Internal expanding round device and processing method of carbon fiber composite material conical part

Abstract

The application discloses an inner expanding device and a processing technology method of a carbon fiber composite material conical part, and belongs to the technical field of carbon fiber composite material manufacturing. The inner expanding device comprises an expanding tool and a mandrel. The expanding tool is sleeved in a to-be-processed tubular carbon fiber composite material in use. The expanding tool is sleeved outside the mandrel. The expanding tool comprises a flange plate, a stepped sleeve and a plurality of expanding blocks. The flange plate is sleeved outside the mandrel. The stepped sleeve comprises a tubular portion fixedly connected with the bottom of the flange plate and a plurality of convex portions distributed radially on the circumferential side of the tubular portion. The tubular portion and the flange plate are coaxially sleeved outside the mandrel. The plurality of expanding blocks are arranged at the end portions of the plurality of convex portions. The application is applied to the manufacturing of the carbon fiber composite material conical part, solves the technical problems of clamping difficulty, easy deformation and great processing difficulty of the existing inner expanding device in application, and has the characteristics of conveniently overall correcting the part from the inside and guaranteeing the product quality.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber composite material manufacturing technology, and particularly relates to an internal expansion device and a processing method for carbon fiber composite conical parts. Background Technology

[0002] With the continuous growth of my country's industrial level, factories are demanding increasingly higher precision from their workpieces. The structure of a carbon fiber composite conical part is as follows: Figure 1 As shown, it includes a small diameter section, a large diameter section, and a conical section connecting the small diameter section and the large diameter section. Therefore, in order to process the cylindrical carbon fiber composite material into the conical part with the above structure, it is necessary to perform an internal diameter expansion operation on the carbon fiber composite material.

[0003] However, carbon fiber composite conical parts are characterized by thin walls, which makes clamping difficult, deformation easy, and machining difficult when expanding and rounding their inner diameter. In addition, due to the structural characteristics of carbon fiber composite conical parts, circumferential edges are prone to appear when expanding and rounding their inner diameter, which affects the manufacturing quality and production efficiency of the parts. Summary of the Invention

[0004] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0005] This invention proposes an internal expansion device and a processing method for carbon fiber composite conical parts. It solves the technical problems of existing internal expansion devices when expanding and rounding the inner diameter of carbon fiber composite materials, such as difficulty in clamping, easy deformation, and high processing difficulty. It has the characteristics of being able to easily round the parts as a whole from the inside and ensuring product quality.

[0006] This invention discloses an internal expansion and rounding device for expanding and / or rounding the inner diameter of a cylindrical carbon fiber composite material to produce a conical carbon fiber composite part. The device includes an expansion tool and a mandrel. The expansion tool is fitted inside the cylindrical carbon fiber composite material to be processed. The expansion tool is fitted outside the mandrel. The expansion tool further includes a flange, a stepped sleeve, and multiple expansion blocks. The flange is fitted outside the mandrel. The stepped sleeve includes a cylindrical portion fixedly connected to the bottom of the flange, and multiple protrusions radially distributed around the cylindrical portion. The cylindrical portion and the flange are coaxially fitted outside the mandrel. The multiple expansion blocks are disposed at the ends of the multiple protrusions, and the arrangement of the multiple expansion blocks forms a discontinuous annular shape with a circumferential periphery composed of multiple arc segments, and a continuous columnar shape with an axial periphery composed of multiple cylinders and frustums.

[0007] In some embodiments, the positioning element includes a pin hole and a positioning pin. The pin hole includes a first pin hole formed on the protrusion and a second pin hole formed on the expansion block. When the first pin hole and the second pin hole coincide, the positioning pin passes through the first pin hole and the second pin hole to fix the protrusion and the expansion block.

[0008] In some embodiments, the expansion block includes an arcuate portion and a connecting portion; the outer surface of the arcuate portion is connected to the inner surface of the cylindrical carbon fiber composite material and / or the conical part of the carbon fiber composite material; the connecting portion is fixedly connected to the inner surface of the arcuate portion, and the connecting portion is connected to the protrusion through the positioning member.

[0009] In some embodiments, the protrusion is cylindrical, and the connecting portion is partially sleeved inside the protrusion.

[0010] In some embodiments, the bulging tool further includes screws that can adjustably and securely connect the protrusion to the arcuate surface.

[0011] In some embodiments, the bulging tool further includes a baffle plate mounted on the end face with the larger diameter of the bulging tool.

[0012] In some embodiments, a bracket is also included for supporting the mandrel, the mandrel being rotatably connected to the bracket.

[0013] In some embodiments, the mandrel is connected to the bulging tool via a double-ended round key.

[0014] Another aspect of the present invention discloses a processing method for a carbon fiber composite conical part using the internal expansion device described in any of the above technical solutions, comprising:

[0015] Precision machining of the bulging tooling step: The plurality of bulging blocks are precision machined until the size of the envelope circle formed by the plurality of bulging blocks is compatible with the inner size of the carbon fiber composite conical part to be machined;

[0016] Steps for installing the tubular carbon fiber composite material: Before fixing the plurality of expansion blocks to the plurality of protrusions, the tubular carbon fiber composite material to be processed is installed on the plurality of expansion blocks by moving the plurality of expansion blocks toward the center of the stepped sleeve;

[0017] Processing steps for carbon fiber composite conical parts: Move the plurality of expansion blocks away from the center of the stepped sleeve until the size of the envelope circle formed by the plurality of expansion blocks matches the inner size of the carbon fiber composite conical part to be processed; fix the plurality of expansion blocks and the plurality of protrusions; and expand and / or round the inner diameter of the cylindrical carbon fiber composite material to form the carbon fiber composite conical part.

[0018] In some embodiments, the step of installing the tubular carbon fiber composite material is included prior to the step of installing the tubular carbon fiber composite material.

[0019] The steps for assembling the internal expansion device are as follows: the cylindrical part of the flange and the stepped sleeve is fitted onto the outside of the mandrel, and the flange and the mandrel are fixedly connected.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention discloses an internal expansion device that ensures the integrity of the arc-shaped contact surface of the expansion block throughout the circumference, reducing the difficulty of product assembly. It allows for convenient overall rounding of parts from the inside without causing circumferential edges. This solves the problems of clamping difficulties, easy deformation, and high processing difficulty when expanding and rounding the inner diameter of thin-walled parts, greatly improving the accuracy and work efficiency of the product. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of a carbon fiber composite conical part.

[0024] Figure 2 This is a schematic diagram of the internal expansion device provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the bulging tool provided in an embodiment of the present invention;

[0026] Figure 4 This is an exploded perspective view of the bulging tooling provided in an embodiment of the present invention;

[0027] Figure 5 This is an exploded plan view of the bulging tooling provided in an embodiment of the present invention;

[0028] Figure 6 This is an exploded cross-sectional view of the stepped sleeve provided in an embodiment of the present invention;

[0029] Figure 7This is a schematic diagram of the block layout provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the connection structure of the positioning element provided in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the overall structure of the internal expansion device provided in an embodiment of the present invention;

[0032] Figure 10 This is another overall structural schematic diagram of the internal expansion device provided in an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the connection structure between the mandrel and the bulging tool provided in an embodiment of the present invention;

[0034] Figure descriptions: 1. Expansion tooling; 11. Flange; 12. Stepped sleeve; 121. Cylindrical part; 122. Protrusion; 13. Expansion block; 131. Arc-shaped part; 132. Connecting part; 14. Positioning element; 141. First pin hole; 142. Second pin hole; 143. Positioning pin; 15. Screw; 16. Baffle; 2. Mandrel; 3. Bracket; 4. Double-ended round key. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0036] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0037] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," "an," "the," and similar words used in this invention do not indicate quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," "coupled," and similar words used in this invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A plurality" in this invention refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist; for example, "A and / or B" can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the objects before and after it are in an "or" relationship.

[0039] This invention provides an internal expansion and rounding device for expanding and / or rounding the inner diameter of a cylindrical carbon fiber composite material to produce a conical part of the carbon fiber composite material. Figure 2 This is a schematic diagram of the internal expansion device according to an embodiment of the present invention. (Reference) Figure 2 As shown, the device includes at least an expansion tool 1 and a mandrel 2; the expansion tool 1 is fitted inside the cylindrical carbon fiber composite material to be processed during use; the expansion tool 1 is fitted outside the mandrel 2; as... Figure 3 As shown, the bulging fixture 1 further includes a flange 11, a stepped sleeve 12, and multiple bulging blocks 13; the flange 11 is sleeved around the mandrel 2; as... Figure 4 , 5 As shown in Figure 6, the stepped sleeve 12 includes a cylindrical portion 121 fixedly connected to the bottom of the flange 11, and a plurality of protrusions 122 radially distributed around the cylindrical portion 121. The cylindrical portion 121 and the flange 11 are coaxially sleeved on the mandrel 2. A plurality of expansion blocks 13 are disposed at the ends of the plurality of protrusions 122, and the arrangement of the plurality of expansion blocks 13 forms a... Figure 3 The circumferential outer perimeter shown is a discontinuous ring composed of multiple arc segments, and Figure 7 The axial periphery shown is a continuous columnar shape composed of multiple segments of cylinders and frustums. This internal expansion device ensures the integrity of the arc-shaped contact surface of the expansion block 13 throughout the circumference, reducing product assembly difficulty. It facilitates overall rounding of the part from the inside without causing circumferential sharp edges. This solves the problems of clamping difficulties, easy deformation, and high processing difficulty when expanding and rounding the inner diameter of thin-walled parts, greatly improving the product's accuracy and work efficiency. Specifically, when multiple expansion blocks 13 are movably connected to multiple protrusions 122, the cylindrical carbon fiber composite material is sleeved outside the expansion tooling 1; when multiple expansion blocks 13 are fixedly connected to multiple protrusions 122 via positioning elements 14, the outer diameter of the multiple expansion blocks 13 is machined until the size of the envelope circle formed by the multiple expansion blocks 13 is the same as the inner size of the carbon fiber composite conical part, and the inner diameter of the cylindrical carbon fiber composite material is expanded and / or rounded to produce the carbon fiber composite conical part. In one embodiment of the invention, as... Figure 8 As shown, the positioning member 14 includes a pin hole and a positioning pin 143. The pin hole includes a first pin hole 141 formed on the protrusion 122 and a second pin hole 142 formed on the expansion block 13. When the first pin hole 141 and the second pin hole 142 coincide, the positioning pin 143 passes through the first pin hole 141 and the second pin hole 142 to fix the protrusion 122 and the expansion block 13. To further ensure the stability of the connection, an internal hexagon screw 15 is also included to further fix the connection between the protrusion 122 and the expansion block 13 after the positioning member 14 is used to position and connect the protrusion 122 and the expansion block 13, preventing the expansion block 13 from loosening.

[0040] It should be noted that before the inner diameter of the cylindrical carbon fiber composite material to be processed is enlarged and / or rounded, the bulging tool 1 of the present invention needs to be precision machined on multiple bulging blocks 13. Specifically, before precision machining, the multiple bulging blocks 13 are moved to the tightest state. When the second pin hole 142 on the bulging block 13 is completely overlapped with the first pin hole 141 on the protrusion 122 of the stepped sleeve 12 (the pin holes on the bulging block 13 and the stepped sleeve 12 are pre-machined), the positioning pin 143 is inserted through the first pin hole 141 and the second pin hole 142 to achieve the function of fixing and connecting the protrusion 122 and the bulging block 13 and positioning and connecting the protrusion 122 and the bulging block 13. Before machining, the multiple bulging blocks 13 have a margin in the outer diameter direction. In this state, the outer diameter is machined to the drawing size (i.e., the size of the envelope circle formed by the multiple bulging blocks 13 is the same as the inner size of the carbon fiber composite conical part). Specifically, due to the layout of the multiple bulging blocks 13 forming a Figure 3 The circumferential outer perimeter shown is a discontinuous ring composed of multiple arc segments, and Figure 7The axial periphery shown is a continuous columnar shape composed of multiple segments of cylinders and frustums. Therefore, in the axial direction, multiple expansion blocks 13 form several envelope circles of different diameters (the dimensions of the envelope circles at different positions are the same as the inner dimensions of the corresponding positions of the carbon fiber composite conical parts), thereby achieving the purpose of overall roundness correction. By setting the positioning element 14, this invention ensures that the structure formed by the arrangement of multiple expansion blocks 13 after finishing is consistent with the structure formed by the arrangement of multiple expansion blocks 13 when processing the cylindrical carbon fiber composite material. Moreover, the structure formed by the arrangement of multiple expansion blocks 13 after finishing is processed according to the dimensions of the carbon fiber composite conical parts. Therefore, the accuracy of part processing is guaranteed, and the arc-shaped contact surface of the expansion blocks 13 also ensures the integrity of the entire circumference, reducing the difficulty of product assembly.

[0041] To improve the stability and convenience of the connection, the expansion block 13 includes an arcuate portion 131 and a connecting portion 132. The outer surface of the arcuate portion 131 is connected to the inner surface of the cylindrical carbon fiber composite material and / or the conical carbon fiber composite material part. The connecting portion 132 is fixedly connected to the inner surface of the arcuate portion 131 and is connected to the protrusion 122 through a positioning member 14. Optionally, the protrusion 122 is cylindrical, and the connecting portion 132 is partially sleeved inside the protrusion 122. The first pin hole 141 is opened on the side of the protrusion 122 of the stepped sleeve 12 and extends along the diameter direction of the protrusion 122 of the stepped sleeve 12. The second pin hole 142 is opened on the side of the connecting portion 132 of the expansion block 13. Optionally, the connecting portion 132 of the expansion block 13 is a cylindrical structure, and the protrusion 122 of the stepped sleeve 12 is a cylindrical structure, which facilitates the connection and disassembly of the two. Furthermore, the cylindrical portion 121 of the stepped sleeve 12 has an outer square and an inner circular structure. This facilitates the fitting of the cylindrical portion 121 of the stepped sleeve 12 onto the mandrel 2, and also facilitates the fixed connection between the protrusion 122 of the stepped sleeve 12 and the cylindrical portion 121. Specifically, the protrusion 122 of the stepped sleeve 12 and the cylindrical portion 121 of the stepped sleeve 12 can be fixedly connected by welding. Optionally, there are four protrusions 122 and four expansion blocks 13 in the stepped sleeve 12. Furthermore, the four protrusions 122 of the stepped sleeve 12 are radially and evenly distributed around the cylindrical portion 121.

[0042] In order to facilitate the movement of the expansion block 13 toward and away from the center of the stepped sleeve 12, while ensuring the connection between the expansion block 13 and the stepped sleeve 12 and ensuring the integrity of the device, the expansion tool 1 also includes an adjustable screw 15 that fixes the protrusion 122 and the arc surface 131. By tightening and loosening the screw 15, the expansion block 13 is moved toward and away from the center of the stepped sleeve 12. That is, the radial contraction movement of the expansion block 13 is achieved by the movement of the screw 15.

[0043] To limit axial movement during the expansion process of the part, the expansion fixture 1 also includes a baffle 16 installed on the larger diameter end face of the expansion fixture 1. Since the carbon fiber composite conical part is fitted onto the outer circle of the expansion fixture 1, axial movement is likely to occur during the expansion process. The baffle 16, installed on the larger end face of the expansion fixture 1 by bolts, can limit the axial movement of the part during the expansion process.

[0044] like Figure 9 , 10 As shown, it also includes a bracket 3 for supporting the mandrel 2. The mandrel 2 is rotatably connected to the bracket 3. The bracket 3 is composed of a frame (welded from channel steel) and a U-shaped support. The function of the bracket 3 is to support the rotation of the mandrel 2 and the expansion tool 1. To accommodate the simultaneous processing of different parts, optionally, at least one expansion tool 1 is fitted onto the mandrel 2, but it can also be two, three, etc. Figure 11 As shown, the mandrel 2 and the expansion fixture 1 are connected by a double-ended key 4 to prevent the expansion fixture 1 from rotating during operation. Furthermore, the flange 11 is sleeved on the mandrel 2, and the expansion fixture 1 is locked onto the mandrel 2 by screws 15 to ensure the tightness of the connection.

[0045] The working principle of the internal expansion device described in one embodiment of the present invention is as follows: First, the flange 11 locks the expansion fixture 1 onto the mandrel 2 using hexagon socket head cap screws 15M12. Then, the locating pin 143 is pulled out, and the four expansion blocks 13 are simultaneously moved towards the center of the stepped sleeve 12, facilitating the installation of composite material parts onto the four expansion blocks 13. The movement of the parts is restricted by the baffle 16. The four expansion blocks 13 are simultaneously moved outwards using hexagon socket head cap screws 15M12, causing the second pin hole 142 on the expansion block 13 to coincide with the first pin hole 141 on the stepped sleeve 12. Simultaneously, the locating pin 143 is installed as follows: Figure 8 This achieves the positioning function, and then the expansion block 13 and the stepped sleeve 12 are locked with 15M8×30 ​​socket head cap screws to prevent the expansion block 13 from loosening. The final state of this device is guaranteed by lathe machining, with a smooth transition at the connection between the straight section and the tapered section, so that the part will not have circumferential edges.

[0046] Another aspect of the present invention discloses a processing method for carbon fiber composite conical parts using an internal expansion device employing any of the above-mentioned technical solutions, specifically including:

[0047] Precision machining of the bulging tooling step 1: Precision machining of multiple bulging blocks 13 until the size of the envelope circle formed by the multiple bulging blocks 13 matches the inner size of the carbon fiber composite conical part to be machined;

[0048] Steps for installing the tubular carbon fiber composite material: Before fixing the multiple expansion blocks 13 and the multiple protrusions 122, the tubular carbon fiber composite material to be processed is installed on the multiple expansion blocks 13 by moving the multiple expansion blocks 13 toward the center of the stepped sleeve 12.

[0049] Processing steps for carbon fiber composite conical parts: Move multiple expansion blocks 13 away from the center of the stepped sleeve 12 until the size of the envelope circle formed by the multiple expansion blocks 13 matches the inner size of the carbon fiber composite conical part to be processed; fix the multiple expansion blocks 13 and multiple protrusions 122; expand the inner diameter and / or round the cylindrical carbon fiber composite material to form a carbon fiber composite conical part.

[0050] Furthermore, the process includes steps prior to installing the tubular carbon fiber composite material.

[0051] Steps for assembling the internal expansion device: Fit the cylindrical part 121 of the flange 11 and the stepped sleeve 12 onto the outside of the mandrel 2, and fix the flange 11 and the mandrel 2.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An internal bulging and rounding device for expanding the inner diameter and / or rounding a cylindrical carbon fiber composite material to produce a conical part of the carbon fiber composite material, characterized in that, include: An expansion tooling, which is used to be fitted inside the cylindrical carbon fiber composite material to be processed; The mandrel, and the bulging tooling is sleeved on the outside of the mandrel; The bulging tooling further includes: A flange, which is fitted over the mandrel; A stepped sleeve, the stepped sleeve including a cylindrical part fixedly connected to the bottom of the flange, and a plurality of protrusions radially distributed around the cylindrical part, the cylindrical part and the flange being coaxially sleeved on the outside of the mandrel; Multiple expansion blocks are disposed at the ends of the multiple protrusions, and the arrangement of the multiple expansion blocks forms a discontinuous annular shape with multiple segments of circular arcs on the circumferential periphery and a continuous columnar shape with multiple segments of cylinders and frustums on the axial periphery. Positioning element, the positioning element comprising: The pin hole includes a first pin hole formed on the protrusion and a second pin hole formed on the expansion block; A positioning pin, when the first pin hole coincides with the second pin hole, the positioning pin passes through the first pin hole and the second pin hole to fix the protrusion and the expansion block; Before enlarging and / or rounding the inner diameter of the cylindrical carbon fiber composite material to be processed, multiple expansion blocks need to be precision machined. Before precision machining, multiple expansion blocks are moved to the tightest state. When the second pin hole on the expansion block is completely aligned with the first pin hole on the protrusion of the stepped sleeve, the positioning pin is inserted through the first pin hole and the second pin hole. In this state, the outer diameter of multiple expansion blocks is machined to the dimensions shown in the drawing.

2. The internal expansion device according to claim 1, characterized in that, The bulge includes: The curved surface, the outer surface of which is connected to the inner surface of the cylindrical carbon fiber composite material and / or the conical part of the carbon fiber composite material; The connecting part is fixedly connected to the inner surface of the arc-shaped part, and the connecting part is connected to the protrusion through the positioning member.

3. The internal expansion device according to claim 2, characterized in that, The protrusion is cylindrical, and the connecting portion is partially fitted inside the protrusion.

4. The internal expansion device according to claim 2, characterized in that, The bulging tool also includes screws that can adjust and fix the protrusion to the arcuate surface.

5. The internal expansion device according to claim 1, characterized in that, The bulging tool also includes a baffle plate installed on the end face with the larger diameter of the bulging tool.

6. The internal expansion device according to claim 1, characterized in that, It also includes a bracket for supporting the mandrel, the mandrel being rotatably connected to the bracket.

7. The internal expansion device according to claim 1, characterized in that, The mandrel is connected to the bulging tool via a double-ended round key.

8. A method for processing carbon fiber composite conical parts using the internal expansion device according to any one of claims 1-7, characterized in that, include: Precision machining of the bulging tooling step: The plurality of bulging blocks are precision machined until the size of the envelope circle formed by the plurality of bulging blocks is compatible with the inner size of the carbon fiber composite conical part to be machined; Steps for installing the tubular carbon fiber composite material: Before fixing the plurality of expansion blocks to the plurality of protrusions, the tubular carbon fiber composite material to be processed is installed on the plurality of expansion blocks by moving the plurality of expansion blocks toward the center of the stepped sleeve; Processing steps for carbon fiber composite conical parts: Move the plurality of expansion blocks away from the center of the stepped sleeve until the size of the envelope circle formed by the plurality of expansion blocks matches the inner size of the carbon fiber composite conical part to be processed; fix the plurality of expansion blocks and the plurality of protrusions; and expand and / or round the inner diameter of the cylindrical carbon fiber composite material to form the carbon fiber composite conical part.

9. The processing method for the carbon fiber composite conical part according to claim 8, characterized in that, The process includes steps prior to the installation of the tubular carbon fiber composite material. The steps for assembling the internal expansion device are as follows: the cylindrical part of the flange and the stepped sleeve is fitted onto the outside of the mandrel, and the flange and the mandrel are fixedly connected.

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