Gear cutting – milling – or planing – Milling – Process
Patent
1998-12-14
2000-12-19
Tsai, Henry W. H.
Gear cutting, milling, or planing
Milling
Process
409197, 409200, 82 111, 82106, 2988808, B23C 306
Patent
active
061619914
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of machining a crankshaft as used in an engine.
BACKGROUND ART
A crankshaft as employed in an engine that can be mounted, e. g., in an automobile has pins and journals typically milled and thereby machined, i. e., shaped, by a crankshaft miller in a workpiece.
A crankshaft shaping miller known in the art is described, e. g., in Japanese Unexamined Patent Publication No. Hei 6-297221.
A crankshaft miller as described in that publication makes use of a cutter which is smaller in width than a pin and a journal of a crankshaft to be machined, in order to permit a workpiece with pin and journal portions that vary in width to be machined by milling those portions each individually in a number of, say, six, divided steps.
The crankshaft miller to mill and thereby machine each of such pin and journal portions in a workpiece also requires the workpiece to be positioned with respect to an angle of rotation thereof, thus a phase position thereof.
Such phase positioning is effected by preliminarily machining a reference seat provided for this purpose in the one of counter weight portions that is located at one end of a workpiece and then, before the workpiece is introduced into the crankshaft miller and is clamped at its opposed ends each with a chuck, by bringing the phase positioning reference seat on the workpiece in contact with a phase positioning jaw located at one of the chucks.
The conventional crankshaft miller, however, makes it impossible to machine the one of journal portions that is located adjacent to the end of the workpiece at which the reference positioning seat is provided, because of interference between the cutter and the phase positioning jaw brought in contact with the reference seat.
This has hitherto required such a journal portion to be machined in a separate step using a separate machine tool such as a lathe. Poor productivity results from the increased number of machining steps necessitated and an added cost of the equipment is incurred because of the use of separate equipment such as a lathe thus rendering the prior art disadvantageous.
It is accordingly an object of the present invention to provide a method of machining a crankshaft from a workpiece whereby all of pin and journal portions of the workpiece are milled or thereby machined with a single crankshaft miller unit.
SUMMARY OF THE INVENTION
In order to achieve the object described above, there is provided in accordance with the present invention as a first embodiment thereof, a method of machining a crankshaft from a workpiece with its opposed ends clamped by a pair of chucks by a rotating cutter to mill and thereby machine journal and pin portions of the crankshaft workpiece successively, which method comprises the steps of: positioning jaw; portions of the said workpiece in succession; in the said workpiece except a first journal portion that is located at a position at which the said phase positioning jaw and the said cutter may interfere with each other, unclamping the one chuck provided with the said phase positioning jaw and retracting the said chuck to a position at which the said Jaw and the said cutter may no longer interfere with each other; chucks; and thereafter milling and thereby machining the said first Journal portion with the said cutter.
The present invention also provides in a second embodiment thereof a method of machining a crankshaft from a workpiece with its opposed ends clamped by a pair of chucks by a rotating cutter to mill and thereby machine journal and pin portions of the crankshaft workpiece successively, which method comprises the steps of: position at which the said phase positioning Jaw and the said cutter may not interfere with each other; thereafter milling and thereby machining a first journal portion in the said workpiece with the said cutter; establishing a phase position of the said workpiece with the said phase positioning Jaw; chucks; and thereafter milling and thereby machining all of the journal and pin portions other than the
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Kumazawa Tadashi
Shimomura Masumi
Komatsu Machinery Corp.
Tsai Henry W. H.
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