Method for controlling the deformation of a roll of fibrous fabric and forming die therefor

Abstract

The present application relates to a kind of fiber fabric winding deformation control method and its forming die.The control method includes steps S1: according to the design position of fiber fabric winding on forming die, several positioning pins arranged on the surface of forming die are lifted;Step S2: fiber fabric is wound on forming die, so that several intersection points of warp tracer yarn and weft tracer yarn arranged on fiber fabric correspond to the positioning pin;Step S3: the positioning pin that has been lifted is withdrawn;Step S4: fiber fabric is wrapped with fixed mold, resin is injected after vacuumizing.The present application proposes a kind of fiber fabric winding deformation control method and its forming die, ensure that the fiber deformation of fiber fabric everywhere on it meets the design requirements in winding process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiber fabric manufacturing, in particular to a fiber fabric winding deformation control method and a forming die thereof. BACKGROUND

[0002] Fiber reinforced resin matrix composite material is one of the most important materials for aviation structure. With the increasing proportion of composite materials in the application of aircraft, the size of the composite material component also increases. The traditional manual laying of prepreg uses laser projection equipment to mark the outline of the position where the prepreg is to be laid. At present, the laying process of dry fiber fabric generally places tracer yarn on the surface of the fiber fabric, and aligns the tracer yarn with the laser projection outline during laying to complete the laying of the fiber fabric.

[0003] Using fiber fabric to manufacture composite components, such as using RTM forming, can greatly reduce manufacturing cost; three-dimensional reinforced fiber fabric can also integrally form complex structure composite parts.

[0004] When using fiber fabric to manufacture composite components with variable curvature and variable diameter, the fiber fabric needs to be twisted, wound, compacted and deformed to meet the forming requirements. When twisting and winding, the traditional laser projection + tracer yarn technology is usually used to complete the deformation of the fiber fabric, but this method can only ensure the deformation of the fabric at the position of the tracer yarn, and ensure that the woven structure of the fabric at this position is deformed to be consistent with the design. It cannot accurately control other positions except the position of the tracer yarn, and cannot ensure that the fiber deformation at all positions of the composite part meets the design requirements. When the position of the tracer yarn does not match the position of the laser projection, only the deviation value can be obtained by manual measurement, and then the tracer yarn of the next fiber fabric or the fiber fabric is adjusted according to the deviation value. Real-time adjustment cannot be made on the current fiber fabric. SUMMARY

[0005] In view of the above problems of the prior art, the present application provides a fiber fabric winding deformation control method and a forming die, which can ensure that the fiber deformation at all positions of the fiber fabric meets the design requirements.

[0006] Specifically, the present application provides a control method for fiber fabric winding deformation, comprising:

[0007] Step S1: lifting a plurality of positioning pins arranged on the surface of a forming die according to the designed position of the fiber fabric wound on the forming die;

[0008] Step S2: winding the fiber fabric on the forming die, so that a plurality of intersection points of the warp tracer yarn and the weft tracer yarn arranged on the fiber fabric correspond to the positioning pins;

[0009] Step S3: retract the raised positioning pins;

[0010] Step S4: wrap the fiber fabric with a fixed mold, inject resin after vacuumizing.

[0011] According to one embodiment of the present application, in the design position, the intersection point corresponds to the position of the positioning pin.

[0012] According to one embodiment of the present application, the positioning pin adjusts its height by air pressure, so that the positioning pin protrudes from the surface of the forming mold by a set distance.

[0013] According to one embodiment of the present application, the set distance is greater than or equal to zero and less than or equal to 100 mm.

[0014] According to one embodiment of the present application, in step S3, the raised positioning pin is retracted so that the top of the positioning pin is flush with the surface of the forming mold.

[0015] According to one embodiment of the present application, after step S4, the fiber fabric is cured by heating and pressurizing.

[0016] The present application also provides a forming mold comprising an air pressure control device and a plurality of positioning pins, the positioning pins being arranged on the surface of the forming mold, the air pressure control device being used to raise and lower the positioning pins, the air pressure control device raising the positioning pins so that the positioning pins protrude from the surface of the forming mold by a set distance, and the air pressure control device lowering the positioning pins so that the top of the positioning pins is flush with the surface of the forming mold.

[0017] According to one embodiment of the present application, the air pressure control device is connected to the positioning pins through a vacuum conduit.

[0018] According to one embodiment of the present application, the movement direction of the positioning pins is perpendicular to the surface of the forming mold.

[0019] According to one embodiment of the present application, the set distance is greater than or equal to zero and less than or equal to 100 mm.

[0020] The present application provides a fiber fabric winding deformation control method and a forming mold thereof, positioning pins are arranged on the forming mold, the positions of the positioning pins correspond to the intersection points of the tracer yarns in the radial and weft directions of the fiber fabric, so as to control and adjust the positioning of the intersection points, to ensure that the fiber deformation of the fiber fabric during winding meets the design requirements.

[0021] It should be understood that the above general description and the following detailed description of the present application are exemplary and illustrative, and are intended to provide further explanation of the present application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute apart of this application, illustrate embodiments of the present application, and together with the description serve to explain the principles of the present application. In the drawings:

[0023] Figure 1 A flow chart of a control method of an embodiment of the present application is shown.

[0024] Figure 2 A structural schematic diagram of a forming mold of an embodiment of the present application is shown.

[0025] Figure 3 A state diagram of fiber fabric winding of an embodiment of the present application is shown.

[0026] Figure 4 is Figure 3 A schematic diagram of fiber deformation of fiber fabric during winding is shown. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments disclosed in this application and the characteristics in the embodiments can be combined with each other without conflict.

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0030] The foregoing is a summary and thus contains only the most basic embodiment. The application can be practiced with the specific embodiments and options described herein, and it can also be practiced without such specific embodiments and options. Furthermore, the preceding description and drawings should not be construed as limiting the application. Numerous and various embodiments can be derived from this description without departing from the application. The description and drawings are illustrative only, and the scope of the application is defined only by the appended claims. The embodiments described herein are intended to be merely illustrative of the principles of the application. Numerous modifications may

[0031] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0032] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0033] In addition, it should be noted that the use of the terms "first", "second" and the like, to describe various elements in the application, is merely intended to differentiate one element from another, and is not intended to imply a special meaning for the term itself. Unless otherwise stated, the above terms are not to be interpreted in a limiting sense. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be created by the applicant in his or her own judgment. In addition, it should be noted that the terms used in the present application are not intended to limit the scope of the present application, and should be interpreted as including all the meanings derived from the terms under the knowledge of a skilled person in the relevant art.

[0034] Figure 1 A flow chart of the control method of one embodiment of the present application is shown. As shown in the figure, a control method of fiber fabric winding deformation, comprising:

[0035] Step S1: According to the design position of the fiber fabric winding on the forming mold, the positioning pins arranged on the surface of the forming mold are lifted. It is easy to understand that the positioning pins can be arranged on the surface of the forming mold, and in the initial state, the top of the positioning pin is level with the surface of the forming mold. The positioning pins can be lifted according to the design requirements to make the positioning pins protrude from the surface of the forming mold.

[0036] Step S2: winding the fiber fabric on the forming mold, so that the intersection points of the warp tracer yarn and the weft tracer yarn arranged on the fiber fabric correspond to the positioning pins. The fiber fabric is wound around the axis of the forming mold. The fiber fabric is woven with warp tracer yarn and weft tracer yarn, that is, the existing tracer yarn technology is used to weave the fiber fabric. The intersection points of the warp tracer yarn and the weft tracer yarn form the intersection points of the tracer yarn. One or more of these intersection points need to be deformed in the design position, so during the winding process, the intersection points of the tracer yarn that need to be deformed must be covered on the positioning pins that have been lifted. In this way, the winding of the entire fiber fabric is completed.

[0037] Step S3: retract the lifted positioning pins to return the positioning pins to the initial position.

[0038] Step S4: wrapping the fiber fabric with a fixing mold, injecting resin after vacuumizing, and preparing for curing the fiber fabric.

[0039] Preferably, in the winding design position of the fiber fabric, the intersection points of the fiber fabric correspond to the positions of the positioning pins. The positioning pins are lifted to make the surface of the fiber fabric deformed to meet the design requirements, and the action point of the positioning pins is the intersection point of the warp tracer yarn and the weft tracer yarn on the fiber fabric. The core of the control method of fiber fabric winding deformation provided by the present application is to make the surface of the fiber fabric deformed by the positioning pins to meet the design requirements.

[0040] Preferably, the positioning pins are adjusted in height by air pressure control so that the positioning pins protrude from the surface of the forming mold by a set distance. It is understood that both the raising and lowering of the positioning pins can be controlled by air pressure so as to be precisely adjusted in position.

[0041] Preferably, the set distance of the positioning pins is greater than or equal to zero and less than or equal to 100 mm.

[0042] Preferably, in step S3, the raised positioning pins are retracted so that the top of the positioning pins is flush with the surface of the forming mold. After the fiber fabric is wound, the raised positioning pins are retracted so that the positioning pins are substantially retracted into the forming mold and the injection molding space reserved for the fiber fabric is maintained.

[0043] Preferably, after step S4, the fiber fabric is cured by heating and pressurizing.

[0044] Figure 2 A schematic view of the structure of a forming mold according to an embodiment of the present application is shown. The present application also provides a forming mold suitable for the control method of fiber fabric winding deformation described above. As shown in Figure 2 The forming mold 1 includes an air pressure control device 10 and a plurality of positioning pins 7, 8, 9. The positioning pins 7, 8, 9 are arranged on the surface of the forming mold 1, which is equivalent to having spaces on the surface of the forming mold 1 to accommodate the positioning pins 7, 8, 9. Figure 2 In the embodiment shown in the figure, only three positioning pins 7, 8, 9 are shown schematically. The air pressure control device 10 is used to control the raising and lowering of the positioning pins 7, 8, 9. The air pressure control device 10 raises the positioning pins 7, 8, 9 so that the positioning pins 7, 8, 9 protrude from the surface of the forming mold 1 by a set distance, and the air pressure control device 10 lowers the positioning pins 7, 8, 9 so that the top of the positioning pins 7, 8, 9 is flush with the surface of the forming mold 1. It is easily understood that in the initial state, the top of the positioning pins 7, 8, 9 is flush with the surface of the forming mold 1. In other words, in the initial state, the surface of the forming mold 1 does not have any protruding parts. The selection of which positioning pin to raise and the specific height of the raised positioning pin are determined by the air pressure control device 10. In this embodiment, the air pressure control device 10 is preferably arranged inside the forming mold 1.

[0045] Conventionally, the forming mold 1 is a fixed shape tool. The forming mold 1 provided by the present application has the positioning pins 7, 8, 9 arranged thereon, which is equivalent to providing a forming mold 1 with a changeable surface shape. The height of the positioning pins 7, 8, 9 can be adjusted according to design requirements, thereby changing the surface profile of the forming mold 1 to make the deformation of the fiber fabric meet the design requirements.

[0046] Preferably, the pneumatic control device 10 is connected to the positioning pins 7 via a vacuum conduit 11. Gas is continuously introduced into the vacuum conduit 11, generating pressure that pushes the positioning pins 7, 8, and 9 upwards. By evacuating the vacuum conduit 11 to create negative pressure, the positioning pins 7, 8, and 9 can be lowered, effectively absorbing or retracting them, returning them to their initial positions to maintain the same height as the outer surface of the forming mold 1.

[0047] Preferably, the moving direction of the positioning pins 7, 8, and 9 is perpendicular to the surface of the forming mold 1 to ensure that the intersection of the tracer yarn of the fiber fabric meets the deformation requirements.

[0048] Preferably, the setting distance between the locating pins 7, 8, and 9 is greater than or equal to zero and less than or equal to 100 mm.

[0049] Figure 3 A diagram showing the state of the fiber fabric 6 wound according to an embodiment of the present invention is provided. Figure 4 yes Figure 3 A schematic diagram of fiber deformation during the winding process of a fibrous fabric. The following is combined with... Figure 1 and Figure 2 The following describes in detail the specific implementation process of a method for controlling the winding deformation of a fiber fabric 6 according to the present invention.

[0050] 1) such as Figure 3 As shown, in a flat state, the fiber fabric 6 (prefab) is interwoven with warp tracer yarns 3, 4, 5 and weft tracer yarns 2 at intervals, and the two intersect to form tracer yarn intersection points 42, 32, 52;

[0051] 2) Based on the designed positions of the tracer yarn intersections 42, 32, and 52 after winding and laying, positioning pins 7, 8, and 9 are set on the outer surface of the molding die 1. Pressure is applied to the positioning pins 7, 8, and 9 through the pneumatic control device 10, and the pressure is transmitted to the positioning pins 7, 8, and 9 through the vacuum conduit 11. As the pressure increases, the height of the positioning pins 7, 8, and 9 increases. Before applying pressure, the initial height of the positioning pins 7, 8, and 9 is equal to the height of the outer surface of the molding die 1. Figure 2 When pressure is applied to locating pins 7 and 9, locating pin 8 is pushed up, increasing its height, as shown in the image. Figure 2 As shown. Pressure can be applied to one, several, or all locating pins according to actual design needs, allowing for adjustment of the specific lifting height of each locating pin.

[0052] It should be noted that the locating pins 7, 8, and 9 can be made of engineering materials with sufficient rigidity, such as steel or plastic.

[0053] 4) Next, the forming mold 1 and the fiber fabric 6 are rotated by the motor, so that the fiber fabric 6 is wound on the forming mold 1. The forming mold 1 is usually a ring-shaped member with variable diameter, so that several intersection points 42, 32, 52 of the warp tracer yarns 3, 4, 5 and the weft tracer yarn 2 provided on the fiber fabric 6 correspond to the positioning pins 7, 8, 9. As shown in Figure 4 the fiber fabric 6 is wound, the intersection points 42, 32, 52 of the warp tracer yarns 3, 4, 5 and the weft tracer yarn 2 are deformed to cover the positioning pins 7, 8, 9, the positioning pins 7, 8, 9 pass through and support the intersection points 42, 32, 52 of the tracer yarns, the initial positions of the warp tracer yarns 3, 4, 5 and the weft tracer yarn 2 are changed to reach the positions of the warp tracer yarns 3', 4', 5' and the weft tracer yarn 2'. That is, the tracer yarn intersection points 42, 32, 52 are corrected to the design positions 4'2', 3'2', 5'2' to meet the requirements of the winding design positions.

[0054] 5) The fiber fabric 6 is continuously wound until the tail end thereof, so that all the warp tracer yarns 3, 4, 5 and the weft tracer yarn 2 are in the design positions after deformation, and the tail end of the fiber fabric 6 is fixed;

[0055] 6) The positioning pins 7, 8, 9 are sucked back and contracted by using the air pressure control device 10 to generate negative pressure, until the top ends of the positioning pins 7, 8, 9 are flush with the outer surface of the forming mold 1;

[0056] 7) The fiber fabric 6 and the forming mold 1 are wrapped by using a solid mold (or a flexible mold), and resin is injected after vacuumizing;

[0057] 8) The fiber fabric 6 is solidified by heating and pressurizing.

[0058] The fiber fabric winding deformation control method and the forming mold provided by the present application are aimed at placing warp and weft tracer yarns on the surface of the fiber fabric, and setting positioning pins on the forming mold, the positions of the positioning pins corresponding to the intersection points of the tracer yarns. The initial height of the positioning pins is equal to the outer surface of the forming mold, the air pressure control device in the center of the forming mold is pressurized, the air pressure control device is connected with the positioning pins through a vacuum conduit, as the pressure increases, the positioning pins are extended out of the surface of the forming mold to a set height, the fiber fabric is wound / laid on the forming mold, the positioning pins pass through and support the intersection points of the tracer yarns on the fiber fabric, the positions of the warp and weft yarns of the fiber fabric which do not meet the design deformation are corrected, the winding amount of each tracer yarn intersection point is accurately controlled and adjusted in the radial and weft directions, so that the positions of the tracer yarns of the fiber fabric are kept within the design deviation during the winding / laid process.

[0059] As will be apparent to those of ordinary skill in the art, various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A method for controlling the winding deformation of a fiber fabric, comprising: Step S1: lifting a plurality of positioning pins arranged on the surface of a forming mold according to the designed position of the fiber fabric wound on the forming mold; Step S2: winding the fiber fabric on the forming mold, so that a plurality of intersection points of the warp tracer yarn and the weft tracer yarn arranged on the fiber fabric correspond to the positioning pins; Step S3: retracting the positioning pins that have been lifted; Step S4: wrapping the fiber fabric with a stationary mold, and injecting resin after vacuumizing.

2. The control method according to claim 1, characterized by, In the designed position, the intersection points correspond to the positions of the positioning pins.

3. The control method according to claim 1, characterized by, The height of the positioning pins is adjusted by air pressure, so that the positioning pins protrude from the surface of the forming mold by a set distance.

4. The control method according to claim 3, characterized by, The set distance is greater than or equal to zero and less than or equal to 100 mm.

5. The control method according to claim 1, characterized by, In Step S3, the positioning pins that have been lifted are retracted, so that the top of the positioning pins is level with the surface of the forming mold.

6. The control method according to claim 1, characterized by, After Step S4, the fiber fabric is cured by heating and pressurizing.

7. A forming mold for realizing the control method of fiber fabric winding deformation according to claim 1, characterized by, An air pressure control device is arranged on the surface of the forming mold where the positioning pins are arranged, and the air pressure control device is used to lift and lower the positioning pins, the air pressure control device lifts the positioning pins so that the positioning pins protrude from the surface of the forming mold by a set distance, and the air pressure control device lowers the positioning pins so that the top of the positioning pins is level with the surface of the forming mold.

8. The forming mold of claim 7, wherein, The air pressure control device is connected to the positioning pins through a vacuum conduit.

9. The forming mold of claim 7, wherein, The moving direction of the positioning pins is perpendicular to the surface of the forming mold.

10. The forming mold of claim 7, wherein The set distance is greater than or equal to zero and less than or equal to 100 mm.

Images