Cutting-off method of an automatic lathe and an automatic lathe
First Claim
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1. A cutting-off method of an automatic lathe comprising:
- applying a front working to a bar material by a front working tool by moving a headstock in an axial direction from a working start position toward said front working tool with said bar material chucked by a main spindle rotatably supported by said headstock and a top end of said bar material supported by a guide bush;
after completion of said front working, cutting off said bar material by a cut-off tool with said top end of said bar material chucked and rotatably driven by a sub spindle rotatably supported by a rear headstock; and
simultaneously with said cutting-off, releasing the chucking of said bar material by said main spindle so that said headstock may rearwardly move to the working start position to be ready for another front working.
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Abstract
A cutting-off method of an automatic lathe, comprising steps of applying a front working to a bar material by a front working tool with the bar material chucked by a main spindle rotatably supported by a headstock and with a top end of the bar material supported by a guide bush, applying a cutting-off by a cut-off tool after completion of the front working with the top end of the bar material chucked and rotatively driven by a sub spindle rotatably supported by a rear headstock, and simultaneously releasing the bar material chucked by the main spindle so that the headstock may rearwardly move to a working start position to be ready for the next working.
19 Citations
12 Claims
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1. A cutting-off method of an automatic lathe comprising:
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applying a front working to a bar material by a front working tool by moving a headstock in an axial direction from a working start position toward said front working tool with said bar material chucked by a main spindle rotatably supported by said headstock and a top end of said bar material supported by a guide bush; after completion of said front working, cutting off said bar material by a cut-off tool with said top end of said bar material chucked and rotatably driven by a sub spindle rotatably supported by a rear headstock; and simultaneously with said cutting-off, releasing the chucking of said bar material by said main spindle so that said headstock may rearwardly move to the working start position to be ready for another front working. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An automatic lathe comprising:
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a headstock which rotatably supports a main spindle and is movable in an axial direction of said main spindle; a rear headstock, provided opposite to said headstock, which rotatably supports a sub spindle and is movable in an axial direction of said sub spindle wherein said sub spindle rotates synchronized with said main spindle; a guide bush provided between said main spindle and said sub spindle; at least one tool post provided at the side of said guide bush and movable relative to said headstock, said at least one tool post having both a cut-off tool and a front working tool; and a control means for; applying a front working to a bar material chucked by said main spindle by moving said headstock in an axial direction from a working start position toward said front working tool, and cutting off said bar material by said cut-off tool after completion of said front working, said cutting-off comprising; chucking said bar material by said sub spindle and releasing said chucking by said main spindle so that said headstock may be retracted to the working start position, determining whether or not said main spindle of the retracted headstock chucks again said bar material when said cutting-off reaches a predetermined intermediate position, and continuing said cutting-off if it is determined that said bar material is chucked by said main spindle. - View Dependent Claims (8, 9)
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10. An automatic lathe comprising:
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a headstock which rotatably supports a main spindle and is movable in an axial direction of said main spindle; a rear headstock provided opposite to said headstock, which rotatably supports a sub spindle and is movable in an axial direction of said sub spindle, wherein said sub spindle rotates synchronized with said main spindle; a guide bush provided between said main spindle and said sub spindle; a plurality of tool posts provided at the sides of said guide bush and movable relative to said headstock, one of said tool posts having a cut-off tool and another of said tool posts having a front working tool; and a control means for; applying a front working to a bar material chucked by said main spindle by moving said headstock in an axial direction from said working start position toward said front working tool, and cutting off said bar material by said cut-off tool after completion of said front working, said cutting-off comprising; chucking said bar material by said sub spindle and releasing said chucking by said main spindle so that said headstock may be retracted to said working start position, determining whether or not said main spindle of said retracted headstock chucks again said bar material when said cutting-off reaches a predetermined intermediate position, and continuing said cutting-off if it is determined that said bar material is chucked by said main spindle. - View Dependent Claims (11, 12)
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Specification