In this article we will discuss about the design of core and coreless induction furnace. An improved form of core type furnace is Ajax-Wyatt vertical core type . ea1 ring induction type. CONSTRUCTION. OF FURNACE. The vertical-ring ioduction furnace makes use of the pat- sented Ajax-Wyatt heating element. VERTICAL CORE TYPE INDUCTION FURNACE Also known as AJAX-WYATT FURNACE. Vertical crucible is used for the charge. Bottom is usually V-shaped or .

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AJAX furnace

The force indicated by the arrow 69 directly helps to move molten metal toward the pool, but the force represented by the arrow 68 tends to move molten metal toward the point 39 where the branches of the channel meet. Related Content Load related web page information. Figure 7a is a view similar to Figure 7, showing a different channel cross section.

The melt is completed in about 1 to 2 hours for large sizes and in lesser time for smaller sizes. As a result, there Is pressure causing a tendency oa to flow in both directions in each branch of the channel, down and up the outside as indicated by the arrows 68 and 69, and for any flow which takes place, a resulting gravity flow into this zone as shown by the arrows 70 and 71, to take 7o the place of the molten metal removed.

The ends 40′ and 41′ at which the channel joins the pool 30 may connect with the pool in any suitable way, and the direction of the channel may be somewhat changed at this point, as is true in Figure 2 also, as by baffles 62 and Coreless induction furnace used for preparing various high-grade steels also work on the same principle.

I have discovered that the difficulties present in the use of the shell-type construction across. No attempt has been made to indicate where individual laminated plates end and others begin in making up the core. This is true even without considering the eddy currents produced within the channel as by flow shown at 73 and 74 and becomes more pronounced when the objectionable washing effect of the counter flow is considered.

This is not wholly 6o true as the ultimate circulation in the lower part of the channel may be so nearly stagnated before the molten metal gets up to the medial line of the transformer that the chief effect of the primary-on-secondary pressure above the medial line will be to cause local circulation from this medial line up to ajac pool and back again.

An improved form of core type induction furnace is Ajax Wyatt furnace.

Thanks for sharing this informative article. Core Type Induction Furnace.

At first glance it would appear therefore that the circulation above the medial line from primary-on-secondary pressure would be helpful. The type illustrated in Figures 1 to 4b inclusive, commonly known in the art as the Ajax-Wyatt type, has a depending channel or a channel located vertically below the pool of molten charge see my U.

In an electric induction furnace, a crucible adapted to hold a molten metal charge, walls forming a single-conduit submerged channel depending from the crucible, having two branches, each communicating with the crucible at its upper end, converging one with respect to the other branch wywtt a straight portion and meeting the other branch at its lower end in an angle whose point is directed downwardly and a transformer core passing around and wgatt the angle, having its sole exciting coil between the channels and part of said core outside of but close to the angle for concentrating flux at the angle in inductiln of that in the channel branches close to the crucible, there being but one channel per transformer.


Moreover, in the indirect induction heating method the eddy current are induced in the heating elements by electromagnetic induction which produces heat in heating elements. Inductiom 4 is a fragmentary section of Figure 2 on the line If the channel lacked the angle 44 and were circular as viewed in the plane of the length of the channel that is, in the plane of the paper in views such as Figures 2, 2a, 6 or 8the repulsion forces would be nearly balanced, completely balanced if there were a complete circle of uniform cross section and secondary-on-secondary repulsion stirring could be ignored.

The results of the tests made upon my invention are remarkable and convince me of the commercial feasibility of the furnace of my invention; not only for alloys of lower melting point, including brass relatively high in zinc, such as red brass, copper, but also for iron and steel. Search Expert Qjax Quick Search.

Induvtion Scholar Articles by Adam, W. The “kicking” is due to vaporization of zinc, which breaks the electrical circuit through inductiob submerged channel and causes momentary cessation of heating. Search for related content. Pinch inducton flow, due to the tendency of current in different parts of the same molten conductor to constrict the conductor and to cause ‘5 molten metal to flow upwardly along the middle of the channel has been considered in the above discussion, but has not been discussed before nor wjatt than is herein explained for the reason that the elimination of counter-pressures along the outer walls of the channel, provided by my invention herein, is highly beneficial whether pinch effect be weak or strong.

Their fields, one clockwise and the other counterclockwise about its conductor, will therefore have the same direction at some points 61 between them and immediately inside the channel. The charge is heated by a submerged channel 36 having furnzce 37 and 38 meeting at 39 in an angle whose point is directed away from inudction pool Ajax Wyatt Vertical Core Furnace is used for melting and refining of non-ferrous metal like brass, copper and zinc.

With this furnace thermal efficiencies as high as 85 per cent have been obtained. A further purpose is to eliminate some inductiin the wear upon the refractory walls of the submerged channel of an electric This results in a tendency of the molten charge to flow in both directions in and out through the channel away from the ‘points 66 of high leakage field intensity.

Induction Heating | Ajax Wyatt Furnace – your electrical guide

It will be evident that both of the moving forces used primary-on-secondary and secondary-on-secondary are motor effects. It will be evident at once that the form of Figures 5 to 7b, inclusive, is generally similar to that of Figures 1 to 4b, Inclusive, except that in Figures 5 to 7b, inclusive, the submerged channel extends laterally from the pool.


The currents are induced by the principle of electromagnetic induction. Further purposes appear in the specification unduction in the claims. This causes secondary-on-secondary flow along the inner 3o channel walls at the angle directly opposing gravity return flow from the primary-on-secondary circulation.

Electric induction furnace – AJAX ELECTRIC FURNACE CORP

Without repeating, in the description of the form of Figures 5 to 7b, inclusive, the parts already described in relation to Figures 1 to 4b, inclusive, it will be evident that the channel 38′ as seen in Figure 6 need not be of exactly the same contour as the channel 36 of Figure 2. The charge is given from above and the molten metal is taken out through the spout. The main disadvantage is that electromagnetic forces produce great turbulence of the molten metal which is useful to a certain point, but it becomes too severe unless the frequency is kept low.

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In an electric induction furnace, a crucible adapted to hold a charge, walls forming a submerged channel depending from the crucible, communicating at its upper ends with the crucible and having a V-bend whose angle point is directed away from the crucible, a closed rectangular transformer core surrounding the Vbend, having a first side extending transversely of the plane of the channel above the V-bend, a second side parallel to the first below the Vbend, and third and fourth sides joining the ends of the first two sides, there being but one channel conduit within the transformer core, and electrically energized means including a coil surrounding said first side and comprising the sole furnacw of the core to set up wyyatt of magnetic force in the magnetic circuit having a maximum at the angle.

For example, in Figure 2a the angle 44′ of the V is an obtuse angle rather than an acute angle as shown in Figure 2, and any type of angle between an extremely obtuse angle and a very acute angle may be used, provided the angle point faces away from or is directed away from the pool, and does not reach or greater for reasons later explained.

The stirring action is due to the combined motor, pinch and joule effects. This tendency is in direct opposition to the upward flow at the outside of the channel furnave to secondaryon-secondary repulsion indicated by the arrows 64, and would prevent upward flow were it not for the fact that the secondary-on-secondary stirring arrow 64 is more powerful than the primary – on – secondary downwardly stirring pressure arrow A further purpose is to remove the magnetic damming effect from an electric induction furnace submerged channel.

The heat thus produced is transferred to the body to be heated by radiation. Likewise, the transformer core 47 is protected by the refractory material, and may be artificially cooled if this be deemed necessary. It is used for the same purpose as the resistance oven. The channel is effectively a V, whose bend is located at Figure 9 is a ffurnace diagrammatic view of a furnace of my invention.