RU2015794C1 - Apparatus for continuous casting - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: apparatus has a crystallizer in the form of endless flexible belt with filters and vacuum valves, a drive of the crystallizer, a bunker to feed sand on the crystallizer, a roll of synthetic film, a roll with patterns to form cavities in sand and to cover sand surface with the film, a vacuum system. Apparatus has an additional roll for sand forming and film covering. The roll with patterns is movable and has mechanism of movement. The additional roll may be mounted stationary in front of the roll with patterns. The latter is capable to be vertically moved by a lift. It is possible to make both rolls movable to exercise alternate formation. In the case mechanism of movement is made as a driven turning frame, on which shafts of the rolls are fixed. Use of two movable rolls with patterns in case of their alternate use for formation makes it possible to produce two types of profile alternatively. Use of one of the rolls without pattern makes it possible to form only flat style on surface of crystallizer facing at the time, that the second roll with ring shaped pattern is forming "continuous" cavity, that during the roll lifting will be cut by formation of a transverse partition with flat style , on which the auxiliary roll without a pattern covers the film. Design of the apparatus with horizontal location of the crystallizer makes it possible to form in its sand facing and to cast thick walled ingots (profiles), separated by transverse partitions, that significantly expands its manufacturing capabilities and does not require profile cutting for uniform length pieces. EFFECT: apparatus design expands its manufacturing capabilities significantly. 3 cl, 4 dwg

Description

 The invention relates to foundry, namely to continuous casting.

 A known installation for continuous casting, containing a mold in the form of an endless flexible tape with filters and vacuum valves, a hopper for filling sand, a roll of synthetic film, a roll with models for molding cavities in the sand and applying a film to the sand surface and a vacuum wire system (prototype) .

 However, only thin-walled castings of the strip type can be obtained by continuous casting at this installation, when the mold is installed with a slope downward in the direction of its movement. To obtain profiles with a thickness of 20-30 mm, the process is low-productivity, since metal pouring should be carried out so as not to damage the roll with models and not to pour metal through the edges of the cavity or hardened profile at a relatively low solidification rate of the metal in the sand mold of the mold. It is not possible to obtain long-length casting profiles with a thickness higher than that indicated on the installation. In addition, with continuous casting, it is often necessary to cut the casting into measured lengths, which is performed by an additionally installed device.

 The aim of the invention is the expansion of technological capabilities.

 This goal is achieved by the fact that the proposed installation is equipped with an additional roll, the roll with models is made with the possibility of movement and has a movement mechanism. An additional roll can be installed motionless in front of the roll with models, and the latter can be moved vertically with a lift.

 In another particular case, for the purpose of alternately molding, both rolls are made with the possibility of movement, and the movement mechanism is made in the form of a drive rotary frame on which the axis of the rolls are fixed.

 These new features serve the purpose, since the use of two movable rolls with models when they are alternately used for molding will allow you to get two types of profiles in turn; the use of one of the rolls without models will only allow forming a flat lad on the surface of the mold lining, while the second roll with a ring model forms a “continuous” cavity, which, when lifting the last roll, will be “interrupted” by the formation of a transverse partition with a flat lad, onto which an additional roll without a model, lay the film. The design of the installation with horizontal placement of the mold will allow molding in its sand lining and casting thick-walled castings (profiles) separated by sand walls, which greatly expands its technological capabilities, does not require cutting the profile into measured lengths.

 In FIG. 1 shows a sectional diagram of an installation; figure 2 is a diagram of a molding device, an option with two rolls mounted on the frame when forming the cavity; figure 3 is the same when forming the septum; figure 4 is the same when molding cavities of two types.

 The installation has a crystallizer in the form of a flexible tape 1 with vacuum valves 2 and filters 3. For feeding sand 4 there is a hopper 5. The roller 6 is used to deposit a film 7 from a roll 8 on the surface of the sand.

 A roll 10 is installed on the elevator 9 with models for molding cavities 11, which are poured from the bucket 12, hardened castings 13 are removed using a roller table 14. The mold drive 15, the vacuum wire system 16 are shown in Fig. 1.

 In another embodiment, an additional roll 6 without models and a roll 10 with models are mounted on the frame 17, which, thanks to the drive 18 from the mechanism 19, has the ability to rotate around an axis parallel to the axes of the rolls and occupy the positions shown in figures 2 and 3.

 In addition, figure 4 shows an option when two rolls 10 and 20 with different models are fixed on the frame for alternately molding different cavities corresponding to the models.

 Installation work. Similarly to the prototype installation, sand 4 from a hopper 5 is poured onto a flexible tape 1 with vacuum valves 2 and filters 3, however, instead of one roll, two rolls 6 and 10 are used to apply a film 7 from a roll 8 and form a cavity 11. The axis of the roll 6 (FIG. 1) without models, it is fixed motionless, and the sand is aligned with the roll, in which the cavity 11 of the required length is formed by the ring model of the roll 10. Stop forming the cavity 11 by raising the roll 10 with the elevator 9, after which only a smooth lad is formed by the roll 6 and a partition is obtained between the cavities, then the roll 10 is again lowered and a second cavity of the required length is obtained, etc. Cavities are poured from the bucket 12. After hardening, the castings 13 are removed by the roller table 14. The belt 1 is moved by the drive 15 and vacuum through a system of 16 pipelines.

 Vacuum sanding of the cladding by the method of vacuum-film molding through the valves 2 and filters 3 is carried out at a distance of about 0.5-1.0 m from the place of molding, where the sand has lower strength than near vacuum filters 3, due to difficult air filtration between grains of fine-grained sand and a decrease in the amount of rarefaction as a result. The reduced strength of the cladding sand facilitates molding, since it allows the sand to be compacted when the sand layer is deformed by the roll model, and its excess displaced towards the hopper 5, where the sand is not sealed by the differential pressure (atmospheric and intraform). In this case, for forming deep cavities 11, the design options shown in FIGS. 2-4, preferably shown in FIG. 1, since a fixed roller 6 can make it difficult to displace sand towards the hopper during molding. In addition, the lining of high ring models is more convenient to produce when applying the film 7 to the roller 10 until the contact of the latter with sand, as shown in Fig.2-4.

 In Fig.2,3 shows a diagram of the molding process in turn by rollers 6 and 10, and in Fig.4 - rollers 10 and 20, placed on the frame 17, which is rotated by the drive 18 from the mechanism 19 and set so as to obtain a cavity 11 (Fig. 2) or the partition between the cavities (figure 3), or two different cavities obtained from different models of two rolls 10 and 20.

 When using the proposed installation with a horizontally placed mold, lengthy cavities of the casting-profile are obtained in the cladding compacted by the VPF method, applying vacuum (60 ± 40) kPa to the thickness of the sand. For example, a roll with a diameter of about 0.5 m can produce rectangular profiles with a length of 10 m and a profile cross section of 0.3 x 0.3 m, which greatly expands the technological capabilities of the prototype installation.

Claims (3)

 1. INSTALLATION FOR CONTINUOUS CASTING, containing a mold in the form of an endless flexible strip lined with refractory sand, and a mold conveying drive, characterized in that, in order to expand technological capabilities, it is equipped with a hopper for filling sand onto the mold, a roll of synthetic film, two rolls with models for molding cavities in the sand and applying a film to the surface of the sand, and the second roll along with the mold is installed with the possibility of movement by mechanism, filters with vacuum valves and a vacuum pipe system, while filters with vacuum valves are placed in a flexible tape.  2. Installation according to claim 1, characterized in that the movable roll with the models is mounted with the possibility of vertical movement relative to the motionlessly installed first roll, and the mechanism for its movement is made in the form of a hoist.  3. Installation according to claim 1, characterized in that, in order to ensure alternate molding, the first roll is mounted with the possibility of movement, and their movement mechanisms are a drive rotary frame on which the axis of the rolls are fixed.

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