EP4182113A1 - Procédé d'usinage de dentures - Google Patents

Procédé d'usinage de dentures

Info

Publication number
EP4182113A1
EP4182113A1 EP21746708.3A EP21746708A EP4182113A1 EP 4182113 A1 EP4182113 A1 EP 4182113A1 EP 21746708 A EP21746708 A EP 21746708A EP 4182113 A1 EP4182113 A1 EP 4182113A1
Authority
EP
European Patent Office
Prior art keywords
machining
workpiece
change
toothing
tooth
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.)
Pending
Application number
EP21746708.3A
Other languages
German (de)
English (en)
Inventor
Ralf SCHMEZER
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.)
Gleason Pfauter Maschinenfabrik GmbH
Original Assignee
Gleason Pfauter Maschinenfabrik 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 Gleason Pfauter Maschinenfabrik GmbH filed Critical Gleason Pfauter Maschinenfabrik GmbH
Publication of EP4182113A1 publication Critical patent/EP4182113A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
    • B23F5/12—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting
    • B23F5/16—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting the tool having a shape similar to that of a spur wheel or part thereof
    • B23F5/163—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting the tool having a shape similar to that of a spur wheel or part thereof the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F19/00—Finishing gear teeth by other tools than those used for manufacturing gear teeth
    • B23F19/10—Chamfering the end edges of gear teeth
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/182—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control
    • G05B19/186—Generation of screw- or gearlike surfaces
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
    • B23F23/1218—Checking devices for controlling workpieces in machines for manufacturing gear teeth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
    • B23F5/20—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by milling
    • B23F5/202—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by milling the tool having a shape similar to that of a gear or part thereof, with cutting edges situated on the tooth contour lines
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45214—Gear cutting

Definitions

  • the invention relates to a method for gear machining, in which, for a series of workpieces with the same target geometry, gearing is produced or machined on a respective workpiece in a first machining process, and in a second machining process with a machining tool, a supplementary tooth shaping of the gearing resulting from the first machining process , in particular a chamfering of a tooth front edge of this toothing, is carried out in a relative positioning to the same.
  • Such methods are of course well known in the prior art, for example through large-scale production of gear wheels by hobbing with subsequent chamfering with a selected chamfering technique, which can be, for example, chamfering hobbing as disclosed in WO 2019/161942 A1, or others, in particular cutting ones Chamfering methods such as chamfer-cut (EP 1 495 824 B1), skiving chamfering (WO 2015/014448 L1), or others.
  • Gear cutting machines are already so sophisticated that the operator enters the parameters characterizing the desired chamfer, such as chamfer width and/or angle, into the control, and the machine control independently calculates the machine axis settings required for chamfering for the second machining.
  • a batch of workpieces with a large number of pieces is usually only processed when the gearing of the first machining is within the desired tolerance limits compared to the target gearing.
  • the gearing is usually measured at regular intervals in order to monitor the maintenance of the tolerances. If it turns out that a measured value describing the bevel shape moves to a tolerance limit, for example the bevel width is too small, the operator can correct it by entering a bevel width that is higher by the difference to the target bevel width instead of the actual target width, so that the “virtual too large chamfer width” controlled process produces the actually desired chamfer.
  • modern machine controls are already so sophisticated that only a measured value from the measured chamfer has to be entered into the machine control, which then independently calculates the deviation from a specified target value and makes the necessary corrections for the adjustment.
  • the invention is therefore based on the object of improving a method of the type mentioned at the beginning in the direction of reducing the relative deviation of individual results of the individual tooth shapes of workpieces in the workpiece batch from one another.
  • control of the second machining involves a change in a workpiece property that is in particular independent of the first machining and/or a setting of the first machining processing, in particular with reference to a respectively specified reference, is at least partially automatically detected and performs the relative positioning as a function of the detected change.
  • the second machining thus takes place as at least partially automatic, adaptive, supplementary tooth shaping in response to the pre-machining that changes the position of the tooth edge.
  • the respective setting for the previous workpiece can be used as a reference, or absolute values of the changed values can be compared with specified absolute references, or a combination of both variants.
  • the first machining is soft machining, in particular hobbing, skiving or shaping.
  • a particularly preferred type of first machining is hobbing, however, possibly due to interfering contours that make hobbing difficult or prevent it, then primarily hob skiving is preferred, but hobbing can also be used.
  • the second processing is a cutting chamfering and the target geometry in this respect includes a predetermined chamfer shape and size.
  • Cutting chamfering has the advantage of avoiding/reducing so-called secondary burrs compared to the rolling pressure and burrs that are still widely used.
  • the second machining is carried out in a rolling method, in particular in the contact kinematics of the hobbing.
  • single-flank interventions are preferred; for preferred intervention kinematics, reference is made to the kinematics disclosed in WO 2019/161942 A1.
  • the detected change includes a modification of the flank line of the toothing.
  • changes recorded in the form of a flank line angle correction of the first machining are notified, since the latter are related to helix angle changes and center distance changes, e.g. when hobbing as the machining type of the first machining.
  • the recorded change includes a modification of the tooth thickness of the toothing.
  • a tooth thickness modification is also related to a change in the center distance.
  • the change includes a modification of the workpiece axis-related axial position of the front tooth edge of the toothing.
  • the workpiece axis-related axial position of the tooth end edge usually plays a subordinate role when generating the toothing, but not in chamfering processes or the generation of roofing, in which the type of workpiece clamping is changed to improve accessibility, as described in more detail below.
  • a clamping for the second machining is set in such a way that the end faces of the toothing produced in the first machining are accessible to the chamfering tool and are not prevented by clamping.
  • the change includes a radial infeed of the tool of the first machining/the center distance of the rotary axes of the first machining.
  • the change can thus be detected by the controller preferably at the level of the machine axis settings themselves, but also (see above) at the level of the properties that can be determined directly on the workpiece, such as flank line progression and/or gear thickness.
  • the change includes a swivel angle of the tool of the first toothing, and/or a superimposition of machine axes of the first machining, resulting in a flank modification, such as a tangential (Y) or axial axis (Z), possibly additional rotations (AC, AB ).
  • a pivot angle change, if made, will usually occur during hobbing or skiving.
  • machining point shifts can also be taken into account by changing a tangential axis and additional rotations.
  • a measurement is made on the workpiece with regard to a change affecting the clamping height, the result of which is accessed by the controller.
  • the clamping height of one or both face planes of the toothing produced in the first machining is monitored during clamping for the second machining during a measurement, and the control in particular automatically receives access to the actual clamping height or deviation of the workpiece from the target clamping height.
  • the axial distance of a known position of the sensor plane to the plane of the upper flat surface of the toothing (chamfering plane) is determined by a sensor.
  • the determination of a measured variable (eg b u , see FIG. 2 below) determining the deviation from the desired clamping height can already take place before the clamping for the second machining. It preferably takes place parallel to the main time with regard to the first processing, for example in the case of a workpiece automation of bringing the workpieces to the first processing.
  • the measured variable assigned to the workpiece can be stored in the controller.
  • n preferably being at least 5, in particular at least 10.
  • At least one change is determined during the detection without recourse to specific measurement on the workpiece from changed machine axis settings of the first machining.
  • changes in the relative positioning can be made at least for a proportion of in particular more than 30%, preferably more than 50% of the processed workpieces in the series, the detection of which is not based on a specific measurement recorded on the workpiece, in particular on the processing result of the first processing.
  • the controller is designed for a basic setting for carrying out the second machining according to an input of parameters of the target geometry and the machining tool, as well as, if applicable, clamping parameters. The operator is thus still able to enter the desired bevel parameters in advance for the second machining.
  • the control parameters of the basic setting are changed and not the input parameters.
  • the machine control would be able to calculate the changes programmed in by the experienced operator in the conventional prior art and make these available to the operator for input.
  • the relevant input parameters can remain at the desired value and the change in relative positioning is aimed at maintaining the desired parameters as entered by reacting to the detected changes at least in part, in particular fully automatically.
  • the at least partially automatic detection of the change in the workpiece property and/or the circumstance of the first machining compared to a respectively specified reference is preferably a fully automatic detection.
  • the at least partially automatic detection includes semi-automatic applications such that a machine operator is prompted by the machine control to make a change detected by the machine control and to adjust the relative positioning calculated therefrom displayed, whereby the machine operator can confirm or reject the tracking.
  • the machine operator makes a correction for the first machining in a correction dialog of the machine based on the generated and measured helix angle
  • the chamfering should already be corrected for the first machining, e.g. hobbing, by correction generated gearing can be set and the machine operator will confirm the corresponding tracking.
  • corrections set during the first machining for example fine-tuning after measuring other workpieces or a targeted correction after a small number of machining pieces in the de facto new tool condition.
  • the clamping height monitoring is implemented, a change in this regard is tracked fully automatically, whereas the machine control system, which responds to changes in the settings of the first machining operation, works semi-automatically with regard to carrying out the relevant tracking after the process setup for a batch of series production has been completed.
  • the invention also relates to a control program which, when executed on a gear cutting machine, controls the machine to perform a method according to one of the aforementioned aspects, as well as a gear cutting machine controlled to perform the method.
  • the second machining can take place on the gear cutting machine itself, on a machining station assigned to it, or via a machining station automatically coupled thereto, but also on a completely separate machine. Nevertheless, care is taken to the effect that the circumstances of the first Processing recorded against the respective reference and the control of the second processing can access it.
  • the processing unit has means for sensory detection of the center of the tooth gap and/or the clamping height of the face plane in which the tooth edges to be chamfered are located (in the case of end faces of the gearing that are not orthogonal to the axis of rotation of the gearing, the clamping height of the axial position of the tooth tips, for example, can serve as a reference for the clamping height).
  • the information required for the clamping height can be derived, for example, from the axial distance between an end face of the toothing and the level of the sensor.
  • Fig. 1 is a view showing process design parameters
  • Fig. 2 shows representations of a workpiece blank
  • FIG. 3 shows a schematic illustration of an additional rotation in the case of axial displacement of a toothing
  • Fig. 4 is a schematic representation of the tooth edge position with different front edge heights
  • Fig. 5 is a representation of the tooth edge position with different tooth thickness
  • Fig. 6 is a schematic representation of the position of the tooth edge in a tooth trace modification
  • FIG. 2a a typical blank 40 is shown in perspective view in FIG. 2a.
  • this can have a ring-cylindrical outer area 43, from which the subsequent toothing is produced, and a disc-shaped body 41, which is pierced by a through hole 42 and lies in a plane orthogonal to the axis of rotation of the toothing.
  • the axially outer ends in the form of an upper end face 433 and lower end face 434 of the outer annular body 43 extending axially over the gear wheel width b may be spaced from the end faces of the inner annular body 41 .
  • this distance is denoted as b 0 (width of turning at the top) and b u (width of turning at the bottom).
  • the position of the teeth relative to the table axis is first determined with a sensor and thus also the tooth edges to be machined lying in the upper and lower end faces 433, 434. Knowing the axial distance of the upper end face of the gearing, e.g. to the level of the sensor, the gearing can be positioned, for example, via the machine table axis in such a way that, viewed axially, the tooth edges on the upper face 433 can be turned into the desired position, also for chamfering the lower face 434.
  • a four-fold tuple consisting of pivot angle h, center distance DC, distance to the center of the machine DU, distance to the chamfering plane DZ, i.e. for the plane of the upper end face 433 (h3, DC 3 , DU 3 , DZ 3 ), respectively at the bottom plane of face 434 (h 4 , DC 4 , DU 4 , DZ 4 ).
  • Fig. 4 the situation of the position of the tooth edges at different heights of the front edges is shown again.
  • the nominal dimension of the gear wheel width b lies between a minimum gear wheel width b min and a maximum gear wheel width b max .
  • the position of the pointed edge of the left flank at the nominal tooth width is denoted by B, that of the blunt edge of the right flank by E.
  • B max the position of the pointed edge of the left flank at the nominal tooth width
  • C or F For deviations to a larger toothing width (b max ), these positions are marked with C or F, and for smaller toothing widths with A and D.
  • second processing post-processing
  • position changes can be taken into account that are independent of the previous toothing production itself and can therefore also occur if the gearing itself would be 100% ideal for nominal dimension production.
  • a change in the position of the tooth edges can also result from changes, e.g. in the tooth thickness, resulting from the gearing.
  • This is illustrated in Fig. 5, in which B and E designate the position of the pointed edge of the left flank and the blunt edge of the right flank at nominal tooth thickness, which are shifted to G, K in the case of thinner teeth in the plane orthogonal to the workpiece axis of rotation for thinner teeth or H, J for thicker teeth.
  • FIG. 6 a change of position of the tooth edge with a toothing formed in the production of tooth trace modification f H p.
  • the position of the nominal positions B, E changes to L, N in the case of a ⁇ modification, and to a position M, P in the case of a ⁇ + modification. If only the crowning changes (symmetrical tooth trace modification cp), the position of the nominal positions B, E does not change.
  • FIG. 4 denotes the pointed edge of the left flank in the nominal position
  • E the blunt edge of the right flank in the nominal position
  • the profile V of the resulting tooth gap center with helix angle ß correlates with the resulting position U of the pointed position of the left flank and the resulting position Z of the blunt edge of the right flank, with the axial distance between the upper end face 433 according to the nominal dimension to the upper end face 3" at the level of U, Z is denoted by DZ 0.
  • the index "3" stands for the area 433.
  • the latter contributions AC serve the purpose of rotating the workpiece tooth gap at the level of the chamfering plane by rotating the workpiece in the center of the machine, and consists of the rotation from the sensor plane to the original plane 3, D0 3 , an additional rotation DO rz with any change in the helix angle and the additional torsion ACo, which takes into account the transition from plane 433 to plane 3".
  • the above explanations relate primarily to the upper surface 433, for the lower surface 434 the procedure is the same.
  • machine axes on the workpiece side can be repositioned with respect to individual axes instead of machine axes of the chamfering tool, which lead to the same relative positioning as the determined absolute positioning of the chamfering tool.
  • skiving or gear shaping could also be used, and the changes in the first machining that lead to the change in center distance and/or change in the helix angle could be taken as a basis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Gear Processing (AREA)

Abstract

L'invention concerne un procédé d'usinage de dentures, dans lequel, pour une série de pièces ayant une géométrie cible identique, une denture est produite ou usinée sur chaque pièce lors d'une première manœuvre d'usinage et une mise en forme dentaire supplémentaire de la denture résultant de la première manœuvre d'usinage est effectuée à l'aide d'un outil d'usinage lors d'une seconde manœuvre d'usinage, en particulier le chanfreinage d'un bord d'extrémité dentaire de cette denture, dans une position relative par rapport à ce dernier, un dispositif de commande de la seconde manœuvre d'usinage détectant automatiquement, au moins en partie, un changement d'une propriété de pièce indépendamment, en particulier, de la première manœuvre d'usinage et/ou un réglage de la première manœuvre d'usinage par rapport, en particulier, à une référence respectivement définie, et réalisant la position relative en fonction du changement détecté.
EP21746708.3A 2020-07-20 2021-07-20 Procédé d'usinage de dentures Pending EP4182113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020004346.1A DE102020004346A1 (de) 2020-07-20 2020-07-20 Verfahren zur Verzahnungsbearbeitung
PCT/EP2021/070216 WO2022018060A1 (fr) 2020-07-20 2021-07-20 Procédé d'usinage de dentures

Publications (1)

Publication Number Publication Date
EP4182113A1 true EP4182113A1 (fr) 2023-05-24

Family

ID=77104061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21746708.3A Pending EP4182113A1 (fr) 2020-07-20 2021-07-20 Procédé d'usinage de dentures

Country Status (7)

Country Link
US (1) US20230264281A1 (fr)
EP (1) EP4182113A1 (fr)
JP (1) JP2023535707A (fr)
KR (1) KR20230038455A (fr)
CN (1) CN115768579A (fr)
DE (1) DE102020004346A1 (fr)
WO (1) WO2022018060A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10331957A (ja) * 1997-05-30 1998-12-15 Toyota Central Res & Dev Lab Inc 歯車対および歯面形状設定方法
DE10330474B4 (de) 2003-07-05 2009-03-05 Fette Gmbh Vorrichtung zur Herstellung eines Zahnrads aus einem Zahnradrohling
EP2314405B1 (fr) * 2009-10-05 2012-12-26 Klingelnberg AG Procédé de production de roues coniques dotées d'une dentelure hypocycloïde dans le procédé de moulage en continu en utilisant des outils correspondants
DE102013012797A1 (de) 2013-07-31 2015-02-19 Gleason-Pfauter Maschinenfabrik Gmbh Verfahren zum Bearbeiten von Zahnkanten und dazu ausgelegte Bearbeitungsstation
EP2954967B1 (fr) 2014-06-11 2019-08-07 Klingelnberg AG Procédé et dispositif de chanfreinage frontal d'une denture d'une pièce à usiner
DE102014014132A1 (de) 2014-09-30 2016-05-25 Liebherr-Verzahntechnik Gmbh Verfahren und Vorrichtung zum Anfasen und Entgraten verzahnter Werkstücke
DE102015012603A1 (de) 2015-09-28 2017-03-30 Liebherr-Verzahntechnik Gmbh Verfahren zum Entgraten eines Zahnradrohlings
DE102017103115A1 (de) * 2017-02-16 2018-08-16 Klingelnberg Ag Verfahren zum Auslegen und Bearbeiten eines Zahnrads sowie entsprechende Bearbeitungsmaschine und Software
DE102018001477A1 (de) 2018-02-26 2019-08-29 Gleason-Pfauter Maschinenfabrik Gmbh Anfaswerkzeug und Verfahren zum Anfasen von Verzahnungen
CN209598821U (zh) * 2018-12-21 2019-11-08 中信重工机械股份有限公司 基于立式滚齿机的配对开式大小齿轮对滚啮合检测装置

Also Published As

Publication number Publication date
JP2023535707A (ja) 2023-08-21
KR20230038455A (ko) 2023-03-20
DE102020004346A1 (de) 2022-01-20
WO2022018060A1 (fr) 2022-01-27
CN115768579A (zh) 2023-03-07
US20230264281A1 (en) 2023-08-24

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