FIELD: plastic working of metal, namely formation of inner thread on coupling end of tube blank.
SUBSTANCE: method comprises steps of producing tube blank with inner diameter of its end portion equal to outer diameter of threading punch and with outer diameter determined according to mathematical expression received experimentally; placing end portion of tube blank on stationary tool having threaded working surface whose profile corresponds to that of formed thread; performing plastic deforming of said end portion while filling with blank metal thread grooves of tool till forming target profile of thread due to squeezing it during one pass by means of cone die having sizing collar whose diameter is equal to outer diameter of ready part; using threaded punch as stationary tool with threaded working surface.
EFFECT: improved quality of inner thread on end portion of tube blank, simplified process of thread forming.
5 cl, 2 dwg
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