Turning – Severing or cut-off – Interrelated means for tool infeed and circumrotation
Patent
1986-10-10
1988-09-13
Godici, Nicholas P.
Turning
Severing or cut-off
Interrelated means for tool infeed and circumrotation
407 83, 407 89, 407108, 407117, B23B 2900
Patent
active
047700750
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to metal working and, more particularly, it relates to cutting-off tools.
BACKGROUND ART
There is known in the art a composite cutting-off tool according to U.S.S.R. Inventor's Certificate No. 764,855 issued on Aug. 18, 1977 and published on Sept. 23, 1980. Said prior art tool comprises a holder and a disk cutter member with recesses provided on one of its end faces. The holder and the cutter member are interconnected by means of bushings, each having a projection made on one of its end faces and received in the respective one of the recesses provided on the end face of the cutter member, and wedge-and-screw mechanisms each of which is positioned in the opening of a respective bushing and interacts by the sloping surface of its wedge with the peripheral surface of the cutter member. The prior art tool may only be used to perform operations under conditions of low cutting forces when there occur no considerable bending moments acting upon the cutter member of the tool, in other words, the tool lacks proper rigidity. The low rigidity of the tool is due to the presence of a gap between the holder and bushing after securing the cutter member. The gap is caused by the fact that, in the course of securing the cutter member, the wedge-and-screw mechanism urges the bushing to self-align by turning about its axis.
SUMMARY OF THE INVENTION
The present invention is aimed at solving the problem of developing a cutting-off tool wherein a bushing joining together a cutter member and a holder would be designed such as to provide for a gapless joint and, thereby, increase the rigidity of the tool.
The problem set is solved owing to the fact that in a cutting-off tool comprising a holder and a disk cutter member with recesses provided on one of its end faces, said holder and cutter member being interconnected by means of bushings, each having a projection made on one of its end faces and received in the respective one of the recesses provided on the end face of the cutter member, and of wedge-and-screw mechanisms each of which is positioned in the space of a respective bushing and interacts by the sloping surface of its wedge with the peripheral surface of the cutter member, according to the present invention, each bushing has a longitudinal groove made thereon and leading out to the projection-bearing end face.
The provision of bushings with longitudinal grooves ensures a tight gapless fit of the bushings in the holder holes and, consequently, a higher rigidity of the cutting-off tool.
It is preferred that the outlet of the longitudinal groove be positioned between the bushing projection and axis. With such an arrangement of the groove, the latter divides the bushing into two parts of different rigidity, namely, a more rigid part which serves to support the wedge and a less rigid part which is more pliable and moves in a radial direction to ensure gapless mating of the bushing with the holder. The provision of longitudinal grooves on the bushings adds considerably to the rigidity of the cutting-off tool and, as a result, said tool may be used under conditions of substantial cutting forces and may have a longer working head.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood upon considering the following detailed description of an exemplary embodiment thereof to be taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a general (side) view of the cutting-off tool, according to the invention;
FIG. 2 is a section of one of the bushings taken along the line II--II (scaled up);
FIG. 3 shows a side elevational view of one of the bushings according to the present invention; and
FIG. 4 is a cross-sectional view of the bushing of FIG. 3, taken along line IV--IV thereof.
BEST MODE FOR CARRYING OUT THE INVENTION
The herein disclosed cutting-off tool comprises a holder 1 and a disk cutter member 2, attached to each other.
The cutter member 2 is fitted with four hard-alloy plates 3 and serves the function of the tool working
REFERENCES:
patent: 1042190 (1912-10-01), Binger
patent: 1584347 (1926-05-01), Armstrong
patent: 2335570 (1943-11-01), Montgomery
patent: 3245288 (1966-04-01), Fried
Godici Nicholas P.
Seidel Richard K.
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