Master alloy ingot casting riser

Abstract

The utility model discloses a mother alloy ingot casting riser which comprises an upper riser and a lower riser, the upper riser is of a regular prism structure, the lower riser is of a cylindrical structure, the outer diameter of the lower riser is the same as the inner diameter of a die pipe, the plane size of the upper riser is larger than that of the lower riser, an inner cavity is formed in the riser, and the inner cavity and the lower riser are coaxially arranged. The diameter of the inner cavity is sequentially increased from top to bottom, and a notch communicated with the inner cavity is formed in the upper surface of the upper riser; by adopting the combined structure of the upper riser and the lower riser, the mounting stability of the risers is improved, a metal liquid column is ensured to be positioned in the center of the die pipe, the pouring spatter is reduced, enough liquid metal is fed when a cast ingot is solidified and shrunk, the one-time shrinkage depth is obviously reduced, and the production efficiency is improved. The ladder-shaped inner cavity not only ensures the strength of the riser, but also compensates the liquid metal loss caused by the notch part of the riser, ensures that enough liquid metal is used for feeding cast ingots, improves the product yield, and reduces the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of preparation of master alloy ingots, in particular to a pouring riser for master alloy ingots. Background Art

[0002] During the solidification process of casting alloys, due to the liquid shrinkage and solidification shrinkage of the metal, large and concentrated holes appear in the last solidified part of the ingot, which are called shrinkage holes. The shrinkage holes of the master alloy ingot include primary shrinkage holes and secondary shrinkage holes. The primary shrinkage holes appear at the top center of the ingot, which are exposed or closed larger "V"-shaped holes. There are three stages in the solidification shrinkage process of the ingot, namely: liquid shrinkage stage, solidification shrinkage stage, and solid shrinkage stage. Liquid shrinkage and solidification shrinkage are the basic reasons for the formation of shrinkage holes. The shrinkage volume of the alloy ingot is related to the liquid shrinkage coefficient of the metal, the solidification shrinkage rate, the solid shrinkage rate, the chilling ability of the mold, the pouring temperature, the pouring speed, and the diameter of the ingot.

[0003] The greater the liquid shrinkage coefficient or solidification shrinkage rate of the alloy, the larger the shrinkage cavity volume; the greater the solid-state shrinkage rate of the alloy, the smaller the shrinkage cavity volume; the greater the cooling ability of the mold, that is, the greater the heat storage coefficient K, the smaller the shrinkage cavity volume; the higher the pouring temperature, the greater the liquid shrinkage of the alloy and the larger the shrinkage cavity volume; the slower the pouring speed, that is, the longer the pouring time, the smaller the shrinkage cavity volume; the larger the ingot diameter, after the surface solidifies, the higher the temperature of the internal molten metal, the greater the liquid shrinkage and the larger the shrinkage cavity volume.

[0004] For an alloy of a certain material, its liquid shrinkage coefficient, solidification shrinkage rate, and solid shrinkage rate are also determined. In theory, the shrinkage volume of the ingot can only be reduced by selecting a suitable casting mold, alloy pouring temperature, and pouring speed.

[0005] In the actual production of ingots, taking into account factors such as the tundish and the mold, a "bowl-shaped" riser is placed above the mold during pouring, so that the ingot solidifies sequentially when shrinking, that is, the riser part solidifies last, thereby reducing the size and depth of the primary shrinkage cavity.

[0006] The disadvantages of the existing "bowl-shaped" riser are: 1. Under vacuum, when pouring the tundish, it is not easy to observe whether the metal liquid column is in the center of the mold tube from the side observation hole, and it is easy to cause metal splashing and affect the product quality of the ingot; 2. After the ingot is poured, the liquid metal required for solidification and shrinkage is insufficient, and the primary shrinkage cavity is deep. In order to ensure that the shrinkage cavity of the ingot meets customer requirements, it is necessary to cut off the primary shrinkage cavity. Under the design of the existing riser, it is necessary to cut off the deeper primary shrinkage cavity, which increases the production cost and reduces the product yield. In view of the shortcomings of the above-mentioned existing risers, this application proposes a mother alloy ingot casting riser to solve the shortcomings of the above-mentioned existing risers. Utility Model Content

[0007] The main purpose of the utility model is to provide a mother alloy ingot pouring riser, which can effectively solve the problems in the background technology.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is: a mother alloy ingot casting riser, the riser includes an upper riser and a lower riser, the upper riser is a regular prism structure, the lower riser is a cylindrical structure, the outer diameter of the lower riser is the same as the inner diameter of the mold tube, the plane size of the upper riser is larger than the plane size of the lower riser, an inner cavity is arranged in the riser, the inner cavity is coaxially arranged with the lower riser, the inner cavity is stepped and the diameter increases successively from top to bottom, and the upper surface of the upper riser is provided with a notch connected to the inner cavity.

[0009] Preferably, the upper riser is a regular quadrangular prism structure.

[0010] Preferably, the side length of the upper riser is not less than the outer diameter of the mold tube.

[0011] Preferably, the upper riser is provided with a first inner cavity and a second inner cavity in sequence from top to bottom, and the lower riser is provided with a third inner cavity, the diameter of the first inner cavity is smaller than the diameter of the second inner cavity, and the diameter of the second inner cavity is smaller than the diameter of the third inner cavity.

[0012] Preferably, the first inner cavity and the second inner cavity, as well as the second inner cavity and the third inner cavity are smoothly connected.

[0013] Preferably, central axes of the first inner cavity, the second inner cavity and the third inner cavity are on the same straight line.

[0014] Preferably, the notch has a depth of 15 mm and a width of 25 mm.

[0015] Preferably, the number of the notches is two and the two notches are symmetrically arranged.

[0016] Preferably, the center line of the notch and the axial center line of the inner cavity are in the same plane.

[0017] Compared with the traditional technology, the beneficial effects produced by the utility model are as follows: the utility model adopts a combined structure of an upper riser and a lower riser. When the riser is assembled with the mold tube, the lower riser can be just inserted into the mold tube, thereby improving the stability of the riser installation and ensuring that the metal liquid column is in the center of the mold tube. The groove arranged on the surface of the upper riser is connected with the inner cavity, and the liquid column flows along the groove to the next riser, reducing pouring splashes, and sufficient liquid metal flows into adjacent risers during the entire pouring process. When the ingot shrinks during solidification, there is sufficient liquid metal to compensate for the shrinkage, and the depth of the shrinkage cavity is significantly reduced. The stepped inner cavity not only ensures the strength of the riser but also compensates for the loss of liquid metal caused by the notch of the riser, ensuring that there is sufficient liquid metal to compensate for the shrinkage of the ingot, thereby improving the product yield and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0020] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0021] Figure 3 It is a schematic diagram of the use of the riser of the utility model.

[0022] The markings in the figure are as follows:

[0023] 1. Upper riser; 2. Lower riser; 3. Notch; 4. First inner cavity; 5. Second inner cavity; 6. Third inner cavity. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1-3 , a mother alloy ingot casting riser is provided, the riser comprises an upper riser 1 and a lower riser 2, the upper riser 1 is a regular prism structure, the lower riser 2 is a cylindrical structure, the outer diameter of the lower riser 2 is the same as the inner diameter of the mold tube, the plane size of the upper riser 1 is larger than the plane size of the lower riser 2, an inner cavity is arranged in the riser, the inner cavity is coaxially arranged with the lower riser 2, the inner cavity is stepped and the diameter increases from top to bottom, and a notch 3 communicating with the inner cavity is provided on the upper surface of the upper riser 1.

[0027] In this example, the upper riser 1 is a regular tetrahedral prism structure. Furthermore, the upper riser 1 is a cube structure. The side length of the upper riser 1 is not less than the outer diameter of the mold tube. Preferably, the side length of the upper riser 1 is the same as the outer diameter of the mold tube. When the ingots are batch-cast, the mold tube matrix is ​​distributed in the sand box, the lower riser 2 is inserted into the mold tube, and the adjacent upper risers 1 are fitted together so that the slots 3 on the adjacent upper risers 1 are connected. The plane on which the upper riser 1 is set is set to a square. In the molding process, it is convenient to align the slots 3 on the upper riser 1. The depth of the slot 3 is 15 mm and the width is 25 mm. The slot 3 is set to two and the two slots 3 are symmetrically arranged. The center line of the slot 3 is on the same plane as the axial center line of the inner cavity. During pouring, the mold car moves, and the liquid column flows along the slot 3 to the next riser, reducing pouring splashes.

[0028] When making the mold, a mold tube without a riser can be placed on the left side of the casting mold tube under the 1# riser (left), which is used for aligning the tundish and pouring the molten metal that flows through the tundish for the first time; when the 2# riser (middle) is filled, the excess molten metal will flow to the 1# and 3# risers (right). Therefore, when the 1# riser shrinks during solidification, the liquid level drops. The excess molten metal from the 2# riser will, on the one hand, compensate for the shrinkage of the 1# riser, and on the other hand, it will flow into the 3# riser casting mold, saving costs and reducing losses.

[0029] In the design of the inner cavity structure of the riser, the upper riser 1 is provided with the first inner cavity 4 and the second inner cavity 5 which are interconnected from top to bottom, and the lower riser 2 is provided with the third inner cavity 6. The diameter of the first inner cavity 4 is smaller than the diameter of the second inner cavity 5, and the diameter of the second inner cavity 5 is smaller than the diameter of the third inner cavity 6, forming a stepped inner cavity with decreasing diameter from top to bottom, and the first inner cavity 4 and the second inner cavity 5 as well as the second inner cavity 5 and the third inner cavity 6 are smoothly connected, and the central axis of the first inner cavity 4, the second inner cavity 5 and the third inner cavity 6 are on the same straight line. On the one hand, the strength required for the riser during the installation process can be guaranteed; on the other hand, since a notch 3 is opened above the riser to reduce the actual metal liquid volume of the riser, the stepped design of the inner cavity can compensate the metal loss caused by the gap at the upper end of the riser to the maximum extent.

[0030] In this case, due to the influence of the vacuum melting equipment for melting the master alloy, the ingot of the master alloy plant is about 1000mm, the casting mold tube is low carbon steel (ZG20), the wall thickness is generally 12-18mm, and during pouring, the alloy liquid first enters the tundish from the furnace mouth of the induction furnace, the diameter of the casting mouth is generally 11-14mm, and the tundish adopts continuous pouring to continuously inject molten metal into different risers. Melting and pouring are both carried out in a vacuum environment; the tundish enters the pouring chamber and is fixed, and the mold tube is poured in turn by a mobile mold car; the ingot solidifies and shrinks during the entire pouring process, and there is enough liquid metal to reduce shrinkage holes during shrinkage.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A mother alloy ingot casting riser, the riser comprising an upper riser and a lower riser, characterized in that: The upper riser is a regular prism structure, and the lower riser is a cylindrical structure. The outer diameter of the lower riser is the same as the inner diameter of the mold tube. The plane size of the upper riser is larger than the plane size of the lower riser. An inner cavity is arranged in the riser, and the inner cavity is coaxially arranged with the lower riser. The inner cavity is stepped and the diameter increases from top to bottom. The upper surface of the upper riser is provided with a notch connected to the inner cavity.

2. A mother alloy ingot pouring riser according to claim 1, characterized in that: The upper riser is a regular quadrangular prism structure.

3. A mother alloy ingot pouring riser according to claim 2, characterized in that: The side length of the upper riser is not less than the outer diameter of the mold tube.

4. A mother alloy ingot pouring riser according to claim 1, characterized in that: The upper riser is provided with a first inner cavity and a second inner cavity in sequence from top to bottom, and the lower riser is provided with a third inner cavity. The diameter of the first inner cavity is smaller than the diameter of the second inner cavity, and the diameter of the second inner cavity is smaller than the diameter of the third inner cavity.

5. A mother alloy ingot pouring riser according to claim 4, characterized in that: The first inner cavity and the second inner cavity as well as the second inner cavity and the third inner cavity are smoothly connected.

6. A mother alloy ingot pouring riser according to claim 4, characterized in that: Central axes of the first inner cavity, the second inner cavity and the third inner cavity are on the same straight line.

7. A mother alloy ingot pouring riser according to claim 1, characterized in that: The depth of the notch is 15 mm and the width is 25 mm.

8. A mother alloy ingot pouring riser according to claim 7, characterized in that: The number of the notches is two and the two notches are symmetrically arranged.

9. A mother alloy ingot pouring riser according to claim 8, characterized in that: The center line of the notch and the axial center line of the inner cavity are in the same plane.

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