FIELD: machine building.
SUBSTANCE: proposed device comprises tap and tap drive. Tap thread ID at taper lead is smaller than ID required for thread cutting by double surface defective layer formed at cut thread turn top. Said tap has sections equipped with cutters for chipping. Cutters are arranged at the last turn of taper lead and the first turn of gaging part. Cutting edges of said cutters are located in the area of plastically deforming metal wave formation to allow a complete cutting of waves. Tap has lengthwise central bore and crosswise bores to force lubricant-coolant into cutting zone. Tap drive is equipped with overrunning coupling composed by case, hub and rollers. Case splines inclined to lengthwise axis interact with coupling inclined splines to increase spindle rpm.
EFFECT: higher cutting quality and efficiency, longer life.
10 dwg, 1 tbl, 1 ex
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RU2443491C1 |
