| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device of large lead and high speed/high deceleration operation specifications with long life and low noise by preventing early exfoliation of the ball in use under heavy load environment. SOLUTION: As balls 5 built into a ball screw device 100 of a ball circulation type by a ball tube 50A, balls having a residual compression stress distribution wherein the maximumσ<SB>s</SB>is 1000 MPa or less, and a residual compression stress valueσD at a depth of Dw×1% under the surface to the ball diameter Dw is same as the maximumσ<SB>s</SB>or less after surface hardening and polish finishing following quenching and tempering in a manufacturing process are used. Furthermore, resin spacers 10 are interposed between respective balls 5 of a large number of balls 5 interposed between the screw grooves 2, 4. COPYRIGHT: (C)2003,JPO |
