Feeding structure of annular casting
By using ellipsoidal risers in the annular castings for replenishment, the problem of local shrinkage in the ring castings is solved, the utilization rate of molten steel and replenishment effect are improved, the occurrence of defects is reduced, and the mechanical properties and service life of the castings are improved.
Patent Information
- Application Number
- CN202421938385.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-09
AI Technical Summary
During the solidification process, due to the difference in solidification time of different parts, local shrinkage cannot be supplemented in time, which is prone to defects such as shrinkage and shrinkage, affecting its mechanical properties and service life.
The thick side walls of the annular structure casting are replenished by an ellipsoidal riser. The static pressure head of the ellipsoidal riser is high and the cross-sectional area is small, which improves the utilization rate of the molten steel and has a good replenishment effect.
It improves the utilization rate of molten steel, improves the shrinkage effect of castings, reduces the occurrence of defects such as shrinkage holes and shrinkage, and improves the mechanical properties and service life of castings.
Smart Images
Figure CN223043588U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of precision casting, and specifically relates to a feeding structure for an annular casting. Background Art
[0002] During the solidification process of molten metal from liquid to solid, volume shrinkage will occur. Due to the special shape of the annular casting, the solidification time may vary in different parts, which easily leads to the situation that local shrinkage cannot be replenished in time, resulting in defects such as shrinkage cavities and porosity. For an annular casting with uneven wall thickness, the thick-wall part has a long solidification time and requires more molten metal to be replenished, while the thin-wall part solidifies faster. Without effective feeding, defects are likely to appear in the thick-wall part. Annular castings need to bear large loads or have high sealing performance requirements in many application scenarios. If there are defects such as shrinkage cavities and porosity, it will seriously affect their mechanical properties and service life.
[0003] A riser refers to a supplementary part added above or on the side of a casting to avoid defects in the casting. The cavity of the riser is a cavity for storing liquid metal, which supplies metal during the formation of the casting and has the functions of preventing shrinkage cavities, porosity, exhausting gas, and collecting slag, and the main function of the riser is feeding. The shape of the riser directly affects the feeding effect of the riser. During design, the riser should be made to have the smallest surface area as much as possible. The existing riser shapes are generally square, with low utilization rate of molten steel and poor feeding effect. Therefore, this application proposes a feeding structure for an annular casting. Content of the Utility Model
[0004] Aiming at the existing problems, the utility model provides a feeding structure for an annular casting, which can effectively solve the problems put forward in the background art.
[0005] To solve the above problems, the utility model adopts the following technical solutions:
[0006] A feeding structure for an annular casting, which includes a casting. The casting is of an annular structure. The casting includes a first side wall and a second side wall. The wall thickness of the second side wall is greater than that of the first side wall. An ellipsoidal riser is connected to the outer side surface of the second side wall. A pad is provided on the radial surface of the second side wall, and the pad is connected to the root of the riser.
[0007] As a further scheme of the utility model: The pad is of a fan-shaped structure, and the pad gradually thickens along the radial direction from the inner surface of the second side wall until the root of the riser.
[0008] As a further scheme of the utility model: The diameter of the hot spot circle at the joint of the first side wall and the second side wall is d, the wall thickness of the second side wall is h, and the axial length of the connection between the riser and the casting is B, where B = 1.1d + 0.3h.
[0009] As a further solution of the present utility model: the height of the riser is H, where H = (2.65 - 2.75)B.
[0010] As a further solution of the present utility model: the maximum diameter of the riser is D, where D = (1.65 - 1.8)B.
[0011] As a further solution of the present utility model: the risers are provided in multiple numbers and are circumferentially distributed.
[0012] As a further solution of the present utility model: three risers are provided and the risers correspond to the chaplets one by one.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: the present utility model uses an ellipsoidal riser to compensate for the thick side wall of the annular structure casting. The ellipsoidal riser has a high static head and a small cross-sectional area size, improving the utilization rate of molten steel and having a good feeding effect. Brief Description of the Drawings
[0014] Figure 1 It is a longitudinal sectional view of a feeding structure for an annular casting;
[0015] Figure 2 It is a three-dimensional structure view of a feeding structure for an annular casting;
[0016] Figure 3 It is a riser distribution view of a feeding structure for an annular casting.
[0017] In the figure: 1, casting; 2, first side wall; 3, second side wall; 4, riser; 5, chaplet. Detailed Embodiment
[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0019] Combined with Figures 1 to 3 To illustrate this embodiment, this embodiment provides a feeding structure for an annular casting, which includes a casting 1. The casting 1 is of an annular structure. The casting 1 includes a first side wall 2 and a second side wall 3. The wall thickness of the second side wall 3 is greater than that of the first side wall 2. The solidification speed of the second side wall 3 is less than that of the first wall thickness. The outer side surface of the second side wall 3 is connected with a riser 4. The riser 4 is ellipsoidal. A chaplet 5 is provided on the radial surface of the second side wall 3. The chaplet 5 is connected to the root of the riser 4.
[0020] At the connection of the first side wall 2 and the second side wall 3 is a hot spot. Use drawing software to draw the shape of the hot spot of the casting 1, and then draw the inscribed circle of the hot spot, which is the hot spot circle. The method of rolling the hot spot circle is used to determine the size of the riser 4. Starting from above the effective feeding distance of the riser 4, a pad 5 is added. The pad 5 is of a fan-shaped structure, and the pad 5 gradually thickens radially from the inner surface of the second side wall 3 until the root of the riser 4. The width of the pad 5 is determined according to the size of the hot spot circle. Specifically, the diameter of the hot spot circle at the connection of the first side wall 2 and the second side wall 3 is d, the wall thickness of the second side wall 3 is h, and the axial length at the connection of the riser 4 and the casting 1 is B. Among them, B = 1.1d + 0.3h. The maximum length of the pad 5 on the side fitting the riser 4 is the axial length B at the connection of the riser 4 and the casting 1 minus the height of the second side wall 3. The height of the riser 4 is H, where H = (2.65 - 2.75)B. The maximum diameter of the riser 4 is D, where D = (1.65 - 1.8)B.
[0021] As another implementation, as Figures 2-3 shown, the risers 4 are provided in multiple and are circumferentially distributed. In this example, the risers 4 are provided in three and the risers 4 correspond to the pads 5 one by one, so that the feeding metal capacity of a single riser 4 can be reduced.
[0022] The working principle of the present utility model is: an ellipsoidal riser 4 is used to feed the thick side wall of the annular structure casting 1. The ellipsoidal riser 4 has a higher hydrostatic head than the conventional riser structure, but the cross-sectional area is only 80% of the conventional riser, improving the utilization rate of molten steel and having a good feeding effect.
[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.
[0024] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A shrinkage feeding structure of an annular casting, comprising a casting, characterized in that: The casting is an annular structure, comprising a first side wall and a second side wall, wherein the wall thickness of the second side wall is greater than that of the first side wall, the outer surface of the second side wall is connected to a riser, the riser is ellipsoidal, and the radial surface of the second side wall is provided with a subsidy, which is connected to the root of the riser.
2. A shrinkage feeding structure for an annular casting according to claim 1, characterized in that: The subsidy is a fan-shaped structure, and the subsidy gradually thickens along the radial direction from the inner surface of the second side wall to the root of the riser.
3. A feeding structure for an annular casting according to claim 1, characterized in that: The diameter of the hot pitch circle at the connection between the first side wall and the second side wall is d, the wall thickness of the second side wall is h, and the axial length of the connection between the riser and the casting is B, wherein B=1.1d+0.3h.
4. A shrinkage feeding structure for an annular casting according to claim 3, characterized in that: The height of the riser is H, wherein H=(2.65-2.75)B.
5. The shrinkage feeding structure of an annular casting according to claim 3, characterized in that: The maximum diameter of the riser is D, wherein D=(1.65-1.8)B.
6. The shrinkage feeding structure of an annular casting according to claim 1, characterized in that: The risers are arranged in a plurality and distributed in a circumference.
7. A feeding structure for an annular casting according to claim 6, characterized in that: The number of risers is three and the risers correspond to the subsidies one by one.