COQUIL A REFRIGERATED WITH LIQUID FOR THE CONTINUOUS METAL COLLAR
FIELD OF THE INVENTION The invention relates to a cooled shell with liquid for the continuous casting of metals according to the characteristics of the preamble of claim 1. A shell of this type is known from DE 102 37 472 A1. The use of this type of mold plates in continuous casting installations may cause unexpectedly high local thermal loads in certain process parameters due to the high thermal supply of the casting process. BRIEF DESCRIPTION OF THE INVENTION From this the invention aims to improve a chilled shell with liquid of the type under consideration in relation to its cooling capacity to prevent thermal overloads and to increase the useful life. This problem is solved with a cooled shell with liquid having the characteristics of claim 1. The favorable refinements of the idea of the invention are subject of the subordinate claims. In order to locally increase the cooling effect of the cooled chill with liquid, it is proposed that the REF: 169604 side of the refrigerant comprises cooling fins projecting into the interstice of the cooling medium arranged between two adjacent landing bases. The cooling fins in the sense of the invention are elevations in the manner of bridges that are oriented in the same direction as the landing bases. The cooling fins protrude at least partially into the interior of the coolant gap, that is to say that, like the landing bases, they rise on the refueling side. The height of the cooling fins, and thus of the contact surface with the coolant, can be increased by arranging a groove made on the coolant side between two cooling fins. In this way it is possible to at least partially increase the cross section of flow decreased by the cooling fins, so that also without reduction of the cross section of flow a better cooling effect is obtained in the area provided with the cooling fins . However, it is primarily intended to reduce the cross section of flow in order to increase the flow rate of the refrigerant. This results in a better local thermal transmission from the mold plate to the coolant, and thereby a better cooling of the mold in this area. In addition, the cooling surface is increased in these areas by the cooling fins, which also results in better cooling. By means of the best cooling it is possible to reduce in this zone the plate thickness of the mold plates. This results in a smaller separation distance between the so-called hot side, oriented towards the molten material, and the coolant. The flow cross section is not narrowed by reducing the thickness of the plates, ie the width of the coolant gap remains the same. The variations of the cross section result solely from the cooling fins provided, by which the temperature level in this area of reduced thickness is reduced. The cooling fins are located in particular in the region of the bath level of the mold by virtue of the fact that this is where the highest thermal loads are produced according to the invention. Fundamentally, the cooling fins must have dimensions that do not allow excessive increase in pressure losses inside the coolant gap. In the case of an excessively high pressure loss, there is a risk of the formation of vapor bubbles, which considerably worsens thermal transport. Additionally there is a risk that with a loss of excessively high pressure there will be a reduction in the amount of refrigerant, that is, the volume of flow. The flow volume can not be increased at will by virtue of a preset maximum pressure. Basically, arrange the cooling fins parallel to the flow direction of the coolant inside the coolant gap. Conveniently, however, the cooling fins comprise longitudinal sections that form an angle with respect to the direction of flow. In this aspect an angular region of up to 45 ° is considered convenient. The selected angle can vary along the longitudinal extension of the cooling fin, that is, an extension in the form of a serpentine line is also conceivable. By angulating at least in sections or extending into curves it is possible to produce additional flow turbulences which improve the thermal transmission between the coolant side of the shell plate and the coolant. The cooling fins in the shape of serpentine lines have the advantage that they can adapt in their extension to the aerodynamic contour of the landing bases. In a convenient configuration of the idea of the invention, the adjacent cooling fins and the flow channels configured by cooling fins and adjacent landing bases conveniently have an invariable cross section along their longitudinal extension to limit the pressure losses inside. of the flow channels. In suitable development, the landing bases can be arranged aligned in vertical rows and aligned in horizontal rows, where the landing bases of two successive horizontal rows are disposed transposed to each other in the horizontal direction. By this a partial compensation is created for the higher pressure losses of the pressure medium that occur due to the cooling fins. With an arrangement of the landing bases in horizontal and vertical rows without the successive horizontal rows being transposed to one another, a pulsating flow of the refrigerant results, because the flow of refrigerant suffers in the flow direction repeated narrowing of the coolant. the cross section and widening of the cross section. This interdependent effect can be reduced by the fact that the landing bases of the successive horizontal rows are arranged transposed with respect to one another in the horizontal direction. The pulsation of the flow of the refrigerant is the minimum if the landing bases of two successive horizontal rows are transposed to each other by half the horizontal distance of adjacent landing bases. With an arrangement of this type also the resistance to flow is the minimum. BRIEF DESCRIPTION OF THE FIGURES The invention is explained below by means of two exemplary embodiments represented in the figures, which show: Figure 1 in perspective representation the rear view of a first embodiment of a mold plate observed in the direction of the landing bases; Figure 2 corresponding to the representation of figure 1 another embodiment of a shell plate of this type; 3 shows an amplified cut-out of the mold plate of FIG. 1, and FIG. 4 shows an enlarged cut-out of the mold plate of FIG. 2. DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a mold plate 1 which is fixed to the mold. an adapter plate not mostly represented. The mold plate 1 and the adapter plate constitute a plate unit of a liquid-cooled mold not mostly shown for the continuous casting of metals. The shell plate 1 consists of copper or a copper alloy, preferably with a limit of expansion
> 350 Mpa, being that the resistance fundamentally can also be smaller. The mold plate 1 has an irregular wall thickness. Alternatively, the mold plate has a constant wall thickness throughout its length. For the cooling of the shell plate 1 with coolants, a coolant gap is provided between the shell plate 1 and the adapter plate whose height is determined by landing bases 3 protruding from the side 2 of the coolant. The configuration of the landing bases 3 is substantially in the shape of a rhombus, and with it they adapt favorably to the flow direction S of the refrigerant in the technical aspect of flow. The landing bases 3 are configured in this example of a one-piece construction with the mold plate 1. The important thing is that in the mold plate 1 according to the invention cooling fins 4, 5, 6 are arranged in sections between adjacent landing bases 3 on the side of the coolant. The cooling fins 4, 5, 6, 7 extend substantially in the flow direction S of the coolant and are arranged in the region of the bath level of the metal broth. In this embodiment, the fins 4, 5, 6, 7 extend over a height that encompasses three landing bases. Although it is true that the fins 4, 5, 6, 7 are aligned fundamentally in the flow direction S, they nevertheless extend in the form of a serpentine line, that is, they comprise several curves. The position of the curves is adapted to the arrangement of the landing bases 3. This results in flow channels 8, 9, 10 with constant cross section. The flow channels 8, 9, 10 are formed by adjacent cooling fins 4, 5, 6, 7 as well as cooling fins 4, 5, 6, 7 adjacent to the landing bases 3. It is possible to recognize that the landing bases 3 are arranged aligned in vertical rows V as well as aligned in horizontal rows Hl, H2. The landing bases 3 of two successive horizontal rows Hl, H2 are arranged transposed in the horizontal direction. In this exemplary embodiment, the landing bases of the horizontal rows Hl and H2 are arranged transposed to one another by half the horizontal distance H. The die plate of FIG. 2 is substantially analogous to that of FIG. 1, with the difference that the landing bases 3 of two successive horizontal rows H3, H4 are not transposed to one another in the horizontal direction. Figure 3 shows an amplified cut-out of the zone of the shell plate 1 provided with cooling fins 4, 5, 6, 7 by which the development of the fins 4, 5, 6, 7 can be more clearly recognized. cooling and flow channels 8, 9, 10. It is possible to recognize that the width of the different flow channels 8, 9, 10 is maintained substantially constant along its entire length, while the width of the fins 4, 5, 6, 7 may well vary throughout of its longitudinal extension, and areas may be formed as islands of a cooling fin which can be recognized particularly well by FIG. 4. By virtue of the different arrangement of the landing bases 3 in FIG. cooling fins and flow channels, according to which, depending on the horizontal separation distance between two landing bases, two to four cooling fins are arranged adjacent to each other, which expand and narrow in their longitudinal extension. The cooling fins have different lengths in this embodiment. This can be better recognized by the cooling fins 6a and 7a. The cooling fin 6a has a contour similar to that of a landing base 3, and is therefore substantially shorter than the adjacent cooling fin 7a. Approximately at the same height of the cooling fin 6a there are two fins 6b, 6c of additional cooling whose overall contour corresponds approximately to that of the cooling fin 6a as a base, but which in the direction of flow are centrally divided, so that between the cooling fins 6b, 6c there is a flow channel . Farther to the left, a cooling fin 6d is seen in the plane of the figure as a substantially narrower landing base. The exact contour of the respective cooling fins and of the respective flow channels is a product of the technical flow requirements and is individually adapted to the respective mold plate, that is to say substantially to the arrangement of the landing bases 3. In the plane of the right figure it can be recognized that two landing bases 3 which are one after the other in the direction of flow, ie in the vertical direction, are joined by a cooling fin 11 which extends in the direction flow. Reference symbols 1 Chill plate Chill plate 2 Coolant side of 1 3 Landing base 4 Cooling fin 5 Cooling fin 6 Cooling fin 6a Cooling fin 6b Cooling fin 6c Cooling fin 6d Cooling fin 7 Cooling fin 7a Cooling fin 8 Flow channel 9 Flow channel 10 Flow channel 11 Cooling fin H Horizontal distance between 3 Hl Horizontal row H2 Horizontal row H3 Horizontal row H4 Horizontal row S Flow direction V Vertical row Please note that in relation to this date, the best method known by the applicant to carry out the aforementioned invention is that which is clear from the present description of the invention.