Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Reexamination Certificate
1999-08-13
2001-05-01
Tsai, Henry (Department: 3722)
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
C407S049000, C407S061000, C407S063000
Reexamination Certificate
active
06224299
ABSTRACT:
BACKGROUND OF INVENTION
Known prior art such as U.S. Pat. No. 3,672,017 to Nielsen et al. and U.S. Pat. No. 4,472,093 to Hamilton disclose tools having curved cutting inserts and scalloped cutting inserts. Such inserts have the following draw backs:
a)difficult to make,
b) because of the curvatures it is difficult to evenly wedge the insert in the associated tool thus resulting in uneven forces and pressures on the insert which results in breakage and a shortened insert life, and
c) the inserts have to be ground while in the operating tool; the inserts can not be taken out of the operating tool, ground and then replaced.
Another patent of interest with respect to the inventive concept is U.S. Pat. No. 5,325,748 to Ehrenberg which discloses a tool having one single straight bar cutting insert offset from the longitudinally axis of the tool to provide a helical cutting action. The Ehrenberg tools provide a single cutting action during rotation of the tool. For high speed operations, it has been found necessary to have a milling tool with a number of cutting inserts or blades on its periphery. For example, the inventive tool is operable at 22,000 rpm while the single insert Ehrenberg tool can not be satisfactorily operated above 13,000 rpm. One reason for this is that in the Ehrenberg tool a single off-center insert is mounted on the periphery of the tool, and therefore the tool is not balanced. Further, the structure of the Ehrenberg can not provide even two cutting inserts, since any additional inserts mounted on the tool would destroy the tool shank.
SUMMARY OF THE INVENTION
The present invention discloses a rotatable tool having straight elongated inserts for cutting in an efficient helical mode, and having means for providing coolant at a high pressure to the cutting edge of the inserts. The inventive tool has a plurality of grooves or slots, and the slots have flat bottom surfaces parallel to the axis of the tool for receiving the cutting inserts. The inserts are elongated, substantially rectangular, straight members and include a cutting edge and surface. Each of the inserts is secured in a respective slot by one or more suitable wedges. In one embodiment, apertures are formed in the wedges securing the inserts, and liquid coolant at a high pressure is forced through said apertures to impinge on the cutting edges of the inserts and the material being cut.
The foregoing features and advantages of the present invention will be apparent from the following more particular description of the invention. The accompanying drawings, listed herein below, are useful in explaining the invention.
REFERENCES:
patent: 2567167 (1951-09-01), Drader
patent: 3461748 (1969-08-01), Meyer
patent: 3561297 (1971-02-01), Wilkins
patent: 3672017 (1972-06-01), Nielsen et al.
patent: 4400117 (1983-08-01), Smith
patent: 4472093 (1984-09-01), Hamilton
patent: 4764059 (1988-08-01), Wale
patent: 5112162 (1992-05-01), Hartford et al.
patent: 5325748 (1994-07-01), Ehrenberg
Frecska Laszlo
Hartford James T.
Aubel Leo J.
Tsai Henry
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