3D printing sand mold structure for supercharger shell casting

Abstract

The utility model relates to the technical field of casting sand molds, in particular to a 3D (three-dimensional) printing sand mold structure for casting a supercharger shell, which comprises an upper sand mold, a middle sand mold, a lower sand mold and a movable block, the middle sand mold comprises a sand core, a base, reinforcing ribs and a support column, the upper sand mold, the sand core and the lower sand mold are sequentially buckled from top to bottom to form an integral sand mold, and the movable block is arranged on the upper sand mold. A casting cavity similar to a supercharger shell to be cast in shape is reserved in the integral sand mold, an exhaust hole communicated with the interior of the casting cavity is formed in the upper sand mold, a sand cleaning opening matched with the movable block is formed in the lower portion of the bottom of the lower sand mold, and the movable block is embedded in the sand cleaning opening in a matched mode in the mode that the movable block can be taken out. The parting structure design, the sand core 3D printing mode and the sand cleaning opening movable block are adopted, the air suffocation problem in casting and later sand cleaning work are solved, auxiliary supporting of the base, the reinforcing ribs and the supporting columns for the printing sand core is added, the risk of sand core deformation is eliminated, and the casting efficiency and the casting quality are guaranteed advantageously.

Description

Technical Field

[0001] This utility model belongs to the field of casting sand mold technology, specifically relating to a 3D printed sand mold structure for casting turbocharger housings. Background Technology

[0002] Sand casting is a casting method suitable for producing castings from steel, iron, and most non-ferrous alloys in sand molds. Sand casting uses inexpensive and readily available molding materials, and mold making is simple. It is suitable for single-piece production, batch production, and mass production of castings, and is also applicable to turbocharger housing casting. However, due to the irregular shape, numerous curved surfaces, and large size of turbocharger housing castings, the 3D printing sand casting process is commonly used in the production of turbocharger housing castings. Existing 3D printed sand molds for turbocharger housing casting carry the risk of sand mold deformation during the printing and baking processes, as well as problems such as air trapping during pouring, which can affect the casting quality of the turbocharger housing. Utility Model Content

[0003] In response to the above situation, in order to facilitate production, ensure the dimensions of sand molds and castings, and ensure the quality of turbocharger housing castings, this utility model provides a 3D printed sand mold structure for turbocharger housing casting, which involves the design of the sand mold parting structure during the casting process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A 3D-printed sand mold structure for casting turbocharger housings includes an upper sand mold, a middle sand mold, a lower sand mold, and a movable block. The middle sand mold includes a sand core. The upper sand mold, sand core, and lower sand mold are sequentially interlocked from top to bottom to form an integral sand mold. The interior of the integral sand mold has a casting cavity that resembles the shape of the turbocharger housing to be cast. The upper sand mold has an exhaust hole that communicates with the interior of the casting cavity. The bottom of the lower sand mold has a sand cleaning port that matches the movable block. The movable block is removably fitted and inserted into the sand cleaning port.

[0006] Furthermore, the upper surface of the upper sand mold is evenly provided with several vent holes to facilitate the discharge of gas inside the casting cavity during the casting process, so as to avoid the problem of gas stagnation during casting.

[0007] Furthermore, the sand-cleaning port is a groove-shaped structure that matches the shape of the movable block. The bottom of the sand-cleaning port has a sand-cleaning hole that communicates with the inside of the casting cavity, which facilitates the sand-cleaning work in the later stage of casting. However, during the casting process, the movable block is needed to temporarily block the sand-cleaning hole to prevent the casting liquid from flowing out.

[0008] Furthermore, the intermediate sand mold also includes a base, and the intermediate sand mold is a 3D printed sand mold. In order to ensure the strength of the sand core of the intermediate sand mold and to ensure that the sand core does not deform during the printing process and subsequent placement and baking process, the edges and the lower center of the sand core are respectively supported on the base by multiple edge reinforcing ribs and intermediate support columns. When the sand core is fastened and assembled with the upper and lower sand molds, the base and intermediate support columns need to be cut off and separated from the sand core in advance, then the sand core is placed on the lower sand mold, and then the upper and lower sand molds are fastened and assembled together to form a complete integral sand mold. Then the integral sand mold can be placed on the sand box of the low-pressure casting machine and sealed, and then the casting can begin.

[0009] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as low-pressure casting machines and their sand boxes, all adopt existing technologies in the field.

[0010] The beneficial effects of this utility model are as follows:

[0011] This utility model provides a 3D-printed sand mold structure for turbocharger housing casting. It adopts a split structure design of upper sand mold, middle sand mold, and lower sand mold. Several vent holes are opened on the casting cavity to avoid air trapping during the casting process. The bottom of the lower sand mold is equipped with a sand cleaning port and a movable block to facilitate the later sand cleaning work. This helps to ensure the casting efficiency and casting quality of the turbocharger housing casting. Furthermore, the sand core of the middle sand mold is 3D printed. During the printing and baking process, an auxiliary support base, reinforcing ribs, and support columns are added, which can effectively eliminate the risk of sand mold deformation in the prior art and ensure the casting quality of the turbocharger housing casting. Attached Figure Description

[0012] Figure 1 a and b are modeling diagrams of the front and back views of the 3D printed sand mold structure in the embodiment, respectively.

[0013] Figure 2 a and b are modeling diagrams of the front and back views of the lower sand mold structure in the embodiment, respectively.

[0014] Figure 3 a and b are modeling diagrams of the 3D printed sand mold structure from the top and bottom flipping perspectives, respectively, in the embodiment.

[0015] Figure 4 This is a modeling diagram of the movable block of the 3D printed sand mold structure in the embodiment.

[0016] Figure 5 This is a reverse-view modeling diagram of the live block after it has been embedded into the sand cleaning port of the lower sand mold in the embodiment.

[0017] Figure 6 This is a frontal view modeling diagram of the live block after it has been embedded into the sand cleaning port of the lower sand mold in the embodiment.

[0018] Figure 7 This is a modeling diagram of the sand core after the sand mold base and intermediate support column are removed in the embodiment.

[0019] Figure 8 This is a frontal view modeling diagram of the sand core and movable block after they have been assembled onto the lower sand mold in the embodiment.

[0020] Figure 9 This is a modeling diagram of the overall sand mold after the upper sand mold, sand core, and lower sand mold are joined together in the embodiment. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0022] It should be noted that the terms "upper", "lower", "inner", "outer", "positive", and "negative" indicate directions or positional relationships based on the attached drawings and are used only for ease of description.

[0023] Example

[0024] See 1a and 1b. Figure 2 a, b, Figure 3 a, b and Figure 4 A 3D-printed sand mold structure for turbocharger housing casting includes an upper sand mold 1, a middle sand mold, a lower sand mold 2, and a movable block 4, as shown below. Figure 3 As shown in a and b, the medium sand mold includes a sand core 3 and a base 5. The medium sand mold is a 3D printed sand mold. During the printing process, the edge of the sand core and its lower center are respectively supported on the base by multiple edge reinforcing ribs 6 and a central support column 7.

[0025] like Figure 5-9 As shown, when the sand core is assembled with the upper and lower sand molds, the base and intermediate support column must be pre-cut and separated from the sand core. The sand core is then placed on the lower sand mold, and the upper and lower sand molds are then assembled together. The upper sand mold, sand core, and lower sand mold are sequentially assembled from top to bottom to form a single sand mold. This single sand mold is then placed on the sand box (not shown in the figure) of the low-pressure casting machine (not shown) and sealed. Then, preparation for casting can begin. The low-pressure casting machine and its sand box utilize existing technology; their specific configuration will not be detailed here.

[0026] The integral sand mold has a casting cavity inside that is similar in shape to the turbocharger housing to be cast. The upper surface of the upper sand mold has a rectangular array of several vent holes 8 that are connected to the inside of the casting cavity, so as to facilitate the discharge of gas inside the casting cavity during the casting process and avoid the problem of gas blockage during casting.

[0027] The bottom of the lower sand mold has a groove-shaped cleaning port 9 that matches the shape of the movable block. The bottom of the groove of the cleaning port has a cleaning hole 10 that communicates with the inside of the casting cavity. The movable block can be removed and fitted into the inside of the cleaning port. During the casting process, the movable block is needed to temporarily block the cleaning hole to prevent the casting liquid from flowing out.

[0028] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A 3D-printed sand mold structure for casting turbocharger housings, characterized in that: The system includes an upper sand mold, a middle sand mold, a lower sand mold, and a movable block. The middle sand mold includes a sand core. The upper sand mold, sand core, and lower sand mold are sequentially interlocked from top to bottom to form an integral sand mold. The interior of the integral sand mold has a casting cavity that resembles the shape of the turbocharger housing to be cast. The upper sand mold has an exhaust hole that communicates with the interior of the casting cavity. The bottom of the lower sand mold has a sand cleaning port that matches the movable block. The movable block can be removed and fitted into the interior of the sand cleaning port.

2. The 3D-printed sand mold structure for turbocharger housing casting according to claim 1, characterized in that: The upper surface of the upper sand mold is evenly provided with several vent holes.

3. The 3D-printed sand mold structure for turbocharger housing casting according to claim 1, characterized in that: The sand cleaning port is a groove-shaped structure that matches the shape of the movable block, and a sand cleaning hole is provided at the bottom of the groove of the sand cleaning port.

4. The 3D-printed sand mold structure for turbocharger housing casting according to claim 1, characterized in that: The medium sand mold also includes a base, and the medium sand mold is a 3D printed sand mold; during the printing process, the edge of the sand core and its lower center are respectively supported on the base by multiple edge reinforcing ribs and a central support column.

5. A 3D-printed sand mold structure for turbocharger housing casting according to claim 4, characterized in that: When the sand core is assembled with the upper and lower sand molds, the base and intermediate support column must be cut off and separated from the sand core beforehand.

Images