Matching method of back lining paper for prepreg tape laying and prepreg tape laying machine

Abstract

The invention relates to a matching method of back lining paper for prepreg tape laying and a prepreg tape laying machine, the matching method is applied to the prepreg tape laying machine, the prepreg tape laying machine comprises an arc-shaped path, and prepreg is separated from the back lining paper after passing through the arc-shaped path; the matching method comprises the following steps: determining a target deflection of the prepreg corresponding to an arc-shaped path; determining the elasticity modulus of the prepreg; determining an actual inertia moment corresponding to the arc-shaped path when the prepreg is actually laid; determining an actual gravity uniform distribution load corresponding to the arc-shaped path when the prepreg is actually laid; according to the elasticity modulus, the actual inertia moment and the actual gravity uniform distribution load of the prepreg, and the actual length and the target deflection of the prepreg corresponding to the arc-shaped path, the adhesive force load of the back lining paper to the prepreg is determined; and the back lining paper needing to be matched is determined according to the adhesive force load and the viscosity of the prepreg, so that the cost of matching the back lining paper is reduced, and the efficiency of matching the back lining paper is improved.

Description

Technical Field

[0001] The present application relates to the technical field of composite material manufacturing, and in particular to a matching method for backing paper for prepreg tape laying and a prepreg tape laying machine. Background Art

[0002] A layer of backing paper is attached to one side of the prepreg for automatic tape laying. When the prepreg is laid for automatic tape laying, the prepreg and its surface backing paper need to pass through an arc path. The reel is used to reel in the backing paper to pull the backing paper to move. The prepreg is transported forward along with the backing paper by the adhesive adhesion between the prepreg and the backing paper.

[0003] On the one hand, to ensure that the prepreg can be separated from the backing paper smoothly during laying, there must be an upper limit to the adhesive force between the two, otherwise the prepreg and the backing paper will be too sticky and the prepreg itself will be delaminated. On the other hand, the prepreg has a certain stiffness, and its bending ability when passing through the above arc path is much lower than that of the soft backing paper. It needs to be assisted by the adhesive force between the backing paper to bend and conform to the shape. Therefore, there must be a lower limit to the adhesive force between the two to ensure that the adhesive force is large enough to counteract the stiffness of the prepreg and avoid premature separation of the prepreg and the backing paper.

[0004] When finalizing the backing paper for tape laying for a certain prepreg configuration, it is necessary to screen them one by one through a large number of trial production and trial evaluation. For other types of prepregs with changed configurations, the surface viscosity and stiffness of the prepregs will change, and the original backing paper is not universal. The backing paper for tape laying needs to be finalized for each prepreg configuration. If the current screening method of large-scale trial production and trial evaluation is still followed, the efficiency is extremely low and the cost is extremely high. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present application aims to provide a method for matching backing paper for prepreg tape laying and a prepreg tape laying machine.

[0006] According to the present application, a matching method for backing paper for prepreg tape laying is provided, the matching method is applied to a prepreg tape laying machine, the prepreg tape laying machine includes an arc path, and the prepreg is separated from the backing paper after passing through the arc path;

[0007] The matching method comprises:

[0008] Determining a target deflection of the prepreg corresponding to the arc path, wherein the target deflection is used to characterize a change in deflection of the prepreg when the prepreg is bonded to the backing paper compared to a horizontal direction;

[0009] Determining the elastic modulus of the prepreg, wherein the elastic modulus is used to characterize the deformation ability of the prepreg under stress;

[0010] Determining an actual moment of inertia of the prepreg corresponding to the arc path when actually laid, wherein the actual moment of inertia is used to characterize the bending resistance of the prepreg when actually laid;

[0011] Determining an actual uniformly distributed gravity load when the prepreg corresponding to the arc path is actually laid, wherein the actual uniformly distributed gravity load is used to characterize the gravity distribution to which the prepreg is subjected when actually laid;

[0012] determining an adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection;

[0013] The backing paper to be matched is determined based on the adhesion load and the viscosity of the prepreg.

[0014] In a possible implementation manner, determining a target deflection of the prepreg corresponding to the arc path includes:

[0015] The target deflection is determined according to the radius of the arc path and the arc length of the arc path.

[0016] In a possible implementation manner, determining the elastic modulus of the prepreg includes:

[0017] The elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test.

[0018] In a possible implementation, the elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test, including:

[0019] Determine the uniformly distributed gravity load of the prepreg during the stiffness test according to the prepreg weight, the cross-sectional area of ​​the prepreg in the horizontal direction and the gravitational acceleration during the stiffness test;

[0020] The moment of inertia of the prepreg during the stiffness test is determined according to the width of the cross section of the prepreg in the vertical direction and the height of the cross section during the stiffness test.

[0021] In a possible implementation manner, determining the actual moment of inertia of the prepreg corresponding to the arc path when actually laid out includes:

[0022] The actual moment of inertia of the prepreg when the prepreg is actually laid out is determined based on the width of the cross section in the vertical direction and the height of the cross section when the prepreg is actually laid out.

[0023] In a possible implementation manner, determining an actual uniformly distributed gravity load when the prepreg corresponding to the arc path is actually laid includes:

[0024] The actual uniformly distributed gravity load of the prepreg during actual placement is determined according to the grammage of the prepreg during actual placement, the cross-sectional area of ​​the prepreg in the horizontal direction corresponding to the arc path, and the gravitational acceleration.

[0025] In a possible implementation, determining the backing paper to be matched according to the adhesion load and the viscosity of the prepreg includes: determining the backing paper to be matched based on preset configuration information, the adhesion load and the viscosity of the prepreg, wherein the preset configuration information is used to characterize the adhesion load corresponding to different prepreg viscosities and different backing paper combinations.

[0026] In a possible implementation, determining the adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection includes:

[0027] When the prepreg is actually laid, the actual deflection of the prepreg corresponding to the arc path is defined as r 1 , the total load on the prepreg corresponding to the arc path is q, the actual length of the prepreg corresponding to the arc path is L, the elastic modulus of the prepreg is E, the actual moment of inertia is I, and the target deflection is r 2 , according to the formula:

[0028] r 1 =(qL 4) / (8EI) to determine the total load on the prepreg.

[0029] In a possible implementation manner, determining the adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection further includes:

[0030] When the prepreg is actually laid, the adhesion load is determined according to the sum of the total load on the prepreg and the actual uniformly distributed gravity load.

[0031] On the other hand, the present application provides a prepreg tape laying machine, which adopts the matching method as described above, and the prepreg tape laying machine comprises:

[0032] An arc-shaped member, wherein an arc-shaped path is provided on the outer periphery of the arc-shaped member, wherein the arc-shaped path has a first end and a second end which are arranged opposite to each other, wherein the first end is the lowest point of the arc-shaped member in the vertical direction, and the first end extends in an arc shape toward the second end, wherein the backing paper moves along the arc-shaped path, and the prepreg is attached to the backing paper, and the prepreg and the backing paper are separated at the second end;

[0033] A reel is used to reel up the backing paper to pull the backing paper and the prepreg to move.

[0034] The advantages of the present application are as follows: In the present application, the elastic modulus of different prepregs is determined, and the elastic modulus reflects the deformation ability of the prepreg when subjected to force. According to the calculation result of the elastic modulus, the adhesion load required for a certain configuration of prepreg to reach the target deflection is calculated, and the adhesion load is the minimum adhesion load for achieving the prepreg and the backing paper to always keep in contact on the arc path. According to the determined adhesion load and the viscosity of the prepreg, the backing paper to be matched is determined. In this way, the backing paper required to match the prepregs of different configurations can be determined by calculation, so that when the prepreg is replaced, the matching backing paper can be quickly selected to avoid the prepreg and the backing paper from being separated in advance on the arc path. The matching method can quickly determine the backing paper matched by the prepregs of different configurations, reduce the cost of matching the backing paper, and improve the efficiency of matching the backing paper, so as to ensure the laying quality and efficiency of the prepregs of different configurations.

[0035] Other features and advantages of the present application will be set forth in the subsequent description, and in part will become apparent from the description, or may be understood through implementation of the present application. The objects and other advantages of the present application may be realized and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, show embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. In these drawings, similar reference numerals are used to identify similar elements. The drawings described below are some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic structural diagram of a prepreg tape laying machine according to an exemplary embodiment;

[0038] Figure 2 is a schematic diagram showing a head end of a prepreg passing through point A according to an exemplary embodiment;

[0039] Figure 3is a schematic diagram of force analysis when the head end of the prepreg passes through point A according to an exemplary embodiment;

[0040] Figure 4 is a schematic diagram showing a head end of a prepreg passing through point B according to an exemplary embodiment;

[0041] Figure 5 is a schematic diagram of force analysis when the head end of the prepreg passes through point B according to an exemplary embodiment;

[0042] Figure 6 is a schematic diagram showing a head end of a prepreg passing through point C according to an exemplary embodiment;

[0043] Figure 7 is a schematic diagram of force analysis when the head end of the prepreg passes through point C according to an exemplary embodiment;

[0044] Figure 8 is a schematic diagram of force analysis of a prepreg when it passes through an arc path according to an exemplary embodiment;

[0045] Fig. 9 right Figure 8 Schematic diagram after flipping;

[0046] Fig.10 is a schematic diagram showing the total load on a prepreg when it passes through an arc path according to an exemplary embodiment;

[0047] Fig.11 is a schematic diagram of various parameters for calculating target deflection according to an exemplary embodiment;

[0048] Fig.12 The figure is a flow chart showing a method for matching backing paper for prepreg tape laying according to an exemplary embodiment.

[0049] Reference numerals:

[0050] 1. Arc-shaped part; 2. Arc-shaped path; 3. Vertical path; 4. Unwinding shaft; 5. Rewinding shaft; 6. Prepreg; 7. Backing paper; 8. Control device. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should be noted that, in the absence of conflict, the embodiments in the present application and the feature vectors in the embodiments can be arbitrarily combined with each other.

[0052] A layer of backing paper is attached to one side of the prepreg for automatic tape laying. When the prepreg is laid for automatic tape laying, the prepreg and its surface backing paper need to pass through an arc path. The reel is used to reel in the backing paper to pull the backing paper to move. The prepreg is transported forward along with the backing paper by the adhesive adhesion between the prepreg and the backing paper.

[0053] When finalizing the backing paper for tape laying for a certain prepreg configuration, it is necessary to screen them one by one through a large number of trial production and trial evaluation. For other types of prepregs with changed configurations, the surface viscosity and stiffness of the prepregs will change, and the original backing paper is not universal. The backing paper for tape laying needs to be finalized for each prepreg configuration. If the current screening method of large-scale trial production and trial evaluation is still followed, the efficiency is extremely low and the cost is extremely high.

[0054] To solve the above technical problems, the present application provides a matching method for backing paper for prepreg tape laying, and determines the target deflection of the prepreg corresponding to the arc path, and the target deflection is used to characterize the change in deflection when the prepreg is attached to the backing paper compared to the horizontal direction. Determine the elastic modulus of the prepreg, and the elastic modulus is used to characterize the deformation ability of the prepreg under stress. Determine the actual moment of inertia of the prepreg corresponding to the arc path when it is actually laid, and the actual moment of inertia is used to characterize the bending resistance of the prepreg when it is actually laid. Determine the actual gravity uniform load when the prepreg corresponding to the arc path is actually laid, and the actual gravity uniform load is used to characterize the gravity distribution of the prepreg when it is actually laid. According to the elastic modulus of the prepreg, the actual moment of inertia, the actual gravity uniform load, the actual length of the prepreg corresponding to the arc path, and the target deflection, determine the adhesion load of the backing paper to the prepreg. The backing paper to be matched is determined according to the adhesion load and the viscosity of the prepreg. The matching method of the present application can quickly determine the backing paper to be matched, thereby facilitating the selection of the backing paper that matches the prepreg, reducing the cost of matching the backing paper and improving the matching efficiency of the backing paper.

[0055] An exemplary embodiment of the present application provides a method for matching backing paper for prepreg tape laying, see Figure 1-Figure 12 ,This matching method is applied to the prepreg tape laying machine.

[0056] like Figure 1 As shown, the prepreg tape laying machine includes an arc-shaped member 1 and a winding shaft 5, and the winding shaft 5 is used to wind up the backing paper 7 to pull the backing paper 7 and the prepreg 6 to move. An arc-shaped path 2 is provided on the periphery of the arc-shaped member 1, and the arc-shaped path 2 has a first end and a second end that are arranged oppositely, the first end is the lowest point in the vertical direction of the arc-shaped member 1, and the first end extends in an arc shape toward the second end, the backing paper 7 moves along the arc-shaped path 2, the prepreg 6 is attached to the backing paper 7, and the prepreg 6 and the backing paper 7 are separated at the second end.

[0057] like Fig.12 As shown, the matching method of the backing paper for prepreg tape laying includes:

[0058] S100, determining a target deflection of the prepreg corresponding to the arc path, wherein the target deflection is used to characterize a change in deflection of the prepreg when the prepreg is bonded to the backing paper compared to a horizontal direction.

[0059] In this step, when the prepreg 6 is actually laid, it is necessary to ensure that the prepreg 6 corresponding to the arc path 2 always keeps in contact with the backing paper 7 on the arc path 2. By characterizing the change in deflection of the prepreg 6 when it is in contact with the backing paper 7 compared to the horizontal direction, the target deflection can be used to determine the vertical displacement of the prepreg 6 corresponding to the second end of the arc path 2 compared to the prepreg 6 corresponding to the first end of the arc path 2 after ensuring that the prepreg 6 runs along the arc path 2.

[0060] S200, determining the elastic modulus of the prepreg, where the elastic modulus is used to characterize the deformation ability of the prepreg under stress.

[0061] In this step, the elastic modulus is used to characterize the deformation ability of the prepreg 6 under stress. For example, the elastic modulus can be calculated using parameter data obtained from a stiffness test.

[0062] S300: determining an actual moment of inertia of the prepreg corresponding to the arc path when actually laid out, where the actual moment of inertia is used to characterize the bending resistance of the prepreg when actually laid out.

[0063] S400: determining an actual uniformly distributed gravity load when the prepreg corresponding to the arc path is actually laid, where the actual uniformly distributed gravity load is used to characterize the gravity distribution to which the prepreg is subjected when actually laid.

[0064] S500, determining the adhesion load of the backing paper to the prepreg according to the elastic modulus, actual moment of inertia, actual uniformly distributed gravity load, actual length of the prepreg corresponding to the arc path, and target deflection of the prepreg.

[0065] S600, determining the backing paper to be matched according to the adhesion load and the viscosity of the prepreg.

[0066] In the matching method of backing paper for prepreg tape laying in the present application, the free end of the prepreg 6 corresponds to the second end of the arc path 2. When the prepreg 6 is actually laid, if the actual deflection of the prepreg 6 corresponding to the arc path 2 is less than the target deflection, the total load actually borne by the free end of the prepreg 6 cannot ensure the dimensional change required for the target deflection, and the problem of premature separation of the prepreg 6 and the backing paper 7 on the arc path 2 will occur.

[0067] When the actual deflection of the prepreg 6 corresponding to the arc path 2 satisfies or is greater than or equal to the target deflection, the total load actually borne by the free end of the prepreg 6 can ensure the dimensional change required by the target deflection, so that the prepreg 6 and the backing paper 7 always remain in contact on the arc path 2, and the problem of premature separation will not occur.

[0068] By determining the target deflection of the prepreg 6 corresponding to the arc path 2, the determined target deflection is used instead of the actual deflection, and the adhesion load of the backing paper 7 to the prepreg 6 is calculated according to the elastic modulus, actual moment of inertia, actual uniform gravity load, actual length of the prepreg 6 corresponding to the arc path 2, and the target deflection of the prepreg 6. The adhesion load is the minimum adhesion load for achieving the prepreg 6 and the backing paper 7 to always remain in contact on the arc path 2. According to the determined adhesion load and the viscosity of the prepreg 6, the backing paper 7 to be matched is determined, and then the backing paper 7 to be matched is obtained. The peeling force is the minimum peeling force required for the backing paper 7 to achieve the prepreg 6 and the backing paper 7 to always remain in contact on the arc path 2. By matching the backing paper 7 with a peeling force greater than the minimum peeling force to achieve the target deflection when the prepreg 6 is attached to the backing paper 7, it is possible to avoid premature separation of the prepreg 6 and the backing paper 7 on the arc path 2. The matching method can quickly determine the backing paper 7 that matches the prepreg 6 of different configurations, thereby reducing the cost of matching the backing paper 7 and improving the efficiency of matching the backing paper 7, thereby ensuring the laying quality and efficiency of the prepreg 6 of different configurations.

[0069] In some embodiments, see Figure 1 The prepreg 6 is unwound from the material shaft and laid. The transmission path it passes through is mainly divided into two sections, namely the vertical path 3 and the arc path 2. The prepreg 6 is attached to the backing paper 7, and the backing paper 7 moves along the periphery of the arc-shaped part 1. The arc path 2 is a part of the periphery of the arc-shaped part 1. During the transmission of the prepreg 6 by automatic tape laying, the periphery of the arc-shaped part 1 is a risk area for the prepreg 6 and the backing paper 7 to separate prematurely. Force analysis is performed on different physical positions of the arc-shaped part 1.

[0070] See also Figure 2-Figure 7 There are three key positions on the periphery of the arc-shaped member 1, namely, a first point A, a second point B and a third point C. The first point A is the position when the tangent direction of the head end of the prepreg 6 is in the vertical direction.

[0071] The second point B is a position where the tangent direction of the head end of the prepreg 6 is between the vertical direction and the horizontal direction.

[0072] The third point C is a position where the tangent direction of the leading end of the prepreg 6 is in the horizontal direction.

[0073] During the transmission process, the prepreg 6 is only subject to two forces, the weight of the prepreg 6 itself and the adhesion of the backing paper 7. The adhesion of the backing paper 7 is always perpendicular to the tangent direction of the head end of the prepreg 6 and the magnitude remains constant. When the prepreg 6 runs along the periphery of the arc-shaped part 1, the adhesion of the backing paper 7 is always toward the center of the arc-shaped part 1. The weight of the prepreg 6 itself is always vertically downward.

[0074] See also Figure 2-Figure 7 , a section at the extreme end of the prepreg 6 is selected as an ideal lever structure, and the moment analysis of gravity is performed on the first point A, the second point B and the third point C.

[0075] See also Figure 2 and Figure 3 , at the first point A, the gravity G 1 The force arm of the fulcrum K of the selected section of prepreg 6 is 0, that is, the gravity G 1 There is no torque acting on the fulcrum K.

[0076] See also Figure 4 and Figure 5 , at the second point B, the gravity G 2 There is a force arm for the fulcrum M of the selected section of prepreg 6, that is, the gravity G at this time 2 There is a moment acting on the fulcrum M, but the force arm is shorter than the length of the selected section of prepreg 6.

[0077] See also Figure 6 and Figure 7 , at the third point C, the gravity G 3 There is a force arm for the fulcrum N of the selected section of prepreg 6, that is, the gravity G at this time 3 There is a moment acting on the fulcrum N, and the force arm is longer than the length of the selected section of prepreg 6.

[0078] From the above, it can be seen that among the first point A, the second point B and the third point C, gravity has a maximum torque on the prepreg 6 only at the third point C. At this time, the counteracting effect of the gravity torque on the adhesion force of the backing paper 7 is the largest, that is, the third point C is the position with the greatest risk of premature separation of the prepreg 6 and the backing paper 7.

[0079] See also Figure 2-Figure 8When the head end of the automatic tape laying prepreg 6 is transported forward in the order of the first point A, the second point B, and the third point C, after passing the third point C, the head end of the prepreg 6 will bend upward along the arc path 2 after the third point C under the action of the adhesion force of the backing paper 7. This bending process is analogized to the mechanical scenario of a cantilever beam bending under the action of a uniform external force. Therefore, the cantilever beam model under the action of a uniform external force is introduced into this embodiment, and a micromechanical analysis is performed on the head end of the prepreg 6 in this embodiment when it just passes the third point C.

[0080] See also Figure 8 , the automatic tape laying prepreg 6 at the third point C can be regarded as the fixed end of the cantilever beam, that is, the fixed end of the prepreg 6, and the third point C corresponds to the first end of the arc path 2. The third point C to the head end of the prepreg 6 is the main body of the cantilever beam, that is, the head end of the prepreg 6 is the free end of the cantilever beam, and the head end of the prepreg 6 corresponds to the second end of the arc path 2. The head end of the prepreg 6 is defined as the free end of the prepreg 6.

[0081] See also Figure 8 , the prepreg 6 corresponding to the arc path 2 is subjected to forces in two directions, one of which is the vertical downward gravity q G , and one is the backing paper adhesion force qs toward the center of the arc path 2. Both forces act as uniform loads on the cantilever beam. As for the backing paper adhesion force qs toward the center of the arc path 2, since the prepreg 6 corresponding to the arc path 2 is extremely short, the backing paper adhesion force qs can be idealized as a completely vertical upward force.

[0082] See 8 and Fig. 9 Since the force model of the traditional cantilever beam under gravity is opposite to the force model of the prepreg 6 in the present application, in order to facilitate subsequent analysis, the force model of the prepreg 6 in the present application is mirror-flipped in the horizontal direction to obtain the force model of the prepreg 6 after horizontal flipping.

[0083] See also Fig.10 , gravity q G It can be expressed as the actual uniformly distributed gravity load q G The backing paper adhesion force qs can be expressed as the adhesion load qs, and the actual gravity uniform load q G Combined with the adhesion load qs, the total load q on the prepreg corresponding to the arc path 2 can be obtained, which can be expressed as:

[0084] q=q S -q G

[0085] In some embodiments, in step S100, determining a target deflection of the prepreg corresponding to the arc path includes:

[0086] The target deflection is determined based on the radius of the arc path and the arc length of the arc path.

[0087] See also Fig.11 In this step, the radius of arc path 2 is defined as R, the arc length of arc path 2 is defined as L, the center of arc path 2 is defined as O, the first end of prepreg 6 is defined as point C, the second end of prepreg 6 is defined as point D, point E and point D are located on the same horizontal plane, and the target deflection between E and C is defined as r. 2 .

[0088] According to the ratio of the arc length L of arc path 2 and the radius R of arc path 2, the size of the central angle ∠DOE in radians corresponding to the arc length L can be determined. According to the trigonometric formula and the radius R of arc path 2, the length of the right-angle side OE can be determined. According to the difference between the radius R of arc path 2 and the right-angle side OE, the length of the right-angle side EC can be determined, and the target deflection r between the right-angle sides EC can be determined. 2 . It can be expressed as:

[0089]

[0090] The radius R of the arc path 2 and the arc length L of the arc path 2 are known values, which can be measured according to the size parameter values ​​of the arc path 2 of the arc-shaped member 1. For example, the radius R of the arc path 2 can be set to 0.1m, and the arc length L of the arc path 2 can be set to 0.01m.

[0091] In this embodiment, for the free end of the automatic tape laying prepreg 6 per unit length, the target deflection r 2 It is quantitative and is not affected by the viscosity and stiffness of the prepreg 6 itself. By determining the target deflection r 2 , to determine the actual deflection r 1 The actual deflection r of the prepreg 6 corresponding to the arc path 2 1 Satisfy greater than or equal to the target deflection r 2 , so that the total load actually borne by the free end of the prepreg 6 can ensure the dimensional change required for the target deflection, so that the prepreg 6 and the backing paper 7 always remain in contact on the arc path 2, and the problem of premature separation will not occur.

[0092] In some embodiments, in step S200, determining the elastic modulus of the prepreg includes:

[0093] The elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test.

[0094] Among them, the uniformly distributed gravity load of the prepreg and the moment of inertia of the prepreg during the stiffness test can be obtained by calculation. During the stiffness test, the length of the prepreg and the deflection of the free end of the prepreg are known quantities and can be obtained through the parameters of the prepreg itself.

[0095] In some embodiments, the elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test, including:

[0096] The uniformly distributed gravity load of the prepreg during the stiffness test is determined according to the prepreg weight, the cross-sectional area of ​​the prepreg in the horizontal direction and the gravitational acceleration during the stiffness test.

[0097] The uniformly distributed gravity load of the prepreg during the stiffness test is defined as q Z , the length of the prepreg during the stiffness test is L 1 , the deflection of the free end of the prepreg during the stiffness test is r G , the moment of inertia of the prepreg during the stiffness test is I 1 The elastic modulus of the prepreg is E, and the area weight of the prepreg during the stiffness test is ρ 1 When testing stiffness, the cross-sectional area of ​​the prepreg in the horizontal direction is A. 1 , the acceleration due to gravity is G.

[0098] The uniformly distributed gravity load of the prepreg during the stiffness test is obtained by multiplying the area weight of the prepreg, the cross-sectional area of ​​the prepreg in the horizontal direction during the stiffness test, and the gravitational acceleration, which is expressed as follows:

[0099] q Z =ρ 1 A 1 G

[0100] Among them, the area weight of the prepreg is 1 is the known parameter value of the prepreg, ρ 1 The acceptable value is 300g / m 2 , the gravitational acceleration G is a known parameter value, and the value of G can be 10m / s 2 , the cross-sectional area A of the prepreg in the horizontal direction during the stiffness test 1 is a known parameter value, which can be obtained by multiplying the length and width of the prepreg during the stiffness test. For example, A 1 The acceptable value is 0.06m 2 .

[0101] In some embodiments, the elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test, including:

[0102] The moment of inertia of the prepreg during the stiffness test is determined according to the width of the cross section of the prepreg in the vertical direction and the height of the cross section during the stiffness test.

[0103] When defining the stiffness test, the width of the vertical section of the prepreg is b. 1 , the height of the cross section in the vertical direction during the stiffness test is h 1 The moment of inertia of the prepreg during the stiffness test is I 1 , the prepreg during stiffness testing is equivalent to a cantilever beam structure.

[0104] The cross section in the vertical direction during the stiffness test is a rectangular cross section, and the width b of the cross section in the vertical direction during the stiffness test is 1 and the height h of the cross section in the vertical direction during the stiffness test 1 And the prepreg moment of inertia I during stiffness test 1 The following relationship is satisfied, which can be expressed as:

[0105]

[0106] Among them, the width b of the cross section in the vertical direction during the stiffness test 1 and the height h of the cross section in the vertical direction during the stiffness test 1 As a known parameter, it can be obtained by measuring the actual size of the prepreg.

[0107] In some embodiments, the prepreg is subjected to a uniformly distributed gravity load q during the stiffness test. Z , the length L of the prepreg during the stiffness test 1 , the deflection r of the free end of the prepreg during the stiffness test G , the moment of inertia of the prepreg during the stiffness test is I 1 And the elastic modulus E of the prepreg satisfies the following relationship, which is expressed by the formula:

[0108]

[0109] Among them, the gravity uniform load q of the prepreg during the stiffness test is Z It can be obtained by multiplying the area weight of the prepreg, the cross-sectional area of ​​the prepreg in the horizontal direction during the stiffness test, and the acceleration of gravity. 1 The width b of the cross section in the vertical direction that can pass the stiffness test 1 and the height h of the cross section in the vertical direction during the stiffness test 1 The deflection r of the free end of the prepreg during the stiffness test is calculated. G is a known quantity, the length L of the prepreg during the stiffness test 1 It is a known quantity and can be obtained by measuring the dimensional parameters of the prepreg.

[0110] In this embodiment, the prepreg is subjected to a stiffness test to obtain the uniformly distributed gravity load q of the prepreg during the stiffness test. Z Prepreg moment of inertia I during stiffness test 1 , the deflection r of the free end of the prepreg is obtained by measuring G The length L of the prepreg during the stiffness test 1 , the above parameter values ​​are substituted into the formula of elastic modulus E to calculate the elastic modulus E of the prepreg, thereby providing necessary parameter values ​​for the subsequent matching of the backing paper. After obtaining the elastic modulus E of the prepreg, the adhesion load of the backing paper to the prepreg is calculated according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniform gravity load, the actual length of the prepreg corresponding to the arc path 2, and the target deflection. The adhesion load is the minimum adhesion load for achieving the prepreg and the backing paper to always remain in contact on the arc path 2. According to the determined adhesion load and the viscosity of the prepreg, the backing paper to be matched is determined, thereby obtaining the backing paper to be matched. The peeling force is the minimum peeling force required for the backing paper to achieve the prepreg and the backing paper to always remain in contact on the arc path 2. By matching the backing paper with a peeling force greater than the minimum peeling force to achieve the target deflection when the prepreg is attached to the backing paper, the prepreg and the backing paper can be avoided from being separated prematurely on the arc path 2. This matching method can quickly determine the backing paper that matches the prepregs of different configurations, reduce the cost of matching the backing paper, and improve the efficiency of matching the backing paper, thereby ensuring the laying quality and efficiency of the prepregs of different configurations.

[0111] In some embodiments, in step S300, determining the actual moment of inertia of the prepreg corresponding to the arc path when actually laid out includes:

[0112] The actual moment of inertia of the prepreg when the prepreg is actually laid out is determined based on the width of the cross section in the vertical direction and the height of the cross section when the prepreg is actually laid out.

[0113] Define the width of the vertical section of the prepreg when it is actually laid as b 2 , the height of the vertical section of the prepreg when it is actually laid is h 2 , the actual moment of inertia of the prepreg when the prepreg is actually laid is I, and the prepreg when the prepreg is actually laid is equivalent to a cantilever beam structure.

[0114] When the prepreg is actually laid, the cross section of the prepreg in the vertical direction is a rectangular cross section. The width b of the cross section in the vertical direction of the prepreg when it is actually laid is 2 and the height h of the cross section in the vertical direction when the prepreg is actually laid 2 The actual moment of inertia I of the prepreg when the prepreg is actually laid out satisfies the following relationship, which can be expressed as:

[0115]

[0116] Among them, the width b of the cross section in the vertical direction when the prepreg is actually laid 2 and the height h of the cross section in the vertical direction when the prepreg is actually laid 2 It is a known parameter and can be obtained by measuring the size of the prepreg during actual placement.

[0117] In some embodiments, in step S400, determining the actual uniformly distributed gravity load of the prepreg corresponding to the arc path 2 when actually laid out includes:

[0118] According to the gram weight of the prepreg during actual placement, the cross-sectional area of ​​the prepreg in the horizontal direction corresponding to the arc path 2 and the gravitational acceleration, the actual gravitational uniform load of the prepreg during actual placement is determined.

[0119] The weight of the prepreg when it is actually laid is defined as ρ 1 , the horizontal cross-sectional area of ​​the prepreg corresponding to the arc path 2 is A 2 , the acceleration due to gravity is G.

[0120] According to the actual prepreg weight during the prepreg laying process ρ 1 The horizontal cross-sectional area of ​​the prepreg corresponding to the arc path 2 is A 2 The product of the gravitational acceleration G is used to obtain the uniformly distributed gravitational load q during the actual placement of the prepreg. G , expressed as:

[0121] q G =ρ 1 A 2 G

[0122] Among them, the prepreg weight when the prepreg is actually laid is ρ 1 is a known parameter value, and the gravitational acceleration G is a known parameter value. The value of G can be 10m / s 2 , the horizontal cross-sectional area A of the prepreg when the prepreg is actually laid 2 is a known parameter value, which can be obtained by multiplying the length and width of the prepreg when the prepreg is actually laid. For example, A 2 The acceptable value is 0.015m 2 .

[0123] In some embodiments, in step S500, the adhesion load of the backing paper to the prepreg is determined according to the elastic modulus, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path 2, and the target deflection, including:

[0124] When the prepreg is actually laid, the actual deflection of the prepreg corresponding to the arc path 2 is defined as r 1 , the total load on the prepreg corresponding to arc path 2 is q, the actual length of the prepreg corresponding to arc path 2 is L, the elastic modulus of the prepreg is E, the actual moment of inertia is I, and the target deflection is r 2 , according to the formula: 1 =(qL 4) / (8EI) to determine the total load q on the prepreg.

[0125] The actual deflection r of the prepreg corresponding to the arc path 2 is 1 Greater than or equal to the target deflection r of the prepreg 2 , which can prevent the prepreg and the backing paper from separating prematurely on the arc path 2. The elastic modulus of the prepreg is E, the actual moment of inertia I, and the target deflection r 2 It can be calculated by the formula that the actual length of the prepreg corresponding to the arc path 2 is L, which is a known parameter value and can be obtained by measuring the actual size parameters of the prepreg. 2 Instead of the actual deflection r 1 , the calculated target deflection r 2 Substitute the value of into the formula r 1 =(qL 4) / (8EI), according to the target deflection r 2 , the total load q borne by the prepreg, the actual length L of the prepreg corresponding to the arc path 2, the elastic modulus E of the prepreg and the actual moment of inertia I, in order to calculate the total load q borne by the prepreg, the total load q borne by the prepreg is the minimum value of the total load q borne by the prepreg so that the prepreg and the backing paper always keep in contact on the arc path 2.

[0126] In some embodiments, in step S500, the adhesion load of the backing paper to the prepreg is determined according to the elastic modulus, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection, further comprising:

[0127] When the prepreg is actually laid, the adhesion load is determined by summing the total load on the prepreg and the actual uniformly distributed gravity load.

[0128] Where, the adhesion load is defined as q S , the total load q on the prepreg and the actual uniformly distributed load q G The sum of the two is equal to the adhesion load q S , expressed as:

[0129] q+q G =q S

[0130] According to the target deflection r 2 , the total load q on the prepreg, the actual length L of the prepreg corresponding to the arc path 2, the elastic modulus E of the prepreg and the actual moment of inertia I, the total load q on the prepreg is calculated, and the total load q on the prepreg is the minimum value of the total load q on the prepreg to achieve the prepreg and the backing paper always keep in contact on the arc path 2. Substitute the total load q on the prepreg into the above formula to obtain the adhesion load q S . The adhesion load is the minimum adhesion load for achieving the prepreg and the backing paper to always remain in contact on the arc path 2. According to the determined adhesion load and the viscosity of the prepreg, the peeling force that the backing paper to be matched should meet is determined, and then the backing paper to be matched is obtained. The peeling force is the minimum peeling force required for the backing paper to achieve the prepreg and the backing paper to always remain in contact on the arc path 2. By matching the backing paper with a peeling force greater than the minimum peeling force to achieve the target deflection when the prepreg is in contact with the backing paper, the prepreg and the backing paper can be avoided from being separated prematurely on the arc path 2. This matching method can quickly determine the backing paper that matches the prepregs of different configurations, reduce the cost of matching the backing paper, and improve the efficiency of matching the backing paper, thereby ensuring the laying quality and efficiency of the prepregs of different configurations.

[0131] In some embodiments, in step S600, determining the backing paper to be matched according to the adhesion load and the viscosity of the prepreg includes:

[0132] Based on the preset configuration information, the adhesion load and the viscosity of the prepreg, the backing paper to be matched is determined. The preset configuration information is used to characterize the adhesion load corresponding to the combination of different prepreg viscosities and different backing papers.

[0133] In this step, backing papers with different release forces are matched respectively to prepregs with different viscosities, the release forces corresponding to the different backing papers are determined, and the adhesion loads corresponding to the combinations of different prepreg viscosities and different backing paper release forces are determined, thereby obtaining preset configuration information, and then the required matching backing paper is determined based on the preset configuration information, the adhesion loads between different backing papers and prepregs, and the viscosity of the prepregs.

[0134] The process of obtaining the preset configuration information can be carried out through experimental testing or simulation. In the experimental testing method, a variety of prepregs with different viscosities and a variety of backing papers with different peeling forces can be selected for combination, and the peeling force data and the corresponding adhesion load in each test group can be recorded. Through a large amount of experimental data, a query table of adhesion loads corresponding to different combinations of prepreg viscosities and different backing papers can be statistically obtained, thereby constructing the preset configuration information.

[0135] In this embodiment, the elastic modulus of different prepregs is obtained by stiffness test, and the elastic modulus reflects the deformation ability of the prepreg when subjected to force. According to the calculation result of the elastic modulus, the target deflection r of a certain configuration prepreg is calculated. 2 The required adhesion load is the minimum adhesion load for achieving the prepreg and the backing paper to always keep in contact on the arc path 2. According to the determined adhesion load and the viscosity of the prepreg, the backing paper to be matched is determined. The matching method of the present application can determine the backing paper required to match the prepregs of different configurations by calculation, so as to facilitate the rapid selection of the matching backing paper when the prepreg is replaced, so as to avoid the prepreg and the backing paper from being separated in advance on the arc path 2. The matching method can quickly determine the backing paper matched with the prepregs of different configurations, reduce the cost of matching the backing paper, and improve the efficiency of matching the backing paper, so as to ensure the laying quality and efficiency of the prepregs of different configurations.

[0136] In an exemplary embodiment of the present application, a prepreg tape laying machine is provided, which adopts the matching method of the backing paper for prepreg tape laying. Figure 1 The prepreg tape laying machine includes an arc-shaped member 1 and a winding shaft 5. The winding shaft 5 is used to wind up the backing paper 7 to pull the backing paper 7 and the prepreg 6 to move. An arc-shaped path 2 is provided on the periphery of the arc-shaped member 1. The arc-shaped path 2 has a first end and a second end that are arranged oppositely. The first end is the lowest point of the arc-shaped member 1 in the vertical direction. The first end extends in an arc shape toward the second end. The backing paper 7 moves along the arc-shaped path 2. The prepreg 6 adheres to the backing paper 7. The prepreg 6 and the backing paper 7 are separated at the second end.

[0137] The prepreg tape laying machine further comprises a reel 4 , around which the prepreg 6 and the backing paper 7 which are arranged in close contact with each other are wound.

[0138] The prepreg tape laying machine also includes a conveying mechanism, which is used to convey the prepreg 6 and the backing paper 7 to the arc-shaped member 1 and the winding shaft 5.

[0139] The prepreg tape laying machine further comprises a control device 8, which is respectively connected to the unwinding shaft 4 and the reeling shaft 5 by signals, and is used to control the operation of the unwinding shaft 4 and the reeling shaft 5.

[0140] The control device 8 may be a computer device including a communication component and a processor, and the control device 8 may control the unwinding shaft 4 to rotate at a target rate to lay the tape, and control the reeling shaft 5 to rotate at a target rate to reel the backing paper 7.

[0141] The prepreg tape laying machine of this embodiment adopts the matching method of the backing paper for prepreg tape laying described above, and ensures that the prepreg 6 and the backing paper 7 can be closely attached to each other during the tape laying process by accurately calculating the matching relationship between the configuration of the prepreg 6 and the backing paper 7, and can be smoothly separated after passing through the arc path 2. The application of this method not only improves the test efficiency of matching the backing paper 7 with the prepreg 6, but also reduces the production cost, and ensures the laying quality and efficiency of prepregs 6 with different configurations.

[0142] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. The present application is described in detail with reference to the preferred embodiments only. Those skilled in the art should understand that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A method for matching backing paper for prepreg tape laying, characterized in that: The matching method is applied to a prepreg tape laying machine, the prepreg tape laying machine includes an arc path, and the prepreg is separated from the backing paper after passing through the arc path; The matching method comprises: Determine a target deflection of the prepreg corresponding to the arc path, wherein the target deflection is used to characterize a change in deflection of the prepreg when the prepreg is bonded to the backing paper compared to a horizontal direction; Determining the elastic modulus of the prepreg, wherein the elastic modulus is used to characterize the deformation ability of the prepreg under stress; Determining an actual moment of inertia of the prepreg corresponding to the arc path when actually laid, wherein the actual moment of inertia is used to characterize the bending resistance of the prepreg when actually laid; Determining an actual uniformly distributed gravity load when the prepreg corresponding to the arc path is actually laid, wherein the actual uniformly distributed gravity load is used to characterize the gravity distribution to which the prepreg is subjected when actually laid; determining an adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection; The backing paper to be matched is determined based on the adhesion load and the viscosity of the prepreg.

2. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: The determining a target deflection of the prepreg corresponding to the arc path comprises: The target deflection is determined according to the radius of the arc path and the arc length of the arc path.

3. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: Determining the elastic modulus of the prepreg comprises: The elastic modulus of the prepreg is determined according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test.

4. The method for matching backing paper for prepreg tape laying according to claim 3, characterized in that: Determining the elastic modulus of the prepreg according to the uniformly distributed gravity load of the prepreg, the length of the prepreg, the deflection of the free end of the prepreg, and the moment of inertia of the prepreg during the stiffness test includes: Determine the uniformly distributed gravity load of the prepreg during the stiffness test according to the prepreg weight, the cross-sectional area of ​​the prepreg in the horizontal direction and the gravitational acceleration during the stiffness test; The moment of inertia of the prepreg during the stiffness test is determined according to the width of the cross section of the prepreg in the vertical direction and the height of the cross section during the stiffness test.

5. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: The determining of the actual moment of inertia of the prepreg corresponding to the arc path when actually laid out comprises: The actual moment of inertia of the prepreg when the prepreg is actually laid out is determined based on the width of the cross section in the vertical direction and the height of the cross section when the prepreg is actually laid out.

6. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: The determining of the actual uniformly distributed gravity load when the prepreg corresponding to the arc path is actually laid includes: The actual uniformly distributed gravity load of the prepreg during actual placement is determined according to the grammage of the prepreg during actual placement, the cross-sectional area of ​​the prepreg in the horizontal direction corresponding to the arc path, and the gravitational acceleration.

7. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: The method of determining the backing paper to be matched according to the adhesion load and the viscosity of the prepreg includes: determining the backing paper to be matched based on preset configuration information, the adhesion load and the viscosity of the prepreg, wherein the preset configuration information is used to characterize the adhesion load corresponding to different prepreg viscosities and different backing paper combinations.

8. The method for matching backing paper for prepreg tape laying according to claim 1, characterized in that: The step of determining the adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection comprises: When the prepreg is actually laid, the actual deflection of the prepreg corresponding to the arc path is defined as r1, the total load on the prepreg corresponding to the arc path is defined as q, the actual length of the prepreg corresponding to the arc path is defined as L, the elastic modulus of the prepreg is defined as E, the actual moment of inertia is defined as I, and the target deflection is defined as r2, according to the formula: r1=(qL 4) / (8EI) to determine the total load on the prepreg.

9. The method for matching backing paper for prepreg tape laying according to claim 8, characterized in that: The method of determining the adhesion load of the backing paper to the prepreg according to the elastic modulus of the prepreg, the actual moment of inertia, the actual uniformly distributed gravity load, the actual length of the prepreg corresponding to the arc path, and the target deflection, further includes: When the prepreg is actually laid, the adhesion load is determined according to the sum of the total load on the prepreg and the actual uniformly distributed gravity load.

10. A prepreg tape laying machine, using the matching method according to any one of claims 1 to 9, characterized in that: The prepreg tape laying machine comprises: An arc-shaped member, wherein an arc-shaped path is provided on the outer periphery of the arc-shaped member, wherein the arc-shaped path has a first end and a second end which are arranged opposite to each other, wherein the first end is the lowest point of the arc-shaped member in the vertical direction, and the first end extends in an arc shape toward the second end, wherein the backing paper moves along the arc-shaped path, and the prepreg is attached to the backing paper, and the prepreg and the backing paper are separated at the second end; A reel is used to reel up the backing paper to pull the backing paper and the prepreg to move.

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