Composite material preforming tool equipment and control method thereof

Abstract

The invention discloses composite material preforming tool equipment and a control method thereof. The equipment comprises a pre-forming tool body and a pressure intensity control assembly, at least one independent air chamber is arranged in the pre-forming tool body; the pressure intensity control assembly comprises an inflation and deflation pump, a control valve assembly and a controller. Wherein the inflation and deflation pump is communicated with the control valve assembly through a main pipeline, the control valve assembly comprises at least one branch control valve, the at least one branch control valve is arranged on at least one branch branched from the main pipeline in a one-to-one correspondence mode, and the branches are communicated with the independent air chambers in a one-to-one correspondence mode; the controller is electrically connected with the inflation and deflation pump and the control valve assembly. According to the equipment, accurate control over the pressure of different areas in the preforming process is achieved, the technological process is simplified, and the equipment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of composite material preforming equipment, and in particular to a composite material preforming tooling equipment and a control method thereof. Background Art

[0002] Composite material preforming is a key process in the manufacturing process of composite material components, and its quality directly affects the performance of the final product. At present, composite material preforming mainly adopts vacuum-assisted preforming process, and negative pressure preforming is achieved through preforming tooling and vacuum pump. This method has the following problems: the preforming tooling can only provide a single negative pressure, and it is impossible to achieve zoning control according to the geometric characteristics of the composite material component, which leads to local wrinkles, delamination and other defects in the preforming process; after the preforming is completed, the preformed product needs to be manually removed from the tooling and transferred to the preforming tooling, which is easy to cause deformation or damage to the preformed product during manual operation; in addition, in addition to the preforming tooling, a separate transfer tooling is also required in the process, which has high equipment cost and complicated process flow.

[0003] The traditional composite material preforming process uses a single pressure control method, which cannot meet the preforming requirements of different geometric feature areas. For example, when preforming a hat-shaped long spar, different areas such as the top plate, web plate, flange, etc. need to apply different pressures to ensure the preforming quality due to differences in geometric features. Similarly, when preforming reinforced wall panels, the base wall panels and reinforcement rib areas also require differentiated pressure control. However, the existing technology is difficult to achieve such precise pressure control in different regions, which affects the quality of the preformed products. Summary of the invention

[0004] The purpose of the present invention is to provide a composite material preforming tooling equipment and a control method thereof, which are used to solve the technical problems in the prior art such as single preforming pressure control, defects easily caused by manual demoulding transfer, and high equipment cost.

[0005] The technical solution of the present invention is as follows: The present invention provides a composite material preforming tooling equipment, comprising: A preformed tooling body, wherein at least one independent air chamber is arranged inside the preformed tooling body; A gas pipeline, comprising a main pipeline connected to the gas charging and discharging pump and at least one branch branched from the main pipeline, wherein at least one branch is connected to at least one of the independent gas chambers in a one-to-one correspondence; A pressure control assembly, the pressure control assembly comprising an air charging and discharging pump, a control valve assembly and a controller, the air charging and discharging pump being connected to the main pipeline, the control valve assembly comprising at least one branch control valve, at least one branch control valve being arranged one-to-one on at least one branch, the branch control valve being used to control the on-off of the branch, the controller being electrically connected to the air charging and discharging pump and the control valve assembly; wherein the controller is used to control the action of the air charging and discharging pump and the control valve assembly to control the air pressure value in each of the independent air chambers, thereby completing the preforming and demolding transfer of the composite material.

[0006] Specifically, the branch control valve is a solenoid valve, which is electrically connected to the controller via a signal line and is used to receive a switch signal sent by the controller.

[0007] Furthermore, the device also includes a pressure sensor, which is arranged in each of the independent air chambers and is used to detect the pressure in the independent air chamber and transmit the detection signal to the controller.

[0008] Specifically, the independent air chambers are distributed in an array along the interior of the preform tooling body.

[0009] Furthermore, the controller has a built-in preset control program, and the preset control program includes pressure control parameters and pressure control timing of each of the independent air chambers.

[0010] Specifically, the device further comprises an alignment mechanism, which is arranged on the preforming tool body and is used for position alignment between different processes.

[0011] The present invention also provides a control method for the composite material preforming tooling equipment, comprising: The controller receives a control parameter, wherein the control parameter is used to control the air pressure value in each of the independent air chambers; The controller controls the inflation and deflation pump and the control valve assembly to inflate and deflate each of the independent air chambers based on the control parameters, so as to control the air pressure value of each of the independent air chambers, wherein the air pressure value of each of the independent air chambers can be independently controlled.

[0012] Furthermore, before applying a preset air pressure value to each of the independent air chambers, the method further includes: Obtain three-dimensional model data of composite parts; Calculating the curvature and thickness distribution of each region of the composite material part based on the three-dimensional model data; According to the curvature and thickness distribution, the target air pressure value of each independent air chamber is determined, wherein the air pressure value of the independent air chamber corresponding to the area with larger curvature is greater than the air pressure value of the independent air chamber corresponding to the area with smaller curvature.

[0013] Specifically, when the controller controls the inflation and deflation pump and the control valve assembly to inflate and deflate each of the independent air chambers based on the control parameters, the air pressure value of each of the independent air chambers is sequentially changed according to a preset time sequence, wherein the preset time sequence includes sequentially executing: The first stage: adjusting the air pressure value of each independent air chamber in sequence from the central area to the edge area of ​​the composite material product; The second stage: maintaining the air pressure value stable for a preset time; The third stage: adjusting the air pressure value of each independent air chamber in sequence from the edge area to the central area.

[0014] The present invention also provides an electronic device, comprising: a memory storing a computer program; and a processor for executing the computer program to implement the above control method.

[0015] The present invention can realize precise control of pressure in different areas during the preforming process by setting at least one independent air chamber inside the preforming tool body and using a programmable pressure control component. The pressure control component can apply an independently set air pressure value to each air chamber, which can not only ensure the preforming quality through negative pressure control, but also realize the automatic transfer of the preformed part to the forming tool through positive pressure control, so that the preforming tool body has both preforming and transfer functions, eliminating the need for a separate transfer tool, effectively simplifying the process flow, and significantly reducing the equipment cost.

[0016] The above-mentioned beneficial effects are achieved thanks to the synergistic effect of the following technical features: the pressure sensor arranged in each independent air chamber collects pressure data in real time and feeds it back to the controller to form a closed-loop control system, thereby ensuring the accuracy of pressure control; the preset control program built into the controller can calculate the curvature and thickness distribution of each area based on the three-dimensional model data of the composite material part, and determine the target air pressure value of each independent air chamber accordingly, thereby realizing intelligent control of the preforming process; through the preset pressure control timing, the air pressure value is adjusted from the central area to the edge area of ​​the composite material part in sequence, and then after a stable pressure holding stage, it is adjusted from the edge area to the central area in sequence, thereby ensuring the preforming quality and realizing reliable demolding of the preformed parts; the alignment mechanism arranged on the preforming tooling body realizes precise positioning with the forming tooling, thereby ensuring the position accuracy of the preformed parts during the transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a composite material preforming tooling equipment in one embodiment of the present invention; Figure 2 It is a schematic structural diagram of a preformed tooling body in one embodiment of the present invention; Figure 3It is a schematic flow chart of a composite material preforming tooling equipment control method in one embodiment of the present invention.

[0018] In the figure: 1. preformed tooling body, 11. independent air chamber, 2. adjustable pressure device, 21. pressure sensor. DETAILED DESCRIPTION

[0019] In the description of the present invention, unless otherwise specified, the following terms have the following meanings: "Preforming" refers to the process of compacting and curing fiber prepreg or dry fiber preform at room temperature to make it basically preformed during the manufacturing process of composite material components. "Independent air chamber" refers to a mutually isolated enclosed space set on the surface of the preformed tooling body, which is used to apply pressure to different areas of the tooling surface. "Positive pressure" refers to a pressure greater than atmospheric pressure, and "negative pressure" refers to a pressure less than atmospheric pressure. "Closed-loop control" refers to an automatic control method for real-time adjustment of the charging and discharging air pump and control valve based on the feedback signal of the pressure sensor. "Progressive demolding" refers to the process of applying positive pressure to different areas in sequence according to the preset timing and pressure, so that the preformed product gradually separates from the tooling surface. It should be noted that the explanation of the above terms is only used to help understand the technical solution of the present invention and should not be understood as a limitation on the scope of protection of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Embodiment 1 The present invention provides a composite material preforming tooling equipment, such as Figure 1 As shown, it includes a preformed tooling body 1 and a pressure control component 2.

[0022] The preform tool body 1 can be made of metal material, and a plurality of independent air chambers 11 are arranged inside the preform tool body 1 .

[0023] like Figure 2As shown, the independent air chambers 11 are distributed in an array inside the preform tooling body, and a pressure sensor 21 is provided in each independent air chamber 11. This distribution method is conducive to achieving precise pressure control in different regions and improving the quality of preforms. In this embodiment, the independent air chambers 11 can be selected in different shapes according to the structural characteristics of the preformed parts, such as circular, rectangular, triangular, hexagonal, etc. Preferably, the independent air chambers 11 adopt a rectangular structure and are distributed in a rectangular array. The size of each independent air chamber 11 can be 30mm×30mm, 40mm×40mm, 50mm×50mm, 60mm×60mm or 80mm×80mm. The number and distribution of the independent air chambers 11 can be adjusted according to the size of the actual preformed parts, for example, they can be set to a rectangular array of 4×6, 6×8, 8×10 or 10×12. In this embodiment, it is preferred to use a rectangular independent air chamber of 50mm×50mm, set to a rectangular array of 6×8, with a total of 48 independent air chambers.

[0024] Each of the independent air chambers 11 is connected to a branch, which is separated from the main pipeline. The main pipeline is connected to the inflation and deflation pump for providing gas; the inner diameter of the branch can be 4mm, 6mm or 8mm, and the inner diameter is 6mm in this embodiment. A sealed partition is provided between adjacent independent air chambers 11, and a rubber sealing strip or a metal partition can be used to achieve sealed isolation between the air chambers. The width of the sealed partition can be 3mm, 5mm or 8mm, and a 5mm wide metal partition is used in this embodiment.

[0025] In order to adapt to preformed parts of different geometric shapes, the independent air chambers 11 can also be arranged in other ways. For example, when the preformed part is a cylindrical structure, the independent air chambers 11 can be evenly arranged along the circumferential direction, each of the independent air chambers 11 is fan-shaped, 2-4 layers are arranged radially, and 8-16 independent air chambers are arranged circumferentially in each layer. For another example, when the preformed part is a conical structure, the independent air chambers 11 can be set as a trapezoid with a gradual change in size, and the area is reduced layer by layer from bottom to top. For another example, when the preformed part is a special-shaped structure, the independent air chambers 11 can be set as irregular polygons according to the contour characteristics of the part to achieve full coverage of the surface of the part.

[0026] The pressure control assembly 2 includes a charging and discharging air pump (not shown in the figure), a control valve assembly and a controller (not shown in the figure). Among them, the charging and discharging air pump can be a bidirectional air pump of the type of reciprocating piston pump, rotary vane pump, screw pump or Roots pump. In this embodiment, an oil-free reciprocating piston pump is preferably used, and its working principle is: the piston is driven by a motor to reciprocate in the cylinder to achieve the bidirectional function of intake and exhaust. The exhaust volume of the charging and discharging air pump can be 60L / min, 120L / min or 180L / min, and the power can be 0.75kW, 1.5kW or 2.2kW. In this embodiment, a reciprocating piston pump with an exhaust volume of 120L / min and a power of 1.5kW is used. The charging and discharging air pump can generate a maximum negative pressure of -0.1MPa and a maximum positive pressure of 0.3MPa, and the working speed can be adjusted within the range of 0-1440rpm.

[0027] In order to improve the reliability of the system, a buffer gas tank with a volume of 10L, 20L or 30L is provided at the connection end of the charging and discharging air pump. The buffer gas tank is used to reduce the start and stop frequency of the air pump and balance the air pressure fluctuations. In this embodiment, a buffer gas tank with a volume of 20L is selected. The charging and discharging air pump is also equipped with a filter, a silencer and a shock absorber. Among them, the filter adopts a two-stage filtration structure, including a primary filter and a precision filter, and the filtration precisions are 5μm and 1μm respectively; the silencer can reduce the working noise to below 75dB; the shock absorber includes a shock absorbing pad and a shock absorbing spring, which are used to reduce the vibration of the equipment during operation.

[0028] In an optional embodiment, the charging and discharging air pump can also adopt frequency conversion control to achieve continuous adjustable air pressure by adjusting the motor speed. The power of the frequency converter matches the motor power, the frequency adjustment range is 0-60Hz, and it has overload protection, overvoltage protection and undervoltage protection functions. The frequency conversion control method can realize soft start and soft stop of the air pump, extending the service life of the equipment.

[0029] The control valve assembly includes a branch control valve arranged on each branch. The branch control valve adopts a solenoid valve, which is electrically connected to the controller through a signal line, and is used to receive a switch signal sent by the controller to control the on and off of the corresponding branch. The specific structure of the branch control valve belongs to the conventional choice of those skilled in the art, and will not be described here.

[0030] The controller adopts an industrial control computer, which is electrically connected to the charging and discharging air pump and the control valve assembly through a data acquisition card. The controller receives control parameters for controlling the air pressure value in each of the independent air chambers, and controls the charging and discharging air pump and the control valve assembly to charge and discharge each of the independent air chambers based on the control parameters, so as to independently control the air pressure value of each of the independent air chambers. Specifically, the controller can obtain the three-dimensional model data of the composite material part, calculate the curvature and thickness distribution of each area of ​​the part based on the three-dimensional model data, and determine the target air pressure value of each independent air chamber according to the calculation result, wherein the air pressure value of the independent air chamber corresponding to the area with larger curvature is greater than the air pressure value of the independent air chamber corresponding to the area with smaller curvature. The controller changes the air pressure value of each of the independent air chambers in sequence according to a preset time sequence, and the preset time sequence includes three stages executed in sequence: first, the air pressure value of each independent air chamber is adjusted in sequence from the central area to the edge area of ​​the composite material part, then the air pressure value is kept stable for a preset time, and finally, the air pressure value of each independent air chamber is adjusted in sequence from the edge area to the central area.

[0031] A pressure sensor is provided in each of the independent air chambers 11 to detect the pressure in the air chamber and transmit the detection signal to the controller. The pressure sensor can be a piezoresistive, capacitive, piezoelectric or inductive pressure sensor. In this embodiment, a piezoresistive pressure sensor is preferably used, and its working principle is to measure the pressure by utilizing the characteristic that the resistance value of the silicon piezoresistive element changes when it is deformed by force. The measuring range of the pressure sensor can be -0.1MPa to 0.2MPa, -0.1MPa to 0.3MPa or -0.2MPa to 0.4MPa, the measuring accuracy can be 0.5%FS, 0.25%FS or 0.1%FS, and the response time can be 2ms, 5ms or 10ms. In this embodiment, the measuring range of the pressure sensor is -0.1MPa to 0.3MPa, the measuring accuracy is 0.1%FS, and the response time is 5ms. The pressure sensor is powered by DC24V, and the output signal is a 4-20mA standard current signal or a 0-5V voltage signal.

[0032] The pressure sensor is electrically connected to the controller via a shielded cable. The wire diameter of the shielded cable can be 0.5mm², 0.75mm² or 1.0mm², and the length can be 2m, 3m or 5m. In this embodiment, a four-core shielded cable with a wire diameter of 0.75mm² and a length of 3m is used. The pressure sensor and the controller form a closed-loop control system, and the control period can be 50ms, 100ms or 200ms, and is set to 100ms in this embodiment.

[0033] This embodiment also includes an alignment mechanism (not shown in the figure), which is arranged on the preforming tooling body and is used for position alignment between different processes. The alignment mechanism can adopt a positioning pin-positioning hole structure, a guide column-guide sleeve structure or a conical surface positioning structure. In this embodiment, the alignment mechanism includes a positioning pin arranged on the periphery of the preforming tooling body and a positioning hole arranged at the corresponding position of the forming tooling. The positioning pin can be cylindrical, stepped or tapered. The material can be quenched and tempered steel such as 40Cr, 42CrMo or 9SiCr. The surface is quenched and ground, and the hardness is not less than HRC45. The diameter of the positioning pin can be 12mm, 16mm or 20mm, and the length can be 40mm, 50mm or 60mm. In this embodiment, a cylindrical positioning pin with a diameter of 16mm and a length of 50mm is used, the material is 42CrMo, and the surface hardness is HRC48-52.

[0034] The positioning hole is arranged on the molding tool, and has an interference fit or a clearance fit with the positioning pin. When an interference fit is adopted, the fitting clearance can be 0.01-0.03mm; when a clearance fit is adopted, the fitting clearance can be 0.02-0.05mm. In this embodiment, a clearance fit is adopted, and the fitting clearance is 0.03mm. The number of the positioning pins and the positioning holes can be 2, 3 or 4. In this embodiment, 3 are arranged, of which 2 are used for positioning and 1 is used for orientation. Through the cooperation of the positioning pins and the positioning holes, the precise positioning of the pre-molding tool body and the molding tool can be achieved, and the positioning accuracy is better than 0.05mm.

[0035] To prevent the positioning and matching parts from being worn, a wear-resistant bushing can be provided in the positioning hole, and the wear-resistant bushing can be a copper-based oil-containing bearing, a nylon bushing or a polymer composite bushing. In this embodiment, a copper-based oil-containing bearing is selected as the wear-resistant bushing, and the surface roughness of the inner hole thereof is Ra≤0.8μm.

[0036] The present invention realizes the preforming and automatic transfer of composite material parts by accurately controlling the pressure of each independent air chamber. The specific implementation process is as follows: 1. After preforming is completed, align and position the preforming tooling body with the forming tooling; 2. The alignment mechanism (locating pin) set on the preforming tooling body is precisely matched with the positioning hole on the forming tooling to ensure accurate relative position; 3. The controller executes the preset sequence based on the control parameters: 1) First, adjust the air pressure of each independent air chamber from the center area to the edge area of ​​the composite material part; 2) Keep the air pressure stable for a preset time; 3) Adjust the air pressure of each independent air chamber from the edge area to the center area.

[0037] This design achieves reliable preforming and automatic transfer of composite parts by precisely controlling the air pressure values ​​in different areas, effectively simplifying the process and improving manufacturing efficiency.

[0038] The beneficial effect of the present invention is that the present invention realizes precise control of the pressure in different areas during the preforming process by setting at least one independent air chamber inside the preforming tool body and combining it with a programmable pressure control component. The pressure control component can not only apply independent negative pressure to each air chamber to ensure the quality of preforming, but also can be converted into positive pressure after the preforming is completed to realize automatic demolding and transfer of the preformed parts. This design enables the preforming tool body to have both preforming and transfer functions, eliminating the need for special transfer tooling, effectively simplifying the process flow, and significantly reducing equipment costs.

[0039] Furthermore, the present invention sets a pressure sensor in each independent air chamber, collects pressure data in real time and feeds it back to the controller, forming a closed-loop control system. The system can calculate the curvature and thickness distribution of each area based on the three-dimensional model data of the composite material workpiece, and determine the target air pressure value of each independent air chamber accordingly, thereby realizing intelligent control of the preforming process. At the same time, the present invention adopts a precise alignment mechanism, and ensures the position accuracy of the preformed workpiece during the transfer process by cooperating with the positioning pins set on the preforming tooling body and the positioning holes on the forming tooling. Through the preset pressure control timing, the progressive pressure adjustment from the center to the edge and then from the edge to the center is realized step by step. Compared with the traditional manual operation method, the risk of deformation, wrinkles and other defects of the preformed workpiece during demolding and transfer is significantly reduced, and the yield rate of composite material preforming is improved.

[0040] Embodiment 2 The present invention also provides a control method for the composite material preforming tooling equipment. This embodiment is described by taking the preforming of a hat-shaped long stringer component as an example.

[0041] The hat-shaped long stringer is a typical composite material component for aerospace, and its cross section is a hat-shaped structure, including a top plate, a web plate, a flange and a rounded transition zone. Specifically, the top of the hat-shaped long stringer is a horizontal top plate, and a vertical web plate is connected to each side of the top plate, and the bottom of each web plate extends through a flange. A rounded transition zone is provided between the top plate and the web plate, and between the web plate and the flange to form a continuous and smooth transition. The width of the top plate can be 40mm, 60mm or 80mm; the height of the web plate can be 30mm, 40mm or 50mm; the width of the flange can be 20mm, 25mm or 30mm; the radius of the rounded transition zone can be 5mm, 8mm or 10mm. In this embodiment, the width of the top plate is 60mm, the height of the web plate is 40mm, the width of the flange is 25mm, and the radius of the rounded transition zone is 8mm. The length of the hat-shaped long stringer can be 500mm, 800mm or 1000mm, and in this embodiment, it is 800mm.

[0042] First, based on the three-dimensional model data of the hat-shaped long stringer, the curvature and thickness distribution of each area are calculated. Since the curvature of the fillet transition area is the largest, followed by the web and flange areas, and the curvature of the top plate area is the smallest, different air pressure values ​​are set accordingly.

[0043] The composite material preform blank is laid on the forming surface of the preform tooling body. According to the structural characteristics of different areas of the hat-shaped long stringer, the independent air chamber is divided into the following control areas: 1) Top plate area: 2×16 independent air chambers are set along the width direction of the top plate, and the size of each air chamber is 30mm×50mm; 2) Web area: 1×8 independent air chambers are set along the height direction of the web, and the size of each air chamber is 40mm×100mm; 3) Flange area: 1×16 independent air chambers are set along the width direction of the flange, and the size of each air chamber is 25mm×50mm; 4) Rounded corner transition area: 1×16 independent air chambers are set along the arc length direction of the rounded corner, and the size of each air chamber is 20mm×50mm.

[0044] According to the curvature distribution of each area, the target air pressure value of the independent air chamber is determined: 1) Top plate area: Due to the smallest curvature, a pressure of -0.05 MPa is applied; 2) Web area: local wrinkles need to be prevented, and an air pressure of -0.08MPa is applied; 3) Flange area: ensure that it fits the tooling and apply an air pressure of -0.07MPa; 4) Rounded corner transition area: Since the curvature is the largest, an air pressure of -0.09MPa is applied to prevent wrinkling and springback.

[0045] The pressure sensor monitors the actual pressure of each air chamber in real time, with a control accuracy of ±0.002MPa. Pressure control is performed in three stages according to the preset timing: The first stage: adjust the air pressure of each independent air chamber from the center area of ​​the workpiece (the center of the top plate) to the edge area (the end of the flange): 1) Apply air pressure to the center area of ​​the top plate for 2 seconds; 2) Then apply air pressure to the belly plate area for 2 seconds; 3) Then apply air pressure to the fillet transition area for 2 seconds; 4) Finally, apply air pressure to the flange area for 2 seconds.

[0046] Phase 2: Keep the air pressure in each area stable for a preset time: 1) Top plate area: maintain pressure for 10 minutes; 2) Web area: maintain pressure for 15 minutes; 3) Flange area: maintain pressure for 12 minutes; 4) Fillet transition area: maintain pressure for 18 minutes.

[0047] Stage 3: Adjust the air pressure from the edge area to the center area: 1) First, adjust the air pressure in the flange area for 2 seconds; 2) Then adjust the air pressure value in the rounded corner transition area for 2 seconds; 3) Then adjust the air pressure in the belly area for 2 seconds; 4) Finally, adjust the air pressure in the center area of ​​the top plate and keep it for 2 seconds.

[0048] This pressure zoning control strategy based on curvature distribution can effectively avoid defects such as wrinkles, wrinkles, and springback during the preforming process of the hat-shaped long stringer, thereby improving the preforming quality. For hat-shaped long stringers of different sizes, the air chamber parameters and control parameters of each area can be adjusted through the human-machine interface of the controller to achieve flexible control of the process.

[0049] Embodiment 3 This embodiment takes the preforming of a stiffened wall panel component as an example to illustrate the control method of the present invention.

[0050] The stiffened wall panel is a typical composite material component for aerospace, which is composed of a base wall panel and stiffeners arranged thereon. The base wall panel is a planar structure, and its thickness can be 2mm, 3mm or 4mm. The stiffener can adopt a "T" type, "I" type, "L" type, "J" type, "Z" type or "Ω" type section. In this embodiment, a "T" type stiffener is adopted. The "T" type stiffener includes a rib web and a rib cap, wherein the rib web is perpendicular to the base wall panel, and the rib cap is parallel to the base wall panel. The height of the rib web can be 30mm, 40mm or 50mm, and the thickness can be 3mm, 4mm or 5mm; the width of the rib cap can be 40mm, 50mm or 60mm, and the thickness can be 3mm, 4mm or 5mm. In this embodiment, the rib web height of the stiffener is 40mm, the thickness is 4mm, and the rib cap width is 50mm, and the thickness is 4mm. The number of the reinforcing ribs may be 3, 4 or 5, and the spacing between adjacent reinforcing ribs may be 150 mm, 200 mm or 250 mm. In this embodiment, 4 reinforcing ribs are provided, and the spacing is 200 mm.

[0051] First, based on the three-dimensional model data of the reinforced wall panel, the curvature and thickness distribution of each area are calculated. Since the curvature of the transition area is the largest, followed by the rib web and rib cap area, and the curvature of the base wall panel area is the smallest, different air pressure values ​​are set accordingly.

[0052] The composite material preform blank is laid on the forming surface of the preform tooling body. According to the structural characteristics of the reinforced wall panel, the independent air chamber is divided into the following control areas: 1) Basic wall panel area: independent air chambers are arranged in a rectangular array, with a total of 16×20 air chambers, each with a size of 30mm×40mm; 2) Rib area: Rib belly area: 1×40 independent air chambers are set along the height direction of the rib belly, and the size of each air chamber is 40mm×20mm; Rib cap area: 2×40 independent air chambers are set along the width direction of the rib cap, and the size of each air chamber is 25mm×20mm; Transition area: 1×40 independent air chambers are set at the connection between the rib web and the foundation wall panel, and at the connection between the rib web and the rib cap. The size of each air chamber is 20mm×20mm.

[0053] According to the curvature distribution of each area, the target air pressure value of the independent air chamber is determined: 1) Foundation siding area: Due to the smallest curvature, an air pressure value of -0.05 MPa is applied to the central area; Apply an air pressure of -0.06MPa to the edge area to prevent wrinkles during preforming; 2) Rib area: Apply an air pressure of -0.08MPa to the rib belly area to ensure verticality; The air pressure value of -0.07MPa is applied to the rib cap area; Due to the maximum curvature, an air pressure value of -0.09 MPa is applied in the transition area to prevent wrinkling and delamination.

[0054] The pressure sensor monitors the actual pressure of each air chamber in real time. Pressure control is performed in three stages according to a preset time sequence: The first stage: adjust the air pressure of each independent air chamber from the center area of ​​the workpiece (the center of the basic wall panel) to the edge area in sequence: 1) First, apply air pressure to the center area of ​​the foundation wall panel for 2 seconds; 2) Then apply air pressure to the edge area of ​​the foundation wall panel for 2 seconds; 3) Then apply air pressure to the rib cap area of ​​the reinforcement for 2 seconds; 4) Apply air pressure to the belly area of ​​the reinforcing rib for 2 seconds; 5) Finally, apply air pressure to the transition area for 2 seconds.

[0055] Phase 2: Keep the air pressure in each area stable for a preset time: Base wall area: maintain pressure for 12 minutes; Muscle and abdomen area: maintain pressure for 18 minutes; Rib cap area: maintain pressure for 15 minutes; Transition zone: Maintain pressure for 20 minutes.

[0056] Stage 3: Adjust the air pressure from the edge area to the center area: 1) First, adjust the air pressure in the transition area for 2 seconds; 2) Then adjust the air pressure value in the belly area of ​​the reinforcing rib for 2 seconds; 3) Then adjust the air pressure value of the rib cap area of ​​the reinforcing rib for 2 seconds; 4) Adjust the air pressure value at the edge of the foundation wall panel for 2 seconds; 5) Finally, adjust the air pressure in the center area of ​​the foundation wall panel for 2 seconds.

[0057] This pressure zoning control strategy based on curvature distribution can effectively avoid defects such as wrinkles, wrinkles, and delamination in the preforming process of the reinforced wall panels, thereby improving the preforming quality. For reinforced wall panels of different sizes, the air chamber parameters and control parameters of each area can be adjusted through the human-machine interface of the controller to achieve flexible control of the process.

[0058] This embodiment effectively solves the preforming difficulties such as local wrinkles of the reinforcing ribs, wrinkles in the transition zone, and verticality of the rib web by implementing differentiated pressure control on different areas of the reinforced wall panel. When preforming reinforced wall panels of different specifications, the air chamber layout and pressure parameters of each area can be adjusted through the human-machine interface of the controller to meet the process requirements of different products.

[0059] Embodiment 4 This embodiment provides an electronic device for implementing the above control method, which can be used as a controller of the above composite material preforming tooling equipment. The electronic device includes a processor and a memory, wherein: The memory is used to store a computer program, which contains program instructions for executing the above control method. Specifically, the memory may include ROM and RAM, which are used to store an operating system, a preset control program and data during operation.

[0060] The processor is connected to the memory and is used to call and execute the computer program stored in the memory. The processor exchanges data with hardware modules such as the air charging and discharging pump, control valve assembly, and pressure sensor through the system bus to realize intelligent control of the composite material preforming tooling equipment.

[0061] In actual applications, the processor can receive control parameters, calculate target air pressure values, control the charging and discharging air pumps, and control the movement of valve components by executing computer programs in the memory, thereby completing the preforming and demolding transfer process of the composite material.

[0062] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. All components not specified in the present invention can be implemented by existing technologies.

Claims

1. A composite material preforming tooling equipment, characterized in that: include: A preformed tooling body, wherein at least one independent air chamber is arranged inside the preformed tooling body; A gas pipeline, comprising a main pipeline connected to the gas charging and discharging pump and at least one branch branched from the main pipeline, wherein at least one branch is connected to at least one of the independent gas chambers in a one-to-one correspondence; A pressure control assembly, the pressure control assembly comprising an air charge and discharge pump, a control valve assembly and a controller, the air charge and discharge pump being in communication with the main pipeline, the control valve assembly comprising at least one branch control valve, at least one branch control valve being arranged one-to-one on at least one branch, the branch control valve being used to control the on and off of the branch, and the controller being electrically connected to the air charge and discharge pump and the control valve assembly; The controller is used to control the actions of the charging and discharging air pump and the control valve assembly to control the air pressure value in each of the independent air chambers, thereby completing the preforming and demolding transfer of the composite material.

2. The composite material preforming tooling equipment according to claim 1, characterized in that: The branch control valve is a solenoid valve, which is electrically connected to the controller via a signal line and is used to receive a switch signal sent by the controller.

3. The composite material preforming tooling equipment according to claim 1, characterized in that: Also includes: A pressure sensor is disposed in each of the independent air chambers, and is used to detect the pressure in the independent air chamber and transmit a detection signal to the controller.

4. The composite material preforming tooling equipment according to claim 1, characterized in that: The independent air chambers are distributed in an array along the interior of the preformed tooling body.

5. The composite material preforming tooling equipment according to claim 1, characterized in that: The controller is built with a preset control program, and the preset control program includes pressure control parameters and pressure control timing of each independent air chamber.

6. The composite material preforming tooling equipment according to claim 1, characterized in that: Also includes: An alignment mechanism is arranged on the preforming tooling body and is used for position alignment between different processes.

7. A method for controlling a composite material preforming tooling device according to any one of claims 1 to 6, characterized in that: include: The controller receives a control parameter, wherein the control parameter is used to control the air pressure value in each of the independent air chambers; The controller controls the air charging and discharging pump and the control valve assembly to charge and discharge each of the independent air chambers based on the control parameters, so as to control the air pressure value of each of the independent air chambers, wherein the air pressure value of each of the independent air chambers can be independently controlled.

8. The control method according to claim 7, characterized in that: Before applying a preset air pressure value to each of the independent air chambers, the method further includes: Obtain three-dimensional model data of composite parts; Calculating the curvature and thickness distribution of each region of the composite material part based on the three-dimensional model data; According to the curvature and thickness distribution, the target air pressure value of each independent air chamber is determined, wherein the air pressure value of the independent air chamber corresponding to the area with larger curvature is greater than the air pressure value of the independent air chamber corresponding to the area with smaller curvature.

9. The control method according to claim 7, characterized in that: When the controller controls the inflation and deflation pump and the control valve assembly to inflate and deflate each of the independent air chambers based on the control parameters, the air pressure value of each of the independent air chambers is sequentially changed according to a preset time sequence, wherein the preset time sequence includes sequentially executing: The first stage: adjusting the air pressure value of each independent air chamber in sequence from the central area to the edge area of ​​the composite material product; The second stage: maintaining the air pressure value stable for a preset time; The third stage: adjusting the air pressure value of each independent air chamber in sequence from the edge area to the central area.

10. An electronic device, characterized in that: include: A memory having a computer program stored therein; A processor, configured to execute the computer program to implement the control method according to any one of claims 7 to 9.

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