Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1995-05-18
1997-08-19
Rachuba, M.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
407 33, 407 40, 407 44, B23C 524
Patent
active
056581017
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a milling head, which are used preferably for peripheral milling.
Normally milling heads of this kind have soldered blades, that is the blades are supplied with soldered hard metal cutting elements. Such soldered blades have a series of disadvantages. For example, fractures can occur in the hard metal when grinding and reshaping. Furthermore, the grinding and reshaping is costly because combination hard metal grinding wheels are required for this.
A known milling head of the already known type does not have these disadvantages (EP 0 345 570 A1), because the blade plate is not soldered to the support plate, but rather only lies on this. In addition to the frictional force that occurs between the blade plate and the backing plate, because both are pressed together against the groove which accepts the edge by means of the pressure block, the blade plate is protected from a radial shifting relative to the backing plate by a groove running in parallel to the longitudinal axis of the carrier body, into which a ridge-shaped section of the material of the backing plate grips. Namely, the support plate can be adjusted radially to the outside together with blade plate tooth by tooth thanks to the toothed system on the back side of the support plate which engages in a toothed system in the edge of the groove, to achieve the original flight circle diameter again when resharpening. When resharpening, the backing plate must be correspondingly ground so that, when the blade plate can no longer be sharpened, the backing plate must also become unusable. It is disadvantageous in particular then that when one wishes to sharpen the blade plate and the support plate together, an expensive combination hard metal grinding wheel must be used provided that the blade plate consists of hard metal as is usual.
SUMMARY OF THE INVENTION
The invention has the task of creating a milling head that does not have the disadvantages of these known milling heads.
By providing the backing plate with a toothed system on the front side, whose teeth nm in parallel to the longitudinal axis of the carrier body, and because the blade plate has a toothed system, which can be engaged with the toothed system on the front of the support plate, the support plate no longer needs to be shifted radially outward for reshapening the blade plate. Rather the blade plate must only be radially displaced to the outside by a tooth of micro-toothed system. This simplifies the regrinding on a constant flight circle diameter, because only the hard metal of the blade plate needs to be ground, which can be accomplished with a normal hard metal grinding wheel. The support plate only needs to be shaped when it is manufactured, which is possible with a normal corundum disk and can be accomplished quickly. Since the support plate does not need to be reground, it remains completely functional and can be used together with a new blade plate. In contrast to milling heads with soldered blades the solution in the invention has the advantage that very hard varieties of hard metal that cannot be soldered can be used. Furthermore, the danger of creating fractures when grinding and reshaping no longer exists as with soldered blades. Since a hard metal grinding wheel can be used for resharpening, a far higher quality of grinding on the back of the blade plate is possible to achieve than when grinding with a combination grind stone. In a preferred illustrative form, the support plates and the flank of the groove which creates the face of the support plate have a means for an interlocking securing device for the support plate against any dislocation in the radial direction relative to the carrier plate. In this way it is also prevented that a preferably provided toothed system of the support plate and the groove edge be misused to be able to radially displace the support plate to the outside by one or more teeth.
An interlocking securing device against an axial shifting of the blade plate relative to the backing plate is advantage
REFERENCES:
patent: 1269378 (1918-06-01), Bunch
patent: 2207909 (1940-07-01), Besaw
patent: 2917097 (1959-12-01), Smith et al.
patent: 4078868 (1978-03-01), Erkfritz
patent: 4449556 (1984-05-01), Colton
patent: 4658875 (1987-04-01), Grabovac
patent: 5176191 (1993-01-01), Owens
Gebr. Leitz GmbH & Co.
Rachuba M.
Tsai Henry W. H.
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