Abstract: A crankshaft machining system includes a center hole boring device, a post-centering balance meter and a cutting device. The post-centering balance meter is configured to measure the shape of a post-centering crankshaft blank on the basis of a pair of center holes. Additionally, the post-centering balance meter is configured to set a principal axis of inertia on the basis of the shape of the post-centering crankshaft blank and generate center hole positional information for correction that indicates intersections between the principal axis of inertia and both end surfaces of the post-centering crankshaft blank. The center hole boring device is configured to bore a pair of center holes on both end surfaces of another crankshaft blank to be loaded next on the basis of the center hole positional information for correction.

Abstract: To provide an automatic chuck greasing device in a crankshaft miller capable of ensuring chuck greasing without missing its timing and preventing failure to remove excess grease by wiping.

Abstract: A crankshaft machining system includes a center hole boring device, a post-centering balance meter and a cutting device. The post-centering balance meter is configured to measure the shape of a post-centering crankshaft blank on the basis of a pair of center holes. Additionally, the post-centering balance meter is configured to set a principal axis of inertia on the basis of the shape of the post-centering crankshaft blank and generate center hole positional information for correction that indicates intersections between the principal axis of inertia and the both end surfaces of the post-centering crankshaft blank. The center hole boring device is configured to bore a pair of center holes on both end surfaces of another crankshaft blank to be loaded next on the basis of the center hole positional information for correction.

Abstract: To provide an automatic chuck greasing device in a crankshaft miller capable of ensuring chuck greasing without missing its timing and preventing failure to remove excess grease by wiping.

Abstract: A method for machining a workpiece in which a machine tool comprising a first and a second chuck devices is employed to machine the workpiece, the machine tool being used in which the first and the second chuck devices comprise a chuck main body, plural chuck jaws, a chuck jaw drive body, and a pressing member, the method comprising: machining a clamp part of the other end part of the workpiece in a state where one end part of the workpiece is clamped by the first chuck device; machining a clamp part of the one end part of the workpiece in a state where the clamp part of the other end part of the workpiece is clamped by the second chuck device; and executing desired machining on the workpiece in a state where each of the clamp parts are clamped by each of the chuck devices.

Abstract: A method for machining a workpiece in which a machine tool comprising a first and a second chuck devices is employed to machine the workpiece, the machine tool being used in which the first and the second chuck devices comprise a chuck main body, plural chuck jaws, a chuck jaw drive body, and a pressing member, the method comprising: machining a clamp part of the other end part of the workpiece in a state where one end part of the workpiece is clamped by the first chuck device; machining a clamp part of the one end part of the workpiece in a state where the clamp part of the other end part of the workpiece is clamped by the second chuck device; and executing desired machining on the workpiece in a state where each of the clamp parts are clamped by each of the chuck devices.

Abstract: A lathe-cutting apparatus and a method with a structure of a chuck being simple, which are capable of lathe-cutting an eccentric part of a crankshaft with high accuracy are provided. For this purpose, the apparatus includes a supporting device (21) for supporting both end portions of a crankshaft (1), a rotational drive device (20) for rotating the crankshaft from at least one end side of the supporting device with a main journal (3) of the crankshaft as a center, and rotationally driving an eccentric part (2), a tool (31) for performing lathe-cutting of the eccentric part, and a cutting tool drive unit (30) for making a cutting edge position of the tool perform crank rotation synchronously with the rotation of the eccentric part which is rotationally driven by the rotational drive device, and performing lathe-cutting of the eccentric part.

Abstract: A lathe-cutting apparatus and a method with a structure of a chuck being simple, which are capable of lathe-cutting an eccentric part of a crankshaft with high accuracy are provided. For this purpose, the apparatus includes a supporting device (21) for supporting both end portions of a crankshaft (1), a rotational drive device (20) for rotating the crankshaft from at least one end side of the supporting device with a main journal (3) of the crankshaft as a center, and rotationally driving an eccentric part (2), a tool (31) for performing lathe-cutting of the eccentric part, and a cutting tool drive unit (30) for making a cutting edge position of the tool perform crank rotation synchronously with the rotation of the eccentric part which is rotationally driven by the rotational drive device, and performing lathe-cutting of the eccentric part.

Abstract: A compound machining center is provided which includes at least one work driving unit, including a chuck, mounted on a bed and adapted to rotate a work to be worked in a state in which the chuck grasps a first end of the work. At least one tail stock center is mounted on the bed and adapted to support a second end of the work so as to support the work on a working axial line between the tail stock center and the chuck of the work driving unit. At least one working unit is disposed on the bed to be movable in an X-axis direction parallel to the working axis line and a Y-axis direction normal to the X-axis direction. And at least one tool is mountable to the working unit to be linearly movable in a tangential direction of the work.

Abstract: A cutter changing system and a method of its operation are disclosed for a crankshaft fabricating miller of internal type in which a cutter body having tips attached thereto along an inner peripheral surface thereof is fitted with and fixed to a cutter adapter so as to be rotatable together with the cutter adapter, thereby permitting a workpiece to be machined therewith by milling to fabricate a crankshaft.

Abstract: A method of machining a crankshaft from a workpiece whereby all of pin and journal portions of the workpiece are milled and thereby machined with a single crankshaft miller unit.

Abstract: A crankshaft machining apparatus for use in machining a crankshaft from a workpiece, includes: a bed; a pair of work heads mounted on the bed for fixedly supporting the workpiece to be machined at both ends thereof, respectively; at least one cutter head disposed between the work heads so as to be displaceable in an axial direction of the workpiece; and an inside edge cutter mounted on a said cutter head for cutting in the workpiece simultaneously a pair of counter weights of the crankshaft along their respective outer peripheries, the counter weights being located at both ends of a pin journal of the crankshaft, respectively. This arrangement has the ability to form the outer peripheries of a pair of counter weights simultaneously, and provides a markedly enhanced machining efficiency.

Abstract: A combined machining apparatus for turning (lathing) and broaching a workpiece is disclosed which includes a work head (4) for carrying a workpiece (12) to be machined while in rotation as clamped thereon, and one or more broaching unit (2) disposed proximal to the work head (4) and moved by a broaching unit feeder (6) longitudinally of the workpiece (12). A broach head (2c), mounted on the broaching unit (2), is moved towards and away from the workpiece (12) by a broach head feeder (7). Mounted on the broach head (2c) in the apparatus (1) is a broaching tool (10) which carries rough machining tips (10e) and finish machining tips (10f) removably on an outer peripheral surface of the broaching tool (10) for turning or lathing and broaching the workpiece (12). A broach drive (8) is operable under an NC to rotate the broaching tool (10).

Abstract: A method of machining with a crankshaft miller to machine a workpiece into a crankshaft with pin and journal portions is disclosed in which a crankshaft workpiece is held in a chuck and is machined for at least a part of pin and journal portions of it with a cutting edge of a cutter body attached to a rotating cutter drum. In this method, such a cutter body is prepared having a diameter of its inner peripheral surface that is slightly larger than the diameter of a pin or journal portion of the workpiece to be machined. The cutter body so prepared is attached to the cutter drum via an adapter having an opening which is larger in diameter than both a diameter of the chuck and a maximum swing of the workpiece. Then, the cutter drum is positioned at a standby site in an area where the chuck is located and the workpiece is secured and held in the chuck.

Abstract: A milling cutter for performing milling work on a work comprises a cutter body having a ring-shaped structure. A plurality of first tips are disposed on an inner peripheral surface of the cutter body along the circumferential direction thereof with a distance between adjacent ones and adapted to perform rough cutting work on a pin, a journal of the work and journal thrusts disposed at both ends of the journal. A plurality of second tips are disposed on both side portions of the inner peripheral surface of the cutter body along a circumferential direction thereof with a distance between adjacent ones and adapted to perform rough cutting work on side surfaces of counterweights disposed at both end sides of the pin and the journal of the work. A flat drag disposed on an inner peripheral portion of the cutter body and adapted to perform a flat cutting work on the journal thrusts.

Abstract: A crankshaft miller performs cutting work by means of a cutter mounted on a rotary cutter drum, for a work which both ends are gripped by chucks, and clamps a portion in the vicinity of a processed portion of the work by a rest arm to be opened and closed. An arrangement for preventing chip from flying around includes a chip flying around preventing cover which is designed for preventing chip from flying around upon stopping of the rotary cuter drum. The chip flying around preventing cover includes a main cover positioned in the vicinity of the rotary cutter drum and having an opening with a diameter sufficiently larger than an external diameter of the chuck when a rotary cutter drum is positioned at a stand-by position; and an auxiliary cover mounted on an opening portion of the main cover and having an opening with a diameter slightly larger than the external diameter of the chuck.

Abstract: A crankshaft miller is constructed by providing two cutter units movably in a longitudinal direction of a work between a pair of work heads provided on a bed and supporting both ends of the work. A cutter for machining a main journal and a first resting device are provided in one of the pair of cutter units. A pitch of the cutter for machining a main journal and the first resting device is selected such that when a counterweight is machined by the cutter for machining a main journal, a main journal which is located adjacent a counterweight forming a pair with the counterweight is clamped by the first resting device. A cutter for machining a pin journal and a second resting device are provided in the other of the pair of cutter. A pitch of the cutter for machining a pin journal and the second resting device is selected such that when a pin journal is machined by means of the cutter for machining a pin journal, the main journal adjacent the pin journal is clamped by the second resting device.

Abstract: A crankshaft miller includes a pair of work heads for supporting both ends of a work, a cutter unit for processing the work and a work rest for supporting the work during processing. The cutter unit and the work rest are provided separately, but are coupled by a separable link mechanism for moving the work rest together with the cutter unit as necessary. A method of use of a crankshaft miller includes the steps of providing a pair of movable work heads for supporting both ends of the work, a cutter unit for processing the work and the work rest for supporting the work during processing. The cutter unit and the work rest are provided separately, but coupled by a separable link mechanism so that the work rest can be moved together with the cutter unit as necessary.