JPH0741340B2 - Method for manufacturing a large number of contour shape objects subjected to shape memory processing - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently manufacturing a large number of contour shape bodies made of a shape memory alloy used as a toy, for example.

2. Description of the Related Art Shape memory alloys are known as one of new functional materials that have been started relatively recently. This shape memory alloy is composed of, for example, an alloy of nickel and titanium, and is subjected to a shape memory treatment in which the alloy is given a desired shape and then heated to a temperature above the austenite transformation end temperature (Af temperature). It is a metallic material that has a unique property of metallically memorizing a given shape. With a shape memory alloy having this characteristic, even if a deformation is given within a predetermined stress range, the shape is instantly restored to the original shape only by heating to a temperature slightly higher than the temperature at the time of the deformation.

In view of the peculiar property of memorizing the original shape of this alloy, various applications have been proposed for each industrial field. For example, this is a seal joint used for aircraft hydraulic pipes, which is to be manufactured at room temperature by making a joint of shape memory alloy slightly smaller than the pipe diameter, expanding the joint diameter to below zero degree, and then joining. A very tight pipe connection is made by fitting the pipe and then leaving it at room temperature to restore its original shape. Further, since the shape changes in response to a temperature change, there is an application example in which it is used as a drive source for urging the opening and closing of a damper of a cool air outlet such as a cooler.

In addition to the practical use described above, various scientific toys have also been proposed that apply their unique properties. As an example, as shown in FIGS. 1 (a) and 1 (b), a wire 10 made of a shape memory alloy is endlessly curved and bent in the same manner as one-stroke writing, for example, a "mouse". Shaped bodies such as "" and "rabbits" (hereinafter referred to as "contour shape bodies") were formed and heated to a temperature above the austenite transformation end temperature (Af temperature) of 400 to 700 ° C to perform shape memory treatment. There are 12 toys. The toy 12 related to this contour-shaped body is already stored in the toy 12 by heating to a required temperature range even if an external force is applied to deform the toy 12 within a range in which a predetermined stress deformation is allowed. Various shapes such as "mouse" and "rabbit" can be revived. Therefore, it is a suitable material for attracting scientific interest and fostering creativity.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, when manufacturing a toy according to the above-mentioned contour shape body, conventionally, the wire rod is strongly sandwiched by pliers, and the wire rod is manually bent into a desired shape, and then shape memory treatment by heating is performed. Need to be applied. However, in order to manufacture a large number of toys of this type, the shape memory alloy has sufficient hardness and rigidity even before the shape memory treatment, so that the manual work requires a great labor, and There was a drawback that the production efficiency was extremely poor.

OBJECT OF THE INVENTION The present invention is made in view of the above-mentioned drawbacks inherent in the production of a contour shape body in which a desired contour shape is imparted to a wire rod made of a shape memory alloy, and is proposed to suitably solve it. It was done without much effort,
Moreover, it is an object of the present invention to provide a method capable of mass-producing contour-shaped bodies at once.

Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the present invention is to implant a linear material made of a shape memory alloy at required intervals so as to exhibit a desired contour shape. A method for manufacturing a contour-shaped body, which is formed by constraining the contour-shaped body by a plurality of pins formed by heating the contour-shaped body constrained to a desired shape to a required temperature and performing a memory process in the shape. In, the linear material is sequentially constrained in a stack to form a large number of contour-shaped bodies along the large number of pins implanted at the required intervals, and the large number of contour-shaped bodies are stacked on the common pin. It is characterized in that, in a state of being constrained in a shape, it is heated to a required temperature to perform a memory process in the shape.

Example Next, a method of manufacturing a large number of contour shape objects subjected to shape memory processing according to the present invention will be described in relation to a jig suitably used for carrying out this method. FIG. 2 shows a schematic structure of the jig 14 in a perspective state.
For example, a large number of pins 18 also made of heat-resistant steel are planted at required intervals on a flat rectangular substrate 16 made of heat-resistant steel at a required pattern described later. The reason why the heat resistance is a requirement for the constituent materials of the substrate 16 and the pins 18 is that it is necessary to perform heat treatment by inserting into a high temperature furnace for shape memory treatment as described later. Therefore, its heat resistance may be, for example, when it is exposed to a high temperature in a furnace, as long as it has sufficient characteristics to withstand this temperature. Even the material can be adopted. The implantation pattern of a large number of pins 18 on the substrate 16 is arranged upright at a predetermined interval so that the set of these pins 18 as a whole exhibits, for example, the "mouse" contour shape shown in FIG. 1 (a), This pattern can be arbitrarily changed according to the object to be formed. Therefore, the contour-shaped body may be a contour-shaped body intended for industrial use other than the above-mentioned use as a toy, for example, a torsion spring for biasing the opening and closing of the damper. The spring-shaped pattern is pinned onto the substrate 16.
Planted by 18.

As shown in FIG. 2, a holding plate 20 made of a heat resistant material is provided separately from the heat resistant substrate 16, and the heat resistant pin 18 is inserted through a through hole 22 formed in the holding plate 20. It may be configured to. In this case, it is needless to say that the pattern of the through holes 22 is made to match the pattern of the heat resistant pins 18 on the corresponding heat resistant substrate 16. Further, in order to easily insert the pin 18 into the through hole 22, a taper 22a is formed around the opening of the through hole 22 on the back surface of the pressing plate 20, and the tip of the heat resistant pin 18 is also sharply formed. It is preferable to set.

Between the many pins 18 of the jig 14 described above, a wire rod 10 made of the shape memory alloy is constrained to have a required shape as described later, and in this state, the wire rod 10 is inserted into a high temperature furnace to store the shape memory. The present invention proposes a heating method in which electric power is directly applied to the contour-shaped body made of the wire rod 10 as a heating means other than the above-mentioned treatment. So in order to deal with this electric heating,
The board 16 and the pins 18 are subjected to an insulation treatment as shown in FIG. 3 to prevent a short circuit accident. That is, the surface of the substrate 16 made of heat-resistant steel is coated with a material 24 (for example, ceramics such as new ceramics) having excellent electric insulation properties and heat resistance to perform insulation treatment on the substrate surface. A portion of the pin 18 made of heat-resistant steel exposed to the outside is also electrically insulated with the same heat-resistant electric-machine insulating material 24.

Procedure for implementing the method of the present invention Next, the procedure for constructing a contour shape body made of a shape memory alloy using the jig thus constructed will be described. First, a wire rod 10 made of the above-mentioned shape memory alloy and having a predetermined diameter that has not been subjected to shape memory treatment is prepared. Then, as shown in FIG. 4, the wire rod 10 is alternately entangled with heat-resistant pins 18 which are planted at a required interval so as to exhibit a desired contour pattern such as "mouse", and the wire rod 10 is placed between the pins 18. To restrain the movement. Therefore, if the implantation pattern of the heat-resistant pins 18 on the substrate 16 is formed so as to have, for example, the shape of the "rat" shown in the drawing, the contour shape body 12 made of the wire rod 10 constrained by the pins 18 is formed. The overall shape is also configured to present a "mouse" contour. As described above, in the present invention, even with the wire rod 10 having hardness and rigidity, the pins 18 standing upright on the substrate 16 are only constrained in order according to a required pattern, so that a great amount of labor is required even manually. There is an advantage that does not require. In this case, the pins 18 are set so that the length and the strength thereof are sufficiently obtained, and as shown in FIG. 5, the insulating wire 10 is used above the individually formed contour bodies 12. If the contoured bodies 12 having the same pattern are successively formed in a laminated manner, a plurality of contoured bodies 12 can be obtained in a form constrained by the common pin 18. In addition, it is preferable to adjust the bending angle and the radius of curvature of the wire rod 10 at the time of restraint by changing the thickness of the pin 18 implanted in the substrate 16.

Next, the contour-shaped body 12 constrained to this desired shape is heated to a required temperature, and a memory is also given to the shape. As one means of this shape memory processing by heating, for example, the contour shape body 12 is used as a substrate in an electric heating furnace.
It is recommended to store the pin in a pin-restricted state and heat it in the temperature range of 400 to 700 ° C for 30 minutes to 1 hour. As another means, as described in FIG. 3, the wire rod 10 is restrained by the board 16 and the heat-resistant pin 18 which have been subjected to the electric insulation treatment, and both ends of the contour shape body formed by the wire rod 10 are required. It is proposed to energize with an electric current. According to this energization heating, the wire 10 made of the shape memory alloy itself generates heat by itself, so that the shape is memorized by controlling the heat generation temperature to the temperature required for the shape memory processing. According to this energization heating, the above-mentioned heating furnace becomes unnecessary, and since only the wire material needs to self-heat, the shape memory treatment can be performed quickly and economically.

As described above, according to the method for manufacturing a large number of contour-shaped bodies that have undergone shape memory processing according to the present invention, a great amount of labor is required when manufacturing a contour-shaped body having a desired contour shape from a wire rod of shape memory alloy. In addition, a large number of contour-shaped bodies can be manufactured all at once. Further, it is possible to perform shape memory treatment by heating to a required temperature while holding a large number of contour-shaped bodies in a stacked state on a common pin, which is advantageous in that the manufacturing efficiency of these contour-shaped bodies is significantly improved. The effect is played.

[Brief description of drawings]

1 (a) and 1 (b) are explanatory views each showing an embodiment of a contour shape body made of a shape memory alloy as a material,
FIG. 2 is a perspective view showing a schematic structure of a jig used for carrying out the method of manufacturing a contour shape body subjected to shape memory processing according to the present invention, and FIG. 3 is a longitudinal section of the jig according to another embodiment. FIGS. 4 and 5 are explanatory perspective views showing a state in which a wire made of a shape memory alloy is restrained by a jig, and FIG. 5 is a state in which a plurality of contour-shaped bodies are restrained in a layered manner on pins implanted in a substrate. It is a longitudinal cross-sectional view showing a state of doing. 10 …… Wire rod, 12 …… Contour body 14 …… Jig, 16 …… Board 18 …… Pin

Claims (3)

[Claims] 1. A linear material (10) made of a shape memory alloy.
Is constrained by a large number of pins (18) that are planted at required intervals so as to exhibit a desired contour shape to form a contour shape body (12), and the contour shape body (12) constrained to this desired shape In the method for manufacturing a contour-shaped body, which is configured to be heated to a required temperature to perform a memory treatment in the shape, a large number of pins (18 along the linear material (10) are implanted at the required intervals. A large number of contour-shaped bodies (12) are formed by sequentially restraining them in a stacked manner, and these many contour-shaped bodies (12) are connected to the common pin (18).
A method of manufacturing a large number of contour-shaped bodies that have been subjected to shape memory processing, characterized in that the shape memory processing is performed by heating to a required temperature while performing the memory processing in the state of being constrained in a laminated state. 2. A plurality of contour-shaped bodies (12), which are stacked on the common pin (18) and are constrained to have a desired shape, are placed in a furnace, and a temperature range of 400 ° C. to 700 ° C. The method for manufacturing a large number of shape-memory-shaped contour-shaped bodies according to claim 1, wherein the heating is performed in the range of minutes to 1 hour. 3. A large number of contour-shaped bodies (12), which are laminated in the common pin (18) and are constrained to have a desired shape, are energized at both ends thereof to be internally heated in a temperature range of 400 ° C. to 700 ° C. The method of manufacturing a large number of contour-shaped bodies that have been subjected to shape memory processing according to claim 1, wherein the method is heated by heat generation.