Abstract:
An insert for use in a ball nose end mill (1) is provided that includes an insert body (22) having a top wall (24), a bottom wall (28) and at least one arcuate side wall (30). An arcuate cutting edge (34) is defined at an intersection between the top and side walls that includes a plurality of sinusoidal undulations (36) for reducing cutting forces, and vibration, and enhancing the breaking and removal of chips removed from a workpiece (66) during a cutting operation. An end portion (67) of the insert crosses the axis of rotation (A) when the insert is mounted in the seat of an end mill body (3), and the undulations (36) reduce the considerable shear forces applied to the cutting edge (34) at this location. The cutting edge has a profile which follows the contour of a sphere to permit machining a rounded cut. The side wall (30) of the insert body includes an upper relief portion (44) disposed directly under the cutting edge, with a relief angle for preventing the undulations from making unwanted striations or tool marks in the sidewalls of the rounded cut.
Abstract:
A cermet comprises a ceramic component (e.g., WC) and a binder comprised of a major component (e.g., one or more of iron, nickel, cobalt, their mixtures, and their alloys) and at least one additive component (e.g., one or more of ruthenium, rhodium, palladium, osnium, iridium, and platinum) which imparts corrosion resistance to the cermet. Parts composed of this cermet include plungers for hyper compressors used in the corrosive environments generated during the manufacture of low density polyethylene (LDPE) or ethylene copolymers.
Abstract:
Methods for making, methods for using and articles comprising cermets, preferably cemented carbides and more preferably tungsten carbide, having at least two regions exhibiting at least one property that differs are discussed. Preferably, the cermets further exhibit a portion that is binder rich and which gradually or smoothly transitions to at least a second region. The multiple-region cermets are particularly useful in compressively loaded application wherein a tensile stress or fatigue limit might otherwise be excessive for monolithic articles. The cermets are manufactured by juxtaposing and densifying at least two powder blends having different properties (e.g., differential carbide grain size, differential carbide chemistry, differential binder content, differential binder chemistry, or any combination of the preceding). Preferably, a first region of the cermet comprises a first ceramic component and a prescribed binder content and a second region, juxtaposing or adjoining the first region, of the cermet comprises a second ceramic component and a second binder content less than the prescribed binder content. The multiple region cermets of the present invention may be used in materials processing technology including, for example, compression technology, extrusion, supercritical processing, chemical processing, materials processing, and ultrahigh pressure.
Abstract:
The indexable insert possesses two parallel cutting edges (12, 14) on opposite sides of an indexable insert body (10) in the form of a rectangular block. In the intermediately placed top surface (20) descending toward the center line (M) there is a chipbreaking structure comprising alternating projections (16) and recesses (18). These projections and recesses constitute a row, centered on the center line (M), of spherical-like chipbreaking bodies, between which concave chip guiding surfaces are formed. There results an even flow of chips with the formation of short chips, which are free of grooves and tears along the edges.
Abstract:
The present invention entails a self-locking mechanism (10) for locking a rotatable member such as screw, bolt, lock rod, etc. In the case of a lock rod (50) that secures a tool holder (126) within a tool block (122), the self-locking mechanism (10) of the present invention includes at least one cam surface (52) connected between the lock rod (50) and a rotating carrier (14) having at least one wedge surface (26). The rotating carrier (14), wedge surface (26), and cam surface (52) are shaped and disposed such that they can be rotated by a driver (16) in unison as the lock rod (50) is rotated between locked and unlocked positions. However, the rotating carrier (14), wedge surface (26) and cam surface (52) are disposed and shaped such that the cam surface (52) and wedge surface (26) will, under the influence of the lock rod, move to a wedged self-locking position after the lock rod (50) has assumed a locked position. The driver (16) is designed with respect to the rotating carrier (14), wedge surface (26), and cam surface (52) such that the driver (16) will rotate the cam surface (52) and wedge surface (26) with respect to each other such that they are moved from a wedged locked position and thereafter the rotating carrier (14), wedge surface (26), and cam surface (52) can be rotated in unison as the lock rod (50) itself is rotated from the locked position to the unlocked position.
Abstract:
A collet (10) is designed for a tool (200) having a cylindrical shank (202) and a square drive (204) at the rearward end of the cylindrical shank. The collet inludes a collet body (12) having a plurality of radially compressible collet segments (30). An axial bore (20) is formed in the collet body (12) for receiving the cylindrical shank (202) of the tool (200). The tool (200) is secured in the axial bore (20) by collapsing the collet segments (30) around the cylindrical shank (202) of the tool (200). A grip-forming slot (40) extends through a midsection (24) of the collet body (12) and communicates with the axial bore (20) so as to receive the square drive (204) of the tool (200) when the tool (200) is inserted into the axial bore (20). A pair of gripping surfaces (42) are formed on respective collet segments (30) on opposite sides of the grip-forming slot (40) for gripping opposed surfaces of the square drive (204) when the collet segments (30) are radially collapsed to prevent radial movement of the tool (200).
Abstract:
An apparatus and method for balancing a high speed rotary tool assembly (1) is provided. The apparatus includes a rotary tool holder (3) having an axis of rotation (11), a cutting tool retainer (13) in the rotary tool holder (3) having a lockring (23) that circumscribes the axis of rotation (11) of the holder (3), and a pair of axially spaced balancing rings (35a, 35b) for balancing the entire rotary tool assembly (1) which are rotatably mounted around bearing surfaces (37) circumscribing the lockring (23) so as to be angularly positionable around the axis of rotation (11) of the tool holder (3). In the method of the invention, the unbalance of the tool holder (3) and cutting tool (17) is determined, and then the rings (35a, 35b) are rotatably adjusted about the bearing surface (11) on lockring (23) to create an unbalance which cancels out the determined unbalance of the tool holder (3) assembly.
Abstract:
A ceramic material (10) for use as a cutting tool in the high speed machining of high temperature alloys and cast irons is provided with a composition of beta prime sialon (Si6-zAlzOzN8-2; where 1
Abstract:
A toolholder assembly and method is provided that comprises an adjustable nozzle assembly for redirecting a liquid coolant stream from a direction generally parallel or slightly oblique with respect to the axis of rotation of a workpiece (12) to a direction that is substantially orthogonal with respect to this axis. The nozzle assembly includes a threaded base on one end and a nozzle head (33) on the other, and the threaded base may be screwed into or out of a threaded opening in the toolholder body (3) which communicates with the original coolant passageway in order to adjust the nozzle head at both a desired angle (A) in a plane orthogonal to the axis of rotation of the workpiece, as well as at a desired point along this axis. The nozzle head projects a stream of coolant at the interface (20) between the cutting insert (8) and the workpiece regardless of the depth of the cut.
Abstract:
A universal turret system is provided and includes the capability of accommodating a wide range of multi-class tooling including manual tools (1), manual quick-change tools (2), semi or fully automatic tooling (3), and live or driven tooling (4). The universal turret system includes a plurality of tool adapters (79) with each adapter being mountable at any station on the turret disk and with each tool adapter being designed to receive or drive a specific tool from the multi-tool class.