Middle mold for casting skin lattice plate and casting method

Abstract

The middle mold for casting the skin dot matrix plate comprises a hollow middle frame body and a filling body arranged in a hollow structure of the middle frame body in a filling mode, middle frame base plates arranged on the surface of the middle frame body in an attached mode are arranged on the two sides of the middle frame body, and the middle frame base plates are arranged around the filling body. The middle frame base plates located on the two sides of the middle frame body are flush with the surfaces of the two sides of the filling body correspondingly. A plurality of positioning reference components which are simultaneously embedded on the middle frame base plate and the middle frame main body are arranged between the middle frame base plate and the middle frame main body; compared with the prior art, the surface precision and thickness of the skin dot matrix plate are controlled by milling the filling main body and controlling the milling precision, the filling main body at the non-milled position forms a positioning platform for subsequent die assembly, and meanwhile, the middle frame main body and the middle frame base plate are used for loading the filling main body and supporting the positioning reference component at the same time; and the middle frame main body does not influence the filling main body in the casting process of the skin dot matrix plate.

Description

Technical Field

[0001] The invention relates to the technical field of skin lattice plates, and in particular to a middle mold for casting skin lattice plates and a casting method. Background Art

[0002] With the innovative development of aerospace technology and its deep integration with the civilian field, satellite communications, satellite navigation, satellite remote sensing, etc. have gradually served various industries in the field of people's livelihood and cultivated new economic growth points. High strength and light weight have always been the goals pursued by satellite structural materials. The three-dimensional lattice structure is a new type of structural material with light weight, high specific strength, high specific stiffness and multifunctional potential. Among them, the skin lattice structure is an ideal material for satellite structural plates, which consists of two layers of thin-walled skin and a regularly arranged lattice structure in the middle.

[0003] Among them, the titanium alloy skin lattice panel has excellent properties such as light weight, high specific strength, high specific stiffness, heat insulation, sound absorption and noise reduction, and is widely used in the aerospace field.

[0004] Existing titanium alloy skin lattice plates are usually formed by additive printing or mold casting. When ultra-thin skin lattice plates need to be cast, the additive printing method will greatly increase the casting cost of the skin lattice plates, and the mold casting method will inevitably cause deformation due to heat or other operations during the mold baking process, making it difficult to obtain high-precision skin lattice plates.

[0005] At the same time, in the mold casting process of the titanium alloy skin lattice plate, it usually includes an upper mold, a middle mold and a lower mold that cooperate in sequence. A wax mold is provided in the middle mold, and a cavity for casting the skin lattice plate is formed between the wax mold and the upper mold and the lower mold.

[0006] Chinese application number CN201811443740.7 discloses a high-temperature resistant titanium alloy skin with a yield strength greater than 1800MPa, its production method, application and high-temperature resistant titanium alloy skin material. The method comprises the following steps: 1) producing a high-temperature resistant titanium alloy skin material; 2) processing the high-temperature resistant titanium alloy skin material obtained in step 1) into a formed skin structure; 3) subjecting the formed skin structure obtained in step 2) to sequential heating, quenching and tempering treatments, and then cooling and removing the surface oxide scale to produce a high-temperature resistant titanium alloy skin.

[0007] The skin structure disclosed above requires a corresponding molding mold during the production process. When the mold is used to prepare the high-temperature resistant titanium alloy skin material, the mold will inevitably deform due to heat or other operations during the mold baking process, making it difficult to obtain high-precision high-temperature resistant titanium alloy skin material, thereby affecting the structural accuracy and subsequent use of the overall skin structure. Summary of the invention

[0008] The present invention aims to overcome the defects in the prior art and provide a middle mold and a casting method for casting skin lattice plates with high casting precision and no external influence.

[0009] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical scheme: a middle mold for casting skin lattice panels, comprising a hollow middle frame body and a filling body filled in the hollow structure of the middle frame body, middle frame pads fitted on the surface of the middle frame body are provided on both sides of the middle frame body, the middle frame pads are arranged around the filling body, and the middle frame pads located on both sides of the middle frame body are respectively flush with the two side surfaces of the filling body; a plurality of positioning reference components are provided between the middle frame pad and the middle frame body, which are embedded on the middle frame pad and the middle frame body at the same time.

[0010] As a preferred solution of the present invention, the positioning reference member is embedded in each side edge of the middle frame pad and the middle frame body, and the positioning reference member, the middle frame pad and the filling body are flush with each other.

[0011] As a preferred solution of the present invention, the surface of the positioning reference component after partial milling and the surface of the filling body form a reference surface located in the same plane.

[0012] As a preferred solution of the present invention, a sink consistent with the required skin thickness is milled on the surface of the filling body, and the unmilled surface of the filling body forms a positioning platform arranged around the sink.

[0013] As a preferred solution of the present invention, the filling body includes a wax model and gypsum filled in the wax model.

[0014] As a preferred solution of the present invention, a blind hole for embedding the positioning reference component is formed on the middle frame body, and a through hole for embedding the positioning reference component is formed on the middle frame pad.

[0015] A method for casting a middle mold for casting a skin lattice plate, based on the middle mold for casting a skin lattice plate, comprises the following steps: Step A: assembling the middle mold, installing the wax mold in the hollow structure of the middle frame body, and installing the middle frame pads arranged around the wax mold and the positioning reference components for connecting the middle frame pads on both sides of the middle frame body; Step B: middle mold forming, embedding the assembled middle mold with plaster to form a filling body; Step C: middle mold processing, taking out the middle mold embedded with gypsum, and removing the middle frame pads on both sides of the middle frame body, the surface of the wax mold and the positioning reference component is higher than the surface of the middle frame body; Step D: Processing the reference surface, milling the two sides of the center mold, so that the surface of the wax mold and the surface of the positioning reference component completed by milling are on the same plane, and this plane forms the reference plane of the skin lattice plate; Step E: sinking platform processing, using the reference surface in step D to perform downward milling on the surface of the filling body to form a sinking platform, and the surface of the filling body that has not been milled forms a positioning platform; Step F: Cast the finished product. Using the positioning platform as a reference, assemble the middle mold with the sinking platform with the upper mold and the lower mold. After baking and casting, the finished skin lattice panel can be obtained.

[0016] As a preferred solution of the present invention, in step D, after the two sides of the middle mold are milled, the surface thickness difference on the two sides of the middle mold is the required thickness of the finished skin lattice structure.

[0017] As a preferred solution of the present invention, the depth of the sink in step E is the required area size and skin depth of the skin matrix plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are: by milling the filling body, the surface accuracy and thickness of the skin lattice plate can be controlled by controlling the milling accuracy, and the casting of the skin lattice plate with ultra-thin skin can be satisfied by the milling amount on the surface of the filling body. The filling body at the unmilled part forms a positioning platform for subsequent mold closing. At the same time, the middle frame body and the middle frame pad of the present application are used to load the filling body and support the positioning reference component at the same time. The middle frame body has no effect on the filling body during the casting process of the skin lattice plate.

[0019] At the same time, a gypsum sink is formed after milling the filling body. The surface of this gypsum boss is milled with the positioning reference component as the reference surface accuracy. When assembling with the pouring system components, the gypsum middle mold needs to be precisely assembled with the gate and riser components. In this way, there is assembly accuracy, and installation based on the surface of the gypsum boss as the installation reference can ensure installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is an exploded view of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the middle frame after the middle frame pad is removed; Figure 5 This is the milling diagram of the middle frame; Figure 6 It is a schematic diagram of the middle frame structure after the middle frame pad is removed; Figure 7 It is a schematic diagram of the middle frame structure after milling; Figure 8 This is the cross-sectional view of the middle frame after milling; Reference numerals: middle frame body 1 , blind hole 11 , filling body 2 , wax mold 21 , gypsum 22 , positioning platform 23 , middle frame pad 3 , through hole 31 , positioning reference component 4 , sinking platform 5 , reference surface 6 . DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-Figure 8 As shown, a middle mold for casting a skin lattice plate comprises a middle frame body 1 with a hollow arrangement and a filling body 2 arranged in a filling manner in the hollow structure of the middle frame body 1, middle frame pads 3 are arranged on both sides of the middle frame body 1 in a fitting manner on the surface of the middle frame body 1, the middle frame pads 3 are arranged around the filling body 2, and the middle frame pads 3 located on both sides of the middle frame body 1 are respectively flush with the two side surfaces of the filling body 2; a plurality of positioning reference components 4 are arranged between the middle frame pads 3 and the middle frame body 1 and are embedded in the middle frame pads 3 and the middle frame body 1 at the same time.

[0023] The middle frame body 1 is a rectangular hollow frame structure. The size of the filling body 2 corresponds to the hollow size of the middle frame body 1, and the filling body 2 is used to form a mold body for casting the skin lattice plate. When the middle frame pad 3 is installed on the surface of the middle frame body 1, the inner circle of the middle frame pad 3 is in contact with the outer circle of the filling body 2.

[0024] The number of the positioning reference components 4 is set according to actual needs. The positioning reference components 4 are used to realize the positioning of the middle frame pad 3 on the middle frame body 1, and are also used to form a positioning reference for subsequent processing.

[0025] Both sides of the filling body 2 extend outward along the thickness direction of the middle frame body 1, the thickness of the filling body 2 is greater than the thickness of the middle frame body 1, and the thickness of both sides of the filling body 2 extending outward along the thickness direction of the middle frame body 1 is consistent, and the height difference between the surface of the filling body 2 and the surface of the adjacent middle frame body 1 is equal to the thickness of the middle frame pad 3.

[0026] The middle frame pad 3 is a hollow frame structure, and the cross-sectional dimensions of the middle frame pad 3 are consistent with the cross-sectional dimensions of the middle frame body 1. When the middle frame pad 3 is fittedly arranged on the surface of the middle frame body 1, the inner circle and outer circle of the middle frame pad 3 are flush with the inner circle and outer circle of the middle frame body 1.

[0027] By milling the surface of the positioning reference component 4 and the surface of the filling body 2, the surface of the positioning reference component 4 and the surface of the filling body 2 after partial milling form a reference surface 6 located in the same plane, thereby meeting the subsequent milling requirements.

[0028] The surface of the filling body 2 is milled with a sinker 5 that is consistent with the required skin thickness, and the unmilled surface of the filling body 2 forms a positioning platform 23 arranged around the sinker 5. The size of the sinker 5 is the size and thickness of the skin to be formed subsequently, and the positioning platform 23 facilitates the positioning and installation of the upper mold and the lower mold during the subsequent mold closing.

[0029] Therefore, the middle frame pad 3 and the inner circle of the middle frame body 1 are in contact with the filling body 2 at the same time, and the flush middle frame pad 3 and the outer circle of the middle frame body 1 reduce the influence of external force on the middle frame pad 3 or the middle frame body 1.

[0030] The filling body 2 includes a wax model 21 and gypsum 22 filled in the wax model 21 . The structure of the wax model 21 is designed according to the skin lattice plate, and the gypsum 22 is filled in various spaces inside the wax model 21 .

[0031] The positioning reference member 4 is embedded in each side edge of the middle frame pad 3 and the middle frame body 1 , and the surfaces of the positioning reference member 4 , the middle frame pad 3 and the filling body 2 are flush.

[0032] Each side edge of the middle frame pad 3 and the middle frame body 1 is connected via a positioning reference component 4, thereby ensuring that each side edge of the middle frame pad 3 is positioned and connected to the middle frame body 1, ensuring accurate positioning of the middle frame pad 3 on the middle frame body 1.

[0033] A blind hole 11 for embedding the positioning reference member 4 is formed on the middle frame body 1, and a through hole 31 for embedding the positioning reference member 4 is formed on the middle frame pad 3. The blind hole 11 is used to support the bottom of the positioning reference member 4. At the same time, the cross-sectional size of the blind hole 11 is consistent with the cross-sectional size of the positioning reference member 4, ensuring the precise positioning of the positioning reference member 4 on the middle frame body 1.

[0034] The through hole 31 is used to pass through the positioning reference component 4, and the cross-sectional size of the through hole 31 is also consistent with the cross-sectional size of the positioning reference component 4, so as to ensure the precise positioning of the middle frame pad 3 on the positioning reference component 4. Under the transition effect of the positioning reference component 4, the precise positioning of the middle frame pad 3 on the middle frame body 1 is achieved.

[0035] The positioning reference components 4 on both sides of the middle frame body 1 are located at corresponding positions, so that the positioning reference components 4 on both sides of the middle frame body 1 form corresponding reference surfaces 6 .

[0036] A method for casting a middle mold for casting a skin lattice plate, based on the middle mold for casting a skin lattice plate, comprises the following steps: Step A: assembling the middle mold, installing the wax mold 21 in the hollow structure of the middle frame body, and installing the middle frame pad 3 arranged around the wax mold 21 and the positioning reference component 4 used to connect the middle frame pad 3 on both sides of the middle frame body 1.

[0037] During the assembly process of the middle mold, the middle frame pad 3 is installed on the opposite sides of the middle frame body 1 through the positioning reference component 4, and the wax mold 21 is installed in the middle frame body 1. The height of the wax mold 21 is set to P, the height of the middle frame body 1 is set to X, and the height of the middle frame pad 3 is set to Y. The surface of the assembled middle frame pad 3 is required to be flush with the surface of the wax mold 21, then Y= / 2.

[0038] Step B: middle mold forming, embedding the assembled middle mold with plaster to form a filling body 2, so that the wax mold 21 is filled with plaster 22.

[0039] Step C: middle mold processing, taking out the middle mold embedded with gypsum, and removing the middle frame pads 3 on both sides of the middle frame body 1, the surface of the wax mold 21 and the positioning reference member 4 is higher than the surface of the middle frame body 1, and the positioning reference member 4 is still embedded in the blind hole 11 of the middle frame body 1, and the positioning reference member 4 and the wax mold 21 are exposed on the middle frame body 1.

[0040] Step D: Processing the reference surface, milling the two sides of the center mold, so that the surface of the wax mold 21 and the surface of the positioning reference component 4 after milling are on the same plane, and this plane forms the reference plane 6 of the skin lattice plate.

[0041] During the milling process, one of the positioning reference components 4 is milled first, and then the other positioning reference components 4 are milled in sequence based on the surface of the positioning reference component 4, ensuring that all the surfaces of the positioning reference components 4 are on the same plane, and then the surface of the filling body 2 is milled based on the plane where the surfaces of all the positioning reference components 4 are located, ensuring that the filling body 2 after milling and the positioning reference component 4 after milling are on the same plane.

[0042] The two sides of the center mold are milled separately. During the milling process, the surface of the positioning reference component 4 and the surface of the wax mold 21 are milled. Under the action of milling, the surface of the positioning reference component 4 and the surface of the wax mold 21 are located on the same plane, thereby eliminating the installation error of the positioning reference component 4, and forming two milled reference surfaces 6 on both sides of the center mold.

[0043] After milling both sides of the middle mold, the surface thickness difference on both sides of the middle mold is the required thickness of the finished skin lattice structure. The thickness difference on the upper and lower sides of the positioning reference component 4 after milling is H, which is the required thickness of the finished skin lattice structure.

[0044] Step E: Sinking platform processing, the surface of the filling body 2 is milled downward with the reference plane 6 in step D to form a sinking platform 5, and the unmilled surface of the filling body 2 forms a positioning platform 23. At this time, the positioning platform 23 and the positioning reference component 4 are located on the same plane, and the sinking platform 5 and the positioning platform 23 are in a parallel state with each other.

[0045] The horizontal area of ​​the sink 5 does not need to be smaller than the wax model 21, so sinks 5 of different areas and depths can be milled downward on the wax model 21 according to actual needs to obtain skin lattice panels with different area sizes and skin depths.

[0046] The sink depth is the required area size and skin depth of the skin lattice plate, so the milling depth and milling area of ​​the sinks 5 on both sides of the middle mold can be controlled according to the required area size and skin depth of the skin lattice plate.

[0047] Step F: Casting the finished product. Using the positioning platform 23 as a reference, assemble the middle mold formed with the sink 5 with the upper mold and the lower mold. After baking and casting, the finished skin matrix panel can be obtained.

[0048] During the pouring process, the required skin lattice plate is located in the middle of the middle frame body 1 and is not affected by the heat or force of the middle frame body 1. There is a circle of milled gypsum bosses around the sinker 5. The surface of the gypsum boss is milled with the positioning reference member 4 as the reference surface accuracy. When assembling with the pouring system components, the middle mold needs to be precisely assembled with the gate and riser components. In this way, there is assembly accuracy, and the installation using the surface of the gypsum boss as the installation reference can ensure the installation accuracy.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0050] Although the following terms are used more frequently in this article: middle frame body 1, blind hole 11, filling body 2, wax mold 21, plaster 22, positioning platform 23, middle frame pad 3, through hole 31, positioning reference member 4, sink 5, reference surface 6, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A middle mold for casting a skin matrix plate, comprising a middle frame body (1) arranged in a hollow manner and a filling body (2) arranged in a filling manner in the hollow structure of the middle frame body (1), characterized in that: The middle frame main body (1) is provided with middle frame pads (3) on both sides thereof and are fittedly arranged on the surface of the middle frame main body (1); the middle frame pads (3) are arranged around the filling main body (2), and the middle frame pads (3) located on both sides of the middle frame main body (1) are respectively flush with the two side surfaces of the filling main body (2); and a plurality of positioning reference components (4) are provided between the middle frame pads (3) and the middle frame main body (1) and are simultaneously embedded on the middle frame pads (3) and the middle frame main body (1).

2. The middle mold for casting skin matrix panels according to claim 1, characterized in that: The positioning reference component (4) is embedded in each side edge of the middle frame pad (3) and the middle frame main body (1), and the surfaces of the positioning reference component (4), the middle frame pad (3) and the filling main body (2) are flush.

3. The middle mold for casting skin lattice panels according to claim 2, characterized in that: The surface of the positioning reference component (4) after partial milling and the surface of the filling body (2) form a reference surface (6) located in the same plane.

4. The middle mold for casting skin matrix panels according to claim 1, characterized in that: The middle frame body (1) is a frame-shaped structure, and two sides of the filling body (2) extend outwards along the thickness direction of the middle frame body (1).

5. The middle mold for casting skin matrix panels according to claim 4, characterized in that: The surface of the filling body (2) is milled with a sink (5) that is consistent with the required skin thickness, and the surface of the filling body (2) that is not milled forms a positioning platform (23) that is arranged around the sink (5).

6. The middle mold for casting skin matrix panels according to claim 1, characterized in that: The filling body (2) comprises a wax model (21) and gypsum (22) filled in the wax model (21).

7. The middle mold for casting skin matrix panels according to claim 1, characterized in that: A blind hole (11) for engaging the positioning reference component (4) is formed on the middle frame body (1), and a through hole (31) for engaging the positioning reference component (4) is formed on the middle frame pad (3).

8. A method for casting a middle mold for casting a skin lattice plate, based on the middle mold for casting a skin lattice plate according to any one of claims 1 to 7, comprising the following steps: Step A: assembling the middle mold, installing the wax mold (21) in the hollow structure of the middle frame body (1), and installing a middle frame pad (3) arranged around the wax mold (21) and a positioning reference component (4) for connecting the middle frame pad (3) on both sides of the middle frame body (1); Step B: forming the middle mold, embedding the assembled middle mold with plaster to form a filling body (2); Step C: middle mold processing, taking out the middle mold after plaster embedding, and removing the middle frame pads (3) on both sides of the middle frame body (1), the surface of the wax mold (21) and the positioning reference component (4) are higher than the surface of the middle frame body (1); Step D: machining the reference surface, milling the two sides of the center mold, so that the surface of the wax mold (21) and the surface of the positioning reference component (4) completed by milling are on the same plane, and the plane forms the reference plane (6) of the skin lattice plate; Step E: sinking platform processing, using the reference plane (6) in step D to mill the surface of the filling body (2) downward to form a sinking platform (5), and the surface of the filling body (2) that has not been milled forms a positioning platform (23); Step F: Casting the finished product, using the positioning platform (23) as a reference, assembling the middle mold formed with the sink (5) with the upper mold and the lower mold, and after baking and casting, a finished skin matrix panel can be obtained.

9. A method for casting a middle mold for casting a skin matrix panel according to claim 8, characterized in that: In step D, after milling the two sides of the middle mold, the surface thickness difference on the two sides of the middle mold is the required thickness of the finished skin lattice structure.

10. A method for casting a middle mold for casting a skin matrix panel according to claim 8, characterized in that: The depth of the sink in step E is the required area size and skin depth of the skin matrix plate.

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