Skin lattice structure manufacturing mold

Abstract

The utility model discloses a skin lattice structure manufacturing mold which comprises an upper mold, a middle mold and a lower mold which are sequentially arranged from top to bottom, and the upper mold and the lower mold are respectively provided with a plurality of upper sprues and lower sprues; the middle mold comprises a middle frame, a wax mold, a pouring piece, a positioning frame and a plurality of gaskets, and the outer end faces of the gaskets and the outer end face of the wax mold are flush with the end face of the middle frame; the bottom of the upper die and the top of the lower die are respectively provided with a first concentric-square-shaped groove and a second concentric-square-shaped groove which correspond to the positioning frames, the positioning frame at the top of the middle frame is embedded into the first concentric-square-shaped groove, and the positioning frame at the bottom of the middle frame is embedded into the second concentric-square-shaped groove. Due to the arrangement of the positioning frame, the first concentric-square-shaped groove and the second concentric-square-shaped groove, rapid positioning of the upper die, the lower die and the middle frame is facilitated, the structural stability of the upper die, the middle die and the lower die during casting is ensured, and the casting precision of the skin lattice structure is improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold for manufacturing a skin dot matrix structure. Background Technology

[0002] With the innovative development of aerospace technology and its deep integration with civilian applications, skin lattice structures have been widely used in satellite communication, satellite navigation, and satellite remote sensing. A skin lattice structure is a novel structural material composed of two thin-walled skins and a regularly arranged lattice structure in the middle. This structure possesses advantages such as lightweight, high specific strength, high specific stiffness, and multifunctional potential. The casting mold for a skin lattice structure typically includes three parts: an upper mold, a middle mold, and a lower mold. The middle mold contains a wax model corresponding to the shape of the skin lattice structure. Metal components (such as heat pipes, thermal control pipes, cable conduits, or hydraulic pipes) can be placed within the wax model to improve heat dissipation. The upper and lower molds are respectively equipped with upper and lower gating risers extending to the wax model for pouring molten metal. When producing casting molds for skin lattice structures, the process begins by using additive manufacturing methods (such as SLA, MJM, 3DP, or FDM) to create a wax model with the same shape as the skin lattice structure. Then, cavities corresponding to the shapes of the metal components are machined into the wax model, and the metal components are placed inside. Next, investment casting is used to coat the wax model with refractory material to form a ceramic shell. After firing, the wax model melts, forming a cavity. Finally, molten metal is poured into the ceramic shell. After the molten metal solidifies, the ceramic shell is removed, and the finished product is obtained. Precision casting ensures the dimensional accuracy and surface finish of the castings, reducing the workload of subsequent machining.

[0003] When the workpiece is cast and molded using a precision casting mold for a skin lattice structure, the upper and lower molds are prone to displacement, which can lead to inaccurate dimensions in the manufactured skin lattice structure and increase the time required for subsequent processing.

[0004] After the workpiece is cast, the existing casting mold still requires manual demolding. Furthermore, the cast workpiece may stick to the inner wall of the mold cavity due to high temperature, affecting the subsequent demolding process and making it inconvenient for the subsequent forming process of the cast workpiece. Utility Model Content

[0005] The purpose of this invention is to provide a manufacturing mold for a skin dot matrix structure, so as to solve the problem that the upper and lower molds in existing manufacturing molds are prone to movement, resulting in inaccurate dimensions of the cast skin dot matrix structure.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A mold for manufacturing a skin dot matrix structure includes: an upper mold, a middle mold, and a lower mold arranged from top to bottom, with the upper mold and the lower mold respectively having a plurality of upper gates and lower gates;

[0008] The middle mold includes a middle frame, a wax model disposed inside the middle frame, a casting part disposed inside the wax model and disposed inside the middle frame, positioning frames disposed on the top inner edge and bottom inner edge of the middle frame respectively, and several gaskets disposed on the top and bottom of the casting part and extending from the end face of the wax model respectively. The outer end face of the gaskets and the outer end face of the wax model are flush with the end face of the middle frame.

[0009] The bottom of the upper mold and the top of the lower mold are respectively provided with a first spiral groove and a second spiral groove corresponding to the positioning frame. The positioning frame at the top of the middle frame is embedded in the first spiral groove, and the positioning frame at the bottom of the middle frame is embedded in the second spiral groove.

[0010] Furthermore, the aforementioned upper mold includes an upper frame and an upper heat dissipation plate disposed on the inner side of the upper frame. The upper heat dissipation plate has several upper gates, and all the upper gates are arranged in a rectangular array.

[0011] Furthermore, the lower mold includes a lower frame and a lower heat sink plate disposed on the inner side of the lower frame. The lower heat sink plate has several gates, and all the gates are arranged in a rectangular array and correspond one-to-one with the upper gates. The upper gates and lower gates are arranged alternately with the gaskets.

[0012] Furthermore, the outer and inner sides of the upper frame are flush with the outer and inner sides of the middle frame, and the outer and inner sides of the lower frame are flush with the outer and inner sides of the middle frame.

[0013] Furthermore, the two sides of the aforementioned middle frame are respectively provided with a pushing mechanism for pushing the upper mold and the lower mold away from each other and for demolding.

[0014] Furthermore, the middle frame is provided with a first hole, a second hole, a third hole, a fourth hole and a fifth hole in sequence from top to bottom near the outer edge, and a horizontal hole perpendicular to and connected to the third hole is provided on the outer side of the middle frame;

[0015] The pushing mechanism includes a push rod that slides through the horizontal hole and extends into the third hole, an upper rod that slides in the first and second holes and corresponds to the push rod, a lower rod that slides in the fourth and fifth holes and corresponds to the push rod, a first spring that is installed in the second hole and sleeved on the outer wall of the upper rod, and a second spring that is installed in the fourth hole and sleeved on the outer wall of the lower rod. The diameter of the first hole is smaller than the diameter of the second hole and matches the diameter of the upper rod. The diameter of the fifth hole is smaller than the diameter of the fourth hole and matches the diameter of the lower rod. The bottom end of the first spring is connected to the outer wall of the upper rod, and the top end of the second spring is connected to the outer wall of the lower rod.

[0016] Furthermore, when the end of the aforementioned push rod contacts the inner wall of the third hole, the upper rod extends out from the first hole, and the lower rod extends out from the fifth hole.

[0017] Furthermore, the ends of the upper and lower rods that are close to each other have an arc-shaped structure, and the end of the push rod located in the third hole has an arc-shaped structure.

[0018] This utility model has the following beneficial effects:

[0019] 1. The manufacturing mold for the skin dot matrix structure of this utility model has positioning frames set at the inner edges of the top and bottom of the middle frame, which facilitates the embedding of the first spiral groove on the upper mold and the second spiral groove on the lower mold, so that the upper mold, middle mold and lower mold are limited and fixed; and the setting of the positioning frames and the first and second spiral grooves facilitates the rapid positioning of the upper mold and lower mold with the middle frame, ensuring the structural stability of the upper mold, middle mold and lower mold during casting, and improving the casting accuracy of the skin dot matrix structure; the shims are used to ensure that the casting part is supported by the upper mold and lower mold and is not easily deformed and collapsed, thereby ensuring the stability of the cavity structure formed by the melting of the wax model and improving the casting success rate of the skin dot matrix structure.

[0020] 2. The manufacturing mold for the skin dot matrix structure of this utility model, by setting a pushing mechanism, when demolding and mold removal are required, pressing the push rod can push the upper rod to move along the middle frame and contact the bottom of the upper mold, and push the lower rod to move along the middle frame and contact the bottom of the lower mold, so that the upper rod and the lower rod move in opposite directions and simultaneously push the upper mold and the lower mold away from each other, realizing the demolding operation, which is convenient. Attached Figure Description

[0021] Figure 1 An exploded structural diagram of the mold for manufacturing the skin lattice structure;

[0022] Figure 2 A cross-sectional view of the mold used to manufacture the skin lattice structure;

[0023] Figure 3 for Figure 2 A magnified structural diagram at point A;

[0024] Figure 4 A schematic diagram of the local state structure when the mechanism is demolded.

[0025] In the diagram: 1. Upper mold; 11. Upper gate; 12. Upper frame; 13. Upper heat sink; 2. Middle mold; 21. Middle frame; 211. First hole; 212. Second hole; 213. Third hole; 214. Fourth hole; 215. Fifth hole; 216. Horizontal hole; 22. Wax model; 23. Casting part; 24. Positioning frame; 25. Gasket; 3. Lower mold; 31. Lower gate; 32. Lower frame; 33. Lower heat sink; 4. First groove; 5. Second groove; 6. Pushing mechanism; 61. Push rod; 62. Upper rod; 63. Lower rod; 64. First spring; 65. Second spring. Detailed Implementation

[0026] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0027] like Figure 1 and Figure 2 As shown, an embodiment of this utility model provides a manufacturing mold for a skin dot matrix structure, including: an upper mold 1, a middle mold 2 and a lower mold 3 arranged sequentially from top to bottom, with the upper mold 1 and the lower mold 3 respectively having a plurality of upper gates 11 and lower gates 31.

[0028] Specifically, the middle mold 2 includes a middle frame 21, a wax mold 22 disposed inside the middle frame 21, and in this embodiment, the shape of the wax mold 22 corresponds to the shape of the skin dot matrix structure; a casting part 23 disposed inside the middle frame 21 and located inside the wax mold 22; positioning frames 24 respectively disposed on the top inner edge and bottom inner edge of the middle frame 21; and a plurality of gaskets 25 respectively disposed on the top and bottom of the casting part 23 and extending from the end face of the wax mold 22. The outer end face of the gaskets 25 and the outer end face of the wax mold 22 are flush with the end face of the middle frame 21. The gaskets 25 play a supporting role, which is used to ensure that the casting part 23 is supported by the upper mold 1 and the lower mold 3 and is not easily deformed, thereby ensuring the stability of the cavity structure formed by the melting of the wax mold 22.

[0029] The bottom of the upper mold 1 and the top of the lower mold 3 are respectively provided with a first spiral groove 4 and a second spiral groove 5 corresponding to the positioning frame 24. The positioning frame 24 at the top of the middle frame 21 is embedded in the first spiral groove 4, and the positioning frame 24 at the bottom of the middle frame 21 is embedded in the second spiral groove 5. The dimensions of the first spiral groove 4 and the second spiral groove 5 are matched with the dimensions of the positioning frame 24. The positioning frame 24 on the middle frame 21 has a spiral structure. The positioning frame 24 is used to embed in the first spiral groove 4 and the second spiral groove 5, and to prevent the upper mold 1 and the lower mold 3 from shifting during use, thus ensuring the dimensions when casting the skin lattice structure and ensuring casting accuracy.

[0030] The upper mold 1 includes an upper frame 12 and an upper heat sink 13 disposed on the inner side of the upper frame 12. The upper heat sink 13 has several upper gates 11 arranged in a rectangular array. The lower mold 3 includes a lower frame 32 and a lower heat sink 33 disposed on the inner side of the lower frame 32. The lower heat sink 33 has several lower gates 31 arranged in a rectangular array, corresponding one-to-one with the upper gates 11. The upper gates 11 and lower gates 31 are staggered with the gasket 25. The upper heat sink 13 and lower heat sink 33 are used to dissipate heat from the interior of the middle frame 21. Both the upper heat sink 13 and lower heat sink 33 are made of high-temperature resistant and thermally conductive copper, or other high-temperature resistant materials with certain thermal conductivity and structural stability. The gasket 25 is made of a high-temperature resistant and structurally stable material, such as ceramic; no specific limitations are imposed here.

[0031] Furthermore, in this embodiment, the outer and inner sides of the upper frame 12 are flush with the outer and inner sides of the middle frame 21, and the outer and inner sides of the lower frame 32 are flush with the outer and inner sides of the middle frame 21. In this embodiment, the upper frame 12, the middle frame 21, and the lower frame 32 are all made of high-temperature resistant metal material.

[0032] like Figure 3 and Figure 4 As shown, in order to facilitate demolding, the middle frame 21 is provided with pushing mechanisms 6 on both sides to push the upper mold 1 and the lower mold 3 away from each other and demold.

[0033] Specifically, the middle frame 21 has a first hole 211, a second hole 212, a third hole 213, a fourth hole 214 and a fifth hole 215 in sequence from top to bottom near the outer edge, and a horizontal hole 216 perpendicular to and connected to the third hole 213 is opened on the outer side of the middle frame 21.

[0034] The pushing mechanism 6 includes a push rod 61 that slides through a transverse hole 216 and extends into a third hole 213, the size of which is slightly larger than that of the push rod 61; an upper rod 62 that slides within a first hole 211 and a second hole 212 and corresponds to the push rod 61, the size of which matches the size of the first hole 211; and a lower rod 63 that slides within a fourth hole 214 and a fifth hole 215 and corresponds to the push rod 61, the size of which matches the size of the fifth hole 215; and installation. A first spring 64 is fitted inside the second hole 212 and onto the outer wall of the upper rod 62, and a second spring 65 is fitted inside the fourth hole 214 and onto the outer wall of the lower rod 63. The diameter of the first hole 211 is smaller than the diameter of the second hole 212 and matches the diameter of the upper rod 62. The diameter of the fifth hole 215 is smaller than the diameter of the fourth hole 214 and matches the diameter of the lower rod 63. The bottom end of the first spring 64 is connected to the outer wall of the upper rod 62, and the top end of the second spring 65 is connected to the outer wall of the lower rod 63. The diameter of the third hole 213 is smaller than the diameters of the second hole 212 and the fourth hole 214, thereby preventing the upper rod 62 and the lower rod 63 from slipping off. Furthermore, in this embodiment, the ends of the upper rod 62 and the lower rod 63 that are close to each other have an arc-shaped structure, and the end of the push rod 61 located in the third hole 213 has an arc-shaped structure. In this embodiment, in order to prevent the push rod 61 from slipping, a limit ring is fixed on the outer wall of the push rod 61, and a limit gasket is fixed on the inner wall of the transverse hole 216 on the side away from the third hole 213.

[0035] When push rod 61 is not inserted into the third hole 213 / when push rod 61 is inserted into the third hole 213 but does not contact the upper rod 62 and the lower rod 63, the upper rod 62 and the lower rod 63 move closer to each other, and the top of the upper rod 62 is flush with the end face of the middle frame 21, and the bottom of the lower rod 63 is flush with the end face of the middle frame 21.

[0036] When the end of push rod 61 contacts the inner wall of the third hole 213, the upper rod 62 extends out from the first hole 211 and the lower rod 63 extends out from the fifth hole 215. The upper rod 62 corresponds to the bottom of the upper frame 12 and the lower rod 63 corresponds to the top of the lower frame 32. With this arrangement, when the push rod 61 on the pushing mechanism 6 on both sides of the middle frame 21 is pressed, the push rod 61 moves along the direction of the third hole 213, and simultaneously pushes the upper rod 62 to contact the bottom of the upper frame 12 and the lower rod 63 to contact the top of the lower frame 32, thus ejecting the upper mold 1 and the lower mold 3 to achieve the demolding operation.

[0037] In use, a wax model 22 corresponding to the skin lattice structure is produced using additive manufacturing, and the dimensions of the wax model 22 correspond to the dimensions of the middle frame 21. Additive manufacturing technology can accurately control the shape and size of the wax model 22. When it is necessary to place metal components inside the skin lattice structure, cavities (not shown) corresponding to the metal components can be machined on the wax model 22. The metal components are placed in the cavities, and wax is used to fill and smooth them to seal the cavities. Openings are made on the side walls of the middle frame 21. For the pouring gate, place the wax model 22 inside the middle frame 21, stand the middle frame 21 upright with the pouring gate facing upwards, and seal the openings on both sides of the middle frame 21 with external sheeting. Pour the casting material into the middle frame 21. After the casting material solidifies, it wraps the wax model 22 with refractory material, forming the casting part 23 (i.e., ceramic shell). The casting material is gypsum or clay. Remove the sheeting on both sides of the middle frame 21, and further process through holes at the top and bottom of the wax model 22 for installing the gasket 25. At the same time, add... The mounting holes corresponding to the through holes are drilled, and the gasket 25 is inserted into the mounting holes of the casting part 23 through the through holes on the wax model 22, thus obtaining the middle mold 2. The middle mold 2 is then placed in a furnace for baking. After the wax model 22 melts to form a casting cavity, the upper mold 1 and the lower mold 3 are installed. High-temperature liquid metal is injected into the casting cavity through the upper gate 11 in the upper heat sink 13. The material of the liquid metal can be a light alloy or a high-temperature alloy. After the liquid metal solidifies, it will form a blank. At the same time, the upper heat sink 13... The solidification of the molten metal is accelerated by the action of the lower heat sink 33, and heat dissipation is achieved. Some of the molten metal will solidify into the lower gate 31. After solidification, the mold is erected and the push rods 61 on both sides of the middle frame 21 are pressed. The upper rod 62 and the lower rod 63 push out the upper mold 1 and the lower mold 3 to achieve rapid demolding. The blank is left in the middle frame 21. The middle frame 21 is removed and the casting part 23 on the outside of the blank is removed for further processing and treatment to obtain the final skin dot matrix structure product.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold for manufacturing a skin lattice structure, comprising: The upper mold (1), middle mold (2) and lower mold (3) are arranged from top to bottom. The upper mold (1) and lower mold (3) are respectively provided with a number of upper gates (11) and lower gates (31). The feature is that the middle mold (2) includes a middle frame (21), a wax mold (22) disposed on the inner side of the middle frame (21), a casting part (23) disposed on the inner side of the middle frame (21) and located in the wax mold (22), a positioning frame (24) respectively disposed on the inner edge of the top and the inner edge of the bottom of the middle frame (21), and a plurality of gaskets (25) respectively disposed on the top and bottom of the casting part (23) and extending from the end face of the wax mold (22), wherein the outer end face of the gaskets (25) and the outer end face of the wax mold (22) are flush with the end face of the middle frame (21); The bottom of the upper mold (1) and the top of the lower mold (3) are respectively provided with a first spiral groove (4) and a second spiral groove (5) corresponding to the positioning frame (24). The positioning frame (24) at the top of the middle frame (21) is embedded in the first spiral groove (4), and the positioning frame (24) at the bottom of the middle frame (21) is embedded in the second spiral groove (5).

2. The manufacturing mold for the skin lattice structure according to claim 1, characterized in that, The upper mold (1) includes an upper frame (12) and an upper heat sink (13) disposed on the inner side of the upper frame (12). The first spiral groove (4) is opened at the bottom of the upper frame (12). The upper gate (11) is opened on the upper heat sink (13), and all the upper gates (11) are arranged in a rectangular array.

3. The manufacturing mold for the skin lattice structure according to claim 2, characterized in that, The lower mold (3) includes a lower frame (32) and a lower heat sink (33) disposed on the inner side of the lower frame (32). The second spiral groove (5) is opened on the top of the lower frame (32). The lower gate (31) is opened on the lower heat sink (33). All the lower gates (31) are arranged in a rectangular array and correspond one-to-one with the upper gate (11). The upper gate (11) and the lower gate (31) are arranged alternately with the gasket (25).

4. The manufacturing mold for the skin lattice structure according to claim 3, characterized in that, The outer and inner sides of the upper frame (12) are flush with the outer and inner sides of the middle frame (21), and the outer and inner sides of the lower frame (32) are flush with the outer and inner sides of the middle frame (21).

5. The manufacturing mold for the skin lattice structure according to any one of claims 1 to 4, characterized in that, The middle frame (21) is provided with a pushing mechanism (6) on both sides for pushing the upper mold (1) and the lower mold (3) away from each other and demolding.

6. The manufacturing mold for the skin lattice structure according to claim 5, characterized in that, The middle frame (21) has a first hole (211), a second hole (212), a third hole (213), a fourth hole (214) and a fifth hole (215) in sequence from top to bottom near the outer edge. The outer side of the middle frame (21) has a horizontal hole (216) that is perpendicular to and connected to the third hole (213). The pushing mechanism (6) includes a push rod (61) that slides through the transverse hole (216) and extends into the third hole (213); an upper rod (62) that slides in the first hole (211) and the second hole (212) and corresponds to the push rod (61); a lower rod (63) that slides in the fourth hole (214) and the fifth hole (215) and corresponds to the push rod (61); a first spring (64) that is installed in the second hole (212) and sleeved on the outer wall of the upper rod (62); and a spring installed in the third hole (213). The second spring (65) is located inside the fourth hole (214) and sleeved on the outer wall of the lower rod (63). The diameter of the first hole (211) is smaller than the diameter of the second hole (212) and matches the diameter of the upper rod (62). The diameter of the fifth hole (215) is smaller than the diameter of the fourth hole (214) and matches the diameter of the lower rod (63). The bottom end of the first spring (64) is connected to the outer wall of the upper rod (62), and the top end of the second spring (65) is connected to the outer wall of the lower rod (63).

7. The manufacturing mold for the skin lattice structure according to claim 6, characterized in that, When the end of the push rod (61) contacts the inner wall of the third hole (213), the upper rod (62) extends out from the first hole (211) and the lower rod (63) extends out from the fifth hole (215).

8. The manufacturing mold for the skin lattice structure according to claim 6, characterized in that, The upper rod (62) and the lower rod (63) are close to each other at one end and have an arc-shaped structure. The end of the push rod (61) located in the third hole (213) is also arc-shaped.

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