Cutting by use of rotating axially moving tool – Tool-support with means to permit positioning of the tool... – Tool having stepped cutting edges
Patent
1997-03-20
1998-10-13
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool-support with means to permit positioning of the tool...
Tool having stepped cutting edges
408192, 408224, 408713, B23B 5100
Patent
active
058203184
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a drilling tool in first hand intended for drilling in metals, comprising a peripheral cutting insert mounted in an adjustable cartridge for adjusting the cutting diameter:, in accordance with claim 1.
For drills it is known to use cutting inserts of cemented carbide which are fastened on the drill by mechanical clamping arrangements. In accordance with a number of known constructions, the cutting inserts are first mounted in cartridges, which thereafter are mechanically and reversibly fastened in the drill. For instance, in U.S. Pat. No. 3,726,352 (& SE-C-347 673) such a construction is described, according to which the cutting diameter is adjusted by positioning the peripheral cartridge by means of two set screws. When the desired diameter has been attained, the cartridge is fixed by a special locking screw. Although this construction has functioned satisfactorily, experience over the years has revealed several inconveniences. The use of two set screws produces inaccuracies in the cutting diameter. Further, the range of adjustment is very narrow, more precisely in the order of magnitude of up to 0,1 mm. This depends on one hand on the fact that the locking screw is accomodated in a bored-up hole in the drill, the play between the wall of said hole and the locking screw determining the radial adjustment range of the cartridge, and on the other hand that it is not possible to co-adjust the support pads of the drill in relation with the peripheral cutting insert. A further disadvantage of this construction is that it is necessary to loosen the locking screw completely when it is desired to take away the cartridge from the drillhead.
A primary object of the present invention is to provide a drilling tool that makes possible a safer, simpler and more accurate adjustment of the cutting diameter than hitherto known drilling tools do.
A second object of the present invention is to simplify the detachment of the cartridges.
These and further objects have been attained by forming the peripheral cartridge of the drilling tool with a slot and a wedge in accordance with the characterizing clause of claim 1.
For illustrative but non-limiting purposes, the invention will now be further described with reference to the appended drawings, which show a preferred embodiment of the invention.
FIG. 1 shows a drilling tool according to the invention in a perspective view obliquely from above, one cartridge being shown in an exploded view.
FIG. 2 shows an exploded view of the peripheral insert seat of a drilling tool according to FIG. 1.
FIG. 3 shows a perspective view of the peripheral cartridge obliquely from above, as seen towards the radially inner side.
FIG. 4 shows a drilling tool according to the invention in a side view, partly in cross-section.
FIG. 5 shows a top view of the drilling tool according to FIG. 4.
FIG. 6 shows a support pad which suitably is included in the drilling tool according to the invention.
FIG. 7 shows a support pad seat in a drilling tool according to the invention.
In FIG. 1 a drilling tool according to the invention is generally designated by reference numeral 1. Suitably, the drilling tool is of ejector type but may advantageously be used generally at so called BTA-drilling. It comprises a crown or drillhead 2, a dimension adapter 3 and a shaft part 4. This shaft part is provided with an external thread 5 which is intended to be screwed into an outer holding tube (not shown) in a way known per se.
The illustrated drilling tool is equipped with three insert-carrying cartridges: a peripheral cartridge 6 with a peripheral cutting insert 7, an intermediate cartridge 8 with an intermediate cutting insert 9 and a central cartridge 10 with a central cutting insert 11. The peripheral cutting insert 7 produces the diameter in the hole of the machined workpiece. The adjacent central cutting insert 11 overlaps the central axis of the drill since no remaining core is desired. At rotation, the orbit of the cutting edge of the intermediate cutting insert 9 overlaps with the c
REFERENCES:
patent: 3726352 (1973-04-01), Olov Roos
patent: 4100983 (1978-07-01), Hermann et al.
patent: 4133399 (1979-01-01), Herrmann
patent: 4165947 (1979-08-01), Smids
patent: 4225274 (1980-09-01), Katz
Blomberg Torsten
Danielsson Ake
Howell Daniel W.
Sandvik AB
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