Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1988-03-17
1989-06-27
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51103TF, 51105SP, B24B 504
Patent
active
048416827
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of manufacturing profiled turned parts which are symmetric with respect to their longitudinal axis, whereby profiled turned parts which may include right- and left-facing normal faces can be produced from rods directly by grinding, without a necessity for a separate cutting-machining operation.
The invention also relates to a device for carrying out the above method of manufacturing profiled turned parts.
It is known to produce profiled turned parts which are axially symmetric with respect to their longitudinal axis by the method of machining rods (or bars) with a cutting tool. These rods are namely unhardened steel rods of round cross section. Turned parts produced in this manner, if they are to meet stringent requirements as to dimensional accuracy and axial symmetry, they must undergo hardening followed by grinding to dimensions.
This traditional technique, widely employed, e.g., in the clock industry and the fine machinery industry, has among its disadvantages the fact that relatively high rate of tool wear leads to a series of relatively large measurement deviations in the cut or lathed part, which deviations need to be corrected in the subsequent grinding operations. It has been sought to alleviate this known disadvantage by employing hard metal tools. However, there is another disadvantage which survives: In order to sharpen (regrind) the cutting tools, they must be removed from the cutting machine, re-mounted, and readjusted, which is time-consuming and adds to the cost of precision parts (which are already costly to manufacture). The dimensional differences in turned parts in a single production run may be so great that it will be difficult to grind the hardened or unhardened parts to proper dimensions, and the grinding wheel must be applied very slowly to the parts, particularly in the case of fine turned parts. This is because the rough dimensions differ so greatly from piece to piece. A consequence of this is that there may be substantial piece-to-piece differences in the time of the grinding operation (from beginning of grinding to sparking out, which latter is the point at which sparks cease); or there may be substantial differences in grinding depth from piece to piece, which can also be undesirable.
Accordingly, the underlying problem of the present invention is to devise a method and device which eliminate the disadvantages of the customary methods and devices for manufacturing turned parts, and produce economical, precision, axially symmetric profiled turned parts.
This problem is solved according to the invention by a method and by a device as set forth in the appended claims.
The invention enables high precision axially symmetric turned parts to be produced from rods or bars, solely by grinding. This has not been possible heretofore. Often, the invention will enable grinding to tolerance without any subsequent grinding step. Moreover, workpieces used may be of already hardened steel, thereby avoiding a subsequent hardening and regrinding to tolerance.
Additional advantages and details of the invention will be apparent from the following description and the associated drawings, in which the manufacture of a particularly difficult to produce precision part is described, which part has transverse shoulders, grooves, end faces, and the like.
FIG. 1 is a side view of the turned part, enlarged;
FIG. 2 is a schematic top view of the arrangement of a first part of the inventive device, wherewith a first operation in the inventive method of manufacture the turned part is being carried out;
FIG. 3 is a schematic top view of the arrangement of a second part of the inventive device, wherewith a second operation in the inventive method of manufacturing the turned part is being carried out; and
FIG. 4 is a schematic top view of an arrangement of the inventive device wherein the two parts of the device are combined, and the turned part is simultaneously ground by two profiled grinding discs.
FIG. 1 is an enlarged view of a turned part of a type which can be manufactur
REFERENCES:
patent: 3145508 (1964-08-01), Price
patent: 3881887 (1975-05-01), McMaster
Rachuba Maurina
Schmidt Frederick R.
Tschudin Werkzeugmaschinenfabrik
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