JPS597011A - Method of molding resin item - Google Patents

Abstract

PURPOSE:To obtain easily a resin molded item of a desired shape without requiring any complicated means and with the loading operation of the resin quite ready, by using a specified mold having a configuration memory alloy embedded therein integrally. CONSTITUTION:The mold 1 having a molding groove 2 is made of a material (e.g. resins, rubbers, etc.) whose softening temperature is relatively high and that can be plactically deformed, the configuration memory alloy (e.g. Ni-Ti alloys, etc.) 3 that has memorized the intended configuration for the intended resin item is integrally embedded in said mold, and when the modling is carried out the mold is straightened, the resin material 4 is loaded into the molding groove 2, and the mold is heated to a prescribed temperature to regain the memorized configuration thereby to obtain the intended item. The mold can be repeatedly employed. The heating is carried out at a temperature 100-900 deg.C at which the resin material is softened and the memory configuration alloy regain the memorized configuration, and if the heating temperature is 500 deg.C, it is preferable to carry out the molding under an atmosphere free of oxygen.

Description

[Detailed description of the invention] This relates to the forming force method.

Conventionally, there is no means for molding resin products using shape-n self-memory alloys. There are many types of shape memory alloys, but in practical terms they are alloys of nickel and titanium. After plastic deformation is applied to this alloy, heating it to a predetermined temperature returns it to its shape before plastic deformation. There is one quality, and this property is used to mold resin products.

An object of the present invention is to provide a method for easily molding a resin molded product in a desired shape without using complicated equipment.

The present invention, which was made to achieve this object, forms a mold that cures the molding groove with an efficiency that has a relatively high softening temperature and is capable of correcting plastic deformation force, and forms a mold inside the mold. A shape memory alloy that memorizes the shape of the resin phase O-1 to be molded is integrally embedded, and during resin molding, the mold is stretched approximately linearly and the molding grooves are filled with resin thorns to form a predetermined shape. A method for molding a resin product, characterized in that the mold is returned to a memorized shape based on the shape recovery properties of a shape memory alloy when heated to a temperature, and the filled resin is molded into a predetermined shape. For example, it is made of resin or special rubber, and a shape memory alloy is embedded inside it.It is a complicated process that requires only filling the groove of the mold with a specified resin 4'A and heating it to a specified temperature. (7) The present invention will be explained in more detail with reference to the illustrated embodiment. 1 is a mold; It has a channel shape with grooves 2, and a rod-shaped metal rod 3 made of a shape memory alloy is integrally embedded inside.

The mold 1 is made of, for example, resin or comb, and has a relatively high softening temperature and is capable of plastic deformation. The metal rod 3 is also made of an alloy of nickel and titanium, generally known as T1Ni alloy. The metal rod 3 is stored in the shape shown in FIG. 3, and the mold 1 is formed accordingly.

The mold thus formed is heated at room temperature or low temperature,
As shown in FIG. 4, it is plastically deformed in a substantially straight line. In this deformed state, the molding groove 2 is filled with resin material 4 and then heated to a predetermined temperature.

Although this heating varies depending on the type of alloy, the temperature is such that the fourth resin material to be processed is softened, the mold is also softened, and the shape of the memory alloy is restored to its original shape. However, the temperature is much higher than the softening point of the resin phase. This temperature ranges, for example, from 100 to 900 degrees Celsius, and if the temperature exceeds 500 degrees Celsius, the metal rod should be heated in a vacuum or in an incurable gas atmosphere to prevent oxidation. do.

By heating in this way, the metal rod 3 returns to its original shape, and the mold 1 also returns to its original shape that held the resin material 4, that is, the same shape as shown in FIG. 1, and the resin material 4 also returns to its original shape. Softening 1-
Because it is curved, it follows that shape and bends into the planned shape. If you stop heating and let it cool in this state, the resin material 4
The material also hardens and is molded into approximately the same shape as a metal rod.

Then, it is sufficient to release the mold from the mold 1 after the resin material has hardened. In this way, the mold is placed at room temperature or at a low temperature.
Alternatively, it can be plastically deformed at a predetermined temperature, for example, a temperature below the martenzite transformation start temperature, and can be formed into a linear shape and used repeatedly.

As explained below, the method for molding a resin product according to the present invention involves making a mold using a material having a high softening temperature and being capable of plastic deformation, and integrally embedding a shape memory alloy inside the mold. However, since the shape recovery property of the memory alloy is utilized, a resin molded product with a complicated shape can be easily obtained, and when filling the resin material, the entire mold can be formed into a substantially straight shape.
This makes filling work extremely easy.

Furthermore, since a shape memory alloy is used, there is no need for complicated equipment; all that is needed is a plastic deformation means and a heating means for the forming mold, which reduces equipment costs and allows for the production of products with complex shapes and narrow margins. It has the excellent effect of being able to easily process pipes of various shapes.

[Brief explanation of drawings]

Fig. 1 is a plan view of a final mold for carrying out the method of the present invention, Fig. 2 is a plan view of a shape memory alloy embedded in the same mold, and Fig. 3 is the In-DI line of Fig. 1. A cross-sectional view, Fig. 4 is a plan view of the same mold after it has been plastically deformed into a straight shape and the molding groove is filled with resin material, and Fig. 5 is a plan view of the same mold after it has been filled with the resin material shown in Fig. 4 and heated. FIG. 6 is a plan view of the mold having returned to its original shape, and FIG. 6 is a plan view of the molded resin material. 1... Molding mold made of a material capable of plastic deformation 2... Molding groove 3... Metal rod 4 made of shape memory alloy...
...Resin moon phase patent applicant Stanley Electric Co., Ltd.
Akimoto Fujiimo 1゜Figure 3 = 49-

Claims (1)

[Claims] A mold having a molding groove is formed in A'A, which has a relatively high softening temperature and is capable of plastic deformation, and a shape memory alloy that memorizes the shape of the resin material to be molded is integrated inside the mold. During resin molding, the mold is stretched approximately linearly to fill the molding groove with resin, and by heating to a predetermined temperature, the mold is shaped into a memorized shape based on the shape-returnability of the shape-memory alloy. A molding force method for resin products, which involves returning and molding the filled resin into a predetermined shape.