WO2013075773A2 - Machine à tailler les engrenages et procédé permettant de réaliser ou de travailler des dentures - Google Patents

Machine à tailler les engrenages et procédé permettant de réaliser ou de travailler des dentures Download PDF

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Publication number
WO2013075773A2
WO2013075773A2 PCT/EP2012/004348 EP2012004348W WO2013075773A2 WO 2013075773 A2 WO2013075773 A2 WO 2013075773A2 EP 2012004348 W EP2012004348 W EP 2012004348W WO 2013075773 A2 WO2013075773 A2 WO 2013075773A2
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WO
WIPO (PCT)
Prior art keywords
workpiece
processing station
spindle
main
iii
Prior art date
Application number
PCT/EP2012/004348
Other languages
German (de)
English (en)
Other versions
WO2013075773A3 (fr
Inventor
Hansjörg Geiser
Original Assignee
Liebherr-Verzahntechnik 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
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Application filed by Liebherr-Verzahntechnik Gmbh filed Critical Liebherr-Verzahntechnik Gmbh
Publication of WO2013075773A2 publication Critical patent/WO2013075773A2/fr
Publication of WO2013075773A3 publication Critical patent/WO2013075773A3/fr

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Classifications

    • 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
    • B23F23/02—Loading, unloading or chucking arrangements for workpieces
    • B23F23/04—Loading or unloading arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F17/00—Special methods or machines for making gear teeth, not covered by the preceding groups
    • B23F17/006—Special methods or machines for making gear teeth, not covered by the preceding groups using different machines or machining operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • B23Q7/02—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of drums or rotating tables or discs

Definitions

  • the invention relates to a gear cutting machine and a method for producing or processing gears.
  • Gear cutting machines are used inter alia in the manufacture of gears from metallic blanks and are known in the art.
  • industrial applications such as automotive engineering, where a large number of identical gears are to be mass-produced, a reduction in the total process time in the gearing and the corresponding post-processing is increasingly in the foreground.
  • DE 10 2009 048 012 A1 proposes a generic gear cutting machine which has two pivoting units each with a workpiece spindle.
  • the pivoting units are pivotable about two mutually parallel axes and arranged to each other such that the circular trajectories of the workpiece spindles intersect at two points, being located at an intersection of the main processing table and an intersection of the loading table.
  • different auxiliary processing points are present between the main processing table and the loading table.
  • DE 10 2006 044 738 B3 discloses a generic gear cutting machine with two workpiece spindles arranged on a single pivoting unit, wherein the pivoting unit can be rotated about an axis such that the workpiece spindles can be reciprocated alternately between a machining position and a transfer position.
  • the transfer position are also Anphaswerkmaschinee and cutting tools for the intermediate treatment of the workpieces, for each of which a two-time machining is provided at the machining position.
  • EP 1 146 983 B1 likewise describes a generic gear cutting machine with two workpiece spindles mounted on a single pivoting unit pivotable about a main axis. By rotation of the pivoting unit, the workpiece spindles are pivotable between a processing position and a transfer position.
  • the object of the invention is to provide a gear cutting machine and a method for producing or machining gears, wherein the manufacturing time of the workpieces is to be further shortened. It is further desirable if the machine is as compact as possible to minimize the footprint.
  • a gear cutting machine is provided with at least two and preferably exactly two workpiece spindles pivotable about a common main axis.
  • the workpiece spindles serve to receive the workpieces to be processed.
  • These are preferably rotatably mounted motor spindles, wherein the workpieces attached thereto are rotatable about the spindle axes.
  • the spindle axes are parallel to the main axis.
  • the main axis and / or the spindle axes can be vertical.
  • the workpiece spindles can be designed to be suspended or upright.
  • the machine has at least one and preferably exactly one main processing station, and has at least one auxiliary processing station.
  • the machine At the main processing station (the main processing table), the integration of the toothing or the profile into the workpiece (main processing) is provided.
  • the machine At the main processing station, the machine therefore has one or more devices or tools for incorporating the toothing or the profile into the workpiece.
  • Such devices include, for example, milling and grinding tools.
  • auxiliary processing stations the auxiliary processing tables
  • a pre-processing and / or intermediate processing and / or post-processing (summarized as secondary processing steps) of the workpieces is provided.
  • intermediate or subsequent measurements on the workpieces may be made or a quality inspection of the machined workpieces (test steps) may be provided.
  • the loading and / or unloading of the workpiece spindles with the workpieces (loading cycles) can also take place at the auxiliary processing stations.
  • the auxiliary processing steps are carried out as soon as a workpiece spindle with a workpiece received or clamped thereto is located at this position.
  • the machine may have at this position one or more further described in detail below, necessary for these processes devices or tools.
  • sub-processing steps and testing steps and loading cycles or at least sub-processing steps and loading cycles are feasible.
  • the workpiece spindles are arranged on a pivotable about a main axis pivot unit.
  • the machine is characterized in that the angle included by the spindle axes belonging to the workpiece spindles and the main axis is less than 180 ° (corresponds to the angle enclosed by the main machining position, a secondary machining position and the main axis).
  • the angle included by the spindle axes belonging to the workpiece spindles and the main axis is less than 180 ° (corresponds to the angle enclosed by the main machining position, a secondary machining position and the main axis).
  • the angle subtended by the spindle axes and the major axis is between about 20 ° and about 150 °, preferably the angle may be between about 30 ° and about 120 °. Within these limits, the exact choice of angle depends on the individual requirements of the machine. A smaller angle can shorten the time required for the pivoting and a more compact design of the machine (footprint) enable. A larger angle allows more space for the processing devices and may allow for a location of the auxiliary processing positions that are beneficial in a shop floor for performing the loading cycles.
  • the spindle axes of all workpiece spindles have an identical distance to the main axis.
  • the pivoting of the workpieces received on the workpiece spindles thus takes place along a circular trajectory whose radius corresponds to the distance of the spindle axes from the main axis.
  • all processing stations ie main and auxiliary processing stations
  • all workpiece spindles are fixedly arranged on the pivoting unit, which is mounted pivotably about the main axis.
  • the workpiece spindles are connected to the pivoting unit such that the positions (in the sense of at least one of the properties angle and / or distance) of the main axis and the spindle axes relative to one another can not be changed.
  • the possibility of lowering and raising the workpiece spindles along the spindle axis is not affected.
  • the pivoting of the workpiece spindles always takes place simultaneously by pivoting the common pivoting unit.
  • the machine has at least two and preferably exactly two auxiliary processing stations.
  • auxiliary processing stations By using two auxiliary processing stations at which all desired secondary processing steps and / or test steps and / or load cycles can be performed, a shortened overall process duration can be achieved. Because proportionally stands in the Overall process time the main processing in the foreground so that it makes sense to perform as many auxiliary processing steps and / or test steps on a second workpiece and carry out all charging cycles, while a first workpiece (main) is processed.
  • the number of auxiliary processing devices depends on their mounting position.
  • Each sub-processing station may have one, two or more sub-processing devices, depending on the existing installation conditions and on the requirements of the sub-processing process. An arrangement of one, two or more auxiliary processing devices away from the auxiliary processing station can also be provided.
  • the machine has a loading system which is suitable and intended to load the workpiece spindles of the machine with the workpieces to be processed and to remove the finished workpieces from the workpiece spindles.
  • the loading system is designed so that at both auxiliary processing stations of the machine both a load and a discharge can take place.
  • suitable devices for auxiliary machining of the workpieces include those for deburring and / or chamfering the edges produced in the manufacture of the gearing, such as, for example, pressure or Wälzentgrattechnikmaschinectione, finger milling and Spezialentgratfräsen (ChamferCut milling).
  • suitable devices for auxiliary machining of the workpieces comprise positioning devices and / or threading devices. These can be designed so that the positioning of the workpieces on the workpiece spindles (with respect to the rotation about the spindle axis) takes place in accordance with an indexing or an already integrated toothing.
  • suitable auxiliary processing devices include those for brushing the workpieces, those for partially cleaning the workpieces (eg by a spin process), those for turning and / or drilling the workpieces, those for honing or finishing the workpieces or their teeth, and those for hard turning of the workpieces.
  • suitable devices for inspecting the workpieces include gauges for measuring various parameters of the partially machined or finished workpieces, e.g. For measuring the profile of gears or for measuring the flank line. Examples include a ball gauge.
  • all subprocessing stations are equivalent. This is to mean that all sub-processing stations have the same devices for performing the same sub-processing steps and testing steps and loading cycles, so that the same processes can take place correspondingly at all sub-processing stations. This has the advantage that the process required for the respective workpiece located there can take place at each auxiliary processing station, which has a positive effect on the overall processing time.
  • the main processing stations and auxiliary processing stations are arranged along a circular path extending around the major axis (as the center).
  • each one of the workpiece spindles is pivotable between a main machining position and a sub machining position.
  • the word “main machining position” refers to the position of the workpiece spindle in which the workpiece received thereon is located at the main machining station
  • the word “minor machining position” refers to a position of the workpiece spindle in which it is located picked workpiece is located at a secondary processing station. It is preferably provided that each individual one of the workpiece spindles is pivotable between the main processing position and exactly one (respectively different) auxiliary processing position, wherein each auxiliary processing position can only be assumed by one of the workpiece spindles.
  • two pivot positions can be defined for the workpiece spindles and / or the pivot unit.
  • a first pivot position corresponds to the position of a first workpiece spindle at the main processing station and the position of a second workpiece spindle at a second secondary processing position.
  • a second pivotal position corresponds to the position of the first workpiece spindle at a first auxiliary machining position and the position of the second workpiece spindle at the main machining position. It can be provided that these two pivoting positions represent the only positions for which a motionless lingering of the workpiece spindles or the pivoting unit is provided during operation of the machine. For setting these pivoting positions, a mechanical stop, a latching device or the like may be provided in the machine.
  • the invention further relates to a method for producing or machining a toothing on workpieces on a machine according to the invention.
  • the method comprises the following steps:
  • a first workpiece is splined at a main processing station (main processing).
  • the first workpiece is received or clamped on a first workpiece spindle of the machine.
  • a second workpiece spindle is loaded at a second auxiliary processing station with a second workpiece. If necessary, the second workpiece is also simultaneously for the main machining of the first workpiece at the second auxiliary processing station.
  • a second step (ii) the positions of the first and second workpiece spindles are changed such that the first work piece (which has just been machined) is guided to a first auxiliary processing station and the second work piece (just loaded and possibly pre-machined) is guided to the main processing station.
  • a third step (iii) the second workpiece, which is located on the second workpiece spindle and after pivoting on the main processing station, is processed in the main.
  • the first workpiece located on the first workpiece spindle and after the pivoting at the first auxiliary processing station is reworked or interposed and / or tested.
  • this is also removed after the post-processing and successful testing at the same time as the main machining of the second workpiece from the first workpiece spindle.
  • the first, second and third steps are carried out in the order named.
  • the method according to the invention has the advantage of a high efficiency and a short total process time, since all auxiliary processing steps, test steps and loading cycles on one workpiece are done while the time-consuming main machining of another workpiece takes place.
  • a decrease of the second workpiece from the first workpiece spindle can be dispensed with, and the third step (iii) can be followed by several intermediate steps.
  • a first such intermediate step (iii-a) the positions of the first and second workpiece spindles are changed so that the first workpiece is fed back to the main processing station and the second workpiece is fed back to the second auxiliary processing station.
  • a second such intermediate step (iii-b) the main machining of the first workpiece is continued (or the toothing in the first workpiece is revised).
  • the second workpiece can be reworked or interposed and / or checked at the second secondary processing station.
  • a change in the position of the first and second workpiece spindle is identical to the change in the second step (ii).
  • step (iii-d) simultaneously with step (iii), the main machining of the second workpiece is continued, and at the same time the first workpiece is reworked at the first auxiliary processing station or interposed and / or tested, and if necessary removed.
  • a process guide integrating these intermediate steps may serve for on-line quality control and error correction.
  • step (iii) or intermediate step (iii-d) there was a quality control. If an error is detected in the machined workpieces, the respective workpiece can be guided directly to the main machining position and the error can be corrected immediately with little expenditure of time.
  • the integration of the intermediate steps thus depends on the result of a test of the first workpiece in step (iii).
  • a process guide may be provided integrating these intermediate steps regardless of the result of any testing of the first workpiece in step (iii) if two main machining cycles - step (i) and intermediate step (iii-b) - are desired on a workpiece.
  • the method comprises a fourth step (iv) in which, in addition to the main machining of the second workpiece located on the second workpiece spindle, a main processing station is loaded with a first workpiece at the first auxiliary processing position by a removal of the first workpiece ,
  • the third workpiece in this period can also be pre-processed at the first auxiliary processing station.
  • the fourth step (iv) is downstream of the third step (iii) or the intermediate steps.
  • the method further comprises a fifth step (v) wherein the position of the first and second workpiece spindles is changed identically to the change in intermediate step (iii-a).
  • step sequence (iii) to (v), including if appropriate the intermediate steps is repeated periodically-using new workpieces in each case-which corresponds to a continuous process management.
  • each positional change of the first and second workpiece spindles is accomplished by simultaneously moving the first and second workpiece spindles along a common circular trajectory, sweeping over an angle of less than 180 °. Preferably, an angle of between 20 ° and 150 °, and more preferably between 30 ° and 120 ° is swept over. In one embodiment, a milling and / or grinding is provided for the production or processing of the toothing in the context of the main machining.
  • a deburring and / or chamfering of the edges produced during the main processing is provided, in particular during the post-processing.
  • a threading of the workpieces on the workpiece spindles and / or a positioning of the workpieces by turning about the spindle axis suitable for indexing or already worked teeth done, especially in the context of pre-processing and / or intermediate processing.
  • brushing of the workpieces or their teeth, (parts) to clean the workpieces eg by a spin process
  • a turning and / or drilling of the workpieces e.g., a turning and / or drilling of the workpieces, honing or finishing the workpieces or their teeth, and a hard turning of the workpieces done, especially in the context of post-processing.
  • measuring various parameters of the partially machined or finished workpieces e.g. a profile measuring the teeth or measuring the flank line provided.
  • Figure 1 an embodiment of a machine according to the invention in
  • Figure 2 the machine shown in Figure 1 in a perspective view
  • Figure 3 shows a further embodiment of a machine according to the invention in a perspective view, wherein the pivoting unit is in a first position;
  • Figure 4 the machine shown in Figure 3, wherein the pivoting unit is in a second position;
  • FIG. 5 schematic diagrams of a further embodiment of a machine according to the invention in plan view and side view;
  • FIG. 6 Schematic diagrams of yet another embodiment of a machine according to the invention.
  • FIGS. 1 and 2 show a gear cutting machine 10 according to the invention.
  • the pivoting unit 60 has two extensions 90, 91 with located on the underside of workpiece spindles (not visible in the figures, hereinafter referred to according to the extensions with reference numerals 90, 91), with respect to a horizontal movement fixed and vertically raised and lowered at the Swivel unit 60 are arranged.
  • Each workpiece spindle is assigned a vertical spindle axis C1 or C2. Workpieces received on the workpiece spindles are rotatably mounted and positionable about these axes.
  • the workpiece spindles are motor spindles.
  • the included by the workpiece spindles 90, 91 and the main axis HA angle ⁇ is 120 °.
  • the machine has a main processing station HBS and two auxiliary processing stations NBS1 and NBS2.
  • a milling or grinding device 50 for producing a toothing or for machining a toothing.
  • This device 50 is adjustably mounted in all directions and their movement can be coordinated with a movement of the recorded on a workpiece spindle workpiece during processing.
  • the sub-processing stations NBS1 and NBS2 are equivalent, ie they have the same devices for performing various sub-processes.
  • the slave processing stations NBS1 and NBS2 include push deburring devices 70, 71 and pusher tools 80, 81.
  • a method for toothing or profiling can be carried out as follows:
  • the pivoting unit 60 is shown in a first pivotal position.
  • the second auxiliary processing station NBS1 by means of a loading device (not shown in FIGS. 1 and 2), a second workpiece can be picked up on the spindle 91 and optionally positioned and preprocessed.
  • the pivoting unit 60 After the toothing or machining of the first workpiece, the pivoting unit 60 is rotated around the main axis HA by 120 ° counterclockwise, so that the pivoting unit 60 is transferred to a second pivoting position (not shown in FIGS. 1 and 2).
  • the workpiece spindle 90 is at the first auxiliary machining position and the spindle 91 is in the main machining position, which corresponds to a position of the second workpiece attached to the spindle 91 at the main machining station HBS and the first workpiece attached to the spindle 90 at the slave machining station NBS1 ,
  • the toothing is now produced or machined on the second workpiece accommodated on the spindle 91 at the main processing station HBS with the aid of the milling or grinding device 50.
  • the first workpiece located on the spindle 90 is reworked.
  • this post-processing in particular a Deburring and chamfering using the Druckentgrat Skooth Sk 80 includes.
  • a test of the first workpiece by means of a (not shown) measuring device can be done at this position.
  • the pivoting device 60 is pivoted clockwise by 120 °, and the third workpiece is processed as before the first and second workpieces in the main processing station HBS, and the second workpiece, as previously the first workpiece in the first auxiliary processing station NBS, the second auxiliary processing station NBS2 checked and / or reworked and / or accepted.
  • the production of the toothing on the second workpiece located on the workpiece spindle 91 is interrupted and the second workpiece is transferred to the first auxiliary processing station NBS1, while the first workpiece located on the workpiece spindle 90 is swiveled back into the main processing station HBS for further processing.
  • Such a process can take place either when a repetitive profiling or toothing of a workpiece at the main processing station HBS is provided by the process, or if a fault or incomplete machining is detected on a workpiece (in this case attached to the spindle 90).
  • Such pivoting before removal can be carried out for both workpiece spindles 90, 91 and repeated as often as desired.
  • an online error correction and a very flexible process management can be realized.
  • Figures 3 and 4 show a further embodiment of a device according to the invention, which is very similar to the embodiment shown in Figures 1 and 2.
  • FIG. 3 shows the corresponding machine with the swivel device 60 in a first swivel position and FIG. 4 with the swivel device 60 in a second swivel position.
  • FIGs 5a and 5b show a further embodiment of a device according to the invention which is very similar to the embodiment shown in Figures 1 and 2.
  • the main difference can be seen in the angle between the main processing station HBS and the auxiliary processing station NBS1 and NBS2, which is 30 °.
  • a slave processing device 80 may be used at both slave processing stations.
  • the workpiece spindles 90 and 91 are designed standing.
  • the apparatus may further comprise a separate charging system suitable, for example, for loading and unloading both motor spindles at both auxiliary processing stations NBS1 and NBS2.
  • the charging device may have a control unit, and the loading / unloading process and an external Automation, such as the illustrated treadmill, can be tuned to integrate the machine into a multi-stage process.
  • FIG. 6a shows a schematic representation of a machine according to the invention. Corresponding components are identified by identical reference numerals to FIGS. 1 and 2.
  • two workpiece spindles 90 and 91 are mounted at an angle ⁇ of 60 ° to each other. These can be swiveled back and forth by rotation about 60 ° about the main axis HA between the main machining position and one secondary machining position.
  • a sub-processing station NBS1 or NBS2 each of which is schematically indicated by numbers 70, 71; 80, 81 tools shown for deburring and chamfering.
  • a main machining station HBS which has a milling head 55 for producing the toothing.
  • Both the devices of the auxiliary processing stations and the main processing station are pivotable in several directions, as indicated in the figure by the arrows.
  • FIGS. 6b and 6c show alternative embodiments of tools of the main processing station HBS, FIG. 6b shows a rolling impact head with cutting unit 56 and FIG. 6c shows a grinding worm 57 with profile grinding wheel 58.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Processing (AREA)

Abstract

L'invention concerne une machine à tailler les engrenages, qui comprend au moins deux broches porte-pièces destinées à recevoir les pièces à travailler, au moins un poste de travail principal permettant de former la denture ou le profil et au moins un poste de travail secondaire, les broches porte-pièces étant disposées sur une unité pivotante pouvant pivoter autour d'un axe principal. L'angle formé par les axes associés aux broches porte-pièces et l'axe principal est inférieur à 180°. L'invention porte également sur un procédé permettant de réaliser ou de travailler une denture sur des pièces.
PCT/EP2012/004348 2011-11-21 2012-10-17 Machine à tailler les engrenages et procédé permettant de réaliser ou de travailler des dentures WO2013075773A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011119000A DE102011119000A1 (de) 2011-11-21 2011-11-21 Verzahnmaschine und Verfahren zur Herstellung oder Bearbeitung von Verzahnungen
DE102011119000.0 2011-11-21

Publications (2)

Publication Number Publication Date
WO2013075773A2 true WO2013075773A2 (fr) 2013-05-30
WO2013075773A3 WO2013075773A3 (fr) 2013-07-25

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DE (1) DE102011119000A1 (fr)
WO (1) WO2013075773A2 (fr)

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JP2018527209A (ja) * 2015-09-17 2018-09-20 エマーク・ホールディング・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 歯部の製造及びバリ取りのための方法及び装置
US10765801B2 (en) 2014-12-19 2020-09-08 Amgen Inc. Drug delivery device with proximity sensor
US11213624B2 (en) 2014-06-03 2022-01-04 Amgen Inc. Controllable drug delivery system and method of use
US11357916B2 (en) 2014-12-19 2022-06-14 Amgen Inc. Drug delivery device with live button or user interface field

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DE102019101027A1 (de) 2019-01-16 2020-07-16 Klingelnberg Gmbh Vorrichtung und Verfahren zum Prüfen und/oder Messen von Zahnrädern

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DE102006044738B3 (de) 2006-09-20 2008-04-03 Felsomat Gmbh & Co. Kg Wälzentgraten mit integriertem Sekundärentgraten ohne Glättwerkzeug
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
US11213624B2 (en) 2014-06-03 2022-01-04 Amgen Inc. Controllable drug delivery system and method of use
US11738146B2 (en) 2014-06-03 2023-08-29 Amgen Inc. Drug delivery system and method of use
US11992659B2 (en) 2014-06-03 2024-05-28 Amgen Inc. Controllable drug delivery system and method of use
US10765801B2 (en) 2014-12-19 2020-09-08 Amgen Inc. Drug delivery device with proximity sensor
US10799630B2 (en) 2014-12-19 2020-10-13 Amgen Inc. Drug delivery device with proximity sensor
US11357916B2 (en) 2014-12-19 2022-06-14 Amgen Inc. Drug delivery device with live button or user interface field
US11944794B2 (en) 2014-12-19 2024-04-02 Amgen Inc. Drug delivery device with proximity sensor
JP2018527209A (ja) * 2015-09-17 2018-09-20 エマーク・ホールディング・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 歯部の製造及びバリ取りのための方法及び装置
JP6990173B2 (ja) 2015-09-17 2022-01-12 エマーク・ホールディング・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 歯部の製造及びバリ取りのための方法及び装置

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WO2013075773A3 (fr) 2013-07-25
DE102011119000A1 (de) 2013-05-23

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