Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1994-12-22
1999-06-29
Pitts, Andrea L.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408231, 408713, B23B 5100
Patent
active
059158956
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rotary tool effective as a drilling and chamfering tool for drilling and chamfering in one common drill advancing movement, having a tool holder comprising a base body having a longitudinal axis and oppositely located ends. A drill is concentrically clamped in the base body relative to the longitudinal axis to project from one of the ends of the base body. A chamfering tool is located at the one end of the base body and includes a chamfer cutter having a tip displaceable toward the drill and into a region of a lateral free face of the drill.
Such a tool, known from DE-U-92 06 148 has a carriage on the end toward the drill of the base body clamping the drill shank, which is equipped with a cutter body for chamfering and can be displaced in respect to a lateral free face of the drill, as the support of a cutter body, which countersinks or chamfers the drill hole drilled by the drill during the advancing movement taking place in the axial direction of the drill. By means of this it is possible to produce such drilling and chamfering tools of any arbitrary drilling diameter, using standard drills. The chamfering tool or the chamfering cutter, which is to be combined with the drill, can be flexibly adapted to the working diameter of the drill because of the carriage-like advancement ability. In the process, drills with the same shank diameter can be clamped into one base body, however, the working diameter of the individual drill to be clamped into the same base body can deviate from the uniform shank diameter.
If in such a drilling and chamfering tool a standard drill with a working diameter A is replaced by a standard drill with another working diameter B, the chamfering tool must be adapted to the operating diameter of the new drill. This is accomplished by means of a carriage-like adjustability in respect to the base body. In the known tool of the type mentioned at the outset, this adjustment or advancing direction of the chamfering tool forms an acute angle with the drill axis. This means that the standard setting is changed by the advancing movement of the chamfering tool. This standard setting is the distance of the cutting tip of the chamfering tool from the drill tip. Thus, a change of the working diameter of the drill inevitably means a change of the standard setting. A new setting of the drill depth is therefore always required to keep the chamfering depth of the tool constant, following a change of diameter.
SUMMARY OF THE INVENTION
A contrast of the known tool, in accordance with the present invention, the chamfer cutter is displaced in a direction of adjustment extending at a right angle to the longitudinal axis. Thus the chamfering depth is kept constant even with a change of the working diameter of the drill and subsequent adjustment of the chamfer cutter body. In this case it is assumed that standard drills with the same shank diameter, but different working diameters, essentially have the same working length in the axial direction.
The invention further relates to a drilling and chamfering tool or a drilling-counterbore tool of the type mentioned at the outset, regardless of whether the advancing direction of the chamfering tool is right-angled in accordance with the invention or at an acute angle in accordance with the state of the art. Here the chamfering tool is clamped to the base body secure against oscillations and is embodied in such a way that the chip removal is not hampered. In this case the cutting tip of the chamfering tool, which has a comparatively narrow corner angle E of approximately 45.degree., is particularly critical. This is the angle between the main cutting edge, which determines the cone angle of the counterbore and which is at an angle of 45.degree. in respect to the drill axis or the drill hole axis, for example, and the minor cutting edge, which lies at the side of the lateral free face of the drill. The corner angle is in particular danger of breaking because of its acuteness. At best, it can be pressed slig
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Borschert Bernhard
Jager Horst
Krenzer Ulrich
Muller Gebhard
Schuffenhauer Michael
Kennametal Hertel AG Werkzeuge and Hartstoffe
Pitts Andrea L.
Spencer George H.
Tsai Henry W. H.
Voorhees Catherine M.
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