A sand sleeve and mold for casting housing

Abstract

This utility model relates to the field of metal mold casting, specifically to a sand sleeve for a casting shell, comprising a main body and a positioning component. The main body is an annular body with one end being an annular surface and the outer surface being a cylindrical surface. The inner surface matches the shape of the outer surface of the flange back cylinder that cannot be directly demolded from the casting. The outer surface and the inner surface intersect at an edge. The positioning component is positioned along the axial direction of the main body, with one end located on the upper side of the annular body and the other end extending beyond the main body, matching the shape of the upper outer side of the casting cylinder. The sand sleeve for the casting shell is guided and slid into the mold by the positioning component and positioned thereon. By setting and lifting the positioning component, the sand sleeve positioning component can be placed into the matching position on the mold parting surface and slid to the corresponding position for installation, eliminating the need for hands to enter the mold cavity to place the sand sleeve and avoiding high-temperature burns. After the mold is closed, the other half of the mold limits the positioning component of the sand sleeve, preventing the sand sleeve from shifting during mold closing and pouring, thus avoiding the problem of insufficient casting material.

Description

Technical Field

[0001] This utility model relates to the field of metal mold casting, specifically to a sand sleeve for casting shells. Background Technology

[0002] Aluminum alloy casting shells are widely manufactured using metal mold low-pressure casting technology, while some high-voltage electrical aluminum alloy casting shells with mutually perpendicular flanged support structures are usually produced using sand mold low-pressure casting technology with horizontally placed castings.

[0003] Compared to metal mold low-pressure casting, sand casting produces castings with lower mechanical properties, worse appearance quality, higher production cost per piece, and lower production efficiency.

[0004] When castings with mutually perpendicular flanged support cylinders are produced using low-pressure metal mold casting, one flange face perpendicular to the cylinder axis serves as the parting surface for the left and right molds. The other flange remains completely within the mold half, preventing direct demolding. To achieve demolding, a movable block or sand sleeve is required. Manually placing the movable block within the parting surface of the mold half is difficult and carries a high risk of burns. Furthermore, during mold closing or pouring, the movable block may shift, causing incomplete casting. Similarly, when using a sand sleeve, it may shift, also resulting in incomplete casting.

[0005] Existing metal molds are designed with a bottom mold plate, left mold plate, and right mold plate to facilitate mold closing and opening. However, these molds still require manual insertion into the cavity, which may result in burns. Furthermore, existing sand sleeves lack anti-slip structures, which could cause them to slip out during mold closing or pouring, leading to incomplete casting. Utility Model Content

[0006] To avoid burns caused by manual placement and to prevent sand sleeve displacement during mold closing or pouring, this utility model proposes a casting shell sand sleeve, which solves the problem of burns caused by manual placement into the cavity and the problem of missing material in the cast casting caused by sand sleeve displacement during mold closing or pouring.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] Firstly, this utility model proposes a sand sleeve for a casting shell, comprising a main body and a positioning component. The main body is an annular body with one end being an annular surface and the outer surface being a cylindrical surface. The inner surface matches the shape of the outer surface of the flange back cylinder that cannot be directly demolded from the casting. The outer surface and the inner surface intersect at an edge. The positioning component is positioned along the axial direction of the main body, with one end located on the upper side of the annular body and the other end extending beyond the main body, matching the shape of the upper outer side of the casting cylinder. The sand sleeve for the casting shell is guided and slid into and positioned on the mold by the positioning component. By setting the positioning component, the sand sleeve positioning component can be placed in the matching position on the mold parting surface and slid to the corresponding position to achieve installation, eliminating the need for hands to enter the mold cavity to place the sand sleeve and avoiding high-temperature burns.

[0009] In one possible embodiment, the outer diameter of the main component is greater than or equal to the outer diameter of the flange of the casting at that location, the inner diameter is the same as the inner diameter of the flange back of the casting, and the end face of the main component is an annular surface, which is used to form the flange back during casting.

[0010] In one possible embodiment, the draft angle of the outer surface of the main component is no greater than -1°. The vertical surface is not conducive to the guiding insertion of the sand sleeve and the demolding of the mold. Setting the above-mentioned draft angle facilitates the guiding insertion of the sand sleeve and the demolding of the mold.

[0011] In one possible embodiment, the positioning component includes a vertical positioning component and a horizontal positioning component. One end of the vertical positioning component is located on the upper side of the annular body, and the other end extends beyond the main body component, matching the shape of the upper outer side of the casting cylinder. When the casting shell sand sleeve is fitted together with the casting, the vertical positioning component extends from one end of the annular body to the surface of the casting cylinder and the mold parting surface; the horizontal positioning component is located on the vertical positioning component and extends to terminate at the mold parting surface. This structure, along with the correspondingly shaped cavity on the mold, facilitates the insertion of the positioning component from the parting surface without requiring hands to enter the mold cavity for sand sleeve placement, avoiding high-temperature burns; it allows the positioning component to be inserted into the matching position on the mold parting surface and slide to the corresponding position, facilitating installation. Furthermore, it acts as a limit during the mold closing and pouring process, preventing slippage.

[0012] In one possible embodiment, the vertical positioning component is located at the position of maximum height on the outer wall of the annulus, with a width of not less than 40mm to ensure sufficient strength.

[0013] In one possible embodiment, the vertical positioning component is plate-shaped, with its bottom shape matching the shape of the upper side of the annulus and the outer side of the casting cylinder, and its top shape matching the shape of the horizontal positioning component. The plate-shaped structure facilitates the insertion of the positioning component from the parting surface.

[0014] In one possible embodiment, the lateral positioning component is plate-shaped, with an end face length of not less than 70mm and a height of not less than 40mm to ensure sufficient strength. The minimum distance between it and the casting is not less than 20mm, leaving a certain thickness for the mold so as not to significantly affect the mold life.

[0015] In one possible embodiment, the positioning component is perpendicular to the mold parting surface, and the draft angle is no greater than -1°, which facilitates the installation of the sand sleeve in the mold and its sliding to the corresponding position in the mold.

[0016] On the other hand, this utility model provides a mold, including a left mold and a right mold, wherein the aforementioned casting shell sand sleeve is positioned on the left mold or the right mold by a positioning component. The mold has a shape that matches the casting shell sand sleeve involved in the first aspect. After the mold is closed, the parting surface of the other mold limits the sand sleeve, which can solve the problem of missing material in the casting caused by displacement during the mold closing and pouring process, and can also solve the problems of difficult sand sleeve installation and unsafe operation.

[0017] In one possible embodiment, the left or right mold has a cavity that matches the shape of the sand sleeve of the casting shell. There is a clearance between the main body and positioning components and the mold. The left or right mold has an outward-facing limiting step corresponding to the flange back position of the casting. This further limits the overall positioning of the sand sleeve flange back. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the shell part blank according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the main body and positioning components of an embodiment of the present utility model;

[0021] Figure 3 This is another schematic diagram of the main body and positioning components of this utility model embodiment;

[0022] Figure 4 This is a schematic diagram of casting A and sand sleeve being matched together in the low-pressure casting process of the metal mold according to an embodiment of the present invention;

[0023] Figure 5 This is a diagram of the left mold before the sand jacket is installed, according to an embodiment of this utility model.

[0024] Figure 6 This is a diagram showing the state of the left mold after the sand jacket is installed according to an embodiment of this utility model;

[0025] Figure 7 yes Figure 6 A cross-sectional view of the mold cut perpendicular to the parting line;

[0026] Figure 8 This is a diagram showing the state of the left mold after the sand core is installed according to an embodiment of this utility model;

[0027] Figure 9 This is a schematic diagram of the metal mold low-pressure casting process of this utility model, showing the casting A with sand core removed after pouring;

[0028] The reference numerals in the attached drawings are as follows: 1-cast shell sand sleeve, 11-main body component, 12-positioning component, 121-vertical positioning component, 122-lateral positioning component, A-casting, 2-bottom mold, 3-left mold, 31-flange receiving cavity, 32-positioning component receiving cavity, 33-limiting step, 4-sand core. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0030] Metal mold casting has significant advantages over sand casting, including significantly improved mechanical properties of castings, superior appearance quality, and substantial reduction in production costs. Metal casting shells, such as aluminum alloy casting shells, are widely manufactured using metal mold low-pressure casting technology.

[0031] When castings with mutually perpendicular flanged support structures are produced using low-pressure metal mold casting, one flange face perpendicular to the main cylinder axis serves as the parting surface for the left and right molds. The other flange remains completely within the mold half and cannot be directly demolded. To achieve proper demolding, the mold portion on the back of the flange requires a movable block or sand sleeve. When using a movable block, it is typically divided into four pieces for easy removal from the casting. Each movable block is heavy, and the blocks and mold are at high temperatures, making manual placement within the parting surface difficult and posing a high risk of burns. Furthermore, during mold closing or pouring, the movable block may shift, resulting in incomplete casting. Similarly, using a sand sleeve presents the same challenges: placing it within the parting surface is difficult, posing a high risk of burns, and the sand sleeve may shift during mold closing or pouring, also leading to incomplete casting.

[0032] Existing metal molds utilize a structured bottom mold, left mold, and right mold to facilitate mold closing and opening. They also incorporate a flange sand core, installed within the left mold, allowing the flange to be formed directly through pouring. While this reduces the number of parting surfaces and mold pieces compared to sand molds, existing sand sleeves lack additional positioning structures beyond their outer circumference, requiring manual insertion into the cavity and potentially causing burns. Furthermore, the absence of an anti-slip mechanism for the sand sleeve allows it to slip out during mold closing and pouring, potentially resulting in incomplete casting.

[0033] Figure 1 The shell casting blank involved in the sand jacket example is casting A with a main cylinder having mutually perpendicular and flanged support structure.

[0034] like Figure 2 , 3 As shown, this embodiment proposes a casting shell sand sleeve 1, which can be made of resin sand. It includes a main body 11 and a positioning component 12. The main body 11 is an annular body with one end being an annular surface and the outer surface being a cylindrical surface. The inner surface matches the shape of the outer surface of the flange back cylinder of casting A, which cannot be directly demolded. The outer and inner surfaces intersect at an edge. The positioning component 12 is positioned along the axial direction of the main body, with one end located on the upper side of the annular body and the other end extending beyond the main body, matching the shape of the upper outer side of the casting A cylinder. The casting shell sand sleeve 1 is positioned on the mold by the positioning component 12. By setting the positioning component 12, the casting shell sand sleeve 1 can be placed into the matching position on the mold parting surface and slid to the corresponding position for installation. This eliminates the need for hands to enter the mold cavity to place the sand sleeve, avoiding burns from high temperatures.

[0035] The casting housing can be an aluminum alloy housing. The casting housing in this embodiment can be applied to high-voltage electrical housings or other fields. The casting housing sand sleeve 1 is made of resin sand and can be manufactured using 3D printing technology. It can be integral, with the end face of the main component 11 being an annular surface, which is used to form the back of the flange during casting.

[0036] In some embodiments, the outer diameter of the main component 11 is greater than or equal to the outer diameter of the flange of the casting A at that location by 2 mm, and the inner diameter is the same as the inner diameter of the flange back of the casting A.

[0037] In some embodiments, the draft angle of the outer surface of the main component 11 is no greater than -1°. The vertical surface is not conducive to installation and demolding. Setting the above-mentioned draft angle facilitates the installation of the sand sleeve and demolding after the casting is completed.

[0038] The outer surface of the main component 11 is formed by stretching the back of the flange with an outer diameter greater than or equal to 2 mm from the outer diameter of casting A, with a draft angle not greater than -1°, terminating at the outer surface of casting A, forming an outer circumference. The outer surface has a conical structure. A schematic diagram of casting A and the sand sleeve mating in the low-pressure metal mold casting process is shown below. Figure 4 As shown, the outer surface of the main component 11 intersects with the casting A cylinder at the edge, and the inner surface of the main component 11 is the outer surface of the casting A cylinder surrounded by a conical structure surface.

[0039] In some embodiments, such as Figure 2 , 3 As shown, the positioning component 12 includes a vertical positioning component 121 and a horizontal positioning component 122. One end of the vertical positioning component 121 is located on the upper side of the annular body, and the other end extends beyond the main component 11, matching the shape of the upper outer side of the casting A cylinder. When the casting shell sand sleeve 1 is matched with the casting A, the vertical positioning component 121 extends from one end of the upper side of the annular body to the surface of the casting A cylinder and the mold parting surface. The horizontal positioning component 122 is located on the vertical positioning component 121. A portion of the vertical positioning component 121 extends to the surface of the casting A cylinder to form the inner surface of the casting A, and another portion extends to the mold parting surface. The horizontal positioning component 122 extends from the upper end face of the annular body to the mold parting surface, facilitating the placement of the positioning component 12 from the parting surface. During the mold closing and pouring process, it plays a limiting role, preventing slippage. A cavity of a corresponding shape is provided on the mold, which, in conjunction with the above structure, allows the positioning component 12 to be placed into the matching position on the mold parting surface and slide to the corresponding position, thus achieving installation.

[0040] As one implementation method, the positioning component 12 can be a T-shaped structure, with one end of the T-shaped structure on the same plane as the annular body. Alternatively, it can be on a different plane from the end face of the annular body.

[0041] In some embodiments, the vertical positioning component 121 is located at the position of maximum height on the outer wall of the annulus, with a width of not less than 40 mm, to ensure sufficient strength.

[0042] In some embodiments, the vertical positioning component 121 may be plate-shaped, i.e., a vertical plate, with its bottom shape matching the shape of the upper side of the annulus and the outer side of the casting A cylinder, and its top shape matching the shape of the horizontal positioning component 122. The plate-shaped structure facilitates the insertion of the positioning component from the parting surface. A portion of the vertical plate extends to the surface of the casting A, i.e., the surface in contact with the surface of the casting A, to form the outer surface of the casting A, and the remaining portion extends to the mold parting surface.

[0043] In some embodiments, the lateral positioning component 122 can be plate-shaped to serve as a suspension element; of course, it can also be other shapes that achieve the suspension effect. The end face length of the suspension plate is not less than 70mm, and the height is not less than 40mm to ensure sufficient strength. The minimum distance between the suspension plate and the casting is not less than 20mm to allow for sufficient thickness in the mold and not significantly affect the mold's lifespan.

[0044] The suspension plate extends to the parting surface, which facilitates the insertion of the T-shaped positioning component from the mold parting surface and plays a limiting role during the mold closing and pouring process, preventing it from slipping out.

[0045] In some embodiments, the T-shaped structure is perpendicular to the parting surface and stretched toward the parting surface, with a draft angle of no more than -1°, which facilitates the installation of the sand sleeve in the mold and its sliding to the corresponding position in the mold.

[0046] The embodiment also provides a mold, including a left mold 3 and a right mold. The aforementioned casting shell sand sleeve 1 is positioned on the left mold 3 or the right mold by a positioning component 12 and the outer surface of the main component 11. This mold has a shape that matches the casting shell sand sleeve 1. After mold closing, the parting surface of the other mold limits the sand sleeve positioning component 12, preventing the sand sleeve from shifting during mold closing and pouring, thus avoiding casting defects. This solves the problem of casting defects caused by shifting during mold closing and pouring, and also addresses the issues of difficult sand sleeve installation and unsafe operation. In actual operation, a positioning structure matching the shape of the sand sleeve can be selected on either the left mold 3 or the right mold.

[0047] In some embodiments, such as Figure 5 , 6 As shown in Figure 7, a low-pressure casting process mold for high-voltage electrical housings includes a sand sleeve 1, a bottom mold 2, a left mold 3, a right mold, and a sand core 4. The sand sleeve 1, bottom mold 2, left mold 3, right mold, and sand core 4 form the casting cavity. The left mold 3 and right mold are mounted on the bottom mold 2. The main cylinder has a mutually perpendicular flanged support structure. This type of metal mold structure allows for smooth mold opening.

[0048] In some embodiments, the left mold 3 or the right mold is provided with a flange receiving cavity 31 and a positioning component receiving cavity 32 that match the shape of the casting shell sand sleeve 1. There is a fitting gap between the main body component 11, the positioning component 12 and the mold. For example, the fitting gap between the main body component 11 and the flange receiving cavity 31 is less than or equal to 0.5 mm, and the fitting gap between the positioning component 12 and the positioning component receiving cavity 32 is less than or equal to 1 mm.

[0049] like Figure 5 , 7 As shown, the left mold 3 or the right mold flange has a limiting step 33 with a diameter greater than or equal to 1.5 mm on the back side of the flange, which is used to further limit the overall back side of the flange.

[0050] In some embodiments, taking the example of setting a cavity on the left mold 3 to mate with the sand sleeve 1 of the casting shell, one method of operation of the metal mold low-pressure casting process is as follows:

[0051] 1. Open the left mold 3 and the right mold.

[0052] 2. Insert the positioning component 12 of the casting shell sand sleeve 1 into the positioning component receiving cavity 32 of the left mold 3, and slide it until it is blocked. Figure 6 , 7 As shown.

[0053] 3. Lower sand core 4, and assemble the left mold, as follows. Figure 8 As shown.

[0054] 4. Combine the left mold and the right mold.

[0055] 5. Pouring.

[0056] 6. After pouring, open the left mold 3 and the right mold. Use an iron chain to lift the flanges on both sides of the main cylinder and pull out casting A, which includes the casting shell sand sleeve 1 and sand core 4. Figure 9 As shown.

[0057] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A foundry shell sand jacket, characterized by: It includes a main body and a positioning component. The main body is a ring with one end being a ring surface and the outer surface being a cylindrical surface. The inner surface matches the shape of the outer surface of the flange back cylinder that cannot be directly demolded from the casting. The outer surface and the inner surface intersect at the edge. The positioning component is positioned in the same direction as the axial direction of the main body. One end is located on the upper side of the ring, and the other end extends beyond the main body and matches the shape of the upper outer side of the casting cylinder. The casting shell sand sleeve is guided and slid into the mold by the positioning component and positioned on the mold.

2. The shell sand jacket of claim 1, wherein: The outer diameter of the main component is greater than or equal to the outer diameter of the flange of the casting at that location, and the inner diameter is the same as the inner diameter of the flange back of the casting.

3. The shell sand jacket of claim 1, wherein: The draft angle of the outer surface of the main component shall not exceed -1°.

4. The shell sand jacket of claim 1, wherein: The positioning components include a vertical positioning component and a horizontal positioning component. One end of the vertical positioning component is located on the upper side of the annular body, and the other end extends beyond the main body component, matching the shape of the upper outer side of the casting cylinder. When the casting shell sand sleeve is matched with the casting, the vertical positioning component extends from one end of the annular body to the surface of the casting cylinder and the mold parting surface. The horizontal positioning component is located on the vertical positioning component and extends to the mold parting surface.

5. The sand sleeve for the casting housing according to claim 4, characterized in that: The vertical positioning component is located at the maximum height of the outer wall of the ring, and its width is not less than 40mm.

6. The shell sand jacket of claim 4, wherein: The vertical positioning component is plate-shaped, with its bottom shape matching the shape of the upper side of the annular body and the outer side of the casting cylinder, and its top shape matching the shape of the horizontal positioning component.

7. The shell sand jacket of claim 4 wherein: The transverse positioning component is plate-shaped, with its end face located on the upper side of the main component having a length of not less than 70mm, a height of not less than 40mm, and a minimum distance of not less than 20mm from the casting.

8. The shell sand jacket of claim 4 wherein: The positioning component is perpendicular to the mold parting surface, and the draft angle is no greater than -1°.

9. A mold characterized by: Including a left mold and a right mold, the casting shell sand sleeve as described in any one of claims 1-8 is positioned on the left mold or the right mold by a positioning component.

10. The mold according to claim 9, characterized in that: The left or right mold is provided with a cavity that matches the shape of the sand sleeve of the casting shell. There is a fitting gap between the main body and the positioning part and the mold. The left or right mold has a limiting step on the back of the flange of the casting.

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