SU907879A1 - Inductor for heating - Google Patents

Description

(54) HEATED INDUCTOR

one

The invention relates to mechanical engineering, in particular to the automotive industry and can be used to heat billets in forging.

Multi-turn inductors of the type through passage are known, in which the active turns of the inductor are arranged in concentric circles with different radii.

In this case, with the location of the workpieces on the turntable flanges in the opposite direction from the centers along the radii of the table is possible tight packing of the workpiece. For example, the ends of the semi-axes that need to be heated for a subsequent landing may be spaced from each other at a distance of 1.1-1.5 rod diameter.

As a result of this arrangement of the heated billets, the inductor becomes compact and economical (with high efficiency) l.

A disadvantage of this device is that due to the different concentration of magnetic fluxes in the turns of the inductor, the conductors of which are located along concentric circles of the greatest and the smallest radius, different heating intensity takes place. The ends of the billet are heated in a coil located along a concentric circle with a small radius, are heated faster and to higher temperatures than other parts of the billet and this degrades the quality of heat treatment.

IS

Claims (2)

The closest to the present invention is an inductor for heating, made in the form of a multi-turn coil with arcuately curved windings set in concentric circles, the width of each turn decreases in the direction of increasing the diameter of these circles. 2.39 However, to ensure high uniformity of heating, it is necessary to provide a certain ratio the steps of the turns and their radii are located so that the greatest amount of heat is detected in the turn with a smaller radius of the circle. The purpose of the invention is to increase heating uniformity. The goal is achieved by the fact that in the inductor the steps of the turns h with the radii of concentric circles R are in the following relationship: hi R m .1 where h is the step of the i-th turn, the step of the previous turn with the smaller circumference | radius of the concentric circle of the first turn radius of i-ro circle revolution. With such a Construction, a large amount of heat released in a coil with a smaller radius of circumference falls on a greater length of the workpiece. Due to averaging over the length, the same heating temperature is provided as in the adjacent areas heated by conductors located along circles with a large radius. FIG. 1 shows schematically an inductor with a heated billet, a general view of FIG. 2, a view A-A of FIG. 1, Multi-turn inductor 1 consists of active conductors 2, located around concentric circumferences and dlar turns of inductor h, equal to the sum of the width of coil E and the distance between turns b, decreases as the radius of concentric circles R increases, along which the turns of the inductor are located. The billets of 3 semi-axes with a diameter d are located along the radii of the concentric circles inside the inductor. The blanks are angled to each other and fill the inductor from position B to position c. When you turn on the current of high frequency, the active conductors 2 of the inductor 1 create an alternating magnetic field which induces an electrical current in the workpiece 3. The blanks begin to heat up and with the help of a rotating tola (not shown) move from position B to position C. During this time they heat up from the ambient temperature to warmth temperature evenly over the length L. The inductor performed by the proposed method has the following R X, - 360 mm; 470 mm-, Rj 546 mm; h 112 hri 70; h 3 30; At the same time, the relation for (2) and (3) is complete: hl R R t, e. 0.62 - 0.60, i.e. 0, 44. Uniform heating up to 1250 ° exists over a length of 250 mm. The proposed inductor, by ensuring uniform heating, provides for an increase in the quality of forgings, a reduction in scrap, and a reduction in the metal loss. Claims of the invention Inductor for heating, made in the form of a multi-turn coil with arcuately curved coils set in concentric circles, the width of each coil decreasing in the direction of increasing the diameter of these circles, characterized in that, in order to increase heating uniformity, the coils steps h with radii concentric circles R are in the following relationship: hj RT 1,: where h (- step of the i-ro turn-, h., - step of the previous coil with a smaller circle R - radius of the concentric circle of the first turn-, R. - The radius of the circle i-ro coil. Sources of information received note in the examination certificate USSR 1.Avtorskoe №275085, cl. C 21 D 1/42, 1970. 2. The patent of Great Britain f l048082, cl. H 5 N / H 05 B 5/00, 1963. 3 fi / g /  turned FIG. 2