| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breaking trouble of a shaft part and the damage by operation stop by calculating the stress added to the shaft part in the corner part between the shaft part and a panel board part, taking the stress concentration in the corner part into consideration. SOLUTION: When the stress of the corner part between a shaft part and a panel board part in a two-shaft type hollow roll, stress concentration is taken into consideration. Namely, it can be calculated from stress δ = coefficient of stress concentration α× load stress δ0 . When a concentrated stress W is added to the position of a length (a) from both end surfaces. 1A in a double end supported hollow roll with a diameter (d) and a length 2L, the load stress δ0 in the part (a) can be determined by the expression I. M represents the bending moment in the point (a). When the hollow roll is a stepped round shaft 2 (R: the radius of a major diameter part 2A, t: the width of the major diameter part 2A, d: the diameter of a minor diameter part 2B, r: the curvature radius of the corner part between the major and minor diameter parts 2A, 2B), the coefficient of stress concentration α when the bending moment M is added can be determined by the expression II. In the expression, Const is constant, (f), (g), and (h) represent functions of parameters r/d, R/d, t/D. |
