Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Patent
1986-10-14
1987-12-22
Bilinsky, Z. R.
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
279 1TS, 408240, B23C 526
Patent
active
047143894
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/DE86/0036 filed Feb. 5, 1986.
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a tool holder or the like of the type supported in the spindle of a machine tool.
Description of the Prior Art
A tool holder in the form of a cutter arbor, is known (German Pat. No. 1,900,080, which corresponds to U.S. Pat. No. 3,554,080), in which a main member located behind a seat for a conical sleeve is designed as a shank which is continuously cylindrical as far as its end. This shank extends into a cylindrical bored portion of the main spindle, which portion adjoins the tapered receiving part of the spindle at the rear. This cylindrical bored portion is less precisely machined than the tapered receiving part and is not intended to perform any centering or guiding functions with respect to the cutter arbor.
Such a cutter arbor, on account of the cylindrical shank, requires that the design of the spindle be correspondingly adapted, with a cylindrical bored portion behind the tapered receiving part. Compared to a conical body, the cylindrical shank of the arbor ensures less rigidity. Since in practice only one limited area of the arbor cutter can be firmly clamped, namely the part located at the transition point from the shank to the flange, while the end of the cylindrical shank is not intended to be centered or guided particularly, sufficient true rotation cannot be ensured.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to overcome the existing disadvantages and inadequacies and to provide a tool holder or the like of the type mentioned in the introduction, in which the connection between the shank portion and the main spindle has a greater degree of rigidity compared to the previously known design described and in which at the same time there is greater true rotation, the shank portion itself, moreover, not being subject to any notable loss of rigidity compared to otherwise conventional tool holders.
A further object is to achieve an especially efficient application of the flange portion against the front end face of a main spindle. Nevertheless, the tool holder must be as universally adaptable as possible, i.e. must not require a specially constructed main spindle, as is the case with the known design, but must be suitable for use with different cone systems or clamping systems, e.g. standardized designs of cones, either with or without end journals, and in particular it must also be suitable for use in machines with an automatic tool-changing system. Further objects of the invention will become apparent from the respective description of the invention and solutions of problems as illustrated.
According to the invention, a tool holder of the type mentioned in the introduction has, in the rear region of the shank portion, a second cylindrical guide for a second tapered ring which can be braced against an additional elastic bearing.
Such a tool holder is distinguished by a number of advantageous properties. The main member, at two points on the tapered receiving bore of the main spindle, is subject to a firm and precise clamping action in the region of its largest and smallest diameter, thereby ensuring a high degree of rigidity of the connection between the shank portion and the main spindle. The susceptibility to vibrations and the risk of chatter are reduced considerably. Since one tapered ring can be displaced or adjusted independently of the other one, this is achieved with a greater degree of reliability, it also being possible to compensate for tolerances or errors in the angle of taper of the receiving part of the main spindle. The required application of the flange of the tool holder against the front end face of the main spindle is ensured. Nevertheless, a high degree of true rotation is also achieved. The shank portion may be given the same dimensions as those found in conventional tools and therefore itself also has a high degree of rigidity.
REFERENCES:
patent: 3554080 (1971-01-01), Herrmann
Bilinsky Z. R.
J. Kuhn GmbH Co.
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