Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1993-01-06
1994-03-15
Rachuba, M.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51178, B24B 4900
Patent
active
052937186
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tangential grinding machine, particularly for railway rails.
EP-A2-O 318 521 describes a tangential grinding machine comprising a rotating member, a plurality of abrasive sectors supported by supports radially movable on said rotating member, elements which radially move said supports in order to move said abrasive sectors outwards by an extend which compensates their wear, and a plurality of sensors which when a predetermined degree of wear is attained are activated to act under the control of an electronic unit on the radially movable supports, in order to restore the original grinding surface of the abrasive sectors which have undergone wear.
Because during working the grinding wheels wear in accordance with the deformation of the rail profile to be ground, and hence in a non-uniform manner, a grinding manner consisting essentially of a diamond-set tool is provided which, during the working of the machine, automatically recreates the profile of the abrasive sectors which is altering due to their wear.
This known grinding machine has proved effective in that it combines the merits of high operability and precise results with the merits of considerable compactness and a high degree of safety. In particular, it has been advantageously used in the case of tramway rails in which the limited vehicle speed, the weights and the stresses concerned are such as not to produce large deformation of the rail profiles. However in the case of railway rails the requirements are of a different kind, both because of the extent of the rail profile deformations and because of the nature of the deformations, which involve the formation on the top of the inner side of the rail of a substantially pronounced longitudinal projection, resulting in rapid and non-uniform wear of the abrasive sectors and a likewise rapid wear of the diamond-set tool used to restore their original profile.
GB-A- 2 110 966 disclosed a rotary grinder having a tool which rotates about an axis extending radially and essentially passing through the center of curvature of the band of the rail to be ground.
An aim of the invention is to realize a grinding machine which enables the profile of railway rail to be totally and perfectly ground however deformed.
A further aim of the invention is to realize a grinding machine which maintains a constant abrasive sector profile and restores it in a virtually perfect manner.
These and further aims are achieved according to the invention through a tangential grinding machine as described in claim 1.
The present invention is further clarified hereinafter with reference to the accompanying drawings, in which: grinding machine of the invention is based;
FIG. 2 is a cross-section through a rail portion to an enlarged scale;
FIG. 3 is a schematic side view of the grinding machine according to the invention;
FIG. 4 is a plane view thereof on the line IV--IV of FIG. 3;
FIG. 5 is a cross-section therethrough; and
FIG. 6 is a cross-section on the line VI--VI of FIG. 4.
As can be seen from the figures, the machine according to the invention comprises a structure 1 provided with wheels which run on the rail 3 to be ground. The tangential grinding device, indicated overall by 4, is of the type described in the cited EP-A2-O 318 521, none of the constructional details given in this latter having however been included in the present description, for reasons of clarity. It need merely be stated that this grinding device is provided with a plurality of abrasive sectors 5 rotated simultaneously by an electric motor 6 and mounted on supports (now shown) which are movable radially outwards to ensure that the circumferential grinding surface remains rigorously constant as the wear to which said sectors 5 are subjected during working varies. The outward movement of these supports and the relative abrasive sectors 5 is controlled by a plurality of sensors (now shown) which are normally "covered" by the sectors when they operate on the rail to be ground, but are uncovered when the sectors 5 wear beyond the predet
REFERENCES:
patent: 4115857 (1978-09-01), Paneffi
patent: 4189873 (1980-02-01), Paneffi
patent: 5044126 (1991-09-01), Baldo
patent: 5086591 (1992-02-01), Paneffi
patent: 5134808 (1992-08-01), Paneffi
Loram Maintenance of Way, Inc.
Rachuba M.
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