Carbon fiber multifilament drawing sample preparation tool and method

Abstract

The present invention discloses a carbon fiber multifilament stretching sample preparation tool and method in the field of carbon fiber sample preparation technology. The carbon fiber multifilament stretching sample preparation tool comprises: a fixed plate assembly for winding carbon fiber multifilaments; a tension adjustment assembly connected to the fixed plate assembly, for driving the fixed plate assembly, thereby applying tension to a plurality of carbon fiber multifilaments wound on the fixed plate assembly. The present invention drives the fixed plate assembly through the tension adjustment assembly, thereby applying tension to the carbon fiber multifilaments wound on the fixed plate assembly, so that the carbon fiber multifilaments wound on the tool are evenly stressed, reducing dependence on the operator's experience; and at the same time, it has the characteristics of simple structure, easy operation, and low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber sample preparation, and particularly relates to a carbon fiber multifilament stretching sample preparation tool and method. Background Art

[0002] Currently, there are a variety of methods for preparing carbon fiber multifilament samples on the market, most of which are still purely manual. The purely manual method involves manually winding the carbon fiber multifilament on a winding rack before dipping and curing it. This method has several drawbacks: 1. Uneven sample preparation tension. Multifilament sample preparation tension significantly affects tensile test performance. Manual winding relies entirely on operator experience to control tension. Manual winding cannot guarantee consistent tension for each carbon fiber multifilament, and there are significant differences between operators. This impact leads to large intra-group dispersion and large differences in test performance between groups. 2. The dipping process is difficult to control. Due to the operating environment limitations of manual winding, multifilament can only be wound on a rack before dipping. This dipping process carries the risk of multifilament loosening and friction from the glue box, leading to fluctuations in test data. 3. The method is highly dependent on operator experience. Purely manual sample preparation relies entirely on operator experience and lacks standardized control. The normal flow of operators and personal emotions can affect the sample preparation process, which is ultimately reflected in the test results. In addition, although there are multifilament sample preparation machines on the market that can solve the above problems, they are expensive and require high operating requirements. Therefore, a sample making tool is designed to overcome the shortcomings of uneven tension and personnel differences in pure manual winding, and the manufacturing cost is low. Summary of the Invention

[0003] In order to address the deficiencies in the prior art, the present invention provides a carbon fiber multifilament stretching sample preparation tool and method. The carbon fiber multifilament wound on the tool is evenly stressed, reducing dependence on the operator's experience. At the same time, it has a simple structure, easy operation and low manufacturing cost.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a carbon fiber multifilament stretching sample making tool, comprising: a fixed plate assembly for winding carbon fiber multifilaments; a tension adjustment assembly connected to the fixed plate assembly, used to drive the fixed plate assembly, thereby applying tension to a plurality of carbon fiber multifilaments wound on the fixed plate assembly.

[0005] Furthermore, the fixing plate assembly includes a fixing plate and a plurality of columns mounted on the fixing plate, and each of the columns is provided with at least one guide groove.

[0006] Furthermore, the column and the fixing plate are connected by bolts.

[0007] Furthermore, the fixing plate is an angle steel.

[0008] Furthermore, the tension adjustment assembly includes a guide rod, a positioning nut and an adjusting nut respectively threadedly connected to the guide rod; the guide rod is slidingly connected to the fixing plate, and the fixing plate is located between the positioning nut and the adjusting nut.

[0009] Furthermore, the fixing plate is provided with: a first through hole for the guide rod to pass through; a second through hole for the guide rod, the positioning nut and the adjusting nut to pass through; and a guide groove for the guide rod to move between the first through hole and the second through hole.

[0010] In a second aspect, a carbon fiber multifilament stretching and sampling method is provided, which adopts the carbon fiber multifilament stretching and sampling tooling described in the first aspect, including: winding the carbon fiber multifilament on a fixed plate assembly; adjusting the tension adjustment assembly to relax the carbon fiber multifilament wound on the fixed plate assembly and soak it in glue; after soaking for a specified time, adjusting the tension adjustment assembly to apply a required tension to the carbon fiber multifilament wound on the fixed plate assembly, and drying the carbon fiber multifilament with glue.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The present invention drives the fixed plate assembly through the tension adjustment assembly, thereby applying tension to the carbon fiber multifilaments wound on the fixed plate assembly, so that the carbon fiber multifilaments wound on the tooling are evenly stressed, reducing dependence on the operator's experience;

[0013] (2) The present invention has a simple structure, is easy to operate, and has low manufacturing cost;

[0014] (3) The use of the tooling of the present invention can change the dipping order of carbon fiber multifilament sample preparation, adopting dipping first and then stretching, the dipping process is controllable, there is no risk of loosening of the carbon fiber multifilament, and at the same time, the tooling part wound with the carbon fiber multifilament is not contaminated by the glue, avoiding a large amount of cleaning process;

[0015] (4) During the drying process of the carbon fiber multifilament after being dipped in glue, the tooling of the present invention does not need to be moved, and the glue drips into the glue tray, thus avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a carbon fiber multifilament drawing sample preparation tool provided by an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the planar structure of a carbon fiber multifilament drawing sample preparation tool provided by an embodiment of the present invention after being wound with carbon fiber multifilament;

[0018] Figure 3This is a schematic diagram of the state of carbon fiber multifilaments being dipped in glue using a carbon fiber multifilament drawing sample preparation tool provided by an embodiment of the present invention. Figure 1 ;

[0019] Figure 4 This is a schematic diagram of the state of carbon fiber multifilaments being dipped in glue using a carbon fiber multifilament drawing sample preparation tool provided by an embodiment of the present invention. Figure 2 ;

[0020] Figure 5 This is a schematic diagram of a state in which a carbon fiber multifilament stretching and sampling tool provided by an embodiment of the present invention is used to stretch and dry the carbon fiber multifilament after being dipped in resin;

[0021] In the figure: 11, fixing plate; 12, column; 121, guide groove; 13, second through hole; 14, guide groove; 21, guide rod; 22, positioning nut; 23, adjusting nut; 3, carbon fiber multifilament; 4, dipping disc. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] Example 1:

[0024] like Figure 1 、 Figure 2 As shown, a carbon fiber multifilament stretching sample making tool includes a fixed plate assembly for winding carbon fiber multifilaments; a tension adjustment assembly connected to the fixed plate assembly, used to drive the fixed plate assembly to apply tension to a plurality of carbon fiber multifilaments wound on the fixed plate assembly.

[0025] The fixed plate assembly includes a fixed plate 11 and several columns 12 mounted on the fixed plate 11. Each column 12 is provided with at least one guide slot 121. In this embodiment, each column 12 is provided with three guide slots 121. The columns 12 are used to maximize the production of carbon fiber multifilaments and improve production efficiency when the winding frame (carbon fiber multifilament drawing and sampling tool) has sufficient rigidity. The guide slots 121 are used to secure the carbon fiber multifilaments and prevent them from falling off. In other embodiments, the number of guide slots 121 provided on a column 12 can be set as needed.

[0026] This embodiment includes two identical fixing plate assemblies. The fixing plate 11 is made of angle steel, and the columns 12 are bolted to one side of the angle steel for easy disassembly and cleaning. The number and spacing of the columns 12 are determined by process requirements. The use of angle steel facilitates the placement and removal of the dipping tray below the winding frame and reduces the weight of the winding frame itself.

[0027] The tension adjustment assembly includes a guide rod 21, a positioning nut 22, and an adjustment nut 23, each threadedly connected to the guide rod 21. The guide rod 21 is slidably connected to the fixed plate 11, with the fixed plate 11 positioned between the positioning nut 22 and the adjustment nut 23. The guide rod 21 is used to connect to the fixed plate 11; the positioning nut 22 secures the fixed plate to prevent it from sliding and also provides a positioning function. The adjustment nut is used to adjust the tension applied to the carbon fiber multifilament 3. In this embodiment, a butterfly nut is used to facilitate manual tension application.

[0028] In this embodiment, the side of the angle steel where the column 12 is not installed, that is, the side between the positioning nut 22 and the adjusting nut 23, is provided with a first through hole ( Figure 1 In the figure, the guide rod 21 is located in the first through hole); a second through hole 13 is provided for the guide rod 21, the positioning nut 22, and the adjusting nut 23 to pass through; a guide groove 14 is provided for the guide rod 21 to move between the first through hole and the second through hole 13. The diameter of the first through hole is larger than the diameter of the guide rod 21 but smaller than the maximum outer diameter of the positioning nut 22 and the adjusting nut 23 connected to the guide rod 21, with the purpose of applying tension to tighten the carbon fiber multifilament through the positioning nut 22 and the adjusting nut 23. The diameter of the second through hole 13 is larger than the diameter of the guide rod 21 and the maximum outer diameter of the positioning nut 22 and the adjusting nut 23 connected to the guide rod 21, with the purpose of achieving quick disassembly and assembly and improving work efficiency; at the same time, the second through hole 13 allows the adjusting nut 23 to pass through to loosen the carbon fiber multifilament 3, so that the carbon fiber multifilament 3 is immersed in the dipping disk 4, such as Figure 3 shown.

[0029] When in use, the carbon fiber multifilaments 3 of the same length are fixed between the two pillars 12 with the same number of windings (see Figure 2 ), the guide rod 21 is adjusted to the position of the second through hole 13, and the fixing plate 11 wrapped with the carbon fiber multifilament 3 is contracted and brought closer to loosen the carbon fiber multifilament 3, so that the carbon fiber multifilament 3 is immersed in the dipping plate 4 (see Figure 3 ), after soaking for a specified time, open the fixing plate 11, and then transfer the guide rod 21 from the second through hole 13 to the first through hole, and make the fixing plate 11 between the positioning nut 22 and the adjusting nut 23, and tighten the adjusting nut 23 with the same number of turns to ensure consistent tension (see Figure 5 After the above process is completed, the winding frame is placed in its original position (above the dipping tray 4) to dry the carbon fiber multifilament 3, and finally placed in an oven for curing. This process effectively avoids the problem of uneven tension in manual winding; the dipping process is transparent and visible, allowing for timely and effective process control; the area where the carbon fiber multifilament is wound on the column is free of glue contamination, avoiding a large amount of cleaning process; after dipping, it is dried in the original position, and the glue drips into the dipping tray, avoiding environmental pollution.

[0030] Example 2:

[0031] The difference between this embodiment and embodiment 1 is that, in this embodiment, the angle steel is not provided with a side where the column 12 is installed, that is, the side between the positioning nut 22 and the adjusting nut 23: only a first through hole for the guide rod 21 to pass through is provided. When in use, the fixing plate 11 is moved along the guide rod 21 by operating the positioning nut 22 and the adjusting nut 23. Figure 4 shown.

[0032] Example 3:

[0033] Based on the carbon fiber multifilament drawing sample preparation tool described in Example 1, this embodiment provides a carbon fiber multifilament drawing sample preparation method, comprising:

[0034] Winding the carbon fiber multifilament around the fixed plate assembly;

[0035] Adjust the tension adjustment component to relax the carbon fiber multifilaments wound on the fixed plate component and soak them in the glue;

[0036] After the soaking reaches the specified time, the tension adjustment component is adjusted to apply the required tension to the carbon fiber multifilaments wound on the fixed plate component, and the carbon fiber multifilaments with the glue are dried.

[0037] Example 4

[0038] The preparation method and performance test steps of carbon fiber multifilament tensile specimens are as follows:

[0039] Adjust the guide rod to the first through-hole and secure the fixed plate with an adjusting nut. Use scissors to cut the same length of Hengshen Co., Ltd. HF40S-12K carbon fiber multifilaments, then wind the multifilaments between the two pillars with the same number of windings and secure them. Mix E44 epoxy resin: methyl nadic anhydride (MNA): methylaminomethyl (DMP-30): acetone in a mass ratio of 20:18:1:36 in a rubber tray, prepare an appropriate amount of glue, and stir thoroughly to ensure uniform mixing. Place the carbon fiber multifilament stretching sample preparation tool of the present invention on the rubber tray, then loosen the adjusting nut, adjust the guide rod to the second through-hole, and use the adjusting nut to retract the fixed plate wrapped with the yarn bundle to loosen the yarn bundle and allow the yarn bundle to be immersed in the rubber tray. After soaking for the specified time, open the fixed plate between the positioning nut and the guide nut, then transfer the guide rod from the second through-hole to the first through-hole, and tighten the adjusting nut with the same number of windings to ensure consistent tension. After completing the above process, the winding frame was placed in its original position (above the rubber reel) to dry the tow, and finally placed in an oven for curing at 80°C for 0.5 h, 100°C for 0.5 h, and 120°C for 1.5 h. After curing, the tooling was removed, cooled, and the multifilament was cut and a paper reinforcement sheet was attached to obtain tensile specimens. All reagents used were commercially available.

[0040] At the same time, a comparative performance test experiment was conducted using a conventional dipped sample preparation method and a hanging weight sample preparation method, and multiple groups of test comparisons were conducted to ensure the reliability of the test data. The specific tensile properties of the carbon fiber multifilament are shown in Table 1. The table below uses the HF40S-12K carbon fiber multifilament sample prepared by Jiangsu Hengshen Co., Ltd. for comparative testing, but the test principle of this invention is applicable to carbon fiber multifilaments of various specifications.

[0041] Table 1 Tensile properties of carbon fiber multifilament

[0042]

[0043]

[0044] 1. To ensure the reliability of the test comparison, the multifilament used in the test was taken from the same ingot of HF40S-12K fiber;

[0045] 2. The tensile modulus is tested using a contact extensometer.

[0046] Example 5

[0047] The same operation as in Example 4 was used to prepare samples of HF30F-24K carbon fiber tows produced by Jiangsu Hengshen Co., Ltd. The tensile properties of the carbon fiber multifilaments are shown in Table 2, where a comparison was made using a conventional dipping sample preparation method.

[0048] Table 2

[0049]

[0050] 1. To ensure the reliability of the test comparison, the multifilament yarn used in the test was taken from the same ingot of HF30F-24K fiber;

[0051] 2. The tensile modulus is tested using a contact extensometer.

[0052] Comparison results show that the tensile strength test values ​​of the HF40S-12K carbon fiber produced by the present invention outperform those of conventional methods and the hanging weight method, with stable and discrete results. The tensile strength test values ​​of the HF30F-24K carbon fiber produced by the present invention outperform those of conventional methods and the hanging weight method, with stable and discrete results. This is due to the present invention's tension consistency and the preparation method of first dipping in resin and then adjusting tension, which avoids tension reduction. The tensile modulus test values ​​of the carbon fibers produced by the present invention are essentially equivalent to those of the conventional method and the hanging weight method.

[0053] This embodiment changes the traditional dipping order of carbon fiber multifilament sample preparation and adopts a process of dipping in glue first and then stretching. The dipping process is controllable and there is no risk of the carbon fiber multifilament loosening. At the same time, the tooling parts wound with the carbon fiber multifilament are not contaminated by the glue, avoiding a large amount of cleaning process. During the drying process of the carbon fiber multifilament after dipping in glue, the tooling described in the present invention does not need to be moved, and the glue drips into the glue tray, avoiding environmental pollution.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A carbon fiber multifilament drawing sample preparation method, characterized in that: A carbon fiber multifilament drawing sample making tool is used, including: A fixture plate assembly for winding carbon fiber multifilament; a tension adjustment assembly connected to the fixing plate assembly, for driving the fixing plate assembly to apply tension to the plurality of carbon fiber multifilaments wound on the fixing plate assembly; The fixed plate assembly includes a fixed plate and a plurality of columns mounted on the fixed plate, each of the columns being provided with at least one guide groove; The tension adjustment assembly includes a guide rod, a positioning nut and an adjusting nut respectively threadedly connected to the guide rod; the guide rod is slidably connected to the fixing plate, and the fixing plate is located between the positioning nut and the adjusting nut; The fixing plate is provided with: a first through hole for the guide rod to pass through; a second through hole for the guide rod, the positioning nut, and the adjusting nut to pass through; and a guide groove for the guide rod to move between the first through hole and the second through hole; The method comprises: Winding the carbon fiber multifilament around the fixed plate assembly; Adjust the tension adjustment component to relax the carbon fiber multifilaments wound on the fixed plate component and soak them in the glue; After the soaking reaches the specified time, the tension adjustment component is adjusted to apply the required tension to the carbon fiber multifilaments wound on the fixed plate component, and the carbon fiber multifilaments with the glue are dried.

2. The carbon fiber multifilament drawing sample preparation method according to claim 1, characterized in that: The upright column is connected to the fixing plate by bolts.

3. The carbon fiber multifilament drawing sample preparation method according to claim 1, characterized in that: The fixing plate is an angle steel.

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