SU54496A1 - Seismograph - Google Patents

Description

When quenching with high-frequency currents, as is known, it can be applied both to simultaneously heat the entire surface to be quenched at once, and to successively heat the surface to be quenched, moving it after heating to the zone where the heated parts are cooled.

In the latter method, a great disadvantage is the very unfavorable working conditions of the tempering coil, which will be very small in the direction perpendicular to the direction of the current. This circumstance causes an unfavorable current distribution in this coil, a poor electrical efficiency, and an unfavorable power factor of the coil. These circumstances require the use of high frequencies and increase the cost of quenching.

The object of the present invention is a device for hardening products, which aims at making it possible to operate at relatively low frequencies, reaching up to 50 Hertz, to increase the efficiency and cos-f of the quenching device, and also to achieve the hardening of only certain zones, without entering the .kra x and at the end of the quenched object.

Like the known induction heating devices used for quenching, the proposed device is made in the form of a coil with a core of a material of high magnetic permeability to reduce magnetic resistance.

In this case, according to the invention, in order to achieve this goal, each coil wire is surrounded by an independent conductor open on the side of the hardened surface. The wire can be equipped with such a magnetic circuit either along the entire length or on a part of its length. The latter design aims at concentrating the magnetic flux on a portion of the length of the wire.

The invention is illustrated in the drawing; in FIG. 1 and 2 of which is shown in two projections a part of one coil wire surrounded by an independent magnetic core; in FIG. 3 - a section of one wire, made in the form of a coil and surrounded by a magnetic core.

In the drawing there are the following designations: / - wire (part of a loop or zigzag), through which a high-frequency current flows, quenching, a 2-magnetic core made of laminated iron or powder iron, which reduces the magnetic resistance for magnetic flux inducing currents in article 3 subject to quenching, 5-gap between the iron and the hardened product.

Since part of the loop can induce currents in iron 2, a massive copper screen 4 is located in a plane parallel to the separation of iron 2, which, if necessary, can be cooled with water.

The use of a magnetic conductor for each coil wire reduces the magnetic resistance of the system consisting of this passage and the hardened product. Consequently, the thermal effect created by the proposed device can be obtained either at a significantly lower amperage than in known quenching devices, or at a significantly lower current frequency.

Using the proposed device, one can harden rails, plates, cylindrical products, etc. Continuous hardening can be accomplished by moving the product or device one relative to another. Local hardening is achieved by surrounding one of the wires of a loop or part of a turn with iron in the absence of the latter of the other wires or part of a turn.

The subject matter of the invention.

Claims (2)

1. A device for surface hardening of products by an induction method, made in the form of a coil with a core of material of great magnetic permeability to reduce magnetic resistance, characterized in that each wire of the coil is surrounded by a separate magnetic core, open from the side of the hardened surface. 2. The form of the device according to claim 1, characterized in that the wire is provided with a magnetic conductor only on the part of the coil, Well to the author's certificate of V.P. Vologdin and A.A. Vogel № 54496 FIG. one FIG. 2 LJ, /////////// //// and about F & G. S .  .