Testing device for evaluating prepreg
By bending the prepreg sheet at a larger angle, small bending interference during transportation and cutting is eliminated, testing accuracy is improved, the problem of the impact of the number of bulging on the surface of the prepreg sheet is solved, and production losses are reduced.
Patent Information
- Application Number
- CN202421810337.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-29
AI Technical Summary
In the prior art, the number of bulging on the surface of the prepreg sheet is easily affected by small bending during transportation and cutting, resulting in a deviation from the actual situation, affecting product yield and increasing production losses.
A test device for evaluating prepregs is provided. By bending the prepregs at a larger angle, it eliminates small bending interference during transportation and cutting, and uses a storage table, baffle and limiting plate to clamp the prepregs to make them appear in a fixed bending state.
It improves the accuracy of prepreg sheet testing, can more truly reflect its actual performance, helps to adjust the production process in a timely manner and reduces production losses.
Smart Images
Figure CN223091670U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of prepreg inspection, and particularly relates to a test device for evaluating prepregs. Background Art
[0002] A prepreg refers to a composition made by impregnating continuous fibers or fabrics with a resin matrix under strictly controlled conditions, and is an intermediate material for manufacturing composite materials. During the laying process, the bulging condition on the surface of the prepreg is one of the important physical and chemical properties of the prepreg, and is of great significance for the laying and on-machine evaluation of the prepreg.
[0003] In related technologies, the bulging condition of prepregs is often evaluated by cutting the prepreg into prepreg sheets of a certain area and counting the number of bulges generated on the surface of the prepreg sheets. However, the number of bulges on the surface of the prepreg sheets is easily affected by small bends generated during the transportation and cutting of the prepregs, resulting in its inability to accurately reflect the performance of the prepregs, and there will be a problem that the test situation deviates from the actual situation, thereby leading to a decrease in product yield and an increase in production losses. Utility Model Content
[0004] In order to overcome the above-mentioned drawbacks of the prior art, the present disclosure aims to provide a test device for evaluating prepregs. The test device includes:
[0005] A placement table is provided with a receiving groove extending in a first direction. The receiving groove is used to receive a prepreg sheet. Along the first direction, a first baffle is provided on one side of the placement table, and the prepreg sheet abuts against the first baffle.
[0006] A second baffle is provided on the side of the placement table away from the first baffle. The second baffle can slide along the first direction. When the second baffle is in a predetermined position, the second baffle and the first baffle jointly clamp the prepreg sheet, so that the prepreg sheet is in a bent state.
[0007] In some possible embodiments, the placement table is further provided with two limiting plates arranged at intervals along a second direction. The limiting plates extend along the first direction, and a receiving groove is formed between the two limiting plates, wherein the second direction is perpendicular to the first direction.
[0008] In some possible embodiments, scale lines are provided on the limiting plates.
[0009] In some possible embodiments, the height of the limiting plates is greater than or equal to 0.5 cm.
[0010] In some possible embodiments, the heights of the first baffle and the second baffle are greater than or equal to the height of the limiting plates.
[0011] In some possible embodiments, the prepreg sheet is rectangular, and the length of the limiting plate is greater than or equal to twice the length of the rectangle.
[0012] In some possible embodiments, there is a first distance between the predetermined position and the first baffle, the first distance is less than the length of the rectangle, and the first distance is greater than or equal to 4 / 5 of the length of the rectangle.
[0013] In some possible embodiments, the prepreg sheet is a square with a side length of 150 mm, and the length of the limiting plate is 300 mm.
[0014] In some possible embodiments, the second baffle is connected to a handle, and the handle is disposed on a side of the second baffle away from the first baffle.
[0015] In some possible embodiments, a release film is disposed on one side of the prepreg sheet. When the prepreg sheet is received in the receiving groove, the side with the release film contacts the bottom surface of the receiving groove.
[0016] The advantages of the present disclosure are as follows: By bending the prepreg sheet at a large angle, the present disclosure eliminates the interference caused by small bends generated during transportation, cutting, etc. of the prepreg sheet to the test evaluation, improves the accuracy of the prepreg sheet test, is conducive to timely adjusting the production process according to the actual situation of the prepreg sheet, improves the production efficiency, and reduces the production loss.
[0017] Other features and advantages of the present disclosure will be described in subsequent descriptions, and, in part, will be obvious from the description, or will be understood by implementing the present disclosure. The objectives and other advantages of the present disclosure can be realized and obtained through the structures specifically pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings incorporated into the description and constituting a part of the description illustrate embodiments of the present disclosure and, together with the description, are used to explain the principles of the present disclosure. In these drawings, like reference numerals are used to identify like elements. The following drawings are some embodiments of the present disclosure, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0019] Figure 1 is a perspective view of a test device shown according to an exemplary embodiment.
[0020] Figure 2 is a side view of a test device shown according to an exemplary embodiment.
[0021] Figure 3 It is a top view of a test device shown according to an exemplary embodiment.
[0022] Figure 4 It is a schematic diagram of the unbent state of a prepreg shown according to an exemplary embodiment.
[0023] Figure 5 It is a schematic diagram of the bent state of a prepreg shown according to an exemplary embodiment. Detailed implementation manners
[0024] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure. It should be noted that, without conflict, the embodiments in the present disclosure and the feature vectors in the embodiments may be arbitrarily combined with each other.
[0025] A prepreg refers to a composition made by impregnating continuous fibers or fabrics with a resin matrix under strictly controlled conditions, and it is an intermediate material for manufacturing composite materials. During the paving process, the bulging condition on the surface of the prepreg is one of the important physical and chemical properties of the prepreg, and it has important significance for the paving and on-machine evaluation of the prepreg.
[0026] In the related art, a method of cutting the prepreg into prepreg sheets of a certain area and counting the number of bulges generated on the surface of the prepreg sheets is often used to evaluate the bulging condition of the prepreg. However, the number of bulges on the surface of the prepreg sheets is easily affected by small bends generated during the transportation and cutting of the prepreg, resulting in its inability to accurately reflect the performance of the prepreg, and there will be a problem that the test situation deviates from the actual situation, thereby leading to a decrease in the product yield and an increase in production losses.
[0027] To solve the above problems, the present disclosure provides a test device for evaluating a prepreg. By bending the prepreg sheet at a large angle, the interference caused by small bends generated during the transportation, cutting, etc. of the prepreg sheet to the test evaluation is eliminated, the accuracy of the prepreg sheet test is improved, it is beneficial to timely adjust the production process according to the actual situation of the prepreg sheet, the production efficiency is improved, and the production losses are reduced.
[0028] According to an exemplary embodiment, as Figures 1-5As shown in the figure, an embodiment of the present disclosure provides a test device for evaluating prepreg. The test device includes a placement table 10, and a first baffle 11, a second baffle 12 and a receiving groove 101 provided on the placement table 10. The placement table 10 can be a supporting base made of materials such as metal, alloy or engineering plastic, such as a stainless steel bottom plate. Its shape can include but is not limited to three-dimensional geometric shapes with planes such as flat plates, cubes, cylinders, and frustums. A receiving groove 101 extending in a first direction is provided on the placement table 10. The receiving groove 101 is used to receive the prepreg sheet 20. The prepreg sheet 20 is obtained by cutting the prepreg to be tested. The receiving groove 101 can be obtained by grooving on the plane of the placement table 10, or can be formed by enclosing other structures on the placement table 10. The embodiment of the present disclosure does not impose too many restrictions on this, and those skilled in the art can set it according to actual needs.
[0029] The first direction is Figures 1-3 the horizontal direction shown in the figure. Along the first direction, a first baffle 11 is provided on one side of the placement table 10. One side edge of the prepreg sheet 20 placed in the receiving groove 101 abuts against the first baffle 11. A second baffle 12 is further provided on the side of the placement table 10 away from the first baffle 11 along the first direction. The second baffle 12 can slide relative to the placement table 10 along the first direction. When the second baffle 12 is in a predetermined position, the second baffle 12 abuts against the side edge of the prepreg sheet 20 away from the first baffle 11. The second baffle 12 and the first baffle 11 jointly clamp the prepreg sheet 20, so that the prepreg sheet 20 is formed from Figure 4 the unbent state shown in the figure into Figure 5 the bent state shown in the figure, and the second baffle 12 remains in the predetermined position for a certain period of time, so that the bent state of the prepreg sheet 20 can be shaped. Since when the prepreg sheet 20 presents a large-angle bent state, it can better eliminate the interference caused by small bends during transportation, cutting, etc., so that the bulging situation of the prepreg sheet 20 can more accurately reflect the actual performance of the prepreg and avoid production losses.
[0030] Among them, the first baffle 11 can be fixedly connected to the placement table 10, or can be detachably connected to the placement table 10 for easy maintenance, replacement and other operations. It can also be integrally formed with the placement table 10 to avoid the accumulation of impurities at the joints and difficult to clean. The embodiment of the present disclosure does not impose too many restrictions on the specific connection method between the first baffle 11 and the placement table 10, and those skilled in the art can choose according to actual needs.
[0031] In the embodiments of the present disclosure, by bending the prepreg sheet at a large angle, the interference caused by small bends generated during the transportation, cutting, etc. of the prepreg sheet to the test evaluation is eliminated, the accuracy of the prepreg sheet test is improved, which is beneficial to timely adjust the production process according to the actual situation of the prepreg sheet, improve the production efficiency, and reduce the production loss.
[0032] In some embodiments, the placement table 10 is further provided with a limiting plate 13. As Figures 1-3 shown, the placement table 10 is provided with two limiting plates 13, and the two limiting plates 13 are arranged at intervals along the second direction. The limiting plate 13 extends along the first direction, and the accommodating groove 101 is formed between the two limiting plates 13. Specifically, the accommodating groove 101 is formed by enclosing the two limiting plates 13 and the placement table 10. Among them, the second direction is perpendicular to the first direction. Taking the orientation shown as an example, the second direction is Figure 3 the vertical direction in Figure 3 and the first direction is Figure 3 the horizontal direction in
[0033] In some embodiments, the limiting plate 13 is provided with scale lines. By setting scale lines on the limiting plate 13, the traveling distance of the second baffle 12 along the first direction can be visually displayed and measured, so as to control the bending degree of the prepreg sheet 20. Among them, the scale lines are provided on at least one of the two limiting plates 13, that is, the scale lines can be set on only one of the limiting plates 13, or can be set on both limiting plates 13. The scale lines can be of international standard length, or other length standards or custom unit lengths after conversion. The scale lines can be printed on the limiting plate 13 by means of laser printing, spraying, etc., or can be set on the limiting plate 13 by means of engraving, etching, etc., or by adjusting the mold when producing the limiting plate 13, so that the scale lines are integrally formed with the limiting plate 13. The embodiments of the present disclosure do not impose too many restrictions on the specific setting form between the limiting plate 13 and the scale lines, and those skilled in the art can choose according to actual needs.
[0034] In some embodiments, the height of the limiting plate 13 is greater than or equal to 0.5 cm. That is, the depth of the accommodating groove 101 is greater than 0.5 cm, so as to play a limiting role on the prepreg sheet 20 along the second direction and prevent the prepreg sheet from sliding out of the accommodating groove 101.
[0035] In some embodiments, the heights of the first baffle 11 and the second baffle 12 are greater than or equal to the height of the limiting plate 13. Since the heights of the first baffle 11 and the second baffle 12 are greater than or equal to the height of the limiting plate 13, the first baffle 11 and the second baffle 12 can play a limiting role on the prepreg sheet 20 along the first direction to jointly clamp the prepreg sheet 20 and cause it to bend.
[0036] In some embodiments, the test device further includes a third baffle (not shown in the figure). The third baffle can be arranged parallel to the bottom surface of the receiving groove 101, one end of the third baffle is connected to the first baffle 11, and there is a certain distance between the third baffle and the receiving groove 101, which is used to ensure that the prepreg sheet 20 can be bent and limit the prepreg sheet 20 in the height direction to avoid excessive bending affecting the test results.
[0037] In some embodiments, the prepreg sheet 20 is rectangular. The direction in which the long side of the rectangle extends is consistent with the first direction, and the length of the limiting plate 13 is greater than or equal to twice the length of the rectangle, so as to facilitate the operation of the second baffle 12 so that it can move along the first direction and drive the prepreg sheet 20 to bend.
[0038] In some embodiments, there is a first distance between the predetermined position and the first baffle 11. The first distance is less than the length of the rectangle, and the first distance is greater than or equal to 4 / 5 of the length of the rectangle, preferably 4 / 5 of the length of the rectangle, so as to ensure that the prepreg sheet 20 has a certain bending angle, and at the same time, the bulges will not be swallowed up due to excessive bending, which affects the accuracy of the test.
[0039] In one example, the prepreg sheet 20 is a square. That is, the prepreg sheet 20 is a special rectangle, the length of the limiting plate 13 is greater than or equal to twice the side length of the square, and the distance between the predetermined position and the first baffle 11 is less than the side length of the square and greater than or equal to 4 / 5 of the side length of the square. Specifically, when the prepreg sheet 20 is a square with a side length of 150 mm, the length of the limiting plate can be set to 300 mm. When the second baffle 12 is at the predetermined position, the prepreg sheet 20 is clamped by the first baffle 11 and the second baffle 12 in a bent state. The distance between the predetermined position and the first baffle 11 is the first distance, and the first distance is preferably 120 mm. That is, from the time when the second baffle 12 just contacts the prepreg sheet 20 to the time when the second baffle 12 reaches the predetermined position, the distance traveled by the second baffle 12 is the second distance, and the second distance is 30 mm.
[0040] In addition, when the prepreg sheet 20 is bent, the two parts of the prepreg sheet 20 are not completely Figure 4 The bend shown in the figure is not a natural bend, but a natural bend. The connection between the two parts has a certain curvature. Figure 4 This is merely an exemplary display for the purpose of facilitating understanding of the degree of bending, wherein the approximate angle between the two bent portions of the prepreg sheet 20 is in the range of 100° to 120°.
[0041] In some embodiments, the second baffle 12 is also connected to the handle 121. Figure 1As shown, the handle 121 is disposed on the side of the second baffle 12 away from the first baffle 11, so as to facilitate the operator to hold the handle 121, push or pull the second baffle 12, so that the second baffle 12 moves along the first direction. Wherein, the handle 121 can be fixedly connected to the second baffle 12, detachably connected or integrally formed on the second baffle 12, and the embodiments of the present disclosure do not make special limitations on this.
[0042] In some embodiments, a release film (not shown in the figure) is disposed on one side of the prepreg sheet 20. As Figure 1 shown, when the prepreg sheet 20 is received in the receiving groove 101, the side provided with the release film contacts the bottom surface of the receiving groove 101 to prevent the bottom surface of the prepreg sheet 20 from adhering to the receiving groove 101. When the first baffle 11 and the second baffle 12 clamp the prepreg sheet 20 into a bent state, the prepreg sheet 20 arches upward. When the second baffle 12 remains at a predetermined position for a certain period of time, the bent state of the prepreg sheet 20 is fixed, and the prepreg sheet 20 can be taken off, and the side provided with the release film is placed upward, and the number of bulges is observed and counted. Wherein, the release film can be a transparent film to facilitate accurately observing the bulging condition of the prepreg sheet 20.
[0043] Next, specific test result examples will be combined to illustrate the beneficial effects of the technical solutions of the embodiments of the present disclosure on prepreg evaluation.
[0044] In the first example, T800 carbon fiber is used to prepare the prepreg, the impregnation temperature is 100 °C, the impregnation pressure is 300 kg, and the prepared prepreg is cut into a square prepreg sheet with a side length of 150 mm. As Figures 1-5 shown, first, the side of the prepreg sheet 20 provided with the release film is placed downward and flat in the receiving groove 101, and one side of the prepreg sheet 20 abuts against the first baffle 11; then the second baffle 12 moves close to the first baffle 11 along the first direction. When the second baffle 12 reaches the predetermined position, it remains at this position for 10 s to fix the bending degree of the prepreg sheet 20. The distance between the predetermined position and the first baffle 11 is the first distance, and the first distance is 120 mm; then the prepreg sheet 20 is taken out, and the side provided with the release film is placed upward, and the number of bulges is observed and counted. Before adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 4, 8, and 21 respectively, and the average value of the number of bulges is 11; after adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 320, 318, and 250 respectively, and the average value of the number of bulges is 296.
[0045] In the second example, T800 carbon fiber is also used for prepreg preparation, and the impregnation pressure is increased to 600 kg, while the other parameters and operating conditions remain unchanged. Before adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 9, 12, and 3 respectively, and the average value of the number of bulges is 8; after adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 245, 264, and 236 respectively, and the average value of the number of bulges is 248.
[0046] In the third example, T800 carbon fiber is also used for prepreg preparation, and the impregnation pressure is increased to 900 kg, while the other parameters and operating conditions remain unchanged. Before adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 12, 5, and 17 respectively, and the average value of the number of bulges is 11; after adopting the technical solution of this example, the single values of the number of bulges counted in three experiments are 120, 151, and 98 respectively, and the average value of the number of bulges is 123.
[0047] As is well known in the art, the bulging situation of prepregs is mainly affected by the impregnation degree. As the impregnation pressure increases, the number of bulges of prepregs should show a downward trend. Comparing the above three examples, it can be seen that before adopting the solution of the embodiments of the present disclosure, as the impregnation pressure increases, the average values of the number of bulges of prepregs are 11, 8, and 11 respectively, showing an irregular distribution, and the results of bulge tests are difficult to accurately characterize the impregnation situation of prepregs; after adopting the solution of the embodiments of the present disclosure, as the impregnation pressure increases, the average values of the number of bulges of prepregs are 296, 248, and 123 respectively, showing a downward trend as the impregnation pressure increases, which conforms to this objective law. Therefore, it can be shown that the solution proposed in the embodiments of the present disclosure can more accurately represent the impregnation performance of prepregs.
[0048] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not exclude the existence of additional identical elements in the process, method, article or device comprising the said elements.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limiting it. The present disclosure has only been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and all of them should be covered within the scope of the claims of the present disclosure.
Claims
1. A test device for evaluating prepregs, characterized in that, Comprising: A storage table is provided with a receiving groove extending in a first direction. The receiving groove is used for receiving a prepreg sheet. Along the first direction, a first baffle is provided on one side of the storage table, and the prepreg sheet abuts against the first baffle. A second baffle is provided on the side of the storage table away from the first baffle. The second baffle can slide along the first direction. When the second baffle is in a predetermined position, the second baffle and the first baffle jointly clamp the prepreg sheet, making the prepreg sheet in a bent state.
2. The test device according to claim 1, characterized in that, The storage table is further provided with two limiting plates arranged at intervals in a second direction. The limiting plates extend along the first direction, and a receiving groove is formed between the two limiting plates, wherein the second direction is perpendicular to the first direction.
3. The testing device according to claim 2, wherein Scale lines are provided on the limiting plates.
4. The test device according to claim 2, wherein, The height of the limiting plates is greater than or equal to 0.5 cm.
5. The testing device according to claim 4, wherein, The heights of the first baffle and the second baffle are greater than or equal to the height of the limiting plates.
6. The test device according to claim 2, characterized in that, The prepreg sheet is rectangular, and the length of the limiting plates is greater than or equal to twice the length of the rectangle.
7. The testing device according to claim 6, wherein A first distance is provided between the predetermined position and the first baffle. The first distance is less than the length of the rectangle and greater than or equal to 4 / 5 of the length of the rectangle.
8. The testing device according to claim 2, wherein The prepreg sheet is a square with a side length of 150 mm, and the length of the limiting plates is 300 mm.
9. The test device according to claim 1, characterized in that The second baffle is connected to a handle, and the handle is provided on the side of the second baffle away from the first baffle.
10. The testing device according to claim 1, wherein A release film is provided on one side of the prepreg sheet. When the prepreg sheet is received in the receiving groove, the side provided with the release film contacts the bottom surface of the receiving groove.