Producing method forming and model hot enlarge fluorine plastic tube

Abstract

The invention relates to a preparation method and a molding mold of thermal flared end fluoroplastic pipe, which is that a flared end fluoroplastic pip is clamped in a mounting hole of a flared end cavity die with a trumpet flared end and rotates with a chuck of a lathe spindle; a male die expander with a heater and temperature control device is used for heating the head the flared end to flaring temperature and the head the flared end is fed through a lathe tail spindle to ensure that the fluoroplastic pipe is intenerated in rotating and tightly joined and matched with trumpet flared end of the flared end cavity die and cooled to form mold. The heater is fixedly connected on a the male die expander and electrically connected with the temperature control device controlled the temperature of the flared end; the flared end cavity die clamped in a rotator comprises two symmetrical clutch semicylinders is positioned on the same central line with the flared end head of flared end cavity die. The utility model takes advantage of the cold flow property of fluoroplastic to solve the defects that stress centralizes and leaves at the flared end, material is easily decomposed and the flared end is easily cracked. The invention ensures that the wall thickness of expanded trumpet flared end is more uniform and the surface of the flared end is smoother and avoids the occurrences of crinkle, forting and rippling.

Description

technical field [0001] The present invention relates to a manufacturing method and a forming die of a fluorine plastic tube with a thermally flared trumpet shape, more specifically, the present invention relates to a secondary thermally flared forming method for polytetrafluoroethylene plastic tubes and a thermally flared horn Forming die for tetrafluoroethylene plastic pipe with nozzle. The fluoroplastic pipe involved in the description of the present invention is only one type of plastic pipe fittings, but it can be considered that the present invention is suitable for various non-metallic plastic pipe fittings. Background technique [0002] In the known technology, whether the pipe fittings are metal pipes or rubber pipes, the flaring is to force the pipe to deform under the action of external force to form a trumpet shape at the nozzle, and the cold flaring technology at room temperature is used. The stress of cold flaring Concentrated, the material is easy to decompose...

AI Technical Summary

Problems solved by technology

The disadvantage of thermal flaring is that the height space of the drilling machine is small, the length of the tube is easily limited, and the wire of the heater is easily entangled when the spindle of the drilling machine is rotating, causing the heater to fail to work

Secondly, it is difficult to control the flaring temperature, the wall thickness of the flared bell mouth is uneven, the flaring surface is poor in smoothness, and it is easy to wrinkle, foam and produce water ripples.

However, PTFE plastic is different from metal and rubber pipes. Cold flaring will cause fracture at the flaring. On the other hand, due to its insolubility and infusibility, the melting temperature is higher than the decomposition temperature, so it cannot be used like PE, PP, PVC, etc. Thermoplastics achieve thermal expansion near their melting temperature

Images