Internal grinder
First Claim
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1. An internal grinding machine comprising;
- a spindle rotor having a grinding wheel fixed at one end thereof through a grinding wheel shaft;
a spindle head encompassing said spindle rotor;
rotational driving means for rotationally driving a workpiece having a bore about an axis of rotation parallel with the bore;
feeding means for providing relative movement between said grinding wheel and the workpiece;
electromagnetic bearing means coupled with said spindle rotor for magnetically floating and supporting said spindle rotor;
sensing means for detecting a position of said spindle rotor relative to said electromagnetic bearing means;
means for sensing the axial position of the grinding wheel relative to a surface of the bore;
calculating means for calculating a predetermined tilt angle of said grinding wheel relative to the axis of rotation of the workpiece for different axial positions of said grinding wheel relative to a surface of the bore in the workpiece and including means for storing data corresponding to the tilt angle for each relative position; and
control means for controlling said electromagnetic bearing means to tilt the axis of said spindle rotor at the calculated predetermined tilt angle of said grinding wheel for the said positions sensed by the means sensing the axial position of the grinding wheel relative to the surface of the bore.
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Abstract
An internal grinding apparatus having a grinding wheel attached to a spindle rotor radially and axially supported by electromagnetic bearings. Currents applied to the electromagnetic bearings are continuously controlled by a controlling system including a central processing unit during grinding work in order to adjust the longitudinal axis of the spindle rotor. The longitudinal axis of the spindle rotor is inclined and/or shifted at predetermined locations of the grinding wheel in a bore of a workpiece, thereby eliminating tapering of the long bore, and improving the cylindricality and straightness in grinding work.
38 Citations
24 Claims
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1. An internal grinding machine comprising;
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a spindle rotor having a grinding wheel fixed at one end thereof through a grinding wheel shaft; a spindle head encompassing said spindle rotor; rotational driving means for rotationally driving a workpiece having a bore about an axis of rotation parallel with the bore; feeding means for providing relative movement between said grinding wheel and the workpiece; electromagnetic bearing means coupled with said spindle rotor for magnetically floating and supporting said spindle rotor; sensing means for detecting a position of said spindle rotor relative to said electromagnetic bearing means; means for sensing the axial position of the grinding wheel relative to a surface of the bore; calculating means for calculating a predetermined tilt angle of said grinding wheel relative to the axis of rotation of the workpiece for different axial positions of said grinding wheel relative to a surface of the bore in the workpiece and including means for storing data corresponding to the tilt angle for each relative position; and control means for controlling said electromagnetic bearing means to tilt the axis of said spindle rotor at the calculated predetermined tilt angle of said grinding wheel for the said positions sensed by the means sensing the axial position of the grinding wheel relative to the surface of the bore. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An internal grinding machine comprising:
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a spindle rotor having a grinding wheel fixed at one end thereof through a grinding wheel shaft; a spindle head encompassing said spindle rotor; rotational driving means for rotationally driving a workpiece having a bore about an axis of rotation parallel with the bore; feeding means for providing relative movement between said grinding wheel and the workpiece; electromagnetic bearing means coupled with said spindle rotor for magnetically floating and supporting said spindle rotor; sensing means for detecting a position of said spindle rotor relative to said electromagnetic bearing means; means for sensing the axial position of the grinding wheel relative to a surface of the bore; calculating means for calculating a predetermined shift of said spindle rotor parallel to the axis of rotation of the workpiece for different axial positions of said grinding wheel relative to a surface of the bore in the workpiece and including means for storing data corresponding to the shift for each relative position; and control means for controlling said electromagnetic bearing means to tilt the axis of said spindle rotor at the predetermined calculated shift for the axial positions sensed by the means sensing the axial position of the grinding wheel relative to the surface of the bore. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An internal grinding machine comprising:
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a spindle rotor; means fixing a grinding wheel to one end of the rotor; means for rotatably driving a workpiece having a bore about an axis of rotation parallel to the bore; means for relatively axially moving the workpiece and the grinding wheel; electromagnetic bearing means for magnetically floating and supporting said spindle rotor in any one of a plurality of tilt angles relative to the axis of rotation; means for storing a predetermined tilt angle for the rotor for each of a plurality of relative axial positions of the grinding wheel and workpiece; means for sensing the relative axial position of the workpiece and grinding wheel; and means responsive to the sensed relative axial position of the workpiece and grinding wheel for controlling the electromagnetic bearing means to move the rotor into the predetermined tilt angle for said sensed relative axial position. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An internal grinding machine comprising:
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a spindle rotor; means fixing a grinding wheel to one end of the rotor; means for rotatably driving a workpiece having a bore about an axis of rotation parallel to the bore; means for relatively axially moving the workpiece and the grinding wheel; electromagnetic bearing means for magnetically floating and supporting said spindle rotor in any one of a plurality of shift positions perpendicular to the axis of rotation while maintaining the rotor parallel to the axis of rotation; means for storing a predetermined shift for the rotor for each of a plurality of relative axis positions of the grinding wheel and workpiece; means for sensing the relative axial position of the workpiece and grinding wheel; and means responsive to the sensed relative axial position of the workpiece and grinding wheel for controlling the electromagnetic bearing means to move the rotor into the predetermined shift for said sensed relative axial position. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification