SE466947B - DEVICE FOR CONTINUOUS CASTING - Google Patents

Description

4-66 947 10 15 20 25 30 copper, bronze, brass but also aluminum and steel are conceivable.

Examples of casting speed are 120 m / h and belt speed 20 m / s.

As mentioned, the belt can be moved towards alt along or across the casting string or at another angle. The belt (s) can be tensioned, for example, by one or more cooling rollers, for example by means of hydraulic, pneumatic or mechanical tensioning means.

The casting can be done horizontally as well as vertically or arbitrarily inclined. By "transverse" is meant here both 900 and the acute angle to the vertical and / or horizontal plane.

In this case, buckling of the strip due to heat can be avoided, which also takes place by instantaneous buckling due to high heat at the casting site is quickly counteracted by the gap created by the buckling, which locally reduces the heat flow, whereby instantaneously formed gap quickly disappears.

At the web of the belt, suitably after the casting site, the belt can be cleaned, for example mechanically (such as with brushes), hydraulically (water) or pneumatically, and thus the belts can be clean when passing the casting site before re-coating with eg oil.

The invention is exemplified in the accompanying figures, of which Fig. 1 a shows cooling belt movement across and Fig. 1 b along the casting direction according to the invention. Fig. 2 shows a detail of the casting and Fig. 3 an alternative embodiment. Figure 4 is an illustration of the calculation below.

Fig. 1a shows a transverse cooling strip when casting a casting string 1, where the casting section is laterally limited by two plates 2,3 of a resistant type (not included in the invention itself).

Two endless belts 4,5 of steel, copper, brass, etc. are moved quickly (faster than the casting speed) across the casting direction (see arrows), each around rollers (6,7 and 8,9 respectively), whereby at least one is also a cooling roller in each strip web, cooled by circulating coolant. The strips 4,5 form either direct side walls in the casting section, or together with a solid graphite plate, the latter directly adjacent to the casting 4ee.947l string, side walls in the casting section. In the latter case, the strip cools the casting strand and the plate by means of contact with the graphite plate.

Due to the fast movement, the string is cooled efficiently as stated above. The casting direction is perpendicular to the direction of travel of the belt.

In figure 1 b the casting takes place vertically from a tundish 10. At 11 the non-solidified part of the casting string 12 (swamp) is shown, and in this case the belts move towards the alt along the casting direction (see arrows 1 or 2).

Figure 2 shows the sump 15 during vertical casting, surrounded by the two cooling bands 16 and 17.

Figure 3 shows a tundish 18 and graphite plates 19,20 at the long sides of the string 21, where the solidification of the melt itself is to take place. In contact with the graphite plates, located outside these, the cooling bands 22 and 23 move together or in the opposite direction. The straps can be tightened as shown in Figs. 1 a and 1 b.

Figure 4 shows a part of a casting string. Width B (m), thickness H (mm), length L (m) of the solidification zone (swamp), casting speed c m / hour (h). q is latent heat kcal / kg. qf = physical heat.

Heat emitted: W x H x y x (q + qf) x C kcal / h (y = specific gravity).

Occupied heat: Definitive cooling belt thickness in mm h "" speed w / en "width m B" Spec. Weight (cooling belt) Y (KB) "" heat C (KB) "Temp. Increase OC AT x AT x 2 Occupied heat = B xhx V x 3600 x YKB x C (KB) (KB) x 7200 x AT H x Y x (q + qf) = H x V xy (KB) x CH xc (q + qf) h X v X CKB X 7200 466 947 '10 15 4 1 1 x - 1o'3 Heat flow (Q) É- = ax Ä (SB) MQ = kx W xhx (TSM - TKB) x 2 5 k heat transfer coefficient kcal / OC-m2-h (h = hour) 'J x shell thickness (see fig 2) mm a (K_> B) heat transfer coefficient string band AM heat conduction number in string TSM - TKB temp. difference string-cooling belt Cast quantity / h = Q / (q + qf) This shows The invention can be varied in many ways within the scope of the following claims.

Claims (1)

A device for continuous casting of metals, metal alloys or steels, where melt is tapped into a casting section for continuous casting, laterally defined by four side walls, characterized in that an opposing pair of walls consist of transverse or against, alternatively with the direction of casting moving bands, running at a speed much greater than the casting speed, or indirectly adjacent to the casting strand via each fixed plate of carbon-containing materials, such as graphite or similar materials. Device according to claim 1, wherein the cooling strips are arranged to run against the graphite plates, and that any lubricant and / or insulating means are arranged to be applied to the space between the graphite plates and the cooling strip. . Device according to claims 1-2, characterized in that perpendicular to the belts are arranged pressure generating means, acting against the casting string, mechanically, hydraulically or pneumatically actuated, intended to limit or eliminate any gaps between the cooling strips / graphite plates and the casting string. Device according to claims 1-3, characterized in that the cooling belts are arranged to run in a closed path past the casting zone and via two or more cooling rollers. Device according to claim 4, characterized in that each pair of belts is tensionable in that force is arranged to be applied to each roll per belt. . Device according to claims 1-5, characterized in that the strip is arranged to be cooled by the cooling rollers or some of these by means of the same circulating coolants. Device according to one or more of the preceding claims, characterized in that at least one roller per cooling belt is driven. . Device according to one or more of the preceding claims, characterized in that the cooling strip (s) on their side facing the casting strand are knurled and / or that the strip (s) are perforated.