A composite grid shell forming die, forming device and forming method

Abstract

The present application relates to the technical fields of prepreg winding forming, and particularly relates to a composite material grid cylinder forming die, a forming device and a forming method. In order to solve the problems that the existing preparation process relies on the spindle of a machine tool, the fiber winding method is used for preparation, the whole design method is used for the silica gel soft film, and the outside does not have the silica gel soft film matched therewith, and the grid type designability is poor, in the forming device, the spindle is arranged on the support positions of two supports, one end of the spindle is connected with a rotating handle, two support discs are symmetrically arranged on the spindle, the side wall of the disc is a stepped structure composed of a large disc and a small disc, each end of a split type bottom plate is sleeved outside the small disc of one disc, each screw is screwed with a threaded hole after passing through one through hole of each end of the split type bottom plate, a cylinder soft film is sleeved outside the split type bottom plate, and each soft film B is arranged corresponding to one soft film A. The silica gel soft film increases the designability and replaceability of the grid structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prepreg winding forming, in particular to a composite material grid cylinder forming die, a forming device and a forming method. BACKGROUND

[0002] Carbon fiber composite material has performance advantages such as light weight and high strength, and is widely used in aerospace load-bearing structure field. In order to further reduce the structure weight under the condition of ensuring the strength and load-bearing performance, more and more skinless composite material grid cylinder structures are directly used as main load-bearing structures.

[0003] In the prior art, a fiber winding process combined with a metal die is generally used for preparation. The preparation process requires a heavy die, and the processing and assembly are difficult. For small composite material grid load-bearing cylinders, the existing preparation process relies on a machine tool spindle, and a fiber winding method is used for preparation. The silica gel soft film adopts an integral design method, and there is no silica gel soft film matched with the outside. The grid type has poor designability. SUMMARY

[0004] The purpose of the present application is to solve the problem that the existing preparation process relies on a machine tool spindle, uses a fiber winding method for preparation, the silica gel soft film adopts an integral design method, and there is no silica gel soft film matched with the outside. The grid type has poor designability. The present application provides a composite material grid cylinder forming die, a forming device and a forming method.

[0005] The present application is implemented by the following scheme:

[0006] A composite material grid cylinder forming die, comprising a die A or a die B;

[0007] The upper part of the die A is provided with a groove along the length thereof, and the groove bottom is provided with a fold line-shaped hollow portion arranged along the length direction of the die A; the middle part of the groove bottom is provided with a straight line-shaped hollow portion arranged along the length direction of the die A;

[0008] The inside of the die B is provided with a cavity arranged along the length direction thereof, and the top of the cavity is provided with a framework corresponding to the fold line-shaped hollow portion and the straight line-shaped hollow portion. The die B is provided with a plurality of fixed pins horizontally inserted into the middle part of the die B along the length direction thereof, and the fixed pins are detachably connected with the die B.

[0009] Further, one end of the die A is provided with a positioning end one, and one end of the die B is provided with a positioning end two, and the positioning end one and the positioning end two are correspondingly arranged.

[0010] A forming device, comprising a split type bottom plate, a spindle, a rotating handle, two supporting discs, two supports, a plurality of screws, a plurality of soft films A made of the die A and a plurality of soft films B made of the die B.

[0011] The top of each support is provided with a semicircular annular support position, the main shaft is arranged on the support positions of the two supports, one end of the main shaft is connected with the rotating handle, two support discs are symmetrically arranged on the main shaft, and the two support discs are arranged between the two supports. The side wall of the disc is a stepped structure formed by a large disc and a small disc, a plurality of threaded holes are distributed in the small disc of the disc side wall in the circumferential direction, the split bottom plate is in a cylindrical shape, each end of the split bottom plate is sleeved outside the small disc of one disc, each end of the split bottom plate is provided with a plurality of through holes, each through hole is correspondingly arranged with a threaded hole, each screw is screwed with a threaded hole through a through hole, a plurality of soft films B made of the mold B are enclosed to form a ring, and the plurality of soft films B enclosed to form a ring are arranged outside the split bottom plate to form a soft film. The soft film is used for winding the prepreg, and each soft film A made of the mold A is sleeved outside the soft film B corresponding to the soft film B.

[0012] Further, the main shaft and the support disc are connected through a key.

[0013] Further, the main shaft and the rotating handle are connected through a thread.

[0014] Further, the outer wall of the split bottom plate is provided with an anti-skid line.

[0015] Further, the soft film A and the soft film B are made of silica gel material.

[0016] Further, the side of the soft film passes through a plurality of fixing rods in the axial direction, the soft film B is removed from the mold B to leave a positioning hole formed by a fixing sign, and each fixing rod passes through the positioning holes of a plurality of molds to complete positioning.

[0017] A molding method,

[0018] It comprises the following steps:

[0019] S, a plurality of soft films A are prepared by using the mold A, and a plurality of soft films B are prepared by using the mold B;

[0020] S, a plurality of soft films B are sequentially arranged outside the split bottom plate along the axial direction of the split bottom plate, each soft film B is wound into a ring, a plurality of soft films B form a soft film, and a plurality of fastening rods pass through the cylindrical soft film along the axial direction of the split bottom plate;

[0021] S, the prepreg is laid according to the grooves of the plurality of soft films B, and one end of the prepreg is fixed on the soft film B when laying, and the rotating handle is rotated to wind the prepreg on the soft film B along the groove of the soft film B;

[0022] S, each soft film A is installed on one soft film B corresponding to the soft film B.

[0023] S, remove the main shaft, rotating handle and two supports, the remaining part into a vacuum sealed bag, vacuum, move into the heat box for curing or into the autoclave for hot pressing molding;

[0024] S, the device after molding, remove the prepreg made of composite grid cylinder, finally to the edge and intersection of the composite grid cylinder polishing, can get the complete composite grid cylinder structure.

[0025] Further, in the process of S5, the curing process needs to adjust the temperature, the temperature setting is divided into a one-time heating stage, a one-time pressure stage, a secondary heating stage, a secondary pressure stage and the last cooling stage.

[0026] Beneficial effects:

[0027] 1. The composite grid cylinder forming mold of the application can be applied to the forming of small composite grid cylinder structure parts, and has the characteristics of low manufacturing cost, small demolding damage, convenient mold assembly and strong designability of the grid.

[0028] 2. The silicone soft film of the application is suitable for the preparation of different types of grids. By designing different silicone soft film molds, different types of silicone soft films such as triangle, quadrilateral and hexagon can be obtained through splicing.

[0029] 3. The split type silicone soft film of the application adopts high thermal expansion coefficient silicone rubber, which is beneficial to the demolding of the component and has good forming quality. The bottom position has an opening, and the fastening rod passes through the opening to make the connection of different silicone soft films more firm. The lowermost part of the silicone soft film can be designed as a bottom surface with regular concave-convex form, which is matched with the split type bottom plate.

[0030] 4. The silicone soft film molds 9 and 10 of the application are used in combination with the bottom plate mold, which has regular concave-convex surfaces and is used together with the longitudinal rod. The longitudinal rod is used to prepare the opening structure at the bottom of the silicone soft film, which is used in combination with the fastening rod to improve the firmness of the silicone soft film structure and prevent relative slipping. Figure 2 As shown in the drawings, the end of the silicone soft film mold has a regular round protruding buckle structure, which is matched with the buckle structure with recess on the left side to enhance the firmness of the overall structure of the silicone soft film. Figure 2

[0031] The application can be applied to the winding type composite grid cylinder structure part, and has good forming quality, high manufacturing efficiency and low manufacturing cost. The use of silicone soft film increases the designability and replaceability of the grid structure. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 ​Schematic diagram of mold A of the present application Figure 1 ;

[0033] Figure 2 Schematic diagram of mold A of the present application Figure 2 ;

[0034] Figure 3 Partial enlarged schematic view of Figure 2 ;

[0035] Figure 4 Schematic diagram of mold B of the present application Figure 1 ;

[0036] Figure 5 Schematic diagram of mold B of the present application Figure 2 ;

[0037] Figure 6 Partial enlarged schematic view of Figure 5 ;

[0038] Figure 7 Schematic diagram of the molding device of the present application:

[0039] Figure 8 Exploded view of the molding device of the present application

[0040] Figure 9 Schematic diagram of the composite grid shell of the present application. DETAILED DESCRIPTION

[0041] Embodiment one: a composite grid shell molding mold, comprising mold A 9 or mold B 10;

[0042] The upper part of mold A 9 is provided with a groove along its length, and the bottom of the groove is provided with a zigzag hollow along the length direction of mold A 9; the middle part of the groove bottom is provided with a straight line hollow along the length direction of mold A 9;

[0043] The inside of mold B 9 is provided with a cavity along its length direction, and the top of the cavity is provided with a skeleton corresponding to the zigzag hollow and the straight line hollow; mold B 9 is provided with a plurality of fixed pins horizontally inserted in the middle part of mold B 9 along its length direction, and the fixed pins are detachably connected with mold B 9.

[0044] In this embodiment: using mold A can prepare soft film A, using mold B can prepare soft film B, further, the width and thickness of the groove and the convex part in the silica gel soft film preparation mold are determined according to the design requirement, and the thickness is designed to be larger at the intersection of the groove part and the convex part, so as to ensure that the prepreg can be smoothly laid and better matched with the silica gel soft film at the intersection.

[0045] Specific implementation method two: a composite material grid cylinder forming die, one end of the die A9 is provided with a positioning end one, one end of the die B10 is provided with a positioning end two, and the positioning end one and the positioning end two are correspondingly arranged.

[0046] In the embodiment, the positioning end one of the die A and the positioning end two of the die B are used for stripping.

[0047] Other embodiments are the same as the specific implementation method one.

[0048] Specific implementation method three: a forming device using a forming die, the forming device comprises a split base plate 3, a main shaft 4, a rotating handle 5, two support discs 2, two supports 6, a plurality of screws 7, a plurality of soft films A made of the die A9, and a plurality of soft films B made of the die B10.

[0049] The top of each support 6 is provided with a semicircular annular support position, the main shaft 4 is arranged on the support positions of the two supports 6, one end of the main shaft 4 is connected with the rotating handle 5, the two support discs 2 are symmetrically arranged on the main shaft 4, and the two support discs 2 are arranged between the two supports 6. The side wall of the disc 2 is a stepped structure composed of a large disc and a small disc, a plurality of threaded holes are distributed in the small disc of the disc 2 in the circumferential direction, the split base plate 3 is in a cylindrical shape, each end of the split base plate 3 is sleeved outside the small disc of one disc 2, each end of the split base plate 3 is provided with a plurality of through holes, each through hole is correspondingly arranged with a threaded hole, each screw 7 is screwed with a threaded hole after passing through a through hole, a plurality of soft films B made of the die B10 are respectively enclosed into a ring shape, a plurality of soft films B enclosed into a ring shape are arranged outside the split base plate 3 to form a soft film 1, and the grooves distributed on the soft film 1 are used for winding the prepreg. Each soft film A made of the die A9 is correspondingly arranged outside the soft film B.

[0050] In the embodiment, the support is used for supporting the structure composed of the split base plate, the main shaft, the rotating handle and the two support discs, the cylinder-shaped soft film is arranged outside the split base plate, and the assembly of the whole device is completed. The prepreg tape is wound through the groove part of the cylinder-shaped soft film, the screw provides the turning direction of the prepreg tape, and the prepreg tape is laid after being laid. The silica gel soft film B is combined with the silica gel soft film A.

[0051] Specific implementation method four: a forming device using a forming die, the main shaft 4 and the support disc 2 are connected through a key.

[0052] In the embodiment, the above-mentioned method is connected through a key, which is simple and stable.

[0053] Other embodiments are the same as the specific implementation method three.

[0054] Specific embodiment five: a molding device using a molding mold, the main shaft 4 and the rotating handle 5 are connected by threads.

[0055] In this embodiment: the above-mentioned mode is simple and stable.

[0056] Other embodiments are the same as specific embodiment three.

[0057] Specific embodiment six: a molding device using a molding mold, the outer wall of the split base plate 3 is provided with anti-skid lines.

[0058] In this embodiment: the anti-skid lines of the split base plate are used to prevent the soft film from moving, and the anti-skid lines of the split base plate can be designed as regular concave-convex structures corresponding to the soft film, which helps to stabilize the connection between the soft film and the split base plate structure and prevent relative slipping.

[0059] Other embodiments are the same as specific embodiment three.

[0060] Specific embodiment seven: a molding device using a molding mold, the soft film A and the soft film B are both made of silica gel material.

[0061] Other embodiments are the same as specific embodiment three.

[0062] Specific embodiment eight: a molding device using a molding mold, the side of the soft film 1 is provided with a plurality of fixed rods 8 along the axis direction, and the soft film B is provided with a positioning hole formed by a fixed sign after being removed from the mold B9, and each fixed rod 8 passes through a plurality of positioning holes of the mold to complete positioning.

[0063] In this embodiment: the fixed rods are used to connect multiple soft films B along the positioning holes to make soft films, which can be quickly connected in series by simply placing multiple soft films B in different positions.

[0064] Other embodiments are the same as specific embodiment three.

[0065] Specific embodiment nine: a molding method using a molding device, which comprises the following steps:

[0066] S1, a plurality of soft films A are prepared by using mold A9, and a plurality of soft films B are prepared by using mold B10;

[0067] S2, along the axis direction of the split base plate 3, a plurality of soft films B are sequentially arranged on the outside of the split base plate 3, each soft film B is wound into a ring shape, a plurality of soft films B form a soft film 1, and a plurality of fastening rods 8 pass through the soft film 1 along the axis direction of the split base plate 3;

[0068] S3, the prepreg is laid according to the grooves of the soft film B, and when laying, one end of the prepreg is first fixed on the soft film B, and the rotating handle 5 is rotated to make the prepreg wrap around the soft film B along the groove of the soft film B and be arranged on the soft film B;

[0069] S4, each soft film A is installed on a soft film B corresponding to the soft film B;

[0070] S5, the main shaft 4, the rotating handle 5 and the two supports 6 are removed, the remaining part is put into a vacuum sealed bag, vacuumized, and then moved into a hot box for curing and forming or moved into a hot pressing tank for hot pressing and forming;

[0071] S6, the formed device is taken out, the composite grid cylinder made of prepreg is removed, and finally the edges and intersections of the composite grid cylinder are polished to obtain a complete composite grid cylinder structure.

[0072] In the embodiment, the main shaft, the rotating handle and the support are removed, the remaining part is wrapped with a vacuum bag, and then moved into a hot pressing tank for hot pressing and forming; after forming, the soft film B and the soft film A are removed, the screws, the support disc and the split bottom plate are removed, the composite grid cylinder is demolded on the silica gel soft film A, and finally the edges and intersections are polished to obtain a complete composite grid cylinder structure.

[0073] Specific implementation ten: a forming method using the forming device,

[0074] In the process of S5, the curing process needs to adjust the temperature, and the temperature setting includes a first temperature rising stage, a first pressure increasing stage, a second temperature rising stage, a second pressure increasing stage and a final temperature decreasing stage.

[0075] In the embodiment, the above temperature is determined according to actual needs.

[0076] Other embodiments are the same as specific implementation nine.

[0077] Embodiment:

[0078] The remaining part is moved into the autoclave and hot-pressed, including: after the prepreg is laid, the prepreg, silica gel soft film, split bottom plate, support disc, screw and main shaft are put into a vacuum bag together for sealing, and whether the air tightness of the vacuum bag is good is checked; after being put into the autoclave, the parameters of hot-pressing and curing are determined according to the properties of the prepreg material used; taking carbon fiber epoxy resin matrix composite T300 as an example, the temperature setting in the curing process is divided into a first heating stage, a first pressing stage, a second heating stage, a second pressing stage and a final cooling stage; wherein the target temperature of the first heating stage is 80 DEG C, the target pressure of the first pressing stage is 0.1 MPa, the target temperature of the second heating stage is 130 DEG C, the target pressure of the second pressing stage is 0.3 MPa, the target temperature of the cooling stage is 80 DEG C, the heating rate is 2 DEG C / min, the first pressing holding time is 30 min, and the second pressing holding time is 90 min.

Claims

1. A molding method using a molding device, the molding device comprising a split base plate (3), a main shaft (4), a rotating handle (5), two support discs (2), two supports (6), a plurality of screws (7), a plurality of soft films A made of a mold A (9), and a plurality of soft films B made of a mold B (10); a half-circular annular support position is arranged on the top of each support (6), the main shaft (4) is arranged on the support positions of the two supports (6), one end of the main shaft (4) is connected with the rotating handle (5), the two support discs (2) are symmetrically arranged on the main shaft (4), and the two support discs (2) are arranged between the two supports (6); the side wall of the disc (2) is a stepped structure composed of a large disc and a small disc, a plurality of threaded holes are arranged on the small disc of the side wall of the disc (2) in the circumferential direction, the split base plate (3) is in the shape of a cylinder, each end of the split base plate (3) is sleeved outside the small disc of one disc (2), each end of the split base plate (3) is provided with a plurality of through holes, each through hole is correspondingly arranged with one threaded hole, each screw (7) is screwed with one threaded hole after passing through one through hole, a plurality of soft films B made of the mold B (10) are enclosed into a ring shape, respectively, a plurality of soft films B enclosed into a ring shape are arranged outside the split base plate (3) to form a soft film (1), and the grooves arranged on the soft film (1) are used for winding a prepreg; each soft film A made of the mold A (9) is sleeved outside one soft film B corresponding to the soft film A. characterized in that It comprises the following steps: S1, a plurality of soft films A are prepared by using the mold A (9), and a plurality of soft films B are prepared by using the mold B (10); S2, the plurality of soft films B are sequentially arranged outside the split base plate (3) along the axis direction of the split base plate (3), each soft film B is wound into a ring shape, the plurality of soft films B form a soft film (1), and a plurality of fixing rods (8) are arranged through the cylindrical soft film (1) along the axis direction of the split base plate (3); S3, the prepreg is laid according to the grooves of the plurality of soft films B, one end of the prepreg is fixed on the soft film B when the prepreg is laid, and the rotating handle (5) is rotated to wind the prepreg on the soft film B along the groove of the soft film B; S4, each soft film A is installed on one soft film B corresponding to the soft film A; S5, the main shaft (4), the rotating handle (5) and the two supports (6) are removed, the remaining part is put into a vacuum sealing bag, vacuumized, and then moved into a heat box for curing molding or a heat pressing tank for heat pressing molding; S6, the molded device is taken out, a composite material grid cylinder made of the prepreg is removed, and finally the edges and intersections of the composite material grid cylinder are polished, so that a complete composite material grid cylinder structure is obtained.

2. The molding method according to claim 1, characterized by: In the process of S5, the curing process needs to be adjusted in terms of temperature, and the temperature setting includes a first temperature rising stage, a first pressure increasing stage, a second temperature rising stage, a second pressure increasing stage and a final temperature decreasing stage.

3. The molding method according to claim 1, characterized by: The main shaft (4) is connected with the support disc (2) through a key.

4. The molding method according to claim 1, characterized by: The main shaft (4) and the rotating handle (5) are connected through a thread.

5. The molding method according to claim 1, characterized by: Anti-skid lines are arranged on the outer wall of the split base plate (3).

6. The molding method according to claim 1, characterized by: The soft film A and the soft film B are both made of silica gel material.

7. The molding method according to claim 1, characterized in that: The side of the soft film (1) is provided with a plurality of fixed rods (8) in the axial direction, and the soft film B is provided with positioning holes formed by the fixed rods after being removed from the mold B (10). Each fixed rod (8) passes through the positioning holes of a plurality of molds to complete positioning.

8. The molding method according to claim 1, characterized by: The upper part of the mold A (9) is provided with a groove along the length of the mold A (9), and the bottom of the groove is provided with a broken line hollow along the length direction of the mold A (9). The middle part of the groove bottom is provided with a straight line hollow along the length direction of the mold A (9).

9. The molding method of claim 1 wherein: The inside of the mold B (10) is provided with a cavity along the length direction, and the top of the cavity is provided with a skeleton corresponding to the broken line hollow and the straight line hollow. The mold B (10) is provided with a plurality of fixed rods which are horizontally inserted into the middle part of the mold B (10) along the length direction. The fixed rods are detachably connected with the mold B (10).

10. The molding method of claim 1 wherein: One end of the mold A (9) is provided with a positioning end one, and one end of the mold B (10) is provided with a positioning end two. The positioning end one and the positioning end two are correspondingly arranged.

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