Forming method of variable cross-section I-shaped beam structure and auxiliary device

Abstract

The invention discloses an efficient and low-cost manufacturing method of a composite variable-cross-section I-shaped beam, belongs to the technical field of composite beam preparation, and particularly relates to a forming method of a variable-cross-section I-shaped beam structure and an auxiliary device. According to the invention, the combined mold of the rubber soft mold and the supporting mold is subjected to rotary continuous fiber placement to form a plurality of box-shaped preforming bodies, and the plurality of box-shaped preforming bodies form the multi-cavity preforming combined body, so that the rubber soft mold and the supporting mold are combined to replace a complex forming mold; the manufacturing quality problem of the flange-web plate of the composite variable-cross-section I-shaped beam is solved, the tool investment is reduced, the laying efficiency is improved and the material utilization rate is increased through rotary continuous fiber laying, combined integral laying and forming, the method is suitable for batch and specialized production, the production efficiency can be obviously improved, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] The invention discloses an efficient and low-cost method for manufacturing a composite material variable-section I-shaped beam, belongs to the technical field of composite material beam preparation, and specifically relates to a forming method and auxiliary device for a variable-section I-shaped beam structure. Background Art

[0002] Composite beams have various cross-sectional forms (such as I-shaped, box-shaped, circular, T-shaped, etc.), and I-shaped sections (I-beams) have unique advantages in composite structures, especially in terms of lightweight and mechanical properties. I-beams, with their extreme material efficiency, are particularly suitable for scenarios dominated by bending loads. Composite I-beams are significantly superior to other cross-sections in terms of bending efficiency and lightweight, and are the king of bending efficiency in composite structures. At the same weight, the bending stiffness can reach 3-5 times that of metal beams, which is 40-50% lighter than aluminum alloy beams and 60-70% lighter than steel beams. However, the manufacturing difficulty of composite I-beams is mainly reflected in the fact that resin enrichment is prone to occur in the flange-web transition zone and corners, resulting in uneven thickness and fiber wrinkles. Variable-section I-beams, in particular, require modular combination molds, which are difficult to manufacture and increase costs by 30-50%. Summary of the Invention

[0003] Purpose of the invention: To provide a forming method and auxiliary device for a variable-section I-beam structure to solve the above-mentioned problems.

[0004] Technical solution: A forming method for a variable-section I-beam structure, comprising the following steps:

[0005] Step 1: manufacturing a rubber soft mold and a support mold;

[0006] Step 2: forming a box-shaped preform by rotating and continuously placing the combined mold of the rubber soft mold and the support mold;

[0007] Step 3, repeating steps 1 and 2 as needed to manufacture a plurality of combined molds made of the rubber soft mold and the support mold, and rotating and continuously laying wires to form a plurality of box-shaped preforms;

[0008] Step 4: aligning and assembling the plurality of combined molds made of the rubber soft mold and the support mold and the box-shaped preforms in step 3;

[0009] Step 5: cutting a box-shaped preform into two symmetrical C-shaped preforms, combining the cut C-shaped preforms with the rubber soft mold and the support mold, and then splicing them side by side on both sides of the box-shaped preform assembly, positioning and compacting them to form a multi-cavity preform assembly;

[0010] Step 6: Laying twist strips between the upper and lower surfaces of the multi-cavity preform assembly and the adjacent box-shaped preforms;

[0011] Step 7: Lay the lower wall panel on the lower wall panel mold;

[0012] Step 8: Position and assemble the box-shaped preform assembly on which the twist strips are laid in step 6 and the mold for laying the lower wall panel in step 7.

[0013] Step 9: Lay the upper wall panel on the upper surface of the box-shaped preformed assembly;

[0014] Step 10: Encapsulation and curing;

[0015] Step 11: Demolding, cutting, and testing are performed; the multi-beam assembly is cut into multiple I-beams with variable cross-sections. This reduces machining work by half and reduces margin loss.

[0016] In a further embodiment, the rubber soft mold and the support mold are combined to serve as a rotating continuous wire laying mold for composite material variable-section I-beams.

[0017] In a further embodiment, in step 10, the packaging is achieved by using putty strips to seal the vacuum bag to the lower wall panel mold and the outer surface of the rubber soft mold and then performing vacuuming.

[0018] An auxiliary device for a variable-section I-beam structure, used to implement the above-mentioned forming method, said auxiliary device comprising: a combined die;

[0019] The combined mold is formed by combining a rubber soft mold and a support mold;

[0020] The supporting mold is installed in the rubber soft mold, and the outer surface of the supporting mold matches the inner shape of the rubber soft mold.

[0021] In a further embodiment, the rubber soft mold is provided with a fiber reinforcement layer.

[0022] In a further embodiment, the combination mold is provided in a plurality of groups, and each combination mold forms a plurality of box-shaped preforms by rotating and continuously placing the wire through the wire placing machine and the wire placing prepreg material;

[0023] One of the box-shaped preforms is cut into two symmetrical C-shaped preforms, and the remaining box-shaped preforms are positioned side by side and combined in the two symmetrical C-shaped preforms to form a multi-cavity preform assembly.

[0024] In a further embodiment, in the multi-cavity preform assembly, twist strips are laid between adjacent box-shaped preforms.

[0025] In a further embodiment, the multi-cavity preformed assembly is mounted on a lower wall panel mold, a lower wall panel is placed on the lower wall panel mold, and support mold positioning seats are provided at both ends of the lower wall panel mold;

[0026] A rotating shaft is provided in the support mold, which cooperates with the rotating shaft of the wire laying machine. Axial locators are provided at both ends of the rotating shaft. The support mold positioning seat cooperates with the axial locators to fix the multi-cavity preformed assembly on the lower wall panel mold.

[0027] In a further embodiment, the upper surface of the multi-cavity preform is laid with an upper wall panel.

[0028] In a further embodiment, the upper wall panel and the lower wall panel are made by wire laying, tape laying or hand laying.

[0029] Beneficial effects: In order to solve the manufacturing difficulties of composite variable-section I-beams, such as uneven thickness and fiber wrinkles caused by resin enrichment in the transition zone and corners of the flanges and webs, and to simplify the manufacturing molds, the present invention proposes an efficient and low-cost composite variable-section I-beam manufacturing technology. The complex forming molds are replaced by a combination of rubber soft molds and support molds to solve the manufacturing quality problems of composite variable-section I-beams in the flanges and webs, reduce tooling investment, and improve laying efficiency and material utilization through rotary continuous wire laying, combined overall laying and molding. It is suitable for batch and specialized production, can significantly improve production efficiency and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a rubber soft mold of the present invention.

[0031] Figure 2 It is a schematic diagram of a support mold of the present invention.

[0032] Figure 3 It is a schematic diagram of a combined mold of a rubber soft mold and a supporting mold of the present invention.

[0033] Figure 4 It is a schematic diagram of the combined mold rotating continuous fiber placement box type preform of the present invention.

[0034] Figure 5 It is a schematic diagram of cutting a box-shaped preform into a C-shaped preform according to the present invention.

[0035] Figure 6 It is a schematic diagram of the multi-cavity preformed assembly of the present invention.

[0036] Figure 7 It is a schematic diagram of laying twist strips of the multi-cavity preformed assembly of the present invention.

[0037] Figure 8It is a schematic diagram of laying the lower wall panel on the lower wall panel mold of the present invention.

[0038] Figure 9 It is a schematic diagram of the mold positioning combination of the multi-cavity preform assembly and the lower wall plate of the present invention.

[0039] Figure 10 It is a schematic diagram of laying the upper wall panel on the upper surface of the multi-cavity preformed assembly of the present invention.

[0040] Figure 11 It is a schematic diagram of a multi-beam assembly machined with a variable-section beam according to the present invention.

[0041] Figure markings: variable-section beam 0, combination mold 1, rubber soft mold 1.1, support mold 1.2, rotating shaft 1.3, axial locator 1.4, lower wall panel mold 2, positioning seat 2.1, box-type preform 3, C-shaped preform 4, multi-cavity preform assembly 5, twist strip 5.1, upper wall panel 6, lower wall panel 7, multi-beam assembly 8, wire laying machine 9, wire laying prepreg material 10. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] Example 1:

[0044] A method for forming a variable-section I-beam structure, the method comprising the following steps:

[0045] Step 1: manufacturing a rubber soft mold 1.1 and a supporting mold 1.2;

[0046] Step 2: The combined mold 1 of the rubber soft mold 1.1 and the supporting mold 1.2 is rotated and continuously laid to form a box-shaped preform 3;

[0047] Step 3: Repeat steps 1 and 2 as needed to manufacture multiple combined molds 1 made of the rubber soft mold 1.1 and the support mold 1.2, and rotate and continuously lay wires to form multiple box-shaped preforms 3;

[0048] Step 4: align and assemble the multiple combined molds 1 made of the rubber soft mold 1.1 and the supporting mold 1.2 and the box-shaped preforms 3 in step 3;

[0049] Step 5: Cut a box-shaped preform 3 to form two symmetrical C-shaped preforms 4. After the cut C-shaped preforms 4 are combined with the rubber soft mold 1.1 and the support mold 1.2, they are spliced side by side on both sides of the box-shaped preform 3, positioned and compacted to form a multi-cavity preform assembly 5.

[0050] Step 6: Lay the twist strips 5.1 between the upper and lower surfaces of the multi-cavity preform assembly 5 and the adjacent box-shaped preform 3;

[0051] Step 7: Lay the lower wall panel 7 on the lower wall panel mold 2;

[0052] Step 8: Position and assemble the box-shaped preform 3 assembly on which the twist strips 5.1 are laid in step 6 and the mold on which the lower wall panel 7 is laid in step 7.

[0053] Step 9: Lay the upper wall panel 6 on the upper surface of the box-shaped preformed assembly;

[0054] Step 10: Encapsulation and curing;

[0055] Step 11: Demolding, cutting, and testing are performed; the multi-beam assembly is cut into multiple I-beams with variable cross-sections. This reduces machining work by half and reduces margin loss.

[0056] In one embodiment, Figures 1 to 11 As shown, the rubber soft mold 1.1 and the support mold 1.2 are combined to serve as a rotating continuous wire laying mold for a composite material variable-section I-beam.

[0057] In one embodiment, Figures 1 to 11 As shown, in step 10, the packaging is achieved by using putty strips to seal the vacuum bag to the lower wall panel mold 2 and the outer surface of the rubber soft mold 1.1 and then vacuuming.

[0058] Example 2:

[0059] An auxiliary device for a variable-section I-beam structure, used in the above-mentioned forming method, said auxiliary device comprising: a combined die 1;

[0060] The combined mold 1 is formed by combining a rubber soft mold 1.1 and a supporting mold 1.2;

[0061] The supporting mold 1.2 is installed in the rubber soft mold 1.1, and the outer surface of the supporting mold 1.2 matches the inner shape of the rubber soft mold 1.1.

[0062] In one embodiment, Figures 1 to 11 As shown, the rubber soft mold 1.1 is provided with a fiber reinforcement layer.

[0063] In one embodiment, Figures 1 to 11As shown, the combined mold 1 is provided with several groups, and each combined mold 1 forms a plurality of box-shaped preforms 3 by rotating and continuously placing the wire through the wire placing machine 9 and the wire placing prepreg material 10;

[0064] One of the box-shaped preforms 3 is cut into two symmetrical C-shaped preforms 4 , and the remaining box-shaped preforms 3 are positioned side by side and combined in the two symmetrical C-shaped preforms 4 to form a multi-cavity preform assembly 5 .

[0065] In one embodiment, Figures 1 to 11 As shown, in the multi-cavity preform assembly 5 , twist strips 5 . 1 are laid between adjacent box-shaped preforms 3 .

[0066] In one embodiment, Figures 1 to 11 As shown, the multi-cavity preformed assembly 5 is installed on the lower wall panel mold 2, the lower wall panel 7 is laid on the lower wall panel mold 2, and the two ends of the lower wall panel mold 2 are provided with support mold 1.2 positioning seats 2.1;

[0067] A rotating shaft 1.3 is provided inside the support mold 1.2, which cooperates with the rotating shaft of the wire laying machine 9. Axial locators 1.4 are provided at both ends of the rotating shaft 1.3. The positioning seat 2.1 of the support mold 1.2 cooperates with the axial locator 1.4 to fix the multi-cavity preformed assembly 5 on the lower wall panel mold 2.

[0068] In one embodiment, Figures 1 to 11 As shown, the upper wall panel 6 is laid on the upper surface of the multi-cavity preform.

[0069] In one embodiment, Figures 1 to 11 As shown, the upper wall panel 6 and the lower wall panel 7 are made by a wire laying machine 9. The present invention uses a rotating continuous wire laying method to reduce cutting and double the laying efficiency. It does not require the assembly of a separate "I-beam" structure, which reduces the number of operating steps and reduces energy consumption. The rubber soft mold 1.1 ensures pressurization and stable quality. At the same time, the rubber soft mold 1.1 can be reused to reduce the consumption of auxiliary materials.

[0070] The present invention is laid out as a whole, which improves efficiency, reduces boundary margins, increases material utilization, and reduces unit cost. The present invention is formed as a whole, which improves production efficiency and reduces manufacturing costs. It is suitable for specialized production and reduces the laying of upper wall panels and forming molds, thereby reducing costs.

[0071] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for forming a variable cross-section I-beam structure, characterized in that: The molding method comprises the following steps: Step 1: manufacturing a rubber soft mold and a support mold; Step 2: forming a box-shaped preform by rotating and continuously placing the combined mold of the rubber soft mold and the support mold; Step 3, repeating steps 1 and 2 as needed to manufacture a plurality of combined molds made of the rubber soft mold and the support mold, and rotating and continuously laying wires to form a plurality of box-shaped preforms; Step 4: aligning and assembling the plurality of combined molds made of the rubber soft mold and the support mold and the box-shaped preforms in step 3; Step 5: cutting a box-shaped preform into two symmetrical C-shaped preforms, combining the cut C-shaped preforms with the rubber soft mold and the support mold, and then splicing them side by side on both sides of the box-shaped preform assembly, positioning and compacting them to form a multi-cavity preform assembly; Step 6: Laying twist strips between the upper and lower surfaces of the multi-cavity preform assembly and the adjacent box-shaped preforms; Step 7: Lay the lower wall panel on the lower wall panel mold; Step 8: Position and assemble the box-shaped preform assembly on which the twist strips are laid in step 6 with the mold for laying the lower wall panel in step 7. Step 9: Lay the upper wall panel on the upper surface of the box-shaped preformed assembly; Step 10: Encapsulation and curing; Step 11: Demolding, cutting, and testing are performed; the multi-beam assembly is cut into multiple I-beams with variable cross-sections to reduce machining work and margin loss.

2. The method for forming a variable-section I-beam structure according to claim 1, wherein: The rubber soft mold and the support mold are combined to serve as a rotary continuous wire laying mold for composite material variable-section I-beams.

3. The method for forming a variable-section I-beam structure according to claim 1, wherein: In step 10, the packaging is achieved by using putty strips to seal the vacuum bag to the lower wall panel mold and the outer surface of the rubber soft mold and then vacuuming.

4. The auxiliary device of a variable-section I-beam structure according to claim 1, used to implement the forming method of a variable-section I-beam structure according to any one of claims 1 to 3, characterized in that: The auxiliary device includes: a combined mold; The combined mold is formed by combining a rubber soft mold and a support mold; The supporting mold is installed in the rubber soft mold, and the outer surface of the supporting mold matches the inner shape of the rubber soft mold.

5. The auxiliary device for a variable-section I-beam structure according to claim 4, characterized in that: The rubber soft mold is provided with a fiber reinforcement layer.

6. The auxiliary device for a variable-section I-beam structure according to claim 4, characterized in that: The combined mold is provided with several groups, and each combined mold forms a plurality of box-shaped preforms by rotating and continuously placing the wire through the wire placing machine and the wire placing prepreg material; One of the box-shaped preforms is cut into two symmetrical C-shaped preforms, and the remaining box-shaped preforms are positioned side by side and combined in the two symmetrical C-shaped preforms to form a multi-cavity preform assembly.

7. The auxiliary device for a variable-section I-beam structure according to claim 6, characterized in that: In the multi-cavity preform assembly, twist strips are laid between adjacent box-shaped preforms.

8. The auxiliary device for a variable-section I-beam structure according to claim 6, characterized in that: The multi-cavity preformed assembly is installed on the lower wall panel mold, the lower wall panels are laid on the multiple lower wall panel molds, and support mold positioning seats are provided at both ends of the lower wall panel mold; A rotating shaft is provided in the support mold, which cooperates with the rotating shaft of the wire laying machine. Axial locators are provided at both ends of the rotating shaft. The support mold positioning seat cooperates with the axial locators to fix the multi-cavity preformed assembly on the lower wall panel mold.

9. The auxiliary device for a variable-section I-beam structure according to claim 8, characterized in that: The upper surface of the multi-cavity preform is laid with an upper wall panel.

10. The auxiliary device for a variable-section I-beam structure according to claim 9, characterized in that: The upper wall panel and the lower wall panel are made of one of wire laying, tape laying or hand laying.

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