Heat-treatment method and equipment for nickel-titanium shape memory alloy

Abstract

The invention provides a heat-treatment method and an equipment for nickel-titanium shape memory alloy, relating to a method for preparing nickel-titanium shape memory alloy wire with functional continuous gradients. The method comprises the steps of preheating the nickel-titanium shape memory alloy wire, placing the nickel-titanium shape memory wire in a tuner pyrosphere of a high-frequency induction heating machine which forms continuous heating temperature with different temperature gradients due to gradual change of fire of the pyrosphere, heating, keeping temperature and annealing for a specified time. The equipment is characterized in that a plurality of tuner pyrospheres of the high-frequency induction heating machine are assembled into a pyrisphere group coaxially; all pyrispheresare gradually equidifferent to form the heating temperature of continuous different temperature gradients. Alternatively, the tuner pyrosphere of the high-frequency induction heating machine is enwound as spiral coils; and the alloy wire is heated under continuous different temperature gradients by the gradual change of pyrosphere diameter or pyrosphere pitch or the combination of the diameter andthe pitch. The heat-treatment equipment is special, simple, convenient and practical, the process step is few, the time is short, the efficiency is high, and the heat-treatment equipment is applicable to the production and application of high-class nickel-titanium shape memory alloy glasses frame part.

Description

technical field [0001] The invention relates to a heat treatment method and equipment for a nickel-titanium shape memory alloy. It relates to the preparation of nickel-titanium shape memory alloy wires with continuous functional gradient. Background technique [0002] Nickel-titanium shape memory alloys have excellent shape memory effect and superelasticity. With the wide application in many industries now and in the future, other functional specificities of nickel-titanium shape memory alloys also have great research and development needs. Especially in industries that have functionally specific requirements for nickel-titanium shape memory alloys, such as aerospace smart components, medical devices, instruments, and high-end spectacle frame parts. Since nickel-titanium shape memory alloy is a functional material, its functional continuous gradient performance is a major development and application direction of its functional specificity. [0003] In the spectacle frames ...

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Problems solved by technology

[0004] The above-mentioned example of making glasses legs, because the nickel-titanium shape memory alloy wire rod that needs to be processed has a small diameter and short length, especially when it is a local section of the nickel-titanium shape memory alloy wire rod that needs to be processed, if the existing Heat treatment methods and process equipment, such as heating and heat preservation in the furnace with the existing ordinary heating furnace, can not realize the heating and heat preservation of the alloy wire with a gradient of temperature difference;

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