WO2012065949A1 - Procédé et dispositif de finition de surfaces courbées de pièces au moyen d'une bande de finition - Google Patents

Procédé et dispositif de finition de surfaces courbées de pièces au moyen d'une bande de finition Download PDF

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Publication number
WO2012065949A1
WO2012065949A1 PCT/EP2011/070056 EP2011070056W WO2012065949A1 WO 2012065949 A1 WO2012065949 A1 WO 2012065949A1 EP 2011070056 W EP2011070056 W EP 2011070056W WO 2012065949 A1 WO2012065949 A1 WO 2012065949A1
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WO
WIPO (PCT)
Prior art keywords
tape
finishing
workpiece
belt
roll
Prior art date
Application number
PCT/EP2011/070056
Other languages
German (de)
English (en)
Inventor
Phillip Utsch
Original Assignee
Nagel Maschinen- Und Werkzeugfabrik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nagel Maschinen- Und Werkzeugfabrik Gmbh filed Critical Nagel Maschinen- Und Werkzeugfabrik Gmbh
Priority to CN2011800651971A priority Critical patent/CN103402703A/zh
Priority to HU1300374A priority patent/HU229618B1/hu
Publication of WO2012065949A1 publication Critical patent/WO2012065949A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/004—Machines or devices using grinding or polishing belts; Accessories therefor using abrasive rolled strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/02—Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces

Definitions

  • the invention relates to a method for finishing curved workpiece surfaces on workpieces according to the preamble of claim 1 and to a device for finishing curved workpiece surfaces on workpieces according to the preamble of claim 11. Furthermore, the invention relates to a finishing unit according to the preamble of claim 15.
  • Finishing which is also referred to as superfinishing, is a machining process with indefinite cutting edges.
  • workpieces such as crankshafts, camshafts, transmission shafts or other components for power and working machines can be edited to produce a desired surface fine structure.
  • a machining tool finishing stone or finishing tape set with granular cutting material is pressed against the peripheral surface to be machined.
  • the workpiece is rotated about its workpiece axis.
  • a relative movement between the workpiece and the machining tool resting against the peripheral surface is simultaneously generated parallel to the workpiece axis.
  • a so-called cross-cut pattern can be generated, whereby the machined workpiece surfaces, for example, as running surfaces for plain bearings or bearings or the like are particularly suitable.
  • the workpiece section to be machined may be, for example, a main bearing or a crank bearing of a crankshaft or a camshaft bearing. Even rotationally asymmetric workpiece surfaces, such as the outer surfaces of cams, can be machined by means of finishing. Finishing procedures without oscillating relative movement are also possible.
  • finishing is a thermally neutral processing method in which no soft skin interspersed with microcracks or surface tensions arises. Finishing is often used after a grinding process as the last machining process of a processing chain to remove the soft skin, to expose the original microstructure again, to increase the carrying portion of the roughened surface structure and to improve the component geometry.
  • bonded grain processing tools are used so that washing operations and facilities for the disposal of lapping slurry can be eliminated.
  • a finishing belt is used as a processing tool.
  • a finishing belt has a band-shaped flexible carrier in which cutting grains are applied on the front side facing the workpiece with the aid of a binder.
  • One class of tape finishing method involves the use of a finite (non-continuous) finishing tape, the tape ends of which are each secured to a tape roll.
  • the fresh, still unused finishing belt is held on a supply roll and guided by means of tape guide devices over the engagement area on the workpiece to a driven tape roll, which receives the used finishing tape.
  • the tape feed is over - Achieved a drive of this tape roll, which pulls the tape through the entrance area.
  • the reel with the fresh finishing belt acts as a band brake and maintains the belt tension.
  • the finishing belt rests during processing, so that the cutting speed is generated exclusively by the rotational movement of the workpiece and possibly also by the superimposed axial oscillating relative movement between the workpiece and finishing belt.
  • a used finishing belt section is replaced with a fresh finishing belt section by advancing the finishing belt by a predetermined belt advance distance in a processing break with unloaded finishing belt.
  • process variants with a slow tape feed during the machining operation in order to achieve that as uniform as possible engagement conditions prevail with each fresh cutting grain.
  • Devices and methods for carrying out these variants of strip finishing are disclosed, for example, in WO 2009/049868 A1 or DE 199 25 077 A1.
  • the workpiece is also rotated about its axis of rotation. Similar to a belt sander, a continuously driven, endless finishing belt is used which partially wraps around a workpiece surface (peripheral surface) of the workpiece to be machined during machining and rests flat against the workpiece in a region predetermined by the wrap angle. Examples of such methods are given in EP 1 514 640 B1 or EP 1 514 643 B1. This process is known in the art as "CAB process", where the abbreviation CAB stands for "Continuous Abrasive Belt”.
  • CAB process the abbreviation CAB stands for "Continuous Abrasive Belt”.
  • the finishing belt running over pulleys should be able to adapt flexibly to the geometry of the rotating workpiece and ensure high surface quality. As a rule, circumferential machining marks are generated.
  • a high belt advance speed can be achieved so that a reduced peripheral speed of the machined workpiece surface, which may be due to the workpiece geometry, can be compensated. At the same time can be achieved by the surface contact a high removal rate.
  • endless circumferential finishing tapes the conditions of engagement are not constant in principle, since the rotating finishing belt can wear out with increasing processing time and / or become clogged with abrasion. The varying engagement conditions can lead to a steadily increasing - - Reducing material removal and, depending on the pre-processing, possibly lead to a deterioration of the process result.
  • the invention has for its object to provide a method for finishing curved workpiece surfaces on workpieces, a suitable for performing the method finishing equipment and a Finishech thereby used, with which nen finishing machining in a variety of workpieces of different geometry with high productivity and simultaneously largely constant high processing quality is possible.
  • the invention provides a method with the features of claim 1 and a device with the features of claim 1 1 ready.
  • a finisher unit with the features of claim 15 is provided.
  • the tape feed of the finishing belt contributes significantly to the decisive for the chip removal cutting speed on the machined workpiece surface.
  • high removal rates are possible even if the workpiece, for example, can only be rotated relatively slowly due to its geometry and / or if only relatively low peripheral speeds can be realized even with relatively large workpiece speeds due to a relatively small diameter of a workpiece section to be machined.
  • the use of finite finishing tapes with large overall length can ensure that too - When finishing large workpiece series always finishing belt with relatively uniform Schneidfreudtechnik or uniform cutting behavior is available, so that a largely constant quality machining is possible.
  • a wear-related replacement of finishing tapes is therefore much less necessary than when using endless finishing tapes, which machine downtime can be reduced and the productivity of finish machining can be improved. Furthermore, a finishing tape can be used in two opposite directions for material removal. As a result, wear-related quality losses can be reduced.
  • the finishing belt is moved during the processing of a single workpiece surface at least once in the direction of the first roll of tape and after a reversal of the direction of movement in the direction of the second roll of tape.
  • the finite finishing tape is thus used here once or several times in opposite directions for the removal of material when machining a single workpiece surface.
  • the tape consumption per machined workpiece surface can be reduced. Under certain circumstances, this reversing operation can lead to better machining results, even with special workpiece geometries.
  • the direction of rotation of the workpiece is reversed in the reversal of the direction of movement of the finishing belt, so that a machined workpiece surface can always move in opposite directions to the feed direction of the finishing belt.
  • particularly high cutting speeds can be achieved, whereby the cycle times can be shortened.
  • a variant of the method is characterized in that the finishing belt cyclically first moves during the first movement phase by a first feed length in the direction of the first tape roll during processing of a workpiece surface and after reversing the direction of movement during a second movement phase by a second feed length in the direction of second tape roll is moved, wherein the second feed length is greater than the first feed length by a defined feed length difference.
  • This special process kinematics is also referred to below as the "pilgrim step method".
  • cyclic in this context means that the machining of the workpiece surface is carried out in one or more movement cycles, wherein a movement cycle contains movement phases in both possible directions of advance, in that the second feed length is greater than the defined feed length difference
  • First feed length it can be achieved that at the beginning of a subsequent cycle of motion is always a schneidfreudiger tape section is available .Thus largely continuous engagement conditions for the finish machining can be ensured, so that even at very high quantities - - Without tape exchange over long processing times a very high quality processing can be ensured.
  • the finishing belt is preferably brought out of engagement with the workpiece after reaching the initial belt position before the first movement phase in such a way that the finishing belt does not undergo material-removing engagement with the workpiece during the feed by the feed length difference.
  • the finishing belt is then each a fresh, previously unused finishing tape section available.
  • the feed lengths and the feed speeds in the two opposite directions of movement are matched to a desired removal on the workpiece surface such that the workpiece surface is processed during the duration of a single movement cycle.
  • the complete processing stage for the workpiece surface then has only one movement cycle.
  • the movement phase of the fresh-tape feed can be synchronized with the workpiece change at the end of the second movement phase of a movement cycle, whereby the cycle times per processed workpiece surface can be kept short.
  • the finishing belt is moved with a feed rate that is substantially uniform (outside of unavoidable acceleration phases) in order to arrive at - - uniform component rotation to achieve a uniform cutting speed.
  • various measured variables can be detected individually or in combination and fed back to the control device for the purpose of controlling the motion profiles.
  • a measurement of the drive torque of a first roller drive and / or a second roller drive can be carried out with the aid of suitable sensors.
  • sensors for winding diameter determination a measurement of the tape winding diameter at the first tape roll and / or on the second tape roll can be performed.
  • a measurement of the angular velocity of a rotation of the first belt roll and / or the second belt roll can be carried out.
  • It is also possible to provide a direct measurement of the tape feed speed eg with a mechanical measuring device (eg with a measuring wheel which rolls on the finishing belt) or with an optical measuring device, which may have a laser, for example.
  • a variant of the method is characterized in that in the first movement phase, the first tape roll is driven by a first roller drive and pulls finishing tape from the second tape roll and the second tape roll by means of a second roller drive generates a braking torque to produce a belt tension. In the opposite movement in the second phase of movement then the roles of the tape rolls are reversed.
  • the tape feed is thus achieved by driving the tape rolls.
  • a tape feeding device separate from the tape rolls, which has for example in front of and behind the engaging region counter-rotating pairs of driving rollers each defining a gap through which the finishing belt to be conveyed is passed.
  • the invention also relates to a device for finish machining of curved workpiece surfaces on workpieces by means of a finite finishing belt coated with cutting means.
  • the device has a rotating device for generating a rotational movement of the workpiece about a workpiece axis and at least one finishing unit, a first tape roll for receiving a first end portion of a finishing tape, a second tape roll for receiving a first end portion opposite the second end portion of the finishing tape and a pressure device for pressing the finishing tape to a workpiece surface to be machined.
  • the device has a first roller drive coupled to the first belt reel for reversibly rotating the first belt reel, a second reel drive coupled to the second belt reel for reversibly rotating the second reel and a control device for coordinated activation of the first and second reel drives.
  • the device for carrying out these variants can be configured by means of suitable settings or programming of the control device. If necessary, however, conventional belt finishing methods can also be carried out with the aid of the device.
  • the device may be programmed so that the roller drives during the processing of a workpiece surface do not drive the tape rolls, so that the finishing tape rests during processing. By activating the roller drives, the finishing belt can then be advanced during processing breaks for the supply of fresh belt. It is also possible to create a long - - To produce seed tape feed, which makes virtually no contribution to the effective cutting speed on the workpiece.
  • the invention also relates to a finishing unit which can be used in this device or in other devices.
  • the finishing unit has a first tape roll for receiving a first end portion of a finishing tape, a second tape roll for receiving a second end portion of the finishing tape opposite the first end portion, and a pressing means for pressing the finishing tape against a workpiece surface to be processed.
  • the finisher unit has a first roller drive coupled to the first belt reel for reversibly rotating the first belt reel and a second reel drive coupled to the second belt reel that can be controlled separately from the first roller drive for reversibly rotating the second belt reel.
  • the roller drives can be connected or connected to a control device for coordinated activation of the first and the second roller drive. This control device can be integrated into the finisher unit.
  • the finisher unit does not have its own control device, but is set up, for example, by means of suitable interfaces (eg connection sockets, plugs, etc.) for interacting with an external control unit, for example the control unit of a processing machine.
  • the first and the second roll of tape as well as elements of the first and the second roller drive and the pressure device can be arranged on a common carrier element, so that they can be exchanged and replaced in the manner of a belt module.
  • Such a finisher unit can have a fastening device for fastening the finisher unit to a processing machine, which in turn has a workpiece holding device and a rotary drive for workpiece rotation.
  • the finishing unit may be constructed so that it can be mounted on a lathe. In this way, the lathe can be converted to a belt finishing machine.
  • Fig. 1 shows an embodiment of a belt finishing machine with a plurality of finishing units
  • Fig. 2 shows a plan view of an embodiment of a Finishech with two separately and each driven in two directions of rotation tape rolls
  • Fig. 3 shows a side view of the finisher unit of Fig. 2;
  • Fig. 4 shows a schematic representation of a Finishech with means for controlling the movements of the tape rolls
  • 5 shows a schematic diagram for explaining the time course of the tape feed in a variant of a vocational step method
  • FIG. 6 shows a schematic diagram for illustrating the cutting ability of the finishing strip, which varies stepwise along a finishing belt
  • Fig. 7 shows an embodiment of a pressure device with a pressure roller
  • Fig. 8 shows an embodiment of a pressure device with two band deflection rollers.
  • FIG. 1 shows an embodiment of a device 100 hereinafter referred to as a strip finishing machine 100 for finishing curved workpiece surfaces of workpiece sections on workpieces by means of abrasive, flexible finishing tapes.
  • the band finishing machine is set up in the example for a simultaneous finish machining of a plurality of axially adjacent cylindrical and non-cylindrical peripheral surfaces of a workpiece 110 in the form of a camshaft. Workpiece surfaces on other wave-shaped workpieces, for example on crankshafts, can also be machined with such a belt finishing machine.
  • the workpiece 1 10 is clamped with a horizontal workpiece axis 1 12 in a workpiece holding device, whose elements are arranged on the top of the machine inenbetts 102 of the belt finishing machine.
  • the workpiece holding device comprises a rotating device 122 with a horizontally oriented workpiece spindle, which has at its end a clamping device for clamping one end of the workpiece. The opposite end of the workpiece is held by the tip of a tail stock 124.
  • the rotating device is designed for a reversing operation, so that the workpiece can be rotated in two opposite directions of rotation with infinitely adjustable speed.
  • an optionally switchable oscillation device with which the workpiece can be displaced as needed in an axially short-stroke oscillating movement with strokes in the order of a few millimeters.
  • the oscillator has a drive independent of the workpiece rotation, which, e.g. may contain a pneumatic or electromechanical vibrator.
  • an optionally switchable oscillation device can be provided, which can set a finisher unit or a part of a finishing unit in an oscillation running parallel to the workpiece axis, so that a relative oscillation contributing to the cutting speed results between the finishing belt and the workpiece surface.
  • the belt finishing device has a plurality (seven in the example in the example) juxtaposed finishing units 150, which are arranged in series above the workpiece holding device and the workpiece clamped therein.
  • FIGS. 2 to 6 show schematically details of the finishing units.
  • the finishing units are secured to two vertically spaced, horizontal support rods 104A, 104B, the ends of which are attached to vertical uprights 106A, 106B mounted on the machine bed 102.
  • the axial positions of the interchangeable finishing units on the handrails are infinitely adjustable to adapt to different workpiece geometries.
  • the finishing units 150 are each very narrow, so that it is possible to machine all the peripheral surfaces of the camshaft to be machined at the same time by the finishing units threaded onto the support rods 104A, 104B, both the Rotationsunsymmetrischen cams, and the rotationally symmetric cam bearing surfaces. - -
  • Each of the finishing units is arranged to use a finite (i.e., non-continuous) finishing tape 15.
  • the finite length of the finishing belt is normally several meters, for example more than 10 meters or more than 50 meters.
  • the length can be 100 m to 150 m or more, for many applications belt lengths up to 300 m are sufficient.
  • the bandwidth can be on the order of one or a few centimeters, possibly even less. In general, the bandwidth is in the range of 2 mm to 150 mm, in particular in the range of 4 mm to 100 mm.
  • a finisher unit 150 has a flat, substantially plate-shaped and vertically mounted support element 152 made of steel, which has in the reinforced center section two overlying through-holes 154A, 154B for passing through the support bars 104A, 104B.
  • a finisher unit 150 has a flat, substantially plate-shaped and vertically mounted support element 152 made of steel, which has in the reinforced center section two overlying through-holes 154A, 154B for passing through the support bars 104A, 104B.
  • two tape rollers 155- 1, 155-2 are rotatably mounted with parallel axes of rotation.
  • a first tape roll 155-1 serves to receive a first end portion of the finishing tape.
  • the first end portion may be attached to the roll core or fixed non-slip by firm winding.
  • the second end portion opposite to the tape direction is wound on the roll core of a second tape roll 155-2 so that the finishing tape passes between the first tape roll and the second tape roll.
  • Elements of a pressure device 160 are mounted on the carrier element 152 in the middle between the belt rollers and underneath the through-holes 154A, 154B.
  • the pressure device is used for pressing the finishing tape to a peripheral surface of the workpiece to be machined such that the occupied with bonded cutting grains front - -
  • the finishing belt can finish the peripheral surface under a defined contact pressure or with a defined surface pressure.
  • the pressure device 160 has a single pressure roller 162, which is rotatably mounted on the carrier element 152 and can be displaced vertically to a limited extent against the force of a spring device.
  • the finishing belt runs between the pressure roller and the peripheral surface of the workpiece to be machined, with a more or less narrow, substantially linear engagement region for the material removal between the abrasive front side of the finishing belt and the workpiece outer surface.
  • the tape rolls 155-1, 155-2 can be driven separately in each case in two directions of rotation.
  • a first roller drive 158-1 is provided for reversibly rotating the first belt roller 155-1 and a second roller drive 158-2 for reversibly rotating the second belt roller 155-2.
  • the mutually movable parts of the electric drives are each housed within the roll core of the respective roll of tape.
  • servomotors with particularly high torque are used as roller drives.
  • the roller drives are connected via electrical lines to the control device 180 of the band finishing machine (FIG. 4). As a result, a coordinated control of the first and the second roller drive is possible.
  • Each of the belt rollers 155-1, 155-2 is assigned its own measuring device M1 or M2 for determining the current torque of the roller drive.
  • in addition to the roller drive to each of the tape rolls also includes a Drehieremesssys- system with sensors W1 and W2 to determine the current angular velocity or speed of the respective roll of tape and a sensor D1 or D2 for measuring the diameter of each on the core - - The tape roll wound tape roll.
  • These measuring devices and the control device 180 belong to a control device, which allows control of the feed rate during finish machining.
  • the finisher unit forms a relatively easily replaceable belt module.
  • the band finishing machine can be adapted very flexibly to different workpiece types and workpiece geometries.
  • one of the tape rolls can specify a desired speed for the machining, so that the finishing tape is moved in the direction of this tape roll with a feed rate suitable for substantial material removal, where it is rolled up or wound up there.
  • This tape roll may also be referred to as a pull roll or drive roll.
  • the other reel simultaneously tensions the finishing belt by producing a defined braking torque.
  • This tape roll can also be referred to as a brake roller.
  • the first tape roll 155-1 serves as a pull roll, by the roller drive 158-1 of which a continuous tape feed in the direction of the first tape roll is produced.
  • the second strip roll 158-2 or its roller drive generates the counter-moment or braking torque. - Ment in such a way that the desired finish band tension is maintained.
  • the dashed line represents the finishing belt before the start of the winding on the first roll of tape, the solid line the course of the finishing belt after complete winding on the first roll of tape.
  • the tape feed takes place from right to left, ie from the second tape roll in the direction of the first tape roll.
  • Both roller drives are designed for a Reversier horrinsky horrinsky horrinsky satu satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky satusky sat.
  • the maximum feed rates may be on the order of at least 0.5 m / s, for example in the range of 0.5 m / s to 4 m / s.
  • maximum feed rates in the range of 1 m / s to 2 m / s are advantageous.
  • the feed rates are infinitely adjustable, which can be used if necessary, with higher feed rates up to, for example, 3 m / s or even 4 m / s.
  • the tape speed (feeding speed) can be kept substantially constant throughout a winding operation by gradually reducing the number of revolutions of the tape roll used as a drawing roll as the diameter of the tape roll on the drawing roll gradually increases.
  • the measurement of the drive torque that is, the torque on the tape roll serving as a tension roller, can be used, for example, to detect the end of the tape, ie the moment from which no further tape should or can be unwound from the trailing brake roller.
  • a reversal of the direction of pull roller and brake roller can be automatically effected.
  • the detection of the output torque ie the torque applied to the brake roller
  • the driven-side tape roll diameter (tape roll diameter at the serving as a brake roller tape roll) can be used for tape consumption level control.
  • the drive-side angular velocity or rotational speed that is to say the angular velocity or rotational speed of the tension roller, can be processed for the belt feed control.
  • the output side angular velocity or speed can also be used in the context of tape feed control and possibly also for tape breakage control.
  • the finish belt advance is represented by the zigzag line where the top-to-bottom sections have a tape feed in the forward direction (arrow "V") and in time
  • a tape feed in the opposite reverse direction (arrow "R") ie reversing operation
  • the oblique arrow VSM represents the time-averaged tape feed.
  • the abscissa represents the parameter FBZ describing the finishing tape within one cycle of motion.
  • the ordinate corresponds to the parameter KTZ, which describes the contact time over which a corresponding finishing band section has already been in a machining contact with a workpiece surface.
  • Tape wear is also sometimes quantified with the parameter "Coverage Level", which represents the number of already existing cutting overflows of a strip section.
  • “Coverage Level” represents the number of already existing cutting overflows of a strip section.
  • This forward direction runs in the example in the direction of the first roll of tape, which serves as a pull roll, but also the umgege- - - reversed variant (second tape roll as a pull roll) is possible.
  • the second tape roll serves as a tension roller and the first tape roll maintains the tape tension.
  • the feed rate of the finishing belt is in each case so large that the tape feed makes a substantial contribution to the material removal.
  • the feed rate may be, for example, in the order of 0.5 m / s to 2 m / s.
  • the tape feed ratio of feed to return ie the ratio of the first feed length in the direction of the first tape roll and the second feed length in the direction of the second tape roll, is preferably adjusted so that at the beginning of processing, ie at the beginning of processing a new peripheral surface, always fresh grain or A previously unused section of tape is available.
  • This is realized in that the finishing strip is disengaged from the workpiece immediately after processing (at time t3) and that the finishing strip is then advanced by a defined band length amount until time t4. It is therefore nachgePolt before the start of processing on the next workpiece WS2, which is at time t4, a defined piece of fresh tape.
  • This strip length corresponds to the strip consumption of the strip finishing device per cycle and results from the fact that the feed length conveyed during the second movement phase is greater by a defined feed length difference than that in the first movement phase (between - - t1 and t2) used first feed length.
  • the feed length difference AVS in this case corresponds to the tape consumption per cycle.
  • the total time between the start of the processing of a peripheral surface at the time t1 to the end of the second movement phase (feed in the reversing direction) of the processing of this peripheral surface at the time t4 is referred to as a "movement cycle.”
  • the first movement cycle Z1 is the processing of the associated with the first workpiece section WS1.
  • a subsequently machined second workpiece section WS2 is processed in a second processing cycle Z2, which immediately follows the first movement cycle.
  • the processing begins again with a fresh, unused section of tape, since in the previous first cycle Z1 in the final phase (between times t3 and t4) a fresh piece of tape was nachge organizert.
  • this band section is adjoined by an adjacent band section, which was already used during the processing of the preceding workpiece section. This is followed by a band section which has already been used in the machining of two preceding workpiece sections and so on.
  • the machining time already provided by a finishing belt section which is represented in FIG. 6 by the contact time KTZ and which can alternatively also be described by the parameter covering degree, starts from the beginning of a movement cycle until the belt reversal point, ie until the feed direction is reversed the time too. As shown in Fig. 6, this increase in jumps, wherein the plateau length of the respective stages (with step height ⁇ ) the predefined amount of freshly tracked finishing tape per processing, ie the tape consumption of - -
  • substantially identical engagement conditions prevail.
  • substantially the same machining quality can be realized on all machined peripheral surfaces.
  • the vocational step kinematics can thus on the one hand provide high removal rates and, on the other hand, at the same time substantially constant removal conditions. Even for problematic components, such as components with very small diameters and / or components with non-circular peripheral sections, high cutting speeds can be realized.
  • the finished finishing belt has the same belt state for each processing cycle in view of the overflows already made (contact time), whereby a constant quality of processing can be ensured.
  • the high consistency of the quality of the machined peripheral surfaces even for very large series of workpieces, represents a major technological advantage of this special process kinematics over conventional belt finishing methods.
  • the feed length difference AVS is usually only a small fraction of the total length of the finite finishing tape, for example less than 1 percent or even less than 5 parts per thousand. In this way, many movement cycles can be performed with a single finishing belt of finite length before an exchange must be made.
  • the strip feed progression shown schematically in FIG. 5 corresponds to the retracted operation of the strip finishing device.
  • adjustment possibilities are provided on the control device in order, if necessary, to apply contact factors and / or tape feed speeds with correction factors. As a result, largely equivalent machining results can also be achieved in the run-in mode.
  • the belt speed can be controlled by means of the return of the angular diameter in favor of a continuous tape feed speed.
  • the pressure device can be designed differently depending on the type and geometry of a workpiece section to be machined.
  • the pressure device 160 has a single pressure roller 162, by means of which the finishing belt is pressed against the peripheral surface of the workpiece section.
  • the engaging surface which is decisive for the material removal is narrow in a linear manner.
  • Pressure device with a pressure roller can both in the processing of rotationally symmetrical peripheral surfaces (see FIG ..
  • FIG. 7 for example, the processing of the peripheral surface of a cam 11 is shown.
  • the non-circular peripheral surface of the cam is curved convexly everywhere in the illustrated example.
  • pressure rollers and rotationally asymmetric peripheral surfaces can be edited, which are curved in sections concave, in which case the radius of the pressure roller should be smaller than the smallest radius of curvature of a concave peripheral portion.
  • a cam or other device is provided in the region of the pressure roller, which converts the rotational movement of the (otherwise non-driving) pressure roller caused by the movement of the finishing belt into a movement that oscillates parallel to the axis of rotation of the pressure roller.
  • the embodiment of a pressure device 660 shown schematically in FIG. 8 has two guide rollers 664, 666 mounted on the carrier element 652 and rotating the finishing belt between the two belt rollers in such a way that a freely stretched belt section remains between the deflection rollers, as long as the finishing belt is not is engaged with a workpiece peripheral surface.
  • the finishing belt lies flat against the workpiece outer surface over a certain circumferential angular range, so that surface contact with increased removal rate can be achieved.
  • the pressure force can be specified via the belt tension. If necessary, an additional, mechanically acting on the band back pressure device provided in the wrap - - be.
  • Numerous configurations of pressure devices are possible, for example, pressure devices according to International Patent Application Publication No. WO 2009/049868 A1, the relevant disclosure content of which is incorporated by reference into the content of this description.
  • the exemplary embodiments explained in conjunction with the figures are designed for machining curved workpiece surfaces (peripheral surfaces) on the outside.
  • the finish band width may correspond approximately to the axial width of the peripheral surfaces to be machined (e.g., bearing surfaces, cam outer surfaces).
  • the finishing tape is then pressed against the inner surface by means of a separate pressure device, e.g. by means of a pressure roller.
  • finishing unit Since, in the case of the finishing unit, a significant proportion of the cutting speed acting on the workpiece surface in the engagement area results from the tape feed speed, it is also possible, if necessary, to machine a workpiece resting during machining by finishing. It is also possible in principle to machine a plane surface, ie a flat workpiece surface, by means of a finishing unit with two actively reversibly drivable tape rolls.
  • the Finishech example stand firmly while the workpiece by means of a cross table or the like. is linearly advanced in one or more directions and a pinch roller presses the moving at high speed finite finishing tape on the plane to be machined plane.
  • the plan finish machining can be performed with or without relative oscillation between finishing belt and workpiece surface.
  • a belt finishing machine may have a single finishing unit or multiple finishing units as needed and machining task.

Abstract

L'invention concerne un procédé de finition de surfaces courbées de pièces utilisant une bande de finition finie qui est pourvue de moyens de découpe et s'étend entre un premier tambour et un second tambour. Une extrémité de la bande de finition est fixée sur l'un des tambours et l'autre extrémité sur l'autre tambour. La bande de finition est pressée dans une zone de mise en contact contre une surface de la pièce et la pièce est amenée en rotation autour d'un axe de pièce. La bande de finition est tout d'abord déplacée pendant une première phase de déplacement à une première vitesse d'avance adaptée à un enlèvement de matériau sur une première longueur d'avance en direction du premier tambour et, après inversement du sens de déplacement, pendant une seconde phase de déplacement à une seconde vitesse d'avance adaptée à un enlèvement de matériau sur une seconde longueur d'avance dans la direction du second tambour. Un enlèvement de matériau peut être effectué dans les deux sens d'avance à une vitesse de découpe élevée.
PCT/EP2011/070056 2010-11-17 2011-11-14 Procédé et dispositif de finition de surfaces courbées de pièces au moyen d'une bande de finition WO2012065949A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2011800651971A CN103402703A (zh) 2010-11-17 2011-11-14 用于借助于精整带精加工工件上的弯曲工件表面的方法及装置
HU1300374A HU229618B1 (en) 2010-11-17 2011-11-14 Method and device for finish machining curved workpiece surfaces on workpieces by means of a finsish belt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010052311A DE102010052311A1 (de) 2010-11-17 2010-11-17 Verfahren und Vorrichtung zur Finishbearbeitung gekrümmter Werkstückoberflächen an Werkstücken mittels Finishband
DE102010052311.9 2010-11-17

Publications (1)

Publication Number Publication Date
WO2012065949A1 true WO2012065949A1 (fr) 2012-05-24

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CN (1) CN103402703A (fr)
DE (1) DE102010052311A1 (fr)
HU (1) HU229618B1 (fr)
WO (1) WO2012065949A1 (fr)

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EP2823934B1 (fr) * 2013-07-09 2015-02-18 Supfina Grieshaber GmbH & Co. KG Dispositif d'usinage de précision d'une surface périphérique de pièce et procédé de fonctionnement du dispositif
DE102013222359B4 (de) * 2013-11-04 2018-05-09 Gebr. Heller Maschinenfabrik Gmbh Verfahren zur Feinbearbeitung von Wellen, insbesondere Kurbelwellen, sowie Feinbearbeitungsanlage dafür
DE202014000094U1 (de) * 2014-01-13 2014-02-18 Supfina Grieshaber Gmbh & Co. Kg Andrückeinrichtung
CN107745308A (zh) * 2017-11-22 2018-03-02 东莞亦准自动化科技有限公司 一种新型多刀柄磨抛机
CN109551345B (zh) * 2018-12-29 2021-03-02 广西壮族自治区农业科学院经济作物研究所 一种花生壳网纹去除装置
CN113414665B (zh) * 2021-08-23 2021-11-09 江苏中科云控智能工业装备有限公司 基于数据分析自动更换清理工件的压铸件去毛刺装置

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EP1514643B1 (fr) 2003-09-12 2007-05-02 Thielenhaus Technologies GmbH Procédé pour l'usinage de finition de la surface de révolution d'arbres
WO2009049868A1 (fr) 2007-10-16 2009-04-23 Nagel Maschinen- Und Werkzeugfabrik Gmbh Dispositif de pression d'éléments coupants, dispositif et procédé de finition de surfaces périphériques de parties cylindriques de pièces d'usinage
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EP1514643B1 (fr) 2003-09-12 2007-05-02 Thielenhaus Technologies GmbH Procédé pour l'usinage de finition de la surface de révolution d'arbres
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US10166648B2 (en) 2015-11-09 2019-01-01 Supfina Grieshaber Gmbh & Co. Kg Finishing belt device and method for finishing a workpiece

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HUP1300374A2 (en) 2013-09-30
DE102010052311A1 (de) 2012-05-24
HU229618B1 (en) 2014-03-28
CN103402703A (zh) 2013-11-20

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