SU699033A1

SU699033A1 - Method of tube enameling

Info

Publication number: SU699033A1
Application number: SU742053531A
Authority: SU
Inventors: Залман Исаакович Меркинд
Original assignee: Уральский научно-исследовательский институт трубной промышленности
Priority date: 1974-08-09
Filing date: 1974-08-09
Publication date: 1979-11-25

Description

II

Изобретение касаетс эмалировани труб.The invention relates to enameling pipes.

Известен способ эмалировани груб, включающий нанесение эмали и обжиг покрыти . Однако при этом способе перец нанесением каждого очередного сло эмали необходимо охлаждение издели до комнатной температуры, что требует времени и дополнительных площадей.There is a known method of enameling coarse comprising applying enamel and burning the coating. However, with this method of pepper, applying each next layer of enamel requires cooling the product to room temperature, which requires time and additional space.

Цель изобретени - снижение энергозатрат и осуществление двухстороннего эмалирование труб.The purpose of the invention is to reduce energy consumption and the implementation of double-sided enameling of pipes.

Дл этого предлагаетс способ, в котором эмаль нанос т на поверхность трубы , предварительно нагретую до 450750 С, а после обжига издели охлаждают водовоздушной смесью до температуры затвердевани эмали.To this end, a method is proposed in which enamel is applied to the surface of a pipe, preheated to 450,750 ° C, and after firing, the product is cooled with an air / air mixture to the enamel hardening temperature.

Предложенный способ позвол ет получать трубы с двухсторонним покрытием при одном нагреве, дл чего наружное -покрытие нанос т на трубу с нанесенным но не обожженным внутренним слоем, и атем обжигают, при этом происходитThe proposed method allows to obtain pipes with double-sided coating with one heating, for which the outer coating is applied to the pipe with the applied but not burned inner layer, and then it is burned.

оплавление как наружного, так и внутреннего покрыти .melting of both external and internal coating.

Кроме того, нанесение эмали на нагретую поверхность позвол ет снизить энергозатраты при индукционном обжиге.In addition, the application of enamel on a heated surface reduces the energy consumption during induction firing.

Изобретение может быть проиллюстрш- ровано следующим примером.The invention can be illustrated by the following example.

Claims

The rotating pipe with a diameter of ZOOmm and a length of 12 m is moved along the supports at a speed of 6 m / h successively in separate sections, heated with gas burners to 70 ° C, and cleaned from scale. By the time the enamel is applied, the surface has a temperature of 450 ° C. Subsequently, when the pipe moves to a free end to its free end, its length; 4-5 m, enamel frit powder is applied in an electrostatic field. Floor firing is carried out at a temperature of 80 ° C-900 ° C by induction. At a distance of 1.5-3.0 m from the inductor, the tube with a burnt coating is intense, but it is cooled in a water-air medium to a temperature below 300 ° C. Then the cooled end of the rotating tube with the turned enamel coating is moved along the supports. In order to obtain an airborne coating, the second layer is applied when the surface is cooled after induction firing to 40 ° -45 ° C, is fired and only then is the surface cooled below 300 ° C. The second layer as well ;. applied to the section of the supportless (cantilever) reamer of the pipe. Reducing energy costs is achieved due to the fact that pre-heating up to 60O-75O C e "is given by gas burners cheaper than the induction method. Induction heating is not applied from room temperature, but from 400 ° C. 69 34 The proposed method makes it possible to carry out a continuous technological process of both one-sided external and two-sided enameling of pipes. The method of enameling pipes, including applying enamel and burning the coating, characterized in that, in order to reduce energy costs and ensure the possibility of two-sided enameling of the pipes in one firing, the enamel is applied to the surface of the pipe previously heated to 450,750 ° C, and after firing, the product is cooled with a water-air mixture to a temperature of "hardening of the enamel.