EP4076810A1 - Wellenkupplung für werkzeugmaschinen - Google Patents

Wellenkupplung für werkzeugmaschinen

Info

Publication number
EP4076810A1
EP4076810A1 EP20838411.5A EP20838411A EP4076810A1 EP 4076810 A1 EP4076810 A1 EP 4076810A1 EP 20838411 A EP20838411 A EP 20838411A EP 4076810 A1 EP4076810 A1 EP 4076810A1
Authority
EP
European Patent Office
Prior art keywords
spindle
driver ring
tool holder
tool
cone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20838411.5A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ronald Naderer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferrobotics Compliant Robot Technology GmbH
Original Assignee
Ferrobotics Compliant Robot Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ferrobotics Compliant Robot Technology GmbH filed Critical Ferrobotics Compliant Robot Technology GmbH
Publication of EP4076810A1 publication Critical patent/EP4076810A1/de
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/02—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections with conical parts
    • 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
    • B23B31/008—Chucks; Expansion mandrels; Adaptations thereof for remote control with arrangements for transmitting torque
    • 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
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
    • B23B2231/0292—Flanges of conical shanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/12—Chucks having means to amplify the force produced by the actuating means to increase the clamping force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/084—Hirth couplings

Definitions

  • the present invention relates to a shaft coupling for connecting a tool holder to the motor shaft of a machine tool.
  • Shaft couplings are used in a variety of machine tools (e.g. drills, lathes, grinding machines, etc.) in which a rotatable tool is to be connected to the drive shaft (e.g. motor shaft or output shaft of a gearbox) of a machine tool.
  • the tool can be mounted on a short shaft, which is referred to as a tool holder.
  • the drive shaft of a machine tool is often referred to as a spindle and has a mechanism with which the tool holder and tool can be mechanically coupled to the motor shaft.
  • This mechanism includes, for example, a collet, which is designed to grip a pull stud of the tool holder and to connect the tool holder to the motor shaft in a non-positive manner.
  • the non-positive connection between the tool holder and the motor shaft is usually realized with the help of a tapered seat.
  • Tool holders are therefore often referred to as tool cones.
  • the collet can be operated pneumatically, for example. In this case, a pneumatic actuator with the collet pulls the tool cone (on the pull stud) against a corresponding inner cone in the motor shaft (spindle), creating a positive coupling between the motor shaft and the tool cone.
  • the space for the actuator mentioned, which operates the collet, is comparatively small; and for this reason, the actuator force that can be generated is required to clamp the tool cone in the spindle Is available, also relatively small.
  • the taper seat between the tool taper and the spindle cannot transmit sufficient torque and there is a risk that the taper seat will begin to slip.
  • One of the present invention underlying task can therefore be seen in ge to provide a shaft coupling for machine tools available that allows a relatively small size, a proper torque transmission between spindle and tool holder.
  • a device which, according to an exemplary embodiment, has a spindle for a machine tool, a driver ring and a tool holder.
  • the driver ring is so gela Gert on the spindle that it can be moved along an axis of rotation of the spindle.
  • the spindle and the tool holder have corresponding surfaces which are designed to form a non-positive connection when they are mounted (on one another). In the assembled state, opposing surfaces of the tool holder and the driver ring have corresponding contours, so that the driver ring can snap into place on the tool holder.
  • the device has a spindle for a machine tool, a driver ring mounted on the spindle and a tool holder.
  • the spindle is designed as a hollow shaft with an inner cone.
  • the driver ring is displaceable along an axis of rotation of the spindle, and the tool holder has an outer cone that matches the inner cone, the inner cone and outer cone forming a conical seat in the assembled state, and in the assembled state opposite surfaces of the tool holder and the driver ring have corresponding contours so that the driver ring can snap into the tool holder.
  • the conical seat in the assembled state, causes a positive connection between the spindle and the tool holder, while the engaged driver ring also causes a positive connection between the spindle and the tool holder.
  • the tool holder can have a tightening bolt which is shaped such that the tool holder on the tightening bolt can be pressed against the spindle by means of a collet.
  • the tool holder can have a plate which extends with respect to an axis of rotation of the tool holder in a radial direction and which has a geometric structure (for example in the form of webs or the like on a surface opposite the driver ring ) having.
  • the driver ring can have a geometric structure (for example in the form of grooves or the like) on its surface opposite the plate, the geometric structure on the surface of the plate and the geometric structure on the surface of the driver ring having corresponding contours so that the Geo metric structure on the surface of the driver ring can snap into the geometric structure on the surface of the plate.
  • a spring element which acts between the spindle and the driver ring, presses the driver ring against the tool holder.
  • the driver ring can have sliding pieces which are arranged displaceably in corresponding guide grooves in the spindle.
  • the spindle can have two end stops (e.g. in the guide grooves) which limit the movement of the driver ring in two directions.
  • Figure 1 illustrates tool cone (diagram a), driver ring (diagram b) and the end of the spindle of a machine tool (diagram c) as components of a shaft coupling according to an embodiment.
  • Figures 2-5 illustrate the components of the shaft coupling from Fig. 1 in different positions when coupling the tool cone and spindle in a cross-sectional view (diagram a), longitudinal section view (diagram b) and side view (diagram c).
  • Fig. 1 illustrates a tool cone 30 (diagram a), a driver ring 20 (diagram b) and an end piece of a spindle 10 of a machine tool (diagram c) according to an embodiment.
  • the driver ring 20 in addition to the frictional connection in the cone seat preventing the tool cone 30 from slipping by creating a form-fitting connection between Spindle 10 and tool 30 produces.
  • the individual components of the example described here are explained below, and then the coupling of tool cone 30 and spindle 10 is described with reference to FIGS. 2-5.
  • Fig. 1, diagram a shows an embodiment of a tool cone 30.
  • the tool cone 30 is a short shaft with an outer cone 34 which fits into a corresponding inner cone in the spindle 10 and forms a conical seat in the assembled state.
  • a tightening bolt 35 which can be gripped by a corresponding collet (not shown).
  • a thread 31 can be arranged, which enables the assembly of a rotatable tool (not shown, for example a grinding wheel).
  • the (screw) connection of tool and tool cone by means of thread is a common technique and is therefore not described further here. Instead of a screw connection, other connection techniques can also be used (bayonet lock, clamp connection, etc.).
  • the latter In the central region of the tool cone 30, the latter has a plate 32 which extends essentially at right angles to the axis of rotation of the tool cone 30.
  • the plate 32 can have a circular contour on the outside, but this does not necessarily have to be the case.
  • the plate On the side facing the spindle 10 (in the assembled state), the plate has webs 33 on its surface, which enable a latching connection between the plate 32 and the driver ring 20.
  • Fig. 1, diagram b shows an embodiment of the above-mentioned driver ring 20, which is mounted on the spindle 10 so as to be displaceable along the axis of rotation (and is, for example, guided along this).
  • the driver ring 20 has on its inside two or more sliders 22 (sliding blocks), with the help of which the driver ring 20 can be guided in corresponding grooves of the spindle 10. This guide enables a United displacement of the driver ring 20 along the axis of rotation, the possible displacement of the driver ring 20 is limited by two end stops.
  • the driver ring 20 On its underside (ie the side facing the plate 32 of the tool cone 30), the driver ring 20 has several grooves 21 in which the aforementioned webs 33 of the plate 32 can engage, creating a positive connection between the plate 32 of the tool cone 30 and the one on the Spindle 10 mounted driver ring 20 is formed.
  • the driver ring 20 mounted on the spindle 10 also rotates, and the water takes the tool cone 30 with it due to the positive connection. This prevents the cone seat from slipping through.
  • the driver ring 20 reliably engages in the webs 33 of the plate 32, the driver ring 20 is pressed against the plate 32 by means of a spring element (see FIGS. 2-5).
  • the positive connection between the driver ring 20 and the plate 32 of the tool cone 30 does not necessarily have to be implemented by means of corresponding webs and grooves.
  • corresponding pins and holes, corresponding locking lugs and depressions, and the like would also be possible, please include.
  • the driver ring 20 and plate 32 have corresponding contours on the opposite surfaces, which can interlock and thus form a form-fitting connection. The specific design of the corresponding contours is not important and can be implemented in many different ways.
  • Fig. 1, diagram c shows an embodiment of the spindle 10 of a machine tool.
  • the spindle 10 essentially a hollow shaft 11, the interior of the hollow shaft 11 having an inner cone 12 which fits to the outer cone 34 of the tool cone 30.
  • the inner cone 12 and the outer cone 34 form a conical seat in the assembled state.
  • the spindle 10 has two opposite guide grooves 14 in which (when the driver ring 20 is mounted) the sliders 22 of the driver ring 20 are arranged displaceably along the axis of rotation of the spindle 10.
  • further grooves 13 are located at the bottom of the guide grooves 13.
  • the driver ring 20 can be displaced along the axis of rotation until the lower end of the screws 23 rest against one end of the groove 13.
  • the grooves 13 form (together with the screws 23) in the example shown, the end stops which limit the displacement of the driver ring 20 with. It goes without saying that the end stops can also be implemented in other ways.
  • the bearing of the driver ring 20 on the spindle 10, which enables the driver ring 20 to be displaced along the axis of rotation, is important for the function of the exemplary embodiment.
  • a spring (not shown in Fig. 1 represents) press the driver ring 20 against the lower end stop (ie away from the machine tool) to ensure reliable engagement.
  • 2-5 show different positions of the tool cone 30 (relative to the spindle 10) during a coupling process in which the tool cone 30 is mechanically coupled to the spindle 10.
  • diagram a shows a cross section through the tool cone 30, diagram b, a corresponding longitudinal section and diagram c the associated side view.
  • the coupling process can be carried out fully automatically if the machine tool is guided by a robot and the tool cone 30 together with the tool is kept ready in a suitable manner, e.g. in a magazine.
  • Fig. 2, diagram b the above-mentioned guide of the driver ring 20, in particular the sliders 22 and the screws 23, which engage in the grooves 13, are shown.
  • the driver ring 20 is pressed by the spring element 25 against the lower end stop.
  • a ball bearing 15 for mounting the spindle 10 in the machine tool.
  • the angular position of the spindle 10 (and consequently also of the driver ring) relative to the plate 32 (and the webs 33) can be random in this situation, and in general the tool cone 30 will be rotated relative to the spindle 10 so that the driver ring 20 on the plate 32 can not lock immediately.
  • the spring element 25 can be any flexible (resilient) machine element, for example a spring washer, in particular a multi-wave spring washer, a cup spring (spring disc) or the like, or a piece of elastic plastic .
  • the tool cone 30 is completely inserted into the spindle 10, so that the outer cone 34 of the tool cone 30 makes mechanical contact with the inner cone 12 inside the spindle 10.
  • the tool cone 30 is held on the pull stud by means of the collet (not shown in FIG. 3), and the collet pulls the tool cone 30 into the spindle.
  • the webs 33 of the plate 32 press the driver ring 20 against the spring force of the spring element 25 upwards without engaging.
  • the driver ring 20 was moved almost to the upper end stop.
  • diagram a the angular position f of the tool cone 30 relative to the driver ring 20 is Darge provides.
  • the angle f is approximately equal to 20 °.
  • the tool cone 30 is mechanically coupled to the spindle 10, the connection being held in the conical seat only by the frictional connection, but not secured by the driver ring 20 (because the driver ring 20 is not yet engaged) .
  • the force (see Fig. 3, force F) is generated by an actuator, not shown in the illustrations, which presses the outer cone 34 of the tool holder 30 against the inner cone 12 of the spindle by means of the collet.
  • the angular position of the tool cone relative to the spindle is such that the spring element 25 can press the driver ring 20 against the plate 32 until the webs 33 engage in the grooves 21 of the driver ring 20 and the driver ring 20 clicks into place.
  • 5 shows the locked state in which the driver ring 20 is again approximately in its lower end position and a positive connection between the spindle 10 and the tool cone 30 is ensured. Further rotation of the tool cone 30 is not possible in this situation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping On Spindles (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP20838411.5A 2019-12-19 2020-12-17 Wellenkupplung für werkzeugmaschinen Pending EP4076810A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019107127.3U DE202019107127U1 (de) 2019-12-19 2019-12-19 Wellenkupplung für Werkzeugmaschinen
PCT/EP2020/086748 WO2021122977A1 (de) 2019-12-19 2020-12-17 Wellenkupplung für werkzeugmaschinen

Publications (1)

Publication Number Publication Date
EP4076810A1 true EP4076810A1 (de) 2022-10-26

Family

ID=74141483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20838411.5A Pending EP4076810A1 (de) 2019-12-19 2020-12-17 Wellenkupplung für werkzeugmaschinen

Country Status (7)

Country Link
US (1) US20230030445A1 (ja)
EP (1) EP4076810A1 (ja)
JP (1) JP2023506928A (ja)
KR (1) KR20220113425A (ja)
CN (1) CN114901409B (ja)
DE (1) DE202019107127U1 (ja)
WO (1) WO2021122977A1 (ja)

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Also Published As

Publication number Publication date
WO2021122977A1 (de) 2021-06-24
US20230030445A1 (en) 2023-02-02
DE202019107127U1 (de) 2021-03-22
KR20220113425A (ko) 2022-08-12
CN114901409B (zh) 2023-07-25
CN114901409A (zh) 2022-08-12
JP2023506928A (ja) 2023-02-20

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