Forming tool for composite material barrel

Abstract

The utility model belongs to the technical field of composite material barrel forming, and relates to a forming tool for a composite material barrel, which comprises an outer forming die and an inner forming die. A mounting cavity for accommodating the forming inner mold is formed in the forming outer mold, and the forming inner mold is positioned in the mounting cavity; the inner surface of the forming outer mold is matched with the outer surface of the composite material barrel in shape, and the outer surface of the forming inner mold is matched with the inner surface of the composite material barrel in shape; the forming inner mold is located in the installation cavity of the forming outer mold, the composite material is laid on the outer surface of the forming inner mold, the forming inner mold and the forming outer mold jointly support the composite material, it is ensured that the composite material is evenly formed in the hot press forming process, the defects of corrugation, wrinkles and the like generated on the surface of a formed composite material barrel are avoided, and the quality of the composite material barrel is improved. And the surface quality and the overall performance of the composite material barrel are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material cylinder molding, in particular to a molding tool for composite material cylinders. Background Art

[0002] With the continuous development of composite materials technology, composite cylinders have found widespread application in aerospace, automotive manufacturing, energy, and other fields due to their excellent mechanical properties and lightweight characteristics. However, the molding process for composite cylinders is complex, especially when molding special-shaped cylinders. Ensuring molding accuracy and demolding quality is a pressing technical challenge.

[0003] There is some research on the molding of composite material cylinders in the prior art. Referring to the patent document with application number 202410861800.6, a special-shaped hollow cylinder molding tool is disclosed, including: an intermediate core shaft; an upper core shaft, a lower core shaft, a left core shaft and a right core shaft respectively installed on the intermediate core shaft, and the molding surface of the upper core shaft, the molding surface of the lower core shaft, the molding surface of the left core shaft and the molding surface of the right core shaft are combined into a molding surface that matches the inner surface of the special-shaped hollow cylinder; the upper core shaft, the lower core shaft, the left core shaft and the right core shaft are respectively connected to the intermediate core shaft through plug-in positioning parts; a front baffle, the front baffle is respectively connected to one end of the upper core shaft, the lower core shaft, the left core shaft and the right core shaft; a rear baffle, the rear baffle is respectively connected to the other end of the upper core shaft, the lower core shaft, the left core shaft and the right core shaft; the operator lays the composite material on the molding surface and hot presses it to obtain the air intake cylinder.

[0004] However, in the actual hot pressing process, the composite material laid on the forming surface is directly heated and pressurized, and the composite material is prone to non-uniform deformation, resulting in defects such as corrugations and wrinkles on the surface of the formed composite material cylinder, affecting the surface quality and overall performance of the composite material cylinder. Utility Model Content

[0005] In order to solve the technical problem in the background art that the composite material laid on the forming surface is directly heated and pressurized, and the composite material is prone to non-uniform deformation, the utility model provides a forming tool for a composite material cylinder.

[0006] The utility model discloses a molding tool for a composite material cylinder, wherein the molding inner mold is located in the installation cavity of the molding outer mold, the composite material is laid on the outer surface of the molding inner mold, and the molding inner mold and the molding outer mold jointly support the composite material, thereby ensuring that the composite material is uniformly molded during the hot pressing molding process, avoiding defects such as corrugations and wrinkles on the surface of the molded composite material cylinder, and improving the surface quality and overall performance of the composite material cylinder.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A forming tool for a composite material cylinder comprises: a forming outer mold and a forming inner mold; a mounting cavity for accommodating the forming inner mold is formed inside the forming outer mold, and the forming inner mold is located in the mounting cavity; the inner surface of the forming outer mold matches the outer surface shape of the composite material cylinder, and the outer surface of the forming inner mold matches the inner surface shape of the composite material cylinder.

[0009] In a specific possible implementation scheme, the molding outer mold includes a first enclosing portion, a second enclosing portion and a connecting member; the first enclosing portion and the second enclosing portion are enclosed to form an installation cavity; the connecting member is installed on the first enclosing portion and / or the second enclosing portion to connect the first enclosing portion and the second enclosing portion.

[0010] In a specific possible implementation scheme, the two ends of the outer molding mold are respectively provided with a first clearance hole and a second clearance hole, and the first clearance hole and the second clearance hole are both provided in the contact part between the first enclosing part and the second enclosing part; the two ends of the inner molding mold extend out of the installation cavity through the first clearance hole and the second clearance hole respectively.

[0011] In a specific possible implementation scheme, the molding outer mold also includes a first limiting plate and a second limiting plate; the first limiting plate and the second limiting plate are respectively arranged near the two ends of the molding inner mold, and the first limiting plate and the second limiting plate are both connected to the first enclosing part.

[0012] In a specific possible implementation manner, a slot is provided on one side of the first limiting plate close to the second enclosing portion, and a portion of the inner molding die extending out of the mounting cavity is engaged in the slot.

[0013] In a specific possible implementation manner, the outer molding mold further includes a lifting ring; the lifting ring is connected to the first enclosing portion and / or the second enclosing portion.

[0014] In a specific possible implementation scheme, the molding inner mold includes a core shaft and a combined mold body; the combined mold body is sleeved on the outer periphery of the core shaft, and the outer surface of the combined mold body matches the inner surface shape of the composite material cylinder; the two ends of the core shaft extend out of the installation cavity through the first clearance hole and the second clearance hole respectively.

[0015] In a specific embodiment, the combined mold body includes a plurality of split molds; the plurality of split molds are distributed side by side along the axial direction of the core shaft, and the plurality of split molds are spliced together to form the combined mold body.

[0016] In a specific possible implementation scheme, the molding inner mold also includes a first sealing end cover and a second sealing end cover; the first sealing end cover and the second sealing end cover are both mounted on the core shaft, and the first sealing end cover and the second sealing end cover are both located in the installation cavity, and the first sealing end cover and the second sealing end cover are respectively connected to the two ends of each split mold.

[0017] In a specific embodiment, the cross-sections of the first sealing end cover and the second sealing end cover are both semicircular.

[0018] In summary, the present invention has the following beneficial technical effects:

[0019] 1. The utility model is a molding tool for a composite material cylinder. The molding inner mold is located in the installation cavity of the molding outer mold. The composite material is laid on the outer surface of the molding inner mold. The molding inner mold and the molding outer mold jointly support the composite material to ensure that the composite material is uniformly molded during the hot pressing molding process, avoiding defects such as corrugations and wrinkles on the surface of the composite material cylinder after molding, and improving the surface quality and overall performance of the composite material cylinder.

[0020] 2. The composite cylinder molding tool of the present invention connects a first sealing end cap and a second sealing end cap at both ends of each split mold, thereby improving the sealing of the molding inner mold, preventing air, moisture or other impurities from entering during the composite material curing process, and ensuring the quality and performance of the composite cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a partial structural diagram of a molding tool for a composite material cylinder of the utility model, and is intended to illustrate the molding outer mold.

[0022] Figure 2 This is a cross-sectional view of a molding tool for a composite material cylinder of the present invention, and is intended to illustrate an outer molding mold.

[0023] Figure 3 It is a left view of the outer molding die of the molding tool for composite material cylinder of the utility model.

[0024] Figure 4 This is a partial structural diagram of a molding tool for a composite material cylinder of the present invention, and is intended to illustrate an inner molding mold.

[0025] Figure 5 It is a front view of the inner mold of the molding tool for the composite material cylinder of the utility model.

[0026] Figure 6 It is a top view of the inner mold of the molding tool for the composite material cylinder of the utility model.

[0027] Figure 7It is a left view of the inner mold of the molding tool for the composite material cylinder of the utility model.

[0028] Figure 8 It is a right side view of the inner mold of the molding tool for the composite material cylinder of the utility model.

[0029] Explanation of the accompanying drawings: 1. Molding outer mold; 11. First enclosing part; 12. Second enclosing part; 13. First limiting plate; 14. Second limiting plate; 15. Lifting ring; 2. Molding inner mold; 21. Core shaft; 22. Combined mold body; 23. First sealing end cover; 24. Second sealing end cover; 25. First clearance hole; 26. Second clearance hole. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0031] In the present invention, the composite material cylinder is 925 mm long and includes a large-diameter end and a small-diameter end. In the prior art, during the actual composite material hot press molding process, the composite material applied to the molding surface is directly heated and pressurized, which can easily cause non-uniform deformation of the composite material, resulting in surface defects such as ripples and wrinkles on the molded composite material cylinder, affecting the surface quality and overall performance of the composite material cylinder.

[0032] Reference Figure 1 A composite material cylinder forming tool comprises an inner forming mold 2 and an outer forming mold 1. The outer forming mold 1 has an interior formed with a mounting cavity for accommodating the inner forming mold 2, and the inner forming mold 2 is located within the mounting cavity; the inner surface of the outer forming mold 1 matches the outer surface shape of the composite material cylinder, and the outer surface of the inner forming mold 2 matches the inner surface shape of the composite material cylinder.

[0033] In the present invention, first, the composite material cylinder is laid on the outer surface of the forming inner mold 2, and then the forming inner mold 2 is placed in the installation cavity of the forming outer mold 1, and then the forming outer mold 1 is placed in a hot press. The hot press solidifies the composite material cylinder, and demolding is performed after the composite material cylinder is solidified and formed; when demolding, the forming outer mold 1 is first opened, and then the forming inner mold 2 is pulled out from the inner cavity of the composite material cylinder, thereby realizing the demolding of the composite material cylinder.

[0034] In the present invention, during the curing process of the composite material, the molding outer mold 1, the molding inner mold 2 and the composite material cylinder jointly bear forces from all sides to form a stable stress field. When the composite material cylinder needs to be demolded after molding, the molding outer mold 1 is removed, and the molding outer mold 1 releases the constraint on the composite material cylinder, so that the stress on the composite material cylinder is evenly distributed, reducing the stress concentration on the composite material cylinder caused by the sudden release of the constraint, and avoiding the composite material cylinder from cracking during the demolding process.

[0035] Reference Figures 1 to 3 The outer mold 1 includes a first enclosure 11, a second enclosure 12, and a connector. The first enclosure 11 and the second enclosure 12 enclose each other to form a mounting cavity. The connector is mounted on the first enclosure 11 and / or the second enclosure 12 to connect the first enclosure 11 and the second enclosure 12.

[0036] In the present invention, the first enclosing portion 11 and the second enclosing portion 12 are enclosed to form a box structure, and the length of the box structure is 1010 mm; the outer molding die 1 is set as a box structure to improve the support stability of the outer molding die 1 on the composite material.

[0037] In the present invention, the connecting piece may be a locking bolt, a hinge shaft, a buckle, etc.; the provided connecting piece facilitates the adjustment of the first enclosing portion 11 and the second enclosing portion 12 to be buckled or opened with each other, and such a setting method is acceptable.

[0038] Reference Figure 4 and Figure 5 The inner molding die 2 comprises a core shaft 21 and a combined die body 22. The combined die body 22 is sleeved around the outer periphery of the core shaft 21, and the outer surface of the combined die body 22 matches the inner surface shape of the composite material cylinder. The ends of the core shaft 21 extend out of the mounting cavity through a first clearance hole 25 and a second clearance hole 26, respectively. In this embodiment, the radius of the core shaft 21 is 50.9 mm.

[0039] Reference Figure 6 The combined mold body 22 includes a plurality of split molds, which are distributed side by side along the axial direction of the core shaft 21 , and the plurality of split molds are spliced together to form the combined mold body 22 .

[0040] In the present invention, there is no specific restriction on the number and shape of the split molds. The operator sets the split molds of corresponding number and shape according to the shape of the composite material cylinder, so that the outer surface of the combined mold body 22 composed of multiple split molds is consistent with the inner surface shape of the composite material cylinder. This type of setting method is acceptable.

[0041] Reference Figure 1 、 Figure 4 、 Figure 7 as well as Figure 8The two ends of the outer molding mold 1 are respectively provided with a first clearance hole 25 and a second clearance hole 26, and the first clearance hole 25 and the second clearance hole 26 are both provided at the contact part between the first enclosing part 11 and the second enclosing part 12; the two ends of the inner molding mold 2 extend out of the installation cavity through the first clearance hole 25 and the second clearance hole 26 respectively.

[0042] Example 1:

[0043] Reference Figure 1 In this embodiment, the composite material cylinder forming tool is used, and the connecting piece is a hinge shaft, one end of the hinge shaft is movably connected to the first enclosing part 11, and the other end of the hinge shaft is movably connected to the second enclosing part 12.

[0044] In this embodiment, the connecting part is a hinge shaft, and the operator can open and close the first enclosing part 11 and the second enclosing part 12 by rotating, which facilitates the assembly and disassembly of the composite material cylinder during the molding process and improves work efficiency; in addition, the connecting part is a hinge shaft, which improves the connection stability between the first enclosing part 11 and the second enclosing part 12, and avoids the displacement of the first enclosing part 11 and the second enclosing part 12 during the molding process of the composite material cylinder, thereby ensuring the molding quality and precision of the composite material cylinder.

[0045] Example 2:

[0046] Reference Figure 1 、 Figure 2 、 Figure 7 as well as Figure 8 In this embodiment of the composite material cylinder forming tooling, the outer forming mold 1 further includes a first limiting plate 13 and a second limiting plate 14. The first limiting plate 13 and the second limiting plate 14 are respectively disposed near the ends of the inner forming mold 2, and both the first limiting plate 13 and the second limiting plate 14 are connected to the first enclosure 11.

[0047] Specifically, the first limiting plate 13 can be connected to the first enclosure 11 by bolts, pins, etc. In the present invention, the first limiting plate 13 is connected to the first enclosure 11 by bolts. The structure of the second limiting plate 14 is the same as that of the first limiting plate 13.

[0048] More specifically, the first limiting plate 13 and the second limiting plate 1 are both provided with a card slot on one side close to the second enclosing portion 12, the shape of the card slot matches the shape of the portion of the forming inner mold 2 extending out of the mounting cavity, and the portion of the forming inner mold 2 extending out of the mounting cavity is engaged in the card slot; the provided card slot facilitates the card connection of the forming inner mold 2 to avoid displacement of the forming inner mold 2 during the actual hot pressing process.

[0049] Example 3:

[0050] Reference Figure 1In this embodiment, the composite material cylinder forming tooling, the forming outer mold 1 further includes a lifting ring 15; the lifting ring 15 is connected to the first enclosing portion 11 and / or the second enclosing portion 12.

[0051] Specifically, there is no specific limit to the number of lifting rings 15. A suitable number of lifting rings 15 can be provided on the outer molding die 1 to facilitate operators in carrying the composite material cylinder using the molding tool. Such a setting method is acceptable.

[0052] In this embodiment, a lifting ring 15 is provided on the outer forming mold 1 to facilitate operators to carry the composite material cylinder using the forming tool, thereby improving work efficiency.

[0053] Example 4:

[0054] Reference Figures 4 to 6 In this embodiment, the composite material cylinder forming tooling includes a forming inner mold 2 further comprising a first sealing end cap 23 and a second sealing end cap 24. The first sealing end cap 23 and the second sealing end cap 24 are both sleeved on the core shaft 21 and are both located in the mounting cavity. The first sealing end cap 23 and the second sealing end cap 24 are respectively connected to the two ends of each split mold.

[0055] Specifically, the first sealing end cap 23 is close to the large diameter end of the composite material cylinder, and the second sealing end cap 24 is close to the small diameter end of the composite material cylinder. The first sealing end cap 23 and the second sealing end cap 24 are respectively connected to the two ends of each split mold by bolts.

[0056] In this embodiment, a first sealing end cover 23 and a second sealing end cover 24 are respectively connected to the two ends of each split mold to improve the sealing performance of the molding inner mold 2, prevent air, moisture or other impurities from entering during the curing process of the composite material, and ensure the quality and performance of the composite material cylinder; in addition, the first sealing end cover 23 and the second sealing end cover 24 are connected to the split mold with bolts, which facilitates the demolding operation after the composite material cylinder is formed.

[0057] Example 5:

[0058] Reference Figure 4 、 Figure 7 as well as Figure 8 In this embodiment, the composite material cylinder is formed using a molding tool, and the cross-sectional areas of the first sealing end cover 23 and the second sealing end cover 24 are both semicircular.

[0059] In this embodiment, the cross-sectional areas of the first sealing end cover 23 and the second sealing end cover 24 are both semicircular. The semicircular design helps to reduce stress concentration during the demolding process. After the composite material cylinder is solidified and formed, it is convenient to smoothly guide the composite material cylinder to separate from the split mold, thereby reducing the risk of cracking of the composite material cylinder due to sudden release of constraints.

[0060] The working principle of the molding tool for a composite material cylinder of the present invention is as follows: during the molding process, the composite material is first laid on the outer surface of the combined mold body 22; then, the molding inner mold 2 with the composite material laid is placed in the installation cavity of the molding outer mold 1, and the first enclosure portion 11 and the second enclosure portion 12 are connected by a connecting piece; then, the entire composite material cylinder is placed in a hot press with a molding tool, and the hot press heats and pressurizes the composite material cylinder in the molding tool, so that it undergoes a curing reaction under a high temperature and high pressure environment.

[0061] After the composite cylinder is completely solidified and formed, the demoulding operation is carried out. First, the first enclosure 11 and the second enclosure 12 of the outer mold 1 are opened through the connecting parts, and the inner mold 2 is removed from the installation cavity; then, the first sealing end cover 23 and the second sealing end cover 24 are separated from each split mold and removed; then, force is applied to the core shaft 21 at the small diameter end of the composite cylinder, and the core shaft 21 is pulled out from the large diameter end of the composite cylinder; finally, each split mold is removed from the large diameter end of the composite cylinder from top to bottom, thus achieving demoulding of the composite cylinder.

[0062] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite material cylinder forming tool, characterized in that: include: A forming outer mold (1) and a forming inner mold (2); A mounting cavity for accommodating the inner molding mold (2) is formed inside the outer molding mold (1), and the inner molding mold (2) is located in the mounting cavity; The inner surface of the outer molding die (1) matches the outer surface shape of the composite material cylinder, and the outer surface of the inner molding die (2) matches the inner surface shape of the composite material cylinder.

2. The composite material cylinder forming tool according to claim 1, characterized in that: The outer molding die (1) comprises a first enclosing portion (11), a second enclosing portion (12) and a connecting piece; The first enclosing portion (11) and the second enclosing portion (12) are enclosed to form a mounting cavity; The connecting member is installed on the first enclosure (11) and / or the second enclosure (12) and is used to connect the first enclosure (11) and the second enclosure (12).

3. The composite material cylinder forming tool according to claim 2, characterized in that: A first paving hole (25) and a second paving hole (26) are respectively provided at both ends of the outer molding die (1), and the first paving hole (25) and the second paving hole (26) are both provided at the contact portion between the first enclosing portion (11) and the second enclosing portion (12); Both ends of the inner forming mold (2) extend out of the installation cavity through a first clearance hole (25) and a second clearance hole (26) respectively.

4. The composite material cylinder forming tool according to claim 3, characterized in that: The outer molding die (1) further comprises a first limiting plate (13) and a second limiting plate (14); The first limiting plate (13) and the second limiting plate (14) are respectively arranged close to the two ends of the inner forming mold (2), and the first limiting plate (13) and the second limiting plate (14) are both connected to the first enclosing portion (11).

5. The composite material cylinder forming tool according to claim 4, characterized in that: The first limiting plate (13) is provided with a slot on one side close to the second enclosing portion (12), and the portion of the inner molding die (2) extending out of the installation cavity is engaged in the slot.

6. The composite material cylinder forming tool according to claim 5, characterized in that: The outer molding die (1) further comprises a lifting ring (15); The lifting ring (15) is connected to the first enclosing portion (11) and / or the second enclosing portion (12).

7. The composite material cylinder forming tool according to claim 5 or 6, characterized in that: The inner forming mold (2) comprises a core shaft (21) and a combined mold body (22); The combined mold body (22) is sleeved on the outer periphery of the core shaft (21), and the outer surface of the combined mold body (22) matches the shape of the inner surface of the composite material cylinder; Both ends of the core shaft (21) extend out of the installation cavity through a first clearance hole (25) and a second clearance hole (26) respectively.

8. The composite material cylinder forming tool according to claim 7, characterized in that: The combined mold (22) includes a plurality of split molds; The plurality of split molds are distributed side by side along the axial direction of the core shaft (21), and the plurality of split molds are spliced together to form a combined mold body (22).

9. The composite material cylinder forming tool according to claim 8, characterized in that: The inner forming mold (2) further comprises a first sealing end cover (23) and a second sealing end cover (24); The first sealing end cover (23) and the second sealing end cover (24) are both sleeved on the core shaft (21), and the first sealing end cover (23) and the second sealing end cover (24) are both located in the installation cavity, and the first sealing end cover (23) and the second sealing end cover (24) are respectively connected to the two ends of each split mold.

10. The composite material cylinder forming tool according to claim 9, characterized in that: The cross sections of the first sealing end cover (23) and the second sealing end cover (24) are both semicircular.

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