A forged crankshaft assembly for an engine, and a method of manufacturing the same, has a forged crankshaft and a removable counterweight to provide access for core drilling or milling a cavity. The forged crankshaft has a pin bearing journal, a main bearing journal, a first crank arm supporting the pin bearing journal, a second crank arm supporting the pin bearing journal and connecting the pin bearing journal and the main bearing journal, and at least one milled crank arm cavity formed within at least a portion of the second crank arm. The removable counterweight extends radially outward from the first crank arm, wherein the crank arm cavity is configured to be accessible to a core drill or mill cutter only when the removable counterweight is removed from the first crank arm and inaccessible to the core drill or mill cutter when the removable counterweight is coupled to the first crank arm.

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.

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.

A cutter performs milling on a crankshaft blank having a journal and a counterweight coupled to the journal. The cutter includes an annular main body part, a first chip, and a second chip. The annular main body part is centered on a predetermined axis center. The first chip is attached to a circumferential surface of the main body part and is used to cut an external circumferential surface of the journal. The second chip is attached to the circumferential surface of the main body part and is used to cut a groove on the external circumferential surface of the journal.

A cutter performs milling on a crankshaft blank having a journal and a counterweight coupled to the journal. The cutter includes an annular main body part, a first chip, and a second chip. The annular main body part is centered on a predetermined axis center. The first chip is attached to a circumferential surface of the main body part and is used to cut an external circumferential surface of the journal. The second chip is attached to the circumferential surface of the main body part and is used to cut a groove on the external circumferential surface of the journal.

A crankshaft milling cutter has a disc-shaped main body rotatable about an axis perpendicular to the disc plane and on the periphery recesses for receiving indexable cutting inserts for removing an allowance on the crankshaft blank. At least some of the recesses are open both in the radial direction and in at least one axial direction of the main body and a first group of said recesses receives cutting inserts designed for removing the allowance on an oil collar adjoining a shaft journal. To provide a crankshaft milling cutter able to meet the increasing requirements with regard to dimensional and positional tolerances placed on a crankshaft milling cutter and at the same time reduces the time needed for fine adjustment of the crankshaft milling cutter, only some of the first group of recesses has devices for setting the axial position of the indexable cutting insert received in each case therein.

A crankshaft milling cutter has a disc-shaped main body rotatable about an axis perpendicular to the disc plane and on the periphery recesses for receiving indexable cutting inserts for removing an allowance on the crankshaft blank. At least some of the recesses are open both in the radial direction and in at least one axial direction of the main body and a first group of said recesses receives cutting inserts designed for removing the allowance on an oil collar adjoining a shaft journal. To provide a crankshaft milling cutter able to meet the increasing requirements with regard to dimensional and positional tolerances placed on a crankshaft milling cutter and at the same time reduces the time needed for fine adjustment of the crankshaft milling cutter, only some of the first group of recesses has devices for setting the axial position of the indexable cutting insert received in each case therein.

An internal milling cutter for producing a recess terminating in a radius in a workpiece, in particular for milling a crankshaft, comprises a tool holder having interchangeable cutting inserts detachably attached thereto. For the production of the radius, a plurality of first interchangeable cutting inserts are provided, which are arranged one after another in the direction of cut and have cutting edges which produce complementary portions of the radius, wherein the first interchangeable cutting inserts for producing the radius are identically configured.

An internal milling cutter for producing a recess terminating in a radius in a workpiece, in particular for milling a crankshaft, comprises a tool holder having interchangeable cutting inserts detachably attached thereto. For the production of the radius, a plurality of first interchangeable cutting inserts are provided, which are arranged one after another in the direction of cut and have cutting edges which produce complementary portions of the radius, wherein the first interchangeable cutting inserts for producing the radius are identically configured.

The invention relates to a machine comprising a first machining module (1) configured to simultaneously machine at least two crankshafts, a second machining module (2) configured to simultaneously machine at least two crankshafts, and a support structure (3) with at least four crankshaft fixing positions (31, 32, 33, 34) for the machining of such crankshafts. The support structure (3) is located between the machining modules. The fixing positions (31, 32, 33, 34) are arranged in two columns (35, 36) of fixing positions, each of which comprises at least two of the fixing positions (31, 32; 33, 34) located at a different height, and the support structure (3) is rotatably arranged, such that it can perform a rotation of at least 180 degrees.