Threading device and threading method
AssigneesCitizen Watch Co., Ltd., Citizen Machinery Co., Ltd.
InventorsHikaru Takahashi, Tamotsu Katsuta
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Abstract
Disclosed are threading device and threading method, including a turning step for threading a rotating workpiece with a predetermined cutting depth, by relatively moving a tool in the axial direction of the workpiece and then rounding-up the workpiece obliquely by relatively moving the tool in the axial direction and radially outward. The workpiece is subjected to the threading process by repeatedly carrying out the turning step while sequentially shifting the axial position for starting the rounding-up of the workpiece relative to an axial position where the rounding-up of the workpiece has been started in a previous turning step.
Claims6
A threading device for forming a thread groove in a workpiece, comprising a spindle for rotatably supporting the workpiece, and a controller for controlling a relative movement of a tool with respect to the workpiece, wherein the controller controls the movement of the workpiece and the tool in accordance with a predetermined turning step:
- wherein the turning step is carried out by relatively moving the tool in an axial direction of the workpiece to subject the rotating workpiece to cutting with a predetermined cutting depth, and then relatively moving the tool in the axial direction and radially outward to subject the workpiece to rounding-up obliquely;
- and
- wherein the controller controls the turning step to be carried out repeatedly at the predetermined cutting depth, while sequentially shifting an axial position for starting the rounding-up of the workpiece relative to an axial position where the rounding-up has been started in a previous turning step, thereby forming a thread groove in the workpiece.
Dependencies are inferred from the claim text.