Turbine shell casting mould

Abstract

The utility model belongs to the technical field of precoated sand casting, and discloses a turbine shell casting mould which comprises product parts, the air inlet flange ends of the product parts face upwards, the rotor connecting flange ends of the product parts face outwards, the four product parts are divided into two groups, and the air outlet ends of each group of product parts are opposite and are connected together through a central riser. The two product parts are arranged in a central symmetry mode, a straight pouring gate is vertically arranged at the central symmetry point of the two product parts, and transverse pouring gates are arranged at the bottoms of the two product parts in an extending mode towards the two sides. Through rotary arrangement of the multiple product parts, the number of feeding heads is reduced as much as possible, the sprue is arranged in the center of the product parts, the bottom of the sprue extends towards the two sides to be provided with the cross gates, and the mold filling time is shortened by improving the sizes of the sprue and the cross gates; the exothermic risers are independently arranged at the thick and large parts of the product for feeding, so that the product has better feeding performance, the product quality requirements of customers are met, and the product can be smoothly and stably produced.

Description

Technical Field

[0001] The present application relates to the technical field of coated sand casting, and more specifically, to a turbine casing casting mold. Background Art

[0002] Existing turbine shell products are made of ordinary materials and simple shapes. Therefore, most foundries use manual molding methods for such products, using wooden molds or aluminum alloy molds, and using clay sand for manual filling, compaction, demoulding, and box closing. In this process, high-power electric furnaces are used to smelt molten iron. In order to reduce production costs and improve production efficiency, casting is often carried out at a temperature close to the limit state, and risers and other processes are used as little as possible.

[0003] The company currently produces a turbine shell product, such as Figure 4 As shown in the figure, the product has an air inlet flange end, an air outlet end and a rotor connection flange end, and has several mounting bosses on its side wall. The interior is a turbine-shaped exhaust duct, which makes it difficult to dissipate heat during casting. The product wall thickness is 4mm, which is thinner than ordinary turbine shell products, and the difference with the wall thickness of the boss is greater, making it impossible to uniformly and synchronously fill and solidify. In addition, its material is heat-resistant steel, and its performance is similar to that of steel, but compared with common steel materials, the product has weak shrinkage compensation ability due to the addition of the "Nb" element.

[0004] According to the above product characteristics, the existing turbine shell casting system can no longer meet the design requirements of the product. If it is still designed according to the original process, there is a possibility of shrinkage and shrinkage holes, and it is more likely that the product will be insufficiently poured and unable to fill the mold, resulting in large-scale scrapping. And because of the characteristics of cast steel, ordinary risers cannot meet the shrinkage compensation requirements. To solve the above problems, it is necessary to first change the casting process and use coated sand casting instead of traditional clay sand manual modeling. In addition, in order to ensure product quality, it is necessary to redesign the turbine shell casting system based on the refractory properties of coated sand and the material properties of heat-resistant steel. Utility Model Content

[0005] In order to solve the above problems, the present application provides a turbine casing casting mold.

[0006] The turbine casing casting mold provided in this application adopts the following technical solution:

[0007] A turbine casing casting mold comprises a product part, the product part has an air inlet flange end, an air outlet end and a rotor connecting flange end, and a plurality of mounting bosses are arranged on the side wall thereof, the air inlet flange ends of the four product parts are all facing upward, and the rotor connecting flange ends are all facing outward, the four product parts are divided into two groups, the air outlet ends of each group of product parts are opposite, and are connected together through a central riser, the two groups of product parts are arranged in a central symmetrical manner, and a straight runner is vertically arranged at the central symmetrical point of the two groups of product parts, the top of the straight runner is connected to a pouring cup, and a cross runner is extended to both sides of the bottom thereof, and the two ends of the cross runner are respectively connected to the central riser, the top surface of the air inlet flange end of the product part is connected to a heating riser, the top of the rotor connecting flange end side of the product part is extended upward to an edge riser, and the rotor connecting flange end and the mounting boss of the product part are connected to a plurality of chillers.

[0008] Furthermore, the diameter of the central riser is 40-45 mm, and the height is 120-125 mm.

[0009] Furthermore, the diameter of the sprue is 35-40 mm.

[0010] Furthermore, the cross-sectional dimensions of the runner are 20×30 mm.

[0011] Furthermore, filter plates are provided inside the runners between the sprue and the center riser.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] The present application reduces the setting of shrinkage-feeding risers as much as possible through the rotational arrangement of multiple product parts, and reduces the filling time by setting a straight runner in the center of the product distribution, extending the bottom of the straight runner to both sides, and improving the dimensions of the straight runner and the cross runner; by separately setting a heating riser in the thick and large part of the product for shrinkage feeding, the product has better shrinkage-feeding performance, meets the customer's product quality requirements, and can smoothly and stably produce the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of this application;

[0015] Figure 2 This is a schematic diagram of the structure of the application from a bottom-up perspective;

[0016] Figure 3 This is a schematic diagram of the top-down viewing angle distribution of this application;

[0017] Figure 4 This is a schematic diagram of the structure of an existing turbine casing product.

[0018] Description of the numbers in the figure:

[0019] 1. Product department; 2. Center riser; 3. Sprue; 4. Sprue cup; 5. Horizontal runner; 6. Exothermic riser; 7. Edge riser; 8. Chill;

[0020] 11. Air inlet flange end; 12. Air outlet end; 13. Rotor connecting flange end; 14. Mounting boss. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0022] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] Embodiment 1:

[0025] The present application is further described in detail below in conjunction with the accompanying drawings.

[0026] The embodiment of the present application discloses a turbine shell casting mold, including a product part 1, the product part 1 has an air inlet flange end 11, an air outlet end 12 and a rotor connection flange end 13, and a plurality of mounting bosses 14 are provided on the side wall thereof, the air inlet flange ends 11 of the four product parts 1 are all facing upward, and the rotor connection flange ends 13 are all facing outward, the four product parts 1 are divided into two groups, the air outlet ends 12 of each group of product parts 1 are opposite, and are connected together through a central riser 2, the two groups of product parts 1 are arranged in a central symmetrical manner, and a straight runner 3 is vertically arranged at the central symmetrical point of the two groups of product parts 1 The top of the sprue 3 is connected to a pouring cup 4, and a cross runner 5 is extended to both sides of the bottom. The two ends of the cross runner 5 are respectively connected to the center riser 2. The top surface of the air inlet flange end 11 of the product part 1 is connected to a heating riser 6, and the top of the rotor connecting flange end 13 of the product part 1 is extended upward to provide an edge riser 7. The rotor connecting flange end 13 of the product part 1 and the mounting boss 14 are connected to a plurality of chills 8. The chill 8 adopts a simple shape as much as possible. If it cannot be met, a special-shaped chill 8 can be made according to the shape of the quenching surface.

[0027] Preferably, the central riser 2 has a diameter of 40-45 mm and a height of 120-125 mm.

[0028] Preferably, the diameter of the sprue 3 is 35-40 mm.

[0029] Preferably, the cross-sectional size of the runner 5 is 20×30 mm.

[0030] Preferably, a filter sheet is provided inside the runner 5 between the sprue 3 and the center riser 2 .

[0031] The implementation principle of a turbine casing casting mold in an embodiment of the present application is as follows: the present application arranges four product parts 1 in a rotational arrangement in a single casting system, and the air outlet ends 12 of the four products correspond to each other in pairs, and a riser is added in the middle of each pair of air outlets, so that the two air outlet ends 12 can be compensated for shrinkage at the same time to ensure that the product uses less risers; a straight runner 3 is set at the distribution center of the four product parts 1, and a cross runner 5 is set to extend from the bottom of the straight runner 3 to both sides, and the pouring speed is increased and the pouring time is reduced by improving the sizes of the straight runner 3 and the cross runner 5; for the air inlet flange end 11 with thick wall thickness, a heating riser 6 is used to compensate for the shrinkage of molten iron, and the outer rotor connection flange end 13 is compensated for shrinkage by extending the edge riser 7 upward, and the position where the riser cannot be used for shrinkage compensation is set with a cold iron 8 for quenching, which effectively improves the shrinkage, shrinkage holes and other defects caused by the difference in product wall thickness, meets the customer's product quality requirements, and can smoothly and stably produce products.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A turbine housing casting mold, comprising a product part (1), the product part (1) having an air inlet flange end, an air outlet end and a rotor connection flange end, and having a plurality of mounting bosses on its side wall, characterized in that: The air inlet flange ends of the four product parts (1) are all facing upwards, and the rotor connection flange ends are all facing outwards. The four product parts (1) are divided into two groups. The air outlet ends of each group of product parts (1) are opposite to each other and are connected together through a central riser (2). The two groups of product parts (1) are arranged in a central symmetrical manner. A straight runner (3) is vertically arranged at the central symmetrical point of the two groups of product parts (1). The top of the straight runner (3) is connected to a pouring cup (4), and a horizontal runner (5) is extended to both sides of the bottom. The two ends of the horizontal runner (5) are respectively connected to the central riser (2). The top surface of the air inlet flange end of the product part (1) is connected to a heating riser (6). The top of the rotor connection flange end of the product part (1) is extended upward to an edge riser (7). The rotor connection flange end of the product part (1) and the mounting boss are connected to a plurality of cold irons (8).

2. A turbine housing casting mold according to claim 1, characterized in that: The central riser (2) has a diameter of 40 to 45 mm and a height of 120 to 125 mm.

3. A turbine housing casting mold according to claim 1, characterized in that: The diameter of the sprue (3) is 35-40 mm.

4. A turbine housing casting mold according to claim 1, characterized in that: The cross-sectional dimensions of the runner (5) are 20×30 mm.

5. A turbine housing casting mold according to claim 1, characterized in that: A filter sheet is arranged inside the runner (5) between the sprue (3) and the central riser (2).

Images