WORKPIECE CLAMPING DEVICE AND SPINDLE ARRANGEMENT FOR A MACHINE TOOL

Abstract

A spindle arrangement for a machine tool, having a spindle shaft, having a workpiece clamping device for accommodating and clamping an internally-toothed ring gear, wherein the workpiece clamping device is designed as cup-shaped and has a circumferential collar, wherein the circumferential collar delimits an opening for accommodating and clamping an internally-toothed ring gear. The workpiece clamping device further includes a damping device, which has an oscillating mass, damping elements, and spring elements, wherein the oscillating mass, the damping elements, in the spring elements are arranged outside the opening in the area of an outer side of the collar facing away from the opening.

Claims

1. A workpiece clamping device, wherein the workpiece clamping device is designed as cup-shaped and has a circumferential collar, wherein the circumferential collar delimits an opening for accommodating and clamping an internally-toothed ring gear, having a damping device, which has an oscillating mass, damping elements, and spring elements, wherein the oscillating mass, the damping elements, in the spring elements are arranged outside the opening in the area of an outer side of the collar facing away from the opening.

2. The workpiece clamping device as claimed in claim 1, wherein the oscillating mass is a ring, which encloses the collar on a circumferential side.

3. The workpiece clamping device as claimed in claim 1, wherein a spacing is formed between the oscillating mass and the collar, in particular a gap is formed.

4. The workpiece clamping device as claimed in claim 1, wherein the damping elements bear on the oscillating mass.

5. The workpiece clamping device as claimed in claim 1, wherein a centering cover is provided, which is connected to an end face of the collar, wherein the damping device is held on the centering cover.

6. The workpiece clamping device as claimed in claim 5, wherein at least a part of the damping elements are arranged between the centering cover and oscillating mass.

7. The workpiece clamping device as claimed in claim 1, wherein a lid is provided, wherein damping elements are arranged between the lid and the oscillating mass.

8. The workpiece clamping device as claimed in claim 1, wherein the spring elements are screw connections.

9. The workpiece clamping device as claimed in claim 6, wherein the lid and the oscillating mass are held by of the screw connections on the centering cover, whereby screws and/or threaded rods of the screw connections penetrate the centering cover, the oscillating mass, and the cover.

10. The workpiece clamping device as claimed in claim 1, wherein the damping elements are arranged in pairs with a radial spacing to one another and/or the damping elements are arranged distributed at equidistant angular spacings relative to one another and/or the damping elements have a circular cross section.

11. A spindle arrangement for a machine tool, having a spindle shaft and having a workpiece clamping device as claimed in claim 1, wherein the workpiece clamping device is fastened on the spindle shaft.

Description

[0042] The invention is described in more detail hereinafter on the basis of a drawing illustrating exemplary embodiments. In the schematic figures:

[0043] FIG. 1 shows a first spindle arrangement according to the invention having a workpiece clamping device according to the invention;

[0044] FIG. 2 shows a second spindle arrangement according to the invention in a sectional view having a further workpiece clamping device according to the invention;

[0045] FIG. 3 shows the second spindle arrangement according to the invention in a prospective exploded view.

[0046] FIG. 1 shows a first spindle arrangement 2 according to the invention in a sectional view.

[0047] The spindle arrangement 2 is a spindle arrangement for a machine tool. The spindle arrangement 2 has a spindle shaft 4. The spindle arrangement 2 has a workpiece clamping device 6 for accommodating and clamping an internally-toothed ring gear 8.

[0048] The workpiece clamping device 6 is fastened on the spindle shaft 4. The workpiece clamping device 6 is designed as cup-shaped and has a circumferential collar 10. The circumferential collar 10 delimits an opening 12 for accommodating the internally-toothed ring gear 8.

[0049] The circumferential collar 10 is annular and has a circular-cylindrical shape.

[0050] The workpiece clamping device 6 is designed as rotationally symmetrical to a spindle axis A of the spindle shaft 4, wherein the spindle axis A is at the same time an axis of rotation of the spindle shaft 4, around which the spindle shaft 4 is rotatably mounted.

[0051] The spindle arrangement 2 has a damping device 14.

[0052] The damping device 14 has an oscillating mass 16, damping elements 18, and spring elements 20. The damping device 14 is connected by means of a fastening element 21 to the workpiece clamping device 6.

[0053] The oscillating mass 16, the damping elements 18, and the spring elements 20 are arranged outside the opening 12 in the area of an outer side 22 of the collar 10 facing away from the opening 12.

[0054] The oscillating mass 16 is a ring 16 which encloses the collar 10 on the circumferential side. A spacing in the form of a gap 24 is formed between the ring 16 and the collar 10.

[0055] The damping elements 18 are accommodated in the gap 24 between the ring 16 and the collar 10. The damping elements 18 bear both on the ring 16 and on the collar 10.

[0056] The damping elements 18 comprise a plastic material. The spring elements 20 and the oscillating mass 16 comprise a metallic material.

[0057] The spindle shaft 4 is rotatably mounted in a fixed housing 26, wherein two bearings 28 are shown in the present case.

[0058] FIG. 2 shows a second spindle arrangement 30 according to the invention for a machine tool.

[0059] The spindle arrangement 30 has a spindle shaft 32. The spindle arrangement 30 has a workpiece clamping device 34 for accommodating and clamping an internally-toothed ring gear 36. The workpiece clamping device 34 is fastened on the spindle shaft 32.

[0060] The workpiece clamping device 34 is designed as cup-shaped and has a circumferential collar 38, which delimits an opening 40 for accommodating the internally-toothed ring gear 36.

[0061] The spindle arrangement 30 has a damping device 42. The damping device 42 has an oscillating mass 44, damping elements 46, and spring elements 48.

[0062] The oscillating mass 44, the damping elements 46, and the spring elements 48 are arranged outside the opening 40 in the area of an outer side 50 of the collar 38 facing away from the opening 40.

[0063] The oscillating mass 44 is a ring 44, which encloses the collar 38 on the circumferential side. A spacing in the form of a circular circumferential ring gap 52 is provided between the oscillating mass 44 and the collar 38.

[0064] The damping elements 46 bear on the oscillating mass 44.

[0065] The spindle arrangement 30 has a centering cover 54, which is connected by screws in the area of an end face 57 of the collar 38.

[0066] The damping device 42 is held on the centering cover 54.

[0067] Damping elements 46 of the damping device 42 are held between the centering cover 54 and the oscillating mass 44.

[0068] The spindle arrangement 30 has a lid 56, wherein damping elements 46 of the damping device 42 are arranged between the lid 56 and oscillating mass 44.

[0069] The damping elements 46 of the damping device 42 are clamped between the cover 56, the oscillating mass 44, and the centering cover 54.

[0070] The spring elements 48 are screw connections in the present case, wherein the screw connections 48 are used at the same time to clamped the damping elements 46 between the lid 56, the oscillating mass 44, and the centering cover 54.

[0071] The centering cover 54 has a shoulder 58, which forms a receptacle and encloses the collar 38 on the circumferential side at least in some sections. An inner lateral surface 60 of the centering cover 54 bears on an outer lateral surface 62 of the collar 38 in order to achieve centering of the damping device 42 relative to the collar or on the collar 38.

[0072] A diameter of the workpiece clamping device 34 is smaller than a diameter of the centering cover 54. The damping device 42 is connected by screws to the centering cover 54 in the area protruding radially beyond the diameter of the workpiece clamping device 34.

[0073] Furthermore, a radial lid 64 is provided, which encloses the oscillating mass 44 on the circumferential side. The radial lid 64 is connected by screws by means of a screw connection 66 to the centering cover 54.

[0074] The screw connections 48 have a screw 68 and a nut 70 in the present case. A screw shaft of the screw 68 penetrates an assigned passage opening of the centering cover 54, the oscillating mass 44, and the cover 56 in each case.

[0075] A threaded pin 72, which bears on the collar 38, is seated in the lid 46.

[0076] FIG. 3 shows the spindle arrangement 30 according to the invention in a prospective exploded view.

[0077] The damping elements 46 are arranged in pairs with a radial spacing to one another in the present case. Moreover, the pairs of the damping elements 46 are arranged distributed relative to one another at equidistant angular spacings.

[0078] The damping elements 46 have a circular cross section and are sealing cords.

[0079] The oscillating mass 44 has groups 74 spaced apart radially from one another, which are used to accommodate the sealing cords 46.

[0080] The cover 56 has a clearance fit with the collar 38, i.e., a spacing or gap is formed between the cover 56 and the collar. The threaded pins 72 are used to fix the cover 56 on the collar 38.

[0081] The radial lid 64 is seated with play in the cover 56. The radial lid 64 can therefore execute torsional oscillations relative to the cover 56 and vice versa.

LIST OF REFERENCE NUMERALS

[0082] 2, 30 spindle arrangement [0083] 4, 32 spindle shaft [0084] 6, 34 workpiece clamping device [0085] 8, 36 internally-toothed ring gear [0086] 10, 38 circumferential collar [0087] 12, 40 opening [0088] 14, 42 damping device [0089] 16, 44 oscillating mass [0090] 18, 46 damping element/sealing cord [0091] 20, 48 spring elements/screw connections [0092] 21 fastening element [0093] 22, 50 outer side [0094] 24, 52 gap/ring gap [0095] 26 housing [0096] 28 bearing [0097] 54 centering cover [0098] 56 lid [0099] 57 end face [0100] 58 shoulder [0101] 60 inner lateral surface [0102] 62 outer lateral surface [0103] 64 radial cover [0104] 66 screw connections [0105] 68 screw [0106] 70 nut [0107] 72 threaded pin [0108] 74 groove