Rapid forming device for ultra-high-molecular-weight polymer

Abstract

The invention discloses a rapid forming device for an ultra-high-molecular-weight polymer. The device comprises a stock bin, a spray head arranged at the bottom of the stock bin, and a heating module.The heating module forms a heating area, and the temperature of the heating area is gradually increased from the top of the stock bin to one side of the spray head at the bottom. A feeding chamber which corresponds to the heating area is formed in the stock bin, and the feeding cross section of the feeding chamber is changed from the stock bin to one side of the spray head. The feeding chamber comprises a first feeding cavity, a second feeding cavity and a third feeding cavity, and the cross section areas of feeding, along the stock bin, of the first feeding cavity, the second feeding cavityand the third feeding cavity are gradually reduced. The rapid forming device for the ultra-high-molecular weight polymer has the advantages of being adapted to a large range of temperature interval, and having high adaptability to the environment and a flexible and changeable printed forming structure. Preheating, shrinkage heating, and small hole shrinkage for accelerated extrusion of the solid or powdery ultra-high-molecular-weight polymer in the stock bin are realized.

Description

technical field [0001] The invention belongs to the technical field of polymer material molding, and in particular relates to a rapid prototyping device for ultra-high molecular weight polymers. Background technique [0002] 3D printing is a popular concept and a kind of rapid prototyping technology, which was born in the late 1980s. This technology integrates mechanical engineering, material engineering, numerical control technology, laser technology and other technologies, and uses the material accumulation method to manufacture the prototype of parts. The principle is to first model with computer-aided design (CAD) or computer animation modeling software to form a digital model, then decompose the three-dimensional model into two-dimensional cross-sections layer by layer, and accumulate and solidify the printing materials layer by layer through the software and numerical control system. Create physical products. The mainstream methods include Stereo Lithography Apparatu...

AI Technical Summary

Problems solved by technology

In addition, the fluidity of the polymer in the molten state is extremely poor, the relative position between the particles changes little, there are a lot of pores inside the molded part, and the density is low, which seriously affects the molding quality

[0006] Second, the processing temperature range of ultra-high molecular weight polymers is narrow, and it is more sensitive to laser energy density and sintering position temperature

[0009] Although the above-mentioned prior art has proposed a rapid prototyping method for ultra-high molecular weight polymers, there are still many problems in practical applications. For rapid prototyping, the laser of this method can only provide a temperature difference of 20-30 degrees, and cannot print materials with a large temperature difference. At the same time, the way of powder laying wastes too much material, and in most cases, new and old powders are mixed, which is harmful to molding The quality of the workpiece is affected. In addition, the method of laser sintering powder bed has strict requirements on the ambient temperature, and it needs to be printed in a greenhouse or a closed space, and the method of powder laying cannot print closed structures, and the application occasions are limited.

[0010] Therefore, it is necessary to improve the deficiencies and defects of the prior art, and provide a rapid prototyping device for ultra-high molecular weight polymers, which adopts a high-temperature melting method to heat ultra-high molecular weight polymers to a molten state and extrude them. Adapt to the characteristics of large temperature range, strong adaptability to the environment, material saving, and flexible and changeable printing structure. By setting the silo as three feeding chambers, the solid or powdery ultra-high molecular weight polymerization in the silo is realized. Preheating of the product, shrinkage heating and small hole shrinkage to accelerate extrusion, etc.; in addition, by setting a gradient heating area, the problem of expansion and deformation of the ultra-high molecular weight polymer in the molten state and the inability to extrude is avoided.

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