JPS62152577A - Manufacture of colored shape memory alloy wire - Google Patents

Abstract

PURPOSE:To easily color and enhance decorativeness by coating the coating medium for coloring and printing before wire drawing and shape memory- treating the Ni-Ti alloy wire. CONSTITUTION:An Ni-Ti alloy wire consists of Ni of 50-60wt% and Ti of 40-50wt%, or part of Ni and Ti in said alloy wire replaced by one element or more than two elements such as Cu, Al, Zr, V, Co, Fe, etc., totalling 0.05-10wt%. The coating medium comprising fluorine resin and the like as main raw material, into which the coloring agent for desirable color is mixed, is continuously coated over the surface of said alloy wire and printed. Next, wire drawing is carried out by using a continuous wire drawing machine, lubricant and dies, and a colored shape memory alloy wire thus prepared is made into a coil-shaped spring, heated up around 30min at the temperature of 400 deg.C and shape memory-treated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for manufacturing a colored shape memory alloy wire used as a coil spring.

[Prior art] Conventionally, the material of shape memory alloy coil springs has been Ni-T.
It is often an i-alloy. Coil springs made of such materials cannot be plated or washed with acid.
This is undesirable because it causes hydrogen gas to enter. Also,
Applying paint to the surface of a coil spring is extremely time-consuming, and the drying temperature of the paint film is often in the transformation temperature range of shape memory alloys, resulting in unsatisfactory paint film formation. If the coil spring is a thin and close-fitting spring, the coils of the spring will be in close contact with each other, making it impossible for the paint to soak in and making it almost impossible to apply the paint. Ta.

[Problems to be Solved by the Invention] Therefore, conventional coil springs made of shape memory alloys have scale attached to their surfaces and are not aesthetically treated, and are particularly difficult to decorate when used for interior parts. It was lacking in quality.

In addition to being decorative, there is also the advantage that if the coil springs are colored in different colors depending on the type, they can be easily identified.

This invention focuses on the fact that a colored shape memory alloy coil spring can be obtained by coloring a shape memory alloy wire, which is a raw material before being processed into a coil shape. An object of the present invention is to provide a method for producing a colored shape memory alloy wire for coil processing.

[Means and effects for solving the problems] In the method for producing a colored shape memory alloy wire of the present invention, 50 to 601 ff.
t%(7)Ni t40-501ffi%(7)Ti
or a part of Ni or Ti in the Ni-Ti alloy wire consisting of Cu, A IIL,
1 selected from the group consisting of Zr, V, Co and Fe
It is characterized by applying a paint for @ color to the surface of the Ni-1"i alloy wire substituted with a species or two or more elements at a total concentration of 510°05 to 10% by weight, baking it, and then drawing it. It is said that

Examples of the paint used in the present invention include those whose main raw material is a fluororesin such as tetrafluoroethylene resin or trifluorochloroethylene resin. The paint is mixed with an inorganic or organic colorant of the desired color.

Hereinafter, in order to explain the steps of the manufacturing method of the present invention, an example of the steps will be shown in the drawings. First, a surface treatment is applied to the soft material that has been repeatedly softened and drawn. In the surface treatment step, scale and the like on the surface are removed by polishing, such as lapping, to reveal a pure metal surface. next,
Heat-resistant paint is continuously applied to the surface of softwood, and after application, the paint film is baked in a furnace. Next, using a continuous wire drawing machine or the like, wire drawing is performed using a lubricant and a die.

The above steps are the manufacturing method of the present invention, and the colored shape memory alloy wire manufactured in this way is further processed into a spring shape into a coil shape. In this spring processing step, the colored shape memory alloy wire obtained by the manufacturing method of the present invention exhibits good coiling properties, partly because the coating film on its surface has been wire drawn. After this spring processing, shape memory processing is performed. Usually, this shape memory treatment is performed at 400℃ for 3
This is carried out by heat treatment for about 0 minutes, but even with this heat treatment, the color of the coating film applied by the manufacturing method of the present invention hardly changes.

[Example] Example 1 A soft material having a diameter of 0.875 mm was produced from a wire made of a Ti-54.8% by weight Ni alloy by repeating softening and wire drawing.

Next, the surface scale of this soft wood was removed by lapping to expose the metal surface, and a red material of heat-resistant paint Polyflon (trade name: manufactured by Daikin Industries, Ltd.) was continuously applied thereon. Next, the coating film that was applied through the furnace was baked.

Thereafter, using a continuous wire drawing machine, the wire was finished to a diameter of 0.695 mm using a lubricant and a die. The shape memory alloy wire colored red thus obtained was made into a coiled spring with an inner diameter of 2 and Qn+m. At this time, this alloy wire showed good coiling properties. Next, this coiled spring was subjected to shape memory treatment at 400° C. for 30 minutes. Even with this shape memory treatment, the color of the surface coating film hardly changed.

A soft material with a diameter of 0.91 mm was prepared from a wire made of TuM4'A and a Ti-54, 9% by weight Ni alloy. The scale on the surface of this soft wood was removed by lapping, and a green material of heat-resistant paint Polyflon (trade name: manufactured by Daikin Industries, Ltd.) was continuously applied thereon, and the material was passed through a furnace and baked.

During this process, the alloy wire was heated at 400°C for 30 minutes while being held in a straight state. When the extracted alloy wire was bent at an angle of nearly 30 degrees Celsius and then heated to 60 degrees Celsius by applying hot air to that part, it returned to its original straight shape. From this, it was possible to apply paint to the surface. It was confirmed that the alloy wire baked with Membrane 5 exhibited the same shape memory effect as the original alloy wire and was operational.

11 Test ■ 1-1 wire of shape memory alloy wire made of 45.4 wt% xi-5.1 wt% Cu alloy, colored by coating one surface with paint in the same manner as Example 1. Ta. This colored shape memory alloy wire showed good coiling properties during spring processing, and its color hardly changed even after shape memory treatment at 400° C. for 30 minutes.

In this Example 3, a Ni-Ti alloy wire to which Cu is added is shown, but the same effect of the present invention is exhibited also to a Ni-Ti alloy wire to which other metals such as AHLZr, V, Co, or Fc are added. I would like to make it clear here that this is a rip-off.

[Effects of the Invention j] In the IJ manufacturing method of the present invention, a paint for coloring is applied and baked before wire drawing or shape memory treatment. Therefore, compared to a method in which a paint is applied after forming a coil, it is possible to color the coil easily and without much effort. Furthermore, since the film has not been subjected to shape memory treatment, heating during drying of the coating film does not pose a problem. Furthermore, the colored shape memory alloy wire obtained by the production method of the present invention exhibits excellent coiling properties during processing such as spring processing.

From the above, the colored shape memory alloy wire produced by 1q by the manufacturing method of the present invention can be effectively used as a material for shape memory alloy coil springs used in interior parts and other parts that require decoration. .

It is also useful for applications that require color-based management.

[Brief explanation of drawings]

The drawings are process diagrams showing an example of the steps of the manufacturing method of the present invention. Patent applicant Sumitomo Electric Industries Co., Ltd. Representative Patent attorney Kuji Fukabe
Hey (2 others)

Claims (2)

[Claims] (1) 50-60% by weight of Ni and 40-50% by weight of T
Ni-Ti alloy wire consisting of i, or a part of Ni or Ti in the Ni-Ti alloy wire with Cu, Al, Zr,
After applying a coloring paint to the surface of a Ni-Ti alloy wire substituted with a total of 0.05 to 10% by weight of one or more elements selected from the group consisting of V, Co, and Fe and baking it. , a method for producing a colored shape memory alloy wire, characterized by subjecting it to wire drawing. (2) The colored shape memory alloy wire according to claim 1, characterized in that the paint is a heat resistant paint that does not change color even during a shape memory treatment process of 400° C. for 30 minutes. manufacturing method.