4D printing manufacturing method suitable for magnetic composite material

Abstract

The invention belongs to the related technical field of composite material 4D printing, and discloses a 4D printing manufacturing method suitable for the magnetic composite material. The method comprises the following steps: (1) mixing flexible polymer powder, strong magnetic powder and a rheological agent to obtain multiple kinds of composite powder, wherein the mass fractions of the strong magnetic powder in the multiple kinds of composite powder are in graded distribution; (2) forming a formed part of the to-be-manufactured gradient part by adopting a selective laser sintering process basedon the various composite powder and the three-dimensional model of the to-be-manufactured part; (3) magnetizing the formed part to enable the formed part to have permanent magnetism, and placing themagnetized formed part in a magnetic field to enable the formed part to deform, thereby completing 4D printing and manufacturing of the gradient part to be manufactured. According to the method, the performance of the part is improved, the flexibility is high, the mechanical property of the formed part is enhanced, the content of magnetic powder in the height direction of the formed part is distributed in a gradient mode, and the bending angle can be controlled.

Description

technical field [0001] The invention belongs to the technical field related to 4D printing of composite materials, and more specifically relates to a 4D printing manufacturing method suitable for magnetic composite materials. Background technique [0002] The performance requirements of components in the manufacturing field are getting higher and higher, and there is a trend of gradually developing from traditional mechanical properties and kinetic properties to intelligent features. "characteristic. However, the formed parts of traditional 3D printing technology are "stationary" and do not have intelligent features. Smart components often have refined and complex structures, which are especially suitable for forming using 3D printing technology. As time goes by, under external stimuli, the shape, performance, and function of 3D printed smart components can undergo controllable changes. This smart feature introduces the dimension (D) of time into 3D printing technology, th...

AI Technical Summary

Problems solved by technology

This way of thermally actuating the deformation of the member will greatly limit the actuation distance and make it impossible to achieve controllable actuation

At present, those skilled in the art are gradually using magnetic field to drive component deformation to realize 4D printing. For example, patent CN105771003A discloses a method for preparing a biodegradable polymer self-expanding vascular stent based on 3D printing technology, using biodegradable polylactic acid Base Shape Memory Polyurethane / Fe 3 o 4 Nanocomposite materials, the composite material is prepared into a vascular stent by fused deposition manufacturing technology, and the shape memory polymer is remotely excited by the magnetocaloric effect to undergo shape recovery. This invention seems to use magnetic fields and magnetic materials to achieve 4D printing, but it is still thermally driven in essence. , will still be limited by the driving temperature, and cannot achieve remote and controllable driving

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