Manufacturing method of metal lining fiber full-winding composite material transmission shaft

Abstract

The invention provides a manufacturing method of a metal lining fiber full-winding composite material transmission shaft. The method comprises the steps that S1, a metal bushing is manufactured, wherein the metal bushing comprises an integrated middle thin wall part and an end connecting part used for being connected with a flange; s2, winding the metal bushing through the fiber rod impregnated with the resin; s3, vacuumizing treatment and high-temperature curing treatment are conducted in sequence; according to the composite material transmission shaft, the integrally-formed middle thin-wall part with the thin wall in the middle and the end connecting parts located at the two ends of the middle thin-wall part are manufactured through the aluminum alloy material, then the fiber full-winding technology is adopted, and the composite material transmission shaft is obtained; and meanwhile, the weight of the transmission shaft is reduced, the characteristic of high designability of the composite material is fully played, the composite material transmission shaft with high torsional strength is obtained, and the use durability and reliability of a connecting structure are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite material transmission shafts, and in particular to a method for manufacturing a metal lined fiber fully wound composite material transmission shaft. Background Art

[0002] The transmission shaft lining is responsible for transmitting torque and outputting power. Its main function is to transmit the torque generated by the power system to the actuation system over a long distance. Compared with traditional metal transmission shafts, composite transmission shafts have the advantages of light weight, corrosion resistance, and good fatigue performance.

[0003] The existing composite material transmission shafts are usually made of a combination of mechanical connection, adhesive connection or hybrid connection between the main shaft tube and the metal flanges at both ends; however, these connection methods are difficult to ensure the long-term stable load transmission requirements of the transmission shaft, and the durability and reliability are poor;

[0004] In addition, the existing composite material drive shaft tube forming process requires molding, pretreatment and demolding process steps. The production and manufacturing process (the composite material layer is made into a tubular structure through a mold core, and is connected to the metal shaft tube set after being separated from the mold core) is relatively complicated and the production efficiency is also low. Summary of the invention

[0005] In view of this, the problem to be solved by the present invention is to provide a method for manufacturing a metal lined fiber fully wound composite material transmission shaft.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for manufacturing a metal lined fiber fully wound composite material transmission shaft comprises the following steps:

[0008] S1: manufacturing a metal bushing, the metal bushing comprising an integrated middle thin-walled portion and an end connection portion for connecting a flange;

[0009] S2: winding the metal bushing with resin-impregnated fiber strips;

[0010] S3: performing vacuum treatment and high temperature curing treatment in sequence.

[0011] A reinforcement groove is also constructed on the connecting portion between the middle thin-walled portion and the end head.

[0012] There are 2 to 5 reinforcement grooves at each end, the groove spacing is 10 to 50 mm, and the groove width is 10 to 50 mm.

[0013] S21: Winding the resin-impregnated fiber strips 1 to 4 layers at a winding angle of 75° to 89°, and transitioning the left and right ends of the single-layer stroke to the edges 13 of the reinforcement grooves at both ends in a layer-by-layer increment of 2 to 5 mm;

[0014] S22: Winding the resin-impregnated fiber strips in 1 to 4 layers at a winding angle of 10° to 45°, and winding the reinforcement groove and the middle layer to the edge of the next reinforcement groove;

[0015] S23: Wind the resin-impregnated fiber strips in 1 to 2 layers at a winding angle of 80° to 89°, and transition the left and right ends of the single-layer stroke to the edge of the terminal connection portion in a layer-by-layer increment of 2 to 5 mm.

[0016] The S21 and S22 are repeated at least twice.

[0017] The advantages and positive effects of the present invention are:

[0018] An aluminum alloy material is used to manufacture an integrally formed middle thin-walled portion and end connecting portions located at both ends of the middle thin-walled portion, and then a fiber full-winding process is used to manufacture a composite material drive shaft, which simplifies the molding, pretreatment, demolding and other process links in the existing manufacturing process. At the same time, while achieving weight reduction of the drive shaft, the strong designability of the composite material is fully utilized to obtain a composite material drive shaft with high torsional strength, and the durability and reliability of the connection structure are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is an overall structural diagram of a metal lined fiber fully wound composite material transmission shaft of the present invention;

[0021] Figure 2 yes Figure 1 A magnified view of the reinforcement groove;

[0022] In the figure: a metal bushing 1, a middle thin-walled portion 11, and an end connection portion 12. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] like Figure 1 to Figure 2 As shown, the present invention provides a method for manufacturing a metal lined fiber fully wound composite material transmission shaft

[0027] The steps include:

[0028] S1: Manufacturing a metal bushing 1, which includes an integrated middle thin-walled portion 11 and an end connection portion 12 for connecting a flange. On the one hand, the weight of the transmission shaft can be reduced and the overall weight can be reduced. On the other hand, the end connection portion 12 and the middle thin-walled portion 11 are integrally formed so that after the end connection portion 12 is connected to the metal flange, it can ensure the long-term stable load transmission requirement of the transmission shaft and improve durability and reliability.

[0029] Specifically, the aluminum alloy pipe is made of an integrated thin-walled middle portion 11 and end connection portions 12 located at both ends of the middle thin-walled portion 11 by means of spinning and thinning and CNC machining. Reinforcement grooves 13 are constructed on the middle thin-walled portion 11 and the end connection portions 12. Two to five reinforcement grooves 13 are arranged at each end, the slotting position spacing is 10 to 50 mm, and the groove width is 10 to 50 mm. The alloy pipe is selected from aluminum alloy pipes with the same inner diameter and a wall thickness of 6 mm to 15 mm. The aluminum alloy pipe is subjected to spinning and thinning by means of spinning and thinning equipment. The overall thinning rate of the aluminum alloy pipe is controlled to be 75%, and the single thinning rate is 25% to 30%; the diameter rotation speed is controlled to be 80 rpm to 20 0rpm; when the wall thickness of the aluminum alloy pipe is thicker and the thinning rate of 75% cannot meet the wall thickness requirement of the finished product, stress relief annealing treatment can be carried out when the aluminum alloy pipe is rolled thinning rate to 50%. The annealing adopts air furnace annealing, the temperature is selected from 350℃ to 380℃, the annealing holding time is from 40 minutes to 2 hours, the cooling method is air cooling, and the two ends are finely processed by CNC machining, including the connection holes and keyways for connecting flanges, and the reinforcement groove 13 is pre-processed; finally, the outside of the metal liner 1 is polished, sandblasted or electro-sparked to give the surface a certain roughness, and finally acetone or other organic solvents are used to clean and remove the dirt on the surface of the metal liner 1 and blow it dry.

[0030] S2: Winding the resin-impregnated fiber strips around the metal bushing, and performing multi-directional and variable-angle fiber strip winding reinforcement on the reserved reinforcement groove 13 to form a composite material layer to ensure the overall connection strength of the transmission shaft;

[0031] S21: Winding the resin-impregnated fiber strips 1 to 4 layers at a winding angle of 75° to 89°, and transitioning the left and right ends of the single-layer stroke to the edges 13 of the reinforcement grooves at both ends in a layer-by-layer increment of 2 to 5 mm;

[0032] S22: Winding the resin-impregnated fiber strips 1 to 4 layers at a winding angle of 10° to 45°, and winding the reinforcement groove 13 and the middle layer to the edge of the next reinforcement groove;

[0033] S23: Winding the resin-impregnated fiber strips 1 to 2 layers at a winding angle of 80° to 89°, and transitioning the left and right ends of the single-layer stroke to the edge of the terminal connection portion 12 in a layer-by-layer increment of 2 to 5 mm;

[0034] S21 and S22 are repeated at least twice;

[0035] Compared with the existing complex manufacturing process in which the composite material layer is made into a tubular structure through a mold core and then connected to the metal shaft tube sleeve after being separated from the mold core, the present technical solution creatively winds the fiber strips directly on the manufactured metal shaft liner 1 to form a composite material layer, directly omitting the molding, pretreatment and demolding processes.

[0036] S3: performing vacuum treatment and high temperature curing treatment in sequence;

[0037] The wound composite material transmission shaft is wrapped with a vacuum bag and subjected to a vacuum treatment to reduce the porosity on the composite material layer, ensure the torsional strength and fatigue resistance, and then high-temperature curing is performed according to the adopted resin system to obtain a finished composite material transmission shaft;

[0038] The curing furnace can be continuous or fixed, with a heating power greater than 50KW, a plastic temperature increase of 0.5 to 2°C / min, and a temperature uniformity of less than ±5°C. The curing process is assisted by adding a corresponding rotating device for the finished composite material drive shaft, with a rotation rate controlled at 5 to 20r / min. The curing temperature is usually set at 70°C to 90°C for 2h, then raised to 100°C to 140°C for 4h. It is then taken out of the furnace after natural cooling.

[0039] Through comparative experiments, it is found that the quality of the composite material drive shaft manufactured by the manufacturing method is lower than that of the existing composite material drive shaft, but the structural strength is higher than that of the existing composite material drive shaft.

[0040] The working principle and working process of the present invention are as follows:

[0041] S1: manufacturing a metal bushing 1, wherein the metal bushing 1 comprises an integrated middle thin-walled portion 11 and an end connection portion 12 for connecting a flange, and a reinforcement groove 13 is constructed on the middle thin-walled portion 11 and the end connection portion 12;

[0042] S2: Winding the resin-impregnated fiber strips around the metal bushing;

[0043] S21: Winding the resin-impregnated fiber strips 1 to 4 layers at a winding angle of 75° to 89°, and transitioning the left and right ends of the single-layer stroke to the edges 13 of the reinforcement grooves at both ends in a layer-by-layer increment of 2 to 5 mm;

[0044] S22: Winding the resin-impregnated fiber strips into 1 to 4 layers at a winding angle of 10° to 45°, and winding the reinforcement slot 13 and the middle layer to the edge of the next reinforcement slot by gradually expanding the end virtual pole hole;

[0045] S23: Winding the resin-impregnated fiber strips 1 to 2 layers at a winding angle of 80° to 89°, and transitioning the left and right ends of the single-layer stroke to the edge of the terminal connection portion 12 in a layer-by-layer increment of 2 to 5 mm;

[0046] S21 and S22 are repeated at least twice;

[0047] S3: performing vacuum treatment and high temperature curing treatment in sequence.

[0048] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A method for manufacturing a metal lined fiber fully wound composite material transmission shaft, characterized in that; The steps include: S1: manufacturing a metal bushing (1), wherein the metal bushing (1) comprises an integral middle thin-walled portion (11) and an end connection portion (12) for connecting a flange; S2: Winding the metal bushing (1) with the resin-impregnated fiber strip; S3: performing vacuum treatment and high temperature curing treatment in sequence.

2. The method for manufacturing a metal lined fiber fully wound composite material transmission shaft according to claim 1, characterized in that; A reinforcement groove (13) is also constructed on the middle thin-walled portion (11) and the end connecting portion (12).

3. The method for manufacturing a metal lined fiber fully wound composite material transmission shaft according to claim 2, characterized in that; Two to five reinforcement grooves (13) are arranged at each end, the spacing between the groove positions is 10 to 50 mm, and the groove width is 10 to 50 mm.

4. The method for manufacturing a metal lined fiber fully wound composite material transmission shaft according to claim 1, characterized in that ； S21: Winding the resin-impregnated fiber strips in 1 to 4 layers at a winding angle of 75° to 89°, and transitioning the left and right ends of the single-layer stroke to the edges of the reinforcement grooves at both ends (13) in a layer-by-layer increment of 2 to 5 mm; S22: Winding the resin-impregnated fiber strips in 1 to 4 layers at a winding angle of 10° to 45°, and winding the reinforcement groove (13) and the middle layer to the edge of the next reinforcement groove; S23: Wind the resin-impregnated fiber strips in 1 to 2 layers at a winding angle of 80° to 89°, and transition the left and right ends of the single-layer stroke to the edge of the end connection portion (12) in a layer-by-layer increment of 2 to 5 mm.

5. The method for manufacturing a metal lined fiber fully wound composite material transmission shaft according to claim 4, characterized in that; The S21 and S22 are repeated at least twice.

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