In-mold reinforcement composite cylinder winding mold and method of use

Abstract

This invention proposes a winding mold and its method for using a composite material cylinder with internal reinforcing ribs, belonging to the field of carbon fiber reinforced composite material molding technology. It solves the problem that during demolding of composite material cylinders with internal circumferential reinforcing ribs, the axial movement of the mold interferes with the internal reinforcing ribs, making demolding difficult. It includes a mandrel, a mold assembly, a front end cap, and a rear end cap. The mold assembly is a rotating structure fixed to the mandrel. The front and rear end caps are fixed to the mandrel and respectively connected to the front and rear ends of the mold assembly. The mold assembly is a split structure, formed by assembling a first mold and a second mold. After assembly, the first and second molds form an annular groove distributed circumferentially at the assembly point. During demolding, the first and second molds do not interfere with the space within the annular groove. It is mainly used for manufacturing composite material cylinders with internal circumferential reinforcing ribs.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber reinforced composite material molding technology, and in particular relates to a winding mold for a composite material cylinder with internal reinforcing ribs and its usage method. Background Technology

[0002] Compared with traditional metal materials, carbon fiber composites have advantages such as high specific strength, specific modulus and specific stiffness, fatigue resistance, strong designability and corrosion resistance. The application of carbon fiber reinforced composites using long fiber winding molding technology is becoming more and more widespread, and it is very common to add reinforcing ribs to carbon fiber reinforced composites to strengthen local structures.

[0003] For molds containing composite material cylinders with internal circumferential reinforcing ribs, axial movement of the mold during demolding will interfere with the internal reinforcing ribs, making it impossible to demold directly from both sides axially, resulting in difficulty in demolding. Summary of the Invention

[0004] In view of this, in order to solve the problem that when demolding a composite material cylinder with internal circumferential reinforcing ribs, the axial movement of the mold interferes with the internal reinforcing ribs, making direct axial demolding from both sides impossible and causing mold demolding difficulties, this invention proposes a winding mold and method for using a composite material cylinder with internal reinforcing ribs. Using the internal reinforcing ribs as a dividing line, the mold is divided into two parts. The two parts are assembled into a whole mold with grooves that fit the shape of the reinforcing ribs. During demolding, the molds located on both sides of the reinforcing ribs are pulled out axially along the cylinder without interfering with the reinforcing ribs, making mold demolding convenient.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a winding mold for a composite material cylinder with internal reinforcing ribs, comprising a mandrel, a mold assembly, a front end cap, and a rear end cap, wherein the mold assembly is fixed on the mandrel and is a rotating structure, and the front end cap and the rear end cap are fixed on the mandrel and respectively fixed to the front and rear ends of the mold assembly;

[0006] The mold assembly is a split structure, formed by assembling a first mold and a second mold. After the first mold and the second mold are assembled, an annular groove distributed along the circumference will be formed at the assembly point. When the first mold and the second mold are demolded, they will not interfere with the space inside the annular groove.

[0007] Furthermore, the circumferential surface contour of the mold assembly is cylindrical on one side and tapered into a cylindrical shape on the other side, with the annular groove located in the cylindrical region.

[0008] Furthermore, the second mold is trumpet-shaped, comprising a wide opening side and a narrow opening side. The second mold is composed of a second mold side wall and a second mold bottom wall connected together, with the second mold bottom wall located on the narrow opening side of the second mold.

[0009] Furthermore, one side of the second mold sidewall is fitted with the first mold, and the other side is fitted with the bottom wall of the second mold. The bottom wall of the second mold is fixedly connected to the first mold, clamping and fixing the second mold sidewall to the first mold from the axial direction.

[0010] Furthermore, the second mold sidewall has a segmented structure, which is formed by multiple segments one and multiple segments two arranged and connected in an alternating manner along the circumference. The second mold bottom wall has a planar assembly structure with an opening in the center. The second mold bottom wall is formed by multiple assembly blocks one and multiple assembly blocks two arranged and connected in an alternating manner along the circumference in the same plane. The second mold can be demolded from its bottom area, and the components can be disassembled in sequence.

[0011] Furthermore, the second mold has an axial positioning surface three and a radial positioning surface four at the edge of the wide opening side, an axial positioning surface four on the bottom wall of the second mold, and a radial positioning surface five and a radial positioning surface six at the opening. The surface of the first mold is correspondingly provided with an axial positioning surface one, an axial positioning surface two, a radial positioning surface one, a radial positioning surface two, and a radial positioning surface three. When the first mold and the second mold are assembled, the axial positioning surface one and the axial positioning surface three are in contact with each other, the axial positioning surface two and the axial positioning surface four are located in the same plane, the radial positioning surface one and the radial positioning surface four are in contact with each other, the radial positioning surface two and the radial positioning surface five are in contact with each other, and the radial positioning surface three and the radial positioning surface six are in contact with each other, thus completing the axial and radial assembly positioning between the first mold and the second mold.

[0012] Furthermore, the first axial positioning surface is provided with a guide positioning groove, and the third axial positioning surface is provided with multiple guide positioning blocks, wherein the guide positioning groove and the guide positioning blocks are matched.

[0013] Furthermore, the arc length of the second segment that is attached to the bottom wall of the second mold is greater than the arc length of the other end, and the arc length of the first segment that is attached to the bottom wall of the second mold is less than the arc length of the other end. When demolding the second mold, the second segment is removed first and then the first segment is removed.

[0014] Furthermore, there are six segments, one-to-one correspondences between the first segment, the second segment, the first assembly block, and the second assembly block. The first segment is fixed to the first assembly block, and the second segment is fixed to the second assembly block.

[0015] A method for using a winding mold for a composite material cylinder with internal reinforcing ribs.

[0016] S1: Mold installation: The first mold and the second mold are sequentially inserted into the mandrel from both sides or from one side to form a mold assembly with an annular groove. The front end and the rear end are inserted into the mandrel from both sides and connected to the mold assembly and fixed to the mandrel to obtain a winding mold for a composite material cylinder with internal reinforcing ribs.

[0017] S2: Preparation of composite material cylinder with internal reinforcing ribs: The assembled winding mold is clamped onto the winding machine. First, the reinforcing ribs of the product are prepared in the annular groove area by using the annular winding method. Then, the product cylinder is prepared on the surface of the winding mold by using the annular winding method and the longitudinal winding method to obtain the composite material cylinder with internal reinforcing ribs.

[0018] S3: Demolding: Remove the front and rear end caps from both sides of the product along the mandrel, and then remove the mandrel, the first mold, and the second mold from the openings on both sides or one side of the product to demold the product.

[0019] Compared with the prior art, the beneficial effects of the winding mold and its method for using a composite material cylinder with internal reinforcing ribs described in this invention are:

[0020] 1. The present invention can produce composite material cylinders with internal circumferential ring-shaped reinforcing ribs using a demolding method, and the mold is easy to demold.

[0021] 2. The present invention designs one side of the mold as a split structure, and the mold part can be disassembled from the narrow outlet. It can use the demolding method to produce composite material cylinders with circumferential ring-shaped reinforcing ribs inside and a gradually narrowing opening on one side. It is especially suitable for demolding molds with asymmetrical structures.

[0022] 3. The present invention has multiple axial and radial positioning surfaces, which ensures accurate positioning between components.

[0023] 4. The present invention is provided with a guide positioning groove to assist in the assembly and disassembly of the segments, further improving the convenience of mold assembly and disassembly and the positioning accuracy between components. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a winding mold for a composite material cylinder with internal reinforcing ribs according to the present invention;

[0026] Figure 2 This is a front view of the mold assembly described in this invention;

[0027] Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle;

[0028] Figure 4 This is a schematic diagram of the structure of the second mold of the present invention. Figure 1 ;

[0029] Figure 5 This is a first exploded view of the mold assembly described in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the second mold sidewall and the second mold bottomwall of the present invention;

[0031] Figure 7 This is a right view of the side wall of the second mold and the bottom wall of the second mold of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the second mold of the present invention. Figure 2 ;

[0033] Figure 9 For the present invention Figure 8 A magnified view of a section at point B in the middle;

[0034] Figure 10 This is a front view of the first mold of the present invention;

[0035] Figure 11 For the present invention Figure 10 A magnified view of a section at point C;

[0036] Figure 12 For the present invention Figure 10 A magnified view of a section at point D;

[0037] Figure 13 This is a front view of the second mold of the present invention;

[0038] Figure 14 This is a schematic diagram of the structure of the first mold of the present invention. Figure 1 ;

[0039] Figure 15 This invention Figure 14 A magnified view of a section at point E in the middle;

[0040] Figure 16 Schematic diagram of the structure of the second mold of the present invention Figure 3 ;

[0041] Figure 17 This invention Figure 16 A magnified view of a section at point F in the middle;

[0042] Figure 18 This is a cross-sectional view of the first mold of the present invention;

[0043] Figure 19 This invention Figure 18 A magnified view of a section at point G in the middle;

[0044] Figure 20 A cross-sectional view of the second mold of the present invention;

[0045] In the diagram: 1-Mandrel; 2-Mold assembly; 3-Front end cap; 4-Rear end cap; 5-First mold; 6-Second mold; 7-Annular groove;

[0046] 61 - Second mold sidewall; 62 - Second mold bottom wall;

[0047] 611 - Lobe 1; 612 - Lobe 2; 621 - Assembly Block 1; 622 - Assembly Block 2; 623 - Opening;

[0048] 1A - Axial positioning surface one; 2A - Axial positioning surface two; 3A - Radial positioning surface one; 4A - Radial positioning surface two; 5A - Radial positioning surface three; 6A - Guide positioning groove;

[0049] 1B - Axial positioning surface three; 2B - Axial positioning surface four; 3B - Radial positioning surface four; 4B - Radial positioning surface five; 5B - Radial positioning surface six; 6B - Guide positioning block. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0051] I. Detailed Implementation Method 1, see [link / reference] Figure 1-20 This embodiment describes a winding mold for a composite material cylinder with internal reinforcing ribs, comprising a mandrel 1, a mold assembly 2, a front end cap 3, and a rear end cap 4. The mold assembly 2 is fixed on the mandrel 1 and is a rotating structure. The front end cap 3 and the rear end cap 4 are fixed on the mandrel 1 and are respectively fixed to the front and rear ends of the mold assembly 2.

[0052] The mold assembly 2 is a split structure, which is formed by assembling the first mold 5 and the second mold 6. After the first mold 5 and the second mold 6 are assembled, an annular groove 7 distributed along the circumference will be formed at the assembly point. When the first mold 5 and the second mold 6 are demolded, they will not interfere with the space inside the annular groove 7.

[0053] The mold assembly 2 of this invention adopts a split structure. This design allows the mold to separate smoothly during demolding without interfering with the space within the annular groove 7. This design is particularly suitable for composite material cylinders with complex internal reinforcing rib structures, effectively preventing damage to the composite material structure during demolding.

[0054] The annular groove 7 formed after the first mold 5 and the second mold 6 are assembled provides space for the winding preparation of the inner reinforcing ribs. This design not only simplifies the manufacturing and assembly process of the molds, but also ensures that the composite material is evenly distributed during the winding process, avoiding uneven material distribution or defects caused by complex structures.

[0055] The front end cap 3 and the rear end cap 4 enhance the overall stability of the mold from both sides and provide better support during the winding process, preventing the mold from deforming or shifting, thereby improving the molding quality. The mandrel 1 of this invention can be processed into a structure with different shaft diameters to axially limit the components.

[0056] The mold assembly described in this application has a cylindrical shape on one side of its circumferential surface contour and a tapering cylindrical shape on the other side, with the annular groove 7 located in the cylindrical region. This design adapts to the specific structural requirements of products with different shapes.

[0057] The second mold 6 in this application is trumpet-shaped, comprising a wide opening side and a narrow opening side. The second mold 6 is composed of a second mold side wall 61 and a second mold bottom wall 62 connected together, with the second mold bottom wall 62 located on the narrow opening side of the second mold 6. The second mold 6 is designed in a trumpet shape to adapt to the product shape, and the bottom surface increases the contact area with the end cap, improving the stability of the end cap clamping and fixing.

[0058] In this application, one side of the second mold sidewall 61 is attached to the first mold 5, and the other side is attached to the bottom wall 62 of the second mold. The bottom wall 62 of the second mold is fixedly connected to the first mold 5, and the second mold sidewall 61 and the first mold 5 are clamped and fixed from the axial direction.

[0059] The second mold sidewall 61 of this application has a segmented structure. The second mold sidewall 61 is formed by multiple segments 1 611 and multiple segments 2 612 arranged and connected in a staggered manner along the circumference. The second mold bottom wall 62 has a planar assembly structure with an opening 623 in the center. The second mold bottom wall 62 is formed by multiple assembly blocks 1 621 and multiple assembly blocks 2 622 arranged in a staggered manner along the circumference in the same plane. The second mold 6 can be demolded from its bottom area, and the components can be disassembled in sequence.

[0060] For a component that shrinks on one side and has an annular reinforcing rib inside, the annular reinforcing rib provides unidirectional axial demolding restriction for the mold. Combined with the shrinkage opening, it provides complete axial restriction for the mold in both directions. If the mold between the reinforcing rib and the shrinkage opening is a single structure, it cannot be demolded. Therefore, this invention splits the mold at this location into multiple parts. Some mold parts are removed sequentially from the shrinkage opening, gradually reducing the total volume of the mold in this area. When the total volume of the mold in this area is reduced to the point where it can pass through the annular reinforcing rib without interference, the remaining mold is then removed axially from the non-shrinking side of the product, thus achieving smooth demolding of the component product that shrinks on one side and has an annular reinforcing rib inside.

[0061] The second mold 6 of this application has an axial positioning surface 1B and a radial positioning surface 3B at the edge of the wide side. The bottom wall 62 of the second mold has an axial positioning surface 2B. The opening 623 has a radial positioning surface 4B and a radial positioning surface 5B. The surface of the first mold 5 has a corresponding axial positioning surface 1A, an axial positioning surface 2A, a radial positioning surface 3A, a radial positioning surface 4A, and a radial positioning surface 5A. When the first mold 5 and the second mold 6 are assembled, the axial positioning surface 1A and the axial positioning surface 3B are in contact with each other. The axial positioning surface 2A and the axial positioning surface 4B are located in the same plane. The radial positioning surface 1A and the radial positioning surface 4B are in contact with each other. The radial positioning surface 2A and the radial positioning surface 5B are in contact with each other. The radial positioning surface 3A and the radial positioning surface 6B are in contact with each other, thus completing the axial and radial assembly positioning between the first mold 5 and the second mold 6.

[0062] This invention provides multiple pairs of mating axial and radial positioning surfaces on the first mold 5 and the second mold 6. These surfaces precisely control the mold's position along its axial direction, ensuring alignment of all parts of the mold in the radial direction. This prevents axial misalignment and radial eccentricity caused by assembly errors, guaranteeing the overall dimensional accuracy of the mold and thus ensuring the geometric accuracy and symmetry of the molded product. During winding or molding, the mold may be subjected to axial forces. The axial positioning surfaces effectively prevent displacement of the mold along its axial direction, ensuring the stability of the molding process. The radial positioning surfaces enhance the mold's support in the radial direction, preventing deformation under stress and improving the overall rigidity of the mold.

[0063] The axial positioning surface 1A described in this application is provided with a guide positioning groove 6A, and the axial positioning surface 1B is provided with multiple guide positioning blocks 6B. The guide positioning groove 6A and the guide positioning blocks 6B are fitted together. The guide positioning groove 6A is an annular groove, and its cooperation with the guide positioning blocks 6B can further improve the accuracy and convenience of positioning during mold assembly. This structure has the advantages of accurate radial positioning, no interference in the circumferential direction, and low processing cost.

[0064] In this application, the arc length of the second segment 612 that is attached to the bottom wall 62 of the second mold is greater than the arc length of the other end, and the arc length of the first segment 611 that is attached to the bottom wall 62 of the second mold is less than the arc length of the other end. When the second mold 6 is demolded, the second segment 612 is removed first and then the first segment 611 is removed. When the segments are removed, axial and radial movement occurs. If all segments are shrinking structures in the same direction as the product's shrinkage, interference will occur between the segments, making removal impossible. Therefore, the segment shape is designed so that segment 2 612 is designed to diverge in the product's shrinkage direction. Since the product's shape is trumpet-shaped, segment 1 611's shape must be opposite to the diverging direction of segment 2 612. Only when the two are combined can they form a trumpet-shaped profile. During assembly, segment 1 611 is positioned by axial and radial positioning surfaces and guide positioning grooves. Segment 2 is then positioned by segment 1, which has already been positioned. After positioning, each segment is secured with screws. This structure ensures the end face positioning accuracy and reduces the space occupied by the positioning structure. When removing, segment 2 612 is removed first. After removing segment 2 612, some space will be created between segment 1 611, allowing for smooth removal.

[0065] The first segment 611, the second segment 612, the first assembly block 621, and the second assembly block 622 described in this application are all six in number and correspond one-to-one. The first segment 611 is fixed to the first assembly block 621, and the second segment 612 is fixed to the second assembly block 622. The fixing method of this invention is bolts or other mechanical means of fixing.

[0066] This embodiment describes the method of using a winding mold for a composite material cylinder with internal reinforcing ribs, as described above:

[0067] S1: Install the mold: Insert the first mold 5 and the second mold 6 into the mandrel 1 from both sides or from one side to assemble and fix them, forming a mold assembly 2 with an annular groove 7. Insert the front end cap 3 and the rear end cap 4 into the mandrel 1 from both sides to connect with the mold assembly 2 and fix them to the mandrel 1 to obtain a winding mold for a composite material cylinder with internal reinforcing ribs.

[0068] S2: Preparation of composite material cylinder with internal reinforcing ribs: The assembled winding mold is clamped onto the winding machine. First, the reinforcing ribs of the product are prepared in the area of ​​the annular groove 7 using the annular winding method. Then, the product cylinder is prepared on the surface of the winding mold using the annular winding method and the longitudinal winding method to obtain the composite material cylinder with internal reinforcing ribs.

[0069] S3: Demolding: Remove the front end cap 3 and the rear end cap 4 from both sides of the product along the mandrel 1, and then remove the mandrel 1, the first mold 5 and the second mold 6 from the openings on both sides or one side of the product to achieve product demolding.

[0070] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A winding mold for a composite material cylinder with internal reinforcing ribs, characterized in that: It includes a mandrel (1), a mold assembly (2), a front end (3) and a rear end (4). The mold assembly (2) is fixed on the mandrel (1) and is a rotating structure. The front end (3) and the rear end (4) are fixed on the mandrel (1) and are respectively fixed to the front and rear ends of the mold assembly (2). The mold assembly (2) is a split structure, which is formed by assembling the first mold (5) and the second mold (6). After the first mold (5) and the second mold (6) are assembled, an annular groove (7) distributed along the circumference will be formed at the assembly point. When the first mold (5) and the second mold (6) are demolded, they will not interfere with the space inside the annular groove (7). The mold assembly (2) has a cylindrical shape on one side of its circumferential surface contour and a gradually narrowing cylindrical shape on the other side, with the annular groove (7) located in the cylindrical area; The second mold (6) is trumpet-shaped, and it includes a wide mouth side and a narrow mouth side. The second mold (6) is composed of a second mold side wall (61) and a second mold bottom wall (62) connected together, and the second mold bottom wall (62) is located on the narrow mouth side of the second mold (6). One side of the second mold sidewall (61) is attached to the first mold (5), and the other side is attached to the bottom wall (62) of the second mold. The bottom wall (62) of the second mold is fixedly connected to the first mold (5), and the second mold sidewall (61) and the first mold (5) are clamped and fixed from the axial direction. The second mold sidewall (61) is a segmented structure. The second mold sidewall (61) is formed by multiple segments one (611) and multiple segments two (612) arranged and connected in a staggered manner along the circumference. The second mold bottom wall (62) is a planar assembly structure with an opening (623) in the center. The second mold bottom wall (62) is formed by multiple assembly blocks one (621) and multiple assembly blocks two (622) arranged and connected in a staggered manner along the circumference in the same plane. The second mold (6) can be demolded from its bottom area, and each component can be disassembled in sequence. The second mold (6) has an axial positioning surface three (1B) and a radial positioning surface four (3B) at the edge of the wide opening side. The bottom wall (62) of the second mold has an axial positioning surface four (2B). The opening (623) has a radial positioning surface five (4B) and a radial positioning surface six (5B). The surface of the first mold (5) is correspondingly provided with an axial positioning surface one (1A), an axial positioning surface two (2A), a radial positioning surface one (3A), a radial positioning surface two (4A), and a radial positioning surface three (5A). (5) When assembling the second mold (6), the axial positioning surface one (1A) is in contact with the axial positioning surface three (1B), the axial positioning surface two (2A) and the axial positioning surface four (2B) are in the same plane, the radial positioning surface one (3A) is in contact with the radial positioning surface four (3B), the radial positioning surface two (4A) is in contact with the radial positioning surface five (4B), and the radial positioning surface three (5A) is in contact with the radial positioning surface six (5B), thus completing the axial and radial assembly positioning between the first mold (5) and the second mold (6). The axial positioning surface one (1A) is provided with a guide positioning groove (6A), which is an annular groove. The axial positioning surface three (1B) is provided with multiple guide positioning blocks (6B), and the guide positioning groove (6A) and the guide positioning blocks (6B) are matched.

2. A winding mould for in-mould reinforced composite cylinders according to claim 1, characterized in that: The arc length of the second segment (612) that is attached to the bottom wall (62) of the second mold is greater than the arc length of the other end. The arc length of the first segment (611) that is attached to the bottom wall (62) of the second mold is less than the arc length of the other end. When the second mold (6) is demolded, the second segment (612) is removed first and then the first segment (611) is removed.

3. A winding mould for in-mould reinforced composite cylinders according to claim 2, characterized in that: There are six segments (611), six segments (612), six assembly blocks (621), and six assembly blocks (622), and each segment corresponds to one another. Segment 1 (611) is fixed to assembly block 1 (621), and segment 2 (612) is fixed to assembly block 2 (622).

Images