Hot oil pressing forming device and method for composite material parts

Abstract

The present invention discloses a hot oil pressure forming device for composite parts, which includes an upper mold body, a composite product, a hot pressing bag, a lower mold body, a control system, an oil temperature system, a built-in counter-pressure piece, an upper mounting block, a lower mounting block, a sealing nut, and an external joint. The composite product is laid in a closed cavity formed by the upper mold body and the lower mold body, and the hot pressing bag is provided on the inner side wall of the composite product. The device is characterized in that: the outer end of the built-in counter-pressure piece is provided with an external thread, the sealing nut has an internal thread and is connected to the external thread of the outer end of the built-in counter-pressure piece, the external joint is connected to the oil temperature system through an oil pipe, and the control system is used to monitor the oil pressure temperature and pressure of the hot pressing bag in real time during the curing process, and adjust the heating and pressurizing rate in the oil temperature system in real time according to the feedback result. The present invention ensures that high-temperature and high-pressure oil will not leak during the forming process, and the qualified rate in terms of dimensional accuracy and lossless quality is greatly improved, thereby ensuring the stability of the quality of the composite product.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material parts / workpiece forming, and in particular to a hot oil pressure forming device and method for composite material parts. Background Art

[0002] Composite material molding technology is the foundation and condition for the development of the composite material industry. In the aerospace industry, with the expansion of the application fields of composite materials, the application of composite materials has developed rapidly. Its original molding processes are mainly autoclave molding, compression molding, vacuum bag molding, RTM molding, and winding molding. Although these molding processes can produce qualified products, each process scheme has its shortcomings.

[0003] In recent years, hot oil pressing technology has begun to be applied to composite material forming processes. However, existing hot oil pressing devices / methods have problems such as unstable hot oil pressure control and poor sealing. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hot oil pressing forming device and method for composite parts. Through the design of the first sealing component and the second sealing component, it is possible to prevent leakage between the built-in back-pressure part and the hot pressing bag under abnormal working conditions or accidental situations, and to prevent leakage at the threaded connection under abnormal working conditions or accidental situations, thereby enhancing the sealing effect, ensuring that high-temperature and high-pressure oil will not leak during the forming process, ensuring safety and reliability during the operation process, and greatly improving the qualified rate in terms of dimensional accuracy, lossless quality, etc., thereby ensuring the stability of the quality of composite products.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A hot oil pressing molding device for composite material parts, comprising an upper mold body (1), a composite material product (2), a hot pressing bag (3), a lower mold body (4), a control system (5), an oil temperature system (6), a built-in counter-pressure piece (7), an upper mounting block (8), a lower mounting block (9), a sealing nut (10), and an external joint (11); the composite material product is laid in a closed mold cavity formed by the upper mold body and the lower mold body, and the hot pressing bag is provided on the inner side wall of the composite material product; the device is characterized in that: the inner side wall of the hot pressing bag is provided with a built-in counter-pressure piece, the outer peripheral side of the upper mold body is provided with an upper mounting block, the outer peripheral side of the lower mold body is provided with a lower mounting block, and the upper mounting block and the lower mounting block are provided with a sealing nut (10), and ... upper mounting block and the lower mounting block are provided with a sealing nut (11), and the upper mounting block and the lower mounting block are provided with a sealing nut (10), and the device is characterized in that: the upper mounting block and the lower mounting block are provided with a sealing nut (10), and the upper mounting block and the lower mounting block are provided with a sealing nut (11) A mounting hole is formed between them, and the neck of the built-in counter-pressure piece and the hot pressing bag are installed in the mounting hole. The outer end of the built-in counter-pressure piece is provided with an external thread, and the sealing nut has an internal thread and is connected to the external thread of the outer end of the built-in counter-pressure piece. The other end of the sealing nut is connected with an external joint, and the external joint is connected to the oil temperature system through an oil pipe; the oil temperature system is connected to the hot pressing bag through an oil inlet pipe and an oil return pipe, and the control system is connected to the oil temperature system and the hot pressing bag. The oil temperature system includes a heating device and a pressurizing device. The control system is used to monitor the oil pressure temperature and pressure of the hot pressing bag during the curing process in real time, and adjust the heating and pressurizing rates in the oil temperature system in real time according to the feedback results.

[0007] Furthermore, after the composite material prepreg is laid on the upper and lower mold bodies, a customized hot pressing bag is placed and connected to a heating device and a pressurizing device, and the composite product is cured using circulating high-temperature, high-pressure hot oil; the curing process curve of the composite product is preset in the control system, and the oil temperature system is controlled to perform heating and pressurizing operations according to the preset program, and the heating and pressurizing rates in the oil temperature system are adjusted in real time based on the real-time monitoring of the oil pressure temperature and pressure feedback of the hot pressing bag during the curing process.

[0008] Furthermore, a mounting groove (14) is provided in the mounting hole, a first sealing assembly (12) is installed in the mounting groove, a second sealing assembly (13) is provided in the sealing nut (10), the first sealing assembly includes a first sealing element (15), a first spring 916, and a pressure ring (17), the first sealing element, the first spring, and the pressure ring are sleeved on the outer peripheral surface of the built-in counter-pressure piece, the left end surface of the first sealing element abuts and is sealedly connected to the right end surface of the neck of the hot pressing bag (3), the inner peripheral surface of the first sealing element abuts and is sealedly connected to the outer peripheral surface of the built-in counter-pressure piece (7), one end of the first spring abuts the first sealing element, the other end abuts the pressure ring, the other end of the pressure ring abuts the second sealing assembly, and when the sealing nut is screwed onto the built-in counter-pressure piece, the pressure ring can move left and right.

[0009] Furthermore, the second sealing assembly (13) includes a moving ring (18), an arc-shaped moving block (19), a second spring (20), and a second sealing element (21). The moving ring can be slidably arranged in the first sliding groove. The left end of the moving ring abuts against the pressure ring (17). The right end of the moving ring has a first inclined surface / conical surface. One end of the arc-shaped moving block has a second inclined surface / conical surface. The first inclined surface and the second inclined surface are slidably matched. The other end of the arc-shaped moving block is connected to the second spring. The other end of the second spring is connected to the second sealing element. The other end of the second sealing element abuts and is sealedly connected to the external threaded surface of the built-in counter-pressure piece (7). The arc-shaped moving block, the second spring, and the second sealing element are installed in the second sliding groove. The first sliding groove and the second sliding groove are vertically arranged.

[0010] Furthermore, when the sealing nut (10) is screwed onto the external thread of the built-in counter-pressure member (7), the pressure ring (17) acts as an intermediate force transmission member, so that the first spring (16) is compressed and presses the first sealing element (15), thereby enhancing the sealing effect; at the same time, the moving ring (18) moves to the right, so that the first inclined surface squeezes the second inclined surface, so that the arc-shaped moving block (19) moves radially inward, thereby pressing the second sealing element (21), thereby enhancing the sealing effect.

[0011] A hot oil pressing forming method for composite material parts, comprising the following steps:

[0012] Step S1: Laying composite material prepreg on the upper mold body (1) and the lower mold body (4);

[0013] Step S2: After the composite product is laid, the hot pressing bag (3) is placed on the lower mold body, and then the upper mold body is assembled to the lower mold body, and is positioned and pressed by pins or bolts;

[0014] Step S3: Installing the first sealing assembly (12) and the sealing nut (10);

[0015] Step S4: setting a preset curing program for the composite product in the control system (6);

[0016] Step S5: The oil temperature system heats, pressurizes and circulates the hot-pressed oil according to the curing program in the control system (5). The control system is used to monitor the oil pressure temperature and pressure of the hot-pressed bag in real time during the curing process, and adjusts the heating and pressurizing rates in the oil temperature system in real time according to the feedback results.

[0017] The hot oil pressing forming device and method of a composite material part of the present invention can prevent the possibility of leakage between the built-in counter-pressure part and the hot pressing bag under abnormal working conditions or accidental circumstances through the design of the first sealing component and the second sealing component. It can also prevent the possibility of leakage at the threaded connection under abnormal working conditions or accidental circumstances, enhance the sealing effect, ensure that high-temperature and high-pressure oil will not leak during the forming process, ensure safety and reliability during the operation process, greatly improve the qualified rate of dimensional accuracy, lossless quality and other aspects, and ensure the stability of the quality of composite products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first cross-sectional structure of the hot oil pressing forming device for composite material parts of the present invention;

[0019] Figure 2 This is a schematic diagram of the second cross-sectional structure of the hot oil pressing forming device for composite material parts of the present invention;

[0020] Figure 3 This is a schematic diagram of the second cross-sectional structure of the hot oil pressing forming device for composite parts of the present invention.

[0021] In the figure: upper mold body 1, composite product 2, hot pressing bag 3, lower mold body 4, control system 5, oil temperature system 6, built-in counter-pressure part 7, upper mounting block 8, lower mounting block 9, sealing nut 10, external joint 11, first sealing assembly 12, second sealing assembly 13, mounting groove 14, first sealing element 15, first spring 16, pressure ring / transfer ring 17, moving ring 18, arc-shaped moving block 19, second spring 20, second sealing element 21, thread T. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] like Figure 1-3As shown, a hot oil pressing forming device for composite parts includes an upper mold body 1, a composite product 2, a hot pressing bag 3, a lower mold body 4, a control system 5, an oil temperature system 6, a built-in counter-pressure piece 7, an upper mounting block 8, a lower mounting block 9, a sealing nut 10, and an external joint 11. The composite product 2 is laid in the closed mold cavity formed by the upper mold body 1 and the lower mold body 4, and a hot pressing bag 3 (customized hot pressing bag) is provided on the inner wall of the composite product 2; it is characterized in that: the inner wall of the hot pressing bag 3 is provided with a built-in counter-pressure piece 7, the outer peripheral side of the upper mold body 1 is installed with an upper mounting block 8, the outer peripheral side of the lower mold body 4 is installed with a lower mounting block 9, a mounting hole is formed between the upper mounting block 8 and the lower mounting block 9, and the inner The counter-pressure piece 7 and the neck of the hot pressing bag 3 are installed in the mounting hole, the outer end of the built-in counter-pressure piece 7 is provided with an external thread, the sealing nut 10 has an internal thread and is connected to the external thread of the outer end of the built-in counter-pressure piece 7, the other end of the sealing nut 10 is connected to the external joint 11, and the external joint 11 is connected to the oil temperature system 6 through an oil pipe; the oil temperature system 6 is connected to the hot pressing bag 3 through an oil inlet pipe and an oil return pipe, the control system 5 is connected to the oil temperature system 6 and the hot pressing bag 3, the oil temperature system 6 includes a heating device and a pressurizing device, the control system 5 is used to monitor the oil pressure temperature and pressure of the hot pressing bag 3 during the curing process in real time, and adjust the heating and pressurizing rates in the oil temperature system 6 in real time according to the feedback results.

[0025] After the composite prepreg is laid on the upper and lower molds, a customized hot press bag 3 is placed and connected to a heating and pressurizing device. The composite product is cured using circulating high-temperature, high-pressure hot oil. The control system 5 presets a curing process curve for the composite product, and controls the heating and pressurizing steps of the oil temperature system 6 according to a preset program. The heating and pressurizing rates of the oil temperature system 6 are adjusted in real time based on real-time monitoring of the oil pressure temperature and pressure feedback from the hot press bag 3 during the curing process.

[0026] This invention uses oil heating and pressurization to minimize heat loss. The composite product's curing process requires high heating and pressurization rates, making the manufacturing process more energy-efficient than existing molding processes. The finished product also significantly improves the pass rate in terms of dimensional accuracy and lossless quality. This molding tooling also addresses the issue of uniform curing temperature for guide-shaped cavity composite parts in other molding processes, as well as the issue of curing pressure, ensuring the quality of the molding and curing of such parts.

[0027] like Figure 2-3As shown, further, a mounting groove 14 is provided in the mounting hole, a first sealing assembly 12 is installed in the mounting groove 14, a second sealing assembly 13 is provided in the sealing nut 10, the first sealing assembly 12 includes a first sealing element 15, a first spring 16, a pressure ring / transfer ring 17, the first sealing element 15, the first spring 16, and the pressure ring 17 are sleeved on the outer peripheral surface of the built-in counter-pressure part 7, the left end face of the first sealing element 15 abuts and is sealedly connected to the right end face of the neck of the hot pressing bag 3, the inner peripheral surface of the first sealing element 15 abuts and is sealedly connected to the outer peripheral surface of the built-in counter-pressure part 7, one end of the first spring 16 abuts against the first sealing element 15, and the other end abuts against the pressure ring 17, the other end of the pressure ring 17 abuts against the second sealing assembly 13, and when the sealing nut 10 is screwed onto the built-in counter-pressure part 7, the pressure ring 17 can move left and right.

[0028] The second sealing assembly 13 includes a moving ring 18, an arc-shaped moving block 19, a second spring 20, and a second sealing element 21. The moving ring 18 is slidably arranged in the first sliding groove. The left end of the moving ring 18 abuts against the pressure ring 17. The right end of the moving ring 18 has a first inclined surface / conical surface. One end of the arc-shaped moving block 19 has a second inclined surface / conical surface. The first inclined surface and the second inclined surface are slidably matched. The other end of the arc-shaped moving block 19 is connected to the second spring 20. The other end of the second spring 20 is connected to the second sealing element 21. The other end of the second sealing element 21 abuts and is sealedly connected to the external threaded surface of the built-in back pressure member 7. The arc-shaped moving block 19, the second spring 20, and the second sealing element 21 are installed in the second sliding groove. The first sliding groove and the second sliding groove are arranged vertically.

[0029] When the sealing nut 10 is screwed onto the external thread of the built-in counter-pressure piece 7, the pressure ring 17 acts as an intermediate force transmission piece, so that the first spring 16 is compressed and presses the first sealing element 15, which can prevent the possibility of leakage between the built-in counter-pressure piece 7 and the hot pressing bag 3 under abnormal working conditions or accidents, thereby enhancing the sealing effect; at the same time, the moving ring 18 moves to the right, so that the first inclined surface squeezes the second inclined surface, so that the arc-shaped moving block 19 moves radially inward, thereby pressing the second sealing element 21, which can prevent the possibility of leakage at the threaded connection under abnormal working conditions or accidents, thereby enhancing the sealing effect.

[0030] The key point of this type of molding mold is to ensure that the hot pressing bag 3, the built-in counter-pressure member 7, and the sealing nut 10 can be effectively sealed, and to ensure that the high-temperature, high-pressure oil will not leak during the pressurization and heating process. The present invention, through the design of the first sealing component 12 and the second sealing component 13, can prevent the possibility of leakage between the built-in counter-pressure member 7 and the hot pressing bag 3 under abnormal working conditions or unexpected circumstances, and can prevent the possibility of leakage at the threaded connection under abnormal working conditions or unexpected circumstances, thereby enhancing the sealing effect, ensuring that the high-temperature, high-pressure oil will not leak during the molding process, ensuring safety and reliability during the operation process, and greatly improving the qualified rate of dimensional accuracy, lossless quality, etc., thereby ensuring the stability of the quality of the composite product.

[0031] A hot oil pressing forming method for composite material parts, comprising the following steps:

[0032] Step S1: Laying composite material prepreg on the upper mold body 1 and the lower mold body 4;

[0033] Step S2: After the composite product is laid, the hot pressing bag 3 is placed on the lower mold body 4, and then the upper mold body 1 is assembled to the lower mold body, and is positioned and pressed by pins or bolts;

[0034] Step S3: Install the first sealing assembly 12 and the sealing nut 10;

[0035] Step S4: setting a preset curing program for the composite product in the control system 6;

[0036] Step S5: The oil temperature system 6 heats, pressurizes and circulates the hot pressing oil according to the curing program in the control system 5. The control system 5 is used to monitor the oil pressure temperature and pressure of the hot pressing bag 3 during the curing process in real time, and adjust the heating and pressurizing rates in the oil temperature system 6 in real time according to the feedback results.

[0037] This invention uses oil heating and pressurization to minimize heat loss. The composite product's curing process requires high heating and pressurization rates, making the manufacturing process more energy-efficient than existing molding processes. The finished product also significantly improves the pass rate in terms of dimensional accuracy and lossless quality. This molding tooling also addresses the issue of uniform curing temperature for guide-shaped cavity composite parts in other molding processes, as well as the issue of curing pressure, ensuring the quality of the molding and curing of such parts.

[0038] The hot oil pressing forming device and method of a composite material part of the present invention can prevent the possibility of leakage between the built-in counter-pressure part 7 and the hot pressing bag 3 under abnormal working conditions or accidental circumstances through the design of the first sealing component 12 and the second sealing component 13, and can prevent the possibility of leakage at the threaded connection under abnormal working conditions or accidental circumstances, thereby enhancing the sealing effect, ensuring that high-temperature and high-pressure oil will not leak during the forming process, ensuring safety and reliability during the operation process, and greatly improving the qualified rate of dimensional accuracy, lossless quality and other aspects, thereby ensuring the stability of the quality of composite products.

[0039] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot oil pressing forming device for composite parts, comprising an upper mold body (1), a composite product (2), a hot pressing bag (3), a lower mold body (4), a control system (5), an oil temperature system (6), a built-in counter-pressure piece (7), an upper mounting block (8), a lower mounting block (9), a sealing nut (10), and an external joint (11); the composite product is laid in a closed mold cavity formed by the upper mold body and the lower mold body, and the inner side wall of the composite product is provided with a hot pressing bag; the inner side wall of the hot pressing bag is provided with a built-in counter-pressure piece, the upper mounting block is installed on the outer peripheral side of the upper mold body, the lower mounting block is installed on the outer peripheral side of the lower mold body, a mounting hole is formed between the upper mounting block and the lower mounting block, the built-in counter-pressure piece and the neck of the hot pressing bag are installed in the mounting hole, the outer end of the built-in counter-pressure piece is provided with an external thread, the sealing nut has an internal thread and is connected to the external thread of the outer end of the built-in counter-pressure piece, the other end of the sealing nut is connected to the external joint, and the external joint is connected to the oil temperature system through an oil pipe; Its characteristics are: The mounting hole is provided with a mounting groove (14), a first sealing assembly (12) is installed in the mounting groove, a second sealing assembly (13) is provided in the sealing nut, the first sealing assembly comprises a first sealing element (15), a first spring (16), and a pressure ring (17), the first sealing element, the first spring, and the pressure ring are sleeved on the outer peripheral surface of the built-in counter-pressure piece, the left end surface of the first sealing element abuts and is sealedly connected to the right end surface of the neck of the hot pressing bag, the inner peripheral surface of the first sealing element abuts and is sealedly connected to the outer peripheral surface of the built-in counter-pressure piece, one end of the first spring abuts the first sealing element, the other end abuts the pressure ring, the other end of the pressure ring abuts the second sealing assembly, and when the sealing nut is screwed onto the built-in counter-pressure piece, the pressure ring can move left and right; The second sealing assembly includes a moving ring (18), an arc-shaped moving block (19), a second spring (20), and a second sealing element (21). The moving ring is slidably arranged in the first sliding groove. The left end of the moving ring is in contact with the pressure ring. The right end of the moving ring has a first inclined surface / conical surface. One end of the arc-shaped moving block has a second inclined surface / conical surface. The first inclined surface and the second inclined surface are slidably matched. The other end of the arc-shaped moving block is connected to the second spring. The other end of the second spring is connected to the second sealing element. The other end of the second sealing element is in contact with and sealedly connected to the external threaded surface of the built-in counter-pressure piece. The arc-shaped moving block, the second spring, and the second sealing element are installed in the second sliding groove. The first sliding groove and the second sliding groove are vertically arranged.

2. A hot oil pressing forming device for composite parts according to claim 1, characterized in that: The oil temperature system is connected to the hot pressing bag through the oil inlet pipe and the oil return pipe. The control system is connected to the oil temperature system and the hot pressing bag. The oil temperature system includes a heating device and a pressurizing device. The control system is used to monitor the oil pressure temperature and pressure of the hot pressing bag during the curing process in real time, and adjust the heating and pressurizing rates in the oil temperature system in real time according to the feedback results.

3. The hot oil pressing forming device for composite parts according to claim 2, characterized in that: After the composite prepreg is laid on the upper and lower mold bodies, a customized hot press bag is placed and connected to a heating device and a pressurizing device, and the composite product is cured using circulating high-temperature, high-pressure hot oil; the curing process curve of the composite product is preset in the control system, and the oil temperature system is controlled according to the preset program to perform heating and pressurizing operations, and the heating and pressurizing rates in the oil temperature system are adjusted in real time based on the real-time monitoring of the oil pressure temperature and pressure feedback of the hot press bag during the curing process.

4. The hot oil pressing forming device for composite parts according to claim 3, characterized in that: When the sealing nut (10) is screwed onto the external thread of the built-in counter-pressure member (7), the pressure ring (17) acts as an intermediate force transmission member, causing the first spring (16) to be compressed and press the first sealing element (15), thereby enhancing the sealing effect; at the same time, the moving ring (18) moves to the right, thereby causing the first inclined surface to squeeze the second inclined surface, causing the arc-shaped moving block (19) to move radially inward, thereby pressing the second sealing element (21), thereby enhancing the sealing effect.

5. A method for hot oil pressing forming a composite material part, comprising the hot oil pressing forming device of a composite material part according to claim 4, comprising the following steps: Step S1: Laying composite material prepreg on the upper mold body (1) and the lower mold body (4); Step S2: After the composite product is laid, the hot pressing bag (3) is placed on the lower mold body, and then the upper mold body is assembled to the lower mold body, and is positioned and pressed by pins or bolts; Step S3: Installing the first sealing assembly (12) and the sealing nut (10); Step S4: setting a preset curing program for the composite product in the control system (6); Step S5: The oil temperature system heats, pressurizes and circulates the hot-pressed oil according to the curing program in the control system (5). The control system is used to monitor the oil pressure temperature and pressure of the hot-pressed bag in real time during the curing process, and adjusts the heating and pressurizing rates in the oil temperature system in real time according to the feedback results.

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