Extrusion forming die for PTFE (Polytetrafluoroethylene) pipe

Abstract

The invention belongs to the technical field of forming dies, and particularly discloses a PTFE pipe extrusion forming die which comprises a charging barrel, a discharging opening die arranged at the bottom of the charging barrel, a discharging opening formed in the discharging opening die, a charging barrel upper cover plate arranged at the top of the charging barrel, a material cavity formed in the charging barrel, a mandrel arranged in the material cavity, and the mandrel is of a three-section type design and comprises a first mandrel, a second mandrel and an ejector pin. The top end of the push rod is connected with a pressing block through an inner jackscrew, the bottom end, extending into the material cavity, of the push rod is connected with a push block, the push rod comprises a circular ring, and the circular ring is provided with at least two fan-ring-shaped cylinders; by means of the special-shaped cylinder push rod composed of at least two sector-ring-shaped cylinders, the protection effect on the mandrel is achieved on the premise that the maximum anti-pressure capacity is guaranteed, the machining difficulty of the mandrel is reduced on the premise that the coaxiality is guaranteed through the design of the three-section type mandrel and the spherical end of the ejector pin, and the uniformity degree of the wall thickness of a pipe is improved.

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