Abstract:
A toolholder (1) of the type including a collet (5) integrally formed with a shank (3) is provided with an interface between a locknut (7) and collet (13) which substantially reduces the torque required to turn the locknut (7) into a position which radially collapses the collet segments (17). In this interface, one of either the inner locknut surface (23) or the outer surfaces of the collet segments (17) includes an engaging portion (56) for wedgingly flexing the collet segments (17) inwardly when the locknut is turned, and a non-engaging portion (58) disposed between the engaging portion (56) and the shank mounted ends of the collet segments (17). The non-engaging portion (58) reduces the torque required to turn the locknut (7) by reducing the binding forces that would otherwise occur between the ends of the collet segments (17) and the inner locknut surface (23). To further reduce torque, the collet portion interconnecting the collet segments (17) with the shank (3) of the toolholder is rendered thinner by the provision of circumferential grooves (72, 76) that make the collet segments (17) more flexible. Sealing rings (66, 74, 81) are seated in grooves (68, 72, 76) present in the interior defined by the collet segments (17) in order to prevent errant flows of coolant or debris from collecting between the collet segments (17) and the tool shank (9) gripped thereby.
Abstract:
A rotary tool connecting assembly (1) comprises an adapter receiver (15) for receiving and securing a tap (4), a chuck body (2) having one end which is detachably connectable to the spindle (3), and an opposing end having an axially aligned recess (9) for slidably receiving the adapter receiver (15), and a mechanism for transmitting torque from the chuck body (2) to the adapter receiver (15) while allowing the receiver (15) to freely axially slide within the recess (9) of the chuck body (2) that includes a plurality of linear roller bearings (107 a, b, c) disposed between a single flat wall (99) present on the side of the receiver (15) and a flat bearing wall (101) that defines a portion of the recess (9) in the chuck body (2).
Abstract:
The present invention is a tool holder for receiving an endmill or similar tool. The tool holder includes a shank portion (14) adapted to fit into the spindle of a machine, and a closed end collet (16) integrally formed with the shank portion. The collet includes an axial bore (30) for receiving the tool and a plurality of resilient collet segments (34) for gripping the tool. The collet segments are separated by a plurality of axially extending slots (32) which terminate inwardly from the forward end of a collet. A continuous tie ring (36) extends around the forward end of a collet and joins the plurality of collet segments together. The continuous tie ring provides for increased radial stiffness at the forward end of the collet which improves accuracy and repeatability of tool location. A lock nut (40) threads onto the collet to collapse the collet segments radially inwardly to grip the tool.
Abstract:
An angle spindle attachment for a vertically movable spindle unit (29) is provided for rotating a cutting tool (4) in a generally horizontal orientation. The attachment includes a spindle assembly (43) having a drive train (44) that is mechanically independent from the drive train of the vertically movable spindle unit, and a connector block for detachably connecting the spindle assembly at a transverse angle with respect to the vertically movable spindle unit. The connector block (105) may include an angular adjustment mechanism (107) that allows the spindle assembly to be oriented at an angle above or below the horizontal, as well as a rotational adjustment assembly that allows the spindle assembly (43) to be pivotally adjusted about the axis of rotation of the vertically movable spindle unit. The independent drive train of the spindle assembly may be either electrically, hydraulically, or pneumatically powered, and allows the cutting tool to be held more rigidly, operated with less eccentric movement, and turned at speeds that are not limited by the drive train of the vertically movable spindle unit.
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:
Dispositif de serrage (10) utilisé pour serrer un contre-écrou (165) sur un mandrin (150) comprenant un système d'affichage de torsion (240) destiné à mesurer la torsion appliquée pour serrer le contre-écrou. Le dispositif de serrage comprend un bloc de support fixe (12) dans lequel est monté rotatif un collier de transmission de torsion (40). Le collier de transmission de torsion est conçu pour recevoir et maintenir le mandrin de sorte que ce dernier est maintenu non rotatif par rapport au collier. Lorsqu'une torsion est appliquée pour serrer le contre-écrou sur le mandrin, ce dernier ainsi que le collier tournent de manière unitaire. Un indicateur de torsion (200) est monté dans le bloc fixe et réagit à la rotation du collier de transmission de torsion afin de fournir une indication de la torsion appliquée pour serrer le contre-écrou.
Abstract:
An angle spindle attachment for a vertically movable spindle unit (29) is provided for rotating a cutting tool (4) in a generally horizontal orientation. The attachment includes a spindle assembly (43) having a drive train (44) that is mechanically independent from the drive train of the vertically movable spindle unit, and a connector block for detachably connecting the spindle assembly at a transverse angle with respect to the vertically movable spindle unit. The connector block (105) may include an angular adjustment mechanism (107) that allows the spindle assembly to be oriented at an angle above or below the horizontal, as well as a rotational adjustment assembly that allows the spindle assembly (43) to be pivotally adjusted about the axis of rotation of the vertically movable spindle unit. The independent drive train of the spindle assembly may be either electrically, hydraulically, or pneumatically powered, and allows the cutting tool to be held more rigidly, operated with less eccentric movement, and turned at speeds that are not limited by the drive train of the vertically movable spindle unit.
Abstract:
A toolholder (1) of the type including a collet (5) integrally formed with a shank (3) is provided with an interface between a locknut (7) and collet (13) which substantially reduces the torque required to turn the locknut (7) into a position which radially collapses the collet segments (17). In this interface, one of either the inner locknut surface (23) or the outer surfaces of the collet segments (17) includes an engaging portion (56) for wedgingly flexing the collet segments (17) inwardly when the locknut is turned, and a non-engaging portion (58) disposed between the engaging portion (56) and the shank mounted ends of the collet segments (17). The non-engaging portion (58) reduces the torque required to turn the locknut (7) by reducing the binding forces that would otherwise occur between the ends of the collet segments (17) and the inner locknut surface (23). To further reduce torque, the collet portion interconnecting the collet segments (17) with the shank (3) of the toolholder is rendered thinner by the provision of circumferential grooves (72, 76) that make the collet segments (17) more flexible. Sealing rings (66, 74, 81) are seated in grooves (68, 72, 76) present in the interior defined by the collet segments (17) in order to prevent errant flows of coolant or debris from collecting between the collet segments (17) and the tool shank (9) gripped thereby.
Abstract:
A tightening fixture (10) for tightening a lock nut (165) on a chuck (150) including a torque readout device (240) for measuring the torque applied to tighten the lock nut. The tightening fixture includes a stationary support block (12) having a torque transmitting collar (40) rotatively mounted therein. The torque transmitting collar is designed to receive and hold the chuck so that the chuck is held nonrotatable with respect to the collar. When torque is applied to tighten the lock nut on the chuck, the chuck and collar rotate as a unit. A torque indicator (200) is mounted in the stationary block and is responsive to the rotation of the torque transmitting collar to provide an indication of the torque applied to tighten the lock nut.