High temperature resistant ultra-thin wall packaging shell and forming method thereof

Abstract

A high temperature resistant ultra-thin wall packaging shell belongs to the technical field of high temperature resistant material packaging for aircraft. It includes a shell body, the shell body includes a shell bottom and a shell top, and the shell top is provided with a flange; the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and the surrounding edge of the shell body is a rounded transition structure. The present invention also provides a forming method for a high temperature resistant ultra-thin wall packaging shell. The high temperature resistant ultra-thin wall packaging shell provided by the present invention adopts a box-shaped integrated structure with a flange and rounded transition, which has both lightweight and high structural reliability, avoids stress concentration at sharp corners, and solves the problem of welding tearing; the present invention realizes the integrated forming of the packaging structure, with a short preparation process, small material performance loss, high reliability, and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of high temperature resistant material packaging for aircraft, and more specifically, to a high temperature resistant ultra-thin wall packaging shell and a forming method of the high temperature resistant ultra-thin wall packaging shell. Background Art

[0002] The aircraft external heat protection solution is the main option for aircraft body heat protection because of its light weight and conducive to the design of the body load-bearing structure. Since metal materials have inherent advantages in environmental tolerance, metal materials can be used to encapsulate thermal insulation materials to form an integrated heat-insulating structure, solve the problem of environmental adaptability, and meet the requirements of flight environment use.

[0003] The harsh flight thermal environment and extremely low structural mass ratio of high-speed aircraft require that structural materials meet the requirements of high temperature resistance and lightweight. Traditional packaging structures generally adopt the method of flanged or bent sheet metal parts and then welded. This method has many welds, heavy mass, poor structural reliability, and stress concentration is easily caused at the sharp corners of the edge sealing. Under aerodynamic heating conditions, the welds are easily torn, resulting in failure of the external protection of the fuselage, which directly threatens flight safety. Therefore, high-temperature resistant ultra-thin-wall integrated packaging structure has become a feasible packaging structure solution.

[0004] However, there are a series of technological difficulties in the forming of high-temperature resistant ultra-thin-wall integrated packaging structures. For example, the material forming performance is greatly reduced due to the "wall thickness effect", which can easily lead to excessive thinning of local wall thickness or even cracking. At the same time, ultra-thin-wall materials intensify the degree of springback, making it more difficult to control the forming accuracy. Summary of the invention

[0005] 1. Technical issues:

[0006] In summary, how to provide a high-temperature resistant ultra-thin-wall packaging structure and a forming method thereof that are both lightweight and highly reliable in structure, in order to overcome the deficiencies of the prior art, has become an urgent problem to be solved by those skilled in the art.

[0007] (II) Technical solution:

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a high-temperature resistant ultra-thin-wall packaging shell. In the present invention, the high-temperature resistant ultra-thin-wall packaging shell includes a shell body, the shell body includes a shell bottom and a shell top arranged opposite to the shell bottom, the shell top is a packaging opening, and a flange is arranged around the shell top; the high-temperature resistant ultra-thin-wall packaging shell is a box-shaped integrated structure, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and the surrounding edge of the shell body is a rounded transition structure.

[0010] Preferably, in the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the midline of the length direction of the shell body is taken as the center of symmetry, the shell bottom is a downward curved surface structure, the shell top is a downward curved surface structure, and the curvature of the shell bottom is consistent with that of the shell top.

[0011] Preferably, in the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the midline of the shell body in the width direction is taken as the center of symmetry, the shell bottom is a downward curved surface structure, the shell top is a downward curved surface structure, and the curvature of the shell bottom is consistent with that of the shell top.

[0012] Preferably, in the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the high temperature resistant ultra-thin wall packaging shell is made of high temperature resistant metal thin plate, the temperature resistant metal thin plate has a temperature range of 800°C-1100°C, and a thickness range of 0.1mm-0.5mm.

[0013] Preferably, in the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the high temperature resistant metal thin plate material is a high temperature alloy or a titanium-aluminum based intermetallic compound.

[0014] Preferably, in the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the depth of the shell body ranges from 10mm to 25mm; the radius size range of the rounded corner transition structure ranges from R2mm to R8mm; and the width size range of the flange ranges from 2mm to 8mm.

[0015] The present invention also provides a method for forming a high temperature resistant ultra-thin wall packaging shell, and the method for forming a high temperature resistant ultra-thin wall packaging shell comprises the following steps:

[0016] Step 1: Select the material of the high temperature resistant thin plate. The temperature range of the high temperature resistant thin plate is 800°C-1100°C, and the thickness of the high temperature resistant thin plate is selected in the range of 0.1mm-0.5mm.

[0017] Step 2: Design of packaging structure: the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure provided with a flange, and the high temperature resistant ultra-thin wall packaging shell adopts a rounded transition structure;

[0018] Step 3: forming the main body of the ultra-thin-wall shell, using a liquid filling deep drawing process to flexibly form the high-temperature resistant thin plate;

[0019] Step 4: Springback compensation of the ultra-thin-wall shell body: perform a three-dimensional scan on the ultra-thin-wall shell body formed in step 3, compare the scanned contour with the model contour to obtain compensation data, and perform springback compensation by changing the mold surface;

[0020] Step 5: Process the welding surface. After the springback compensation in step 4, trim the ultra-thin-wall shell body, and keep the flange surface width in the range of 2mm-5mm for welding during vacuum packaging.

[0021] Preferably, in the forming method of the high temperature resistant ultra-thin wall packaging shell provided by the present invention, in the step 1, the high temperature resistant thin plate material is a high temperature alloy or a titanium aluminum based intermetallic compound.

[0022] Preferably, in the forming method of the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the high temperature resistant thin plate is cut by laser.

[0023] Preferably, in the forming method of the high-temperature resistant ultra-thin-wall packaging shell provided by the present invention, in the step two, the high-temperature resistant ultra-thin-wall packaging shell has a shell body, the top surface of the shell body is provided with a flange, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and its surrounding edge is a rounded transition structure; the depth dimension range of the shell body is 10mm-25mm, the radius of the rounded transition structure is R2mm-R8mm, and the width dimension range of the flange is 2mm-8mm.

[0024] Preferably, in the forming method of the high-temperature resistant ultra-thin-wall packaging shell provided by the present invention, in the step three, the punching pressure and the edge clamping force of the plate are individually controlled by a double-acting hydraulic press, and the liquid filling pressure is controlled by an ultra-high pressure water system to achieve flexible forming of the plate by liquid filling deep drawing.

[0025] Preferably, in the forming method of the high temperature resistant ultra-thin wall packaging shell provided by the present invention, in the step three, lubricating oil is applied to the sheet material to increase the flowability of the material during the liquid filling deep drawing flexible forming process.

[0026] Preferably, in the forming method of the high-temperature resistant ultra-thin-wall packaging shell provided by the present invention, in the step four, the ultra-thin-wall shell body after forming is three-dimensionally scanned, and a compensation plan is formulated according to the springback calculation results; the compensation plan formulated according to the springback calculation results is: the springback compensation is handled symmetrically, the compensation value of the middle part of the length direction or width direction of the ultra-thin-wall shell body is 0, the maximum compensation value at the farthest end of the front and rear flanges is 3.5 mm, and the compensation ratio is 1:0.8. The mold surface is changed accordingly according to the compensation plan, and after a second deep drawing, the ultra-thin-wall shell body after springback compensation is obtained.

[0027] Preferably, in the forming method of the high temperature resistant ultra-thin wall packaging shell provided by the present invention, the contour of the ultra-thin wall shell body is within 0.5 mm.

[0028] (III) Beneficial effects:

[0029] The present invention provides a high temperature resistant ultra-thin wall packaging shell, the high temperature resistant ultra-thin wall packaging shell includes a shell body, the shell body includes a shell bottom and a shell top arranged opposite to the shell bottom, the shell top is a packaging opening, and a flange is arranged around the shell top; the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and the surrounding edge of the shell body is a rounded transition structure. The present invention also provides a forming method of a high temperature resistant ultra-thin wall packaging shell, the forming method of the high temperature resistant ultra-thin wall packaging shell includes: step one, selecting a high temperature resistant thin plate material; step two, designing a packaging structure; step three, forming an ultra-thin wall shell body; step four, compensating for the rebound of the ultra-thin wall shell body; step five, processing the welding surface.

[0030] Through the above structural design, the present invention has the following beneficial effects compared with the prior art:

[0031] 1. The high temperature resistant ultra-thin wall packaging shell provided by the present invention adopts an integrated box-shaped structure with a flange and rounded corners, which has both light weight and high structural reliability, avoids stress concentration at sharp corners, and solves the problem of welding tearing;

[0032] 2. The present invention solves the problem of excessive thinning and rebound of local wall thickness caused by "wall thickness effect" through liquid-filled flexible forming and rebound compensation, and realizes the precision forming of lightweight shell body;

[0033] 3. The present invention realizes the integrated forming of the packaging structure, with a short preparation process, small material performance loss, high reliability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. 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. Among them:

[0035] Figure 1 This is a schematic diagram of the structure of a high temperature resistant ultra-thin wall packaging shell in an embodiment of the present invention;

[0036] Figure 2 The present invention is a flowchart of a method for forming a high temperature resistant ultra-thin wall packaging shell in one embodiment of the present invention.

[0037] exist Figure 1 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0038] Flange 1, rounded corner transition structure at the connection position between the flange and the shell body 2, rounded corner transition structure at the connection position between the shell bottom of the shell body and the surrounding edge of the shell body 3, shell bottom 4. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0040] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the structure of a high temperature resistant ultra-thin wall packaging shell in an embodiment of the present invention; Figure 2 The present invention is a flowchart of a method for forming a high temperature resistant ultra-thin wall packaging shell in one embodiment of the present invention.

[0042] The present invention provides a high temperature resistant ultra-thin wall packaging shell. In the present invention, in order to facilitate the structural description, the high temperature resistant ultra-thin wall packaging shell includes two parts, namely a shell body and a flange 1. The shell body is a box-shaped structure, and the shell body includes a shell bottom 4 (in Figure 1 In the main view, the bottom of the shell body is the shell bottom 4) and the shell top (in Figure 1 In the figure, in the main viewing angle, the top of the shell body is the shell top, and the shell top is provided with a flange 1), the shell top is a packaging opening, and a flange 1 is provided around the edge of the shell top. Specifically, the flange 1 is an annular smooth curved surface structure.

[0043] In order to avoid the problem of stress concentration at sharp structures and easy tearing of welds, the present invention proposes the following design: the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure, the connection between the flange 1 and the shell body is a rounded transition structure 2, and the connection between the shell bottom 4 of the shell body and the surrounding edge of the shell body is a rounded transition structure 3. In addition, in the present invention, except for the above-mentioned limited parts, other corners of the high temperature resistant ultra-thin wall packaging shell all adopt rounded transition structures.

[0044] As can be seen from the above, the shell body is a box-shaped structure, and further, the shell body is a curved box-shaped structure. Specifically, with the midline of the length direction of the shell body as the symmetry center, the shell bottom 4 is a downward curved surface structure, the shell top (i.e., flange 1) is a downward curved surface structure, and the curvature of the shell bottom 4 is consistent with that of the shell top; or, with the midline of the width direction of the shell body as the symmetry center, the shell bottom is a downward curved surface structure, the shell top is a downward curved surface structure, and the curvature of the shell bottom is consistent with that of the shell top.

[0045] In the present invention, the high temperature resistant ultra-thin wall packaging shell is made of a high temperature resistant metal sheet, the temperature range of the high temperature resistant metal sheet is 800°C-1100°C, and the thickness range is 0.1mm-0.5mm. Specifically, the high temperature resistant metal sheet is a high temperature alloy or a titanium aluminum-based metal compound, or other metal materials that meet the above temperature range.

[0046] Specifically, the depth of the shell body ranges from 10mm to 25mm; the radius size range of the rounded corner transition structure (the rounded corner transition structure 2 at the connection between the flange and the shell body and the rounded corner transition structure 3 at the connection between the shell bottom of the shell body and the surrounding edge of the shell body) is R2mm-R8mm; the width size range of the flange 1 is 2mm-8mm.

[0047] The present invention also provides a method for forming a high temperature resistant ultra-thin wall packaging shell, and the method for forming a high temperature resistant ultra-thin wall packaging shell comprises the following steps:

[0048] Step 1: Select high temperature resistant thin sheet material.

[0049] The temperature range of the high temperature resistant thin plate is 800℃-1100℃, and the thickness of the high temperature resistant thin plate is selected in the range of 0.1mm-0.5mm.

[0050] Specifically, in step one, the high temperature resistant thin plate material is a high temperature alloy or a titanium-aluminum based intermetallic compound.

[0051] After the plate is selected, the high temperature resistant thin plate is cut by laser to ensure the cutting accuracy of the plate.

[0052] Step 2: Packaging structure design.

[0053] The high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure provided with a flange, and the high temperature resistant ultra-thin wall packaging shell adopts a rounded transition structure.

[0054] Specifically, in step two, the high-temperature resistant ultra-thin-wall packaging shell has a shell body, the top surface of the shell body is provided with a flange, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and its surrounding edge is a rounded transition structure; the depth dimension range of the shell body is 10mm-25mm, the radius of the rounded transition structure is R2mm-R8mm, and the width dimension range of the flange is 2mm-8mm.

[0055] Step 3: forming the main body of the ultra-thin wall shell.

[0056] The high temperature resistant thin sheet is flexibly formed by the liquid filling deep drawing process. Specifically, in step three, the punching force and the blank holding force of the sheet are individually controlled by the double-acting hydraulic press, and the liquid filling pressure is controlled by the ultra-high pressure water system to realize the liquid filling deep drawing flexible forming of the sheet. Furthermore, in step three, lubricating oil is applied to the sheet to increase the flowability of the material during the liquid filling deep drawing flexible forming process.

[0057] Step 4: Springback compensation of ultra-thin wall shell body.

[0058] The ultra-thin-wall shell body formed in step three is subjected to three-dimensional scanning, and the scanned contour is compared with the model contour to obtain compensation data, and springback compensation is performed by changing the mold surface.

[0059] Specifically, in step 4, a three-dimensional scan is performed on the formed ultra-thin-wall shell body, and a compensation scheme is formulated according to the springback calculation results. The compensation scheme is formulated according to the springback calculation results as follows: the springback compensation is processed symmetrically, the compensation value of the middle part of the length direction or width direction of the ultra-thin-wall shell body is 0, the maximum compensation value of the farthest end of the front and rear flanges is 3.5mm, and the compensation ratio is 1:0.8. According to the compensation scheme, the die surface is changed accordingly, and the ultra-thin-wall shell body after springback compensation is obtained after the second deep drawing, wherein the contour of the ultra-thin-wall shell body is within 0.5mm.

[0060] Step 5: Welding surface treatment.

[0061] The ultra-thin-wall shell body after springback compensation in step 4 is trimmed to retain a flange surface width range of 2mm-5mm for welding during vacuum packaging.

[0062] The present invention proposes a high-temperature resistant ultra-thin-wall packaging structure and a forming method thereof. As the core technical point of the present invention, the high-temperature resistant ultra-thin-wall packaging structure is an integrated structure with a flange (a flange structure is provided on the shell body), a rounded corner transition (the connection between the flange and the shell body and the connection between the shell bottom and the surrounding edge of the shell body both adopt rounded corner transition) and a box shape (the shape of the shell body is a box shape).

[0063] The high-temperature resistant ultra-thin-wall packaging structure proposed in the present invention adopts an integrated box-shaped structure with a flange and rounded corners, which has both lightweight and high structural reliability, avoiding stress concentration at sharp corners; it solves the excessive thinning and rebound of local wall thickness caused by the "wall thickness effect" through liquid-filled flexible forming and rebound compensation, and realizes the precise forming of the lightweight shell body; it realizes the integrated forming of the packaging structure, with a short preparation process, small material performance loss, high reliability and long service life.

[0064] Specifically, in the present invention, the forming method for the high temperature resistant ultra-thin wall packaging structure is as follows:

[0065] The first step is to select high temperature resistant thin plate materials.

[0066] The high temperature resistant ultra-thin wall packaging structure selects high temperature resistant metal thin plates such as high temperature alloys, titanium aluminum based metal compounds, etc. The temperature resistance range is 800℃-1100℃, and the thickness is selected from 0.1mm-0.5mm.

[0067] The second step is to design a high temperature resistant ultra-thin wall packaging structure.

[0068] The shell body is an integrated box-shaped structure with a flange and rounded transition. The depth (i.e. the depth of the shell body, or it can be understood as the height of the surrounding edge) ranges from 10mm to 25mm. The top surface of the shell body is a flange surface (a flange is provided, and the flange surface refers to the "surface" on which the flange is made). The flange of the shell body and the bottom of the box are transitioned with rounded corners. The radius of the rounded corner is R2mm-R8mm, and the width of the flange is 2mm-8mm.

[0069] The third step is to form the ultra-thin wall shell body.

[0070] After process testing, the optimized stamping blank shape is obtained, and laser cutting is used for sheet material cutting. After laser cutting, the ultra-thin wall shell body is flexibly formed by liquid deep drawing.

[0071] Specifically, the present invention controls the punching pressure, the blank holding force, etc. separately through a double-acting hydraulic press (one hydraulic press is used to punch and form the plate, and the other hydraulic press is used to hold the side of the plate) and controls the filling pressure through an ultra-high pressure water system. The material flowability is increased by applying lubricating oil, etc., and the wall thickness uniformity is controlled through the reasonable matching of the punching pressure, the blank holding force and the filling pressure to prevent cracking caused by excessive thinning of the local wall thickness.

[0072] Step 4: Springback compensation of curved shell body.

[0073] For the shell body with curved surface shape, the formed shell body is three-dimensionally scanned, and the scanned contour is compared with the model contour to obtain compensation data. Springback compensation is performed by changing the die surface according to a certain compensation ratio to obtain the shell body after springback compensation.

[0074] Step 5: Welding surface treatment.

[0075] After springback compensation, the shell body undergoes another trimming process to retain a flange surface width of 2mm-5mm as the welding surface for subsequent vacuum packaging.

[0076] As can be seen from the above, the present invention provides a high temperature resistant ultra-thin wall packaging shell, which includes a shell body, the shell body includes a shell bottom and a shell top arranged opposite to the shell bottom, the shell top is a packaging opening, and a flange is arranged around the shell top; the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure, the connection between the flange and the shell body is a rounded transition structure, and the connection between the shell bottom of the shell body and the surrounding edge of the shell body is a rounded transition structure. The present invention also provides a forming method of a high temperature resistant ultra-thin wall packaging shell, which includes: step one, selection of high temperature resistant thin plate material; step two, packaging structure design; step three, ultra-thin wall shell body forming; step four, ultra-thin wall shell body rebound compensation; step five, welding surface treatment.

[0077] Through the above structural design, the present invention has the following beneficial effects compared with the prior art:

[0078] 1. The high temperature resistant ultra-thin wall packaging shell provided by the present invention adopts an integrated box-shaped structure with a flange and rounded corners, which has both light weight and high structural reliability, avoids stress concentration at sharp corners, and solves the problem of welding tearing;

[0079] 2. The present invention solves the problem of excessive thinning and rebound of local wall thickness caused by "wall thickness effect" through liquid-filled flexible forming and rebound compensation, and realizes the precision forming of lightweight shell body;

[0080] 3. The present invention realizes the integrated forming of the packaging structure, with a short preparation process, small material performance loss, high reliability and long service life.

[0081] Based on the above scheme, a specific embodiment of the present invention is as follows:

[0082] Firstly, an integrated forming method was used to form a curved shell main structure sample with a projection size of 300mm×300mm×12mm and a curvature radius of R300.

[0083] Then implement the following steps:

[0084] The first step is to select high temperature resistant thin plate materials.

[0085] The material of the shell body with curved surface structure is GH4099 high temperature alloy thin plate, with temperature resistance above 900℃ and wall thickness of 0.2mm.

[0086] The second step is to design a high temperature resistant ultra-thin wall packaging structure.

[0087] The shell body of the curved surface structure is an integrated box-shaped structure with a flange fillet transition. The cross section is a single-curvature convex flange structure with a curvature radius of R300mm and a shell body depth of 12mm. A flange is set on the top surface of the shell body to form a flange surface. The flange of the shell body and the bottom of the box are transitioned with fillets. The radius of the fillet transition structure at the flange is R3mm, the radius of the fillet transition structure at the bottom of the box is R5mm, and the width of the flange is 3mm.

[0088] The third step is to form the ultra-thin wall shell body.

[0089] After process test optimization, a rectangular blank with rounded corners was selected and cut using a 1.5kW laser cutting machine. Then, a 350-ton liquid filling forming device was used for liquid filling deep drawing, with a working medium pressure of 25MPa. The forming process parameters are: punching force 200 tons, blank holding force 12 tons, hydraulic support 2MPa, and special drawing oil for lubrication. After the first liquid filling deep drawing, a curved box-shaped part was formed, and the maximum thinning rate was controlled within 10%.

[0090] Step 4: Springback compensation of curved shell body.

[0091] The curved box-shaped part after forming is scanned in three dimensions, and a compensation plan is formulated based on the springback calculation results. The compensation plan is: the springback compensation is handled symmetrically, the compensation value in the middle of the box-shaped part is 0, and the maximum compensation at the front and rear flanges is 3.5mm (the compensation ratio is 1:0.8). According to the compensation plan, the die surface is changed accordingly, and after one-pass deep drawing, the curved box-shaped part after springback compensation is obtained, and the contour is within 0.5mm.

[0092] Step 5: Welding surface treatment.

[0093] A 350-ton hydraulic press is used for trimming, and the trimming process parameters are: trimming force 200 tons, and blanking force 0.25 tons. After the trimming process, the flange width is retained at 3mm, and the curved shell main structure sample is prepared, with a projection size of 300mm×300mm×12mm and a curvature radius of R300.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high temperature resistant ultra-thin wall packaging shell, characterized in that: The housing body comprises a housing bottom and a housing top arranged opposite to the housing bottom, the housing top is a packaging opening, a flange is arranged around the housing top, and the flange is an annular smooth curved surface structure; The high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and the surrounding edge of the shell body is a rounded transition structure; Taking the midline of the length direction of the shell body as the symmetry center, the shell bottom is a downward curved surface structure, the shell top is a downward curved surface structure, and the curvature of the shell bottom is consistent with that of the shell top; Or, taking the midline of the width direction of the shell body as the symmetry center, the shell bottom is a downward curved surface structure, the shell top is a downward curved surface structure, and the curvature of the shell bottom is consistent with that of the shell top; The flexible forming is carried out by using the liquid filling deep drawing process, and the ultra-thin wall shell body after forming is 3D scanned, and a compensation plan is formulated according to the springback calculation results; The shell body adopts a liquid filling deep drawing process to flexibly form a high temperature resistant thin plate, and after the first liquid filling deep drawing, a curved box-shaped part is formed, and the maximum thinning rate is controlled within 10%; The springback compensation of the shell body is as follows: a three-dimensional scan is performed on the formed shell body, the scanned contour is compared with the model contour to obtain compensation data, springback compensation is performed by changing the die surface, and a compensation plan is formulated based on the springback calculation results: the springback compensation is handled symmetrically, the compensation value of the middle part of the length or width direction of the shell body is 0, the maximum compensation value of the farthest end of the front and rear flanges is 3.5mm, and the compensation ratio is 1:0.

8. The die surface is changed accordingly according to the compensation plan, and the shell body after springback compensation is obtained through a second deep drawing, wherein the contour of the shell body is within 0.5mm.

2. The high temperature resistant ultra-thin wall packaging shell according to claim 1, characterized in that: The high temperature resistant ultra-thin wall packaging shell is made of a high temperature resistant metal sheet, the temperature range of the high temperature resistant metal sheet is 800°C-1100°C, and the thickness range is 0.1mm-0.5mm; The high temperature resistant metal sheet is a high temperature alloy or a titanium-aluminum based intermetallic compound.

3. The high temperature resistant ultra-thin wall packaging shell according to claim 1 or 2, characterized in that: The depth of the housing body ranges from 10 mm to 25 mm; The radius size range of the rounded corner transition structure is R2mm-R8mm; The width of the flange ranges from 2 mm to 8 mm.

4. A method for forming a high temperature resistant ultra-thin wall packaging shell, characterized in that: The steps include: Step 1: Select the material of the high temperature resistant thin plate. The temperature range of the high temperature resistant thin plate is 800°C-1100°C, and the thickness of the high temperature resistant thin plate is selected in the range of 0.1mm-0.5mm; Step 2: Design of packaging structure: the high temperature resistant ultra-thin wall packaging shell is a box-shaped integrated structure provided with a flange, and the high temperature resistant ultra-thin wall packaging shell adopts a rounded transition structure; Step 3: forming the main body of the ultra-thin-wall shell, using a liquid filling deep drawing process to flexibly form the high-temperature resistant thin plate, and forming a curved box-shaped part after the first liquid filling deep drawing, with the maximum thinning rate controlled within 10%; Step 4: Springback compensation of the ultra-thin-wall shell body. Perform a three-dimensional scan on the ultra-thin-wall shell body formed in step 3, compare the scanned contour with the model contour to obtain compensation data, and perform springback compensation by changing the die surface. The compensation plan is formulated based on the springback calculation results as follows: Springback compensation is handled symmetrically, the compensation value of the middle part of the length direction or width direction of the ultra-thin-wall shell body is 0, the maximum compensation value of the farthest end of the front and rear flanges is 3.5mm, and the compensation ratio is 1:0.

8. According to the compensation plan, the die surface is changed accordingly, and the ultra-thin-wall shell body after springback compensation is obtained through a second deep drawing process, wherein the contour of the ultra-thin-wall shell body is within 0.5mm; Step 5: Process the welding surface. After the springback compensation in step 4, trim the ultra-thin-wall shell body, and keep the flange surface width in the range of 2mm-5mm for welding during vacuum packaging.

5. The forming method of the high temperature resistant ultra-thin wall packaging shell according to claim 4, characterized in that: In the step 1, the high temperature resistant thin plate material is a high temperature alloy or a titanium-aluminum based intermetallic compound; The high temperature resistant thin plate is cut by laser.

6. The method for forming a high temperature resistant ultra-thin wall packaging shell according to claim 4, characterized in that: In the step 2, the high temperature resistant ultra-thin wall packaging shell has a shell body, the top surface of the shell body is provided with a flange, the connection part between the flange and the shell body is a rounded transition structure, and the connection part between the shell bottom of the shell body and its surrounding edge is a rounded transition structure; The depth dimension range of the shell body is 10mm-25mm, the radius of the rounded corner transition structure is R2mm-R8mm, and the width dimension range of the flange is 2mm-8mm.

7. The forming method of the high temperature resistant ultra-thin wall packaging shell according to claim 4, characterized in that: In step three, the punching force and the blank holding force of the plate are individually controlled by a double-acting hydraulic press, and the liquid filling pressure is controlled by an ultra-high pressure water system to achieve liquid filling deep drawing flexible forming of the plate.

8. The method for forming a high temperature resistant ultra-thin wall packaging shell according to claim 7, characterized in that: In the step three, lubricating oil is applied to the sheet material to increase the flowability of the material during the liquid-filled deep drawing flexible forming process.

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