Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1988-09-23
1990-06-26
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
125 1101, 125 11B, 125 11BS, 125 1115, 125 1116, B24B 53053
Patent
active
049360515
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field Of The Invention
The invention relates to a method and device for trimming grinding wheels, advantageously by means of a diamond trimming wheel, on grinding machines. The invention also relates to a device for accomplishing the method.
2. Description Of The Prior Art
Customarily in the manufacturing of mechanical devices, particularly precision mechanical devices where it is desired to produce workpieces with fine dimensional tolerances and finely ground surfaces, the grinding step or steps is/are carried out on a grinding machine wherein the workpiece to be ground is held on a rotary table, disposed on the turning slide, between headstock and a tailstock. The turning slide is translatable along the longitudinal axis (Z-axis) of the grinding machine. In addition, the rotary table can be rotated with respect to the turning slide around a vertical axis (B-axis) of the grinding machine, such that the workpiece spinnably held along the axis defined by the headstock and tailstock (the C-axis) is three dimensionally positionable with respect to the grinding wheel, which wheel is spinnable around its own rotational axis (A-axis) and is translatable along an additional axis (X-axis). Customarily, on such a grinding machine, which advantageously is numerically controlled (NC), the trimming wheel for the grinding wheel is mounted on the rotary table, such that said trimming wheel can advantageously be spun around the aforementioned C-axis around which the workpiece is rotated. Because when the movable slide is rotated around the aforesaid B-axis (whereby the C-axis is rotated around the B-axis) the C-axis is rotated away from the longitudinal axis (Z-axis) of the grinding machine, the grinding line between the grinding wheel and the trimming wheel may be spatially positioned as desired. While this freedom can be advantageous, it carries the drawback that the relation between the G-T grinding line (grinding line between grinding wheel and trimming wheel) and the G-W grinding line (grinding line between grinding wheel and workpiece) is not (or not always) directly calculable and must be re-zeroed after each trimming step in order to accurately determine the new position of the G-W grinding line. In addition, the position of the trimming wheel, which wheel customarily remains mounted on the turning slide during the grinding of a workpiece, is rotated, with respect to the grinding wheel, by each rotation of the turning slide as well as by the zeroing of the C-axis; and this necessitates a new zeroing of the trimming wheel prior to each trimming step.
SUMMARY OF THE INVENTION
The underlying problem of the invention is to devise a method and a device whereby these drawbacks can be eliminated, and by the use of which one can more efficiently grind workpieces and trim grinding wheels than by the use of customary methods and devices. In addition, the invention should afford higher precision and quality of grinding.
These problems are solved according to the invention by the provision of a method of trimming grinding wheels by means of a trimming wheel, particularly on an NC grinding machine with a turning slide (1) translatable along the horizontal Z-axis, said machine further comprised of a rotary table (2) disposed on the slide (1), which table is swingable around the vertical B-axis and accommodates, on the horizontal C-axis, the workpiece (7) which is to be ground, and further comprised of a grinding wheel (10) which spins around the A-axis and is translatable along the X-axis; characterized in that a trimming wheel (12) is employed which is directly mounted on the turning slide (1) so as to be spinnable around an additional horizontal axis (the C'-axis) and swingable around an additional vertical axis (the B'-axis), and which has a separate drive (11); and by the provision of an apparatus for trimming grinding wheels on an NC grinding machine, comprised of a turning slide (1) translatable along the horizontal Z-axis, further comprised of a rotary table (2) disposed on the slide (
REFERENCES:
patent: 155052 (1874-09-01), Uhlinger
patent: 2641873 (1953-06-01), Haas
patent: 3079905 (1959-03-01), Catallo et al.
patent: 4443975 (1984-04-01), German et al.
patent: 4510716 (1985-04-01), German et al.
Schmidt Frederick R.
Shideler Blynn
Werkzeugmaschinenfabrik Tschudin
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