Gear cutting – milling – or planing – Milling – With means to dampen vibration
Patent
1996-09-18
1998-09-22
Pitts, A. L.
Gear cutting, milling, or planing
Milling
With means to dampen vibration
74573R, 82903, 408143, 451343, B23C 900
Patent
active
058105271
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a rotary tool, in particular a high-speed milling or boring tool, in accordance with the preamble to the main claim.
Rotary tools with balancing rings of this type are disclosed, for example, in U.S. Pat. No. 5,263,995 or in U.S. Pat. No. 5,074,723. The disadvantage of such rotary tools comprising tools as well as tool holders, which operate at very high speeds, for example in the order of up to 20,000 revolutions per minute, is the problem of fine balancing of the tools and the tool holders. In accordance with the prior art, e.g. as represented through the two aforementioned U.S. patents, two balancing rings are disposed to this end on the circumference of the tool or the tool holder at an axial distance from each other. These balancing rings for the purpose of fine balancing are slidable with their inner circumference on the outer circumference of the rotary tool or the rotary tool holder in the circumferential direction and can be fixed in different rotating positions relative to the tool body or the tool holder body. In particular, this relative slidability of the balancing rings in relation to the tool body or the tool holder body is continuously variable.
The balancing rings for fine balancing are provided with a variable mass around their circumference. This is most easily attained by boring through the balancing rings in certain circumferential areas. For example, these could be bore holes running parallel to the axis of rotation of the tool or the tool holder, whereby a reduction in mass can be attained in the affected circumferential area of the balancing ring in question.
The balancing of kinetic energy, i.e. the fine balancing, is then achieved through the fact that at least one of the balancing rings, preferably however both rings are moved to a rotating position in relation to the tool or the tool holder and are fixed in this position at which the balancing of kinetic energy is at its desired fineness.
The constructive design of the carrier body--whether this is the tool body or the tool holder body--in accordance with the prior art has the disadvantage that, during operation, the balancing rings are subject to considerable centrifugal forces as a result of the high speeds and are thereby weakened in their cross-section and could burst in the area of the bore holes in the balancing rings as well as in the area of the clamping elements designed for fixing the balancing rings. A further disadvantage of the known embodiments is the fact that the balancing rings lying adjacent to each other in the axial direction of the tool or the tool holder require a certain face-to-face length, which leads to an increase in the overall length of the tool body or the tool holder body in the axial direction.
The object of the present invention is therefore to further develop a rotary tool, in particular a high-speed cutting or boring tool, of the type mentioned at the beginning to such an extent that a shorter overall length of the entire system formed by the tool holder as well as the tool itself can be attained through a space-saving arrangement of the balancing rings. Furthermore, the present invention aims to support the balancing rings at least partially on their outer circumference such as to reduce to a large extent, if not, completely rule out the risk of damaging the balancing rings and thereby also the tool through the high centrifugal forces occurring while the tool is in operation.
This object is attained through the rotary tool in accordance with the invention which is embodied according to the characteristic features of the main claim. The fact that two balancing rings are concentric to each other and thereby are normally disposed on a common level to the axis of rotation of the tool or the tool holder results in a short overall design of the entire system formed by the tool and the tool holder. Since the balancing rings are disposed within each other, they can support each other in a radial direction. The invention also provides for the balancing rings themselves
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patent: 5555144 (1996-09-01), Wood et al.
Jager Horst
Muller Gebhard
Kennametal Hertal AG
Kirkman Christopher
Pitts A. L.
Prizzi John J.
Vasuta John M.
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