| 摘要 |
The present invention relates to a tool machine of a known type in which a crankshaft is machined by a rotary annular tool having internal cutting edges located on at least one circle through which the crankshaft extends. The crankshaft is held by means mounted on the bed of the machine in stationary condition. A slide on this bed movable in a direction parallel to the crankshaft carries a tool unit which is movable on the slide to a cutting position in which said circle is located in a tangential relationship to the pin of the crankshaft being cut and to a loading and unloading position in which said circle is brought to co-axial relationship with the main axis of the crankshaft. When the tool unit is in this position, it may be moved by the slide to such a position close to one of the columns on the bed that the tool surrounds a substantially cylindrical projection on the column carrying the end of the crankshaft. In this position the tool unit is located beyond the end of the crankshaft permitting the same to be easily released from the clamping and centering means and unloaded from the machine which may then be charged with the next crankshaft. A second slide on the bed carries a second tool unit with the same equipment which in the loading and unloading position is located beyond the other end of the crankshaft. Each rotary annular tool may have internal cutting edges located on a plurality of co-axial spaced circles through which the crankshaft extends. Therefore, the tool of each tool unit is capable of simultaneously machining two or more co-axial sections of the crankshaft, such as the line bearing sections. Each tool comprises axially spaced annular cutting elements having internal cutting edges and mounted within an annular supporting body provided with apertures for the discharge of chips. Preferably the tool in one tool unit rotates in a direction opposite to the tool of the other tool unit and these tools engage the crankshaft in different radial planes of the crankshaft which may be offset from each other by a large angle up to 180 DEG . The tool is rotatably mounted within an eccentric body which in its turn is mounted within the tool unit for rotation whereby the cutting tool may be caused to orbit around the work. The eccentric body may be composed of relatively adjustable elements affording a variation of the distance of the tool axis from the axis of the eccentric body. This variation affords a possibility of roughing and finishing the work.
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