Screw cutting machine
First Claim
Patent Images
1. A screw cutting machine comprising:
- a table mounting a work thereon;
a rotary cutter spindle exchangeably carrying any selected one of screw cutting tools extending in a perpendicular direction relative to a longitudinal axis of said spindle;
a table feed drive apparatus for feeding said work table with positional control thereof in two mutually perpendicular directions (X, Y);
a spindle drive apparatus capable of rotary driving said spindle at a relatively slow speed and with control of a rotational phase (θ
) thereof;
an axial feed drive apparatus for feeding said spindle in an axial direction (Z) with positional control thereof toward said work; and
a numerical control apparatus for driving said work table in a complete circle about the axis of said spindle while keeping said screw cutting tool in contact with an internal or external surface of the work and while keeping a preselected limit of cutting depth for a complete revolution of said spindle, and for allowing said rotary spindle at the same time to move axially thereof in a length corresponding to a predetermined screw pitch to be machined and in synchronism with said full circle ratational movement of said spindle.
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Accused Products
Abstract
For machining male or female screws, especially of considerably large size diameter, variable pitch or taper, as desired, a machining center is used which is composed of a work table mounting the work fixedly thereon, and a rotatable machining spindle exchangeably fitted with a thread-cutting tool. Axial feed and rotational speed of the spindle are driven by respective drive motors. In addition, the work table is fed bilaterally on a plane perpendicular to the axis of the spindle by respective feed motors. All these four motors are controlled synchronously by respective controllers which are subjected to control by a single parent numerical controller.
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Citations
6 Claims
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1. A screw cutting machine comprising:
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a table mounting a work thereon; a rotary cutter spindle exchangeably carrying any selected one of screw cutting tools extending in a perpendicular direction relative to a longitudinal axis of said spindle; a table feed drive apparatus for feeding said work table with positional control thereof in two mutually perpendicular directions (X, Y); a spindle drive apparatus capable of rotary driving said spindle at a relatively slow speed and with control of a rotational phase (θ
) thereof;an axial feed drive apparatus for feeding said spindle in an axial direction (Z) with positional control thereof toward said work; and a numerical control apparatus for driving said work table in a complete circle about the axis of said spindle while keeping said screw cutting tool in contact with an internal or external surface of the work and while keeping a preselected limit of cutting depth for a complete revolution of said spindle, and for allowing said rotary spindle at the same time to move axially thereof in a length corresponding to a predetermined screw pitch to be machined and in synchronism with said full circle ratational movement of said spindle. - View Dependent Claims (2, 3, 4)
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5. A process for female screw threading a work on a table with use of a rotary spindle carrying a screw cutting tool thereon directed perpendicular thereto, said process comprising the steps of:
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rotating said spindle; rotating said table at a rate that said table performs a complete revolution around a central axis of said spindle for each complete revolution of said spindle while keeping said tool in pressure contact with an inside surface of said work and at a predetermined maximum cutting depth; and axially feeding said spindle by a predetermined length equal to a certain pitch of the screw to be machined and in synchronism with the steps of rotating said spindle and said table.
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6. A process for male screw threading a work on a table with use of a rotary spindle carrying a screw cutting tool thereon directed perpendicular thereto, said process comprising the steps of:
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rotating said spindle; rotating said table at a rate that said table performs a complete revolution around a central axis of said spindle for each complete revolution of said spindle while keeping said tool in pressure contact with an external surface of said work at a predetermined maximum cutting depth; and axially feeding said spindle by a predetermined length equal to a certain pitch of the screw to be machined and in synchronism with the steps of rotating said spindle and said table.
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Specification