Stone working – Turning – Grinding-wheel dressing
Patent
1993-10-21
1996-07-16
Rose, Robert A.
Stone working
Turning
Grinding-wheel dressing
125 39, B24B 5304
Patent
active
055357326
DESCRIPTION:
BRIEF SUMMARY
The invention concerns diamond-studded tools, especially those for dressing grinders.
For this purpose use is generally made of tools with diamonds, especially tools having a shank on which a roller can rotate around an axis orthogonal to that of said shank, said roller having a certain number of diamonds lodged in its cylindrical surface at equidistant radial positions.
When a diamond becomes worn down it is replaced with another by rotating the roller after loosening a central screw which is tightened again afterwards. FIGS. 22 and 23 illustrate one of these tools, with diamonds 129 and 130.
It is known that the tool 120 is most effective when the ZZ axis of the operating diamond 130, coinciding with the XX axis of the shank 122, intersects the KK axis of rotation of the grinder 90.
But frequently this optimum set-up is interfered with by errors in angular set of the roller 121 which can lead to incorrect setting, at 130', of the diamond 130 moving it to D, distant from the XX axis of the shank that intersects the KK axis of the grinder 90.
Further, since the roller's rotation axis YY is substantially parallel to the grinder's rotation axis KK, due to moments of force set up by the grinder itself, considerable stresses are created on the diametrical edges 131 132, of the seat holding the operating diamond 130,aligned on an arc of the cylindrical surface of said roller 121.
Since, due to curvature of the roller 121, said edges lie farthest from the point of the diamond 130, said diamond becomes easily loosened and dislodged.
As the axis of the roller is parallel to that of the grinder 90, the forces set up by the grinder are exerted tangentially on said roller 121 and tend to make it rotate; further, as the point of the diamond 130 lies at a considerable distance from the roller's axis, there is much vibration in the tool during its work which adversely affects its stability and operational accuracy.
The above invention eliminates these drawbacks and also offers other advantages as will be explained below. Subject of the invention is a diamond-studded tool, for dressing grinders, rotating on the shank of a support round an axis that obliquely intersects the axis of the shank. The operative areas with diamonds are spread over a geometrical conical surface or over planes tangential to said surface.
The best effects are achieved when the geometrical conical surface so tapers that the plane, on which lie the axis of rotation and that of the shank, intersects the operative areas according to a straight line practically orthogonal to the axis of the shank.
It is an advantage if obliquity of the axis of rotation with respect to the axis of the shank is practically 45.degree. and, similarly, if tapering of the geometrical conical surface is about 90.degree..
The flat operative areas may be arranged, as the case may be, on the conical surface at an equal angular distance, or be spread in a continuous manner over said conical surface.
Said operative areas may be all equal or may be wholly or partially different, and may comprise one or more diamonds preferably on lines coinciding with the radius of the geometrical conical surface or on lines parallel to said radius.
The points of the diamonds are placed along geometrical flat surfaces at tangents to the geometrical conical surface or else are placed along said surface. Geometrical form of the operative areas may vary and may especially be rectangular, square, circular.
In other executions the operative areas are made from a compound composed of a powder of diamonds and of sintered metal.
By means of special devices the tool may rotate freely and may be locked as desired either in any angular position or at intersection, according to a line orthogonal to the axis of the shank, of one or other operative areas with the plane on which lie the axes of rotation and of the shank.
In this way a worn area may be replaced with a fresh one or an area of one kind with another of a different kind. The advantages of the invention are clear.
The diametrical edges of the seats hol
REFERENCES:
patent: 2324942 (1943-07-01), Meeson et al.
patent: 2353236 (1944-07-01), Hammill et al.
patent: 2380451 (1945-07-01), Koebel
patent: 2462716 (1949-02-01), Booth
Redis S.r.l.
Rose Robert A.
Striker Michael J.
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