Gear cutting – milling – or planing – Milling – With means to dampen vibration
Patent
1993-11-30
1995-01-17
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With means to dampen vibration
408143, B23B 3102
Patent
active
053821220
DESCRIPTION:
BRIEF SUMMARY
P BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
This invention relates to the area of cutting and machining and more particularly to milling tools and the like intended to be fixed at a tool holder for inside machining of a work piece and preferably for cutting tools including a holder device displaceably arranged relatively to the axis of rotation.
2. Description of the Prior Art
Tools and arrangements of the kind mentioned above having the position of the tool or the tool holder radially offset and thereby unbalanced exist in connection with various cutting techniques, especially in milling or arboring machines and the like where a rotatable tool holder carries a tool and the tool is fastened in such a way that the center of gravity will be offset from the axis of rotation. In slowly turning machines, the relatively small weight of the tool has no negative influence on the machine as a whole. In the majority of cases, two tools are used and allowed to balance each other.
In high speed machines of the kind used more and more today and especially in machines having one single tool, problems arise. Many such machines are placed on shoes or pads, i.e. fasteners having vibration dampings bodies of rubber or similar material, and it has been found that, if an unbalanced tool is used in such a machine, the whole machine may start vibrating which can negatively effect the resulting work. As a consequence, the user may have to refrain from utilizing the machine at high speed.
Earlier double or triple mounted tools cannot be used in precision machining where it is intended to use cutting inserts of the types most in demand today as such tools would require complicated relative adjustment. It is also not possible to use standard inserts and tool holders for double mounting arrangements and the result will be that the speed must be kept low if vibration is to be avoided and standard parts are to be used.
An object of the present invention is to bring about an arrangement eliminating the above mentioned drawbacks resulting from nonsymmetrical mounting of rotating tools and tool holders in milling machines, arboring machines, drilling machines and the like and making it possible to use in a practical way replaceable inserts of modern design which allow high yield and simultaneously give a high quality result.
SUMMARY OF THE INVENTION
In a milling spindle or shaft of the milling head and tool holder the vibration problems occur because the tool with its cutting insert are not correctly balanced in radial direction. The vibrations and unbalance bring the whole machine into a state of resonance vibration and this is more prevalent if the machine is supported by elastic pads. If the machine is firmly secured by bolts directly to the foundation or to a floor, the vibrations may seem to be less intense but the machine nevertheless will be affected negatively. Additionally, there may be discomfort for the operator.
According to the invention, the problem is solved by attaching to the tool holder in an appropriate position a carrier means adapted to receive one or more weights of appropriate sizes and by arranging the weight or weights to be radially adjustably attachable to the weight carrier means.
BRIEF DESCRIPTION OF THE DRAWING
One embodiment of the device according to the invention will be described with reference to the attached drawing, in which:
FIG. 1 is a side elevational view showing a portion of a tool holder to be attached to a milling machine shaft, said holder presenting the device according to the invention,
FIGS. 2 and 3 are a longitudinal sectional view and an end view, respectively, of a weight holder used in the present invention, and
FIG. 4 is a longitudinal sectional view of a weight.
DETAILED DESCRIPTION OF THE INVENTION
A tool holder part 1 has an end face 2 presenting a recess 3 for receiving a wedge (not shown) adapted to fit into and be secured to corresponding details of a machine (not shown), i.e. an end milling arbor or the like. The tool holder part 1 includes an inn
REFERENCES:
patent: 3180187 (1965-04-01), McFerren
patent: 4599769 (1986-07-01), Latzko
patent: 4648763 (1987-03-01), Safranek
patent: 4899628 (1990-02-01), Seichter
Howell Daniel W.
Mircona AB
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