Processing method of composite material storage box end socket

Abstract

The invention belongs to the technical field of composite material storage box manufacturing, and particularly relates to a composite material storage box sealing head machining method which comprises the steps that S1, a first material sheet set, a second material sheet set and a mold are obtained; s2, the first material sheet set is laid on the mold and is pre-compacted; s3, laying the second material sheet group on the mold, and performing pre-compaction on the second material sheet group; and step S4, repeatedly and alternately executing the step S2 and the step S3 until the step S3 is executed for 2-5 times. The pressure-bearing and sealing performance of the seal head part is guaranteed, meanwhile, the workpiece production difficulty is lowered, the production cost is reduced, the manufacturing period is shortened, and therefore the production efficiency of the composite storage tank seal head part is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material tank manufacturing, and in particular relates to a method for processing a composite material tank head. Background Art

[0002] The weight of a rocket is a key factor affecting its carrying capacity and flight efficiency. The cryogenic propellant tank is the largest component in terms of weight and volume in the propulsion system, accounting for about 60% of the total weight of the structure. Reducing the weight of the tank is crucial to improving rocket performance. Cryogenic propellant tanks of space launch vehicles at home and abroad generally use metal materials, and it is currently difficult to meet the weight reduction needs of the tanks. Carbon fiber reinforced resin-based composite materials have excellent properties such as high specific strength and specific modulus, which can significantly reduce the weight of the tank. Related studies have shown that the use of composite materials instead of metal materials to manufacture large aerospace propellant tanks can reduce weight by 20% to 40%, which is an inevitable trend in the future development of spacecraft.

[0003] Traditional composite tank manufacturing usually adopts an integrated molding process, that is, through a split mold, a large-scale wire laying machine is used to lay out the tank as a whole, and after curing, the split mold is removed through the flange holes on both sides of the tank. However, the equipment and mold costs of this process are high, and the manufacturing cycle is long. The use of separate manual laying of the head and the straight barrel section, and then gluing the two together can significantly reduce the manufacturing cost and difficulty, and shorten the manufacturing cycle. Since the fuel contained in the liquid rocket tank is ultra-low temperature medium such as liquid oxygen, liquid hydrogen, and liquid methane at 0.2 to 0.6 MPa, one of the key issues that need to be solved is how to design the laying method of the head so that it can meet the pressure-bearing and sealing performance in ultra-low temperature environments. Summary of the invention

[0004] According to the technical problem raised above, a processing method of a composite tank head is provided. The present invention improves the laying method of the pre-laid material of the head so that it can meet the pressure bearing and sealing performance in an ultra-low temperature environment while reducing the production cost and manufacturing cycle, thereby effectively improving the production efficiency of the composite tank head component.

[0005] In order to solve the above technical problems, the present invention provides a processing method for a composite material tank head, comprising: S1, obtaining a first sheet group, a second sheet group and a mold; S2, laying the first sheet group on the mold and pre-compacting it; S3, laying the second sheet group on the mold and pre-compacting it; S4, repeating and alternating the steps S2 and S3 until the step S3 is executed 2-5 times; S5, curing to obtain the tank head.

[0006] Furthermore, the first sheet group includes: a first sheet layer, the first sheet layer is formed by paving a plurality of first pre-laid materials, and adjacent first pre-laid materials are partially overlapped.

[0007] Further, the second sheet group includes: a second sheet layer, which is formed by alternately laying waste sheets and second pre-laid sheets.

[0008] Further, the inner ring side of the first pre-laid sheet with a larger inner diameter is overlapped and arranged on the outer ring side of the adjacent first pre-laid sheet with a smaller inner diameter.

[0009] Further, the first pre-laid sheet includes: odd-sequence sheets and even-sequence sheets; the outer ring edge of any odd-sequence sheet is aligned with the inner ring edge of the adjacent even-sequence sheet with a larger inner diameter, and the inner ring edge of any odd-sequence sheet is aligned with the outer ring edge of the adjacent even-sequence sheet with a smaller inner diameter.

[0010] Further, the first sheet group is formed by alternately laying the first sheet layer and waste sheets.

[0011] Further, the first pre-laid sheet is formed by circumferentially laying strip-shaped pre-laid sheets along the central axis of the mold, and the first pre-laid sheet includes: seams; the seams of adjacent first pre-laid sheets are arranged at intervals, and the adjacent seams are spaced 300±10 mm apart.

[0012] Further, the inner diameter of the first sheet layer with a larger outer diameter is smaller than the outer diameter of the first sheet layer with a smaller outer diameter. The inner diameter of the first sheet layer is between 350 - 3000 mm, and the outer diameter of the first sheet layer is between 700 - 3160 mm.

[0013] Further, the second sheet layer includes: a first T-shaped sheet and a second T-shaped sheet; the first T-shaped sheet and the second T-shaped sheet are circumferentially laid along the central axis of the mold to form the second sheet layer.

[0014] Further, step S1 further includes: pre-treating the mold, laying a pre-laid layer on the mold and pre-compacting it. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 It is a schematic flow chart of the first embodiment of the present invention;

[0017] Figure 2Schematic flowchart of the second embodiment of the present invention;

[0018] Figure 3 Schematic structural diagram of the first layer of the pre-laying layer in the second embodiment of the present invention;

[0019] Figure 4 Schematic structural diagram of the second layer of the pre-laying layer in the second embodiment of the present invention;

[0020] Figure 5 Schematic structural diagram of the second pre-laying material in the second embodiment of the present invention;

[0021] Figure 6 Schematic structural diagram of the third layer of the pre-laying layer in the second embodiment of the present invention;

[0022] Figure 7 Schematic structural diagram of the first pre-laying material in the second embodiment of the present invention;

[0023] Figure 8 is Figure 7 Schematic cross-sectional structure diagram;

[0024] Figure 9 Schematic exploded structure diagram of the odd-sequence material sheets of the present invention;

[0025] Figure 10 Schematic exploded structure diagram of the even-sequence material sheets of the present invention;

[0026] Figure 11 Schematic structural diagram of the storage tank head of the present invention.

[0027] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0028] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 , Figure 1 Schematic flowchart of the first embodiment of the present invention.

[0030] S10: Obtain the first material sheet group, the second material sheet group and the mold.

[0031] In this embodiment, the first material sheet group and the second material sheet group are cut and combined from carbon fiber orthogonal woven fabric prepreg.

[0032] In other embodiments, the first sheet group and the second sheet group can also be formed by cutting and combining carbon fiber twill woven fabric prepregs.

[0033] In this embodiment, the mold forming side is approximately hemispherical, and the mold includes a core mold and an upper head mold.

[0034] In other embodiments, the mold can be a head mold of other sizes and shapes.

[0035] S11: Lay the first sheet group on the mold and pre-compact it.

[0036] S12: Lay the second sheet group on the mold and pre-compact it.

[0037] S13: Repeat and alternately execute step S21 and the said step S22 until step S22 has been executed 2 - 5 times.

[0038] S14: Cure to obtain the tank head.

[0039] In this embodiment, lay the first sheet group on the mold, and then lay the second sheet group after the first sheet group is laid and pre-compacted. After the second sheet group is laid and pre-compacted, lay the first sheet group again, and so on in a cycle until the second sheet group has been laid 2 - 5 times.

[0040] In a preferred embodiment, the second sheet group is laid 3 times.

[0041] Please refer to Figure 2 , Figure 2 which is the process schematic diagram of the second embodiment of the present invention.

[0042] S20: Obtain the first sheet group, the second sheet group and the mold, pre-treat the mold, lay a pre-preg layer on the mold and pre-compact it.

[0043] In this embodiment, perform pre-treatment work such as cleaning and applying a release agent to the mold 21.

[0044] Please further refer to Figure 3 , Figure 3 which is the structural schematic diagram of the first layer of the pre-preg layer in the second embodiment of the present invention.

[0045] In this embodiment, lay multiple layers of annular lost-layer sheets on the mold 21 to form the first layer of the pre-preg layer.

[0046] Specifically, lay 3 layers of annular lost-layer sheets around the flange hole 22 in ascending order of outer diameter. Their inner diameters are all 395 mm, and the outer diameters are 490 mm, 492.76 mm, and 495.52 mm respectively.

[0047] In other embodiments, the layer-discarding sheets can be laid in 2 - 12 layers, and the inner diameter and outer diameter can adopt different sizes of layer-discarding sheets according to the sizes of different molds.

[0048] Please further refer to Figure 4 , Figure 4 which is a schematic structural view of the second layer of the pre-laying layer in the second embodiment of the present invention.

[0049] In this embodiment, after the layer-discarding sheets are laid, a second pre-laying material 23 is laid on the mold 21. The second pre-laying material 23 is a T-shaped sheet. The T-shaped end of the second pre-laying material 23 is circumferentially laid along the central axis of the flange hole 22, and the size of the second pre-laying material 23 can satisfy completely covering the molding surface of the mold 21.

[0050] In other embodiments, the second pre-laying material 23 can also adopt other structures that can cover the molding surface of the mold 21.

[0051] Please further refer to Figure 5 , Figure 5 which is a schematic structural view of the second pre-laying material in the second embodiment of the present invention.

[0052] In this embodiment, the second pre-laying material 23 includes: a first T-shaped pre-laying material 231 and a second T-shaped pre-laying material 232; the second pre-laying material 23 is composed of two first T-shaped pre-laying materials 231 and one second T-shaped pre-laying material 232, and the laying method is as Figure 4 shown, forming the second layer of the pre-laying layer.

[0053] Specifically, the length of the first T-shaped pre-laying material 231 is 1820 mm, the width is 813 mm, the width of each T-shaped end is 52 mm, the length of the second T-shaped pre-laying material 232 is 728 mm, the width is 813 mm, and the width of each T-shaped end is 52 mm.

[0054] Please further refer to Figure 6 , Figure 6 which is a schematic structural view of the third layer of the pre-laying layer in the second embodiment of the present invention.

[0055] In this embodiment, after the second pre-laying material 23 is laid, 5 layers of annular layer-discarding sheets are laid along the periphery of the flange hole 22.

[0056] Specifically, the 5 layers of annular layer-discarding sheets are sequentially laid around the flange hole 22 in ascending order of the outer diameter. Their inner diameters are all 395 mm, and the outer diameters are 498.28 mm, 501.04 mm, 503.8 mm, 506.56 mm, and 509.32 mm respectively.

[0057] In other embodiments, the layer-discarding sheets can be laid in 2 - 12 layers, and the inner diameter and outer diameter can adopt different sizes of layer-discarding sheets according to the sizes of different molds.

[0058] In this embodiment, after laying the pre-laying layer, it is evacuated to -0.1 MPa for pre-compaction.

[0059] S21: Lay the first sheet group on the mold and pre-compact it.

[0060] In this embodiment, the first sheet group includes: a first sheet layer, which is formed by laying a plurality of first pre-laying sheets, and adjacent first pre-laying sheets partially overlap.

[0061] Please refer to Figure 7 and Figure 8 , Figure 7 which is a schematic structural view of the first pre-laying sheet in the second embodiment of the present invention, Figure 8 and Figure 7 is a schematic cross-sectional structural view of

[0062] In this embodiment, the first pre-laying sheet includes: odd-sequence sheets 24 and even-sequence sheets 25; the outer ring edge of any odd-sequence sheet 24 is aligned with the inner ring edge of the adjacent even-sequence sheet 25 with a larger inner diameter, and the inner ring edge of any odd-sequence sheet 24 is aligned with the outer ring edge of the adjacent even-sequence sheet 25 with a smaller inner diameter.

[0063] Please further refer to Figure 9 and Figure 10 , Figure 9 which is an exploded structural view of the odd-sequence sheet of the present invention, Figure 10 and

[0064] which is an exploded structural view of the even-sequence sheet of the present invention.

[0065] In this embodiment, the odd-sequence sheet 24 is composed of a first sheet 241, a third sheet 242, a fifth sheet 243, a seventh sheet 244, a ninth sheet 245, and an eleventh sheet 246.

[0066] In this embodiment, the even-sequence sheet 25 is composed of a second sheet 251, a fourth sheet 252, a sixth sheet 253, an eighth sheet 254, a tenth sheet 255, and a twelfth sheet 256.

[0067] Specifically, the inner diameter of the first sheet 241 is 395 mm, and the outer diameter is 722 mm; the inner diameter of the second sheet 251 is 395 mm, and the outer diameter is 817 mm.

[0068] In this embodiment, the inner diameter of the third sheet 242 is circumferentially laid along the outer diameter edge of the first sheet 241 and partially overlaps above the second sheet 251, and the overlapping dimension is 48 mm; the inner diameter of the fourth sheet 252 is circumferentially laid along the outer diameter edge of the second sheet 251 and partially overlaps above the third sheet 242, and the overlapping dimension is 84 mm.

[0069] Specifically, the inner diameter of the third sheet 242 is 762 mm and the outer diameter is 1024 mm; the inner diameter of the fourth sheet 252 is 884 mm and the outer diameter is 1162 mm.

[0070] In this embodiment, the inner diameter of the fifth sheet 243 is circumferentially laid along the outer diameter edge of the third sheet 242 and partially overlaps above the fourth sheet 252, and the overlapping dimension is 56 mm; the inner diameter of the sixth sheet 253 is circumferentially laid along the outer diameter edge of the fourth sheet 252 and partially overlaps above the fifth sheet 243, and the overlapping dimension is 50 mm.

[0071] Specifically, the inner diameter of the fifth sheet 243 is 1108 mm and the outer diameter is 1320 mm; the inner diameter of the sixth sheet 253 is 1366 mm and the outer diameter is 1600 mm.

[0072] In this embodiment, the inner diameter of the seventh sheet 244 is circumferentially laid along the outer diameter edge of the fifth sheet 243 and partially overlaps above the sixth sheet 253, and the overlapping dimension is 67 mm; the inner diameter of the eighth sheet 254 is circumferentially laid along the outer diameter edge of the sixth sheet 253 and partially overlaps above the seventh sheet 244, and the overlapping dimension is 59 mm.

[0073] Specifically, the inner diameter of the seventh sheet 244 is 1670 mm and the outer diameter is 1922 mm; the inner diameter of the eighth sheet 254 is 2296 mm and the outer diameter is 2554 mm.

[0074] In this embodiment, the inner diameter of the ninth sheet 245 is circumferentially laid along the outer diameter edge of the seventh sheet 244 and partially overlaps above the eighth sheet 254, and the overlapping dimension is 70 mm; the inner diameter of the tenth sheet 255 is circumferentially laid along the outer diameter edge of the eighth sheet 254 and partially overlaps above the ninth sheet 245, and the overlapping dimension is 13 mm.

[0075] Specifically, the inner diameter of the ninth sheet 245 is 2990 mm and the outer diameter is 3160 mm.

[0076] In this embodiment, the inner diameter of the eleventh sheet 246 is laid circumferentially along the outer diameter edge of the ninth sheet 245 and partially overlaps above the tenth sheet 255, and the overlapping dimension is 12 mm; the twelfth sheet 256 is laid circumferentially along the outer diameter edge of the tenth sheet 255 and partially overlaps above the ninth sheet 245, and the overlapping dimension is 12 mm. It should be particularly noted that in this embodiment, the laying directions of the eleventh sheet 246 and the twelfth sheet 256 are parallel to the central axis of the flange hole 22, that is, the eleventh sheet 246 and the twelfth sheet 256 are perpendicular to the plane where the flange hole 22 is located.

[0077] Specifically, the eleventh sheet 246 is 4361 mm long and 201 mm wide; the twelfth sheet 256 is 4361 mm long and 192 mm wide.

[0078] In this embodiment, after the odd-sequence sheets 24 and the even-sequence sheets 25 are laid, the first sheet layer is obtained.

[0079] In this embodiment, the first pre-laid material is a strip-shaped pre-laid material laid circumferentially around the central axis of the mold 21 along the surface of the mold 21. Therefore, each first pre-laid material includes: a seam; the seams of adjacent two first pre-laid materials are arranged at equal intervals.

[0080] Specifically, the seams of adjacent two first pre-laid materials are 300 mm apart.

[0081] In this embodiment, the first sheet group is formed by alternately laying the first sheet layer and the discarded sheets; the laying method of the first sheet group is: first lay the first sheet layer, and then lay 6 - 12 layers of discarded sheets.

[0082] Specifically, after the first pre-laid material is laid, 9 layers of discarded sheets are laid in sequence along the flange hole 22 from small to large in outer diameter to obtain the first sheet group, and then it is evacuated to -0.1 MPa for pre-compaction; the inner diameters of the discarded sheets are all 395 mm, and the outer diameters are 512.08 mm, 514.84 mm, 517.6 mm, 520.36 mm, 523.12 mm, 525.88 mm, 528.64 mm, 531.4 mm, 534.16 mm respectively.

[0083] S22: Lay the second sheet group on the mold and pre-compact it.

[0084] In this embodiment, the second sheet group includes: a second sheet layer; the second sheet layer is formed by alternately laying the discarded sheets and the second pre-laid material 23.

[0085] In this embodiment, after the first set of sheet materials is laid and pre-compacted, the second pre-laid material 23 is laid in the same manner as the pre-laid layer in step S21. Then, 8 layers of dropped sheet materials are laid on the second pre-laid material 23 in ascending order of outer diameter to form a second sheet material layer. The inner diameters of the dropped sheet materials are all 395 mm, and the outer diameters are 536.92 mm, 539.68 mm, 542.44 mm, 545.2 mm, 547.96 mm, 550.72 mm, 553.48 mm, and 556.24 mm respectively.

[0086] In other embodiments, the number of layers of the dropped sheet materials can be set to 2 - 12 layers.

[0087] In this embodiment, the second set of sheet materials is composed of two second sheet material layers. Therefore, there are a total of two sets of dropped sheet material layers, that is, they are divided into a first set of dropped sheet materials and a second set of dropped sheet materials according to the laying order.

[0088] In this embodiment, after laying two second sheet material layers to form the second set of sheet materials, vacuum is pumped to -0.1 MPa for pre-compaction.

[0089] In other embodiments, the second set of sheet materials can be composed of multiple second sheet material layers.

[0090] S23: Repeat and alternately execute step S21 and step S22 until step S22 is executed 2 - 5 times.

[0091] In this embodiment, steps S21 and S22 are repeatedly executed until step S22 is executed 3 times.

[0092] In this embodiment, the first set of sheet materials and the second set of sheet materials are alternately laid 7 times. Among them, the number of layers of the dropped sheet materials laid each time when laying the first set of sheet materials and the second set of sheet materials can be different, specifically 2 - 12 layers, and the number of layers of the dropped sheet materials each time when laying the second sheet material layer can also be different, specifically 2 - 12 layers.

[0093] Specifically, when step S22 was first executed, 9 layers of discarded layer pieces were laid, all with an inner diameter of 395 mm and outer diameters of 512.08 mm, 514.84 mm, 517.6 mm, 520.36 mm, 523.12 mm, 525.88 mm, 528.64 mm, 531.4 mm, and 534.16 mm respectively; when step S23 was first executed, 8 layers of the first group of discarded layer pieces were laid, with dimensions: inner diameter of 395 mm each and outer diameters of 536.92 mm, 539.68 mm, 542.44 mm, 545.2 mm, 547.96 mm, 550.72 mm, 553.48 mm, and 556.24 mm respectively, and 9 layers of the second group of discarded layer pieces were laid, with dimensions: inner diameter of 395 mm each and outer diameters of 559 mm, 561.76 mm, 564.52 mm, 567.28 mm, 570.04 mm, 572.8 mm, 575.56 mm, 578.32 mm, and 581.08 mm respectively.

[0094] Specifically, when step S22 was executed for the second time, 8 layers of discarded layer pieces were laid, all with an inner diameter of 395 mm and outer diameters of 583.84 mm, 586.6 mm, 589.36 mm, 592.12 mm, 594.88 mm, 597.64 mm, 600.4 mm, and 603.16 mm respectively; when step S23 was executed for the second time, 9 layers of the first group of discarded layer pieces were laid, with inner diameters of 395 mm each and outer diameters of 605.92 mm, 608.68 mm, 611.44 mm, 614.2 mm, 616.96 mm, 619.72 mm, 622.48 mm, 625.24 mm, and 628 mm respectively, and 8 layers of the second group of discarded layer pieces were laid, with inner diameters of 395 mm each and outer diameters of 630.76 mm, 633.52 mm, 636.28 mm, 639.04 mm, 641.8 mm, 644.56 mm, 647.32 mm, and 650.08 mm respectively.

[0095] Specifically, when the step S22 was executed for the third time, 9 layers of discarded layer pieces were laid, and their inner diameters were all 395 mm, and the outer diameters were 652.84 mm, 655.6 mm, 658.36 mm, 661.12 mm, 663.88 mm, 666.64 mm, 669.4 mm, 672.16 mm, and 674.92 mm respectively; when the step S23 was executed for the third time, 8 layers of discarded layer pieces were laid in the first group, and their inner diameters were all 395 mm, and the outer diameters were 677.68 mm, 680.44 mm, 683.2 mm, 685.96 mm, 688.72 mm, 691.48 mm, 694.24 mm, and 697 mm respectively. 9 layers of discarded layer pieces were laid in the second group, and their inner diameters were all 395 mm, and the outer diameters were 699.76 mm, 702.52 mm, 705.28 mm, 708.04 mm, 710.8 mm, 713.56 mm, 716.32 mm, 719.08 mm, and 721.84 mm respectively.

[0096] S24. Curing to obtain the storage tank head.

[0097] Please refer to Figure 11 , Figure 11 which is the structural schematic diagram of the storage tank head of the present invention.

[0098] In this embodiment, after the laying is completed, the vacuum bag is wrapped and cured in a hot press to obtain the storage tank head 30.

[0099] The present invention improves the laying method of the head prepreg, so that while meeting the pressure-bearing and sealing performance in the ultra-low temperature environment, the production cost and manufacturing cycle are reduced, thereby effectively improving the production efficiency of the composite material storage tank head component.

[0100] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for processing a composite material tank head, characterized in that: include: S1, obtaining a first sheet group, a second sheet group and a mold; S2, laying the first sheet group on the mold and pre-compacting it; S3, laying the second sheet group on the mold and pre-compacting it; S4, repeating and alternating step S2 and step S3 until step S3 is executed 2-5 times; S5. Solidify to obtain the tank head.

2. The method for processing a composite material tank head according to claim 1, characterized in that: The first material sheet group includes: a first material sheet layer, wherein the first material sheet layer is formed by laying out a plurality of first pre-laid materials, and adjacent first pre-laid materials are partially overlapped.

3. The method for processing a composite material tank head according to claim 1, characterized in that: The second material sheet group includes: a second material sheet layer, and the second material sheet layer is formed by alternately laying lost-layer materials and second pre-laid materials.

4. The method for processing a composite material tank head according to claim 2, characterized in that: The inner ring side of the first pre-laid material with a larger inner diameter is overlapped and arranged on the outer ring side of the adjacent first pre-laid material with a smaller inner diameter.

5. The method for processing a composite material tank head according to claim 2, characterized in that: The first pre-laid material includes: odd-numbered sequence sheets and even-numbered sequence sheets; the outer ring edge of any of the odd-numbered sequence sheets is aligned with the inner ring edge of the adjacent even-numbered sequence sheet with a larger inner diameter, and the inner ring edge of any of the odd-numbered sequence sheets is aligned with the outer ring edge of the adjacent even-numbered sequence sheet with a smaller inner diameter.

6. The method for processing a composite material tank head according to claim 2, characterized in that: The first sheet group is formed by alternately laying the first sheet layers and lost-layer sheets.

7. The method for processing a composite material tank head according to claim 2, characterized in that: The first pre-laid material is formed by laying long strips of pre-laid material circumferentially along the central axis of the mold, and the first pre-laid material includes: a seam; the seams of adjacent first pre-laid materials are arranged at intervals, and the interval between adjacent seams is 300±10mm.

8. The method for processing a composite material tank head according to claim 2, characterized in that: The inner diameter of the adjacent first sheet layer with a larger outer diameter is smaller than the outer diameter of the first sheet layer with a smaller outer diameter. The inner diameter of the first sheet layer is between 350-3000 mm, and the outer diameter of the first sheet layer is between 700-3160 mm.

9. The method for processing a composite material tank head according to claim 3, characterized in that: The second sheet layer includes: a first T-shaped sheet and a second T-shaped sheet; the first T-shaped sheet and the second T-shaped sheet are laid circumferentially along the central axis of the mold to form the second sheet layer.

10. The method for processing a composite material tank head according to claim 1, characterized in that: The step S1 further comprises: pre-treating the mold, laying a pre-layer on the mold and pre-compacting it.

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