Turning – Lathe – Tool rest
Patent
1992-02-04
1993-08-24
Bilinsky, Z. R.
Turning
Lathe
Tool rest
279 208, 279 403, 408239A, 409234, B23B 2900
Patent
active
052378950
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tool holder. The holder forms a part of a finishing machine and constitutes a holder for a machining tool such as a lathe shaft. In the finishing machine the holder is secured to a tool attachment which may either be a permanent fixture or located on a unit containing several tool holders, thus enabling several machining operations to be performed one after the other. It is often necessary for the machining tool to be rather long in order to permit machining inside the cavity of a work piece. If the machining tool is long there is considerably risk of it being subjected to vibration, and the quality of machining is therefore deteriorated. Several attempts have been made to reduce vibration. The tool shaft has, for instance, been arranged in a cradle and several screw joints have then been arranged along the shaft in order to press it against the cradle. However, the vibration has not been reduced to the desired extent and wear has also been caused at the orifice of the holder, thus giving rise to further vibration. The problem of vibration is troublesome, as is evident from Sandvik Coromant's publication entitled "Lathing with dampening lathe shafts" HV-5300:008-SWE.
The object of the present invention is to reduce the undesired vibration in long machining tools. According to the invention this is enabled by replacing mechanical attachment means with a hydraulic retaining arrangement wherein a tool holder is provided with an aperture to receive the shaft of a machining tool. Inside the aperture wall a tubular cavity is arranged which can be filled with a medium such as grease or oil. If said medium is subjected to pressure the wall of the aperture will be pressed radially inwards, thus clamping the shaft of the machining tool with an extremely considerable force. This force exceeds the forces which can be achieved by mechanical means. Inner sleeves or bushings having the same outer diameter as the inner diameter of the aperture can be inserted in said aperture so that the tool holder can be used for machining tools of different thicknesses.
According to a suitable embodiment of the present invention a bushing is prepared having a through-hold and a tubular part. An annular space of the above-mentioned type is arranged in the bushing and inside the aperture wall. The sleeve is inserted into the holder aperture and the medium in the annular cavity is then subjected to pressure so that the tool is clamped, as well as the outer wall of the sleeve being clamped against the aperture wall of the holder.
Additional characteristics of the present invention are revealed in the following claims.
The present invention will be described in more detail with reference to the accompanying drawings in which
FIG. 1 shows an end view of a sleeve intended for insertion into the aperture in the tool holder,
FIG. 2 shows the sleeve seen from the side,
FIG. 3 shows the sleeve during insertion into the tool holder, and
FIG. 4 shows a tool holder together with a machining tool in function.
FIGS. 1 and 2 show a sleeve or a bushing 1 having a tubular part 2 and an annular end portion 3. The sleeve is provided with a tubular cavity 4 communicating with a pipe 5 for the supply of medium. The inlet is connected to a means 6 for adjusting the pressure in the medium located in the cavity 4. The pressure is adjusted by means of a screw which can be screwed in or out, thus adjusting the pressure. The inner sleeve or bushing shown in FIGS. 1 and 2 is designed for insertion into a tool holder 7, i.e. into the aperture 8 running through the tool holder 7. The tool holder is secured to a tool attachment 9 which may either be a permanent, immovable fixture or may be fitted on a movable member provided with several machining tools. In FIG. 4 the inner sleeve or bushing is fully inserted into the tool holder 7. A lathe shaft 10 is also inserted into the aperture in the inner sleeve or bushing. The device 6 is now actuated, and the lathe shaft 10 is thus subjected to an inwardly directed pressure which may be in
REFERENCES:
patent: 3378902 (1968-04-01), Hoexter
patent: 3388917 (1968-06-01), Winnen et al.
patent: 3592482 (1971-07-01), Better
patent: 4111569 (1978-09-01), Mengel
patent: 4244248 (1981-01-01), Adell et al.
Bilinsky Z. R.
Spirex Tools AB
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