| 摘要 |
FIELD: mechanical engineering. SUBSTANCE: worm cutter has teeth positioned in helical line, with heads of each three teeth positioned in succession have different shear angles: cutting angle at apex of middle tooth is 40-70 deg, of previous tooth - 23-40 deg and of subsequent tooth - 70-82 deg. Distance between tooth apex and beginning portion of cutting section of middle tooth is equal to or less than Cm, of previous tooth is equal to or exceeds Cm, of subsequent tooth is equal to or less than that of previous tooth, where m is worm thread modulus, C is coefficient equal to 0.25 or 0.3 and selected depending on m. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. |
