Gear cutting – milling – or planing – Milling – Thread or helix generating
Reexamination Certificate
1999-03-08
2001-03-13
Howell, Daniel W. (Department: 3722)
Gear cutting, milling, or planing
Milling
Thread or helix generating
C407S053000, C408S022000, C408S026000, C408S211000, C408S222000, C408S224000, C408S230000, C408S713000
Reexamination Certificate
active
06200078
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a complex cutting-blade tool and to a machining method employing that complex cutting-blade tool, primarily for use in hole machining.
2. Description of the Related Art
When a through hole is formed in a piece of workpiece using a drill, burrs are produced at the exit of the through hole. It is also necessary in some cases to bevel both the entrance and exit of a through hole formed with the drill.
In Japanese Utility Model Application Laid-open No. 318149/1993 is disclosed art for using beveling and burr-removing cutting tools attached to a drill for removing the burrs from and beveling the exits of through holes opened with the drill and for beveling the entrances thereof. And in Japanese Utility Model Application Laid-open No. 63713/1993 is disclosed a cutting tool for beveling entrances and exits of through holes.
However, with the drills noted in the foregoing, the through hole exit burr removal and beveling process and the through hole entrance beveling process, done by causing the drill shank to revolve eccentrically about the machined hole, are separate processes. For that reason, the drill or tool is caused to revolve eccentrically about the machined hole to perform through hole exit burr removal and beveling, and then, subsequently, it is caused to revolve eccentrically about the machined hole to perform through hole entrance beveling. Thus, in order to perform beveling on the entrance side and beveling and burr removal on the exit side of one through hole, the same tool must perform the same movements twice, which requires a long time and is time-consuming.
Special tools for performing through hole entrance and exit beveling are disclosed in Japanese Patent Application Laid-open No. 24804/1980 and Japanese Patent Application Laid-open No. 14801/1986, but these tools can no longer be used once the height of the through hole (i.e. the thickness of the workpiece) has changed.
SUMMARY OF THE INVENTION
An object of the present invention is to facilitate the simultaneous implementation, in one process, of machined hole exit burr removal and beveling and machined hole entrance beveling, irrespective of the height of the machined hole (i.e. the thickness of the workpiece), by causing a complex cutting-blade tool to revolve eccentrically about the machined hole, thereby enhancing work efficiency.
In order to attain the object stated above, the complex cutting-blade tool according to the present invention comprises: a hole-opening cutting blade; a neck, in back of the hole-opening cutting blade, having an outer diameter smaller than the outer diameter of the hole-opening cutting blade; a hole exit burr removal and beveling cutting blade provided at the place of connection between the hole-opening cutting blade and the neck at an angle of inclination of 45° or an angle near thereto with respect to tool center axis; fixture, mounted on the neck, having securing means capable of being secured to the neck at any position in the length dimension thereof and to release that securing; and a hole entrance beveling cutting blade mounted on the fixture at an angle of inclination of 45° or an angle near thereto with respect to the tool center axis in a direction opposite to the inclination of the hole exit burr removal and beveling cutting blade.
When the complex cutting-blade tool according to the present invention is implemented, hole exit burr removal and beveling and hole entrance beveling can be performed continually and simultaneously, with one tool, without changing that tool. It is also possible to perform hole exit burr removal and beveling and hole entrance beveling using this complex cutting-blade tool automatically and with high efficiency by employing an NC, so that machining costs can be reduced. When necessary, moreover, an end mill function can be added, so that hole-related machining can be done at higher efficiency and lower cost. In particular, the present invention makes possible the automation of burr removal from parts having branching pipes added thereto, conventionally thought impossible. Another advantage is the capability of enhancing the general-purpose usefulness of hole entrance beveling tools.
REFERENCES:
patent: 4533285 (1985-08-01), Jorgensen
patent: 4564321 (1986-01-01), Kondo et al.
patent: 5035551 (1991-07-01), Neumann
patent: 5173013 (1992-12-01), Gorse et al.
patent: 5186584 (1993-02-01), Mueller et al.
patent: 5509761 (1996-04-01), Grossman et al.
patent: 55-24804 (1980-02-01), None
patent: 61-14810 (1986-01-01), None
patent: 5-31814 (1993-04-01), None
patent: 5-63713 (1993-08-01), None
Howell Daniel W.
Staas & Halsey , LLP
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