A volute casting device

Abstract

This utility model provides a volute casting device, belonging to the field of volute casting technology. The volute casting device includes a blank casting process table, process table risers, a horizontal sprue, and a sprue bar. Each end of the horizontal sprue is fixedly connected to a process table riser, and each process table riser is connected to a blank casting process table on both sides. A sprue bar is vertically connected upwards to the middle of the horizontal sprue. This utility model reduces the number of side-supported sprues and eliminates the gas inlet flange riser method, saving two risers, two riser sleeves, and the molten metal used in casting production, thus saving production costs. By adjusting and selecting the casting scheme according to the casting type, material characteristics, and production batch, it achieves a highly efficient and low-consumption casting production process, improving the yield.

Description

Technical Field

[0001] This utility model belongs to the field of volute casting technology, and specifically relates to a volute casting device. Background Technology

[0002] As a core component of fluid machinery such as pumps, turbines, and compressors, the casting process of the volute directly affects the performance and quality of the product. In volute casting, the design of the gating system must take into account the complexity of the flow channels, differences in wall thickness, and fluid dynamic performance requirements. Based on the structural characteristics and material properties of the volute, a reasonable gating system should be designed with stable fluid filling and directional feeding as the core, avoiding defects such as shrinkage porosity, shrinkage cavities, and inclusions. Utility Model Content

[0003] The technical problem to be solved by this utility model is volute casting. In view of the shortcomings of the prior art, a volute casting device is provided.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A volute casting apparatus includes a blank casting process table, process table risers, a sprue, and a sprue bar; each of the two ends of the sprue is fixedly connected to a process table riser, and each process table riser is connected to the blank casting process table on both sides; a sprue bar is vertically connected to the middle part of the sprue.

[0006] Furthermore, an air inlet flange riser is provided at the air inlet flange of the volute to be cast on the blank casting process table.

[0007] Furthermore, filters are provided on both sides of the horizontal sprue near the vertical sprue bar.

[0008] Furthermore, a heating riser sleeve is provided on the riser of the process platform.

[0009] Furthermore, the direct pouring bar is provided with a buffer recess in the downward direction relative to the horizontal pouring channel.

[0010] Furthermore, the cross-sectional area of ​​the buffer recess outlet is 1.1 to 1.2 times the area of ​​the horizontal gating inlet.

[0011] Furthermore, the height of the direct casting bar is higher than the blank casting process table.

[0012] Optionally, the filter is a honeycomb porous ceramic filter made of mullite, high alumina or silicon carbide, or an open-cell foam ceramic filter made of zirconium oxide, silicon carbide or alumina.

[0013] Compared with existing technologies, this utility model reduces the number of side-supported gating channels and eliminates the gas inlet flange riser injection method, saving two risers, two riser sleeves, and the molten metal used in casting production, thus saving production costs. By combining the casting type, material characteristics, and production batch, the casting scheme is adjusted and selected to achieve an efficient and low-consumption casting production process, thereby improving the yield. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 : A comparative structural schematic diagram of this utility model;

[0016] Figure 2 : A top view of the structure of an embodiment of this utility model;

[0017] Figure 3 : A three-dimensional structural schematic diagram of an embodiment of this utility model;

[0018] Figure 4 : A schematic diagram of the vertical cross-sectional structure along the length of the horizontal runner in this embodiment of the present invention;

[0019] Among them, the comparative examples are: 11-casting process table for blanks, 22-process table riser, 33-air inlet flange riser, 44-horizontal sprue, 55-sprue bar, 66-side support sprue, 77-heating riser sleeve.

[0020] Example: 1-Slab casting process table, 2-Process table riser, 3-Inlet flange riser, 4-Horizontal sprue, 5-Sprue bar, 6-Filter, 7-Heating riser sleeve, 8-Buffer socket. Detailed Implementation

[0021] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0022] For comparison, see [reference]. Figure 1 .

[0023] The existing volute casting apparatus includes four blank casting process tables 11, four process table risers 22, four inlet flange risers 33, a gating system 44, and a sprue 55. Each blank casting process table 11 is flange-connected to a process table riser 22 and an inlet flange riser 33. The gating system 44 is connected to the four process table risers 22 and the four inlet flange risers 33 via eight side-support gating systems 66. Each process table riser is equipped with a heating riser sleeve 77. The sprue 55 is vertically positioned in the middle of the gating system 44. During casting, molten metal enters the gating system 44 from the sprue 55, then flows through the side-support gating systems 66 into the process table risers 22 and inlet flange risers 33, and finally flows into the blank casting process table 11 for volute casting.

[0024] Existing casting equipment often has multiple side-supported runners, which can easily generate eddies at bends, increasing the risk of air entrapment. Furthermore, the volute inlet flange serves as the starting point for mold filling, making it easy for gas to be carried into the volute's flow channels by the molten metal, forming porosity and resulting in low product yield. Premature heat dissipation of the molten metal in the side runners can lead to premature solidification at the end, blocking the feeding path and increasing the risk of shrinkage porosity in the casting. Moreover, the large amount of molten metal used during casting increases costs.

[0025] Example 1, see Figure 2-4 .

[0026] A volute casting apparatus includes a blank casting process table 1, a process table riser 2, a horizontal sprue 4, and a sprue bar 5; the horizontal sprue 4 is fixedly connected to the process table riser 2 at both ends, and the process table riser 2 is connected to the blank casting process table 1 on both sides; the horizontal sprue 4 is vertically connected to the sprue bar 5 at the middle part.

[0027] Furthermore, the inlet flange riser 3 is provided at the inlet flange of the volute to be cast on the blank casting process table 1; in this embodiment, the inlet flange riser is eliminated from the casting method compared with the comparative example, but the inlet flange riser 3 is still retained for exhaust and feeding.

[0028] Filters 6 are installed on both sides of the horizontal runner 4 near the sprue bar 5. The filters 6 remove non-metallic inclusions such as slag, sand particles, and oxides from the molten metal, reducing porosity and inclusion defects in the casting. Furthermore, the filtered molten metal flows more smoothly, reducing turbulence and secondary oxidation. This improves the density, fatigue strength, and corrosion resistance of the casting, and also reduces the scouring and adhesion of impurities to the mold cavity, extending the mold life.

[0029] Furthermore, the process platform riser 2 is provided with a heating riser sleeve 7, which prolongs the time the riser remains in a liquid state and continuously replenishes the hot spot of the casting.

[0030] Furthermore, the sprue 5 is provided with a buffer recess 8 extending downward relative to the runner 4 to reduce the impact of molten metal on the runner 4. The volume of the buffer recess 8 can temporarily store the molten metal, reducing the flow rate (approximately 30%~50%) and preventing splashing or eddy currents. When the molten metal briefly resides in the buffer recess, denser impurities such as slag and sand particles sink to the bottom due to gravity, reducing the sources of defects entering the mold cavity. Through the diffusion effect of the buffer recess, the pressure distribution of the molten metal entering the runner is balanced, ensuring uniform filling of the multi-gate mold. The outlet cross-sectional area of ​​the buffer recess 8 is 1.1~1.2 times the inlet area of ​​the runner 4, preventing the formation of flow bottlenecks.

[0031] Furthermore, the height of the sprue 5 is higher than that of the blank casting process table 1; using the sprue 5 as a pressure transmission channel, static pressure is established by gravity to provide power for the molten metal to fill the cavity.

[0032] Optionally, the filter 6 is a honeycomb porous ceramic filter made of mullite, high alumina or silicon carbide, or an open-cell foam ceramic filter made of zirconium oxide, silicon carbide or alumina.

[0033] Compared with existing technologies, this invention reduces the number of side-supported gating channels and eliminates the gas inlet flange riser injection method, saving two risers, two riser sleeves, and the molten metal used in casting production, thus reducing production costs. By adjusting and selecting the casting scheme according to the casting type, material characteristics, and production batch, it achieves an efficient and low-consumption casting production process, thereby improving the yield.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A volute casting apparatus, characterized by: It includes a blank casting process table, process table risers, a gating system, and a sprue; the gating system has process table risers fixedly connected to both ends of the gating system, and each process table riser is connected to the blank casting process table on both sides; the gating system has a sprue vertically connected to the middle part of the gating system.

2. A volute casting device according to claim 1, characterized in that: An air inlet flange riser is provided at the air inlet flange of the volute to be cast on the blank casting process table.

3. The volute casting device of claim 1, wherein: Filters are installed on both sides of the horizontal runner near the vertical pouring bar.

4. The volute casting device of claim 1, wherein: A heating riser sleeve is provided on the riser of the process platform.

5. The volute casting apparatus according to claim 1, characterized in that: The direct pouring bar has a buffer recess in the downward direction relative to the horizontal pouring channel.

6. The volute casting device according to claim 1 or 5, characterized by: The height of the direct pouring bar is higher than the blank casting process table.

7. The volute casting device of claim 3, wherein: The filter is a honeycomb porous ceramic filter made of mullite, high-alumina or silicon carbide.

8. The volute casting device of claim 3, wherein: The filter is an open-cell foam ceramic filter made of zirconium oxide, silicon carbide, or alumina.

9. The volute casting device of claim 5, wherein: The cross-sectional area of ​​the buffer recess outlet is 1.1 to 1.2 times the area of ​​the horizontal gating inlet.

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