| 摘要 |
The present invention provides an improved device for and a novel method of forging a helical gear with a sufficiently high accuracy and smoothly removing the helical gear from a die without giving any damage. An ejector of the device has a guide element which allows a screw-type movement, that is, simultaneous movement along and rotation around a vertical axis of the ejector, The ratio of a rotational angle to a moving distance along the vertical axis in a work with a plurality of helical teeth is identical with the same in the ejector, While the ejector moves along the vertical axis by a predetermined distance and simultaneously rotates by a predetermined angle. the work moves along the vertical axis by the same distance and rotates by the same angle. This makes the helical teeth on the work free from an excessive external pressure and allows smooth removal of the work from the cavity of the die.
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