Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Patent
1998-04-02
1999-11-09
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
408144, 408226, 408227, B23B 5102
Patent
active
059801662
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rotary tool with a shank, such as a drill for drilling a hole in a workpiece made of wood, synthetic resin or metal, and an endmill for traverse feeding after a drilling operation, the rotary tool having a small-diameter hole (narrow hole) formed as a passage for air, oil or similar fluids for the purpose of lubrication, cooling, or chip ejection.
BACKGROUND OF THE INVENTION
Conventionally, as shown in FIG. 17, a rotary tool with a shank of this type has been available, for example, as a drill 60 having narrow holes 69. The drill 60 includes a shank 61 and a body 62. The body 62 has a neck 63, grooves 64 and a tip 65. The shank 61 has an inlet port 66 formed for introducing fluids at the end face thereof and extending a predetermined length along its rotational axis. Two narrow holes 69 are formed in communication with the inlet port 66 and extend through two lands 68 respectively at a corresponding helix angle thereof. The holes 69 lead to a flank 70 of the tip 65, so that fluids are supplied to the tip 65.
However, as for the tool material, hard materials such as cemented carbide are used, which makes it difficult to form helical holes 69 therein and thus makes such a tool expensive. In addition, in manufacturing drills with inverse or different helix angles, it is required to provide drill materials having the holes 69 formed at a helix angle corresponding to that of the respective drills. Further, it had not been found to be feasible to make only the tip 65, which is subject to wear, with a tip material of hard material and make the remaining body 62 and the shank 61 with low-cost steel, because it is difficult to join the tip material to the body 62 with the associated holes 69 aligned to each other and without the holes 69 becoming clogged with brazing material. Further, for a tool in which the fluids are supplied from the end face of the shank 61, it has been impossible to provide the tool with a length adjusting screw.
DISCLOSURE OF THE INVENTION
It is, accordingly, an object of the present invention to solve the noted problems of the prior art rotary tools, and specifically to provide an inexpensive rotary tool with a shank which has a narrow hole formed therein, wherein it is feasible to make the tip, which is subject to wear, with a tip material of a durable hard material, such as cemented carbide, and to make the remaining part other than the tip with general steel, such that the parts can be joined together without causing the hole to be closed, and wherein the same tool materials can be used for making tools having different helix angles.
A further object is to provide a rotary tool with a shank in which fluids are supplied from the end face of the shank and which provides for length adjustment.
Specifically, the present invention provides a rotary tool with a shank, of a type having a narrow hole for supplying fluids into the tool, which comprises a tool body and a tip member joined to the tool body, the narrow hole starting at an inlet port positioned at an end surface or an outer peripheral surface of the shank to run along the axis of rotation of the tool up to a tip end of the tool body and communicating at the boundary of the tip member and the tool body with an outlet port which opens to the terminal ends of ejection grooves.
As a result, during the process of brazing the tip member to the body of the rotary tool, the possibility that molten brazing material may flow into the hole and close the same can be remarkably reduced. Thus, it is possible to use a tip material only for the minimum part of the tip as necessary, while using low cost general steel for the remaining body portion. Further, in this invention, the outlet port is open, in communication with the hole, to the joining surface of the drill body with the tip member and to the terminal ends of connecting ejection grooves which are continuous with chip ejection grooves of the drill body. Thus, there is no need to form a hole in the flank of the tip as was necessary in
REFERENCES:
patent: 2786373 (1957-03-01), Patton
patent: 2898786 (1959-08-01), Willingham
patent: 3040605 (1962-06-01), Andreasson
patent: 3045513 (1962-07-01), Andreasson
patent: 3085453 (1963-04-01), Mossberg
Fridman Lawrence G.
Howell Daniel W.
Kanefusa Corporation
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