SU1397683A1 - Continuous furnace for heating blanks - Google Patents

Abstract

The invention relates to devices for heating a metal before pressure treatment and can be used in the metallurgical and other industries. The purpose of the invention is to improve the technical and economic performance of the furnace, the reliability and service life of the supporting device. In the methodical furnace, the intensification of the lower heating is achieved by the fact that the longitudinal supporting water-cooled devices are located at a distance from the finisher of the tilting zone equal to 1.4-1.6 times the length of this aoHbf. In the supporting device, between the rater and the water-cooled pipe, there is a turn of the gasket along the length of the gasket and heat-insulating layers installed flush with them, while the width of the heat-insulating layer is 2-3 times greater than the width of the water-cooled support. 2 hp Py., 6 Il. (L

Description

00 UD

ci:

00

with

The invention relates to devices for heating a metal prior to pressure treatment and can be used in the metallurgical and other sectors of the industry.

The purpose of the invention is to improve the technical and economic performance of the furnace, reliability and service life of the kiln support device.

FIG. 1 shows the method furnace} in FIG. 2 shows section A-A in FIG. one; in fig. 3 - supporting device; in fig. 4 shows a section BB in FIG. 3; in fig. 5 - blacksmith forging oven; in fig. 6 shows a section B-B in FIG. five,

The methodical furnace includes the upper and lower methodical and welding i-iyyo, as well as the upper heating zones limited by refractory masonry of the walls. . vault and hearth, separated by a system of longitudinal 1 and transverse 2 cooled support pipes at the level of the sub-core don

the upper and lower sections, equipped in the end walls of the welding and tomilion zones with burners 3. Under the tomiline zone, they are made in the form of longitudinal support devices 4 arranged with a gap, joined in a welding zone with a system of cooled longitudinal support tubes, equal to 1.4-1.6 the length of this zone. The underfloor space of the tomiline zone, communicating with the lower parts of the welding and methodical zone, is equipped with 5 o burners mounted at the zone end.

 A support device, for example, a method furnace, includes a rider 6 mounted on a water-cooled support 7 along its length. The unloading pads 8 alternating along its length are placed between the rater and the water-cooled support, located on the cast metal platform 9 and the heat insulating layer 10 installed flush with them, for example, 5 because of heating irregularity. At: the distance from the end of the tiltile zone equal to 1.4-1.6 the length of this zone, the metal falls on the supposed support device 4. The underfloor space of the tilting zone is equipped with burners 5 to provide two-sided heating.

For actual conditions, the heat flux to the lower surface of the metal approaches zero at a temperature of the lower surface of about 1100 ° C, usually achieved in the middle of the active length of the furnace, i.e. at a distance of 4–6 the length of the tilar zone from its end (counting from the dispensing window), the heat flux to the lower surface of the metal becomes close to zero and even becomes negative (from the surface of the metal). Therefore, with a support length of more than 1, 6 the length of the tomiline zone, the efficiency of the lower heating is insignificant due to the fact that the temperature of the metal is less. When the support is less than 1.4, the temperature of the metal reaches 1150-200 s and the outflow of heat from the metal to the water-cooled supports increases.

When transporting on the support device (FIGS. 3 and 4), the

The metal is in direct contact with raters 6 made of high-temperature alloys. The loads from the raters through the hull of the refractory layers 10, the discharge strips 8 are transferred to the water-cooled support 7. The width of the refractory layer 10 is 2-3 times larger than the transverse dimensions of the water-cooled support. Thus, the surfaces of the supporting device optically interacting with the metal being heated are thermally insulated from a cooled support, for example, with a layer of refractory brick, ensuring uniform heating. Dark spots formed at the beginning of the welding zone are eliminated. If the width of the insulation is three

thrust brick. The width of the refractory "times the width of the cooled

support, then the screen area increases, reducing the heat flux from the lower side by 2-3 times the transverse dimensions of the water-cooled support.

The furnace works as follows.

The heated metal is moved along the transverse 2 and longitudinal 1 hearth supports in the methodical and welding zones. In this case, dark spots remain in the heated billets in the places of contact with the cooled support.

55

zone on the metal, h, which leads to uneven heating of the workpiece. With an insulation width less than twice the width of the cooled support, a direct heat flux of radiation from the heated metal to the cooled support occurs.

zone on the metal, h, which leads to uneven heating of the workpiece. With an insulation width less than twice the width of the cooled support, a direct heat flux of radiation from the heated metal to the cooled support occurs.

The proposed support can also be used in forging furnaces with draw-out hearths (Figs. 5 and 6). The ingots or forgings 11 are placed on the support device 12 mounted on the roll-out hearth 13. With the help of the supports 12 there is a gap between the ingots 11 and bottom 13. It allows the furnace gases to circulate in this gap during the heating period. In addition, the use of supports 12 has a positive effect on the resistance of the hearth, increasing the service life of refractories.

Technical and economic efficiency of the invention is achieved by nyTejxt improving the efficiency of lower heating. It also provides an increase in the productivity of heating furnaces by 11% and a uniform heating of the billets over the cross section.

Claims (3)

1. Methodical furnace for heating billets containing walls, under, arch, upper and lower methodical and welding zones, as well as a heating zone, a system of longitudinal and transverse water-cooled 3 in pipes placed at the hearth level, burner devices installed in the end walls of the welding and tilting zones, characterized in that, in order to improve the technical and economic performance of the furnace by intensifying bottom heating, it is equipped with shielding devices placed on longitudinal water-cooled pipes from the end of the tomiline zone at a distance of 1.4-1.6 the length of this zone. 2. The furnace according to claim 1, characterized in that the shielding device is made in the form of a support assembly consisting of a raiter, a metal platform with installed on it with spacers alternating along the length of the shielding device, as well as heat insulating layers installed flush with them, the width of the heat insulating layer 2-3 times more water-cooled pipe. 3. Furnace popp. 1 and 2, characterized in that the underfloor space of the tiling zone is equipped with end burners. Ll SfeSSm .five V Fig.Z one s / r / Vu.6