Composite structure of round-trip shape memory self-assembly gear and achieving method thereof

Abstract

The invention discloses a method for achieving a round-trip shape memory self-assembly gear in the field of micro mechanical manufacturing, which achieves two-way reversible self-assembly shape change of a smooth structure and a gear structure. A composite structure is formed by an inner layer shape memory polymer cylinder core of low transition temperature and an outer layer shape memory polymer thin film of high transition temperature. By means of different transition temperatures of the shape memory polymer cylinder core and the outer layer thin film (namely, shape memory transition points are different), two-way reversible shape change of the composite structure of the smooth structure- the gear structure- the smooth structure in the heating process is achieved. Gear parameters are adjusted by changing parameter ratio of the cylinder core and the outer layer thin film, and the cylinder core structure is utilized to achieve profiled gear self-assembly. The method is capable of achieving automatic generation of small complex gears and free of machining, has important application prospects in the micro mechanical field, and further achieves the two-way shape memory function which traditional single shape memory polymer doesn't have.

Description

Technical field [0001] The invention belongs to the technical field of micromechanical manufacturing, and relates to a polymer composite structure capable of realizing a two-way shape memory function and a self-assembled gear realization method. Background technique [0002] Shape memory polymers are another new type of shape memory functional materials discovered by humans after shape memory alloys and ceramics. It is generally a two-phase structure, which consists of a stationary phase that memorizes the initial shape and a reversible phase that changes with temperature. In use, generally, the material with a certain initial configuration is firstly restricted above the softening temperature of the reversible phase to achieve the expected deformation, and then the temperature is lowered to below the critical softening temperature of the reversible phase, and the reversible phase freezes. At this time, the material can still be removed even if external force This "temporary" de...

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Problems solved by technology

However, shape memory polymers usually only have a one-way shape memory function, that is, they can only achieve a one-way change from a fixed state to an initial state, and cannot achieve reversible transformation.

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