Woodworking – Rotary cutter – Having slotted bit seat
Patent
1997-10-24
1999-09-28
Bray, W. Donald
Woodworking
Rotary cutter
Having slotted bit seat
144218, 144241, 407 46, 407 47, 241294, B27G 1300
Patent
active
059571764
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a profiled cutter head having cutters which can be resharpened without changing the profile and trajectory, which cutter head has the features of the preamble of claim 1.
BRIEF DESCRIPTION OF THE INVENTION
In a known profiled cutter head of this kind (G 69 33 019), each cutter support is clamped by means of screws against the base of the recess accommodating it in the basic body. Radially inside the cutter fixed to the cutter support, the cutter support has a bead-like protrusion which engages deeper into a groove in the basic body the smaller the thickness of the cutter becomes owing to its being ground away on its front for the purpose of resharpening. As soon as the engagement in the groove is free from play, this positive lock allows at least some of the centrifugal forces acting on the cutter to be taken up and thus makes it possible to prevent an increase in the trajectory owing to centrifugal force. However, fitting of this kind is complicated in terms of production engineering. Moreover, the screws have to be tightened carefully.
OBJECT OF THE INVENTION
The object underlying the invention is to provide a profiled cutter head having cutters which can be resharpened without changing the profile and trajectory, which cutter head has advantages over the known profiled cutter heads of the type discussed and in particular can be realized without expensive construction means. This object is achieved by a profiled cutter head having the features of claim 1.
A profiled cutter head of this kind does not require any special fitting. The cutter support and the cutter fixed thereto are positioned without fitting measures exclusively by means of the flanks, which form the bearing surfaces for the transverse part of the foot of the cutter support, of the grooves provided in the basic body and by means of the frontal stop surface. A positive lock which is free from play is then present in the direction in which the centrifugal force and the cutting force act. A further significant advantage consists in the fact that the force of the setscrew or setscrews, like the centrifugal force, presses the cutter support with its cutter against the surfaces serving for positioning, for which reason the centrifugal force is unable to bring about any change in position. The cutter head is therefore able to withstand high dynamic loads. This contributes to cost-effective production. Resharpening is carried out on the front of the cutter and can therefore be performed in a simple manner. Furthermore, the tool according to the invention makes it possible to achieve high cutting rates, long total tool paths and an excellent cutting quality. The cutter material can be utilized virtually completely, so that there is no need to throw away valuable cutting material. Furthermore, the basic body can be reused. The same cutter supports can be used for various profiles. Due to the exchangeability of the cutter supports, a modular system is obtained. Tool geometries and cutting materials which are adapted to the material can therefore be used without problems. The chip space can be configured optimally, as a result of which the dust fraction produced during the machining of wood can be significantly reduced.
Due to the fact that precise positioning of the cutter is inevitably achieved during clamping of the cutter support, a tool change is easy to carry out. The play-free positioning of the cutter ensures a high degree of accuracy during repeat positioning. The basic body may optionally consist of steel or aluminium, aluminium leading to a lower residual imbalance and thus protecting the bearings of the mounting spindle of the machine. The fact that it is possible to select large axis angles for a low power consumption and that the rake angle can be adapted to the material contributes further to a low machine loading.
The play-free positive lock of the cutters results in a high level of safety for the user and a high level of operational reliability. The feed can take place mechani
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patent: 2874912 (1959-02-01), Sennholtz et al.
patent: 3146961 (1964-09-01), Putman, Jr.
patent: 3303356 (1967-02-01), Pinkowski
patent: 4826090 (1989-05-01), Orphall
patent: 4932813 (1990-06-01), Qvart
Bray W. Donald
Gebr. Leitz GmbH & Co.
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