Face-milling method and apparatus

Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool

Reexamination Certificate

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Details

C407S035000, C407S053000, C407S061000

Reexamination Certificate

active

06200072

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a tool and a cutting insert for face milling, and to a face-milling method. The insert includes two parallel side faces interconnected by an edge surface structure. The insert has four, five, or six cutting corners. Disposed at each of the corners is a pair of cutting edges comprising a minor cutting edge and a major cutting edge, wherein a minor cutting edge generates a surface on a workpiece during a milling operation.
PRIOR ART
Through British Patent 951,624 there is previously known a tool and an indexable cutting insert substantially of the above-captioned type, wherein the tool is provided such that both minor cutting edges in a respective cutting corner portion of the cutting insert come into engagement with the workpiece during the machining operation. This means that both minor cutting edges in the corner portion are worn simultaneously and therefore for example a tetragonal cutting insert can be indexed, at most, to eight positions (i.e., four positions on each side) having new cutting edges. U.S. Pat. No. 4,616,962 discloses a milling insert with four cutting edges.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a tool for face milling, wherein at least sixteen new cutting edges can be utilized.
Another object of the present invention is to provide a cutting insert for face milling, having cutting edges which makes utilization economically advantageous.
Still another object of the present invention is to provide a cutting insert according to an alternative embodiment which is developed for deflecting the chips in a direction which creates little contact surface, and subsequently a low friction, between the chip and the cutting insert.
These and other objects have been achieved by an indexable face-milling metal-cutting insert which comprises two substantially parallel side faces interconnected by an edge surface structure to define at least four, and not more than six, cutting corners. An intersection of the edge surface structure and the side face at each of the cutting corners forms a pair of minor cutting edges intersecting one another substantially at a bisector of the cutting corner to form an obtuse angle therebetween. An intersection of the edge surface structure and the side face at locations between adjacent ones of the cutting corners forms major cutting edges at both of the adjacent cutting corners. Each major cutting edge intersects an associated one of the minor cutting edges, whereby each major cutting edge and its associated minor cutting edge together define a cooperating pair of cutting edges. The insert is indexable to bring only one of the cooperating pairs at a time into cutting relationship with a workpiece, with the side face being operable as a chip surface, and the edge surface structure being operable as a clearance surface. There are two of the cooperating pairs at each of the cutting corners and the pairs are disposed on opposite sides of the corner bisector.
The invention also relates to a face milling tool which comprises a milling body defining a longitudinal axis and having a plurality of seats arranged around the axis. Indexable metal cutting inserts similar to the type described above are mounted in respective ones of the seats. Another aspect of the invention involves a face-milling method employing inserts similar to those described above.


REFERENCES:
patent: 3786541 (1974-01-01), Lundgren
patent: 4616962 (1986-10-01), Ushijima et al.
patent: 4934879 (1990-06-01), Van Barneveld
patent: 4971483 (1990-11-01), Kress et al.
patent: 4988242 (1991-01-01), Pettersson et al.
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patent: 5074720 (1991-12-01), Lozvist et al.
patent: 5199827 (1993-04-01), Pantzar
patent: 5282703 (1994-02-01), Itaba et al.
patent: 5525016 (1996-06-01), Paya et al.
patent: 5758994 (1998-06-01), Hintze et al.
patent: 5876160 (1999-03-01), Johnson
patent: 1260357 (1961-03-01), None
patent: 951 624 (1964-03-01), None
patent: WO98/07543 (1998-02-01), None
Article: “Wendeplattenfräser und Wendeplatten”, (1981) Seco Tools AB, Sweden.

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