Die for carbon fiber interlayer shearing sample

Abstract

The utility model discloses a mold for shearing a sample between carbon fiber layers, which relates to the field of carbon fiber detection devices and comprises a main body and an upper pressing body, a sample groove is formed in the top surface of the main body, is horizontal and penetrates through the main body; the bottom of the upper pressing body is inserted into the sample groove and attached to the two side walls of the sample groove, and the bottom face of the bottom of the upper pressing body does not make contact with the bottom face of the sample groove. The main body is also provided with an overflow structure which is communicated with the sample groove. According to the utility model, the overflow structure used for discharging redundant resin is arranged, so that the phenomena of wire stringing, wire running, wire stacking and the like in the pressing process of the carbon fiber layer shear sample strip are avoided, and the finished product quality of the carbon fiber layer shear sample strip is improved. Besides, the sample groove for bearing the carbon fiber sample is of an integral structure, so that the problem of local stress concentration of a splicing structure is not easy to occur, and the bearing capacity and the structural stability of the sample groove are better.

Description

Technical Field

[0001] The utility model relates to the field of carbon fiber detection devices, in particular to a mold for shearing carbon fiber interlayer samples. Background Art

[0002] Carbon fiber is a high-performance fiber material widely used in aerospace, energy equipment, and other fields. The interlaminar shear strength (ILSS) of carbon fiber is a key indicator for evaluating the bond strength between layers of carbon fiber composites. ILSS testing of carbon fiber is crucial for controlling the production process of high-performance fibers.

[0003] Chinese patent CN214173914U discloses a simple carbon fiber layer shearing strip preparation device, which includes a rear pressing plate, which is a rectangular flat plate with a convex body at the lower end of the plate and another convex body at a certain distance from the lower end of the plate. The two convex bodies and the rectangular flat plate are integrated into the rear pressing plate; the front pressing plate is a rectangular flat plate with a convex body at the lower end of the plate at a certain distance from the bottom of the plate; the upper pressing plate is a rectangular flat plate with a convex body at the center line of the plate; the convex body of the front pressing plate is just embedded between the two convex bodies of the rear pressing plate and fixes the rear pressing plate and the front pressing plate together; the convex body of the upper pressing plate can be embedded in the tooling formed by the front pressing plate and the rear pressing plate.

[0004] When conducting ILSS testing, resin needs to be coated on the carbon fiber sample to form a composite material. When too much resin is coated on the carbon fiber sample, the excess resin has no release channel and is difficult to be discharged from the groove, resulting in the occurrence of wire stringing, wire running, wire piling and other phenomena during the pressing process of the carbon fiber layer shear strips, affecting the quality of the finished product of the carbon fiber layer shear strips.

[0005] In addition, in the above-mentioned device, the groove used to support the carbon fiber sample is composed of a front pressure plate and a rear pressure plate. When the upper pressure plate applies pressure to the carbon fiber sample in the groove, the connection between the front pressure plate and the rear pressure plate may be affected, resulting in local stress concentration, affecting the bearing capacity and structural stability of the groove. Utility Model Content

[0006] Aiming at the problem that in the existing carbon fiber layer shearing specimen preparation device, excess resin is difficult to discharge from the groove, affecting the quality of the finished carbon fiber layer shearing specimen, and the groove for carrying the carbon fiber sample is a spliced ​​structure, and the pressure at the splicing point is likely to cause local stress concentration, affecting the bearing capacity and structural stability of the groove, the utility model provides a mold for carbon fiber interlayer shearing samples, which includes a main body and an upper pressure body;

[0007] A sample groove is provided on the top surface of the main body, the sample groove is horizontal and both ends of the sample groove pass through the main body;

[0008] The upper pressing body bottom is inserted into the sample groove and is attached to the two side walls of the sample groove, and the bottom surface of the upper pressing body bottom is not in contact with the bottom surface of the sample groove;

[0009] The main body is further provided with an overflow structure, which is in communication with the sample groove.

[0010] The overflow structure is an overflow groove, which is arranged on at least one side wall of the sample groove. When the bottom surface of the upper pressing body bottom is at the lowest position in the sample groove, the bottom surface of the upper pressing body bottom is lower than the bottom edge of the overflow groove.

[0011] The overflow groove is parallel to the sample groove and penetrates through the main body at both ends.

[0012] The cross section of the overflow groove is semicircular.

[0013] The two linear long edges of the overflow groove are chamfered.

[0014] The two top edges of the sample groove are chamfered.

[0015] The utility model further sets up: still include screw rod, the upper pressing body includes top plate and convex strip, and the convex strip is fixed at the bottom surface of top plate, when the bottom surface of top plate is attached to the top surface of main body, the convex strip is inserted into the sample groove and is attached to the two side walls of sample groove, one group of screw rods is arranged on both sides of the sample groove, and at least two screw rods are arranged in each group. The top surface of the main body is further provided with a screw rod groove, and the top plate is provided with a threaded hole. When the top plate moves upward along the screw rod, the bottom surface of the top plate is separated from the top surface of the main body.

[0016] When the screw rod is located in the screw rod groove, the screw rod is not in contact with the side wall of the screw rod groove.

[0017] Each screw rod groove penetrates through the main body in a direction away from the sample groove.

[0018] The bottom surface of the screw rod is a spherical surface, and the bottom surface of the screw rod groove is a semicircular surface. The axis of the semicircular surface is perpendicular to the length direction of the sample groove and intersects with the axis of the threaded hole above.

[0019] The top end of each screw rod is fixed with a convex block for matching a wrench.

[0020] The utility model further sets up: still include first handle and second handle, first handle is fixed on the main part, second handle is fixed on the upper pressure body.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model sets up the overflow structure for discharging the excess resin, avoids the phenomenon of silk stringing, silk running and silk piling during the pressing process of the carbon fiber layer shear sample strip, improves the finished product quality of the carbon fiber layer shear sample strip. Meanwhile, the sample groove for bearing the carbon fiber sample in the utility model is a whole structure, and the local stress concentration problem caused by the splicing structure is not easy to occur, and the bearing capacity and structural stability of the sample groove are better. In addition, the utility model also sets up the screw rod matched with the upper pressure body and the main part, and the separation of the upper pressure body and the main part can be accelerated by rotating the screw rod, and the demolding speed of the carbon fiber layer shear sample strip is improved.

[0023] The specific embodiments of the utility model will be described in further detail below with reference to the drawings. DRAWINGS

[0024] The drawings are part of the utility model, which is used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, but do not constitute improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0025] Figure 1 It is the whole structure schematic diagram of the utility model;

[0026] Figure 2 It is the side view of the utility model;

[0027] Figure 3 It is the schematic diagram of the upper pressure body in the utility model;

[0028] Figure 4 It is the schematic diagram of the main part in the utility model;

[0029] Figure 5 It is the front view of the main part in the utility model;

[0030] Figure 6 It is Figure 5 The enlarged schematic diagram of area A in it;

[0031] Figure 7 It is Figure 6 The enlarged schematic diagram of area B in it.

[0032] In the figure: 1. Main body; 11. Sample slot; 12. Screw rod slot; 13. Overflow slot; 14. Chamfered angle structure; 15. Rounded angle structure; 2. Upper pressure body; 21. Top plate; 211. Threaded hole; 22. Raised strip; 3. Screw rod; 4. First handle; 5. Second handle; 6. Bump.

[0033] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0037] Example

[0038] like Figures 1-7 As shown, it is a preferred embodiment of the present invention. This embodiment provides a mold for carbon fiber interlayer shearing samples, which includes a main body 1 and an upper pressing body 2.

[0039] A sample groove 11 is formed on the top surface of the main body 1 . The sample groove 11 is horizontal and has two ends passing through the main body 1 .

[0040] The bottom of the upper pressing body 2 is inserted into the sample tank 11 and abuts against the two side walls of the sample tank 11 , and the bottom surface of the bottom of the upper pressing body 2 and the bottom surface of the sample tank 11 do not contact each other.

[0041] The main body 1 is further provided with an overflow structure which communicates with the sample groove 11.

[0042] The overflow structure is arranged for discharging excess resin, avoiding the phenomena of stringing, running and piling of carbon fiber during the pressing of the carbon fiber layer shear sample, and improving the finished product quality of the carbon fiber layer shear sample. Meanwhile, the sample groove 11 for bearing the carbon fiber sample is of an integral structure, and is not prone to local stress concentration caused by a spliced structure. The bearing capacity and structural stability of the sample groove 11 are better.

[0043] Specifically, the overflow structure is an overflow groove 13 which is arranged on at least one side wall of the sample groove 11 and is easy to process. When the bottom surface of the bottom of the upper pressing body 2 is at the lowest position in the sample groove 11, the bottom surface of the bottom of the upper pressing body 2 is lower than the bottom edge of the overflow groove 13, so as to avoid the interference of the overflow groove 13 to the forming of the carbon fiber layer shear sample.

[0044] Specifically, the overflow groove 13 is parallel to the sample groove 11 and penetrates through the main body 1 at both ends, which is easy to process and beneficial to the outflow of the resin.

[0045] Specifically, the cross section of the overflow groove 13 is semicircular, and the overflow groove 13 does not have corner structures which are prone to residual resin, and is helpful to completely remove the residual resin in the overflow groove 13.

[0046] Specifically, the two linear long edges of the overflow groove 13 are chamfered structures 15, so as to avoid the abrasion of the two linear long edges of the overflow groove 13 to the upper pressing body 2, and reduce the influence of the two linear long edges of the overflow groove 13 to the fitting precision between the upper pressing body 2 and the sample groove 11. Meanwhile, the chamfered structures of the overflow groove 13 are also helpful to guide the resin to flow into the overflow groove 13.

[0047] Specifically, both side walls of the sample groove 11 are provided with the overflow groove 13 in the embodiment.

[0048] Specifically, the two top edges of the sample groove 11 are inverted bevel structures 14, so as to avoid the abrasion of the two top edges of the sample groove 11 to the upper pressing body 2, and reduce the influence of the two top edges of the sample groove 11 to the fitting precision between the upper pressing body 2 and the sample groove 11. Meanwhile, the inverted bevel structures of the sample groove 11 are also helpful to guide the upper pressing body 2 to enter the sample groove 11.

[0049] Specifically, the upper pressing body 2 comprises a top plate 21 and a convex strip 22 which is fixed to the bottom surface of the top plate 21. When the bottom surface of the top plate 21 is attached to the top surface of the main body 1, the convex strip 22 is inserted into the sample groove 11 and attached to the two side walls of the sample groove 11, and the bottom surface of the convex strip 22 does not contact the bottom surface of the sample groove 11.

[0050] The top plate 21 and the convex strip 22 are integrally formed in the embodiment.

[0051] The embodiment also comprises a plurality of lead screws 3, each group of which is arranged on both sides of the sample groove 11 and comprises at least two lead screws 3. The top surface of the main body 1 is further provided with a plurality of lead screw grooves 12, and the top plate 21 is provided with a plurality of threaded holes 211. Each lead screw 3 corresponds to a lead screw groove 12 and a threaded hole 211. After the threaded hole 211 is screwed with the lead screw 3, the bottom surface of the lead screw groove 12 is in contact with the lead screw 3. When the top plate 21 moves upward along the lead screw 3, the bottom surface of the top plate 21 is separated from the top surface of the main body 1, which helps to accelerate the separation of the upper pressing body 2 and the main body 1 and improve the demolding speed of the carbon fiber layer shear sample strip.

[0052] It should be noted that the higher the cooperation accuracy between the main body 1 and the upper pressing body 2, the better the quality of the carbon fiber layer shear sample strip.

[0053] Specifically, all the lead screws 3 in the same group are arranged along the length direction of the sample groove 11, and the two groups of lead screws 3 are symmetrically distributed. In the embodiment, two lead screws 3 are arranged in each group, and a total of four lead screws 3 are arranged.

[0054] The embodiment also comprises a first handle 4 and a second handle 5. The first handle 4 is fixed to the main body 1, and the second handle 5 is fixed to the upper pressing body 2. The user of the mold can apply a mutual separating force to the main body 1 and the upper pressing body 2 through the first handle 4 and the second handle 5 to accelerate the separation of the main body 1 and the upper pressing body 2, so as to quickly take out the finished product of the carbon fiber layer shear sample strip in the sample groove 11.

[0055] In the embodiment, one first handle 4 is fixed to each side of the main body 1, and one second handle 5 is fixed to each side of the top plate 21. The two first handles 4 are respectively located on both sides of the sample groove 11, and the two second handles 5 are respectively located on both sides of the convex strip 22.

[0056] Specifically, when the lead screw 3 is located in the lead screw groove 12, the lead screw 3 and the sidewall of the lead screw groove 12 are not in contact with each other, so as to reduce the interference of the wall of the lead screw groove 12 with the rotation of the lead screw 3. At the same time, the slot of the lead screw groove 12 is larger than the outer diameter of the lead screw 3, which also helps to reduce the difficulty of aligning the lead screw 3 with the lead screw groove 12.

[0057] Specifically, each lead screw groove 12 penetrates the main body 1 in a direction away from the sample groove 11, so as to facilitate the observation and adjustment of the position of the lead screw 3 in the lead screw groove 12, and make the lead screw 3 vertically supported on the bottom surface of the lead screw groove 12.

[0058] Specifically, the bottom surface of the lead screw 3 is a spherical surface, and the bottom surface of the lead screw groove 12 is a semicircular arc surface. The axis of the semicircular arc surface is perpendicular to the length direction of the sample groove 11 and intersects with the axis of the threaded hole 211 above. The cooperation of the semicircular arc surface and the spherical surface helps to quickly complete the positioning of the bottom end of the lead screw 3.

[0059] Specifically, a protrusion 6 for matching a wrench is fixed to the top of each screw rod 3 to facilitate the rotation of the screw rod 3. The protrusion 6 is any one of a polygonal prism and a polygonal flower-shaped column. In this embodiment, the protrusion 6 is a quadrangular prism.

[0060] Specifically, the protrusion 6 and the screw rod 3 are formed integrally.

[0061] Specifically, in this embodiment, the main body 1 and the upper pressure body 2 are both quenched parts, and both have high deformation resistance and load-bearing capacity.

[0062] When this mold is used, first place the carbon fiber sample coated with resin in the sample slot 11, then insert the convex strip 22 into the sample slot 11, and apply pressure to the carbon fiber sample in the sample slot 11 through the upper pressing body 2 until the bottom surface of the top plate 21 and the top surface of the main body 1 fit together to press out the carbon fiber layer shear strips. During the pressing process, excess resin flows out of the sample slot 11 from the overflow groove 13. After the carbon fiber layer shear strips are pressed, all the screw rods 3 are rotated at the same time to drive the upper pressing body 2 to move upward, so that the bottom surface of the top plate 21 is separated from the top surface of the main body 1. Finally, the main body 1 and the upper pressing body 2 are applied with a force to separate each other through the first handle 4 and the second handle 5, so that the main body 1 and the upper pressing body 2 are completely separated to remove the carbon fiber layer shear strips in the sample slot 11.

[0063] In summary, the present embodiment is provided with an overflow structure for discharging excess resin, thereby avoiding the occurrence of wire stringing, wire running, and wire piling during the pressing process of the carbon fiber layer shear strips, thereby improving the quality of the finished product of the carbon fiber layer shear strips. At the same time, the sample tank 11 used to carry the carbon fiber sample in the present embodiment is an integral structure, which is not prone to the problem of local stress concentration that is prone to occur in splicing structures. The sample tank 11 has better load-bearing capacity and structural stability. In addition, the present embodiment is also provided with a screw rod 3 that cooperates with the upper pressure body 2 and the main body 1. By rotating the screw rod 3, the separation of the upper pressure body 2 and the main body 1 can be accelerated, thereby improving the demolding speed of the carbon fiber layer shear strips.

[0064] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A mold for carbon fiber interlaminar shear samples, characterized by: It comprises a main body (1) and an upper pressing body (2); A sample groove (11) is provided on the top surface of the main body (1), and the sample groove (11) is horizontal and passes through the main body (1) at both ends; The bottom of the upper pressing body (2) is inserted into the sample tank (11) and abuts against the two side walls of the sample tank (11), and the bottom surface of the bottom of the upper pressing body (2) and the bottom surface of the sample tank (11) do not contact each other; The main body (1) is further provided with an overflow structure, and the overflow structure is communicated with the sample tank (11).

2. The mold for carbon fiber interlaminar shearing sample according to claim 1, characterized in that: The overflow structure is an overflow trough (13), which is arranged on at least one side wall of the sample tank (11); when the bottom surface of the bottom of the upper pressure body (2) is at the lowest position in the sample tank (11), the bottom surface of the bottom of the upper pressure body (2) is lower than the bottom edge of the overflow trough (13).

3. The mold for carbon fiber interlaminar shearing sample according to claim 2, characterized in that: The overflow groove (13) is parallel to the sample groove (11) and has both ends passing through the main body (1).

4. The mold for carbon fiber interlaminar shearing samples according to claim 3, characterized in that: The cross section of the overflow trough (13) is semicircular.

5. The mold for carbon fiber interlaminar shearing samples according to claim 3, characterized in that: The two linear long sides of the overflow trough (13) are chamfered structures (15); and the two top sides of the sample trough (11) are chamfered structures (14).

6. A mold for carbon fiber interlaminar shearing samples according to any one of claims 1 to 5, characterized in that: Also includes a screw rod (3); The upper pressing body (2) includes a top plate (21) and a convex strip (22), wherein the convex strip (22) is fixed to the bottom surface of the top plate (21); when the bottom surface of the top plate (21) is in contact with the top surface of the main body (1), the convex strip (22) is inserted into the sample groove (11) and is in contact with the two side walls of the sample groove (11); A group of screw rods (3) is provided on each side of the sample slot (11), with at least two screw rods (3) in each group; a screw rod groove (12) is also provided on the top surface of the main body (1); a threaded hole (211) is provided on the top plate (21); each screw rod (3) corresponds to a screw rod groove (12) and a threaded hole (211); each screw rod (3) is threadedly engaged with its corresponding threaded hole (211) and then abuts against the bottom surface of its corresponding screw rod groove (12); when the top plate (21) moves upward along the screw rod (3), the bottom surface of the top plate (21) is separated from the top surface of the main body (1).

7. The mold for carbon fiber interlaminar shearing samples according to claim 6, characterized in that: When the screw rod (3) is located in the screw rod groove (12), the screw rod (3) and the side wall of the screw rod groove (12) do not contact each other.

8. The mold for carbon fiber interlaminar shearing samples according to claim 7, characterized in that: Each screw rod groove (12) passes through the main body (1) in a direction away from the sample groove (11); the bottom surface of the screw rod (3) is a spherical surface, and the bottom surface of the screw rod groove (12) is a semicircular arc surface; the axis of the semicircular arc surface is perpendicular to the length direction of the sample groove (11) and intersects with the axis of the threaded hole (211) above it.

9. The mold for carbon fiber interlaminar shearing samples according to claim 6, characterized in that: A protrusion (6) for matching a wrench is fixed on the top end of each screw rod (3).

10. A mold for carbon fiber interlaminar shearing samples according to any one of claims 1 to 5, characterized in that: It also includes a first handle (4) and a second handle (5), wherein the first handle (4) is fixed on the main body (1), and the second handle (5) is fixed on the upper pressing body (2).

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