Forming method and forming tool of composite material tubular shaft

Abstract

The invention discloses a forming method of a composite material tubular shaft. The forming method comprises the following steps that S1, the composite material tubular shaft is pre-formed through a forming tool; s2, a non-independent air bag is placed in the preformed composite material pipe shaft to form a combined body, and the combined body is placed in a cavity of a lower die of a forming tool; s3, the two ends of the air bag penetrate through anti-disengaging rings; s4, the air tap male head is plugged into the air bag, and it is guaranteed that the air bag evenly wraps the outer ring of the air tap male head; and S5, the anti-disengaging ring is placed in a clamping groove of a lower die of the forming tool, and after the anti-disengaging ring is placed in place, the air tap male head is plugged into the air bag as much as possible. When the composite material tubular shaft is prepared by adopting the forming method and the forming tool of the composite material tubular shaft, the structure of an air bag can be simplified, the cost of the air bag is simplified and reduced, and meanwhile, auxiliary systems used in the forming process are simplified, for example, a pressing system and an air suction system are needed for a child-mother bag; according to the forming method, only one pressing system is needed, and the cost is further reduced.

Description

Technical Field

[0001] This invention relates to the field of molding technology for composite material tube shafts, and in particular to a molding method and molding tooling for composite material tube shafts. Background Technology

[0002] In fields such as composite materials, tubular shafts are common and indispensable. Take driveshafts as an example; they are key components for transmitting power in aircraft. Their primary task is to efficiently and reliably transmit the enormous power generated by the engine to the rotor, propeller, or other accessories such as generators and hydraulic pumps. Because they operate in harsh environments with high speeds, high torque, severe vibrations, and large temperature differences, and because failure would have catastrophic consequences, the design and manufacturing process of aerospace driveshafts is particularly critical. Currently, the airbag molding method for tubular shaft products has the following drawbacks:

[0003] Independent airbags are expensive: they require customized design and frequent replacements;

[0004] Insufficient sealing reliability: Traditional integral air nozzles require complete replacement after damage;

[0005] High system complexity: For example, a dual-pressure system is required for mother and child bags, resulting in higher production costs.

[0006] Therefore, it is necessary to design a molding method and molding tooling for composite material tube shafts to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a molding method and molding tooling for composite material tube shafts.

[0008] The technical solution of the present invention is: a method for forming a composite material tube shaft, comprising the following steps:

[0009] S1: Pre-form composite material tube shafts using molding fixtures;

[0010] S2: Place the non-independent airbag inside the preformed composite material tube shaft to form an assembly, and place the assembly into the cavity of the lower mold of the molding tooling;

[0011] S3: Pass both ends of the airbag through the anti-detachment ring;

[0012] S4: Insert the male valve into the air bag, ensuring that the air bag evenly covers the outer ring of the male valve.

[0013] S5: Place the anti-detachment ring in the slot of the lower mold of the molding fixture. After it is in place, push the male air nozzle as far as possible into the air bag so that the air bag is pressed between the male air nozzle and the anti-detachment ring.

[0014] S6: Remove the airbag bag exposed outside the anti-detachment ring, and tighten the fastening nut with the washer installed to the anti-detachment ring to press the airbag bag tightly to prevent the airbag bag from detaching during inflation;

[0015] S7: Close the upper and lower molds of the forming fixture to fix the anti-detachment ring;

[0016] S8: The molded tooling after mold closing is sent into the autoclave, the male air nozzle is connected to the female air nozzle to inflate the product, and the composite product is cured and formed according to the set program.

[0017] The preforming process in S1 specifically involves laying composite material tube prepreg on the surface of a stainless steel core mold and then removing the prepreg composite material tube to obtain the preformed composite material tube.

[0018] The airbag is elastic and heat-resistant.

[0019] A tooling for molding the aforementioned composite material tube shaft includes: an upper mold, a lower mold, a male air nozzle, and an anti-detachment ring; the outer edge of the anti-detachment ring has an annular boss; both the upper mold and the lower mold have grooves that match the annular boss; one end of the male air nozzle is fixed inside the anti-detachment ring by a fastening nut, and the other end extends out of the fastening nut; the end of the fastening nut extending out of the male air nozzle is provided with a locking nut to prevent the male air nozzle from detaching from the anti-detachment ring.

[0020] After the upper mold and the lower mold are closed, the fastening nut is fixed to the end face of the closed upper mold and the lower mold by the locking screw.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects: When using the composite material tube shaft molding method and molding tooling proposed in this invention to prepare composite material tube shafts, the structure of the airbag can be simplified, the cost of the airbag can be reduced, and the auxiliary systems used in the molding process can be simplified. For example, the mother-daughter bag requires two systems, namely, pressure and air suction, while the molding method of the present invention only requires one pressure system, further reducing the cost. Attached Figure Description

[0022] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a cross-sectional view of the present invention.

[0025] The labels in the attached diagram are:

[0026] 1. Upper mold, 2. Lower mold, 3. Male air nozzle, 4. Anti-detachment ring, 5. Fastening nut, 6. Locking nut, 7. Locking screw. Detailed Implementation

[0027] Example

[0028] See Figure 1 and Figure 2 The molding method of a composite material tube shaft according to this embodiment includes the following steps:

[0029] S1: Pre-form composite material tube shafts using molding fixtures;

[0030] S2: Place the non-independent airbag inside the preformed composite material tube shaft to form an assembly, and place the assembly into the cavity of the lower mold 2 of the molding tooling;

[0031] S3: Pass both ends of the airbag through the anti-detachment ring 4;

[0032] S4: Insert the male air valve 3 into the air bag, ensuring that the air bag evenly covers the outer ring of the male air valve 3;

[0033] S5: Place the anti-detachment ring 4 in the slot of the lower mold 2 of the molding fixture. After it is in place, push the male air nozzle 3 as far as possible into the air bag so that the air bag is pressed between the male air nozzle 3 and the anti-detachment ring 4.

[0034] S6: Remove the airbag bag exposed outside the anti-detachment ring 4, and tighten the fastening nut 5 with the washer installed to the anti-detachment ring 4 to press the airbag bag tightly to prevent the airbag bag from detaching during inflation.

[0035] S7: Close the upper mold 1 and lower mold 2 of the molding fixture to fix the anti-detachment ring 4;

[0036] S8: Send the molded tooling after mold closing into the autoclave, connect the male air nozzle 3 to the female air nozzle to inflate, and solidify the composite product according to the set program.

[0037] Furthermore, the preforming in S1 specifically involves laying composite material tube prepreg on the surface of a stainless steel core mold, and then removing the laid composite material tube to obtain a preformed composite material tube.

[0038] Furthermore, the airbag is elastic and heat-resistant.

[0039] Furthermore, the male nozzle 3 is in a modular form, which increases replaceability and enhances the performance of the metal tooling structure.

[0040] A tooling for molding the aforementioned composite material tube shaft includes: an upper mold 1, a lower mold 2, a male air nozzle 3, and an anti-detachment ring 4; the outer edge of the anti-detachment ring 4 has an annular boss; both the upper mold 1 and the lower mold 2 have grooves that match the annular boss; one end of the male air nozzle 3 is fixed inside the anti-detachment ring 4 by a fastening nut 5, and the other end extends out of the fastening nut 5; a locking nut 6 is provided on the end of the fastening nut 5 that extends out of the male air nozzle 3 to prevent the male air nozzle 3 from detaching from the anti-detachment ring 4.

[0041] Furthermore, after the upper mold 1 and the lower mold 2 are closed, the fastening nut 5 is fixed to the end face of the upper mold 1 and the lower mold 2 after they are closed by the locking screw 7.

[0042] When using the composite material tube shaft molding method and molding tooling proposed in this invention to prepare composite material tube shafts, the structure of the airbag can be simplified, the cost of the airbag can be reduced, and the auxiliary systems used in the molding process can be simplified. For example, the mother-daughter bag requires two systems, namely pressure and air suction, while the molding method of this invention only requires one pressure system, further reducing costs.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of forming a composite material tube shaft, characterized by, The method comprises the following steps: S1: preforming a composite pipe shaft by using a forming tool; S2: placing a non-independent air bag inside the preformed composite pipe shaft to form an assembly, and placing the assembly into a cavity of a lower die of the forming tool; S3: passing the air bag through a anti-falling ring at both ends; S4: inserting a male head of a gas nozzle into the air bag to ensure that the air bag uniformly wraps around the outer circle of the male head of the gas nozzle; S5: placing the anti-falling ring into a clamping groove of the lower die of the forming tool, and after the anti-falling ring is placed in place, the male head of the gas nozzle is inserted into the air bag as much as possible, so that the air bag is compressed between the male head of the gas nozzle and the anti-falling ring; S6: removing the air bag exposed outside the anti-falling ring, and tightening the fastening nut with the gasket to the anti-falling ring to compress the air bag, so as to avoid the air bag from being separated during inflation; S7: closing the upper die and the lower die of the forming tool to fix the anti-falling ring; S8: sending the closed forming tool into a hot press tank, connecting the male head of the gas nozzle to the female head for inflation, and realizing curing and forming of the composite product according to a set program.

2. A method of forming a composite tube shaft according to claim 1, wherein: The preforming in S1 specifically comprises laying and pasting a composite pipe shaft pre-impregnated material on the surface of a stainless steel core mold, and taking down the laid and pasted composite pipe shaft to obtain a preformed composite pipe shaft.

3. The method of claim 1, wherein: The air bag is elastic and resistant to high temperature.

4. A tooling for forming a composite tube shaft according to any one of claims 1 to 3, characterized in that, The method comprises: The upper die, the lower die, the gas nozzle male head and the anti-falling ring; the outer edge of the anti-falling ring has an annular boss; the upper die and the lower die both have a clamping groove matched with the annular boss; one end of the gas nozzle male head is fixed in the anti-falling ring through a fastening nut, and the other end extends out of the fastening nut; the end of the fastening nut extending out of the gas nozzle male head is provided with a locking nut preventing the gas nozzle male head from being separated from the anti-falling ring.

5. A tooling for forming a composite tube shaft according to claim 3, wherein: When the upper die and the lower die are closed; the fastening nut is fixed on the end surface of the closed upper die and lower die through the locking screw.

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