Anti-loosening casting device for VTG volute

Abstract

The utility model provides a kind of VTG volute anti-loosening casting device, belong to volute casting technical field.A kind of VTG volute anti-loosening casting device, including the volute casting mold with volute cavity and casting gate, the volute casting mold is equipped with with the first riser, second riser and top riser that communicate with the volute cavity;The first riser is fixedly connected in first flange end portion, the second riser is fixedly connected in gas outlet end, the casting gate is fixedly connected with the second flange end portion;The top riser is fixedly connected on the top boss side upper portion.The utility model is by adjusting the position of riser to top boss casting place, continues to carry out supplementing.The longer hot section area is better by inside to outside sequential solidification;By adjusting riser position, adjust casting structure design and the cooperation of cold iron greatly reduce the risk of volute top boss thick part angle shrinkage, the quality of casting is more reliable, and finished product qualification rate is obviously improved.

Description

Technical Field

[0001] This utility model belongs to the field of volute casting technology, specifically relating to a VTG volute anti-shrinkage casting device. Background Technology

[0002] Volute castings have complex structures, typically featuring narrow flow channels and thin-walled shells, requiring extremely high surface quality and dimensional accuracy. Therefore, strict quality control is essential for volute-type parts during casting production.

[0003] In the actual production process of an old VTG volute casting process, refer to Figure 1 The thick boss at the top of the volute housing solidifies slowly due to its large modulus, creating a large temperature difference with other parts. The surrounding area solidifies first, which blocks the molten metal feeding channel, forming an isolated liquid phase region. The imbalance between feeding and solidification control leads to micro-voids or loose structures formed due to insufficient feeding during the metal solidification process. As a result, shrinkage porosity occurs at the corner of the thick boss at the top, which seriously affects the product production quality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a VTG volute anti-shrinkage casting device, which addresses the issue of shrinkage porosity caused by the included angle of the thick boss at the top of the upper box during the existing VTG volute casting process.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A VTG volute anti-shrinkage casting device includes a casting gating system and a volute mold with a volute cavity. The volute mold is provided with a first riser, a second riser, and a top riser, all of which are in communication with the volute cavity. The volute mold includes a first flange, a second flange, a vent end, and a top boss. The first riser is fixedly connected to the end of the first flange, the second riser is fixedly connected to the vent end, the casting gating system is fixedly connected to the end of the second flange, and the top riser is fixedly connected above the top boss.

[0007] Furthermore, the volute mold also includes a turbine chamber mandrel; a groove is provided on the outer side of the turbine chamber mandrel away from the top boss and near the first flange; the groove is an arc-shaped structure facing the top boss and with a gradually decreasing cross-sectional area; a second-order groove with a depth greater than the groove is provided below the groove.

[0008] Furthermore, a conformal chill is provided on the outer side of the turbine chamber mandrel, and a protrusion is provided on the lower part of the conformal chill.

[0009] Furthermore, the conformal chill protrusion is inserted into the second-order groove, and the remaining portion is snapped and fixed into the groove.

[0010] Furthermore, the turbine chamber spindle has a transition fillet at its edge.

[0011] Furthermore, the conformal chill is tightly fitted and connected to the side of the turbine chamber mandrel.

[0012] Compared with existing technologies, this invention continuously feeds the steel by adjusting the riser position to the top boss mold. Furthermore, a groove is created on the outside of the turbine chamber mandrel to reduce the thickness of the hot spot region, thereby lowering the hot nodes in the shrinkage porosity area and allowing the molten steel to solidify rapidly in stages. Adding chills outside the turbine chamber mandrel further ensures better sequential solidification of the longer hot spot region from the inside out. By adjusting the riser position, modifying the mold structure design, and utilizing the chills, the risk of shrinkage porosity at the included angle in the thick section of the top boss of the volute is significantly reduced, resulting in more reliable casting quality and a significantly improved finished product yield. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 : CAE hotspot simulation analysis diagram before the improvement of this utility model;

[0015] Figure 2 The improved CAE hotspot simulation analysis diagram of this utility model;

[0016] Figure 3 : A three-dimensional structural diagram of this utility model;

[0017] Figure 4 : A top view of the structure of this utility model;

[0018] Figure 5 : A schematic diagram of the cross-sectional structure of this utility model along the axial direction of the turbine chamber spindle;

[0019] Figure 6 Side view of the volute mold of this utility model;

[0020] Figure 7 : Schematic diagram of the conformal chill structure of this utility model;

[0021] in Figure 1 The number 24 refers to the top riser before the improvement.

[0022] In one embodiment, 1-volute mold, 11-first flange, 12-second flange, 13-outlet end, 14-top boss, 15-turbine chamber mandrel, 16-transition fillet, 2-volute cavity, 21-first riser, 22-second riser, 23-top riser, 3-casting runner, 4-groove, 41-second-stage groove, 5-conformable chill, 51-protrusion. Detailed Implementation

[0023] 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.

[0024] See Figure 1 The CAE hotspot simulation analysis profile shows that the position of the top riser in the old process is unreasonable. The top riser 24, which is fixedly connected to the top of the second flange of the volute, exacerbates the problem of hotspot concentration in the solidification process of the molten steel in the isolated liquid phase region, increasing the risk of shrinkage porosity.

[0025] Example 1: A VTG volute anti-shrinkage casting device includes a casting gating 3 and a volute mold 1 with a volute cavity 2. The volute mold 1 is provided with a first riser 21, a second riser 22 and a top riser 23, all of which are connected to the volute cavity 2. The volute mold 1 includes a first flange 11, a second flange 12, an air outlet end 13 and a top boss 14.

[0026] The first riser 21 is fixedly connected to the end of the first flange 11, the second riser 22 is fixedly connected to the vent end 13, and the casting runner 3 is fixedly connected to the end of the second flange 12; the top riser 23 is fixedly connected above the side of the top boss 14. By changing the position of the top riser 23, the top riser 23 is used as a "reservoir" for molten metal, continuously feeding the thick part of the top boss 14, ensuring that the thick part of the top boss 14 is always at the end of the liquid feeding channel, reducing the risk of shrinkage at the included angle of the thick part of the top boss 14 of the volute.

[0027] Example 2, see Figure 2 This embodiment is an improvement on embodiment 1.

[0028] Furthermore, the volute casting 1 also includes a turbine chamber mandrel 15; a groove 4 is provided on the outer side of the turbine chamber mandrel 15 away from the top boss 14 and near the first flange 11.

[0029] Preferably, the groove 4 is an arc-shaped structure facing the top boss 14 and with a gradually decreasing cross-sectional area.

[0030] Furthermore, a second-order groove 41 with a depth greater than that of the groove 4 is provided below the groove 4.

[0031] By optimizing the structure by setting grooves 4 and second-order grooves 41 on the outer side of the turbine chamber mandrel 15, the hot spot area facing the top boss 14 is decomposed into multiple stepped thin-walled areas, reducing the hot spot modulus and shortening its solidification time, thus significantly improving the feeding efficiency. Furthermore, the gradient decreasing arc design of the groove 4's cross-sectional area works synergistically with the feeding top riser 23, establishing a gradually decreasing temperature field pointing towards the top riser 23, reducing the hot spots in the shrinkage porosity area, and enabling the molten steel to solidify sequentially. It also reduces machining allowances and material waste.

[0032] Example 3, see Figure 2 This embodiment is an improvement on embodiment 2.

[0033] Furthermore, a conformal chill 5 is provided on the outer side of the turbine chamber mandrel 15, and a protrusion 51 is provided on the lower part of the conformal chill 5. The protrusion 51 of the conformal chill is partially inserted into the second-order groove 41, and the remaining part is snapped and fixed into the groove 4. The edge of the turbine chamber mandrel 15 is provided with a transition fillet 16. The conformal chill 5 is tightly fitted and connected to the side of the turbine chamber mandrel 15. The conformal chill 5 is completely fitted with the curved surface of the groove 4, establishing a solidification cooling gradient pointing towards the top riser 23, accelerating the cooling rate, allowing the longer hot spot area to solidify sequentially from the inside to the outside, and performing synchronous shrinkage compensation in conjunction with the top riser 23, avoiding the risk of shrinkage porosity in the isolated molten pool angle area of ​​the top boss 14.

[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 VTG volute anti-shrinkage casting device, comprising a casting gating system and a volute mold with a volute cavity, characterized in that: The volute mold is provided with a first riser, a second riser, and a top riser, all of which are in communication with the volute cavity; the volute mold includes a first flange, a second flange, an outlet end, and a top boss; the first riser is fixedly connected to the end of the first flange, the second riser is fixedly connected to the outlet end, the casting runner is fixedly connected to the end of the second flange, and the top riser is fixedly connected above the top boss.

2. The VTG volute anti-shrinkage casting device according to claim 1, characterized in that: The volute mold also includes a turbine chamber mandrel; a groove is provided on the outer side of the turbine chamber mandrel away from the top boss and near the first flange; the groove is an arc-shaped structure facing the top boss and with a gradually decreasing cross-sectional area; a second-order groove with a depth greater than the groove is provided below the groove.

3. The VTG volute anti-shrinkage casting device according to claim 2, characterized in that: A conformal chill is provided on the outer side of the turbine chamber mandrel, and a protrusion is provided on the lower part of the conformal chill.

4. The VTG volute anti-shrinkage casting device according to claim 3, characterized in that: The conformal chill protrusion is inserted into the second-order groove, and the remaining portion is snapped and fixed into the groove.

5. The VTG volute anti-shrinkage casting device according to claim 4, characterized in that: The turbine chamber spindle has a rounded edge.

6. The VTG volute anti-shrinkage casting device according to claim 4, characterized in that: The conformal chill is tightly fitted and connected to the side of the turbine chamber mandrel.

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