Device and method for achieving laser rapid molding of superhigh molecular weight polymer

Abstract

The invention relates to a device and method for achieving laser rapid molding of superhigh molecular weight polymer. The device comprises a laser emission end, a press roll, an infrared thermometer, a signal processing device and a master control system. The laser emission end is used for emitting a laser beam used for irradiating and melting superhigh molecular weight polymer powder. The press roll is used for compacting the superhigh molecular weight polymer in the sintering position of the laser beam. The infrared thermometer is used for monitoring temperature changes of the sintering position. The signal processing device is used for feeding back a technological parameter adjusting signal to the master control system according to a temperature signal. The master control system controls the laser emission end and the press roll according to the technological parameter adjusting signal. The method comprises the steps of powder pre-laying, parameter presetting, sintering compacting, real-time control and molding finishing. According to the device and method, air holes can be effectively prevented from being formed in molded parts; the situation that the superhigh molecular weight polymer is oxidized and decomposed due to excess temperature or heat accumulation is avoided; therefore, high-quality molding of the superhigh molecular weight polymer is achieved, and good molding of the superhigh molecular weight polymer is achieved.

Description

technical field [0001] The invention relates to a laser rapid prototyping device and method, in particular to a laser rapid prototyping device and method for ultra-high molecular weight polymers. Background technique [0002] As a new generation of engineering plastics, ultra-high molecular weight polymers have many excellent properties such as high specific strength, good toughness, wear resistance, corrosion resistance, low temperature resistance, stress crack resistance, impact resistance, adhesion resistance, and self-lubrication. Agricultural production, medicine and national defense construction are playing an increasingly important role. However, this type of material has extremely high molecular weight, and ultra-long, entangled molecular chains, the melt is highly elastic, and the melt index is approximately zero; the molding temperature range is narrow, and it is easy to oxidative degradation; the critical shear rate is low, the friction The coefficient is small, ...

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

The breakage of molecular bonds will lead to a decrease in the performance of molded parts

At the same time, the molecular chain is also closely related to the crystallinity, and the crystallinity will affect the stiffness, tensile strength, hardness, heat resistance, solvent resistance, air tightness and chemical corrosion resistance of the product, and sometimes even directly lead to the molded parts void

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