Molding method for casting mould of high-voltage switch shell and casting mould

Abstract

The invention belongs to the technical field of casting, and relates to a casting mold modeling method of a high-voltage switch shell and a casting mold. The casting mold modeling method comprises the following steps of outer mold modeling, specifically, a flange plate sand core and a movable block sand core are manufactured, and the flange plate sand core and the movable block sand core are installed at the corresponding positions of an outer mold; the core box of the inner cavity sand core forms a plurality of communicated core box inner cavities corresponding to the plurality of inner cavities of the high-voltage switch shell, and cooling pieces are placed at the joints of the adjacent core box inner cavities; the core box of the inner cavity sand core is used for manufacturing the inner cavity sand core, and the cooling piece is embedded into the inner cavity sand core; and the inner cavity sand core is placed in the inner cavity of the outer mold, and casting mold modeling is completed. By optimizing the casting mould, the internal structure defects of the casting are reduced, the quality of the casting is improved, and the pressure resistance and the air tightness of the high-voltage switch shell are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, and in particular relates to a casting mold forming method and a casting mold for a high-voltage switch housing. Background Art

[0002] In pressure vessels, three-way high-voltage switch housings are usually cast with aluminum alloy to ensure structural strength and reliability. These housings are filled with SF6 gas for insulation and protection. In order to ensure the safety and pressure resistance of the equipment, the castings must have excellent pressure resistance and airtightness. However, aluminum alloy casting faces many manufacturing challenges due to its complex structure and strict requirements for airtightness.

[0003] Due to the complexity of the high-voltage switch housing, if traditional sand casting is used, the production efficiency is low, the qualified rate is also low, and various casting defects exist on the surface, such as pores and looseness, which cannot meet the airtightness requirements. At present, most manufacturers turn to low-pressure metal mold casting, which can obtain more precise castings at higher production efficiency and can better control defects in the casting process, such as pores and looseness.

[0004] Although low-pressure metal mold casting has improved production efficiency, it still has some shortcomings. Due to the complex structure of the casting, the shrinkage of the body and the extremely complex thermal expansion and contraction of the live block, the casting is prone to pulling and stress concentration between cavities and between cavities and flanges during demolding. These factors can easily lead to cracks and internal structural defects in the casting, thus affecting the quality and reliability of the final product and increasing the scrap rate. Summary of the invention

[0005] In view of the deficiencies existing in the related art, the present invention provides a casting molding method and a casting mold for a high-voltage switch housing. By optimizing the casting mold, the internal structural defects of the casting are reduced, the quality of the casting is improved, and the pressure resistance and air tightness of the high-voltage switch housing are ensured.

[0006] A first aspect of the present invention provides a casting mold molding method for a high-voltage switch housing, wherein the high-voltage switch housing comprises a plurality of cavities connected in sequence, the interiors of the plurality of cavities are connected, a first flange is formed at the top of each cavity, and a second flange is formed on the same side of each cavity, the casting mold of the high-voltage switch housing comprises an outer mold and an inner cavity sand core arranged in the inner cavity of the outer mold, the inner surface of the outer mold is adapted to the outer shape of the high-voltage switch housing, and the outer surface of the inner cavity sand core is adapted to the inner cavity shape of the high-voltage switch housing, and a casting cavity is formed between the outer mold and the inner cavity sand core; the molding method comprises the following steps:

[0007] External mold shape:

[0008] A flange core box is manufactured corresponding to the first flange of the high-voltage switch housing;

[0009] Use the flange core box as a mold to make the flange sand core;

[0010] Install the flange sand core at the position of the inner cavity of the outer mold corresponding to the first flange;

[0011] The outer mold corresponds to the multiple cavities of the high-voltage switch housing to form a plurality of connected outer mold inner chambers, a connecting channel is formed between each two adjacent outer mold inner chambers, and a channel wall of the connecting channel is formed.

[0012] A notch is formed for installing the loose block;

[0013] Make loose block core boxes;

[0014] Using the loose-block core box as a mold to manufacture the loose-block sand core;

[0015] The movable sand core is embedded in the notch installed at the communicating channel;

[0016] Inner sand core modeling:

[0017] The core box of the inner cavity sand core corresponds to the multiple inner cavities of the high-voltage switch housing to form multiple connected cores.

[0018] Inner chambers of the core box, cooling elements are placed at the connection between the inner chambers of adjacent core boxes;

[0019] The inner cavity sand core is made by using the core box of the inner cavity sand core, and the cooling element is embedded in the inner cavity sand core;

[0020] Place the inner sand core into the inner cavity of the outer mold to complete the casting mold.

[0021] In the above technical scheme, based on the causes of defects in the high-voltage switch housing, the mold shape of the relevant positions causing demolding defects is optimized, and a combination of sand mold and metal mold is used to enhance the yield of the metal mold; the core box shape is optimized, and cooling parts are embedded in the inner sand core to improve the cooling system of the mold; through the combination of the above two aspects of optimization, the internal structural defects of the casting are reduced, the quality of the casting is significantly improved, and the problems existing in the existing high-voltage switch housing metal mold casting process are solved, the pressure resistance and airtightness of the high-voltage switch housing are guaranteed, and the qualified rate of the final product is improved.

[0022] In some embodiments of the first aspect, the outer mold includes a metal upper mold and a lower mold, the lower mold corresponds to the side of the high-voltage switch housing where the second flange is formed to form the second flange on the side of the high-voltage switch housing, the flange sand core includes a first flange sand core part respectively mounted on the upper mold and a second flange sand core part mounted on the lower mold, after the upper mold and the lower mold are molded together, multiple first flange sand core parts and multiple second flange sand core parts are connected one by one to form multiple complete flange sand cores. In this technical solution, each flange sand core consists of two parts, which is convenient for later demoulding and avoids demoulding defects.

[0023] In some embodiments of the first aspect, two notches are formed on the channel wall of each connecting channel, including a first notch located on the same side as the flange sand core and a second notch located on the opposite side of the first notch, and movable sand cores are respectively embedded and installed in the first notch and the second notch. In this solution, the notch positions are respectively aimed at the parts that are prone to defects during the casting molding process and the demolding process, and the movable sand core of the sand mold is embedded in the notch parts to improve the stress concentration inside the casting, reduce defects, and facilitate demolding.

[0024] In some embodiments of the first aspect, the core box of the inner cavity sand core includes an upper core box and a lower core box, the upper core box corresponds to a side of the inner cavity sand core close to the upper mold, and the lower core box corresponds to a side of the inner cavity sand core close to the lower mold. The inner cavity sand core is made by filling sand and compacting the mold cavity formed by docking the upper core box and the lower core box.

[0025] In some embodiments of the first aspect, the high-voltage switch housing further includes a third flange formed at the cavity connection, the third flange is located on the opposite side of the second flange, a hole is formed at the connection of the inner chamber of the core box at the position of the upper core box corresponding to the third flange, and a first cooling member is placed on the inner cavity wall above the hole and below the hole at the connection of the inner chamber of the core box. In this solution, the first cooling member is placed at the cavity connection where defects are prone to occur and the location is close to the active block sand core, and the cooling effect of the mold at this location is improved by embedding the cooling member.

[0026] In some embodiments of the first aspect, the lower core box is formed as a channel wall at the connection between the chambers in the core box, and the second cooling member is placed on the channel wall. Placing the first cooling member on the channel wall at the entire connection can significantly improve the cooling effect of the cavity connection part, improve the internal structural defects of the casting, and improve the quality of the casting.

[0027] A second aspect of the present invention provides a casting mold for a high-voltage switch housing, wherein the high-voltage switch housing includes a plurality of cavities connected in sequence, the interiors of the plurality of cavities are connected, a first flange is formed at the top of each cavity, a second flange is formed on the same side of each cavity, a third flange is provided at the cavity connection, and the third flange is located on the opposite side of the second flange, comprising:

[0028] An outer mold, the inner surface of the outer mold is adapted to the outer shape of the high-voltage switch housing, a plurality of flange sand cores are installed at the position of the outer mold corresponding to the first flange, the outer mold forms a plurality of connected outer mold inner chambers corresponding to the plurality of cavities of the high-voltage switch housing, a connecting channel is formed between every two adjacent outer mold inner chambers, a notch is formed on the channel wall of the connecting channel, and a movable block sand core is embedded and installed in the notch;

[0029] An inner cavity sand core, the inner cavity sand core comprises a plurality of sand core units adapted to the shapes of the plurality of inner cavities of the high voltage switch housing, and a cooling element is embedded in the position where the plurality of sand core units are connected;

[0030] A cavity for pouring is formed between the outer mold and the inner sand core.

[0031] The casting mold provided by the above technical solution combines the sand mold and the metal mold, enhances the yieldability of the casting mold, embeds a cooling part in the inner sand core, improves the cooling system of the casting mold, and uses the casting mold to form the high-voltage switch housing, thereby reducing the internal structural defects of the casting, ensuring the pressure resistance and air tightness of the high-voltage switch housing, and improving the qualification rate of the final product.

[0032] In some embodiments of the second aspect, the outer mold includes an upper mold and a lower mold of a metal mold, a shape for forming a second flange is formed on the lower mold, and a plurality of flange sand core first parts and a plurality of flange sand core second parts are respectively installed on the upper mold and the lower mold, and when the upper mold and the lower mold are molded, the plurality of flange sand core first parts and the plurality of flange sand core second parts are connected one by one to form a plurality of complete flange sand cores. In this technical solution, each flange sand core is composed of two parts, which is convenient for later demolding and avoids demolding defects.

[0033] In some embodiments of the second aspect, two notches are formed in the channel wall of each connecting channel, namely, a first notch on the same side as the flange sand core and a second notch on the opposite side of the first notch, and a movable sand core is embedded and installed in the first notch and the second notch, respectively. In this solution, the notch positions are respectively aimed at the parts that are prone to defects during the casting molding process and the demolding process, and the movable sand core of the sand mold is embedded in the notch parts to improve the stress concentration inside the casting, reduce defects, and facilitate demolding.

[0034] In some embodiments of the second aspect, the inner cavity sand core includes a first side opposite to the upper mold and a second side opposite to the lower mold, the first side of the inner cavity sand core is formed with a protrusion at the connection of the sand core unit, the protrusion corresponds to the inner cavity of the third flange, the inner cavity sand core is respectively embedded with a first cooling member above and below the protrusion, and the second side of the inner cavity sand core is formed with a connecting surface between the connection of the sand core units, and a second cooling member is embedded in the connecting surface. By embedding a cooling member in the inner cavity sand core and improving the cooling system of the casting mold, the cooling effect of the cavity connection part can be significantly improved, the internal structural defects of the casting can be improved, and the quality of the casting can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 It is a structural schematic diagram of a three-way high-voltage switch housing;

[0037] Figure 2 It is a cross-sectional view of the A side of the three-way high-voltage switch housing;

[0038] Figure 3 It is a cross-sectional view of the B side of the three-way high-voltage switch housing;

[0039] Figure 4a A schematic diagram of the structure of the outer mold in the casting mold provided by an embodiment of the present invention;

[0040] Figure 4b A front view of the outer mold in the casting mold provided by an embodiment of the present invention;

[0041] Figure 4c for Figure 4b Sectional view along AA;

[0042] Figure 5a A schematic diagram of the structure of the lower mold of the outer mold in the casting mold provided by an embodiment of the present invention;

[0043] Figure 5b A front view of the lower mold of the outer mold of the casting mold provided by an embodiment of the present invention;

[0044] Figure 5c A partial enlarged view of the first notch portion of the lower mold of the outer mold in the casting mold provided by an embodiment of the present invention;

[0045] Figure 5d A partial enlarged view of the second notch portion of the lower mold of the outer mold in the casting mold provided by an embodiment of the present invention;

[0046] Figure 6a A schematic diagram of the structure of the upper mold of the outer mold in the casting mold provided by an embodiment of the present invention;

[0047] Figure 6b A front view of the upper mold of the outer mold of the casting mold provided by an embodiment of the present invention;

[0048] Figure 7 A schematic structural diagram of a core box of an inner cavity sand core provided by an embodiment of the present invention;

[0049] Figure 8a A schematic structural diagram of an upper core box in a core box of an inner cavity sand core provided by an embodiment of the present invention;

[0050] Figure 8b A front view of an upper core box in a core box of an inner cavity sand core provided by an embodiment of the present invention;

[0051] Figure 9a A schematic structural diagram of a lower core box in a core box of an inner cavity sand core provided by an embodiment of the present invention;

[0052] Figure 9b A front view of a lower core box in a core box of an inner cavity sand core provided by an embodiment of the present invention;

[0053] Fig.10a The three-dimensional inner cavity sand core provided by the embodiment of the present invention Figure 1 ;

[0054] Fig.10b The three-dimensional inner cavity sand core provided by the embodiment of the present invention Figure 2 ;

[0055] Fig.10c A schematic diagram of a first side of an inner cavity sand core provided by an embodiment of the present invention;

[0056] Fig.10d A schematic diagram of the second side of the inner cavity sand core provided in an embodiment of the present invention.

[0057] In the figure:

[0058] 100, three-way high-voltage switch housing; 110, cavity; 121, first flange; 122, second flange; 123, third flange; 200, outer mold; 201, upper mold; 202, lower mold; 210, inner cavity of outer mold; 220, connecting channel; 230, notch; 231, first notch; 232, second notch; 300, flange sand core; 310, first part of flange sand core Part; 320, the second part of the flange sand core; 400, the movable block sand core; 500, the core box of the inner cavity sand core; 501, the inner chamber of the core box; 510, the upper core box; 511, the hole; 520, the lower core box; 521, the channel wall; 600, the cooling element; 601, the first cooling element; 602, the second cooling element; 700, the inner cavity sand core; 710, the sand core unit; 701, the protrusion; 702, the connecting surface. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0061] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Figure 1This is a schematic diagram of the structure of a three-way high-voltage switch housing 100, which includes three cavities 110 connected in sequence, each cavity 110 is vertically penetrated, and the interiors of adjacent cavities 110 are connected. A first flange 121 is formed on the top of each cavity 110, and second flanges 122 are formed on the same side of the three cavities 110. A third flange 123 is also formed at the connection of each cavity 110, and the second flange 122 is located on the opposite side of the second flange 122. For the three-way high-voltage switch, there are three first flanges 121 and two second flanges 122, and only the structural parts of the three-way high-voltage switch related to the present application are described here. For the undescribed parts of the three-way high-voltage switch housing structure, reference can be made to the prior art.

[0065] The three-way high-voltage switch housing 100 is cast from aluminum alloy, and is filled with SF6 gas to insulate during use, requiring the casting to have certain pressure resistance and airtightness. The three-way high-voltage switch housing 100 is composed of three cavities 110, and has a relatively complex structure. In the prior art, a low-pressure metal mold casting process is used to cast it. Due to the complexity of the casting structure and the thermal expansion and contraction process, when the casting is demolded, the cavities 110 interact and pull with each other, and between the cavities 110 and the flange, resulting in cracks and internal structural defects in the casting, causing the product to be scrapped.

[0066] In order to solve the above problems existing in the prior art in the molding process of the three-way high-voltage switch housing 100, the casting molding process is analyzed in detail. Figure 2 As shown in the figure, the bottom surface is placed downwards, and the position that affects demoulding on the mold is analyzed, mainly the B surface (as shown in the figure Figure 3 After the casting shrinks, due to the limitation of the flange on the A side (i.e., the second flange 122), the back of the flange on the B side will be close to the mold, which makes demolding difficult. After demolding, the four loose blocks between the three cavities 110 are tightly fitted with the cavity 110 due to the shrinkage of the casting. When they are taken out, they are pulled against the casting, and micro cracks are easily generated in the casting, affecting the internal structure of the casting, thereby affecting the pressure resistance and air tightness of the final product.

[0067] Based on the above analysis, in order to solve the problem that demolding of the high-voltage switch housing affects the quality of the casting during low-pressure metal mold casting, the present application proposes a casting mold modeling method for the high-voltage switch housing, which combines the sand mold with the metal mold, optimizes the modeling method of the outer mold and the inner cavity sand core, and solves the defects of the casting. The casting mold of the high-voltage switch housing includes an outer mold 200 and an inner cavity sand core 700 disposed in the inner cavity of the outer mold 200. The inner surface of the outer mold 200 is adapted to the outer shape of the high-voltage switch housing and the outer surface of the inner cavity sand core 700 is adapted to the inner cavity shape of the high-voltage switch housing, and a casting cavity is formed between the outer mold 200 and the inner cavity sand core 700.

[0068] In an illustrative embodiment of a casting mold forming method for a high-voltage switch housing of the present application, the casting mold forming method comprises the following steps:

[0069] (1) Optimizing the shape of the outer mold 200:

[0070] Manufacturing the flange sand core 300: manufacturing a flange core box corresponding to the first flange 121 of the high-voltage switch housing; using the flange core box as a mold to manufacture the flange sand core 300; installing the flange sand core 300 at the position of the inner cavity of the outer mold 200 corresponding to the first flange 121 of the high-voltage switch housing;

[0071] Manufacturing the movable block sand core 400: the outer mold 200 forms a plurality of interconnected outer mold inner chambers 210 corresponding to the plurality of cavities 110 of the high-voltage switch housing, a connecting channel 220 is formed between every two adjacent outer mold inner chambers 210, and a notch 230 for installing the movable block is formed on the channel wall 521 of the connecting channel 220; manufacturing the movable block core box; using the movable block core box as a mold to manufacture the movable block sand core 400; embedding the movable block sand core 400 into the notch 230 installed at the connecting channel 220;

[0072] (2) Optimize the shape of the inner sand core:

[0073] The core box 500 of the inner cavity sand core forms a plurality of interconnected core box inner chambers 501 corresponding to the plurality of inner chambers of the high voltage switch housing, and a cooling member 600 is placed at the connection between adjacent core box inner chambers 501; the core box 500 of the inner cavity sand core is used to make an inner cavity sand core 700 and the cooling member 600 is embedded in the inner cavity sand core 700;

[0074] (3) The inner cavity sand core 700 is placed in the inner cavity of the outer mold 200 to complete the casting mold.

[0075] The casting mold modeling method provided in the above-mentioned embodiments of the present application optimizes the casting mold accordingly according to the complex structure unique to the high-voltage switch housing. Before the optimization, the causes of demolding defects caused by specific positions in the existing casting process are first analyzed in combination with the unique structure of the high-voltage switch housing. Based on this cause, the casting mold modeling of the relevant positions causing the demolding defects is optimized, and the casting mold of the first flange and the movable block position is changed to a sand mold, thereby enhancing the yieldability of the metal mold. In addition, since some positions are changed from metal molds to sand molds, the cooling system of the casting will change, the cooling rate at the junction between cavities will be reduced, and isolated liquid phases will be easily generated, resulting in defects such as looseness and shrinkage cavities, which will affect the pressure resistance and air tightness of the casting. In order to avoid the above problems, the cooling environment at the junction between cavities is improved, and the inner cavity sand core is optimized at the same time. By placing a cooling part at the corresponding position of the core box, the cooling part is directly embedded in the inner cavity sand core during the inner cavity sand core molding process, and the cooling system of the entire casting mold is optimized by embedding the cooling part in combination with the sand mold part; through the combination of the above two aspects of optimization, the internal tissue defects of the casting are reduced, the quality of the casting is significantly improved, the problems existing in the existing high-voltage switch housing metal mold casting process are solved, the pressure resistance and air tightness of the high-voltage switch housing are guaranteed, and the qualified rate of the final product is improved.

[0076] In some embodiments, the flange sand core 300 and the movable block sand core 400 are made of resin sand, which is cured by cross-linking reaction through the action of a curing agent to provide the necessary strength of the sand core. After the flange sand core 300 and the movable block sand core 400 are made, a special coating is applied to the surface of the sand core, and then the flange sand core 300 and the movable block sand core 400 are fixed to the corresponding position of the outer mold 200 with a fixing glue to prevent the sand core from falling.

[0077] The structural schematic diagram of an embodiment of the outer mold is as follows Figure 4a and Figure 4b As shown, the cross-sectional view is Figure 4c In this embodiment, the outer mold 200 includes a metal upper mold 201 and a lower mold 202. The lower mold 202 corresponds to the side of the high-voltage switch housing where the second flange 122 is formed, and is used to form the second flange 122 on the side of the high-voltage switch housing. Figure 5a and Figure 5b It is the structural diagram of the lower mold. Figure 5c and Figure 5d It is a partial enlarged view of the part where the movable block sand core is installed on the lower mold, wherein the movable block sand core 400 leaves the notch part; Figure 6a and Figure 6b It is understood that after the upper mold 201 and the lower mold 202 are molded together, a plurality of interconnected outer mold inner chambers 210 are formed between the two molds, and a connecting channel 220 is formed between every two adjacent outer mold inner chambers 210 .

[0078] like Figure 5a-Figure 6b As shown, the flange sand core 300 includes a flange sand core first part 310 respectively mounted on the upper mold 201 and a flange sand core second part 320 mounted on the lower mold 202. After the upper mold 201 and the lower mold 202 are molded together, multiple flange sand core first parts 310 and multiple flange sand core second parts 320 are connected one by one to form multiple complete flange sand cores 300. In this embodiment, each flange sand core 300 is composed of two parts, which is convenient for later demoulding and avoids demoulding defects; the flange sand core first part 310 and the flange sand core second part 320 can be evenly divided from the flange sand core 300.

[0079] In some embodiments, see further Figure 5c and Figure 5d Two notches 230 are formed on the channel wall 521 of each connecting channel 220, including a first notch 231 located on the same side as the flange sand core 300 and a second notch 232 located on the opposite side of the first notch 231. The positions of the first notch 231 and the second notch 232 are respectively aimed at the parts that are prone to defects during the casting molding process and the demolding process. The movable block sand core 400 of the sand mold is embedded in the notch 230 to improve the stress concentration inside the casting, reduce defects, and facilitate demolding. Specifically, the notch 230 can be formed only in the lower mold 202, thereby simplifying the molding process.

[0080] In some embodiments, the core box 500 of the inner cavity sand core includes an upper core box 510 and a lower core box 520, wherein the upper core box 510 corresponds to the side of the inner cavity sand core 700 close to the upper mold 201, and the lower core box 520 corresponds to the side of the inner cavity sand core 700 close to the lower mold 202. The inner cavity sand core 700 is made by compacting the mold cavity formed by the upper core box 510 and the lower core box 520 after docking, and the upper core box 510 is used to form the side of the inner cavity sand core 700 opposite to the upper mold 201, that is, the side corresponding to the third flange 123 of the high-voltage switch housing; the lower core box 520 is used to form the other side of the inner cavity sand core 700 opposite to the lower mold 202, that is, the side corresponding to the second flange 122 of the high-voltage switch housing.

[0081] In some embodiments, Figure 7-9bAs shown, the upper core box 510 forms a hole 511 at the connection of the core box inner chamber 501 at the position corresponding to the third flange 123 of the high-voltage switch housing, and the first cooling member 601 is placed on the inner cavity wall above and below the hole 511 at the connection of the core box inner chamber 501. The shape of the hole 511 is used to form the protrusion 701 of the inner cavity sand core 700, and the protrusion 701 of the inner cavity sand core 700 corresponds to the inner cavity of the third flange 123. Through the shape optimization, the inner cavity sand core 700 formed is embedded with the first cooling member 601 on the upper and lower surfaces of the transition to the protrusion 701. This position belongs to the connection of the cavity 110 where defects are prone to occur and this position is close to the active block sand core 400. By embedding the cooling member 600, the cooling effect of the mold at this position is improved. The cooling member 600 described in this application can be a component with a faster cooling effect such as cold iron.

[0082] In some embodiments, Figure 9a and Figure 9b As shown, the lower core box 520 is formed as a channel wall 521 at the connection between the core box inner chambers 501, and the second cooling member 602 is placed on the channel wall 521. A channel connecting the inner chambers 501 of the core box is formed between them. Based on the specific shape of the high-voltage switch housing, the position where the first cooling member 602 is placed corresponds to the position where the three second flanges 122 are connected in pairs. The connection between the core box inner chambers 501 is a channel wall 521 that is approximately flat. The first cooling member 602 is placed on the channel wall 521 at the entire connection, which can significantly improve the cooling effect of the connection part of the cavity 110, improve the internal structural defects of the casting, and improve the quality of the casting.

[0083] On the other hand, the present application also provides a casting mold for a high-voltage switch housing, which is manufactured by the above casting molding method. As described above, the high-voltage switch housing includes a plurality of cavities 110 connected in sequence, the interiors of the plurality of cavities 110 are connected, a first flange 121 is formed on the top of each cavity 110, a second flange 122 is formed on the same side of each cavity 110, and a third flange 123 is provided at the connection of the cavities 110, and the third flange 123 is located on the opposite side of the second flange 122.

[0084] In an illustrative embodiment of a casting mold for a high-voltage switch housing, the casting mold includes an outer mold 200 and an inner cavity sand core 700; the inner surface of the outer mold 200 is adapted to the outer shape of the high-voltage switch housing, and a plurality of flange sand cores 300 are installed at the position of the outer mold 200 corresponding to the first flange 121; the outer mold 200 forms a plurality of interconnected outer mold inner chambers 210 corresponding to the plurality of cavities 110 of the high-voltage switch housing, and a connecting channel 220 is formed between every two adjacent outer mold inner chambers 210; a notch 230 is formed on the channel wall 521 of the connecting channel 220, and a movable block sand core 400 is embedded and installed in the notch 230; the inner cavity sand core 700 includes a plurality of sand core units 710 adapted to the plurality of inner cavity shapes of the high-voltage switch housing, and a cooling member 600 is embedded at the position where the plurality of sand core units 710 are connected; a cavity for casting is formed between the outer mold 200 and the inner cavity sand core 700.

[0085] In some embodiments, the outer mold 200 includes an upper mold 201 and a lower mold 202 of a metal mold, a shape for forming the second flange 122 is formed on the lower mold 202, and multiple flange sand core first parts 310 and multiple flange sand core second parts 320 are respectively installed on the upper mold 201 and the lower mold 202. When the upper mold 201 and the lower mold 202 are molded, the multiple flange sand core first parts 310 and the multiple flange sand core second parts 320 are connected one by one to form multiple complete flange sand cores 300. In this embodiment, each flange sand core 300 is composed of two parts, which is convenient for later demoulding and avoids demoulding defects; the flange sand core first part 310 and the flange sand core second part 320 can be evenly divided from the flange sand core 300.

[0086] In some embodiments, the channel wall 521 of each connecting channel 220 is formed with two notches 230, which are respectively a first notch 231 located on the same side as the flange sand core 300 and a second notch 232 located on the opposite side of the first notch 231, and a movable sand core 400 is respectively embedded and installed in the first notch 231 and the second notch 232. The positions of the first notch 231 and the second notch 232 are respectively aimed at the parts that are prone to defects during the casting molding process and the demolding process. The movable sand core 400 of the sand mold is embedded in the notch 230 to improve the stress concentration inside the casting, reduce defects, and facilitate demolding. Specifically, the notch 230 can be formed only in the lower mold 202, thereby simplifying the molding process.

[0087] In some embodiments, Figure 10a-Figure 10bAs shown, the inner cavity sand core 700 includes a first side opposite to the upper mold 201 and a second side opposite to the lower mold 202; the first side of the inner cavity sand core 700 is formed with a protrusion 701 at the connection of the sand core unit 710, the protrusion 701 corresponds to the inner cavity of the third flange 123, and the inner cavity sand core 700 is respectively embedded with a first cooling member 601 above and below the protrusion 701; the second side of the inner cavity sand core 700 is formed with a connection surface 702 between the connection of the sand core unit 710, and a second cooling member 602 is embedded in the connection surface 702. A plurality of second cooling members 602 may be provided, and the plurality of second cooling members 602 cover the entire connection surface 702.

[0088] In the above embodiment, by optimizing the shape of the inner cavity sand core 700, the inner cavity sand core 700 is formed with a cooling part 600 embedded in the connection with the cavity 110 where defects are prone to occur, which can improve the cooling effect of the mold at this position, reduce the impact of installing the movable block sand core 400 on the cooling system of the mold, improve the internal structural defects of the casting, and improve the quality of the casting.

[0089] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0090] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for molding a high-voltage switch housing, wherein: The high-voltage switch housing comprises a plurality of cavities connected in sequence, the interiors of the plurality of cavities are connected, a first flange is formed at the top of each of the cavities, and a second flange is formed on the same side of each of the cavities. The casting mold of the high-voltage switch housing comprises an outer mold and an inner cavity sand core arranged in the inner cavity of the outer mold, the inner surface of the outer mold is adapted to the outer shape of the high-voltage switch housing, and the outer surface of the inner cavity sand core is adapted to the inner cavity shape of the high-voltage switch housing, and a casting cavity is formed between the outer mold and the inner cavity sand core, characterized in that the molding method comprises the following steps: External mold shape: Manufacturing a flange core box corresponding to the first flange of the high-voltage switch housing; Using the flange core box as a mold to make a flange sand core; Installing the flange sand core at a position in the outer mold cavity corresponding to the first flange; The outer mold forms a plurality of interconnected outer mold inner chambers corresponding to the plurality of cavities of the high-voltage switch housing, a connecting channel is formed between every two adjacent outer mold inner chambers, and a notch for installing a movable block is formed on the channel wall of the connecting channel; Make loose block core boxes; Using the movable block core box as a mold to manufacture a movable block sand core; Embedding the movable sand core into the notch installed at the communicating channel; Inner sand core modeling: The core box of the inner cavity sand core corresponds to the multiple inner cavities of the high-voltage switch housing to form multiple interconnected core box inner chambers, and a cooling element is placed at the connection between adjacent core box inner chambers; Using the core box of the inner cavity sand core to manufacture the inner cavity sand core, and embedding the cooling element into the inner cavity sand core; The inner cavity sand core is placed in the inner cavity of the outer mold to complete the casting mold.

2. The method for molding a high-voltage switch housing according to claim 1, characterized in that: The outer mold includes an upper mold and a lower mold of a metal mold. The lower mold corresponds to the side of the high-voltage switch housing where a second flange is formed, and is used to form the second flange on the side of the high-voltage switch housing. The flange sand core includes a first flange sand core part respectively installed on the upper mold and a second flange sand core part installed on the lower mold. After the upper mold and the lower mold are molded together, multiple first flange sand core parts and multiple second flange sand core parts are connected one by one to form multiple complete flange sand cores.

3. The method for molding a high-voltage switch housing according to claim 2, characterized in that: Two notches are formed on the channel wall of each connecting channel, including a first notch located on the same side as the flange sand core and a second notch located on the opposite side of the first notch, and the movable block sand core is respectively embedded and installed in the first notch and the second notch.

4. The method for molding a high-voltage switch housing according to claim 3, characterized in that: The core box of the inner cavity sand core comprises an upper core box and a lower core box, wherein the upper core box corresponds to a side of the inner cavity sand core close to the upper mold, and the lower core box corresponds to a side of the inner cavity sand core close to the lower mold.

5. The method for molding a high-voltage switch housing according to claim 4, characterized in that: The high-voltage switch housing also includes a third flange formed at the cavity connection, the third flange is located on the opposite side of the second flange, the position of the upper core box corresponding to the third flange forms a hole at the connection of the core box inner chamber, and the first cooling member is respectively placed on the inner cavity wall above and below the hole at the connection of the core box inner chamber.

6. The method for molding a high-voltage switch housing according to claim 4, characterized in that: The lower core box is formed as a channel wall at the connection between the inner chambers of the core box, and a second cooling member is placed on the channel wall.

7. A casting mold for a high voltage switch housing, wherein: The high-voltage switch housing comprises a plurality of cavities connected in sequence, the interiors of the plurality of cavities are connected, a first flange is formed on the top of each cavity, a second flange is formed on the same side of each cavity, a third flange is provided at the cavity connection, the third flange is located on the opposite side of the second flange, and is characterized in that it comprises: An outer mold, the inner surface of which is adapted to the outer shape of the high-voltage switch housing, a plurality of flange sand cores are installed at the position of the outer mold corresponding to the first flange, the outer mold forms a plurality of connected outer mold inner chambers corresponding to the plurality of cavities of the high-voltage switch housing, a connecting channel is formed between every two adjacent outer mold inner chambers, a notch is formed on the channel wall of the connecting channel, and a movable block sand core is embedded and installed in the notch; An inner cavity sand core, the inner cavity sand core comprises a plurality of sand core units adapted to the shapes of the plurality of inner cavities of the high-voltage switch housing, and a cooling element is embedded in the position where the plurality of sand core units are connected; A cavity for casting is formed between the outer mold and the inner sand core.

8. The casting mold of the high-voltage switch housing according to claim 7, characterized in that: The outer mold includes an upper mold and a lower mold of a metal mold, and a shape for forming the second flange is formed on the lower mold. The upper mold and the lower mold are respectively installed with multiple flange sand core first parts and multiple flange sand core second parts. When the upper mold and the lower mold are closed, the multiple flange sand core first parts and the multiple flange sand core second parts are connected one by one to form multiple complete flange sand cores.

9. The casting mold of the high-voltage switch housing according to claim 8, characterized in that: The channel wall of each of the connecting channels is formed with two notches, which are a first notch on the same side as the flange sand core and a second notch on the opposite side of the first notch, and the movable block sand core is embedded and installed in the first notch and the second notch respectively.

10. The casting mold of the high voltage switch housing according to claim 9, characterized in that: The inner cavity sand core includes a first side opposite to the upper mold and a second side opposite to the lower mold, the first side of the inner cavity sand core is formed with a protrusion at the connection of the sand core units, the protrusion corresponds to the inner cavity of the third flange, the inner cavity sand core is respectively embedded with a first cooling member above and below the protrusion, the second side of the inner cavity sand core is formed with a connecting surface between the connections of the sand core units, and a second cooling member is embedded in the connecting surface.

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