabschnitte der Nockenwelle 2 wird das Schleifband 1 mit einem frei gespannten Bandabschnitt an die Nockenwelle 2 angelegt (siehe Fig. 1a). Bei der Bearbeitung der konkaven Flächenabschnitte hingegen wird das Schleifband 1 mittels einer Rolle 3 gegen die zu bearbeitende Werkstückfläche gedrückt (siehe Fig. 1b). Das Schleifband 1 wird über die gleichzeitig als Umlenkrolle ausgebildete Rolle 3 geführt. Die Umlenkrolle 3 wird zur Bearbeitung der konvexen und konkaven Flächen der Nockenwelle 2 relativ zu dieser verstellt (siehe Pfeile in den Fig. 1a und 1b). In Fig. 1a wird die Umlenkrolle 3 quer zur Bandlaufrichtung verstellt, um den Umschlingungswinkel α des frei gespannten Bandabschnittes bei der Bearbeitung konvexer Flächenabschnitte zu verändern und an die Krümmung des konvexen Flächenabschnittes anzupassen. In Fig. 1b hingegen wird die Umlenkrolle 3 in Bandlaufrichtung verstellt und drückt so bei der Bearbeitung der konkaven Flächenabschnitte das Schleifband 1 gegen die Nockenwelle 2. Mit einer optimal an die Oberfläche der Nockenwelle 2 angepassten Kontur des Schleifbandes 1 wird bei der Nockenwelle 2 eine Oberflächenverbesserung erzielt.1a and 1b show an inventive method for strip finishing of workpiece peripheral surfaces having convex and concave surface portions, using an endless and driven abrasive belt 1. The workpiece to be machined in the exemplary embodiment is a camshaft 2. To edit the convex Surface portions of the camshaft 2, the grinding belt 1 is applied to the camshaft 2 with a free-tensioned belt portion (see Fig. 1a). By contrast, when machining the concave surface sections, the sanding belt 1 is pressed against the workpiece surface to be machined by means of a roller 3 (see FIG. 1b). The sanding belt 1 is guided over the roller 3, which is also designed as a deflection roller. The guide roller 3 is adjusted for machining the convex and concave surfaces of the camshaft 2 relative thereto (see arrows in Figs. 1a and 1b). In Fig. 1a, the guide roller 3 is moved transversely to the strip running direction to change the wrap angle α of the free-tensioned band section in the processing of convex surface portions and adapt to the curvature of the convex surface portion. In contrast, in Fig. 1b, the guide roller 3 is adjusted in the strip running direction and presses when machining the concave surface sections the sanding belt 1 against the camshaft 2. With an optimally adapted to the surface of the camshaft 2 contour of the sanding belt 1 is in the camshaft 2, a surface improvement achieved.

In den Fig. 2a und 2b ist ein alternatives erfindungsgemäßes Verfahren dargestellt. Bei diesem Verfahren ist zusätzlich eine Druckrolle 4 vorgesehen, die quer zur Bandlaufrichtung verstellbar ist. Bei der Bearbeitung konvexer Flächenabschnitte befindet sich die Andruckrolle 4 in einer Ruheposition und ist von dem Schleifband 1 beabstandet. Bei der Bearbeitung konkaver Flächenabschnitte wirkt hingegen die Andruckrolle 4 auf den frei gespannten Bandabschnitt und drückt das Schleifband 1 gegen die konkave Werkstückoberfläche. Durch eine Verstellung der Druckrolle 4 kann die Kontur des Schleifbandes 1 damit auch individuell an konkave Werkstückoberflächen angepasst werden.FIGS. 2 a and 2 b show an alternative method according to the invention. In this method, a pressure roller 4 is additionally provided, which is adjustable transversely to the direction of tape travel. When machining convex surface portions, the pinch roller 4 is in a rest position and is spaced from the sanding belt 1. When machining concave surface portions, however, the pinch roller 4 acts on the free-tensioned belt section and presses the sanding belt 1 against the concave workpiece surface. By adjusting the pressure roller 4, the contour of the grinding belt 1 can thus be adjusted individually to concave workpiece surfaces.

Wie aus den Fig. 1 a bis 2b ersichtlich ist, wird das Werkstück 2 während der Bearbeitung gedreht. Die Zustellbewegung der das Schleifband gegen die konkaven Werkstückflächen drückenden Rolle 3 bzw. 4 wird in Abhängigkeit der Winkelstellung des Werkstückes 2 gesteuert, so dass die Rolle 3, 4 beim entsprechenden Winkel an der konkaven Fläche anliegt.As can be seen from FIGS. 1 a to 2 b, the workpiece 2 is rotated during processing. The feed movement of the grinding belt against the concave workpiece surfaces pressing roller 3 and 4 is controlled in dependence of the angular position of the workpiece 2, so that the roller 3, 4 abuts the corresponding angle on the concave surface.

Optimal für die Bearbeitungszeit ist ein Verfahren mit kontinuierlicher Drehung des Werkstückes, wobei die Zustellbewegung der Rolle 3, 4 in der zuvor beschriebenen Weise während der kontinuierlichen Drehung des Werkstückes 2 gesteuert wird. Eine unter die erfindungsgemäße Lehre bestehende Verfahrensvariante besteht darin, dass zunächst die konkaven Flächenabschnitte des Werkstückes 2 unter entsprechender Zustellung der Rolle 3, 4 und im Anschluss daran die konvexen Flächenabschnitte bearbeitet werden, d. h. die in den Fig. 1b bzw. 2b dargestellten Verfahrensschritte werden vor den Verfahrensschritten in den Fig. 1a und 2a durchgeführt. Bei dieser Verfahrensvariante kann vorgesehen werden, dass das Werkstück 2 in Ruhe ist, wenn die konkaven Flächenabschnitte bearbeitet werden, während das Werkstück 2 bei der nachfolgenden Bearbeitung der konvexen Flächenabschnitte rotiert. Das erfindungsgemäße Verfahren ermöglicht es, die Bandfinishbearbeitung zur Optimierung der Werkstückoberfläche zu steuern. An der Berührstelle zwischen Schleifband 1 und Werkstück 2 kann während der Bearbeitung zwischen einer konkaven oder einer konvexen Geometrie gewählt werden. Diese Berührkontur kann auch während der Bearbeitung gewechselt werden, so dass das Schleifband 1 jeweils der vorgegebenen Form des Werkstücks 2 folgt und damit nicht die Form des Werkstücks 2 ändert, sondern nur dessen Oberflächenrauheit bearbeitet.Optimal for the machining time is a process with continuous rotation of the workpiece, wherein the feed movement of the roller 3, 4 is controlled in the manner described above during the continuous rotation of the workpiece 2. An existing under the teaching of the invention method variant is that first the concave surface portions of the workpiece 2 are processed with appropriate delivery of the roller 3, 4 and then the convex surface portions, ie the process steps shown in FIGS. 1b and 2b before the method steps in FIGS. 1a and 2a performed. In this variant of the method can be provided that the workpiece 2 is at rest when the concave surface portions are processed, while the workpiece 2 rotates in the subsequent processing of the convex surface portions. The method according to the invention makes it possible to control the strip finishing process for optimizing the workpiece surface. At the point of contact between abrasive belt 1 and workpiece 2 can be selected during machining between a concave or a convex geometry. This Berührkontur can also be changed during processing, so that the Grinding belt 1 each follows the predetermined shape of the workpiece 2 and thus does not change the shape of the workpiece 2, but only edited its surface roughness.

Claims (9)

Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen, die konvexe und konkave Flächenabschnitte aufweisen, unter Verwendung eines endlosen und angetriebenen Schleifbandes (1),
wobei das Schleifband (1) mit einem frei gespannten Bandabschnitt an die konvexen Flächenabschnitte eines Werkstückes (2) angelegt wird und
wobei das Schleifband zur Bearbeitung der konkaven Flächenabschnitte mittels einer Rolle gegen die zu bearbeitende Werkstückfläche gedrückt wird.Method of strip finishing of workpiece peripheral surfaces having convex and concave surface portions using an endless and driven abrasive belt (1),
wherein the abrasive belt (1) is applied to the convex surface portions of a workpiece (2) with a free stretched band portion, and
wherein the grinding belt is pressed by a roller against the workpiece surface to be machined for processing the concave surface portions. Verfahren nach Anspruch 1, wobei das Schleifband (1) über eine Umlenkrolle (3) geführt wird und wobei die Umlenkrolle (3) und das Werkstück (2) zur Bearbeitung der konvexen und konkaven Flächen relativ zueinander verstellt werden.Method according to claim 1, wherein the sanding belt (1) is guided over a deflection roller (3) and wherein the deflection roller (3) and the workpiece (2) are adjusted relative to each other for machining the convex and concave surfaces. Verfahren nach Anspruch 2, wobei die Umlenkrolle (3) quer zur Bandlaufrichtung verstellt wird, um den Umschlingungswinkel (α) des frei gespannten Bandabschnittes bei der Bearbeitung konvexer Flächenabschnitte zu verändern und an die Krümmung des konvexen Flächenabschnittes anzupassen.The method of claim 2, wherein the deflection roller (3) is adjusted transversely to the strip running direction in order to change the wrap angle (α) of the free-tensioned band section in the processing of convex surface portions and adapted to the curvature of the convex surface portion. Verfahren nach Anspruch 2, wobei die Umlenkrolle (3) in Bandlaufrichtung verstellt wird und bei der Bearbeitung der konkaven Flächenabschnitte des Werkstückes (2) das Schleifband (1) gegen die zu bearbeitende Werkstückfläche drückt.Method according to claim 2, wherein the deflection roller (3) is adjusted in the direction of travel of the strip and, during the machining of the concave surface sections of the workpiece (2), presses the grinding belt (1) against the workpiece surface to be machined. Verfahren nach einem der Ansprüche 1 bis 3, wobei das Schleifband (1) mittels einer Druckrolle (4), die quer zur Bandlaufrichtung verstellbar ist und auf den freigespannten Bandabschnitt wirkt, gegen die konkaven Flächenabschnitte der zu bearbeitenden Werkstückfläche gedrückt wird.Method according to one of claims 1 to 3, wherein the abrasive belt (1) by means of a pressure roller (4) which is adjustable transversely to the strip running direction and acts on the free-stretched belt section, is pressed against the concave surface portions of the workpiece surface to be machined. Verfahren nach einem der Ansprüche 1 bis 5, wobei das Werkstück (2) während der Bearbeitung gedreht wird und die Zustellbewegung der das Schleifband (1) gegen konkave Flächen drückenden Rolle (3, 4) in Abhängigkeit der Winkelstellung des Werkstückes (2) gesteuert wird.Method according to one of claims 1 to 5, wherein the workpiece (2) is rotated during machining and the feed movement of the abrasive belt (1) against concave surfaces oppressive roller (3, 4) is controlled in dependence of the angular position of the workpiece (2) , Verfahren nach Anspruch 6, wobei das Werkstück (2) während der Bearbeitung kontinuierlich gedreht wird.The method of claim 6, wherein the workpiece (2) is rotated continuously during machining. Verfahren nach einem der Ansprüche 1 bis 6, wobei zunächst die konkaven Flächenabschnitte des Werkstückes (2) und im Anschluss daran die konvexen Flächenabschnitte bearbeitet werden.Method according to one of claims 1 to 6, wherein first the concave surface portions of the workpiece (2) and subsequently the convex surface portions are processed. Verfahren nach Anspruch 8, wobei das Werkstück (2) in Ruhe ist, wenn die konkaven Flächenabschnitte bearbeitet werden und wobei das Werkstück (2) während der nachfolgenden Bearbeitung der konvexen Flächenabschnitte rotiert.The method of claim 8, wherein the workpiece (2) is at rest when the concave surface portions are machined and wherein the workpiece (2) rotates during subsequent processing of the convex surface portions.
EP20070020675 2006-11-09 2007-10-23 Method for strip finishing of workpiece peripheral surfaces Expired - Fee Related EP1920884B1 (en)

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DE4029129A1 (en) 1990-09-13 1992-03-19 Bayerische Motoren Werke Ag Abrasive belt attachment for camshaft grinder - is fastened to infeed slide and moves to=and=fro as one unit to produce cam profile
US20040029499A1 (en) 2002-02-05 2004-02-12 Richard Bonachera Process and device for the machining by abrasive belt of a bearing surface on a component, particularly for superfinishing a cam surface on a cam shaft
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