The inductor for magnetic pulse processing

 

(57) Abstract:

The invention relates to the field of metal forming and can be used in sheet metal forming operations when the magnetic pulse forming flat parts. The inductor includes a flat conductor coil with a gap between the coils and the hole formed by the Central coil. The coils forming the Central zone has a height exceeding the height of the remaining coils. They form a protruding portion of the spiral from the side of the outside edge of the inductor. In the inductor has two closed loop of electrically conductive material and one closed loop of electrically conductive material with a high conductivity, the axis of which is offset from the axis of the inductor. One of the two mentioned short-circuited coils covers the protruding portion of the turns of the Central zone of the spiral, and the second of its peripheral level. On the inductor side of the formed parts installed cover of a nonmagnetic material with holes located in the area of the closed loop. Last mounted on the lid between the inductor and workpiece. The result is the expansion of the functionality of the inductor and increasing its mechanicalthe in sheet metal forming operations when the magnetic pulse forming flat parts.

A device for electromagnetic correct dents in conductive materials (patent USSR N 728695, CL 21 D 26/14, 1980) containing supplied to the dent of the working cylinder with the coil inductance, the first source for supplying the working head slowly increasing voltage, the second source to feed her fast-rising current of lesser amplitude and opposite polarity, and the control system serial supply current.

Also known cylindrical inductor for magnetic pulse processing sheet parts (patent USSR N 772470, class B 21 D 26/14, 1980), having end working surface and formed of a cylindrical conductive spiral with turn-to-turn insulation.

The disadvantage of this device is the design complexity.

In addition, the known inductor for magnetic treatment items (USSR author's certificate N 969373, class B 21 D 26/14, 1982), made in the form of a flat spiral of electrically conductive strips, large side which is perpendicular to the plane of the spiral, and the spiral coils are arranged with a gap from each other.

Closest to the proposed invention the technical essence is the inductor for magnetoimpuls is authorized by the Central coil (USSR author's certificate N 405630, B 21 D 26/14, 1974).

However, in a known inducer a problem occurs with the formation of parts from materials with low electrical conductivity. This increases the complexity of the formation of the items.

In addition, the inductor has insufficient mechanical strength.

The task, which is aimed by the invention, is to expand the functionality of the inductor due to the increase of magnetic effects in the treatment area and increase its mechanical strength due to the hanging of the magnetic induction in the Central zone.

Left the task is achieved by the fact that the inductor for magnetic pulse processing, containing a flat conductor coil with a gap between the coils and the hole formed by the Central coil, fitted with two short-circuited turns of electrically conductive material, a cap of non-magnetic material mounted on the inductor side of the formed part and is made with holes and secured to the cover between the inductor and forming part third closed loop of electrically conductive material with a high conductivity, the axis of which is offset from the axis of the inductor, thus, turns centrala part of the spiral, located from the side of the outside end of the inductor, one of the two mentioned short-circuited coils covers the protruding portion of the turns of the Central zone of the spiral, the second of its peripheral coil and cap holes are located in the area of the third closed loop.

The essence of the inductor is illustrated by a drawing. In Fig. 1, the inductor shown in section, Fig. 2 is a view of the inductor from the bottom.

Conductive helix with six coils 1-6 and clearances 7 - 11 between them has outputs 12 and the Central hole 13. Protruding coils 1 and 2, forming the Central hole 13, comprises a closed loop 14. End of the outer coil 6 comprises a closed loop 15. All the device is in the brace 16. To the bottom of the coil cover 17 of non-magnetic material, onto which the sleeve 18, which is the third closed loop 19 of electrically conductive material with a high conductivity, the fastening of the third closed loop is anti-squeak plate 20. Item 21 is placed with a gap 22 relative to the pressure plate 20.

The inductor operates as follows.

Through the coils 1-6 conductive spiral skipped the pulse current of the dummy parts 21 and in the third closed loop 19. The interaction of pulsed magnetic fields in spiral with a third closed loop 19 and the parts 21 leads to the formation of the latter. At the same time, a pulse magnetic field of the helix induces eddy currents in the shorted coils 14 and 15, and the resulting magnetic field is short-circuited turns, interacting with the pitch of the helix causes the area nepostanovku the formed part, the phenomenon compressive loads acting in the direction of the Central hole 13, which leads to compaction of the coils of the helix, and ultimately to increase the resistance of the inductor.

As a result of increase of the magnetic induction in the Central area on the working surface of the inductor is reduced zone nepostanovku in formed parts.

The inductor for magnetic pulse processing, containing a flat conductor coil with a gap between the coils and the hole formed by the Central coil, characterized in that it has two short-circuited turns of electrically conductive material, a cap of non-magnetic material mounted on the inductor side of the formed part and is made with holes and secured to the cover between the inductor and forming part third cage Vitko the ri this turns the Central zone of the conductive spiral is made high, exceeding the height of the other coils, with the formation of the protruding part of the helix that is located from the side of the outside end of the inductor, one of the two mentioned short-circuited coils covers the protruding portion of the turns of the Central zone of the spiral, the second of its peripheral coil and cap holes are located in the area of the third closed loop.

 

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