Tool head, machine tool and boring method of bore of cylinder block using the machine tool
AssigneeHonda Motor Co., Ltd.
InventorsHideki Sadaoka, Hiromi Oshima, Shinji Nogami, Minoru Suzuki, Makoto Ouchi, Masanori Kikuchi
Life of this patent
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Abstract
The spindle drive unit of a combined machine tool drives the spindle. The tip end of the spindle is provided with a boring tool and a tool head having a rough grinding stone and a finishing grinding stone. The spindle drive unit has a first support unit and a second support unit capable of receiving the spindle therethrough and supporting it rotatably, a linear motor and a column slide mechanism for moving the first and second support unit in the axis direction of the spindle, and a spindle motor for rotating the spindle.
Claims15
A machine tool comprising:
- a tool head having a boring cutter and a grinding tool;
- rotating means for rotating said tool head;
- a hollow main shaft connecting said rotating means to said tool head and transmitting rotational power from said rotating means to said tool head;
- a support, wherein said main shaft extends axially through said support and is rotatably supported in said support;
- moving means for moving said support in an axial direction of said main shaft,
- a shaft housed in the main shaft and axially movably splined to the main shaft;
- and
- wherein said tool head comprises expanding means for radially expanding said boring cutter and said grinding tool under predetermined expanding forces and at a predetermined position in response to axial movement of said shaft, said expanding means including a driving source fixedly mounted on said support,
- wherein said main shaft remains unchanged in diameter while being rotated by said rotating means during both a boring process, in which said tool head is rotated and moved towards a workpiece while said boring cutter bores said workpiece, and a grinding process, in which said tool head is rotated and reciprocally moved while said grinding tool grinds said workpiece, and
- wherein machine tool performs boring process and grinding process by radially expanding said boring cutter and said grinding tool.
A machine tool comprising:
- a hollow main shaft rotatable about its axis by a rotating means;
- a support, being rotatably supported in said support;
- a shaft housed in said main shaft and axially movably splined to said main shaft;
- and
- a tool head coupled to a distal end of said main shaft and accommodating a boring cutter and a grinding tool therein, said boring cutter and said grinding tool being radially expandable and contractible;
- said tool head having expanding means for radially expanding said boring cutter and said grinding tool under predetermined expanding forces and at a predetermined position, in response to axial movement of said shaft, for boring and grinding a workpiece;
- said expanding means comprising:
- a servomotor fixedly mounted on said support;
- a pinion gear rotatable or securable in phase by said servomotor;
- a tubular ring gear having outer circumferential gear teeth meshed with said pinion gear, and an internally threaded inner surface, said ring gear being rotatably supported on said support
- a tubular ball screw having outer circumferential gear teeth meshed with said internally threaded inner surface of said ring gear, said ball screw being movable in an axial direction of said shaft in response to rotation thereof;
- and
- a bearing having an inner race fitted over said shaft and an outer race fitted in said ball screw, thereby allowing said shaft to move axially in unison with said ball screw.
Dependencies are inferred from the claim text.