Method for composite wire manufacture

FIELD: electrical engineering; devices designed for operation at liquid helium temperature.

SUBSTANCE: proposed method for manufacturing composite wire includes production of primary composite billet incorporating external sheath and axial cylindrical block, sealing of primary composite billet, reduction, and extrusion, followed by deformation to obtain rod of desired shape and size, its cutting into measured lengths, formation of secondary composite billet by assembling rod in external sheath, sealing of secondary composite billet, reduction, and extrusion, followed by deformation to final size of wire; composite billet reduction involves its pre-extrusion press-fitting in container; total cross-sectional area of composite billet components is 95-99% of that of inner space of container sleeve and inlet part of composite billet external sheath is made in the form of transition zone having cylindrical part whose outer diameter is smaller than that of container sleeve and conical part, volume of voids within composite billet amounting to 1-17% of that of external sheath inner space.

EFFECT: provision for pre-extrusion hot compression of composite billet without additional time requirement.

6 cl, 2 dwg

 

The invention relates to the field of electrical engineering and can be used in devices designed for operation at temperatures of liquid helium.

A known method of manufacturing a composite wire comprising forming a primary composite billet, containing an outer casing and an axial cylindrical block of plastic materials, sealing and evacuation of the primary composite billet, extrusion and subsequent deformation to obtain a rod of a given shape and size, cutting the rod to length, the formation of secondary composite billet by assembling the cut bars in the outer shell of plastic material, the sealing and evacuation of the secondary composite billet, extrusion and subsequent deformation to the final wire size, and the extrusion of composite workpieces carried out without prior compression blanks /1/.

In this way receive a bi-metal or tri-metal wire, and multi-fiber wire with a small number of fibers (usually not more than 200-300). To obtain a larger number of fibers in the composite wire operation the Assembly of the composite billet is repeated the necessary number of times. However, increasing the number of Assembly operations and, accordingly, the number of extrusions composite blanks when s is vesennih temperatures leads to a noticeable decrease in the operational characteristics of the wire, and output in valid.

Increasing the number of rods in one composite blank is associated with a decrease in their size and, as a consequence, an increase in the complexity of their formation into a single beam and, as a rule, with increasing number of voids. Voids are present within the case and between the composite billet and the inner surface of the sleeve of the container, in which she is placed. The initial stage of deformation by the pressing - repressive, in which in the direction of least resistance workpiece under the influence of force of the punch is widened and is precipitated. When the ratio of the lengths and cross-sections of individual rod, considerably higher than the optimal, in the absence of reliable contact elements between themselves and the contact elements of the case, the deformation is almost similar buckling, resulting in a loss of the plastic resistance to deformation in the matrix of the container. This tendency increases with decreasing transverse size of the last.

A known method of manufacturing a composite wire, selected as a prototype /2/, including the formation of the primary composite billet, containing an outer casing and an axial cylindrical block of plastic materials, sealing and evacuation of the primary composite workpiece is compressed is e, the extrusion and subsequent deformation to obtain a rod of a given shape and size, the cutting rod measuring part, the formation of secondary composite billet by assembling the cut bars in the outer shell of plastic material, the sealing and evacuation of the secondary composite billet, compression, extrusion and subsequent deformation to the final wire size, and the composite extrusion billet is carried out after preliminary hot isostatic compression blanks.

Set out the method of manufacture allows to obtain high-quality composite wires with fiber count of 1000 and above, and the limit can only serve as the possibility of assembling such a large number of rods of small cross-section. The meaning of the operation is to eliminate voids that occur during Assembly of the composite billet. Elimination of voids in the pre-vacuumed the workpieces is achieved by flow of the material of the shell in terms of all-round compression in the radial direction. It is necessary, in order for the shell, for example, of copper or of an alloy based on copper did not cause deformation of the valve, for example, of niobium-titanium alloy or niobium. Last may, when the deformation resistance of the material of the shell is much less than the resistance to deformation of niobium-titanium or Nabieva the rods in the longitudinal with respect to the axis of the workpiece, and transverse directions.

However, the maximum ratio of bounds turnover of niobium-titanium alloy or niobium with respect to copper or an alloy based on copper can be obtained with increasing temperature. The optimum temperature compression is in the temperature range from 550 to 650°C. Taking into account the inertia of the heating of the composite billet and stretched in the time course of the membrane material, the residence time of the composite workpiece at elevated temperatures can reach several hours. In these conditions, despite the presence of niobium diffusion barrier, for superconductors based on niobium-titanium alloy increases the diffusive interaction between copper and alloy, as for the wires, based on the connection type A15 conditions premature formation of brittle compounds Nb3Sn, which greatly degrades the ductility of the composite material and the quality of the composite wire.

Another disadvantage of this method of manufacture of composite conductors is the possibility of obtaining the crown of the shell extruded rod. The process of extrusion of composite workpieces as described above is constructed so that the cross-sectional sizes objetos billet suggest it in the container of a press with a certain gap, th is leads to the displacement of the centre of the latter with respect to the container of the press, and cooled shell in contact with the pressure leads to uneven repressive.

The technical problem of the present invention is to provide a hot-seal composite billet before extrusion, not associated with additional heating time.

The problem is solved so that if in the known method of manufacturing a composite wire comprising forming a primary composite billet, containing an outer casing and an axial cylindrical block of plastic materials, sealing and evacuation of the primary composite billet, compression, extrusion and subsequent deformation to obtain a rod of a given shape and size, cutting the rod to length, the formation of secondary composite billet by assembling the cut bars in the outer shell of plastic material, the sealing and evacuation of the secondary composite billet, compression, extrusion and subsequent deformation to the final wire size, the composite extrusion billet is carried out after preliminary hot isostatic compression blanks, in the proposed method, the compression of the composite billet is carried out by pressing in the container before extrusion, the total area of the elements of the composite billet in its cross-section is 95-99% of the cross-sectional area of the internal space of the sleeve of the container, and the lead-in portion of the outer shell of the composite billet is made in the form of a transition zone consisting of a cylindrical part with an outer diameter less than the inner diameter of the sleeve of the container, and a tapered part, and the volume of voids within the composite billet is 1-17% of the volume of the internal space of the outer shell.

In the particular case of implementation of the invention, the material of the outer shell of the composite billet copper is used as an axial cylindrical block NbTi alloy.

In another particular case, the implementation of the invention, the material of the outer shell of the composite workpiece using an alloy based on copper, as well as axial cylindrical block NbTi alloy.

In another particular case, the implementation of the invention, the material of the outer shell of the composite billet copper is used as an axial cylindrical block niobium.

In another particular case, the implementation of the invention, the material of the outer shell of the composite workpiece using an alloy based on copper, as well as axial cylindrical block niobium.

In another particular case of the invention between the material of the outer shell of the composite workpiece and axial cylindrical block is placed the sleeve of niobium.

The proposed scheme of composite compression is workpieces includes the following sequence of operations: loading into the furnace and heating the composite preform, the discharge from the furnace and transported to the press, compression by pressing in the container, squeezing. The heated billet is a cross-sectional sizes larger than the internal cross-section of the sleeve of the container presses on the size of the voids formed by the Assembly of the composite. The outer diameter is calculated so that the cross-section of the composite billet ranged from 95 to 99% of the cross section of the container. The lower limit of harvest determines the steady process of repressive and pressing without buckling of bars. The upper limit of the volume of the workpiece determines the radial deformation of the membrane in the absence of longitudinal and guarantees from the overflow container.

The original volume of voids within the composite billet is 1-17% of the volume of the internal space of the outer shell. The lower limit defines no need for the compression of the workpiece, and the upper limit defines the uniform compression of all components of the workpiece.

For a uniform space in the container, press the starting end of the composite billet perform in combination, a cylindrical part with an outer diameter less than the inner diameter of the sleeve of the container, and a conical portion, the height of which may vary from 10 to 70 mm, depending on the design of the workpiece. The height of the cylindrical h the STI is determined by the structure of the press. So, for horizontal presses it is minimal and is the height of the cover, and vertical presses in the case of large workpieces for reliable alignment it is a significant part, but the volume of this cylindrical part does not exceed the cut part of the front end of the extruded rod.

Examples of specific performance

Figure 1 shows the cross-section of the tri-metal workpiece and a fragment of a longitudinal section of the outer shell. The Assembly of the composite billet is made by placing in the outer copper shell (1) rod of NbTi alloy (2) and intermediate niobium diffusion barrier (3). The outer part of the lead-in end of the outer shell is made as a combination of a cylindrical (4) and cone (5) parts. The cross-sectional area of the original elements of the composite billet is 98,4% of the cross-sectional area of the internal space of the sleeve container (diameter 95,0 mm). The volume of void space inside the case (outer shell) after placing the core and the barrier was 2.8%.

Figure 2 presents the cross-section of a multi-fiber preform and a fragment of a longitudinal section of the outer shell. The Assembly of the composite billet from 2346 fibers (6) with a Central copper core (7) arranged in the casing (8), the outer part of the lead-in end of which is implemented as combined the purpose of a cylindrical (9) and cone (10) parts. The composite billet is intended for on the vertical extrusion press container with a diameter of 130 mm, therefore, to commit a large part inside the sleeve of the container cylindrical part is made elongated. The cross-sectional area of the original elements of the composite billet is 97.5% of the cross-sectional area of the internal space of the sleeve of the container. The volume of void space inside the case (outer shell) after placing all of the structural elements was 12.0%.

The technical result of the proposed method of manufacture of composite wires is to improve their quality.

Sources of information

1. "Physical metallurgy and technology of superconducting materials". Under the editorship of Fonera S., Schwartz B., USA, 1981; TRANS. from English. M.: metallurgy, 1987, str-254, page 317.

2. John D.Scudlere and Michael F.Murphy. SSC superconductor fabrication, Wire Journal International, Vol.25, No.1, 1992, pp 71-72.

1. A method of manufacturing a composite wire comprising forming a primary composite billet, containing an outer casing and an axial cylindrical block, sealing the primary composite billet, compression, extrusion and subsequent deformation to obtain a rod of a given shape and size, cutting the rod to length, the formation of secondary composite billet by assembling the cut bars in the outer shell, Hermetica the Oia secondary composite billet, compression, extrusion and subsequent deformation to the final wire size, characterized in that the compression of the composite billet is carried out by pressing in the container before extrusion, the total area of the elements of the composite billet in its cross-section is 95-99% of the cross-sectional area of the internal space of the sleeve of the container, and the lead-in portion of the outer shell of the composite billet is made in the form of a transition zone consisting of a cylindrical part with an outer diameter less than the inner diameter of the sleeve of the container, and a tapered part, and the volume of voids within the composite billet is 1-17% of the volume of the internal space of the outer shell.

2. The method according to claim 1, characterized in that the material of the outer shell of the composite billet copper is used as an axial cylindrical block NbTi alloy.

3. The method according to claim 1, characterized in that the material of the outer shell of the composite workpiece using an alloy based on copper, as well as axial cylindrical block NbTi alloy.

4. The method according to claim 1, characterized in that the material of the outer shell of the composite billet copper is used as an axial cylindrical block niobium.

5. The method according to claim 1, characterized in that the quality of material outside of what rocki composite billet is used alloys based on copper, and as axial cylindrical block niobium.

6. The method according to any of claim 2 and 3, characterized in that between the material of the outer shell of the composite workpiece and axial cylindrical block is placed the sleeve of niobium.



 

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