JPH022485Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Purpose of the Invention] The present invention consists of a long composite material having a sheathing material having a substantially rectangular cross-sectional shape and a core wire eccentrically arranged in the sheathing material. The present invention relates to an extrusion manufacturing apparatus for manufacturing the above-mentioned composite material, such as an aluminum stabilized superconducting wire, having a structure consisting of the following by an extrusion coating method.

Conventionally, in the field of manufacturing electric wires and cables, aluminum sheathed cables and aluminum-coated steel wires are known as composite materials, but these are both made of a core wire coated with aluminum in concentric circles. It is.

By the way, research on superconducting materials has progressed in recent years, and many compound materials and alloy materials have been discovered, such as
Nb-Ti alloys and the like have already been put into practical use as electrically, magnetically, or thermally stable wire rods.

As a specific example of something that was put into practical use,
There is a superconducting coil described in Publication No. 46391. As explained in detail in the same publication, a degradation phenomenon in which a superconductor transitions from a superconductor to a normal conductor may occur in the superconducting wire. When the degradation phenomenon occurs, a large current close to the critical current density during superconductivity flows through the superconducting material that has become normal conductive, resulting in a situation where the large current cannot be passed. For this reason, superconductor wires are usually
It has a composite structure embedded in normally conductive metals such as copper and aluminum, which exhibit good electrical and thermal conductivity at low temperatures.

As a result, in steady state, current is mainly passed through the superconducting strands, and when a degradation phenomenon occurs, current is temporarily passed through the normally conducting metal around the strands to quickly bring the strands into a superconducting state. recovery and prevent the normal conductivity of the wire from spreading to other parts,
This allows the superconducting state to be stably maintained. In this case, the normal conducting metal requires a cross-sectional area several to several tens of times larger than that of the superconducting wire in order to stabilize the superconducting wire. For this reason, the current density of such a composite material becomes an extremely smaller value than the current density of the superconducting wire itself, and the problem has been that the desired magnetomotive force cannot be obtained. Therefore, in order to efficiently obtain this magnetomotive force, the invention described in the above-mentioned publication employs a method in which superconducting strands are unevenly distributed and buried in a normal conductive metal.

Conventionally, composite materials with such special structures have been manufactured by methods such as rolling and drawing. However, these methods are time-consuming to operate, and require skill in setting processing conditions and controlling equipment in order to obtain composite materials with precise structures, so they cannot be considered efficient manufacturing methods. It is also possible to apply the various methods of manufacturing coated wires (extrusion coating method) listed at the beginning. However, in the case of such composite materials, unlike the case where the coating material is extruded and coated concentrically on the core wire, this method also requires a nipple for inserting and guiding the core wire, a supply path for the coating material, and an extrusion molding die. The problem is that the flow pressure on the core wire of the coating material flowing through the compartment-formed mold container is not uniform, and the core wire is pushed and bent in a direction perpendicular to the extrusion direction due to the imbalance in pressure. occurs.

This will be explained using drawings. Fig. 1a is a cross-sectional view of the mold container in the extrusion device, showing the running of the core wire and the flow of the coating material during extrusion coating molding, and Fig. 1b is the same Fig. 1a. Figure 1c is a cross-sectional view taken along line CC in the previous two figures. In FIG. 1c, the arrows indicate the direction of flow of the dressing as well as the strength of the flow. In the figure, 1 is a composite material, 11
1 is a coating material, 12 is a core wire eccentrically arranged in the coating material 11, 21 is a core supply nipple, 22 is an extrusion molding die, and X and X' are short sides of the composite material 1 shown in FIG. 1c. The direction of flow of the coating material 11 is shown. Y and Y' indicate the flow direction of the coating material 11 flowing toward the long side of the composite material 1 shown in FIG. 1c,
Indicates the direction perpendicular to the X and X' directions. As seen in Figure 1 a and b, the flow of the dressing material in the X direction is
It can be seen that it is significantly larger than that in the X' direction, and that the Y and Y' directions are almost the same. As a result, a pressure imbalance occurs in the flow of the sheathing material against the core wire, as shown in FIG. A problem arises in that the covering material 11 is pushed and bent in the direction of the arrow after molding. As a result, in the case of superconducting materials, the superconducting properties deteriorate,
Sometimes a problem arises in which the core wire breaks during extrusion coating. In order to perform extrusion molding by controlling the flow condition of the coating material in response to eccentricity or changes in the cross-sectional area around the core wire, attempts have been made to create a special structure for the shape of the bearing part of the extrusion molding die. Finding the optimal structure is difficult and requires a lot of trial and error.

In view of the above, an object of the present invention is to provide a mold container defined by a nipple for inserting and guiding the core wire, a coating material supply path, and an extrusion molding die without changing the structure of the bearing part of the extrusion molding die. With the shape of the inner wall surface of By doing so, it is an object of the present invention to provide an apparatus for extrusion manufacturing a composite material, which can prevent the core wire or the covering material from being pressed and bent.

[Summary of the invention] The gist of the invention is that the structure of a long composite material is composed of a sheathing material having a substantially rectangular cross-sectional shape and a core wire eccentrically arranged in the sheathing material. In an extrusion manufacturing device that manufactures composite materials by extrusion coating molding, the shape of the inner wall surface of a mold container defined by a nipple through which the core wire is inserted, a supply path for the coating material, and an extrusion molding die is Therefore, the flow direction of the extrusion of the coating material is controlled, and the flow direction of the extrusion of the coating material controlled here is mostly perpendicular to the long side of the rectangle described above, and the flow direction of the extrusion of the coating material is mostly perpendicular to the long side of the rectangle described above. An apparatus for extruding a composite material is characterized in that there is only a slight flow perpendicular to the flow direction.

[Example] Figures 2a, b, and c show specific examples of the extrusion manufacturing apparatus according to the present invention. In the figure, 11 is a coating material, 12 is a core wire eccentrically arranged in the coating material 11, 21 is a core wire supply nipple, and 22 is an extrusion molding die.

Figures 2a, b, and c correspond to Figures 1a, b, and c, respectively. According to Figure 2 a, X,
It can be seen that the opening of the supply path for the coating material 11 in the X' direction is extremely narrow, and the flow of the coating material 11 from this direction is slight. FIG. 2b shows the supply path in the Y and Y' directions, and it can be seen that the coating material 11 flows in a concentrated manner here.

The shape of the inner wall surface of the mold container (extrusion device) defined by the nipple 21 through which the core wire 12 is inserted and guided, the supply path for the coating material 11 described above, and the extrusion molding die 22 is shown in FIGS. 2a and 2b. Therefore, the flow direction and flow pressure of the coating material 11 relative to the core wire 12 are as shown in FIG. 2c. As a result, the pressure from the directions of X and X′ is Y,
It is extremely small compared to the pressure from the Y' direction, and is not enough to move the position of the core wire. On the other hand,
It can be seen that the pressure from the Y and Y' directions is extremely large due to the shape of the supply path, and is the main extrusion force for the coating material.

In other words, it can be seen that the flow from the X and X' directions is small and the extrusion pressure is small, but the flow from the Y and Y' directions is large and the extrusion pressure is also large. Further, the pressure in the X direction and the pressure in the X' direction are balanced, and the pressure in the Y direction and the pressure in the Y' direction are balanced.

It is clear that if the coating material 11 can be made to flow in this manner within the mold container, the core wire 12 or the coating material 11 will not be bent.

Examples of the core wire used in the present invention include NiTi alloy as an alloy-based superconducting material, and Nb ₃ Sn alloy as a compound-based superconducting material.

Further, metals such as copper, aluminum, etc. are used as the covering material.

[Effects of the invention] According to the extrusion manufacturing apparatus of the invention, as described above, the inner wall surface of the mold container defined by the nipple for guiding the core wire, the supply path for the coating material, and the extrusion molding die. The shape thereby skillfully controls the flow direction of the extrusion of the cladding material, where the flow direction of the extrusion of the cladding material to be controlled is mostly perpendicular to the long sides of the rectangle described above, Since the flow perpendicular to the short side of the rectangle mentioned above is slight, the problem of pressing and bending the core wire and coating material can be solved by an extremely simple and rational method without changing the structure of the bearing part of the extrusion molding die. can do.

Furthermore, when the extrusion apparatus of the present invention is applied to the production of superconducting materials, there is an effect that the superconducting materials can be produced without deteriorating or cutting them.

[Brief explanation of drawings]

Figures 1a, b, and c are conceptual diagrams showing the shape of the inner wall surface of the mold container and the flow of the coating material in a conventional extrusion manufacturing device, respectively, and Figures 2a, b, and c are conceptual diagrams showing the state of the flow of the coating material in a conventional extrusion manufacturing device, respectively. FIG. 3 is a conceptual diagram showing the shape of the inner wall surface of the mold container and the flow of the coating material in the extrusion manufacturing apparatus according to the example. 1: Composite material, 11: Covering material, 12: Core wire, 2
1: Core wire supply nipple, 22: Extrusion molding die,
X, X′: direction of flow of composite material and direction of pressure,
Y, Y': Directions perpendicular to directions X, X'.

Claims (1)

[Scope of utility model registration request] In an extrusion manufacturing apparatus for manufacturing a long composite material by an extrusion covering molding method, the structure of the long composite material consists of a covering material having a substantially rectangular cross-sectional shape and a core wire eccentrically arranged in the covering material. The shape of the inner wall surface of the mold container defined by the nipple through which the core wire is inserted and guided, the supply path for the coating material, and the extrusion molding die controls the flow direction of the extrusion of the coating material. The flow direction of the extrusion of the coating material controlled here is that most of the flow is perpendicular to the long sides of the rectangle described above, and only a small amount of flow is perpendicular to the short sides of the rectangle described above. Features: Composite material extrusion manufacturing equipment.