Manufacturing method of cap-shaped stringer bottom rhodomyrtus tomentosa and rhodomyrtus tomentosa

Abstract

The invention belongs to the technical field of cap-shaped stringer stiffened wall plate manufacturing, and discloses a manufacturing method of a cap-shaped stringer bottom rhodomyrtus tomentosa strip and the rhodomyrtus tomentosa strip. Wherein the rhodomyrtus tomentosa strips are used for filling a triangular area between the R angle at the bottom of the cap-shaped stringer and the skin. The cap-shaped stringer bottom rhodomyrtus tomentosa manufacturing method specifically comprises the following steps that S100, the cross section shape of the rhodomyrtus tomentosa is constructed according to the shape of a triangular area, and the cross section area S0 of the rhodomyrtus tomentosa is calculated; s200, according to the cross sectional area S0 of the rhodomyrtus tomentosa strips obtained in the step S100, the cross sectional area S1 of the original element is calculated, S1 = K * S0, and K is larger than 1; s300, the original part is manufactured according to the cross sectional area S1, obtained in the step S200, of the original part; and S400, the original piece is extruded into a rhodomyrtus tomentosa strip matched with the triangular area in shape through a mold. The manufacturing method of the cap-shaped stringer bottom rhodomyrtus tomentosa strip is easy to operate, the manufacturing efficiency of the rhodomyrtus tomentosa strip is high, the production cost is low, and the rhodomyrtus tomentosa strip manufactured through the method is small in size and better in fitness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hat stringer stiffened panel manufacturing, in particular to a hat stringer bottom twist strip manufacturing method and twist strip. BACKGROUND

[0002] The twist strip is a functional filling material in the hat stringer stiffened panel structure of composite materials, and is specially used to fill the triangular area formed by the R angle of the hat stringer bottom and the skin. By setting the twist strip, local fiber wrinkles and resin accumulation in the intersection area of the hat stringer bottom R angle and the skin during the curing of the stiffened panel can be avoided.

[0003] In the existing twist strip manufacturing method, one manufacturing method is to cut a plurality of carbon fiber sheets according to the required shape, and then to press, bond and combine the plurality of cut carbon fiber sheets to obtain the twist strip. However, this manufacturing method is complicated and has low production efficiency. Another manufacturing method is to use 3D printing thermoplastic twist strip (such as PEKK material) to directly melt and deposit into shape. Although this manufacturing method improves the production efficiency, the production cost is high and cannot be popularized.

[0004] Therefore, there is an urgent need for a twist strip manufacturing method that takes into account the production efficiency and production cost. SUMMARY

[0005] The purpose of the present application is to provide a hat stringer bottom twist strip manufacturing method, which is not only simple to operate, but also has high production efficiency and low production cost.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A hat stringer bottom twist strip manufacturing method, the twist strip is used to fill the triangular area between the R angle of the hat stringer bottom and the skin, the hat stringer bottom twist strip manufacturing method comprises the following steps:

[0008] S100: According to the shape of the triangular area, the cross-sectional shape of the twist strip is constructed, and the cross-sectional area S0 of the twist strip is calculated;

[0009] S200: According to the cross-sectional area S0 of the twist strip obtained in step S100, the cross-sectional area S1 of the original piece is calculated, wherein S1 = K*S0, K > 1;

[0010] S300: According to the cross-sectional area S1 of the original piece obtained in step S200, the original piece is manufactured;

[0011] S400: The original piece is extruded into the twist strip matching the shape of the triangular area by a mold.

[0012] Optionally, in step S100, the cross section of the twist strip comprises a long string section, a skin section and a structure section, the long string section is attached to the R angle of the bottom of the hat-shaped long string, the skin section is attached to the inner contour surface of the skin, and the structure section is connected to the long string section and the skin section respectively.

[0013] Optionally, the structure section is an arc section, the arc section is recessed towards the direction where the hat-shaped long string intersects with the skin, and the two ends of the arc section are tangent to the hat-shaped long string and the skin respectively.

[0014] Optionally, in step S200, the K value is 1.1-1.5.

[0015] Optionally, in step S300, the manufacturing of the original piece specifically comprises: sandwiching a rigid layer between two plastic layers and fixing to form the original piece.

[0016] Optionally, the rigid layer is a carbon fiber layer, and the plastic layer is a resin adhesive film layer.

[0017] Optionally, the length of the original piece is the same as the length of the triangular area.

[0018] Optionally, in step S400, the mold is provided with a forming groove, and the shape of the forming groove is the same as the cross-sectional shape of the twist strip.

[0019] Optionally, the mold comprises an upper module, a round bar and a lower module, and the forming groove is surrounded by the upper module, the round bar and the lower module.

[0020] The application also provides a twist strip, which is manufactured by the hat-shaped long string bottom twist strip manufacturing method.

[0021] The application has the following advantages:

[0022] The hat-shaped long string bottom twist strip manufacturing method provided by the application comprises the following steps: designing the cross-sectional shape and size of a twist strip, obtaining the cross-sectional size of an original piece, and extruding the original piece into a twist strip by a mold.

[0023] The twist strip manufactured by the method has a smaller size and better fitting property, and can effectively fill and support the triangular area formed between the R angle of the bottom of the hat-shaped long string and the skin. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1is a flow chart of the hat-shaped stringer bottom twist strip manufacturing method provided by the embodiment of the present application;

[0025] Figure 2 is a sectional view of the hat-shaped stringer, skin and twist strip provided by the embodiment of the present application;

[0026] Figure 3 is a sectional view of the hat-shaped stringer and twist strip provided by the embodiment of the present application;

[0027] Figure 4 is Figure 2 is a local enlarged view at A in the middle;

[0028] Figure 5 is a structural schematic view of the twist strip and original piece provided by the embodiment of the present application;

[0029] Figure 6 is a structural schematic view of the original piece provided by the embodiment of the present application;

[0030] Figure 7 is a front view of the mold provided by the embodiment of the present application;

[0031] Figure 8 is a sectional view of the hat-shaped stringer, skin, twist strip and core mold provided by the embodiment of the present application.

[0032] in the figure:

[0033] 1, hat-shaped stringer; 2, skin;

[0034] 3, twist strip; 31, stringer section; 32, skin section; 33, structure section;

[0035] 4, original piece; 41, rigid layer; 42, plastic layer;

[0036] 5, mold; 51, upper mold block; 52, round bar; 53, lower mold block;

[0037] 6, forming groove; 7, core mold. DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0039] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] As shown in Figure 1 The present embodiment provides a hat-shaped stringer bottom twist strip manufacturing method, the twist strip 3 is used to fill the triangular area between the hat-shaped stringer 1 bottom R angle and the skin 2, the hat-shaped stringer bottom twist strip manufacturing method comprises the following steps:

[0043] S100: According to the shape of the triangular area, the cross-sectional shape of the twist strip 3 is constructed, and the cross-sectional area S0 of the twist strip 3 is calculated;

[0044] S200: According to the cross-sectional area S0 of the twist strip 3 obtained in step S100, the cross-sectional area S1 of the original piece 4 is calculated, wherein S1 = K*S0, K>1;

[0045] S300: According to the cross-sectional area S1 of the original piece 4 obtained in step S200, the original piece 4 is made;

[0046] S400: The original piece 4 is extruded into a twist strip 3 matched with the shape of the triangular area through a mold 5.

[0047] The cross-sectional shape and size of the twist strip 3 are designed first, and then the original piece 4 is extruded into the twist strip 3 through the mold 5. Compared with the manufacturing method of the twist strip in the prior art, the hat-shaped stringer bottom twist strip manufacturing method is not only simpler to operate, but also has higher manufacturing efficiency and lower production cost.

[0048] As shown in Figure 2 , Figure 3 , at the connection between the hat-shaped stringer 1 and the skin 2, a triangular area is formed between the hat-shaped stringer 1 bottom R angle and the skin 2. In order to enable the twist strip 3 to effectively fill and support the triangular area, when the cross-sectional shape of the twist strip 3 is constructed, the cross-sectional shape of the twist strip 3 needs to be matched with the cross-sectional shape of the triangular area. Therefore, as shown in Figure 4 , the cross section of the twist strip 3 includes a stringer segment 31, a skin segment 32 and a construction segment 33, wherein the stringer segment 31 is attached to the bottom R angle of the hat-shaped stringer 1, the skin segment 32 is attached to the inner contour surface of the skin 2, and the construction segment 33 is connected to the stringer segment 31 and the skin segment 32 respectively. By providing the stringer segment 31 and the skin segment 32, the twist strip 3 can perfectly fill the triangular area formed between the hat-shaped stringer 1 bottom R angle and the skin 2, and the construction segment 33 is connected to the stringer segment 31 and the skin segment 32 respectively, forming a cross-sectional shape similar to a triangle, so that the twist strip 3 can form a stable support structure.

[0049] Optionally, as shown in Figure 4 , the construction segment 33 in this embodiment is an arc segment, which is recessed towards the direction where the hat-shaped stringer 1 and the skin 2 intersect, and the two ends of the arc segment are tangent to the hat-shaped stringer 1 and the skin 2 respectively. Through this setting, while ensuring that the twist strip 3 can effectively fill and support the triangular area formed between the hat-shaped stringer 1 bottom R angle and the skin 2, the cross-sectional size of the twist strip 3 is reduced, thereby reducing the material required for manufacturing the twist strip 3 and reducing the production cost.

[0050] Of course, it can be understood that in some other embodiments, the construction segment 33 can also be set as a straight line segment or other shapes according to actual design needs, which is not limited here.

[0051] It should be noted that after the cross section of the twist strip 3 is constructed, the cross-sectional area S0 of the twist strip 3 can be calculated by the segmentation method, the filling method or the integral method. The segmentation method, the filling method or the integral method are all prior art, which will not be repeated here.

[0052] After the cross-sectional shape of the twist strip 3 is determined and the cross-sectional area S0 of the twist strip 3 is calculated, the cross-sectional area S1 of the original piece 4 is calculated according to the cross-sectional area S0 of the twist strip 3. As shown in Figure 5As shown, in order to ensure that the extruded twist bar 3 can be effectively filled and supported, the cross-sectional area S1 of the original piece 4 is greater than the cross-sectional area S0 of the twist bar 3.

[0053] Optionally, in step S200, the value of K is 1.1-1.5. By setting the value of K to be between 1.1-1.5, the cross-sectional area S1 of the original piece 4 will not be too large to cause material waste, nor will it be too small to cause the extruded twist bar 3 to fail to effectively fill and support. It can be understood that the value of K can be 1.1, 1.2, 1.3, 1.4 or 1.5. It can also be understood that the value of K can also be other values within the range of 1.1-1.5.

[0054] After calculating the cross-sectional area S1 of the original piece 4, the original piece 4 is manufactured according to the calculation result. Specifically, in step S300, manufacturing the original piece 4 specifically includes: sandwiching the rigid layer 41 between the two moldable layers 42 and fixing it to form the original piece 4. As shown, Figure 6 As shown, the original piece 4 includes a rigid layer 41 and two moldable layers 42, and the rigid layer 41 is sandwiched between the two moldable layers 42. By providing moldable layers 42 on the outside of the original piece 4, the original piece 4 is easily formed during extrusion, and the twist bar 3 has good adhesion between the hat stringer 1 and the skin 2. By providing a rigid layer 41 between the moldable layers 42, the twist bar 3 can have a certain rigidity, thereby having good support.

[0055] Optionally, in the present embodiment, the rigid layer 41 is a carbon fiber layer, and the two moldable layers 42 are resin adhesive film layers. Carbon fiber has the characteristics of lightweight and high strength, which can reduce the overall weight of the twist bar 3 while ensuring that the twist bar 3 has a certain rigidity. The resin adhesive film has the characteristics of rapid curing and self-adhesion, which not only facilitates the rapid formation of the twist bar 3, but also has good adhesion.

[0056] Of course, it can be understood that in some other embodiments, the materials of the rigid layer 41 and the moldable layer 42 are not limited to carbon fiber and resin adhesive film, and other materials can be used according to actual needs, for example, the rigid layer 41 can be made of glass fiber, titanium alloy, etc., and the moldable layer 42 can be made of polyurethane, epoxy adhesive film, etc., as long as the moldable layer 42 is compatible with the resin matrix on the skin 2 and the hat stringer 1.

[0057] It should be noted that the cross-section of the original piece 4 only needs to meet the size requirement, and the shape of the cross-section of the original piece 4 can be set according to actual needs, which is not limited here.

[0058] Further, the length of the original piece 4 is the same as the length of the triangular area formed between the R angle of the bottom of the hat-shaped longeron 1 and the skin 2. Through this arrangement, it is possible to avoid wasting material when the length of the original piece 4 is too long, and to avoid affecting the supporting effect of the twist strip 3 when the length is too short.

[0059] After the original piece 4 is completed, the original piece 4 is extruded into the twist strip 3 by the mold 5. As shown in Figure 7 , the mold 5 is provided with a forming groove 6, and the shape of the forming groove 6 is the same as the cross-sectional shape of the twist strip 3. Further, during extrusion molding, the original piece 4 is first placed in the forming groove 6, and then the original piece 4 in the forming groove 6 is extruded by the mold 5, so that the original piece 4 is extruded into the shape of the forming groove 6, and thus the twist strip 3 is obtained. Compared with the prior art, this molding method is not only simpler to operate, but also more efficient.

[0060] Further, as shown in Figure 2 , Figure 3 , one hat-shaped longeron 1 corresponds to two twist strips 3, and correspondingly, as shown in Figure 7 , the mold 5 can be provided with two forming grooves 6, and thus two twist strips 3 can be simultaneously pressed out by the mold 5, which not only has higher production efficiency, but also has better consistency of the two twist strips 3 for the same hat-shaped longeron 1, so that better filling and supporting effects can be achieved.

[0061] Optionally, as shown in Figure 7 , the mold 5 in the embodiment includes an upper module 51, a round bar 52, and a lower module 53, and the forming groove 6 is surrounded by the upper module 51, the round bar 52, and the lower module 53. The lower module 53 is substantially a square block, and a receiving groove is formed on one end face of the lower module 53. The upper side portions of the two side walls of the receiving groove are arc-shaped surfaces, and the lower side portions are vertical surfaces. The round bar 52 is placed in the receiving groove, and the cylindrical surface of the round bar 52 is tangent to the intersection of the arc-shaped surfaces and the vertical surfaces. The upper module 51 is a square block, which is placed on the lower module 53, and the cylindrical surface of the round bar 52 is tangent to the lower end face of the upper module 51. By using the lower end face of the upper module 51 to simulate the skin segment 32, the arc-shaped surface on the lower module 53 to simulate the longeron segment 31, and the cylindrical surface of the round bar 52 between the lower end face of the upper module 51 and the arc-shaped surface of the lower module 53 to simulate the construction segment 33, the upper module 51, the round bar 52, and the lower module 53 surround the forming groove 6 which has the same cross-sectional shape as the twist strip 3.

[0062] When extruding the original part 4, the original part 4 is first placed in the gap formed between the curved surface of the lower module 53 and the round rod 52. The upper module 51 is then placed above the lower module 53 and in contact with the original part 4. The upper module 51 is then pressed downward until it contacts the lower module 53, thereby extruding the original part 4 into a twisted strip 3. At the same time, because the upper module 51, the round rod 52, and the lower module 53 in this embodiment can simultaneously enclose two forming grooves 6, the original part 4 can be placed in both forming grooves 6, thereby simultaneously extruding two twisted strips 3.

[0063] The mold 5 adopts a modular design, and when producing twist strips 3 with different cross-sectional sizes and shapes, the required forming grooves 6 can be quickly formed by matching different modules, thereby reducing the production cost of the mold 5.

[0064] Of course, it is understandable that in some other embodiments, the mold 5 can also be composed of other structures, such as directly designing the round rod 52 and the lower module 53 as an integrated structure, as long as the original part 4 can be extruded into a twisted strip 3, there is no limitation here.

[0065] The manufacturing method of the bottom twist strip of the hat-shaped long truss provided in this embodiment is different from the prior art method of cutting multiple carbon fiber sheets according to the required shape and then pressing and bonding the multiple cut carbon fiber sheets to obtain the twist strip. The manufacturing method of the bottom twist strip of the hat-shaped long truss provided in the present invention first constructs the cross-sectional shape and cross-sectional size of the twist strip 3, and then obtains the cross-sectional size of the original part 4, and then extrude the original part 4 into the twist strip 3 through the mold 5. Not only is the operation simpler, but the production efficiency is higher and the production cost is lower.

[0066] The present invention also provides a twist strip 3, which is made by the above-mentioned method of manufacturing the bottom twist strip of the hat-shaped long stringer. The twist strip 3 made by this method is smaller in size and has better fit, and can effectively fill and support the triangular area formed between the bottom R corner of the hat-shaped long stringer 1 and the skin 2.

[0067] After the twist strip 3 is made, its use is as follows: Figure 8 As shown, a twist strip 3 is placed in the triangular area formed between the bottom R corner of the hat-shaped stringer 1 and the skin 2. The twist strip 3, the hat-shaped stringer 1, and the skin 2 are cured together by increasing temperature and pressure. During the curing process, the inner cavity of the hat-shaped stringer 1 is filled and pressurized through a core mold 7, causing the twist strip 3 to deform, solidify, and tightly fit the stringer structure and skin 2 in this area. After curing is complete, the core mold 7 is removed. This achieves a more lightweight and efficient filling of the cross-sectional gap between the bottom of the stringer and the skin 2 of the hat-shaped stringer composite reinforced wall panel.

[0068] Exemplarily, in one specific embodiment, the hat-shaped stringer bottom twist strip manufacturing method specifically comprises the following steps:

[0069] Step S100: as shown in the figure, Figure 4 and Figure 5 , the radius of the hat-shaped stringer 1 lower bottom R angle is set to 10 mm, and then the stringer segment 31 of the twist strip 3 is a circular arc segment with a radius of 10 mm. A point on the hat-shaped stringer 1 is taken as a tangent, the tangent is 0.7 mm long, and a circular arc with a radius of 3 mm is drawn. The circular arc and the tangent point with the skin 2 are also tangent, that is, the configuration segment 33 is a circular arc with a radius of 3 mm, and the distance between the tangent point of the skin segment 32 and the intersection point of the hat-shaped stringer 1 and the skin 2 is 10.3 mm, that is, the skin segment 32 is a line segment of 10.3 mm. The triangular area surrounded by the above-mentioned stringer segment 31, skin segment 32 and configuration segment 33 is the cross section of the twist strip 3, and the cross section area S0 is 11.5 mm 2 ;

[0070] Step S200: according to the cross section area S0 of the twist strip 3 in step S100, multiply the magnification factor k=1.1 to calculate the cross section area S1 of the original piece 4, that is, S1=1.1*11.5=12.65 mm 2 ;

[0071] Step S300: according to the cross section area S1 of the original piece 4 obtained in step S200, and as shown in the figure, Figure 6 , using two layers of resin film and one layer of carbon fiber as the material of the original piece 4, and pressing it into a long strip with a rectangular cross section and an area of 12.65 mm 2 ;

[0072] Step S400: as shown in the figure, Figure 7 , the original piece 4 made in step S300 is placed in the forming groove 6 of the mold 5, and the original piece 4 is extruded into the twist strip 3 matching the shape of the triangular area in step S100.

[0073] After the twist strip 3 is made, as shown in the figure, Figure 8 , it is placed in the area between the hat-shaped stringer 1 bottom and the core mold 7 gap, and then cured.

[0074] Obviously, the above-mentioned embodiments of the present application are only examples for the purpose of clear illustration, and are not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method for manufacturing a bottom twist strip of a hat-shaped long stringer, wherein the twist strip (3) is used to fill the triangular area between the bottom R angle of the hat-shaped long stringer (1) and the skin (2), characterized in that: The method for manufacturing the bottom twister strip of the hat-shaped long stringer comprises the following steps: S100: constructing the cross-sectional shape of the twist bar (3) according to the shape of the triangular area, and calculating the cross-sectional area S0 of the twist bar (3); S200: Calculate the cross-sectional area S1 of the original component (4) based on the cross-sectional area S0 of the twisted strip (3) obtained in step S100, wherein S1=K*S0, K>1; S300: manufacturing the original component (4) according to the cross-sectional area S1 of the original component (4) obtained in step S200; S400: Extruding the original component (4) into the twisted strip (3) matching the shape of the triangular area through a mold (5).

2. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 1, characterized in that: In step S100, the cross section of the twisted strip (3) includes a long stringer section (31), a skin section (32) and a structural section (33), the long stringer section (31) is fitted with the bottom R angle of the hat-shaped long stringer (1), the skin section (32) is fitted with the inner contour surface of the skin (2), and the structural section (33) is connected to the long stringer section (31) and the skin section (32) respectively.

3. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 2, characterized in that: The structural section (33) is an arc-shaped section, which is concave toward the direction where the hat-shaped long stringer (1) and the skin (2) intersect, and the two ends of the arc-shaped section are tangent to the hat-shaped long stringer (1) and the skin (2) respectively.

4. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 1, characterized in that: In step S200, the K value is 1.1-1.

5.

5. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 1, characterized in that: In step S300, making the original (4) specifically includes: The rigid layer (41) is sandwiched between two plastic layers (42) and fixed to form the original component (4).

6. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 5, characterized in that: The rigid layer is a carbon fiber layer, and the plastic layer is a resin film layer.

7. The method for manufacturing the bottom twister of the hat-shaped long stringer according to claim 1, characterized in that: The length of the original (4) is the same as the length of the triangular area.

8. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 1, characterized in that: In step S400, the mold (5) is provided with a molding groove (6), and the shape of the molding groove (6) is the same as the cross-sectional shape of the twist strip (3).

9. The method for manufacturing the bottom twister strip of the hat-shaped long stringer according to claim 8, characterized in that: The mold (5) comprises an upper module (51), a round rod (52) and a lower module (53), and the molding groove (6) is surrounded by the upper module (51), the round rod (52) and the lower module (53).

10. A twist strip, characterized in that: The twist strip is manufactured by the method for manufacturing the bottom twist strip of the hat-shaped long stringer according to any one of claims 1 to 9.

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