FIELD: plastic working of metals, namely outer thread forming on end portion of tube blank, mainly on nipple end of adapter for pump-compressor tubes.
SUBSTANCE: method comprises steps of producing tube blank with outer diameter of end portion equal to inner diameter of threading die and with inner diameter determined according to mathematical expression received by experimental way; placing end portion of tube blank in die with internal thread whose profile corresponds to that of thread to formed on blank; performing expansion from inside of said end portion while filling with blank metal thread grooves of die during one pass by means of cone punch having sizing collar whose diameter is equal to inner diameter of ready part.
EFFECT: improved quality of outer thread on end portion of tube blank, simplified process of thread forming.
5 cl, 2 dwg
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