Variable diameter nol ring stripper and method

Abstract

A variable diameter NOL ring demolding device and method, from right to left, including support device, demolding device and positioning device, the method is as follows: the straight plate on the circular tube is inserted into the radial rectangular groove on the support disc; then the mandrel is connected with the support disc, the circular tube and the positioning large disc in turn through the first threaded through hole and the second threaded through hole; the positioning screw rod is connected with the small threaded hole on the straight plate through the through hole on the positioning large disc, the mandrel is connected with the winding machine and the winding process is carried out; after winding is completed, the positioning large disc is removed, the positioning screw rod is moved to the center of the circle, which can drive the straight plate to move radially, so that the diameter of the circular tube is reduced, and the demolding is completed. The diameter is changed in the form of cam mechanism, the NOL ring mold realizes the expansion and contraction in the diameter direction, and the NOL ring product is demolded quickly. The device not only facilitates the production of NOL ring, but also does not affect the standard of NOL, and realizes the change of mold diameter during the demolding process, so that the purpose of quick demolding is achieved.

Description

Technical Field

[0001] This invention relates to the field of demolding device technology, specifically to a demolding device and method for a variable diameter NOL ring. Background Technology

[0002] Advanced resin-based composite materials have been widely used in aerospace, automotive, and other fields due to their unique advantages such as high specific strength and specific stiffness, strong designability, fatigue resistance, and good corrosion resistance. With the increasing use of composite structural components, the performance requirements are also rising. As the key to realizing the performance of structural materials, molding processes and parameters have received widespread attention. However, manufacturing large rotating or cylindrical products consumes a large amount of material and makes it difficult to obtain sufficient data to determine patterns. Therefore, macroscopic mechanical testing based on NOL rings is generally used to obtain a large amount of data to deduce the performance of corresponding composite products. This makes the NOL ring winding process one of the important processes in carbon fiber composite molding experiments.

[0003] In this process, the finished product is typically wound onto a corresponding NOL molding die, then cured and demolded to form NOL ring samples that meet the national standard GB / T 1458—2008. However, separation between the die and the carbon fiber product is difficult during demolding. This is mainly because during the rotary winding process, the outer surface of the die needs to be wrapped with a release cloth, then release wax is applied to the outer surface of the release cloth, resin-based carbon fibers are wound, and finally cured to obtain the fiber-wound finished product. However, due to the heat curing process, the release cloth and the finished product are bonded very tightly, resulting in extremely high friction. Forceful demolding from the side requires enormous external force and can easily damage the NOL ring finished product, rendering the obtained data invalid or inaccurate. Therefore, a demolding process that does not damage the finished product is difficult to perform. How to demold NOL rings efficiently and with low damage is one of the key issues that urgently needs to be addressed in researching and improving the design and manufacturing level of composite material structures. Summary of the Invention

[0004] Technical problem solved: In view of the difficulty in achieving demolding of finished products without damage in the existing technology, the present invention provides a demolding device and method for NOL rings with variable diameter. The device uses a screw to drive the radial movement of a straight plate, and then the straight plate drives the position of the round tube, thereby realizing the change of the diameter of the round tube. Demolding with low damage or even no damage is achieved by changing the diameter. The structure is simple and realizes a more convenient, efficient and low-damage demolding method for NOL finished products.

[0005] Technical solution: A variable diameter NOL ring demolding device, wherein the variable diameter NOL ring demolding device is connected to a winding machine via a mandrel with external threads for winding, and the variable diameter NOL ring demolding device includes, from right to left, a support device, a demolding device, and a positioning device.

[0006] The support device is a support disk, which includes a disk body, a first threaded through hole at the center of the disk body, and several radial rectangular grooves penetrating the sidewall of the disk to the center. A non-through groove is provided on the left end face of the support disk along the first threaded through hole. This support structure supports the entire mechanism. An internal threaded hole can be connected to a screw (mandrel) for fixing the device to the winding machine and for driving the entire mechanism to rotate. The purpose of the non-through grooves is that the positioning screw can move on the groove to achieve diameter changes when the diameter of the demolding mold changes.

[0007] The demolding device includes a circular tube and several sets of NOL ring mold grooves. The inner diameter of the circular tube is smaller than the outer diameter of the supporting disc. The circular tube adopts a multi-lobed structure. Each lobe of the circular tube has a straight plate at one end pointing towards the center. The end of the straight plate near the center has a small threaded hole. The straight plate is inserted into a radial rectangular groove, and the small threaded hole on the straight plate extends into a non-through groove. When the straight plate is fully inserted into the radial rectangular groove, the small threaded hole on the straight plate is tangent to or does not overlap with the first threaded through hole. The several sets of NOL ring mold grooves are evenly arranged radially on the outer surface of the circular tube for winding NOL rings. The small threaded hole on the straight plate is used to ensure that the diameter of the circular tube does not change during the winding process and to change the diameter during the demolding process to achieve the purpose of quick and efficient demolding.

[0008] The positioning device includes a large positioning disk and several positioning screws. The large positioning disk has a second threaded through hole at its center and several through holes on the large positioning disk that are evenly distributed around the second threaded through hole and are concentric with the positions of the small threaded holes on the straight plate (the concentricity is to ensure that the diameter does not change during winding). One end of the positioning screw is connected to the through hole on the large positioning disk by a nut, and the other end is connected to the small threaded hole on the straight plate. The number of through holes on the large positioning disk, positioning screws, straight plate and radial rectangular grooves are the same.

[0009] The first and second threaded through holes are threaded and used in conjunction with the external thread of the mandrel.

[0010] Preferably, the variable diameter NOL ring demolding device further includes a waxing device, which includes a waxing screw and a waxing fixture for holding demolding wax. One end of the waxing screw is movably connected to the edge of the positioning large disc, and the other end extends toward the support disc. The waxing fixture is axially movably connected to the waxing screw.

[0011] Preferably, the outer edge of the positioning disc has several large arc-shaped grooves corresponding to the multi-lobed structure of the circular tube. One end of the waxing screw is slidably and detachably connected to the large arc-shaped grooves. The waxing screw can move circumferentially along the outer edge of the positioning disc and is detachable. The positioning screw can be detached at any time and can move freely circumferentially on the large disc of the positioning structure to achieve the purpose of uniformly applying release wax.

[0012] Preferably, the non-through groove includes a cylindrical groove and end face rectangular grooves that are connected to it in number and position corresponding to the radial rectangular grooves.

[0013] Preferably, the positioning device further includes a small positioning disc. The small positioning disc has a third threaded through-hole at its center and circular key-shaped grooves evenly distributed along the outer side of the third threaded through-hole. The number and position of the circular key-shaped grooves correspond to the small threaded holes on the straight plate. The third threaded through-hole has threads that cooperate with the external threads of the mandrel. One end of the positioning screw moves within the circular key-shaped groove. The circular key-shaped groove allows the positioning screw to move, and the movement of the positioning screw on it achieves the purpose of changing the diameter of the circular tube of the demolding structure. This allows it to be made to the diameter required during mold making, or it can be reduced in size during the demolding process to directly complete demolding.

[0014] Preferably, the small positioning disc is positioned between the large positioning disc and the round tube, or is used alternately with the large positioning disc.

[0015] Preferably, the inner diameter of the NOL ring mold groove is the diameter of a standard NOL ring, which conforms to GB / T 1458—2008. During the winding process, the diameter can be varied to produce NOL rings of the national standard width, and multiple sets can be produced simultaneously.

[0016] Preferably, the circular tube has a three-lobed structure.

[0017] Based on the above-mentioned variable diameter NOL ring demolding device, the variable diameter NOL ring demolding method comprises the following steps: inserting the straight plate on the round tube into the radial rectangular groove on the support disc; then connecting the mandrel to the support disc, the round tube, and the positioning large disc in sequence through the first threaded through hole and the second threaded through hole; connecting the positioning screw through the through hole on the positioning large disc to the small threaded hole on the straight plate; connecting the mandrel to the winding machine and performing the winding process; after winding is completed, removing the positioning large disc and moving the positioning screw towards the center, which drives the straight plate to move radially, thereby reducing the diameter of the round tube and completing the demolding.

[0018] The present invention provides a variable diameter NOL ring demolding device that can pass through a threaded through hole in the support structure and clamp it on the winding machine. After the NOL ring test piece is wound, the positioning part can be disassembled in reverse to achieve the purpose of demolding by changing the diameter of the mold.

[0019] Beneficial Effects: This invention utilizes a positioning screw moving on a small positioning disc groove to drive the radial movement of a straight plate, which in turn moves the position of the cylindrical tube, thus achieving diameter changes. This allows for more convenient, efficient, and low-damage demolding of NOL (non-linear optical loop) finished products. Existing NOL ring molds are basically of two types: one is a single national standard mold, requiring multiple sets of molds to be made together to produce NOL rings, with the entire process from production to demolding primarily done manually; the other involves winding the finished cylindrical product onto a cylindrical mold and then cutting it, such as with a waterjet cutter, which easily damages the product. Compared to these two common manufacturing methods, this invention saves manpower and time while ensuring accuracy and integrity.

[0020] This invention features multiple grooves on a circular tube, allowing for the simultaneous winding of multiple sets of NOL samples. This eliminates the installation and disassembly time required for a single NOL ring mold, thereby improving the efficiency of NOL ring winding.

[0021] This invention features a movable and detachable waxing screw that drives a clamping block to quickly and efficiently apply release wax, reducing testing time and minimizing release wax consumption. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention (before operation).

[0023] Figure 2 This is a three-dimensional structural diagram of the support structure of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the demolding structure of the present invention;

[0025] Figure 4 This is one of the three-dimensional structural diagrams of the positioning structure of the present invention (connection support and demolding structure);

[0026] Figure 5 This is one of the three-dimensional structural diagrams of the positioning structure of the present invention (the entire structure is fixed during the winding process);

[0027] Figure 6 This is a three-dimensional structural diagram of the wax coating structure of the present invention;

[0028] The numbers represent the following: 1 Supporting disc, 2-1 First threaded through hole, 2-2 Second threaded through hole, 2-3 Third threaded through hole, 3 Mandrel, 4 Radial rectangular groove, 5 End face rectangular groove, 6 Straight plate, 7 Round tube, 8 NOL ring mold groove, 9 Small threaded hole on straight plate, 10 Positioning small disc, 11 Circular key groove, 12 Positioning screw, 13 Positioning large disc, 14 Through hole on positioning large disc, 15 Large arc groove, 16 Waxed screw, 17 Waxed fixture.

[0029] Among them: the mandrel 3 passes through the support structure, demolding structure and positioning structure, and is fixed by clamping both ends on the winding machine; the positioning large disc 13 is fastened during the winding process, and can only be changed after being disassembled during the demolding process; the waxing structure is only installed when the demolding wax is applied before winding, and can be disassembled after use. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that the advantages and features of the present invention can be better understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0031] Example 1

[0032] A variable diameter NOL ring demolding device, see [link to documentation]. Figure 1 , 2 3 and 5, the variable diameter NOL ring demolding device is connected to the winding machine through the externally threaded mandrel 3 for winding. The variable diameter NOL ring demolding device includes a support device, a demolding device and a positioning device from right to left.

[0033] The support device has slots cut into the end face and side face of the cylindrical structure to meet the requirements of stable installation and precise positioning of subsequent devices, while also meeting the radial movement requirements required for the mold to change diameter.

[0034] The demolding device consists of three radially aligned straight plates that transition into a support structure, with the axially aligned threaded holes positioning the plates to ensure a constant diameter during operation. This demolding device controls the diameter of the cylindrical mold by moving the three straight plates radially, allowing for quick demolding after the mold is finished and the mold diameter can be reduced.

[0035] The positioning device is bolted to the demolding device at the working position. It can be disassembled during the demolding stage to ensure smooth demolding and achieve the purpose of quick demolding.

[0036] Specifically:

[0037] The support device is a support disk 1, which includes a disk body, a first threaded through hole 2-1 located at the center of the disk body, and several radial rectangular grooves 4 penetrating the sidewall of the disk to the center. A non-penetrating groove is provided on the left end face of the support disk 1 along the first threaded through hole 2-1. The non-penetrating groove is used to position the radial movement of the positioning screw 12, thereby driving the demolding device to control the diameter of the mold. The first threaded through hole 2-1 is used to install the mandrel 3, which can be clamped on the winding machine. The radial rectangular grooves 4 are used to install the straight plate 6 of the demolding device, ensuring a tight connection between the support device and the demolding device.

[0038] The demolding device includes a circular tube 7 and several sets of NOL ring mold grooves 8. The inner diameter of the circular tube 7 is smaller than the outer diameter of the supporting disc 1. The circular tube 7 adopts a multi-lobed structure, with a straight plate 6 at one end of each lobe pointing towards the center. The straight plate 6 has a small threaded hole 9 at its end near the center. The straight plate 6 is inserted into a radial rectangular groove 4, and the small threaded hole 9 extends into a non-through groove. When the straight plate 6 is fully inserted into the radial rectangular groove 4, the small threaded hole 9 is tangent to or does not overlap with the first threaded through hole 2-1. The several sets of NOL ring mold grooves 8 are evenly arranged radially on the outer surface of the circular tube 7 for winding NOL rings. The small threaded hole 9 on the straight plate is used to connect the support device and the positioning device. The width of the NOL ring mold groove 8 is the standard width of the NOL ring.

[0039] The positioning device includes a large positioning disk 13 and several positioning screws 12. The large positioning disk 13 has a second threaded through hole 2-2 at its center and several large positioning through holes 14 evenly distributed around the second threaded through hole 2-2, which are concentrically corresponding to the positions of the small threaded holes 9 on the straight plate. One end of the positioning screw 12 is connected to the large positioning through hole 14 by a nut, and the other end is connected to the small threaded hole 9 on the straight plate. The number of large positioning through holes 14, positioning screws 12, straight plate 6 and radial rectangular grooves 4 are the same.

[0040] The first threaded through hole 2-1 and the second threaded through hole 2-2 are threaded and used in conjunction with the external thread of the mandrel 3.

[0041] Based on the above-mentioned variable diameter NOL ring demolding device, the variable diameter NOL ring demolding method is as follows: Insert the straight plate 6 on the round tube 7 into the radial rectangular groove 4 on the support disc 1; then connect the mandrel 3 to the support disc 1, the round tube 7 and the positioning large disc 13 in sequence through the first threaded through hole 2-1 and the second threaded through hole 2-2; connect the positioning screw 12 through the through hole 14 on the positioning large disc to the small threaded hole 9 on the straight plate; connect the mandrel 3 to the winding machine and perform the winding process; the NOL ring mold groove 8 on the round tube 7 is the NOL ring winding test piece mold; adjust the radial position of the straight plate 6 to achieve a standard NOL ring diameter of 150mm; after winding, remove the positioning large disc 13, move the positioning screw 12 towards the center, which will drive the straight plate 6 to move radially, thereby reducing the diameter of the round tube 7 and completing the demolding.

[0042] The national standard for NOL rings, GB / T 1458-2008, specifies the dimensions as follows: diameter 150mm, width 6mm, and thickness 1.4-1.6mm (which can be varied according to actual conditions). In this invention, the mold portion has a groove diameter of 150mm and a protrusion diameter of 156mm, which can be reduced to 140mm inwards to ensure complete demolding of the NOL ring.

[0043] Example 2

[0044] Same as Example 1, except that, see [link to Example 1] Figure 6 The variable diameter NOL ring demolding device also includes a waxing device, which is installed on the circumferential groove of the positioning mechanism by bolts and screws. Its circumferential movement can achieve uniform application of demolding wax. After the demolding wax is applied, it can be removed without affecting the normal operation of the mold.

[0045] Specifically, the waxing device includes a waxing screw 16 and a waxing clamp 17 for holding release wax. One end of the waxing screw 16 is movably connected to the edge of the positioning large disc 13, and the other end extends toward the support disc 1. The waxing clamp 17 is axially movably connected to the waxing screw 16. The waxing clamp 17 moves axially to hold the release wax, while the waxing screw 16 moves circumferentially within the large arc of the positioning device and is detachable. The two work together to achieve uniform application of the NOL ring mold on the release device.

[0046] The outer edge of the positioning disc 13 is provided with several large arc-shaped grooves 15 corresponding to the multi-lobed structure of the circular tube 7. One end of the waxing screw 16 is slidably and detachably connected to the large arc-shaped grooves 15. The waxing screw 16 can move circumferentially along the outer edge of the positioning disc 13 and is detachable.

[0047] The non-through groove includes cylindrical grooves and end face rectangular grooves 5 that are connected to it and whose number and position correspond to the radial rectangular grooves 4.

[0048] See Figure 4 The positioning device also includes a positioning small disc 10. The positioning small disc 10 has a third threaded through hole 2-3 at its center and circular key-shaped grooves 11 evenly distributed along the outer side of the third threaded through hole 2-3. The number and position of the circular key-shaped grooves 11 correspond to the small threaded holes 9 on the straight plate. The third threaded through hole 2-3 is threaded and is used in conjunction with the external thread of the mandrel 3. One end of the positioning screw 12 moves within the circular key-shaped groove 11.

[0049] The small positioning disc 10 is positioned between the large positioning disc 13 and the circular tube 7, or used alternately with the large positioning disc 13. The large positioning disc 13 ensures the positioning of the NOL ring mold of the demolding device, laying the foundation for the accuracy of NOL ring manufacturing. Its left end face has three large arc-shaped grooves for installing a detachable demolding wax application device. The small positioning disc 10 secures the demolding device and the support device to the left end face of the support device. Its left end face has three rectangular grooves for moving a screw with a variable diameter, thus changing the mold diameter of the demolding device. A threaded through hole is located in the center to ensure the three devices are concentric. Another part is threadedly connected to the circular tube portion of the demolding device.

[0050] The inner diameter of the groove 8 of the NOL ring mold is the diameter of the standard NOL ring, which is GB / T 1458—2008.

[0051] The circular tube 7 adopts a three-lobed structure.

[0052] The demolding method for variable diameter NOL rings based on the above-mentioned device comprises the following steps:

[0053] S1. Insert the straight plate 6 on the round tube 7 into the radial rectangular groove 4 on the supporting disc 1;

[0054] S2. Then the mandrel 3 is connected sequentially to the support disc 1, the round tube 7 and the positioning large disc 13 through the first threaded through hole 2-1 and the second threaded through hole 2-2.

[0055] S3. Connect the positioning screw 12 through the through hole 14 on the positioning large disc to the small threaded hole 9 on the straight plate. Connect the mandrel 3 to the winding machine and perform the winding process. The NOL ring mold groove 8 on the round tube 7 is the NOL ring winding test piece mold. Adjust the radial position of the straight plate 6 to achieve the winding of the standard diameter of 150mm of NOL ring.

[0056] S4. Before the winding process, connect one end of the waxing screw 16 in the waxing device to the large arc groove 15, and then slide the waxing fixture 17 axially. Apply wax to each NOL ring mold groove 8 through the release wax held on the waxing fixture 17. After the waxing is completed, remove the waxing device.

[0057] S5. After winding is completed, remove the large positioning disc 13 and move the positioning screw 12 towards the center in the circular key-shaped groove 11 of the small positioning disc 10. This will drive the straight plate 6 to move radially, thereby reducing the diameter of the round tube 7 and completing the demolding.

[0058] This specification describes the principles and implementation methods of the present invention using specific winding processes. The above examples are merely for aiding understanding of the method and core ideas of the present invention; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as limiting the present invention.

Claims

1. A variable diameter NOL ring demolding device, wherein the variable diameter NOL ring demolding device is connected to a winding machine via a threaded mandrel (3) for winding, characterized in that, The variable diameter NOL ring demolding device includes, from right to left, a support device, a demolding device, and a positioning device. The support device is a support disk (1). The support disk (1) includes a disk body, a first threaded through hole (2-1) located at the center of the disk body, and several radial rectangular grooves (4) that penetrate the side wall of the disk to the center. The left end face of the support disk (1) is provided with a non-through groove along the first threaded through hole (2-1). The demolding device includes a round tube (7) and several sets of NOL ring mold grooves (8). The inner diameter of the round tube (7) is smaller than the outer diameter of the supporting disc (1). The round tube (7) adopts a multi-lobed structure. Each lobe of the round tube has a straight plate (6) pointing towards the center. The straight plate (6) has a small threaded hole (9) on the straight plate near the center. The straight plate (6) is inserted into the radial rectangular groove (4), and the small threaded hole (9) on the straight plate extends into the non-through groove. When the straight plate (6) is fully inserted into the radial rectangular groove (4), the small threaded hole (9) on the straight plate is tangent to or does not overlap with the first threaded through hole (2-1). The several sets of NOL ring mold grooves (8) are evenly arranged radially on the outer surface of the round tube (7) for winding NOL rings. The positioning device includes a large positioning disk (13) and several positioning screws (12). The large positioning disk (13) has a second threaded through hole (2-2) at its center and several large positioning through holes (14) evenly distributed around the second threaded through hole (2-2) and corresponding to the positions of the small threaded holes (9) on the straight plate. One end of the positioning screw (12) is connected to the large positioning through hole (14) by a nut, and the other end is connected to the small threaded hole (9) on the straight plate. The number of large positioning through holes (14), positioning screws (12), straight plate (6) and radial rectangular grooves (4) is the same. The first threaded through hole (2-1) and the second threaded through hole (2-2) are provided with threads, which are used to cooperate with the external thread of the mandrel (3); The variable diameter NOL ring demolding device also includes a waxing device, which includes a waxing screw (16) and a waxing clamp (17) for holding demolding wax. One end of the waxing screw (16) is movably connected to the edge of the positioning large disc (13), and the other end extends toward the support disc (1). The waxing clamp (17) is axially movably connected to the waxing screw (16). The outer edge of the positioning large disc (13) is provided with several large arc-shaped grooves (15) corresponding to the multi-lobed structure of the circular tube (7). One end of the waxing screw (16) is slidably and detachably connected to the large arc-shaped grooves (15). The waxing screw (16) moves circumferentially along the outer edge of the positioning large disc (13). It is detachable; the non-through groove includes a cylindrical groove and an end face rectangular groove (5) that is connected to it and whose number and position correspond to the radial rectangular groove (4); the positioning device also includes a positioning small disc (10), the positioning small disc (10) is provided with a third threaded through hole (2-3) in the center and a circular key-shaped groove (11) evenly distributed along the outside of the third threaded through hole (2-3). The number and position of the circular key-shaped groove (11) correspond to the small threaded hole (9) on the straight plate. The third threaded through hole (2-3) is provided with a thread and is used in conjunction with the external thread of the mandrel (3). One end of the positioning screw (12) moves in the circular key-shaped groove (11).

2. The variable diameter NOL ring demolding device according to claim 1, characterized in that, The positioning small disc (10) is located between the positioning large disc (13) and the round tube (7) or is used alternately with the positioning large disc (13).

3. The variable diameter NOL ring demolding device according to claim 1, characterized in that, The inner diameter of the groove (8) of the NOL ring mold is the diameter of the standard NOL ring, which is GB / T 1458—2008.

4. The variable diameter NOL ring demolding device according to claim 1, characterized in that, The circular tube (7) adopts a three-lobed structure.

5. A method for demolding a variable diameter NOL ring based on the variable diameter NOL ring demolding device according to claim 1, characterized in that, The steps are as follows: Insert the straight plate (6) on the round tube (7) into the radial rectangular groove (4) on the support disc (1); then connect the mandrel (3) to the support disc (1), the round tube (7) and the positioning disc (13) in sequence through the first threaded through hole (2-1) and the second threaded through hole (2-2); connect the positioning screw (12) through the through hole (14) on the positioning disc to the small threaded hole (9) on the straight plate, connect the mandrel (3) to the winding machine and perform the winding process; after the winding is completed, remove the positioning disc (13), move the positioning screw (12) towards the center, which will drive the straight plate (6) to move radially, thereby reducing the diameter of the round tube (7) and completing the demolding.

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