Camshaft bore machining method and apparatus

Details Camshaft bore machining method and apparatus Camshaft bore machining method and apparatus

1992-01-21

1993-06-22

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

82 111, 408 57, 408 83, 408145, B23B 4112

Patent

active

052211657

ABSTRACT:
A method, machine tool and boring bar for machining bores in a series of concentric journals for a camshaft in a cylinder head or block of an engine. The boring bar has an elongate and cylindrical body with a single cutting insert at one end for machining all of the journals one at a time and a plurality of circumferentially spaced and longitudinally extending bearing pads on the body which, when the insert is machining one journal, are received in the previously machined journals to radially constrain and support the boring bar. The other end of the bar is received in a chuck or drive spindle of the machine tool which rotates and advances the boring bar through the journals to machine them. Each workpiece is located and clamped in the machine tool with its series of journals to be machined substantially concentric with the axis of rotation of the insert of the boring bar. The machine tool alternately rapidly advances and then slowly in-feeds the boring bar through each of the journals at the desired feed rate to machine it. After all the journals are machined, the boring bar is rapidly retracted and withdrawn from the workpiece.

REFERENCES:
patent: 4279550 (1981-07-01), Kress et al.
patent: 4693642 (1987-09-01), Mair et al.
patent: 5066173 (1991-11-01), Gaffan et al.

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