Indexable insert for face or disc milling cutters, and a cutter

Details Indexable insert for face or disc milling cutters, and a cutter Indexable insert for face or disc milling cutters, and a cutter

1993-11-30

1995-10-03

Kisliuk, Bruce M.

Cutters, for shaping

Rotary cutting tool

Including holder having seat for inserted tool

407113, 407 53, 407 34, B23P 1528

Patent

active

054546710

DESCRIPTION:

BRIEF SUMMARY
In a first aspect, the present invention foresees a cutting insert intended for milling tools, e.g. facemills and side-and-facemills, comprising opposite upper and lower surfaces, of which at least the lower surface is substantially planar in order to provide a base surface that can be placed upon a corresponding support surface of the milling tool, mutually opposite first and second side surfaces and mutually opposite third and fourth side or gable surfaces, each of which forming a main cutting edge along the edge line distanced from the base surface, each main cutting edge at its opposite ends joining secondary cutting edges extending along said first and second side surfaces.
In a second aspect, the present invention foresees a milling tool provided with cutting inserts according to the invention.
Cutting inserts of the above described kind are in practice manufactured by form-pressing and sintering of an insert-forming powder of suitable composition, whereby the cutting insert obtains a specific geometrical basic form which is determined by the intended use. The cutting inserts can be delivered to the user directly in this basic form, i.e. without any final treatment, however the delivery is often made after at least one finishing treatment in the form of a so called peripheral grinding. At such a peripheral grinding utmostly thin layers of material are ground away, e.g. layers with a thickness of about 0,1 mm or less, primarily in connection with the cutting edges, i.e. on the side surfaces of the cutting insert, and in connection with the base surface, however not in connection with the upper surface. The purpose of this peripheral grinding is to confer to the insert very precise dimensions, in order to guarantee an absolutely correct positioning of the operative cutting edges when the cutting insert is mounted onto the milling tool. However, at such precision grinding the geometrical basic form of the cutting insert is not substantially altered.
At such milling tools as side-and-facemills, the periphery of the milling plate is equipped with cutting inserts of which every second protrudes from one side of the plate and every second protrudes from the opposite side of the plate, in order to achieve two plane, mutually parallel side surfaces in a groove in a workpiece, and usually a bottom surface perpendicular to the side surfaces, which bottom surface joins the side surfaces via rounded joints with more or less distinct radii. More specifically, the bottom surface of the groove is achieved by the main cutting edges of the cutting inserts, whereas the desired surface evenness of the side surfaces is accomplished by the secondary cutting edges, which extend perpendicularly to the main cutting edges, the radii between the bottom surface and the side surfaces being brought about by more or less distinctly rounded corners at the joints between the main and secondary cutting edges. The staggered or alternating positioning of the cutting inserts along the disk periphery has required that the inserts be formed in special left- and right-hand configurations in order to guarantee sufficient clearance between the groove side surfaces and the trailing part of the insert behind the secondary cutting edge. Because of this, the cutting inserts are often given a rhombic basic form, although they can also have a parallelepipedical basic form. This necessity of forming the cutting inserts in special left and right embodiments constitutes in practice a serious disadvantage, inter alia because of the simple reason that storage costs are doubled, and also because the work of replacing inserts is rendered more difficult since the operator has to keep the two types of inserts apart in two separate assortments.
One object of the present invention is to eliminate said disadvantage by avoiding the necessity of particular left and right cutting inserts. Thus, an important object of the invention in a first aspect is to create a uniform cutting insert which can be used on both sides of a side and facemill cutter as well as on e

REFERENCES:
patent: 4294565 (1981-10-01), Erkfritz
patent: 4699549 (1987-10-01), Shimomura et al.
patent: 4934880 (1990-06-01), Stashko
patent: 4946318 (1990-08-01), David et al.
patent: 5049011 (1991-09-01), Bohnet et al.

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