Abstract: A machining device for machining crankshafts has a rotationally driven disk-shaped base body with blade inserts arranged peripherally thereon. A first supply line for a cryogenic cooling medium is arranged concentrically with the axis of rotation and is thermally insulated in at least some sections. The tool has a plurality of second supply lines for the cryogenic cooling medium running across the axis of rotation and leading to the blade inserts, the second supply lines each being thermally insulated in at least some sections. A distributor unit connects the first supply line to at least one of the second supply lines for supplying the cryogenic cooling medium to at least one of the blade inserts. The cryogenic cooling medium can be conducted directly to the blade inserts which are engaged with the crankshaft that is to be machined.

Abstract: Machine and method for machining large crankshafts, which allows simple and reliable synchronization of the rotation of said crankshafts (14) at all points, where said machine has a machining tool (1) configured to move along at least one guide (2) between a first end supporting element (3) and a second end supporting element (4), comprising a first electronic angular position sensor (6) situated on a first rotation shaft (7) of said first end supporting element (3), also comprising a second electronic angular position sensor (8) located on a second rotation shaft (9) of said second end supporting element (4), so that the rotational movement of said first end supporting element (3) is electronically synchronized with the rotational movement of said second end supporting element (4) at all times during the machining of the crankshaft (14).

Abstract: A burr elimination device for a camshaft according to the exemplary embodiment of the present invention may include: an operating cylinder configured to move a rod equipped in an end portion thereof in an up and down direction; an ascent/descent member connected to the rod of the operating cylinder; a rotation unit configured to rotate a camshaft that is held apart from the ascent/descent member and on which cam lobes are formed; a plurality of cylinder members disposed on the ascent/descent member corresponding to the cam lobes; a moving rod configured to be inserted into or drawn out of each of the cylinder members; a spring mounted inside each of the cylinder members and configured to elastically push the moving rod from the interior to the exterior of the cylinder member; and a burr elimination tool that is mounted on the end portion of the moving rod and that is configured to pivot in front/rear and left/right directions with respect to a predetermined center point for continuous elimination of a burr th

Abstract: A crankpin lath is improved in positioning a crankpin onto the axis of work spindles precisely and in a short period of time by the use of simple and low-cost mechanisms. Indexing a crankpin to be machined next onto the axis of the work spindles is initiated in the state that journals of a crankshaft are clamped on index members which are rotatably supported respectively on work spindles with the axes thereof being offset by an eccentricity of crankpins from the axis of the work spindles. First, a clutch device interposed between each of the work spindle and the index member carried thereon is brought into disengagement. Then, a pin pusher is advanced toward the axis of the work spindle as it pushes a machined crankpin of the crankshaft and is positioned to a position spaced by a predetermined distance from the axis of the work spindle while the work spindle is rotated by half an angle through which the crankshaft is to be indexed rotationally.

Abstract: A chuck (25) for chucking a journal (271) of a crankshaft (27) is attached to the distal end of a main spindle (22) rotated by a drive motor. A phasing rotary shaft (53) is connected to the chuck (25) to rotate about an axis offset from the axis of the main spindle (22). The chuck (25) is provided with a coupling (63) that releasably connects the phasing rotary shaft (53) and the chuck (25). Further, a locking mechanism for locking the phasing rotary shaft (53) is provided. The coupling (63) has a pair of coupling plates (64 and 65) that can be moved closer to and farther from each other. Opposing faces of these coupling plates (64 and 65) have teeth (641 and 651), which are meshed when the coupling plates (64 and 65) are brought close to each other.

Abstract: Apparatus for machining first and second throws on a crankshaft wherein the throws are displaced outwardly from the central axis of the shaft in angularly spaced relation to one another. The crankshaft is gripped by a collet. The collet is mounted on a spindle at a point offset radially from the spindle axis. The collet is capable of rotating from a first position in which the first throw is on the axis of spindle rotation to a second position in which the second throw is on the axis of spindle rotation. A tool is provided for cutting the throws when the collet is secured in either one of the two positions. A collet receiver is provided to open and close the collet. A housing for the collet and collet receiver is mounted on the spindle. The collet is locked in each of the two rotative positions by interengaging teeth on the collet receiver and on the housing. When the collet receiver is moved relative to the housing, the teeth become disengaged so that the collet is free to rotate.

Abstract: A system is disclosed for simultaneously and more efficiently setting the stroke position of a crankshaft on a crankshaft lathe and a method of using the system in combination with the lathe for regrinding, building-up by welding or other machining of journals of the crankshaft. The system includes slide blocks and slides in operable combination with rack and pinion gears for simultaneously positioning the crankshaft from a zero loading position to an offset position transverse to the longitudinal axis of the lathe.