Internal gear grinding machine

摘要

An internal gear grinding machine achieves space savings and reduction in size of a machine, as well as prevents the tools from being damaged even when an abnormal situation such as a blackout occurs, by a simplifying dressing operation. The internal gear grinding machine for grinding a workpiece (W) by synchronously rotating the workpiece (W) and a barrel-shaped threaded grinding wheel (17) in mesh with each other includes a dressing device (20) for dressing the threaded tool (17) by meshing the threaded grinding wheel (17) with a disk dresser (56). When dressing, the threaded grinding wheel (17) and the disc dresser (56) are operated in accordance with the helix angle and barrel shape of the threaded grinding wheel (17), and the brake mechanism (58) applies a braking force to a dresser turn drive motor (53) to enable the disc dresser (56) to be maintained at a turned position thereof.

主权项

1. An internal gear grinding machine for use in grinding a to-be-machined internal gear by synchronously rotating the to-be-machined internal gear and a barrel-shaped threaded tool in mesh with each other, the to-be-machined internal gear being rotatable about a work rotation axis, the barrel-shaped threaded tool being rotatable about a tool rotation axis having a predetermined crossed axes angle with respect to the work rotation axis, the internal gear grinding machine comprising:
dressing means for dressing the threaded tool with a disk-shaped dresser rotatable about a dresser rotation axis in accordance with a shape of the threaded tool, the dressing means including:
dresser turning means for turning the dresser about a dresser pivot perpendicular to the dresser rotation axis; andbraking and maintaining means for applying a braking force to the dresser turning means, and maintaining the dresser at a turned position thereof, the braking and maintaining means including:
a rotary shaft disposed coaxially with the dresser pivot and rotatably supported in a casing;a disk-shaped rotary disk provided on the rotary shaft;a fixing member provided in the casing and opposing the rotary disk;an armature disposed between the rotary disk and the fixing member and supported to be slidable along the rotary shaft;a brake disk disposed at a side opposite to the armature with respect to the rotary disk;a spring member provided in the fixing member to bias the armature toward the rotary disk; anda coil member provided in the fixing member to generate a magnetic force when being supplied with power and thereby attract the armature against a biasing force of the spring member.