Forming method of thin-wall corrugated disc structure

Abstract

The invention discloses a forming method of a thin-wall corrugated disc structure, and relates to the technical field of metal material machining, blank parameters are obtained through target parameters of the thin-wall corrugated disc structure, forming simulation is conducted on the thin-wall corrugated disc structure, and the thin-wall corrugated disc structure is obtained on the basis of the forming simulation result. Optimizing the theoretical blank thickness: increasing a first preset wall thickness for a wave crest and wave trough area in the blank and / or reducing a second preset wall thickness for an easy-to-wrinkle area in the blank to obtain a non-uniform blank thickness; and a non-uniform-thickness blank is obtained, the non-uniform-thickness blank is welded into a conical shell blank, the conical shell blank is subjected to negative pressure forming after incremental forming, and the thin-wall corrugated disc structure is formed. Through the non-uniform wall thickness blank and the negative pressure forming method, the problems of stress concentration and / or excessive thinning and the like are avoided, the forming precision and quality are improved, and it is ensured that the surface quality is suitable for parts in complex shapes.

Description

Technical Field

[0001] This invention relates to metal material processing, specifically to a method for forming a thin-walled corrugated disk structure. Background Technology

[0002] In modern manufacturing, parts forming technology is crucial for ensuring product quality, reducing costs, and improving production efficiency. Traditional forming methods, such as stamping, casting, or injection molding, rely on specially designed molds to achieve precise replication of parts. However, these methods have significant limitations, especially when dealing with small-batch or multi-variety production of complex-shaped parts. Mold design and manufacturing are not only costly but also have long development cycles, making it difficult to respond quickly to changes in market demand. Furthermore, thin-walled parts are prone to excessive material thinning, even cracking, wrinkling, and poor surface quality during forming. Summary of the Invention

[0003] Purpose of the invention: To address the above-mentioned shortcomings, the present invention provides a forming method for thin-walled corrugated disk structures that improves processing quality.

[0004] Technical solution: To solve the above problems, the present invention employs a forming method for a thin-walled corrugated disk structure, comprising the following steps:

[0005] Step 1: Confirm the parameters of the target thin-walled corrugated disk structure;

[0006] Step 2: Based on the confirmed parameters of the thin-walled corrugated disk structure, confirm the billet parameters, including the theoretical billet shape and theoretical billet thickness;

[0007] Step 3: Perform forming simulation on the thin-walled corrugated disk structure. Based on the forming simulation results of the thin-walled corrugated disk structure, determine the peak and valley regions of the corresponding thin-walled corrugated disk structure in the billet and the wrinkle-prone areas in the billet forming process. Optimize the theoretical billet thickness: increase the first preset wall thickness in the peak and valley regions of the billet and / or decrease the second preset wall thickness in the wrinkle-prone areas of the billet to obtain a non-uniform billet thickness.

[0008] Step 4: Obtain a non-uniform thickness billet based on the obtained non-uniform billet thickness. The shape of the non-uniform thickness billet is the theoretical billet shape.

[0009] Step 5: Weld the non-uniform thickness blank into a conical shell blank, and perform progressive forming on the conical shell blank to obtain a stepped conical shell blank;

[0010] Step 6: Seal the upper and lower ends of the stepped conical shell blank to form a sealed space inside the stepped conical shell blank. Vacuum the sealed space and under negative pressure, the stepped conical shell blank undergoes plastic deformation to form a thin-walled corrugated disk structure.

[0011] Furthermore, the specific steps for obtaining the non-uniform thickness billet are as follows: obtaining an initial billet, the thickness of which is the theoretical billet thickness plus a first preset wall thickness, and the shape of the initial billet being the theoretical billet shape; rolling the initial billet through a double-roll rolling die to obtain a non-uniform thickness billet, wherein the double-roll rolling die is provided with grooves, and the grooves of the double-roll rolling die during the rolling process correspond to the peak and trough regions in the initial billet.

[0012] Furthermore, the double-roll rolling die includes an upper roll and a lower roll, both of which are conical. Grooves are provided on the surfaces of both the upper and lower rolls, and the grooves on both the upper and lower rolls correspond to the peak and trough regions in the initial billet. By adjusting the rotation speed and relative reduction of the upper and lower rolls, as well as adjusting the span of the lower roll, the initial billet is rolled to obtain a non-uniform thickness billet.

[0013] Furthermore, the specific steps for obtaining the non-uniform thickness billet are as follows: obtaining an initial billet, the thickness of which is the theoretical billet thickness, and the shape of which is the theoretical billet shape; performing electrolytic processing on the wrinkle-prone areas of the initial billet to reduce the second preset wall thickness, thereby obtaining a non-uniform thickness billet.

[0014] Furthermore, by adjusting the movement trajectory of the electrolytic brush head and the required corrosion degree of the electrolyte, the wrinkle-prone areas on the upper and lower surfaces of the initial billet are electrolytically corroded to obtain a non-uniform thickness billet with reduced wrinkle-prone areas and a second preset wall thickness.

[0015] Furthermore, the specific steps for obtaining the non-uniform thickness billet are as follows: obtaining an initial billet, the thickness of which is the theoretical billet thickness plus a first preset wall thickness, and the shape of the initial billet being the theoretical billet shape; rolling the initial billet through a double-roll rolling die to obtain an initial non-uniform thickness billet, wherein the double-roll rolling die is provided with grooves, and the grooves of the double-roll rolling die during the rolling process correspond to the peak and trough areas in the initial billet; electrolytically processing the wrinkle-prone areas of the initial non-uniform thickness billet to reduce the second preset wall thickness, thereby obtaining the final non-uniform thickness billet.

[0016] Furthermore, the specific steps for progressive forming of the conical shell blank are as follows: the conical shell blank is clamped on a stepped mold, one end of the stepped mold is connected to the positive terminal of a high-frequency power supply, a tool head electrode is mounted on the progressive forming tool head, the tool head electrode is connected to the negative terminal of the high-frequency power supply to form a circuit, the progressive forming tool head acts on the crest and trough regions of the conical shell blank, and under the action of the progressive forming tool head current and processing deformation force, the crest and trough regions of the conical shell blank are thinned, work hardened and R-angle is formed, gradually fitting into the stepped mold, and finally forming a stepped conical shell blank.

[0017] Furthermore, the upper and lower ends of the stepped conical shell blank are sealed using a negative pressure forming device, and the sealed space is evacuated. The negative pressure forming device includes an upper cover, an upper pressure block, a lower base, and a lower pressure block. Sealing rings are provided between the upper cover and the upper pressure block, and between the lower base and the lower pressure block. The upper and lower ends of the stepped conical shell blank are respectively clamped between the sealing rings and the pressure blocks. The shapes of the upper cover and upper pressure block, and the lower base and lower pressure block, can be customized according to the specific geometry of the part to be formed, to ensure sealing and stability during the forming process. An air pipe is provided inside the lower base. One end of the air pipe communicates with the interior of the stepped conical shell blank, and the other end is connected to an external air pump. The air pump is used to evacuate the interior of the stepped conical shell blank.

[0018] Furthermore, the negative pressure forming device also includes several clamping pieces and guide posts. The clamping pieces are evenly arranged around the upper top cover and the upper pressure block, and the clamping pieces of the upper top cover and the upper pressure block correspond one-to-one to form several clamping piece groups. Each group of clamping pieces is sleeved on the outside of a guide post and slides vertically up and down along the guide post.

[0019] Furthermore, the material of the thin-walled corrugated disk structure is a high-strength, low-Young's modulus metallic material, including titanium alloys and stainless steel.

[0020] First, a conical shell blank with non-uniform wall thickness is pre-prepared. The design of this blank is based on an in-depth analysis of the corrugation characteristics of the thin-walled corrugated disk structure to ensure that the material strength at each location matches the expected deformation. Through in-depth analysis of the geometric and mechanical properties of the thin-walled corrugated disk, ideal elastoplastic deformation regions are identified and extracted. For example, excessive thinning or cracking can easily occur at the crests and troughs of the corrugations, leading to part failure.

[0021] Finite element method (FEM) software was used to simulate the negative pressure forming of a thin-walled corrugated disc structure. The optimal cone shell blank shape was analyzed and deduced, and the range of differences between thickened and thinned regions was determined. Simulations predicted which regions might experience significant deformation or defects during forming, providing a basis for preform design. Based on the simulation results, the wall thickness distribution of the preform was optimized: wall thickness was increased in the peak and trough regions prone to excessive thinning to enhance material strength; and appropriate thinning was applied to areas prone to wrinkling to reduce stress concentration. Wall thickness could be increased only in areas prone to excessive thinning or decreased in areas prone to wrinkling. Further optimization could be performed, increasing wall thickness in areas prone to excessive thinning and decreasing wall thickness in areas prone to wrinkling, resulting in a non-uniform thickness blank with three thicknesses: thicker, original thickness, and thinner. By projecting the areas with larger deformations onto the preform, the final non-uniform wall thickness preform shape was obtained, ensuring forming quality. A slab slightly thicker than the target part's wall thickness was selected as the raw material. Based on the optimal billet shape determined by reverse engineering, fan-shaped billets with non-uniform wall thickness are processed using techniques such as roll forming or electrolytic machining. Specifically, the wall thickness is increased in areas prone to over-thinning, while the wall thickness is appropriately reduced in areas prone to wrinkling. The fan-shaped billets are then welded using micro-beam plasma welding technology to form a non-uniform wall thickness conical shell billet for the final progressive adaptive correction forming process.

[0022] Next, the billet undergoes electrically assisted progressive forming with a mold to create work hardening of the crests and troughs and moderately thin the material to form the corrugated radius (R-angle). Finally, the billet is clamped in a sealed device, and its interior is vacuumed. As the internal negative pressure gradually increases, the billet exhibits differentiated plastic deformation behavior in different wall thickness regions. Due to the uneven distribution of wall thickness and material strength in each region, the degree of deformation varies under the same negative pressure conditions, allowing the material to gradually undergo plastic deformation according to a pre-set strength distribution. Through this negative pressure forming method, a high-wall-thickness, uniform, thin-walled corrugated disc structure is formed.

[0023] Beneficial effects: Compared with existing technologies, the significant advantages of this invention are: by using non-uniform wall thickness blanks and negative pressure forming methods, it avoids problems such as stress concentration and / or excessive thinning, improving forming accuracy and quality, and ensuring surface quality suitable for complex-shaped parts. Utilizing negative pressure vacuum forming eliminates the need for traditional molds, reducing mold design and manufacturing costs. Forming parameters can be flexibly adjusted according to different materials and part requirements, improving production efficiency and process adaptability, making it suitable for small-batch customized production. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of the forming method of the present invention.

[0025] Figure 2 This is a schematic diagram of the high wall thickness uniform thin-walled corrugated disk structure according to an embodiment of the present invention.

[0026] Figure 3 These are the front view and top view of the high-wall-thickness uniform thin-walled corrugated disk structure according to an embodiment of the present invention.

[0027] Figure 4 This is a flowchart illustrating the process of determining the optimal billet shape according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the preform optimization design according to an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram illustrating the rolling process for preparing non-uniform wall thickness billets according to an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram illustrating the preparation of non-uniform wall thickness blanks by electrochemical milling according to an embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of a non-uniform wall thickness fan-shaped sheet blank according to an embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of a non-uniform wall thickness conical shell according to an embodiment of the present invention.

[0033] Figure 10 This is a schematic diagram of the electrically assisted progressive preforming device of the present invention.

[0034] Figure 11 This is a cross-sectional view of the electrically assisted progressive preforming device of the present invention.

[0035] Figure 12 This is a schematic diagram of the negative pressure forming device of the present invention.

[0036] Figure 13 This is a cross-sectional view of the negative pressure forming device of the present invention.

[0037] Figure 14 This is a schematic diagram of the overall structure after negative pressure forming according to the present invention.

[0038] Figure 15 This is a side view of the negative pressure forming process according to the present invention. Detailed Implementation

[0039] like Figure 1 As shown, the forming method of a thin-walled corrugated disk structure in this embodiment includes the following steps:

[0040] Step 1: Confirm the parameters of the target thin-walled corrugated disk structure;

[0041] Step 2: Based on the confirmed parameters of the thin-walled corrugated disk structure, confirm the billet parameters, including the theoretical billet shape and theoretical billet thickness;

[0042] Step 3: Perform forming simulation on the thin-walled corrugated disk structure. Based on the forming simulation results of the thin-walled corrugated disk structure, determine the peak and valley regions of the corresponding thin-walled corrugated disk structure in the billet and the wrinkle-prone areas in the billet forming process. Optimize the theoretical billet thickness: increase the first preset wall thickness in the peak and valley regions of the billet or decrease the second preset wall thickness in the wrinkle-prone areas of the billet to obtain a non-uniform billet thickness.

[0043] Step 4: Obtain a non-uniform thickness billet based on the obtained non-uniform billet thickness. The shape of the non-uniform thickness billet is the theoretical billet shape.

[0044] Step 5: Weld the non-uniform thickness blank into a conical shell blank, and perform progressive forming on the conical shell blank to obtain a stepped conical shell blank;

[0045] Step 6: Seal the upper and lower ends of the stepped conical shell blank to form a sealed space inside the stepped conical shell blank. Vacuum the sealed space and under negative pressure, the stepped conical shell blank undergoes plastic deformation to form a thin-walled corrugated disk structure.

[0046] like Figure 2 and Figure 3 As shown, the high-wall-thickness uniform thin-walled corrugated disk 1 represents the final forming effect of this embodiment. The material is a high-strength, low-Young's modulus metallic material such as titanium alloy or stainless steel. The material wall thickness is 0.1-0.3 mm.

[0047] like Figure 4 and Figure 5 Using finite element method (FEM) software, negative pressure forming simulation was performed on the corrugated structure of a high-wall-thickness uniform thin-walled corrugated disk 1. Analysis revealed that the crest and trough regions of the corrugations may experience significant deformation or defects during forming. Furthermore, the crest and trough regions of the thin-walled corrugated disk structure may experience excessive thinning and cracking during forming, necessitating thickening of the blank in these areas. An approximate shape of a stepped conical shell blank 201 was derived through analysis and deduction. Combining the calculation of sheet dimensions with finite element analysis, a fan-shaped blank 202 was obtained. After non-uniform wall thickness treatment such as roll forming and / or surface electrolytic processing, the fan-shaped blank 202 was ensured to match the material strength with the expected deformation. Finally, it was welded to obtain the conical shell blank 2. It should be noted that it is also possible to use only rollers with different surface shapes to perform secondary roll forming on the thickened blank to obtain a non-uniform thickness blank with three thicknesses: a thicker section, the original thickness, and a thinner section; or it is possible to use only surface electrolytic processing for secondary processing to obtain a non-uniform thickness blank with three thicknesses: a thicker section, the original thickness, and a thinner section.

[0048] Figure 5The preform optimization design schematic diagram projects the areas of the target part with large deformation, such as the peak features of the target part, onto the fan-shaped blank 202 (the troughs or other deformation areas of the target part can also be treated in the same way, which will not be elaborated here), and finally obtains the non-uniform wall thickness cone shell 2, ensuring that the material strength at each place matches the expected deformation, thereby effectively reducing the risk of excessive thinning in key areas.

[0049] During the forming process, based on the forming simulation results of the thin-walled corrugated disk structure, the peak and valley regions of the corresponding thin-walled corrugated disk structure in the fan-shaped blank 202 and the wrinkle-prone areas during the blank forming process are determined, and non-uniform wall thickness treatment is carried out on the peak and valley regions or wrinkle-prone areas.

[0050] like Figure 6 As shown, a double-roller rolling die can be used to process the sector-shaped blank 202. The double-roller rolling die consists of an upper roller 301 and a lower roller 302. Grooves matching the wall thickness characteristics of the non-uniform wall thickness cone shell 2 are machined onto the surfaces of the upper roller 301 and the lower roller 302. By adjusting the rotational speed, relative reduction, and lower roller span of the upper and lower rollers, a blank can be processed as shown in the diagram. Figure 8 The non-uniform wall thickness sector 203 is shown.

[0051] like Figure 7 As shown, the electrolytic brush head 304 can be used to electrolytically etch the upper and lower surfaces of the fan-shaped blank 202. By adjusting the movement trajectory of the electrolytic brush head 304 and the required corrosion degree of the electrolyte, the area that needs to be thinned can be precisely reduced so that its wall thickness reaches the required thickness.

[0052] like Figure 9 As shown, through Figure 6 and / or Figure 7 The two methods to obtain such Figure 8 After the non-uniform wall thickness fan-shaped sheet 203 is shown, it is rolled into a conical shell structure and the edges of the non-uniform wall thickness fan-shaped sheet 203 are micro-beam plasma welded to form a complete non-uniform wall thickness conical shell 2.

[0053] like Figure 10 and Figure 11As shown, a non-uniform wall thickness conical shell 2 is pre-formed into a stepped conical shell 201 using an electric-assisted incremental forming process with a mold. The electric-assisted incremental forming device consists of a tool head electrode 702, an incremental forming tool head 703, and a stepped mold 701. The non-uniform wall thickness conical shell 2 is clamped onto the stepped mold 701, with one end of the mold connected to the positive terminal of a high-frequency power supply. The incremental forming tool head 703 is equipped with the tool head electrode 702, which is connected to the negative terminal of the high-frequency power supply to form a circuit. Under the action of the tool head current and processing deformation force, the peaks and troughs of the non-uniform wall thickness conical shell 2 undergo moderate thinning, work hardening, and the formation of R-angles, gradually conforming to the stepped mold 701, ultimately forming the stepped conical shell 201. The electric-assisted incremental forming technology enables work hardening and moderate thinning at the peaks and troughs to form corrugated R-angles, which is beneficial for bending at the R-angles during negative pressure forming, reducing thinning in other areas and improving the uniformity of the wall thickness.

[0054] like Figure 12 and Figure 13 The negative pressure forming device shown comprises an upper cover 401, an upper pressure block 402, a lower base 403, and a lower pressure block 404, all connected by screws. To ensure airtightness, sealing rings are provided between the upper cover 401 and the upper pressure block 402, and between the lower base 403 and the lower pressure block 404. A stepped conical shell 201 is clamped between the sealing rings and the pressure blocks, ensuring sealing and stability during the forming process. The shapes of the upper cover and upper pressure block, and the lower base and lower pressure block, can be customized according to the specific geometry of the part to be formed, ensuring sealing and stability during the forming process. An air pipe 6 is provided inside the lower base 403, one end of which communicates with the interior of the conical shell 201, and the other end is connected to an external air pump. Through the cooperation of the air pump and the air pipe 6, negative pressure can be generated inside the conical shell, achieving a vacuum effect. The vacuum rate can be adjusted according to the strength of different metal materials to improve the wall thickness uniformity of the formed thin-walled corrugated disc structure. To prevent the billet from shifting during deformation under negative pressure, the negative pressure forming device is equipped with guide posts 5 and multiple sets of clamping plates 501 evenly arranged circumferentially on the upper top cover and upper pressure block. Each set of clamping plates 501 is fixed on the guide post 5 and can slide vertically up and down along the guide post 5.

[0055] like Figure 14 and Figure 15 As shown, when the stepped conical shell 201 deforms, these clips 501 guide the upper top cover 401 and the upper pressure block 402 to move smoothly downward along the guide post 5, providing precise guidance and ensuring the stability of the forming process, ultimately forming a high-wall-thickness uniform thin-walled corrugated disk structure.

Claims

1. A method of forming a thin-walled corrugated disc structure, characterized by, The method comprises the following steps: Step 1: confirming parameters of the thin-walled corrugated disc structure of the target; Step 2: confirming blank parameters, including a theoretical blank shape and a theoretical blank thickness, based on the confirmed parameters of the thin-walled corrugated disc structure; Step 3: performing forming simulation on the thin-walled corrugated disc structure, determining, based on a forming simulation result of the thin-walled corrugated disc structure, a wave crest and trough region in the blank corresponding to the thin-walled corrugated disc structure and a wrinkle-prone region in a blank forming process, and optimizing the theoretical blank thickness: increasing a first preset wall thickness in the wave crest and trough region in the blank and / or reducing a second preset wall thickness in the wrinkle-prone region in the blank to obtain a non-uniform blank thickness; Step 4: obtaining a non-uniform thickness blank based on the obtained non-uniform blank thickness, the non-uniform thickness blank having the theoretical blank shape; Step 5: welding the non-uniform thickness blank into a conical shell blank, and performing incremental forming on the conical shell blank to obtain a stepped conical shell blank; Step 6: sealing the upper and lower ends of the stepped conical shell blank, forming a sealed space in the stepped conical shell blank, and performing vacuumization on the sealed space, so that the stepped conical shell blank plastically deforms under the action of negative pressure to form the thin-walled corrugated disc structure.

2. The forming method of a thin-walled corrugated disc structure according to claim 1, characterized by, The specific steps for obtaining the non-uniform thickness blank are: obtaining an initial blank, the thickness of the initial blank being the theoretical blank thickness increased by the first preset wall thickness, and the shape of the initial blank being the theoretical blank shape; and rolling the initial blank through a double-roller roll forming die to obtain the non-uniform thickness blank, the double-roller roll forming die being provided with a groove, and the groove of the double-roller roll forming die corresponding to the wave crest and trough region in the initial blank during rolling.

3. The method of forming a thin-walled corrugated disc structure according to claim 2, wherein The double-roller roll forming die comprises an upper roller (301) and a lower roller (302), the upper roller (301) and the lower roller (302) are conical, the upper roller (301) and the lower roller (302) are each provided with a groove, and the grooves of the upper roller (301) and the lower roller (302) each correspond to the wave crest and trough region in the initial blank, the initial blank is rolled by adjusting the rotating speed, relative reduction of the upper roller (301) and the lower roller (302), and the span of the lower roller to obtain the non-uniform thickness blank.

4. The method of forming a thin-walled corrugated disc structure according to claim 1, wherein The specific steps for obtaining the non-uniform thickness blank are: obtaining an initial blank, the thickness of the initial blank being the theoretical blank thickness, and the shape of the initial blank being the theoretical blank shape; and performing electrolytic processing on the wrinkle-prone region of the initial blank to reduce the second preset wall thickness to obtain the non-uniform thickness blank.

5. The method of forming a thin-walled corrugated disc structure according to claim 4, wherein The wrinkle-prone region on the upper and lower surfaces of the initial blank is electrolytically corroded by adjusting the motion track of an electrolytic brush head (304) and the corrosion degree of the required electrolyte to obtain the non-uniform thickness blank with the wrinkle-prone region reduced by the second preset wall thickness.

6. The method of forming a thin-walled, corrugated disc structure of claim 1, wherein, The specific steps of obtaining the non-uniform thickness blank are: obtaining an initial blank, the thickness of the initial blank being the theoretical blank thickness increased by a first preset wall thickness, and the shape of the initial blank being the theoretical blank shape; rolling the initial blank through a double-roller coiling die to obtain an initial non-uniform thickness blank, the double-roller coiling die being provided with a groove, and the groove of the double-roller coiling die corresponding to the wave peak and valley regions in the initial blank during the rolling process; electrolytically processing the easy-wrinkling regions of the initial non-uniform thickness blank to reduce a second preset wall thickness to obtain a final non-uniform thickness blank.

7. The method of forming a thin-walled, corrugated disc structure of claim 1, wherein, The specific steps of the progressive forming of the conical shell blank are: clamping the conical shell blank (2) on a stepped die (701), connecting one end of the stepped die (701) with a positive pole of a high-frequency power supply, mounting a tool head electrode (702) on a progressive forming tool head (703), connecting the tool head electrode (702) with a negative pole of the high-frequency power supply to form a loop, and making the progressive forming tool head (703) act on the wave peak and valley regions of the conical shell blank, so that the wave peak and valley regions of the conical shell blank are thinned, work-hardened and formed with R angles under the action of the current and the processing deformation force of the progressive forming tool head (703), and gradually fit the stepped die (701), and finally form a stepped conical shell blank (201).

8. The method of forming a thin-walled, corrugated disc structure of claim 1, wherein, The upper and lower ends of the stepped conical shell blank are sealed by a negative pressure forming device, and the sealed space is vacuumized, the negative pressure forming device comprising an upper cover (401), an upper pressing block (402), a lower base (403) and a lower pressing block (404), sealing rings being arranged between the upper cover (401) and the upper pressing block (402) and between the lower base (403) and the lower pressing block (404), the upper and lower ends of the stepped conical shell blank (201) being clamped between the sealing rings and the pressing blocks, a gas pipe (6) being arranged in the lower base (403), one end of the gas pipe (6) being in communication with the inside of the stepped conical shell blank (201), and the other end being connected with an external air pump, the air pump being used for vacuumizing the inside of the stepped conical shell blank (201).

9. The method of forming a thin-walled corrugated disc structure according to claim 8, wherein The negative pressure forming device further comprises a plurality of clamping pieces (501) and guide columns (5), the clamping pieces being uniformly arranged in the circumferences of the upper cover (401) and the upper pressing block (402), and the clamping pieces of the upper cover (401) and the upper pressing block (402) one-to-one corresponding to form a plurality of clamping piece groups, each group of clamping pieces being sleeved outside one guide column (5) and sliding vertically up and down along the guide column (5).

10. The method of forming a thin-walled, corrugated disc structure of claim 1, wherein, The material of the thin-walled corrugated disc structure is a high-strength and low-Young's modulus metal material, including titanium alloy and stainless steel.

Images