EP0274497B1 - Process and device for grinding moulding blanks to size - Google Patents

Process and device for grinding moulding blanks to size Download PDF

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Publication number
EP0274497B1
EP0274497B1 EP87904379A EP87904379A EP0274497B1 EP 0274497 B1 EP0274497 B1 EP 0274497B1 EP 87904379 A EP87904379 A EP 87904379A EP 87904379 A EP87904379 A EP 87904379A EP 0274497 B1 EP0274497 B1 EP 0274497B1
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EP
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Prior art keywords
tip
grinding
blank
ground
moulding blank
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EP87904379A
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German (de)
French (fr)
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EP0274497A1 (en
Inventor
Werner WÄLTI
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Tschudin Werkzeugmaschinenfabrik
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Tschudin Werkzeugmaschinenfabrik
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Priority to AT87904379T priority Critical patent/ATE62168T1/en
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    • 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
    • B24B5/01—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor for combined grinding of surfaces of revolution and of adjacent plane surfaces on work
    • 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

Definitions

  • the present invention relates to a device according to the preamble of claim 1, by means of which pre-ground molded blanks can be ground to size.
  • This grinding of the pre-ground molded parts to size if only one end of the molded part has to be ground to size and a high degree of dimensional accuracy, in particular the cylindricity or taper of another area of the molded part is required, must be grinding between tips, which can be done in two or more successive grinding operations with intermediate reclamping of the molded parts on the grinding machine.
  • the present invention is based on the object of proposing a device by means of which the disadvantages of conventional pre-ground molded blanks can be overcome and cost-effective, high-precision, axially symmetrical profiled molded parts can be ground to size in a single grinding process between tips, even if an end region of the molded blanks must also be sanded.
  • this object is achieved by a device according to claim 1.
  • this representative molded part chosen for the illustration of the present invention is an extraordinarily demanding part, which is extremely difficult to produce in the conventional methods and with the conventional means, and its series production by means of the conventional method of decolletizing and gradual grinding of the different diameters and angles is very expensive.
  • this sophisticated part is very well suited to demonstrate the advantages and possibilities of the present invention compared to the conventional manufacturing processes for such parts.
  • a nozzle needle blank starts out by means of a Vietnamese ground operation an unhardened steel rod is unscrewed, whereupon this blank is hardened and pre-ground as part of a centerless grinding process before the guide diameter 3 and then the seat angle 11 and then the clearance angle 12 of the tip 10 are ground in individual grinding operations with different clamping of the molding blank 18.
  • a grinding process as described hereinafter with reference to FIG. 2, can advantageously be used instead of the decolletizing and centerless grinding.
  • a rod 13 of round material advantageously unhardened or hardened steel
  • the first collet 14 opposite a second collet 16 is arranged on the same axis B in a synchronous tool headstock 17 into which the rod 13, respectively.
  • a pre-machined molding blank 18 still connected to the rod 13 is inserted up to an adjustable and adjustable stop 19.
  • the two tool headstocks are advantageously components of an NC-controlled machine that enables automatic control of all work processes and operations.
  • a profile grinding wheel 20 and a support bezel 21 can also be seen in FIG. 2. It is also noticeable that the axis B is opposite that illustrated by the double arrow C. Feed axis of the profile grinding wheel 20 is not at a right angle, but is inclined to it. An inclination of approx. 10 ° has proven itself and makes it possible to grind the part end 1 'coming perpendicular to the longitudinal axis A of the molded part 1' and the needle lifting support 5 and the release transition 6 in a single grinding operation correctly at right angles to said longitudinal axis A of the molded part.
  • the profile grinding wheel 20 is designed such that it pre-grinds part of a first molded part blank 18 'at the same time and finely grinds at least some or all of the molded part blank 18' in one work step and separates it from the fully pre-machined molded part 18 lying partially in the second collet 16.
  • the support bezel 21 is arranged accordingly.
  • the second collet 16 in the synchronous tool headstock 17 is advantageously opened and retracted in such a way that the molding blank 18 which is partially inserted into it and is now separated from the rod 13 is pushed out of it by means of the stop 19 can be before the rod 13 is pushed so far until the molded part blank 18 'still connected to it in the place of the molded part blank 18 is inserted into the second collet 16 becomes. Then, possibly after a previous removal of the profile grinding wheel 20, again the grinding process described above takes place, in which a part of a new molding blank 18 'is pre-ground and a part or the whole of the molding blank 18' is ground to the point of separation from the rod 13. In this work step it may be appropriate to monitor a critical part diameter during the grinding process by means of a diameter measuring head 22 such that the profile disk feed can be controlled as a function of this part dimension.
  • the molded part blanks 18 produced according to the above grinding operation provided they have been ground out of hardened rods 13, are finished and at least have the dimensional accuracy and surface quality of centerless ground parts. They can therefore be fed directly to grinding to size without further preprocessing.
  • this type of production of the molded part blanks eliminates the need for centerless grinding of the blanks before grinding to size in the device according to the invention according to FIG. 3.
  • FIG. 3 the molded part blank receptacle and a fine grinding profile grinding wheel 29 shows by means of which the molded part blank 18 is finished to produce the finished, highly precise nozzle needle milled with the inner bore of the nozzle needle housing (not shown). Thanks to the method and the device according to the invention, the machining of the nozzle needle can, as mentioned, be carried out in a single clamping of the molding blank 18 between tips. Since this molding blank 18 only at its largest diameter, the guide diameter 3 and the tip 10, respectively.
  • the molding blank 18 is inserted with its rear end, that is to say the pressure pin 1, into a so-called 6 ° driver 24, which is part of a workpiece drive 34 free of lateral force, in such a way that it passes over the between the pressure pin 1 and the clearance 2 of the needle stroke support 5 lying edge is taken when the driver 24 itself is set in rotation.
  • the driver 24 is retractable in the direction of the workpiece headstock 25 in order to insert the molding blank 18 from the side of the workpiece headstock 25 into the centering bezel 23 before the driver 24 is brought into operative connection with the molding blank 18.
  • the centering bezel 23 is essentially a U-shaped support 26 which, like a hollow counter tip, is connected to the tailstock 27 of the advantageously NC-controlled grinding machine and exactly bears in the intermediate tip axis D completely drilled hollow tip 28 through which the molded part blank 18 can pass in such a way that the hollow tip 28 guides and centers it at a point that no longer needs to be ground when the molded part blank 18 is finished and is designed as a steady rest .
  • the steady rest 8 of the groove 7 is received by the hollow tip 28 such that only the guide diameter 3, which, as mentioned above, must be ground in pairs, is effectively ground “between tips”.
  • the needle shaft 4 and the adjoining tip 10 with their cone segments to be finished, the seat angle 11 and the clearance angle 12 protrude in the direction of the tailstock 27 from the hollow tip 28 such that the needle shaft 4 with the adjoining seat angle 11 and clearance angle 12 is free-standing the fine grinding profile grinding wheel 29 projecting into the intermediate bezel 23 can be ground.
  • the intermediate bezel 23 according to the invention makes it possible for a plurality of its cylindrical regions and also one end region to be ground to size in a single clamping of the molding blank 18.
  • the cylindrical region is the guide diameter 3 to be milled, which can be finish-ground either by a fine-grinding profile grinding wheel used specifically for this purpose or by part of a combined fine-grinding profile grinding wheel 29 according to FIG. 3.
  • the end region is the tip 10 of the molding blank 18.
  • the tool headstock is advantageously equipped with a device according to Swiss Pat. No. 623 261 for cylindrical grinding of workpieces.
  • the fine grinding profile grinding wheel 29 can also be adjusted laterally at right angles to its normal feed direction according to double arrow E in accordance with double arrow F such that that part of the fine grinding Profile grinding wheel 29, or possibly a separate grinding wheel, which is used for finish grinding the seat angle 11 and the clearance angle 12 of the tip 10, in addition to the finish grinding of these angles, also ensures the correct length of the nozzle needle.
  • a support bezel can also support the free-standing part of the molded part blank 18 in this grinding process in order to prevent an undesired deformation of this part.
  • two fine grinding wheels are advantageously combined to form a single one, in order to be used as a one-piece fine grinding profile grinding wheel 29.
  • it can also be removed automatically, in such a way that the nozzle needles that have been ground with it have the highest precision and the best surface quality.
  • the fine grinding profile grinding wheel 29 can be provided with two individually used profiles 32 and 33, such that, for example, simultaneously with the final grinding of the guide diameter 3 to be mated by means of the first profile 32 according to Fig. 4, the seat angle 11 is ground and the clearance angle 12 is pre-ground, whereas the clearance angle 12 is finish-ground after the fine-grinding profile grinding wheel 29 has been retracted and moved up again by means of the second profile 33 according to FIG. 5.
  • a molded part that can only be ground to size in a number of workpiece clamps can be ground to size in two work steps with a single workpiece clamping between centers.
  • molded parts other than nozzle needles for injection pumps can also be produced inexpensively on a device according to the invention and with a reduced number of clampings compared to the conventional manufacturing processes. It is sufficient to adapt the profile grinding wheels 20 and 29 as well as the centering bezel 23 which serves to clamp the molding blank 18 to the specific circumstances. Inventive addition is no longer necessary.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

For grinding directly between tips a moulding blank (18) that must be ground to size at one or several of its cylindrical or conical areas (3, 4) as well as at one of its ends (10) without having to shift it, a U-shaped back rest (23) is used to offset the hollow tip (28) of the tailstock (27) in the direction of the tool headstock (25). The hollow tip (28) is also totally hollowed out and shaped as a lunette, so that part of the moulding blank (18) can pass through it. This part (4; 10) stands then isolated between the tool headstock (25) and the tailstock (27), where it can be shaped by a grinding wheel (29) that can be moved even beyond the intermediate axis (d) of the tip. A shift of the moulding blank (18) can thus be avoided, and it becomes possible to grind the latter to size after a single clamping between tips.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung gemäss dem Oberbegriff des Patentanspruchs 1, mittels welcher vorgeschliffene Formteilrohlinge auf Mass geschliffen werden können.The present invention relates to a device according to the preamble of claim 1, by means of which pre-ground molded blanks can be ground to size.

Es ist bekannt, bezüglich ihrer Längsachse symmetrische profilierte Formteile mittels Décolletage und anschliessendem Schleifen herzustellen. Derartige Teile werden, sofern an ihre Masshaltigkeit und Achssymmetrie hohe Anforderungen gestellt werden, herkömmlicherweise nach dem Décolletieren und gegebenenfalls einem Härten in einer Zenterless-Schleifoperation vorgeschliffen und dann in einer oder mehreren Schleifoperationen auf Mass geschliffen.It is known to produce profiled molded parts which are symmetrical with respect to their longitudinal axis by means of décolletage and subsequent grinding. If high demands are made on their dimensional accuracy and axis symmetry, such parts are conventionally pre-ground after decolleting and if necessary hardening in a centerless grinding operation and then ground to size in one or more grinding operations.

Dieses auf Mass schleifen der vorgeschliffenen Formteile muss, sofern auch nur ein Ende des Formteiles auf Mass geschliffen werden muss und eine hohe Masshaltigkeit, insbesondere der Zylindrizität oder Konizität eines anderen Bereiches des Formteiles verlangt wird, ein Schleifen zwischen Spitzen sein, das in zwei oder mehr nacheinander geschalteten Schleifoperationen mit dazwischenliegendem Umspannen der Formteile auf der Schleifmaschine, geschieht.This grinding of the pre-ground molded parts to size, if only one end of the molded part has to be ground to size and a high degree of dimensional accuracy, in particular the cylindricity or taper of another area of the molded part is required, must be grinding between tips, which can be done in two or more successive grinding operations with intermediate reclamping of the molded parts on the grinding machine.

Ein solches Schleifverfahren in mehreren Schleifoperationen bei unterschiedlichen Formteileinspannungen ist sehr arbeitsintensiv und zeitaufwendig und erschwert, wenn nicht sogar verunmöglicht, das genaue Einhalten hochpräziser Masse. Es ist zudem zwangsläufig teuer.Such a grinding process in several grinding operations with different molded part clamps is very labor-intensive and time-consuming and complicates, if not impossible, the exact maintenance of high-precision mass. It is also inevitably expensive.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine Vorrichtung vorzuschlagen, mittels welcher die Nachteile des herkömmlichen auf Mass schleifen vorgeschliffener Formteilrohlinge überwunden und kostengünstig hochpräzise achssymmetrische profilierte Formteile möglichst in einem einzigen Schleifvorgang zwischen Spitzen auf Mass geschliffen werden können, selbst wenn ein Endbereich der Formteilrohlinge dabei mitgeschliffen werden muss.The present invention is based on the object of proposing a device by means of which the disadvantages of conventional pre-ground molded blanks can be overcome and cost-effective, high-precision, axially symmetrical profiled molded parts can be ground to size in a single grinding process between tips, even if an end region of the molded blanks must also be sanded.

Erfindungsgemäss wird diese Aufgabe durch eine Vorrichtung gemäss Patentanspruch 1 gelöst.According to the invention, this object is achieved by a device according to claim 1.

Dank der Erfindung ist es erstmals möglich, rationell und wirtschaftlich hochpräzise achssymmetrische Formteile, die bisher mittels zwei oder mehreren Schleifoperationen bei unterschiedlichen Einspannungen der Formteilrohlinge auf der Schleifmaschine auf Mass geschliffen werden mussten, in einer einzigen Operation zwischen Spitzen auf Mass zu schleifen. Auch mehrfach abgesetzte Formteile können dank der Erfindung in der Regel in einer einzigen Einspannung zwischen Spitzen fertig auf Mass geschliffen werden, was sich positiv auf die Wirtschaftlichkeit der Fertigung und die Masshaltigkeit der Formteile auswirkt.Thanks to the invention, it is now possible for the first time to efficiently and economically high-precision axisymmetric molded parts, which previously had to be ground to size using two or more grinding operations with different clamping of the molded part blanks on the grinding machine, in a single operation between centers. Thanks to the invention, multiply offset molded parts can generally be finished to size in a single clamping between tips, which has a positive effect on the economy of manufacture and the dimensional accuracy of the molded parts.

Weitere Vorteile und Details der Erfindung gehen aus der folgenden Beschreibung und der dieser zugeordneten Zeichnung hervor. Darin wird die Erfindung an einem speziell schwierigen Massenteil, nämlich einer Düsennadel für Einspritzdüsen, näher erläutert.Further advantages and details of the invention will become apparent from the following description and the associated drawing. The invention is explained in more detail in a particularly difficult mass part, namely a nozzle needle for injection nozzles.

In der Zeichnung zeigt

  • Fig. 1 eine typische Düsennadel für Einspritzdüsen in Seitenansicht, in vergrössertem Massstab,
  • Fig. 2 schematisch die Anordnung einer Vorrichtung, in welcher ein erster Verfahrensschritt zur Herstellung eines Formteiles vorgenommen wird, nämlich die Vorbearbeitung und das bestechen des Rohlings von der Stange, von oben her gesehen,
  • Fig. 3 eine erfindungsgemässe Vorrichtung, die dazu dient, den vorgeschliffenen Formteilrohling erfindungsgemäss in einer einzigen Einspannung zwischen Spitzen und in einem einzigen Schleifvorgang fertig auf Mass zu schleifen, von oben her gesehen, teilweise geschnitten,
  • Fig. 4 ein Detail der Bearbeitung der Nadelspitze, ebenfalls von oben her gesehen, und
  • Fig. 5 ein weiteres Detail der Bearbeitung der Nadelspitze, von oben her gesehen.
  • Fig. 1 zeigt in vergrössertem Massstab eine Düsennadel für Benzineinspritzdüsen, wie sie vorteilhafterweise mittels dem erfindungsgemässen Verfahren in der erfindungsgemässen Vorrichtung in einem einzigen Schleifvorgang zwischen Spitzen auf Mass geschliffen werden kann, sofern der dazu benötigte Formteilrohling zumindest die Präzision eines zenterlessgeschliffenen Teiles aufweist oder wie hiernach beschrieben aus einer Stange von Rundstahl herausgeschliffen worden ist. Wenn man bedenkt, dass ein derartiges Teil, das eine Länge von ca 50 mm und einen mittleren Durchmesser von ca 4,8 mm aufweist, auf 0,001 mm genau geschliffen werden muss und an seiner Spitze einen maximalen Schlag von 0,001 mm aufweisen darf, dank der Erfindung, die vorteilhafterweise in Rombination mit dem nachfolgend beschriebenen Herausschleifens des Formteilrohlings aus einer Stange vollautomatisch mit einer einzigen Operation des Schleifens auf Mass zwischen Spitzen herstellbar ist, wird offensichtlich, welch enorme Verbesserungen die Erfindung im auf Mass schleifen und daher der Serienfertigung auch schwieriger hochpräzieser Formteile gegenüber den heutigen Herstellverfahren bringt. Dabei gilt es zu beachten, dass diese Düsennadel neben zylindrischen Teilen, bei denen es sich um einen Düsenzapfen 1, eine Freistellung 2, einen Führungsdurchmesser 3 und einen Nadelschaft 4 handelt, auch ein präzise im rechten Winkel zu der Düsennadel-Längsaches A zu schleifendes Teilende 1′, eine Nadelhubauflage 5 und einen Freistellübergang 6 aufweist. Der Nadelschaft 4 ist, wie erkenntlich, durch eine Nut 7 vom Führungsdurchmesser 3 abgesetzt, wobei die Nut 7 durch zwei unterschiedliche, definierte Winkel aufweisende Konen, nämlich einen Lünettensitz 8 und eine Phase 9, begrenzt wird. Die Spitze 10 der Düsennadel weist zwei unterschiedlich geneigte Konussegmente, nämlich einen Sitzwinkel 11 und einen Freiwinkel 12 auf, die sowohl bezüglich Winkel als auch Konuslänge hochpräzise sein müssen um ein ordnungsgemässes Funktionnieren der Einspritzdüse sicherzustellen. Der zylindrische Führungsdurchmesser 3 dieser Düsennadel muss nicht nur eine perfekte Zylindrizität aufweisen, sondern muss auch mit der Innenbohrung des die Düsennadel aufnehmenden Nadelgehäuses (nicht dargestellt) paarungsgeschliffen werden, derart dass eine spielfreie Führung garantiert werden kann.
In the drawing shows
  • 1 shows a typical nozzle needle for injection nozzles in side view, on an enlarged scale,
  • Fig. 2 shows schematically the arrangement of a device in which a first process step for the production of a molded part is carried out, namely the preprocessing and bribing of the blank from the bar, seen from above,
  • 3 shows a device according to the invention, which is used to finish-grind the pre-ground molded blank according to the invention in a single clamping between tips and in a single grinding operation, viewed from above, partially cut,
  • Fig. 4 shows a detail of the processing of the needle tip, also seen from above, and
  • Fig. 5 shows another detail of the processing of the needle tip, seen from above.
  • 1 shows, on an enlarged scale, a nozzle needle for gasoline injection nozzles, such as can advantageously be ground to size in a single grinding process between tips in the device according to the invention using the method according to the invention, provided that the molding blank required for this has at least the precision of a centerless ground part or as follows described has been ground out of a rod of round steel. If you consider that such a part, which has a length of approx. 50 mm and an average diameter of approx. 4.8 mm, has to be ground to an accuracy of 0.001 mm and has a maximum impact of 0.001 mm at its tip, thanks to the Invention, which can advantageously be produced fully automatically in combination with the grinding of the blank from a rod described below with a single operation of grinding to size between tips, becomes obvious what enormous improvements the invention grinds to size and therefore the series production of difficult, high-precision molded parts compared to today's manufacturing processes. It should be noted that this nozzle needle in addition to cylindrical parts, which are a nozzle journal 1, an exemption 2, a guide diameter 3 and a needle shaft 4, also has a part end 1 'to be ground precisely at right angles to the nozzle needle longitudinal axis A', a needle stroke support 5 and a release transition 6. As can be seen, the needle shaft 4 is offset from the guide diameter 3 by a groove 7, the groove 7 being delimited by two different, defined cones, namely a steady rest 8 and a phase 9. The tip 10 of the nozzle needle has two differently inclined cone segments, namely a seat angle 11 and a clearance angle 12, which must be highly precise with respect to both the angle and the cone length in order to ensure proper functioning of the injection nozzle. The cylindrical guide diameter 3 of this nozzle needle not only has to have perfect cylindricity, but also has to be mated with the inner bore of the needle housing receiving the nozzle needle (not shown) so that play-free guidance can be guaranteed.

Der Fachmann erkennt aus diesen Angaben, dass es sich bei diesem für die Illustration der vorliegenden Erfindung gewählten repräsentativen Formteil um ein ausserordentlich anspruchsvolles Teil handelt, das in den herkömmlichen Verfahren und mit den herkömmlichen Mittel ausserordentlich schwierig zu fertigen ist und dessen Serienfertigung mittels dem herkömmlichen Verfahren des Décolletierens und schrittweisen Schleifens der unterschiedlichen Durchmesser und Winkel sehr teuer zu stehen kommt. Dieses anspruchsvolle Teil eignet sich aber sehr gut dazu, die Vorteile und Möglichkeiten der gegenständlichen Erfindung gegenüber den herkömmlichen Herstellverfahren solcher Teile darzulegen.Those skilled in the art will recognize from this information that this representative molded part chosen for the illustration of the present invention is an extraordinarily demanding part, which is extremely difficult to produce in the conventional methods and with the conventional means, and its series production by means of the conventional method of decolletizing and gradual grinding of the different diameters and angles is very expensive. However, this sophisticated part is very well suited to demonstrate the advantages and possibilities of the present invention compared to the conventional manufacturing processes for such parts.

Für die Beurteilung der Vorteile, die die vorliegende Erfindung gegenüber dem Stand der Technik bringt, ist davon auszugehen, dass bei jedem zum Stand der Technik gehörenden Verfahren zur Herstellung einer solcher Düsennadel ein Düsennadelrohling mittels einer Décolletage-Operation aus einer ungehärteten Stahlstange herausgedreht wird, worauf dieser Rohling gehärtet und im Rahmen eines Zenterless-Schleifens vorgeschliffen wird bevor in einzelnen Schleif Operationen, bei unterschiedlichen Einspannungen des Formteilrohlings 18 zuerst der Führungsdurchmesser 3 und dann der Sitzwinkel 11 und der Freiwinkel 12 der Spitze 10 geschliffen werden. Dabei ist es nahezu unmöglich, die geforderte Achsparallelität mit dem als maximal zulässig bezeichneten Schlag sicherzustellen, denn für das Zylindrischschleifen des Führungsdurchmessers 3 ist der Formteilrohling anders eingespannt, als er für das Schleifen der beiden Konussegmente 11 und 12 der Spitze 10 in einer Spannzange eingespannt werden muss.For the assessment of the advantages that the present invention has over the prior art, it must be assumed that in every method belonging to the prior art for producing such a nozzle needle, a nozzle needle blank starts out by means of a décolletage operation an unhardened steel rod is unscrewed, whereupon this blank is hardened and pre-ground as part of a centerless grinding process before the guide diameter 3 and then the seat angle 11 and then the clearance angle 12 of the tip 10 are ground in individual grinding operations with different clamping of the molding blank 18. It is almost impossible to ensure the required axis parallelism with the stroke designated as the maximum permissible, because the shaped blank is clamped differently for the cylindrical grinding of the guide diameter 3 than it is clamped in a collet for grinding the two cone segments 11 and 12 of the tip 10 got to.

Zwecks Herstellung der für das auf Mass schleifen gemäss der Erfindung notwendigen Formteilrohlinge kann, an Stelle des Décolletierens und Zenterless-Schleifens vorteilhafterweise ein Schleifvorgang verwendet werden, wie er hiernach anhand von Fig. 2 beschrieben ist. In letzterer erkennt man eine Stange 13 von Rundmaterial, vorteilhafterweise ungehärteter oder gehärteter Stahl, die durch eine erste Spannzange 14 eines lediglich schematisch und strichpunktiert angedeuteten Werzeugspindelstockes 15 hindurch vorgeschoben wird und aus der heraus die Formteilrohlinge 18 in Serie herauszuformen sind. Der ersten Spannzange 14 gegenüber ist auf der selben Achse B eine zweite Spannzange 16 in einem Synchron-Werkzeugspindelstock 17 angeordnet, in die die Stange 13, resp. ein noch mit der Stange 13 verbundener, vorbearbeiteter Formteilrohling 18 bis an einen einstell- und verstellbaren Anschlag 19 heran eingeführt ist. Vorteilhafter Weise sind die beiden Werkzeugspindelstöcke Bestandteile einer NC-gesteuerten Maschine, die eine automatische Steuerung aller Arbeitsabläufe und -gänge ermöglicht.In order to produce the molding blanks required for grinding to size in accordance with the invention, a grinding process, as described hereinafter with reference to FIG. 2, can advantageously be used instead of the decolletizing and centerless grinding. In the latter one can see a rod 13 of round material, advantageously unhardened or hardened steel, which is pushed through a first collet 14 of a tool headstock 15, which is indicated only schematically and in dash-dot lines, and from which the molded part blanks 18 are to be molded in series. The first collet 14 opposite a second collet 16 is arranged on the same axis B in a synchronous tool headstock 17 into which the rod 13, respectively. a pre-machined molding blank 18 still connected to the rod 13 is inserted up to an adjustable and adjustable stop 19. The two tool headstocks are advantageously components of an NC-controlled machine that enables automatic control of all work processes and operations.

Ferner erkennt man in Fig. 2 eine Profilschleifscheibe 20 und eine Stützlünette 21. Es fällt auch auf, dass die Achse B gegenüber der durch den Doppelpfeil C illustrierten Vorschubachse der Profilschleifscheibe 20 nicht in einem rechten Winkel steht, sondern geneigt dazu liegt. Eine Neigung von ca 10° hat sich bewährt und ermöglicht es, das senkrecht zur Längsachse A des Formteils zu stehen kommende Teilende 1′ und die Nadelhubauflage 5 und den Freistellungsübergang 6 in einem einzigen Schleifvorgang korrekt rechtwinklig zur besagten Längsachse A des Formteiles zu schleifen. Es ist selbstverständlich, dass der Umfang der Profilschleifscheibe 20 in bekannter Art und Weise ohne Ausspannen der Profilschleifscheibe 20 in Abhängigkeit der Neigung der Achse B und des dem vorbearbeiteten Formteilrohling 18 zu gebenden Profil in regelmässigen Abständen direkt auf der NCgesteuerten Maschine, z.B. mittels einer Diamantrolle, abgezogen wird. Der dadurch bedingte Abtrag von Schleifscheibenmaterial wird in bekannter Weise bei der automatischen Berechnung des Profilschleifscheibenvorschubs berücksichtig. Vorteilhafterweise ist die Profilschleifscheibe 20 so ausgelegt, dass sie in einem Arbeitsgang gleichzeitig einen Teil eines ersten Formteilrohlings 18′ vorschleift und zumindest einen Teil oder den ganzen Formteilrohling 18˝ fertigschleift und ihn vom fertig vorbearbeiteten und teilweise in der zweiten Spannzange 16 liegenden Formteilrohling 18 trennt. Um zu verhindern, dass der dabei in Bearbeitung stehende Formteilrohling 18˝ durch die Profilschleifscheibe 20 aus der Achse B und damit der Längsachse A des Formteils selber herausgedrückt wird, ist die Stützlünette 21 entsprechend angeordnet.A profile grinding wheel 20 and a support bezel 21 can also be seen in FIG. 2. It is also noticeable that the axis B is opposite that illustrated by the double arrow C. Feed axis of the profile grinding wheel 20 is not at a right angle, but is inclined to it. An inclination of approx. 10 ° has proven itself and makes it possible to grind the part end 1 'coming perpendicular to the longitudinal axis A of the molded part 1' and the needle lifting support 5 and the release transition 6 in a single grinding operation correctly at right angles to said longitudinal axis A of the molded part. It goes without saying that the circumference of the profile grinding wheel 20 in a known manner without unclamping the profile grinding wheel 20 depending on the inclination of the axis B and the profile to be given to the pre-machined molding blank 18 at regular intervals directly on the NC-controlled machine, for example by means of a diamond roller, is subtracted. The resulting removal of grinding wheel material is taken into account in a known manner in the automatic calculation of the profile grinding wheel feed. Advantageously, the profile grinding wheel 20 is designed such that it pre-grinds part of a first molded part blank 18 'at the same time and finely grinds at least some or all of the molded part blank 18' in one work step and separates it from the fully pre-machined molded part 18 lying partially in the second collet 16. In order to prevent the molding blank 18 ′ being processed from being pressed out of the axis B and thus the longitudinal axis A of the molding itself by the profile grinding wheel 20, the support bezel 21 is arranged accordingly.

Sobald der in Bearbeitung stehende Formteilrohling 18˝ fertig vorgeschliffen ist, wird vorteilhafterweise die zweite Spannzange 16 im Synchron-Werkzeugspindelstock 17 geöffnet und so zurückgefahren, dass der teilweise in sie eingeführte und nun von der Stange 13 getrennte Formteilrohling 18 mittels des Anschlags 19 aus ihr herausgestossen werden kann, bevor die Stange 13 so weit vorgeschoben wird, bis der noch mit ihr verbundene Formteilrohling 18˝ an die Stelle des Formteilrohlings 18 in die zweite Spannzange 16 eingefahren wird. Dann, eventuell nach einem vorgängigen Abziehen der Profilschleifscheibe 20, erfolgt wiederum der hiervor beschriebene Schleifvorgang, bei welchem ein Teil eines neuen Formteilrohlings 18′ vorgeschliffen und ein Teil oder der ganze Formteilrohling 18˝ bis auf das Abtrennen von der Stange 13 fertiggeschliffen wird. Es kann bei diesem Arbeitsgang angezeigt sein, einen kritischen Teildurchmesser während des Schleifvorganges mittels eines Durchmessermesskopfes 22 zu überwachen, derart, dass der Profilscheibenvorschub in Abhängigkeit dieses Teilemasses gesteuert werden kann.As soon as the molding blank 18 'being processed is pre-ground, the second collet 16 in the synchronous tool headstock 17 is advantageously opened and retracted in such a way that the molding blank 18 which is partially inserted into it and is now separated from the rod 13 is pushed out of it by means of the stop 19 can be before the rod 13 is pushed so far until the molded part blank 18 'still connected to it in the place of the molded part blank 18 is inserted into the second collet 16 becomes. Then, possibly after a previous removal of the profile grinding wheel 20, again the grinding process described above takes place, in which a part of a new molding blank 18 'is pre-ground and a part or the whole of the molding blank 18' is ground to the point of separation from the rod 13. In this work step it may be appropriate to monitor a critical part diameter during the grinding process by means of a diameter measuring head 22 such that the profile disk feed can be controlled as a function of this part dimension.

Die gemäss obiger Schleifoperation erzeugten Formteilrohlinge 18 sind, sofern sie aus gehärteten Stangen 13 herausgeschliffen sind, fertig bearbeitet und weisen zumindest die Masshaltigkeit und Oberflächengüte zenterlessgeschliffener Teile auf. Sie können daher ohne weitere Vorbearbeitung direkt dem auf Mass schleifen zugeführt werden.The molded part blanks 18 produced according to the above grinding operation, provided they have been ground out of hardened rods 13, are finished and at least have the dimensional accuracy and surface quality of centerless ground parts. They can therefore be fed directly to grinding to size without further preprocessing.

Auch wenn die Formteilrohlinge 18 aus ungehärteten Stangen 13 herausgeschliffen werden, sind sie wesentlich masshaltiger, als wenn sie mittels einer Décolletageoperation hergestellt worden wären. Bei einem anschliessenden sorgfältigen Härten verziehen sie sich praktisch nicht, so dass, wenn sie mit Uebermassen versehen sind, die erst anlässlich des Schleifens auf Mass abgetragen werden, sie direkt und ohne weitere Vorbearbeitung auf Mass geschliffen werden können.Even if the molding blanks 18 are ground out of unhardened rods 13, they are considerably more dimensionally stable than if they had been produced by means of a décolletage operation. In the case of a subsequent careful hardening, they practically do not warp, so that if they are provided with excesses that are only removed to size on the occasion of grinding, they can be ground to size directly and without further preprocessing.

In jedem Falle erübrigt diese Art der Herstellung der Formteilrohlinge ein Zenterless-Schleifen derselben vor dem auf Mass schleifen in der erfindungsgemässen Vorrichtung gemäss Fig. 3.In any case, this type of production of the molded part blanks eliminates the need for centerless grinding of the blanks before grinding to size in the device according to the invention according to FIG. 3.

Das auf Mass schleifen der Formteilrohlinge 18 ist in den Fig. 3, 4 und 5 dargestellt, wobei die beiden letzteren Figuren nur Details einzelner Arbeitsschritte illustrieren und Fig. 3 die Formteilrohling-Aufnahme und eine Feinschleif-Profilschleifscheibe 29 zeigt, mittels der der Formteilrohling 18 zu der fertig bearbeiteten hochpräzisen und mit der Innenbohrung des nicht dargestellten Düsennadelgehäuses paarungsgeschliffenen Düsennadel fertigbearbeitet wird. Dank dem erfindungsgemässen Verfahren und der erfindungsgemässen Vorrichtung kann die Fertigbearbeitung der Düsennadel wie erwähnt in einer einzigen Einspannung des Formteilrohlings 18 zwischen Spitzen geschehen. Da dieser Formteilrohling 18 lediglich an seinem grössten Durchmesser, dem Führungsdurchmesser 3 sowie der Spitze 10, resp. deren Sitzwinkel 11 und Freiwinkel 12 nachgeschliffen werden muss, um einerseits die Zylindrizität des Führungsdurchmessers 3 und dessen vorbestimmtes Spiel in der Innenbohrung des Düsengehäuses mittels Paarungsschleifen zu erzeugen und andererseits die Spitze 10 mit dem vorbestimmten maximalen Schlag auf die Längsachse A der Düsennadel zu legen, kann er nicht, wie sonst üblich, zwischen Hohlspitzmitnehmern, in die die beiden Teilenden zu liegen kommen, geschliffen werden. Es bedarf dazu einer speziellen Zentrierlünette 23 (Fig. 3) gemäss der vorliegenden Erfindung.3, 4 and 5, the latter two figures only illustrating details of individual work steps and FIG. 3 the molded part blank receptacle and a fine grinding profile grinding wheel 29 shows by means of which the molded part blank 18 is finished to produce the finished, highly precise nozzle needle milled with the inner bore of the nozzle needle housing (not shown). Thanks to the method and the device according to the invention, the machining of the nozzle needle can, as mentioned, be carried out in a single clamping of the molding blank 18 between tips. Since this molding blank 18 only at its largest diameter, the guide diameter 3 and the tip 10, respectively. whose seat angle 11 and clearance angle 12 must be reground, on the one hand to create the cylindricity of the guide diameter 3 and its predetermined play in the inner bore of the nozzle housing by means of pairing loops, and on the other hand to place the tip 10 with the predetermined maximum stroke on the longitudinal axis A of the nozzle needle it is not, as is customary, ground between hollow point drivers in which the two ends of the part come to rest. This requires a special centering bezel 23 (FIG. 3) according to the present invention.

Aus Fig. 3 ist ersichtlich, dass der Formteilrohling 18 mit seinem hinteren Ende, also dem Druckzapfen 1, in einen sogenannten 6° -Mitnehmer 24 eingelegt wird, der Teil eines querkraftfreien Werkstückantriebes 34 ist, derart, dass er über die zwischen dem Druckzapfen 1 und der Freistellung 2 der Nadelhubauflage 5 liegende Kante mitgenommen wird, wenn der Mitnehmer 24 selbst in Drehung versetzt wird. Vorteilhafterweise ist der Mitnehmer 24 in Richtung des Werkstückspindelstockes 25 zurückziehbar, um den Formteilrohling 18 von der Seite des Werkstückspindelstockes 25 her in die Zentrierlünette 23 einzuführen, bevor der Mitnehmer 24 mit dem Formteilrohling 18 in Wirkverbindung gebracht wird. Bei der Zentrierlünette 23 handelt es sich im wesentlichen um einen U-förmigen Träger 26, der ähnlich einer Hohlgegenspitze mit dem Reitstock 27 der vorteilhafterweise NC-gesteuerten Schleifmaschine verbunden wird und eine genau in der Zwischenspitzenachse D liegende ganz durchgebohrte Hohlspitze 28 trägt, durch die der Formteilrohling 18 hindurchtreten kann, derart, dass die Hohlspitze 28 ihn an einer Stelle führt und zentriert, die anlässlich der Fertigbearbeitung des Formteilrohlings 18 nicht mehr geschliffen werden braucht und als Lünettensitz ausgebildet ist.From FIG. 3 it can be seen that the molding blank 18 is inserted with its rear end, that is to say the pressure pin 1, into a so-called 6 ° driver 24, which is part of a workpiece drive 34 free of lateral force, in such a way that it passes over the between the pressure pin 1 and the clearance 2 of the needle stroke support 5 lying edge is taken when the driver 24 itself is set in rotation. Advantageously, the driver 24 is retractable in the direction of the workpiece headstock 25 in order to insert the molding blank 18 from the side of the workpiece headstock 25 into the centering bezel 23 before the driver 24 is brought into operative connection with the molding blank 18. The centering bezel 23 is essentially a U-shaped support 26 which, like a hollow counter tip, is connected to the tailstock 27 of the advantageously NC-controlled grinding machine and exactly bears in the intermediate tip axis D completely drilled hollow tip 28 through which the molded part blank 18 can pass in such a way that the hollow tip 28 guides and centers it at a point that no longer needs to be ground when the molded part blank 18 is finished and is designed as a steady rest .

Bei der hier beschriebenen Düsennadel wird der Lünettensitz 8 der Nut 7 durch die Hohlspitze 28 aufgenommen, derart, dass nur der Führungsdurchmesser 3, der wie vorerwähnt paarungsgeschliffen werden muss, effektiv "zwischen Spitzen" geschliffen wird. Der Nadelschaft 4 und die daran anschliessende Spitze 10 mit ihren fertigzuschleifenden Konussegmenten, dem Sitzwinkel 11 und dem Freiwinkel 12 ragen in Richtung des Reitstockes 27 aus der Hohlspitze 28 heraus, derart, dass der Nadelschaft 4 mit den daran anschliessenden Sitzwinkel 11 und Freiwinkel 12 freistehend durch die in die Zwischenlünette 23 hineinragende Feinschleif-Profilschleifscheibe 29 geschliffen werden können. Die erfindungsgemässe Zwischenlünette 23 ermöglicht es, dass in einer einzigen Einspannung des Formteilrohlings 18 sowohl mehrere seiner zylindrischen Bereiche als auch ein Endbereich auf Mass fertiggeschliffen werden können. Bei der hier beschriebenen Düsennadel handelt es sich beim zylindrischen Bereich um den paarungszuschleifenden Führungsdurchmesser 3, der entweder durch eine eigens dafür verwendete Feinschleif-Profilschleifscheibe oder einen Teil einer kombinierten Feinschleif-Profilschleifscheibe 29 gemäss Fig. 3 fertiggeschliffen werden kann. Beim Endbereich handelt es sich um die Spitze 10 des Formteilrohlings 18. Mittels eines Doppelmesskopfes 30 kann in bekannter Art und Weise die Zylindrizität des Führungsdurchmessers 3 als auch dessen genauer Durchmesser gemessen und sichergestellt werden. Der Werkzeugspindelstock ist diesbezüglich vorteilhafterweise mit einer Vorrichtung gemäss CH-Pat. Nr. 623 261 zum Zylindrischschleifen von Werkstücken, versehen. Durch eine Messung der Längsposition des Formteilrohlings 18 im Mitnehmer 24, resp. der genauen Lage z.B. der Nadelhubauflage 5 auf der Zwischenspitzenachse D mittels eines hier nur andeutungsweise dargestellten handelsüblichen Längenpositionmessgerätes 31, kann die Feinschleif-Profilschleifscheibe 29 rechtwinklig zu ihrer normalen Vorschubrichtung gemäss Doppelpfeil E auch seitlich gemäss Doppelpfeil F verstellt werden, derart, dass derjenige Teil der Feinschleif-Profilschleifscheibe 29, oder gegebenenfalls eine separate Schleifscheibe, der zum Fertigschleifen des Sitzwinkels 11 und des Freiwinkels 12 der Spitze 10 dient, neben dem Fertigschleifen dieser Winkel auch die korrekte Länge der Düsennadel sicherstellt. Sofern aus Festigkeitsgründen erforderlich, kann auch bei diesem Schleifvorgang eine hier nicht dargestellte Stützlünette den freistehenden Teil des Formteilrohlings 18 abstützen, um einer nicht gewünschten Verformung dieses Teiles vorzubeugen. Vorteilhafterweise werden, für Formteile wie die hier beschriebenen Düsennadeln, zwei Feinschleifscheiben zu einer einzigen zusammengefügt, um als einteilige Feinschleif-Profilschleifscheibe 29 eingesetzt zu werden. Auch sie kann, wie auf NC-gesteuerten Schleifmaschinen üblich, regelmässig automatisch abgezogen werden, derart, dass die damit fertiggeschliffenen Düsennadeln höchste Präzision und beste Oberflächengüte aufweisen.In the case of the nozzle needle described here, the steady rest 8 of the groove 7 is received by the hollow tip 28 such that only the guide diameter 3, which, as mentioned above, must be ground in pairs, is effectively ground “between tips”. The needle shaft 4 and the adjoining tip 10 with their cone segments to be finished, the seat angle 11 and the clearance angle 12 protrude in the direction of the tailstock 27 from the hollow tip 28 such that the needle shaft 4 with the adjoining seat angle 11 and clearance angle 12 is free-standing the fine grinding profile grinding wheel 29 projecting into the intermediate bezel 23 can be ground. The intermediate bezel 23 according to the invention makes it possible for a plurality of its cylindrical regions and also one end region to be ground to size in a single clamping of the molding blank 18. In the case of the nozzle needle described here, the cylindrical region is the guide diameter 3 to be milled, which can be finish-ground either by a fine-grinding profile grinding wheel used specifically for this purpose or by part of a combined fine-grinding profile grinding wheel 29 according to FIG. 3. The end region is the tip 10 of the molding blank 18. By means of a double measuring head 30, the cylindricity of the guide diameter 3 and its exact diameter can be measured and ensured in a known manner. In this regard, the tool headstock is advantageously equipped with a device according to Swiss Pat. No. 623 261 for cylindrical grinding of workpieces. By a Measurement of the longitudinal position of the blank 18 in the driver 24, respectively. the exact position of, for example, the needle stroke support 5 on the intermediate tip axis D by means of a commercially available length position measuring device 31, which is only indicated here, the fine grinding profile grinding wheel 29 can also be adjusted laterally at right angles to its normal feed direction according to double arrow E in accordance with double arrow F such that that part of the fine grinding Profile grinding wheel 29, or possibly a separate grinding wheel, which is used for finish grinding the seat angle 11 and the clearance angle 12 of the tip 10, in addition to the finish grinding of these angles, also ensures the correct length of the nozzle needle. If necessary for reasons of strength, a support bezel, not shown here, can also support the free-standing part of the molded part blank 18 in this grinding process in order to prevent an undesired deformation of this part. For molded parts such as the nozzle needles described here, two fine grinding wheels are advantageously combined to form a single one, in order to be used as a one-piece fine grinding profile grinding wheel 29. As usual on NC-controlled grinding machines, it can also be removed automatically, in such a way that the nozzle needles that have been ground with it have the highest precision and the best surface quality.

Für das Fertigschleifen des Sitzwinkels 11 und des Freiwinkels 12 der Spitze 10 kann die Feinschleif-Profilschleifscheibe 29 mit zwei individuell zum Einsatz kommenden Profilen 32 und 33 versehen sein, derart, dass beispielsweise gleichzeitig mit dem Fertigschleifen des paarungszuschleifenden Führungsdurchmessers 3 mittels des ersten Profils 32 gemäss Fig. 4 der Sitzwinkel 11 fertiggeschliffen und der Freiwinkel 12 vorgeschliffen wird, wogegen der Freiwinkel 12 nach dem Zurückziehen der Feinschleif-Profilschleifscheibe 29 und deren erneutes Heranfahren mittels des zweiten Profils 33 gemäss Fig. 5 fertiggeschliffen wird.For the final grinding of the seat angle 11 and the clearance angle 12 of the tip 10, the fine grinding profile grinding wheel 29 can be provided with two individually used profiles 32 and 33, such that, for example, simultaneously with the final grinding of the guide diameter 3 to be mated by means of the first profile 32 according to Fig. 4, the seat angle 11 is ground and the clearance angle 12 is pre-ground, whereas the clearance angle 12 is finish-ground after the fine-grinding profile grinding wheel 29 has been retracted and moved up again by means of the second profile 33 according to FIG. 5.

Der Fachmann erkennt, dass dank der erfindungsgemässen Vorrichtung ein nach herkömmlichen Verfahren nur in mehreren Werkstückeinspannungen auf Mass schleifbares Formteil in zwei Arbeitsschritten mit einer einzigen Werkstückeinspannung zwischen Spitzen auf Mass geschliffen werden kann. Selbstverständlich können auf einer erfindungsgemässen Vorrichtungen auch andere Formteile als Düsennadeln für Einspritzpumpen kostengünstig und mit einer gegenüber den herkömmlichen Herstellverfahren reduzierten Anzahl von Einspannungen gefertigt werden. Es genügt dabei, die Profilschleifscheiben 20 und 29 sowie die der Aufspannung des Formteilrohlings 18 dienende Zentrierlünette 23 den konkreten Gegebenheiten anzupassen. Erfinderisches Dazutun ist dafür nicht mehr notwendig.A person skilled in the art will recognize that, thanks to the device according to the invention, a molded part that can only be ground to size in a number of workpiece clamps can be ground to size in two work steps with a single workpiece clamping between centers. Of course, molded parts other than nozzle needles for injection pumps can also be produced inexpensively on a device according to the invention and with a reduced number of clampings compared to the conventional manufacturing processes. It is sufficient to adapt the profile grinding wheels 20 and 29 as well as the centering bezel 23 which serves to clamp the molding blank 18 to the specific circumstances. Inventive addition is no longer necessary.

Es ist auch naheliegend, dass je nach herzustellendem Formteil bei der Vorbearbeitung desselben, also beim Heraustrennen aus der Stange 13 mittels Schleifoperation, je nach Bedarf nur einzelne Teile des Formteils vorbearbeitet werden, wogegen andere unbearbeitet bleiben. Auch bei der Fertigbearbeitung des Formteilrohlings 18 können mehr als die hier beschriebenen drei Formteil-Segmente fertiggeschliffen werden. Gegebenenfalls kann der Fertigbearbeitungsvorgang in zwei Einzeloperationen aufgeteilt werden.It is also obvious that, depending on the molded part to be manufactured, only some parts of the molded part are pre-processed as required during the pre-processing of the same, that is to say when cutting out from the rod 13 by means of a grinding operation, while others remain unprocessed. Even when the molding blank 18 is finished, more than the three molding segments described here can be finish-ground. If necessary, the finishing process can be divided into two individual operations.

Wenn ein automatisches Stangennachladegerät und eine automatische Formteileinspannvorrichtung verwendet werden, kann dank der Erfindung im Zusammenwirken mit dem beschriebenen Herausschleifen der Formteilrohlinge 18 aus der Stange 13 eine vollautomatische Formteile-Fertigung realisiert werden, die ohne manuelle Nachjustierung der Bearbeitungswerkzeuge auskommt, denn die Profilschleifscheiben 20 und 29 können direkt auf den NC-gesteuerten Schleifmaschinen mittels Diamantrollen abgezogen und automatisch nachgerichtet werden.If an automatic bar reloading device and an automatic molded part clamping device are used, thanks to the invention, in cooperation with the described grinding of the molded part blanks 18 out of the rod 13, a fully automatic molded part production can be realized, which does not require manual readjustment of the processing tools, because the profile grinding wheels 20 and 29 can be removed directly on the NC-controlled grinding machines using diamond rollers and automatically adjusted.

Wenn an Stelle von Stangen als Ausgangsmaterial für die Herstellung der Formteile Rollenmaterial verwendet wird, was dank der wesentlich niedrigeren Drehzahlen, die ein zu schleifendes Teil gegenüber einem zu décolletierenden Teil aufweisen muss, durchaus möglich ist, kann eine über mehrere Tage vollautomatische Teilefertigung realisiert werden, die ohne Einwirkung durch den Menschen völlig autonom arbeitet, was bei Décolletage-Operationen wegen der zwangsläufig notwendig werdenden Nachschleifoperationen der Stechbeutel ausserhalb der Maschine, und deren nachträglicher Nachjustierung in Handarbeit, nicht möglich ist.If, instead of bars, roll material is used as the starting material for the production of the molded parts, which is entirely possible thanks to the much lower speeds that a part to be ground must have compared to a part to be decolletized, fully automatic part production can be realized over several days, which works completely autonomously without human intervention, which is not possible in décolletage operations because of the inevitably necessary regrinding operations of the pouch outside the machine and their subsequent readjustment by hand.

Claims (4)

1. A device for grinding to size profiled, rough ground moulding blanks (18), which are symmetrical with respect to their longitudinal axis (A), containing on a grinding machine at least one tool headstock (25), a driving plate (24) operatively connected thereto, a double measuring head (30) acting thereon for the cylinder adjustement and the alignment of te longitudinal axis (A) of the moulding blank (18) on the axis (D) of the intermediate tip of the grinding machine and a tailstock (27) with a hollow tip (28) in such a way that the axis (D) of the intermediate tip is defined by the driving plate (24) and the hollow tip (28), characterised in that it comprises a U-shaped centering rest (23), one arm of which is connected to the tailstock (27) and the other arm of which, which is nearer the rool headstock (25), comprises the hollow tip (28), which is constructed in the form of a rest and is bored, with a conical part of the hollow tip (28) forming a latter tip-stretched rest (8).
2. A device according to Claim 1, characterised in that the driving plate (24) is a component of a workpiece drive (34) not subject to transverse forces and in conjunction with the length measuring head (30) permits an alignement of the longitudinal axis (A) of the moulding blank (18) on the axis (D) of the intermediate tip of the grinding machine, and in that the intermediate rest (23) is constructed in such a way that the self-supporting end region (10) of the moulding blank (10) between the hallow tip (28) and the tailstock (27) can be worked with a grinding disk (29) extending over the axis (D) of the intermediate tip.
3. A device according to Claim 1, characterised in that the driving plate (24) can be withdrawn in the direction of the tool headstock (25) so as to permit the introduction of the moulding blank (18) into the hollow tip (28).
4. The use of the device according to Claims 1 to 3 in such a way that the moulding blank (18) is inserted into the hollow tip (28) in such a way that one part (4; 10) thereof passes through said tip and it is supported by said tip on the rest (8), so that in one or more grinding stages both the part (3) located between the driving plate (24) and the hollow tip (2) and also the part (4; 10) of the moulding blank (18) passing through the hollow tip (28) can be ground without re-chucking said moulding blank in the grinding machine.
EP87904379A 1986-07-21 1987-07-17 Process and device for grinding moulding blanks to size Expired - Lifetime EP0274497B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87904379T ATE62168T1 (en) 1986-07-21 1987-07-17 METHOD AND DEVICE FOR GRINDING BLANKS TO MEASUREMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2912/86A CH670788A5 (en) 1986-07-21 1986-07-21
CH2912/86 1986-07-21

Publications (2)

Publication Number Publication Date
EP0274497A1 EP0274497A1 (en) 1988-07-20
EP0274497B1 true EP0274497B1 (en) 1991-04-03

Family

ID=4244412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87904379A Expired - Lifetime EP0274497B1 (en) 1986-07-21 1987-07-17 Process and device for grinding moulding blanks to size

Country Status (5)

Country Link
US (1) US4827673A (en)
EP (1) EP0274497B1 (en)
JP (1) JPH01500980A (en)
CH (1) CH670788A5 (en)
WO (1) WO1988000512A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010004341A1 (en) * 2010-01-11 2011-07-21 JÄGER-Engineering GmbH, 78126 Method for processing rod or pipe material or inserts for producing rotationally symmetrical workpieces

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733308A1 (en) * 1987-10-02 1989-04-13 Buderus Kundenguss GRINDING BODY
JPH0890408A (en) * 1994-09-27 1996-04-09 Toyoda Mach Works Ltd Grinding method
US7008294B2 (en) * 2002-07-17 2006-03-07 Erwin Junker Maschinenfabrik Gmbh Method and device for grinding a rotating roller using an elastic steady-rest support
EP1561140A1 (en) * 2002-11-11 2005-08-10 Cube Optics AG Support element for mounting optical elements and method for production of such a support element
JP6445257B2 (en) * 2014-06-04 2018-12-26 Ntn株式会社 Cylindrical workpiece machining method and machining apparatus
JP2016101664A (en) * 2014-11-27 2016-06-02 三星ダイヤモンド工業株式会社 Method for manufacturing substrate processing tool and substrate processing tool

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Publication number Priority date Publication date Assignee Title
US2617322A (en) * 1947-10-30 1952-11-11 Herman E Malear Turret lathe attachment
DE1284867B (en) * 1965-03-02 1968-12-05 Mso Maschinen U Schleifmittelw Universal grinding machine with turret head
US3760662A (en) * 1971-08-20 1973-09-25 I Brock Tool holder adaptor
CH622204A5 (en) * 1978-07-06 1981-03-31 Sidco Sa
JPS55101369A (en) * 1979-01-30 1980-08-02 Toyoda Mach Works Ltd Sizing device corrected at measuring position responsive to boring diameter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010004341A1 (en) * 2010-01-11 2011-07-21 JÄGER-Engineering GmbH, 78126 Method for processing rod or pipe material or inserts for producing rotationally symmetrical workpieces
DE102010004341B4 (en) * 2010-01-11 2012-03-01 JÄGER-Engineering GmbH Method for processing rod or pipe material or inserts for producing rotationally symmetrical workpieces

Also Published As

Publication number Publication date
JPH01500980A (en) 1989-04-06
US4827673A (en) 1989-05-09
CH670788A5 (en) 1989-07-14
WO1988000512A1 (en) 1988-01-28
EP0274497A1 (en) 1988-07-20

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