Electric heating – Metal heating – Cutting or disintegrating
Patent
1991-09-03
1993-08-17
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
403 14, 403330, B23H 104, B23H 726
Patent
active
052371468
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for fastening an article, disposed at an end of a cylindrical shaft portion, to one coupling member of a coupling means whose other coupling member is anchored at a machine tool, especially a die sinking electric discharge machine, the one coupling member comprising a bore to take up the shaft portion.
The applicant's earlier German patent application DE-P 37 06 123 discloses a device for connecting a shaft which carries a sinker electrode to a coupling member which is anchored at a machine tool, especially a die sinking spark erosion machine, and has a conical recess converging from the opening toward the coupling face.
A split insert bushing is provided within the recess and has its inner surface adapted to the outer contour of the shaft so as to press together the coupling member and the shaft.
Furthermore, a fastening means for tools in spark erosion machinery is known from DE-PS 26 46 951. Here, a shaft to be clamped in a chuck is provided with a radially projecting pin which is adapted to be pressed by a spring loaded tensioning member against the end face of the take-up part of the shaft and against a bolt protruding from the take-up part in parallel with the shaft.
The abutment of the pin against the end face of the chuck provides fixation in height and the abutment of the pin against the bolt fixes the angular position. This fastening means, however, has the disadvantage that, for abutment and fixation in height, the pin must be fitted on the shaft, i.e. must be shrunk and/or secured by a grub screw, in other words mounted on the shaft as an additional component part. Furthermore, in that case the electrode is soldered to the shaft and that is expensive in terms of work to be done and further results in the electrode becoming loose from the shaft upon heating.
SUMMARY OF THE INVENTION
It is the object of the invention to warrant simple handling of the article to be fastened by the chuck and shaft in a device of the generic kind specified and, at the same time, provide high repetition accuracy without the influence of manual contact pressures. Moreover, production of the device is to be simple and inexpensive.
This object is met, with a device of the kind defined in claim 1. Advantageous modifications and further developments of the invention are to be gathered from the dependent claims.
The solution of the invention makes it possible to use sinker electrodes which are fixed on standard shafts, partly in exchange. The electrodes can be replaced in a simple way and within a short time. It is particularly advantageous that the expensive fixing by soldering of the electrode on the shaft end is dispensed with.
The fixing portion being an integral component of the intermediate piece by being molded as part of the shaft thereof, additional parts can be avoided which usually give rise to further inaccuracies in the setting and fastening of the shaft for being mounted at the job site.
The molding of the fixing portion as an integral component of the intermediate piece further permits cost reduction in the manufacture of the shaft portion as the necessary shafts are produced by die casting and but one die is needed for the intermediate piece according to the invention that includes the shaft.
In view of the fact that the bushing is designed as a single piece, the tools can be mounted rapidly and firmly at the hollow cylindrical end of the shaft and can be exchanged just as easily. The interlocking provides precise and reproducible contact pressure between the take-up sleeve and the intermediate piece and this contact pressure is totally independent of any manual contact pressures exerted upon introducing the intermediate piece into the take-up sleeve. This also improves and guarantees the repetition accuracy.
With a preferred embodiment, the fixing portion of the intermediate piece has a curved configuration with a curvature at one side, with another embodiment it has an angular cross section. The end face of the wall of the take-up sleeve of
REFERENCES:
patent: 3625554 (1971-12-01), Mottais et al.
patent: 4879930 (1989-11-01), Von Haas
Buchler B-Set AG
Evans Geoffrey S.
LandOfFree
Device for fastening an article, disposed at an end of a cylindr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for fastening an article, disposed at an end of a cylindr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for fastening an article, disposed at an end of a cylindr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2245857