Composite core mold and process method thereof

Abstract

The composite core mold comprises an inner lining layer, a metal reinforcing layer and an outer covering layer which are sequentially connected from inside to outside, the axial length of the metal reinforcing layer is smaller than the axial length of the inner lining layer and the axial length of the outer covering layer, and sealing layers are arranged on the two axial end faces of the metal reinforcing layer respectively. The inner surface of the sealing layer is connected with the outer surface of the lining layer, the outer surface of the sealing layer is connected with the inner surface of the outer covering layer, and the metal reinforcing layer continuously stretches across the bearing heavy load area. By adding the metal reinforcing layer with low cost and high bending modulus between the two fiber layers, compared with a traditional pure fiber core mold, the core mold has the advantages that the bending modulus is higher, the cost is low, the bearing limit is larger, and the weight is lighter and the transportation is easier under the condition of the same bearing performance under the same bearing requirement; meanwhile, the sealing layer is arranged to prevent dissimilar metal pollution, and the winding quality of foil products is guaranteed; by ensuring the roundness of the metal reinforcing layer, the processing efficiency of the outer covering layer is improved, and the process difficulty is reduced.

Description

Technical Field

[0001] The invention relates to a composite core mold and a process method thereof, belonging to the technical field of fiber composite material winding molding. Background Art

[0002] Composite material packaging core molds play an extremely important role in the storage and transportation of foil materials, especially in the packaging and transportation of thin materials such as copper foil, aluminum foil, and carbon foil. It provides effective support and protection to solve the deformation and damage problems of packaged materials during transportation. As a tooling fixture, the core mold can securely fix the packaged materials and protect them from external forces, thereby ensuring that the foil products maintain their quality and shape during storage and transportation. However, with the development of science and technology and the improvement of production processes, the requirements for core molds are becoming higher and higher. In particular, the contradiction between the weight of the material and the carrying capacity of the packaging core mold has become a difficult problem in the current core mold design and application.

[0003] Traditional core molds are widely used to prepare core molds for foil product packaging and transportation because of the low cost of glass fiber winding tubes and their tensile and bending strength. The load-bearing capacity of glass fiber winding tubes is closely related to the thickness of their windings. If the weight of the foil product increases, in order to ensure that the core mold can bear heavier package materials, the thickness of the glass fiber winding must be increased. Otherwise, the glass fiber winding tube cannot bear overweight foil products and is prone to deformation. It is difficult to bear heavier packages, which will lead to the scrapping of foil products. Although this approach has improved the strength of the core mold to a certain extent, increasing the winding thickness will directly lead to an increase in the overall volume of the core mold, reducing the convenience of transporting the core mold while increasing production costs; secondly, the increase in winding thickness will also affect the production efficiency of the core mold. As the number of glass fiber layers increases, the complexity of the production process will also increase, which will affect the overall production efficiency.

[0004] In addition to using glass fiber for winding, there are also methods that use stronger carbon fiber for winding, but the cost of carbon fiber materials is higher, and the thickness after winding still increases with the load. It is impossible to reduce the increase in thickness of the material after winding while meeting the larger load, and the problems of limited load capacity, inconvenient transportation, and rising costs still exist. In addition, since the length of the core mold is usually 1.6m-1.7m, it is difficult to ensure the straightness of the core mold under load conditions, which will directly affect the anti-bending performance of the core mold. Summary of the invention

[0005] Purpose of the invention: In view of the deficiencies in the prior art, the present invention provides a composite core mold and a process method thereof. The present invention increases the bending strength of the core mold and reduces the production cost by adding a metal reinforcement layer to the traditional pure fiber core mold.

[0006] Technical solution: A composite core mold, comprising an inner lining layer, a metal reinforcement layer, and an outer covering layer connected in sequence from the inside to the outside, the axial length of the metal reinforcement layer being smaller than the axial lengths of the inner lining layer and the outer covering layer, and closed layers are respectively provided on both axial end surfaces of the metal reinforcement layer, the inner surface of the closed layer is connected to the outer surface of the inner lining layer, the outer surface of the closed layer is connected to the inner surface of the outer covering layer, and the metal reinforcement layer continuously spans the load-bearing and heavy-load area.

[0007] The present invention combines fiber and metal to improve the strength of the core mold while reducing the amount of fiber material used, thereby reducing costs. The original cost of using only fiber materials is increased, the bending modulus and the load-bearing limit are increased, the weight of the core mold is reduced, and transportation is convenient. The metal reinforcement layer is completely wrapped in the fiber to prevent the metal reinforcement layer from leaking out, thereby avoiding foreign metal contamination caused by contact between the metal reinforcement layer and the foil product during packaging, or foreign metal contamination caused by metal powder falling off due to friction when the metal reinforcement layer contacts the tooling and then contacting the foil product package.

[0008] Preferably, in order to improve the bending strength of the core mold, the inner lining layer and the outer covering layer respectively include an axial winding layer and a radial winding layer, the axial winding layer and the radial winding layer are alternately arranged, the winding angle of the axial winding layer is 10-50° with the axis of the core rod, and the winding angle of the radial winding layer is 60-90° with the axis of the core rod.

[0009] The axial winding method can further improve the bending strength of the core mold. At the same time, in order to improve the reliability and stability of the axial winding, each layer of the axial winding layer is stabilized by alternating with the radial winding, so as to improve the bending strength of the core mold while ensuring its reliability and stability during winding.

[0010] Preferably, in order to match the bending strength of the core mold with the load-bearing requirements while ensuring the reliability and stability of the core mold, the axial winding layer accounts for 40-85%, and the remaining 15-60% is the radial winding layer.

[0011] Preferably, in order to improve the bending resistance of the core mold, the cross section of the outer covering layer is circular, so as to ensure the straightness and roundness of the core mold as a whole, so as to improve the strength and bending resistance of the core mold, and at the same time, the circular shape is convenient for processing and aluminum foil winding.

[0012] Preferably, in order to reduce the weight of the core mold, the metal reinforcement layer is a metal skeleton with a hollow structure.

[0013] Preferably, in order to further reduce the weight of the core mold, the metal skeletons are arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer.

[0014] Preferably, in order to improve processing efficiency when processing the outer covering layer, a filler is provided between adjacent metal skeletons, and the outer diameter of the cross section formed by the filler and the metal skeleton is circular.

[0015] The contour of the metal reinforcement layer is rounded by filling material, so that the outer covering layer can be directly wound based on the metal reinforcement layer with a circular outer diameter of the cross section, which helps to improve the processing efficiency of the outer covering layer while ensuring the roundness and facilitates the processing of the outer covering layer.

[0016] Preferably, in order to facilitate the installation of the metal skeleton, at least two groups of metal skeletons connected end to end in the circumferential direction are provided, and the axial length of each group of metal skeletons is equal. Since the core mold length is usually 1.6-1.7m, it is difficult to install a complete metal skeleton, so the metal skeleton is divided, and then the divided metal skeletons are connected end to end and installed in sequence, which improves the processing efficiency and reduces the process difficulty. For example, the cylindrical metal skeleton is cut along the axial direction, and the cut metal skeletons are connected end to end and installed in sequence.

[0017] Preferably, in order to enable the outer covering layer to be wound based on the roundness of the metal reinforcement layer and improve the processing efficiency of the outer covering layer, the thickness of the metal reinforcement layer is the same as the thickness of the sealing layer.

[0018] Preferably, in order to improve the bending modulus, the materials of the outer covering layer and the inner lining layer are both reinforced fiber materials.

[0019] The process for preparing the composite core mold comprises the following steps: Step 1: Material preparation: According to the current package load-bearing requirements, simulate the thickness of the inner lining layer, metal reinforcement layer, outer covering layer and the position of the load-bearing heavy-load area of ​​the core mold, prepare reinforcing fibers, resin, curing agent, metal skeleton, filler, and mix the resin and curing agent for subsequent winding; Step 2: Preparation of the inner lining layer: According to the thickness of the inner lining layer obtained by simulation in step 1, the reinforcing fibers attached with resin are wound on the outer cylindrical surface of the mandrel by a winding machine; Step 3: Installation of metal reinforcement layer: According to the thickness of the metal reinforcement layer obtained by simulation in step 1 and the position of the load-bearing and heavy-load area of ​​the core mold, fix the metal reinforcement layer on the outer surface of the inner lining layer with the resin attached along the circumferential direction of the outer diameter of the inner lining layer, and check whether the roundness of the metal reinforcement layer is within 0.1mm. If not, fill it with filler; Step 4: Install the sealing layer: fix the sealing layer with the same thickness as the metal reinforcement layer at both ends of the metal reinforcement layer. The sealing layer is prepared by gluing the reinforcing fiber cloth or by using a winding machine to wind the reinforcing fiber on both end surfaces of the metal reinforcement layer. Step 5, covering the outer covering layer: according to the thickness of the outer covering layer obtained by simulation in step 1, the reinforcing fibers attached with resin are covered and wound across the metal reinforcement layer and the closing layers at both ends by a winding machine; Step 6: Heating and curing the core mold; Step 7: Demould and remove the core rod to complete the core mould preparation.

[0020] When the metal reinforcement layer is a metal skeleton arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer, the step three is: The metal frame is fixed on the inner lining layer along the circumferential direction of the outer diameter of the inner lining layer through the resin on the outer surface of the inner lining layer, a mold with a circular cross-section is set on the outer surface of the metal frame, and the filler is filled into the adjacent metal frames and the gap between the outer surface of the metal frame and the inner surface of the mold. When the roundness of the metal reinforcement layer is within 0.1mm, the mold is removed to complete the installation of the metal reinforcement layer; The step three may be: Place the metal skeleton into a mold with a circular cross-section, fill the gap between the metal skeleton and the mold with filler until the roundness of the metal reinforcement layer is within 0.1mm, then prepare and shape it, demold it to form a prefabricated metal reinforcement layer, cut it into at least two groups along the axial direction, fix it on the inner lining layer along the circumferential direction, and complete the installation of the metal reinforcement layer.

[0021] When the metal reinforcement layer is a metal skeleton connected end to end along the circumferential direction of the outer diameter of the inner lining layer, the step three is specifically: cutting the metal skeleton into at least two groups along the axial direction, fixing the cut metal skeletons on the inner lining layer in sequence along the circumferential direction, and completing the installation of the metal reinforcement layer.

[0022] Beneficial effects: By adding a low-cost, high-bending modulus metal reinforcement layer between two fiber layers, the core mold of the present invention not only has a higher bending modulus and lower cost, but also has a larger load-bearing limit compared to the traditional pure fiber core mold under the same load-bearing requirements. It is lighter and easier to transport under the condition of equal load-bearing performance. At the same time, a closed layer is provided to prevent foreign metal contamination, thereby ensuring the quality of foil product packaging. By ensuring the roundness of the metal reinforcement layer, the efficiency of the outer covering layer processing is improved and the process difficulty is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the load-bearing and heavy-load area of ​​the present invention; Figure 3 It is a cross-sectional schematic diagram of the structure of the present invention; Figure 4 This is a schematic diagram of a metal skeleton in which the metal reinforcement layer of the present invention is a hollow structure; Figure 5 This is a schematic diagram of a metal frame of the present invention being a U-shaped steel beam; Figure 6 The metal skeleton of the present invention is a schematic diagram of an I-beam; Figure 7 This is a schematic diagram of a metal skeleton connected end to end according to the present invention; Figure 8 It is a schematic diagram of a metal skeleton with a hollow structure connected end to end according to the present invention. DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] like Figure 1As shown, a composite core mold includes an inner lining layer 1, a metal reinforcement layer 2, and an outer covering layer 3 connected in sequence from the inside to the outside. The axial length of the metal reinforcement layer 2 is smaller than the axial lengths of the inner lining layer 1 and the outer covering layer 3. The axial end surfaces of the metal reinforcement layer 2 are respectively provided with a sealing layer 4. The inner surface of the sealing layer 4 is connected to the outer surface of the inner lining layer 1, and the outer surface of the sealing layer 4 is connected to the inner surface of the outer covering layer 3. The metal reinforcement layer 2 continuously spans the load-bearing and heavy-load area. Figure 2 Shown is a schematic diagram of the load-bearing and heavy-load area.

[0029] Through the combination of fiber and metal, the strength of the core mold is improved while the amount of fiber material used is reduced, thereby reducing costs. The original cost of using only fiber materials is increased, the bending modulus and load limit are increased, the weight of the core mold is reduced, and transportation is convenient. The metal reinforcement layer 2 is completely wrapped in the fiber to prevent the metal reinforcement layer 2 from leaking out, thereby avoiding foreign metal contamination caused by contact between the metal reinforcement layer 2 and the foil product during packaging, or foreign metal contamination caused by friction between the metal reinforcement layer 2 and the tooling, which then causes metal powder to fall and contact with the foil product package.

[0030] In order to improve the bending strength of the core mold, the inner lining layer 1 and the outer covering layer 3 respectively include an axial winding layer and a radial winding layer, and the axial winding layer and the radial winding layer are alternately arranged. The winding angle of the axial winding layer is 10-50° with the axis of the core rod, and the winding angle of the radial winding layer is 60-90° with the axis of the core rod.

[0031] The axial winding method can further improve the bending strength of the core mold. At the same time, in order to improve the reliability and stability of the axial winding, each layer of the axial winding layer is stabilized by alternating with the radial winding, so as to improve the bending strength of the core mold while ensuring its reliability and stability during winding.

[0032] In order to match the bending strength of the core mold with the load-bearing requirements and ensure the reliability and stability of the core mold, the axial winding layer accounts for 40-85%, and the remaining 15-60% is the radial winding layer.

[0033] like Figure 3 As shown, in order to improve the bending resistance of the core mold, the cross section of the outer covering layer 3 is circular. The straightness and roundness of the core mold as a whole are ensured to improve the strength and bending resistance of the core mold. At the same time, the circular shape is convenient for processing and aluminum foil winding.

[0034] like Figure 4 As shown, in order to reduce the weight of the core mold, the metal reinforcement layer 2 is a metal skeleton 21 of the hollow structure 5.

[0035] like Figure 5 and Figure 6As shown, in order to further reduce the weight of the core mold, the metal skeletons 21 are arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer 1. The metal skeletons 21 used in this embodiment are U-shaped steel beams and I-shaped steel beams.

[0036] In order to improve the processing efficiency when processing the outer cover layer 3, a filler 22 is arranged between adjacent metal skeletons 21, and the outer diameter of the cross section formed by the filler 22 and the metal skeleton 21 is circular.

[0037] The contour of the metal reinforcement layer 2 is rounded by the filler 22, so that the outer covering layer 3 can be directly wound based on the metal reinforcement layer 2 with a circular outer diameter in cross section, which helps to improve the processing efficiency of the outer covering layer 3 while ensuring the roundness, and facilitates the processing of the outer covering layer 3.

[0038] like Figure 7 and Figure 8 As shown, in order to facilitate the installation of the metal skeleton 21, at least two groups of metal skeletons 21 connected end to end along the circumferential direction are provided, and the axial lengths of each group of metal skeletons 21 are equal.

[0039] Since the core mold is usually 1.6-1.7m long, it is difficult to fit the complete metal frame 21, so the metal frame 21 is divided, and then the divided metal frames 21 are connected end to end and installed in sequence, which improves the processing efficiency and reduces the process difficulty. For example, the cylindrical metal frame 21 is cut along the axial direction, and the cut metal frames 21 are connected end to end and installed in sequence.

[0040] In order to enable the outer covering layer 3 to be wound based on the roundness of the metal reinforcement layer 2 and improve the processing efficiency of the outer covering layer 3 , the thickness of the metal reinforcement layer 2 is the same as the thickness of the sealing layer 4 .

[0041] In order to improve the bending modulus, the materials of the outer cover layer 3 and the inner lining layer 1 are both reinforced fiber materials.

[0042] The process for preparing the composite core mold comprises the following steps: Step 1: Material preparation: According to the current package load-bearing requirements, the thickness of the inner lining layer 1, the metal reinforcement layer 2, the outer cover layer 3 and the position of the load-bearing heavy-load area of ​​the core mold are simulated, and the reinforcing fiber, resin, curing agent, metal skeleton 21, and filler 22 are prepared, and the resin and curing agent are mixed for subsequent winding; The thickness of each layer in this embodiment includes but is not limited to 1-10mm. The reinforcing fiber material of the present invention includes but is not limited to glass fiber, basalt fiber, carbon fiber and other reinforcing fibers. In this embodiment, carbon fiber of grade T700 or above is used as the reinforcing fiber. The material of the metal skeleton 21 in the present invention includes but is not limited to carbon steel, stainless steel, alloy steel, aluminum alloy and other pipe or profile materials. The structure of the metal skeleton 21 includes but is not limited to straight tube, corrugated tube, profile and other reinforcing structures. The filler 22 in this embodiment uses rigid polyurethane foam. In this embodiment, the resin uses bisphenol A epoxy resin with a viscosity of 400~800mPa·s, and the curing agent uses anhydride curing agent.

[0043] Step 2, preparation of the inner lining layer 1: according to the thickness of the inner lining layer 1 obtained by simulation in step 1, the reinforcing fibers attached with resin are wound on the outer circumferential surface of the mandrel by a winding machine; Step 3, installation of the metal reinforcement layer 2: according to the thickness of the metal reinforcement layer 2 obtained by simulation in step 1 and the position of the load-bearing and heavy-load area of ​​the core mold, the metal reinforcement layer 2 is fixed on the outer surface of the inner lining layer 1 attached with the resin along the circumferential direction of the outer diameter of the inner lining layer 1, and the roundness of the metal reinforcement layer 2 is checked to be within 0.1 mm. If not, fill it with filler 22; When the metal reinforcement layer 2 is a metal skeleton 21 arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer 1, the step three is: The metal skeleton 21 is fixed to the inner lining layer 1 along the circumferential direction of the outer diameter of the inner lining layer 1 by the resin on the outer surface of the inner lining layer 1, a mold with a circular cross-section is set on the outer surface of the metal skeleton 21, and the filler 22 is filled into the gap between the adjacent metal skeletons 21 and the outer surface of the metal skeleton 21 and the inner surface of the mold. When the roundness of the metal reinforcement layer 2 is within 0.1mm, the mold is removed to complete the installation of the metal reinforcement layer 2; The step three may be: Place the metal skeleton 21 into a mold with a circular cross-section, fill the gap between the metal skeleton 21 and the mold with filler 22, fill it until the roundness of the metal reinforcement layer 2 is within 0.1mm, and then prepare it for forming. Demolding forms a prefabricated metal reinforcement layer 2, cut it into at least two groups along the axial direction, and fix it on the inner lining layer 1 along the circumferential direction to complete the installation of the metal reinforcement layer 2.

[0044] When the metal reinforcement layer 2 is a metal skeleton 21 connected end to end along the circumferential direction of the outer diameter of the inner lining layer 1, the step three is specifically as follows: The metal skeleton 21 is cut into at least two groups along the axial direction, and the cut metal skeletons 21 are fixed on the inner lining layer 1 in sequence along the circumferential direction to complete the installation of the metal reinforcement layer 2 .

[0045] Step 4: Install the sealing layer 4: fix the sealing layer 4 with the same thickness as the metal reinforcement layer 2 at both ends of the metal reinforcement layer 2. The sealing layer 4 is prepared by gluing the reinforcing fiber cloth or by using a winding machine to wind the reinforcing fiber on both end surfaces of the metal reinforcement layer 2. In this embodiment, 3K plain weave 200g / m2 carbon fiber braided fabric is used as the reinforcing fiber cloth.

[0046] Step 5, covering the outer covering layer 3: according to the thickness of the outer covering layer 3 obtained by simulation in step 1, the reinforcing fibers attached with resin are covered and wound across the metal reinforcement layer 2 and the closing layers 4 at both ends by a winding machine; Step 6: Core mold curing: preheat and gel at 70-80°C, then heat to 130-140°C to complete core mold curing; Step 7: Demould and remove the core rod to complete the core mould preparation.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite core mold, characterized in that: The invention comprises an inner lining layer (1), a metal reinforcement layer (2), and an outer covering layer (3) which are connected in sequence from the inside to the outside, wherein the axial length of the metal reinforcement layer (2) is smaller than the axial lengths of the inner lining layer (1) and the outer covering layer (3), and the axial end surfaces of the metal reinforcement layer (2) are respectively provided with a sealing layer (4), the inner surface of the sealing layer (4) is connected to the outer surface of the inner lining layer (1), and the outer surface of the sealing layer (4) is connected to the inner surface of the outer covering layer (3), and the metal reinforcement layer (2) continuously spans the load-bearing and heavy-load area.

2. The composite core mold according to claim 1, characterized in that: The inner lining layer (1) and the outer covering layer (3) respectively comprise an axial winding layer and a radial winding layer, the axial winding layer and the radial winding layer are arranged alternately, the winding angle of the axial winding layer is 10-50° with respect to the axis of the mandrel, and the winding angle of the radial winding layer is 60-90° with respect to the axis of the mandrel.

3. The composite core mold according to claim 2, characterized in that: The axial winding layer accounts for 40-85%, and the remaining 15-60% is the radial winding layer.

4. The composite core mold according to claim 1, characterized in that: The cross section of the outer covering layer (3) is circular.

5. The composite core mold according to claim 4, characterized in that: The metal reinforcement layer (2) is a metal skeleton (21) of the hollow structure (5).

6. The composite core mold according to claim 4 or 5, characterized in that: The metal skeletons (21) are arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer (1).

7. The composite core mold according to claim 6, characterized in that: Filling material (22) is arranged between adjacent metal skeletons (21), and the outer diameter of the cross section formed by the filling material (22) and the metal skeleton (21) is circular.

8. The composite core mold according to claim 4 or 5, characterized in that: At least two groups of metal skeletons (21) connected end to end along the circumferential direction are provided, and the axial lengths of each group of metal skeletons (21) are equal.

9. The composite core mold according to claim 4, characterized in that: The thickness of the metal reinforcement layer (2) is the same as the thickness of the sealing layer (4).

10. The composite core mold according to claim 1, characterized in that: The materials of the outer covering layer (3) and the inner lining layer (1) are both reinforced fiber materials.

11. A process for preparing the composite core mold according to any one of claims 1 to 10, characterized in that: The following steps are involved: Step 1: Material preparation: according to the current package load-bearing requirements, the thickness of the inner lining layer (1), the metal reinforcement layer (2), the outer covering layer (3) and the position of the load-bearing heavy-load area of ​​the core mold are simulated, and the reinforcing fiber, resin, curing agent, metal skeleton (21), and filler (22) are prepared, and the resin and curing agent are mixed for subsequent winding; Step 2: Preparation of the inner lining layer (1): Based on the thickness of the inner lining layer (1) obtained by simulation in step 1, the reinforcing fibers attached with resin are wound on the outer circumferential surface of the core rod by a winding machine; Step 3, installation of the metal reinforcement layer (2): according to the thickness of the metal reinforcement layer (2) obtained by simulation in step 1 and the position of the load-bearing heavy-load area of ​​the core mold, the metal reinforcement layer (2) is fixed on the outer surface of the inner lining layer (1) attached with the resin along the circumferential direction of the outer diameter of the inner lining layer (1), and the roundness of the metal reinforcement layer (2) is checked to be within 0.1 mm. If not, it is filled with filler (22); Step 4: Installing the sealing layer (4): fixing sealing layers (4) of the same thickness as the metal reinforcement layer (2) at both ends of the metal reinforcement layer (2); the sealing layer (4) is prepared by gluing reinforcing fiber cloth or by using a winding machine to wind reinforcing fibers around the two end surfaces of the metal reinforcement layer (2); Step 5, covering the outer covering layer (3): according to the thickness of the outer covering layer (3) obtained by simulation in step 1, the reinforcing fibers attached with resin are covered and wound across the metal reinforcement layer (2) and the closing layers (4) at both ends by a winding machine; Step 6: Heating and curing the core mold; Step 7: Demould and remove the core rod to complete the core mould preparation.

12. The process of making a composite core mold according to claim 11, characterized in that: When the metal reinforcement layer (2) is a metal skeleton (21) arranged at intervals along the circumferential direction of the outer diameter of the inner lining layer (1), the step three is: The metal frame (21) is fixed to the inner lining layer (1) along the circumferential direction of the outer diameter of the inner lining layer (1) by means of the resin on the outer surface of the inner lining layer (1), a mold with a circular cross-section is mounted on the outer surface of the metal frame (21), and a filler (22) is filled into the gap between the adjacent metal frames (21) and the outer surface of the metal frame (21) and the inner surface of the mold. When the roundness of the metal reinforcement layer (2) is within 0.1 mm, the mold is removed to complete the installation of the metal reinforcement layer (2); The step three may be: The metal skeleton (21) is placed in a mold with a circular cross-section, and the gap between the metal skeleton (21) and the mold is filled with a filler (22) until the roundness of the metal reinforcement layer (2) is within 0.1 mm. The prefabricated metal reinforcement layer (2) is formed by demolding, and the prefabricated metal reinforcement layer (2) is cut into at least two groups along the axial direction and fixed on the inner lining layer (1) along the circumferential direction to complete the installation of the metal reinforcement layer (2).

13. The process of making a composite core mold according to claim 11, characterized in that: When the metal reinforcement layer (2) is a metal skeleton (21) connected end to end along the circumferential direction of the outer diameter of the inner lining layer (1), the step three is specifically as follows: The metal skeleton (21) is cut into at least two groups along the axial direction, and the cut metal skeletons (21) are fixed to the inner lining layer (1) in sequence along the circumferential direction, thereby completing the installation of the metal reinforcement layer (2).

Images