Internal abrasive machine

Details Internal abrasive machine Internal abrasive machine

1999-12-30

2001-11-27

Rachuba, M. (Department: 3724)

Abrading

Precision device or process - or with condition responsive...

With feeding of tool or work holder

C451S010000, C451S180000

Reexamination Certificate

active

06322423

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an internal abrasive machine, i.e. a machine tool designed for removing material from the inner envelope surface of annular work pieces, and particularly an internal grinding machine for grinding the bore of bearing rings and of the type defined in the preamble of the accompanying claim
1
.
Abrasive machines such as grinding machines, lapping machines, honing machines, milling machines, etcetera, are known in many slightly different designs and embodiments. It is desirous that the machine is compact and as space-saving as possible. For obtaining a good machining result on the other hand it is important that the co-operating parts of the machine has a high mutual stiffness and low tendencies of vibration. These last-mentioned properties are often obtained by giving the machine a heavy bedding and a sturdy and robust design, and therefore these two requirements are often contradictory to the desires for compactness and space-saving properties.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide an internal abrasive machine which fulfils these, partly contradictory properties, and this has been obtained by an internal abrasive machine for abrading material from an inner surface of a workpiece. The machine comprises a hollow casing mounted in a support structure for rotation about a first longitudinal axis. The casing forms a first inner space. A lid is fixed to a longitudinal end of the casing. A first drive mechanism is connected to the casing for rotating the casing and the lid about the first longitudinal axis. A clamp is provided for clamping a workpiece to the lid for rotation therewith about the first longitudinal axis. A housing is mounted in the first inner space and forms a cylindrical second space having a second longitudinal axis arranged parallel to and offset from the first longitudinal axis. A shaft is mounted in the second inner space, wherein the housing and the shaft are angularly movable relative to one another. The shaft forms a third inner space. A second drive mechanism is mounted in the third inner space. A spindle is connected to the second drive mechanism and it defines a spindle axis extending eccentrically relative to the first longitudinal axis. The spindle is connected to the second drive mechanism to be rotated thereby about the spindle axis. An abrasive tool is fixed to an outer end of the spindle for rotation therewith. A third drive mechanism is connected to the shaft for displacing the shaft and the spindle in a direction coinciding with the spindle axis into and from the inner surface of the workpiece. A fourth drive mechanism is connected to one of the housing and the shaft for producing relative rotation between the housing and the shaft to angularly displace the spindle in a direction extending laterally relative to the first longitudinal axis for bringing the abrasive tool into contact with the inner surface of the workpiece.


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