A well mold core for double -wall pipe expansion mould

The utility model discloses a well mold core for double -wall pipe expansion mould, mold core body, an and portion of inserting of body coupling tip before well mold core body including one in, wherein, the perforation of offering in running through in proper order mold core body and the portion of inserting in should on the mold core body central axis direction and supplying the double -wall pipeto pass, the mold core body epirelief is equipped with the heliciform bead in this, then on mold core body formation heliciform chute in this. The utility model provides a well mold core for double -wall pipe expansion mould, structural design is special, novel, reasonable, can be used to double -wall pipe expansion mould, realizes expanding the size of a dimension that becomes to need with the double -wall pipe to cool off heat treatment, improve double -wall pipe wholeness ability, make the double -wall pipe play fixed, sealed, waterproof, damp -proofing effect to inserting its inside wirerod. 本实用新型公开了种用于双壁管扩张模具的中模