Abrading – Machine – Rotary tool
Reexamination Certificate
1999-10-12
2001-05-22
Hail, III, Joseph J. (Department: 3723)
Abrading
Machine
Rotary tool
C451S049000, C451S121000, C451S142000, C451S251000
Reexamination Certificate
active
06234885
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a roll grinding machine for profile grinding of rolls with a device for adjusting a grinding wheel supported on a grinding spindle tangentially with respect to a roll profile.
BACKGROUND OF THE INVENTION
Such roll grinding machines are used, e.g., for grinding working and support rolls used in sheet metal rolling mills, plastic plate rolling mills, and calenders. These rolls always have, as a rule, a shape which deviates from a pure cylindrical shape, and have a concave or crowned profile or a combination of both. During grinding of these profiles, it proved to be disadvantageous that a grinding wheel, because of its shaft or grinding spindle extending parallel to its axis, almost always grinds the roll with an edge and thus does not contact the roll along its entire surface. As a result, the grinding is effected with a very small longitudinal feed to avoid the formation of steps in the roll, with a corresponding resulting increase of the grinding time.
To eliminate this drawback since long ago, it is known to so pivot the grinding wheel-supporting spindle and to adjust it with respect to the roll that the grinding wheel always engages the profile tangentially to a most possible extent, whereby the grinding can be effected with approximately an entire wheel width. In order to achieve this, the roll grinding machines are designed with a possibility of a pivotal movement of the upper rest. This, however, requires not only an additional separation of the support. In addition, on one hand, it is very difficult to achieve an absolutely hysteresis-free pivotal movement about a stationary point and, on the other hand, to achieve simultaneously the necessary for the grinding process damping in the separation surface.
BRIEF SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is a roll grinding machine of the above-described type in which the tangential adjustment of the grinding wheel is improved, and, in particular, is structurally simplified and, further, is possible with a greater precision.
This object is achieved according to the invention by arranging the grinding spindle in a rotatable sleeve formed, preferably, as an eccentric sleeve the longitudinal axis of which is inclined at an angle toward the longitudinal axis of the spindle. Thereby, unexpectedly, it became possible in a simple manner to adjust the grinding wheel with a reproducible precision of 1/100 &mgr;m by rotating the sleeve about the spindle, and actually independent of a cost-effective manufacturing of the roll profile, so that a desired adjustment is obtained with any geometry. Upon rotation of the sleeve, the grinding spindle, which is connected with an appropriate mechanism, is displaced with a main motion in the plan of the workpiece center and the grinding spindle center and is positioned at an angle, which corresponds to the amount of rotation, to the central axis of the workpiece. This angle can be calculated as a tangent to a curve by a NC-control unit of a high order computer and which is connected with the roll grinding machine.
According to a preferred embodiment of the invention, the point of intersection of both longitudinal axes lies in the center of the grinding wheel. Because of this stationary intersection point, the grinding spindle can be adjusted without a substantial change of the distance between the centers of the workpiece or the roll and of the grinding spindle. The precision of the tangential adjustment is further increased because of this.
When, advantageously, both the sleeve and the eccentric bushing are preloaded at their both ends, the precision of the grinding wheel adjustment is increased even further. For effecting the preloading, hydrostatic bearings or pre-loaded roller guides which, because of the rotational movement during the adjustment of the grinding spindle, can be used without any problem, are employed. A very large transmission ratio which is achieved according to the invention, between the rotational angle of the sleeve and the rotational angle of the grinding spindle, contributes, in addition, to that the adjustment movement of the grinding wheel upon its adjustment with respect to the roll profile, is reduced by this transmission ratio in proportion of about 1:100.
According to one embodiment of the invention, the sleeve is arranged on a grinding spindle-receiving eccentric bushing. In this way, the grinding spindle is not any more arranged directly in the inclined sleeve but in the inner eccentric busing so that a double eccentricity, which is particular suitable for fine adjustments, is achieved.
REFERENCES:
patent: 3469353 (1969-09-01), Klein
patent: 4077163 (1978-03-01), Bennett, Jr. et al.
patent: 5447463 (1995-09-01), Schmitz
patent: 5618224 (1997-04-01), Dumas
patent: 5738570 (1998-04-01), Rosenthal et al.
patent: 5997389 (1999-12-01), Dai Pan et al.
patent: 3726055 (1989-02-01), None
patent: 0333352 (1989-09-01), None
patent: 4159067 (1992-02-01), None
Patent Abstracts of Japan (European Patent Office) 4159067 Feb. 6, 1992.
Brown & Wood LLP
Hail III Joseph J.
Nguyen George
Waldrich Siegen Werkzeugmaschinenfabrik GmbH
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