Patent ID: 6151941
Filing Date: 2000-11-28
Classification: B21H,B22F,B23P,Y10T

Abstract:
A method of roll form densifying sintered powder metal gear preforms comprising:supporting a sintered powder metal gear preform having gear teeth for rotation about a fist axis;supporting a forming roll having a helical worm thread for rotation about a second axis transverse and angularly affixed relative to the first axis;disposing the worm thread of the forming tool in meshing engagement with the gear teeth of the preform;positively driving the forming roll about the second axis to impart synchronous rotation to the preform about the first axis; andwhile driving the forming roll, positively driving the preform about the first axis in controlled out of sync relation to the rotation imparted thereto by the forming roll to introduce a rotational binding force between the worm thread and preform teeth sufficient to displace and densify the teeth of the powder metal preform, substantially without removing material from the preform or forming roll.