Composite material rhodomyrtus tomentosa strip forming device

Abstract

The utility model belongs to the technical field of composite material rhodomyrtus tomentosa strip manufacturing, and discloses a composite material rhodomyrtus tomentosa strip forming device. The composite material rhodomyrtus tomentosa strip forming device comprises a first mold, a second mold and a shaping rod. A first joint surface on the first mold and a second joint surface on the second mold can be jointed, and when the first joint surface and the second joint surface are jointed, a first forming surface on the first joint surface, a second forming surface on the second joint surface and the cambered surface of the shaping rod can define a shaping channel in a rhodomyrtus tomentosa strip shape; and meanwhile, non-adhesive isolation surfaces are arranged on the three surfaces which are encircled to form the shaping channel. The shaping rod is matched with the second mold to prepare the rhodomyrtus tomentosa strips, so that a plurality of shaping surfaces are prevented from being processed on the second mold at the same time, and the processing difficulty of the second mold is reduced; meanwhile, isolation surfaces are arranged on the first shaping surface, the second shaping surface and the arc surface, so that demolding of the rhodomyrtus tomentosa strips is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material wick strip manufacturing, in particular to a forming device for composite material wick strips. Background Art

[0002] Composite materials are increasingly widely used in the aviation field due to their excellent properties such as high strength-to-weight ratio, light weight, fatigue resistance, corrosion resistance, and their forming characteristics such as easy integral curing. Composite material stringers are common components in aircraft. Inevitably, triangular voids will be generated during their manufacturing process. The triangular voids in the stringer structure must be filled with composite material wick strips to ensure the integrity and sealing of the structure, and enhance the overall strength and stiffness of the structure.

[0003] In the prior art, the forming method of composite material wick strips is usually to first roll a sheet of composite material prepreg into a round strip according to the cross-sectional size of the wick strip, and then press the round strip of composite material prepreg into the shape required for the wick strip through a special mold. However, because the cross-sectional shape of the wick strip is complex, the corresponding shaping surface of the mold is not easy to process; at the same time, due to the resin viscosity of the composite material prepreg itself, the wick strip will adhere to the mold under pressure during pressing, making it difficult to demold. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a forming device for composite material wick strips to reduce the processing difficulty of the forming mold; at the same time, it is convenient for the demolding of the formed wick strip.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A forming device for composite material wick strips, which includes:

[0007] A first mold, the first mold includes a first joint surface, and the first joint surface includes a first shaping surface for forming the top surface of the wick strip;

[0008] A second mold, the second mold includes a second joint surface, the second joint surface can be joined with the first joint surface, the second joint surface includes a positioning groove, and the side wall of the positioning groove includes a second shaping surface for forming one side surface of the wick strip;

[0009] A shaping rod, the positioning groove is used to place the shaping rod, the shaping rod includes an arc surface for forming the other side surface of the wick strip. When the first joint surface and the second joint surface are joined, the first shaping surface, the second shaping surface, and the arc surface are in contact with each other pairwise and enclose a shaping channel in the shape of a wick strip, and when enclosing, non-adhesive isolation surfaces are provided on the first shaping surface, the second shaping surface, and the arc surface.

[0010] Preferably, the cross-sectional shapes of the shaping rod and the positioning groove are both axisymmetric figures. The shaping rod abuts against the two side walls of the positioning groove. The surface of the shaping rod away from the positioning groove on the side where it abuts against the two side walls is an arc surface. When the first joint surface and the second joint surface are joined, the apex of the arc surface abuts against the first shaping surface, and a shaping channel is enclosed on each side of the shaping rod.

[0011] Preferably, the apex of the shaping rod is coplanar with the notch of the positioning groove, and the first shaping surface is a plane.

[0012] Preferably, the second joint surface includes at least two of the positioning grooves.

[0013] Preferably, the shaping rod is made of a material that is self-releasing from the composite material prepreg, or the shaping rod is a metal rod with a release agent layer coated on its surface.

[0014] Preferably, the non-adhesive isolation surface provided on the first shaping surface and the second shaping surface is an isolation film.

[0015] Preferably, the area of the isolation film is greater than or equal to the areas of the first joint surface and the second joint surface.

[0016] Preferably, both the first mold and the second mold are metal parts.

[0017] Preferably, a limiting groove is provided on the second mold, and a limiting protrusion is provided on the first mold. The limiting protrusion abuts against the limiting groove for limiting. The bottom of the limiting groove forms the second joint surface, and the convex surface of the limiting protrusion forms the first joint surface.

[0018] Advantageous effects:

[0019] The composite material wick strip forming device provided by the present utility model includes a first mold, a second mold, and a shaping rod. The first shaping surface of the first mold, the second shaping surface of the second mold, and the arc surface of the shaping rod jointly enclose a shaping channel in the shape of a wick strip. Using the shaping rod in cooperation with the second mold to prepare the wick strip avoids simultaneously machining multiple shaping surfaces on the second mold, reducing the machining difficulty of the second mold; at the same time, isolation surfaces are provided on the first shaping surface, the second shaping surface, and the arc surface, facilitating the demolding of the wick strip.

[0020] The composite material wick strip preparation method provided by the present utility model uses the above-mentioned composite material wick strip forming device. By disassembling and assembling the shaping rod and setting the isolation surface, the wick strip can be conveniently demolded after being pressed and formed, and the wick strip will not be bent, deformed, etc. due to adhesion to the shaping surface during the demolding process. Description of the drawings

[0021] Figure 1 It is a schematic diagram when the first mold and the second mold of the composite material wick strip forming device provided by the present utility model are not joined;

[0022] Figure 2 It is a schematic diagram of the composite material wick strip forming device provided by the present utility model with an isolation surface provided on the second shaping surface;

[0023] Figure 3 It is a schematic diagram of the composite material wick strip forming device provided by the present utility model with an isolation surface provided on the first shaping surface;

[0024] Figure 4 It is a schematic diagram of the state when the composite material wick strip forming device provided by the present utility model produces a wick strip;

[0025] Figure 5 It is a schematic diagram of the wick strip produced by the composite material wick strip forming device provided by the present utility model;

[0026] Figure 6 It is a schematic diagram when the wick strip produced by the composite material wick strip forming device provided by the present utility model is applied;

[0027] Figure 7 It is a schematic process diagram when preparing a wick strip using the composite material wick strip forming device provided by the present utility model.

[0028] In the figure: 1 - second mold; 2 - shaping rod; 3 - first mold; 41 - first isolation film; 42 - second isolation film; 5 - composite material prepreg blank; 6 - wick strip; 61 - first surface; 62 - second surface; 63 - third surface; 7 - stringer; 8 - skin. Detailed implementation manners

[0029] The following further details the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "joined", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] As Figures 1-6 shown, this embodiment provides a composite material wick strip forming device. The composite material wick strip forming device includes a first mold 3, a second mold 1 and a shaping rod 2. The first mold 3 includes a first joint surface, and the first joint surface includes a first shaping surface for shaping the top surface of the wick strip 6. The second mold 1 includes a second joint surface, and the second joint surface can be joined with the first joint surface. At the same time, the second joint surface of the second mold 1 includes a positioning groove, and the side wall of the positioning groove includes a second shaping surface for shaping one side surface of the wick strip 6. The positioning groove is used for placing the shaping rod 2. The shaping rod 2 includes an arc surface for shaping the other side surface of the wick strip 6. When the first joint surface is joined with the second joint surface, the first shaping surface, the second shaping surface and the arc surface are in contact with each other pairwise and enclose a shaping channel in the shape of the wick strip 6. At the same time, when enclosing, non-sticking isolation surfaces are provided on the first shaping surface, the second shaping surface and the arc surface.

[0034] Specifically, the wick strip 6 includes a plane and two curved surfaces, and the plane of the wick strip 6 is used as the top surface. Further, the arc surface on the shaping rod 2 is a circular arc surface. Further, the first mold 3 is an upper mold, the first joint surface is located on the lower surface of the upper mold, the second mold 1 is a lower mold, the second joint surface is located on the upper surface of the lower mold, and when the first joint surface is joined with the second joint surface, the upper mold presses on the lower mold. Further, the positioning groove located on the upper surface of the lower mold can hold the shaping rod 2 more stably. Compared with the positioning groove provided in a vertically or obliquely placed mold, the shaping rod 2 is not likely to slide out of the positioning groove.

[0035] Furthermore, the first shaping surface, the second shaping surface, and the arc surface are in contact with each other pairwise to form a shaping channel in the shape of a wick strip 6, which can press the composite prepreg disposed between the two molds into the wick strip 6. At this time, the arc surface of the shaping rod 2 can participate in the shaping of the wick strip 6, avoiding the need to set multiple complex shaping surfaces on the same mold, thereby reducing the production difficulty of the mold. Moreover, non-adhesive isolation surfaces are provided on the first shaping surface, the second shaping surface, and the arc surface, enabling the wick strip 6 not to adhere to the surface of the wick strip shaping device due to the resin viscosity of the composite material itself after shaping, preventing bending and deformation caused by adhesion, improving the convenience of demolding the wick strip 6, and thus ensuring the quality of the wick strip 6.

[0036] Specifically, the cross-sectional shapes of the shaping rod 2 and the positioning groove are both axisymmetric figures. The shaping rod 2 is in contact with the two side walls of the positioning groove. The surface of the shaping rod 2 away from the positioning groove on the side where it is in contact with the two side walls is an arc surface. When the first joint surface and the second joint surface are joined, the arc top of the arc surface is in contact with the first shaping surface, and a shaping channel is enclosed on each side of the shaping rod 2. At this time, the arc surfaces on both sides of the shaping rod 2 can respectively enclose a shaping channel with the first mold 3 and the second mold 1, that is, setting one shaping rod 2 can produce two wick strips 6 simultaneously.

[0037] Furthermore, the arc top of the shaping rod 2 is coplanar with the notch of the positioning groove, and the first shaping surface is a plane. Further, when the shaping rod 2 is placed in the positioning groove, the arc top of the shaping rod 2 is coplanar with the highest point of the positioning groove, and the highest point of the positioning groove is the highest point of the second shaping surface. The first joint surface is a plane, and the first shaping surface provided on the first joint surface is also a plane. When the two molds are joined through the two joint surfaces, the first shaping surface can be simultaneously joined with the arc top of the arc surface and the highest point of the second shaping surface to enclose the shaping channel. The first shaping surface set in this way does not require complex processing and only needs to ensure that it is a plane to complete the function of enclosing the shaping channel.

[0038] Furthermore, at least two positioning grooves are provided on the second joint surface, and at least two shaping rods 2 are correspondingly provided between the first mold 3 and the second mold 1, that is, the number of shaping channels twice that of the shaping rods 2 can be formed simultaneously, and then the wick strips 6 with the same number as the shaping channels can be produced simultaneously.

[0039] Furthermore, the shaping rod 2 is a round rod, and the diameter length of the round rod is the same as the depth of the positioning groove. At this time, the first joint surface being a plane can achieve the enclosure of the shaping channel. The regularly shaped cylindrical shaping rod 2 is easier to process, further reducing the production difficulty of the composite wick strip shaping device. In some other embodiments, one end of the shaping rod 2 away from the bottom of the positioning groove can be an arc surface, and the end close to the bottom of the positioning groove can be a plane, and it is clamped with the positioning groove, further increasing the stability of the shaping rod 2 when placed.

[0040] Specifically, the shaping rod 2 is made of a material that is self-releasing from the composite prepreg or a release agent layer is coated on the surface of the shaping rod 2. Coating the release agent on the surface of the shaping rod 2 can ensure that the twist strip 6 will not adhere to the arc surface of the shaping rod 2 during demolding. At this time, the shaping rod can be made of a metal material to have good strength and thermal conductivity; the shaping rod 2 can also be made of polytetrafluoroethylene plastic or other materials that are self-releasing from the composite prepreg. At this time, the surface of the shaping rod 2 is not coated with a release agent layer and does not adhere to the twist strip 6, reducing the operation steps during the production of the twist strip 6.

[0041] Specifically, the non-sticky isolation surface provided on the first shaping surface and the second shaping surface is an isolation film. The isolation film is covered on the first shaping surface and the second shaping surface. At this time, there will be an isolation film between the twist strip 6 and the first shaping surface and the second shaping surface. Therefore, the twist strip 6 will not be in direct contact with the two. This setting makes the twist strip 6 not adhere to the first shaping surface and the second shaping surface, ensuring the convenience during its demolding.

[0042] Further, the area of the isolation film is greater than or equal to the area of the first joint surface and the area of the second joint surface to ensure that when the first mold 3 and the second mold 1 are joined, the isolation film can completely cover the first joint surface and the second joint surface, avoiding direct contact between the surface enclosing the shaping channel and the composite twist strip.

[0043] Specifically, both the first mold 3 and the second mold 1 are made of metal materials, having good structural strength and thermal conductivity, which is convenient for pressing the composite material between the two molds and heating it.

[0044] Specifically, a limiting groove is provided on the second joint surface of the second mold 1, and a limiting protrusion is provided on the first mold 3. The limiting protrusion abuts against the limiting groove for limiting, and the bottom of the limiting groove forms the second joint surface, and the convex surface of the limiting protrusion forms the first joint surface. Specifically, when the limiting protrusion is engaged with the limiting groove, relative sliding between the two molds after joining can be avoided, affecting the shaping of the twist strip 6.

[0045] Meanwhile, as Figure 7 shown, in this embodiment, the specific steps of the method for preparing the composite twist strip 6 using the above-mentioned composite twist strip forming device are as follows:

[0046] S1: Place the shaping rod 2 into the positioning groove;

[0047] S2: Place the composite prepreg blank 5 between the second shaping surface and the arc surface;

[0048] S3: Install the first mold 3 to make the first joint surface and the second joint surface join;

[0049] S4: Heat and press the composite material twister bar forming device so that the composite material prepreg blank 5 is pressed into the required shape of the twister bar 6;

[0050] S5: Disassemble the first mold 3 of the composite material twister bar forming device, and while taking out the shaping rod 2 from the positioning groove, demold the twister bar 6.

[0051] Further, S1 is specifically: Place the first isolation film 41 on the second joint surface, and then use the shaping rod 2 made of the self-releasing material of the composite material prepreg or the metal shaping rod 2 with a release agent layer coated on the surface to press the first isolation film 41 into the positioning groove, and use the first isolation film 41 as the isolation surface of the second shaping surface.

[0052] S2 is specifically: Roll the sheet-shaped composite material prepreg into a circular bar of the composite material prepreg and use it as the composite material prepreg blank 5, and place the circular bar of the composite material prepreg between the second shaping surface and the arc surface;

[0053] S3 is specifically: Place the second isolation film 42 on the side of the composite material prepreg blank 5 away from the second mold 1, then join the first joint surface and the second joint surface, and use the second isolation film 42 as the isolation surface of the first shaping surface. In some other embodiments, the second isolation film 42 can also be first attached to the first joint surface and then become the isolation surface of the first shaping surface when the first joint surface and the second joint surface are joined.

[0054] Specifically, the first isolation film 41 and the second isolation film 42 set by the above steps can realize the smooth demolding of the twister bar 6 from the surfaces of the first mold 3 and the second mold 1. The shaping rod 2 is made of the self-releasing material of the prepreg or the shaping rod 2 is a metal rod with a release agent layer coated on the surface, and the twister bar 6 can also be smoothly demolded from the surface of the shaping rod.

[0055] Further, the first mold 3 and the second mold 1 are respectively the upper mold and the lower mold, the shaping rod 2 is a round rod, and the isolation surface of the first shaping surface and the second shaping surface is the isolation film. Then the above specific steps are:

[0056] S10: Place a layer of the first isolation film 41 between the round rod and the lower mold, and use the round rod to press the isolation film into the lower mold;

[0057] S20: Roll the sheet-shaped composite material prepreg into a round bar with an appropriate volume according to needs, and place it between the second shaping surface and the arc surface;

[0058] S30: Place a layer of the second isolation film 42 above the circular bar of the composite material prepreg, and install the upper mold;

[0059] S40: Heat and press according to needs, and the circular bar of the composite material prepreg is pressed into the required shape of the twister bar 6;

[0060] S50: Remove the upper mold, take out the round bar from the lower mold, and simultaneously demold the wick strip 6.

[0061] Specifically, the formed wick strip 6 has three surfaces, a first surface 61, a second surface 62, and a third surface 63. The first surface 61 and the second surface 62 are in contact with the separator film, and the third surface 63 is in contact with the round bar. When the round bar material is metal, a release agent is brushed on its surface, or the round bar itself is made of a self-releasing material such as polytetrafluoroethylene plastic or other composite material prepregs. Therefore, the wick strip 6 will not adhere to the composite wick strip forming device during demolding.

[0062] As Figure 6 shown, further, the demolded wick strip 6 can be combined with other parts of the composite part. The first surface 61 of the wick strip 6 is in contact with the stringer 7, and the second surface 62 is in contact with the skin 8. These two surfaces are in contact with the separator film during the forming of the wick strip 6 and will not affect the composite wick strip 6. The third surface 63 is in contact with a metal round bar with a release agent brushed on its surface or a round bar made of a self-releasing material such as polytetrafluoroethylene plastic or other composite material prepregs during the forming of the wick strip 6. In the example usage scenario, if the third surface 63 of the wick strip 6 is in contact with a metal round bar with a release agent brushed on it during production, the release agent is likely to remain on the surface of the third surface 63. Therefore, the third surface 63 does not contact other composite parts during subsequent combination to avoid affecting the composite parts. If the third surface 63 of the wick strip 6 is in contact with a round bar made of a self-releasing prepreg material during production, the third surface 63 can contact other composite parts subsequently, and thus all three surfaces of the wick strip 6 are in contact with the composite part. That is, the composite wick strip forming device and its preparation method provided in this embodiment ensure the structural characteristics of the wick strip 6 after demolding.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A composite material twist strip forming device, characterized in that: include: A first mold (3), the first mold (3) comprising a first joint surface, the first joint surface comprising a first shaping surface for shaping the top surface of the twist strip; A second mold (1), the second mold (1) comprising a second joint surface, the second joint surface being capable of being joined to the first joint surface, the second joint surface comprising a positioning groove, the side wall of the positioning groove comprising a second shaping surface for shaping one side surface of the twist strip; A shaping rod (2), wherein the positioning groove is used to place the shaping rod (2), and the shaping rod (2) comprises an arc surface for shaping the other side surface of the twist strip, and when the first joint surface is joined with the second joint surface, the first shaping surface, the second shaping surface and the arc surface abut against each other in pairs and enclose a shaping channel in the shape of the twist strip, and when enclosed, the first shaping surface, the second shaping surface and the arc surface are all provided with a non-adhesive isolation surface.

2. The composite material twist strip forming device according to claim 1, characterized in that: The cross-sectional shapes of the shaping rod (2) and the positioning groove are both axially symmetrical figures. The shaping rod (2) abuts against the two side walls of the positioning groove. The surface of the side away from the positioning groove where the shaping rod (2) abuts against the two side walls is an arc surface. When the first joint surface is engaged with the second joint surface, the top of the arc surface abuts against the first shaping surface. The two sides of the shaping rod (2) each enclose a shaping channel.

3. The composite material twist strip forming device according to claim 2, characterized in that: The arc top of the shaping rod (2) is coplanar with the notch of the positioning groove, and the first shaping surface is a plane.

4. The composite material twist strip forming device according to claim 1, characterized in that: The second joint surface includes at least two positioning grooves.

5. The composite material twist strip forming device according to claim 1, characterized in that: The shaping rod (2) is made of a material that is self-detachable from the composite material prepreg; or, the shaping rod (2) is a metal rod with a release agent layer coated on the surface.

6. The composite material twist strip forming device according to claim 1, characterized in that: The non-adhesive isolation surface disposed on the first molding surface and the second molding surface is an isolation film.

7. The composite material twist strip forming device according to claim 6, characterized in that: The area of ​​the isolation film is greater than or equal to the area of ​​the first joint surface and the area of ​​the second joint surface.

8. The composite material twist strip forming device according to claim 1, characterized in that: The first mold (3) and the second mold (1) are both metal parts.

9. The twist strip forming device according to any one of claims 1 to 8, characterized in that: The second mould (1) is provided with a limiting groove, the first mould (3) is provided with a limiting protrusion, the limiting protrusion abuts against the limiting groove for limiting, the bottom of the limiting groove forms the second joint surface, and the convex surface of the limiting protrusion forms the first joint surface.

Images