A large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold

Abstract

The present invention relates to a large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold, comprising: an upper mold plate, an upper mold insert, a lower mold plate, a lower mold insert, and a vacuum bag air nozzle; the upper mold plate and the lower mold plate are both detachable combined structures, a first positioning guide device is provided between the upper mold plate and the lower mold plate, a second positioning guide device is provided between the upper mold plate and the upper mold insert, and a positioning fixing device is provided between the lower mold plate and the lower mold insert; the vacuum bag air nozzle is separately embedded in the upper mold insert. The present invention has a simple structure, flexible and convenient module assembly and strong adaptability, and the product is easy to demold after molding; the mold processing cost is low, the cycle is short, the precision is high, the strength is good, the risk is small, and the mold heating / cooling is uniform and efficient, and the temperature is controllable and adjustable in real time; the mold positioning and matching precision is high, which can ensure the product's large aspect ratio special-shaped surface closed structure and profile tolerance integrated molding requirements.

Description

Technical Field

[0001] The invention relates to a mould, in particular to a mould with a simple structure, flexible and convenient module assembly and strong adaptability, and the product is easy to demould after molding; the mould has low processing cost, short cycle, high precision, good strength, low risk, uniform heating / cooling efficiency, and real-time controllable and adjustable temperature, and a large aspect ratio hollow ultra-thick special-shaped surface closed-end composite beam mould. Background Art

[0002] As a convenient means of transportation, helicopters are highly favored by the market. With the gradual opening up of the domestic low-altitude area and the vigorous development of the general aviation industry, my country's civil helicopter industry has developed rapidly and has been widely used in various fields, with broad market prospects.

[0003] The rotor system is a key moving component unique to helicopters. It directly determines the helicopter's maneuverability, controllability, speed, vibration level, lifespan, safety and maintainability. It is an important indicator to measure the helicopter's technical level.

[0004] The helicopter rotor system consists of components such as the hub, tilt meter, and blades. The beam is the core load-bearing component of the helicopter, providing the helicopter with the only lift surface, thrust surface, and control surface. Therefore, the performance of the beam is an important indicator of the performance level of the helicopter. Composite beams can be effectively tailored and designed according to dynamic requirements. They have the outstanding characteristics of light weight, corrosion resistance, long fatigue life, and low cost of use. They are the mainstream technology for the design and manufacture of modern helicopter beams.

[0005] At present, the most advanced composite blades of large, medium and light helicopter rotor systems in my country all adopt open beam structures. However, open structure composite blades have the disadvantage of low torsional stiffness, and their structural size and weight must be increased before they can be applied to large composite blades of helicopters. This directly affects the flight performance of helicopters, especially the emergency flight safety performance of helicopter autorotation and landing, making the contradiction between lightweight and high strength of large composite blades of my country's civil helicopters increasingly prominent.

[0006] Foreign large composite blades for helicopters mainly use closed beam structures. Compared with open beam structures, closed beam structures can significantly reduce weight and significantly increase torsional stiffness, making large composite blades for helicopters a good match in terms of lightness and high strength. Therefore, the development of large composite blades with closed beam structures is an important part of my country's helicopter technology progress.

[0007] The molding of composite products and the bonding of components are mainly achieved by precision molds. Therefore, the mold surface tolerance, assembly accuracy and quality stability determine the quality, efficiency and cost of composite molding and bonding.

[0008] The closed beam product is a closed structure made of composite materials, with large aspect ratio, hollow, extra-thick wall, special-shaped surface and theoretical shape, small size and wall thickness tolerance, high surface quality and assembly precision. Therefore, when designing the forming mold, how to make the mold meet these design requirements, which puts forward very high requirements on the structural design of the forming mold. Summary of the invention

[0009] In view of the above problems, the main purpose of the present invention is to provide a hollow, ultra-thick, special-shaped closed-end composite beam mold with a large aspect ratio and a low mold processing cost, short cycle, high precision, good strength, low risk, and high efficiency in mold heating / cooling, and the temperature can be controlled and adjusted in real time, which has a simple structure, flexible and convenient module assembly and strong adaptability, and the product is easy to demold after molding;

[0010] The present invention solves the above-mentioned technical problems through the following technical scheme: a large aspect ratio hollow, extra-thick wall, special-shaped surface closed type composite material beam mold, the large aspect ratio hollow, extra-thick wall, special-shaped surface closed type composite material beam mold comprises: an upper mold plate, an upper mold insert, a lower mold plate, a lower mold insert, and a vacuum bag air nozzle; the upper mold plate and the lower mold plate are both detachable combined structures, a first positioning guide device is provided between the upper mold plate and the lower mold plate, a second positioning guide device is provided between the upper mold plate and the upper mold insert, and a positioning fixing device is provided between the lower mold plate and the lower mold insert; the vacuum bag air nozzle is separately embedded in the upper mold insert.

[0011] In a specific implementation example of the present invention, the detachable combination structure of the upper template and the lower template includes a heating / cooling plate and multiple modules. The heating / cooling plate is equipped with an oil circuit to pass heat-conducting oil to achieve mold heating / cooling. The module is fixedly connected to the heating / cooling plate through a locking block and bolts to form a whole, and each module is symmetrically and evenly spliced ​​in the shape of a "rectangle". Thermocouples for real-time temperature measurement and monitoring of the mold are installed on the sides of all modules.

[0012] In a specific implementation example of the present invention, the first positioning guide device between the upper template and the lower template includes: a guide sleeve provided on the upper template and a guide column provided on the lower template, and the guide sleeve corresponds to the guide column and is slidably matched.

[0013] In a specific implementation example of the present invention, the second positioning guide device between the upper mold plate and the upper mold insert includes: a groove set on the upper mold plate and a boss set on the upper mold insert, the groove corresponds to the boss and slides together, and the vacuum bag air nozzle is separately embedded in the upper mold insert.

[0014] In a specific implementation example of the present invention, the structure of the positioning and fixing device between the lower mold plate and the lower mold insert includes: grooves arranged on both sides of the lower mold insert, guide through holes arranged on both sides of the module, and T-shaped cylindrical positioning pins are used to plug and match with the grooves of the lower mold insert through the guide through holes of the module.

[0015] In a specific implementation example of the present invention, the heating / cooling plate is made of a whole steel plate of equal thickness, and a uniformly arranged oil path is provided inside the heating / cooling plate;

[0016] The thermocouples are all installed on the sides of the modules, and all sides of the modules are provided with thermocouple installation holes which are evenly arranged.

[0017] In a specific implementation example of the present invention, the side of the locking block is a wedge-shaped surface with an angle of 60-80°, and a positioning groove and a threaded hole are provided on the front of the heating / cooling plate. The locking block is fixedly connected to the heating / cooling plate through the positioning groove and bolts to form a whole. The locking blocks are evenly arranged around the module and the sides are plugged into the module. The module is fixedly connected to the heating / cooling plate through the locking block and bolts to form a whole.

[0018] In a specific implementation example of the present invention, the guide sleeve is located on the module of the upper template, the guide post is located on the module of the lower template, and the top circumference of all guide posts is a wedge-shaped surface with an angle range of 8-15°.

[0019] In a specific implementation example of the present invention, the groove is located on the module of the upper mold plate, a boss is provided on the upper mold insert, and both sides of the boss and the groove are wedge-shaped surfaces, and the angle range of the wedge-shaped surface is: 3-8°.

[0020] The grooves are located on both sides of the lower mold insert, and the top circumference of the T-shaped cylindrical positioning pin is a wedge-shaped surface with an angle range of 3-8 degrees.

[0021] In a specific implementation example of the present invention, the number of modules in the detachable combined structure of the upper template and the lower template is three or more.

[0022] The positive and progressive effects of the present invention are: the large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold provided by the present invention has the following advantages: the present invention has a simple structure, the module assembly is flexible and convenient and has strong adaptability, and the product is easy to demold after molding; the mold processing cost is low, the cycle is short, the precision is high, the strength is good, the risk is small, and the mold heating / cooling is uniform and efficient, and the temperature is controllable and adjustable in real time; the mold positioning and matching precision are high, which can ensure the product's large aspect ratio special-shaped surface closed structure and profile tolerance one-piece molding requirements and other advantages. The use of the inventive mold structure can solve the problems of expensive raw material costs, high processing costs, long cycles, poor precision, weak strength, high risks, and high assembly difficulty for large molds; during the one-piece molding process of the product, the mold and product molding temperature can be controlled and adjusted, the heating is uniform, and the molding pressure is stable, the molding process can be guaranteed, and the molding efficiency is significantly improved; after the product is molded, the R angle area, internal and surface quality, wall thickness tolerance, dimensional accuracy, and assembly accuracy can meet the design requirements, and the product qualification rate can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the mold structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the mold upper template structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the lower mold plate structure of the mold of the present invention.

[0026] Figure 4 It is a schematic diagram of the detachable combined structure of the upper mold plate and the lower mold plate of the present invention.

[0027] Figure 5 It is a schematic diagram of the positioning guide device of the upper mold plate and the lower mold plate of the present invention.

[0028] Figure 6 It is a schematic diagram of the positioning and guiding device for the upper mold plate and the upper mold insert of the present invention.

[0029] Figure 7 It is a schematic diagram of the positioning and fixing device of the lower mold plate and the lower mold insert of the mold of the present invention.

[0030] Figure 8 It is a schematic diagram of the mold thermocouple installation method of the present invention.

[0031] Fig. 9 It is a schematic diagram of the installation method of the mold vacuum bag air nozzle of the present invention.

[0032] The following are the names corresponding to the numbers in the present invention: upper template 1, upper mold insert 2, lower template 3, lower mold insert 4, vacuum bag air nozzle 5, heating / cooling plate 6, module 7, locking block 8, thermocouple 9, guide sleeve 10, guide column 11, groove 12, boss 13, locating pin 14, oil circuit 15. DETAILED DESCRIPTION

[0033] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0034] Figure 1 It is a schematic diagram of the mold structure of the present invention, Figure 2 It is a schematic diagram of the mold upper template structure of the present invention, Figure 3 This is a schematic diagram of the lower mold plate structure of the present invention. Figure 4 This is a schematic diagram of the detachable combination structure of the upper mold plate and the lower mold plate of the present invention. Figure 5 Schematic diagram of the positioning guide device for the upper mold plate and the lower mold plate of the present invention. Figure 1-5 As shown: The large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold provided by the present invention comprises: an upper mold plate 1, an upper mold insert 2, a lower mold plate 3, a lower mold insert 4, and a vacuum bag air nozzle 5; the upper mold plate 1 and the lower mold plate 3 are both detachable combined structures, a first positioning guide device is provided between the upper mold plate 1 and the lower mold insert 2, a second positioning guide device is provided between the upper mold plate 1 and the upper mold insert 2, and a positioning fixing device is provided between the lower mold plate 3 and the lower mold insert 4; the vacuum bag air nozzle 5 is separately embedded in the upper mold insert 2.

[0035] The detachable combination structure of the upper mold plate 1 and the lower mold plate 3 includes a heating / cooling plate 6 and a module 7. The heating / cooling plate 6 is provided with an oil circuit 15 (see Fig. 9 ) Heat transfer oil is used to heat / cool the mold. The module 7 is fixedly connected to the heating / cooling plate 6 through a locking block 8 and bolts, and each module 7 is symmetrically and evenly arranged in a "rectangle". Thermocouples 9 are installed on the sides of all modules 7 to measure and monitor the real-time temperature of the mold.

[0036] like Figure 4 As shown, the detachable combination structure of the upper mold plate 1 and the lower mold plate 3 includes two heating / cooling plates 6 and six modules 7. One heating / cooling plate 6 is provided with eight groups of oil circuits 15 (see Fig. 9) Heat transfer oil is used to heat / cool the mold. Three modules 7 are fixedly connected to a heating / cooling plate 6 through eighteen locking blocks 8 and bolts. All modules 7 are first heat treated separately and then the rough-machined surface is opened. Then the three modules 7 are assembled and fixedly connected to the heating / cooling plate 6 to form a whole. The overall surface is finely machined and then used for the stacking and forming of the upper / lower part of the closed beam product. Each module 7 is symmetrically and evenly spliced ​​in a "rectangle". Thermocouples 9 are installed on the sides of all modules 7 to measure and monitor the real-time temperature of the mold. When demolding, first open the upper mold plate 1 and the lower mold plate 3, then remove the upper mold insert 2 and the vacuum bag nozzle 5, and then pull out the T-shaped cylindrical positioning pins 14 on both sides of the lower mold insert 4 to take out the product. The operation is simple and demolding is convenient.

[0037] like Figure 5 As shown, the structure of the positioning guide device of the upper template 1 and the lower template 3 is as follows: the upper template 1 is provided with twelve guide sleeves 10, and the lower template 3 is provided with twelve guide posts 11, and the guide sleeves 10 correspond to the guide posts 11 and are slidably matched.

[0038] like Figure 6 As shown, the structure of the positioning guide device of the upper mold plate 1 and the upper mold insert 2 is as follows: the upper mold plate 1 is provided with grooves 12 at the head and tail, and the upper mold inserts 2 at the head and tail are provided with bosses 13, and the grooves 12 correspond to the bosses 13 and slide in cooperation. Fig. 9 As shown, two groups of vacuum bag air nozzles 5 for inlet and outlet are separately embedded in the head and tail upper mold inserts 2, and are used to circulate high-pressure gas inside the mold cavity to provide the internal pressure required for product molding.

[0039] like Figure 7 As shown, the structure of the positioning and fixing device of the lower mold plate 3 and the lower mold insert 4 is: two grooves 12 are provided on both sides of the lower mold insert 4, and two guide through holes are provided on both sides of the module 7. Two T-shaped cylindrical locating pins 14 are plugged into and matched with the two grooves 12 of the lower mold insert 4 through the two guide through holes of the module 7. This structure eliminates the traditional bolt fixing method of the insert 4. When disassembling and assembling the insert 4, there is no need to flip the lower mold plate 3 back and forth to disassemble the bolts. The insertion and matching method of the locating pins 14 and the insert 4 makes the disassembly and assembly of the insert 4 fast, direct and reliable, and the operation is simple and convenient.

[0040] like Figure 1-3 As shown, in the specific implementation process, the two heating / cooling plates 6 can be made of a whole piece of 50mm thick steel plate, with sixteen groups of oil circuits 15 arranged evenly, and the mold is heated / cooled and temperature regulated by heat transfer oil.

[0041] like Figure 2-4As shown, the sides of the thirty-six locking blocks 8 are wedge-shaped with an angle of 80°, and the front of a heating / cooling plate 6 is provided with eighteen positioning grooves and forty-four threaded holes. The eighteen locking blocks 8 are fixedly connected to the heating / cooling plate 6 through the positioning grooves and bolts to form a whole. The eighteen locking blocks 8 are evenly arranged around the three modules 7 and the sides are plugged into the modules 7. The three modules 7 are fixedly connected to the heating / cooling plate 6 through the eighteen locking blocks 8 and bolts to form a whole.

[0042] like Figure 8 As shown, twenty-two thermocouples 9 are installed on the sides of six modules 7, and all the sides of the modules 7 are provided with thermocouple 9 mounting holes and are evenly arranged. The mold is measured and monitored in real time temperature by the twenty-two thermocouples 9.

[0043] like Figure 5 As shown, twelve guide sleeves 10 are located on three modules 7 of the upper template 1, twelve guide pillars 11 are located on three modules 7 of the lower template 3, and the top circumferences of all guide pillars 11 are wedge-shaped surfaces with an angle of 10°.

[0044] like Figure 6 As shown, the head and tail grooves 12 are located on the head and tail modules 7 of the upper mold plate 1, and the head and tail upper mold inserts 2 are provided with bosses 13, and both sides of the bosses 13 and the grooves 12 are wedge-shaped surfaces with an angle of 5°.

[0045] like Figure 1-3 As shown in Figure 9, the number of modules 7 in the detachable combined structure of the upper template 1 and the lower template 3 is six.

[0046] The present invention has a simple structure, and the module assembly is flexible and convenient, and the adaptability is strong. The product is easy to demold after molding. The mold processing cost is low, the cycle is short, the precision is high, the strength is good, the risk is small, and the mold heating / cooling is uniform and efficient, and the temperature is controllable and adjustable in real time. The mold positioning and matching precision are high, which can ensure the advantages of the product's large aspect ratio special-shaped surface closed-end structure and the profile tolerance one-piece molding requirements. The use of the mold structure of the invention can solve the problems of expensive raw material costs, high processing costs, long cycles, poor precision, weak strength, high risks, and high assembly difficulty for large molds. During the one-piece molding process of the product, the mold and product molding temperature can be controlled and adjusted, the heating is uniform, and the molding pressure is stable. The molding process can be guaranteed, and the molding efficiency is significantly improved. After the product is molded, the R angle area, internal and surface quality, wall thickness tolerance, dimensional accuracy, and assembly accuracy can meet the design requirements, and the product qualification rate can be guaranteed.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A large aspect ratio hollow ultra-thick special-shaped closed composite beam mold, characterized by: The large aspect ratio hollow ultra-thick profiled closed-end composite beam mold comprises: an upper mold plate (1), an upper mold insert (2), a lower mold plate (3), a lower mold insert (4), and a vacuum bag air nozzle (5); the upper mold plate (1) and the lower mold plate (3) are both detachable combined structures, a first positioning guide device is provided between the upper mold plate (1) and the lower mold insert (3), a second positioning guide device is provided between the upper mold plate (1) and the upper mold insert (2), and a positioning fixing device is provided between the lower mold plate (3) and the lower mold insert (4); The detachable combination structure of the upper mold plate (1) and the lower mold plate (3) comprises a heating / cooling plate (6) and a plurality of modules (7). The heating / cooling plate (6) is provided with an oil circuit (15) for passing heat-conducting oil to heat / cool the mold. The modules (7) are fixedly connected to the heating / cooling plate (6) through locking blocks (8) and bolts to form a whole. Each module (7) is symmetrically arranged and evenly spliced ​​in a "rectangle". Thermocouples (9) for measuring and monitoring the real-time temperature of the mold are installed on the sides of all modules (7); The second positioning guide device between the upper mold plate (1) and the upper mold insert (2) comprises: a groove (12) provided on the upper mold plate (1) and a boss (13) provided on the upper mold insert (2), the groove (12) and the boss (13) corresponding to each other and slidably matched, and the vacuum bag nozzle (5) is separately embedded in the upper mold insert (2); The structure of the positioning and fixing device between the lower mold plate (3) and the lower mold insert (4) comprises: grooves (12) arranged on both sides of the lower mold insert (4), guide through holes arranged on both sides of the module (7), and T-shaped cylindrical positioning pins (14) are inserted and matched with the grooves (12) of the lower mold insert (4) through the guide through holes of the module (7); The side of the locking block (8) is a wedge-shaped surface with an angle of 60-80 degrees. The front of the heating / cooling plate (6) is provided with a positioning groove and a threaded hole. The locking block (8) is fixedly connected to the heating / cooling plate (6) through the positioning groove and bolts to form a whole. The locking blocks (8) are evenly arranged around the module (7) and the side faces are plugged into the module (7). The module (7) is fixedly connected to the heating / cooling plate (6) through the locking block (8) and the bolts to form a whole. The groove (12) is located on the module (7) of the upper mold plate (1), and a boss (13) is provided on the upper mold insert (2), and both sides of the boss (13) and the groove (12) are wedge-shaped surfaces, and the angle range of the wedge-shaped surface is: 3-8°; The grooves (12) are located on both sides of the lower mold insert (4), and the top circumference of the T-shaped cylindrical positioning pin (14) is a wedge-shaped surface, and the angle range of the wedge-shaped surface is: 3-8°.

2. The large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold according to claim 1 is characterized by: The first positioning guide device between the upper template (1) and the lower template (3) comprises: a guide sleeve (10) arranged on the upper template (1) and a guide column (11) arranged on the lower template (3); the guide sleeve (10) corresponds to the guide column (11) and is slidably matched.

3. The large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold according to claim 1 is characterized by: The heating / cooling plate (6) is made of a whole steel plate of equal thickness, and a uniformly arranged oil path (15) is arranged inside the heating / cooling plate (6); The thermocouples (9) are all installed on the sides of the modules (7), and all the sides of the modules (7) are provided with thermocouple (9) installation holes which are evenly arranged.

4. The large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold according to claim 2 is characterized by: The guide sleeve (10) is located on the module (7) of the upper template (1), the guide post (11) is located on the module (7) of the lower template (3), and the top circumference of all the guide posts (11) is a wedge-shaped surface, and the angle range of the wedge-shaped surface is: 8-15°.

5. The large aspect ratio hollow ultra-thick special-shaped surface closed composite beam mold according to claim 1, characterized in that: The number of modules (7) in the detachable combined structure of the upper template (1) and the lower template (3) is three or more.

Images