US 5,384,983 A · Method and grinding machine for the internal grinding of bores

Abstract

In the process or internally grinding bores with the aid of a slightly conical grinding wheel (15) in a computer controlled manner, the rotational axis (14) of the grinding wheel is adjusted to a small angle (.alpha.) in relation to the rotational axis (3a) of the workpiece (5). The grinding wheel is sharpened along a generatrix which lies opposite the generatrix of the wheel when the wheel is in rough grinding engagement with the bore. The rough grinding operation is carried out at a feed pressure such that twice this angle (i.e. 2(.alpha.) is levelled-out or eliminated and the respective generatrices of the wheel and the bore will substantially coincide. The fine grinding phase of the grinding operation is carried out with substantially coinciding bore and grinding wheel generatrices along an opposite bore generatrix in relation to the rough grinding engagement location. The invention also relates to a grinding machine for carrying out the method.

Claims10

Dependent claims

A method for a computer-controlled internal grinding of a workpiece bore with a conical grinding wheel carried on a free end of a flexible grinding spindle extension (14) with substantially full abutment between respective generatrices of the grinding wheel and the bore, both during a rough grinding phase and a fine grinding phase of a bore grinding operation, comprising the steps of:

a) positioning a rotational axis of the conical grinding wheel at a small angle (.alpha.) relative to a rotational axis of the bore, said conical grinding wheel having a conicity tapering inwardly at said small angle from the free end of the spindle extension;
b) sharpening the grinding wheel along a generatrix disposed diametrically opposite a generatrix along which the grinding wheel engages the bore;
and
c) carrying out the rough grinding phase at a workpiece feed pressure which bends the flexible spindle extension to about twice said small angle (2.alpha.) such that the generatrix of the grinding wheel coincides substantially with the generatrix of the bore.

1 more element

A grinding machine for internally grinding a workpiece bore with full abutment between a generatrix of a grinding wheel and a generatrix of the bore, both in rough grinding and fine grinding phases, said grinding machine including:

a) a chuck spindle (3) mounted on a feed slide (2) and supporting a workpiece (5) having a bore (6) formed therein;
b) a table slide (11) mounting a grinding spindle (13) provided with a flexible grinding spindle extension (14), and a conical grinding wheel (15) mounted on a free end of said extension;
c) means (10) for positionally adjusting and fixing the grinding spindle such that a rotational axis thereof defines a predetermined angle (.alpha.) in relation to a rotational axis (3a) of the workpiece bore;
d) means for regulating a feed pressure of the workpiece during the grinding operation;
e) a grinding wheel sharpening tool (22);
and
f) a computer for controlling the grinding process, wherein:
g) the conical grinding wheel (15) tapers conically inwardly from the free end of the grinding spindle extension (14) at said predetermined angle;
h) the sharpening tool (22) is adapted to engage the grinding wheel along a generatrix which is substantially diametrically opposite a grinding wheel generatrix when said wheel is in rough grinding engagement with the bore (6);
and
i) rough grinding engagement takes place at a feed pressure which bends the flexible spindle extension to about twice the predetermined angle (2.alpha.) generatrix and the grinding wheel generatrix substantially coincide.

8 more elements

Dependencies are inferred from the claim text.

Method and grinding machine for the internal grinding of bores

Life of this patent

Method and grinding machine for the internal grinding of bores

Life of this patent

Abstract

Claims10