EP0281025B1 - Device for grinding cutting tools with straight or helical groove - Google Patents

Device for grinding cutting tools with straight or helical groove Download PDF

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Publication number
EP0281025B1
EP0281025B1 EP88102877A EP88102877A EP0281025B1 EP 0281025 B1 EP0281025 B1 EP 0281025B1 EP 88102877 A EP88102877 A EP 88102877A EP 88102877 A EP88102877 A EP 88102877A EP 0281025 B1 EP0281025 B1 EP 0281025B1
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EP
European Patent Office
Prior art keywords
spindle
actuating device
tool spindle
contact
roller
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Expired - Lifetime
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EP88102877A
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German (de)
French (fr)
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EP0281025A1 (en
Inventor
Volker Zang
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Individual
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Individual
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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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/04—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for fluting drill shanks
    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • 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
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto

Definitions

  • the invention relates to a device for grinding straight and helically grooved cutting tools according to the preamble of claim 1, as e.g. is known from US-A-2503926.
  • Such a device to be used in conjunction with conventional tool grinding machines has a spindle which is mounted so as to be free of play and can be rotated back and forth to accommodate the tool to be ground, the pitch of which is necessary for generating the feed of the tool during grinding via the change in the angle of attack with the Spindle is set non-positively connected roller; see. DE-PS 32 32 689.
  • a tool with several helical cutting edges e.g. a milling cutter
  • the spindle for grinding the other cutting edges in their respective angular position with respect to the first cutting edge, corresponding to a cutting edge on the longitudinal axis Zero plane to be rotated by certain degrees; see.
  • US Pat. No. 2,503,926 it is necessary to release the non-positive connection between the spindle and the roller and, with the aid of the locking device working as an indexing device, to transfer the spindle into the new angular position in which the spindle passes through the locking device is fixed radially and axially.
  • the roll is placed on the spindle for the subsequent grinding of the new tool cutting edge and released after the attachment of the locking device. Since the locking device there is a cam disc firmly connected to the spindle with four equally spaced projections, which is associated with a fixed cam on the spindle bearing housing, the spindle can assume any position within 60 ° in the circumferential direction and is the axial position of the extent of the axial extent of the projections within the indexed position is undetermined.
  • the invention has for its object to simplify the known device in such a constructive and operational manner that while maintaining the backlash faster and safer than before, the adjustment of the spindle can be carried out according to the division of the cutting edges of the tool to be ground and operating errors are almost impossible.
  • the inventive design of the device avoids the influence of the manual skill of the operator on the grinding result.
  • the first actuating device is de-energized, so that the roller determining the pitch of the spindle is automatically lifted off the spindle. This simplifies the setting of the released spindle in the new angular position and prevents the surfaces of the spindle and the roller from being damaged during adjustment and the working accuracy being reduced as a result.
  • the second actuating device For indexing, only the second actuating device has to be closed with the help of the work contact designed as a pulse switch, so that the indexing pin of the locking device is moved into its angular position.
  • the indexing pin engages in the indexing disc and, due to the formation of the centering hole on the circumference of the indexing disc, moves the indexing disc and thus the associated spindle in the axial direction into the locking position, whereby the previously open quiescent current contact of the first actuating device is closed again.
  • the first actuating device is thereby switched on again and moves the roller in contact with the spindle.
  • the pulse switch can be released, so that the second actuation device is de-energized and the indexing pin resumes its rest position.
  • the spindle can now be moved again for the grinding process.
  • Another advantage is the fact that the contact pressure between the roller and the spindle can be regulated in a simple manner.
  • a two-part guide bushing 5 and 6 for one over a ball cage 7, 8 back and forth Spindle 14 rotatably mounted, receiving a workpiece or tool.
  • a roller 16 engages with its outer lateral surface 15 in the position shown in FIG. 1, which is rotatably supported by a bearing pin 17 in a bearing fork 18 which is mounted in the housing 4 by means of a ball bearing 20 up and down and rotatably.
  • a free space 9 is provided between the mutually facing guide bushes 5 and 6.
  • the bearing fork 18 is arranged in a recess 19 in the housing 4 and has a cylindrical extension 21 which is fixedly connected in the radial direction to an adjusting disk 22 having a graduation and resting on the housing.
  • the setting disk 22 fixed via the locking member 32 is connected via a pressure piece 21a and a spring plate membrane disk 21b to the cylindrical extension 21 of the bearing fork 18 so that an axial movement for lifting the roller 16 from the outer surface 15 of the spindle 14 is possible without that the set helix angle is changed.
  • a cylindrical bearing 21 is assigned a thrust bearing 25, which is acted upon by a pressure plate 26 acting as a switching element, which is arranged in a further recess 28 of the housing 4, which projects above the recess 19 mentioned above.
  • the recess 28 is followed by a further recess 29, which is also larger than the recess 28 and which receives an end plate 30 on which a locking member 32 is adjustably arranged.
  • the recesses 19, 28 and 29 form a stepped recess in the diameter of the housing 4, which extends to the guide bushes 5 and 6.
  • the housing 4 With the pressure plate 26 are four spaced apart, outside the area of the guide bushings 5 and 6 the housing 4 arranged through holes penetrating studs 35 which are screwed at their opposite ends to an anchor plate 36 which forms part of a first actuating device B1 and is assigned to an electromagnet M1.
  • the actuating device B 1 is arranged in a recess 38 of the housing 4 and is closed off from the outside by a cover plate 39 which is flush with the housing.
  • springs 43 In the blind bores 41 arranged coaxially to the stud bolts 35, springs 43 are arranged which endeavor to move the pressure plate 26 upward in relation to FIG. 1 to the extent of the gap of approx. 2 mm provided for this purpose.
  • the required helix angle of the workpiece can be found in a table.
  • the pitch of the workpiece in mm / rev corresponds to a certain setting angle of the setting disk 22.
  • the required angular position of the setting disk 22 for an existing spiral pitch on the workpiece can also be set directly using a dial gauge.
  • a bearing plate 50 which is coaxial with the spindle 14, is rotatably mounted on the right-hand end side of the housing 4 with reference to FIG. 1 and can be locked in the respective setting position with the aid of an adjusting screw 52 engaging in a semi-annular slot 51.
  • a locking device 53 assigned to the spindle 14 is fixedly connected to the bearing plate and supports an indexing pin 54 in radial alignment with the spindle 14, said indexing pin 54 being held in its rest position by a spring 55.
  • the indexing pin 54 is then with its tapered tip 56 out of engagement with an index disk 58 which is fixedly connected to the spindle 14 and has frustoconical recesses 59 which are arranged regularly distributed around its circumference.
  • the locking device 53 is also associated with an actuating device B2, which also has an electromagnet M2 which, when excited via a switching element 60, moves the indexing pin 54 against the action of the spring 55 into the operative position shown in FIG. 1, in which its tip 56 moves into a of the recesses 59 engages and locks the spindle 14 against rotational and axial movements, as shown in FIG. 1.
  • This position is the so-called grinding starting position, in which a bearing flange 57 of the spindle 14, on which the index disk 58 is arranged, is at a predetermined distance from the end face of the bearing plate 50, which in the present exemplary embodiment is approximately 2 mm.
  • the spindle 14 can be moved to the right by approximately 128 mm in the axial direction, so that the total axial freedom of movement of the spindle 14 in the housing 4 is 130 mm.
  • a quiescent current contact K1 is also arranged, which is opened by an actuating pin 63 can be when the spindle 14 is in its outermost position in relation to FIG. 2, in which the actuating pin 63 of the closed-circuit current contact K 1 is open via the index disk 58.
  • the quiescent current contact K1 is part of a circuit shown in Figure 2 with a power supply source Q, a potentiometer P1, the excitation coil M1 of the actuator B1, the coil M2 of the actuator B2 and the other switching contacts K2, K3, K4 and K5.
  • the switch contact K2 is designed as a switch, which in the first switching position is formed as a spring switch in the open position, the switch contact K3 is connected in series, while in the second switching position of the switch K2, not shown in Figure 2, the Pulse switch K3 is bridged.
  • the closed-circuit current contact K 1 can be bridged via the switch contact K 1, to which the switch contact K 1 is connected in series. Via the switching contacts K4 and K5, the function of the closed-circuit current contact K1 can be bridged. About the potentiometer P1, the excitation current of the magnet M1 of the actuator B1 and thus the contact pressure of the roller 16 on the outer surface 15 of the spindle 14 can be changed.
  • the device works as follows:
  • the setting angle of the roller 16 and thus the helix pitch of the spindle 14 can be adjusted via the adjusting plate 22, specifically in accordance with the helix angle of the tool cutting edges of the tool to be ground, not shown in FIG. 1, to be inserted into the cone 65 of the spindle Tool.
  • the helix angle of the tool is only identical if the shaft and workpiece have the same diameter.
  • the locking member 32 is to be rendered ineffective, while after the setting thereof is moved back into its position blocking the setting plate 22.
  • the helix angle is set with the actuating device B 1 switched on.
  • the spindle 14 In order to bring the workpiece cutting edges into a new angular position with respect to the grinding wheel by means of the indexing disk 58, the spindle 14 is to be moved from the starting starting position shown in FIG Index disc 58 and the actuating pin 63 is opened. Due to the closed current contact moved into the open position, the first actuating device B 1 is de-energized so that the roller determining the pitch of the spindle is lifted off the spindle via the springs 43. This releases the setting of the released spindle in the new angular position and at the same time prevents the surfaces of the spindle and roller from being damaged.
  • the second actuating device B2 With the help of the work contact designed as a pulse switch K3 to close, so that the indexing pin 54 of the locking device against the action of the spring 55 in its action is moved.
  • the indexing pin engages in the selected recess 59 arranged on the circumference of the indexing disc and moves the indexing disc and thus the associated disc as a result of the formation of the centering hole on the circumference of the indexing disc Spindle 14 in the axial direction in the locking position - namely in the starting position shown in Figure 1 - whereby the previously open quiescent current contact of the first actuating device is closed again.
  • the actuating device B1 is thereby switched on again and moves the roller over the switching elements described above until it comes into contact with the spindle.
  • the pulse switch can be released, so that the second actuator B2 is de-energized and the indexing pin 54 resumes its rest position via the spring 55.
  • the spindle 14 can now be moved again in the axial direction for a further grinding operation, with the lowered roller 16 simultaneously forcing it to perform a rotational movement corresponding to the set angle of inclination of the roller 16.
  • the adjustment of the spindle is therefore simple and easy and without fatigue.
  • the contact pressure between the roller and the spindle can be regulated in a simple manner by adjusting the potentiometer P 1.

Abstract

The device has a work or tool spindle (14) which is rotatable in a housing (4), can be set manually in a combined feed and rotary movement which is determined by a roller (16) engaging on its circumferential surface (15) and rotationally adjustable about an axis running in the radial direction relative to the spindle, and has an adjusting device (58) for adjusting the respective angular position of the spindle, in which arrangement the roller, in the direction of its adjusting axis, is held frictionally in contact with the spindle relative to a spring force via a first electromagnetic actuating device (B1) and can be tripped as a function of the axial feed position of the spindle, and the adjusting device for the angular position of the spindle is a second electromagnetic actuating device (B2) which is held in a spring-loaded manner in a position releasing the spindle, can be tripped manually and can be moved into a position locking the spindle. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Schleifen von gerad- und wendelgenuteten Schneidwerkzeugen gemäß dem Oberbegriff des Patentanspruches 1, wie sie z.B. aus der US-A-2503926 bekannt ist.The invention relates to a device for grinding straight and helically grooved cutting tools according to the preamble of claim 1, as e.g. is known from US-A-2503926.

Eine solche in Verbindung mit herkömmlichen Werkzeugschleifmaschinen zu verwendende Vorrichtung weist zur Aufnahme des zu schleifenden Werkzeuges eine spielfrei dreh- und hin- und herbeweglich gelagerte Spindel auf, deren für die Erzeugung des Vorschubes des Werkzeuges beim Schleifen notwendige Steigung über die Änderung des Anstellwinkels der mit der Spindel kraftschlüssig in Verbindung gehaltenen Rolle eingestellt wird; vgl. DE-PS 32 32 689.Such a device to be used in conjunction with conventional tool grinding machines has a spindle which is mounted so as to be free of play and can be rotated back and forth to accommodate the tool to be ground, the pitch of which is necessary for generating the feed of the tool during grinding via the change in the angle of attack with the Spindle is set non-positively connected roller; see. DE-PS 32 32 689.

Ist ein Werkzeug mit mehreren wendelförmigen Schneiden, z.B. ein Walzenfräser, zu schleifen, so muß nach dem Schleifen der ersten Werkzeugschneide entsprechend der Teilung die Spindel für das Schleifen der weiteren Werkzeugschneiden in ihrer jeweiligen Winkellage in bezug auf die erste Werkzeugschneide, entsprechend einer die Längsachse schneidenden Null-Ebene, um bestimmte Winkelgrade verdreht werden; vgl. z.B. US-PS 2 503 926. Hierzu ist es notwendig, die kraftschlüssige Verbindung zwischen Spindel und Rolle zu lösen und mit Hilfe der als Indexier-Vorrichtung arbeitenden Arretiervorrichtung die Spindel in die neue Winkellage zu überführen, in der die Spindel durch die Arretier-Vorrichtung radial und axial fixiert wird. Für das nachfolgende Schleifen der neuen Werkzeugschneide wird die Rolle auf die Spindel aufgesetzt und nach dem Aufsetzen die Arretiervorrichtung gelöst. Da die Arretiervorrichtung dort eine mit der Spindel fest verbundene Nockenscheibe mit vier im gleichen Abstand voneinander angeordneten Vorsprüngen ist, der ein fester Nocken an dem die Spindel lagernden Gehäuse zugeordnet ist, kann die Spindel in Umfangsrichtung gesehen jede beliebige Stellung innerhalb von 60° einnehmen und ist deren axiale Lage im Ausmaße der axialen Erstreckung der genannten Vorsprünge innerhalb der indexierten Lage unbestimmt.If a tool with several helical cutting edges, e.g. a milling cutter, is to be ground, then after grinding the first cutting edge in accordance with the division, the spindle for grinding the other cutting edges in their respective angular position with respect to the first cutting edge, corresponding to a cutting edge on the longitudinal axis Zero plane to be rotated by certain degrees; see. For example, US Pat. No. 2,503,926. For this purpose, it is necessary to release the non-positive connection between the spindle and the roller and, with the aid of the locking device working as an indexing device, to transfer the spindle into the new angular position in which the spindle passes through the locking device is fixed radially and axially. The roll is placed on the spindle for the subsequent grinding of the new tool cutting edge and released after the attachment of the locking device. Since the locking device there is a cam disc firmly connected to the spindle with four equally spaced projections, which is associated with a fixed cam on the spindle bearing housing, the spindle can assume any position within 60 ° in the circumferential direction and is the axial position of the extent of the axial extent of the projections within the indexed position is undetermined.

Die Genauigkeit, mit der ein Werkzeug unter Benutzung der bekannten Vorrichtung geschliffen werden kann, hängt also allein von der manuellen Gechicklichkeit der Bedienungsperson ab, ganz abgesehen von der Tatsache, daß infolge dieser Ausbildung im erheblichen Umfang unerwünschte Teilungsfehler am zu schleifenden Werkzeug entstehen.The accuracy with which a tool can be ground using the known device depends solely on the manual skill of the operator, quite apart from the fact that undesirable pitch errors occur on the tool to be ground as a result of this training.

Da dort ferner getrennte, konstruktiv aufwendige Handhabungsvorrichtungen vorgesehen sind, erfordert dies eine zeitraubende Einstellarbeit, die zu weiteren Einstellfehlern führt, deren Korrektur ebenfalls Zeit erfordert.Since there are also separate, structurally complex handling devices, this requires time-consuming adjustment work, which leads to further adjustment errors, the correction of which also takes time.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Vorrichtung derart konstruktiv und bedienungstechnisch zu vereinfachen, daß unter Wahrung der Spielfreiheit schneller und sicherer als bisher die Einstellung der Spindel entsprechend der Teilung der Schneiden des zu schleifenden Werkzeuges durchführbar ist und Bedienungsfehler nahezu ausgeschlossen sind.The invention has for its object to simplify the known device in such a constructive and operational manner that while maintaining the backlash faster and safer than before, the adjustment of the spindle can be carried out according to the division of the cutting edges of the tool to be ground and operating errors are almost impossible.

Diese Aufgabe ist erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Weitere Merkmale bevorzugter Ausführungsformen der Erfindung ergeben sich aus den Unteransprüchen.Further features of preferred embodiments of the invention result from the subclaims.

Die erfindungsgemäße Ausbildung der Vorrichtung vermeidet den Einfluß der manuellen Geschicklichkeit der Bedienungsperson auf das Schleifergebnis.The inventive design of the device avoids the influence of the manual skill of the operator on the grinding result.

Infolge des in der Schleifausgangsstellung der Spindel in die Offenstellung bewegten Ruhestromkontaktes wird die erste Betätigungsvorrichtung stromlos, so daß die die Steigung der Spindel bestimmende Rolle von der Spindel automatisch abgehoben wird. Damit wird das Einstellen der freigegebenen Spindel in die neue Winkellage vereinfacht und verhindert, daß beim Einstellen die Oberflächen von Spindel und Rolle beschädigt werden und daraus resultierend die Arbeitsgenauigkeit verringert wird.As a result of the closed-circuit current contact moved into the open position in the starting grinding position of the spindle, the first actuating device is de-energized, so that the roller determining the pitch of the spindle is automatically lifted off the spindle. This simplifies the setting of the released spindle in the new angular position and prevents the surfaces of the spindle and the roller from being damaged during adjustment and the working accuracy being reduced as a result.

Für das Indexieren ist lediglich die zweite Betätigungsvorrichtung mit Hilfe des als Impulsschalter ausgebildeten Arbeitskontaktes zu schließen, so daß der Indexierstift der Arretiervorrichtung in seine Winkellage bewegt wird. Beim Erreichen der neuen, durch eine auf der Spindel befindliche Teilscheibe bestimmten Winkellage rastet der Indexierstift in der Teilscheibe ein und bewegt dabei infolge der Ausbildung der auf dem Umfang der Teilscheibe vorhandenen Zentrierbohrung die Teilscheibe und damit die damit verbundene Spindel in axialer Richtung in die Arretierlage, wodurch der bisher geöffnete Ruhestromkontakt der ersten Betätigungsvorrichtung wieder geschlossen wird. Die erste Betätigungsvorrichtung wird dadurch wieder eingeschaltet und bewegt die Rolle in Anlage mit der Spindel. Nunmehr kann der Impulsschalter wieder losgelassen werden, so daß die zweite Betätigungsvorrichtung stromlos wird und der Indexierstift seine Ruhelage wieder einnimmt. Die Spindel kann nunmehr für den Schleifvorgang erneut bewegt werden.For indexing, only the second actuating device has to be closed with the help of the work contact designed as a pulse switch, so that the indexing pin of the locking device is moved into its angular position. At the Reaching the new angular position determined by a indexing disc located on the spindle, the indexing pin engages in the indexing disc and, due to the formation of the centering hole on the circumference of the indexing disc, moves the indexing disc and thus the associated spindle in the axial direction into the locking position, whereby the previously open quiescent current contact of the first actuating device is closed again. The first actuating device is thereby switched on again and moves the roller in contact with the spindle. Now the pulse switch can be released, so that the second actuation device is de-energized and the indexing pin resumes its rest position. The spindle can now be moved again for the grinding process.

Das Einstellen der Spindel ist somit bedeutend erleichtert und ermüdungsfrei möglich.Adjusting the spindle is therefore significantly easier and fatigue-free.

Ein weiterer Vorteil ist darin zu sehen, daß der Anpreßdruck zwischen Rolle und Spindel auf einfache Weise regelbar ist.Another advantage is the fact that the contact pressure between the roller and the spindle can be regulated in a simple manner.

Ein Ausführungsbeispiel der Erfindung ist nachfolgend anhand der Zeichnung beschrieben.An embodiment of the invention is described below with reference to the drawing.

Es zeigen:

Figur 1
einen Schnitt durch eine Vorrichtung zum Schleifen gerad- und wendelgenuteter Schneidwerkzeuge gemäß der Erfindung und
Figur 2
einen Stromlaufplan der Betätigungsvorrichtungen der Vorrichtung nach Figur 1.
Show it:
Figure 1
a section through a device for grinding straight and helical grooved cutting tools according to the invention and
Figure 2
a circuit diagram of the actuators of the device of Figure 1.

In einem Gehäuse 4 ist eine zweiteilige Führungsbuchse 5 und 6 für eine über je einen Kugelkäfig 7, 8 hin- und her- und drehbeweglich gelagerte, ein Werkstück bzw. Werkzeug aufnehmende Spindel 14 gelagert. Mit ihrer Außenmantelfläche 15 ist in der in Figur 1 dargestellten Lage eine Rolle 16 in Eingriff, die über einen Lagerbolzen 17 in einer Lagergabel 18 drehbar gelagert ist, welche im Gehäuse 4 mittels einer Kugellagerung 20 auf- und ab- sowie drehbeweglich gelagert ist. Hierzu ist ein Freiraum 9 zwischen den einander zugewandten Führungsbuchsen 5 und 6 vorgesehen.In a housing 4 is a two-part guide bushing 5 and 6 for one over a ball cage 7, 8 back and forth Spindle 14 rotatably mounted, receiving a workpiece or tool. A roller 16 engages with its outer lateral surface 15 in the position shown in FIG. 1, which is rotatably supported by a bearing pin 17 in a bearing fork 18 which is mounted in the housing 4 by means of a ball bearing 20 up and down and rotatably. For this purpose, a free space 9 is provided between the mutually facing guide bushes 5 and 6.

Die Lagergabel 18 ist in einer Ausnehmung 19 im Gehäuse 4 angeordnet und weist einen zylindrischen Fortsatz 21 auf, der mit einer eine Gradteilung aufweisenden, auf dem Gehäuse aufliegenden Einstellscheibe 22 in radialer Richtung fest verbunden ist. Die über das Feststellglied 32 fixierte Einstellscheibe 22 ist über ein Druckstück 21a und eine Federblech-Membranscheibe 21b mit dem zylindrischen Fortsatz 21 der Lagergabel 18 so verbunden, daß eine axiale Bewegung zum Abheben der Rolle 16 von der Außenmantelfläche 15 der Spindel 14 möglich ist, ohne daß dabei der eingestellte Wendelwinkel verändert wird. Dem zylindrischen Ansatz 21 ist ein Drucklager 25 zugeordnet, das von einer als Schaltglied wirkenden Druckplatte 26 beaufschlagt ist, die in einer weiteren Ausnehmung 28 des Gehäuses 4 angeordnet ist, welche die oben genannte Ausnehmung 19 überragt. An die Ausnehmung 28 schließt sich eine weitere Ausnehmung 29 an, die ebenfalls größer als die Ausnehmung 28 ist und die eine Abschlußplatte 30 aufnimmt, auf der ein Feststellglied 32 einstellbar angeordnet ist. Die Ausnehmungen 19, 28 und 29 bilden eine in ihren Durchmessern gestufte Ausnehmung im Gehäuse 4, die bis zu den Führungsbüchsen 5 und 6 sich erstreckt.The bearing fork 18 is arranged in a recess 19 in the housing 4 and has a cylindrical extension 21 which is fixedly connected in the radial direction to an adjusting disk 22 having a graduation and resting on the housing. The setting disk 22 fixed via the locking member 32 is connected via a pressure piece 21a and a spring plate membrane disk 21b to the cylindrical extension 21 of the bearing fork 18 so that an axial movement for lifting the roller 16 from the outer surface 15 of the spindle 14 is possible without that the set helix angle is changed. A cylindrical bearing 21 is assigned a thrust bearing 25, which is acted upon by a pressure plate 26 acting as a switching element, which is arranged in a further recess 28 of the housing 4, which projects above the recess 19 mentioned above. The recess 28 is followed by a further recess 29, which is also larger than the recess 28 and which receives an end plate 30 on which a locking member 32 is adjustably arranged. The recesses 19, 28 and 29 form a stepped recess in the diameter of the housing 4, which extends to the guide bushes 5 and 6.

Mit der Druckplatte 26 sind vier im Abstand zueinander angeordnete, außerhalb des Bereiches der Führungsbüchsen 5 und 6 das Gehäuse 4 über Bohrungen durchdringende Stehbolzen 35 angeordnet, die an ihren abgewandten Enden mit einer Ankerplatte 36 verschraubt sind, die Teil einer ersten Betätigungsvorrichtung B₁ bildet und einem Elektromagneten M₁ zugeordnet ist. Die Betätigungsvorrichtung B₁ ist in einer Ausnehmung 38 des Gehäuses 4 angeordnet und von einer mit dem Gehäuse bündig abschließenden Abdeckplatte 39 nach außen hin abgeschlossen. In koaxial zu den Stehbolzen 35 angeordneten Sackbohrungen 41 sind Federn 43 angeordnet, die das Bestreben haben, die Druckplatte 26 in bezug auf Figur 1 nach oben zu bewegen im Ausmaße des konstruktiv hierfür vorgesehenen Spaltes von ca. 2 mm. Im unerregten Zustand des der Betätigungsvorrichtung B₁ zugeordneten Elektromagneten M₁ ist die Druckplatte 26 von der Lagergabel 18 abgehoben und somit die Rolle 16 ohne jeden Anpreßdruck in bezug auf die Außenmantelfläche 15 der Spindel 14. Die Rolle 16 wird nach Lösen des Feststellgliedes 22 bei erregtem Zustand des der Betätigungsvorrichtung B₁ zugeordneten Elektromagneten M₁ auf den erforderlichen Wendelwinkel des Werkstücks eingestellt. Die jeweilige Einstellung kann dann über das Feststellglied 32 fixiert werden.With the pressure plate 26 are four spaced apart, outside the area of the guide bushings 5 and 6 the housing 4 arranged through holes penetrating studs 35 which are screwed at their opposite ends to an anchor plate 36 which forms part of a first actuating device B₁ and is assigned to an electromagnet M₁. The actuating device B 1 is arranged in a recess 38 of the housing 4 and is closed off from the outside by a cover plate 39 which is flush with the housing. In the blind bores 41 arranged coaxially to the stud bolts 35, springs 43 are arranged which endeavor to move the pressure plate 26 upward in relation to FIG. 1 to the extent of the gap of approx. 2 mm provided for this purpose. In the de-energized state of the actuating device B₁ associated M₁ the pressure plate 26 is lifted from the bearing fork 18 and thus the roller 16 without any contact pressure with respect to the outer surface 15 of the spindle 14. The roller 16 is after releasing the locking member 22 when the state of excitation the actuator B₁ associated electromagnet M₁ set to the required helix angle of the workpiece. The respective setting can then be fixed via the locking member 32.

Der erforderliche Wendelwinkel des Werkstückes kann einer Tabelle entnommen werden. Die Steigung des Werkstücks in mm/U entspricht einem gewissen Einstellwinkel der Einstellscheibe 22. Die erforderliche Winkelstellung der Einstellscheibe 22 für eine vorhandene Wendelsteigung am Werkstück kann auch direkt über eine Meßuhr eingestellt werden.The required helix angle of the workpiece can be found in a table. The pitch of the workpiece in mm / rev corresponds to a certain setting angle of the setting disk 22. The required angular position of the setting disk 22 for an existing spiral pitch on the workpiece can also be set directly using a dial gauge.

Ist der Elektromagnet M₁ der Betätigungsvorrichtung B₁ erregt, so zieht dieser über seine Ankerplatte 36 und die Stehbolzen 35 die Druckplatte 26 gegen das Drucklager 25 und damit gegen die Lagergabel 18, wodurch die Rolle entsprechend der jeweiligen Haltekraft des Elektromagneten mit entsprechendem Anpreßdruck an die Außenmantelfläche 15 der Spindel 14 gedrückt wird.If the electromagnet M 1 of the actuating device B 1 is excited, this pulls over its anchor plate 36 and the stud bolts 35 the pressure plate 26 against the thrust bearing 25 and thus against the bearing fork 18, whereby the roller corresponding to the respective holding force of the electromagnet is pressed against the outer lateral surface 15 of the spindle 14 with a corresponding contact pressure.

An der in bezug auf Figur 1 rechten Stirnseite des Gehäuses 4 ist eine zur Spindel 14 koaxiale Lagerplatte 50 drehbeweglich gelagert und mit Hilfe einer in einer halbringförmigen Schlitz 51 eingreifenden Stellschraube 52 in der jeweiligen Einstellage feststellbar. Mit der Lagerplatte ist eine der Spindel 14 zugeordnete Arretiervorrichtung 53 fest verbunden, die in radialer Ausrichtung zur Spindel 14 einen Indexierstift 54 auf- und abbeweglich gelagert trägt, der von einer Feder 55 in seiner Ruhelage gehalten ist. Der Indexierstift 54 ist dann mit seiner kegeligen Spitze 56 außer Eingriff mit einer mit der Spindel 14 fest verbundenen Indexscheibe 58, die an ihrem Umfang regelmäßig verteilt angeordnete kegelstumpfförmige Ausnehmungen 59 aufweist. Der Arretiervorrichtung 53 ist ferner eine Betätigungsvorrichtung B₂ zugeordnet, die ebenfalls einen Elektromagneten M₂ aufweist, der bei seiner Erregung über ein Schaltglied 60 den Indexierstift 54 entgegen der Wirkung der Feder 55 in die in Figur 1 dargestellte Wirklage bewegt, in der seine Spitze 56 in eine der Ausnehmungen 59 eingreift und dabei die Spindel 14 gegen Dreh- und axiale Bewegungen arretiert, so wie es in Figur 1 dargestellt ist. Diese Lage ist die sogenannte Schleifausgangsstellung, in der ein Lagerflansch 57 der Spindel 14, auf dem die Indexscheibe 58 angeordnet ist, von der Stirnseite der Lagerplatte 50 einen vorbestimmten Abstand aufweist, der im vorliegenden Ausführungsbeispiel ca. 2mm beträgt. Die Spindel 14 ist gegenüber der in Figur 1 dargestellten Lage nach rechts um ca. 128 mm in axialer Richtung bewegbar, so daß die gesamte axiale Bewegungsfreiheit der Spindel 14 im Gehäuse 4 130mm beträgt.A bearing plate 50, which is coaxial with the spindle 14, is rotatably mounted on the right-hand end side of the housing 4 with reference to FIG. 1 and can be locked in the respective setting position with the aid of an adjusting screw 52 engaging in a semi-annular slot 51. A locking device 53 assigned to the spindle 14 is fixedly connected to the bearing plate and supports an indexing pin 54 in radial alignment with the spindle 14, said indexing pin 54 being held in its rest position by a spring 55. The indexing pin 54 is then with its tapered tip 56 out of engagement with an index disk 58 which is fixedly connected to the spindle 14 and has frustoconical recesses 59 which are arranged regularly distributed around its circumference. The locking device 53 is also associated with an actuating device B₂, which also has an electromagnet M₂ which, when excited via a switching element 60, moves the indexing pin 54 against the action of the spring 55 into the operative position shown in FIG. 1, in which its tip 56 moves into a of the recesses 59 engages and locks the spindle 14 against rotational and axial movements, as shown in FIG. 1. This position is the so-called grinding starting position, in which a bearing flange 57 of the spindle 14, on which the index disk 58 is arranged, is at a predetermined distance from the end face of the bearing plate 50, which in the present exemplary embodiment is approximately 2 mm. Compared to the position shown in FIG. 1, the spindle 14 can be moved to the right by approximately 128 mm in the axial direction, so that the total axial freedom of movement of the spindle 14 in the housing 4 is 130 mm.

In der Lagerplatte 50 ist ferner ein Ruhestromkontakt K₁ angeordnet, der von einem Betätigungsstift 63 geöffnet werden kann, wenn die Spindel 14 in ihrer äußersten in bezug auf Figur 2 linken Lage befindlich ist, in der über die Indexscheibe 58 der Betätigungsstift 63 der Ruhestromkontakt K₁ geöffnet ist.In the bearing plate 50 a quiescent current contact K₁ is also arranged, which is opened by an actuating pin 63 can be when the spindle 14 is in its outermost position in relation to FIG. 2, in which the actuating pin 63 of the closed-circuit current contact K 1 is open via the index disk 58.

Der Ruhestromkontakt K₁ ist Teil eines in Figur 2 dargestellten Stromkreises mit einer Stromversorgungsquelle Q, einem Potentiometer P₁, der Erregerspule M₁ der Betätigungsvorrichtung B₁, der Spule M₂ der Betätigungsvorrichtung B₂ sowie den weiteren Schaltkontakten K₂, K₃, K₄ und K₅.The quiescent current contact K₁ is part of a circuit shown in Figure 2 with a power supply source Q, a potentiometer P₁, the excitation coil M₁ of the actuator B₁, the coil M₂ of the actuator B₂ and the other switching contacts K₂, K₃, K₄ and K₅.

Wie Figur 2 zu entnehmen ist, ist der Schaltkontakt K₂ als Umschalter ausgebildet, dem in der ersten Schaltstellung der als federnd in der Offenstellung gehaltener Impulsschalter ausgebildete Schaltkontakt K₃ in Reihe geschaltet ist, während in der in Figur 2 nicht dargestellten zweiten Schaltstellung des Umschalters K₂ der Impulsschalter K₃ überbrückt ist.As can be seen in Figure 2, the switch contact K₂ is designed as a switch, which in the first switching position is formed as a spring switch in the open position, the switch contact K₃ is connected in series, while in the second switching position of the switch K₂, not shown in Figure 2, the Pulse switch K₃ is bridged.

Über den Schaltkontakt K₄ kann der Ruhestromkontakt K₁ überbrückt werden, zu dem der Schaltkontakt K₅ in Reihe geschaltet ist. Über die Schaltkontakte K₄ und K₅ kann also die Funktion des Ruhestromkontaktes K₁ überbrückt werden. Über das Potentiometer P₁ kann die Erregerstromstärke des Magneten M₁ der Betätigungsvorrichtung B₁ und damit der Anpreßdruck der Rolle 16 auf die Außenmantelfläche 15 der Spindel 14 verändert werden.The closed-circuit current contact K 1 can be bridged via the switch contact K 1, to which the switch contact K 1 is connected in series. Via the switching contacts K₄ and K₅, the function of the closed-circuit current contact K₁ can be bridged. About the potentiometer P₁, the excitation current of the magnet M₁ of the actuator B₁ and thus the contact pressure of the roller 16 on the outer surface 15 of the spindle 14 can be changed.

Die Wirkungsweise der beschriebenen Vorrichtung ist folgende:
Über die Stellplatte 22 ist der Anstellwinkel der Rolle 16 und damit die Wendelsteigung der Spindel 14 einzustellen, und zwar entsprechend dem Wendelwinkel der Werkzeugschneiden des zu schleifenden, in Figur 1 nicht dargestellten, in den Konus 65 der Spindel einzusteckenden Werkzeuges. Der Wendelwinkel des Werkzeuges ist nur bei gleichem Durchmesser Welle und Werkstück identisch. Für das Einstellen des Wendelwinkels über die Stellplatte 22 ist das Feststellglied 32 unwirksam zu machen, während nach dem Einstellen dieses wieder in seine die Stellplatte 22 sperrende Lage bewegt wird. Der Wendelwinkel wird bei eingeschalteter Betätigungsvorrichtung B₁ eingestellt. Um die Werkstückschneiden mittels der Indexscheibe 58 in eine neue Winkellage zur Schleifscheibe zu bringen, ist die Spindel 14 aus der in Figur 1 dargestellten Schleifausgangslage nach links bis zum Anschlag des Lagerflansches 57 an der Stirnseite der Führungsbüchse 6 zu bewegen, wodurch der Ruhestromkontakt K₁ über die Indexscheibe 58 und den Betätigungsstift 63 geöffnet wird. Durch den in die Offenstellung bewegten Ruhestromkontakt wird die erste Betätigungsvorrichtung B₁ stromlos, so daß die die Steigung der Spindel bestimmende Rolle von der Spindel über die Federn 43 abgehoben wird. Damit wird das Einstellen der freigegebenen Spindel in die neue Winkellage freigegeben und gleichzeitig verhindert, daß die Oberflächen von Spindel und Rolle beschädigt werden.The device works as follows:
The setting angle of the roller 16 and thus the helix pitch of the spindle 14 can be adjusted via the adjusting plate 22, specifically in accordance with the helix angle of the tool cutting edges of the tool to be ground, not shown in FIG. 1, to be inserted into the cone 65 of the spindle Tool. The helix angle of the tool is only identical if the shaft and workpiece have the same diameter. To set the helix angle via the setting plate 22, the locking member 32 is to be rendered ineffective, while after the setting thereof is moved back into its position blocking the setting plate 22. The helix angle is set with the actuating device B 1 switched on. In order to bring the workpiece cutting edges into a new angular position with respect to the grinding wheel by means of the indexing disk 58, the spindle 14 is to be moved from the starting starting position shown in FIG Index disc 58 and the actuating pin 63 is opened. Due to the closed current contact moved into the open position, the first actuating device B 1 is de-energized so that the roller determining the pitch of the spindle is lifted off the spindle via the springs 43. This releases the setting of the released spindle in the new angular position and at the same time prevents the surfaces of the spindle and roller from being damaged.

Für das Indexieren ist also nach der Einstellung der Spindel entsprechend der Teilung des zu schleifenden Werkzeuges in eine neue Winkellage die zweite Betätigungsvorrichtung B₂ mit Hilfe des als Impulsschalter ausgebildeten Arbeitskontaktes K₃ zu schließen, so daß der Indexierstift 54 der Arretiervorrichtung entgegen der Wirkung der Feder 55 in seine Wirklage bewegt wird.For indexing so after the adjustment of the spindle according to the division of the tool to be ground in a new angular position, the second actuating device B₂ with the help of the work contact designed as a pulse switch K₃ to close, so that the indexing pin 54 of the locking device against the action of the spring 55 in its action is moved.

Der Indexierstift rastet beim Erreichen der neuen, durch die auf der Spindel befindliche Teilscheibe bestimmte Winkellage in die am Umfang der Teilscheibe angeordnete ausgewählte Ausnehmung 59 ein und bewegt dabei infolge der Ausbildung der auf dem Umfang der Teilscheibe vorhandenen Zentrierbohrung die Teilscheibe und damit die damit verbundene Spindel 14 in axialer Richtung in die Arretierlage - nämlich in die in Figur 1 dargestellte Schleifausgangslage - wodurch der bisher geöffnete Ruhestromkontakt der ersten Betätigungsvorrichtung wieder geschlossen wird. Die Betätigungsvorrichtung B₁ wird dadurch wieder eingeschaltet und bewegt die Rolle über die eingangs beschriebenen Schaltglieder, bis diese in Anlage mit der Spindel gelangt. Nunmehr kann der Impulsschalter wieder losgelassen werden, so daß die zweite Betätigungsvorrichtung B₂ stromlos wird und der Indexierstift 54 über die Feder 55 seine Ruhelage wieder einnimmt. Die Spindel 14 kann nunmehr für einen weiteren Schleifvorgang erneut in axialer Richtung bewegt werden, wobei ihr durch die abgesenkte Rolle 16 gleichzeitig eine Drehbewegung entsprechend dem eingestellten Steigungswinkel der Rolle 16 aufgezwungen wird. Das Einstellen der Spindel ist somit ohne Umgreifen einfach und leicht sowie ermüdungsfrei möglich.When the new indexing position determined by the indexing disc on the spindle is reached, the indexing pin engages in the selected recess 59 arranged on the circumference of the indexing disc and moves the indexing disc and thus the associated disc as a result of the formation of the centering hole on the circumference of the indexing disc Spindle 14 in the axial direction in the locking position - namely in the starting position shown in Figure 1 - whereby the previously open quiescent current contact of the first actuating device is closed again. The actuating device B₁ is thereby switched on again and moves the roller over the switching elements described above until it comes into contact with the spindle. Now the pulse switch can be released, so that the second actuator B₂ is de-energized and the indexing pin 54 resumes its rest position via the spring 55. The spindle 14 can now be moved again in the axial direction for a further grinding operation, with the lowered roller 16 simultaneously forcing it to perform a rotational movement corresponding to the set angle of inclination of the roller 16. The adjustment of the spindle is therefore simple and easy and without fatigue.

Der Anpreßdruck zwischen Rolle und Spindel ist durch Einstellung des Potentiometers P₁ auf einfache Weise regelbar.The contact pressure between the roller and the spindle can be regulated in a simple manner by adjusting the potentiometer P 1.

Claims (7)

  1. Device for grinding straight-fluted and helical-fluted cutting tools, having a workpiece or tool spindle (14) which is rotatable in a housing (4) and can be set manually in a combined rotary and feed movement whose lead can be set by a roller (16) which can be brought into use frictionally on the circumferential surface (15) of the tool spindle, is pivotable about an axis running in the radial direction relative to the tool spindle (14) and is mounted in such a way as to be movable up and down along its adjusting axis (18'), and also a locking device (53) for the angular position of the tool spindle (14) as an initial position for the combined rotary and feed movement, characterised in that the roller (16) is held in contact with the tool spindle (14) against a spring force (springs 43) via a first actuating device (B1) having an electromagnet (M1), in that the locking device (53) determining the initial angular position of the tool spindle (14) is held in a spring-loaded manner (spring 55) in a position releasing the tool spindle and can be moved via a second actuating device (B2) having an electromagnet (M2) into a position axially and radially locking the tool spindle, and in that the first actuating device (B1) is electrically connected to the second actuating device in such a way that it can be switched on only as a function of the locking device (53), which can be tripped by the second actuating device (B2).
  2. Device according to Claim 1, characterised in that a normally closed contact (K1), to be opened by axial movement of the tool spindle (14) into the initial grinding position, is provided for switching off the first electromagnetic actuating device (B1), while the second electromagnetic actuating device (B2), after a normally open contact (K2) is closed, can be switched on via a normally open contact (K3) designed as an impulse contact.
  3. Device according to Claim 2, characterised in that the normally closed contact (K1) can be bridged by means of a normally open contact (K4) and can be switched on and off via a second normally open contact (K5) connected in series.
  4. Device according to Claim 2, characterised in that the holding force of the first actuating device (B1) is adjustable (P1).
  5. Device according to Claim 1, characterised in that the roller (16) is rotatably mounted in a fork (18) mounted in a housing (4) in such a way as to be movable up and down and rotatably movable and is held in the inoperative position by the springs (43) via a thrust plate (26).
  6. Device according to Claim 1, characterised in that the locking device (53) comprises an index plate (58) fastened to the spindle (14) and an index pin (54) which interacts with the index plate, has a tapered point and is held in such a way as to be disengaged by the spring (55) from correspondingly formed recesses (59) in the index plate (58) attached to the tool spindle.
  7. Device according to one or more of the preceding claims, characterised in that the spindle (14) opening the normally closed contact (K1) in the intial grinding position, which normally closed contact (K1) influences the first actuating device (B1), can be moved via the index pin (54) of the second actuating device (B2) during the indexing operation into a position closing the normally closed contact (K1).
EP88102877A 1987-03-04 1988-02-26 Device for grinding cutting tools with straight or helical groove Expired - Lifetime EP0281025B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88102877T ATE66845T1 (en) 1987-03-04 1988-02-26 DEVICE FOR GRINDING STRAIGHT AND SPIRAL CUTTING TOOLS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3706948 1987-03-04
DE19873706948 DE3706948A1 (en) 1987-03-04 1987-03-04 DEVICE FOR GRINDING STRAIGHT- AND SPIRAL-SLOTED CUTTING TOOLS

Publications (2)

Publication Number Publication Date
EP0281025A1 EP0281025A1 (en) 1988-09-07
EP0281025B1 true EP0281025B1 (en) 1991-09-04

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Application Number Title Priority Date Filing Date
EP88102877A Expired - Lifetime EP0281025B1 (en) 1987-03-04 1988-02-26 Device for grinding cutting tools with straight or helical groove

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US (1) US4890419A (en)
EP (1) EP0281025B1 (en)
JP (1) JPH01228763A (en)
AT (1) ATE66845T1 (en)
DE (2) DE3706948A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659260B1 (en) * 1990-03-06 1994-04-15 Touraine Automatismes Indls SHARPENING DEVICE FOR TOOLS WITH STRAIGHT OR HELICAL EDGES PROVIDED WITH A SPINDLE GUIDE.
AUPQ992000A0 (en) * 2000-09-05 2000-09-28 Anca Pty Ltd Grinding of cutting tools with a constant rake angle
CN101804594B (en) * 2010-05-07 2013-05-01 台州北平机床有限公司 Grinding device for cutter slot
CN113857956A (en) * 2021-09-26 2021-12-31 宇环数控机床股份有限公司 Grinding head structure of double-end-face grinding machine
CN114603406B (en) * 2022-05-16 2022-07-08 山东鼎驰木业集团有限公司 Automatic cutter grinding machine for wood board processing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355616A (en) * 1918-06-08 1920-10-12 Western Electric Co Feeding-head
US2325364A (en) * 1942-11-23 1943-07-27 Joseph W Boening Cutter feeding device
US2503926A (en) * 1945-04-28 1950-04-11 Raymond T Moloney Spiral grinding machine
FR975020A (en) * 1948-09-20 1951-02-28 Horstmann Ets Method and device for rectifying the flutes of a drill, for performing the relief thereof or for sharpening a tap or the like
US3039244A (en) * 1961-03-06 1962-06-19 Wynn S Vickerman Tool grinding fixture
US3600860A (en) * 1969-07-14 1971-08-24 Warren Harding Liepold Adjustable angle helix generator for edge and radial relief sharpening
DE3232689C2 (en) * 1982-09-02 1985-10-24 Volker 8044 Lohhof Zang Device for grinding straight and helically grooved cutting tools
JPS61146457A (en) * 1984-12-19 1986-07-04 Toshiaki Hosoi Drill cutting edge grinding attachment

Also Published As

Publication number Publication date
JPH01228763A (en) 1989-09-12
DE3864542D1 (en) 1991-10-10
DE3706948A1 (en) 1988-09-15
JPH0581385B2 (en) 1993-11-12
ATE66845T1 (en) 1991-09-15
US4890419A (en) 1990-01-02
EP0281025A1 (en) 1988-09-07

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