Device and method for manufacturing crown gear

摘要

The inventive device includes a work supporting portion for supporting a work rotatably about a first axis, a cutter supporting portion for supporting a cutter rotatably about a second axis different from the first axis and a moving portion for moving the cutter along a reference line extending through the first axis. The second axis is slanted relative to a reference plane oriented perpendicular to the first axis and a blade edge of the cutter is caused to come into contact with the work at an offset position offset from the reference line. The work and the cutter are driven in synchronism and the cutter is moved along the reference line.

主权项

1. A device for manufacturing a crown gear comprising:
a work supporting portion for supporting a work rotatably about a first axis; a cutter supporting portion for supporting a cutter rotatably about a second axis different from the first axis; a synchronized driving portion for rotating the work supporting portion and the cutter supporting portion in synchronism with each other; and a moving portion for moving the cutter supporting portion relative to the work supporting portion; wherein the second axis is disposed under a set posture along a reference line passing through the first axis and set at an offset region offset from the reference line as viewed along a direction parallel with the first axis and the second axis is disposed under a posture slanted relative to a reference plane extending perpendicular to the first axis, whereby the work supporting portion and the cutter supporting portion are configured to cause a leading end of the cutter to contact with the work at the offset region at an angle relative to a rotational plane of the work; the synchronized driving portion rotates the work supporting portion and the cutter supporting portion in synchronism in such a manner to move an outer circumference of a blade edge at the leading end of the cutter in a direction same as a rotational direction of the work; the moving portion moves the cutter in a direction along the reference line; the blade edge of the cutter projects outwards from the second axis; a blade body portion is formed in a spiral shape to extend continuously from the blade edge along the second axis; the cutter supporting portion includes a holder for supporting a proximal end portion of the cutter, and an intermediate supporting portion for supporting the blade edge at an intermediate position of the cutter relative to a longitudinal direction thereof to maintain the cutter in the posture slanted relative to the reference plane; and the intermediate supporting portion supports the blade body via a support ring.