A preparation method and preparation device for near-net-shape carbon-carbon round tube

Abstract

The present invention discloses a preparation method and a preparation device for a near-net-shape carbon-carbon round tube, and relates to the technical field of carbon-carbon round tube preparation. The present invention replaces the traditional 2.5D weaving method processing and forming mode, meets the large-scale carbon-carbon round tube production and preparation needs, has high product utilization rate, high processing efficiency, and greatly improves production efficiency in the batch production and preparation process of the enterprise. The traditional 2.5D weaving method processing and forming mode has a single batch workpiece production process time of 45-60 days, while the production process time of the processing method of the present invention is 20-30 days, and the efficiency is more than doubled, and the prepared carbon-carbon round tube has good anti-bending and anti-flexing effects, which can reach 1.5 times that of the traditional processing method.

Description

Technical Field

[0001] The invention relates to the technical field of carbon-carbon round tube preparation, in particular to a near-net-shape preparation method of a carbon-carbon round tube and a preparation device thereof. Background Art

[0002] Near-net forming refers to a forming technology in which parts only need a small amount of processing or no processing after being formed before they can be used as mechanical components. It is based on multidisciplinary high-tech achievements such as new materials, new energy, mechatronics, precision mold technology, computer technology, automation technology, numerical analysis and simulation technology, and has transformed traditional blank forming technology from rough forming to high-quality, efficient, high-precision, lightweight, and low-cost forming technology. It enables the formed mechanical components to have precise shape, high dimensional accuracy, shape and position accuracy, and good surface roughness. This technology includes professional fields such as near-net-shape casting, precise plastic forming, precise connection, precision heat treatment modification, surface modification, and high-precision molds, and is a comprehensive integrated technology of new processes, new equipment, new materials, and various new technological achievements.

[0003] At present, the traditional carbon-carbon round tube material is processed and formed by the 2.5D weaving method, and there are the following technical problems: 1. The weaving molding process has the technical problem of difficulty in size control, and its product utilization rate is 50-70%, which is low; 2. In the production and processing of large quantities of carbon-carbon round tubes, there are large processing volume, low processing efficiency, and long manufacturing time. The subsequent carbon-carbon round tube preparation and densification adopts vapor deposition. Due to its special structure, the vapor deposition effect is poor, and it is easy to form a density gradient and surface carbon black. In the traditional process, the carbon fiber content is low and the curing effect is poor. Only vapor deposition can be used first, and liquid phase is easy to deform; 3. The products prepared by the 2.5D weaving method are subjected to pressure difference in the Z direction, and have poor bending and bending resistance. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a near-net-shape preparation method and a preparation device for carbon-carbon round tubes, which replace the traditional 2.5D weaving method processing and forming method, meet the large-scale production and preparation needs of carbon-carbon round tubes, have high product utilization rate and high processing efficiency, and greatly improve production efficiency in the batch production and preparation process of enterprises. The traditional 2.5D weaving method processing and forming method has a single batch of workpiece production process time of 45-60 days, while the production process time of the processing method of the present invention is 20-30 days, and the efficiency is more than doubled. The prepared carbon-carbon round tubes have good anti-bending and anti-flexing effects, which can reach 1.5 times that of the traditional processing method.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a preparation method of a carbon-carbon round tube near net shape, comprising the following steps:

[0006] Step A: soaking phenolic resin in pre-oxidized needle felt with one layer of carbon cloth and two layers of mesh or two layers of carbon cloth and three layers of mesh, the thickness of the pre-oxidized needle felt is 0.5-3mm, and the soaking time is 2-10h;

[0007] Step B: Drain the pre-oxidized needle felt soaked in phenolic resin by centrifugal drying at a speed of 0.5-5 rpm for 1-5 h. The residual amount of phenolic resin in the pre-oxidized needle felt is controlled at 50-80% and the density is controlled at 0.4-0.45 g / cm 3 ;

[0008] Step C: Wind the preoxidized needle felt prepared in step B onto the core rod 2 with 0.2-1mm carbon filaments, and then evenly wind it with 0.2-2mm glass fiber tape using a winding machine to form a layer to be pressed 3. The fiber density before winding is controlled to be 0.4-0.45g / cm 3 , the fiber density after winding is controlled to 0.45-0.52g / cm 3 Step D: Place the core rod 2 into the lower die 6, control the pressing pressure to 10-100 tons, control the compression amount to 2-5mm, and control the fiber density after pressing to 0.55-0.7g / cm 3 ;

[0009] Step E: The material pressed in step D is subjected to high temperature curing, the temperature is controlled to be 100-200°C, the time is controlled to be 5-24h, and then demolding operation, carbonization operation, impregnation and re-carbonization operation, high temperature treatment operation, machining operation, surface coating CVD operation are sequentially performed to obtain a carbon-carbon round tube.

[0010] A preparation device for near-net-shape forming of carbon-to-carbon round tubes, characterized in that it includes a lower die arranged on a transverse shift seat, the interior of the lower die can horizontally hold a core rod, a pushing portion is arranged on the lateral side of the transverse shift seat, a feeding portion is arranged on the longitudinal side of the transverse shift seat, a top frame is arranged above the feeding portion, and a clamping and conveying portion and a pressing portion are arranged between the top frame and the transverse shift seat.

[0011] As a further optimization of the present invention, the pushing part includes a guide rail matching the slider at the bottom of the transverse moving seat, and racks are arranged on the upper and lower surfaces of the transverse plate arranged on the side of the transverse moving seat, and the racks are respectively meshed with the driving gear at the output shaft end of the first motor and the driven gear at the top of the pillar for transmission.

[0012] As a further optimization of the present invention, the feeding part includes a bracket seat, and a conveying roller is rotatably arranged at a horizontal lateral interval on the top of the bracket seat.

[0013] As a further optimization of the present invention, the clamping and transporting part includes a second motor, a screw connected to the output shaft of the second motor matches the screw nut at the top of the bracket plate, and the lower end of the first oil cylinder at the bottom of the bracket plate is connected to the lifting plate.

[0014] As a further optimization of the present invention, a second oil cylinder is arranged at the bottom of the lifting plate, the lower part of the second oil cylinder is hinged to the top of the clamping plate through a hinge seat, and the movable block at one end of the connecting rod hingedly arranged on the outer wall of the second oil cylinder is movably arranged in the arc groove of the clamping plate.

[0015] As a further optimization of the present invention, the die portion includes an upper die with a U-shaped shell structure matched with the lower die, the top of the upper die is connected to the telescopic shaft end of the third cylinder, and the lower guide tube set at the top of the upper die is matched with the upper guide rod.

[0016] Beneficial effects of the invention: The invention provides a preparation method and a preparation device for the near-net shape of a carbon-carbon round tube, which replaces the traditional 2.5D weaving method processing and forming method, meets the production and preparation needs of large quantities of carbon-carbon round tubes, has high product utilization rate and high processing efficiency, and greatly improves production efficiency in the batch production and preparation process of the enterprise. The traditional 2.5D weaving method processing and forming method has a single batch of workpiece production process time of 45-60 days, while the production process time of the processing method of the invention is 20-30 days, and the efficiency is more than doubled, and the prepared carbon-carbon round tube has good anti-bending and anti-flexing effects, which can reach 1.5 times that of the traditional processing method.

[0017] 1. The present invention adopts a new preparation method to prepare carbon-carbon round tubes, and the density of the pre-oxidized needle felt can only reach 0.15g / cm 3 The carbon-carbon round tube fiber density prepared by pressing of the present invention can reach 0.5g / cm 3 As described above, the carbon-carbon round tube has good anti-bending and anti-flexing effects. In the present invention, the phenolic resin and the pre-oxidized needle felt cooperate with each other, and the strength between the layers is improved after pressing and curing, thereby enhancing the mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the main structure when the lower mold of the present invention is located directly below the upper mold.

[0020] Figure 3 It is a schematic diagram of the main structure of the push portion in the present invention.

[0021] Figure 4 It is a schematic diagram of the main structure of the clamping and conveying part in the present invention.

[0022] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0023] Figure 6 It is a schematic diagram of the main structure of the die portion in the present invention.

[0024] Figure 7 It is a schematic diagram of the main structure at the upper mold position in the present invention.

[0025] Figure 8 It is a schematic diagram of the cross-sectional structure at BB in the present invention.

[0026] The text labels in the figure are as follows: 1. transverse shift seat; 2. core rod; 3. layer to be pressed; 4. pushing part; 5. feeding part; 6. lower mold; 7. clamping and conveying part; 8. top frame; 9. die pressing part; 401. slider; 402. guide rail; 403. driving gear; 404. first motor; 405. transverse plate; 406. rack; 407. driven gear; 408. pillar; 501. conveying roller; 502. bracket seat; 701. second motor; 702. screw rod; 703. bracket plate; 704. screw rod nut; 705. first cylinder; 706. lifting plate; 707. second cylinder; 708. connecting rod; 709. hinge seat; 710. clamping plate; 711. movable block; 901. upper mold; 902. third cylinder; 903. lower guide tube; 904. upper guide rod. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0028] like Figure 1-Figure 8 As shown, the specific structure of the present invention is: a method for preparing a carbon-carbon round tube near net shape, comprising the following steps:

[0029] Step A: soaking phenolic resin in pre-oxidized needle felt with one layer of carbon cloth and two layers of mesh or two layers of carbon cloth and three layers of mesh, the thickness of the pre-oxidized needle felt is 0.5-3mm, and the soaking time is 2-10h;

[0030] Step B: Drain the pre-oxidized needle felt soaked in phenolic resin by centrifugal drying at a speed of 0.5-5 rpm for 1-5 h. The residual amount of phenolic resin in the pre-oxidized needle felt is controlled at 50-80% and the density is controlled at 0.4-0.45 g / cm 3 ;

[0031] Step C: Wind the preoxidized needle felt prepared in step B onto the core rod 2 with 0.2-1mm carbon filaments, and then evenly wind it with 0.2-2mm glass fiber tape using a winding machine to form a layer to be pressed 3. The fiber density before winding is controlled to be 0.4-0.45g / cm 3 , the fiber density after winding is controlled to 0.45-0.52g / cm 3Step D: Place the core rod 2 into the lower die 6, control the pressing pressure to 10-100 tons, control the compression amount to 2-5mm, and control the fiber density after pressing to 0.55-0.7g / cm 3 ;

[0032] Step E: The material pressed in step D is subjected to high temperature curing, the temperature is controlled to be 100-200°C, the time is controlled to be 5-24h, and then demolding operation, carbonization operation, impregnation and re-carbonization operation, high temperature treatment operation, machining operation, surface coating CVD operation are sequentially performed to obtain a carbon-carbon round tube.

[0033] A preparation device for near-net-shape forming of a carbon-to-carbon round tube comprises a lower die 6 arranged on a transverse shift seat 1, a core rod 2 can be horizontally and laterally held inside the lower die 6, a pushing portion 4 is arranged on the lateral side of the transverse shift seat 1, a feeding portion 5 is arranged on the longitudinal side of the transverse shift seat 1, a top frame 8 is arranged above the feeding portion 5, a clamping and conveying portion 7 and a die pressing portion 9 are arranged between the top frame 8 and the transverse shift seat 1, the pushing portion 4 functions to push the transverse shift seat 1 to the bottom of the die pressing portion 9 to provide a basis for the die pressing operation, the feeding portion 5 functions to horizontally and longitudinally convey the core rod 2 having a layer 3 to be pressed, the clamping and conveying portion 7 functions to clamp the material on the feeding portion 5 and convey it to the lower die 6, and the present device can greatly improve the processing efficiency of carbon-to-carbon round tube forming and conveying.

[0034] As a specific embodiment of the present invention, in order to facilitate the horizontal and transverse conveying of the lower mold 6 to the bottom of the die portion 9, the pushing portion 4 includes a guide rail 402 matching the slider 401 at the bottom of the transverse shift seat 1, and racks 406 are provided on the upper and lower surfaces of the transverse plate 405 provided on the side of the transverse shift seat 1. The racks 406 are respectively engaged with the driving gear 403 at the output shaft end of the first motor 404 and the driven gear 407 at the top of the pillar 408 to drive the first motor 404, the driving gear 403 and the driven gear 407 to rotate, and the rack 406 drives the transverse shift seat 1 to make a linear motion in the horizontal direction, so as to horizontally and transversely convey the lower mold 6 to the bottom of the die portion 9.

[0035] As a specific embodiment of the present invention, in order to facilitate the horizontal longitudinal conveying operation of the core rod 2 with a layer to be pressed 3, the feeding part 5 includes a bracket seat 502, and a conveying roller 501 is rotatably arranged at a horizontal lateral interval on the top of the bracket seat 502. The conveying roller 501 is connected to the motor drive structure through a transmission chain. The arrangement of the conveying roller 501 and the motor drive structure is a conventional existing mature technology in the field of conveying equipment technology, which is widely known to technicians in this field, so it will not be described in detail.

[0036] As a specific embodiment of the present invention, in order to facilitate the clamping of the core rod 2 on the conveying roller 501 and transporting it to the lower mold 6, the clamping and transporting part 7 includes a second motor 701, a screw rod 702 connected to the output shaft of the second motor 701 matches the screw rod nut 704 at the top of the bracket plate 703, and the lower end of the first oil cylinder 705 at the bottom of the bracket plate 703 is connected to the lifting plate 706.

[0037] As a specific embodiment of the present invention, in order to facilitate the clamping of the core rod 2 on the conveying roller 501 and transport it to the lower mold 6, a second oil cylinder 707 is arranged at the bottom of the lifting plate 706, and the lower part of the second oil cylinder 707 is hinged to the top of the clamping plate 710 through the hinge seat 709, and the movable block 711 at one end of the connecting rod 708 hingedly arranged on the outer wall of the second oil cylinder 707 is movably arranged in the arc groove of the clamping plate 710, and the clamping plate 710 is an arc plate-shaped structure, which drives the second oil cylinder 707, and the telescopic shaft end of the second oil cylinder 707 extends downward, and the two clamping plates 710 are outward. Open and drive the first oil cylinder 705 to make the two clamps 710 drop to the position of the core rod 2 on the conveying roller 501, and drive the second oil cylinder 707. The telescopic shaft end of the second oil cylinder 707 is recovered to make the two clamps 710 clamp the core rod 2 on the conveying roller 501 to complete the clamping operation. The function of the second motor 701, the screw rod 702 and the screw rod nut 704 is to realize the horizontal longitudinal conveyance of the clamp 710 with the core rod 2 to the top of the lower mold 6, and then drive the first oil cylinder 705 and the second oil cylinder 707 to realize the transportation of the core rod 2 into the lower mold 6.

[0038] As a specific embodiment of the present invention, in order to facilitate the pressing operation of the layer to be pressed 3 on the core rod 2 in the lower die 6, the die portion 9 includes an upper die 901 with a U-shaped shell structure matched with the lower die 6, the top of the upper die 901 is connected to the telescopic shaft end of the third oil cylinder 902, the lower guide tube 903 set on the top of the upper die 901 is matched with the upper guide rod 904, driving the third oil cylinder 902, and the upper die 901 is pressed downward with the lower die 6 to realize the pressing operation of the layer to be pressed 3 on the core rod 2.

[0039] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a carbon-carbon round tube in a near-net shape, characterized in that: The following steps are involved: Step A: soaking phenolic resin in pre-oxidized needle felt with one layer of carbon cloth and two layers of mesh or two layers of carbon cloth and three layers of mesh, the thickness of the pre-oxidized needle felt is 0.5-3mm, and the soaking time is 2-10h; Step B: The pre-oxidized needle felt soaked in phenolic resin is centrifugally drained at a speed of 0.5-5 rpm for 1-5 h. The residual amount of phenolic resin in the pre-oxidized needle felt is controlled at 50-80% and the density is controlled at 0.4-0.45 g / cm 3 ; Step C: The pre-oxidized needle felt prepared in step B is wound around the core rod (2) with 0.2-1 mm carbon filaments, and then evenly wound with 0.2-2 mm glass fiber tape using a winding machine to form a layer to be pressed (3). The fiber density before winding is controlled to be 0.4-0.45 g / cm 3 , the fiber density after winding is controlled to 0.45-0.52g / cm 3 ; Step D: Place the core rod (2) into the lower die (6), control the pressing pressure to 10-100 tons, control the compression amount to 2-5 mm, and control the fiber density after pressing to 0.55-0.7 g / cm 3 ; Step E: curing the pressed material in step D at high temperature, the temperature is controlled at 100-200°C, the time is controlled at 5-24h, and then demoulding operation, carbonization operation, impregnation and re-carbonization operation, high temperature treatment operation, machining operation, surface coating CVD operation are sequentially performed to obtain a carbon-carbon round tube; The preparation method adopts a preparation device comprising a lower mold (6) arranged on a transverse shift seat (1), wherein the lower mold (6) can horizontally hold a core rod (2), a pushing portion (4) is arranged on the transverse side of the transverse shift seat (1), a feeding portion (5) is arranged on the longitudinal side of the transverse shift seat (1), a top frame (8) is arranged above the feeding portion (5), and a clamping and transporting portion (7) and a pressing portion (9) are arranged between the top frame (8) and the transverse shift seat (1).

2. The method for preparing a carbon-carbon round tube in a near-net shape according to claim 1, characterized in that: The pushing part (4) comprises a guide rail (402) matched with a slider (401) at the bottom of the transverse shift seat (1); a horizontal plate (405) is arranged on the side of the transverse shift seat (1); racks (406) are arranged on the upper and lower surfaces of the horizontal plate (405); the racks (406) are respectively meshed with a driving gear (403) at the output shaft end of the first motor (404) and a driven gear (407) at the top of the support (408) for transmission.

3. A method for preparing a carbon-carbon round tube in a near-net shape according to claim 2, characterized in that: The feeding portion (5) comprises a support seat (502), and a conveying roller (501) is rotatably arranged at a horizontal and transverse interval on the top of the support seat (502).

4. A method for preparing a carbon-carbon round tube in near net shape according to claim 3, characterized in that: The clamping and transporting part (7) comprises a second motor (701), a screw rod (702) connected to the output shaft of the second motor (701) matches a screw rod nut (704) at the top of the support plate (703), and a lower end of a first oil cylinder (705) at the bottom of the support plate (703) is connected to a lifting plate (706).

5. A method for preparing a carbon-carbon round tube in a near-net shape according to claim 4, characterized in that: A second oil cylinder (707) is disposed at the bottom of the lifting plate (706); the lower portion of the second oil cylinder (707) is hinged to the top of the clamping plate (710) via a hinge seat (709); and a movable block (711) at one end of a connecting rod (708) hingedly disposed on the outer wall of the second oil cylinder (707) is movably disposed in an arc-shaped groove of the clamping plate (710).

6. A method for preparing a carbon-carbon round tube in a near-net shape according to claim 5, characterized in that: The die section (9) comprises an upper die (901) in a U-shaped shell structure matched with the lower die (6); the top of the upper die (901) is connected to the telescopic shaft end of the third oil cylinder (902); and a lower guide tube (903) provided at the top of the upper die (901) matches an upper guide rod (904).

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