Method and device for manufacturing magnetic flux catching and compressing shell

FIELD: electrical engineering; generation of extremely intensive magnetic fields by magnetic cumulation method.

SUBSTANCE: proposed method designed for manufacturing cylindrical shell with conductors disposed along generating line includes placement of insulated conductors on main cylindrical mandrel, its potting in curing compound, and post-curing mechanical treatment of shell. Insulated conductors are wound on additional T-shaped mandrel that has cylindrical part and base perpendicular to its axis; base carries longitudinal cleats with slits on its opposite ends for winding two conductor coils at a time. Coils are placed upon trimming on main cylindrical mandrel so that conductors are arranged along generating line of mandrel, this procedure being followed by removing fixation clamps from parts.

EFFECT: enlarged functional capabilities.

2 cl, 6 dwg

 

The invention relates to electrical engineering, to techniques for the production of super-strong magnetic fields by the method of magnetic concentration, and particularly to a technology of manufacturing a shell for capture and compression of the magnetic flux, which is the element of the magnetic flux compression generator (ICG) [A.D. Sakharov and others, Magnetic cumulation. DAN SSSR, 165, No. 1, p.65, 1965].

The known method and device for the manufacture of shell magnetic flux compression generator, in which, for increasing the magnetic field and its cylindrical shell made of glued together insulated copper conductors along the forming cylinder [I.E. Bells, etc. A.S. No. 311582, CL N 05 N 7/04, publ. in BI No. 32, 1979]. In the initial state, the membrane material due to the lack of conductivity in the azimuthal direction freely passes the axial magnetic flux in the cavity of the shell, and compression under the action of the explosion of conductors is closed sheath material becomes metallic conductivity, the shell captures and compresses the magnetic flux, increasing the initial magnetic field. For efficient operation MCG (to maintain a high degree of symmetry of the collapse of the shell to the center) it is necessary that the conductors evenly and tightly fills the cross section of the shell, so the shell with a diameter of several centimeters consists of many hundreds of about the of Umnikov. The manufacture of such membranes presents certain difficulties.

To increase the maximum magnetic field ΜG need to increase the energy shell, compressing the magnetic flux, i.e. the kinetic energy and the density of the kinetic energy in the shell [A.I. Bulls and other A.S. No. 2065247, CL N 02 N 11/00, publ. in BI No. 22, 1996]. The method includes creating a cylindrical shell made of composite material - a mixture of powders heavy compared to copper metal and dielectric in a known manner molding or fill in the form. The mixing ratio is chosen in such a way that in the initial state, the conductivity of the composite was small, and compression of the material under the action of the shock wave of the explosive charge ΜG grows to values that allow the shell to capture and the subsequent collapse to the center compress the magnetic field inside the shell.

The disadvantage shell made in this way are found experimentally [V.V. Aseeva and others, Investigation of Conducting Properties of MC-1 Generator Cascades Material from Powder Composite. In: Program of the VIIIthInternational Conference on Megagauss Magnetic Field Generation and Related Topics, October 18-23, 1998, Tallahassee, USA, WE-04, p. 156] insufficient capture and compression of magnetic flux shell of large size. The specific density of the powder composite material (determined mainly by the number of metal components) in the similar condition is limited by the size above: excess metal increases the initial conductivity of the composite to the values preventing diffusion of the initial field in the cavity. And so much easier dielectric component occupies a large volume and to achieve high conductivity of the composite by compression of the magnetic field (for convergence metal particles before contact), you need a three-dimensional compression of the material of the shock wave, which is impossible for large radii of the shell (when compression is done only in the radial direction). Not high enough conductivity of the compressed composite shells of large diameter leads to large losses of magnetic flux at the initial stage of operation of UG. These losses could be avoided by making the sheath of the insulated conductors of heavy metal, for example tungsten. In this case, the circuit conductors would be enough even slight compression of the shell. However, the manufacture of membrane materials with high stiffness and spring characteristics, which has tungsten, also represents a significant challenge.

Closest to the claimed is a method of manufacturing a cylindrical shell for capture and compression of magnetic flux and device for its implementation A.S. No. 683510, CL N 02 N 11/00, publ. in BI No. 30, 1980, the Way the prototype is that on the main cylindrical mandrel stack insulated conductors, the dal is poured curable compound, then after it cured, mechanically treated shell. The resulting membrane is a multilayer coil of insulated copper conductor type sew-2 with a diameter of 0.12-0.3 mm On the main cylindrical mandrel of appropriate diameter of this conduit is placed a few turns with a pitch of the order of or larger than the diameter of the mandrel. Next to this guide closely to the right and to the left lay the following guides and so on the conductor to the conductor until the entire pot is covered with a layer of conductors, and then wrap the second layer, the conductors which are placed in the gaps between the conductors of the first layer. Inductance thus obtained coil is determined by the diameter and length of the mandrel and the number of turns, and the weight of the coil - number of layers. After winding the required number of layers of the working length of the coil is wound with several layers of fiberglass and impregnated under vacuum with a compound based on epoxy resin. Then the coil is cut under the internal diameter of the ring of explosives, is removed from the mandrel, the conductors on both ends are stripped and soldered to the leads. Made so shell-coil performs in ΜG source in the primary magnetic flux and shell, exciting and gripping the initial magnetic flux.

The disadvantage of the prototype is the impossibility of making a shell of rigid conductors, such as tungsten, with an arrangement of conductors along the axis of the cylinder, which is necessary in cases when it is necessary to separate the functions of the coil and the sheath. Made of spiral-wound membrane absorbs some of the energy of the initial magnetic field created in this case by another source, working as a secondary winding of the transformer: part of the induced magnetic flux is not directed along the axis and is not compressed in the subsequent collapse of the shell.

This invention solved the problem of separating the functions of the creation and initial compression of the magnetic flux of the coil and shell and achieved the ability to manufacture cylinders of the required size and quality (homogeneity) from conductors of any hardness and from various materials.

The technical result for the solution of this task is to provide a method and an apparatus for manufacturing a cylindrical shell of oriented along the axis of conductors with required properties, in particular one of the conductors with the high specific density of a substance, such as tungsten, allowing to increase the capture efficiency of the magnetic flux and to increase the kinetic energy of the shell, which allows to increase the maximum value of the magnetic field m is griekwastad generator.

This technical result is achieved by the fact that in comparison with the known method of manufacturing a cylindrical shell for capture and compression of magnetic flux, including the laying of isolated conductors on the main cylindrical mandrel, fill-curable compound and machining membrane after curing, it is new that before laying produce a winding of insulated conductors on additional T-shaped mandrel, two sections simultaneously with the fastening sections hooks, and flat springs along the length equal to the length of the shell, and the laying of the sections after the crop on the main cylindrical mandrel so that the conductors were located along the generatrix of the mandrel with the subsequent release of from fixing brackets, parts and springs.

This technical result is achieved by the fact that in comparison with the known device for the manufacture of membranes for the capture and compression of magnetic flux that contains the main cylindrical mandrel for laying insulated conductors, it is new that it contains additional T-shaped mandrel that is installed with the possibility of rotation, comprising a cylindrical portion and perpendicular to its axis, a base attached to the opposite sides of the longitudinal slats with about what iesi for winding two sections of conductors simultaneously.

Shell MCG, compressing the magnetic flux must be “transparent” to flow initial axial magnetic field created by an external source, then there should be no conductivity in the radial (cross-axis) direction, and in the capture and subsequent compression of the magnetic flux it must be close to metallic conductivity in the same direction. Therefore, forming the sheath conductors must in the initial condition be placed along generating lines of the cylinder (along the axis). If the conductors are laid in a spiral, while the diffusion flow of the initial magnetic field inside the shell at the ends of the conductors (the ends of the sheath) voltage occurs, leading to premature breakdown and, therefore, loss of the initial magnetic flux. For effective compression of the magnetic flux required high conductivity of the membrane material under compression, which is achieved by a dense packing of conductors in the shell, and to increase the maximum value of enhanced magnetic field in the magnetic flux compression generator it is necessary to increase the kinetic energy of the shell, i.e. run it from conductors with a large specific gravity of a substance, such as tungsten. However, the conductors are made of tungsten have high rigidity and spring characteristics that is not possible to make a shell known what means.

The inventive method and device for manufacturing a shell of conductors arranged parallel to the axis of the mandrel consists of two stages:

1. Winding the required number of identical sections for additional T-shaped mandrel with fixation forms each of them a special device (brackets and straps).

2. Laying sections together with the fixtures on the main cylindrical mandrel, the outer diameter of which is equal to the inner diameter of the shell, and deleting devices with simultaneous fixing of conductors in the form of a cylinder thread is wound on the outer surface.

I made so shell forming its conductors stacked tightly in several layers so that the conductors now lie along the forming mandrel. The multi-layer membrane is required to maintain cylindrical symmetry of the compression - in this case, the shell thickness of the stacked multiple conductors and the conductors of one layer are placed in the gaps between the conductors of adjacent layers. The compression efficiency of the stream is reached by a dense arrangement of the conductors, when a small radial displacement of the conductors with the passage of the shock wave destroys their isolation and closes the conductors.

Figure 1 shows additional T-shaped mandrel for the manufacture of sections of the glasses to the winding conductors.

Figure 2 shows additional T-shaped mandrel for the manufacture of sections of the shell after winding conductors and installation of devices for fixing the shape of the sections.

Figure 3 shows the main cylindrical mandrel for the manufacture of the membrane with the attached sections and locking devices.

Figure 4 shows the main mandrel for the manufacture of shell sections and locking devices, end view along arrow A.

Figure 5 shows the main mandrel for the manufacture of shell in the process of fixing the conductors thread and exemption from bars and brackets.

Figure 6 shows a section b-B of the main frame with the shell and covering her collar.

POS. 1 - sheath;

2 - conductors sheath;

3 - the main cylindrical mandrel;

4, 5 - additional T-shaped mandrel;

4 is a cylindrical portion of the mandrel;

5 - the basis of the additional mandrel;

6 - section sheath;

7 - fixing bracket;

8, 9, 10 - fixing parts;

11 is a flat spring;

12 is a longitudinal strips;

13 is a longitudinal slits in the longitudinal strap;

14 - the screws for fastening the longitudinal bars to the base;

15 - grooves for installations fixing brackets 7;

16 - grooves for the passage of the cropping tool;

17, 18 limiting the displacement of the cropping tool is a;

19 is a flexible strip with holes;

20 - the screws for fastening the unit to the flexible strips;

21 - split clamp;

22, 23 - part clamp;

24 - thread;

25 is a protective layer on the main frame.

The method of manufacture of the shell 1 for capture and compression of magnetic flux includes laying the insulated conductors 2 on the main cylindrical mandrel 3, the fill-curable compound and machining of the shell 1 after curing. Before laying produce a winding of insulated conductors 2 additional T-shaped mandrel 4, 5, two sections 6 simultaneously with the fastening sections 6 retaining clips 7, 8, 9, 10, and a flat spring 11 by a length equal to the length of the shell 1. Section 6 after cutting the stack on the main cylindrical mandrel 3 so that the conductors 2 was located along the generatrix of the mandrel 3 with a subsequent release from the locking brackets 7, parts 8, 9, 10, and flat springs 11.

Device for the manufacture of the shell 1 for capture and compression of magnetic flux includes a main cylindrical mandrel 3 for laying of insulated conductors 2 and additional T-shaped mandrel 4, 5, installed with the possibility of its rotation. T-shaped additional mandrel consists of a cylindrical part 4 and perpendicular to the axis of the base 5. On opposite sides founded the I 5 screws 14 are attached to the longitudinal strap 12 with a longitudinal slot 13 for winding the two sections 6 conductors 2 at the same time. In the manufacture of the sections are also fixing bracket 7, the fixing parts 8, 9, 10 (5 pieces on each side: two parts 8 and 9 and one part 10) and the flat spring 11. In the base 5 near its ends with two sides made grooves 16 for the passage of the cropping tool. On both sides of the grooves 16 are fastened with screws stops 17 and 18 offset cutting tool (an abrasive disc cutter or saw). In the flexible strips 19 with holes for screws to 20 in increments defined by the number of sections.

In the example of implementation of the proposed method and device shell for capture and compression of magnetic flux is produced in the following way. On the basis of 5 additional T-shaped mandrel in the middle there is a cylindrical portion 4 for securing the mandrel in the spindle winding machine and there is a small bulge in the middle part. On both sides of the base 5 by screws 14 are fixed longitudinal strap 12 with the slots 13. The cross-sectional shape of the slots 13 is similar to the cross-sectional shape of a sector of a cylinder or simplified, for example rectangular, with area equal to the cross-sectional area of the section. Along the slot 9 is made of several transverse grooves 15 a depth equal to the thickness of the fixing brackets 7, installed in the slots 15 before winding. At the edges of the mandrel is made grooves 16 for passage of a PR tool is cutting unnecessary bent portions of the wire winding.

After installing the brackets 7 in the grooves 15 in the slots 13 is wound, the required number of turns of wire, place the fixing parts 8, 9 and 10 fit in longitudinal grooves of these details is placed uniting them flat spring 11, and the ends of the brackets 7 are connected and bent, holding the wires to the fixture details fixture. Then the edges of the slots 16 are mounted stops 17 and 18 and an abrasive disk, a disk cutter or a saw guides pererezaetsya between the stops 17 and 18. After removal of the T-shaped frame limiter 17 and 18 cut the wires, together with the parts 8, 9, 10 and spring 11, to which the conductors are clamped by the clamps 7, form a single section 6.

In the spring 11 has two smooth, and under them in detail 9 two threaded holes. Of the required number - nine - sections 6, two flexible strips 19, in which the drilled hole with a step defined by the number of elements, and screws 20 to the main cylindrical mandrel 3 mounted for rotation and having a protective layer 25, thus preventing the bonding wires of the shell to the mandrel further filling, going to a “canvas” of conductors (see figure 3 and 4), fitting the mandrel 3. The ends of the sections are pressed against the main frame 3 split clamps 21. Then the mandrel 3 with sections 6 is mounted on a turning or winding machine (see figure 5 and 6), remove the wasps 19, move in the direction along the groove of the spring 11, freed from the springs 11 plot raskrepljajut and remove the bracket 7 and part 9 of the device, resulting in this area are exempt conductors of the sections of the shell. The edges of the liberated area set the clamps 22 and 23, the conductors is flattened and pressed against the mandrel. The clamp 22 is fixed nylon thread 24 include rotation of the mandrel and wrapped the guides thread. The closer the threads of the clamp 23 of his push, push is also the springs 11, sequentially rassadina and remove the bracket 7, part 10, 9, 8, winding of vacant plots shell thread up to the edge of the shell, where also removed the clamps 21 and 23. The end of the thread is fixed. Then go back to the beginning of the winding thread, again fix the end of the new thread, remove the remaining parts 8 and the clamp 21 and wrapped exempt section of the shell thread by attaching its end.

The mandrel is wrapped with thread sheathed conductors are placed in a casting form, fill it curable compound, filling the interstices between the wires and bonding them together. After hardening of the composition, the form is removed, is machining the outer surface and ends of the casing, the mandrel is removed and the protective layer. Cylindrical shell laid closely and focuses the s parallel conductors forming finish. Under the proposed method were made of a cylindrical shell with an inner diameter of 28 mm, a wall thickness of 3.5 mm and a length of 320 mm One shell made of ~5000 copper conductors of insulated wire type PETV-2 with a diameter of 0.25 mm, the second of 4590 hard tungsten wires with a diameter of 0.008 inch with formarum insulating coating (California Fine Wire Co.). The shell is mounted on the axis ÁG type cascade generator MK-1 [A.I. Bykov et al., The cascade magnetocumulative generator of ultrahigh magnetic fields - A reliable tool for megagauss physics. Physica B 216, p. 215-217, 1996], which is created and compressed magnetic flux and which is used to study the properties of matter in superstrong magnetic fields. Experiments with generators MK-1 with internal cascades-shells, made by the present method and the device showed that, compared with the prototype they managed to get rid of the loss of flow during its diffusion into the cavity of the shell before the inclusion membrane in a process stream compression, to increase the efficiency of the capture and compression of magnetic flux and, in aggregate, increase the final magnetic field generator MK-1. The inventive method and device for the manufacture of shells ΜG technological and ensures the manufacture of shells high quality of the conductors with any mechanical properties.

1. A method of manufacturing oblock is to capture and compression of magnetic flux, including laying of isolated conductors on the main cylindrical mandrel, fill-curable compound and machining membrane after curing, characterized in that before laying produce a winding of insulated conductors on additional T-shaped mandrel into two sections simultaneously with the fastening sections hooks, and flat springs along the length equal to the length of the shell, and the laying of the sections after the crop on the main cylindrical mandrel so that the conductors were located along the generatrix of the mandrel, with the subsequent release from the locking brackets, parts and springs.

2. Device for the manufacture of shell capture and compression of magnetic flux that contains the main cylindrical mandrel for laying insulated conductors, characterized in that it contains additional T-shaped mandrel that is installed with the possibility of rotation, comprising a cylindrical portion and perpendicular to its axis, a base attached to the opposite sides of the longitudinal straps with slots for winding two sections of conductors simultaneously.



 

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