WORKPIECE SPINDLE FOR A MAGNETIC-SHOE EXTERNAL CYLINDRICAL GRINDING MACHINE, AND MAGNETIC-SHOE EXTERNAL CYLINDRICAL GRINDING MACHINE

Abstract

A workpiece spindle for a magnetic-shoe external cylindrical grinding machine a spindle for rotating a ring-shaped workpiece, a holding device for holding the ring-shaped workpiece and a hydraulic magnetic core lifting device coupled to the spindle and to the holding device to vary an axial spacing between the holding device and the spindle. The holding device has a magnetic shoe for clamping the ring-shaped workpiece in the holding device.

Claims

1.-9. (canceled)

10. A workpiece spindle for a magnetic-shoe external cylindrical grinding machine comprising: a spindle for rotating a ring-shaped workpiece; a holding device for holding the ring-shaped workpiece, comprising: a magnetic shoe for clamping the ring-shaped workpiece in the holding device; and a hydraulic magnetic core lifting device coupled to the spindle and to the holding device to vary an axial spacing between the holding device and the spindle.

11. The workpiece spindle of claim 10, wherein the holding device is designed to rest against the ring-shaped workpiece from radially within.

12. The workpiece spindle of claim 10, wherein the holding device is configured to leave the ring-shaped workpiece freely accessible radially outwardly and on a first end face pointing away from the spindle.

13. The workpiece spindle of claim 10, wherein the holding device comprises a plurality of axial stops offset relative to one another in a circumferential direction for axial striking against a second end face of the ring-shaped workpiece facing the spindle in a recessed position.

14. The workpiece spindle of claim 10, wherein the holding device comprises a magnetic device for holding the ring-shaped workpiece secure magnetically.

15. The workpiece spindle of claim 10, wherein the holding device comprises an exchangeable adapter for receiving the ring-shaped workpiece.

16. The workpiece spindle of claim 15, wherein the exchangeable adapter is configured to receive more than one differently formed ring-shaped workpiece.

17. The workpiece spindle of claim 10, further comprising a locking device for holding the spindle secure.

18. A magnetic-shoe external cylindrical grinding machine for cylindrical grinding and surface-grinding of a ring-shaped workpiece comprising: the workpiece spindle of claim 10 for holding the ring-shaped workpiece during grinding; a first grinding disk for cylindrical grinding of a radially outer lateral surface of the ring-shaped workpiece; and a second grinding disk for surface grinding of a first end face of ring-shaped workpiece.

19. The magnetic-shoe external cylindrical grinding machine of claim 18 further comprising a feed arm for delivering a plurality of individual ring-shaped workpieces to the holding device, wherein: the feed arm comprises a movable loading mandrel for displacing the ring-shaped workpiece; and the movable loading mandrel can be positioned in an axial direction in front of the spindle or in front of the holding device.

20. A magnetic-shoe external cylindrical grinding machine for cylindrical grinding and surface-grinding of a ring-shaped workpiece comprising: the workpiece spindle of claim 10 for holding the ring-shaped workpiece during grinding; a single grinding disk for: cylindrical grinding of a radially outer lateral surface of the ring-shaped workpiece; and surface grinding of a first end face of the ring-shaped workpiece.

21. The magnetic-shoe external cylindrical grinding machine of claim 20 further comprising a feed arm for delivering a plurality of individual ring-shaped workpieces to the holding device, wherein: the feed arm comprises a movable loading mandrel for displacing the ring-shaped workpiece; and the movable loading mandrel can be positioned in an axial direction in front of the spindle or in front of the holding device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention is explained by way of example below with reference to the attached drawings with the help of preferred exemplary embodiments, wherein the features depicted below may each represent an aspect of the invention individually, and also in combination. In the drawings:

[0017] FIG. 1 shows a schematic sectional view of a workpiece spindle for a magnetic-shoe external cylindrical grinding machine,

[0018] FIG. 2 shows a schematic perspective view of an adapter for the workpiece spindle from FIG. 1,

[0019] FIG. 3 shows a schematic rear view of a feed arm for delivering an annular workpiece to the workpiece spindle from FIG. 1, and

[0020] FIG. 4 shows a schematic front view of the feed arm from FIG. 3.

DETAILED DESCRIPTION

[0021] The workpiece spindle 10 depicted in FIG. 1 for a magnetic-shoe external cylindrical grinding machine has a spindle 12 which can be set in rotation via a belt pulley 14, for example, with the help of a wrap-around means driven by a motor. The angular position of the spindle 12 can be measured with the help of an encoder 16. The workpiece spindle 10 has a holding device 18 which can hold a ring-shaped workpiece 21 (ref. FIG. 3 and FIG. 4) secure for the grinding process via an exchangeable adapter 20. For this purpose, a magnetic device 22 interacting with magnetic shoes 46 (cf. FIG. 4) is provided in which a switchable electrically connected coil 24 with an iron core 26 forms an electromagnet. The holding device 18 is movably configured in an axial direction relative to the spindle 12 via a hydraulically operable magnetic core lifting device 28. For this purpose, the hydraulic magnetic core lifting device 28 may have a piston 30 guided in the spindle 12 in an axial direction which is connected to the holding device 18 via the iron core 26, for example.

[0022] In order to insert an annular workpiece 21, the hydraulic magnetic core lifting device 28 may introduce the holding device 18, so that the workpiece 21 can be positioned in an axial direction in front of the holding device 18. Thereafter, the holding device 18 can be extended and receive the workpiece 21 with the adapter 20. The adapter 20 depicted in FIG. 2 may have an outer lateral surface 32 that is beveled in a conical manner for this purpose, with which the ring-shaped workpiece 21 can be received in a centered fashion from radially within. In particular, the adapter 20 has recesses 34 extending in an axial direction into which straps projecting axially from a ring body of the workpiece 21 can project. With the help of the encoder 16, the spindle 12 and the holding device 18 connected to the spindle 12 via the hydraulic magnetic core lifting device 28 can be rotated into an angular position in which the projecting straps of the workpiece 21 positioned in a defined angular position in front of the holding device 18 can dip into the recesses 34 in the adapter 20 without striking the adapter 20 or another component. The adapter 20 also has multiple, for example exactly three, axial stops 36 which may strike the workpiece 21, for example in order to limit the insertion depth of the outer lateral surface pressed into the inner diameter of the workpiece 21. In particular, the axial stops 36 do not strike the straps, but an end face of the ring body of the workpiece 21, from which the straps project axially, so that the contact of the axial stops 36 at the ring body of the workpiece 21 can be used as a reference point, so that during surface-grinding of the end face of the workpiece 21 pointing away from the spindle 12, an axial ring width of the ring body of the workpiece 21 can easily be manufactured with high precision.

[0023] In order to allow the ring-shaped workpiece 21 to be introduced, a feed arm 38 depicted in FIG. 3 and FIG. 4 can be provided in which the ring-shaped workpieces 21 can be held in an intake channel 40. With the help of a workpiece slide 42, the workpieces 21 can be separated and individually fed to a loading mandrel 44. The loading mandrel 44 may receive the ring-shaped workpiece 21 and position it in front of the workpiece spindle 10, for example through a pivoting movement about a spaced apart rotational axis. For example, the workpiece 21 may be deposited on magnetic shoes 46, wherein the loading mandrel 44 and/or the magnetic shoes 46 may preferably form an axial support when the adapter 20 of the holding device 18 is inserted into the ring-shaped workpiece 21. After grinding, the loading mandrel 44 can transport the finished workpiece 21 back into the feed arm 38 again, where the workpiece 21 can be removed via an outlet channel 48.

REFERENCE NUMERALS

[0024] 10 Workpiece spindle [0025] 12 Spindle [0026] 14 Belt pulley [0027] 16 Encoder [0028] 18 Holding device [0029] 20 Adapter [0030] 21 Workpiece [0031] 22 Magnetic device [0032] 24 Coil [0033] 26 Iron core [0034] 28 Lifting device [0035] 30 Piston [0036] 32 Outer lateral surface [0037] 34 Recess [0038] 36 Axial stop [0039] 38 Feed arm [0040] 40 Intake channel [0041] 42 Workpiece slide [0042] 44 Loading mandrel [0043] 46 Magnetic shoes [0044] 48 Outlet channel