Screw cutting machine
First Claim
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1. A screw cutting machine comprising:
- a table for mounting a work thereon, said work having a work surface to be machined;
a rotary cutter spindle carrying a screw cutting tool in a direction intersecting a longitudinal axis of said spindle for contacting said work surface;
table feed drive means for rotating said table about said spindle;
spindle drive means for rotatably driving said spindle;
axial feed drive means for feeding said spindle in an axial direction relative to said work; and
means for synchronously controlling said table feed drive means, said spindle drive means and said axial feed drive means, to drive said table in a complete revolution during a complete revolution of said spindle while;
maintaining said screw cutting tool in contact with work surface, keeping a preselected limit of cutting depth, and allowing said rotary spindle means to move axially a distance corresponding to a predetermined screw pitch in synchronism with rotational movement of said spindle.
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Abstract
For machining male or female screws, especially of considerably large size diameter, variable pitch or tapered, 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.
14 Citations
6 Claims
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1. A screw cutting machine comprising:
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a table for mounting a work thereon, said work having a work surface to be machined; a rotary cutter spindle carrying a screw cutting tool in a direction intersecting a longitudinal axis of said spindle for contacting said work surface; table feed drive means for rotating said table about said spindle; spindle drive means for rotatably driving said spindle; axial feed drive means for feeding said spindle in an axial direction relative to said work; and means for synchronously controlling said table feed drive means, said spindle drive means and said axial feed drive means, to drive said table in a complete revolution during a complete revolution of said spindle while;
maintaining said screw cutting tool in contact with work surface, keeping a preselected limit of cutting depth, and allowing said rotary spindle means to move axially a distance corresponding to a predetermined screw pitch in synchronism with rotational movement of said spindle. - View Dependent Claims (2, 3, 4)
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5. A process for cutting a screw thread in a work surface of a work on a table by using a rotary spindle carrying a screw cutting tool thereon in a direction intersecting a rotary axis of said rotary spindle, 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 rotary spindle for each complete revolution of said rotary spindle while maintaining said tool in pressure contact with said work surface of said work and at a predetermined maximum cutting depth; axially feeding said spindle by a predetermined length equal to a desired pitch of the screw to be machined and in synchronization with the steps of rotating said spindle and said table; and controlling said steps of rotating said spindle, rotating said table and axially feeding said spindle to fix said rotary axis of said rotary spindle in a plane of said table. - View Dependent Claims (6)
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Specification