RU2136436C1 - Plant for production of continuously cast deformed castings - Google Patents

Abstract

FIELD: continuous casting of metals. SUBSTANCE: plant has assembled water-cooled mold from two pairs of working walls. The first pair of walls is made with expanded upper and vertical lower sections of working surface with synchronous drive of their motion. Walls of the second pair are made for execution of reciprocating motion. Ingot supporting system has a pair of rollers additionally installed under mold only on the side of pair of working walls executing reciprocating motion. Said pair of rollers is installed at distance S from mold outlet. S=(5-7)B, where B is width of deformed casting. Distance between working surfaces of two rollers is selected from interval B-2R < L < B, where B is roller radius. Rollers are installed on springs with respect to each other, and distance between working surfaces of two rollers is found from relation L=B-(0.3- 0.7)R. Rollers radius-casting width ratio is 0.25-1.45. EFFECT: increased production efficiency of casting and higher quality of casting surface. 2 cl, 3 dwg

Description

 The invention relates to continuous casting of metals, and in particular to the design of installations for continuous casting and deformation of workpieces.

 Widely known prefabricated water-cooled molds of continuous metal casting machines, consisting of four arranged in pairs of longitudinal working walls [1. Continuous steel casting. Popandopulo I.K., Mikhnevich Yu.F. M.: Metallurgy, 1990, - See p. 110].

 The disadvantage of prefabricated slip crystallizers [1] is that in the workpieces at the exit from them contains a liquid phase, leading to buckling of the shell.

 A device for continuous casting [2. Patent N 2041011 RU, B 22 D 11/04. Device for continuous casting of blanks / V.I. Lonely. Publ. 08/09/95. Bull. N 22], comprising a prefabricated mold, consisting of four longitudinally spaced longitudinal working walls, the first pair of working walls made with extended upper and vertical lower sections of the working surface with a synchronous drive for their movement, and each of the working walls of the second pair is made with the possibility of phase-shifted to the first pair of reciprocating motion.

 A disadvantage of the device for continuous casting of blanks [2] is a possible rupture of the metal at the exit of the mold. An increase in the cross section of the cast billets increases the likelihood of breakage of the billets.

 Known support system of the ingot in the secondary cooling zone, consisting of rollers that are located across the width of the ingot and cooling devices [1. see page 133].

 The disadvantages of the supporting system of ingots [1] are that the location of the rollers along the width of the ingots leads to deformation of the surface of the profile blanks and their transfer, in some cases, to marriage. In addition, the well-known system for maintaining ingots is used mainly to prevent buckling of the metal under the action of the ferrostatic pressure of the melt under the slip mold. The use of the support ingot system [1] is ineffective when the liquid phase does not penetrate with the ingot beyond the mold.

 The inventive installation for producing continuously cast deformed billets is aimed at creating a highly efficient metal casting process.

The technical result obtained by the implementation of the inventive installation is:
1. Improving the performance of the metal casting process.

 2. Improving the surface quality of the workpieces.

 The proposed installation is characterized by the following essential features.

 Limiting signs: prefabricated water-cooled crystallizer having one pair of working walls with expanded upper and vertical lower sections of the working surface with a synchronous drive for moving them and another pair of working walls with the possibility of making a phase-shifted relative to the first pair of working walls of the reciprocating mold movement supporting system of workpieces in the secondary cooling zone, having rollers and devices for cooling them.

 Distinctive features: pairs of rollers are installed under the mold only from the side of the pair of working walls making reciprocating movements, at a distance S from the exit from the mold equal to S = (5-7) • b, where b is the width of continuously cast deformed billets; the distance between the working surfaces of the two rollers "L" is selected from the following interval b-2R <L <b, where R is the radius of the roller; the rollers are mounted relative to each other on the springs; the distance between the working surfaces of the two rollers is found from the following ratio L = b- (0.3-0.7) R; the ratio of the radius of the roller to the width of the workpiece lies within R / b = (0.25-0.45).

 A causal relationship between the set of essential features of the claimed installation and the achieved technical result is as follows.

 The installation of rollers under the mold only from the side of a pair of working walls that perform reciprocating movements eliminates damage to the surface of the profile workpiece formed on the working surface of the walls of the first pair of mold. In addition, the installation of the rollers from the side of a pair of working walls, making reciprocating movements, allows more widely to adjust the distance between the axes of the rollers and their diameter to obtain a high-quality workpiece.

 The installation of the rollers at a distance S <5 • b, where b is the width of the continuous molded deformed workpieces from the exit from the mold, on the one hand, complicates the maintenance and repair of the mold, and on the other hand, leads to more intense heating of the rollers and the need for additional cooling. In addition, the installation of rollers at a distance S <5 • b from the exit from the mold increases the likelihood of deformation of the workpiece by the rollers.

 The installation of rollers at a distance S> 7 • b from the exit from the mold leads to the breakage of the workpieces, in particular due to an increase in the temperature of the cast metal and insufficient thickness of the crusts of the workpiece on the surfaces of the working walls of the first pair.

 Reducing the distance "L" between the working surfaces of the two rollers L≤b-2R (where R is the radius of the roller) leads to the fact that the rollers do not scroll and the workpiece does not move after it enters the supporting system.

 When L≥b, the workpiece is not held by the rollers on the side of a pair of working walls that make reciprocating movements, and breaks off after they pass.

The installation of the rollers relative to each other on the springs allows you to adjust the distance between them and the compression force of the workpiece,
The increase in the distance between the working surfaces of the rollers when setting them L> (b-0,3 • R) leads to the need to increase the rigidity of the supporting system due to the increased compression force of the springs.

 Reducing the distance between the working surface of the rollers when setting them L <(b-0.7R) leads to an increase in the effort to unclench the springs and scroll the rollers. In addition, the resistance to ejection of the workpiece by the walls of the second pair increases significantly, which leads to a decrease in the productivity of the installation and an increase in the energy consumption for driving the walls of the mold.

 A decrease in the ratio of the radius of the roller and the width of the workpiece R / b <0.25 leads to a quick heating of the surface of the rollers and accelerated wear. In addition, the life of the rollers is reduced due to the smaller number of possible grinding of their working surface.

 An increase in the ratio of the radius of the roller and the width of the workpiece R / b> 0.45 leads to an inefficient expenditure of metal and an increase in the complexity of manufacturing rollers.

 In FIG. 1 shows the appearance of the inventive installation with the diluted rollers for the passage of the workpiece, in FIG. 2 is a section AA in FIG. 1, in FIG. Figure 3 shows the state of the supporting system with the rollers brought together and the absence of a workpiece between them.

 The inventive apparatus of FIG. 1-3 consists of a pre-fabricated mold 1 with a first pair of working walls 2 and a second pair of working walls 3, supporting a workpiece system 4 in the secondary cooling zone, consisting of rollers 5 with axles 6, rods 7 with springs 8 and 9, nuts 10. Before by pouring molten metal into the mold 1, the support system 4 is adjusted in FIG. 3. The tightening of the nuts 10 on the rods 7 leads to compression of the springs 8 and 9 and the movement of the axles 6 with the rollers 5 towards each other. During the operation of the supporting system 4, the spring 8 is opened, and the spring 9 is further compressed.

 The operation of the claimed installation is as follows.

 The liquid metal enters the mold 1, where it solidifies and the formation of the workpiece. After reaching a certain level of filling, the drive of the walls 2 and 3, respectively, of the first and second pairs, is turned on. As a result, the walls 2 of the first pair rotate with compression of the workpiece’s crust, and the walls 3 of the second pair reciprocate with the workpiece ejected from the mold 1. The workpiece exiting the mold goes into the supporting system 4 in FIG. 3. As a result, the rollers 5 begin to rotate towards each other on the axes 6 and at the same time diverge relative to each other, passing the workpiece between them. In this case, the axis 6 moves along the rod 7, the spring 8 is unclenched and the spring 9 is compressed. Thus, breakage of the billet and its maintenance during continuous ejection of the metal from the mold 1 by the walls 3 are excluded. After the billet leaves the support system 4, the rollers 5 remain at a constant distance from each other until the end of the casting process. Cutting the workpiece into measured lengths is carried out after the supporting system. If necessary, the adjustment of the supporting system is carried out in the process of casting metal. At the end of the casting process, the rollers 5 support the tail of the workpiece and converge towards each other.

Claims (2)

 1. Installation for producing continuously cast deformed billets, comprising a prefabricated water-cooled mold, having one pair of working walls with expanded upper and vertical lower sections of the working surface with a synchronous drive for moving them and another pair of working walls with the possibility of making phase-shifted relative to the first pair working walls of the mold, reciprocating motion, supporting a workpiece system in the secondary cooling zone, having rollers and devices for their cooling waiting, characterized in that the pairs of rollers are installed under the mold only from the side of the pair of mold working walls, making reciprocating movements, at a distance S from the exit from the mold equal to S = (5 - 7) • b, where b is the width of continuously cast deformed blanks, and the distance between the working surfaces of the two rollers L is selected from the following interval (b - 2R) <L <B, where R is the radius of the roller.  2. Installation according to claim 1, characterized in that the rollers are mounted relative to each other on springs, while the distance between the working surfaces of the two rollers is found from the following ratio L = b - (0.3 - 0.7) R, and the radius ratio roller to the width of the workpiece lies in the range (0.25 - 0.45).

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