Right-angle extrusion die for multi-cavity plastic micro-pipe

Abstract

The invention relates to a right-angle extrusion die for a multi-cavity plastic micro-pipe, belonging to the technical field of plastic extrusion molding. The right-angle extrusion die for the multi-cavity plastic micro-pipe is mainly characterized by comprising a flange plate, a connecting pipe, a die head body, a bracket, a mandril body, a mandril, an ingate, a pull rod, an air pipe, a pressing ring, a pressing plate, an auxiliary ring, a locating pin, an adjusting bolt, an ejector rod bolt, a fastening bolt, a pressure / temperature integrated sensor, a heating ring and a thermocouple. A material supply mode in a vertical extrusion direction is adopted for the die; the mandril is fixed by a screw thread pull rod and locked by an ejector rod; the coaxiality and the gap between the mandril and the ingate are adjusted by using a method of fixing the ingate and adjusting the mandril; the pressure / temperature integrated sensor is used for measuring the pressure and the temperature of a plastic fusant in the die; and the heating ring and the thermocouple are used for controlling the temperature of each region in the die. The right-angle extrusion die for the multi-cavity plastic micro-pipe has the advantages that the asymmetric flow balance of the fusant is realized after the plastic fusant flows through a right angle of a special structure of the die and turns, and further uniform thickness of the multi-cavity micro-pipe wall at the ingate outlet of the die is ensured.

Description

technical field [0001] The invention belongs to the technical field of plastic extrusion molding, and relates to a multi-cavity microtube right-angle extrusion die which realizes asymmetric extrusion flow balance of plastic melt through the special structure design of the flow channel of the die. Background technique [0002] As some typical plastic microtubes, such as interventional catheters, plastic optical fibers and automotive oil and gas microtubes, are gradually applied to medical, communication, automotive and other fields, especially high value-added medical multi-cavity interventions with complex cross-sectional shapes and high geometric precision The wide application of microtubes in clinical practice makes the extrusion molding of multi-lumen plastic microtubes one of the research hotspots in the field of plastic molding technology. Among them, how to achieve the flow balance of the plastic melt in the extrusion die has always been a key issue in the research of ...

AI Technical Summary

Problems solved by technology

Because for precision plastic multi-lumen microtubes, the unbalanced melt flow in the runner will lead to uneven wall thickness of the multi-lumen tube, and the cross-sectional shape accuracy of the multi-lumen tube cannot meet the requirements, making it unusable

Therefore, the traditional multi-cavity microtube extrusion die is designed according to the straight channel, which often has the defects of difficult design of ventilation channels and difficult processing of parts, resulting in high design and processing costs and poor reliability.

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