Forming method of electric cable and insulating part thereof

Abstract

The invention provides a shaping method of insulation part of a cable. A longitudinal hole is arranged in the insulation part. The shaping method comprises steps of providing a pushing die, wherein the pushing die comprises an outer die and an inner die, the outer die and the inner die cooperate with each other to form a material flow chamber, a flow dividing cone is arranged between the outer dieand the inner die and a solid core part is fixed in the flow dividing cone; injecting insulation material flows into the material flow chamber, wherein the insulation material flows pass through theflow dividing cone to be subjected to flow division, and cover the solid core part to shape longitudinal holes. After demoulding, insulation parts with longitudinal holes are acquired. The invention provides a shaping method of the cable. According to the invention, insulation parts with longitudinal holes can be conveniently shaped; the longitudinal holes permits entering of air, and the dielectric constants of the air are smallest, so dielectric constants of the insulation parts are reduced, thereby reducing attenuation of transmission of cable signals.

Description

Technical field [0001] The present invention relates to a molding method of insulating parts, in particular to a method of molding cables and insulating parts thereof. Background technique [0002] All cables have inner conductors and insulating parts. One of the cables is a coaxial cable, which includes inner conductors, insulating parts, outer conductors, and sheaths coaxially arranged from the inside to the outside. Coaxial cable has the advantages of good anti-interference ability and stable data transmission, so it is widely used for transmission, distribution of electric energy or transmission of electrical signals. [0003] The insulating parts of cables are usually made of polytetrafluoroethylene. Polytetrafluoroethylene has excellent performance that other engineering plastics can’t match. It has a wide frequency range, a wide range of high and low temperature applications, good chemical stability, and high electrical insulation strength. It has excellent resistance to at...

AI Technical Summary

Problems solved by technology

Moreover, the structure of the outer mold for the production of solid insulating parts is simple. There are only extrusion areas and sizing areas, which can only make the insulating material cover the outer periphery of the inner conductor, and cannot produce longitudinal holes in the insulating parts.

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