Apparatus and method for continuously casting copper base shape memory alloy wire

A technology of memory alloy wire and alloy wire, which is applied in the field of equipment for continuous casting of copper-based shape memory alloy wire, and can solve problems such as alloy wire cracks

Inactive Publication Date: 2008-07-16
黎沃光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of the existing hot-type continuous casting process is that when the alloy wire is solidified in the mold, it will rub against the mold, causing cracks on the surface of the alloy wire, as shown in Figure 2, so that the alloy wire cannot be used in practice

Method used

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  • Apparatus and method for continuously casting copper base shape memory alloy wire

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Effect test

Embodiment 1

[0031] In this embodiment, a Cu-Al-Ni alloy containing 13.95 wt% of Al, 3.95 wt% of Ni and the remainder being Cu is continuously cast at a speed of 240 mm / min into a wire with a diameter of 0.7 mm. The distance h between the liquid level of the alloy liquid 1 and the molding cavity of the mold 3 is 30mm, the temperature of the mold is set at 1100°C, and the distance between the cooler and the mold is 5mm. Metallographic examination showed columnar grain structure. Alloy wire is super elastic. The number of bending fatigue fractures in the as-cast state is 16,000 times, and the number of bending fatigue fractures after solution treatment is 14,000 times.

Embodiment 2

[0033] In this embodiment, a Cu-Al-Ni alloy containing 13.22wt% Al, 3.95wt% Ni, and the remainder being Cu is continuously cast into wires with a diameter of 1mm at a speed of 108mm / min. The distance h between the liquid level of the alloy liquid 1 and the molding cavity of the mold 3 is set to 20mm, the mold temperature is set to 1075°C, and the distance between the cooler and the mold is 13mm. The alloy wire has shape memory properties, and the metallographic examination shows that it is a columnar grain structure. After solution treatment, under a fixed strain of 4%, it is stretched and heated cyclically to restore its original length until fatigue fracture occurs. The highest number of stretches at break is 38560 times. The shape recovery rate after heating was 100% throughout the tensile test. It fully demonstrates that the memory alloy wire produced by the invention has excellent mechanical properties, memory properties and fatigue properties.

Embodiment 3

[0035] In this embodiment, a Cu-Al-Ni alloy containing 13.95wt% Al, 3.95wt% Ni and the remainder being Cu is cast at a speed of 500mm / min into a wire with a diameter of 2mm. The distance h between the liquid level of the alloy liquid 1 and the molding cavity of the mold 3 is set to 5mm, the mold temperature is set to 1050°C, and the distance between the cooler and the mold is 6mm. The alloy wire has superelasticity in the as-cast state. Metallographic examination shows that it is fine-grained columnar grain structure. The number of bending fatigue fractures in the as-cast state is 20,000 times.

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Abstract

The invention relates to an equipment of continuous casting memory alloy wire of Cu-based shape and a production method thereof. The equipment of the invention comprises a heater provided on cast mould, guiding wires and a cooler; one end of the cast mould is introduced into alloy liquid, the height of which is higher than the molding cavity of the cast mould; the other end of the cast mould is inserted with guiding wire that is bound with liquid column flowing out of the molding cavity and drawn by a drawing mechanism; the cooler is arranged between the cast mould and the drawing mechanism. The steps of the invention are that: 1) heating the cast mould to 1050-1100 DEG C; 2) alloy liquid entering the molding cavity from one end of the cast mould and the other end being inserted with guiding wire; after the guiding wire and alloy liquid are bound; the drawing mechanism is started to form a suspending liquid column out of the molding cavity of the cast mould; the liquid column is cooled by the cooler arranged outside of the cast mould, leading the liquid column to be solidified into guiding wire in vertical direction. By adopting the equipment of the invention, surface crack and wave-shaped tortuous can be avoided. The invention is of simple operation method and convenient use.

Description

Technical field: [0001] The invention relates to a manufacturing equipment and method for shape memory alloy profiles, in particular to equipment and a method for continuously casting copper-based shape memory alloy wires, and belongs to the transformation of equipment and methods for continuously casting copper-based shape memory alloy wires technology. Background technique: [0002] At present, the known manufacturing process of copper-based shape memory alloys is to melt and cast the alloy into ingots, and then process the alloys into filaments, strips and other profiles through plastic processing methods such as drawing, extrusion or calendering. The product made by this method has a non-directional polycrystalline structure in its internal structure. Since the elastic anisotropy coefficient of copper-based alloy crystals is as high as 13 to 15, the strains of adjacent grains in the polycrystalline structure are inconsistent during deformation, and stress concentration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/14
Inventor 黎沃光
Owner 黎沃光
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