Turning – Lathe – Vertical
Patent
1999-01-21
2000-05-16
Tsai, Henry W. H.
Turning
Lathe
Vertical
82129, 82132, 82137, B23C 524
Patent
active
060621176
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for machining a workpiece to form it with surfaces that are curved or contoured to be non-circular in cross section, e.g., which is capable of simultaneously machining both inside and outside of a hollow workpiece to impart thereto inner and outer peripheral surfaces that are curved or contoured to be non-circular in cross section.
BACKGROUND ART
A certain apparatus for machining a workpiece to yield a product with curved surfaces that are non-circular in cross section, as exemplified by a cam, piston or piston ring having a freely curved or sculptured surface, has so far been known. For example, JP S54-21691 A, JP S63-22201 A and JP H6-75814 B describe such apparatus that yield such products with precision as desired.
The machining apparatus disclosed in JP S54-21691 A is designed to produce a stack of piston rings and is described as characterized by including a workpiece support shaft adapted to carry a workpiece constituted by a piston ring workpiece aggregate comprising a plurality of piston ring workpieces stacked and held together, a tool support means for supporting a cutting tool so as to be radially displaceable in accordance with circularities of machinable surfaces of the piston rings, and at least two electro-mechanical stepping feed means that are with varying amounts of stepping feed and are computer controllable to displace the tool support means radially as desired. In the apparatus so constructed, rotating the workpiece support shaft with the piston ring aggregate carried thereon while driving the stepping feed means under computer control is described to provide machining of the workpieces with their inner and outer peripheral surfaces defined by free curves machined simultaneously with precision as sought.
JP S63-22201 A discloses a lathe with cutting tools for use to machine inner and outer surfaces of a piston ring workpiece, the lathe being designed so that displacing these tools with rotating cams radially of the piston ring workpiece may have the inner and outer peripheral surfaces formed simultaneously of a piston ring product.
The numerically controlled lathe disclosed in JP H675814 B includes a cutter mounting carriage that is movable by a linear motor towards and away from a workpiece such as to yield a piston ring with a skirt portion, the linear motor being adapted to be driven under numerical control by a computer to have an outer peripheral surface of the skirt portion formed by lathing the workpiece. The lathe has a guide section for supporting the carriage that reciprocates, and a plurality of sets of juxtaposed rotary members operable at the opposite sides of the carriage. Also included is a biasing means that supports one of the sets of rotary members to prevent the carriage from laterally moving so that a reaction force that when the workpiece being lathed exerts on the cutting tool may be accepted by both the rotary members and the biasing means. This provision is described to permit the carriage to reciprocate without jolting or shaking, which in turn provides, among others, permitting workpieces to be cut with precision.
The machining apparatus described in JP S54-21691 A, however, in which a piston ring workpiece aggregate is mounted on the workpiece support shaft that extends in a horizontal direction and is rotated therewith to have their outer and inner surfaces simultaneously cut, it has been found that chips caused in cutting its inner surface areas tend to stay inside of the workpiece. This inconveniently requires means for ejecting the chips to be additionally provided and, if they fail to be ejected while cutting is allowed to continue, permits the chips, physically to lower, or otherwise, by raising the temperature of the workpiece with their developing heat, to adversely affect, the cutting accuracy of the workpiece machined.
Also, a plurality of piston ring workpieces in order to be retained integrally in their aggregate form need to be compressed under an elevated pressure typically amoun
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Komatsu Machinery Corp.
Tsai Henry W. H.
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