Sand mold structure of integrated casting
By using a sand mold structure with multiple inlet pouring and riser feeding, the internal defect problem of integrated castings during the casting process was solved, and the stability and performance consistency of the castings were achieved in the high-temperature environment of new energy vehicles.
Patent Information
- Application Number
- CN202520661595.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-04-09
AI Technical Summary
Integrated castings are prone to problems such as internal shrinkage during the casting process, making it difficult to meet the high-temperature working environment requirements of new energy vehicles.
A multi-inlet pouring method is adopted, and a riser is added in the middle of the sand mold. In particular, a spherical riser is set at the hot spot of the casting. By pouring at multiple inlets simultaneously and feeding through risers, the temperature distribution and feeding effect of the casting are optimized.
It improves the pouring speed and temperature uniformity of castings, reduces internal defects, and ensures the stability and performance consistency of castings in high-temperature environments.
Smart Images
Figure CN223762086U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cast iron casting technology, specifically to a sand mold structure for integrated castings. Background Technology
[0002] The new energy vehicle industry has achieved rapid development and its scale has grown rapidly. Reducing the production cost of new energy vehicle parts is a future trend. Part integration is an important means of cost reduction, lowering both casting and assembly costs. Part integration refers to combining several separate castings into a single composite casting. For composite castings, the structure becomes more complex, with significant variations in thickness, larger profiles, and more hot spots. This makes them more prone to internal shrinkage and porosity issues during the casting process, resulting in castings that cannot meet the demands of the long-term, high-temperature operating environment of automobiles. Utility Model Content
[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to utilize the product's structural characteristics, adopt a multi-inlet method during casting, and add a riser in the middle of the sand mold to compensate for the shrinkage at the hot spot in the middle of the product and eliminate internal defects.
[0004] A sand mold structure for an integrated casting includes a lower box and an upper box. A sand mold is provided inside the upper box and the lower box. The sand mold has a cavity for forming the integrated casting. The upper box includes a first inlet, a second inlet, and a third inlet. The first inlet, the second inlet, and the third inlet correspond to the front side, the middle part, and the rear side of the cavity, respectively. The sand mold includes a first escaping cavity and a second escaping cavity. The first escaping cavity is located in the middle part of the cavity, and the second escaping cavity is located at the edge of the cavity.
[0005] Furthermore, the first inlet, the second inlet, and the third inlet are equipped with slag-blocking components.
[0006] Furthermore, the first entrance, the second entrance, and the third entrance are connected by a channel.
[0007] Furthermore, the channel is provided with a pouring port.
[0008] Furthermore, the first oral cavity is spherical or hemispherical.
[0009] Furthermore, the cavity includes a planar portion and a peak portion, the planar portion corresponding to the area of thin casting, the peak portion corresponding to the area of thick casting, and the first ejector cavity is located near the peak portion.
[0010] Furthermore, the integrated casting is a cover plate for a complex multi-oil-circuit gearbox of a hybrid truck.
[0011] The technical solution of this utility model has the following technical effects:
[0012] During the pouring process, the pouring liquid enters the channel through the pouring gate, and then enters the cavity simultaneously through three inlets. This speeds up the pouring process and ensures the temperature of the casting during pouring, making it particularly suitable for pouring larger parts such as integrated castings.
[0013] By using spherical risers at the peak, the casting can effectively feed the thicker parts in the middle of the integrated casting during the cooling process, thus avoiding the situation where the risers at the edge cannot feed the middle part after the thin-walled parts on the outside of the integrated casting cool down. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the upper box structure in Example 1.
[0015] Figure 2 The following is a schematic diagram of the structure of the box in an embodiment.
[0016] Lower box 1, upper box 2, sand mold 3, cavity 31, first inlet 11, second inlet 12, third inlet 13, first sprue 32, second sprue 33, channel 15, pouring gate 151, flat part 34, peak part 35, first locking part 16, second locking part 17. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] A sand mold structure for an integrated casting is described in this embodiment, using a complex multi-oil-circuit gearbox cover plate of a hybrid truck as an example. It should be understood that the scope of protection of this application is not limited to this casting. The sand mold structure includes a lower housing 1 and an upper housing 2. The upper housing 2 is provided with a first locking part 16, and the lower housing 1 is provided with a second locking part 17. The first locking part 16 and the second locking part are matched. A sand mold 3 is provided inside the upper housing 1 and the lower housing 2. When the upper housing 1 and the lower housing 2 are closed, the first locking part 16 and the second locking part 17 are connected and locked, thereby providing a cavity 31 for forming the integrated casting within the sand mold 3 inside the lower housing 1 and the upper housing 2. The shape of the cavity 31 matches the shape of the integrated casting. Molten iron is injected into the cavity 31, and after cooling, the casting is formed.
[0019] The upper part of the upper housing 2 includes a first inlet 11, a second inlet 12, and a third inlet 13. The first inlet 11, the second inlet 12, and the third inlet 13 correspond to the front, middle, and rear sides of the mold cavity 31, respectively. The first inlet 11, the second inlet 12, and the third inlet 13 are connected by a channel 15, which is equipped with a pouring gate 151. Molten iron is poured through the pouring gate 151, and the molten iron enters the mold cavity 31 from the pouring gate 151 through the channel 15 and then through the first inlet 11, the second inlet 12, and the third inlet 13, respectively. The first inlet 11, the second inlet 12, and the third inlet 13 are equipped with slag-blocking components to prevent large particles of impurities from entering the mold cavity, thereby ensuring the quality of the casting.
[0020] The mold cavity 31 includes a first riser cavity 32, a second riser cavity 33, a flat portion 34, and a peak portion 35. The flat portion 34 corresponds to the area with a small casting thickness, and the peak portion 35 corresponds to the area with a large casting thickness. The first riser cavity 32 is located near the peak portion 35. In this embodiment, the first riser cavity 32 is located in the middle of the mold cavity 31, and the second riser cavity 33 is located at the edge of the mold cavity 31. The first riser cavity 32 is hemispherical. It can be understood that the shape of the first riser cavity 32 can also be set to spherical, cylindrical, etc. In this embodiment, the riser diameter is 60mm, the gate size is 20*16=320mm2, the size of the first inlet 11 is 35*3T=105mm2, the size of the first inlet 12 is 30*3.2t=96mm2, and the size of the third inlet 13 is 25*8=200mm2.
[0021] During the casting process, the molten iron enters the channel through the pouring gate and then enters the mold cavity simultaneously through three inlets. This reduces the temperature difference during the solidification process of the molten iron in different parts of the product, ensures the consistency of the metallographic structure of the product, thereby reducing the hardness difference in different parts and preventing the formation of cementite in thin-walled areas.
[0022] By using spherical risers at the peak, the casting can effectively feed the thicker parts in the middle of the integrated casting during the cooling process, thus avoiding the situation where the risers at the edge cannot feed the middle part after the thin-walled parts on the outside of the integrated casting cool down.
[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A sand mold structure of an integrated casting, characterized by, The sand mold is arranged in the upper box and the lower box, and the sand mold is provided with a cavity for forming an integrated casting.
2. The integrated sand-structure of the casting according to claim 1, characterized in that, The first inlet, the second inlet and the third inlet are provided with a slag blocking assembly.
3. The integrated sand-structure of the casting according to claim 1, characterized in that, The first inlet, the second inlet and the third inlet are communicated through a channel.
4. The sand-structure of an integrated casting according to claim 3, characterized in that The channel is provided with a pouring opening.
5. The sand-structure of an integrated casting according to claim 1, wherein The first riser cavity is in a spherical or hemispherical shape.
6. The sand-structure of an integrated casting according to claim 1, wherein The cavity comprises a flat portion and a peak portion, the flat portion corresponds to a region with small thickness of the casting, and the peak portion corresponds to a region with large thickness of the casting, and the first riser cavity is arranged near the peak portion.
7. The integrated sand-structure of the casting according to claim 1, characterized in that, The integrated casting is a multi-oil-way complex gearbox cover plate of a hybrid truck.