JPS604553B2 - How to connect cable tensile strength members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting cable strength members simply and reliably using a component made of an alloy exhibiting thermoelastic martensitic transformation as a connector.

Conventionally, this type of connection has been made by butting and resistance welding, but there are concerns about the strength of the welded part, and there is a drawback that it lacks reliability when left outdoors or underwater for a long period of time.

For this reason, various fixing methods using connectors have been devised, but each has its own drawbacks. For example, caulking connections using sleeves, heat-shrinkable plastic pipes, etc., have been considered, but the method of fixing by plastically deforming the sleeve has problems with the sustainability of the fixing force, and when heat-shrinkable plastic pipes are used, Disadvantages include a lack of long-term reliability due to aging caused by deterioration and oxidative deterioration, and the difficulty in expanding tubes to replace narrow bulges with fixing methods that use heat-shrinkable metal sleeves. There were drawbacks that caused limitations. Connectors that use mechanical fixation, such as the tapered fixation method or screw fixation method, have problems with uneven fixation stress and sustainability of fixation force, and are also large in size and require a large space, especially in multi-pair connections. In addition, there are disadvantages that cannot be ignored in practice, such as poor workability in connection and disconnection operations. In order to solve the conventional drawbacks, the present invention inserts at least one cylindrical internal holding fitting into the cylindrical external holding fitting, and also inserts at least one cable tensile strength body at both ends, and inserts one cable tension member in the center. In a subsequent method of a connector configured to sandwich and connect a cable tensile strength member with an external presser fitting and at least one internal presser fitting, the outer presser fitting and the inner presser fitting are both shaped with shape memory. The external presser metal fitting made of the alloy is subjected to tensile processing at a temperature below the martensitic transformation end temperature (Mf), and the internal presser metal fitting is subjected to drawing processing. After forming the connector with an external holding metal fitting made of a metal alloy or an internal holding metal fitting and a cable tensile strength member, the connecting device is heated and maintained at a temperature equal to or higher than the martensitic reverse transformation completion temperature to return to the initial shape and connect. The purpose is to generate uniform caulking stress over a long period of time regardless of the wire diameter, thereby simplifying the subsequent English method and achieving excellent economic efficiency.

The present invention will be explained based on the drawings.

The principle of the present invention will be explained.

The shape memory effect is defined as two temperatures T, T2 and T2>
When there is a relationship T2 ~ T, → T2 → T, when a temperature change is given, ``Even if deformation is applied from the outside at a temperature T2 that is once lower, at a temperature T higher than T2,
This is a phenomenon in which part or all of the deformation disappears and the shape is restored to its original shape. This phenomenon is noticeable in alloys that exhibit thermoelastic martensitic transformation. In other words, the deformation applied at a temperature T2 below the martensitic transformation finish temperature (hereinafter referred to as Mf) is recovered by holding the deformation at a temperature T2 above the martensitic reverse transformation finish temperature (hereinafter referred to as M). This is a phenomenon of returning to the shape. Materials currently known to exhibit shape memory effects include Nj-Ti alloy, Cu-AI-Ni alloy, Cu-Zn alloy, Cu-Zn-Sn alloy, and Cu-Zn alloy. -N alloy ~Cu
-Zn-AIrNi alloy, Cu-Sn alloy, ln-TI
There are alloys such as "Au-Cd alloy" and "Ag-Zn alloy." In the present invention, the Af temperature is 200 oo or less, the Mf temperature is -100 qC or more, and the difference between rainbow and Mf is 30 o.
All of the above-mentioned alloys satisfy this condition.The present invention utilizes the recovery phenomenon of processing deformation as described above, and A restoring force is applied by using force or expansion force alone or in combination, and the result is utilized in the form of caulking stress.

Specific examples will be described below. Alloys that exhibit a shape memory effect (hereinafter referred to as memory alloys).

) For example, a bar material is made of Cu-Zn-AI alloy,
After being heat-treated at a temperature higher than Af, it is cooled to a temperature lower than t temperature Mf and then subjected to a drawing process such as swaging or drawing at that temperature. Returning to the diameter. This can be observed as a noticeable expansion of the diameter. The cylindrical twill material created in this way will be referred to as memory column A. Mandrel drawing under similar thermal conditions. A heat-shrinkable pipe can be created by expanding the inner diameter of a shape memory alloy pipe.

This is called storage cylinder part village B. Next, the cable tensile strength member connecting method of the present invention will be explained.

Figure 2 is a cross-sectional view showing the relative relationship between the external and internal clamps before connection of the cable tension member, Figure 2 is a cross-sectional view after connection, and Figure 3 is a partial cross-section of the connection after connection. A front view shown in FIG.

In Figs. 3 to 3, 2' is an external holding fitting made of ordinary practical metal material and has a cylindrical shape, and 2' is an internal holding fitting made of memory cylindrical member A. (referred to as the cable body). As shown in the diagram, the memory cylinder member A is used as the internal presser fitting 2', and the cable body 3' is inserted from both ends into the external presser fitting car, and the tips thereof are brought into contact at the center of the interior. The sum of the diameter of the internal presser fitting ratio' and the length of the cable body 3 or 3' should be set so that even if the cable body 3 is moved as shown by the imaginary line 3, it will still be smaller than the diameter of the external presser fitting 1 (gap). is indicated by G.) Process the memory cylinder member A. As shown in Figure 1, install the twill connection part, and
' is heated above the temperature Af.

In such a case, the internal presser metal fitting 2' will expand and the internal presser metal fitting 2' will expand.
and the cable body 3 sandwiched between the external holding fitting 1 and
It is possible to obtain sufficient caulking stress for 3′.
The result will be as shown in Figures 3 to 3. Fig. 4 is a cross-sectional view showing the relative relationship between the external and internal presser fittings and the cable body before connection in the second embodiment - Fig. 5 is a cross-sectional view after connection, and Fig. 6 is a front view also partially shown in cross section. Figure ``shows.''

The internal holding fittings 5', 6', and 7' use memory cylindrical parts to hold the cable bodies 8, 8' to be connected to the internal holding fittings 5', 6', and 7'.
The holding member 6' and 7' are sandwiched and placed in an external holding fitting 4' made of a memory cylindrical member B. Thereafter, when heated to a temperature equal to or higher than the temperature Af, the external presser fitting 4' contracts and becomes the external presser fitting 4 of the memory alloy, and the internal presser fitting 5.
', 6', 7r are internal holding fittings 5, 6 made of expanded memory alloy.
, 7, and a caulking stress equal to or greater than that generated when mechanically fixing the internal presser fittings 5, 69 and 7 together with the external presser fitting 4 is generated, as shown in FIGS. 5 and S. Figure 7 is a sectional view showing the relative relationship between the external "internal clamp" and the cable body before connection in the third embodiment, Figure 8 is a sectional view after connection, and Figure 9 is a front view also shown partially in section. The external presser fittings gj and the memory cylindrical member B are used for the internal presser fittings lj, 12, 18, tortoise 8, 15, and tortoise 6', which can be made of ordinary practical metal materials and do not require special materials.

The cable body to be connected is broken.
' is held between the internal presser fittings in the external presser plate g' and pressed against each other. After that, when heated to a temperature higher than Af, the external presser fitting gr contracts and the cable body is threatened.
Between the figure 8 28', 21721', 22, 22' and the internal presser metal fittings turtle 89 11, turtle 2913914, turtle 5, and army 6, a caulking stress equal to or higher than that of mechanical fixation is generated, and the , are connected as shown in FIG. As explained above, according to the connection method of the present invention, the components of the connector that generate medium deformation stress are processed in advance, so they are arranged in a predetermined structure, and then heated. You can easily connect by simply doing the following: If you cool it again to a temperature below temperature Mf, the memory cylindrical member B and memory cylindrical member A will become part of the component of the connector, so the shape before fixing will change. {3} Uniform caulking stress can be generated by using thermal contraction force or expansion force; '4} Conventional screw "taper,
Compared to connection methods that use sleeves, etc., the connection method is extremely simple, allowing for safe connections, miniaturization of multiple-pair connections, and easy connection of cable bodies with a narrow diameter.
■Reliable workability, improved reliability, and excellent economic efficiency.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the relative relationship between the external holding fitting and the internal holding fitting before connection of the cable tensile strength body, Fig. 2 is a sectional view of the same after connection, and Fig. 3 is a partial cross-section of the connection part after connection. The front view shown in Figure 5 is a cross-sectional view showing the relative relationship with the external and internal presser fittings before connection in the second embodiment, and Figure 5 is a cross-sectional view after connection. Fig. 8 is a front view showing a partial cross section of the part;
The figure shows a cross-sectional view after connection.The first figure shows a partially sectional front view of the connected part after connection. 8', turtle 79 87'? 18
, Bao mackerel'9199kan9', 28. 2Q'92 neck, 2sa'9 22,22': Cable body'
Tortoise, 93 External presser fitting made of memory alloy, 4'? 9
External presser fitting consisting of a memory cylindrical member "5, 6, 3
: Internal presser metal fitting made of memory alloy, internal presser metal fitting made of 5', 6' cylindrical parts, 16,16: Internal presser metal fitting. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. Insert at least one cylindrical internal holding fitting into the cylindrical external holding fitting, and insert at least one cable tensioning member from each end, and butt the cable tensioning member in the center with the external holding fitting. In a method of connecting a connector configured to be connected by clamping with at least one internal holding fitting, at least one of the external holding fitting and the internal holding fitting is made of an alloy having a shape memory effect, and External and internal presser fittings are tensile processed at a temperature below the martensitic transformation end temperature (Mf), and the internal presser metal fittings are subjected to drawing processing, and the external presser metal fittings are made of an alloy subjected to the processing, or A method for connecting a cable tensile strength body, in which the connector is configured with an internal holding fitting and a cable tensile strength body, and then heated and held at a temperature higher than the martensitic reverse transformation end temperature to return to the initial shape and connect.