3D (three dimensional) printing equipment for preparing thermoplastic elastomer product

Abstract

The invention discloses 3D (three dimensional) printing equipment for preparing a thermoplastic elastomer product, which mainly consists of a material melting and conveying unit, a material squeezing unit, a three-dimensional coordinate platform and a rack; in the material squeezing unit, a valve body is full of melted and plasticized materials through a hot runner; the opening and closing of the nozzle of the valve body is controlled by a valve needle; the valve needle is fixed onto a thermal insulator which has certain elastic deformation capability and thermal insulation capability; corresponding force is applied to the upper side of the thermal insulator by using a spring and an electromagnet, so as to enable pressure generated by the melted materials in the valve body to be balanced with the applied force, so that the valve needle can seal the nozzle, and when the electromagnet is controlled to intermittently move up and down according to certain rules by a controller, the valve needle also moves up and down correspondingly due to the fact that the balance of the force is broken, so that the nozzle is continuously opened and closed to form micro droplets; micro droplets are cooled and formed on the three-dimensional platform, and the product is finally printed. According to the equipment disclosed by the invention, different materials of micro droplets or fuses can be sprayed according to different time sequences, and the product, which is made from a soft and hard composite material and has multifunctional gradients, can be printed.

Description

technical field [0001] The invention relates to the technical field of three-dimensional printing, in particular to a three-dimensional molding device and method for preparing thermoplastic elastomer products by applying the principle of extrusion molding. Background technique [0002] At present, 3D printing technologies include stereolithography, material jetting, binder jetting, fused deposition manufacturing, selective laser sintering, sheet lamination, and directed energy deposition, among which fused deposition modeling is the most widely used. Fused deposition molding uses a hot melt nozzle to melt the plastic fiber material and extrude it from the nozzle, deposit it at a designated position and then solidify it. The material of the fused deposition modeling process is generally a thermoplastic material, such as wax, ABS, PC, nylon, etc. Before printing, it is necessary to process the corresponding material into a filament material with a specific diameter, and perfo...

AI Technical Summary

Problems solved by technology

Before printing, it is necessary to process the corresponding material into a filament material with a specific diameter, and perform corresponding treatments such as dust removal and drying. The phenomenon of material slipping and entanglement occurs, resulting in insufficient melting and feeding, and defects in products

In addition, the existing fused deposition modeling 3D printers mainly use double-roller extrusion to drive the filament forward, and the unmelted part acts as a plunger to push the molten part out of the nozzle. However, due to the lack of necessary materials such as TPE, TPU, and PA12 Therefore, 3D printing equipment using fused deposition modeling technology on the market can only process PLA, ABS, PC and other materials, and cannot print materials such as thermoplastic elastomers, which limits the application of 3D printing.

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