Abstract:
A cutting insert has an upper face and a lower face; a front side face portion and a back side face portion, the front and back side face portions connecting the upper face and the lower face; and a through-hole passing through the upper face and the lower face. A cutting edge is formed in the front side face portion, and the back side face portion is provided with a first inclined face and a second inclined face which are inclined forwardly at different angles, respectively, with respect to a plane normal to a rotational axis. The first inclined face is longer than the second inclined face so that the back side face portion has a non-symmetrical convex “V” shape.
Abstract:
This aims to provide a ball end mill capable of preventing the occurrence of a ‘pluck’ off a work face. The ball end mill (10) is equipped with two cutting edges (11 and 12) formed at its spherical tips. The rake face (11a) of the cutting edge (11) has its inner circumference end arranged at a position offset farther forward of a rotating direction than a spindle. The rake face (11a) of the cutting edge (11) has its inner circumference end arranged at a position protruding by a predetermined distance from the spindle to the opposite side of the cutting edge forming side in the radial direction. The portion of the cutting edge (11) from a connecting portion (11f), which is formed midway of a ridgeline (11c) or a boundary line between the rake face (11a) of the cutting edge (11) and a flank (11b), to the outer circumference end of the cutting edge (11) is a main cutting edge (11m). The portion of the cutting edge (11) from the connecting portion (11f) to the inner circumference end of the cutting edge (11) is an auxiliary cutting edge (11s). The connecting portion (11f) of the cutting edge (11) is the portion which protrudes the farthest in the cutting edge (11) to the tip side of the spindle in the axial direction. The cutting edge (12) is constituted like the cutting edge (11).
Abstract:
In the radius end mill, main gash faces has an angle of inclination with respect to an axis that is smaller than a twist angle of chip discharge flutes. The main gash faces are formed on inner circumferential sides of distal end portions of wall surfaces that face in a tool rotation direction of helically twisted chip discharge flutes, which is formed on an outer circumference of a distal end portion of a tool body that is rotated around the axis. End cutting edges are formed on a distal end of the main gash faces. Sub gash faces has an angle of inclination with respect to the axis that is greater than that of the main gash faces. The sub gash faces are formed on an outer circumferential side of the main gash faces such that they extend away via step portions from the main gash faces. In addition, corner cutting edges that have a protruding arc-shaped contour are formed to be continuous with an outer circumferential side of the end cutting edges extending from a distal end as far as an outer circumference of the sub gash faces.
Abstract:
A cutting insert holder has a lower clamping jaw resiliently connected to an upper clamping jaw. The upper clamping jaw is provided with two elongated spaced apart parallel grooves. The cutting insert is retained in the cutting insert holder by means of a screw which passes through a through bore in the upper jaw of the insert holder, through a through bore in the cutting insert and is threadingly engaged into a threaded bore in the lower clamping jaw. The two elongated ridges in the upper surface of the cutting insert cooperate with the two elongated parallel grooves in the lower surface of the upper clamping jaw.
Abstract:
A cutting tool for rotary machining operations comprising:a tool holder, a leading end thereof having a substantially rigid support jaw formed with an insert supporting seat having a jaw support surface and a pair of jaw abutment walls diverging from a jaw apex, and juxtaposed with respect to the support jaw, a resiliently displaceable clamping jaw having a jaw clamping surface juxtaposed with respect to the jaw support surface, the jaws defining between them an insert receiving slot and being formed with aligned screw receiving bores;the cutting insert having a cutting portion and an integrally formed body portion adapted to be received in the slot, and having insert clamping and support surfaces, the jaw apex constituting a jaw abutment apex and being disposed adjacent a leading end of the support jaw, a recess being formed in the body portion, diverging outwardly from the cutting portion and having side walls formed with insert apical and side abutting portions such that when the insert is supported by the insert supporting seat of the support jaw it is located in a predetermined position by respective abutment of the jaw abutment apex and walls against the insert apical and side abutting portions.
Abstract:
A ball nosed milling tool that includes a cutter plate having circular segmental cutting edges formed by chord-oriented shoulders inset into opposite faces of the plate. The shoulders form cutting faces that are acutely angled to the midplane of the plate, such that chips are directed away from the rotational axis of the cutter plate. The cutter plate is clamped within a slot in a supporting spindle by means of a threaded fastener that extends transversely through the plate and the spindle. A cylindrical shank portion of the fastener is oriented to exert a cam action on the surface of a hole in the cutter plate, such that the plate is firmly seated in the spindle slot.
Abstract:
A milling tool in which a circular cutter plate is located in a transverse slot formed in a rotary spindle. The circular plate has four chord-oriented shoulders inset into its side faces. A plate holder mechanism has a V-shaped edge configuration mated to two of the chord-oriented shoulders, such that the cutter plate is accurately and firmly located within the slotted portion of the spindle. The plate holder mechanism includes an axially extending post that fits into an axial hole in the spindle for accurately orienting the plate holder mechanism to the spindle.
Abstract:
A machine tool assembly formed as a shaft member having a cutter head assembly at an end thereof includes a pair of juxtaposed jaws defining a slot therebetween within which there is received a rotatable cutting tool. A T-shaped insert provided in the slot defines abutment surfaces for supporting and guiding the rotatable cutting tool, the T-shaped insert having a projection engaging into a transverse groove formed on the periphery of the rotatable cutting tool and a leg engaging into an axial bore of the shaft member, the leg abutting against a round key member located within a radial bore and adjustably engaged by a screw.
Abstract:
A cutting tool insert for precision radial machining comprises two cutting faces and is adapted to be fitted in the strap of a tool holder. Said insert consists of two opposed identical frustoconical portions having a common circular base forming the median plane of the disk of which the longitudinal median plane is aligned with the axis of rotation of the tool holder and intersects with the center of the common base circle. Each of said portions has a cutting face in the median plane which is disposed symmetrically on either side of said axis; the cutting faces are obtained by cutting the relevant frustoconical portions depthwise along the median plane and bound by an inclined plane. The disk may also be made of two separate, identical portions.
Abstract:
A ball-end mill includes arcuate cutting edges each extending from a tip end to a peripherally outermost point along a S shape curve when viewed from the front side, spirally-shaped, peripheral cutting edges each smoothly connected to each arcuate cutting edge, and a convex rake face of each arcuate cutting edge protruding forward in a rotation direction. Each arcuate cutting edge has a radial rake angle satisfying β