Composite material sandwich bent pipe forming equipment

Abstract

The utility model provides composite material sandwich elbow pipe forming equipment which comprises a sandwich forming tool and a composite material sandwich elbow pipe forming tool, and foaming glue is sprayed in a foaming inner core forming area arranged in the sandwich forming tool. Carrying out first-time foaming, hardening and forming at normal temperature to obtain a foaming inner core of the sandwich elbow; a sandwich pipe fitting formed by paving a composite material on the outer surface of the foaming inner core is foamed, hardened and formed for the second time in a high-temperature state in a composite material sandwich elbow forming area arranged in the composite material sandwich elbow forming tool, so that the composite material sandwich elbow is obtained. Therefore, the composite material sandwich elbow pipe can be paved and formed by a simple forming process, meanwhile, the thickness of a mold closing part is uniform, the mechanical property of the mold closing part is not influenced, the mechanical property of the mold closing part can be ensured, and the preparation requirement of a special-shaped composite material pipe fitting with a large length-diameter ratio is met.

Description

Technical Field

[0001] The utility model relates to the technical field of composite sandwich tubes, in particular to composite sandwich tube bending forming equipment. Background Art

[0002] The wall of the sandwich elbow is solidified by carbon fiber, and the interior is filled with foam. When laying out the traditional special-shaped composite elbow, it is generally laid out in half, and then the mold is closed and vacuumed for curing, which leads to a thicker thickness at the mold, which is easy to cause deviation and affect the mechanical properties of the mold, and cannot meet the molding requirements of special-shaped composite pipes with large aspect ratios. Therefore, how to make special-shaped composite pipes with large aspect ratios become a key technical problem to be solved. Utility Model Content

[0003] The main purpose of the utility model is to provide a composite sandwich tube bending forming equipment to solve the problem that the thickness of the traditional special-shaped composite tube bending will be too thick at the mold joint during forming, which is easy to cause deviation, affect the mechanical properties of the mold joint, and cannot meet the preparation requirements of special-shaped composite tube fittings with large aspect ratio.

[0004] In order to solve the above technical problems, the embodiment of the utility model provides a composite material sandwich tube bending forming equipment, including: a sandwich forming tool and a composite material sandwich tube bending forming tool, wherein:

[0005] The sandwich forming tool comprises a foaming inner core forming area arranged inside the tool, which is used to foam and harden the foam glue sprayed in the foaming inner core forming area at room temperature for the first time to obtain the foaming inner core of the sandwich elbow;

[0006] The composite sandwich tube bending forming tooling includes a composite sandwich tube bending forming area arranged inside the tooling, which is used to perform a second foaming and hardening forming of the sandwich tube part contained in the composite sandwich tube bending forming area after the composite material is laid on the outer surface of the foaming inner core under high temperature to obtain a composite sandwich tube bending.

[0007] Compared with the prior art, the utility model provides a composite material sandwich tube bending forming equipment, which includes: a sandwich forming tool and a composite material sandwich tube bending forming tool, wherein the foaming glue is sprayed on the foaming inner core forming area arranged inside the sandwich forming tool, and the foaming inner core of the sandwich tube is formed by the first foaming and hardening at room temperature; the composite material sandwich tube bending forming area arranged inside the composite material sandwich tube bending forming tool will pass through the sandwich tube after the composite material is paved on the outer surface of the foaming inner core, and the composite material sandwich tube bending is formed by the second foaming and hardening at high temperature. Thus, by using two sets of forming tools, the sandwich forming tool and the composite material sandwich tube bending forming tool, it can be ensured that the composite material sandwich tube can be paved and formed by a simple forming process, and at the same time, the thickness at the mold joint is uniform, which will not affect the mechanical properties of the mold joint, and its mechanical properties can be guaranteed, so that the preparation of the composite material sandwich tube product is simple and easy, with low cost investment and high product quality, and can meet the preparation requirements of special-shaped composite material tubes with large aspect ratio. This can solve the problem that the thickness of the traditional special-shaped composite bent pipe will be too thick at the mold joint during molding, which is easy to cause deviation, affect the mechanical properties of the mold joint, and cannot meet the preparation requirements of special-shaped composite pipe fittings with a large aspect ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0009] Figure 1 A schematic diagram of the structure of a composite sandwich tube bending forming device provided by the utility model;

[0010] Figure 2 A schematic diagram of the structure of a sandwich forming tool in a composite material sandwich tube bending forming device provided by the utility model;

[0011] Figure 3 A schematic diagram of the mold closing of a sandwich forming tooling in a composite material sandwich tube bending forming device provided by the utility model;

[0012] Figure 4 A schematic structural diagram of positioning of a sandwich forming tool in a composite material sandwich tube bending forming device provided by the utility model;

[0013] Figure 5 Another structural schematic diagram of positioning a sandwich forming tool in a composite material sandwich tube bending forming device provided by the utility model;

[0014] Figure 6A schematic diagram of the structure of a composite material sandwich tube bending tooling in a composite material sandwich tube bending device provided by the utility model;

[0015] Figure 7 A structural schematic diagram of positioning a composite material sandwich tube bending forming tool in a composite material sandwich tube bending forming device provided by the utility model;

[0016] Figure 8 Another structural schematic diagram of positioning a composite material sandwich tube bending forming tool in a composite material sandwich tube bending forming device provided by the utility model;

[0017] Fig. 9 A schematic diagram of the structure of a composite sandwich elbow provided by the utility model;

[0018] Fig.10 A schematic diagram of the mold clamping of the anti-torsion part of the composite material sandwich tube bending forming equipment in the composite material sandwich tube bending forming equipment provided by the utility model;

[0019] Fig.11 A schematic diagram of a composite material sandwich tube bending forming tooling mold clamping device in a composite material sandwich tube bending forming device provided by the utility model;

[0020] Fig.12 A schematic structural diagram of a composite material sandwich bend obtained by a composite material sandwich bend forming tool in a composite material sandwich bend forming device provided by the utility model;

[0021] Fig.13 A schematic diagram of a composite material sandwich bend obtained by a composite material sandwich bend forming tool in a composite material sandwich bend forming device provided by the utility model;

[0022] Fig.14 The utility model provides a schematic flow chart of a composite material sandwich bending tube forming method. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "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, and do not indicate or imply 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.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In one embodiment, Figures 1 to 6 As shown, the utility model provides a composite material sandwich tube bending forming device, the composite material sandwich tube bending forming device 100 comprises: a sandwich forming tool 10 and a composite material sandwich tube bending forming tool 20, wherein:

[0028] The sandwich forming tool 10 includes a foaming inner core forming area arranged inside the sandwich forming tool 10, which is used to perform the first foaming and hardening of the foam glue sprayed in the foaming inner core forming area at room temperature to obtain the foaming inner core 31 of the sandwich elbow;

[0029] The composite sandwich tube bending forming tool 20 includes a composite sandwich tube bending forming area arranged inside it, which is used to perform a second foaming and hardening forming of the sandwich tube 32 contained in the composite sandwich tube bending forming area after the composite material 33 is laid on the outer surface of the foamed inner core 31 under high temperature to obtain a composite sandwich tube 30.

[0030] In this embodiment, a composite sandwich tube bending forming device is provided, including: a sandwich forming tool and a composite sandwich tube bending forming tool, a foaming glue is sprayed on a foaming inner core forming area set inside the sandwich forming tool, and a foaming inner core of the sandwich tube is formed by the first foaming and hardening at room temperature; a sandwich tube after the composite material is paved on the outer surface of the foaming inner core is formed in the composite sandwich tube forming area set inside the composite sandwich tube bending forming tool, and a composite sandwich tube is formed by the second foaming and hardening at high temperature. Thus, by using two sets of forming tools, the sandwich forming tool and the composite sandwich tube bending forming tool, it can be ensured that the composite sandwich tube can be paved and formed by a simple forming process, and at the same time, the thickness at the mold joint is uniform, which will not affect the mechanical properties of the mold joint, and its mechanical properties can be guaranteed, so that the preparation of the composite sandwich tube product is simple and easy, with low cost investment and high product quality, and can meet the preparation requirements of special-shaped composite tubes with large aspect ratio. This can solve the problem that the thickness of the traditional special-shaped composite bent pipe will be too thick at the mold joint during molding, which is easy to cause deviation, affect the mechanical properties of the mold joint, and cannot meet the preparation requirements of special-shaped composite pipe fittings with a large aspect ratio.

[0031] In one embodiment, the sandwich forming tool 10 includes a foaming inner core forming area arranged therein, which is used to perform a first foaming and hardening at room temperature on the foaming glue sprayed in the foaming inner core forming area to obtain the foaming inner core 31 of the sandwich elbow.

[0032] Specifically, Figure 2 As shown, the sandwich forming tool 10 comprises: an upper mold surface 11 of a sandwich mold body and a lower mold surface 12 of a sandwich mold body, wherein the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body are symmetrical, and the parting surface is the symmetrical surface of the special-shaped carbon tube.

[0033] A first molding area 111 is embedded in the lower surface of the upper mold surface 11 of the sandwich mold body. The shape of the first molding area 111 is consistent with the shape of the composite sandwich elbow 30 to be hardened and molded.

[0034] The upper surface of the lower mold surface 12 of the sandwich mold body is embedded with a second molding area 121, and the second molding area 121 is symmetrical with the first molding area 111. Figure 3 As shown in the figure, the lower surface of the upper mold surface 11 of the sandwich mold body is molded with the upper surface of the lower mold surface 12 of the sandwich mold body, and the first molding area 111 and the second molding area 121 are also symmetrically molded to form a foamed core molding area, and the foamed core molding area is used for spraying foam glue to harden and mold at room temperature to obtain the foamed core 31 of the sandwich elbow.

[0035] like Figure 2 , Figure 4 and Figure 5 As shown, the lower surface of the upper mold surface 11 of the sandwich mold body is provided with two first positioning modules 112 along the length direction. Correspondingly, the upper surface of the lower mold surface 12 of the sandwich mold body is also provided with two second positioning modules 122 along the length direction at positions corresponding to the lower surface of the upper mold surface 11 of the sandwich mold body. Figure 3 As shown), the two first positioning modules 112 are aligned with the second positioning modules 122 in the corresponding directions in sequence, so that the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body can be positioned when the sandwich mold body is closed, so that the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body can be accurately closed.

[0036] Specifically, Figure 4 and Figure 5 As shown, the first positioning module 112 includes a first positioning pin hole 1121 and a first positioning pin 1122; the first positioning pin hole 1121 is arranged along the length direction on the lower surface of the upper mold surface 11 of the sandwich mold body, and two first positioning pin holes 1121 are arranged along the length direction on the lower surface of the upper mold surface 11 of the sandwich mold body. The installation side of the first positioning pin 1122 is installed in the first positioning pin hole 1121.

[0037] For example, the first positioning pin 1122 includes a mounting side and an introduction side. The first positioning pin 1122 may be a diamond-shaped large-head positioning pin (eg Figure 4 As shown), it can also be a round large head positioning pin (as Figure 5 shown).

[0038] The second positioning module 122 includes a second positioning pin hole 1222, which is arranged along the length direction on the upper surface of the lower mold surface 12 of the sandwich mold body, and two second positioning pin holes 1222 are arranged along the length direction on the upper surface of the lower mold surface 12 of the sandwich mold body. When the upper mold surface 11 of the sandwich mold body is molded with the lower mold surface 12 of the sandwich mold body, the introduction side of the first positioning pin 1122 of the upper mold surface 11 of the sandwich mold body is installed in the second positioning pin hole 1222 of the lower mold surface 12 of the sandwich mold body.

[0039] Alternatively, if Figure 4 and Figure 5 As shown, the first positioning module 112 further includes a first bushing 1123 , which is embedded in the first positioning pin hole 1121 , and the mounting side of the first positioning pin 1122 is mounted in the first bushing 1123 to increase firmness.

[0040] The second positioning module 122 further includes a second bushing 1223, which is embedded in the second positioning pin hole 1222. When the upper mold surface 11 of the sandwich mold body is molded with the lower mold surface 12 of the sandwich mold body, the introduction side of the first positioning pin 1122 of the upper mold surface 11 of the sandwich mold body is installed in the second bushing 1223 to increase firmness.

[0041] like Figure 2 As shown, the upper mold surface 11 of the sandwich mold body is provided with first expanded holes 113 around it, and correspondingly, the lower mold surface 12 of the sandwich mold body is provided with first threaded holes 123 corresponding to the first expanded holes 113 at positions corresponding to the first expanded holes 113 of the upper mold surface 11 of the sandwich mold body.

[0042] After the upper mold surface 11 of the sandwich mold body is molded together with the lower mold surface 12 of the sandwich mold body, the first expanded hole 113 of the upper mold surface 11 of the sandwich mold body and the first threaded hole 123 of the lower mold surface 12 of the sandwich mold body are locked by using screws 90, so that the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body are firmly locked together.

[0043] like Figure 2 As shown, a first handle threaded hole 114 is respectively provided on the side surfaces at both ends in the length direction of the upper mold surface 11 of the sandwich mold body; the sandwich molding tool 10 also includes two first folding handles 13, and the two first folding handles 13 are fixed in the first handle threaded holes 114 of the upper mold surface 11 of the sandwich mold body by screws 90, so that by operating the two first folding handles 13, the upper mold surface 11 of the sandwich mold body can be lifted or raised, so that the upper mold surface 11 of the sandwich mold body can be more easily and conveniently molded or demolded with the lower mold surface 12 of the sandwich mold body.

[0044] like Figure 2 As shown, a first handle threaded hole 124 is respectively provided on the side surfaces at both ends in the length direction of the lower mold surface 12 of the sandwich mold body; the sandwich molding tooling 10 also includes two first double-bend handles 14, and the two first double-bend handles 14 are fixed in the first handle threaded holes 124 of the upper mold surface 11 of the sandwich mold body by screws 90. In this way, by operating the two first double-bend handles 14, the sandwich molding tooling 10 after the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body are molded together can be lifted or raised.

[0045] The four corners of the upper surface of the sandwich mold body upper mold surface 11 are each provided with a first lifting ring hole (not shown). In this way, the machine can be operated to lift the sandwich mold body upper mold surface 11 through the four first lifting ring lifting holes using lifting rings, so that the sandwich mold body upper mold surface 11 can be molded or demolded with the sandwich mold body lower mold surface 12 more easily and conveniently, and labor is saved, and the mold closing or demolding efficiency is high.

[0046] A second lifting ring hole (not shown) is provided at each of the four corners of the upper surface of the sandwich mold body lower mold surface 12. In this way, the machine can be operated to lift the sandwich mold body upper mold surface 11 through the four second lifting ring lifting holes using lifting rings, so that the sandwich mold body upper mold surface 11 can be molded or demolded with the sandwich mold body lower mold surface 12 more easily and conveniently, and labor is saved, and the mold closing or demolding efficiency is high.

[0047] The periphery of the first molding area 111 of the upper mold surface 11 of the sandwich mold body and the periphery of the second molding area 121 of the lower mold surface 12 of the sandwich mold body are engraved with product boundary lines and process allowance lines.

[0048] Generally speaking, the product boundary line is the final molding size of the part. Cutting is performed according to the product boundary line, and the cut-off part is the excess part outside the product boundary line. The process allowance line is the boundary line formed by the extra paving of carbon fiber prepreg. By setting the product boundary line and the process allowance line, the boundary of the hardened and molded product parts and the smoothness of the product parts can be guaranteed.

[0049] In the utility model, the foam glue sprayed in the foam core molding area is foamed and hardened for the first time at room temperature through the sandwich molding tool 10 to obtain the foam core of the sandwich elbow, so that the foam core molding process of the sandwich elbow is simple, the thickness at the mold closing point is uniform, and the mechanical properties of the mold closing point will not be affected, so its mechanical properties can be guaranteed.

[0050] In one embodiment, the composite sandwich tube bending forming tool 20 includes a composite sandwich tube bending forming area disposed therein, which is used to foam and harden the sandwich tube 32 contained in the composite sandwich tube bending forming area after the composite material 33 is laid on the outer surface of the foamed inner core 31 for the second time under high temperature to obtain the composite sandwich tube bending 30. The width of the foamed inner core forming area inside the sandwich forming tool 10 is smaller than the width of the composite sandwich tube bending forming area inside the composite sandwich tube bending forming tool 20, and the difference between the widths is the thickness of the composite material 33 laid on the outer surface of the foamed inner core 31.

[0051] The structure of the composite material sandwich tube bending tool 20 is similar to that of the sandwich tool 10 .

[0052] Specifically, Figure 6 As shown, the composite sandwich tube bending forming tool 20 includes: an upper mold surface 21 of a composite carbon part mold and a lower mold surface 22 of a composite carbon part mold, wherein the length of the upper mold surface 21 of the composite carbon part mold can be equal to or less than the length of the lower mold surface 22 of the composite carbon part mold, and the width of the upper mold surface 21 of the composite carbon part mold can be equal to or less than the width of the lower mold surface 22 of the composite carbon part mold.

[0053] A third molding area 211 is embedded in the lower surface of the upper mold surface 21 of the composite carbon part mold body. The shape of the third molding area 211 is consistent with the shape of the hardened composite sandwich elbow 30. The third molding area 211 is larger than the first molding area 111 of the upper mold surface 11 of the sandwich mold body. The width difference between the third molding area 211 and the first molding area 111 of the upper mold surface 11 of the sandwich mold body depends on the thickness of the composite material paved on the outer surface of the foamed core 31, and the width difference is slightly larger than the thickness of the composite material.

[0054] The upper surface of the composite carbon mold body lower mold surface 22 is embedded with a fourth molding area 221, the fourth molding area 221 is larger than the second molding area 121 of the sandwich mold body lower mold surface 12, and the fourth molding area 221 is symmetrical with the third molding area 211. Fig.10 and Fig.11 As shown in FIG. 2 ), the lower surface of the upper mold surface 21 of the composite carbon component mold body is molded with the upper surface of the lower mold surface 22 of the composite carbon component mold body, and the third molding area 211 and the fourth molding area 221 are also symmetrically molded to form a composite sandwich elbow molding area, which is used to accommodate the sandwich tube 32 (as shown in FIG. 2 ) after the composite material 33 is laid on the outer surface of the foamed inner core 31. Fig. 9 As shown), the composite sandwich elbow 30 is obtained by foaming and hardening under high temperature.

[0055] like Figures 6 to 8 As shown, the lower surface of the upper mold surface 21 of the composite carbon part mold body is provided with two third positioning modules 212 along the length direction. Correspondingly, the upper surface of the lower mold surface 22 of the composite carbon part mold body is also provided with two fourth positioning modules 222 along the length direction at positions corresponding to the lower surface of the upper mold surface 21 of the composite carbon part mold body. When the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body are molded together, the two third positioning modules 212 are aligned with the fourth positioning modules 222 in the corresponding direction in sequence, so that the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body can be positioned when the composite carbon part mold body is molded together, so that the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body can be molded accurately.

[0056] Specifically, Figure 7 and Figure 8 As shown, the third positioning module 212 includes a third positioning pin hole 2121 and a third positioning pin 2122; the third positioning pin hole 2121 is arranged along the length direction on the lower surface of the upper mold surface 21 of the composite carbon mold body, and two third positioning pin holes 2121 are arranged on the lower surface of the upper mold surface 21 of the composite carbon mold body along the length direction. The installation side of the third positioning pin 2122 is installed in the third positioning pin hole 2121.

[0057] For example, the third positioning pin 2122 includes a mounting side and an introduction side. The third positioning pin 2122 may be a diamond-shaped large-head positioning pin (eg Figure 7 As shown), it can also be a round large head positioning pin (as Figure 8 shown).

[0058] The fourth positioning module 222 includes a fourth positioning pin hole 2222, which is arranged along the length direction on the upper surface of the lower mold surface 22 of the composite carbon part mold body, and two fourth positioning pin holes 2222 are arranged on the upper surface of the lower mold surface 22 of the composite carbon part mold body along the length direction. When the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body are molded together, the introduction side of the third positioning pin 2122 of the upper mold surface 21 of the composite carbon part mold body is installed in the fourth positioning pin hole 2222 of the lower mold surface 22 of the composite carbon part mold body.

[0059] Alternatively, if Figure 7 and Figure 8 As shown, the third positioning module 212 also includes a third bushing 2123, which is embedded in the third positioning pin hole 2121, and the installation side of the third positioning pin 2122 is installed in the third bushing 2123 to ensure the positioning and mold closing of the upper mold surface 21 of the composite carbon part mold and the lower mold surface 22 of the composite carbon part mold to increase firmness.

[0060] The fourth positioning module 222 also includes a fourth bushing 2223, which is embedded in the fourth positioning pin hole 2222. When the upper mold surface 21 of the composite carbon part mold body is molded with the lower mold surface 22 of the composite carbon part mold body, the introduction side of the third positioning pin 2122 of the upper mold surface 21 of the composite carbon part mold body is installed in the fourth bushing 2223 to ensure the positioning and molding of the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body, thereby increasing firmness.

[0061] like Figure 6 As shown, the upper mold surface 21 of the composite carbon mold body is provided with second expanded holes 213 around it, and correspondingly, the lower mold surface 22 of the composite carbon mold body is provided with second threaded holes 223 corresponding to the second expanded holes 213 at positions corresponding to the second expanded holes 213 of the upper mold surface 21 of the composite carbon mold body.

[0062] After the upper mold surface 21 of the composite carbon part mold body is molded together with the lower mold surface 22 of the composite carbon part mold body, the second expanded hole 213 of the upper mold surface 21 of the composite carbon part mold body and the second threaded hole 223 of the lower mold surface 22 of the composite carbon part mold body are locked by using screws 90, so that the upper mold surface 21 of the composite carbon part mold body and the lower mold surface 22 of the composite carbon part mold body are firmly locked together.

[0063] like Figure 6As shown, a second handle threaded hole 214 is respectively provided on both end sides of the length direction of the upper mold surface 21 of the composite carbon part mold body; the composite sandwich tube bending forming tool 20 also includes two second folding handles 23, and the two second folding handles 23 are fixed in the second handle threaded holes 214 of the upper mold surface 21 of the composite carbon part mold body by screws 90. In this way, by operating the two second folding handles 23, the upper mold surface 21 of the composite carbon part mold body can be lifted or raised, so that the upper mold surface 21 of the composite carbon part mold body can be more easily and conveniently molded or demolded with the lower mold surface 22 of the composite carbon part mold body.

[0064] like Figure 6 As shown, a second handle threaded hole 224 is respectively provided on the side surfaces at both ends in the length direction of the lower mold surface 12 of the sandwich mold body; the composite material sandwich tube bending forming tooling 20 also includes two second double-bend handles 24, and the two second double-bend handles 24 are fixed in the second handle threaded holes 224 of the upper mold surface 11 of the sandwich mold body by screws 90. In this way, by operating the two second double-bend handles 24, the composite material sandwich tube bending forming tooling 20 after the upper mold surface 11 of the sandwich mold body and the lower mold surface 12 of the sandwich mold body are molded together can be lifted or raised.

[0065] A third lifting ring hole (not shown) is provided at each of the four corners of the upper surface of the composite carbon part mold body upper mold surface 21. In this way, the machine can be operated to lift the composite carbon part mold body upper mold surface 21 through the four third lifting ring holes using lifting rings, so that the composite carbon part mold body upper mold surface 21 can be molded or demolded with the composite carbon part mold body lower mold surface 22 more easily and conveniently, and labor is saved, and the mold closing or demolding efficiency is high.

[0066] A fourth lifting ring hole 225 is provided at each of the four corners of the upper surface of the lower mold surface 22 of the composite carbon mold body. In this way, the machine can be operated to lift the lower mold surface 22 of the composite carbon mold body using the lifting ring through the four fourth lifting ring lifting holes, so that the entire composite sandwich tube bending forming tool 20 can be lifted more conveniently and labor-savingly.

[0067] like Figure 6 As shown, product boundary lines and process allowance lines 28 are engraved around the third molding area 211 of the upper mold surface 21 of the composite carbon component mold body and around the fourth molding area 221 of the lower mold surface 22 of the composite carbon component mold body.

[0068] Generally speaking, the product boundary line is the final molding size of the part. Cutting is performed according to the product boundary line, and the cut-off part is the excess part outside the product boundary line. The process allowance line is the boundary line formed by the extra paving of carbon fiber prepreg. By setting the product boundary line and the process allowance line, the boundary of the hardened and molded product parts and the smoothness of the product parts can be guaranteed.

[0069] like Fig. 9As shown, after the foam glue sprayed in the foam core molding area is foamed and hardened at room temperature for the first time by the sandwich molding tool 10 to obtain the foam core 31 of the sandwich elbow, the composite material 33 is laid on the outer surface of the foam core 31 to obtain the sandwich pipe 32. The composite material 33 includes a glue film and pre-impregnated fibers or fabric pre-impregnated materials laid in sequence.

[0070] like Fig. 9 and Fig.10 As shown, in the sandwich tube 32, the sandwich tube 32 is a tubular structure with two ends bent and a straight section in the middle. The straight section in the middle is provided with two symmetrical through holes 35, which are bonding holes for the small carbon tubes 34 and are used for bonding the small carbon tubes 34.

[0071] Fig.10 The figure is a schematic diagram of the mold closing at the torsion resistance part of the composite sandwich bending forming tool 20. Fig.10 In the figure, the sandwich tube 32 is located in the composite material sandwich tube bending forming area of ​​the composite material sandwich tube bending forming tool 20.

[0072] Fig.11 The figure is a schematic diagram of the mold closing of the composite sandwich tube bending forming tool 20. Fig.11 In the process, the sandwich pipe 32 is foamed and hardened for the second time under high temperature to obtain the composite sandwich elbow 30.

[0073] Fig.12 It is a structural schematic diagram of a composite material sandwich elbow 30 obtained by using a composite material sandwich elbow forming tool 20; Fig.13 It is a schematic diagram of a cross-sectional view of a composite sandwich tube bend 30 obtained by using a composite sandwich tube bend forming tool 20 .

[0074] In this embodiment, the outer surface of the foamed inner core is paved with a rubber film and pre-impregnated fibers or fabric pre-impregnated materials in sequence, and then the composite sandwich bent tube 30 is foamed and hardened for the second time under high temperature by the composite sandwich bent tube forming tool 20. Thus, it can be ensured that the composite sandwich bent tube can be paved and formed by a simple forming process, and the thickness at the mold joint is uniform, which will not affect the mechanical properties of the mold joint, and its mechanical properties can be guaranteed, and the preparation requirements of special-shaped composite pipes with large aspect ratio can be met.

[0075] Based on the same concept, in one embodiment, Fig.14 As shown, the utility model provides a composite material sandwich tube bending forming method, which is applied to the composite material sandwich tube bending forming equipment described in any of the above embodiments, and the composite material sandwich tube bending forming equipment includes a sandwich forming tool and a composite material sandwich tube bending forming tool; the composite material sandwich tube bending forming method includes:

[0076] S1. Spraying foam glue on the foam core molding area inside the sandwich molding tooling;

[0077] S2, foaming and hardening the foamed glue in the foamed inner core molding area at room temperature for the first time to obtain the foamed inner core of the sandwich elbow;

[0078] S3, laying composite material on the outer surface of the foamed inner core to obtain a sandwich pipe;

[0079] S4, accommodating the sandwich tube in a composite material sandwich tube bending forming area inside a composite material sandwich tube bending forming tool, and performing a second foaming and hardening forming process at a high temperature to obtain a composite material sandwich tube bending.

[0080] In this embodiment, a composite sandwich bend forming method is provided, including: spraying foam glue on the foam core forming area inside the sandwich forming tool; foaming and hardening the foam glue in the foam core forming area at room temperature for the first time to obtain the foam core of the sandwich bend; paving composite materials on the outer surface of the foam core to obtain a sandwich pipe fitting; accommodating the sandwich pipe fitting in the composite sandwich bend forming area inside the composite sandwich bend forming tool, and foaming and hardening the composite sandwich bend for the second time under high temperature to obtain the composite sandwich bend. Thereby, it can be ensured that the composite sandwich bend can be paved and formed by a simple forming process, and at the same time, the thickness at the mold joint is uniform, which will not affect the mechanical properties of the mold joint, and its mechanical properties can be guaranteed, so that the preparation of the composite sandwich bend product is simple and easy, with low cost investment and high product quality, and can meet the preparation requirements of special-shaped composite pipe fittings with large aspect ratio. This can solve the problem that the thickness of the traditional special-shaped composite bent pipe will be too thick at the mold joint during molding, which is easy to cause deviation, affect the mechanical properties of the mold joint, and cannot meet the preparation requirements of special-shaped composite pipe fittings with a large aspect ratio.

[0081] In one embodiment, before step S1, the composite material sandwich elbow forming method further includes: preparing a sandwich forming tool, cleaning a foamed inner core forming area of ​​the sandwich forming tool and applying a demoulding material on the surface.

[0082] In one embodiment, after step S1 and before step S2, the composite sandwich tube bending forming method further includes: locking the sandwich forming tool, specifically including:

[0083] Align the introduction side of the first locating pin on the upper mold surface of the sandwich mold body with the second locating pin hole on the lower mold surface of the sandwich mold body, and install the introduction side of the first locating pin on the upper mold surface of the sandwich mold body in the second locating pin hole on the lower mold surface of the sandwich mold body;

[0084] The first expanded holes around the upper mold surface of the sandwich mold body and the first threaded holes corresponding to the lower mold surface of the sandwich mold body are locked with screws, and the upper mold surface of the sandwich mold body and the lower mold surface of the sandwich mold body are firmly locked together.

[0085] In one embodiment, before step S3, the composite sandwich elbow forming method further comprises: trimming and cutting the formed foamed inner core according to the process allowance line, and the cut-off part is the excess part outside the process allowance line.

[0086] In one embodiment, in step S3, laying composite material on the outer surface of the foamed inner core to obtain a sandwich tube, comprising:

[0087] The composite material is laid on the outer surface of the trimmed and cut foamed inner core to obtain a sandwich elbow; wherein the composite material includes a glue film and pre-impregnated fibers or fabric pre-impregnated materials laid in sequence.

[0088] Structural adhesive is applied to two small carbon tubes in the sandwich bending tube and fixed, and they are positioned by the third positioning module on the upper die surface of the composite carbon part mold body and the fourth positioning module on the lower die surface of the composite carbon part mold body of the composite sandwich bending tube forming tooling.

[0089] In one embodiment, after step S3 and before step S4, the composite sandwich tube bending forming method further includes:

[0090] The sandwich pipe bending machine with the composite material laid on it is moved to the composite material sandwich pipe bending forming tooling;

[0091] The locking composite sandwich tube bending forming tooling specifically includes:

[0092] Align the introduction side of the third locating pin on the upper die surface of the composite carbon part mold body with the fourth locating pin hole on the lower die surface of the composite carbon part mold body, and install the introduction side of the third locating pin on the upper die surface of the composite carbon part mold body in the fourth locating pin hole on the lower die surface of the composite carbon part mold body;

[0093] The second expanded holes around the upper mold surface of the composite carbon part mold body and the second threaded holes corresponding to the lower mold surface of the composite carbon part mold body are locked with screws to firmly lock the upper mold surface of the composite carbon part mold body and the lower mold surface of the composite carbon part mold body together.

[0094] In one embodiment, in step S4, the sandwich tube is accommodated in a composite sandwich tube forming area inside a composite sandwich tube forming tool, and foamed and hardened at a high temperature to obtain a composite sandwich tube; specifically comprising:

[0095] Use sealing tape to stick a vacuum bag around the lower mold surface of the composite carbon part mold body and evacuate the bag;

[0096] After the vacuum is evacuated, it is sent to the autoclave for heating and curing. The foamed inner core is foamed for the second time at high temperature and is cured and formed integrally with the composite material on its outer surface. After molding, it is demoulded to obtain a composite material sandwich elbow.

[0097] In one embodiment, after step S4, the composite sandwich elbow forming method further includes: cutting and correcting the formed composite sandwich elbow along the product line, and then grinding and polishing the whole. The formed composite sandwich elbow is trimmed and cut along the product boundary line, and the cut portion is the excess portion outside the boundary line of the cured composite sandwich elbow and the foamed inner core product.

[0098] It should be noted that the above-mentioned composite material sandwich tube bending forming method embodiment and the composite material sandwich tube bending forming equipment embodiment belong to the same concept, and the specific implementation process is detailed in the composite material sandwich tube bending forming equipment embodiment, and the technical features in the composite material sandwich tube bending forming equipment embodiment are correspondingly applicable in the above-mentioned composite material sandwich tube bending forming method embodiment, which will not be repeated here.

[0099] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0100] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite material sandwich tube bending forming equipment, characterized in that: include: Sandwich forming tooling and composite sandwich tube bending forming tooling, including: The sandwich forming tool comprises a foaming inner core forming area arranged inside the tool, which is used to foam and harden the foam glue sprayed in the foaming inner core forming area at room temperature for the first time to obtain the foaming inner core of the sandwich elbow; The composite sandwich tube bending forming tooling includes a composite sandwich tube bending forming area arranged inside the tooling, which is used to perform a second foaming and hardening forming of the sandwich tube part contained in the composite sandwich tube bending forming area after the composite material is laid on the outer surface of the foaming inner core under high temperature to obtain a composite sandwich tube bending.

2. The composite sandwich tube bending forming equipment according to claim 1, characterized in that: The sandwich forming tooling comprises: an upper mold surface of a sandwich mold body and a lower mold surface of a sandwich mold body, wherein the upper mold surface of the sandwich mold body and the lower mold surface of the sandwich mold body are symmetrical; A first molding area is embedded in the lower surface of the upper mold surface of the sandwich mold body, and a second molding area is embedded in the upper surface of the lower mold surface of the sandwich mold body, and the second molding area is symmetrical to the first molding area; When the upper mold surface of the sandwich mold body is molded with the lower mold surface of the sandwich mold body, the first molding area and the second molding area are symmetrically molded to form the foamed inner core molding area.

3. The composite sandwich tube bending forming equipment according to claim 2, characterized in that: The lower surface of the upper mold surface of the sandwich mold body is provided with two first positioning modules along the length direction; the upper surface of the lower mold surface of the sandwich mold body is provided with two second positioning modules at positions corresponding to the lower surface of the upper mold surface of the sandwich mold body; When the upper mold surface of the sandwich mold body is molded with the lower mold surface of the sandwich mold body, the first positioning module is aligned with the second positioning module in the corresponding direction in sequence to enable the upper mold surface of the sandwich mold body to be molded accurately with the lower mold surface of the sandwich mold body.

4. The composite sandwich tube bending forming equipment according to claim 3, characterized in that: The first positioning module comprises a first positioning pin hole and a first positioning pin, and the mounting side of the first positioning pin is mounted in the first positioning pin hole; The second positioning module comprises a second positioning pin hole. When the upper mold surface of the sandwich mold body is molded with the lower mold surface of the sandwich mold body, the introduction side of the first positioning pin on the upper mold surface of the sandwich mold body is installed in the second positioning pin hole.

5. The composite sandwich tube bending forming equipment according to claim 4, characterized in that: The first positioning module further includes a first bushing, the first bushing is embedded in the first positioning pin hole, and the mounting side of the first positioning pin is mounted in the first bushing; The second positioning module also includes a second bushing, which is embedded in the second positioning pin hole; when the upper mold surface of the sandwich mold body and the lower mold surface of the sandwich mold body are molded together, the introduction side of the first positioning pin is installed in the second bushing.

6. The composite sandwich tube bending forming equipment according to claim 2, characterized in that: The upper mold surface of the sandwich mold body is provided with first expanded holes around it; the lower mold surface of the sandwich mold body is provided with first threaded holes corresponding to the first expanded holes at positions corresponding to the first expanded holes.

7. The composite sandwich tube bending forming equipment according to claim 1, characterized in that: The composite sandwich bending tube forming tool comprises: an upper die surface of a composite carbon mold body and a lower die surface of a composite carbon mold body; a third forming area is embedded in the lower surface of the upper die surface of the composite carbon mold body, and a fourth forming area is embedded in the upper surface of the lower die surface of the composite carbon mold body, and the fourth forming area is symmetrical to the third forming area; When the upper mold surface of the composite carbon component mold body and the lower mold surface of the composite carbon component mold body are molded together, the third molding area and the fourth molding area are molded together symmetrically to form a composite material sandwich elbow molding area.

8. The composite sandwich tube bending forming equipment according to claim 7, characterized in that: The lower surface of the upper mold surface of the composite carbon part mold body is provided with two third positioning modules along the length direction; the upper surface of the lower mold surface of the composite carbon part mold body is provided with two fourth positioning modules at positions corresponding to the lower surface of the upper mold surface of the composite carbon part mold body; When the upper mold surface of the composite carbon part mold body is molded with the lower mold surface of the composite carbon part mold body, the third positioning module is aligned with the fourth positioning module in the corresponding direction in sequence to enable the upper mold surface of the composite carbon part mold body to be molded accurately with the lower mold surface of the composite carbon part mold body.

9. The composite sandwich tube bending forming equipment according to claim 8, characterized in that: The third positioning module comprises a third positioning pin hole and a third positioning pin, and the installation side of the third positioning pin is installed in the third positioning pin hole; The fourth positioning module comprises a fourth positioning pin hole, and when the upper mold surface of the composite carbon component mold body and the lower mold surface of the composite carbon component mold body are molded together, the introduction side of the third positioning pin is installed in the fourth positioning pin hole.

10. The composite sandwich tube bending forming equipment according to claim 9, characterized in that: The third positioning module further includes a third bushing, the third bushing is embedded in the third positioning pin hole, and the mounting side of the third positioning pin is mounted in the third bushing; The fourth positioning module also includes a fourth bushing, which is embedded in the fourth positioning pin hole; when the upper mold surface of the composite carbon part mold body and the lower mold surface of the composite carbon part mold body are molded together, the introduction side of the third positioning pin is installed in the fourth bushing.

11. The composite sandwich tube bending forming equipment according to claim 7, characterized in that: Second expanded holes are formed around the upper mold surface of the composite carbon component mold body, and second threaded holes corresponding to the second expanded holes are formed on the lower mold surface of the composite carbon component mold body at positions corresponding to the second expanded holes.

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