Sand mold assembly for casting a wheel hub side mold
By optimizing the wall thickness and riser structure of the wheel hub side mold sand mold assembly, and combining it with filter screens and inorganic sand cores, the problems of shrinkage cavities and porosity in the casting process were solved, achieving efficient and high-quality casting results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Filing Date
- 2022-12-28
- Publication Date
- 2026-06-19
AI Technical Summary
Existing technologies are prone to defects such as shrinkage cavities and porosity when casting wheel hub side molds, and existing sand mold manufacturing methods are complex and difficult to achieve efficient production.
Design a sand mold assembly for casting wheel hub side molds, including an upper sand mold and a lower sand mold, optimize wall thickness and riser structure, set multiple riser channels and filters, and combine with inorganic sand cores to achieve uniform cooling and feeding.
By optimizing the wall thickness and riser structure, shrinkage cavities and porosity defects were reduced, improving casting quality. Furthermore, uniform cooling and feeding effects of the castings were achieved through the use of filter screens and inorganic sand cores, thereby increasing production efficiency.
Smart Images
Figure CN115958159B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a sand mold, and more particularly to a sand mold assembly for casting wheel hub side molds, belonging to the field of mold design and manufacturing technology. Background Technology
[0002] Wheel hub molds consist of side molds, upper molds, and lower molds. Each set of wheel hub molds has a different side mold shape and size. Different side mold casting molds are required for different shapes and sizes. Based on the material, casting molds can be divided into metal molds and sand molds. Metal molds are mainly used for mass production and are suitable for manufacturing alloy castings such as aluminum, magnesium, and zinc. Sand molds, on the other hand, have lower manufacturing costs and higher refractoriness, and are mainly used for single-piece, small-batch production, suitable for castings such as cast iron and cast steel. Wheel hub side molds are generally made of 42CrMo cast steel, with casting temperatures as high as 1620 degrees Celsius, making sand molds a more suitable choice. We noted that existing patent 201810459413.4 discloses a method for manufacturing a mold with conformal cooling channels. First, a mold drawing with conformal cooling channels is designed from a product drawing, obtaining the 3D model data of the mold. Then, through model data conversion, solid areas are hollowed out, and holes, pipes, and hollowed-out areas are converted into solids, with added solid borders. This process reverse-engineers the 3D model data of a sand mold used for casting the mold blank. This sand mold has a complex core, which cannot be manufactured using conventional methods, but can be easily manufactured using 3D printing. Metal is then poured into this sand mold to obtain a mold blank with conformal cooling channels. The casting material can be the mold material itself. After obtaining the mold casting blank, it is directly processed to finally obtain the mold with conformal cooling channels. While the sand mold manufactured using this method can produce mold castings, the cast molds often exhibit defects such as shrinkage cavities and porosity. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention proposes a sand mold assembly for casting wheel hub side molds. The sand mold assembly includes an upper sand mold and a lower sand mold. A downwardly protruding core is formed on the upper sand mold. The lower sand mold is approximately bowl-shaped and includes a left longitudinal cavity wall, a right longitudinal cavity wall, a front transverse cavity wall, a rear transverse cavity wall, and a cavity bottom wall. The left longitudinal cavity wall, right longitudinal cavity wall, front transverse cavity wall, rear transverse cavity wall, and cavity bottom wall form an upward-opening concave cavity. When the upper and lower sand molds are closed together, the core is inserted into the concave cavity, forming a casting cavity for casting wheel hub side molds between the inner wall of the concave cavity and the outer wall of the core. The invention is characterized in that the left longitudinal cavity wall and the right longitudinal cavity wall of the lower sand mold... The wall thickness is greater than that of the front transverse cavity wall and the rear transverse cavity wall. A first lower riser socket with an upward opening is provided on the left longitudinal cavity wall. The first lower riser socket is used to supply casting molten metal to the casting cavity. A liquid inlet channel is provided on the wall of the upper sand mold located to the left of the core. A pair of second upper riser channels are provided on the wall of the upper sand mold located to the right of the core. The pair of second upper riser channels respectively penetrate downward through the bottom wall of the upper sand mold. When the upper sand mold and the lower sand mold are closed together, the liquid inlet channel is used to supply casting molten metal to the first lower riser socket, and the second upper riser channels connect to the casting cavity and are used to supply casting molten metal to the casting cavity.
[0004] The wheel hub side mold is a component of the wheel hub mold, including a molding surface for casting the wheel hub rim and a back cavity located behind the molding surface. The core of the upper sand mold is mainly used to cast the back cavity.
[0005] The liquid inlet channel is a channel for conveying molten casting into the casting cavity. In one application, the liquid inlet channel is connected to a holding furnace for storing molten casting.
[0006] The upper sand mold and the lower sand mold are named according to their positional relationship when they are in the installation state, with the upper sand mold located above the lower sand mold.
[0007] In this context, the terms "longitudinal" and "transverse," "left" and "right," and "front" and "rear" in the left longitudinal cavity wall, right longitudinal cavity wall, front transverse cavity wall, and rear transverse cavity wall are named according to their relative positional relationship. Taking the left longitudinal cavity wall and right longitudinal cavity wall as an example, they are named according to their relative positional relationship in the left-right direction; one is named the left longitudinal cavity wall, and the other is named the right longitudinal cavity wall.
[0008] Specifically, the wall thickness of the left and right longitudinal cavity walls of the lower sand mold is greater than the wall thickness of the front and rear transverse cavity walls. This means that the wall thickness of the left longitudinal cavity wall of the lower sand mold is greater than the wall thickness of the front and rear transverse cavity walls, and the wall thickness of the right longitudinal cavity wall is also greater than the wall thickness of the front and rear transverse cavity walls. Therefore, the heat dissipation rate of the left and right longitudinal cavity walls is slower than that of the front and rear transverse cavity walls.
[0009] The first lower riser is disposed on the lower sand mold and supplies molten casting to the casting cavity from the side. The second upper riser channel is disposed on the upper sand mold and connects to the casting cavity from top to bottom. The interface between the second upper riser channel and the casting cavity is located on the upper surface of the casting cavity. Thus, the molten casting supplied to the inlet channel flows into the first lower riser, then flows into the casting cavity from the side. After filling the casting cavity, the molten casting is poured from bottom to top into the second upper riser channel.
[0010] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows: First, since the wall thickness of the left longitudinal cavity wall and the right longitudinal cavity wall of the lower sand mold is greater than the wall thickness of the front transverse cavity wall and the rear transverse cavity wall, the heat dissipation rate of the left longitudinal cavity wall and the right longitudinal cavity wall is slower than that of the front transverse cavity wall and the rear transverse cavity wall, resulting in a slower solidification rate of the casting portion close to the left longitudinal cavity wall and the right longitudinal cavity wall than that of the casting portion close to the front transverse cavity wall and the rear transverse cavity wall. Second, since the first lower riser recess is provided on the left longitudinal cavity wall, and a pair of second upper riser channels are provided on the wall of the upper sand mold located on the right side of the core, the first lower riser recess is located at the front end of the casting melt flow path, belonging to a hot riser with a higher temperature and stronger feeding capacity, while the second upper riser channel is located at the rear end of the casting melt flow path, belonging to a cold riser with a lower temperature and weaker feeding capacity. Providing a pair of second upper riser channels is beneficial to increasing the feeding capacity. This allows for timely replenishment of molten casting to the later-solidified casting portions close to the left and right longitudinal cavity walls via the first lower riser recess and the second upper riser channel, reducing defects such as shrinkage cavities and porosity in the cast wheel hub side mold. It is evident that simultaneously optimizing the sand mold wall thickness and riser structure can significantly improve the casting quality of the wheel hub side mold.
[0011] A further technical solution could be to provide an upper groove with its opening facing downwards on the bottom wall of the upper sand mold located on the left side of the core, with the first end of the upper groove connected to the liquid inlet channel; and a lower groove with its opening facing upwards on the top wall of the left longitudinal cavity, with the tail end of the lower groove connected to the first lower riser socket; when the upper and lower sand molds are closed together, the opening of the first end of the upper groove covers the top wall of the left longitudinal cavity, while the tail end is vertically connected to the opening of the lower groove, and the opening of the tail end of the lower groove covers the bottom wall of the upper sand mold; a filter screen is sandwiched between the tail end of the upper groove and the head end of the lower groove. This facilitates the manufacture of the upper and lower grooves, as well as the application of coatings to the upper and lower grooves before casting, and the installation of the filter screen. In addition, the tail end of the upper groove is connected to the head end of the lower groove, thus forming a transition port between the tail end of the upper groove and the head end of the lower groove. The area of the transition port is smaller than the groove area of the upper and lower grooves. When the casting molten liquid entering the upper groove passes through the transition port and the filter screen, the flow rate will not be lost too much. At the same time, the filter screen can be used to filter out impurities in the casting molten liquid.
[0012] A further technical solution could be to provide a recessed pit on the bottom wall of the first lower riser cavity, with the tail end of the lower groove connected to a cavity located above the recessed pit.
[0013] A further technical solution could be to provide a first upper riser channel on the wall of the upper sand mold located on the left side of the core, the first upper riser channel extending downwards through the bottom wall of the upper sand mold; when the upper sand mold and the lower sand mold are closed together, the first upper riser channel connects to the first lower riser socket; the first upper riser channel and the second upper riser channel extend upwards through the top wall of the upper sand mold respectively. In this way, venting is achieved using the first and second upper riser channels, preventing gas trapped in the casting during pouring from causing defects. Furthermore, after pouring, insulating material can be sprinkled onto the first and second upper riser channels to increase the riser temperature and enhance the feeding effect.
[0014] A further technical solution could be that the first lower riser socket is connected to the longitudinal center of the casting cavity. This can enhance the feeding effect.
[0015] A further technical solution could be to arrange a pair of second upper riser channels corresponding to the front and rear ends of the longitudinal direction of the casting cavity, respectively. This can enhance the feeding effect.
[0016] A further technical solution could include an inorganic sand core for forming cooling channels on the wheel hub side mold. Part of the inorganic sand core is inserted into the mold core, and part extends into the casting cavity. The main components of the inorganic sand core include sand particles and an inorganic binder that binds the sand particles together. Thus, the inorganic sand core is water-soluble. After sand casting and solidification of the casting, water can be passed into the cooling channels to easily dissolve the inorganic sand core, achieving a sand-cleaning effect.
[0017] A further technical solution could be to provide transverse wall recesses on the front and rear transverse cavity walls of the lower sand mold, respectively, which are adapted to the longitudinal cross-sectional contour of the corresponding casting cavity. Viewed longitudinally, the lower groove is located outside the transverse wall recesses, and the interface area between the second upper riser channel and the casting cavity is also located outside the transverse wall recesses. In this way, the wall thickness of the area where the transverse wall recesses are located is basically uniform, allowing the corresponding casting portion to cool and solidify uniformly. Furthermore, the lower groove and the interface area being located outside the transverse wall recesses can slow down the cooling and solidification rate of the molten casting in the lower groove and interface areas, enhancing the feeding effect.
[0018] A further technical solution could be to provide bottom wall recesses on the bottom wall of the lower sand mold that are adapted to the longitudinal cross-sectional profile of the corresponding casting cavity. In this way, the wall thickness of the area containing the bottom wall recesses is basically uniform, allowing the corresponding casting portion to cool and solidify evenly.
[0019] A further technical solution could be to provide an intermediate transition channel on the left longitudinal cavity wall, through which the first lower riser socket connects to the casting cavity; viewed from above, no bottom wall recess is provided on the bottom wall of the lower sand mold in the area corresponding to the intermediate transition channel. This slows down the cooling and solidification rate of the molten casting within the intermediate transition channel, thus enhancing its feeding effect.
[0020] Because of the above-mentioned features and advantages, this invention can be applied to the sand mold assembly for casting wheel hub side molds. Attached Figure Description
[0021] Figure 1 This is an exploded structural diagram of a sand mold assembly for casting wheel hub side molds using the technical solution of this invention.
[0022] Figure 2 This is a three-dimensional structural diagram of the upper sand mold 1;
[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the lower sand mold 2;
[0024] Figure 4This is a schematic diagram of the three-dimensional structure after the lower sand mold 2 has been flipped over;
[0025] Figure 5 This is a schematic diagram of the lower sand mold 2 viewed from the longitudinal direction;
[0026] Figure 6 This is a schematic diagram of the lower sand mold 2 as viewed from top to bottom;
[0027] Figure 7 This is a top view of the sand mold assembly.
[0028] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure along the AA direction;
[0029] Figure 9 yes Figure 7 The schematic diagram is obtained by rotating the cross-sectional structure in the BB direction by 90° clockwise. Detailed Implementation
[0030] The structure of the sand mold assembly for casting wheel hub side molds, which applies the technical solution of the present invention, will be further described below with reference to the accompanying drawings. Except where explicitly stated that they are equivalent or alternative embodiments, the various implementation details disclosed below can be selectively applied or combined in one embodiment, even if they are not directly related or synergistic in function.
[0031] like Figures 1-9As shown, a sand mold assembly for casting wheel hub side molds includes an upper sand mold 1 and a lower sand mold 2. A downwardly protruding core 11 is formed on the upper sand mold 1. The lower sand mold 2 is approximately bowl-shaped and includes a left longitudinal cavity wall 22, a right longitudinal cavity wall 21, a front transverse cavity wall 23, a rear transverse cavity wall 23a, and a cavity bottom wall 24. The left longitudinal cavity wall 22, right longitudinal cavity wall 21, front transverse cavity wall 23, rear transverse cavity wall 23a, and cavity bottom wall 24 form an upward-opening concave cavity 20. When the upper sand mold 1 and lower sand mold 2 are closed together, the core 11 is inserted into the concave cavity 20, forming a casting cavity 4 for casting wheel hub side molds between the inner wall of the concave cavity 20 and the outer wall of the core 11. The characteristic feature is that the wall thickness of the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 of the lower sand mold 2 is greater than that of the front transverse cavity wall 23a. The wall thickness of cavity wall 23 and rear transverse cavity wall 23a is such that a first lower riser socket 25 with an upward opening is provided on the left longitudinal cavity wall 22, and the first lower riser socket 25 is used to supply casting molten metal to the casting cavity 4; a liquid inlet channel 12 is provided on the wall of the upper sand mold 1 located to the left of the core 11, and a pair of second upper riser channels (14, 14a) are provided on the wall of the upper sand mold 1 located to the right of the core 11, and the pair of second upper riser channels (14, 14a) are respectively arranged in front and behind, and the pair of second upper riser channels (14, 14a) respectively penetrate downward through the bottom wall of the upper sand mold 1; when the upper sand mold 1 and the lower sand mold 2 are closed together, the liquid inlet channel 12 is used to supply casting molten metal to the first lower riser socket 25, and the second upper riser channels (14, 14a) connect to the casting cavity 4 and are used to supply casting molten metal to the casting cavity 4.
[0032] Specifically, the wall thickness of the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 of the lower sand mold 2 is greater than the wall thickness of the front transverse cavity wall 23 and the rear transverse cavity wall 23a. This means that the wall thickness T2 of the left longitudinal cavity wall 22 is greater than the wall thickness T3 of the front transverse cavity wall 23 and the wall thickness T4 of the rear transverse cavity wall 23a, and the wall thickness T1 of the right longitudinal cavity wall 21 is also greater than the wall thickness T3 of the front transverse cavity wall 23 and the wall thickness T4 of the rear transverse cavity wall 23a. Therefore, the heat dissipation rate of the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 is slower than that of the front transverse cavity wall 23 and the rear transverse cavity wall 23a.
[0033] The first lower riser socket 25 is disposed on the lower sand mold 2 and supplies molten casting to the casting cavity 4 from the side. The second upper riser channels (14, 14a) are disposed on the upper sand mold 1 and connect to the casting cavity 4 from top to bottom. The interface between the second upper riser channels (14, 14a) and the casting cavity 4 is located on the upper surface of the casting cavity 4. In this way, the molten casting delivered to the liquid inlet channel 12 flows into the first lower riser socket 25 and then flows into the casting cavity 4 from the side. After filling the casting cavity 4, the molten casting is poured from bottom to top into the second upper riser channels (14, 14a).
[0034] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows: First, since the wall thickness of the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 of the lower sand mold 2 is greater than the wall thickness of the front transverse cavity wall 23 and the rear transverse cavity wall 23a, the heat dissipation rate of the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 is slower than that of the front transverse cavity wall 23 and the rear transverse cavity wall 23a, so that the solidification rate of the casting part close to the left longitudinal cavity wall 22 and the right longitudinal cavity wall 21 is slower than that of the casting part close to the front transverse cavity wall 23 and the rear transverse cavity wall 23a. Secondly, since the first lower riser socket 25 is provided on the left longitudinal cavity wall 22, and a pair of second upper riser channels (14, 14a) are provided on the wall of the upper sand mold 1 located on the right side of the core 11, the first lower riser socket 25 is located at the front end of the casting molten flow path and is a hot riser with a higher temperature and stronger feeding capacity. The second upper riser channels (14, 14a) are located at the rear end of the casting molten flow path and are cold risers with a lower temperature and weaker feeding capacity. Providing a pair of second upper riser channels (14, 14a) helps increase the feeding capacity. Thus, the first lower riser socket 25 and the second upper riser channels (14, 14a) can be used to promptly replenish the casting molten material to the later-solidified casting portion close to the left longitudinal cavity wall 22 and right longitudinal cavity wall 21, reducing defects such as shrinkage cavities and porosity in the cast wheel hub side mold. It is evident that simultaneously optimizing the wall thickness of the sand mold and the riser structure can greatly improve the casting quality of the wheel hub side mold.
[0035] Furthermore, a pair of second upper riser channels (14, 14a) are arranged corresponding to the front and rear ends of the casting cavity 4 in the longitudinal direction, respectively. Notches (201, 202) are respectively provided on the walls at the front and rear ends in the transverse direction of the casting cavity 4. When the upper sand mold 1 and the lower sand mold 2 are closed together, the pair of second upper riser channels (14, 14a) are connected to the notches (201, 202) respectively, which can enhance the feeding effect.
[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, an upper groove 15 with its opening facing downwards is provided on the bottom wall of the upper sand mold 1, located on the left side of the core 11. The first end 151 of the upper groove 15 connects to the liquid inlet channel 12. A lower groove 26 with its opening facing upwards is provided on the top wall of the left longitudinal cavity wall 22. The tail end 262 of the lower groove 26 connects to the first lower riser socket 25. When the upper sand mold 1 and the lower sand mold 2 are closed together, the opening of the first end of the upper groove 15 covers the top wall of the left longitudinal cavity wall 22, while the tail end is vertically connected to the opening of the lower groove 26. The opening of the tail end of the lower groove 26 covers the bottom wall of the upper sand mold 1. A filter screen (not shown in the figure) is sandwiched between the tail end of the upper groove 15 and the opening end of the lower groove 26. This facilitates the manufacture of the upper groove 15 and the lower groove 26, as well as the application of paint to the upper groove 15 and the lower groove 26 before casting, and the installation of the filter screen. Furthermore, the tail end 152 of the upper groove 15 is vertically connected to the head end 261 of the lower groove 26, thus forming a transition opening between the tail end 152 of the upper groove 15 and the head end 261 of the lower groove 26. The area of the transition opening is smaller than the groove area of the upper groove 15 and the lower groove 26. When the casting molten metal entering the upper groove 15 passes through the transition opening and the filter screen, the flow rate will not be significantly reduced. At the same time, the filter screen can be used to filter out impurities in the casting molten metal. Further, a recessed pit 251 is provided on the bottom wall 24 of the first lower riser recess 25, and the tail end 262 of the lower groove 26 connects to a cavity located above the recessed pit 251.
[0037] like Figure 1 and Figure 8 As shown, a first upper riser channel 13 is provided on the wall of the upper sand mold 1 located on the left side of the core 11. The first upper riser channel 13 penetrates downward through the bottom wall of the upper sand mold 1. When the upper sand mold 1 and the lower sand mold 2 are closed together, the first upper riser channel 13 connects to the first lower riser socket 25. The first upper riser channel 13 and the second upper riser channels (14, 14a) penetrate upward through the top wall of the upper sand mold 1, respectively. In this way, the first upper riser channel 13 and the second upper riser channels (14, 14a) are used for venting, which avoids the gas trapped in the casting during casting and causing defects. In addition, after casting is completed, heat-insulating material can be sprinkled on the first upper riser channel 13 and the second upper riser channels (14, 14a) to increase the riser temperature and enhance the feeding effect.
[0038] like Figure 1 and Figure 2As shown, it also includes an inorganic sand core 3 for forming cooling channels on the wheel hub side mold. A portion of the inorganic sand core 3 is inserted into the core 11, and a portion extends into the casting cavity 4. In this embodiment, a pair of insertion holes (110, 110a) are provided on the core 11. The inorganic sand core 3 includes a main body 30 and connecting portions (31, 32) located at both ends of the main body 30. The connecting portions (31, 32) are respectively inserted into the insertion holes (110, 110a), and the main body 30 extends into the casting cavity 4. The main components of the inorganic sand core include sand particles and an inorganic binder that binds the sand particles together. Thus, the inorganic sand core is water-soluble. After sand casting and solidification of the casting, water is passed into the cooling channels to easily dissolve the inorganic sand core 3, achieving a sand-cleaning effect.
[0039] like Figure 1 , Figure 2 and Figure 4 As shown, transverse wall recesses (27, 27a) adapted to the longitudinal cross-sectional contour of the corresponding casting cavity are respectively provided on the front transverse cavity wall 23 and the rear transverse cavity wall 23a of the lower sand mold 2. Looking longitudinally, the lower groove 26 is located outside the transverse wall recesses (27, 27a), and the interface area 5 between the second upper riser channel (14, 14a) and the casting cavity 4 is also located outside the transverse wall recesses (27, 27a). Thus, the wall thickness of the area where the transverse wall recesses (27, 27a) are located is basically uniform, allowing the corresponding casting part to cool and solidify uniformly. Furthermore, the lower groove 26 and the interface area 5 being located outside the transverse wall recesses (27, 27a) slows down the cooling and solidification rate of the casting molten metal within the lower groove 26 and the interface area 5, enhancing the feeding effect.
[0040] like Figure 5 , Figure 6 and Figure 7 As shown, a bottom wall recess 271, adapted to the longitudinal cross-sectional profile of the corresponding casting cavity, is provided on the bottom wall 24 of the lower sand mold 2. This ensures that the wall thickness of the area containing the bottom wall recess 271 is essentially uniform, allowing the corresponding casting portion to cool and solidify evenly. An intermediate transition channel 29 is provided on the left longitudinal cavity wall 22, through which the first lower riser socket 25 connects to the casting cavity 4. Furthermore, the first lower riser socket 25 connects to the longitudinal center of the casting cavity 4 via the intermediate transition channel 29. Viewed from above, the bottom wall recess 271 is not provided in the area 241 of the bottom wall 24 of the lower sand mold 2 corresponding to the intermediate transition channel 29. This slows down the cooling and solidification rate of the molten casting within the intermediate transition channel 29, enhancing its feeding effect.
Claims
1. A sand mold assembly for casting wheel hub side molds, the sand mold assembly comprising an upper sand mold and a lower sand mold, wherein a downwardly protruding core is formed on the upper sand mold, and the lower sand mold is approximately bowl-shaped and includes a left longitudinal cavity wall, a right longitudinal cavity wall, a front transverse cavity wall, a rear transverse cavity wall, and a cavity bottom wall, wherein the left longitudinal cavity wall, the right longitudinal cavity wall, the front transverse cavity wall, the rear transverse cavity wall, and the cavity bottom wall form an upward-opening concave cavity; when the upper sand mold and the lower sand mold are closed together, the core is inserted into the concave cavity, and a casting cavity for casting wheel hub side molds is formed between the inner wall of the concave cavity and the outer wall of the core; characterized in that, The left and right longitudinal cavity walls of the lower sand mold are thicker than the front and rear transverse cavity walls. A first lower riser socket with an upward opening is provided on the left longitudinal cavity wall. The first lower riser socket is used to supply casting molten metal to the casting cavity. A liquid inlet channel is provided on the wall of the upper sand mold located to the left of the core. A pair of second upper riser channels, positioned front and rear, are provided on the wall of the upper sand mold located to the right of the core. The pair of second upper riser channels penetrate downward through the bottom wall of the upper sand mold. When the upper and lower sand molds are closed together, the liquid inlet channel is used to supply casting molten metal to the first lower riser socket, and the second upper riser channels connect to the casting cavity and are used to supply casting molten metal to the casting cavity. An upper groove with its opening facing downwards is provided on the bottom wall of the upper sand mold located on the left side of the core. The first end of the upper groove is connected to the liquid inlet channel. A lower groove with its opening facing upwards is provided on the top wall of the left longitudinal cavity wall. The tail end of the lower groove is connected to the first lower riser socket. When the upper sand mold and the lower sand mold are closed together, the opening of the first end of the upper groove covers the top wall of the left longitudinal cavity wall, and the tail end is vertically connected to the opening of the lower groove. The opening of the tail end of the lower groove covers the bottom wall of the upper sand mold. A filter screen is sandwiched between the tail end of the upper groove and the opening end of the lower groove.
2. The sand mo(u)ld assembly for casting wheel hub side mo(u)ld(s) according to claim 1, characterized in that, A recessed groove is provided on the bottom wall of the cavity of the first lower riser pit, and the tail end of the lower groove is connected to the cavity located above the recessed groove.
3. The sand mold assembly for casting wheel hub side molds according to claim 1 or 2, characterized in that, A first upper riser channel is provided on the wall of the upper sand mold located on the left side of the core. The first upper riser channel penetrates downward through the bottom wall of the upper sand mold. When the upper sand mold and the lower sand mold are closed together, the first upper riser channel connects with the first lower riser socket. The first upper riser channel and the second upper riser channel penetrate upward through the top wall of the upper sand mold.
4. A sand mo(u)ld assembly for casting a wheel side mo(u)ld according to claim 1 or 2, c h a r a c t e r i z e d in that The first lower riser socket is located at the longitudinal center of the casting cavity.
5. A sand mo(u)ld assembly for casting a wheel side mo(u)ld according to claim 1 or 2, c h a r a c t e r i z e d in that A pair of second upper riser channels are arranged corresponding to the front and rear ends of the longitudinal direction of the casting cavity, respectively.
6. The sand mold assembly for casting wheel hub side molds according to claim 1 or 2, characterized in that, It also includes an inorganic sand core for forming cooling channels on the wheel hub side mold, a portion of which is inserted into the core and a portion extends into the casting cavity.
7. The sand mold assembly for casting wheel hub side molds according to claim 1, characterized in that, The front and rear transverse cavity walls of the lower sand mold are respectively provided with transverse wall recesses that are adapted to the longitudinal cross-sectional contour of the corresponding casting cavity; viewed in the longitudinal direction, the lower groove is located outside the transverse wall recesses, and the interface area between the second upper riser channel and the casting cavity is also located outside the transverse wall recesses.
8. The sand mo(u)ld assembly for casting wheel hub side mo(u)ld(s) according to claim 7, characterized in that, A bottom wall recess is provided on the bottom wall of the lower sand mold cavity, which is adapted to the longitudinal cross-sectional profile of the corresponding casting cavity.
9. The sand mo(u)ld assembly for casting wheel hub side mo(u)ld(s) according to claim 8, characterized in that, An intermediate transition channel is provided on the left longitudinal cavity wall, and the first lower riser socket is connected to the casting cavity through the intermediate transition channel; viewed from above, the bottom wall recess is not provided in the area corresponding to the intermediate transition channel on the bottom wall of the lower sand mold cavity.