Automatic reducing plastic extrusion die

Abstract

The invention discloses an automatic reducing plastic extrusion mold, and relates to the technical field of plastic extrusion, the automatic reducing plastic extrusion mold comprises a mold body and a reducing mechanism, the mold body comprises a mouth mold and a core mold, the core mold is arranged in the mouth mold in a penetrating manner, an extrusion channel is formed between the mouth mold and the core mold, and the extrusion channel is provided with an extrusion section; the variable-diameter mechanism comprises a variable-diameter outer die, a variable-diameter inner die and a variable-diameter driving part, the variable-diameter outer die is movably arranged at the end, close to the extrusion section, of the mouth die, the variable-diameter inner die is arranged at the end, close to the extrusion section, of the core die, the variable-diameter inner die penetrates through the variable-diameter outer die, and the output end of the variable-diameter driving part is connected with the variable-diameter outer die. According to the plastic extrusion die capable of automatically reducing, the reducing outer die is driven by the reducing driving piece to move in the direction of the central axis of the mouth die, so that the distance between the port of the reducing outer die and the outer wall of the reducing inner die is changed, and the wall thickness adjustment of an extrusion pipeline is realized; meanwhile, by adjusting the reducing outer die in the axial direction, the phenomenon that the wall thickness is not uniform in the radial direction can be avoided, and the quality of the extruded pipeline is ensured.

Description

technical field [0001] The invention relates to the technical field of plastic extrusion, in particular to an automatic diameter-variable plastic extrusion die. Background technique [0002] During the production of plastic extruded tubes, due to factors such as mold clearance and plastic raw material processing performance, the wall thickness of the product does not meet the requirements and cannot be adjusted by technological means. For example, different dies and mandrels are required when producing pipes with different specifications or the same specifications and different wall thicknesses. Differences in material properties often also affect product thickness. In this way, the number of molds is extremely large, and the management is complicated and expensive. And changing different specifications must change die and mandrel, and labor intensity is big and expense is high. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the inventio...

AI Technical Summary

Problems solved by technology

In this way, the number of molds is extremely large, and the management is complicated and expensive.

Moreover, the die and core mold must be replaced to replace different specifications, which is labor-intensive and expensive

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