GB1430042A - Vertical grinding machines - Google Patents

Abstract

1430042 Grinding M NEUMAN 7 Feb 1974 05779/74 Heading B3D Apparatus for grinding the bore and outer periphery of an annulus 16 comprises a horizontal base 1 supporting at least one workpiece carrier device 5, a vertical column 2 mounted on the base, at least one collar 3 rotatably mounted on the column and having at least one head 19 comprising a grinder-carrier spindle, means 24, 25 to effect axial sliding of the collar along the column in a reciprocating manner, and means 32 for effecting angular drive of the collar. As described, two collars 3, 4 are supported by hydrostatic bearings 17 on the column 2 and each collar has a plurality of lands 3a, 4a on each of which is a grinder carriage 19. The periphery of the base supports a plurality of workpiece carrier devices 5, each disposed between a pair of grinder carriages 19 and consisting of a magnetic plate 15 for holding a workpiece 16, such as the inner or outer ring of a ball or roller bearing, the plate being carried by a table 12 on a shaft 10 rotated by bevel gearing 9 driven from a motor 7. Collar 4 is supported by a hydrostatic bearing 18 on collar 3 which, in turn, is supported by hydrostatic bearings 23 on arms 24a extending through openings 2a in the column from a central disc 24 which can be raised and lowered by a piston- and-cylinder device 25 to effect reciprocation of the collars and the grinding devices 19 carried thereby. Each device 19 comprises a grinding wheel 21 carried by a spindle 20 driven by a motor 22, the spindles of the devices carried by collar 4 being longer than those carried by collar 3 so that the wheels 21 are in the same horizontal plane. Each collar is provided with a toothed segment 26, 27 engaged by a respective screw 28, 29 which is mounted in a sleeve 30 carried on a post 31 and can be rotated by a motor 32. Detectors 35, 36 and 39, 40 sense the axial and angular positions of the collars. In another embodiment, the collar 4 is axially adjustable independently of collar 3 and the screws are mounted in separate sleeves on the post. In operation, the workpieces 16 are held on the magnetic plates 15 and rotated by the drives 7, 9, and the collars are adjusted to position the grinding wheels for grinding the bores and outer peripheries of the workpieces simultaneously, the collars and grinding wheels being reciprocated by actuation of the device 24. The motors 32 act on the screws 28, 29 to adjust the collars and effect feed of the grinding wheels. The wheels are trued by devices R.