EP1137505A1 - Method and device for grinding workpieces with centers which comprise form variations - Google Patents

Method and device for grinding workpieces with centers which comprise form variations

Info

Publication number
EP1137505A1
EP1137505A1 EP99963457A EP99963457A EP1137505A1 EP 1137505 A1 EP1137505 A1 EP 1137505A1 EP 99963457 A EP99963457 A EP 99963457A EP 99963457 A EP99963457 A EP 99963457A EP 1137505 A1 EP1137505 A1 EP 1137505A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
tip
tailstock
quill
center
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.)
Withdrawn
Application number
EP99963457A
Other languages
German (de)
French (fr)
Inventor
Erwin Junker
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.)
Erwin Junker Maschinenfabrik GmbH
Original Assignee
Erwin Junker 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 Erwin Junker Maschinenfabrik GmbH filed Critical Erwin Junker Maschinenfabrik GmbH
Publication of EP1137505A1 publication Critical patent/EP1137505A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B23/00—Tailstocks; Centres
    • 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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/065—Steady rests
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally

Definitions

  • the invention relates to a method and an apparatus for grinding workpieces with centers that deviate in shape.
  • the prior art includes fine machining, in particular grinding, of workpieces, which are received between the tips of a workpiece headstock and a tailstock.
  • fine machining in particular grinding
  • workpieces that have very thin walls in the area of the clamping center are particularly difficult.
  • Such workpieces are often not pre-machined to the exact shape or, due to a heat treatment applied after the pre-machining, have inaccuracies in shape such as roundness due to warpage.
  • the elimination of this distortion-related out-of-roundness of thin-walled workpieces can usually not be corrected by subsequent grinding on the outside diameter of the workpieces, i.e. the out-of-roundness of the center is transferred as an error in dimensions and roundness during external cylindrical grinding.
  • the tip of the tailstock which is mounted on the tailstock quill, with a pressure bolt, which is equipped with a spring element. is executed.
  • the workpiece to be machined is pressed axially against the opposite tip of the workpiece spindle of the workpiece spindle stick.
  • the workpiece is supported by a steady position.
  • the pressure pin consists of a piston part and a rod part; the pressure pin is mounted inside the base body of the tailstock tip.
  • the tailstock quill with tailstock tip can be retracted to an intermediate position.
  • the workpiece for machining in the centering area of the workpiece headstock and the jaws of the support steady rest are thus centered exactly.
  • FIG. 1 shows a partial top view of a grinding machine with a partial sectional view of the workpiece clamping.
  • FIG. 2 shows a further partial top view of the grinding machine according to FIG. 1 with a partial sectional view of the workpiece clamping in an operating position.
  • Fig. 3 shows a sectional view of the tailstock-side workpiece clamping with the tailstock tip in a contact position with the steady rest, but not shown.
  • Fig. 4 shows a sectional view of the tailstock-side workpiece clamping with pressure bolts in a retracted intermediate position of the tailstock quill with the tailstock tip.
  • FIG. 1 shows, for example, the clamping of a workpiece 5 on a grinding machine.
  • the workpiece 5 is clamped between the tip 4 of the workpiece spindle 30 of the workpiece headstock 1 and the tip 6 with the center 11 of the tailstock 3.
  • the clamping and unclamping of the workpiece between the tip 4 of the workpiece spindle 30 and the tip 6 of the quill 13 is made possible in that the tailstock quill 13 is retracted into a rear position by moving the tailstock.
  • the workpiece headstock 1 and the tailstock 3 are on a grinding table 2 which can be moved in the Z direction and is only partially shown. assembled.
  • the workpiece headstock 1 has a workpiece spindle 30. which is driven by a motor drive, not shown.
  • the tailstock 3 is equipped with a moving tailstock quill 13 which is axially displaceable within the housing of the tailstock 3.
  • the center axis of the workpiece spindle 30 of the workpiece headstock 1 and the quill 13 of the tailstock 3 are exactly aligned with one another. In between, the workpiece 5 is also clamped in alignment with its longitudinal axis.
  • a support bezel 7 with movable jaws 9 is arranged on the grinding table 2.
  • the grinding spindle 15 with the grinding wheel 16 is perpendicular to the workpiece in the direction of the X axis. clamping adjustable.
  • the grinding spindle 15 is arranged axially parallel to the Z axis of the machine tool.
  • the grinding wheel 16 is set at right angles to the workpiece in the direction of the X axis.
  • the workpiece is clamped between the tip 4 of the workpiece headstock 1 and the tip 6 of the tailstock 3. Since the workpiece 5 in the center 11, which rests on the tip 6 of the tailstock 3, is very thin-walled. a centering deformation of the thin-walled area of the workpiece 5 takes place as a result of the compressive forces applied during clamping; because the tailstock-side area of the receiving center of the workpiece 5 is pressed round by the axial pressure force emanating from the tip 6 of the tailstock 3 in connection with the frustoconical tip 6 of the tailstock 3.
  • a steady rest 8 is ground against which a support bezel 7 can be moved, with the grinding wheel 16 being arranged at right angles to the workpiece according to the X axis and parallel to the Z axis with the grinding wheel 16 being arranged on the grinding spindle 15 Baking 9 is started.
  • the workpiece 5 is reclamped and finished in order in this way to achieve an accurate, i.e. to obtain workpiece 5 freed from non-roundness.
  • FIG. 3 shows the embodiment for the frustoconical design of the tip 6, which is covered with a hard metal body 6A for reasons of wear.
  • the quill 13 of the tailstock 3 is shown, the tip 6 being arranged on a guide element 24 which is aligned with the longitudinal axis of the quill 13.
  • the guide element 24 has a central longitudinal bore which has bore sections which become smaller in diameter towards the end of the tip. At the opposite end of the guide element 24, the diameter water of the hole for receiving an adjustable screw 23 is the largest. The subsequent bore section has a smaller diameter.
  • a spring element 22 which is adapted to this diameter is arranged in this drilling section and bears on the one hand against the end face of an adjustable screw 23 and on the other hand against the end face of a cylindrical piston part 26 of a pressure pin 21 of the same diameter.
  • the other end of the cylindrical piston part 26 has an axially extending rod part 27 with a much smaller diameter.
  • the rod part 27 is guided through the outlet bore of the guide element 24.
  • the pressure bolt 21 preloaded with the spring element 22 exerts an axial force 32 on the workpiece 5.
  • Fig. 4 the sleeve 13 of the tailstock 3 is retracted to an intermediate position according to arrow position 10, so that the cone of the tip 6 of the tailstock 3 is no longer in pressure contact with the workpiece 5, according to position 1 1A.
  • the push rod 21 presses but with the spring force of the spring element 22, the workpiece 5 against the tip 4 of the workpiece spindle 30 of the workpiece headstock 1.
  • the support bezel 7 ensures the radial alignment of the workpiece 5 with respect to the tip 4 of the workpiece spindle 30 and the tip 6 of the quill 13.
  • the tip 6 of the tailstock 3 can thus be retracted to an intermediate position 10 without the centering achieved during clamping To affect workpiece 5. In any case, this path must be so great that the workpiece 5 no longer contacts the tip 6 of the sleeve 13, so that the workpiece 5 receives a contact-free center 11A. It is therefore sufficient if the travel distance to this intermediate position is only a few tenths of a millimeter.
  • the workpiece 5 Since the torque of the rotary movement of the workpiece 5 is transmitted through the tip 4 of the workpiece headstock 1, the workpiece 5 must be pressed against the tip 4 of the workpiece spindle 30 by a force 32. This frictional connection is provided by the pressure pin 21 via the rod part 27. In this way, the workpiece 5 is rotatably driven and held in the centered position by the support lugs 7, so that complete machining of the workpiece 5 on the outer circumference is made possible. In this way, the outer circumference of the tailstock end of the workpiece 5 can also be machined without inaccuracies, ie out-of-roundness, being transmitted to the workpiece 5.
  • At least one machining step on another machine tool with a different clamping system can be saved, whereby the machining costs can be reduced.
  • the method according to the invention and the device developed for this purpose are in no way limited to the grinding of workpieces; rather, other finishing operations can also be carried out afterwards.

Abstract

The invention relates to a method for machining workpieces with areas which comprise form variations, whereby the workpiece (5) is fixed between the tip (13) of the tool spindle (30) of the workpiece spindle head (1) and the tip (6) of the sleeve (13) of the tailstock (3), and a backrest seat (8) is ground on the workpiece (5). The tip (6) of the sleeve (13) of the tailstock (3) sits closely in the center of the receiver of the workpiece. The method is characterized in that the tip and the tailstock sleeve are retracted from the contact area, said contact area being located in the center of the clamping of the workpiece, to an intermediate position after the backrest seat has been ground. In addition, the workpiece is positionally fixed on the side of the tailstock by a backrest (7) and by an axial force which is applied via a prestressed pressure pin (21) and which is directed against the center of the clamping of the workpiece.

Description

Verfahren und Vorrichtung zum Schleifen von Werkstücken mit Zentren, die Formabweichungen aufweisenMethod and device for grinding workpieces with centers that have shape deviations
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Schleifen von Werkstücken mit Zentren, die Formabweichungen aurweisen.The invention relates to a method and an apparatus for grinding workpieces with centers that deviate in shape.
Zum Stand der Technik gehört die Feinbearbeitung, insbesondere die Schleifbearbeitung, von Werkstücken, wobei diese zwischen den Spitzen eines Werkstück- Spindelstocks und eines Reitstocks aufgenommen werden. Bei dieser Aufspan- nung bereiten vor allem solche Werkstücke Schwierigkeiten, die im Bereich des Aufspannzentrums sehr dünnwandig sind. Solche Werkstücke sind häufig nicht formgenau vorbearbeitet oder weisen aufgrund einer nach der Vorbearbeitung angewandten Wärmebehandlung verzugsbedingte Formungenauigkeiten wie Rundheitsfehler auf. Die Beseitigung dieser verzugsbedingten Unrundheiten von dünnwandigen Werkstücken ist meist durch eine anschließende Schleifbearbeitung am Außendurchmesser der Werkstücke nicht zu korrigieren, d.h., die Unrundheiten des Zentrums werden beim Außenrundschleifen als Maß- und Rundheitsfehler übertragen.The prior art includes fine machining, in particular grinding, of workpieces, which are received between the tips of a workpiece headstock and a tailstock. With this clamping, workpieces that have very thin walls in the area of the clamping center are particularly difficult. Such workpieces are often not pre-machined to the exact shape or, due to a heat treatment applied after the pre-machining, have inaccuracies in shape such as roundness due to warpage. The elimination of this distortion-related out-of-roundness of thin-walled workpieces can usually not be corrected by subsequent grinding on the outside diameter of the workpieces, i.e. the out-of-roundness of the center is transferred as an error in dimensions and roundness during external cylindrical grinding.
Es ist daher Aufgabe der Erfindung, ein Verfahren und eine Vorrichtung zu schaffen, mit der Formungenauigkeiten. wie Rundheitsabweichungen, des Zentrierbereichs des Werkstücks während der maschinellen Bearbeitung nicht auf das Fertigteil übertragen werden. Auf diese Weise soll der aufwendige Arbeitsgang des Zentrumschleifens vor dem Fertigschleifen des Werkstücks entfallen. Ferner soll eine hohe Fertigungsqualität erreicht werden, indem das Werkstück einen fehler- freien Außenumfang aufweist. In einer einzigen Aufspannung soll die komplette Außenkontur perfekt geschliffen werden.It is therefore an object of the invention to provide a method and a device with which inaccuracies in shape. such as roundness deviations, the centering area of the workpiece are not transferred to the finished part during machining. In this way, the complex operation of center grinding before finishing the workpiece is to be omitted. Furthermore, high manufacturing quality is to be achieved by the workpiece being has free outer circumference. The entire outer contour should be perfectly ground in a single setup.
Die Lösung dieser Aufgabe erfolgt mit den Merkmalen des auf das Verfahren gerichteten Patentanspruches 1 und des auf die Vorrichtung zur Durchführung des Verfahrens gerichteten Patentanspruches 2. Die Merkmale des Patentanspruches 3 gestalten die Vorrichtung nach Patentanspruch 2 konstruktiv weiter aus.This object is achieved with the features of patent claim 1 directed to the method and patent claim 2 directed to the device for carrying out the method. The features of patent claim 3 further design the device according to patent claim 2.
Diese Aufgabe wird dadurch gelöst, daß die Spitze des Reitstockes, die auf der Reitstockpinole montiert ist, mit einem Druckbolzen, der mit einem Federelement ausgestattet ist. ausgeführt ist. Damit wird das zu bearbeitende Werkstück axial gegen die gegenüberliegende Spitze der Werkstückspindel des Werkstückspindel - Stockes gedrückt. Das Werkstück wird dabei von einer Lünette lagefixierend abgestützt. Nach einer Ausführungsform der Erfindung besteht der Druckbolzen aus einem Kolbenteil und einem Stangenteil; der Druckbolzen ist im Innern des Grundkörpers der Reitstockspitze gelagert. Die Reitstockpinole mit Reitstockspitze kann auf eine Zwischenposition zurückgezogen werden. Damit ist das Werkstück zum Bearbeiten im werkstückspindelstockseiten Zentrierbereich und den Backen der Abstützlünette exakt zentriert aufgenommen.This object is achieved in that the tip of the tailstock, which is mounted on the tailstock quill, with a pressure bolt, which is equipped with a spring element. is executed. The workpiece to be machined is pressed axially against the opposite tip of the workpiece spindle of the workpiece spindle stick. The workpiece is supported by a steady position. According to one embodiment of the invention, the pressure pin consists of a piston part and a rod part; the pressure pin is mounted inside the base body of the tailstock tip. The tailstock quill with tailstock tip can be retracted to an intermediate position. The workpiece for machining in the centering area of the workpiece headstock and the jaws of the support steady rest are thus centered exactly.
Die Erfindung wird verfahrenstechnisch und vorrichtungsmäßig in den Zeichnungen gemäß den Fig. 1 bis 4 näher erläutert.The invention is explained in more detail in terms of process technology and device in the drawings according to FIGS. 1 to 4.
Fig. 1 zeigt eine Teildraufsicht einer Schleifmaschine mit Teilschnittdarstellung der W'erkstückeinspannung.1 shows a partial top view of a grinding machine with a partial sectional view of the workpiece clamping.
Fig. 2 zeigt eine weitere Teildraufsicht der Schleifmaschine nach Fig. 1 mit Teilschnittdarstellung der Werkstückeinspannung in einer Betriebsposition. Fig. 3 zeigt in Schnittdarstellung die reitstockseitige Werkstückeinspannung mit der Reitstockspitze in einer Kontaktposition bei angestellter, jedoch nicht dargestellter Lünette.FIG. 2 shows a further partial top view of the grinding machine according to FIG. 1 with a partial sectional view of the workpiece clamping in an operating position. Fig. 3 shows a sectional view of the tailstock-side workpiece clamping with the tailstock tip in a contact position with the steady rest, but not shown.
Fig. 4 zeigt in Schnittdarstellung die reitstockseitige Werkstückeinspannung mit Druckbolzen in einer zurückgezogenen Zwischenposition der Reitstockpinole mit der Reitstockspitze.Fig. 4 shows a sectional view of the tailstock-side workpiece clamping with pressure bolts in a retracted intermediate position of the tailstock quill with the tailstock tip.
In Fig. 1 ist beispielsweise die Aufspannung eines Werkstückes 5 auf einer Schleifmaschine dargestellt. Das Werkstück 5 ist zwischen der Spitze 4 der Werkstückspindel 30 des Werkstückspindelstocks 1 und der Spitze 6 mit dem Zentrum 1 1 des Reitstockes 3 eingespannt. Das Auf- und Ausspannen des Werkstückes zwischen der Spitze 4 der Werkstückspindel 30 und der Spitze 6 der Pinole 13 wird dadurch ermöglicht, daß durch Verfahren des Reitstockes die Reitstockpinole 13 in eine hintere Position zurückgezogen wird.1 shows, for example, the clamping of a workpiece 5 on a grinding machine. The workpiece 5 is clamped between the tip 4 of the workpiece spindle 30 of the workpiece headstock 1 and the tip 6 with the center 11 of the tailstock 3. The clamping and unclamping of the workpiece between the tip 4 of the workpiece spindle 30 and the tip 6 of the quill 13 is made possible in that the tailstock quill 13 is retracted into a rear position by moving the tailstock.
Der Werkstückspindelstock 1 und der Reitstock 3 sind auf einem in Z-Richtung verfahrbaren Schleiftisch 2, der nur teilweise dargestellt ist. montiert. Der Werk- stückspindelstock 1 weist eine Werkstückspindel 30 auf. die über einen nicht dargestellten Motorantrieb angetrieben ist. Der Reitstock 3 ist mit einer mitlaufenden Reitstockpinole 13 ausgestattet, die innerhalb des Gehäuses des Reitstockes 3 axial verschiebbar ist. Die Mittelsachse der Werkstückspindel 30 des Werkstückspindelstockes 1 und der Pinole 13 des Reitstockes 3 sind exakt fluchtend zuein- ander ausgerichtet. Dazwischen wird das Werkstück 5. mit seiner Längsachse ebenfalls fluchtend, eingespannt. Auf dem Schleiftisch 2 ist eine Abstützlünette 7 mit verfahrbaren Backen 9 angeordnet. Achsparallel zu der Anordnung von Werkstückspindelstock 1 und Reitstock 3 der Werkzeugmaschine ist die Schleifspindel 15 mit der Schleifscheibe 16 in Richtung der X-Achse senkrecht zur Werkstück- einspannung anstellbar angeordnet. Außerdem ist die Schleifspindel 15 achsparallel zu der Z-Achse der Werkzeugmaschine angeordnet. Die Anstellung der Schleifscheibe 16 in Richtung der X-Achse erfolgt rechtwinkelig zum Werkstück.The workpiece headstock 1 and the tailstock 3 are on a grinding table 2 which can be moved in the Z direction and is only partially shown. assembled. The workpiece headstock 1 has a workpiece spindle 30. which is driven by a motor drive, not shown. The tailstock 3 is equipped with a moving tailstock quill 13 which is axially displaceable within the housing of the tailstock 3. The center axis of the workpiece spindle 30 of the workpiece headstock 1 and the quill 13 of the tailstock 3 are exactly aligned with one another. In between, the workpiece 5 is also clamped in alignment with its longitudinal axis. A support bezel 7 with movable jaws 9 is arranged on the grinding table 2. Axially parallel to the arrangement of workpiece headstock 1 and tailstock 3 of the machine tool, the grinding spindle 15 with the grinding wheel 16 is perpendicular to the workpiece in the direction of the X axis. clamping adjustable. In addition, the grinding spindle 15 is arranged axially parallel to the Z axis of the machine tool. The grinding wheel 16 is set at right angles to the workpiece in the direction of the X axis.
Nach Fig. 2 ist das Werkstück zwischen der Spitze 4 des Werkstückspindelstockes 1 und der Spitze 6 des Reitstockes 3 eingespannt. Da das Werkstück 5 im Zentrum 1 1 , das an der Spitze 6 des Reitstockes 3 anliegt, sehr dünnwandig ist. findet infolge der beim Aufspannen aufgebrachten Druckkräfte eine zentrierende Ver- formung des dünnwandigen Bereiches des Werkstückes 5 statt; denn der reitstockseitige Bereich des Aufnahmezentrums des Werkstückes 5 wird durch die von der Spitze 6 des Reitstockes 3 ausgehende axiale Druckkraft in Verbindung mit der kegelstumpfförmigen Spitze 6 des Reitstockes 3 rundgedrückt.2, the workpiece is clamped between the tip 4 of the workpiece headstock 1 and the tip 6 of the tailstock 3. Since the workpiece 5 in the center 11, which rests on the tip 6 of the tailstock 3, is very thin-walled. a centering deformation of the thin-walled area of the workpiece 5 takes place as a result of the compressive forces applied during clamping; because the tailstock-side area of the receiving center of the workpiece 5 is pressed round by the axial pressure force emanating from the tip 6 of the tailstock 3 in connection with the frustoconical tip 6 of the tailstock 3.
Im mittleren Bereich des Werkstückes 5 wird mit der rechtwinkelig zum Werkstück gemäß der X-Achse anstellbaren und achsparallel zu der Z-Achse mit der Schleifscheibe 16. die auf der Schleifspindel 15 angeordnet ist, ein Lünettensitz 8 geschliffen, gegen den eine Abstützlünette 7 mit verfahrbaren Backen 9 angestellt wird. Daraufhin wird das Werkstück 5 umgespannt und fertig bearbeitet, um auf diese Weise ein formgenaues, d.h. von Unrundheiten befreites Werkstück 5 zu erhalten.In the central area of the workpiece 5, a steady rest 8 is ground against which a support bezel 7 can be moved, with the grinding wheel 16 being arranged at right angles to the workpiece according to the X axis and parallel to the Z axis with the grinding wheel 16 being arranged on the grinding spindle 15 Baking 9 is started. Thereupon, the workpiece 5 is reclamped and finished in order in this way to achieve an accurate, i.e. to obtain workpiece 5 freed from non-roundness.
In Fig. 3 ist die Ausführungsform für die kegelstumpfförmige Gestaltung der Spitze 6 , die aus Verschleißgründen mit einem Hartmetallkörper 6A besetzt ist. der Pinole 13 des Reitstockes 3 dargestellt, wobei die Spitze 6 auf einem Führungselement 24 angeordnet ist, das mit der Längsachse der Pinole 13 fluchtet. Das Führungselement 24 weist eine zentrische Längsbohrung auf, die zum Ende der Spitze hin abgestuft im Durchmesser kleiner werdende Bohrungsabschnitte besitzt. Am entgegengesetzten Ende des Führungselementes 24 ist der Durchmes- ser der Bohrung zur Aufnahme einer verstellbaren Schraube 23 am größten ausgeführt. Der darauf folgende Bohrungsabschnitt weist einen kleineren Durchmesser auf. In diesem Bohrabschnitt ist ein diesem Durchmesser angepaßtes Federelement 22 angeordnet, das einerseits gegen die Stirnfläche einer verstellbaren Schraube 23 und andererseits gegen die Stirnfläche eines zylindrischen Kolbenteils 26 eines Druckbolzens 21 mit gleichem Durchmesser anliegt. Das andere Ende des zylindrischen Kolbenteils 26 weist ein axial verlaufendes Stangenteil 27 mit wesentlich kleinerem Durchmesser auf. Das Stangenteil 27 ist durch die Austrittsbohrung des Führungselements 24 gefuhrt. Der mit dem Federelement 22 vorgespannte Druckbolzen 21 bringt eine Axialkraft 32 auf das Werkstück 5 auf.3 shows the embodiment for the frustoconical design of the tip 6, which is covered with a hard metal body 6A for reasons of wear. The quill 13 of the tailstock 3 is shown, the tip 6 being arranged on a guide element 24 which is aligned with the longitudinal axis of the quill 13. The guide element 24 has a central longitudinal bore which has bore sections which become smaller in diameter towards the end of the tip. At the opposite end of the guide element 24, the diameter water of the hole for receiving an adjustable screw 23 is the largest. The subsequent bore section has a smaller diameter. A spring element 22 which is adapted to this diameter is arranged in this drilling section and bears on the one hand against the end face of an adjustable screw 23 and on the other hand against the end face of a cylindrical piston part 26 of a pressure pin 21 of the same diameter. The other end of the cylindrical piston part 26 has an axially extending rod part 27 with a much smaller diameter. The rod part 27 is guided through the outlet bore of the guide element 24. The pressure bolt 21 preloaded with the spring element 22 exerts an axial force 32 on the workpiece 5.
In Fig. 4 ist die Pinole 13 des Reitstockes 3 auf eine Zwischenposition gemäß Pfeilposition 10 zurückgezogen, so daß der Konus der Spitze 6 des Reitstockes 3 nicht mehr in Druckkontakt mit dem Werkstück 5 steht, gemäß Position 1 1 A.. Die Druckbolzenstange 21 drückt aber mit der Federkraft des Federelements 22 das Werkstück 5 gegen die Spitze 4 der Werkstückspindel 30 des Werkstückspindelstocks 1.In Fig. 4, the sleeve 13 of the tailstock 3 is retracted to an intermediate position according to arrow position 10, so that the cone of the tip 6 of the tailstock 3 is no longer in pressure contact with the workpiece 5, according to position 1 1A. The push rod 21 presses but with the spring force of the spring element 22, the workpiece 5 against the tip 4 of the workpiece spindle 30 of the workpiece headstock 1.
Die Abstützlünette 7 gewährleistet die radiale Ausrichtung des Werkstückes 5 in Bezug auf die Spitze 4 der Werkstückspindel 30 und der Spitze 6 der Pinole 13. Die Spitze 6 des Reitstockes 3 kann folglich auf eine Zwischenposition 10 zurückgezogen werden, ohne die bei der Einspannung erzielte Zentrierung des Werkstückes 5 zu beeinträchtigen. Dieser Weg muß jedenfalls so groß sein, daß das Werkstück 5 nicht mehr die Spitze 6 der Pinole 13 kontaktiert, so daß das Werkstück 5 ein kontaktfreies Zentrum 11A erhält. Deshalb reicht es bereits aus, wenn der Verfahrweg nur wenige Zehntel Millimeter auf diese Zwischenposition 10 beträgt. Da das Drehmoment der Drehbewegung des Werkstückes 5 durch die Spitze 4 des Werkstückspindelstockes 1 übertragen wird, muß das Werkstück 5 durch eine Kraft 32 gegen die Spitze 4 der Werkstückspindel 30 gedrückt werden. Diesen Kraftschluß besorgt der Druckbolzen 21 über das Stangenteil 27. Auf die- se Weise wird das Werkstück 5 rotorisch angetrieben und durch die Abstützlü- nette 7 in der zentrierten Lage gehalten, so daß eine komplette Bearbeitung des Werkstückes 5 am Außenumfang ermöglicht wird. Auf diese Weise kann auch der Außenumfang des reitstockseitigen Endes des Werkstückes 5 bearbeitet werden, ohne daß Ungenauigkeiten, d.h. Unrundheiten, auf das Werkstück 5 übertragen werden.The support bezel 7 ensures the radial alignment of the workpiece 5 with respect to the tip 4 of the workpiece spindle 30 and the tip 6 of the quill 13. The tip 6 of the tailstock 3 can thus be retracted to an intermediate position 10 without the centering achieved during clamping To affect workpiece 5. In any case, this path must be so great that the workpiece 5 no longer contacts the tip 6 of the sleeve 13, so that the workpiece 5 receives a contact-free center 11A. It is therefore sufficient if the travel distance to this intermediate position is only a few tenths of a millimeter. Since the torque of the rotary movement of the workpiece 5 is transmitted through the tip 4 of the workpiece headstock 1, the workpiece 5 must be pressed against the tip 4 of the workpiece spindle 30 by a force 32. This frictional connection is provided by the pressure pin 21 via the rod part 27. In this way, the workpiece 5 is rotatably driven and held in the centered position by the support lugs 7, so that complete machining of the workpiece 5 on the outer circumference is made possible. In this way, the outer circumference of the tailstock end of the workpiece 5 can also be machined without inaccuracies, ie out-of-roundness, being transmitted to the workpiece 5.
Mit dem erfindungsgemäßen Verfahren und der Vorrichtung zur Durchfuhrung des Verfahrens kann mindestens ein Bearbeitungsgang auf einer anderen Werk- zeugmaschine mit einem anderen Einspannsystem eingespart werden, wodurch die Bearbeitungskosten verringert werden können. Das erfmdungsgemäße Verfahren und die hierfür entwickelte Vorrichtung sind keinesfalls auf das Schleifen von Werkstücken beschränkt, vielmehr können danach auch andere Feinbearbeitungen durchgeführt werden. With the method according to the invention and the device for carrying out the method, at least one machining step on another machine tool with a different clamping system can be saved, whereby the machining costs can be reduced. The method according to the invention and the device developed for this purpose are in no way limited to the grinding of workpieces; rather, other finishing operations can also be carried out afterwards.

Claims

Patentansprüche claims
1. Verfahren zum Bearbeiten von Werkstücken mit Bereichen, die Formabweichungen aufweisen, wobei das Werkstück zwischen der Spitze der Werkstückspindel des Werkstückspindelstockes und der Spitze der Pinole des Reitstockes eingespannt wird, und auf dem Werkstück ein Lünettensitz geschliffen wird, wobei die Spitze der Pinole des Reitstockes im Zentrum der Aufnahme des Werkstückes an- liegt.1. Method for machining workpieces with areas that have shape deviations, the workpiece being clamped between the tip of the workpiece spindle of the workpiece headstock and the tip of the quill of the tailstock, and a steady rest is ground on the workpiece, the tip of the quill of the tailstock is in the center of the workpiece holder.
dadurch gekennzeichnet, daß nach dem Schleifen des Lünettensitzes die Spitze und die Reitstockpinole aus dem Kontaktbereich im Zentrum der Aufspannung des Werkstückes auf eine Zwischenposition zurückgezogen werden, und das Werkstück reitstockseitig mit einer Lünette und einer gegen das Zentrum der Aufspannung des Werkstückes gerichteten, über einen vorgespannten Druckbolzen aufgebrachten Axialkraft lagefixiert wird.characterized in that after grinding the steady rest the tip and tailstock quill are withdrawn from the contact area in the center of the clamping of the workpiece to an intermediate position, and the workpiece on the tailstock side with a steady rest and one directed towards the center of the clamping of the workpiece via a pretensioned one Thrust bolt applied axial force is fixed in position.
Vorrichtung zur Bearbeitung von Werkstücken mit Zentren, die Formabweichungen aufweisen, wobei ein Werkstückspindelstock (1 ) mit Werkstückspindel (30) und mit einer auf der Längsachse der Werkstückspindel (30) angeordneten Spitze (4) zur Aufnahme des Werkstückes (5) ausge- stattet ist. und ein Reitstock (3) mit Pinole (13), die eine auf der Längsachse der Pinole (13) liegende Spitze aufweist, auf einem Schleiftisch vorgesehen sind,Device for machining workpieces with centers that have shape deviations, a workpiece headstock (1) with workpiece spindle (30) and with a tip (4) arranged on the longitudinal axis of the workpiece spindle (30) for receiving the workpiece (5). is equipped. and a tailstock (3) with quill (13), which has a tip lying on the longitudinal axis of the quill (13), is provided on a grinding table,
dadurch gekennzeichnet, daß in der Spitze (6) der Pinole (13) des Reitstockes (3) ein in der Längsachsecharacterized in that in the tip (6) of the quill (13) of the tailstock (3) one in the longitudinal axis
(31) der Pinole (13) geführter, mit einem Federelement (22) beaufschlagter Druckbolzen (21) angeordnet ist.(31) of the quill (13) guided with a spring element (22) pressurized bolt (21) is arranged.
Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Druckbolzen (21) aus einem Kolbenteil (26) und einem Stangenteil (27) mit kleinem Durchmesser besteht, der Druckbolzen (21) mit einem Federelement, insbesondere mit einer Schraubenfeder oder einem Tellerfederpaket, kopfseitig beaufschlagt ist, und das Federelement (22) mit einer Schraube (23) zur Druckeinstellung in Verbindung steht. Apparatus according to claim 2, characterized in that the pressure pin (21) consists of a piston part (26) and a rod part (27) with a small diameter, the pressure pin (21) with a spring element, in particular with a coil spring or a plate spring assembly, acts on the head side and the spring element (22) is connected to a screw (23) for adjusting the pressure.
EP99963457A 1998-12-11 1999-12-09 Method and device for grinding workpieces with centers which comprise form variations Withdrawn EP1137505A1 (en)

Applications Claiming Priority (3)

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DE19857359A DE19857359B4 (en) 1998-12-11 1998-12-11 Method and device for machining workpieces with thin-walled areas having centric deviations in shape
DE19857359 1998-12-11
PCT/EP1999/009702 WO2000035617A1 (en) 1998-12-11 1999-12-09 Method and device for grinding workpieces with centers which comprise form variations

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JP (1) JP2002532263A (en)
KR (1) KR20010093805A (en)
CN (1) CN1329528A (en)
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BR (1) BR9916125A (en)
CA (1) CA2352426A1 (en)
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WO (1) WO2000035617A1 (en)

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BR9916125A (en) 2001-09-04
CA2352426A1 (en) 2000-06-22
CN1329528A (en) 2002-01-02
JP2002532263A (en) 2002-10-02
CZ296983B6 (en) 2006-08-16
RU2001118829A (en) 2003-05-27
KR20010093805A (en) 2001-10-29
WO2000035617A1 (en) 2000-06-22
AU1974700A (en) 2000-07-03
DE19857359B4 (en) 2005-09-15
DE19857359A1 (en) 2000-06-21

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