CN102555388B - Composite structure of round-trip shape memory self-assembly gear and achieving method thereof - Google Patents
Composite structure of round-trip shape memory self-assembly gear and achieving method thereof Download PDFInfo
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- CN102555388B CN102555388B CN201210010314.0A CN201210010314A CN102555388B CN 102555388 B CN102555388 B CN 102555388B CN 201210010314 A CN201210010314 A CN 201210010314A CN 102555388 B CN102555388 B CN 102555388B
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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
The invention belongs to micro-machining field, relate to a kind of polymer complex structure and the self assembly gear implementation method that realize two-way shape memory function.
Background technology
Shape-memory polymer is the novel shape memory functional material of another class that the mankind find after marmem and pottery.It is generally two phase structure, namely by the Stationary liquid remembering original shape and the reversible phase composition changed with temperature.Use and generally first can impose restriction to the material with certain initial configuration above anti-phase softening temperature, it is made to reach expection deformation, then below reversible mutually critical softening temperature is cooled to, now external force removal material can freeze by anti-phase, even if still can keep this " temporarily " deformation state substantially; When being again warming up to more than material softening temperature, inside freezes to remove, state before material is returned to initial deformation again under internal stress effect.So far, the thermodynamic cyclic process of " memory initial state → fixed deformation state → reply initial state " is completed.
Such functional material has low cost of manufacture, easily production, transfer of shapes temperature is adjustable, part has the plurality of advantages such as biological degradability, has important application prospect in fields such as biologic medical, Space Science and Technology and microelectronics.But shape-memory polymer only has one-way shape memory function usually, namely only to realize the unidirectional change from shape stationary state to initial state, reversible transition cannot be realized.The application's patent " two-way shape memory self assembly gear " can realize the bidirectional reversible change of cylinder and gear-like structure, and by controlling its thermodynamic process and structural behaviour, the self assembly of the consecutive variations and polymorphic structure gear that can realize gear parameter generates, without the need to machining, this has important application prospect in following micro code-lock field.
Summary of the invention
The present invention proposes a kind of self assembly generation method of two-way shape memory gear, without the need to machining.This composite construction, by particular thermal mechanical process, can realize the two-way self assembly transfer of shapes of cylinder and gear structure.This self assembly gear has the feature such as two-way shape memory function, gear parameter continuously adjustabe.
A kind of composite construction realizing two-way shape memory self assembly gear, this composite construction is made up of the shape-memory polymer core body of internal layer and outer field shape-memory polymer film, and the shape memory transition temperature of shape-memory polymer core body and shape-memory polymer film is respectively T
g1and T
g2, and T
g1< T
g2.This composite construction original shape is smooth cylinder or round platform.
Described composite construction realizes the method for two-way shape memory self assembly gear, and it is as follows that the method comprising the steps of:
1) at environment temperature T > T
g2under condition, initial axial crushing deformation is applied to this composite construction;
2) keep this distortion, be cooled to T < T
g1, realize the shape freezing of initial deformation, then remove externally applied forces;
3) T is heated to
g1< T < T
g2, shape-memory polymer core body recovers distortion, outer shape-memory polymer film compressive buckling, formative gear shape structure;
4) T > T is heated to
g2, also there is shape and recover distortion in outer shape-memory polymer film, this composite construction returns to initial smooth contour again, thus realizes the bidirectional reversible transfer of shapes that structure completes " smooth structure → gear-like structure → smooth structure ";
Its gear parameter is regulated by the geometry and physics (such as modular ratio, Poisson's ratio) aspect ratio that change core body and outer membrane; Round platform core can realize special shape gear structural generation.
Shape-memory polymer transition temperature generally about room temperature to 100 DEG C, and regulates by changing crosslink material density, thus utilizes this composite construction to meet actual demands of engineering.
Beneficial effect of the present invention:
1, in micro code-lock field, be often difficult to adopt conventional mechanical method to manufacture the very close small dark gear of minute gear, particularly tooth pitch, and some special shape gear structures (as tooth pitch consecutive variations, spiral beveled wheel etc.).The present invention proposes a kind of mechanical self-assembling method, and without the need to machining, structure can form smooth structure automatically---and the bidirectional reversible of complicated gear structure changes, and this is significant in micromechanics field.
2, conventional shape-memory polymer only has one-way shape memory function, the present invention introduces a kind of physics complex method, can realize two-way shape memory function, this has promotion meaning to the broader applications promoting shape-memory polymer as sensing and exciting element.
Accompanying drawing explanation
Fig. 1 two-way shape memory self assembly spur gear deformation process schematic diagram.
Relation between Fig. 2 gear amplitude and temperature: I, III stage is cylinder, the II stage is gear-like structure.
Fig. 3 two-way shape memory self assembly helical gear deformation process schematic diagram.
Detailed description of the invention
Be that the invention will be further described for embodiment with accompanying drawing:
Embodiment 1
Accompanying drawing 1 two-way shape memory self assembly spur gear deformation process schematic diagram.Composite construction is by the low transition temperature (T of internal layer
g1) shape-memory polymer cylinder core and outer high transition temperature (T
g2) shape-memory polymer film form, the cross sectional radius of shape-memory polymer cylinder core is 10mm, be highly 20mm, the thickness of shape-memory polymer film is 0.5mm, as shown in the figure, the thermodynamic process that this composite construction realizes two-way shape memory self assembly spur gear comprises following 4 steps: (a) is at T > T
g2carry out axial compression loading to this composite cylindrical body under high temperature, because at this moment environment temperature is higher than material shape memory transition temperature, structure is in rubbery state, can realize larger compression; B () keeps this distortion, be cooled to T < T
g1, at this moment internal layer cylinder core and outer membrane are all in glassy state, and structure is freezed, even if remove external force structure still can keep this temporary distortion state; C () is heated to T
g1< T < T
g2, at this moment shape memory cylinder core shrinks and recovers distortion, but outer shape-memory polymer film is still in frozen state, does not thisly mate distortion and causes outer shape-memory polymer film compressive buckling, and gear-like structure is formed; D () continues to be heated to T > T
g2, also there is shape and recover distortion in outer membrane, this composite construction returns to initial smooth cylindrical body profile again, realizes the bidirectional reversible transfer of shapes that structure completes " cylinder → gear-like structure → cylinder ".
Fig. 2 is such composite construction gear amplitude variation with temperature situation calculated according to real material.Wherein internal layer shape-memory polymer cylinder core is prepared by weight 100: 17 by E-51 type epoxy resin and DDM curing agent, and outer shape-memory polymer film is prepared by weight 100: 9: 4 by E-51 type epoxy resin and DDM, m-PDA two kinds of curing agent.In figure, (gear amplitude is zero for corresponding step a, d) stage, illustrates in this temperature range inner structure maintenance smooth cylindrical body profile for I (corresponding step b), III; II (corresponding step c) stage amplitude is non-vanishing, and structure keeps gear pattern, and in this process tooth depth along with temperature generation consecutive variations.
Embodiment 2
Accompanying drawing 3 is two-way shape memory self assembly helical gear deformation process schematic diagram.Its thermodynamic process is similar to embodiment 1, is uniquely frustum cone structure unlike its internal layer core, utilizes this composite construction, can realize tooth pitch continually varying two-way shape memory self assembly helical gear.
Claims (5)
1. the implementation method of the composite construction of a two-way shape memory self assembly gear, the composite construction of described two-way shape memory self assembly gear is made up of the shape-memory polymer core body of internal layer and outer field shape-memory polymer film, and the shape memory transition temperature of shape-memory polymer core body and shape-memory polymer film is respectively T
g1and T
g2, and T
g1<T
g2; It is characterized in that: the method comprises the steps:
1) at environment temperature T>T
g2under condition, initial axial crushing deformation is applied to this composite construction;
2) keep this distortion, be cooled to T<T
g1, realize the shape freezing of initial deformation;
3) T is heated to
g1<T<T
g2, shape-memory polymer core body recovers distortion, outer shape-memory polymer film compressive buckling, formative gear shape structure;
4) T>T is heated to
g2, also there is shape and recover distortion in shape-memory polymer film, this composite construction returns to initial smooth contour again.
2. method according to claim 1, is characterized in that: described shape-memory polymer core body is prepared by E-51 type epoxy resin and DDM curing agent.
3. method according to claim 2, is characterized in that: the weight ratio of E-51 type epoxy resin and DDM curing agent is 100:17.
4. method according to claim 3, is characterized in that: described shape-memory polymer film is prepared by E-51 type epoxy resin, DDM curing agent and m-PDA curing agent.
5. method according to claim 4, is characterized in that: the weight ratio of E-51 type epoxy resin, DDM curing agent and m-PDA curing agent is 100:9:4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210010314.0A CN102555388B (en) | 2012-01-13 | 2012-01-13 | Composite structure of round-trip shape memory self-assembly gear and achieving method thereof |
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| CN201210010314.0A CN102555388B (en) | 2012-01-13 | 2012-01-13 | Composite structure of round-trip shape memory self-assembly gear and achieving method thereof |
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| CN102555388A CN102555388A (en) | 2012-07-11 |
| CN102555388B true CN102555388B (en) | 2015-02-11 |
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| CN107236261B (en) * | 2017-05-24 | 2019-03-12 | 淮阴工学院 | It can be according to the preparation method of the shape-memory polymer film of the spontaneous adjusting translucency of room temperature height |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6315791B1 (en) * | 1996-12-03 | 2001-11-13 | Atrium Medical Corporation | Self-expanding prothesis |
| CN101513932A (en) * | 2009-03-30 | 2009-08-26 | 哈尔滨工业大学 | Deformable aerofoil cover with changeable rigidity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8865310B2 (en) * | 2008-07-29 | 2014-10-21 | GM Global Technology Operations LLC | Polymer systems with multiple shape memory effect |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6315791B1 (en) * | 1996-12-03 | 2001-11-13 | Atrium Medical Corporation | Self-expanding prothesis |
| CN101513932A (en) * | 2009-03-30 | 2009-08-26 | 哈尔滨工业大学 | Deformable aerofoil cover with changeable rigidity |
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