Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
  • B23B31/006—Conical shanks of tools
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
  • B23B31/02—Chucks
  • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
  • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
  • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
  • B23B31/266—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank using a threaded spindle

Definitions

• the invention relates to an attachment flange for a spindle for a drilling, milling or drilling-milling machine tool with a spindle head, in which a conical receiving bore is formed for the tool head to be respectively attached to the spindle and an axially displaceable tightening rod is arranged, the attachment flange is arranged on the end face of the spindle head and the front end of the tension rod can be connected to a tension rod which extends in the same direction as the tension rod and which projects through a coaxial bore of the attachment flange and which corresponding tension elements during an axial movement actuated to attach the respective tool head to the spindle.
• Spindles for machine tools are known and correspond essentially to DIN 2079 (corresponding to IFO 297-1982). They have a spindle head with a steep taper shank, a preferably conical receiving bore for attaching a corresponding tool head being designed to receive the steep taper shank in the spindle head. Furthermore, spindles designed in this way have an axially displaceable tightening rod, which can also be rotatable, if necessary. Such a tightening rod with a tightening thread at the front end corresponds to DIN 6369.
• the attachment flange screwed in front of the spindle head by means of screws has the same clamping device with wedges described above.
• a collet is required to couple the armature, which serves as a tension rod that extends through a coaxial bore of the attachment flange.
• the attachment flange due to the clamping system working with wedges, also fixes the tool head, so that other clamping systems cannot be coupled.
• the object of the invention is to provide a simple, inexpensive and rational possibility of also being able to use modular tool systems on the conventional spindles for machine tools without the spindles having to be removed or changed in this way, that conventional tools can no longer be used.
• the adapter flange described in claim 1 is proposed, which is characterized in that it can be inserted into the receiving bore of the spindle head, with between the A centering is defined in the receiving bore and the attachment flange, and in that a screw connection is provided between the tensioning rod and the front end of the tightening rod.
• Such an attachment flange for a spindle for a machine tool has the advantage that any modular tool systems can be used on conventional machine tools that are equipped with a pull-in rod for clamping steep taper adapters.
• no removal or modification of the machine tool spindle is necessary for this.
• the existing machine tool spindle remains in its original shape, so that conventional tools can be used again at any time without any problems.
• the attachment flange is equipped with a clamping mechanism which is adapted to the tool system used and which is actuated by the tension rod aligned with the tightening rod to fix the respective tool on the attachment flange. In this way, the existing clamping device of the machine tool can be used for the clamping mechanism of the modular tool system used.
• the tightening rod is usually provided with a tightening thread according to DIN 6369, the tensioning rod having a corresponding internal thread.
• the attachment flange is preferably screwed onto the end face of the spindle head.
• the threaded holes specified there can be used for screwing on the attachment flange in front of the spindle.
• the attachment flange has a rearward-facing circumferential ring, by means of which the attachment flange is placed around the spindle head, partially surrounding it in the manner of a sleeve, this circumferential ring, together with the outer surface of the spindle head, defining a centering. In this way, an external centering is created between the attachment flange and the spindle head.
• the axial movement of the pull rod and thus the tension rod is preferably limited by stops. In this way, incorrect operations and improper handling of the spindle are excluded.
• the tension rod is secured against rotation when the pull rod is rotatably mounted in the spindle head, wherein a rotational movement of the pull rod leads to an axial movement of the tension rod.
• the tightening rod is preferably completely rotated out of the clamping rod. In this way, a secure clamping and releasing of a tool head is guaranteed.
• a spring in particular helical spring, is arranged on the tension rod behind the attachment flange, which is fixed at its rear end to the tension rod and which with its front end moves forwardly when the tension rod moves axially to release a tool head on the back of the attachment flange.
• the spring preferably being designed in such a way that it retracts the clamping rod which has moved too far after the tool head has been pressed out, so that a problem-free change of tool head is still possible or the clamping elements are not yet in the clamping position.
• the tensioning rod has such a length and is axially displaceable in such a way that it can push out stuck tool heads when loosened.
• FIG. 1 shows a first embodiment of an attachment flange for a spindle, partly in section, different positions of the tightening rod being shown on both sides of the dash-dotted center line;
• FIG. 2 shows a second embodiment of an attachment flange corresponding to the illustration in FIG. 1.
• a spindle 10 has a spindle head 11. Starting from the front end face 12 of this spindle head 11, a receiving bore 13 is formed on the inside, which tapers conically towards the rear. The receiving bore 13 continues toward the rear into a cylinder bore 14, which in turn is followed by a cylinder bore 14 'with a smaller diameter.
• This cylinder bore 14 ' is provided with an extension 15. With the stop 23, this extension 15 serves as an axial stop of the tension rod 24 and can also serve in a spindle extension flanged onto the spindle.
• An attachment flange 16 is screwed onto the front end face 12 of the spindle head 11 of the spindle 10. If the spindle head 11 is a type according to DIN 2079, the threaded holes present there can be used.
• the screw connection between the attachment flange 16 and the spindle head 11 is not shown in the illustrated exemplary embodiments.
• both an inner centering and an outer centering are possible for centering the attachment flange 16 on the spindle head 11.
• the inner centering to the left of the dash-dotted center line and the outer centering to the right of the dash-dotted center line are shown.
• the illustration of the inner centering shows that the attachment flange 16 has a rear extension 17 which extends into the receiving bore 13 of the spindle head 11, with this extension 17 being fixed against the receiving bore 13 for internal centering is coming.
• the attachment flange 16 has a peripheral ring 18, by means of which the attachment flange 16 is pushed onto the spindle head 11, so that the peripheral ring 18 surrounds it in the manner of a sleeve.
• the internal centering can of course also be provided in the manner described above.
• the attachment flange 16 has a central bore.
• a pull rod 21 is mounted, which is designed, for example, according to DIN 6369. It has a thread 22 at the front end.
• the pull-in rod 21 is both axially displaceable and rotatable, as is indicated by the arrows.
• the tightening rod 21 is only axially displaceable within the cylinder bore 14 ', which is also indicated by the double arrow.
• a tensioning rod 24 is screwed onto the thread 22 of the tightening rod 21 and is provided with a blind hole thread for this purpose.
• the tension rod 24 is secured against rotation.
• the tightening rod 21 is rotatably mounted with its thread 22 in the tension rod 24, so that a rotational movement of the tightening rod 21 leads to an axial movement of the tension rod 24.
• the pull rod 21 is firmly screwed with its thread 22 into the tension rod 24, so that a rotational movement of the pull rod 21 is not possible here.
• an axial movement of the tension rod 24 can only be achieved if the pull rod 21 is axially displaced.
• a spring 26 in the form of a helical spring is arranged between the tension rod 24 and the rear side 25 of the attachment flange 16.
• an annular stop 27 against which the spring 26 is supported is arranged on the tension rod 24.
• the opposite end of the spring 26 8 in the drawing below) is provided with an axially displaceable ring on the tension rod 24.
• the spindle 10 with the attachment flange 16 is intended for accommodating modular tool systems.
• the spindle 10 is ready for operation, so that the tool can carry out the intended machining.
• the tightening rod 21 is rotated in the opposite direction.
• the pull-in rod 21 moves beyond the end face 30 of the attachment flange 16, as can be seen in the illustration on the right of the dash-dotted center line in FIG. 1.
• the clamping elements actuated via the clamping rod 24 release the tool head, the clamping rod 24 running against the tool head when the tool heads are stuck. Due to the further, loosening rotary movement, the pull rod 21 unscrews from the tensioning rod 24 and runs with its stop 23 against the upper axial limit in the extension 15.
• the further loosening rotating movement increases the pressure on the tensioning rod 24 and thus also on the fixed part ⁇ zenden tool head until it is ejected.
• the releasing rotary movement taking place causes the tension rod 24 to run against the spring 26, the rotational movement of the tightening rod 21 being continued until the tension rod 24 and the tightening rod 21 have separated.
• the spring 26 is compressed and therefore tensioned by the ring 29 being supported on the rear side 25 of the front flange 16. Due to the tensioned spring 26, the end thread of the tension rod 24 and the thread 22 of the tightening rod 21 butt against one another. This ensures that the threads can be found when tightening with a reverse rotation.
• the spring 26 is designed in such a way that the tension rod 24 is raised so far together with the pull-in rod 21 that a problem-free change of the tool head is possible.
• the spindle 10 is equipped without a rotating tension rod 21, so that an axial movement of the tension rod 24 for actuating the tensioning device is only possible by the fact that the tension rod 21 is correspondingly axially displaced.
• the tightening rod 21 In order to clamp a tool head in this way, for example, the tightening rod 21 must be moved backwards (upwards in FIG. 2) in order to achieve clamping of the tool head via the clamping rod 24. This is shown in Fig. 2 to the left of the dash-dotted center line. To release the tool head, the tightening rod 21 and thus the clamping rod 24 are then moved forward again, so that the clamping elements Release the tool head. This is shown in FIG. 2 on the right of the dash-dotted center line.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Gripping On Spindles (AREA)
• Jigs For Machine Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6363164

Family Applications (1)

Country Status (2)

Families Citing this family (4)

Citations (4)

Family Cites Families (1)

• 1988
  • 1988-09-17 DE DE19883831666 patent/DE3831666A1/de active Granted
• 1989
  • 1989-09-12 WO PCT/DE1989/000587 patent/WO1990003237A1/de unknown

Patent Citations (4)

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