SU845299A1

SU845299A1 - Device for high frequency heating of thick sheet articles with notches

Info

Publication number: SU845299A1
Application number: SU792792638A
Authority: SU
Inventors: Вячеслав Александрович Бодажков; Дмитрий Леонидович Зубер; Леонид Леонидович Кочергин; Вячеслав Михайлович Смирнов
Original assignee: Предприятие П/Я Г-4585
Priority date: 1979-07-06
Filing date: 1979-07-06
Publication date: 1981-07-07

Description

II

Изобретение относитс к электротермии и предназначено дл индукционного нагрева боковой поверхности тел сложной конфигурации, в частности крупногабаритньк плоских изделий , вырезанных из толстолистовой стали.The invention relates to electrothermal and is intended for induction heating of the lateral surface of bodies of complex configuration, in particular large-sized flat products cut from thick steel.

Известен индуктор дл одновременного нагрева скоб, вьтолненный в виде охватывающего скобу токопровода с приваренным вкладышем из листовой меди. Вкладыш расположен в зазоре между токопроводом и впадиной скобы f1 .A known inductor for simultaneous heating of staples, embodied in the form of a conductor covering a staple with a welded copper sheet liner. The liner is located in the gap between the conductor and the hollow of the bracket f1.

Недостатком известного индуктора вл етс невозможность регулировать величину передаваемой энергии на участке впадины скобы, в результате чего достижение равномерного нагрева боковой поверхности скобы производитс предварительным подбором формы приваренного вкладьппа. А это усложн ет конструкцию индуктора и его изготовление.A disadvantage of the known inductor is the inability to regulate the amount of transmitted energy in the region of the hollow of the bracket, as a result of which uniform heating of the side surface of the bracket is achieved by preselection of the shape of the welded insert. This complicates the design of the inductor and its manufacture.

Известно также устройство дл высокочастотного нагрева изделий с вырезами, содержащее индукционную катушку, образующую полость дл размещени нагреваемого издели , на внутренней стороне которой установлены вкладыши из немагнитного материала с высокой проводимостью, форма которых повтор ет конфигурацию вырезов издели , вьтолненных в виде It is also known a device for high-frequency heating of cut-out products, comprising an induction coil forming a cavity for accommodating a heated product, on the inner side of which there are inserts of non-magnetic material with high conductivity, the shape of which repeats the configuration of the cut-outs of the products.

10 короткозамкнутого витка с магнитопроводом 2j,10 closed loop with magnetic core 2j,

Недостатком известного устройства в случае использовани его дл нагрева плоских крупногабаритных The disadvantage of the known device in the case of its use for heating flat large-sized

15 изделий сложной конфигурации с вырезами по контуру различной формы вл етс невозможность регулировать плотность наводимого тока в нагреваемой боковой поверхности выреза. 15 products of complex configuration with cuts along the contour of various shapes is the impossibility to regulate the induced current density in the heated side surface of the cut.

20 Несмотр на наличие внутри вкладыша магнитопровода и независимо от формы выреза, а следовательно,и от формы вкладьш1а, электромагнитна св зь между токопроводом и вкладьшами будет посто нной и одинаковой во всех вырезах. Вне зависимости от формы вырезов плотность наведенных токов в боковой поверхност одинакова, но теплопередача в каждом вырезе от поверхностных слоев вглубь издели различна. Поэтому дл получени равномерного нагрева по всему периметру издели необходимо ,-чтобы электромагнитна св зь между вкладышами и токопроводом была бы неодинаковой и обеспечивала бы в боковой поверхности вырезов температуру, равную температуре поверхности вьшуклых участков.20 In spite of the presence of a magnetic core inside the liner, and regardless of the shape of the notch, and consequently, of the shape of the insert, the electromagnetic coupling between the conductor and the insert will be constant and the same in all the notches. Regardless of the shape of the cutouts, the density of the induced currents in the side surface is the same, but the heat transfer in each cutout from the surface layers to the inside of the product is different. Therefore, to obtain uniform heating around the entire perimeter of the product, it is necessary that the electromagnetic coupling between the inserts and the conductor would be unequal and provide a temperature in the side surface of the cutouts equal to the surface temperature of the convex portions.

Целью изобретени вл етс повышение равномерности нагрева изделийThe aim of the invention is to improve the uniformity of heating products.

Поставленна цель достигаетс те что в данном устройстве каждый магнитопровод выполнен П-образной формы , охватывает разомкнутыми концами торцы токопровода и вкладьша и снабжен механизмом возвратно-поступательного перемещени его в плос ,кости, перпендикул рной плоскости катушки. При нагреве изделий толщи|ной более учетверенной величины зазора между токопроводом и изделием , вкладыш выполнен в виде короткозамкнутого соленоида.The goal is achieved by the fact that in this device each magnetic core is made U-shaped, covers the ends of the conductor and the insert with open ends and is equipped with a mechanism for reciprocating it in a flat, bone, perpendicular to the coil plane. When products are heated with a thickness of more than fourfold, the gap between the conductor and the product, the liner is designed as a short-circuited solenoid.

На фиг. 1 изображен общий вид предлагаемого устройства; на фиг.2разрез А-А фиг,. 1; на фиг. 3 разрез Б-Б фиг, 2,FIG. 1 shows a general view of the proposed device; FIG. 2 shows section A-A of FIG. one; in fig. 3 section bb figs 2

Устройство дл индукционного нагрева состоит из изолированного водоохлаждаемого токопровода - индуктора 1, охватывающего изделие 2, Токопровод I укреплен на стойках . 3 и подключен к генератору токов высокой частоты (на чертежах не показан ). Изделие 2 по периметру имеет сложные вырезы 4 и 5. В вырезах The device for induction heating consists of an insulated water-cooled conductor - inductor 1, covering the product 2, Current lead I is fixed on racks. 3 and connected to the generator of high-frequency currents (not shown in the drawings). The product 2 has complex cuts 4 and 5 around the perimeter. In the cuts

.4 и 5 в зазорах между токопроводом 1 и изделием 2 установлены вкладыши 6, выполненные в виде водоохлаждаемых короткозамкнутых витков. Вкладьшш 6 изолировано закреплены на токопроводе 1,.4 and 5 in the gaps between the conductor 1 and product 2 installed inserts 6, made in the form of water-cooled short-circuited coils. Insert 6 is insulated on the conductor 1,

CHapy ji токопровода 1 на изол ционной плите 7 жестко закреплены пакеты П-образного магнитопровода 8. Магнитопровод 8 свободными конца ми охватывает торцы токопровода 1 и торцы вкладьша 6. Плита 7 установлена подвижно в направлющих 9. ВCHapy ji of conductor 1 on the insulating plate 7 are rigidly fixed packages of U-shaped magnetic conductor 8. The magnetic conductor 8 with free ends covers the ends of the conductor 1 and the ends of the insert 6. The plate 7 is mounted movably in the guides 9. In

боковой стенке направл ющих 9 установлен регулировочный винт 10, который проходит через паз боковой стойки плиты 7, Свободный конец винта 10, проход щий через паз плиты 7, снабжен полусферической головкой и прикреплен к плите .7,The side wall of the guides 9 is fitted with an adjusting screw 10, which passes through the groove of the side stand of the plate 7. The free end of the screw 10 passing through the groove of the plate 7 is provided with a hemispherical head and attached to the plate .7,

Устройство работает следующим образом.The device works as follows.

Claims

The article 2 is laid on the height adjustable stops I1. By means of the screw 10, the Magnetic circuit B is set to a corresponding distance from the side surface of the cutouts 4, 5, which is selected depending on the given heating intensity of this side surface and is within 1-0.25 of the maximum gap between the current lead I and the side surface of the cutouts 4, 5. For intensive heating — 0.25, for less intense — 1. Then a high-frequency voltage is applied to the conductor I and a current is induced in the product 2, which heats the side surface of the straight-line sections to configurations to a predetermined temperature Simultaneously, a current is induced in the input 6. The direction of the induced current in the insert 6 is opposite to the direction of the current in the conductor 1, due to the fact that the insert 6 is a short-circuited coil, the current flowing along the side of the insert 6 repeating the cutout configuration 4, 5, coincides in direction with the current of the conductor I, the magnetic flux created by the conductor 1 splits into two parts: the smaller part passes through the plane bounded by the contour of the contour 6, and the other is large part through the gap between the insert 6 and the side surface of the notch 4 (5). The movement of the magnetic circuit 8 provides for the regulation of the magnitude of the electromagnetic coupling (the conductor insert 6), which leads to a change in the ratio between the two components of the magnetic flux, which determines the heating intensity of the side surface of the notch 4, (5). Thus, the required mode is achieved, which ensures uniform heating of the product 2 over the entire configuration. Claim 1. Device for high-frequency heating of plate products with cutouts, containing an induction coil, forming a cavity for distributing the heated product, on the inner side of which there is an insert made of non-magnetic material with high conductivity, the shape of which is shaped as a short-circuited coil with magnesium topow, characterized in that, in order to increase the heating uniformity, each magnetic circuit is made U-shaped, covers mknutymi ends torus tzu current conductor and liner and is provided with IG ebicoKovacfnom emeratooi

Fig. 1 9 (by the mechanism of its reciprocating movement in a plane perpendicular to the plane of the coil. 2. The device according to claim 1, about tl and ensuring uniform heating of the side surface of the product with a thickness of more than fourfold the gap between the conductor and the product, the insert is made in In the form of a short-circuited solenoid. Sources of information taken into account during the examination 1. Lozinsky MG Surface hardening and induction heating of steel, M., Mashgiz, 1949, pp. 189, Fig. 192.

2. USSR author's certificate for application number 2373457 / 25-27, cl. H 05 B 5/18, 1977. noMy

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