EP2712702B1 - Belt finishing device, belt finishing system and method for producing a belt finishing device - Google Patents

Belt finishing device, belt finishing system and method for producing a belt finishing device Download PDF

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Publication number
EP2712702B1
EP2712702B1 EP12186775.8A EP12186775A EP2712702B1 EP 2712702 B1 EP2712702 B1 EP 2712702B1 EP 12186775 A EP12186775 A EP 12186775A EP 2712702 B1 EP2712702 B1 EP 2712702B1
Authority
EP
European Patent Office
Prior art keywords
belt
finishing
workpiece
bearing
bearing surfaces
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.)
Active
Application number
EP12186775.8A
Other languages
German (de)
French (fr)
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EP2712702A1 (en
Inventor
Oliver Hildebrandt
Simon Wolber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Supfina Grieshaber GmbH and Co KG
Original Assignee
Supfina Grieshaber GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Supfina Grieshaber GmbH and Co KG filed Critical Supfina Grieshaber GmbH and Co KG
Priority to EP12186775.8A priority Critical patent/EP2712702B1/en
Priority to KR1020130114608A priority patent/KR101571212B1/en
Priority to US14/039,832 priority patent/US9221146B2/en
Priority to BR102013025046-5A priority patent/BR102013025046B1/en
Priority to CN201310456043.6A priority patent/CN103707165B/en
Publication of EP2712702A1 publication Critical patent/EP2712702A1/en
Application granted granted Critical
Publication of EP2712702B1 publication Critical patent/EP2712702B1/en
Active legal-status Critical Current
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Classifications

    • 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
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18Accessories
    • 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
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18Accessories
    • B24B21/20Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • 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
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/02Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
    • 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
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • 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
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B24B21/08Pressure shoes; Pressure members, e.g. backing belts
    • 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
    • B24B35/00Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture

Definitions

  • the invention relates to a belt finishing device, comprising a pressing device for pressing a finishing strip against a workpiece surface, wherein the pressing device comprises a pressing belt, which is mounted on two spaced in the running direction of the finishing tape arranged bearing surfaces.
  • From the EP 2 212 058 B1 is a device for finishing peripheral surfaces on cylindrical workpiece sections known.
  • This device comprises a flexurally elastic pressure band for pressing a finishing tape on peripheral surfaces of substantially cylindrical workpiece sections.
  • the workpiece surface to be machined is driven in rotation and this rotational movement is superimposed by a relative movement directed parallel to the workpiece axis between the workpiece and the finishing belt.
  • the workpiece surface is provided with a characteristic for the finishing process cross-cut structure.
  • the workpiece surfaces to be machined are, in particular, bearing surfaces of crankshafts or camshafts. These storage areas must be manufactured with a high dimensional accuracy.
  • the bearing surfaces of the crankshafts or camshafts should be made so that they ensure in conjunction with the bearing surfaces of a crankcase or camshaft housing or with the bearing surfaces of a connecting rod possible backlash-free and low-friction bearings with high wing fractions.
  • the present invention has the object to provide a belt finishing device, which allows the production of particularly dimensionally stable workpiece surfaces.
  • At least one of the bearing surfaces and / or the pressure belt has a profile that deviates in the width direction of the finishing belt of a straight-line course.
  • the pressure band is seen in the width direction of the finishing tape exposed to different tensile stresses.
  • a region with a higher tensile stress of the pressure belt a region of the finishing belt adjacent to this region is subjected to a higher pressure force.
  • regions of the lower tensile pressure belt lower-pressure regions supported on these regions are subjected to a lower pressure force. The different pressing forces cause the workpiece surface to be machined to deviate from a desired nominal contour.
  • the geometry of the workpiece surface to be machined can now be influenced, namely by designing the profile of at least one of the bearing surfaces and / or the pressure belt deviating from a rectilinear course.
  • a profile deviating from a rectilinear profile according to the invention has a predetermined shape which can not be provided by the surfaces of cylindrical bearing rollers with normal tolerances and by the pressure belts of rectangular cross section.
  • the profile according to the invention of the at least one bearing surface and / or the pressure belt preferably has at least one profile section which deviates from a mathematically ideal straight line by at least 10 micrometers, in particular by at least 20 micrometers.
  • the profile is curved.
  • the profile of the Andschreibbands is curved.
  • the curvature of the pressure belt can be designed such that the workpiece surface to be finished receives an approximately ideal cylindrical shape.
  • it is also possible to interpret the curvature of the Andschreibbands so that a workpiece surface is produced, the desired shape deviates from a cylindrical shape.
  • convex workpiece surfaces can be produced. But it is also the production of concave curved workpiece surfaces possible.
  • At least one of the bearing surfaces in the width direction of the finishing strip deviates from a straight course.
  • the profile of at least one of the bearing surfaces is curved.
  • the pressure band is applied in outer side regions with a higher voltage than in a central region.
  • a finishing belt resting against this pressing belt is subjected to a higher pressing force in outer side areas than in a central area.
  • a workpiece surface can be produced which is convex in profile, that is in a central region has a larger diameter than in outer side regions.
  • a bearing surface for supporting the Andschreibbands is consistently made of the same material to specify particularly dimensionally stable, deviating from a straight line profile and produce.
  • the pressure belt has a contact surface cooperating with the finishing belt, which is formed by only a single layer or pressing belt material. This allows the specification and production of a particularly dimensionally stable, deviating from a straight line profile of the Andrückbands.
  • the at least one bearing surface and / or the pressure belt it is possible for the at least one bearing surface and / or the pressure belt to be continuous, so that they completely support the finishing belt over its width. But it is also possible that the at least one bearing surface and / or the pressure belt has at least one interruption, so that the finishing belt is seen in the width direction, at least in the area of the interruption of the bearing surface and / or the Andrückbands acted upon with a lower pressing force. This allows a targeted influencing of the geometry of the workpiece surface in such a way that less material is removed in a rotation plane of the workpiece surface associated with the interruption of the bearing surface and / or the pressure belt than in a laterally adjacent region.
  • the interruptions may be, for example, pocket-shaped recesses and / or openings of at least one of the bearing surfaces and / or the pressure belt.
  • At least one bearing surface may have recesses or grooves running parallel to the running direction of the finishing strip. It is also possible that the bearing surface is formed by a plurality of mutually separate bearing body, wherein the bearing bodies are arranged offset to one another in the width direction of the finishing tape.
  • the pressure belt can, for example, have pocket-shaped recesses in the region of the profile deviating from a straight-line profile, so that a pressing surface facing the finishing belt is interrupted, but a rear side of the pressure belt facing away from the finishing belt is closed. It is also possible to break the Andschreibband so that the Andschreibband is interrupted not only on the back of the finishing tape adjacent the front of the Andschreibbands, but also in the region of the back of the belt facing away from the Andschreibbands.
  • At least one of the bearing surfaces is formed by a bearing roller. This allows a storage of Andrückbands over a high wrap angle.
  • a further advantageous embodiment of the invention provides that the bearing roller is mounted floating. This has the advantage that the course of the Andschreibbands and thus the course of the finishing tape is easily adaptable to workpiece surfaces with different diameters.
  • the bearing roller can be supported on a stationary bearing roller support device. This allows limitation of a degree of freedom of movement of a bearing roller.
  • At least one of the bearing surfaces is formed by a stationary bearing element.
  • a bearing element has a non-movable bearing surface. This allows a storage of Andschreibbands with very low position tolerances.
  • the pressing belt is movable relative to the bearing surfaces.
  • a fixing device for fixing the Andrückbands is provided relative to the bearing surfaces. In this way, a further improvement of the dimensional accuracy of the workpiece surface to be produced can be achieved.
  • a simpler control of the transferable in the width direction of the finishing tape by means of Andrückbands on the finishing belt pressing forces arises when the pressure belt is formed in the form of an endless belt.
  • Such a pressure belt has a front operative portion, whose front side cooperates with the back of the finishing tape.
  • Such an endless belt is deflected in the region of the mutually spaced bearing surfaces and merges into a rear portion, which is arranged spaced from the finishing belt.
  • the invention further relates to a belt finishing system comprising a belt finishing device described above and a workpiece having a workpiece surface to be finish-machined.
  • At least one of the bearing surfaces and / or the pressure belt at least one interruption, wherein the workpiece surface is interrupted in the region of a bore and wherein the position of the interruption in the width direction of the finishing tape is matched to the position of the bore.
  • Crankshafts or camshafts which have a bore, in particular an oil outlet bore, in the area of the bearing surface can be produced with such a band finishing system.
  • a rotation plane associated with such a bore is subjected to lower pressure forces during finishing machining of the workpiece surface, so that the finishing belt presses against the workpiece in the region of the boundary of the bore with a lower force than in laterally adjacent regions.
  • the profile and / or the superimposition of the two partial profiles has a stronger characteristic than the desired contour, and that the profile and / or the superimposition of both partial profiles over a working width of the finishing strip defines a circular section whose segment height is about one Factor of 1.5 to 25, preferably from 3 to 15, in particular from 5 to 10, is greater than a segment height of a circular section, which is limited over the effective width of the finishing strip of the desired contour.
  • FIG. 1 One embodiment of a belt finishing device is shown in FIG. 1 generally designated by the reference numeral 10. This is used for finishing machining of a particular rotationally symmetrical workpiece surface 12 of a workpiece 14. The finishing machining of the workpiece surface 12 is effected by means of a finishing tape 16.
  • a supply 17 is provided for the finishing belt 16.
  • the finishing belt is guided and deflected on a guiding / deflecting device 18 and lies in an operative region 20 within a Wrap angle (which is, for example, at least about 10 °) at the workpiece surface 12 at.
  • the area of action 20 is adjoined by an area 22 in which used finishing belt 16 is collected.
  • the finishing belt 16 is deflected in the region 22 and fed to a first active region 20 opposite the second effective region 24.
  • the finishing tape lies against the workpiece surface 12 within a wrapping angle (which, for example, is at least approximately 10 °).
  • a guiding / deflecting device 26 adjoins the active region 24, from which the finishing belt 16 is fed to a collecting region 28.
  • finishing machining of the workpiece 14 it is driven in rotation about a workpiece axis 36 (see FIG Fig. 2 ). This rotational movement is superimposed on a parallel to the axis of rotation 36, oscillating relative movement between the finishing belt 16 and the workpiece 14.
  • FIG. 2 shows an enlarged view of a pressing device 30. This includes two spaced bearing rollers 38, the radially outward facing surfaces bearing surfaces 40 for storing a Andschreibbands 42 have.
  • the pressure belt 42 is formed in the form of an endless belt. With a front portion 44, the pressure belt 42 cooperates with the finishing belt 16. At the front portion 44 close to the bearing surfaces 40 cooperating deflection sections 46, which merge into a rear portion 48 of the Andschreibbands 42. The rear portion 48 is spaced from the front portion 42. The rear portion 48 is supported by a Andschreibband-supporting device 50 in the region of a support surface 52. The support surface 52 acts on the rear portion 48 of the Andschreibbands 42 with a force acting in the direction of the workpiece 14 supporting force.
  • the bearing rollers 38 have mutually parallel bearing axes 54.
  • the bearing axes 54 are floating, for example by means of bearing elements 58 in the form of scenes.
  • the shape and arrangement of the bearing elements 58 (for example, the extension direction of the scenes) is such that the bearing axes 54 are movable in the radial direction to the workpiece axis 36.
  • the bearing rollers 38 are supported by a stationary bearing roller support 60.
  • the device 60 includes, for example, a support surface 62, by means of which the bearing rollers 38 are supported with the interposition of the Andrückbands 42.
  • the devices 50 and 60 may be formed integrally with each other.
  • the support surfaces 52 and 62 preferably merge continuously (kink-free) into each other.
  • the pressing device 30 is suitable for workpieces 14 with different diameters. For example, if instead of the workpiece 14 (see FIG. 2 ) a workpiece 14 'of smaller diameter (see FIG. 3 At the same time, the wrap angle of the active region 24 increases. Moreover, the bearing shafts 54 of the bearing rollers 38 continue to shift in the direction of the workpiece 14 '.
  • the bearing rollers 38 are based on the bearing axes 54 rotationally symmetrical and have in profile convex curved bearing surfaces 40 (see FIG. 4 ).
  • the bearing surface 40 serves to support a rear side 64 (cf. FIG. 6 ) of the Andschreibbands 42.
  • the pressure belt 42 has a pressing surface 66 facing away from the rear side 64, which acts on a rear side 68 of the finishing belt 16 with pressing forces, so that an active surface 70 of the finishing belt 16 provided with finish material is pressed against the workpiece surface 12 of the workpiece 14 to be finish-machined.
  • the pressing belt 42 is rectangular in cross-section in an undeformed initial state.
  • the pressure belt 42 is elastically deformable and lies in the deflection sections 46 (see FIG FIG. 2 ) with its back 64 flat on the bearing surface 40 at.
  • the pressing belt 42 deforms, so that the pressing surface 66 has a curved profile corresponding to the curvature of the bearing surface 40.
  • the curvature of the pressing surface 66 of the Andschreibbands 42 accordingly deforms the on the pressure belt 42 fitting finishing belt 16 so that the active surface 70 of the finishing belt 16 convexly curved and a concave workpiece surface 12 can be produced.
  • the bearing surfaces 40 and the pressure surface 66 of the Andschreibbands 42 thus have a curved profile which deviates in the width direction 72 of the finishing belt 16 from a straight-line course.
  • the bearing surfaces 40 of the bearing rollers 38 are concavely curved.
  • Andrückbands 42 creates a concave curved active surface 70 of the finishing belt 16, whereby a convexly curved workpiece surface 12 of the workpiece 14 can be produced.
  • a radius of curvature of a convexly curved bearing surface 40 (cf. Fig. 4 ) between about 1000 mm and about 6000 mm.
  • a chord height ie a maximum, based on a circular cylinder shape overshoot
  • 0.02 to 0.05 mm is suitable.
  • a radius of curvature of a concavely curved bearing surface 40 (cf. Fig. 7 ) is preferably between about 1000 mm and about 6000 mm.
  • a chord height ie a maximum reduction based on a circular cylinder shape
  • 0.05 mm is suitable.
  • FIG. 10c shows one of the FIG. 9 corresponding representation. According to the state FIG. 10c Previous workpiece processing phases are in the Figures 10a and 10b shown.
  • the workpiece surface 12 of the workpiece 14 is cylindrical.
  • this is initially present only with edge regions 74 at corresponding edge regions 76 of the workpiece 14.
  • These areas exert correspondingly high opposing forces 78 (cf. FIG. 11a ) on the finishing belt 16.
  • the counterforces 78 continue to distribute toward a central region 80 (see FIG FIG. 11b ) of the workpiece 14.
  • FIG. 11c a state is shown in which the workpiece surface 12 assumes a curved target contour.
  • the concave radius of curvature of the active surface 70 of the finishing tape 16 corresponds to the convex radius of curvature of the workpiece surface 12 of the workpiece 14 and the active surface 70 is located in the width direction 72 on the entire surface of the workpiece surface 12 of the workpiece 14.
  • Such bearing elements 82 are for example in Figures 16 and 22 shown in perspective.
  • the bearing elements 82 have in the area between two spaced apart Bearing surfaces 40 a the effective range 20 of the finishing belt 16 associated constriction 84.
  • the constriction 84 is so large that a front portion 44 of the pressure belt 42 arranged at the level of the effective portion 20 of the finishing belt 16 is spaced apart from the bearing element 82 by its rear side 64 and a free space 86 is created (see FIG Figures 12 and 13 ).
  • the clearance 86 forms an escape space for the front portion 44 of the Andrückbands 42 upon application of a partial circumference of a workpiece surface to be finished 12 of a workpiece 14.
  • the course of the Andrückbands 42 fits Course of the workpiece surface to be machined 12 (for example, to larger workpieces 14, see FIG. 12 and to smaller workpieces 14 ', cf. FIG. 13 ).
  • the bearing elements 82 have on their side facing away from the constriction 84 a support surface 52.
  • the fixing device 87 comprises, for example, an actuating element 88 in the form of a screw which presses a fixing element 90 against the pressing belt 42 and this against the supporting surface 52 (FIG. compare FIGS. 14 and 15 ).
  • the bearing element 82 has, for example, a one-piece bearing body 92 which extends in the width direction 72 of the finishing strip 16 (cf. FIG. 15 ) extends between opposed side surfaces 94 and 96 (see FIG FIG. 18 ).
  • the bearing body 92 may be connected, for example by means of screws 98 with holding parts 100 (see FIGS. 15 and 12 ), which serves to attach the bearing member 82 to the holders 32 (see FIG. 1 ).
  • the holding parts 100 can also be connected to a frame 102 (cf. Figures 12 and 13 ), which in turn is connected to a holder 32.
  • the bearing surfaces 40 of the bearing element 82 a straight-line course. These bearing surfaces 40 correspond between their transition to the constriction 84 and to the support surface 52 surface portions of a cylinder jacket. These bearing surfaces 40 are used for mounting a Andschreibbands 42, the pressing surface 66 is curved in profile, in particular concavely curved (see FIG. 15 ).
  • the support surface 52 of the bearing element 82 according to FIGS. 16 to 21 preferably extends in a straight plane.
  • FIGS. 22 to 27 illustrated embodiment of a bearing member 82 and a Andschreibbands 42 for use in a pressing device 30 according to FIGS. 12 to 15 the bearing surfaces 40 a curved profile, in particular a concave curved profile, on.
  • Such bearing elements 82 may in particular, as in FIGS. 25 to 27 represented, together with a Andschreibband 42 are used, which has a rectangular cross section with a straight-profiled Andschreib components 66 in an undeformed initial state, are used.
  • the shape of the curvature of the bearing surface 40 transmits to the pressing surface 66 and on the Finishing belt 16 and on the workpiece surface to be machined 12th
  • bearing element 82 according to FIGS. 22 to 24 to use together with a Andschreibband 42, which has a curved in profile pressure surface 66 (such a pressure belt 42 is, for example, in FIG. 21 shown).
  • the Andschreibb sections 42 according to FIGS. 28 to 33 have in contrast to the above-described Andschreibb sectionsn 42 openings 104, which are arranged in particular at the level of the constriction 84 and thus at the height of the effective region 20 of the finishing belt 16. It is possible that only one aperture 104 (cf. FIG. 29 ) is provided. It is also possible that a plurality of apertures 104 are provided (see FIG. 32 ).
  • the apertures 104 have an extension in the width direction 72 of the finishing tape 16 and an extension in the running direction 106 of the finishing tape 16.
  • this may preferably be formed substantially elliptical or diamond-shaped.
  • FIG. 34 shows an enlarged illustrated target contour 108 of a workpiece 14, which is applied across the width direction 72 of the finishing belt 16.
  • the desired contour 108 deviates from a circular cylindrical shape 110, namely by divergent workpiece material removal 112.
  • the largest workpiece material removal 112 results for outer setpoint contour sections A, smaller workpiece material removal for the desired contour sections B, in turn smaller workpiece material removal for the desired contour sections C and no or only a slight material removal for a desired contour section D.
  • a pressing belt 42 is provided, which seen in the width direction 72 of the finishing belt 16 has successive band sections (ABCDCBA).
  • a band section D which corresponds to a desired contour section D of the target contour 108 of the workpiece 14 is provided with an interruption 104 ', which is longer in the direction 106 of the finishing strip 16 than interruptions 104 ", which band sections C are assigned. which correspond with corresponding desired contour sections with larger material removal rates 112.
  • FIG. 35 wherein mutually adjacent interruptions 104, 104 ', 104 ", 104"' together form a continuous interruption 104.
  • the interruptions 104, 104 ', 104 ", 104"' but also be provided separately.
  • the desired contour 108 of a workpiece 14 can also be described in the form of a particularly continuous and kink-free function, as in FIG. 36 indicated by a coordinate system.
  • a function is a circular function or a logarithm.
  • the course 114 of an opening 104 can then be determined (cf. FIG. 37 ).
  • interruptions 104 is achieved that seen in the width direction 72 of the finishing belt 16 different material removal rates 112 can be realized. Since the pressing belt 42 has a longer interruption in a central portion D in the running direction 106, the finishing belt 16 is pressed in this area with a lower voltage to the workpiece 12, so that there takes place a smaller material removal. On the other hand, the perforations in lateral strip sections (for example in strip sections B) are shorter in the running direction 106 of the finishing strip 16, so that in these strip sections the pressing strip 42 is pressed with greater force against the finishing strip 16 and a higher material removal takes place in these areas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft eine Bandfinishvorrichtung, umfassend eine Andrückeinrichtung zum Andrücken eines Finishbands gegen eine Werkstückoberfläche, wobei die Andrückeinrichtung ein Andrückband umfasst, welches an zwei in Laufrichtung des Finishbands gesehen zueinander beabstandet angeordneten Lagerflächen gelagert ist.The invention relates to a belt finishing device, comprising a pressing device for pressing a finishing strip against a workpiece surface, wherein the pressing device comprises a pressing belt, which is mounted on two spaced in the running direction of the finishing tape arranged bearing surfaces.

Aus der EP 2 212 058 B1 ist eine Vorrichtung zur Finishbearbeitung von Umfangsflächen an zylindrischen Werkstückabschnitten bekannt. Diese Vorrichtung umfasst ein biegeelastisches Andrückband zum Andrücken eines Finishbands an Umfangsflächen von im Wesentlichen zylindrischen Werkstückabschnitten.From the EP 2 212 058 B1 is a device for finishing peripheral surfaces on cylindrical workpiece sections known. This device comprises a flexurally elastic pressure band for pressing a finishing tape on peripheral surfaces of substantially cylindrical workpiece sections.

Bei der Finishbearbeitung wird die zu bearbeitende Werkstückoberfläche rotierend angetrieben und dieser Rotationsbewegung eine parallel zur Werkstückachse gerichtete Relativbewegung zwischen dem Werkstück und dem Finishband überlagert. Hierdurch wird die Werkstückoberfläche mit einer für das Finishverfahren charakteristischen Kreuzschliffstruktur versehen.During finish machining, the workpiece surface to be machined is driven in rotation and this rotational movement is superimposed by a relative movement directed parallel to the workpiece axis between the workpiece and the finishing belt. As a result, the workpiece surface is provided with a characteristic for the finishing process cross-cut structure.

Bei den zu bearbeitenden Werkstückoberflächen handelt es sich insbesondere um Lagerflächen von Kurbel- oder Nockenwellen. Diese Lagerflächen müssen mit einer hohen Maßhaltigkeit gefertigt werden. Insbesondere sollen die Lagerflächen der Kurbel- oder Nockenwellen so gefertigt sein, dass sie im Zusammenspiel mit den Lagerflächen eines Kurbel- oder Nockenwellengehäuses oder mit den Lagerflächen eines Pleuels möglichst spielfreie und reibungsarme Lagerungen mit hohen Tragflächenanteilen gewährleisten.The workpiece surfaces to be machined are, in particular, bearing surfaces of crankshafts or camshafts. These storage areas must be manufactured with a high dimensional accuracy. In particular, the bearing surfaces of the crankshafts or camshafts should be made so that they ensure in conjunction with the bearing surfaces of a crankcase or camshaft housing or with the bearing surfaces of a connecting rod possible backlash-free and low-friction bearings with high wing fractions.

Es hat sich herausgestellt, dass mit den bekannten Bandfinishvorrichtungen die vorstehend genannten Anforderungen nicht optimal erfüllbar sind. Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Bandfinishvorrichtung zu schaffen, welche die Herstellung besonders maßhaltiger Werkstückoberflächen ermöglicht.It has been found that with the known Bandfinishvorrichtungen the above requirements are not optimally fulfilled. On this basis, the present invention has the object to provide a belt finishing device, which allows the production of particularly dimensionally stable workpiece surfaces.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass mindestens eine der Lagerflächen und/oder das Andrückband ein Profil aufweist, das in Breitenrichtung des Finishbands von einem geradlinigen Verlauf abweicht.This object is achieved in that at least one of the bearing surfaces and / or the pressure belt has a profile that deviates in the width direction of the finishing belt of a straight-line course.

Erfindungsgemäß wurde Folgendes erkannt: bei Verwendung von aus dem Stand der Technik bekannten Lagerflächen, welche in Breitenrichtungen des Finishbands ein geradliniges Profil aufweisen (also beispielsweise bei Verwendung zylindrischer Lagerrollen und eines im Profil rechteckigen Andrückbands), ist das Andrückband in Breitenrichtung des Finishbands gesehen unterschiedlichen Zugspannungen ausgesetzt. In einem Bereich mit einer höheren Zugspannung des Andrückbands wird ein an diesen Bereich anliegender Bereich des Finishbands mit einer höheren Andrückkraft beaufschlagt. In Bereichen des Andrückbands mit niedrigerer Zugspannung werden an diesen Bereichen abgestützte Finishbandbereiche mit einer niedrigeren Andrückkraft beaufschlagt. Die unterschiedlichen Andrückkräfte bewirken, dass die zu bearbeitende Werkstückoberfläche von einer gewünschten Soll-Kontur abweicht.According to the invention, the following has been recognized: when using bearing surfaces known from the prior art, which in the width directions of the finishing strip a straight-line profile have (that is, for example, when using cylindrical bearing rollers and a profile in the rectangular Andrückbands), the pressure band is seen in the width direction of the finishing tape exposed to different tensile stresses. In a region with a higher tensile stress of the pressure belt, a region of the finishing belt adjacent to this region is subjected to a higher pressure force. In regions of the lower tensile pressure belt, lower-pressure regions supported on these regions are subjected to a lower pressure force. The different pressing forces cause the workpiece surface to be machined to deviate from a desired nominal contour.

Erfindungsgemäß ist nun die Geometrie der zu bearbeitenden Werkstückoberfläche beeinflussbar, nämlich indem das Profil mindestens einer der Lagerflächen und/oder des Andrückbands von einem geradlinigen Verlauf abweichend ausgebildet ist. Ein erfindungsgemäßes, von einem geradlinigen Verlauf abweichendes Profil weist eine vorgegebene Form auf, welche von den mit üblichen Toleranzen behafteten Oberflächen von zylindrischen Lagerrollen und von den Andrückbändern mit rechteckigem Querschnitt nicht bereitgestellt werden können.According to the invention, the geometry of the workpiece surface to be machined can now be influenced, namely by designing the profile of at least one of the bearing surfaces and / or the pressure belt deviating from a rectilinear course. A profile deviating from a rectilinear profile according to the invention has a predetermined shape which can not be provided by the surfaces of cylindrical bearing rollers with normal tolerances and by the pressure belts of rectangular cross section.

Vorzugsweise weist das erfindungsgemäße Profil der mindestens einen Lagerfläche und/oder des Andrückbands mindestens einen Profilabschnitt auf, der um mindestens 10 Mikrometer, insbesondere um mindestens 20 Mikrometer von einer mathematisch idealen Geraden abweicht.The profile according to the invention of the at least one bearing surface and / or the pressure belt preferably has at least one profile section which deviates from a mathematically ideal straight line by at least 10 micrometers, in particular by at least 20 micrometers.

Insbesondere ist es bevorzugt, dass das Profil gekrümmt ist. Beispielsweise ist das Profil des Andrückbands gekrümmt. Durch die Anlage des im Profil gekrümmten Andrückbands an das Finishband wird auch das Finishband in entsprechender Weise gekrümmt, und zwar um eine parallel zur Laufrichtung des Finishbands verlaufende Krümmungsachse. Auf diese Weise kann die Geometrie der zu finishenden Werkstückoberfläche gezielt beeinflusst werden. Beispielsweise kann die Krümmung des Andrückbands derart ausgelegt sein, dass die zu finishende Werkstückoberfläche eine annähernd ideale zylindrische Form erhält. Es ist aber auch möglich, die Krümmung des Andrückbands so auszulegen, dass eine Werkstückoberfläche hergestellt wird, deren Soll-Form von einer Zylinderform abweicht. Insbesondere können konvexe Werkstückoberflächen hergestellt werden. Es ist aber auch die Herstellung von konkav gekrümmten Werkstückoberflächen möglich.In particular, it is preferred that the profile is curved. For example, the profile of the Andrückbands is curved. By the plant of curved in the profile Andrückbands to the finishing tape and the finishing tape in curved accordingly, namely about a direction parallel to the running direction of the finishing strip axis of curvature. In this way, the geometry of the workpiece surface to be punched can be influenced in a targeted manner. For example, the curvature of the pressure belt can be designed such that the workpiece surface to be finished receives an approximately ideal cylindrical shape. But it is also possible to interpret the curvature of the Andrückbands so that a workpiece surface is produced, the desired shape deviates from a cylindrical shape. In particular, convex workpiece surfaces can be produced. But it is also the production of concave curved workpiece surfaces possible.

Es ist auch möglich, dass mindestens eine der Lagerflächen in Breitenrichtung des Finishbands von einem geradlinigen Verlauf abweicht. Beispielsweise ist das Profil mindestens einer der Lagerflächen gekrümmt. Wenn beispielsweise mindestens eine der Lagerflächen konkav gekrümmt ist, wird das Andrückband in außenliegenden Seitenbereichen mit einer höheren Spannung beaufschlagt als in einem zentralen Bereich. Hierdurch wird ein an dieses Andrückband anliegendes Finishband in außenliegenden Seitenbereichen mit einer höheren Andrückkraft beaufschlagt als in einem zentralen Bereich. Auf diese Weise kann eine Werkstückoberfläche hergestellt werden, welche im Profil konvex ist, also in einem zentralen Bereich einen größeren Durchmesser aufweist als in außenliegenden Seitenbereichen.It is also possible that at least one of the bearing surfaces in the width direction of the finishing strip deviates from a straight course. For example, the profile of at least one of the bearing surfaces is curved. For example, if at least one of the bearing surfaces is concavely curved, the pressure band is applied in outer side regions with a higher voltage than in a central region. As a result, a finishing belt resting against this pressing belt is subjected to a higher pressing force in outer side areas than in a central area. In this way, a workpiece surface can be produced which is convex in profile, that is in a central region has a larger diameter than in outer side regions.

Es können auch beide der vorstehend beschriebenen Möglichkeiten (mindestens eine gekrümmte Lagerfläche; im Profil gekrümmtes Andrückband) miteinander kombiniert werden.It is also possible to combine both of the possibilities described above (at least one curved bearing surface, curved pressure band in profile).

Im Rahmen der Erfindung ist es bevorzugt, dass eine Lagerfläche zur Lagerung des Andrückbands durchgängig aus demselben Material hergestellt ist, um besonders maßhaltige, von einem geradlinigen Verlauf abweichende Profile vorgeben und herstellen zu können.In the context of the invention, it is preferable that a bearing surface for supporting the Andrückbands is consistently made of the same material to specify particularly dimensionally stable, deviating from a straight line profile and produce.

In entsprechender Weise ist es bevorzugt, dass das Andrückband eine mit dem Finishband zusammenwirkende Andrückfläche aufweist, welche von nur einem einzigen Schicht- oder Andrückbandmaterial gebildet ist. Dies ermöglicht die Vorgabe und Herstellung eines besonders maßhaltigen, von einem geradlinigen Verlauf abweichenden Profils des Andrückbands.In a corresponding manner, it is preferred that the pressure belt has a contact surface cooperating with the finishing belt, which is formed by only a single layer or pressing belt material. This allows the specification and production of a particularly dimensionally stable, deviating from a straight line profile of the Andrückbands.

Erfindungsgemäß ist es möglich, dass die mindestens eine Lagerfläche und/oder das Andrückband durchgängig sind, sodass sie das Finishband über dessen Breite hinweg vollständig abstützen. Es ist aber auch möglich, dass die mindestens eine Lagerfläche und/oder das Andrückband mindestens eine Unterbrechung aufweist, sodass das Finishband in Breitenrichtung gesehen zumindest im Bereich der Unterbrechung der Lagerfläche und/oder des Andrückbands mit einer niedrigeren Andrückkraft beaufschlagt ist. Dies ermöglicht eine gezielte Beeinflussung der Geometrie der Werkstückoberfläche dahingehend, dass in einer der Unterbrechung der Lagerfläche und/oder des Andrückbands zugeordneten Rotationsebene der Werkstückoberfläche weniger Material abgetragen wird als in einem hierzu seitlich benachbarten Bereich.According to the invention, it is possible for the at least one bearing surface and / or the pressure belt to be continuous, so that they completely support the finishing belt over its width. But it is also possible that the at least one bearing surface and / or the pressure belt has at least one interruption, so that the finishing belt is seen in the width direction, at least in the area of the interruption of the bearing surface and / or the Andrückbands acted upon with a lower pressing force. This allows a targeted influencing of the geometry of the workpiece surface in such a way that less material is removed in a rotation plane of the workpiece surface associated with the interruption of the bearing surface and / or the pressure belt than in a laterally adjacent region.

Bei den Unterbrechungen kann es sich beispielsweise um taschenförmige Ausnehmungen und/oder um Durchbrüche mindestens einer der Lagerflächen und/oder des Andrückbands handeln.The interruptions may be, for example, pocket-shaped recesses and / or openings of at least one of the bearing surfaces and / or the pressure belt.

Beispielsweise kann mindestens eine Lagerfläche parallel zur Laufrichtung des Finishbands verlaufende Vertiefungen oder Rillen aufweisen. Es ist auch möglich, dass die Lagerfläche durch mehrere, voneinander getrennte Lagerkörper gebildet ist, wobei die Lagerkörper in Breitenrichtung des Finishbands zueinander versetzt angeordnet sind.For example, at least one bearing surface may have recesses or grooves running parallel to the running direction of the finishing strip. It is also possible that the bearing surface is formed by a plurality of mutually separate bearing body, wherein the bearing bodies are arranged offset to one another in the width direction of the finishing tape.

Das Andrückband kann beispielsweise im Bereich des von einem geradlinigen Verlauf abweichenden Profils taschenförmige Ausnehmungen aufweisen, sodass eine dem Finishband zugewandte Andrückfläche unterbrochen, jedoch eine dem Finishband abgewandte Rückseite des Andrückbands geschlossen ist. Es ist auch möglich, das Andrückband zu durchbrechen, sodass das Andrückband nicht nur an der Rückseite des Finishbands anliegenden Vorderseite des Andrückbands, sondern auch im Bereich der dem Finishband abgewandten Rückseite des Andrückbands unterbrochen ist.The pressure belt can, for example, have pocket-shaped recesses in the region of the profile deviating from a straight-line profile, so that a pressing surface facing the finishing belt is interrupted, but a rear side of the pressure belt facing away from the finishing belt is closed. It is also possible to break the Andrückband so that the Andrückband is interrupted not only on the back of the finishing tape adjacent the front of the Andrückbands, but also in the region of the back of the belt facing away from the Andrückbands.

Bei einer bevorzugten Ausführungsform ist vorgesehen, dass mindestens eine der Lagerflächen von einer Lagerrolle gebildet ist. Diese ermöglicht eine Lagerung des Andrückbands über einen hohen Umschlingungswinkel.In a preferred embodiment it is provided that at least one of the bearing surfaces is formed by a bearing roller. This allows a storage of Andrückbands over a high wrap angle.

Eine weitere vorteilhafte Ausführungsform der Erfindung sieht vor, dass die Lagerrolle schwimmend gelagert ist. Dies hat den Vorteil, dass der Verlauf des Andrückbands und somit der Verlauf des Finishbands in einfacher Weise an Werkstückoberflächen mit unterschiedlichen Durchmessern anpassbar ist.A further advantageous embodiment of the invention provides that the bearing roller is mounted floating. This has the advantage that the course of the Andrückbands and thus the course of the finishing tape is easily adaptable to workpiece surfaces with different diameters.

Bevorzugt ist es ferner, wenn es die Lagerrolle auf einer stationären Lagerrollen-Abstützeinrichtung abstützbar ist. Dies ermöglicht eine Begrenzung eines Bewegungsfreiheitsgrads einer Lagerrolle.It is also preferred if the bearing roller can be supported on a stationary bearing roller support device. This allows limitation of a degree of freedom of movement of a bearing roller.

Es ist auch möglich, dass mindestens eine der Lagerflächen von einem stationären Lagerelement gebildet ist. Ein solches Lagerelement weist eine unbewegbare Lagerfläche auf. Dies ermöglicht eine Lagerung des Andrückbands mit besonders niedrigen Lagetoleranzen.It is also possible that at least one of the bearing surfaces is formed by a stationary bearing element. Such a bearing element has a non-movable bearing surface. This allows a storage of Andrückbands with very low position tolerances.

Es ist möglich, dass das Andrückband relativ zu den Lagerflächen bewegbar ist. Es kann jedoch bevorzugt sein, wenn eine Fixiereinrichtung zur Fixierung des Andrückbands relativ zu den Lagerflächen vorgesehen ist. Hierdurch kann eine weitere Verbesserung der Maßhaltigkeit der herzustellenden Werkstückoberfläche erreicht werden.It is possible that the pressing belt is movable relative to the bearing surfaces. However, it may be preferred if a fixing device for fixing the Andrückbands is provided relative to the bearing surfaces. In this way, a further improvement of the dimensional accuracy of the workpiece surface to be produced can be achieved.

Es ist denkbar, ein Andrückband vorzusehen, dessen dem Finishband abgewandte Rückseite ein Profil aufweist, das von einem geradlinigen Verlauf abweicht. Bevorzugt ist es jedoch, wenn zumindest die Andrückfläche des Andrückbands ein Profil aufweist, das von einem geradlinigen Verlauf abweicht. Insbesondere weist nur die Andrückfläche des Andrückbands ein Profil auf, das von einem geradlinigen Verlauf abweicht.It is conceivable to provide a pressure belt whose rear side facing away from the finishing belt has a profile which deviates from a rectilinear course. However, it is preferred if at least the pressing surface of the Andrückbands has a profile that deviates from a straight-line course. In particular, only the pressing surface of the Andrückbands has a profile that deviates from a straight-line course.

Eine einfachere Kontrolle der in Breitenrichtung des Finishbands mittels des Andrückbands auf das Finishband übertragbaren Andrückkräfte ergibt sich, wenn das Andrückband in Form eines Endlosband ausgebildet ist. Ein solches Andrückband weist einen vorderen Wirkabschnitt auf, dessen Vorderseite mit der Rückseite des Finishbands zusammenwirkt. Ein solches Endlosband wird im Bereich der zueinander beabstandet angeordneten Lagerflächen umgelenkt und geht in einen rückwärtigen Abschnitt über, welcher zu dem Finishband beabstandet angeordnet ist.A simpler control of the transferable in the width direction of the finishing tape by means of Andrückbands on the finishing belt pressing forces arises when the pressure belt is formed in the form of an endless belt. Such a pressure belt has a front operative portion, whose front side cooperates with the back of the finishing tape. Such an endless belt is deflected in the region of the mutually spaced bearing surfaces and merges into a rear portion, which is arranged spaced from the finishing belt.

Bevorzugt ist es, wenn ein rückwärtiger Abschnitt des Andrückbands mittels einer Andrückband-Abstützeinrichtung abstützbar oder abgestützt ist. Hierdurch wird eine weitere Möglichkeit geschaffen, die Spannung des Andrückbands entlang der Breite des Finishbands zu beeinflussen.It is preferred if a rear portion of the Andrückbands is supported or supported by means of a Andrückband-supporting device. As a result, a further possibility is created to influence the tension of the pressure belt along the width of the finishing belt.

Die Erfindung betrifft ferner ein Bandfinishsystem, welche eine vorstehend beschriebene Bandfinishvorrichtung und ein Werkstück mit einer finishend zu bearbeitenden Werkstückoberfläche umfasst.The invention further relates to a belt finishing system comprising a belt finishing device described above and a workpiece having a workpiece surface to be finish-machined.

Erfindungsgemäß weist mindestens eine der Lagerflächen und/oder das Andrückband mindestens eine Unterbrechung auf, wobei auch die Werkstückoberfläche im Bereich einer Bohrung unterbrochen ist und wobei die Lage der Unterbrechung in Breitenrichtung des Finishbands auf die Lage der Bohrung abgestimmt ist. Mit einem solchen Bandfinishsystem können Kurbel- oder Nockenwellen hergestellt werden, welche im Bereich der Lagerfläche eine Bohrung, insbesondere eine Ölaustrittsbohrung, aufweisen. Eine einer solchen Bohrung zugeordnete Rotationsebene wird während der finishenden Bearbeitung der Werkstückoberfläche mit niedrigeren Andrückkräften beaufschlagt, sodass das Finishband im Bereich der Berandung der Bohrung mit einer niedrigeren Kraft gegen das Werkstück drückt als in hierzu seitlich benachbarten Bereichen. Auf diese Weise kann ein zu tiefes Eindringen des Finishbands in die Bohrung und somit ein zu starker Materialabtrag im Bereich der Berandung der Bohrung verhindert werden. Dies hat den Vorteil, dass ein im Bereich der Bohrung ohnehin mechanisch geschwächter Werkstückabschnitt nicht noch weiter geschwächt wird und dass trotz einer solchen Bohrung Lagerflächen mit einem vergleichsweise hohen Tragflächenanteil geschaffen werden können.According to the invention, at least one of the bearing surfaces and / or the pressure belt at least one interruption, wherein the workpiece surface is interrupted in the region of a bore and wherein the position of the interruption in the width direction of the finishing tape is matched to the position of the bore. Crankshafts or camshafts which have a bore, in particular an oil outlet bore, in the area of the bearing surface can be produced with such a band finishing system. A rotation plane associated with such a bore is subjected to lower pressure forces during finishing machining of the workpiece surface, so that the finishing belt presses against the workpiece in the region of the boundary of the bore with a lower force than in laterally adjacent regions. In this way, too deep penetration of the finishing tape into the bore and thus excessive material removal in the region of the bore of the bore can be prevented. This has the advantage that a workpiece section which is in any case mechanically weakened in the region of the bore is not further weakened and that, in spite of such a bore, bearing surfaces with a comparatively high aerofoil proportion can be created.

Die Erfindung betrifft auch ein Verfahren zur Herstellung einer vorstehend beschriebenen Bandfinishvorrichtung, bei welchem die Soll-Kontur einer gefinishten Werkstückoberfläche ermittelt wird und wobei zusätzlich mindestens eine der folgenden Maßnahmen durchgeführt wird:

  • mindestens eine der Lagerflächen oder eine dem Finishband zugewandte Andrückfläche des Andrückbands wird mit einem Profil versehen, das zu der Soll-Kontur identisch ist oder eine stärkere Ausprägung aufweist;
  • mindestens eine der Lagerflächen und eine dem Finishband zugewandte Andrückfläche des Andrückbands wird jeweils mit einem Teilprofil versehen, wobei eine Überlagerung beider Teilprofile zu der Soll-Kontur identisch ist oder eine stärkere Ausprägung aufweist;
  • es werden Soll-Kontur-Abschnitte definiert und für jeden der Soll-Kontur-Abschnitte ein von einer Kreiszylinderform abweichender Werkstück-Materialabtrag ermittelt; mindestens eine der Lagerflächen und/oder das Andrückband wird mit mindestens einer Unterbrechung versehen, wobei die Unterbrechung einem Soll-Kontur-Abschnitt zugeordnet wird, dessen Werkstück-Materialabtrag kleiner ist als der Werkstück-Materialabtrag eines benachbarten Soll-Kontur-Abschnitts;
  • es werden Soll-Kontur-Abschnitte definiert und für jeden der Soll-Kontur-Abschnitte ein von einer Kreiszylinderform abweichender Werkstück-Materialabtrag ermittelt; mindestens eine der Lagerflächen und/oder das Andrückband wird mit Unterbrechungen versehen, welche jeweils einem Soll-Kontur-Abschnitt zugeordnet sind, wobei die Unterbrechungen in Laufrichtung des Finishbands gemessene, unterschiedliche Längen aufweisen und Unterbrechungen mit kleineren Längen Soll-Kontur-Abschnitten mit höheren Materialabtragsraten und Unterbrechungen mit größeren Längen Soll-Kontur-Abschnitten mit niedrigeren Materialabtragsraten zugeordnet werden.
The invention also relates to a method for producing a belt finishing device described above, in which the desired contour of a finished workpiece surface is determined and in addition at least one of the following measures is carried out:
  • at least one of the bearing surfaces or a pressure surface of the Andrückbands facing the finishing belt is provided with a profile which is identical to the desired contour or has a stronger characteristic;
  • at least one of the bearing surfaces and a pressure surface of the Andrückbands facing the finishing belt is in each case provided with a partial profile, with an overlapping of the two partial profiles being identical to the desired contour or having a stronger characteristic;
  • Target contour sections are defined and a workpiece material removal deviating from a circular cylinder shape is determined for each of the target contour sections; at least one of the bearing surfaces and / or the pressure belt is provided with at least one interruption, wherein the interruption is assigned to a desired contour section whose workpiece material removal is smaller than the workpiece material removal of an adjacent target contour section;
  • Target contour sections are defined and a workpiece material removal deviating from a circular cylinder shape is determined for each of the target contour sections; At least one of the bearing surfaces and / or the pressure belt is provided with interruptions, each one Target discontinuity sections are assigned, with the interruptions in the running direction of the finishing tape measured, different lengths and interruptions with smaller lengths Soll contour sections with higher material removal rates and interruptions with longer lengths Soll contour sections with lower material removal rates are assigned.

Bevorzugt ist es insbesondere, dass das Profil und/oder die Überlagerung beider Teilprofile eine stärkere Ausprägung aufweist als die Soll-Kontur, und dass das Profil und/oder die Überlagerung beider Teilprofile über eine Wirkbreite des Finishbands gesehen einen Kreisabschnitt begrenzt, dessen Segmenthöhe um einen Faktor von 1,5 bis 25, vorzugsweise von 3 bis 15, insbesondere von 5 bis 10, größer ist als eine Segmenthöhe eines Kreisabschnitts, der über die Wirkbreite des Finishbands gesehen von der Soll-Kontur begrenzt ist.It is preferred in particular that the profile and / or the superimposition of the two partial profiles has a stronger characteristic than the desired contour, and that the profile and / or the superimposition of both partial profiles over a working width of the finishing strip defines a circular section whose segment height is about one Factor of 1.5 to 25, preferably from 3 to 15, in particular from 5 to 10, is greater than a segment height of a circular section, which is limited over the effective width of the finishing strip of the desired contour.

Vorteile und Ausgestaltungen der erfindungsgemäßen Verfahren sowie weitere Merkmale und Vorteile der Erfindung sind Gegenstand der nachfolgenden Beschreibung und der zeichnerischen Darstellung bevorzugter Ausführungsformen.Advantages and embodiments of the inventive method and further features and advantages of the invention are the subject of the following description and the drawings of preferred embodiments.

In der Zeichnung zeigen:

Figur 1
eine Seitenansicht einer Ausführungsform einer Bandfinishvorrichtung;
Figur 2
eine Seitenansicht eines Teils der Bandfinishvorrichtung gemäß Fig. 1 in vergrößerter Darstellung, wobei ein erstes Werkstück mit einem ersten Durchmesser dargestellt ist;
Figur 3
eine der Fig. 2 entsprechende Ansicht, wobei ein zweites Werkstück mit einem im Vergleich zu dem ersten Durchmesser kleineren zweiten Durchmesser dargestellt ist;
Figur 4
eine Ansicht längs einer in Fig. 2 mit IV - IV bezeichneten Schnittlinie;
Figur 5
eine Ansicht längs einer in Fig. 2 mit V - V bezeichneten Schnittlinie;
Figur 6
einen in Fig. 5 mit VI bezeichneten Ausschnitt in vergrößerter Darstellung;
Figur 7
eine der Fig. 4 entsprechende Ansicht einer weiteren Ausführungsform;
Figur 8
eine der Fig. 5 entsprechende Ansicht der Ausführungsform gemäß Fig. 7;
Figur 9
eine der Fig. 6 entsprechende Ansicht der Ausführungsform gemäß Fig. 7;
Figur 10a bis 10c
der Fig. 9 entsprechende Ansichten in aufeinander folgenden Werkstückbearbeitungsphasen;
Figur 11a bis 11c
jeweils mit den aufeinander folgenden Werkstückbearbeitungsphasen gemäß Fig. 10 bis 10c korrespondierende Kräfteverläufe;
Figur 12
eine Seitenansicht einer weiteren Ausführungsform einer Bandfinishvorrichtung, wobei ein erstes Werkstück mit einem ersten Durchmesser dargestellt ist;
Figur 13
eine der Fig. 12 entsprechende Ansicht, wobei ein zweites Werkstück mit einem im Vergleich zu dem ersten Durchmesser kleineren zweiten Durchmesser dargestellt ist;
Figur 14
eine Ansicht längs einer in Fig. 12 mit XIV - XIV bezeichneten Schnittlinie;
Figur 15
einen in Fig. 14 mit XV bezeichneten Ausschnitt in vergrößerter Darstellung;
Figur 16
eine perspektivische Ansicht einer Ausführungsform eines Lagerelements zur Verwendung bei der Bandfinishvorrichtung gemäß Fig. 12;
Figur 17
eine Seitenansicht des Lagerelements gemäß Fig. 16;
Figur 18
eine Draufsicht des Lagerelements gemäß Fig. 16;
Figur 19
eine der Fig. 17 entsprechende Ansicht bei Verwendung eines Andrückbands, welches ein gekrümmtes Profil aufweist;
Figur 20
eine Vorderansicht der Anordnung gemäß Fig. 19;
Figur 21
eine Ansicht der Anordnung gemäß Fig. 19 längs einer in Fig. 19 mit XXI - XXI bezeichneten Schnittlinie;
Figur 22
eine perspektivische Ansicht einer weiteren Ausführungsform eines Lagerelements zur Verwendung bei der Bandfinishvorrichtung gemäß Fig. 12;
Figur 23
eine Seitenansicht des Lagerelements gemäß Fig. 22;
Figur 24
eine Draufsicht des Lagerelements gemäß Fig. 22;
Figur 25
eine der Fig. 23 entsprechende Ansicht bei Verwendung eines Andrückbands, welches in einem unmontierten Zustand ein geradliniges Profil aufweist;
Figur 26
eine Vorderansicht der Anordnung gemäß Fig. 25;
Figur 27
eine Ansicht der Anordnung gemäß Fig. 25 längs einer in Fig. 25 mit XXVII - XXVII bezeichneten Schnittlinie;
Figur 28
eine Seitenansicht einer weiteren Ausführungsform einer Anordnung mit einem Lagerelement und einem Andrückband;
Figur 29
eine Vorderansicht der Anordnung gemäß Fig. 28;
Figur 30
eine Ansicht der Anordnung gemäß Fig. 28 längs einer in Fig. 28 mit XXX - XXX bezeichneten Schnittlinie;
Figur 31
eine Seitenansicht einer weiteren Ausführungsform einer Anordnung mit einem Lagerelement und einem Andrückband;
Figur 32
eine Vorderansicht der Anordnung gemäß Fig. 31;
Figur 33
eine Ansicht der Anordnung gemäß Fig. 31 längs einer in Fig. 31 mit XXXIII - XXXIII bezeichneten Schnittlinie;
Figur 34
eine schematische Ansicht eines Beispiels für eine Soll-Kontur einer Werkstückoberfläche;
Figur 35
eine Vorderansicht einer Ausführungsform eines Andrückbands zur Herstellung einer Soll-Kontur gemäß Fig. 34;
Figur 36
eine schematische Ansicht eines weiteren Beispiels für eine Soll-Kontur einer Werkstückoberfläche; und
Figur 37
eine Vorderansicht einer Ausführungsform eines Andrückbands zur Herstellung einer Soll-Kontur gemäß Fig. 36.
In the drawing show:
FIG. 1
a side view of an embodiment of a belt finishing device;
FIG. 2
a side view of a portion of the belt finishing device according to Fig. 1 in an enlarged view, wherein a first Workpiece is shown with a first diameter;
FIG. 3
one of the Fig. 2 corresponding view, wherein a second workpiece is shown with a smaller compared to the first diameter second diameter;
FIG. 4
a view along an in Fig. 2 with IV - IV designated section line;
FIG. 5
a view along an in Fig. 2 with V - V designated cutting line;
FIG. 6
one in Fig. 5 with VI designated section in an enlarged view;
FIG. 7
one of the Fig. 4 corresponding view of another embodiment;
FIG. 8
one of the Fig. 5 corresponding view of the embodiment according to Fig. 7 ;
FIG. 9
one of the Fig. 6 corresponding view of the embodiment according to Fig. 7 ;
FIGS. 10a to 10c
of the Fig. 9 corresponding views in successive workpiece machining phases;
FIGS. 11a to 11c
in each case with the successive workpiece machining phases according to Fig. 10 to 10c corresponding courses of forces;
FIG. 12
a side view of another embodiment of a belt finishing device, wherein a first workpiece is shown with a first diameter;
FIG. 13
one of the Fig. 12 corresponding view, wherein a second workpiece is shown with a smaller compared to the first diameter second diameter;
FIG. 14
a view along an in Fig. 12 Section XIV - XIV;
FIG. 15
one in Fig. 14 with XV designated section in an enlarged view;
FIG. 16
a perspective view of an embodiment of a bearing element for use in the belt finishing according to Fig. 12 ;
FIG. 17
a side view of the bearing element according to Fig. 16 ;
FIG. 18
a plan view of the bearing element according to Fig. 16 ;
FIG. 19
one of the Fig. 17 corresponding view when using a Andrückbands having a curved profile;
FIG. 20
a front view of the arrangement according to Fig. 19 ;
FIG. 21
a view of the arrangement according to Fig. 19 along a in Fig. 19 with XXI - XXI cutting line;
FIG. 22
a perspective view of another embodiment of a bearing element for use in the belt finishing according to Fig. 12 ;
FIG. 23
a side view of the bearing element according to Fig. 22 ;
FIG. 24
a plan view of the bearing element according to Fig. 22 ;
FIG. 25
one of the Fig. 23 corresponding view when using a Andrückbands, which has a straight profile in an unmounted state;
FIG. 26
a front view of the arrangement according to Fig. 25 ;
FIG. 27
a view of the arrangement according to Fig. 25 along a in Fig. 25 with XXVII - XXVII designated section line;
FIG. 28
a side view of another embodiment of an arrangement with a bearing element and a pressure belt;
FIG. 29
a front view of the arrangement according to Fig. 28 ;
FIG. 30
a view of the arrangement according to Fig. 28 along a in Fig. 28 with XXX - XXX designated cutting line;
FIG. 31
a side view of another embodiment of an arrangement with a bearing element and a pressure belt;
FIG. 32
a front view of the arrangement according to Fig. 31 ;
FIG. 33
a view of the arrangement according to Fig. 31 along a in Fig. 31 section line marked XXXIII - XXXIII;
FIG. 34
a schematic view of an example of a desired contour of a workpiece surface;
FIG. 35
a front view of an embodiment of a Andrückbands for producing a desired contour according to Fig. 34 ;
FIG. 36
a schematic view of another example of a desired contour of a workpiece surface; and
FIG. 37
a front view of an embodiment of a Andrückbands for producing a desired contour according to Fig. 36 ,

Eine Ausführungsform einer Bandfinishvorrichtung ist in Figur 1 insgesamt mit dem Bezugszeichen 10 bezeichnet. Diese dient zur finishenden Bearbeitung einer insbesondere rotationssymmetrischen Werkstückoberfläche 12 eines Werkstücks 14. Die finishende Bearbeitung der Werkstückoberfläche 12 erfolgt mittels eines Finishbands 16.One embodiment of a belt finishing device is shown in FIG FIG. 1 generally designated by the reference numeral 10. This is used for finishing machining of a particular rotationally symmetrical workpiece surface 12 of a workpiece 14. The finishing machining of the workpiece surface 12 is effected by means of a finishing tape 16.

Für das Finishband 16 ist beispielsweise ein Vorrat 17 vorgesehen. Ausgehend von dem Vorrat 17 ist das Finishband an einer Führungs-/Umlenkeinrichtung 18 geführt und umgelenkt und liegt in einem Wirkbereich 20 innerhalb eines Umschlingungswinkels (welcher beispielsweise mindestens ungefähr 10° beträgt) an der Werkstückoberfläche 12 an.For example, a supply 17 is provided for the finishing belt 16. Starting from the supply 17, the finishing belt is guided and deflected on a guiding / deflecting device 18 and lies in an operative region 20 within a Wrap angle (which is, for example, at least about 10 °) at the workpiece surface 12 at.

An den Wirkbereich 20 schließt sich ein Bereich 22 an, in welchem verbrauchtes Finishband 16 gesammelt wird. Alternativ hierzu wird das Finishband 16 in dem Bereich 22 umgelenkt und einem dem ersten Wirkbereich 20 gegenüberliegenden zweiten Wirkbereich 24 zugeführt. Auch in dem zweiten Wirkbereich 24 liegt das Finishband innerhalb eines Umschlingungswinkels (welcher beispielsweise mindestens ungefähr 10° beträgt) an der Werkstückoberfläche 12 an.The area of action 20 is adjoined by an area 22 in which used finishing belt 16 is collected. Alternatively, the finishing belt 16 is deflected in the region 22 and fed to a first active region 20 opposite the second effective region 24. Also in the second active region 24, the finishing tape lies against the workpiece surface 12 within a wrapping angle (which, for example, is at least approximately 10 °).

An den Wirkbereich 24 schließt sich eine Führungs-/Umlenkeinrichtung 26 an, von welchem aus das Finishband 16 einem Sammelbereich 28 zugeführt wird.A guiding / deflecting device 26 adjoins the active region 24, from which the finishing belt 16 is fed to a collecting region 28.

Zum Andrücken des Finishbands 16 in den Wirkbereichen 20 und/oder 24 sind jeweils einem Wirkbereich 20, 24 zugeordnete Andrückeinrichtungen 30 vorgesehen. Die Andrückeinrichtungen 30 sind jeweils an Haltern 32 gehalten, welche vorzugsweise um jeweils zugeordnete Schwenkachsen 34 verschwenkbar sind.For pressing the finishing strip 16 in the effective regions 20 and / or 24, in each case an effective region 20, 24 associated pressing devices 30 are provided. The pressure devices 30 are respectively held on holders 32, which are preferably pivotable about respectively associated pivot axes 34.

Während der finishenden Bearbeitung des Werkstücks 14 wird dieses um eine Werkstückachse 36 rotierend angetrieben (vergleiche Fig. 2). Dieser Rotationsbewegung wird eine parallel zu der Rotationsachse 36 verlaufende, oszillierende Relativbewegung zwischen dem Finishband 16 und dem Werkstück 14 überlagert.During finishing machining of the workpiece 14, it is driven in rotation about a workpiece axis 36 (see FIG Fig. 2 ). This rotational movement is superimposed on a parallel to the axis of rotation 36, oscillating relative movement between the finishing belt 16 and the workpiece 14.

Figur 2 zeigt eine vergrößerte Darstellung einer Andrückeinrichtung 30. Diese umfasst zwei zueinander beabstandete Lagerrollen 38, deren nach radial außen weisende Oberflächen Lagerflächen 40 zur Lagerung eines Andrückbands 42 aufweisen. FIG. 2 shows an enlarged view of a pressing device 30. This includes two spaced bearing rollers 38, the radially outward facing surfaces bearing surfaces 40 for storing a Andrückbands 42 have.

Das Andrückband 42 ist in Form eines Endlosbands ausgebildet. Mit einem vorderen Abschnitt 44 wirkt das Andrückband 42 mit dem Finishband 16 zusammen. An den vorderen Abschnitt 44 schließen sich mit den Lagerflächen 40 zusammenwirkende Umlenkabschnitte 46 an, welche in einen rückwärtigen Abschnitt 48 des Andrückbands 42 übergehen. Der rückwärtige Abschnitt 48 ist zu dem vorderen Abschnitt 42 beabstandet. Der rückwärtige Abschnitt 48 ist mittels einer Andrückband-Abstützeinrichtung 50 im Bereich einer Abstützfläche 52 abgestützt. Die Abstützfläche 52 beaufschlagt den rückwärtigen Abschnitt 48 des Andrückbands 42 mit einer in Richtung auf das Werkstück 14 wirkenden Abstützkraft.The pressure belt 42 is formed in the form of an endless belt. With a front portion 44, the pressure belt 42 cooperates with the finishing belt 16. At the front portion 44 close to the bearing surfaces 40 cooperating deflection sections 46, which merge into a rear portion 48 of the Andrückbands 42. The rear portion 48 is spaced from the front portion 42. The rear portion 48 is supported by a Andrückband-supporting device 50 in the region of a support surface 52. The support surface 52 acts on the rear portion 48 of the Andrückbands 42 with a force acting in the direction of the workpiece 14 supporting force.

Die Lagerrollen 38 weisen zueinander parallele Lagerachsen 54 auf. Die Lagerachsen 54 sind schwimmend gelagert, beispielsweise mittels Lagerelementen 58 in Form von Kulissen. Die Form und Anordnung der Lagerelemente 58 (beispielsweise die Erstreckungsrichtung der Kulissen) ist derart, dass die Lagerachsen 54 in zu der Werkstückachse 36 radialer Richtung bewegbar sind.The bearing rollers 38 have mutually parallel bearing axes 54. The bearing axes 54 are floating, for example by means of bearing elements 58 in the form of scenes. The shape and arrangement of the bearing elements 58 (for example, the extension direction of the scenes) is such that the bearing axes 54 are movable in the radial direction to the workpiece axis 36.

Vorzugsweise sind die Lagerrollen 38 mittels einer stationären Lagerrollen-Abstützeinrichtung 60 abgestützt. Die Einrichtung 60 umfasst beispielsweise eine Abstützfläche 62, mittels welcher die Lagerrollen 38 unter Zwischenschaltung des Andrückbands 42 abgestützt sind. Die Einrichtungen 50 und 60 können miteinander einstückig ausgebildet sein. Die Abstützflächen 52 und 62 gehen vorzugsweise kontinuierlich (knickfrei) ineinander über.Preferably, the bearing rollers 38 are supported by a stationary bearing roller support 60. The device 60 includes, for example, a support surface 62, by means of which the bearing rollers 38 are supported with the interposition of the Andrückbands 42. The devices 50 and 60 may be formed integrally with each other. The support surfaces 52 and 62 preferably merge continuously (kink-free) into each other.

Die Andrückeinrichtung 30 ist für Werkstücke 14 mit unterschiedlichen Durchmessern geeignet. Wenn beispielsweise anstelle des Werkstücks 14 (vergleiche Figur 2) ein Werkstück 14' mit kleinerem Durchmesser (vergleiche Figur 3) finishend bearbeitet wird, verlagert sich dessen Werkstückachse 36' in Richtung auf das Finishband 16. Gleichzeitig erhöht sich der Umschlingungswinkel des Wirkbereichs 24. Darüber hinaus verlagern sich die Lagerachsen 54 der Lagerrollen 38 weiter in Richtung auf das Werkstück 14'.The pressing device 30 is suitable for workpieces 14 with different diameters. For example, if instead of the workpiece 14 (see FIG. 2 ) a workpiece 14 'of smaller diameter (see FIG. 3 At the same time, the wrap angle of the active region 24 increases. Moreover, the bearing shafts 54 of the bearing rollers 38 continue to shift in the direction of the workpiece 14 '.

Die Lagerrollen 38 sind bezogen auf die Lagerachsen 54 rotationssymmetrisch und weisen im Profil konvex gekrümmte Lagerflächen 40 auf (vergleiche Figur 4). Die Lagerfläche 40 dient zur Lagerung einer Rückseite 64 (vergleiche Figur 6) des Andrückbands 42.The bearing rollers 38 are based on the bearing axes 54 rotationally symmetrical and have in profile convex curved bearing surfaces 40 (see FIG. 4 ). The bearing surface 40 serves to support a rear side 64 (cf. FIG. 6 ) of the Andrückbands 42.

Das Andrückband 42 weist eine der Rückseite 64 abgewandte Andrückfläche 66 auf, welche eine Rückseite 68 des Finishbands 16 mit Andrückkräften beaufschlagt, sodass eine mit Finishmaterial versehene Wirkfläche 70 des Finishbands 16 gegen die finishend zu bearbeitende Werkstückoberfläche 12 des Werkstücks 14 gedrückt wird.The pressure belt 42 has a pressing surface 66 facing away from the rear side 64, which acts on a rear side 68 of the finishing belt 16 with pressing forces, so that an active surface 70 of the finishing belt 16 provided with finish material is pressed against the workpiece surface 12 of the workpiece 14 to be finish-machined.

Das Andrückband 42 ist in einem unverformten Ausgangszustand im Querschnitt rechteckförmig. Somit weist die Andrückfläche 66 in dem unverformten Ausgangszustand des Andrückbands 42 einen geradlinigen Verlauf auf. Das Andrückband 42 ist elastisch verformbar und liegt in den Umlenkabschnitten 46 (vergleiche Figur 2) mit seiner Rückseite 64 flächig an der Lagerfläche 40 an. Hierdurch verformt sich das Andrückband 42, sodass die Andrückfläche 66 ein der Krümmung der Lagerfläche 40 entsprechendes gekrümmtes Profil aufweist. Der Krümmung der Andrückfläche 66 des Andrückbands 42 entsprechend verformt sich auch das an dem Andrückband 42 anliegende Finishband 16, sodass die Wirkfläche 70 des Finishbands 16 konvex gekrümmt und eine konkav gekrümmte Werkstückoberfläche 12 herstellbar ist. Die Lagerflächen 40 und die Andrückfläche 66 des Andrückbands 42 weisen also ein gekrümmtes Profil auf, das in Breitenrichtung 72 des Finishbands 16 von einem geradlinigen Verlauf abweicht.The pressing belt 42 is rectangular in cross-section in an undeformed initial state. Thus, the pressing surface 66 in the undeformed initial state of Andrückbands 42 on a straight line. The pressure belt 42 is elastically deformable and lies in the deflection sections 46 (see FIG FIG. 2 ) with its back 64 flat on the bearing surface 40 at. As a result, the pressing belt 42 deforms, so that the pressing surface 66 has a curved profile corresponding to the curvature of the bearing surface 40. The curvature of the pressing surface 66 of the Andrückbands 42 accordingly deforms the on the pressure belt 42 fitting finishing belt 16 so that the active surface 70 of the finishing belt 16 convexly curved and a concave workpiece surface 12 can be produced. The bearing surfaces 40 and the pressure surface 66 of the Andrückbands 42 thus have a curved profile which deviates in the width direction 72 of the finishing belt 16 from a straight-line course.

Die vorstehende Beschreibung gilt entsprechend für eine in den Figuren 7 bis 9 dargestellte Ausführungsform. Bei dieser Ausführungsform jedoch sind die Lagerflächen 40 der Lagerrollen 38 konkav gekrümmt. Unter Zwischenschaltung des Andrückbands 42 entsteht eine konkav gekrümmte Wirkfläche 70 des Finishbands 16, wodurch eine konvex gekrümmte Werkstückoberfläche 12 des Werkstücks 14 herstellbar ist.The above description applies accordingly to one in the FIGS. 7 to 9 illustrated embodiment. In this embodiment, however, the bearing surfaces 40 of the bearing rollers 38 are concavely curved. With the interposition of Andrückbands 42 creates a concave curved active surface 70 of the finishing belt 16, whereby a convexly curved workpiece surface 12 of the workpiece 14 can be produced.

Vorzugsweise beträgt ein Krümmungsradius einer konvex gekrümmten Lagerfläche 40 (vergleiche Fig. 4) zwischen ungefähr 1000 mm und ungefähr 6000 mm. Bei einer Lagerbreite von ca. 20 bis 25 mm ist eine Sehnenhöhe (also eine maximale, auf eine Kreiszylinderform bezogene Überhöhung) von ca. 0,02 bis 0,05 mm geeignet.Preferably, a radius of curvature of a convexly curved bearing surface 40 (cf. Fig. 4 ) between about 1000 mm and about 6000 mm. With a bearing width of about 20 to 25 mm, a chord height (ie a maximum, based on a circular cylinder shape overshoot) of about 0.02 to 0.05 mm is suitable.

Ein Krümmungsradius einer konkav gekrümmten Lagerfläche 40 (vergleiche Fig. 7) beträgt vorzugsweise zwischen ungefähr 1000 mm und ungefähr 6000 mm. Bei einer Lagerbreite von ca. 20 bis 25 mm ist eine Sehnenhöhe (also eine maximale, auf eine Kreiszylinderform bezogene Absenkung) von ca. 0,02 bis 0,05 mm geeignet.A radius of curvature of a concavely curved bearing surface 40 (cf. Fig. 7 ) is preferably between about 1000 mm and about 6000 mm. With a bearing width of approx. 20 to 25 mm, a chord height (ie a maximum reduction based on a circular cylinder shape) of approx. 0.02 to 0.05 mm is suitable.

Figur 10c zeigt eine der Figur 9 entsprechende Darstellung. Dem Zustand gemäß Figur 10c vorhergehende Werkstückbearbeitungsphasen sind in den Figuren 10a und 10b dargestellt. FIG. 10c shows one of the FIG. 9 corresponding representation. According to the state FIG. 10c Previous workpiece processing phases are in the Figures 10a and 10b shown.

In dem in Figur 10a dargestellten Zustand ist die Werkstückoberfläche 12 des Werkstücks 14 zylindrisch. Durch die Krümmung der Wirkfläche 70 des Finishbands 16 bedingt liegt dieses zunächst nur mit Randbereichen 74 an hierzu korrespondierenden Randbereichen 76 des Werkstücks 14 an. Diese Bereiche üben entsprechend hohe Gegenkräfte 78 (vergleiche Figur 11a) auf das Finishband 16 aus. Mit fortschreitender Bearbeitung der Werkstückoberfläche 12 verteilen sich die Gegenkräfte 78 weiter in Richtung auf einen zentralen Bereich 80 (vergleiche Figur 11b) des Werkstücks 14.In the in FIG. 10a As shown, the workpiece surface 12 of the workpiece 14 is cylindrical. As a result of the curvature of the active surface 70 of the finishing strip 16, this is initially present only with edge regions 74 at corresponding edge regions 76 of the workpiece 14. These areas exert correspondingly high opposing forces 78 (cf. FIG. 11a ) on the finishing belt 16. As the workpiece surface 12 progresses, the counterforces 78 continue to distribute toward a central region 80 (see FIG FIG. 11b ) of the workpiece 14.

In Figur 11c ist ein Zustand dargestellt, bei welcher die Werkstückoberfläche 12 eine gekrümmte Soll-Kontur annimmt. In diesem Zustand korrespondiert der konkave Krümmungsradius der Wirkfläche 70 des Finishbands 16 mit dem konvexen Krümmungsradius der Werkstückoberfläche 12 des Werkstücks 14 und die Wirkfläche 70 liegt in Breitenrichtung 72 gesehen vollflächig an der Werkstückoberfläche 12 des Werkstücks 14 an.In FIG. 11c a state is shown in which the workpiece surface 12 assumes a curved target contour. In this state, the concave radius of curvature of the active surface 70 of the finishing tape 16 corresponds to the convex radius of curvature of the workpiece surface 12 of the workpiece 14 and the active surface 70 is located in the width direction 72 on the entire surface of the workpiece surface 12 of the workpiece 14.

Für die nachfolgend unter Bezugnahme auf die Figuren 12 bis 27 beschriebenen Andrückeinrichtungen 30 wird auf die vorstehende Beschreibung der Andrückeinrichtungen 30 gemäß Figuren 1 bis 11c Bezug genommen. Nachfolgend werden insbesondere die Unterschiede zu den vorstehend beschriebenen Andrückeinrichtungen 30 erörtert.For the following with reference to the FIGS. 12 to 27 described pressing means 30 is made to the above description of the pressing means 30 according to FIGS. 1 to 11c Referenced. In particular, the differences to the above-described pressing devices 30 will be discussed below.

Bei der Andrückeinrichtung 30 gemäß Figuren 12 und 13 ist anstelle der Lagerrollen 38 ein stationäres Lagerelement 82 mit unbewegbaren Lagerflächen 40 vorgesehen.In the pressing device 30 according to Figures 12 and 13 instead of the bearing rollers 38, a stationary bearing element 82 with immovable bearing surfaces 40 is provided.

Solche Lagerelemente 82 sind beispielsweise in Figuren 16 und 22 perspektivisch dargestellt. Die Lagerelemente 82 weisen im Bereich zwischen zwei zueinander beabstandeten Lagerflächen 40 eine dem Wirkbereich 20 des Finishbands 16 zugeordnete Einschnürung 84 auf. Die Einschnürung 84 ist so groß, dass ein auf Höhe des Wirkabschnitts 20 des Finishbands 16 angeordneter vorderer Abschnitt 44 des Andrückbands 42 mit seiner Rückseite 64 von dem Lagerelement 82 beabstandet ist und ein Freiraum 86 entsteht (vergleiche Figuren 12 und 13). Der Freiraum 86 bildet einen Ausweichraum für den vorderen Abschnitt 44 des Andrückbands 42 bei Anlage eines Teilumfangs einer zu finishenden Werkstückoberfläche 12 eines Werkstücks 14. In Abhängigkeit der Größe des Werkstücks 14 beziehungsweise des Durchmessers der zur bearbeitenden Werkstückoberfläche 12 passt sich der Verlauf des Andrückbands 42 dem Verlauf der zu bearbeitenden Werkstückoberfläche 12 an (beispielsweise an größere Werkstücke 14, vergleiche Figur 12 und an kleinere Werkstücke 14', vergleiche Figur 13).Such bearing elements 82 are for example in Figures 16 and 22 shown in perspective. The bearing elements 82 have in the area between two spaced apart Bearing surfaces 40 a the effective range 20 of the finishing belt 16 associated constriction 84. The constriction 84 is so large that a front portion 44 of the pressure belt 42 arranged at the level of the effective portion 20 of the finishing belt 16 is spaced apart from the bearing element 82 by its rear side 64 and a free space 86 is created (see FIG Figures 12 and 13 ). The clearance 86 forms an escape space for the front portion 44 of the Andrückbands 42 upon application of a partial circumference of a workpiece surface to be finished 12 of a workpiece 14. Depending on the size of the workpiece 14 and the diameter of the machined workpiece surface 12, the course of the Andrückbands 42 fits Course of the workpiece surface to be machined 12 (for example, to larger workpieces 14, see FIG. 12 and to smaller workpieces 14 ', cf. FIG. 13 ).

Die Lagerelemente 82 weisen auf ihrer der Einschnürung 84 abgewandten Seite eine Abstützfläche 52 auf.The bearing elements 82 have on their side facing away from the constriction 84 a support surface 52.

Die Andrückeinrichtung 30 gemäß Figuren 12 und 13 umfasst ferner eine insgesamt mit dem Bezugszeichen 87 bezeichnete Fixiereinrichtung zur Fixierung des Andrückbands 42 relativ zu den Lagerflächen 40. Die Fixiereinrichtung 87 umfasst beispielsweise ein Betätigungselement 88 in Form einer Schraube, welches ein Fixierelement 90 gegen das Andrückband 42 und dieses gegen die Abstützfläche 52 drückt (vergleiche Figuren 14 und 15).The pressing device 30 according to Figures 12 and 13 The fixing device 87 comprises, for example, an actuating element 88 in the form of a screw which presses a fixing element 90 against the pressing belt 42 and this against the supporting surface 52 (FIG. compare FIGS. 14 and 15 ).

Das Lagerelement 82 weist beispielsweise einen einstückigen Lagerkörper 92 auf, der sich in Breitenrichtung 72 des Finishbands 16 (vergleiche Figur 15) zwischen einander gegenüberliegenden Seitenflächen 94 und 96 erstreckt (vergleiche Figur 18).The bearing element 82 has, for example, a one-piece bearing body 92 which extends in the width direction 72 of the finishing strip 16 (cf. FIG. 15 ) extends between opposed side surfaces 94 and 96 (see FIG FIG. 18 ).

Der Lagerkörper 92 kann beispielsweise mittels Schrauben 98 mit Halteteilen 100 verbunden sein (vergleiche Figuren 15 und 12), welche zur Befestigung des Lagerelements 82 an den Haltern 32 dient (vergleiche Figur 1). Die Halteteile 100 können auch mit einem Rahmen 102 (vergleiche Figuren 12 und 13) verbunden sein, welcher seinerseits mit einem Halter 32 verbunden ist.The bearing body 92 may be connected, for example by means of screws 98 with holding parts 100 (see FIGS. 15 and 12 ), which serves to attach the bearing member 82 to the holders 32 (see FIG. 1 ). The holding parts 100 can also be connected to a frame 102 (cf. Figures 12 and 13 ), which in turn is connected to a holder 32.

Bei der in den Figuren 12 bis 21 dargestellten Ausführungsform einer Andrückeinrichtung 30 weisen die Lagerflächen 40 des Lagerelements 82 einen geradlinigen Verlauf auf. Diese Lagerflächen 40 entsprechen zwischen ihrem Übergang zu der Einschnürung 84 und zu der Abstützfläche 52 Flächenabschnitten eines Zylindermantels. Diese Lagerflächen 40 dienen zur Lagerung eines Andrückbands 42, dessen Andrückfläche 66 im Profil gekrümmt, insbesondere konkav gekrümmt ist (vergleiche Figur 15).In the in the FIGS. 12 to 21 illustrated embodiment of a pressing device 30, the bearing surfaces 40 of the bearing element 82 a straight-line course. These bearing surfaces 40 correspond between their transition to the constriction 84 and to the support surface 52 surface portions of a cylinder jacket. These bearing surfaces 40 are used for mounting a Andrückbands 42, the pressing surface 66 is curved in profile, in particular concavely curved (see FIG. 15 ).

Die Abstützfläche 52 des Lagerelements 82 gemäß Figuren 16 bis 21 erstreckt sich vorzugsweise in einer geraden Ebene.The support surface 52 of the bearing element 82 according to FIGS. 16 to 21 preferably extends in a straight plane.

Bei der in den Figuren 22 bis 27 dargestellten Ausführungsform eines Lagerelements 82 und eines Andrückbands 42 zur Verwendung bei einer Andrückeinrichtung 30 gemäß Figuren 12 bis 15 weisen die Lagerflächen 40 ein gekrümmtes Profil, insbesondere ein konkav gekrümmtes Profil, auf. Solche Lagerelemente 82 können insbesondere, wie in Figuren 25 bis 27 dargestellt, gemeinsam mit einem Andrückband 42 verwendet werden, welches in einem unverformten Ausgangszustand einen rechteckförmigen Querschnitt mit einer geradlinig profilierten Andrückfläche 66 aufweist, verwendet werden. Bei Verwendung eines solchen Andrückbands 42 überträgt sich die Form der Krümmung der Lagerfläche 40 auf die Andrückfläche 66 und auf das Finishband 16 und auf die zu bearbeitende Werkstückoberfläche 12.In the in the FIGS. 22 to 27 illustrated embodiment of a bearing member 82 and a Andrückbands 42 for use in a pressing device 30 according to FIGS. 12 to 15 the bearing surfaces 40 a curved profile, in particular a concave curved profile, on. Such bearing elements 82 may in particular, as in FIGS. 25 to 27 represented, together with a Andrückband 42 are used, which has a rectangular cross section with a straight-profiled Andrückfläche 66 in an undeformed initial state, are used. When using such Andrückbands 42, the shape of the curvature of the bearing surface 40 transmits to the pressing surface 66 and on the Finishing belt 16 and on the workpiece surface to be machined 12th

Es ist aber auch möglich, das Lagerelement 82 gemäß Figuren 22 bis 24 gemeinsam mit einem Andrückband 42 zu verwenden, welches eine im Profil gekrümmte Andrückfläche 66 aufweist (ein solches Andrückband 42 ist beispielsweise in Figur 21 dargestellt).But it is also possible, the bearing element 82 according to FIGS. 22 to 24 to use together with a Andrückband 42, which has a curved in profile pressure surface 66 (such a pressure belt 42 is, for example, in FIG. 21 shown).

Für die nachfolgend unter Bezugnahme auf die Figuren 28 bis 33 beschriebenen Ausführungsformen wird auf die vorstehende Beschreibung Bezug genommen. Die Andrückbänder 42 gemäß Figuren 28 bis 33 weisen im Unterschied zu den vorstehend beschriebenen Andrückbändern 42 Durchbrechungen 104 auf, welche insbesondere auf Höhe der Einschnürung 84 und somit auf Höhe des Wirkbereichs 20 des Finishbands 16 angeordnet sind. Es ist möglich, dass lediglich eine Durchbrechung 104 (vergleiche Figur 29) vorgesehen ist. Es ist auch möglich, dass mehrere Durchbrechungen 104 vorgesehen sind (vergleiche Figur 32).For the following with reference to the FIGS. 28 to 33 described embodiments, reference is made to the above description. The Andrückbänder 42 according to FIGS. 28 to 33 have in contrast to the above-described Andrückbändern 42 openings 104, which are arranged in particular at the level of the constriction 84 and thus at the height of the effective region 20 of the finishing belt 16. It is possible that only one aperture 104 (cf. FIG. 29 ) is provided. It is also possible that a plurality of apertures 104 are provided (see FIG. 32 ).

Die Durchbrechungen 104 weisen eine Erstreckung in Breitenrichtung 72 des Finishbands 16 auf und eine Erstreckung in Laufrichtung 106 des Finishbands 16 auf.The apertures 104 have an extension in the width direction 72 of the finishing tape 16 and an extension in the running direction 106 of the finishing tape 16.

Für den Fall, dass lediglich eine Durchbrechung 104 vorgesehen ist, kann diese vorzugsweise im Wesentlichen elliptisch oder rautenförmig ausgebildet sein.In the event that only one opening 104 is provided, this may preferably be formed substantially elliptical or diamond-shaped.

Figur 34 zeigt eine vergrößert dargestellte Soll-Kontur 108 eines Werkstücks 14, welche über die Breitenrichtung 72 des Finishbands 16 aufgetragen ist. Die Soll-Kontur 108 weicht von einer Kreiszylinderform 110 ab, und zwar um voneinander abweichende Werkstück-Materialabträge 112. Die größten Werkstück-Materialabträge 112 ergeben sich für außenliegende Soll-Konturabschnitte A, kleinere Werkstück-Materialabträge für die Soll-Konturabschnitte B, wiederum kleinere Werkstück-Materialabträge für die Soll-Konturabschnitte C und keinen oder nur einen geringfügigen Materialabtrag für einen Soll-Konturabschnitt D. FIG. 34 shows an enlarged illustrated target contour 108 of a workpiece 14, which is applied across the width direction 72 of the finishing belt 16. The desired contour 108 deviates from a circular cylindrical shape 110, namely by divergent workpiece material removal 112. The largest workpiece material removal 112 results for outer setpoint contour sections A, smaller workpiece material removal for the desired contour sections B, in turn smaller workpiece material removal for the desired contour sections C and no or only a slight material removal for a desired contour section D.

Zur Dimensionierung einer in Figur 35 dargestellten Unterbrechung 104 wird ein Andrückband 42 bereitgestellt, welches in Breitenrichtung 72 des Finishbands 16 gesehen aufeinander folgende Bandabschnitte (ABCDCBA) aufweist. Hierbei wird einem Bandabschnitt D, welcher mit einem Soll-Konturabschnitt D der Soll-Kontur 108 des Werkstücks 14 korrespondiert, mit einer Unterbrechung 104' versehen, die in Laufrichtung 106 des Finishbands 16 länger ist als Unterbrechungen 104", welche Bandabschnitten C zugeordnet sind, die mit entsprechenden Soll-Konturabschnitten mit größeren Materialabtragsraten 112 korrespondieren. Insgesamt ergibt sich beispielsweise eine Anordnung gemäß Figur 35, wobei zueinander benachbarte Unterbrechungen 104, 104', 104 ", 104"' gemeinsam eine durchgängige Unterbrechung 104 bilden. Alternativ hierzu können die Unterbrechungen 104, 104', 104", 104"' aber auch voneinander getrennt vorgesehen sein.For sizing an in FIG. 35 illustrated interruption 104, a pressing belt 42 is provided, which seen in the width direction 72 of the finishing belt 16 has successive band sections (ABCDCBA). In this case, a band section D, which corresponds to a desired contour section D of the target contour 108 of the workpiece 14, is provided with an interruption 104 ', which is longer in the direction 106 of the finishing strip 16 than interruptions 104 ", which band sections C are assigned. which correspond with corresponding desired contour sections with larger material removal rates 112. Overall, for example, an arrangement according to FIG FIG. 35 , wherein mutually adjacent interruptions 104, 104 ', 104 ", 104"' together form a continuous interruption 104. Alternatively, the interruptions 104, 104 ', 104 ", 104"' but also be provided separately.

Bei einer weiteren Verfeinerung der Dimensionierung einer Unterbrechung 104 kann die Soll-Kontur 108 eines Werkstücks 14 auch in Form einer insbesondere kontinuierlichen und knickfreien Funktion beschrieben werden, wie in Figur 36 durch ein Koordinatensystem angedeutet. Beispielsweise handelt es sich bei einer solchen Funktion um eine Kreisfunktion oder um einen Logarithmus. In Abhängigkeit der Funktion kann dann der Verlauf 114 einer Durchbrechung 104 ermittelt werden (vergleiche Figur 37).In a further refinement of the dimensioning of an interruption 104, the desired contour 108 of a workpiece 14 can also be described in the form of a particularly continuous and kink-free function, as in FIG FIG. 36 indicated by a coordinate system. For example, such a function is a circular function or a logarithm. Depending on the function, the course 114 of an opening 104 can then be determined (cf. FIG. 37 ).

Mit den beispielsweise in Figuren 35 und 37 dargestellten Unterbrechungen 104 wird erreicht, dass in Breitenrichtung 72 des Finishbands 16 gesehen unterschiedliche Materialabtragsraten 112 realisierbar sind. Da das Andrückband 42 in einem zentralen Abschnitt D in Laufrichtung 106 eine längere Unterbrechung aufweist, wird das Finishband 16 in diesem Bereich mit einer niedrigeren Spannung an das Werkstück 12 gedrückt, sodass dort ein kleinerer Materialabtrag stattfindet. Hingegen sind die Durchbrechungen in seitlichen Bandabschnitten (beispielsweise in Bandabschnitten B) in Laufrichtung 106 des Finishbandes 16 gesehen kürzer, sodass in diesen Bandabschnitten das Andrückband 42 mit größerer Kraft gegen das Finishband 16 gedrückt wird und in diesen Bereichen ein höherer Materialabtrag stattfindet.With the example in Figures 35 and 37 illustrated interruptions 104 is achieved that seen in the width direction 72 of the finishing belt 16 different material removal rates 112 can be realized. Since the pressing belt 42 has a longer interruption in a central portion D in the running direction 106, the finishing belt 16 is pressed in this area with a lower voltage to the workpiece 12, so that there takes place a smaller material removal. On the other hand, the perforations in lateral strip sections (for example in strip sections B) are shorter in the running direction 106 of the finishing strip 16, so that in these strip sections the pressing strip 42 is pressed with greater force against the finishing strip 16 and a higher material removal takes place in these areas.

Claims (15)

  1. Belt finishing device (10) comprising a pressing device (30) for pressing a finishing belt (16) against a workpiece surface (12), wherein the pressing device (30) comprises a pressure belt (42) which is supported on two spaced-apart bearing surfaces (40) as viewed in the running direction (106) of the finishing belt, (16), characterized in that at least one of the bearing surfaces (40) and/or the pressure belt (42) has a profile that deviates in the width direction (72) of the finishing belt (16) from a straight course.
  2. Belt finishing device (10) according to claim 1, characterized in that the profile is curved.
  3. Belt finishing device (10) according to one of the preceding claims, characterized in that the at least one bearing surface (40) and/or the pressure belt (42) has at least one discontinuity (104).
  4. Belt finishing device (10) according to claim 3, characterized in that the discontinuity (104) is in the form of a pocket-shaped recess and/or in the form of an opening.
  5. Belt finishing device (10) according to one of the preceding claims, characterized in that at least one of the bearing surfaces (40) is formed by a bearing roller (38).
  6. Belt finishing device (10) according to claim 5, characterized in that the bearing roller (38) is floatingly supported.
  7. Belt finishing device (10) according to claim 5 or 6, characterized in that the bearing roller (38) can be supported on a stationary bearing roller support device (60).
  8. Belt finishing device (10) according to one of the preceding claims, characterized in that at least one of the bearing surfaces (40) is formed by a stationary bearing element (82).
  9. Belt finishing device (10) according to one of the preceding claims, characterized in that a fixing device (87) for fixing the pressure belt (42) relative to the bearing surfaces (40) is provided.
  10. Belt finishing device (10) according to one of the preceding claims, characterized in that the profile is provided on a pressing surface (66) of pressure belt (42) facing the finishing belt (16).
  11. Belt finishing device (10) according to one of the preceding claims, characterized in that the pressure belt (42) is in the form of an endless belt.
  12. Belt finishing device (10) according to claim 11, characterized in that a pressure belt support device (50) is provided, with which a rearward section (48) of the pressure belt (42), which is spaced from the finishing belt (16) and which extends between the bearing surfaces (40) arranged with a mutual spacing, is or can be supported.
  13. Belt finishing system, comprising a belt finishing device (10) according to one of the preceding claims and a workpiece (14) having a workpiece (12) surface to be finish-processed, characterized in that at least one of the bearing surfaces (40) and/or the pressure belt (42) comprises at least an discontinuity (104), that the workpiece surface (12) is interrupted in the region of a bore, and that the position of the discontinuity (104) in the width direction (72) of the finishing belt (16) is matched to the position of the bore.
  14. Method for producing a belt finishing device (10) according to one of the preceding claims, characterized in that the nominal contour (108) of a finish-machined workpiece surface (12) is determined, and that additionally at least one of the following measures is performed:
    - at least one of the bearing surfaces (40) or a pressing surface (66) of the pressure belt (42) facing the finishing belt (16) is provided with a profile that is identical to the nominal contour (108) or has a more pronounced contour;
    - at least one of the bearing surfaces (40) and a pressing surface (66) of the pressure belt (42) facing the finishing belt (16) is each provided with a partial profile, wherein a superposition of the two partial profiles is identical to the nominal contour (108) or has a more pronounced contour;
    - nominal contour sections are defined and removal of material (112) from the workpiece deviating from a circular cylindrical shape is determined for each of the nominal contour sections; at least one of the bearing surfaces (40) and/or the pressure belt (42) is provided with at least one discontinuity (104), wherein the discontinuity (104) is associated with a nominal contour section having lesser material removal (112) from the workpiece than the material removal (112) from an adjacent nominal contour section;
    - nominal contour sections are defined, and for each of the nominal contour sections deviating from a circular cylindrical shape (110) material removal (112) from the workpiece is determined; at least one of the bearing surfaces (40) and/or the pressure belt (42) is provided with discontinuities (104', 104"), which are each associated with a corresponding nominal contour section, wherein the discontinuities (104', 104") have different lengths as measured in the running direction (106) of the finishing belt (16), and discontinuities (104") having shorter lengths are associated with nominal contour sections having greater material removal rates (112) and discontinuities (104') having greater lengths are associated with nominal contour sections having lower material removal rates (112).
  15. Method according to claim 14, characterized in that the profile and/or superposition of the two partial profiles is more pronounced than the nominal contour, and that the profile and/or the superposition of the two partial profiles delimits a segment of a circle, as viewed across an effective width of the finishing belt (16), with the segment height being greater by a factor from 1.5 to 25, preferably from 3 to 15, especially from 5 to 10, than a segment height of a segment of a circle that is delimited by the nominal contour (108), as viewed across the effective width of the finishing belt (16).
EP12186775.8A 2012-10-01 2012-10-01 Belt finishing device, belt finishing system and method for producing a belt finishing device Active EP2712702B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP12186775.8A EP2712702B1 (en) 2012-10-01 2012-10-01 Belt finishing device, belt finishing system and method for producing a belt finishing device
KR1020130114608A KR101571212B1 (en) 2012-10-01 2013-09-26 Band-finishing apparatus, band-finishing system and method for manufacturing band-finishing apparatus
US14/039,832 US9221146B2 (en) 2012-10-01 2013-09-27 Belt finishing device, belt finishing system and method for producing a belt finishing device
BR102013025046-5A BR102013025046B1 (en) 2012-10-01 2013-09-27 TAPE FINISHING DEVICE, TAPE FINISHING SYSTEM AND PROCESS FOR TAPE FINISHING DEVICE PRODUCTION
CN201310456043.6A CN103707165B (en) 2012-10-01 2013-09-29 Belt finishing device, belt finishing system and method for producing a belt finishing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12186775.8A EP2712702B1 (en) 2012-10-01 2012-10-01 Belt finishing device, belt finishing system and method for producing a belt finishing device

Publications (2)

Publication Number Publication Date
EP2712702A1 EP2712702A1 (en) 2014-04-02
EP2712702B1 true EP2712702B1 (en) 2014-12-03

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EP12186775.8A Active EP2712702B1 (en) 2012-10-01 2012-10-01 Belt finishing device, belt finishing system and method for producing a belt finishing device

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US (1) US9221146B2 (en)
EP (1) EP2712702B1 (en)
KR (1) KR101571212B1 (en)
CN (1) CN103707165B (en)
BR (1) BR102013025046B1 (en)

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KR20140043282A (en) 2014-04-09
US9221146B2 (en) 2015-12-29
BR102013025046B1 (en) 2021-12-21
CN103707165B (en) 2017-04-12
KR101571212B1 (en) 2015-11-23
CN103707165A (en) 2014-04-09
BR102013025046A2 (en) 2014-10-14
EP2712702A1 (en) 2014-04-02
US20140094099A1 (en) 2014-04-03

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