Weld-mark-free small-caliber pipe extrusion forming method and device

Abstract

The invention discloses a weld-mark-free small-caliber pipe extrusion forming method and device. According to the weld-mark-free small-caliber pipe extrusion forming device, a hollow threaded rod is installed in an inner hole of a material barrel, one end of the hollow threaded rod is in clearance fit with a hollow transmission sleeve of a reduction gearbox and connected with the hollow transmission sleeve of the reduction gearbox through a flat key, and the other end of the hollow threaded rod extends into a supporting cover; a core rod is concentrically arranged in an inner hole of the hollow threaded rod, and a circular-ring-shaped gap is formed between the inner hole of the hollow threaded rod and the core rod; the rod is installed on the supporting cover, the core rod extends out of the supporting cover and is connected with a core rod driving device; a spreader is machined on the portion, inside the supporting cover, of the core rod, and the spreader is two sections of cone bodies coaxial with the core rod. According to the weld-mark-free small-caliber pipe extrusion forming method and device, the overall structure is compact, the energy utilization rate is high, the annular strength of pipes is improved, on the premise of guaranteeing the performance of manufactured products, the wall thickness of the pipe products is reduced beneficially, cost is reduced, and white pollution is reduced at the same time.

Description

technical field [0001] The invention relates to the technical field of advanced molding and processing of polymers and composite materials thereof, in particular to a small-caliber pipe extrusion molding method and device without weld marks, and belongs to the field of polymer material molding processing equipment. Background technique [0002] Compared with metal pipes and cement pipes, plastic pipes have the advantages of high specific strength, good corrosion resistance, good impact resistance and tensile resistance, and at the same time, due to the smooth inner wall of plastic pipes, small friction coefficient, low flow resistance, convenient transportation, It is widely used in various industries due to its advantages such as simple installation. [0003] Pipe extrusion molding has the advantages of high efficiency, continuous production process, and wide adaptability to materials. It is currently the most commonly used molding method for plastic pipes. During the pipe...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of low circumferential strength and poor surface quality caused by the existence of weld marks in the extrusion molding process of commonly used pipe products at present, and provide a small-diameter plastic pipe extrusion molding method without weld marks, which can improve While improving product performance, reduce pipe wall thickness, reduce production costs, prolong pipe life and reduce "white pollution"

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