EP1920884B1 - Method for strip finishing of workpiece peripheral surfaces - Google Patents
Method for strip finishing of workpiece peripheral surfaces Download PDFInfo
- Publication number
- EP1920884B1 EP1920884B1 EP20070020675 EP07020675A EP1920884B1 EP 1920884 B1 EP1920884 B1 EP 1920884B1 EP 20070020675 EP20070020675 EP 20070020675 EP 07020675 A EP07020675 A EP 07020675A EP 1920884 B1 EP1920884 B1 EP 1920884B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpiece
- strip
- convex
- concave
- machining
- 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.)
- Expired - Fee Related
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Classifications
-
- 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 for strip finishing of workpiece peripheral surfaces using an endless and driven abrasive belt, wherein the abrasive belt is pressed for working konkaver surface portions of a workpiece by means of a roller against the workpiece surface to be machined.
- 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 used after a single contact with the workpiece on a spool for spent Sanding belt wound up.
- the surface of the workpiece is processed linearly in two contact zones with the grinding belt.
- DE 40 29 129 A1 For example, a method for grinding cams by means of a revolving belt is described.
- the sanding belt is guided over a deflection roller which presses the sanding belt against the cam surface to be machined.
- 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 in that the grinding belt is applied with a free-tensioned band section to the convex surface portions of a workpiece.
- the method according to the invention enables a flat support of the grinding belt on the workpiece surface to be machined, even in the concave surface regions.
- the tape is moved at high tape speeds, and easily oscillatory movements can be superimposed. It will be with one on the respective surface area optimally adapted tool geometry achieves an 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. In each case optimum strip contours for the respective surface section to be processed are used.
- the sanding belt can alternatively be pressed against the concave surface portions of the workpiece surfaces to be machined by means of a pressure roller, which is adjustable transversely to the strip running direction and acts on the free-tensioned belt section.
- 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 Fig. 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 is in the exemplary embodiment to a camshaft 2.
- the grinding belt. 1 pressed by means of a roller 3 against the workpiece surface to be machined (see Fig. 1b ).
- the grinding belt 1 is applied to the camshaft 2 with a free-tensioned belt section (see Fig. 1a ).
- the sanding belt 1 is guided over the roller 3, which is also designed as a deflection roller.
- the deflection roller 3 is adjusted for machining the convex and concave surfaces of the camshaft 2 relative to this (see arrows in the Fig. 1a and 1b ).
- Fig. 1a the deflection roller 3 is moved transversely to the strip running direction to change the wrap angle ⁇ of the free-tensioned band section during the processing of convex surface portions and adapted to the curvature of the convex surface portion.
- the guide roller 3 is adjusted in the strip running direction and thus presses the machining of 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 achieved in the camshaft 2, a surface improvement.
- a pressure roller 4 is additionally provided, which is adjustable transversely to the direction of tape travel.
- 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 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 in the Fig. 1b or 2b illustrated process steps are prior to the process steps in the Fig. 1a and 2a carried out.
- 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 Bermmkontur can also be changed during processing, so that the grinding belt 1 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.
Landscapes
- 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)
Description
Die Erfindung betrifft ein Verfahren zur Bandfinishbearbeitung von Werkstückumfangsflächen unter Verwendung eines endlosen und angetriebenen Schleifbandes, wobei das Schleifband zur Bearbeitung konkaver Flächenabschnitte eines Werkstücks mittels einer Rolle gegen die zu bearbeitende Werkstückfläche gedrückt wird.The invention relates to a method for strip finishing of workpiece peripheral surfaces using an endless and driven abrasive belt, wherein the abrasive belt is pressed for working konkaver surface portions of a workpiece by means of a roller against the workpiece surface to be machined.
Ein derartiges Verfahren ist beispielsweise aus der Druckschrift
Aus der Druckschrift
Die
Ein Verfahren zur Finishbearbeitung von nicht-zylindrischen Nockenwellen ist aus der Druckschrift
In
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 these methods, 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 dadurch gelöst, dass das Schleifband mit einem frei gespannten Bandabschnitt an die konvexen Flächenabschnitte eines Werkstückes angelegt wird. 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.According to the invention, the object is achieved in that the grinding belt is applied with a free-tensioned band section to the convex surface portions of a workpiece. The method according to the invention enables a flat support of the grinding belt on the workpiece surface to be machined, even in the concave surface regions. The tape is moved at high tape speeds, and easily oscillatory movements can be superimposed. It will be with one on the respective surface area optimally adapted tool geometry achieves an 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 Oberflächenabschnitten 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. 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 be pressed against the concave surface portions of the workpiece surfaces to be machined by means of a pressure roller, which is adjustable transversely to the strip running direction and acts on the free-tensioned belt section. 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 Ver- fahrens.
- Fig. 1a,
- 1b shows a method according to the invention for strip finishing of workpiece peripheral surfaces with both convex and concave surface sections and
- Fig. 2a, 2b
- an alternative embodiment of the method according to the invention.
Die
In den
Wie aus den
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
Claims (9)
- Method for strip finishing of workpiece peripheral faces, which have convex and concave face sections, using an endless and driven grinding strip (1),
wherein the grinding strip (1) for machining concave face sections of a workpiece (2) is pressed against the workpiece face to be machined by means of a roller,
characterised in that the grinding strip (1) is placed against the convex face sections of the workpiece (2) with a freely tensioned strip section. - Method according to Claim 1, characterised in that the grinding strip (1) is guided over a pulley (3) and wherein the pulley (3) and the workpiece (2) are adjusted relative to one another in order to machine the convex and concave faces.
- Method according to Claim 2, characterised in that the pulley (3) is adjusted transversely with respect to the strip running direction in order to change the wrap angle (α) of the freely tensioned strip section when machining convex face sections and to adapt the said angle to the curvature of the convex face section.
- Method according to Claim 2, characterised in that the pulley (3) is adjusted in the strip running direction and presses the grinding strip (1) against the workpiece face to be machined when machining the concave face sections of the workpiece (2).
- Method according to one of Claims 1 to 3, characterised in that the grinding strip (1) is pressed against the concave face sections of the workpiece face to be machined by means of a pressure roller (4), which can be adjusted transversely with respect to the strip running direction and acts on the freely tensioned strip section.
- Method according to one of Claims 1 to 5, characterised in that the workpiece (2) is rotated during machining and the placing movement of the roller (3, 4) which presses the grinding strip (1) against concave faces is controlled as a function of the angle position of the workpiece (2).
- Method according to Claim 6, characterised in that the workpiece (2) is continuously rotated during machining.
- Method according to one of Claims 1 to 6, characterised in that first the concave face sections of the workpiece (2) and then the convex face sections are machined.
- Method according to Claim 8, characterised in that the workpiece (2) is at rest when the concave face sections are machined and wherein the workpiece (2) rotates during the subsequent machining of the convex face sections.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610052829 DE102006052829A1 (en) | 2006-11-09 | 2006-11-09 | Method for strip finishing of workpiece peripheral surfaces |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1920884A1 EP1920884A1 (en) | 2008-05-14 |
EP1920884B1 true EP1920884B1 (en) | 2009-05-13 |
Family
ID=38792020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070020675 Expired - Fee Related EP1920884B1 (en) | 2006-11-09 | 2007-10-23 | Method for strip finishing of workpiece peripheral surfaces |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1920884B1 (en) |
JP (1) | JP2008119824A (en) |
DE (2) | DE102006052829A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5379607B2 (en) * | 2009-08-27 | 2013-12-25 | 株式会社サンシン | Polishing method and apparatus |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HU209638B (en) * | 1989-10-27 | 1994-09-28 | Miskolci Egyetem | Method and apparatus for generating machining with abrasive belt |
DE4029129C2 (en) | 1990-09-13 | 1994-12-22 | Bayerische Motoren Werke Ag | Device for grinding in particular hollow cams |
DE4235408A1 (en) * | 1992-10-21 | 1994-04-28 | Schaudt Maschinenbau Gmbh | Method and device for grinding non-circular workpieces |
FR2835460B1 (en) * | 2002-02-05 | 2004-07-23 | Procedes Et Machines Speciales | METHOD AND DEVICE FOR MACHINING BY ABRASIVE BELT OF A SURFACE ON A WORKPIECE, PARTICULARLY FOR THE SURFACE OF A CAM SURFACE ON A CAMSHAFT |
DE10342137B4 (en) * | 2003-09-12 | 2010-07-29 | Thielenhaus Technologies Gmbh | Apparatus and method for finish machining of shafts, in particular crankshafts and camshafts |
DE10342135A1 (en) * | 2003-09-12 | 2005-04-07 | Thielenhaus Technologies Gmbh | Device for finish machining of shafts, in particular crankshafts and camshafts |
DE10342139B4 (en) * | 2003-09-12 | 2008-06-19 | Thielenhaus Technologies Gmbh | Process for finishing peripheral surfaces on wave-shaped workpieces |
-
2006
- 2006-11-09 DE DE200610052829 patent/DE102006052829A1/en not_active Withdrawn
-
2007
- 2007-10-23 DE DE200750000725 patent/DE502007000725D1/en active Active
- 2007-10-23 EP EP20070020675 patent/EP1920884B1/en not_active Expired - Fee Related
- 2007-11-02 JP JP2007285712A patent/JP2008119824A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
EP1920884A1 (en) | 2008-05-14 |
DE102006052829A1 (en) | 2008-05-15 |
JP2008119824A (en) | 2008-05-29 |
DE502007000725D1 (en) | 2009-06-25 |
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