SU1526892A1 - Arrangement for making metal bands by quick cooling from molten state - Google Patents

Abstract

The invention relates to metallurgy, and more specifically to the continuous casting of metals. The aim of the invention is to simplify the design of the device and increase reliability in operation. The side walls 4 of the roll-mold 1 are provided with ribs 5 on the outside, are inclined with a decrease in width from the inner rim 3 to the outer rim 2 and are a centrifugal heat pipe. On the side walls, ribs are provided on the outside to increase the cooling surface. Inside, the outer rim and side walls are lined with a capillary-porous wick and impregnated with a refrigerant. Molten metal is applied to the surface of the rim, the layer of which solidifies, and the heat from the rim is removed by the coolant. 2 Il.

Description

This invention relates to metallurgy, specifically to the continuous casting of metals.

The aim of the invention is to simplify the design of the device and increase the reliability of its operation.

Figure 1 shows the device, a general view; in fig. 2 - the same side view

The device contains a rotating

roller mold 1 with outer 2 and inner 3 rims of inclined side walls k with outer ribs

5. The outer rim and side walls are lined with a capillary-porous wick 6 The mold is mounted on axis 7. A casting system 8 with a melt 9 is located near the mold.

The device works as follows.

The outer rim 2 of the rotating roll 1 captures from the gating system 8 a layer of melt 9- After heating the rim, the layer hardens and turns into tape 10. At the same time, as the roll rotates, the particles of the liquid refrigerant drag the centrifugal force to the outer wall rim 2 where evaporated in a capillary-porous wick

6. The refrigerant vapor rushes at the lowest pressure zone — toward the air-cooled sloping outer side walls k, finned from outside, where it is condensed, heating them. The heat release occurs by washing the outer surface of the side walls k and the ribs 5 placed there along the concentric circumference by an air flow that resists rotation. Thus, the outer surface of the side walls

C with fins 5 are air-cooled heat exchangers. Liquid coolant particles condensed in the capillary-porous wick of the side walls are supplied by centrifugal forces to the outer rim 2. A closed evaporative-condensation cycle occurs.

The main heat release is inclined side walls with ribs

5. The intensity of heat exchange with the air from the free part of the outer rim 2 is small compared to them, since the rim has a smooth surface. Heat exchange of the inner rim 3 neglected

0

50

5 Q

Q

c

five

0

five

very small, as there is a stagnant air zone.

The exhaust heat flow during forced convection depends on the rate of washing of the cooled surface with air (cooling intensity), as well as on the area of the washed surface. When the round bodies of a rectangular profile rotate as they approach the center, both the cooling intensity due to a decrease in the relative linear velocity of washing and the area of the washed side surfaces decrease, which leads to a sharp decrease in heat release. In order to increase the heat flow removed from the side walls in the proposed device, the mold roll is made in the form of a centrifugal heat pipe with inclined side walls with a decrease in width from the inner rim to the outer one. This makes it possible to increase the area of the side air-cooled walls, and hence, respectively, the value of the Divergent heat flux.

The use of externally ribbed side walls at the same time as the condenser of the heat pipe and the cooled air of the heat exchanger reduces the temperature differential across the pipe and thereby increases the cooling rate of the melt.

Example. Roll-mold is made in the form of a centrifugal heat pipe of trapezoidal profile. The outer diameter of the roll is 200 mm, internal 50 mm, width 0 mm, the angle of inclination of the side wall to the vertical 30. Outside on each inclined side wall there are eight concentric rows of edges 3 mm wide each. The body of the roll is M2 copper. A capillary-porous wick 2 mm thick is applied on the inner surfaces of the outer rim and side walls. Wick material - sintered copper spherical balls with a diameter of 0.8-1 mm. Heat carrier in heat pipe - distilled water.

Preliminary tests showed the following. The device is fully operational and can be used to obtain rapidly cooled strips of aluminum alloys. The thickness of the belts is from 0.13 mm with a roll rotation speed of 50 rev / s to 0.05 mm at a frequency of 150 r / sec. The performance of the device is 32kg / h.

During the operation of the device, no coolant was required, as it was normally cooled by air due to forced convection. The heating of the working surface of the mold did not exceed 150 ° C at a frequency of 50 rev / s, and at a frequency of 150 rev / s did not exceed 110 ° C

Characteristics of the resulting lent: microstructure - blurred halo; tensile strength of extruded samples 3 0-350 MPa; relative lengthening of 5%.

Since the sample does not require water, the 5-roll crystallizer is supplied with intercooling, with the performance on the outer side and the space of 32 kg / h of aluminum tape it is saved by the wife obliquely with decreasing width

At least 0.7 m3 / h of running water. From the inner rim to the outer one.

rmula

inventor

A device for producing metal tapes by the method of rapid cooling from a liquid state, comprising a gating system and a driving roll-mold made in the form of a centrifugal heat pipe with external and internal rims and side walls, characterized in that, in order to simplify the design of the device and increase the reliability of his work, side walls

eight

Claims (1)

Claim A device for producing metal tapes by the method of rapid cooling from a liquid state, comprising a sprue system and a drive roll-crystallizer made in the form of a centrifugal heat pipe with external and internal rims and side walls, characterized in that, in order to simplify the design of the device and increase reliability his work, the side walls of the roll-mold are equipped with ribs on the outer side and are inclined with decreasing width from the inner rim to the outer.