Gear cutting – milling – or planing – Milling – With regulation of operation by templet – card – or other...
Patent
1995-11-20
1998-06-23
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With regulation of operation by templet, card, or other...
82106, 409199, 409203, B23C 306
Patent
active
057695784
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a crankshaft miller for machining a crankshaft for an engine and so forth, and a method of use thereof.
BACKGROUND ART
Conventionally, a crankshaft miller for machining a crank shaft of an engine generally has two work heads supporting both ends of a work (crankshaft). At the side of one work head, a pin journal cutter and a resting device are provided in a movable fashion along the longitudinal direction of the work. At the side of the other work head, a main journal cutter is provided in a movable fashion along the longitudinal direction of the work. Then, when a crankshaft (work a) for a 4-cylinder engine, as shown in FIG. 1, for example, is machined, both ends of the work a is clamped by means of chucks h and i of both work heads. At first, in a condition where no journal is supported by a resting device c, a second main journal b is machined by the main journal cutter f in a first machining step. Then, at a second machining step, under a condition where the second main journal b is clamped by the resting device c, a third main journal g and a first pin journal d are respectively machined simultaneously by means of the main journal cutter f and the pin journal cutter e. Subsequently, in a similar operations, third to fifth machining steps are carried out.
On the other hand, in recent years, due to an associating increase in speed of the engine, improvement of the rotational balance of the crankshaft has been demanded. For answering such demand, the outer periphery of the counterweight of the crankshaft is machined. However, in the conventional crankshaft miller, since a distance between the pin journal and the resting device cannot be modified during machining, the resting device c cannot be placed at an optimal position on the work d. Therefore, chatter may be caused during machining, making machining impossible.
In such a case, in the prior art, the outer periphery of the counterweight is machined by means of a lathe in a separate machining step.
However, in the method of machining the outer periphery of the counterweight employing the lathe in the separate machining step, extra expense is required for installing the lathe. Also, in the separate machining step, preparation, such as alignment and so forth, becomes necessary, lowering productivity.
SUMMARY OF THE INVENTION
The present invention has the purpose of resolving the such defects. Therefore, it is an object of the present invention to provide a crankshaft miller and a method of use thereof which enables three kinds of machining, of a pin journal, a main journal and a counterweight in addition to milling the crankshaft, thus avoiding the necessity of additional investment for a lathe and improving productivity.
In order to accomplish the above-mentioned objects, in accordance with one aspect of the invention, there is provided a crankshaft miller providing two cutter units provided 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, in which a pitch of the cutter for machining a main journal and the first resting device are selected such that when a counterweight is machined by means of 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 units. A pitch of the cutter for machining a pin journal and the second resting device are 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.
With the construction set forth above, the outer peripheries of the counterweights can be machined by the cutter for the main journal when the main journal of
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patent: 4180359 (1979-12-01), Schmid
patent: 4269551 (1981-05-01), Kralowetz
patent: 4305689 (1981-12-01), Yamade et al.
patent: 4558978 (1985-12-01), Berbalk
patent: 4679973 (1987-07-01), Kodama et al.
Howell Daniel W.
Kabushiki Kaisha Komatsu Seisakusho
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