Friction performance testing device for uncured prepreg

Abstract

The utility model relates to a friction performance testing device for uncured prepreg, which comprises a testing clamp and a heating insulation box, the heating insulation box is sleeved outside the testing clamp, the testing clamp comprises a base plate, two supporting plates, at least two sliding rods, a moving plate, a first clamping plate, a second clamping plate, a servo electric cylinder, a pull head and a flexible main pull plate, the two supporting plates are fixed to the two sides of the top face of the base plate. The at least two sliding rods are fixed between the two supporting plates; the movable plate is movably arranged on the sliding rod in a penetrating manner; the first clamping plate is fixed to the inner side face of one supporting plate. The second clamping plate is fixed to the side face of the movable plate. An output shaft of the servo electric cylinder is fixedly connected with the movable plate; the pull head is clamped and fixed through an upper chuck of the universal testing machine; one end of the flexible main pulling plate is located between the first clamping plate and the second clamping plate, and the other end is fixedly connected with the pulling head. According to the utility model, the prepreg can be uniformly heated, the normal pressure is constant, and an ideal environment is provided for experimental tests.

Description

Technical Field

[0001] The utility model belongs to the technical field of prepregs, and particularly relates to a friction performance testing device for uncured prepregs. Background Art

[0002] During the hot molding preforming process, due to the presence of interlayer resin, the interlayer slip behavior of prepregs is significantly different from the common Coulomb friction behavior. The resin between prepreg layers separates adjacent plies, preventing direct contact between fibers and acting as a lubricant. The interlayer slip resistance mainly comes from the internal friction of the resin.

[0003] There are many influencing factors for the slip resistance, which is not only related to the pressure, but also related to the viscosity of the resin and the slip speed. The interlayer slip behavior of prepregs is significantly related to the formation of defects such as wrinkles in the preform. Therefore, it is crucial to test the friction performance of uncured prepregs under different temperatures, different pressures, and different slip speeds.

[0004] Currently, most of the devices for testing the interlayer slip resistance of prepregs are completed by installing special fixtures on a universal testing machine. When applying a normal pressure to the prepreg sheet, most of these devices use springs to provide the pressure, and a pressure sensor is used to monitor the real-time change of the normal pressure received by the prepreg. This method can only ensure the constancy of the actual normal pressure received by the prepreg sheet before the entire device runs. However, during the actual operation of the device, the reading of the pressure sensor, that is, the actual normal pressure received by the prepreg, will change with the operation of the device, resulting in a large experimental error. Moreover, these devices all use heating sheets or heating plates to heat the prepreg sheet, and this heating method will cause uneven heating of the prepreg sheet. The prepreg sheet exposed to the air will also cause uneven heating, affecting the resin flow in the prepreg and thus resulting in a large experimental error. Summary of the Utility Model

[0005] The main object of the utility model is to propose a friction performance testing device for uncured prepregs, which can effectively solve the problems in the background art.

[0006] To achieve the above object, the utility model is realized through the following technical solutions:

[0007] A friction performance testing device for uncured prepregs is provided on a universal testing machine, including a testing fixture and a heating and insulation box. The heating and insulation box is sleeved outside the testing fixture, and the testing fixture includes

[0008] a substrate, which is clamped and fixed by the lower chuck of the universal testing machine;

[0009] two support plates, which are fixed on both sides of the top surface of the substrate;

[0010] At least two sliding rods, fixed between the two support plates;

[0011] A moving plate, movably disposed on the sliding rods;

[0012] A first clamping plate, fixed to the inner side of one of the support plates;

[0013] A second clamping plate, fixed to the side of the moving plate, the first clamping plate and the second clamping plate being disposed opposite to each other;

[0014] A servo electric cylinder, the output shaft of which is fixedly connected to the moving plate;

[0015] A pull head, clamped and fixed by the upper chuck of a universal testing machine;

[0016] A flexible main pulling plate, one end being located between the first clamping plate and the second clamping plate, and the other end being fixedly connected to the pull head.

[0017] Preferably, it further includes

[0018] Two thermocouples, respectively fixed to the first clamping plate and the second clamping plate;

[0019] A temperature control box, electrically connected to the heating and heat preservation box and the two thermocouples respectively.

[0020] Preferably, it further includes

[0021] A pressure sensor, disposed between the output shaft of the servo electric cylinder and the moving plate;

[0022] An electric cylinder controller, electrically connected to the servo electric cylinder and the pressure sensor respectively.

[0023] Preferably, both sides of the first clamping plate and the second clamping plate are connected with first fastening plates by bolts.

[0024] Preferably, both sides of the flexible main pulling plate are connected with second fastening plates by bolts.

[0025] Preferably, the heating and heat preservation box is formed by splicing an upper box body and a lower box body, and splicing notch openings are provided on the upper box body and the lower box body corresponding to the upper chuck and the lower chuck of the universal testing machine.

[0026] The present invention provides a friction performance testing device for uncured prepreg, having the following beneficial effects:

[0027] The present invention can ensure uniform heating of the prepreg by heating the prepreg through a heating and heat preservation box sleeved outside the test fixture, and can ensure the constancy of the normal pressure by applying a normal pressure to the prepreg through a servo electric cylinder, providing an ideal environment for experimental testing and reducing experimental errors. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the test device of the present utility model;

[0029] Figure 2 It is a front view of the test fixture of the present utility model;

[0030] Figure 3 It is a side view of the test fixture of the present utility model.

[0031] In the figure: 1. Test fixture; 11. Substrate; 12. Support plate; 13. Slide bar; 14. Moving plate; 15. First clamping plate; 16. Second clamping plate; 17. Servo electric cylinder; 18. Pull head; 19. Flexible main pull plate; 2. Heating and insulation box; 3. Thermocouple; 4. Temperature control box; 5. Pressure sensor; 6. Electric cylinder controller; 7. First fastening plate; 8. Second fastening plate; 100. Lower chuck; 200. Upper chuck. Detailed Embodiment

[0032] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model.

[0033] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Embodiment

[0037] Referring to Figures 1 - 3 As shown, a friction performance testing device for uncured prepreg is arranged on a universal testing machine and includes a test fixture 1 and a heating and insulation box 2, and the heating and insulation box 2 is sleeved outside the test fixture 1.

[0038] The test fixture 1 includes a base plate 11, two support plates 12, at least two slide bars 13, a moving plate 14, a first clamping plate 15, a second clamping plate 16, a servo electric cylinder 17, a pull head 18 and a flexible main pull plate 19.

[0039] The base plate 11 is clamped and fixed by the lower chuck 100 of the universal testing machine; the two support plates 12 are fixed on both sides of the top surface of the base plate 11; at least two slide bars 13 are fixed between the two support plates 12; the moving plate 14 is movably inserted on the slide bars 13; the first clamping plate 15 is fixed on the inner side of one of the support plates 12; the second clamping plate 16 is fixed on the side surface of the moving plate 14, and the first clamping plate 15 and the second clamping plate 16 are arranged oppositely; the output shaft of the servo electric cylinder 17 is fixedly connected with the moving plate 14; the pull head 18 is clamped and fixed by the upper chuck 200 of the universal testing machine; one end of the flexible main pull plate 19 is located between the first clamping plate 15 and the second clamping plate 16, and the other end is fixedly connected with the pull head 18.

[0040] Before the test, prepare three pieces of uncured prepreg, namely prepreg a, prepreg b and prepreg c. In this embodiment, the sizes of prepreg a and prepreg b are 100*190 mm respectively, and the size of prepreg c is 120*460 mm, and the thickness is all right, and pretreatment is carried out in advance.

[0041] Test preparation: two pieces of prepreg a and prepreg b with a size of 100*190mm are laid and fixed on the first clamping plate 15 and the second clamping plate 16 respectively, and the prepreg c with a size of 120*460mm is bent and laid and fixed on the two sides of the flexible main pulling plate 19, and then a heating insulation box 2 is put on the outer cover of the test fixture 1, and the three prepregs inside it are heated by the heating insulation box 2. They are heated and left to stand for 10-15 minutes at the required heating temperature to ensure that the prepregs are heated evenly. After heating and insulation are completed, the servo electric cylinder 17 is started. The output shaft of the servo electric cylinder 17 pushes the movable plate 14 to move, so that the second clamping plate 16 is close to the first clamping plate 15, and the three prepregs are attached to each other. A constant normal pressure is applied to the prepregs by the servo electric cylinder 17.

[0042] Start the test and test the friction performance through the universal testing machine. After setting the required experimental parameters on the computer, click to start the experiment. The lower chuck 100 is fixed, and the upper chuck 200 pulls the flexible main pull plate 19 through the pull head 18 to move. It automatically stops after reaching the set time or position. At the same time, the sensor of the universal testing machine will transmit the target frame to the computer to obtain the friction performance parameters.

[0043] The utility model heats the prepreg by arranging a heating and heat preservation box 2 outside the test fixture 1, so as to ensure that the prepreg is heated evenly. The servo electric cylinder 17 applies normal pressure to the prepreg, so as to ensure that the normal pressure is constant, provide an ideal environment for experimental testing, and reduce experimental errors.

[0044] In a specific embodiment, it also includes two thermocouples 3 and a temperature control box 4; the two thermocouples 3 are respectively fixed on the first clamping plate 15 and the second clamping plate 16; the temperature control box 4 is electrically connected to the heating and insulation box 2 and the two thermocouples 3.

[0045] The thermocouple 3 monitors the temperature of the first clamping plate 15 and the second clamping plate 16 in real time, that is, the temperature of the prepreg, and transmits the temperature signal to the temperature control box 4, through which the temperature of the heating and insulation box 2 and the prepreg is accurately controlled.

[0046] In a specific embodiment, it also includes a pressure sensor 5 and an electric cylinder controller 6; the pressure sensor 5 is arranged between the output shaft of the servo electric cylinder 17 and the moving plate 14; the electric cylinder controller 6 is electrically connected to the servo electric cylinder 17 and the pressure sensor 5 respectively.

[0047] The pressure sensor 5 monitors the pressure between the output shaft of the servo electric cylinder 17 and the movable plate 14, that is, the normal pressure on the prepreg, in real time, and transmits the pressure signal to the electric cylinder controller 6, through which the normal pressure on the prepreg is accurately controlled.

[0048] In a specific embodiment, first fastening plates 7 are connected to both sides of the first clamping plate 15 and the second clamping plate 16 by bolts. After the bolts are turned, prepreg with a size of 100*190 mm can be clamped and fixed on the first clamping plate 15 or the second clamping plate 16 through the first fastening plates 7.

[0049] In a specific embodiment, second fastening plates 8 are connected to both sides of the flexible main tension plate 19 by bolts. After the bolts are turned, both ends of prepreg with a size of 120*460 mm can be clamped and fixed on both side surfaces of the flexible main tension plate 19 through the second fastening plates 8.

[0050] In a specific embodiment, the heating and heat preservation box 2 is formed by splicing an upper box body and a lower box body. Splicing notches are provided on the upper box body and the lower box body corresponding to the upper chuck 200 and the lower chuck 100 of the universal testing machine.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A friction performance testing device for uncured prepreg, arranged on a universal testing machine, characterized in that: It includes a test fixture and a heating and heat preservation box, wherein the heating and heat preservation box is sleeved outside the test fixture, wherein the test fixture includes a base plate, which is clamped and fixed by a lower clamp of a universal testing machine; Two support plates, fixed on both sides of the top surface of the base plate; At least two slide bars are fixed between the two support plates; A movable plate, movably arranged on the sliding rod; A first clamping plate, fixed to an inner side surface of one of the support plates; A second clamping plate is fixed to the side of the movable plate, the first clamping plate and the second clamping plate are arranged opposite to each other; A servo electric cylinder, the output shaft of which is fixedly connected to the moving plate; The pull head is clamped and fixed by the upper clamp of the universal testing machine; A flexible main pull plate has one end located between the first clamping plate and the second clamping plate, and the other end fixedly connected to the pull head.

2. A friction performance testing device for uncured prepreg according to claim 1, characterized in that: Also includes Two thermocouples, fixed on the first clamping plate and the second clamping plate respectively; The temperature control box is electrically connected to the heating and insulation box and the two thermocouples respectively.

3. A friction performance testing device for uncured prepreg according to claim 1, characterized in that: Also includes A pressure sensor is provided between the output shaft of the servo electric cylinder and the moving plate; The electric cylinder controller is electrically connected to the servo electric cylinder and the pressure sensor respectively.

4. A friction performance testing device for uncured prepreg according to claim 1, characterized in that: Both sides of the first clamping plate and the second clamping plate are connected with a first fastening plate by bolts.

5. The friction performance testing device for uncured prepreg according to claim 1, characterized in that: Both sides of the flexible main pull plate are connected with second fastening plates through bolts.

6. A friction performance testing device for uncured prepreg according to claim 1, characterized in that: The heating and heat preservation box is formed by splicing an upper box body and a lower box body, and splicing notches are arranged on the upper box body and the lower box body corresponding to the upper chuck and the lower chuck of the universal testing machine.

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