Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1987-09-02
1990-05-29
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116577, 51289R, 51105SP, B24B 4900
Patent
active
049284371
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method according to the preamble of claim 1, and to means of carrying out the method, according to the preamble to claim 6.
Computerized numerical control (CNC) grinding machines are increasingly employed because they can be programmed economically and relatively simply, whereby changes to the machine for grinding disparate parts are much simpler and faster than changes required for ordinary cylindrical grinding machines. In addition, CNC machines enable maximum precision and repeatability, within a series and between series.
It is, however, difficult and time consuming to grind workpieces with both cylindrical and conical regions with a CNC machine. In particular, it is difficult to adjust the longitudinal axis of the piece to be ground (so-called C axis) parallel to the grinding line (which corresponds to the longitudinal axis of the turning slide) (so-called Z axis) for the grinding of cylindrical pieces.
This problem is partially solved by a device according to Swiss Pat. No. 623,261 of the present Applicant. Said device still does not enable determination of the precise position of the longitudinal axis of the turning slide. As a result, the position of the longitudinal axis of the workpiece cannot be determined for further processing by the computer.
With known CNC cylindrical grinding machines it is also impossibly complex to calculate how the aforementioned C axis is shifted rotationally relative the B axis, which runs normal to the grinding line and the turning slide, or how the grinding wheel or turning slide must be moved to grind a cone into the cylindrical part of the workpiece at a predetermined location. The computer is not given the necessary reference quantities, and there is a shortage of required measuring and position-adjusting devices.
The underlying problem of the present invention is to devise a method and means of resolving these difficulties. In addition, the invention should contribute additional simplification in operation of cylindrical grinding machines, particularly those of the CNC type, and should enable automatic grinding of combined cylindrical and conical workpieces.
This problem is solved according to the invention by a method according to claim 1 and by means according to claim 6.
The inventive method, and an advantageous embodiment of the inventive means, will be described with reference to the drawings. The inventive means are presented as modifications to a known CNC cylindrical grinding machine.
FIG. 1 is a schematic top view indicating the relevant parts and axes of an ordinary cylindrical grinding machine;
FIG. 2 is a workpiece which is to be ground on said machine, which workpiece has a cylindrical and a conical part;
FIG. 3 is a schematic top view indicating the relevant parts and axes of a cylindrical grinding machine which is provided with the inventive means and is capable of grinding the workpiece of problems; and
FIG. 4 is a schematic side view of an advantageous embodiment of the inventive means, with various structural details omitted.
The three relevant parts of the machine (relevant as to the invention) are shown in FIG. 1. These are the grinding wheel 1, the turning slide 2, and the rotary table 3. The grinding wheel 1 is rotatable around an axis A, in the direction of rotation 1'. The axis A can be shifted linearly along axis X, in the direction of double arrow 1", to move the grinding wheel toward or away from the turning slide 2 as required. The turning slide 2 can be translated along its longitudinal axis, the Z axis, in the direction of double arrow 2'. The rotary table 3 is borne on the turning slide 2, and bears a pair of turning centers (4, 5) between which the workpiece 10 (FIG. 2) is compressively held for grinding. The longitudinal axis of the rotary table, the C axis, is identical with the longitudinal axis of the workpiece 10 undergoing grinding, and passes through the turning centers (4, 5). When the cylindrical part 10' of workpiece 10 is being ground, the C axis is disposed parallel to and, advantageously, ver
REFERENCES:
patent: 3664066 (1972-03-01), Clark
patent: 4115956 (1978-09-01), Huffman
patent: 4584795 (1986-04-01), Akabane
Patent Abstracts of Japan, Band 7, Nr. 179, (M-234)(1324) 8-1983.
Rachuba M.
Schmidt Frederick R.
Werkzeugmaschinenfabrik Tschudin
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