A NOL ring preparation mold and preparation method

Abstract

The present invention relates to a NOL ring preparation mold and preparation method, comprising a support plate, a clamping cover, a lining ring, and a pressure cover; the support plate, the clamping cover, the lining ring, and the pressure cover are evenly distributed with light holes, and the support plate, the clamping cover, the lining ring, and the pressure cover can be connected and fixed by long bolts; the centers of the clamping cover, the lining ring, and the pressure cover are transitionally matched, and the centers of the clamping cover, the lining ring, and the pressure cover are on the same axis. The NOL ring preparation mold and preparation method of the present invention are simple to operate, low in cost, and high in efficiency. Multiple NOL rings can be obtained at one time, which greatly simplifies the preparation process, shortens the time for preparing NOL rings, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber composite material testing, and in particular to a NOL ring preparation mold and a preparation method. Background Art

[0002] Composite materials are often anisotropic materials, and their design and analysis methods are different from those of metal materials. The anisotropic properties of composite materials lead to differences in the performance test methods of composite materials and metal materials. The performance of composite materials is related to many factors such as resin matrix, reinforcement materials, process conditions, storage time and environment. Therefore, it is very necessary to test the performance of raw materials before designing composite materials.

[0003] Composite material performance testing is the basis for material selection, evaluation of reinforcement materials, resin matrix, interface performance, molding process conditions and manufacturing technology level, as well as product design. The fiber winding process is one of the manufacturing processes of resin-based composite materials. Under certain tension and linear conditions, the continuous fiber impregnated with resin is wound on the core mold at a certain angle. After curing at room temperature or high temperature, it is removed from the mold to obtain a product of a certain shape. There are three main forms of winding: annular winding, plane winding and spiral winding. The three methods have their own characteristics. The wet winding method is the most widely used because of its relatively simple equipment requirements and low manufacturing cost.

[0004] The NOL ring is a composite annular test piece formed by unidirectional fiber winding. Its performance is a measure of the wettability and adhesion of the interface between the fiber and the resin matrix, as well as its ability to transmit under stress. It is important in evaluating the tensile and shear properties of fiber composite materials. The shape and size of the NOL ring should comply with the standards and design drawings, and have high dimensional accuracy and surface roughness requirements. In the production process of the NOL ring, the mold used for production is required to facilitate the winding, curing and demolding of the annular specimen, and to wind multiple NOL ring specimens at a time to improve production efficiency.

[0005] At present, NOL ring samples can be made by a single-ring winding method. The dried fiber is drawn out from the yarn ball, passed through a guide roller, and impregnated with glue through a glue tank. It is then wound on a previously cleaned mold and cured after winding. After curing, the single-ring sample undergoes a series of surface processing to form a NOL ring. This method has a low preparation efficiency. For example, GB / T1458 requires 6 NOL rings to be stretched, and the winding process will occupy the production winding machine, resulting in reduced production efficiency. In addition, the cutting method can also be used to prepare NOL rings, but in order to ensure a smooth cut, special equipment is required. However, the NOL rings prepared by the cutting method have lower performance than single-ring winding due to the presence of broken yarns. Summary of the invention

[0006] In order to solve the shortcomings of the prior art, the present invention proposes a NOL ring preparation mold and a preparation method, designs a precise, efficient and convenient NOL ring winding tooling mold, simplifies the NOL ring production process, improves production efficiency and dimensional accuracy, and improves the accuracy of composite material performance index evaluation.

[0007] To achieve the above objectives, the technical solutions adopted by the present invention include:

[0008] A NOL ring preparation mold, characterized by comprising a support plate, a clamping cover, a liner ring, and a pressure cover;

[0009] The support plate, the clamp cover, the lining ring and the pressure cover are evenly provided with light holes, and the support plate, the clamp cover, the lining ring and the pressure cover can be connected and fixed by long bolts;

[0010] The centers of the clamping cover, the lining ring and the pressure cover are transitionally matched, and the centers of the clamping cover, the lining ring and the pressure cover are on the same axis.

[0011] Furthermore, the support plate is used to connect the NOL ring preparation mold with the winding machine shaft.

[0012] Furthermore, the edge of the liner ring is a right-angle edge without chamfers or rounded corners.

[0013] Further, the inner diameter of the NOL ring is D and the thickness is h;

[0014] The outer diameter of the liner ring is the same as the inner diameter of the NOL ring, and the outer diameter of the liner ring is D;

[0015] The outer diameter of the clamping cover is the same as the outer diameter of the NOL ring, and the outer diameter of the clamping cover is D+2*h.

[0016] Furthermore, four threaded holes are evenly distributed around the clamping cover and the pressure cover, which are used to lift the clamping cover to demould the NOL ring.

[0017] Furthermore, a threaded hole is provided at the center of the liner ring for removing the liner ring from the clamping cover by means of bolts.

[0018] The present invention also relates to a NOL ring preparation method, characterized in that the NOL ring preparation operation is performed using the NOL ring preparation mold as described above.

[0019] Further, the method comprises:

[0020] Step S1. Insert the long bolts into the light holes of the support plate, clamp cover, liner ring and gland of the NOL ring preparation mold, assemble the NOL ring preparation mold, connect the NOL ring preparation mold to the rotating shaft of the winding machine through the support plate, and spray a release agent on the surface of the NOL ring preparation mold;

[0021] Step S2. Wrap the fiber yarn tape around the surface of the lining ring, and make the height of the fiber yarn tape flush with the clamping cover after winding;

[0022] Step S3. After the winding is completed, the NOL ring preparation mold is removed from the winding machine shaft and placed in a curing oven for curing;

[0023] Step S4. After curing is completed, remove the long bolts, screw the bolts into the threaded holes of the gland, and push the gland out to separate it from the liner ring;

[0024] Step S5. Push the bolt into the threaded hole of the liner ring, and remove the liner ring from the next clamp cover so that the prepared NOL ring is completely exposed;

[0025] Step S6. Use the same method to remove the remaining NOL rings, assemble the NOL ring preparation mold, and use it for the next NOL ring preparation.

[0026] The beneficial effects of the present invention are:

[0027] The NOL ring preparation mold and preparation method of the present invention are simple to operate, convenient to demould, low in cost, and high in efficiency. A plurality of NOL rings can be obtained at one time, which greatly simplifies the preparation process, shortens the preparation time of the NOL ring, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of a mold structure for preparing a NOL ring according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the NOL ring structure of an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of another mold structure for preparing a NOL ring according to an embodiment of the present invention.

[0031] Explanation of the accompanying figure numbers: 1-support plate, 2-clamp cover, 3-lining ring, 4-pressure cover, 5-bright hole, 6-threaded hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments, and these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0033] Embodiment 1

[0034] like Figure 1 As shown, the embodiment of the present invention discloses a NOL ring preparation mold, wherein the mold structure includes a support plate 1, a clamping cover 2, a liner ring 3, and a pressure cover 4, wherein the support plate 1, the clamping cover 2, the liner ring 3, and the pressure cover 4 are evenly distributed with light holes 5 (such as Figure 3 As shown), the number of light holes is generally 3-4. The four parts of the support plate 1, the clamp cover 2, the liner ring 3 and the pressure cover 4 can be connected and fastened by long bolts. The centers of the clamp cover 2, the liner ring 3 and the pressure cover 4 are transition-fitted. The centers of the clamp cover 2, the liner ring 3 and the pressure cover 4 are on the same axis to ensure the coaxiality and flatness of the NOL ring preparation mold. The axes of each component are aligned within a certain tolerance range to ensure that the assembled components will not swing or deviate when rotated, to ensure the flatness of the surface of the NOL ring preparation mold, and to prevent dimensional deviation or uneven surface during the processing. This structure helps to improve the accuracy and performance of the NOL ring preparation mold, ensuring that the produced NOL ring has high dimensional accuracy and smooth surface, meeting the test standard requirements.

[0035] In this embodiment, the support plate 1 is used to connect the NOL ring preparation mold with the winding machine shaft, so that the torque of the winding machine can be transmitted to the mold.

[0036] In this embodiment, the edge of the liner ring 3 is a right-angle edge, and chamfering or rounding is not allowed, so that the inner surface of the NOL ring is flat, ensuring smooth demoulding.

[0037] In this embodiment, if Figure 2 As shown, the inner diameter of the NOL ring is D, the thickness is h, the outer diameter of the liner ring 3 is the same as the inner diameter of the NOL ring, and the outer diameter of the liner ring 3 is D. The outer diameter of the clamping cover 2 is the same as the outer diameter of the NOL ring, and the outer diameter of the clamping cover 2 is D+2*h. Multiple liner rings 3 are alternately connected to the clamping cover 2. Since the outer diameter of the liner ring 3 is smaller than the outer diameter of the clamping cover 2, when the liner ring 3 is alternately connected to the clamping cover 2, a groove will be formed at the liner ring 3 between the two clamping covers 2. The NOL ring preparation mold of the present invention has multiple grooves, which can be used as a winding space to prepare multiple NOL rings at one time. The wound NOL ring is flush with the outer side of the clamping cover 2 to prevent fiber or resin from winding around the outer side of the groove, thereby improving the accuracy of the NOL ring size.

[0038] In this embodiment, if Figure 3 As shown, four threaded holes 6 are evenly distributed around the clamping cover 2 and the pressing cover 4, which are used to lift the clamping cover 4 to demould the NOL ring.

[0039] In this embodiment, a threaded hole is provided at the center of the backing ring 3 for removing the backing ring 3 from the clamping cover 2 by means of bolts, so that the NOL ring is completely exposed, which is more conducive to demoulding.

[0040] The use of the NOL ring preparation mold of the present invention to prepare NOL rings greatly simplifies the preparation process, can obtain multiple NOL rings at one time, shortens the preparation time of NOL rings, and improves production efficiency.

[0041] Embodiment 2

[0042] The embodiment of the present invention also discloses a method for preparing a NOL ring, the steps of which include:

[0043] Step S1. Insert the long bolts into the light holes of the support plate, clamp cover, liner ring and gland of the NOL ring preparation mold, assemble the NOL ring preparation mold, connect the NOL ring preparation mold to the rotating shaft of the winding machine through the support plate, and spray a release agent on the surface of the NOL ring preparation mold;

[0044] Step S2. Wrap the fiber yarn tape around the surface of the lining ring, and make the height of the fiber yarn tape flush with the clamping cover after winding;

[0045] Step S3. After the winding is completed, the NOL ring preparation mold is removed from the winding machine shaft and placed in a curing oven for curing;

[0046] Step S4. After curing is completed, remove the long bolts, screw the bolts into the threaded holes of the gland, and push the gland out to separate it from the liner ring;

[0047] Step S5. Push the bolt into the threaded hole of the liner ring, and remove the liner ring from the next clamp cover so that the prepared NOL ring is completely exposed;

[0048] Step S6: Use the same method to remove the remaining NOL rings.

[0049] The NOL ring preparation method of the present invention has the advantages of simple operation, low cost and high efficiency, and can obtain multiple NOL rings at one time, thereby shortening the NOL ring preparation time and improving production efficiency.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A NOL ring preparation mold, characterized in that: Including support plate, clamp cover, lining ring and pressure cover; The support plate, the clamp cover, the lining ring and the pressure cover are evenly provided with light holes, and the support plate, the clamp cover, the lining ring and the pressure cover can be connected and fixed by long bolts; The centers of the clamping cover, the lining ring and the pressure cover are transitionally matched, and the centers of the clamping cover, the lining ring and the pressure cover are on the same axis.

2. The NOL ring preparation mold according to claim 1, characterized in that: The support plate is used to connect the NOL ring preparation mold with the winding machine shaft.

3. The NOL ring preparation mold according to claim 1, characterized in that: The edge of the liner ring is a right-angle edge without chamfers or rounded corners.

4. The NOL ring preparation mold according to claim 1, characterized in that: The inner diameter of the NOL ring is D and the thickness is h; The outer diameter of the liner ring is the same as the inner diameter of the NOL ring, and the outer diameter of the liner ring is D; The outer diameter of the clamping cover is the same as the outer diameter of the NOL ring, and the outer diameter of the clamping cover is D+2*h.

5. The NOL ring preparation mold according to claim 1, characterized in that: The clamping cover and the pressure cover are evenly distributed with four threaded holes around them, which are used to lift up the clamping cover to demould the NOL ring.

6. The NOL ring preparation mold according to claim 1, characterized in that: A threaded hole is arranged at the center of the backing ring for removing the backing ring from the clamping cover by means of bolts.

7. A method for preparing a NOL ring, characterized in that: The method comprises performing a NOL ring preparation operation using the NOL ring preparation mold according to any one of claims 1 to 6.

8. The method according to claim 7, characterized in that The method comprises: S1. Through the long bolts, the NOL ring preparation mold is penetrated into the light holes of the support plate, the clamp cover, the liner ring, and the gland, the NOL ring preparation mold is assembled, the NOL ring preparation mold is connected to the winding machine shaft through the support plate, and the release agent is sprayed on the surface of the NOL ring preparation mold; S2. Wrap the fiber yarn tape around the surface of the lining ring, and make sure that the height of the fiber yarn tape after winding is flush with the clamp cover; S3. After the winding is completed, the NOL ring preparation mold is removed from the winding machine shaft and placed in a curing oven for curing; S4. After curing is completed, remove the long bolts, screw the bolts into the threaded holes of the gland, and push the gland out to separate it from the liner ring; S5. Push the bolt into the threaded hole of the liner ring and remove the liner ring from the next clamp cover so that the prepared NOL ring is completely exposed; S6. Use the same method to remove the remaining NOL rings.

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