Integral sleeve structure for pouring

Abstract

The utility model discloses an integral casing pipe structure for pouring, which comprises a casing pipe main body, a pouring hole I and a pouring hole II are arranged in the casing pipe main body to form a double-hole casing pipe structure, the pouring mode during pouring is double-hole intrusive water gap pouring, and both the pouring hole I and the pouring hole II are through holes. By using the integral sleeve, nitrogen and oxygen increase of molten steel from a tundish to a crystallizer can be effectively avoided, secondary oxidation of the molten steel is reduced, and the quality of high-quality special steel products is improved. According to the technical scheme, the whole pipe is used for casting, particularly the double-hole sleeve is used for casting, so that the flowing state of molten steel injection flow can be effectively adjusted, the product quality is improved, and the casting stability can be kept in the unstable casting process.

Description

Technical Field

[0001] The utility model belongs to the technical field of casting, and in particular relates to an integral sleeve structure for casting. Background Art

[0002] At present, the basic method of traditional pouring is split casing pouring. However, with the development of high-quality and special steel production, higher requirements are placed on the protective pouring of process pouring control, and higher and higher requirements are placed on product quality, especially the control of steel inclusions. Some high-quality and special steels require the reduction of nitrogen and oxygen addition in the pouring process, and the requirements for process protective pouring are becoming more and more stringent.

[0003] The shortcomings of the prior art mainly include the following points:

[0004] 1. Limitations of split casing casting: The traditional split casing casting method has certain limitations in the production process of high-quality steel and cannot meet the requirements of protective casting for process casting control. With the development of high-quality steel production, the requirements for product quality are getting higher and higher, especially the control of steel inclusions.

[0005] 2. Nitrogen and oxygen increase problem: Some special steels require the reduction of nitrogen and oxygen increase during the pouring process. However, the split casing pouring method cannot effectively solve this problem, resulting in the continued presence of nitrogen and oxygen increase in the molten steel from the tundish to the crystallizer.

[0006] 3. Secondary oxidation problem: The split casing casting method cannot effectively prevent the secondary oxidation of molten steel. Secondary oxidation will lead to an increase in inclusions in the molten steel, thus affecting the quality of high-quality special steel products.

[0007] The shortcomings of the existing technology are mainly reflected in the limitations of the split casing casting method in the production process of high-quality steel, which cannot meet the protective casting requirements for process casting control and cannot effectively solve the problems of nitrogen addition, oxygen addition and secondary oxidation.

[0008] The utility model patent with application number CN201820467676 published on November 30, 2018 provides a GIS epoxy casing casting mold, which belongs to the technical field of casing molds. The utility model is truncated cone-shaped as a whole, including a bracket and an outer mold sleeve on the bracket, the two ends of the outer mold sleeve are respectively connected to the positioning block and the flange, the flange is provided with a fixing part, and also includes a core mold arranged in the outer mold sleeve and connected to the fixing plate, the fixing part is provided with an outer shrinkage groove, an inner shrinkage groove, a riser, a gate and a bolt sleeve, the outer shrinkage groove and the inner shrinkage groove are arranged on both sides of the bolt sleeve, and the gate and the riser are arranged on the outer shrinkage groove. However, the technical solution of the patent cannot solve the above technical problems. Utility Model Content

[0009] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an integral sleeve structure for casting which is simple in structure and easy to use. The use of the integral sleeve of the utility model can effectively prevent the increase of nitrogen and oxygen in molten steel from the tundish to the crystallizer, and reduce the secondary oxidation of molten steel.

[0010] To achieve the above-mentioned purpose, the technical solution of the utility model is: an integral casing structure for casting, including a casing body, in which a pouring hole I and a pouring hole II are provided to form a double-hole casing structure. When casting, the pouring method is double-hole invasive water nozzle casting, and the pouring hole I and the pouring hole II are both through holes.

[0011] Furthermore, the outlet ends of the pouring hole I and the pouring hole II are both expanded holes, and the shapes of the outlet ends of the pouring hole I and the pouring hole II are both semicircular arcs.

[0012] Furthermore, the pouring hole I and the pouring hole II are arranged side by side in the casing body, and the pouring hole I and the pouring hole II are parallel to each other.

[0013] Furthermore, the upper portion of the sleeve body is a conical structure, the middle portion and the lower portion of the sleeve body are both cylindrical structures of equal diameter, and the pouring hole I and the pouring hole II are both holes of equal diameter.

[0014] Furthermore, the diameter of the pouring hole I is equal to the diameter of the pouring hole II.

[0015] Furthermore, the inlet ends of the pouring holes I and II are also expanded hole structures, and the diameter of the expanded hole at the inlet end is greater than the diameter of the expanded hole at the outlet end.

[0016] Furthermore, the integral sleeve structure also includes stopper rods of various specifications and sizes, which are inserted into opening holes I and II. When the integral sleeve is poured, stopper rods of different sizes are used in conjunction with opening holes I and II to control the opening degrees of opening holes I and II, thereby independently controlling the flow rate and direction of the molten steel in opening holes I and II, stabilizing the injection flow, and improving the flow state of the molten steel entering the crystallizer.

[0017] The advantages of adopting the technical solution of the utility model are:

[0018] The use of the integral sleeve of the utility model can effectively prevent the increase of nitrogen and oxygen in the molten steel from the tundish to the crystallizer, reduce the secondary oxidation of the molten steel, and improve the quality of high-quality special steel products. The integral pipe opening, especially the double-hole sleeve opening, can not only effectively adjust the flow state of the molten steel injection and improve the product quality, but also maintain the stability of the pouring in the non-steady-state pouring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of the internal structure of the integral casing of the utility model;

[0021] Figure 2 It is a partial enlarged schematic diagram of the outlet end of the integral sleeve of the utility model.

[0022] The markings in the above figure are: 1. casing body; 2. pouring hole I; 3. pouring hole II; 4. outlet end; 5. inlet end. DETAILED DESCRIPTION

[0023] In the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential", etc., which indicate orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation; be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0024] like Figure 1 , Figure 2 As shown, a whole casing structure for casting includes a casing body 1, and a casting hole Ⅰ2 and a casting hole Ⅱ3 are provided in the casing body 1 to form a double-hole casing structure. When casting, the casting method is double-hole invasive water gate casting, and the casting hole Ⅰ2 and the casting hole Ⅱ3 are both through holes. The use of the whole casing of the utility model can effectively prevent the increase of nitrogen and oxygen in the molten steel from the tundish to the crystallizer, reduce the secondary oxidation of the molten steel, and improve the quality of high-quality special steel products. The whole pipe casting, especially the double-hole casing casting, can not only effectively adjust the flow state of the molten steel injection and improve the product quality, but also maintain the stability of the casting during the non-steady-state casting process.

[0025] The outlet ends 4 of the pouring holes Ⅰ2 and Ⅱ3 are both expanded holes, and the shapes of the outlet ends of the pouring holes Ⅰ2 and Ⅱ3 are both semicircular. The inlet ends 5 of the pouring holes Ⅰ2 and Ⅱ3 are also expanded hole structures, and the diameter of the expanded hole at the inlet end 5 is greater than the diameter of the expanded hole at the outlet end 4. The utility model expands the bowl of the intrusive water inlet to allow the two streams to flow simultaneously, thereby reducing and lowering the blockage of the water inlet; the semicircular arc shape of the lower mouth of the double-hole intrusive water inlet can effectively reduce the buffering force and reduce the fluctuation of the liquid level.

[0026] The pouring holes Ⅰ2 and Ⅱ3 are arranged in parallel in the casing body 1, and the pouring holes Ⅰ2 and Ⅱ3 are parallel to each other. The upper part of the casing body 1 is a conical structure, and the middle and lower parts of the casing body 1 are both equal-diameter cylindrical structures, and the pouring holes Ⅰ2 and Ⅱ3 are both equal-diameter holes. The diameter of the pouring hole Ⅰ2 is equal to the diameter of the pouring hole Ⅱ3.

[0027] The integral casing structure also includes stopper rods of various specifications and sizes, which are inserted into opening holes Ⅰ2 and Ⅱ3. When the integral casing is poured, stopper rods of different sizes are used in conjunction with opening holes Ⅰ2 and Ⅱ3 to control the opening degrees of opening holes Ⅰ2 and Ⅱ3, thereby independently controlling the flow rate and direction of the molten steel in opening holes Ⅰ2 and Ⅱ3, stabilizing the injection flow, and improving the flow state of the molten steel entering the crystallizer.

[0028] By controlling the flow rate and direction of molten steel in opening pouring hole Ⅰ2 and opening pouring hole Ⅱ3, the injection movement should be able to gently and evenly flush the solidification front; reduce the impact depth of the injection flow without causing strong turbulence of the liquid surface in the crystallizer; always maintain the high temperature of the liquid surface in the crystallizer; improve the flow state and heat flow distribution of the injection flow in the crystallizer, and promote faster and more uniform growth of the shell in the crystallizer.

[0029] The utility model aims at changing the current pouring method: single-hole intrusive water nozzle pouring to double-hole intrusive water nozzle pouring, which can effectively adjust the flow state of molten steel injection.

[0030] The integral tube casting, especially the double-hole casing casting, has the function of adjusting the flow state of the molten steel injection. During the casting process, by independently controlling the flow rate of the molten steel in each hole, the flow rate and direction of the molten steel can be effectively adjusted and controlled to optimize the flow state of the molten steel in the crystallizer.

[0031] At the end of pouring, when the tundish liquid level drops to a critical height, a vortex may form above the nozzle, which may draw slag into the crystallizer. At the same time, the tundish injection flow is unstable, which may stir the flow of molten steel in the crystallizer. At this time, by taking advantage of the integral pipe pouring, especially the double-hole casing pouring, the flow rate and direction of the molten steel can be more effectively controlled, the injection flow can be stabilized, the slag can be prevented from being drawn into the molten steel, and the product quality can be improved.

[0032] In addition, the pouring process is a non-steady-state process. For example, during the tundish pouring, quick-change immersion nozzle, before and after the ladle change, and the end of pouring, the molten steel level fluctuates greatly and the casting speed changes frequently. At these moments, the integral pipe pouring can also effectively adjust the flow state of the molten steel and ensure the stability of the pouring. The integral pipe pouring, especially the double-hole casing pouring, can not only effectively adjust the flow state of the molten steel injection and improve the product quality, but also maintain the stability of the pouring during the non-steady-state pouring process.

[0033] The utility model uses a double-hole intrusive water nozzle for pouring during the pouring process, and can expand the bowl of the intrusive water nozzle to allow two streams to flow simultaneously, thereby reducing and lowering the blockage of the water nozzle; using the double-hole injection flow during the injection process can significantly improve the flow state of molten steel entering the crystallizer; the semicircular arc shape of the lower mouth of the double-hole intrusive water nozzle can effectively reduce the buffering force and reduce the liquid level fluctuation; the double-hole intrusive water nozzle injection crystallizer can effectively improve the heat flow distribution, so that the growth rate of the billet shell is accelerated and uniform.

[0034] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An integral casing structure for casting, characterized in that: The invention comprises a casing body (1), wherein a pouring hole I (2) and a pouring hole II (3) are arranged in the casing body (1) to form a double-hole casing structure. When pouring, the pouring method is double-hole invasive water nozzle pouring, and the pouring hole I (2) and the pouring hole II (3) are both through holes.

2. The integral casing structure for pouring as claimed in claim 1, characterized in that: The outlet ends (4) of the pouring holes Ⅰ (2) and Ⅱ (3) are both expanded holes, and the shapes of the outlet ends of the pouring holes Ⅰ (2) and Ⅱ (3) are both semicircular arcs.

3. A casting integral sleeve structure as claimed in claim 1 or 2, characterized in that: The pouring hole I (2) and the pouring hole II (3) are arranged side by side in the sleeve body (1), and the pouring hole I (2) and the pouring hole II (3) are parallel to each other.

4. The integral casing structure for pouring as claimed in claim 3, characterized in that: The upper part of the sleeve body (1) is a conical structure, the middle part and the lower part of the sleeve body (1) are both cylindrical structures with equal diameters, and the pouring hole I (2) and the pouring hole II (3) are both holes with equal diameters.

5. The integral casing structure for pouring as claimed in claim 4, characterized in that: The diameter of the pouring hole I (2) is equal to the diameter of the pouring hole II (3).

6. The integral casing structure for pouring as claimed in claim 4, characterized in that: The inlet ends (5) of the pouring holes I (2) and II (3) are also expanded hole structures, and the diameter of the expanded hole at the inlet end (5) is larger than the diameter of the expanded hole at the outlet end (4).

7. The integral casing structure for pouring as claimed in claim 5, characterized in that: The integral sleeve structure also includes stopper rods of various specifications and sizes, which are inserted into the opening holes Ⅰ(2) and Ⅱ(3). When the integral sleeve is poured, the stopper rods of different sizes are used in conjunction with the opening holes Ⅰ(2) and Ⅱ(3) to control the openings of the opening holes Ⅰ(2) and Ⅱ(3), thereby independently controlling the flow rate and flow direction of the molten steel in the opening holes Ⅰ(2) and Ⅱ(3), stabilizing the injection flow, and improving the flow state of the molten steel entering the crystallizer.

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