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Shape memory alloy driving element

A technology of memory alloy and driving components, which is applied in the direction of machines/engines, mechanisms that generate mechanical power, mechanical equipment, etc., and can solve the problem that the volume of the intelligent actuator system cannot be further reduced, affects the accuracy of the actuator, and the design of the reed structure is complex, etc. question

Pending Publication Date: 2022-03-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the design process of shape memory alloy smart actuators, the design and selection of springs or reeds often bring troubles, and there are several problems: 1) The volume of the smart actuator system cannot be further reduced, and the shape memory is weakened The biggest advantage of the alloy intelligent actuator; 2) There are fundamental defects in the mechanical corresponding form of the spring, especially in the low strain mode, the stress and displacement are not linear; and when the stra

Method used

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Examples

Experimental program
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Example Embodiment

[0085] Example 1

[0086] Select Ni 50.2 Ti 49.8 Shape memory alloy wire, continuous cold drawn, lowered the diameter of the wire, which makes it a fiber, and the fibers have a diameter of 1 mm. In the multi-channel cutting process, the first annealing process is performed between the adjacent two steps. In addition to the end cold drawing process outside the end cold drawing process, processing of 3 mold processing, single cold drawing, and the first annealing treatment is heated as a protective atmosphere. The temperature of the first annealing treatment was 450 ° C, and the time was 30 seconds, and the wire was pulled into a fiber having a diameter of 0.2 mm. After machining at 9% reduction rate, the first annealing treatment is no longer carried out, and only the non-crystalline / crystal correction structure is obtained. The intensity of non-crystalline / crystalline complex structure is ≥1800MPa, and the strain is ≥4%.

[0087] Then, the shape memory alloy fibers are divided...

Example Embodiment

[0089] Example 2

[0090] Select Ni 50.2 Ti 49.8Shape memory alloy wire, continuous cold drawn, lowered the diameter of the wire, which makes it a fiber, and the fibers have a diameter of 1 mm. In the multi-channel cutting process, the first annealing process is performed between the adjacent two steps. In addition to the end cold drawing process in the end cold drawing process, the processing of 6% reduction is processed, and the single cold pull is pulled out of 3 mold processing. The first annealing treatment is heated as a protective atmosphere. The temperature of the first annealing treatment was 400 ° C, and the time was 40 seconds, and the wire was pulled into a fiber having a diameter of 0.03 mm. After processing at a 7% reduction rate, the end cold drawing process is not processed, and only the first annealing treatment is carried out, only the obtained shape memory alloy fiber is straightened, and the non-crystalline / crystal correction structure is obtained. The intens...

Example Embodiment

[0093] Example 3

[0094] Select Ni 45 Ti 50 Cu 5 The shape memory alloy wire material is continuous, and the diameter of the wire material is continuous, so that it is fiber, the fiber has a diameter of 1.5 mm. In the multi-channel cutting process, the first annealing process is performed between the adjacent two steps. In addition to the end cold drawing process in the end cold drawing process, the processing of 6% reduction is processed, and the single cold pull is pulled out of 3 mold processing. The first annealing treatment is heated as a protective atmosphere. The temperature of the first annealing treatment was 550 ° C, the time was 30 seconds, and the wire was pulled to a fiber having a diameter of 0.1 mm. After machining at the end cold drawing process, the first annealing treatment is no longer carried out, and only the non-crystalline / crystal complex structure is obtained. The intensity of non-crystalline / crystalline complex structure is ≥1800MPa, and the strain is...

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Abstract

The invention provides a shape memory alloy driving element which is made of a shape memory alloy material and comprises a driving execution section and a restraining section, a shape memory alloy in the driving execution section has a crystal structure, and a shape memory alloy in the restraining section has an amorphous/crystal multiphase structure. The invention further provides a machining process of the shape memory alloy driving element. The shape memory alloy driving element provided by the invention has a dual microstructure, can be used for intelligent execution devices such as a thermostatic valve and a high-temperature alarm, realizes accurate control from millimeter level to micron level, and provides a key element material for microelectronic devices, minimally invasive surgical instruments and micro/nano-level medical robots.

Description

technical field [0001] The invention belongs to the field of alloy materials, and relates to a shape memory alloy driving element, in particular to a shape memory alloy driving element and a processing technology thereof. Background technique [0002] As the demand for miniaturization of sensing and actuators in the fields of aerospace, precision machinery, consumer electronics, medical equipment, and robots continues to increase, a series of "mechanics-function integration" smart materials have been developed for micro actuators . Among them, shape memory alloys integrate displacement & temperature sensing and large strain driving functions. In terms of electric power and braking, shape memory alloy torsion springs and linear motion actuators are now effective alternatives to electric motors because they have the ability to achieve traditional actuators. Inherent potential for mass and volume savings not achievable with compactors. [0003] Shape memory alloy intelligent ...

Claims

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Application Information

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IPC IPC(8): F03G7/06C22F1/00C22F1/18
CPCC22F1/006C22F1/183
Inventor 金明江李雅陈琦文田文迪金学军
Owner SHANGHAI JIAO TONG UNIV
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